CN101198831A - Refrigerating unit - Google Patents

Abstract

A refrigeration device having a refrigerant circuit (20) of a vapor-compression refrigeration cycle where cooling circuit (70, 80) systems having cooling heat exchangers (72, 84), respectively, are parallelly connected to an outdoor circuit (30) having arranged in it an outdoor heat exchanger (32) and a compression mechanism (31). In at least one cooling circuit (70, 80) system, an auxiliary compressor (85) is connected in series to the cooling heat exchanger (84). In order for the refrigeration device to be able to cope with various defrost operation patterns without a defrost mechanism other than the refrigeration circuit (20), the device is provided with hot gas introduction paths (46, 89) for selectively introducing discharge gas refrigerant, discharged from the compression mechanism (31) of the outdoor circuit (30), to at least one of the cooling heat exchanger (72, 84). This enables defrost operation where a refrigeration cycle is operated using the cooling heat exchangers (72, 84) as condensers.

Description

Refrigerating plant

Technical field

[0001] the present invention relates to a kind of refrigerating plant with refrigerant loop of steam compression type refrigerating circulation, this refrigerant loop is made of the cooling circuit that has a plurality of systems of cooling heat exchanger separately that has been connected in parallel in the outdoor loop that is provided with outdoor heat converter and compressing mechanism; Particularly relate to a kind of refrigerating plant, this refrigerating plant is connected in series with cooling heat exchanger and auxiliary compressor at the cooling circuit of at least one system.

Background technology

[0002] refrigerating plant one that carries out kind of refrigeration cycle is utilized as the freezer of foodstuff storing etc. and the cooling machine of freezer (or refrigerator display case or refrigerated display case) widely to known.For example, a kind of many refrigerating plants that are used for the heat exchanger in the storehouses such as cooling refrigeration storehouse that possess are disclosed in the patent documentation 1.At this refrigerating plant, for an outdoor unit, be connected in parallel to cooling as the refrigeration heat exchanger in the refrigerator display case of freezer and the cooling as the freezing heat-exchanger in the refrigerated display case of freezer.And, in this refrigerating plant, except the compressing mechanism (main compressor) of outdoor unit, between freezing heat-exchanger and outdoor unit, be provided with auxiliary compressor.In this refrigerating plant, in a refrigerant loop, carry out the refrigeration heat exchanger is circulated as evaporimeter and with the two-stage type compression refrigeration of auxiliary compressor as stage compressor as the single-stage kind of refrigeration cycle of evaporimeter and with freezing heat-exchanger.

[0003] refrigerating plant in this class has a problem to be: in case airborne attachment of moisture when refrigeration heat exchanger or freezing heat-exchanger, accompanying frost will hinder the cooling of air in the storehouse.Therefore, the frost that must will adhere to is melted, and just must carry out the defrosting of freezing heat-exchanger.

[0004] here, refrigerating plant at patent documentation 1, owing to set for the evaporating temperature of cold-producing medium lower at freezing heat-exchanger, therefore at the frosting problem especially severe of this freezing heat-exchanger, and according to the order of the expansion valve of auxiliary compressor, freezing heat-exchanger, refrigeration heat exchanger and refrigeration heat exchanger, make the kind of refrigeration cycle of cold-producing medium circulation, come freezing heat-exchanger is defrosted.

[0005] therefore, be provided with the switching mechanism of second action that can change first action of cooling off running and the running that defrosts at the refrigerant loop of above-mentioned refrigerating plant; First action of cooling off running is the suction side that auxiliary compressor is ejected into cold-producing medium from freezing heat-exchanger suction cold-producing medium the compressing mechanism of outdoor unit; It is that auxiliary compressor sucks cold-producing medium and cold-producing medium is ejected into freezing heat-exchanger from the refrigeration heat exchanger that second of the running that defrosts is moved.

[0006] and, in the defrosting running to the defrosting of above-mentioned freezing heat-exchanger, carry out second action at above-mentioned refrigerant loop and from freezing heat-exchanger cold-producing medium delivered to the refrigeration heat exchanger simultaneously.In this defrosting running, cold-producing medium is inhaled into auxiliary compressor after the air heat absorption evaporation at the refrigeration heat exchanger in the storehouse of refrigerator display case, is sent to freezing heat-exchanger after auxiliary compressor is compressed.Cold-producing medium condenses in this freezing heat-exchanger heat release frost is melted.The cold-producing medium that condenses expands according to expansion valve in front of the heat exchanger in refrigeration, gets back to the air heat absorption and evaporating in the storehouse of refrigeration heat exchanger thereafter.Like this, at above-mentioned refrigerating plant, when cold-producing medium flowed into auxiliary compressor, freezing heat-exchanger, expansion valve and refrigeration heat exchanger in regular turn, the heat of utilizing cold-producing medium air in the storehouse of refrigerator display case to reclaim came freezing heat-exchanger is defrosted.

[patent documentation 1] TOHKEMY 2004-353995 communique

Summary of the invention

Solve problem

[0007] still, in the above-mentioned refrigerating plant, freeze and accompanying frost when having hindered in the storehouse cooling of air at the refrigeration heat exchanger, can come defrost with the heat of cold-producing medium to the refrigeration heat exchanger when airborne attachment of moisture.Therefore, in the above-mentioned refrigerating plant,, the defrost mechanism of special-purpose electric heater etc. must be set beyond the refrigerant loop, and make the structure of device become complicated in order to defrost to the refrigeration heat exchanger.

[0008] and, in the above-mentioned refrigerating plant, because will refrigerate heat exchanger defrosts to freezing heat-exchanger as thermal source, must make that refrigeration heat exchanger and freezing heat-exchanger absorb heat and balance is obtained in heat radiation when the defrosting running, therefore also produced the problem of limit design.

[0009] the present invention is that its purpose is because above-mentioned every problem is thought deeply out: outside refrigerant loop other defrost mechanisms are not set in addition and can be corresponding diversified defrosting running form defrosts and can not cause restriction to the design of these heat exchangers refrigerating cooling heat exchangers such as heat exchanger or freezing heat-exchanger simultaneously.

Solution

[0010] first invention is a prerequisite with following refrigerating plant, this refrigerating plant: possessed the refrigerant loop (20) that carries out the steam compression type refrigerating circulation, this refrigerant loop (20) is to have cooling heat exchanger (72 respectively by being connected in parallel in the outdoor loop (30) that is provided with outdoor heat converter (32) and compressing mechanism (31), the cooling circuit (70 of a plurality of systems 84), 80) constitute, in the cooling circuit (80) of at least one system, auxiliary compressor (85) and cooling heat exchanger (84) are connected in series.

[0011] and, this refrigerating plant has possessed hot gas and has imported path (46,89) (100,102), this hot gas imports path (46,89) (100,102) the ejection gas refrigerant of the compressing mechanism (31) of outdoor loop (30) is optionally imported in many cooling heat exchangers (72,84) at least one, and possessed the defrosting path (25) of the running of can defrosting, this defrosting path (25) is carried out kind of refrigeration cycle with above-mentioned cooling heat exchanger (72,84) as condenser.

In [0012] first invention, carry out following action during the defrosting running:, the high temperature refrigerant that the compressing mechanism (31) of outdoor loop (30) is sprayed imports path (46 by hot gas, 89) (100,102) import to many cooling heat exchangers (72,84) at least one, and this cooling heat exchanger (72,84) is carried out kind of refrigeration cycle as condenser.Therefore, melt attached to the frost on the cooling heat exchanger (72,84) with heat that heat exchanger absorbed that at this moment becomes evaporimeter and heat at above-mentioned compressor structure (31) compressed refrigerant.This running that defrosts imports path (46,89) (100,102) and can select cooling heat exchanger to be carried out by being provided with hot gas.

Being characterized as of [0013] second invention: in first invention, be connected in parallel to first cooling circuit (70) and second cooling circuit (80) in outdoor loop (30), first cooling circuit (70) possesses first cooling heat exchanger (72), and second cooling circuit (80) possesses second cooling heat exchanger (84) and auxiliary compressor (85).First cooling circuit (70) for example can be as the cooling refrigeration circuit of freezer or refrigerator display case, and second cooling circuit for example can be as the cooling refrigerating circuit of freezer or refrigerated display case.

In [0014] second invention, in refrigerating plant with first cooling heat exchanger (72) and second cooling heat exchanger (84), by using hot gas to import path (46,89), can carry out in first cooling heat exchanger (72) and second cooling heat exchanger (84) one of them as the kind of refrigeration cycle of condenser and the running that defrosts.For example can be only to the wherein running that defrosts in first cooling heat exchanger (72) and second cooling heat exchanger (84), or to first cooling heat exchanger (72) and second cooling heat exchanger (84) the both sides running that defrosts simultaneously.

Being characterized as of [0015] the 3rd invention: in first invention, be connected in parallel to a plurality of cooling circuits (80) of possess cooling heat exchanger (84) and auxiliary compressor (85) in outdoor loop (30).

In [0016] the 3rd invention, in refrigerating plant with many cooling heat exchangers (84), by using hot gas to import path (46,89), can carry out with at least one in many cooling heat exchangers (84) as the kind of refrigeration cycle of condenser and the running that defrosts.For example, when cooling heat exchanger (84) is two, can be only to the wherein running that defrosts in the cooling heat exchanger (84), or to two cooling heat exchangers (84) both sides running that defrosts simultaneously.

Being characterized as of [0017] the 4th invention: in arbitrary invention of first to the 3rd invention, be connected with the air heat exchanger loop (for example air conditioner loop) (60) of the air heat exchanger (for example heat exchanger of air condition) (62) that has possessed the adjusting air themperature in outdoor loop (30), can carry out the first defrosting running and the second defrosting running and constitute, the first defrosting running is with cooling heat exchanger (72,84) be evaporimeter for condenser with air heat exchanger (62), the second defrosting running is a condenser with cooling heat exchanger (72,84), and be evaporimeter with outdoor heat converter (32).

In [0018] the 4th invention, possessing many cooling heat exchangers (72,84) and in the refrigerating plant of air heat exchanger (62), by using hot gas to import path (46,89), can be according to the running that defrosts with at least one kind of refrigeration cycle in many cooling heat exchangers (72,84) as condenser.Specifically, can carry out the first defrosting running and the second defrosting running, the first defrosting running is with cooling heat exchanger (72,84) at least one in is evaporimeter for condenser with air heat exchanger (62), the second defrosting running is evaporimeter for condenser with outdoor heat converter (32) with at least one in the cooling heat exchanger (72,84)

Being characterized as of [0019] the 5th invention: arbitrary invention of from first to the 4th invention, hot gas imports path (46,89) and has possessed senior side hot gas path (46) and rudimentary side hot gas path (89); Bleed pipe (45) and each cooling circuit (70 of the compressing mechanism (31) of senior side hot gas path (46) junction chamber external loop (30), the parent tube (42) of low pressure tracheae 80), when the defrosting running, allow cold-producing medium to flow to each cooling heat exchanger (72,84) from the bleed pipe (45) of above-mentioned compressor structure (31); The bleed pipe (22b) of rudimentary side hot gas path (89) auxiliary connection compressor (85) and suction line (88) allow cold-producing medium to flow to the cooling heat exchanger (84) that connects this auxiliary compressor (85) from the bleed pipe (22b) of auxiliary compressor (85) when the defrosting running.

In [0020] the 5th invention, during the defrosting running, the ejection gas refrigerant that is sprayed from the compressing mechanism (31) of outdoor loop (30), at first pass through each cooling circuit (70 from senior side hot gas path (46), the parent tube (42) of low pressure tracheae 80) and flow to each cooling heat exchanger (72,84).Then, for example first cooling circuit (such as refrigeration circuit) (70) of auxiliary compressor (85) is being set not, above-mentioned ejection gas refrigerant flows into first cooling heat exchanger (for example refrigerating heat exchanger) (72), and this heat exchanger is brought into play function as condenser.And, be provided with second cooling circuit (such as refrigerating circuit) (80) of auxiliary compressor (85), above-mentioned ejection gas refrigerant flows into second cooling heat exchanger (such as freezing heat-exchanger) (84) by rudimentary side hot gas path (89), and this heat exchanger is brought into play function as condenser.

[0021] and, optionally import each cooling heat exchanger (72,84) by spraying gas refrigerant, the accompanying frost of at least one cooling heat exchanger (72,84) is melted.For example, in the structure of second invention, can be only to the wherein running that defrosts in first cooling heat exchanger (72) and second cooling heat exchanger (84), or to first cooling heat exchanger (72) and second cooling heat exchanger (84) the both sides running that defrosts simultaneously; In the structure of the 3rd invention, cooling heat exchanger (84) is under two the situation, can be only to wherein running that defrosts of this cooling heat exchanger (84), or to the both sides of two cooling heat exchangers (84) running that defrosts simultaneously.At this moment, the cooling heat exchanger (84) in that auxiliary compressor (85) connects owing to do not import the ejection gas refrigerant of rudimentary side hot gas path (89), therefore can not make cooling heat exchanger (84) become defrost state.

Being characterized as of [0022] the 6th invention: in the 5th invention, possessed as the compressing mechanism (31) of outdoor loop (30) and first compressor (31a), second compressor (32b) and the 3rd compressor (31c) that are connected in parallel, the four-way change-over valve (37) that connects the suction side of above-mentioned compressor structure (31), be located at the senior side switch valve (SV1) of senior side hot gas path (46), and the rudimentary side switch valve (SV2) of being located at rudimentary side hot gas path (89); The suction line (41a) of first compressor (31a) is by first valve port (P1) of non-return valve (CV1) connection four-way change-over valve (37), and above-mentioned non-return valve (CV1) is forbidden this first compressor (31a) of refrigerant flow direction; The suction line (41b) of second compressor (32b) connects second valve port (P2) of four-way change-over valve (37); The suction line (41c) of the 3rd compressor (31c) is by the 3rd valve port (P3) of non-return valve (CV2) connection four-way change-over valve (37), and above-mentioned non-return valve (CV2) is forbidden refrigerant flow direction the 3rd compressor (31c); The high pressure ingress pipe (47) that is communicated with the high-voltage tube of compressing mechanism (31) connects the 4th valve port (P4) of four-way change-over valve (37); Senior side hot gas path (46) connects the suction line (41a) of first compressor (31a); Four-way change-over valve (37) structurally can convert first state and second state to, first state is communicated with the 3rd valve port (P3) and the 4th valve port (P4) simultaneously for being communicated with first valve port (P1) and second valve port (P2), and second state is communicated with second valve port (P2) and the 3rd valve port (P3) simultaneously for being communicated with first valve port (P1) and the 4th valve port (P4).

In [0023] the 6th invention, during the defrosting running, four-way change-over valve (37) is configured to second state, opens senior side switch valve (SV1) and rudimentary side switch valve (SV2), and starts second compressor (31b) of compressing mechanism (31) and two on the 3rd compressor (31c) or wherein one.In this state, the ejection gas refrigerant that is sprayed from compressing mechanism (31) at first flows to each cooling heat exchanger (72,84) from the parent tube (42) of senior side hot gas path (46) by the low pressure tracheae of each cooling circuit (70,80).Then, for example first cooling circuit (such as refrigeration circuit) (70) of auxiliary compressor (85) is being set not, above-mentioned ejection gas refrigerant flow into first cooling heat exchanger (for example refrigerating heat exchanger) (72), and this heat exchanger is brought into play function as condenser.And, be provided with second cooling circuit (such as refrigerating circuit) (80) of auxiliary compressor (85), above-mentioned ejection gas refrigerant flow into second cooling heat exchanger (such as freezing heat-exchanger) (84) by rudimentary side hot gas path (89), and this heat exchanger is brought into play function as condenser.

[0024] and, optionally import each cooling heat exchanger (72,84) by spraying gas refrigerant, accompanying frost at least one the cooling heat exchanger (72,84) is melted.For example, in the structure of second invention, can be only to the wherein running that defrosts in first cooling heat exchanger (72) and second cooling heat exchanger (84), or to the both sides of first cooling heat exchanger (72) and second cooling heat exchanger (84) running that defrosts simultaneously; In the structure of the 3rd invention, when cooling heat exchanger (84) is two a situation, can be only to wherein running that defrosts of this cooling heat exchanger (84), or to the both sides of two cooling heat exchangers (84) running that defrosts simultaneously.At this moment, in the cooling heat exchanger that is connected with auxiliary compressor (85) (84), will not spray gas refrigerant owing to closed rudimentary side switch valve (SV2) and import rudimentary side hot gas path (89), and therefore can make this cooling heat exchanger (84) can not become defrost state.And, at cooling heat exchanger (72,84) behind the condensation process, finish the low-pressure refrigerant gas of expansion process and evaporation process, be inhaled into second compressor (32b) and the 3rd compressor (31c) by suction line (41b) and suction line (41c) from four-way change-over valve (37).

