CN101196357A - Refrigeration system - Google Patents

Abstract

The invention provides a refrigeration system which not only avoids the high-load operation of the system, but also remain the refrigeration capability and operation efficiency without any obstacle. The refrigeration system (1) comprises a capability-controllable compressor (37), a condenser (38), an expansion valve (44) and an evaporator (43), which form a refrigeration loop, wherein, the control device having the capability-controllable compressor (37) and the expansion valve (44) (a refrigerator controller (32) and a refrigeration casing controller (50), and etc.) adjusts the open degree of the expansion valve (44) so as to remain the over-heat degree of the refrigeration agent inside the evaporator (43) in a fixed value, and reduces open degree of the expansion valve (44) so as to rise the over-heat degree of the expansion valve (44) when the pressure at the high-pressure side rises to a predetermined protection value according to the pressure at the high-pressure side of the refrigeration loop.

Description

Refrigeration system

The application be that August 27, application number in 2004 are 200410057988.1 the applying date, denomination of invention divides an application for the application for a patent for invention of " refrigeration system ".

Technical field

For example the present invention relates in shop etc., be used to cool off the refrigeration system of cooling in the storehouse of storage facilities.

Background technology

In the past, (indoor) carries out air conditioner by air conditioner in the shop in the shop of convenience store etc.In addition, the refrigeration of gondola sales commodity or the showcase (cooling storage facilities) of freezing open Showcase or band door are set in the shop, these carry out cooling off in the storehouse (with reference to patent documentation 1) by refrigerator.

[patent documentation 1] spy opens the 2002-174470 communique

But as mentioned above, evaporimeter in the storehouse of cooling showcase etc. and compressor or condenser (these are arranged on the refrigerator), expansion valve (decompressor) constitute refrigerant loop jointly.In addition, compressor can carry out volume controlled by control operating frequency etc., and simultaneously, expansion valve constitutes by the electric expansion valve that can adjust valve opening, and the degree of superheat of cold-producing medium that will be in evaporimeter is controlled to be necessarily.

Therefore, under the situation of the cooling abundance in the storehouse, because expansion valve reduces valve opening, the low-pressure lateral pressure of refrigerant loop reduces gradually.If this low-pressure lateral pressure is average lower situation, then the COP of compressor reduces, and running efficiency worsens.Therefore in the past, the setting value of regulation is set on the low-pressure lateral pressure of refrigerant loop, upper and lower settings higher limit and lower limit in this setting value, drop under the situation of the lower limit in above-mentioned higher limit and the lower limit at low-pressure lateral pressure, the operating frequency of compressor is descended, capacity is reduced, control to the direction of the valve opening expansion that makes expansion valve.

Like this, if low-pressure lateral pressure rises to higher limit, then improved the operating frequency (capacity) of compressor, but because in the past, the setting value of this low-pressure lateral pressure is certain, so there is following problems, promptly, become the situation of changing operating frequency (capacity) continually, low-pressure lateral pressure is on average lower, and running efficiency is low.

On the other hand, for example if refrigerant loop sinks into higher load condition, then because of the high side pressure abnormal ascending, so the high pressure tripper is set in this kind system.This high pressure tripper makes compressor stop under the high pressure that the high side pressure of refrigerant loop reaches regulation opens circuit the situation of setting value forcibly, protection system, but if compressor stops, and then cooling also stops in the storehouse of showcase etc.

Therefore,, in the past, reached relevant high pressure at high side pressure and opened circuit stage before the setting value, adopt to reduce the countermeasure of the capacity (for example, reducing operating frequency) of compressor as eluding game.But the reduction of compressor capacity still can cause the deficiency of cooling capacity.

The present invention forms in order to solve relevant technical task in the past, a kind of refrigeration system is provided, this refrigeration system can be eliminated the degradation in efficiency that the reduction because of the low-pressure lateral pressure of refrigerant loop causes effectively, like this, the high loaded process that provides a kind of one side to avoid system, one side can be kept the refrigeration system of cooling capacity and running efficiency without barrier.

Summary of the invention

The present invention is a kind of refrigeration system; have compressor, condenser, expansion valve and the evaporimeter that can carry out volume controlled; constitute refrigerant loop, have the control device of control compressor and expansion valve, this control device is adjusted the valve opening of expansion valve; the degree of superheat that makes the cold-producing medium in evaporimeter is for certain; simultaneously, according to the high side pressure of refrigerant loop, rise at this high side pressure under the situation of protection setting value of regulation; reduce the valve opening of expansion valve, the degree of superheat is risen.

The refrigeration system of the invention of technical scheme 2; it is characterized in that; in above-mentioned; control device has the high pressure tripper; this high pressure tripper is under the high pressure that high side pressure reaches regulation opens circuit the situation of setting value; the running of compressor is stopped, and simultaneously, the protection setting value is to open circuit than high pressure to set value low value.

The refrigeration system of the invention of technical scheme 3 is characterized in that, in above-mentioned each invention, control device reduces the valve opening of expansion valve, be reduced to below the specified standard value until high side pressure, after high side pressure was reduced to below the standard value, recovering to make the degree of superheat was certain control.

The refrigeration system of the invention of technical scheme 4, it is characterized in that, in technical scheme 1 or technical scheme 2, control device reduces the valve opening of expansion valve, be reduced to below the specified standard value until high side pressure, under high side pressure is reduced to state below the standard value, under the situation that high side pressure descends, the expansive valve aperture, simultaneously, in the process of the valve opening of expanding this expansion valve gradually, under the situation more than the setting of the rising degree of high side pressure arrival regulation, keep the valve opening of expansion valve, under this state, under the situation that high side pressure descends, after the valve opening of expansion expansion valve, recovering to make the degree of superheat is certain control.

The present invention is a kind of refrigeration system, has the compressor that can carry out volume controlled, condenser, expansion valve and evaporimeter, constitute refrigerant loop, control device with control compressor, upper and lower settings higher limit and lower limit in the setting value of stipulating, this control device is according to the low-pressure lateral pressure of refrigerant loop, drop under the situation of the lower limit in above-mentioned higher limit and the lower limit at low-pressure lateral pressure, the capacity of compressor is descended, rising under the situation of higher limit, the capacity of compressor is risen, simultaneously, deviation according to the design temperature in the actual temperature in the space that is cooled by evaporator cools and this space that is cooled changes above-mentioned setting value.

The refrigeration system of the invention of technical scheme 6, it is characterized in that, in above-mentioned, control device is higher than under the situation of design temperature with the actual temperature in the space that is cooled, reduce above-mentioned setting value, and the direction that be lower than under the situation of design temperature in the actual temperature in the space that is cooled, improves above-mentioned setting value changes this setting value.

The refrigeration system of the invention of technical scheme 7 is characterized in that, in above-mentioned each invention, control device makes above-mentioned setting value turn back to the low value of predesignating after the defrosting of evaporimeter finishes.

The refrigeration system of the invention of technical scheme 8 is characterized in that, in above-mentioned, the duration of runs of the compressor after control device finishes according to defrosting, above-mentioned setting value is risen.

The refrigeration system of the invention of technical scheme 9, it is characterized in that, in above-mentioned, control device is that the duration of runs of compressor is short more, the ascensional range of above-mentioned setting value is increased, reach in the duration of runs of compressor under the situation of stipulated time, be transformed into change control above-mentioned setting value based on above-mentioned deviation.

The present invention is a kind of refrigeration system, a plurality of compressors with connection arranged side by side, condenser, expansion valve and evaporimeter, constitute refrigerant loop, control device with control compressor, upper and lower settings higher limit and lower limit in the setting value of stipulating, this control device is according to the low-pressure lateral pressure of refrigerant loop, drop under the situation of the lower limit in higher limit and the lower limit at low-pressure lateral pressure, the capacity of compressor is descended, rising under the situation of higher limit, the capacity of compressor is being risen, simultaneously, according to the mean value of each low-pressure lateral pressure of fixing time and the deviation of setting value, change setting.

The invention of technical scheme 11 is in above-mentioned, and control device is lower than under the situation of above-mentioned setting value at above-mentioned mean value, and setting value is risen.

The invention of technical scheme 12 is in above-mentioned, according to the state of cooling by the space that is cooled of evaporator cools, is taking place under the not enough situation of cooling above-mentioned setting value to be reduced.

Invention according to technical scheme 12, on above-mentioned basis, because according to the state of cooling by the space that is cooled of evaporator cools, taking place under the not enough situation of cooling, above-mentioned setting value is reduced, thus can be according to the state of cooling in the space that is cooled, the control of the direction of the capacity of the early stage reduction of change compressor, because can revise, so can keep the state of cooling in the space that is cooled without barrier to the direction of slow reduction capacity.

The invention of technical scheme 13 is in above-mentioned, have a plurality of evaporimeters and by the situation in the space that is cooled of its cooling under, control device is selected the most not enough space that is cooled of cooling, the state of cooling according to this space that is cooled, setting value is reduced, simultaneously, the selection in the specific space that is cooled is under the situation of remarkable state, retains the record of relevant this be cooled space and/or its corresponding evaporimeter.

Invention according to technical scheme 14, with above-mentioned evaporimeter as refrigeration and/or freezingly use with evaporimeter, and, constitute the idle call refrigerant loop by compressor, utilize the side heat exchanger, expansion valve, outdoor heat converter that use as idle call, simultaneously, this idle call refrigerant loop and above-mentioned refrigerant loop are connected in series, constitute the heat extraction that makes this refrigerant loop and in above-mentioned idle call refrigerant loop, can utilize.

The present invention is a kind of refrigeration system, a plurality of compressors, condenser, the expansion valve that can adjust valve opening and evaporimeter with connection arranged side by side, constitute refrigerant loop, control device with control above-mentioned compressor and expansion valve, this control device is adjusted the valve opening of above-mentioned expansion valve, the degree of superheat that makes the cold-producing medium in above-mentioned evaporimeter is for certain, simultaneously, low-pressure lateral pressure according to above-mentioned refrigerant loop, setting value by regulation, the capacity of above-mentioned compressor is reduced, and, change above-mentioned setting value according to the valve opening of above-mentioned expansion valve.

The invention of technical scheme 16 is in above-mentioned, and control device rises above-mentioned setting value, thereby the valve opening that makes above-mentioned expansion valve is near standard-sized sheet.

The invention of technical scheme 17 is to exist under a plurality of evaporimeters and the situation of its corresponding above-mentioned expansion valve in above-mentioned, the above-mentioned expansion valve of above-mentioned control device selector valve aperture maximum, change above-mentioned setting value according to this valve opening, simultaneously, selection at specific expansion valve is under the situation of remarkable state, retains the record of relevant this expansion valve and/or its corresponding evaporimeter.The invention of technical scheme 18 is that at least 1 in above-mentioned a plurality of compressor is the compressor of volume-variable formula.

The invention of technical scheme 19 is as refrigeration and/or freezingly use with evaporimeter with above-mentioned evaporimeter, and, constitute the idle call refrigerant loop by compressor, utilize the side heat exchanger, expansion valve, outdoor heat converter that use as idle call, simultaneously, this idle call refrigerant loop and above-mentioned refrigerant loop are connected in series, and constitute the heat extraction that makes this refrigerant loop and can utilize in above-mentioned idle call refrigerant loop.

The effect of invention

In the present invention; refrigeration system has the compressor that can carry out volume controlled; condenser; expansion valve and evaporimeter; constitute refrigerant loop; wherein; control device with control compressor and expansion valve; because this control device is adjusted the valve opening of expansion valve; the degree of superheat that makes the cold-producing medium in evaporimeter is for certain; simultaneously; according to the high side pressure of refrigerant loop, rise at this high side pressure under the situation of protection setting value of regulation, reduce the valve opening of expansion valve; the degree of superheat is risen; so when high loaded process, rise to moment of protection setting value, reduce the valve opening of expansion valve at the high side pressure of refrigerant loop; can be reduced in the evaporating temperature of the cold-producing medium in the evaporimeter, that seeks to load alleviates.

In view of the above; for example as the control device of technical scheme 2 under situation with high pressure tripper; this high pressure tripper is under the high pressure that high side pressure reaches regulation opens circuit the situation of setting value; the running of compressor is stopped; be set at than the high pressure low value of setting value that opens circuit by protecting, can avoid forcing to stop the situation of compressor because of the high pressure tripper.

In addition, by reducing the valve opening of expansion valve, the refrigerating capacity of refrigerator is reduced, but increase because of the evaporating temperature of the cold-producing medium in evaporimeter with by the temperature difference of the temperature in the space that is cooled of its cooling, because the cooling capacity in evaporimeter increases, so the reduction of the cooling capacity of reality can be suppressed at Min., to avoid high loaded process.Particularly when high loaded process, because the COP of refrigeration system also reduces, so also can be by the reduction that suppresses running efficiency that alleviates of load.

In addition, according to control device as the invention of technical scheme 3, if reduce the valve opening of expansion valve, be reduced to below the specified standard value until high side pressure, after high side pressure is reduced to below the standard value, it is certain control that recovery makes the degree of superheat, then by fairly simple control, can reach above-mentioned effect.

On the other hand, according to control device as the invention of technical scheme 4, by carrying out following control, promptly reduce the valve opening of expansion valve, be reduced to below the specified standard value until high side pressure, under high side pressure is reduced to state below the standard value, under the situation that high side pressure descends, the expansive valve aperture, simultaneously, in the process of the valve opening of expanding this expansion valve gradually, under the situation below the setting of the rising degree of high side pressure arrival regulation, keep the valve opening of expansion valve, under this state, under the situation that high side pressure descends, after the valve opening of expansion expansion valve, it is certain control that recovery makes the degree of superheat, can precision avoid high loaded process well.

In the present invention, because refrigeration system has the compressor that can carry out volume controlled, condenser, expansion valve and evaporimeter, constitute refrigerant loop, wherein, control device with control compressor, upper and lower settings higher limit and lower limit in the setting value of stipulating, this control device is according to the low-pressure lateral pressure of refrigerant loop, drop under the situation of the lower limit in above-mentioned higher limit and the lower limit at low-pressure lateral pressure, the capacity of compressor is descended, rising under the situation of higher limit, the capacity of compressor is risen, simultaneously, deviation according to the design temperature in the actual temperature in the space that is cooled by evaporator cools and this space that is cooled, change above-mentioned setting value, so pass through in following direction, promptly, for example under as the actual temperature in the space that is cooled of technical scheme 2 situation higher than design temperature, reduce above-mentioned setting value, under the actual temperature in the space that the is cooled situation lower, improve the direction of above-mentioned setting value than design temperature, change this setting value, the actual temperature that can make the space that is cooled is postponed the reduction of compressor capacity under high state, keep the refrigerating capacity of refrigeration system.

On the other hand, fully cool off in the space that is cooled, expansion valve reduces valve opening, under the situation that the low-pressure lateral pressure of refrigerant loop reduces gradually,, the capacity of compressor is reduced in the stage more early, control to the direction of the valve opening that enlarges expansion valve, can promote the rising of low-pressure lateral pressure.In view of the above, can eliminate the problem that the low-pressure lateral pressure of refrigerant loop on average reduces, improve the COP of compressor, the running efficiency of refrigeration system is improved.