Being characterized as of [0025] the 7th invention: in the 5th invention, possessed as the compressing mechanism (31) of outdoor loop (30) and first compressor (31a), second compressor (32b) and the 3rd compressor (31c) that are connected in parallel, connect the four-way change-over valve (37) of the suction side of this compressing mechanism (31), and the rudimentary side switch valve (SV2) that is set at rudimentary side hot gas path (89); The suction line (41a) of first compressor (31a) connects first valve port (P1) of four-way change-over valve (37); The suction line (41b) of second compressor (32b) connects second valve port (P2) of four-way change-over valve (37); The suction line (41c) of the 3rd compressor (31c) is by the 3rd valve port (P3) of non-return valve (CV2) connection four-way change-over valve (37), and above-mentioned non-return valve (CV2) is forbidden refrigerant flow direction the 3rd compressor (31c); Senior side hot gas path (46) connects the 4th valve port (P4) of four-way change-over valve (37); Four-way change-over valve (37) structurally can convert first state and second state to, first state is communicated with second valve port (P2) and the 3rd valve port (P3) simultaneously for being communicated with first valve port (P1) and the 4th valve port (P4), and second state is communicated with the 3rd valve port (P3) and the 4th valve port (P4) simultaneously for being communicated with first valve port (P1) and second valve port (P2).

In [0026] the 7th invention, during the defrosting running, four-way change-over valve (37) is configured to second state, opens rudimentary side switch valve (SV2), and starts second compressor (31b) of compressing mechanism (31) and two or wherein of the 3rd compressor (31c).In this state, the ejection gas refrigerant that is sprayed from compressing mechanism (31), at first flow to each cooling heat exchanger (72,84) from senior side hot gas path (46) and four-way change-over valve (37) parent tube (42) by the low pressure tracheae of each cooling circuit (70,80).Then, for example be not provided with first cooling circuit (such as refrigeration circuit) (70) of auxiliary compressor (85), above-mentioned ejection gas refrigerant flow into first cooling heat exchanger (for example refrigerating heat exchanger) (72), and this heat exchanger is brought into play function as condenser.And, be provided with second cooling circuit (such as refrigerating circuit) (80) of auxiliary compressor (85), above-mentioned ejection gas refrigerant flow into second cooling heat exchanger (such as freezing heat-exchanger) (84) by rudimentary side hot gas path (89), and this heat exchanger is brought into play function as condenser.

[0027] and, will spray gas refrigerant and optionally import each cooling heat exchanger (72,84), accompanying frost at least one the cooling heat exchanger (72,84) is melted.For example, in the structure of second invention, can be only to the wherein running that defrosts in first cooling heat exchanger (72) and second cooling heat exchanger (84), or to first cooling heat exchanger (72) and second cooling heat exchanger (84) the both sides running that defrosts simultaneously; In the structure of the 3rd invention, when cooling heat exchanger (84) is two a situation, can be only to the wherein running that defrosts in this cooling heat exchanger (84), or to these two cooling heat exchangers (84) both sides running that defrosts simultaneously.At this moment, in the cooling heat exchanger that is connected with auxiliary compressor (85) (84), will not spray gas refrigerant owing to close rudimentary side switch valve (SV2) and import rudimentary side hot gas path (89), and therefore can make this cooling heat exchanger (84) can not become defrost state.And, at cooling heat exchanger (72,84) behind the condensation process, finish the low-pressure refrigerant gas of expansion process and evaporation process, be inhaled into second compressor (32b) and the 3rd compressor (31c) by suction line (41b) and suction line (41c) from four-way change-over valve (37).

Being characterized as of [0028] the 8th invention: in first invention, hot gas imports path (46,89) and possesses the first importing path (96) and the second importing path (97); First imports path (96) makes the ejection gas refrigerant of the compressing mechanism (31) of outdoor loop (30) import auxiliary compressor (85); Second imports path (97) makes the ejection gas refrigerant of auxiliary compressor (85) import cooling heat exchanger (84).

In [0029] the 8th invention, the ejection gas refrigerant of the compressing mechanism (31) in outdoor loop (30) is imported into auxiliary compressor (85) by the first importing path (96) and further is compressed, thereafter, the ejection gas refrigerant of auxiliary compressor (85) imports path (97) by second and is imported into the defrosting that cooling heat exchanger (84) is used in this cooling heat exchanger (84).As mentioned above, defrosting when running of this 8th invention, with compressing mechanism (31) and auxiliary compressor (85) both sides of outdoor loop (30) cold-producing medium is compressed, therefore increased the heat that cold-producing medium was given when defrosting was turned round.

Being characterized as of [0030] the 9th invention: in the 8th invention, second imports the compressing mechanism (31) and the cooling heat exchanger (84) of path (97) junction chamber external loop (30); And first imports path (96) imports the part importing auxiliary compressor (85) that path (97) divides inconsistent auxiliary connection compressor (85) to make the gas refrigerant that the compressing mechanism (31) of outdoor loop (30) is sprayed from second; Be connected with the bleed pipe (98) of auxiliary compressor (85) in above-mentioned second side of compressing mechanism (31) that imports the outdoor loop (30) of path (97).

In [0031] the 9th invention, the part of the gas refrigerant that the compressing mechanism (31) of outdoor loop (30) is sprayed is imported into auxiliary compressor (85) by the first importing path (96) and imports and further be compressed; The gas refrigerant that auxiliary compressor (85) is sprayed and flow into the second ejection gas refrigerant that imports the above-mentioned compressor structure (31) of path (97) and converge the defrosting that is directed to cooling heat exchanger (84) and is used in this cooling heat exchanger (84).As mentioned above, defrosting when running of this 9th invention, with the 8th invention substantially in the same manner owing to cold-producing medium is compressed with the compressing mechanism (31) and auxiliary compressor (85) both sides of outdoor loop (30), the heat that cold-producing medium is given when therefore, having increased the defrosting running.

Being characterized as of [0032] the tenth invention: possessed liquid and inject path (99) in the 9th invention, the part that this liquid injects the liquid refrigerant that path (99) will flow out from cooling heat exchanger (84) imports auxiliary compressor (85).

In [0033] the tenth invention, carry out becoming the action that liquid that aqueous part of refrigerant supplies with to auxiliary compressor (85) injects with condensing at cooling heat exchanger (84) in the 9th invention.As a result, compare with the situation of not carrying out the liquid injection, the excessive temperature that can suppress the ejection gas refrigerant of auxiliary compressor (85) rises.

Being characterized as of [0034] the 11 invention: auxiliary compressor (85) is made of frequency-changeable compressor in the 9th invention.

In [0035] the 11 invention, when the 9th invention defrosts running, temperature for the ejection gas refrigerant of auxiliary compressor (85) rises easily, and by the control that running capacity is reduced, the excessive temperature that can suppress the ejection gas refrigerant of auxiliary compressor (85) rises.

Being characterized as of [0036] the 12 invention: in first invention, hot gas imports path (100,102) at least one of the gas side pipe arrangement (110,112) of the bleed pipe (45) of the compressing mechanism (31) of direct junction chamber external loop (30) and cooling heat exchanger (72,84).

In [0037] the 12 invention, the high-temperature gas cold-producing medium that the compressing mechanism (31) of outdoor loop (30) is sprayed is directed in the cooling heat exchanger (72,84) at least one from gas side.Therefore, can with this cooling heat exchanger (72,84) as condenser and with other heat exchangers as the evaporimeter running that defrosts.

Being characterized as of [0038] the 13 invention: in the 12 invention, hot gas imports path (100,102) be connected with bleed pipe (45) and many cooling heat exchangers (72 of the compressing mechanism (31) of outdoor loop (30), the pipe arrangement (110 of gas side 84), 112), and this refrigerating plant has possessed the switching mechanism (103) that can change or select many cooling heat exchangers (72,84).

In [0039] the 13 invention, can change or select many cooling heat exchangers (72, the 84) running that defrosts.

Being characterized as of [0040] the 14 invention: in the 12 or the 13 invention, import path (100,102) at hot gas and be provided with flow guiding mechanism (101).

In [0041] the 14 invention, can adjust and flow through the flow that hot gas imports the high-temperature gas cold-producing medium of path (100,102).

The invention effect

[0042] according to the present invention, cooling circuit (70 in a plurality of systems that are connected in parallel mutually, the cooling circuit of at least one system 80) (80) is connected in series with in the refrigerating plant of cooling heat exchanger (84) and auxiliary compressor (85), be provided with hot gas and import path (46,89) (100,102), this hot gas imports path (46,89) (100,102) gas refrigerant that the compressing mechanism (31) of outdoor loop (30) is sprayed optionally imports many cooling heat exchangers (72,84) at least one, and carry out the defrosting running of kind of refrigeration cycle as condenser with cooling heat exchanger (72,84).Therefore, can use the heat that is absorbed at outdoor heat converter (32) to use simultaneously at above-mentioned compressor structure (31) heat that compressed refrigerant obtained, carry out cooling heat exchanger (72,84) defrosting, when being provided with the loop of idle call, the heat that is absorbed at heat exchanger of air condition (62) in the time of can using cold air is simultaneously by carrying out the defrosting to cooling heat exchanger (72,84) at above-mentioned compressor structure (31) heat that compressed refrigerant obtained.

[0043] therefore, the defrost mechanism that special use such as electric heater can be set outside refrigerant loop (20) in addition also can carry out the defrosting running of varied form, and can prevent that apparatus structure from becoming complicated.And, because being different from conventional device comes freezing heat-exchanger is defrosted as thermal source with the refrigeration heat exchanger, therefore there is no need to many cooling heat exchangers (72, must make the balanced combination of heat absorption and heat radiation good when 84) defrosting is turned round, therefore also improve the free degree in the design.

[0044] if according to above-mentioned second invention, because as cooling circuit, can make first cooling circuit (70) with first cooling heat exchanger (72) and have second cooling heat exchanger (84) and second cooling circuit (80) of auxiliary compressor (85) is connected in parallel to outdoor loop (30), therefore can be only to the wherein running that defrosts in first cooling heat exchanger (72) and second cooling heat exchanger (84), or to first cooling heat exchanger (72) and second cooling heat exchanger (84) the both sides running that defrosts simultaneously.Therefore, can carry out diversified defrosting running form.

[0045] if according to above-mentioned the 3rd invention, because as cooling circuit, make many refrigerating circuits (80) that possessed cooling heat exchanger (84) and auxiliary compressor (85) be connected in parallel to outdoor loop (30), therefore, when for example cooling heat exchanger (84) is two a situation, can be only to wherein running that defrosts of this cooling heat exchanger (84), or to two cooling heat exchangers (84) both sides running that defrosts simultaneously.Therefore, can carry out the form of diversified defrosting running.

[0046] if according to above-mentioned the 4th invention, for outdoor loop (30), many cooling circuits (70,80) are connected with air heat exchanger loop (60), can carry out the first defrosting running and the second defrosting running; The first defrosting running with at least one in many cooling heat exchangers (72,84) as condenser and with air heat exchanger (62) as evaporimeter; The second defrosting running with at least one in the cooling heat exchanger (72,84) as condenser and with outdoor heat converter (32) as evaporimeter; Therefore, can carry out the form that more kinds of various defrostings are turned round.

[0047] if according to above-mentioned the 5th invention, hot gas imports path (46,89) and has possessed senior side hot gas path (46) and rudimentary side hot gas path (89); Bleed pipe (45) and each cooling circuit (70 of the compressing mechanism (31) of senior side hot gas path (46) junction chamber external loop (30), the parent tube (42) of low pressure tracheae 80), allow cold-producing medium to flow to each cooling heat exchanger (72,84) during the defrosting running from the bleed pipe (45) of above-mentioned compressor structure (31); The bleed pipe (22b) of rudimentary side hot gas path (89) auxiliary connection compressor (85) and suction line (88) allow cold-producing medium to flow to the cooling heat exchanger (84) that connects this auxiliary compressor (85) from the bleed pipe (22b) of auxiliary compressor (85) during the defrosting running; Therefore when the defrosting running, the gas refrigerant that the compressing mechanism (31) from outdoor loop (30) can be sprayed optionally imports each cooling heat exchanger (72,84).And, optionally import to each cooling heat exchanger (72 by the gas refrigerant that above-mentioned compressor structure (31) is sprayed from senior side hot gas path (46) and rudimentary side hot gas path (89), 84), therefore, defrosting running that can corresponding varied form.

[0048] if according to above-mentioned the 6th invention, owing to used three compressor (31a, 31b, 31c) compressing mechanism (31) as outdoor loop (30) uses four-way change-over valve (37) simultaneously in the suction side, have many cooling heat exchangers (72,84) in the refrigerant loop (20), can not make loop structure complicated, and corresponding diversified defrosting running form.

[0049] if according to above-mentioned the 7th invention, with above-mentioned the 6th the invention in the same manner, use three compressor (31a, 31b, 31c) use four-way change-over valve (37) in the suction side, in the refrigerant loop that has possessed many cooling heat exchangers (72,84) (20) as compressing mechanism (31), the while of outdoor loop (30), can not make loop structure complicated, and can corresponding diversified defrosting running form.

[0050] if according to above-mentioned the 8th invention,, therefore improved the defrosting ability of cooling heat exchanger (84) owing to increased the heat of the cold-producing medium that gives when defrosting is turned round.Therefore, when the defrosting scarce capacity,, can defrost effectively to cooling heat exchanger (84) by carrying out control of the present invention.

[0051] if according to above-mentioned the 9th invention, with the 8th invention similarly because the heat of the cold-producing medium that gives when having increased the defrosting running, so improved the defrosting ability of cooling heat exchanger (84).Therefore, defrosting during scarce capacity by carrying out control of the present invention, the defrosting that can carry out effectively cooling heat exchanger (84).

[0052] if, carry out liquid when turning round and inject, can avoid the ejection refrigerant temperature abnormal ascending of auxiliary compressor (85), and can positively protect auxiliary compressor (85) by the defrosting of the 9th invention according to above-mentioned the tenth invention.

[0053] if according to above-mentioned the 11 invention; the running capacity of auxiliary compressor (85) in the time of can turning round by the defrosting that reduces the 9th invention; avoid the ejection refrigerant temperature abnormal ascending of auxiliary compressor (85), therefore can positively protect auxiliary compressor (85).

[0054] if according to above-mentioned the 12 invention, because hot gas imports path (100,102) bleed pipe (45) and the cooling heat exchanger (72 of the compressing mechanism (31) of direct junction chamber external loop (30), 84) gas side pipe arrangement (110,112) at least one, therefore the high-temperature gas cold-producing medium that sprayed of the compressing mechanism (31) in outdoor loop (30) is imported into the cooling heat exchanger at least one from gas side.Therefore, can be with cooling heat exchanger (72,84) as condenser and with other heat exchanger as the evaporimeter running that defrosts.

[0055] if according to above-mentioned the 13 invention, because hot gas is imported path (100,102) bleed pipe (45) of the compressing mechanism (31) of junction chamber external loop (30) and many cooling heat exchangers (72,84) many cooling heat exchangers (72 can be changed or select to gas side pipe arrangement (110,112) and be provided with, 84) switching mechanism (103), therefore, can change or select many cooling heat exchangers (72, the 84) running that defrosts.

[0056] if, import path (100,102) at hot gas and be provided with flow guiding mechanism (101), therefore can adjust and flow through the flow that hot gas imports the high-temperature gas cold-producing medium of path (100,102) according to above-mentioned the 14 invention.Here, import path (100 if flow through hot gas, the flow of gas refrigerant 102) is many, then attached to cooling heat exchanger (72,84) frost will begin at a heat to melt and may cause the white piece around it to drop, but, therefore can prevent dropping of white piece owing to make frost melt gradually by reducing flow.

Description of drawings

[0057] Fig. 1 illustrates the refrigerant loop figure of the related refrigerating plant of first embodiment.

The refrigerant loop figure of the action when Fig. 2 illustrates the related cold air operation of first embodiment.

The refrigerant loop figure of an example of defrosting running action when Fig. 3 illustrates the related cold air of first embodiment.

The refrigerant loop figure of other examples when Fig. 4 illustrates except the related cold air of first embodiment the defrosting running action.

Fig. 5 illustrates the refrigerant loop figure that moves when the related heating installation of first embodiment turns round.

The refrigerant loop figure of an example of defrosting running action when Fig. 6 illustrates the related heating installation of first embodiment.

The refrigerant loop figure of other examples when Fig. 7 illustrates except the related heating installation of first embodiment the defrosting running action.

Fig. 8 illustrates the refrigerant loop figure of the related refrigerating plant of second embodiment.

The refrigerant loop figure that Fig. 9 moves when the related cold air operation of second embodiment is shown.

The refrigerant loop figure of an example of defrosting running action when Figure 10 illustrates the related cold air of second embodiment.

The refrigerant loop figure of the example when Figure 11 illustrates the related cold air of second embodiment beyond the defrosting running action.

Figure 12 illustrates the refrigerant loop figure that moves when the related heating installation of second embodiment turns round.