In addition, as the invention of technical scheme 7, by after the defrosting end of evaporimeter, make above-mentioned setting value turn back to the low value of predesignating, the rapid load after can correspondingly defrosting rises.

In addition, in the invention of technical scheme 8, be in above-mentioned, because according to the duration of runs of the compressor after the defrosting end, above-mentioned setting value is risen, so it is short more by for example the duration of runs as the compressor of technical scheme 5, the ascensional range of above-mentioned setting value is increased, reach in the duration of runs of compressor under the situation of stipulated time, be transformed into change control to above-mentioned setting value based on above-mentioned deviation, can simultaneously shorten the drop-down required time after defrosting finishes, one side seeks to improve running efficiency.

According to a kind of refrigeration system of the present invention, because have a plurality of compressors of connection arranged side by side, condenser, expansion valve and evaporimeter, constitute refrigerant loop, control device with control compressor, upper and lower settings higher limit and lower limit in the setting value of stipulating, this control device is according to the low-pressure lateral pressure of refrigerant loop, drop under the situation of the lower limit in higher limit and the lower limit at low-pressure lateral pressure, the capacity of compressor is descended, rising under the situation of higher limit, the capacity of compressor is risen, simultaneously, according to the mean value of each low-pressure lateral pressure of fixing time and the deviation of setting value, change setting, so be lower than under the situation of setting value by for example mean value as the low-pressure lateral pressure of technical scheme 2, setting value is risen, and the commitment of the process that can descend gradually at the low-pressure lateral pressure of refrigerant loop reduces to the capacity that makes compressor, the direction that enlarges the valve opening of expansion valve is controlled, and promotes the rising of low-pressure lateral pressure.

In view of the above, can eliminate the problem that the low-pressure lateral pressure of refrigerant loop on average reduces, improve the COP of compressor, the running efficiency of refrigeration system is improved.

Invention according to technical scheme 12, because be on above-mentioned basis, according to the state of cooling by the space that is cooled of evaporator cools, taking place under the not enough situation of cooling, above-mentioned setting value is reduced, thus can be according to the state of cooling in the space that is cooled, the control of the direction of the capacity of the early stage reduction of change compressor, because can revise, so can keep the state of cooling in the space that is cooled without barrier to the direction of slow reduction capacity.

Invention according to technical scheme 13, because be on above-mentioned basis, have a plurality of evaporimeters and by the situation in the space that is cooled of its cooling under, control device is selected the most not enough space that is cooled of cooling, the state of cooling according to this space that is cooled, setting value is reduced, so can guarantee the cooling capacity in the space that needs most cooling in a plurality of spaces that are cooled.In addition, because the selection in the specific space that is cooled is under the situation of remarkable state, retain the record of relevant this be cooled space and/or its corresponding evaporimeter, so can help the bad improvement of the state of cooling.

Invention according to technical scheme 14, because be on above-mentioned basis, with above-mentioned evaporimeter as refrigeration and/or freezingly use with evaporimeter, and, pass through compressor, that uses as idle call utilizes the side heat exchanger, expansion valve, outdoor heat converter constitutes the idle call refrigerant loop, simultaneously, this idle call refrigerant loop and above-mentioned refrigerant loop are connected in series, constituting the heat extraction that makes this refrigerant loop can utilize in above-mentioned idle call refrigerant loop, so carrying out heating installation when running by the idle call refrigerant loop, can effectively utilize with of the heat extraction of above-mentioned evaporimeter as refrigeration and/or the freezing above-mentioned refrigerant loop that uses with evaporimeter.

According to a kind of refrigeration system of the present invention, because have a plurality of compressors of connection arranged side by side, condenser, can adjust the expansion valve and the evaporimeter of valve opening, constitute refrigerant loop, control device with control compressor and expansion valve, this control device is adjusted the valve opening of expansion valve, the degree of superheat that makes the cold-producing medium in evaporimeter is for certain, simultaneously, low-pressure lateral pressure according to refrigerant loop, by the setting value of regulation, the capacity of compressor is reduced, and according to the valve opening of expansion valve, change setting, so for example by setting value is risen, thereby make valve opening as the expansion valve of technical scheme 2, the commitment of the process that can reduce gradually at the low-pressure lateral pressure of refrigerant loop near standard-sized sheet, the capacity of compressor is reduced, control to the direction of the valve opening that enlarges expansion valve.

In view of the above, can eliminate the problem that the low-pressure lateral pressure of refrigerant loop reduces on the whole, improve the COP of compressor, the running efficiency of refrigeration system is improved.

Invention according to technical scheme 17, because be on the basis of the above, under the situation that has a plurality of evaporimeters and its corresponding expansion valve, the expansion valve of control device selector valve aperture maximum, according to this valve opening change setting, so can guarantee the cooling capacity of the evaporimeter that needs most cooling in a plurality of evaporimeters.In addition, because be under the situation of remarkable state, retain the record of relevant this expansion valve and/or its corresponding evaporimeter, so can help the bad improvement of the state of cooling in the selection of specific expansion valve.

According to the invention of technical scheme 18, because be on the basis of the above, be the capacity continuous variable of compressor, so can be with respect to the trickle change of load, with the most appropriate capacity movement system.

Invention according to technical scheme 19, because be on the basis of the above, be as refrigeration and/or freezingly use with above-mentioned evaporimeter with evaporimeter, and, pass through compressor, that uses as idle call utilizes the side heat exchanger, expansion valve, outdoor heat converter constitutes the idle call refrigerant loop, simultaneously, this idle call refrigerant loop and above-mentioned refrigerant loop are connected in series, constituting the heat extraction that makes this refrigerant loop can utilize in above-mentioned idle call refrigerant loop, so carrying out heating installation when running by the idle call refrigerant loop, can effectively utilize with of the heat extraction of above-mentioned evaporimeter as refrigeration and/or the freezing above-mentioned refrigerant loop that uses with evaporimeter.

Description of drawings

Fig. 1 is the figure that constitutes of the system of the explanation refrigerant loop that comprises the refrigeration system that the is suitable for embodiments of the invention cold air operation of the air conditioner (time).

Fig. 2 is the figure of heating installation running of the air conditioner of the explanation refrigeration system that is suitable for embodiments of the invention.

Fig. 3 is that the heat release in the heat exchangers in series of the cooling device of explanation when the heating installation running of the air conditioner of the refrigeration system that is suitable for embodiments of the invention is the figure of the running under the unwanted situation almost.

The specific embodiment

Below, with reference to the accompanying drawings, be described in detail embodiments of the present invention.Fig. 1 is the figure that system's formation of the refrigerant loop that comprises the refrigeration system 1 that is suitable for embodiments of the invention is described.The refrigeration system 1 of embodiment is to realize cooling off the air-conditioning in for example indoor 2 () of convenience store and as the material of (space is cooled) in the storehouse of (space is cooled) or household freezer 4 in the storehouse of many refrigerating boxes 3,3 of the cooling storage facilities of setting there in the shop in.

In addition, refrigerating box 3 is provided with the 1st～the 6 six refrigerating box 3 in an embodiment, but in the accompanying drawings, only represents the mat woven of fine bamboo strips 1 and the 2 two refrigerating box 3,3.In addition, these refrigerating boxes 3,3, household freezer 4 is except being the open Showcase of front or end face opening, also be by transparent glass door can the freely openable opening the showcase of sealing, be cooled to refrigerated storage temperature (+3 ℃～+ 10 ℃) in the storehouse of each refrigerating box 3,3, the chilled food of display beverage or sandwich etc., simultaneously, be cooled to cryogenic temperature (10 ℃～-20 ℃) in the storehouse of household freezer 4, the cold spot of display frozen food or ice cream etc.

In the figure, Reference numeral 6 is the air conditioners (air-conditioning system) with idle call refrigerant loop 7, and Reference numeral 8 is to be used to cool off have the cooling device (cooling storage facilities system) of cooling storage facilities with refrigerant loop 9 in the storehouse of above-mentioned refrigerating box 3,3 or household freezer 4.Air conditioner 6 is to constitute by being arranged on indoor set 11,11 on indoor 2 the roof etc. and the outdoor unit 12 that is arranged on outside the shop, and between them, pipe arrangement constitutes idle call refrigerant loop 7.

This idle call refrigerant loop 7 is by 2 compressors (rotor compressor) 13A in the outer vanning that is arranged on outdoor unit 12 (carrying out the FREQUENCY CONTROL running by converter), 13B (constant speed drive), check valve 5A, 5B, oil eliminator 10, cross valve 14, heat source side heat exchanger 16, expansion valve (decompressor that constitutes by the electric expansion valve that can adjust valve opening) 17,18,19, heat exchanger 21 in parallel, check valve 22, accumulator 23 etc., what be arranged on indoor set 11 sides utilizes side heat exchanger 27,27 systematically constitute (air-conditioning system).

Reference numeral 26 is according to temperature or pressure, is used to control the outdoor controller (be the controller that constitutes air-conditioning system control device, be made of general micro computer) of machine of outdoor unit 12 sides of air conditioner 6, is arranged on the outdoor unit 12.In addition, Reference numeral 24 is the pressure fans that are used for outer gas is vented to heat source side heat exchanger 16, be arranged on outdoor unit 12 in heat source side heat exchanger 16 corresponding positions on.This outdoor controller 26 has high pressure cut-out function (high pressure tripper), under the high pressure that the high side pressure of idle call refrigerant loop 7 rises to regulation opens circuit the situation of setting value, pressure stops compressor 13A and 13B, under the situation of the answer setting value that drops to regulation, allow its running.In addition, this high pressure cut-out function also can be by constituting for dividing other individual high pressure tripper with outdoor controller 26.Reference numeral 28 is according to temperature or pressure, the indoor set controller of machine that is used to control indoor set 11 sides of air conditioner 6 (is the controller that constitutes air-conditioning system control device, constitute by general micro computer), be separately positioned on (side is diagram not) on the indoor set 11.

In addition, Reference numeral the 15, the 15th is used for air draught with indoor 2 (in the shops) to the pressure fan that utilizes side heat exchanger 27,27, be arranged on respectively with indoor set 11 in utilize on side heat exchanger 27, the 27 corresponding positions.

Compressor 13A and 13B mutually side by side connect, and the discharge side of each compressor 13A, 13B is respectively by check valve 5A, 5B interflow, are connected on a side the inlet of cross valve 14 (direction of each its cross valve 14 of check valve 5A, 5B for along direction).In addition, a side's of cross valve 14 outlet is connected with the inlet of heat source side heat exchanger 16.This heat source side heat exchanger 16 is to be made of flow path resistance smaller entrance side 16A and outlet side 16B, and this entrance side 16A is that the pipe arrangement arranged side by side by majority constitutes, and this outlet side 16B intensively is the pipe arrangement arranged side by side of minority or the pipe arrangement of odd number with these.And the outlet of the outlet side 16B of this heat source side heat exchanger 16 is connected with the inlet of expansion valve 18 by expansion valve 17, and the outlet of expansion valve 18 is connected on the inlet that respectively utilizes side heat exchanger 27,27 to each indoor set 11 shuntings.

The outlet that respectively utilizes side heat exchanger 27,27 spreads all over outdoor unit 12 behind the interflow, be connected with the opposing party's of cross valve 14 inlet, and the opposing party's of cross valve 14 outlet is connected with accumulator 23 by check valve 22.Like this, the outlet of this accumulator 23 is connected the suction side of compressor 13A, 13B.In addition, check valve 22 its accumulator 23 sides are along direction.

In addition, the pipe arrangement between the expansion valve 17 and 18 is connected the inlet of expansion valve 19, and the outlet of expansion valve 19 is connected the inlet of the air-conditioning side path 21A of heat exchanger 21 in parallel.The outlet of the air-conditioning side path 21A of this parallel connection heat exchanger 21 is connected the suction side of compressor 13A, 13B by accumulator 23.

On the other hand, cooling device 8 spreads all between the refrigerating box 3,3 and household freezer 4 that is arranged at above-mentioned outdoor unit 12 and indoor 2 (in the shops), and pipe arrangement constitutes cooling storage facilities refrigerant loop 9.This cooling storage facilities is by the 1st compressor (screw compressor) 37 in the outer vanning that is arranged on outdoor unit 12 with refrigerant loop 9, condenser (heat exchanger) 38,2 cross valves 39,41 (constituting the stream control device) by these 2 cross valves, check valve 42, oil eliminator 31, fluid reservoir 36 etc., be arranged on refrigerating box 3, on 3, difference cooling refrigeration case 3, refrigeration in 3 storehouse evaporimeter 43,43, expansion valve (can adjust the electric expansion valve of valve opening) 44,44, magnetic valve 46,46,47, check valve 48 (constituting the refrigerating system of the part of cooling storage facilities system), be arranged on the household freezer 4 the freezing evaporimeter 49 of using in the storehouse of cooling household freezer 4, expansion valve (can adjust the electric expansion valve of valve opening) 51, magnetic valve 52,53, the 2nd compressor (rotor compressor) 54, check valve 30 and oil eliminator 45 formations such as (constituting the refrigeration system of the part of cooling storage facilities system).

Reference numeral 32 is according to temperature or pressure, and the refrigerator controller of the machine of outdoor unit 12 sides of control cooling device 8 (be the controller that constitutes cooling storage facilities system control device, be made of general micro computer) is arranged on the outdoor unit 12.This refrigerator controller 32 has high pressure cut-out function (high pressure tripper), the high pressure that this high pressure cut-out function rises to regulation at the cooling storage facilities with the high side pressure HP of refrigerant loop 9 opens circuit and sets value under the situation of HP1, pressure stops compressor 37 and 54, under the situation of the answer setting value that drops to regulation, allow its running.In addition, this high pressure cut-out function also can be by constituting for dividing other individual high pressure tripper with refrigerator controller 32.In addition, Reference numeral 35 is the pressure fans that are used for outer gas is vented to condenser 38, is arranged on the condenser 38 corresponding positions with outdoor unit 12.In addition, Reference numeral 50 is according to temperature or pressure, the refrigerating box controller of the machine of control refrigerating box 3,3 sides (be the controller that constitutes cooling storage facilities system control device, be made of general micro computer) is separately positioned on (side is diagram not) on the refrigerating box 3,3.In addition, by this refrigerating box controller 50 and above-mentioned refrigerator controller 32, constitute the control device among the present invention.Have, Reference numeral 55 is according to temperature or pressure again, and the household freezer controller of the machine of control household freezer 4 sides (be the controller that constitutes cooling storage facilities system control device, be made of general micro computer) is arranged on the household freezer 4.Also have,, constitute the control device among the present invention by this refrigerating box controller 50 or household freezer controller 55 and above-mentioned refrigerator controller 32.