The refrigerant loop figure of an example of defrosting running action when Figure 13 illustrates the related heating installation of second embodiment.

The refrigerant loop figure of example defrosting running action when Figure 14 illustrates except the related heating installation of second embodiment.

Figure 15 illustrates the refrigerant loop figure of the related refrigerating plant of the 3rd embodiment.

The refrigerant loop figure that Figure 16 moves when the related cold air operation of the 3rd embodiment is shown.

The refrigerant loop figure of an example of the defrosting running action when Figure 17 illustrates the related cold air of the 3rd embodiment.

The refrigerant loop figure of the example when Figure 18 illustrates except the related cold air of the 3rd embodiment the defrosting running action.

The refrigerant loop figure of the action when Figure 19 illustrates the running of the related heating installation of the 3rd embodiment.

The refrigerant loop figure of an example of defrosting running action when Figure 20 illustrates the related heating installation of the 3rd embodiment.

The refrigerant loop figure of the example when Figure 21 illustrates the related heating installation of the 3rd embodiment beyond the defrosting running action.

The refrigerant loop figure of an example of defrosting running action when Figure 22 illustrates the related cold air of the 4th embodiment.

Figure 23 illustrates the refrigerant loop figure of the related refrigerating plant of the 5th embodiment.

Symbol description

[0058] 10-refrigerating plant, the 20-refrigerant loop, 22b-bleed pipe (freezing side difference tracheae), the outdoor loop of 30-, the 31-compressing mechanism, 31a-DC frequency conversion compressor reducer (first compressor), the 32b-first fixed compressor reducer (second compressor) frequently, the 31c-second fixed compressor reducer (the 3rd compressor) frequently, the 32-outdoor heat converter, 37-the 3rd four-way change-over valve, 41a-first suction line (suction line), 41b-second suction line (suction line), 41c-the 3rd suction line (suction line), the 42-first low pressure tracheae (parent tube of low pressure tracheae), 45-bleed pipe (high-pressure air pipe), the senior side hot gas path of 46-(hot gas importing path), 47-high pressure ingress pipe, the 60-air conditioner loop, the 62-heat exchanger of air condition, 70-refrigeration circuit (cooling circuit), 72-refrigerates heat exchanger (cooling heat exchanger), 80-refrigerating circuit (cooling circuit), 84-freezing heat-exchanger (cooling heat exchanger), 85-auxiliary compressor (auxiliary compressor), 88-suction line (88), the rudimentary side hot gas path of 89-(hot gas importing path), the CV1-non-return valve, the CV2-non-return valve, P1-first valve port, P2-second valve port, P3-the 3rd valve port, P4-the 4th valve port, the senior side switch valve of SV1-, the rudimentary side switch valve of SV2-, the 10-refrigerating plant, the 20-refrigerant loop, 22b-bleed pipe (freezing side difference tracheae), the 25-path of defrosting, the outdoor loop of 30-, the 31-compressing mechanism, 31a-DC frequency conversion compressor reducer (first compressor), the 32b-first fixed compressor reducer (second compressor) frequently, the 31c-second fixed compressor reducer (the 3rd compressor) frequently, 32-outdoor heat converter, 37-the 3rd four-way change-over valve, 41a-first suction line (suction line), 41b-second suction line (suction line), 41c-the 3rd suction line (suction line), the 42-first low pressure tracheae (parent tube of low pressure tracheae), 45-bleed pipe (high-pressure air pipe), the senior side hot gas path of 46-(hot gas importing path), 47-high pressure ingress pipe, 60-air conditioner loop, the 62-heat exchanger of air condition, 70-refrigeration circuit (cooling circuit), 72-refrigerates heat exchanger (cooling heat exchanger), 80-refrigerating circuit (cooling circuit), 84-freezing heat-exchanger (cooling heat exchanger), 85-auxiliary compressor (auxiliary compressor), 88-suction line (88), the rudimentary side hot gas path of 89-(hot gas importing path), 96-first imports path, 97-second imports path, the 98-bleed pipe, and 99-liquid injects path, 100-hot gas imports path, 101-flow guiding mechanism, 102-branch pipe (hot gas importing path), the pipe arrangement of 110-gas side, the pipe arrangement of 112-gas side, CV1, CV2-non-return valve, P1-first valve port, P2-second valve port, P3-the 3rd valve port, P4-the 4th valve port, the senior side switch valve of SV1-, the rudimentary side switch valve of SV2-

The specific embodiment

[0059] following according to accompanying drawing, describe embodiments of the invention in detail.

[0060] " first embodiment "

The first embodiment of the present invention below is described.The refrigerating plant of present embodiment (10) is used for carrying out the air-conditioning the shop in and cooling off in the showcase for being located at convenience store etc.

[0061] as shown in Figure 1, the refrigerating plant of present embodiment (10) have outdoor unit (11), air-conditioning unit (12), as the refrigerator display case (13) of freezer and as the refrigerated display case (14) of freezer.Outdoor unit (11) is set at outdoor.On the other hand, air-conditioning unit (12), refrigerator display case (13) and refrigerated display case (14) all are to be arranged in the shops such as convenience store.

[0062] is provided with outdoor loop (30) at above-mentioned outdoor unit (11), be provided with air conditioner loop (air heat exchanger loop) (60) at air-conditioning unit (12), be provided with refrigeration circuit (first cooling circuit) (70) at refrigerator display case (13), and be provided with refrigerating circuit (second cooling circuit) (80) at refrigerated display case (14).In this refrigerating plant (10), constitute refrigerant loop (20) by connect these loops (30,60,70,80) with pipe arrangement.Refrigerant loop (20) comprises the loop of refrigerated storage/refrigerating system and the loop of air-conditioning system.

[0063], outdoor loop (30) is connected in parallel mutually as the refrigeration circuit (70) and the refrigerating circuit (80) of cooling circuit in the refrigerated storage/refrigerating system side of above-mentioned refrigerant loop (20).Specifically, refrigeration circuit (70) and refrigerating circuit (80) are by first hydraulic fluid side contact pipe arrangement (21) and first gas side contact pipe arrangement (22) junction chamber external loop (30).One end junction chamber external loop (30) of first hydraulic fluid side contact pipe arrangement (21).The other end difference of this first hydraulic fluid side contact pipe arrangement (21) is both sides, a wherein end of difference (refrigeration side difference liquid pipe (21a)) connects the liquid side of refrigeration circuit (70), and the other end (freezing side difference liquid pipe (21b)) connects the liquid side of refrigerating circuit (80).One end junction chamber external loop (30) of first gas side contact pipe arrangement (22).The other end difference of this first gas side contact pipe arrangement (22) is two, one end of difference (refrigeration side difference tracheae (22a)) connects the gas side of refrigeration circuit (70), and the other end of difference (freezing side difference tracheae (22b)) connects the gas side of refrigerating circuit (80).

[0064] and, in the air-conditioning system side of above-mentioned refrigerant loop (20), second hydraulic fluid side contact pipe arrangement (23) and second gas side contact pipe arrangement (24) the junction chamber external loop (30) of air conditioner loop (60) by coming out from first hydraulic fluid side contact pipe arrangement (21) difference.One end of second hydraulic fluid side contact pipe arrangement (23) is by first hydraulic fluid side contact pipe arrangement (21) junction chamber external loop (30), and the other end connects the liquid side of air conditioner loop (60).One end of second gas side contact pipe arrangement (24) contacts outdoor loop (30), and the other end connects the gas side of air conditioner loop (60).

[0065] " outdoor unit "

As above-mentioned, outdoor unit (11) has outdoor loop (30).Be provided with compressing mechanism (31), outdoor heat converter (32), receiver (receiver) (33) and outdoor expansion valve (34) in this outdoor loop (30).And, be provided with first four-way change-over valve (35), second four-way change-over valve (36), the 3rd four-way change-over valve (37), hydraulic fluid side draught excluder (38), the first gas side draught excluder (39a) and the second gas side draught excluder (39b) in outdoor loop (30).In this outdoor loop (30), hydraulic fluid side draught excluder (38) connects first hydraulic fluid side contact pipe arrangement (21), the first gas side draught excluder (39a) connects first gas side contact pipe arrangement (22), and the second gas side draught excluder (39b) connects second gas side contact pipe arrangement (24).

[0066] above-mentioned compressor structure (31), by by as the DC frequency conversion compressor reducer (31a) of first compressor, as the first fixed compressor reducer (31b) frequently of second compressor, as the second fixed compressor reducer (31c) frequently of the 3rd compressor be connected in parallel mutually constitute.(31a, 31b 31c), are the screw compressors of totally-enclosed type high pressure half dome type to each compressor.At DC frequency conversion compressor reducer (31a), by the frequency converter supply capability.This DC frequency conversion compressor reducer (31a) changes the rotary speed of motor by the output frequency that changes frequency converter, and can adjust running capacity.On the other hand, the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently then are the often rotary speed runnings to fix of motor, and running capacity is fixing.

[0067] is connected with an end of first suction line (41a) in the suction side of DC frequency conversion compressor reducer (31a), be connected with an end of second suction line (41b) in the first fixed suction side of compressor reducer (31b) frequently, be connected with an end of the 3rd suction line (41c) in the second fixed suction side of compressor reducer (31c) frequently.

The other end of [0068] first suction line (41a) has connected the first low pressure tracheae (42) and first communicating pipe (43a) as the low pressure tracheae parent tube of refrigerated storage/refrigerating system, and the first low pressure tracheae (42) connects the first gas side draught excluder (39a).First suction line (41a) connects first valve port (P1) of the 3rd four-way change-over valve (37) by first communicating pipe (43a).Be provided with the non-return valve (CV1) of forbidding refrigerant flow direction DC frequency conversion compressor reducer (31a) first communicating pipe (43a).Second valve port (P2) that connects the 3rd four-way change-over valve (37) at the other end of second suction line (41b).The other end of the 3rd suction line (41c) connects the second low pressure tracheae (44) and second communicating pipe (43b), and the second low pressure tracheae (44) connects second four-way change-over valve (36).The 3rd suction line (41c) connects the 3rd valve port (P3) of the 3rd four-way change-over valve (37) by second communicating pipe (43b).Be provided with the non-return valve (CV2) of forbidding the refrigerant flow direction second fixed frequency compressor reducer (31c) second communicating pipe (43b).

[0069] the ejection side at compressing mechanism (31) is connected with high-pressure air pipe (bleed pipe) (45).Be connected with an end of senior side hot gas path (46) at this high-pressure air pipe (45), the other end of senior side hot gas path (46) connects first suction line (41a).At this senior side hot gas path (46), be provided with first magnetic valve (SV1) as senior side switch valve.Bleed pipe (45) and each cooling circuit (70 of the compressing mechanism (31) of senior side hot gas path (46) junction chamber external loop (30), the first low pressure tracheae (42) of low pressure tracheae parent tube 80), allow cold-producing medium to flow to the path of each cooling heat exchanger (72,84) from the bleed pipe (45) of above-mentioned compressor structure (31) when being the defrosting running.

[0070] between the ejection side of the compressing mechanism (3 1) of this senior side hot gas path (46) and first magnetic valve (SV1), is connected with an end of high pressure ingress pipe (47).This high pressure ingress pipe (47) is by the high-voltage line of senior side hot gas path (46) connection compressing mechanism (31), and the other end of this high pressure ingress pipe (47) connects the 4th valve port (P4) of the 3rd four-way change-over valve (37).

[0071] the 3rd four-way change-over valve can be changed first state and second state, first state is that first valve port (P1) and second valve port (P2) interconnect and the 3rd valve port (P3) and the 4th valve port (P4) interconnect (state shown in Fig. 1 solid line), and second state is that first valve port (P1) and the 4th valve port (P4) interconnect and second valve port (P2) and the 3rd valve port (P3) interconnect (state shown in Fig. 1 dotted line).

[0072] the ejection side of DC frequency conversion compressor reducer (31a) connects first bleed pipe (48a), and the first fixed ejection side of compressor reducer (31b) frequently connects second bleed pipe (48b), and the second fixed ejection side of compressor reducer (31c) frequently connects the 3rd bleed pipe (48c).Be provided with non-return valve (CV3) at first bleed pipe (48a), this non-return valve (CV3) is forbidden refrigerant flow direction DC frequency conversion compressor reducer (31a), be provided with non-return valve (CV4) at second bleed pipe (48b), this non-return valve (CV4) is forbidden the refrigerant flow direction first fixed compressor reducer (31b) frequently, be provided with non-return valve (CV5) at the 3rd bleed pipe (48c), this non-return valve (CV5) is forbidden the refrigerant flow direction second fixed compressor reducer (31c) frequently.First bleed pipe (48a), second bleed pipe (48b), and back, the 3rd bleed pipe (48c) interflow connect above-mentioned high-pressure air pipe (45).Between the tie point of the 3rd bleed pipe (48c) and high-pressure air pipe (45) and non-return valve (CV5), be connected with ejection tube connector (49).

First valve port (P1) of [0073] first four-way change-over valve (35) connects high-pressure air pipe (45), second valve port (P2) is by first tracheae (50) junction chamber outer heat-exchanger (32), the 3rd valve port (P3) connects second four-way change-over valve (36) by gas connection pipe (52), and the 4th valve port (P4) connects the second gas side draught excluder (39b) by second tracheae (51).This first four-way change-over valve (35) can be changed first state and second state, first state is that first valve port (P1) and second valve port (P2) interconnect and the 3rd valve port (P3) and the 4th valve port (P4) interconnect (state shown in Fig. 1 solid line), and second state is that first valve port (P1) and the 4th valve port (P4) are communicated with and second valve port (P2) and the 3rd valve port (P3) interconnect (state shown in Fig. 1 dotted line).

First valve port (P1) of [0074] second four-way change-over valve (36) connects ejection tube connector (49), and its 3rd valve port (P3) connects the second low pressure tracheae (44), and its 4th valve port (P4) connects gas connection pipe (52).And second valve port (P2) of second four-way change-over valve (36) is sealed.This second four-way change-over valve (36) can be changed first state and second state, first state is that first valve port (P1) and second valve port (P2) interconnect and the 3rd valve port (P3) and the 4th valve port (P4) interconnect (Fig. 1 is at state shown in the solid line), and second state is that first valve port (P1) and the 4th valve port (P4) interconnect and second valve port (P2) and the 3rd valve port (P3) interconnect (state shown in Fig. 1 dotted line).

[0075] outdoor heat converter (32) is that finned tube (fin-and-tube) heat exchanger of plate-fin (crossfin) constitutes the heat source side heat exchanger.Be attached with outdoor fan (32a) at this outdoor heat converter (32a).By this outdoor fan (48) outdoor air is delivered to outdoor heat converter (32), carry out heat exchange between cold-producing medium and the outdoor air at outdoor heat converter (32).As mentioned above, an end of outdoor heat converter (32) connects first four-way change-over valve (35).On the other hand, the other end of outdoor heat converter (32) connects receiver (33) top by the first liquid pipe (53).Be provided with non-return valve (CV6) at this first liquid pipe (51), this non-return valve (CV6) allows cold-producing medium to flow to receiver (33) and forbid that cold-producing medium flows to outdoor heat converter (32) from receiver (33) from outdoor heat converter (32).

[0076] bottom of receiver (33) is connected with an end of the second liquid pipe (54).The other end of this second liquid pipe (54) connects hydraulic fluid side draught excluder (38).Be provided with non-return valve (CV7) at the second liquid pipe (54), this non-return valve (CV7) allows cold-producing medium to flow to hydraulic fluid side draught excluder (38) and forbid that cold-producing medium flows to receiver (33) from hydraulic fluid side draught excluder (38) from receiver (33).

[0077] between the non-return valve (CV7) and hydraulic fluid side draught excluder (38) of the second liquid pipe (54), is connected with an end of the 3rd liquid pipe (55).The other end of this 3rd liquid pipe (55) connects receiver (33) top.And, being provided with non-return valve (CV8) at the 3rd liquid pipe (53), this non-return valve (CV8) allows cold-producing medium to flow to receiver (33) and forbid that cold-producing medium flows to hydraulic fluid side draught excluder (38) from receiver (33) from hydraulic fluid side draught excluder (38).

[0078] at the end that is connected with the 4th liquid pipe (56) between receiver (33) and the non-return valve (CV7) that is positioned at of the second liquid pipe (52).The other end of the 4th liquid pipe (56) is connected the first liquid pipe (53) between outdoor heat converter (32) and the non-return valve (CV6).And, be provided with outdoor expansion valve (34) at the 4th liquid pipe (56).

[0079] also is provided with various sensors and pressure switch in outdoor loop (30).For example, be provided with ejection temperature sensor (57) and ejection pressure sensor (not diagrammatic sketch) at high-pressure air pipe (45).Be provided with high-pressure switch (58) at first bleed pipe (48a) and the 3rd bleed pipe (48c).And (41a, 41b 41c) are provided with not the inlet temperature sensor and the suction pressure sensor of diagrammatic sketch at each suction line.Further, near outdoor fan (32a), be provided with outside air-temperature sensor (59).