In addition, Reference numeral the 20, the 20th is used for cold air in the storehouse of each refrigerating box 3,3 to refrigeration with the pressure fan that evaporimeter 43,43 ventilates, be separately positioned on and refrigerating box 3,3 in each refrigeration with evaporimeter 43,43 corresponding positions.Reference numeral 25 is to be used for cold air in the storehouse of household freezer 4 to the freezing pressure fan that ventilates with evaporimeter 49, be arranged on household freezer 4 in freezing with evaporimeter 49 corresponding positions.

The discharge side of compressor 37 is connected by oil eliminator 31 on a side the inlet of cross valve 39, and a side's of this cross valve 39 outlet is connected on the inlet of condenser 38.This condenser 38 is to be made of flow path resistance smaller entrance side 38A and outlet side 38B, and this entrance side 38A is that the pipe arrangement arranged side by side by majority constitutes, and this outlet side 38B intensively is the pipe arrangement arranged side by side of minority or the pipe arrangement of odd number with these.And the outlet of the outlet side 38B of this condenser 38 is connected on the inlet of fluid reservoir 36, and the outlet of this fluid reservoir 36 is connected on a side the inlet of cross valve 41.

Like this, a side's of cross valve 41 outlet is connected on the inlet of case side path 21B of heat exchanger 21 in parallel.In addition, heat exchanger 21 in parallel is the parts that make respectively by the mutual heat exchange of cold-producing medium of the air-conditioning side path 21A that constitutes in inside and case side path 21B, in view of the above, low-pressure side and the cooling storage facilities with idle call refrigerant loop 7 carries out thermal bonding with the high-pressure side of refrigerant loop 9.

The outlet of the case side path 21B of heat exchanger 21 in parallel is connected on the opposing party's the inlet of cross valve 39, and the opposing party's of this cross valve 39 outlet is connected on the opposing party's the inlet of cross valve 41.Like this, the opposing party's of this cross valve 41 outlet branches into from outdoor unit 12, and enters into indoor 2 (in the shops).One side's of branch the further branch of pipe arrangement, its side who branches out by magnetic valve 47,46, are connected on the inlet of expansion valve 44 successively, and the outlet of expansion valve 44 is connected the refrigeration of the 1st refrigerating box 3 with on the inlet of evaporimeter 43.The opposing party is connected on the inlet of expansion valve 44 by magnetic valve 46, and the outlet of expansion valve 44 is connected the refrigeration of the 2nd refrigerating box 3 with on the inlet of evaporimeter 43.

The opposing party's of 2 () in the inlet chamber and branch pipe arrangement is connected on the inlet of expansion valve 51 by magnetic valve 52 in the shop in, and the outlet of expansion valve 51 is connected on the freezing usefulness inlet of evaporimeter 49.In addition, magnetic valve 53 is connected side by side with the loop in upright arrangement of magnetic valve 52 and expansion valve 51.

Check valve 30 is passed through in freezing outlet with evaporimeter 49, is connected the suction side (check valve 30 its compressor 54 sides are suitable direction) of compressor 54.The little compressor of output that this compressor 54 is a ratio piston compressor 37, it discharges side by oil eliminator 45, is connected the suction side of compressor 37.That is, compressor 37 and compressor 54 in upright arrangement connection on refrigerant loop.In addition, refrigeration behind the interflow, is connected the outlet side of oil eliminator 45 of the discharge side of compressor 54 with the outlet of evaporimeter 43,43.In addition, check valve 48 is connected nearby and between the magnetic valve 46,47 of check valve 30 of compressor 54, and magnetic valve 46,47 directions are along direction.Have again, check valve 42 be connected the suction side of compressor 37 and the pipe arrangement that comes out from oil eliminator 31 between, oil eliminator 31 directions are along direction.And, in refrigerant loop 7,9, enclose for example R-410A of ormal weight, the cold-producing medium of R-404A etc.

By above formation, the action of refrigeration system 1 of the present invention is described.In addition, above-mentioned compressor 37 and 13A are by converter, control its operating frequency (volume controlled), and compressor 13B and compressor 54 are compressors of constant speed drive.In addition, the action of refrigeration system 1 integral body is to control by the master controller (main control unit) 56 that is made of general micro computer.

Here, but master controller 56 is connected communicatedly with above-mentioned outdoor controller 26, indoor set controller 28, refrigerator controller 32, refrigerating box controller 50 and household freezer controller 55 data, receives the data of collecting about present operating condition from each controller.Then, according to the data that receive, determine the most appropriate operation mode at this time point described later, data that will be relevant with this most appropriate operation mode and each the operation of a machine data are sent to outdoor controller 26, indoor set controller 28, refrigerator controller 32, refrigerating box controller 50 and household freezer controller 55.Outdoor controller 26, indoor set controller 28, refrigerator controller 32, refrigerating box controller 50 and household freezer controller 55 are carried out control action described later according to data and each the operation of a machine data of the relevant the most appropriate operation mode of receiving from master controller 56.

(1) the most appropriate operation mode 1: the cold air operation of air conditioner (Fig. 1)

At first, in summer etc., master controller 56 judges under the most appropriate situation of the cold air operation of air conditioners 6, and the data of the most appropriate relevant operation mode 1 are sent to outdoor controller 26, indoor set controller 28, refrigerator controller 32, refrigerating box controller 50 and household freezer controller 55.

According to the data of receiving, outdoor controller 26 makes an above-mentioned side's of cross valve 14 inlet be communicated with a side outlet, and the opposing party's inlet is communicated with the opposing party's outlet.In addition, expansion valve 17 is a standard-sized sheet.Then, running compressor 13A, 13B.In addition, outdoor controller 26 is adjusted the operating frequency of compressor 13A, carries out ability control.

If compressor 13A, 13B running, then the gaseous refrigerant of the HTHP of discharging from the discharge side of compressor 13A, 13B enters into the entrance side 16A of heat source side heat exchanger 16 through cross valve 14.By pressure fan 24, ventilate to outer gas on this heat source side heat exchanger 16, cold-producing medium is heat release here, condensation liquefaction.That is, the heat source side heat exchanger 16 under this situation is as condenser performance function.Through outlet side 16B, 16B's this liquid refrigerant comes out from this outlet side from the entrance side 16A of heat source side heat exchanger 16.Like this, passing through expansion valve 17 back branches.One side of branch arrives expansion valve 18, and throttling becomes (decompression) after the low pressure there, and branch flow into and respectively utilizes side heat exchanger 27,27, evaporates there.

Utilize on the side heat exchanger 27,27 at this, by pressure fan 15,15, by the air draught in indoor 2 (in the shops), the heat-absorbing action that the evaporation by cold-producing medium produces, indoor 2 air is cooled.In view of the above, carry out the refrigeration in indoor 2 (in the shops).From the gaseous refrigerant that utilizes the low temperature that side heat exchanger 27,27 comes out behind the interflow, from the outlet of the opposing party's of cross valve 14 inlet by the opposing party, pass through check valve 22, accumulator 23 successively, be inhaled into the circulation of the suction side of compressor 13A, 13B repeatedly.Indoor set controller 28 is according to the temperature of utilizing side heat exchanger 27,27 or the temperature of inhaled air there, and as design temperature, control is to the pressure fan 15,15 that utilizes side heat exchanger 27,27 to ventilate with the temperature in indoor 2 (in the shops).Information from indoor set controller 28 is sent to master controller 56, and outdoor controller 26 is controlled the running of compressor 13A, 13B according to this information.

The opposing party of cold-producing medium by expansion valve 17 back branches arrives expansion valve 19, and throttling becomes (decompression) after the low pressure there, flow into the air-conditioning side path 21A of heat exchanger 21 in parallel, evaporates there.The heat-absorbing action that the evaporation of the cold-producing medium by relevant idle call refrigerant loop 7 produces, heat exchanger 21 in parallel is cooled, and becomes low temperature.The gaseous refrigerant of the low temperature that comes out from heat exchanger 21 in parallel is drawn into the circulation of the suction side of compressor 13A, 13B repeatedly through accumulator 23.

Outdoor controller 26 is according to the refrigerant temperature of the gateway that utilizes side heat exchanger 27,27, or utilize the refrigerant temperature of the gateway of the temperature of side heat exchanger 27,27 and heat exchanger in parallel 21, or the temperature of heat exchanger 21 in parallel, adjust the valve opening of expansion valve 18 and 19, make it to become the appropriate degree of superheat.

On the other hand, the cooling storage facilities that refrigerator controller 32 makes cooling device 8 is communicated with a side outlet with an above-mentioned side's of the cross valve 39 of refrigerant loop 9 inlet, makes the opposing party's inlet be communicated with the opposing party's outlet.In addition, make an above-mentioned side's of cross valve 41 inlet be communicated with a side outlet, make the opposing party's inlet be communicated with the opposing party's outlet.And, running compressor 37 and compressor 54.The gaseous refrigerant of the HTHP of discharging from compressor 37 enters into the entrance side 38A of condenser 38 after oil eliminator 31 separating oil through cross valve 39.This condenser 38 also is by pressure fan 35 outer gas to be ventilated, and flow into the cold-producing medium heat release there of condenser 38, condensation gradually.

The cold-producing medium of entrance side 38A by this condenser 38 arrives outlet side 38B, goes out therefrom.The cold-producing medium that comes out from condenser 38 enters in this fluid reservoir 36 from the entrance side of fluid reservoir 36, there in case store, just carries out gas/liquid and separates.The liquid refrigerant that separates comes out from the outlet of fluid reservoir 36, by behind the cross valve 41, enters the case side path 21B of heat exchanger 21 in parallel.Enter into the cold-producing medium of the cooling storage facilities of this case side path 21B with refrigerant loop 9, be cooled by heat exchanger 21 in parallel, further strengthened the supercooling state, this parallel connection heat exchanger 21 as mentioned above, the evaporation of the cold-producing medium by idle call refrigerant loop 7 becomes low temperature.

Passing through cross valve 39, cross valve 41 back branches successively by these parallel connection heat exchanger 21 overcooled cold-producing mediums, one side is branch further, one side is successively by magnetic valve 47,46, arrive expansion valve 44, there by (decompression) after the throttling, the refrigeration that flows into the 1st refrigerating box 3 is evaporated there with evaporimeter 43.In addition, the opposing party of branch arrives expansion valve 44 by magnetic valve 46, and there by (decompression) after the throttling, the refrigeration that flows into the 2nd refrigerating box 3 is evaporated there with evaporimeter 43.By pressure fan 20,20, in each refrigeration with on evaporimeter 43,43, air in the storehouse of the circulation refrigerating box 3,3 that ventilates respectively, the heat-absorbing action that the evaporation by cold-producing medium produces, air is cooled in each storehouse.In view of the above, carry out cooling in the storehouse of refrigerating box 3,3.The gaseous refrigerant of the low temperature that comes out with evaporimeter 43,43 from refrigeration behind the interflow, the outlet side of the oil eliminator 45 of arrival compressor 54.

From come out the opposing party of cold-producing medium of branch of heat exchanger 21 in parallel, by magnetic valve 52, arrive expansion valve 51, there by (decompression) after the throttling, flows into freezing usefulness evaporimeter 49, evaporate there.By pressure fan 25, freezing at this also is the air in the storehouse of circulating frozen case 4 that ventilates respectively on evaporimeter 49, the heat-absorbing action that the evaporation by cold-producing medium produces, and air is cooled in the storehouse.In view of the above, carry out cooling in the storehouse of household freezer 4.

From the gaseous refrigerant of the freezing low temperature that comes out with evaporimeter 49 through check valve 30, arrive compressor 54, be compressed there, boost to refrigeration with behind the outlet side pressure (low-pressure lateral pressure of refrigerating system) of evaporimeter 43,43, discharge from compressor 54, after oil eliminator 45 separating oil, with the cold-producing medium interflow of using evaporimeter 43,43 from refrigeration.Carry out the circulation that cold-producing medium behind this interflow is inhaled into the suction side of compressor 37 repeatedly.

Like this, because low-pressure side cold-producing medium by idle call refrigerant loop 7 mobile in the air-conditioning side path 21A of heat exchanger 21 in parallel, can carry out supercooling with the high-pressure side cold-producing medium of refrigerant loop 9 to the cooling storage facilities, so the cooling capacity in the evaporimeter 43,43,49 of refrigerating box 3,3 or household freezer 4 and cool off storage facilities and be improved with the running efficiency of refrigerant loop 9.In addition, because the evaporating temperature of the cold-producing medium that utilizes side heat exchanger 27 of the idle call refrigerant loop 7 of air conditioner 6 raises, so also can seek the improvement of the running efficiency of idle call refrigerant loop 7.In addition, because in this case, the cooling storage facilities passes through condenser 38 with the on high-tension side cold-producing medium of refrigerant loop 9, flows to the case side path 21B of heat exchanger 21 in parallel, so also the degree of superheat of idle call refrigerant loop 7 can be maintained suitable scope.

In addition, from the pressure of cooling storage facilities with the freezing cold-producing medium that comes out with evaporimeter 49 of refrigerant loop 9, because its evaporating temperature reduces, so than using evaporimeter 43 from refrigerating, 43 cold-producing mediums that come out are low, but since with from refrigeration with evaporimeter 43, before the 43 cold-producing medium interflow of coming out, boosted by compressor 54 compressions, so can simultaneously pass through each evaporimeter 43,43,49, difference is cooling refrigeration case 3 swimmingly, 3 and the storehouse of household freezer 4 in, one side adjustment is inhaled into the pressure of cooling storage facilities with the cold-producing medium of the compressor 37 of refrigerant loop 9, thereby turns round without barrier.

(2-1) change of the setting value of low-pressure lateral pressure control

Here, the temperature that cold air temperature that cold air temperature that refrigerating box controller 50 is discharged with evaporimeter 43,43 according to the storehouse temperature (actual temperature in the space that is cooled) of refrigerating box 3,3 or through refrigeration or refrigeration suck with evaporimeter 43,43 and refrigeration are used evaporimeter 43 with the refrigerant temperature or the refrigeration of the outlet side of evaporimeter 43 is adjusted the valve opening of each expansion valve 44,44 respectively.In view of the above, one side maintains above-mentioned refrigerated storage temperature with cooling in the storehouse of each refrigerating box 3,3, and it is appropriate value (degree of superheat is certain) that one side makes in each degree of superheat that refrigerates with the cold-producing medium in the evaporimeter 43,43.

That is, the storehouse temperature rising at refrigerating box 3 needs under the situation of cooling, and refrigerating box controller 50 enlarges the valve opening of using evaporimeter 43 corresponding expansion valves 44 with the refrigeration of this refrigerating box 3, makes cold-producing medium flow to refrigeration more with in the evaporimeter 43.In addition, the storehouse temperature reduction at refrigerating box 3 under the situation that not too needs to cool off, reduces the valve opening of expansion valve 44, cuts down cold-producing medium to the influx of refrigeration with evaporimeter 43.In view of the above, the storehouse temperature of each refrigerating box 3,3 is controlled at design temperature respectively, to remain on necessarily in the degree of superheat of refrigeration simultaneously with the cold-producing medium in the evaporimeter 43, and, under situation about need not cool off (for example, be lower than the lower limit temperature of the regulation also lower and situation about reducing is inferior at storehouse temperature than design temperature), final plant closure expansion valve 44.