[0080] " air-conditioning unit "

As mentioned above, air-conditioning unit (12) has air conditioner loop (air heat exchanger loop) (60).In air conditioner loop (60), towards the gas side, be provided with air-conditioning expansion valve (61) and air heat exchanger (62) in regular turn from the liquid side.Heat exchanger of air condition (62) is made of finned tube (fin-and-tube) heat exchanger of plate-fin (crossfin).Carry out heat exchange between cold-producing medium and the room air at this heat exchanger of air condition (62).On the other hand, air-conditioning expansion valve (61) is made of electric expansion valve.

[0081] is provided with heat-exchanger temperature sensor (63) and refrigerant temperature sensors (64) at air-conditioning unit (12).Heat-exchanger temperature sensor (63) is installed in the heat pipe of heat exchanger of air condition (62).Refrigerant temperature sensors (64) is installed near the gas side of air conditioner loop (60).And, be provided with interior air-temperature sensor (65) and air-conditioning fan (66) at air-conditioning unit (12).By air-conditioning fan (66) room air in the shop is delivered to heat exchanger of air condition (62).

[0082] " refrigerator display case "

As mentioned above, refrigerator display case (13) has refrigeration circuit (70).In refrigeration circuit (70), towards the gas side, be provided with refrigeration expansion valve (71) and refrigeration heat exchanger (first cooling heat exchanger) (72) in regular turn from the liquid side.Refrigeration heat exchanger (72) is that finned tube (fin-and-tube) heat exchanger by plate-fin (crossfin) is constituted.This refrigerates heat exchanger (72), carries out the heat exchange between cold-producing medium and Ku Nei air.On the other hand, refrigeration expansion valve (71) is made of electric expansion valve.

[0083] is provided with heat-exchanger temperature sensor (73) and refrigerant temperature sensors (74) at refrigerator display case (13).Heat-exchanger temperature sensor (73) is installed in the heat pipe of refrigeration heat exchanger (72).Gas refrigerant temperature sensor (74) is installed near the gas side of refrigeration circuit (70), and liquid refrigerant temperature sensor (75) is installed near the liquid side of refrigeration circuit (70).And, be provided with temperature sensor in the freezer (76) and freezer internal fan (77) at refrigerator display case (13).By this freezer internal fan (77) air in the storehouse of this refrigerator display case (13) is delivered to refrigeration heat exchanger (72).

[0084] " refrigerated display case "

As mentioned above, refrigerated display case (14) has refrigerating circuit (80).In refrigerating circuit (80),, be provided with in regular turn towards the gas side from the liquid side as refrigerant heat exchanger (81), drip pan heater (drainpan heater) (82), freezing expansion valve (83), freezing heat-exchanger (second cooling heat exchanger) (84) and as the DC frequency conversion compressor reducer of auxiliary compressor (auxiliary compressor) (85) usefulness.Freezing heat-exchanger (84) is made of the fin-tube heat exchanger of plate-fin.This freezing heat-exchanger (84) carries out the heat exchange between cold-producing medium and Ku Nei air.On the other hand, freezing expansion valve (83) is made of electric expansion valve.This freezing expansion valve (83) can be regulated the expansion valve of aperture for being located at refrigerating circuit (30).

[0085] heat exchanger of refrigerant heat exchanger (81) for carrying out heat exchange between the cold-producing medium for example is made of heat-exchangers of the plate type.This refrigerant heat exchanger (81) have the high-pressure side stream with (81a) with low-pressure side stream (81b), high-pressure side stream (81a) connects freezing side difference liquid pipe (21b), and low-pressure side stream (81b) connects from the branch pipe (86) of high-pressure side stream (81a) the downstream institute difference of freezing side difference liquid pipe (21b).This branch pipe (86) has electric expansion valve (87) at low-pressure side stream (81b) upstream side, connects the middle position of pressing of auxiliary compressor in low-pressure side stream (81b) downstream.Constitute economizer (economizer) by this refrigerant heat exchanger (81) and electric expansion valve (87).

[0086] be provided with non-return valve (CV9) at the freezing side difference tracheae (22b) as the bleed pipe of auxiliary compressor (85), this non-return valve (CV9) allows (85) ejection from cold-producing medium from auxiliary compressor and reverse flow inhibition.In the position in non-return valve (CV9) downstream of freezing side difference tracheae (22b) with as the suction line (88) of the suction line of auxiliary compressor (85), be connected with rudimentary side hot gas path (89).This rudimentary side hot gas path (89) connects above-mentioned freezing side difference tracheae (22b) and suction line (88), be that cold-producing medium flows to the path of freezing heat-exchanger (84) from freezing side difference tracheae (22b) when allowing the defrosting running, be provided with second magnetic valve (SV2) as rudimentary side switch valve.

[0087] is provided with heat-exchanger temperature sensor (90) and refrigerant temperature sensors (91,92) at refrigerated display case (14).Heat-exchanger temperature sensor (90) is installed in the heat pipe of freezing heat-exchanger (84).Gas refrigerant temperature sensor (91) be installed in refrigerating circuit (80) the gas side near.Liquid refrigerant temperature sensor (92) be installed in refrigerating circuit (80) the liquid side near.Drip pan heater temperature sensor (93) be installed in drip pan heater (82) near.And,, be provided with temperature sensor (94) and freezer internal fan (95) in the freezer in refrigerated display case (14).By freezer internal fan (95), air in the storehouse of refrigerated display case (14) is delivered to freezing heat-exchanger (84).

[0088] " overall structure of refrigerant loop "

As mentioned above, the refrigerant loop of present embodiment (20) has possessed the loop of refrigerated storage/refrigerating system side and the loop of air-conditioning system side, in the loop of refrigerated storage/refrigerating system side, be provided with the outdoor loop (30) of outdoor heat converter (32) with compressing mechanism (31), the cooling circuit (refrigeration circuit (70)) and refrigerating circuit (80) that have many cooling heat exchangers (72,84) separately) be connected in parallel mutually.At the above-mentioned refrigerating circuit (80) of the cooling circuit of at least one system, auxiliary compressor (85) freezing heat-exchanger (84) that is connected in series.

[0089] and, optionally import many cooling heat exchangers (72 as ejection cold-producing medium with the compressing mechanism (31) of outdoor loop (30), 84) at least one hot gas in imports path (46,89) possessed senior side hot gas path (46) and rudimentary side hot gas path (89), structurally can carry out carrying out as condenser the defrosting running of kind of refrigeration cycle with cooling heat exchanger (72,84).

[0090] and, in this refrigerant loop (20), comprised having the air conditioner loop (60) that heat exchanger of air condition (62) carries out room conditioning.And, as described later as, the defrosting running when defrosting in the time of structurally can carrying out cold air running and heating installation; Defrosting during cold air running (the first defrosting running), with cooling heat exchanger (72,84) as condenser and with heat exchanger of air condition (62) as evaporimeter; Defrosting during heating installation running (the second defrosting running), with cooling heat exchanger (72,84) as condenser and with outdoor heat converter (32) as evaporimeter.

-running action-

The main running action that above-mentioned refrigerating plant (10) is carried out below will be described.

[0091] " cold air operation "

Cold air operation is: carry out the cooling of air in the storehouse in refrigerator display case (13) and refrigerated display case (14), and carry out the cooling of room air so that nice and cool in the shop at air-conditioning unit (12).

[0092] as shown in Figure 2, in refrigerant loop (20), set first four-way change-over valve (35), second four-way change-over valve (36) and the 3rd four-way change-over valve (37) for first state.And when outdoor expansion valve (34) full cut-off, the aperture of air-conditioning expansion valve (61), refrigeration expansion valve (71) and freezing expansion valve (83) is subjected to suitable adjusting; First magnetic valve (SV1) of senior side hot gas path (46), and second magnetic valve (SV2) of rudimentary side hot gas path (89) then be closed.In this state, running DC frequency conversion compressor reducer (31a), the first fixed compressor reducer (31b) frequently, second fixed compressor reducer (31c) and the auxiliary compressor (85) frequently.

[0093] cold-producing medium that is sprayed from DC frequency conversion compressor reducer (31a), the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently, by each bleed pipe (48a, 48b, 48c) at high-pressure air pipe (45) interflow, and be sent to outdoor heat converter (32) by first four-way change-over valve (35).In outdoor heat converter (32), cold-producing medium condenses to the outdoor air heat radiation.The cold-producing medium that condenses at outdoor heat converter (32) by receiver (33) first hydraulic fluid side contact pipe arrangement (21) of flowing through, and is assigned to refrigeration side difference liquid pipe (21a), freezing side difference liquid pipe (21b) and second hydraulic fluid side contact pipe arrangement (23).

[0094], is imported into refrigeration heat exchanger (72) after by refrigeration expansion valve (71) time, being reduced pressure from the cold-producing medium of refrigeration side difference liquid pipe (21a) inflow refrigeration circuit (70).At refrigeration heat exchanger (72), cold-producing medium air heat absorption and evaporating in the storehouse.At this moment, at refrigeration heat exchanger (72), for example the evaporating temperature with cold-producing medium is set in about-5 ℃.At the cold-producing medium of refrigeration heat exchanger (72) evaporation, flow into first gas side contact pipe arrangement (22) from refrigeration side difference tracheae (22a).In refrigerator display case (13), will be supplied in the storehouse by air in the storehouse of refrigeration heat exchanger (72) cooling, make storehouse temperature for example be maintained at about 5 ℃.

[0095] flows into the cold-producing medium of refrigerating circuit (80) from freezing side difference liquid pipe (21b), behind refrigerant heat exchanger (81) and drip pan heater (82), be directed to freezing heat-exchanger (84) after by freezing expansion valve (83) time, being reduced pressure.In freezing heat-exchanger (84), cold-producing medium air heat absorption and evaporating in the storehouse.At this moment, in freezing heat-exchanger (84), the evaporating temperature of cold-producing medium for example is set in about-30 ℃.In refrigerated display case (14), will be frozen that air supplies in the storehouse in the storehouse of heat exchanger (84) cooling, make storehouse temperature such as be maintained at about-20 ℃.

[0096] at the cold-producing medium of freezing heat-exchanger (84) evaporation, is inhaled into auxiliary compressor (85) by suction line (88).At the compressed cold-producing medium of auxiliary compressor (85), flow into first gas side contact pipe arrangement (22) by freezing side difference tracheae (22b) from bleed pipe (98).

[0097] at first gas side contact pipe arrangement (22), from refrigeration circuit (70) cold-producing medium of being sent here and the cold-producing medium interflow of being sent here from refrigerating circuit (80).And these cold-producing mediums flow into first suction line (41a) and second suction line (41b) from first gas side contact pipe arrangement (22) by the first low pressure tracheae (42), are inhaled into the DC frequency conversion compressor reducer (31a) and the first fixed compressor reducer (31b) frequently.The DC frequency conversion compressor reducer (31a) and the first fixed compressor reducer (31b) frequently compress the cold-producing medium that is sucked respectively and spray to first bleed pipe (48a) and second bleed pipe (48b).

[0098] on the other hand, the cold-producing medium that flows into second hydraulic fluid side contact pipe arrangement (23) is fed into air conditioner loop (60).Flow into the cold-producing medium of air conditioner loop (60), by air-conditioning expansion valve (61) time, be subjected to decompression and be directed to heat exchanger of air condition (62).In heat exchanger of air condition (62), cold-producing medium evaporates from the room air heat absorption.In air-conditioning unit (12), be fed in the shop by the room air of heat exchanger of air condition (62) cooling.Cold-producing medium in heat exchanger of air condition (62) evaporation, flow into outdoor loop (30) by second gas side contact pipe arrangement (24), in regular turn by behind first four-way change-over valve (35) and second four-way change-over valve (36), be inhaled into the second fixed compressor reducer (31c) frequently by the 3rd suction line (41c) from second tracheae (51) from the second low pressure tracheae (44).The second fixed compressor reducer (31c) frequently compresses the cold-producing medium that is sucked and is ejected into the 3rd bleed pipe (48c).

[0099] and, during the cold air operation of Fig. 2, by setting the 3rd four-way change-over valve (37) for first state, (31a 31b), and uses a compressor (31c) at the air-conditioning system side loop to use two compressors at the refrigerated storage/refrigerating system side loop; But, by the 3rd four-way change-over valve (37) is converted to second state, also can use a compressor (31a) at the refrigerated storage/refrigerating system side loop, and the air-conditioning system side loop use two compressors (31b, 31c).And, also can make three compressor (31a when setting the 3rd four-way change-over valve (37) for first state or one of them state of second state, 31b, 31c) wherein one stop, and respectively use a compressor respectively at refrigerated storage/refrigerating system side loop and air-conditioning system side loop.

[0100] " the defrosting running during cold air "

Defrosting during as cold air running can be carried out simultaneously Fig. 3 to refrigeration heat exchanger (72) and freezing heat-exchanger (84) defrosting Fig. 4 that the cooling of turning round and carrying out freezing heat-exchanger (84) refrigerates the defrosting of heat exchanger (72) simultaneously running that defrosts that defrosts.And the flow of refrigerant (defrosting path) during the defrosting running is represented with symbol (25).

[0101] at first, the defrosting of key diagram 3 running.

[0102] as shown in Figure 3, in the refrigerant loop (20), first four-way change-over valve (35) is set at first state with second four-way change-over valve (36), and the 3rd four-way change-over valve (37) is set at second state.And, outdoor expansion valve (34) full cut-off, and refrigeration expansion valve (71) and freezing expansion valve (83) standard-sized sheet, on the other hand, the aperture of air-conditioning expansion valve (61) is subjected to suitable adjusting.First magnetic valve (SV1) of senior side hot gas path (46) and second magnetic valve (SV2) of rudimentary side hot gas path (89) are unlocked.In this state, the running first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently.

[0103] decides the cold-producing medium that frequency compressor reducer (31c) is sprayed from the first fixed compressor reducer (31b) frequently and second, by each bleed pipe (48b, 48c), be sent to outdoor heat converter (32) by first tracheae (50) from first four-way change-over valve (35) at high-pressure air pipe (45) interflow.In outdoor heat converter (32), cold-producing medium condenses to the outdoor air heat radiation.Cold-producing medium in that outdoor heat converter (32) condenses behind receiver (33) inflow first hydraulic fluid side contact pipe arrangement (21), flows into second hydraulic fluid side contact pipe arrangement (23).

[0104] on the other hand, the cold-producing medium of the part that the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) are frequently sprayed, flow to first gas side contact pipe arrangement (22) from senior side hot gas path (46) through the first low pressure tracheae (42), be diverted to refrigeration side difference tracheae (22a) and freezing side difference tracheae (22b).

[0105] flow through the cold-producing medium that refrigerates side difference tracheae (22a), flow into refrigeration heat exchanger (72), the air heat radiation is condensed in the storehouse.At this moment, the frost attached to refrigeration heat exchanger (72) is melted.At the cold-producing medium that condenses of refrigeration heat exchanger (72), flow through refrigeration side difference liquid pipe (21a) by refrigeration expansion valve (71), flow into second hydraulic fluid side contact pipe arrangement (23) and cold-producing medium interflow from outdoor unit (11).

[0106] flow through the cold-producing medium of freezing side difference tracheae (22b), flow into freezing heat-exchanger (84) by rudimentary side hot gas path (89), the air heat radiation is condensed in the storehouse.At this moment, the frost attached to freezing heat-exchanger (84) melts.The cold-producing medium that condenses at freezing heat-exchanger (84), by freezing expansion valve (83), drip pan heater (82), and refrigerant heat exchanger (81), flow into freezing side difference liquid pipe (21b), and flow into second hydraulic fluid side contact pipe arrangement (23), with cold-producing medium interflow from outdoor unit (11).

[0107] cold-producing medium at second hydraulic fluid side contact pipe arrangement (23) interflow is fed into air conditioner loop (60).Flow into the cold-producing medium of air conditioner loop (60), be subjected to decompression during by air-conditioning expansion valve (61) and be directed to heat exchanger of air condition (62).In heat exchanger of air condition (62), cold-producing medium is from room air heat absorption evaporation.In air-conditioning unit (12), will supply in the shop at the room air that heat exchanger of air condition (62) are cooled off.Cold-producing medium in heat exchanger of air condition (62) evaporation, flow into outdoor loop (30) by second gas side contact pipe arrangement (24), from second tracheae (51) in regular turn by behind first four-way change-over valve (35) and second four-way change-over valve (36), by second suction line (41b) and the 3rd suction line (41c), be inhaled into the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently from the second low pressure tracheae (44).The cold-producing medium that the first fixed compressor reducer (31b) frequently and second fixed compressor reducer (31c) the frequently compression are sucked is ejected into second bleed pipe (48b) and the 3rd bleed pipe (48c).

[0108] as mentioned above, defrosting running at Fig. 3, can use the heat that absorbed at indoor heat converter (62) and (31b 31c) by the heat that compressed refrigerant obtained, carries out the defrosting to refrigeration heat exchanger (72) and freezing heat-exchanger (84) simultaneously at compressor.

[0109] and, though used the first fixed compressor reducer (31b) frequently and second fixed compressor reducer (31c) two frequently in the running as shown in Figure 3, also can only using wherein, a compressor turns round.

[0110] and, only at freezing heat-exchanger (84) when defrosting, closing refrigeration expansion valve (71) in the operating condition as Fig. 3, not make cold-producing medium flow into refrigerator display case (13) just passable.

[0111] then, the defrosting of key diagram 4 running.

[0112] as shown in Figure 4, in refrigerant loop (20), set first four-way change-over valve (35) and second four-way change-over valve (36) for first state, and set the 3rd four-way change-over valve (37) for second state.And, outdoor expansion valve (34) full cut-off and refrigerate expansion valve (71) standard-sized sheet, the aperture of freezing expansion valve (83) and air-conditioning expansion valve (61) is subjected to suitable adjusting.Open first magnetic valve (SV1) of senior side hot gas path (46), and close second magnetic valve (SV2) of rudimentary side hot gas path (89).In this state, the running first fixed compressor reducer (31b) frequently, second fixed compressor reducer (31c) and the auxiliary compressor (85) frequently.

The cold-producing medium that [0113] the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) are frequently sprayed, by each bleed pipe (48b, 48c), be sent to outdoor heat converter (32) by first tracheae (50) from first four-way change-over valve (35) at high-pressure air pipe (45) interflow.In outdoor heat converter (32), cold-producing medium condenses to the outdoor air heat radiation.The cold-producing medium that condenses at outdoor heat converter (32), flow through first hydraulic fluid side contact pipe arrangement (21) by receiver (33) after, be diverted to second hydraulic fluid side contact pipe arrangement (23) and freezing side difference liquid pipe (21b).

[0114] from the cold-producing medium of freezing side difference liquid pipe (21b) inflow refrigerating circuit (80), behind refrigerant heat exchanger (81) and drip pan heater (82), is subjected to decompression during by freezing expansion valve (83) and is imported into freezing heat-exchanger (84).In freezing heat-exchanger (84), cold-producing medium is air heat absorption evaporation in the storehouse.At this moment, in freezing heat-exchanger (84), the evaporating temperature of cold-producing medium for example is set at about-30 ℃.In refrigerated display case (14), will in the storehouse that freezing heat-exchanger (84) are cooled off, supply in the storehouse by air, storehouse temperature for example is held about-20 ℃.

[0115] at the cold-producing medium of freezing heat-exchanger (84) evaporation, is inhaled into auxiliary compressor (85) by suction line (88).Cold-producing medium in that auxiliary compressor (85) is compressed flows into first gas side contact pipe arrangement (22) from bleed pipe (98) by freezing side difference tracheae (22b).At this moment, the aperture of being located at the electric expansion valve (87) of branch pipe (86) is controlled, economizer performance function.Therefore, the ejection pressure of auxiliary compressor (85) is enhanced with the first fixed compressor reducer (31b) frequently and second and decides the identical substantially degree of ejection pressure of compressor reducer (31c) frequently.

[0116] on the other hand, the part of the cold-producing medium of the first fixed compressor reducer (31b) frequently and second fixed compressor reducer (31c) the frequently ejection, flow through first gas side contact pipe arrangement (22) from senior side hot gas path (46) through the first low pressure tracheae (42), and flow into refrigeration side difference tracheae (22a) from the cold-producing medium interflow of freezing unit (14).

[0117] flow through the cold-producing medium that refrigerates side difference tracheae (22a), flow into refrigeration heat exchanger (72), the air heat radiation is condensed in the storehouse.At this moment, the frost attached to refrigeration heat exchanger (72) is melted.Refrigerating the cold-producing medium that heat exchanger (72) condenses, after flowing through refrigeration side difference liquid pipe (21a) by refrigeration expansion valve (71), be diverted to second hydraulic fluid side contact pipe arrangement (23) and freezing side difference liquid pipe (21b) with cold-producing medium from outdoor unit (11).

[0118] cold-producing medium that flows through second hydraulic fluid side contact pipe arrangement (23) is fed into air conditioner loop (60).Flow into the cold-producing medium of air conditioner loop (60), being reduced pressure during by air-conditioning expansion valve (61) is imported into heat exchanger of air condition (62).In heat exchanger of air condition (62), cold-producing medium is from room air heat absorption evaporation.In air-conditioning unit (12), will supply in the shop at the room air that heat exchanger of air condition (62) are cooled off.Cold-producing medium in heat exchanger of air condition (62) evaporation, flow into outdoor loop (30) by second gas side contact pipe arrangement (24), in regular turn by behind first four-way change-over valve (35) and second four-way change-over valve (36), be inhaled into the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently by second suction line (41b) and the 3rd suction line (41c) from second tracheae (51) from the second low pressure tracheae (44).The cold-producing medium that the first fixed compressor reducer (31b) frequently and second fixed compressor reducer (31c) the frequently compression suck is to second bleed pipe (48b) and the 3rd bleed pipe (48c) ejection.

[0119] as mentioned above, in the defrosting running of Fig. 4, can use the heat that absorbed at indoor heat converter (62) and freezing heat-exchanger (84) and carry out defrosting refrigeration heat exchanger (72) at compressor (31b, 31c, the 85) heat that compressed refrigerant obtained.

[0120] and, though use two running of the first fixed compressor reducer (31b) frequently and the second fixed frequency compressor reducer (31c) shown in Fig. 4, also can only make wherein one compressor operation.

[0121] " heating installation running "

Heating installation operates as: carry out the cooling of air in the storehouse at refrigerator display case (13) and refrigerated display case (14), and come in the heating shop in the heating that air-conditioning unit (12) carries out room air.

[0122] as shown in Figure 5, in the refrigerant loop (20), set first four-way change-over valve (35) for second state respectively, set second four-way change-over valve (36) and the 3rd four-way change-over valve (37) for first state.And, air-conditioning expansion valve (61) is a standard-sized sheet, and outdoor expansion valve (34), refrigeration expansion valve (71), and the aperture of freezing expansion valve (83) be subjected to suitable adjusting, first magnetic valve (SV1) of senior side hot gas path (46) and second magnetic valve (SV2) of rudimentary side hot gas path (89) are closed.In this state, running DC frequency conversion compressor reducer (31a), the first fixed compressor reducer (31b) frequently, the second fixed compressor reducer (31c) frequently, with auxiliary compressor (85).

[0123] DC frequency conversion compressor reducer (31a), the first fixed compressor reducer (31b) frequently and second are decided the cold-producing medium that frequency compressor reducer (31c) is sprayed, get in touch with the heat exchanger of air condition (62) that pipe arrangement (24) is imported into air conditioner loop (60) from high-pressure air pipe (45), first four-way change-over valve (35) and second tracheae (51) by second gas side, condense to the room air heat radiation.In air-conditioning unit (12), will be subjected to indoor air heated in heat exchanger of air condition (62) and supply in the shop.At the cold-producing medium that heat exchanger of air condition (62) condenses, flow through second hydraulic fluid side contact pipe arrangement (23) after, be diverted to refrigeration side difference liquid pipe (21a), freezing side difference liquid pipe (21b) and first hydraulic fluid side and get in touch with pipe arrangement (21).

[0124] flow through the cold-producing medium that refrigerates side difference liquid pipe (21a) and flow into refrigerator display case (13), the cold-producing medium that flows through freezing side difference liquid pipe (21b) flows into refrigerated display case (14).When refrigerator display case (13) and refrigerated display case (14) and above-mentioned cold air operation, similarly, carry out the cooling of air in the storehouse.The cold-producing medium of refrigeration heat exchanger (72) evaporation, with in freezing heat-exchanger (84) evaporation back in the compressed cold-producing medium of auxiliary compressor (85), at first gas side contact pipe arrangement (22) interflow.The cold-producing medium that flows through first gas side contact pipe arrangement (22) is diverted to first suction line (41a) and second suction line (41b), is inhaled into DC frequency conversion compressor reducer (31a) and first frequency compressor reducer (31b) and being compressed calmly.

[0125] flows through the cold-producing medium of first hydraulic fluid side contact pipe arrangement (21), flow into receiver (33) from the 3rd liquid pipe (55) and flow through the 4th liquid pipe (56) and reduced pressure at outdoor expansion valve (34).The cold-producing medium that is reduced pressure at outdoor expansion valve (34) is directed to outdoor heat converter (32), from outdoor air heat absorption evaporation.At the cold-producing medium of outdoor heat converter (32) evaporation,, be inhaled into the second fixed compressor reducer (31c) frequently from the second low pressure tracheae (44) by the 3rd suction line (41c) and be compressed by first four-way change-over valve (35) and second four-way change-over valve (36).

[0126] so, heating installation when running, refrigeration heat exchanger (72), freezing heat-exchanger (84), and outdoor heat converter (32) in cold-producing medium absorb heat, and in heat exchanger of air condition (62) refrigerant loses heat.And, utilize in refrigeration heat exchanger (72) and freezing heat-exchanger (84) the cold-producing medium heat that air absorbed in the storehouse and outdoor heat converter (32) cold-producing medium come in the heating shop from the heat that outdoor air absorbed.

[0127] and, when the heating installation ability is superfluous in the running that with outdoor heat converter (32) is evaporimeter, also can carry out following running: as the state of Fig. 5, stop the second fixed compressor reducer (31c) frequently and close outdoor expansion valve (34) simultaneously, cold-producing medium heat absorption in refrigeration heat exchanger (72) and freezing heat-exchanger (84), the state of refrigerant loses heat in heat exchanger of air condition (62).

[0128] and, when the heating installation energy is still superfluous, simultaneously outdoor expansion valve (34) is converted to standard-sized sheet turn round (the second fixed compressor reducer (31c) is frequently stopped) except second four-way change-over valve (36) being converted to second state, as condenser, carry out to outdoor running of distributing unnecessary heat just passable with outdoor heat converter (32).

[0129] " the defrosting running during heating installation "

Defrosting running during as heating installation can be carried out the defrosting running of Fig. 6 and the defrosting running of Fig. 7, and the defrosting of Fig. 6 operates as the defrosting of carrying out simultaneously refrigeration heat exchanger (72) and freezing heat-exchanger (84); The defrosting of Fig. 7 operates as cooling freezing heat-exchanger (84) and carries out simultaneously refrigerating the defrosting of heat exchanger (72).

[0130] at first, the defrosting of key diagram 6 running.

[0131] as shown in Figure 6, in the refrigerant loop (20), first four-way change-over valve (35) and the 3rd four-way change-over valve (37) are configured to second state, and second four-way change-over valve (36) is configured to first state.And air-conditioning expansion valve (61), refrigeration expansion valve (71) and freezing expansion valve (83) are standard-sized sheet, and on the other hand, the aperture of outdoor expansion valve (34) is subjected to suitable adjusting.First magnetic valve (SV1) of senior side hot gas path (46) and second magnetic valve (SV2) of rudimentary side hot gas path (89) are unlocked.In this state, the running first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently.

The cold-producing medium that [0132] the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) are frequently sprayed, by each bleed pipe (48b, 48c) at high-pressure air pipe (45) interflow, the outdoor heat converter (32) that is directed to air conditioner loop (60) by second gas side contact pipe arrangement (24) from first four-way change-over valve (35) and second tracheae (51) dispels the heat to room air and condenses.In air-conditioning unit (12), will be subjected to indoor air heated in heat exchanger of air condition (62) and supply in the shop.At the cold-producing medium that heat exchanger of air condition (62) condenses, flow through second hydraulic fluid side contact pipe arrangement (23) after, flow into first hydraulic fluid side contact pipe arrangement (21).

[0133] on the other hand, the part of the cold-producing medium of the first fixed compressor reducer (31b) frequently and second fixed compressor reducer (31c) the frequently ejection, flow through first gas side contact pipe arrangement (22) from senior side hot gas path (46) through the first low pressure tracheae (42), be diverted to refrigeration side difference tracheae (22a) and freezing side difference tracheae (22b).

[0134] flows through the cold-producing medium that refrigerates side difference tracheae (22a), flow into refrigeration heat exchanger (72) air heat radiation in the storehouse and condense.At this moment, the frost attached to refrigeration heat exchanger (72) is melted.At the cold-producing medium that condenses of refrigeration heat exchanger (72), flow through refrigeration side difference liquid pipe (21a) by refrigeration expansion valve (71), flow into first hydraulic fluid side contact pipe arrangement (21) and cold-producing medium interflow from air-conditioning unit (12).

[0135] flow through the cold-producing medium of freezing side difference tracheae (22b), flow into freezing heat-exchanger (84) by rudimentary side hot gas path (89), the air heat radiation is condensed in the storehouse.At this moment, the frost attached to freezing heat-exchanger (84) is melted.The cold-producing medium that condenses at freezing heat-exchanger (84), flow through freezing side difference liquid pipe (21b) by freezing expansion valve (83), drip pan heater (82) and refrigerant heat exchanger (81), flow into first hydraulic fluid side contact pipe arrangement (21) and cold-producing medium interflow from air-conditioning unit (12).

[0136] flows through the cold-producing medium that pipe arrangement (21) is got in touch with in first hydraulic fluid side, flow into receiver (33), flow through the 4th liquid pipe (56) and reduced pressure at outdoor expansion valve (34) from the 3rd liquid pipe (55).The cold-producing medium that is reduced pressure at outdoor expansion valve (34) is directed to outdoor heat converter (32), from outdoor air heat absorption evaporation.Cold-producing medium in outdoor heat converter (32) evaporation, by first four-way change-over valve (35) and second four-way change-over valve (36), the compressor reducer (31b) and the second fixed compressor reducer (31c) frequently are compressed frequently calmly to be inhaled into first from the second low pressure tracheae (44) by second suction line (41b) and the 3rd suction line (41c).

[0137] as mentioned above, in the defrosting running of Fig. 6, can use the heat that absorbed at outdoor heat converter (32), with (31b, the 31c) heat that compressed refrigerant obtained refrigerate the defrosting of heat exchanger (72) and freezing heat-exchanger (84) simultaneously at compressor.

[0138] and, though use the first fixed compressor reducer (31b) frequently and the second fixed frequency compressor reducer (31c) two shown in the running of Fig. 6, also can only make wherein one compressor operation.

[0139] and, when only carrying out the defrosting of freezing heat-exchanger (84), in Fig. 6 operating condition, close refrigeration expansion valve (71), it is just passable to make that cold-producing medium does not flow to refrigerator display case (13).

[0140] then, the defrosting of key diagram 7 running.

[0141] as shown in Figure 7, in the refrigerant loop (20), set first four-way change-over valve (35) and the 3rd four-way change-over valve (37) for second state, set second four-way change-over valve (36) for first state.And air-conditioning expansion valve (61) and refrigeration expansion valve (71) are standard-sized sheet, and the aperture of freezing expansion valve (83) and outdoor expansion valve (34) is subjected to suitable adjusting.First magnetic valve (SV1) of senior side hot gas path (46) is unlocked, and second magnetic valve (SV2) of rudimentary side hot gas path (89) is closed.In this state, the running first fixed compressor reducer (31b) frequently, second fixed compressor reducer (31c) and the auxiliary compressor (85) frequently.

[0142] decides the cold-producing medium that frequency compressor reducer (31c) is sprayed from the first fixed compressor reducer (31b) frequently and second, by each bleed pipe (48b, 48c) at high-pressure air pipe (45) interflow, the outdoor heat converter (32) that is directed to air conditioner loop (60) by second gas side contact pipe arrangement (24) from first four-way change-over valve (35) and second tracheae (51) dispels the heat to room air and condenses.In air-conditioning unit (12), will be supplied in the shop by heat exchanger of air condition (62) indoor air heated.At the cold-producing medium that heat exchanger of air condition (62) condenses, flow through second hydraulic fluid side contact pipe arrangement (23) after, be diverted to freezing side difference liquid pipe (21b) and first hydraulic fluid side contact pipe arrangement (21).

[0143] from the cold-producing medium of freezing side difference liquid pipe (21b) inflow refrigerating circuit (80), behind refrigerant heat exchanger (81) and drip pan heater (82), is subjected to decompression during by freezing expansion valve (83) and is directed to freezing heat-exchanger (84).In freezing heat-exchanger (84), cold-producing medium is air heat absorption evaporation in the storehouse.At this moment, in freezing heat-exchanger (84), the evaporating temperature of cold-producing medium for example is set at about-30 ℃.In refrigerated display case (14), will in the storehouse that freezing heat-exchanger (84) are cooled off, supply in the storehouse by air, storehouse temperature for example is maintained at about-20 ℃.