In addition, household freezer controller 55 is adjusted the valve opening of expansion valve 51 according to the storehouse temperature of household freezer 4 or through freezing cold air temperature or freezing cold air temperature and freezing refrigerant temperature or the freezing temperature with evaporimeter 49 of using the outlet side of evaporimeter 49 of using the suction of evaporimeter 49 of discharging with evaporimeter 49.In view of the above, one side maintains above-mentioned cryogenic temperature with cooling in the storehouse of household freezer 4, and one side is the appropriate degree of superheat (degree of superheat is certain).In addition, the control of expansion valve 51 is identical with above-mentioned expansion valve 43.

Refrigerator controller 32 is according to the low-pressure lateral pressure LP of cooling storage facilities with refrigerant loop 9, the operating frequency (capacity) of control compressor 37.In this case, on refrigerator controller 32, stipulate to have the setting value of the low-pressure lateral pressure of predesignating.In addition, certain poor of having up and down of this setting value, capping value and lower limit, the low-pressure lateral pressure LP with refrigerant loop 9 is reduced under the situation of above-mentioned lower limit at the cooling storage facilities, makes the operating frequency of compressor 37 be reduced to low frequency.

Like this, low-pressure lateral pressure LP with refrigerant loop 9 is reduced under the situation of lower limit at the cooling storage facilities, reduce by the operating frequency that makes compressor 37, owing to reduced influx from the cold-producing medium of evaporimeter 43 to the refrigeration of refrigerating box 3 that use, so cooling capacity also reduces.In view of the above, because refrigerating box controller 50 is controlled at the direction of the valve opening expansion that makes expansion valve 44, so prevented of the reduction of cooling storage facilities with the low-pressure lateral pressure of refrigerant loop 9.Therefore, prevented the reduction of the COP of the compressor 37 that the reduction because of low-pressure lateral pressure causes.

Like this, if all expansion valves 44,44,51 are full cut-off, when low-pressure lateral pressure LP was reduced to extremely low value, then compressor 37 stopped.Then, if open any one expansion valve 44,44,51, low-pressure lateral pressure rises, and refrigerator controller 32 starting compressors 37 then simultaneously if low-pressure lateral pressure rises to above-mentioned higher limit, then make the operating frequency of compressor 37 rise to high frequency and turn round.

As mentioned above, by being accompanied by of the reduction of cooling storage facilities with the low-pressure lateral pressure LP of refrigerant loop 9, the operating frequency CHz of compressor 37 is reduced, can prevent the reduction of low-pressure lateral pressure LP, but at setting value LPS is a timing, particularly under the light situation of the storehouse of each refrigerating box 3 internal burden, conversion at the operating frequency CHz that carries out compressor 37 continually, when low-pressure lateral pressure LP is on average reduced, owing to produce excessive adjustments (overshoot), so be created under the high state of operating frequency CHz, running stops such problem repeatedly.

Therefore, in the present invention, storehouse temperature (actual temperature in the space that is cooled) TP and design temperature TS that refrigerator controller 32 receives from the above-mentioned refrigerating box 3 of refrigerating box controller 50, the mean value (rolling average of calculating the storehouse temperature TP of each t that fixes time (for example 30 minutes).Be called mean temperature TPA later on).Then, the deviation e (e=TPA-TS) according to this mean temperature TPA and design temperature TS changes above-mentioned setting value LPS.Below, the change control of the setting value LPS of relevant low-pressure lateral pressure LP is described.

The control of this situation is the saturation temperature-deviation e (temperature) that calculates in present setting value LPS, and it is scaled pressure, as setting value LPS (saturation temperature-deviation of the setting value that LPS=is present) after changing.Promptly, be higher than at storehouse temperature TP under the situation of design temperature TS, because deviation e be on the occasion of, so refrigerator controller 32 is to the direction change that reduces setting value LPS, simultaneously, this deviation e is on the occasion of big more, promptly, storehouse temperature TP is higher than design temperature TS, more to the direction change that significantly reduces setting value LPS.On the other hand, be lower than at storehouse temperature TP under the situation of design temperature TS, because deviation e is a negative value, so refrigerator controller 32 is to the direction change that improves setting value LPS, simultaneously, this deviation e negative value is big more, promptly, storehouse temperature TP is lower than design temperature TS, more to the direction change that significantly improves setting value LPS.

Like this, because be the deviation e of the design temperature TS in storehouse temperature (temperature of the reality in the space that is cooled) TP according to refrigerating box 3 and this storehouse, change setting LPS, simultaneously, be higher than at storehouse temperature TP under the situation of design temperature TS, reduce setting value LPS, be lower than at storehouse temperature TP under the situation of design temperature TS, in the direction that improves setting value LPS, change this setting value LPS, so under the high state of storehouse temperature TP, can delay the reduction of the operating frequency CHz (capacity) of compressor 37, keep the cooling capacity of refrigeration with evaporimeter 43.

On the other hand, TP is sufficiently cooled at storehouse temperature, expansion valve 44 reduces valve opening, under the situation that the cooling storage facilities reduces gradually with the low-pressure lateral pressure of refrigerant loop 9, in the stage more early, the operating frequency CHz (capacity) of compressor 37 is reduced, control to the direction of the valve opening expansion that makes expansion valve 44, can promote the rising of low-pressure lateral pressure.In view of the above, can solve the cooling storage facilities and on average reduce this problem, improve the COP of compressor 37, the running efficiency of raising refrigeration system 1 with the low-pressure lateral pressure LP of refrigerant loop 9.In addition, particularly as embodiment, under the situation of using the compressor 37 that carries out operating frequency control by converter, the cycle that this compressor 37 stops fully also is to judge the criterion of change setting LPS.

The change control of the setting value of the low-pressure lateral pressure when (2-2) refrigerating the defrosting of using evaporimeter

Then, refrigerating box controller 50 refrigerates the defrosting with evaporimeter 43 in the regulation moment or stipulated time.This defrosting is that expansion valve 44 is full cut-off, cutting off cold-producing medium inflow refrigeration with under the state of evaporimeter 43, by pressure fan 20, carry out by refrigeration is ventilated with evaporimeter 43, but this refrigeration begins also to be informed to refrigerator controller 32 with the defrosting of evaporimeter 43.Refrigerator controller 32 with in the defrosting of evaporimeter 43, does not carry out the change control to the setting value LPS of above-mentioned low-pressure lateral pressure LP in this refrigeration, but keeps the setting value LPS before the defrosting beginning.

Like this, for example after the process stipulated time, refrigerating box controller 50 finishes the defrosting of refrigeration with evaporimeter 43, open control once more to the valve opening of above-mentioned expansion valve 44, but refrigerator controller 32 returns to the setting value LPS of above-mentioned low-pressure lateral pressure LP the low value of above-mentioned acquiescence after the defrosting end of this refrigeration with evaporimeter 43.

Here, after the defrosting end, the storehouse temperature TP of refrigerating box 3 raises, if expansion valve 44 is open, then for cooling storage facilities refrigerant loop 9, load sharply rises.Therefore, if the setting value LPS before the defrosting beginning is high value, then the operating frequency CHz of compressor 37 reduces in early days, can't chase after from load and rise, but after defrosting finishes, return to the low value of acquiescence by making setting value LPS, the rapid load after just can correspondingly defrosting rises.

, after finishing in aforesaid defrosting, make the setting value LPS of low-pressure lateral pressure LP return to the low value of acquiescence here, in the decline (pull down) after defrosting finishes, compressor 37 is long-time or omnidistance running with high frequency HHz.Therefore, the storehouse temperature TP of refrigerating box 3 can be reduced to above-mentioned lower limit temperature, and in view of the above, expansion valve 44 also cuts out.Therefore, if expansion valve 51 cuts out, then compressor 37 also stops in early days, and in this state, compressor 37 turns round repeatedly continually-stops.