[0144] at the cold-producing medium of freezing heat-exchanger (84) evaporation, is inhaled into auxiliary compressor (85) by suction line (88).Cold-producing medium in that auxiliary compressor (85) is compressed flow into first gas side contact pipe arrangement (22) from bleed pipe (98) by freezing side difference tracheae (22b).At this moment, the aperture of being located at the electric expansion valve (87) of branch pipe (86) is controlled, economizer performance function.Therefore, the ejection pressure of auxiliary compressor (85) is brought up to the first fixed compressor reducer (31b) frequently and second and is decided the identical substantially degree of ejection pressure of compressor reducer (31c) frequently.

[0145] on the other hand, the part of the cold-producing medium of the first fixed compressor reducer (31b) frequently and second fixed compressor reducer (31c) the frequently ejection, flow through first gas side contact pipe arrangement (22) from senior side hot gas path (46) through the first low pressure tracheae (42), with cold-producing medium interflow flow direction refrigeration side difference tracheae (22a) from freezing unit (14).

[0146] flow through the cold-producing medium that refrigerates side difference tracheae (22a), flow into refrigeration heat exchanger (72), the air heat radiation is condensed in the storehouse.At this moment, the frost attached to refrigeration heat exchanger (72) is melted.Refrigerating the cold-producing medium that heat exchanger (72) condenses, refrigeration side by refrigeration expansion valve (71), after flowing through difference liquid pipe (21a), be diverted to freezing side difference liquid pipe (21b) and first hydraulic fluid side contact pipe arrangement (21) with cold-producing medium from air-conditioning unit (12).

[0147] flows through the cold-producing medium that pipe arrangement (21) is got in touch with in first hydraulic fluid side, flow into receiver (33), flow through the 4th liquid pipe (56) and reduced pressure at outdoor expansion valve (34) from the 3rd liquid pipe (55).The cold-producing medium that is reduced pressure at outdoor expansion valve (34) is directed to outdoor heat converter (32), from outdoor air heat absorption evaporation.Cold-producing medium in outdoor heat converter (32) evaporation, by first four-way change-over valve (35) and second four-way change-over valve (36), the compressor reducer (31b) and the second fixed compressor reducer (31c) frequently are compressed frequently calmly to be inhaled into first from the second low pressure tracheae (44) by second suction line (41b) and the 3rd suction line (41c).

[0148] as mentioned above, in the defrosting of Fig. 7 running, can use the heat that absorbed at outdoor heat converter (32) and freezing heat-exchanger (84) and (31b, the 31c) heat of compressed refrigerant refrigerates the defrosting of heat exchanger (72) at compressor.

[0149] and, though two running using the first fixed compressor reducer (31b) frequently and the second fixed frequency compressor reducer (31c) has been shown among Fig. 7, but wherein one the compressor that also can only turn round.

[0150]-first the embodiment effect-

According to the refrigerating plant (10) of present embodiment, can not carry out refrigeration heat exchanger (72) and both defrostings of freezing heat-exchanger (84) even except refrigerant loop, do not establish defrost mechanism such as electric heater yet, so can prevent the complicated of apparatus structure.And not only both defrost to refrigeration heat exchanger (72) and freezing heat-exchanger (84) simultaneously, also can be only to wherein one defrost.Like this owing to can defrost to individual other heat exchanger (72,84), therefore can corresponding diversified defrosting running kenel.

[0151] further, existing refrigerating plant defrosts to freezing heat-exchanger as thermal source with the refrigeration heat exchanger, must consider heat absorption and heat radiation good combination during the defrosting running with refrigeration heat exchanger and freezing heat-exchanger, and restricted problem in the design is arranged, relatively, the refrigerating plant of present embodiment (10) does not then have the restriction in the design.

[0152] and, because therefore the heat that uses the heat that absorbed at heat exchanger of air condition (62) or absorb at outdoor heat converter (32) and refrigerate the defrosting of heat exchanger (72) and freezing heat-exchanger (84) at compressing mechanism (31) heat that compressed refrigerant obtained can carry out the good defrosting of efficient and turn round.

[0153] further, if with electric heater from external melt attached to the frost of refrigeration heat exchanger (72) and freezing heat-exchanger (84) storehouse temperature rise easily, but, therefore can suppress the rising of storehouse temperature because present embodiment is to melt internally attached to the frost that refrigerates heat exchanger (72) and freezing heat-exchanger (84) with the heat of cold-producing medium.

[0154] and, structurally only simultaneously to refrigerating the running form of heat exchanger (72) and freezing heat-exchanger (84) defrosting, the heat exchanger of FEFO defrosting continue to flow into hot gas then storehouse temperature will rise, but in the present embodiment because with each heat exchanger (72,84) defrost respectively, therefore wherein rising that the defrosting of heat exchanger FEFO then can prevent storehouse temperature really by stopping to flow into hot gas.

[0155] further, in the running that only refrigeration heat exchanger (72) is defrosted, owing in refrigerated display case (14), allow economizer performance function improve the ejection pressure of auxiliary compressor (85).When not using economizer, because the ejection pressure of the compressing mechanism (31) of outdoor unit (11) and the ejection pressure of auxiliary compressor (85) have bigger pressure differential, may cause damage to auxiliary compressor (85), still, can prevent this class problem by using economizer.

[0156] and, in the present embodiment,, also can stop air-conditioning and only carry out the running of freezer or stop the running that freezer only carries out air-conditioning though omitted the explanation of flowing in detail to the cold-producing medium of refrigerant loop (20).

[0157] " second embodiment "

The refrigerating plant of second embodiment (10), as shown in Figure 8, a part of structure of outdoor unit (11) is different with first embodiment.Specifically, the structure of its senior side hot gas path (46) and first embodiment difference to some extent.Hot gas imports the end connection high-pressure air pipe (45) of path (46) among this second embodiment, and the other end connects the 4th valve port (P4) of the 3rd four-way change-over valve (37).And, being provided with non-return valve (CV1) in first communicating pipe (43a) among first embodiment, second embodiment then is not provided with.

[0158] other structure is identical with first embodiment.

[0159]-the running action-

In a second embodiment, identical with first embodiment, can carry out cold air operation and

Heating installation running can defrost to refrigeration heat exchanger (72) and freezing heat-exchanger (84) both or one of them when cold air operation and during the heating installation running.

[0160] during cold air operation, as shown in Figure 9, first four-way change-over valve (35), second four-way change-over valve (36) and the 3rd four-way change-over valve (37) are configured to first state respectively.And outdoor expansion valve (34) is a full cut-off, and the aperture of air-conditioning expansion valve (61), refrigeration expansion valve (71) and freezing expansion valve (83) is subjected to suitable adjusting, and second magnetic valve (SV2) of rudimentary side hot gas path (89) is closed.In this state, start DC frequency conversion compressor reducer (31a), the first fixed compressor reducer (31b) frequently, second fixed compressor reducer (31c) and the auxiliary compressor (85) frequently.

What [0161] cold-producing medium was identical with state shown in Figure 2 circulates at refrigerant loop (10).And, carry out with outdoor heat converter (32) be condenser, with heat exchanger of air condition (62), refrigeration heat exchanger (72) and freezing heat-exchanger (84) kind of refrigeration cycle as evaporimeter.

Defrosting running during [0162] as cold air, can carry out the defrosting running of Figure 10 and the defrosting running of Figure 11, the defrosting of Figure 10 operates as the defrosting of carrying out simultaneously refrigeration heat exchanger (72) and freezing heat-exchanger (84), and the defrosting of Figure 11 operates as cooling freezing heat-exchanger (84) and simultaneously refrigeration heat exchanger (72) defrosted.

When [0163] defrosting of Figure 10 is turned round, set first four-way change-over valve (35) and second four-way change-over valve (36) for first state, set the 3rd four-way change-over valve (37) for second state.Simultaneously, outdoor expansion valve (34) is a full cut-off, and refrigeration expansion valve (71) and freezing expansion valve (83) are standard-sized sheet, and the aperture of air-conditioning expansion valve (61) is subjected to suitable adjusting.Open second magnetic valve (SV2) of rudimentary side hot gas path (89).In this state, the running first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently.

[0164] part that sprays cold-producing medium except the compressing mechanism (31) from outdoor unit (10) flows to refrigerator display case (13) and refrigerated display case (14) this point by the first low pressure tracheae (42) from senior side hot gas path (46) and the 3rd four-way change-over valve (37), the circulation in refrigerant loop (10) similarly of cold-producing medium and state shown in Figure 3.And carrying out with outdoor heat converter (32), refrigeration heat exchanger (72) and freezing heat-exchanger (84) is the kind of refrigeration cycle of evaporimeter as condenser and with heat exchanger of air condition (62).

When [0165] defrosting of Figure 11 is turned round, set first four-way change-over valve (35) and second four-way change-over valve (36) for first state, set the 3rd four-way change-over valve (37) for second state.And outdoor expansion valve (34) is a full cut-off, and refrigeration expansion valve (71) is a standard-sized sheet, and the aperture of freezing expansion valve (83) and air-conditioning expansion valve (61) is subjected to suitable adjusting.Second magnetic valve (SV2) of rudimentary side hot gas path (89) is closed.In this state, the running first fixed compressor reducer (31b) frequently, second fixed compressor reducer (31c) and the auxiliary compressor (85) frequently.

[0166] part of the cold-producing medium that is sprayed except the compressing mechanism (31) from outdoor unit (10) flows to refrigerator display case (13) this point by the first low pressure tracheae (42) from senior side hot gas path (46) and the 3rd four-way change-over valve (37), and cold-producing medium and the state shown in Figure 4 refrigerant loop (10) that coexists mutually circulates.And, carry out being condenser, being the kind of refrigeration cycle of evaporimeter with heat exchanger of air condition (62) and freezing heat-exchanger (84) with outdoor heat converter (32) and refrigeration heat exchanger (72).

When [0167] heating installation turns round, as shown in figure 12, set first four-way change-over valve (35) for second state, and will set first state for second four-way change-over valve (36) and the 3rd four-way change-over valve (37).And air-conditioning expansion valve (61) is a standard-sized sheet, and the aperture of outdoor expansion valve (34), refrigeration expansion valve (71) and freezing expansion valve (83) is subjected to suitable adjusting.Second magnetic valve (SV2) of rudimentary side hot gas path (89) is closed.In this state, running DC frequency conversion compressor reducer (31a), the first fixed compressor reducer (31b) frequently, second fixed compressor reducer (31c) and the auxiliary compressor (85) frequently.

[0168] cold-producing medium and state shown in Figure 5 similarly circulate at refrigerant loop (10).And, carry out being condenser, being the kind of refrigeration cycle of evaporimeter with heat exchanger of air condition (62), refrigeration heat exchanger (72) and freezing heat-exchanger (84) with outdoor heat converter (32).

[0169] and, if when the heating installation ability is superfluous in the running that with outdoor heat converter (32) is evaporimeter, then can carry out following running as Figure 12 state, just: stop the second fixed compressor reducer (31c) frequently and close outdoor expansion valve (34) simultaneously, cold-producing medium heat absorption in refrigeration heat exchanger (72) and freezing heat-exchanger (84), the state of refrigerant loses heat in heat exchanger of air condition (62).

[0170] and, if the heating installation ability is still superfluous, second state that then second four-way change-over valve (36) is converted to makes outdoor expansion valve (34) be converted to full-gear turn round (at this moment stop second frequently fixed compressor reducer (31c)) simultaneously, with outdoor heat converter (32) is condenser, unnecessary heat is rejected to outdoor just passable.

Defrosting running during [0171] as heating installation, can carry out as the defrosting running of Figure 13 and the defrosting running of Figure 14, the defrosting of Figure 13 operates as simultaneously refrigeration heat exchanger (72) and freezing heat-exchanger (84) is defrosted, and the defrosting of Figure 14 operates as cools off and defrost to refrigerating heat exchanger (72) freezing heat-exchanger (84).

When [0172] defrosting of Figure 13 is turned round, set first four-way change-over valve (35) and the 3rd four-way change-over valve (37) for second state, set second four-way change-over valve (36) for first state.And air-conditioning expansion valve (61), refrigeration expansion valve (71) and freezing expansion valve (83) are standard-sized sheet, and the aperture of outdoor expansion valve (34) is subjected to suitable adjusting.Second magnetic valve (SV2) of rudimentary side hot gas path (89) is opened.In this state, the running first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently.

[0173] part that sprays cold-producing medium except the compressing mechanism (31) from outdoor unit (10) flows to refrigerator display case (13) and refrigerated display case (14) this point cold-producing medium and identical the circulating at refrigerant loop (10) of state as shown in Figure 6 by the first low pressure tracheae (42) from senior side hot gas path (46) and the 3rd four-way change-over valve (37).And, carry out being condenser, being the kind of refrigeration cycle of evaporimeter with outdoor heat converter (32) with heat exchanger of air condition (62), refrigeration heat exchanger (72) and freezing heat-exchanger (84).

When [0174] defrosting of Figure 14 is turned round, set first four-way change-over valve (35) and the 3rd four-way change-over valve (37) for second state, set second four-way change-over valve (36) for first state.And air-conditioning expansion valve (61) and refrigeration expansion valve (71) are standard-sized sheet, and the aperture of freezing expansion valve (83) and outdoor expansion valve (34) is subjected to suitable adjusting.Second magnetic valve (SV2) of rudimentary side hot gas path (89) is closed.In this state, the running first fixed compressor reducer (31b) frequently, second fixed compressor reducer (31c) and the auxiliary compressor (85) frequently.

[0175] part that sprays cold-producing medium except the compressing mechanism (31) from outdoor unit (10) is from senior side hot gas path (46) and flow to refrigerator display case (13) this point by the first low pressure tracheae (42) from the 3rd four-way change-over valve (37), and cold-producing medium and state shown in Figure 7 similarly circulate at refrigerant loop (10).And, carry out being condenser, being the kind of refrigeration cycle of evaporimeter with freezing heat-exchanger (84) and outdoor heat converter (32) with heat exchanger of air condition (62) and refrigeration heat exchanger (72).

[0176]-second the effect of embodiment-

The refrigerating plant (10) of relevant this second embodiment, identical with first embodiment, the form of the defrosting running that the complicated while that can the restraining device structure is corresponding various.And, with the refrigeration heat exchanger is the existing refrigerating plant difference that thermal source defrosts to freezing heat-exchanger, because the good combination of heat absorption and heat radiation when not needing to consider refrigeration heat exchanger and freezing heat-exchanger and defrosting running and can not being restricted in design, this point is identical with first embodiment.

[0177] further, owing to use the heat that absorbed at heat exchanger of air condition (62) and outdoor heat converter (32) and defrost to refrigerating heat exchanger (72) and freezing heat-exchanger (84) at compressing mechanism (31) heat that compressed refrigerant obtained, therefore can carry out the good defrosting running of efficient, can not use the white rising that therefore can suppress storehouse temperature that electric heater melts attached to refrigeration heat exchanger (72) and freezing heat-exchanger (84) internally with the heat of cold-producing medium to wait these points also identical with first embodiment.

[0178] " the 3rd embodiment "

The refrigerating plant of the 3rd embodiment (10), be replace for outdoor unit (11) and be connected with each air-conditioning unit (12), refrigerator display case (13) and refrigerated display case (14) to be connected with an air-conditioning unit (12) and two freezing units (14) for outdoor unit (11) as shown in figure 15, get and generation.Two refrigerated display cases (14), by divide from first hydraulic fluid side contact pipe arrangement (21) inconsistent two freezing side difference liquid pipes (21b), with divide inconsistent two freezing side difference tracheaes (22b) to be parallel to outdoor unit (11) from first gas side contact pipe arrangement (22).In other words, among this 3rd embodiment, two refrigerating circuits (80) that will possess freezing heat-exchanger (84) and auxiliary compressor (85) are connected in parallel.

[0179] other structures and first embodiment are same.

[0180]-the running action-

In this 3rd embodiment, similarly can carry out the running of cold air operation and heating installation with first, second embodiment, and can be when cold air operation and heating installation running one or two freezing heat-exchangers (84) be defrosted.

[0181] during cold air operation, as shown in figure 16, sets first four-way change-over valve (35), second four-way change-over valve (36) and the 3rd four-way change-over valve (37) for first state respectively.And outdoor expansion valve (34) is a full cut-off, and the aperture of air-conditioning expansion valve (61) and freezing expansion valve (83) is subjected to suitable adjusting, and second magnetic valve (SV2) of rudimentary side hot gas path (89) is closed.In this state, start DC frequency conversion compressor reducer (31a), the first fixed compressor reducer (31b) frequently, second fixed compressor reducer (31c) and each auxiliary compressor (85) frequently.

[0182] with state shown in Figure 2 substantially in the same manner, cold-producing medium circulates at refrigerant loop (10).And, carry out being condenser, being the kind of refrigeration cycle of evaporimeter with heat exchanger of air condition (62) and freezing heat-exchanger (84) with outdoor heat converter (32).

[0183] running of the defrosting during cold air, can carry out the defrosting running of Figure 17 and the defrosting running of Figure 18, the defrosting of Figure 17 operates as simultaneously two freezing heat-exchangers (84) is defrosted, and the defrosting of Figure 18 operates as cools off and another freezing heat-exchanger (84) is defrosted one freezing heat-exchanger (84) wherein.

When [0184] defrosting of Figure 17 is turned round, set first four-way change-over valve (35) and second four-way change-over valve (36) for first state, and set the 3rd four-way change-over valve (37) for second state.And outdoor expansion valve (34) is a full cut-off, and each freezing expansion valve (83) is a standard-sized sheet, and the aperture of air-conditioning expansion valve (61) is subjected to suitable adjusting.First magnetic valve (SV1) of senior side hot gas path (46) is unlocked respectively with second magnetic valve (SV2) of rudimentary side hot gas path (89).In this state, the running first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently.

[0185] part that sprays cold-producing medium except the compressing mechanism (31) from outdoor unit (10) is diverted to two freezing side difference tracheaes (22b) from senior side hot gas path (46) after by the first low pressure tracheae (42) and flows to this point of each refrigerated display case (14), and cold-producing medium and state shown in Figure 3 similarly circulate in refrigerant loop (10).And, carry out being condenser, being the kind of refrigeration cycle of evaporimeter with heat exchanger of air condition (62) with outdoor heat converter (32) and each freezing heat-exchanger (84).

[0186] defrosting of Figure 18 operates as the example that defrosts at the refrigerated display case (14) as the figure upside.In the following description, this refrigerated display case (14) is called defrosting side showcase, and the refrigerated display case of figure downside is called the cold side showcase.

[0187] in Figure 18, set first four-way change-over valve (35) and second four-way change-over valve (36) for first state, set the 3rd four-way change-over valve (37) for second state.And outdoor expansion valve (34) is a full cut-off, and on the other hand, the freezing expansion valve (83) of cold side showcase and the aperture of air-conditioning expansion valve (61) are subjected to suitable adjusting, and the freezing expansion valve (83) of defrosting side showcase is a standard-sized sheet.First magnetic valve (SV1) of senior side hot gas path (46) is unlocked, second magnetic valve (SV2) of the rudimentary side hot gas path (89) of defrosting side showcase is unlocked, and second magnetic valve (SV2) of the rudimentary side hot gas path (89) of cold side showcase is closed.In this state, the auxiliary compressor (85) of the running first fixed compressor reducer (31b) frequently, the second fixed compressor reducer (31c) frequently and cold side showcase.

[0188] part that sprays cold-producing medium except the compressing mechanism (31) from outdoor unit (10) flows to by the first low pressure tracheae (42) back from senior side hot gas path (46) this point of freezing heat-exchanger (84) of defrosting side showcase, and cold-producing medium and state shown in Figure 4 similarly circulate in refrigerant loop (10).And, carry out freezing heat-exchanger (84) with outdoor heat converter (32) and defrosting side showcase and be condenser, be the kind of refrigeration cycle of evaporimeter with the freezing heat-exchanger (84) of heat exchanger of air condition (62) and cold side showcase.

When [0189] heating installation turns round, as shown in figure 19, set first four-way change-over valve (35) for second state respectively, and set second four-way change-over valve (36) and the 3rd four-way change-over valve (37) for first state.And air-conditioning expansion valve (61) is a standard-sized sheet, and the aperture of outdoor expansion valve (34) and each freezing expansion valve (83) is subjected to suitable adjusting.First magnetic valve (SV1) of senior side hot gas path (46) and second magnetic valve (SV2) of rudimentary side hot gas path (89) are closed.In this state, running DC frequency conversion compressor reducer (31a), the first fixed compressor reducer (31b) frequently, second fixed compressor reducer (31c) and each auxiliary compressor (85) frequently.

[0190] with state shown in Figure 5 substantially in the same manner cold-producing medium circulate at refrigerant loop (10).And, carry out being condenser, being the kind of refrigeration cycle of evaporimeter with outdoor heat converter (32) and freezing heat-exchanger (84) with heat exchanger of air condition (62).

[0191] and, when heating installation ability in the running that with outdoor heat converter (32) is evaporimeter is superfluous, in Figure 19 state, stop the second fixed compressor reducer (31c) frequently and seal outdoor expansion valve (34) simultaneously, cold-producing medium heat absorption in each freezing heat-exchanger (84), it is just passable to turn round in the state of refrigerant loses heat in heat exchanger of air condition (62).

[0192] and, when the heating installation ability is superfluous, second four-way change-over valve (36) is converted to second state simultaneously outdoor expansion valve (34) is converted to standard-sized sheet turn round (the second fixed compressor reducer (31c) is frequently stopped), with outdoor heat converter (32) is condenser, unnecessary heat is rejected to outdoor just passable.

Defrosting running during [0193] as heating installation, can carry out the defrosting running of Figure 20 and the defrosting running of Figure 21, the defrosting of Figure 20 operates as simultaneously two freezing heat-exchangers (84) is defrosted, and the defrosting of Figure 21 operates as cools off and another freezing heat-exchanger (84) is defrosted one freezing heat-exchanger (84) wherein.

When [0194] defrosting of Figure 20 is turned round, set first four-way change-over valve (35) and the 3rd four-way change-over valve (37) for second state, and set second four-way change-over valve (36) for first state.And air-conditioning expansion valve (61) and each freezing expansion valve (83) are standard-sized sheet, and the aperture of outdoor expansion valve (34) is subjected to suitable adjusting.First magnetic valve (SV1) of senior side hot gas path (46) and second magnetic valve (SV2) of rudimentary side hot gas path (89) are for opening.In this state, the running first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently.

[0195] part of the cold-producing medium that is sprayed except the compressing mechanism (31) from outdoor unit (10) is diverted to two freezing side difference tracheaes (22b) from senior side hot gas path (46) after by the first low pressure tracheae (42) and flows to this point of each refrigerated display case (14), and cold-producing medium and state shown in Figure 6 similarly circulate at refrigerant loop (10).And, carry out being condenser, being the kind of refrigeration cycle of evaporimeter with outdoor heat converter (32) with heat exchanger of air condition (62) and each freezing heat-exchanger (84).

[0196] defrosting of Figure 21 operates as, the example that defrosts at the refrigerated display case (14) as the figure upside.During this defrosting running, set first four-way change-over valve (35) and the 3rd four-way change-over valve (37) for second state, set second four-way change-over valve (36) for first state.And the freezing expansion valve (83) of cold side showcase and the aperture of outdoor expansion valve (34) are subjected to suitable adjusting, and the freezing expansion valve (83) of air-conditioning expansion valve (61) and defrosting side showcase is a standard-sized sheet.First magnetic valve (SV1) of senior side hot gas path (46) is a standard-sized sheet, second magnetic valve (SV2) of the rudimentary side hot gas path (89) of defrosting side showcase is for opening, and second magnetic valve (SV2) of the rudimentary side hot gas path (89) of cold side showcase is for cutting out.In this state, the auxiliary compressor (85) of the running first fixed compressor reducer (31b) frequently, the second fixed compressor reducer (31c) frequently and cold side showcase.

[0197] part of the cold-producing medium that is sprayed except the compressing mechanism (31) from outdoor unit (10) flows to by the first low pressure tracheae (42) back from senior side hot gas path (46) this point of freezing heat-exchanger (84) of defrosting side showcase, and cold-producing medium and state shown in Figure 7 similarly circulate at refrigerant loop (10).And, carry out freezing heat-exchanger (84) with heat exchanger of air condition (62) and defrosting side showcase and be condenser, be the kind of refrigeration cycle of evaporimeter with the freezing heat-exchanger (84) and the outdoor heat converter (32) of cold side showcase.

[0198]-the 3rd the effect of embodiment-

The refrigerating plant of relevant the 3rd embodiment (10), with the one the second embodiment similarly, the form of corresponding diversified defrosting running of complicated while that can the restraining device structure.Particularly, just make arbitrary freezing heat-exchanger (84) in two when defrosting, can cool off at another freezing heat-exchanger (84).And the heat absorption that makes refrigeration heat exchanger and freezing heat-exchanger when having avoided considering the defrosting running is with the heat radiation good combination and to causing this point of restriction identical with first, second embodiment in the design.

[0199] further, owing to can use the heat that absorbed at heat exchanger of air condition (62) or outdoor heat converter (32) and come freezing heat-exchanger (84) is defrosted at compressing mechanism (31) heat that compressed refrigerant obtained, therefore can carry out the good defrosting running of efficient, or the rising of not using electric heater to melt internally with the heat of cold-producing medium can to suppress storehouse temperature attached to the frost of freezing heat-exchanger (84) etc., these aspects are also identical with first, second embodiment.

[0200] " the 4th embodiment "

The refrigerating plant of the 4th embodiment (10), substantially the same with refrigerant loop (20) structure of above-mentioned first embodiment, still, different aspect the action of defrosting running.

[0201] in this example, in the defrosting running of freezing heat-exchanger (84), behind auxiliary compressor (85) cold-producing medium that further compressing mechanism (31) of discharge chambe external loop (30) is sprayed, will spray cold-producing medium and supply to freezing heat-exchanger (84).Specifically, the cold-producing medium that the compressing mechanism (31) in outdoor loop (30) is sprayed, a part is fed into freezing heat-exchanger (84) by rudimentary side hot gas path (89), other a part is after auxiliary compressor (85) is compressed, cold-producing medium interflow with the above-mentioned compressor structure (31) that flows through rudimentary side hot gas path (89) is fed into freezing heat-exchanger (84).

[0202] in defrosting running, a part of liquid of the cold-producing medium that condenses at freezing heat-exchanger (84) injects auxiliary compressor (85).

Among [0203] the 4th embodiment, hot gas is imported path (46,89) be divided into first and import the path (96) and the second importing path (97), first imports path (96) imports auxiliary compressor (85) for the gas refrigerant that the compressing mechanism (31) with outdoor loop (30) is sprayed, and second imports path (97) imports cooling heat exchanger (84) for the gas refrigerant that auxiliary compressor (85) is sprayed.Second imports compressing mechanism (31) and the cooling heat exchanger (84) (second imports path (97) for comprising the path of rudimentary side hot gas path (89)) that path (97) is connected with outdoor loop (30).On the other hand, first imports path (96) goes out to connect auxiliary compressor (85) for importing path (97) difference from second, the part importing auxiliary compressor (85) of the gas refrigerant that is sprayed with the compressing mechanism (31) with outdoor loop (30).And,, be connected with the bleed pipe (98) of auxiliary compressor (85) in above-mentioned second compressing mechanism (31) one sides that import the outdoor loop (30) of path (97).

[0204] in this 4th embodiment, the branch pipe (86) that connects the low-pressure side stream (81b) of refrigerant heat exchanger (81) constitutes liquid and injects path (99), and liquid injects the part importing auxiliary compressor (85) that path (99) be a liquid refrigerant that the defrosting running of freezing heat-exchanger (84) is flowed out from cooling heat exchanger (84).

[0205]-the running action-

The running action of relevant the 4th embodiment will illustrate that the defrosting to freezing heat-exchanger (84) is turned round when cold air operation.

Running (the second defrosting running) that the refrigerating plant of [0206] the 4th embodiment (10), the defrosting shown in Figure 3 of changing first embodiment turn round (the first defrosting running) and Figure 22 described later defrosts.These two defrosting runnings are changed according to the detected temperatures of the heat-exchanger temperature sensor that is arranged at freezing heat-exchanger (84) (90).

[0207] in this refrigerating plant (10), carries out the first defrosting running usually as Fig. 3.This first defrosting running, as mentioned above, except the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently of operation office for train receiving departure external loop (30), DC frequency conversion compressor reducer (31a) and auxiliary compressor (85) are halted state, and carry out refrigeration heat exchanger (72) and freezing heat-exchanger (84) are defrosted.

[0208] on the other hand, if if in this first defrosting running the defrosting scarce capacity of freezing heat-exchanger (84), the defrosting required time of freezing heat-exchanger (84) when elongated, is then carried out the second following defrosting running.

[0209] specifically, in the above-mentioned first defrosting running, when the detected temperatures of heat-exchanger temperature sensor (90) is difficult to rise to set point of temperature, then judge the defrosting scarce capacity of freezing heat-exchanger (84).As a result, shifting from the first defrosting running is the second defrosting running.

[0210] in the second defrosting running, turn round similarly with first defrosting, in refrigerant loop (20), set first four-way change-over valve (35) and second four-way change-over valve (36) for first state, the 3rd four-way change-over valve (37) is set second state for.And, outdoor expansion valve (34) full cut-off, refrigeration expansion valve (71) and freezing expansion valve (83) they are standard-sized sheet, the aperture of air-conditioning expansion valve (6 1) is subjected to suitable adjusting.And, open first magnetic valve (SV1) of senior side hot gas path (46) and second magnetic valve (SV2) of rudimentary side hot gas path (89).In this state, the running first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently.Simultaneously, the aperture of injecting the electric expansion valve (87) of path (99) branch pipe (86) as liquid is adjusted, and starts auxiliary compressor (85).

[0211] at this state, the cold-producing medium that the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) are frequently sprayed, by each bleed pipe (48b, 48c), be sent to outdoor heat converter (32) by first tracheae (50) from first four-way change-over valve (35) at high-pressure air pipe (45) interflow.In outdoor heat converter (32), cold-producing medium condenses to the outdoor air heat radiation.The cold-producing medium that condenses at outdoor heat converter (32) behind first hydraulic fluid side contact pipe arrangement (21) by receiver (33), flow into second hydraulic fluid side contact pipe arrangement (23).

[0212] on the other hand, the part of the cold-producing medium that the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) are frequently sprayed, from senior side hot gas path (46) the first low pressure tracheae (42) and first gas side contact pipe arrangement (22) of flowing through, and be diverted to refrigeration side difference tracheae (22a) and freezing side difference tracheae (22b).

[0213] flow to the cold-producing medium that refrigerates side difference tracheae (22a), flow into refrigeration heat exchanger (72) air heat radiation in the storehouse and condense.At this moment, the frost attached to refrigeration heat exchanger (72) is melted.At the cold-producing medium that condenses of refrigeration heat exchanger (72), flow into refrigeration side difference liquid pipe (21a) by refrigeration expansion valve (71) and flow into second hydraulic fluid side contact pipe arrangement (23) and cold-producing medium interflow from outdoor unit (11).

[0214] flows to the cold-producing medium of freezing side difference tracheae (22b), import path (97) by comprising second of rudimentary side hot gas path (89), a part flows into freezing heat-exchanger (84), and other parts then import path (96) by first and are inhaled into auxiliary compressor (85).

[0215] at the compressed cold-producing medium of auxiliary compressor (85), is sent to rudimentary side hot gas path (89), the cold-producing medium interflow that is sprayed with the compressing mechanism (31) in above-mentioned outdoor loop (30) by bleed pipe (98).And, flow into freezing heat-exchanger (84) at the cold-producing medium at rudimentary side hot gas path (89) interflow.In other words, in refrigerating circuit (80), the part of cold-producing medium is compressed simultaneously at auxiliary compressor (85) and circulates, and the input heat of auxiliary compressor (80) will be supplied to cold-producing medium.

[0216] in freezing heat-exchanger (84), cold-producing medium air heat radiation in the storehouse is condensed.At this moment, the frost attached to freezing heat-exchanger (84) is melted.The cold-producing medium that condenses at freezing heat-exchanger (84), freezing side difference liquid pipe (21b) by freezing expansion valve (83), drip pan heater (82) and refrigerant heat exchanger (81) flows into second hydraulic fluid side contact pipe arrangement (23), with the cold-producing medium interflow from outdoor unit (11).

When [0217] this second defrosting is turned round, owing to be compressed in the part of the compressed cold-producing medium of compressing mechanism (31) of outdoor loop (30) further at auxiliary compressor (85), therefore if continue this running, the temperature of the ejection cold-producing medium of auxiliary compressor (85) will obviously rise and may become the reason of fault.Therefore, the refrigerating plant among the 4th embodiment (10) in order to prevent the fault of auxiliary compressor (85), injects action and carry out liquid.

[0218] specifically, second when running defrosting, the aperture of regulating electric expansion valve (87) in response to the ejection refrigerant temperature of auxiliary compressor (85).And for example when the temperature of ejection cold-producing medium is higher than setting, the aperture of electric expansion valve (87) will become big.As a result, the part of the cold-producing medium that condenses at freezing heat-exchanger (84) is sent to auxiliary compressor (85) by the branch pipe (86) that injects path (99) as liquid.Therefore, the cold-producing medium that is inhaled into auxiliary compressor (85) is cooled off, and can prevent that the temperature anomaly of the ejection cold-producing medium of auxiliary compressor (85) from rising.

[0219] on the other hand, the cold-producing medium at second hydraulic fluid side contact pipe arrangement (23) interflow is fed into air conditioner loop (60).Thereafter action is identical with Fig. 3 example.In other words, flow into the cold-producing medium of air conditioner loop (60), be imported into heat exchanger of air condition (62) after being reduced pressure during by air-conditioning expansion valve (61).In heat exchanger of air condition (62), cold-producing medium is from room air heat absorption evaporation.In air-conditioning unit (12), the room air that is cooled off at heat exchanger of air condition (62) is fed in the shop.Cold-producing medium in heat exchanger of air condition (62) evaporation, flow into outdoor loop (30) by second gas side contact pipe arrangement (24), in regular turn by behind first four-way change-over valve (35) and second four-way change-over valve (36), be inhaled into the first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently from second tracheae (51) from the second low pressure tracheae (44), second suction line (41b) and the 3rd suction line (41c).The first fixed compressor reducer (31b) frequently and the second fixed compressor reducer (31c) frequently compress the cold-producing medium that is sucked and are ejected into second bleed pipe (48b) and the 3rd bleed pipe (48c).

[0220] as mentioned above, in the defrosting running of Figure 22, the heat that use is absorbed at indoor heat converter (62) and at the compressor (31b of outdoor loop (30), 31c) and auxiliary compressor (85) heat that compressed refrigerant obtained of refrigerating circuit (80), can defrost to refrigeration heat exchanger (72) and freezing heat-exchanger (84) simultaneously.And, also can carry out the running identical with Fig. 4, also can seal the running that refrigeration expansion valve (71) only carries out the defrosting of freezing heat-exchanger (84).

[0221] and, the explanation of the defrosting running of the freezing heat-exchanger (84) during relevant heating installation running is omitted.

[0222]-the 4th the effect of embodiment-

This 4th embodiment except can obtain with the same effect of first embodiment, also

Has following effect.

[0223] in other words, among this 4th embodiment, can change the first defrosting running and the second defrosting running, when the defrosting scarce capacity of freezing heat-exchanger (84) in the first defrosting running, second defrosting of the auxiliary compressor (85) that also can turn round is turned round.Therefore, if according to the 4th embodiment, can improve the heat of the second defrosting running cold-producing medium that gives, and can improve defrosting ability freezing heat-exchanger (84).Therefore, can effectively defrost according to the second defrosting running to freezing heat-exchanger (84).

[0224] and, among above-mentioned the 4th embodiment,, inject, and can prevent the ejection refrigerant temperature abnormal ascending of secondary side compressor (85) owing to carry out liquid to auxiliary compressor (85) in the second defrosting running, positively protect auxiliary compressor (85).

[0225]-the 4th the variation of embodiment-

Above-mentioned the 4th embodiment presses in the middle of the auxiliary compressor (85) position to be connected with as liquid and injects path (99) branch pipe (86), still, this branch pipe (86) also can connect auxiliary compressor (8) suction line first import path (96).

[0226] and, at above-mentioned the 4th embodiment, inject owing to carry out liquid, the ejection temperature of auxiliary compressor (85) can abnormal ascending, but can replace this liquid injection with the running capacity of control auxiliary compressor (85) yet.The abnormal ascending that so, can suppress auxiliary compressor (85) ejection temperature.

[0227] " the 5th embodiment "

The refrigerating plant of the 5th embodiment (10), as shown in figure 23, different with a part of structure of the refrigerant loop (20) of the refrigerating plant (10) of first embodiment, the structure that hot gas imports path (100,102) is also changed.Below, the difference of the 5th embodiment and first embodiment mainly is described.And,, omitted sensor and so at present embodiment.

Among [0228] the 5th embodiment, unit outside the relative chamber (11), though the figure of high pressure ingress pipe (47) does not as shown in Figure 1 show, but, for the high-pressure with refrigerant loop (20) imports the 4th valve port (P4) of the 3rd four-way change-over valve (37), therefore be provided with identical with first embodiment.

[0229] in refrigerated display case (14), refrigerant heat exchanger (81) is not set, the gas side pipe arrangement of freezing heat-exchanger (84) (110 (88)) connects the suction side of auxiliary compressor (85).Bleed pipe (98) in auxiliary compressor (85) is provided with oil eliminator (120), is connected with the have capillary oil return pipe (122) of (121) between the suction line (111) of this oil eliminator (120) and auxiliary compressor (85).And,, the circuitous pipe arrangement (125) of walking around auxiliary compressor (85) such as be connected with when auxiliary compressor (85) fault at the suction line (111) of auxiliary compressor (85) and bleed pipe (98).Be provided with non-return valve (CV10) at this circuitous pipe arrangement (125).

[0230] as the feature of the 5th embodiment, different with first embodiment, hot gas imports path (100) and is not respectively equipped with senior side and rudimentary side, and by the bleed pipe (high-pressure air pipe) (45) of the compressing mechanism that has connected outdoor unit (11) (31), and a pipe arrangement of the pipe arrangement (110) of the gas side of freezing heat-exchanger (84) constituted.Import path (100) at this hot gas and be provided with electric expansion valve (101) as the flow guiding mechanism.

[0231] and, have more than is hot gas to be imported path (100) connect freezing heat-exchanger (84), shown in Figure 23 dotted line, import path (100) at above-mentioned hot gas the pipe arrangement (112) that is also connected the gas side of refrigeration heat exchanger (72) by branch pipe (hot gas importing path) (102) is set, and switching mechanisms (103) such as triple valve also can be set, switching mechanisms (103) such as this triple valve can change or select thermal current to freezing heat-exchanger (84) and thermal current to refrigeration heat exchanger (72).So, can be to refrigeration heat exchanger (72) and freezing heat-exchanger (84) both defrost simultaneously or to wherein one defrost.Therefore, with the various embodiments described above similarly, can defrost individually to each heat exchanger (72,84), and corresponding diversified defrosting running form.

During [0232] for example to the defrosting running of freezing heat-exchanger (84), the part of the cold-producing medium that is sprayed from the compressing mechanism (31) of outdoor unit (11) hot gas of flowing through imports path (100) and is imported into freezing heat-exchanger (84).In freezing heat-exchanger (84), the frost that the warm thawing of high-pressure refrigerant is adhered to.Thereafter, cold-producing medium is inhaled into above-mentioned compressor structure (31) in refrigeration heat exchanger (72), heat exchanger of air condition (62) or outdoor heat converter (32) evaporation.In this situation, then refrigerant flow was many when electric expansion valve (101) was standard-sized sheet, therefore can consider: the frost attached to freezing heat-exchanger (84) dissolves around coil quickly, to drop on the commodity from coil and around it, melt the white piece that stays, but, if adjust the flow of cold-producing medium by the aperture of regulating above-mentioned electric expansion valve (101), then can around coil, frost be melted gradually, and prevent that white piece from dropping on the commodity.

[0233] and, when the cold air operation of the 5th embodiment and the action and the various embodiments described above in heating installation when running roughly the same, omit its explanation here.

[0234] " other embodiment "

Relevant the foregoing description can be following structure.

[0235] for example, be that example describes to connect one air-conditioning unit (12), refrigerator display case (13) and refrigerated display case (14) respectively among first, second embodiment, but also can suitably change the platform number of air-conditioning unit (12), refrigerator display case (13) and refrigerated display case (14).

[0236] and, the example that makes the outer unit (11) of an air-conditioning unit (12) and two refrigerated display cases (14) junction chamber has been described among the 3rd embodiment, still, also can make refrigerated display case (14) is more than three.

[0237] and, though, when carrying out the air-conditioning in shop, also air-conditioning unit (12) can be set at the refrigerating plant (10) of each embodiment with special air conditioner at wherein arbitrary embodiment of first～the 3rd embodiment.

[0238] and, though be in the various embodiments described above with three compressors (31a, 31b, 31c) constitute the compressing mechanism (31) of outdoor unit (11), but, also can change the platform number of compressor, be one and under the situation that air-conditioning unit (12) are not set, also can make compressor.

[0239] and, above-mentioned the 4th embodiment improves the effect of defrosting running by use auxiliary compressor (85) among first embodiment when freezing heat-exchanger (84) being defrosted running, same idea also can be useful in second embodiment and the 3rd embodiment.And, among the 4th embodiment, when the second defrosting running, also the part of the ejection cold-producing medium of the compressing mechanism (31) of outdoor unit (11) can be supplied to freezing heat-exchanger (84), and other part of refrigerant are supplied to auxiliary compressor (85) and make the cold-producing medium circulation simultaneously, but, after also the ejection cold-producing medium of above-mentioned compressor structure (31) whole can being supplied to auxiliary compressor (85) and being compressed, supply to freezing heat-exchanger (84).

[0240] and, above embodiment is preferable in essence example, is not intention restriction the present invention, application of the present invention or purposes scope of the present invention.

Industrial applicibility

[0241] as above-mentioned explanation, the present invention is very useful for following refrigerating plant: just Refrigerating plant with refrigerant loop of steam compression type refrigerating circulation, this refrigerant loop Be by be in series with in the outdoor loop that is provided with outdoor heat converter and compressing mechanism have respectively cold But the cooling circuit of a plurality of systems of heat exchanger consists of, and this refrigerating plant is at least one The cooling circuit auxiliary compressor of individual system is in series with cooling heat exchanger.

Claims (14)

1. refrigerating plant, this refrigerating plant possesses the refrigerant loop (20) that carries out the steam compression type refrigerating circulation, this refrigerant loop (20) is to have cooling heat exchanger (72 respectively by being connected in parallel in the outdoor loop (30) that is provided with outdoor heat converter (32) and compressing mechanism (31), the cooling circuit (70 of a plurality of systems 84), 80) constitute, in the cooling circuit (80) of at least one system, auxiliary compressor (85) and cooling heat exchanger (84) are connected in series, it is characterized in that:

Have hot gas and import path (46,89) (100,102), this hot gas importing path (46,89) (100,102) optionally imports many cooling heat exchangers (72 with the ejection gas refrigerant of the compressing mechanism (31) of outdoor loop (30), 84) at least one, and possessing the defrosting path (25) that can defrost and turn round, this defrosting path (25) is carried out kind of refrigeration cycle with above-mentioned cooling heat exchanger (72,84) as condenser.

2. refrigerating plant according to claim 1 is characterized in that:

Be connected in parallel to first cooling circuit (70) that possesses first cooling heat exchanger (72) and have second cooling heat exchanger (84) and second cooling circuit (80) of auxiliary compressor (85) in outdoor loop (30).

3. refrigerating plant according to claim 1 is characterized in that:

Be connected in parallel to many cooling circuits (80) of possess cooling heat exchanger (84) and auxiliary compressor (85) in outdoor loop (30).

4. refrigerating plant according to claim 1 is characterized in that:

Be connected with air heat exchanger loop (60) in outdoor loop (30), this air heat exchanger loop (60) has the air heat exchanger (62) of regulating air themperature;

It constitutes described refrigerating plant and can carry out the first defrosting running and second defrosting is turned round, the first defrosting running is with cooling heat exchanger (72,84) be evaporimeter for condenser with air heat exchanger (62), the second defrosting running is evaporimeter for condenser with outdoor heat converter (32) with cooling heat exchanger (72,84).

5. refrigerating plant according to claim 1 is characterized in that:

Hot gas imports path (46,89) and has possessed senior side hot gas path (46) and rudimentary side hot gas path (89); Bleed pipe (45) and each cooling circuit (70 of the compressing mechanism (31) of senior side hot gas path (46) junction chamber external loop (30), the parent tube (42) of low pressure tracheae 80), when the defrosting running, allow cold-producing medium to flow to each cooling heat exchanger (72,84) from the bleed pipe (45) of above-mentioned compressor structure (31); The bleed pipe (22b) of rudimentary side hot gas path (89) auxiliary connection compressor (85) and suction line (88) allow cold-producing medium to flow to the cooling heat exchanger (84) that connects this auxiliary compressor (85) from the bleed pipe (22b) of auxiliary compressor (85) when the defrosting running.

6. refrigerating plant according to claim 5 is characterized in that:

This refrigerating plant possesses: as the compressing mechanism (31) of outdoor loop (30) and first compressor (31a), second compressor (32b) and the 3rd compressor (31c) that are connected in parallel, the four-way change-over valve (37) that connects the suction side of this compressing mechanism (31), be located at the senior side switch valve (SV1) of senior side hot gas path (46), and the rudimentary side switch valve (SV2) of being located at rudimentary side hot gas path (89);

The suction line (41a) of first compressor (31a) is by first valve port (P1) of non-return valve (CV1) connection four-way change-over valve (37), and this non-return valve (CV1) is forbidden this first compressor (31a) of refrigerant flow direction;

The suction line (41b) of second compressor (32b) connects second valve port (P2) of four-way change-over valve (37);

The suction line (41c) of the 3rd compressor (31c) is by the 3rd valve port (P3) of non-return valve (CV2) connection four-way change-over valve (37), and this non-return valve (CV2) is forbidden refrigerant flow direction the 3rd compressor (31c);

The high pressure ingress pipe (47) that is communicated with the high-voltage tube of compressing mechanism (31) connects the 4th valve port (P4) of four-way change-over valve (37);

Senior side hot gas path (46) connects the suction line (41a) of first compressor (31a);

It constitutes first state that can convert to and second state four-way change-over valve (37), first state is communicated with the 3rd valve port (P3) and the 4th valve port (P4) simultaneously for being communicated with first valve port (P1) and second valve port (P2), and second state is communicated with second valve port (P2) and the 3rd valve port (P3) simultaneously for being communicated with first valve port (P1) and the 4th valve port (P4).

7. refrigerating plant according to claim 5 is characterized in that:

This refrigerating plant possesses: as the compressing mechanism (31) of outdoor loop (30) and first compressor (31a), second compressor (32b) and the 3rd compressor (31c) that are connected in parallel, connect the four-way change-over valve (37) of the suction side of this compressing mechanism (31), and the rudimentary side switch valve (SV2) of being located at rudimentary side hot gas path (89);

The suction line (41a) of first compressor (31a) connects first valve port (P1) of four-way change-over valve (37);

The suction line (41b) of second compressor (32b) connects second valve port (P2) of four-way change-over valve (37);

The suction line (41c) of the 3rd compressor (31c) is by the 3rd valve port (P3) of non-return valve (CV2) connection four-way change-over valve (37), and this non-return valve (CV2) is forbidden refrigerant flow direction the 3rd compressor (31c);

Senior side hot gas path (46) connects the 4th valve port (P4) of four-way change-over valve (37);

It constitutes first state that can convert to and second state four-way change-over valve (37), first state is communicated with second valve port (P2) and the 3rd valve port (P3) simultaneously for being communicated with first valve port (P1) and the 4th valve port (P4), and second state is communicated with the 3rd valve port (P3) and the 4th valve port (P4) simultaneously for being communicated with first valve port (P1) and second valve port (P2).

8. refrigerating plant according to claim 1 is characterized in that:

Hot gas imports path (46,89) and possesses the first importing path (96) and the second importing path (97); First imports path (96) makes the ejection gas refrigerant of the compressing mechanism (31) of outdoor loop (30) import auxiliary compressor (85); Second imports path (97) makes the ejection gas refrigerant of auxiliary compressor (85) import cooling heat exchanger (84).

9. refrigerating plant according to claim 8 is characterized in that:

Second imports the compressing mechanism (31) and the cooling heat exchanger (84) of path (97) junction chamber external loop (30); And

First imports path (96) imports path (97) difference and goes out auxiliary connection compressor (85) from second, makes the part of ejection gas refrigerant of compressing mechanism (31) of outdoor loop (30) import auxiliary compressor (85);

Be connected with the bleed pipe (98) of auxiliary compressor (85) in above-mentioned second compressing mechanism (31) one sides that import the outdoor loop (30) of path (97).

10. refrigerating plant according to claim 9 is characterized in that:

Have liquid and inject path (99), the part that this liquid injects the liquid refrigerant that path (99) will flow out from cooling heat exchanger (84) imports auxiliary compressor (85).

11. refrigerating plant according to claim 9 is characterized in that:

Auxiliary compressor (85) is made of frequency-changeable compressor.

12. refrigerating plant according to claim 1 is characterized in that:

At least one pipe in the pipe arrangement (110,112) of the bleed pipe (45) of the compressing mechanism (31) of the direct junction chamber external loop (30) of hot gas importing path (100,102) and the gas side of cooling heat exchanger (72,84).

13. refrigerating plant according to claim 12 is characterized in that:

Hot gas imports path (100,102) be connected with bleed pipe (45) and many cooling heat exchangers (72 of the compressing mechanism (31) of outdoor loop (30), the pipe arrangement (110 of gas side 84), 112), this refrigerating plant possesses the switching mechanism (103) that can change or select many cooling heat exchangers (72,84).

14. refrigerating plant according to claim 12 is characterized in that:

Import path (100,102) at hot gas and be provided with flow guiding mechanism (101).

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