Therefore, in the present invention, the TO duration of runs (beginning to the time that stops) of the compressor 37 after the metering defrosting finishes from running, TO for example is shorter than under 12 minutes the situation in this duration of runs, makes above-mentioned setting value LPS refrigerate the amount that only is equivalent to 2 ℃ of temperature differences with the evaporating temperature rising of the cold-producing medium in the evaporimeter 43.In addition, this duration of runs TO for example more than 12 minutes but do not reach under 15 minutes the situation, make above-mentioned setting value LPS only be equivalent to the amount of 1 ℃ of temperature difference with the evaporating temperature rising of the cold-producing medium in the evaporimeter 43 in refrigeration.That is, the duration of runs, TO was short more, and the ascensional range of setting value LPS is big more.

In view of the above, according to the duration of runs of compressor 37, rise gradually by the setting value LPS that makes low-pressure lateral pressure LP, can simultaneously shorten the required time of decline after defrosting finishes, one side prolongs duration of runs of compressor 37, eliminates frequent running-stop, and seeks to improve running efficiency.

Like this, refrigerator controller 32 is transformed into the change control (2-1) based on the setting value LPS of above-mentioned deviation e under the duration of runs of compressor 37, TO was situation more than 15 minutes.

Be accompanied by of the reduction of aforesaid cooling storage facilities with the low-pressure lateral pressure LP of refrigerant loop 9, reduce by the operating frequency that makes compressor 37, can prevent the reduction of low-pressure lateral pressure LP, but particularly under the light situation of the storehouse of each refrigerating box 3 internal loading, at setting value LPS is a timing, carry out the conversion of the operating frequency CHz of compressor 37 continually, low-pressure lateral pressure LP on average reduces, simultaneously, owing to produce excessive adjustments, run up so produce operating frequency CHz, repeatedly the problem that turns round and stop.

Therefore, in the present invention, refrigerator controller 32 is calculated the mean value LPA of cooling storage facilities with each t that fixes time of the low-pressure lateral pressure LP of refrigerant loop 9, and according to the deviation e of this mean value LPA and above-mentioned setting value LPS, changes above-mentioned setting value LPS.Below, describe with regard to the change control of the setting value LPS of relevant low-pressure lateral pressure LP.

At present, under the situation of above-mentioned setting value LPS＞above-mentioned mean value LPA, refrigerator controller 32 will set value LPS and change to LPS+ (LPS-LPA).That is, make only upward bias e of setting value LPS.Under the situation of setting value LPS＜mean value LPA, refrigerator controller 32 is kept this setting value LPS, does not change.

Like this, at deviation e according to the mean value LPA of the setting value LPS of low-pressure lateral pressure LP and each t that fixes time, change setting LPS, simultaneously, mean value LPA is than under the low situation of setting value LPS, by making the only amount of upward bias e of setting value LPS, the commitment of the process that descends gradually with the low-pressure lateral pressure LP of refrigerant loop 9 at the cooling storage facilities, because the operating frequency CHz (capacity) of compressor 37 is reduced, control to the direction of the valve opening that enlarges expansion valve 44, so can solve the cooling storage facilities with the problem that the low-pressure lateral pressure LP of refrigerant loop 9 on average reduces, improve the COP of compressor 37, the running efficiency of raising refrigeration system 1.In addition, particularly as embodiment, under the situation of using the compressor 37 that carries out operating frequency control by converter, the cycle that this compressor 37 stops fully also is to judge the criterion of change setting LPS.

Here, refrigerator controller 32 receives the information of the state of cooling of the storehouse temperature of relevant each refrigerating box 3... etc. from refrigerating box controller 50, in the refrigerating box 3... of 1-the 6th, existence storehouse temperature TP separately is higher than the setting value TS of this storehouse temperature, under the situation of the cooling deficiency that generation is carried out with evaporimeter 43 by this refrigeration, select generation wherein to cool off most not enough refrigerating box 3, revise the change of the setting value LPS of above-mentioned low-pressure lateral pressure LP.Here, as producing the not enough judgement of cooling is as mentioned above, at storehouse temperature TP (temperature in the space that is cooled) when being higher than design temperature TS, but during when not comprising the running beginning or from hot OFF to hot ON, that is the state of such transition when, not comprising expansion valve 44 from full cut-off to opening.

That is, for example, under the not enough maximum situation of the cooling of the 3rd present refrigerating box 3, refrigerator controller 32 is selected the storehouse temperature TP and the setting value TS of the 3rd refrigerating box 3, makes above-mentioned setting value LPS reduce the saturation pressure strength that is equivalent to TP-TS.

Like this, the state of cooling according to (space is cooled) in the storehouse that is refrigerated the refrigerating box 3 that cools off with evaporimeter 43, producing under the not enough situation of cooling, because refrigerator controller 32 reduces setting value LPS, so can be according to the state of cooling in the storehouse, the operating frequency Hz that change makes compressor 37 is to the control of the direction that reduces, owing to revise to postponing the direction that operating frequency Hz reduces, so can keep the state of cooling in the storehouse of refrigerating box 3 without barrier.

Particularly, because refrigerator controller 32 is selected the most not enough refrigerating box 3 of cooling,, setting value LPS is reduced, so can guarantee the cooling capacity of the refrigerating box that needs most cooling among a plurality of refrigerating box 3.. according to the state of cooling in the storehouse of this refrigerating box 3.In addition, refrigerator controller 32 is when revising the change of above-mentioned setting value LPS, select specific refrigerating box 3 continually (in this case, the 3rd refrigerating box 3), be in this selection under the situation of remarkable state, with relevant the 3rd refrigerating box 3 maybe this refrigeration charge to memory with the record of evaporimeter 43 or expansion valve 44 and preserve.In view of the above, tell the user, for example the 3rd refrigerating box 3 is arranged in the shop position (for example, the position that insolation is strong etc.) of the most difficult cooling, the state of cooling worsens, and can improve.Here, judge the standard that is chosen as significant state of above-mentioned refrigerating box 3, have nothing in common with each other according to the function of refrigeration system 1, ability, method of being used etc., as an example, can consider frequency two times or more the selecteed situation of specific refrigerating box with other, or carry out it when judging, the situation of selected refrigerating box the most repeatedly etc.

Be accompanied by of the reduction of aforesaid cooling storage facilities with the low-pressure lateral pressure LP of refrigerant loop 9, reduce by the operating frequency that makes compressor 37, can prevent the reduction of low-pressure lateral pressure LP, but particularly under the light situation of the storehouse of each refrigerating box 3 internal loading, at setting value LPS is a timing, carry out the conversion of the operating frequency CHz of compressor 37 continually, because low-pressure lateral pressure LP on average reduces, simultaneously, produce excessive adjustments, run up so produce operating frequency CHz, repeatedly the problem that turns round and stop.

Therefore, in the present invention, refrigerator controller 32 is calculated the mean value LPA of cooling storage facilities with each t that fixes time of the low-pressure lateral pressure LP of refrigerant loop 9, and according to the deviation e of this mean value LPA and above-mentioned setting value LPS, changes above-mentioned setting value LPS.Below, describe with regard to the change control of the setting value LPS of relevant low-pressure lateral pressure LP.

Now, each average valve opening of fixing time of the above-mentioned the 1st to the refrigerating box 3... of the mat woven of fine bamboo strips 6 expansion valve 44... is following ratio with respect to the valve opening of regulation.

The valve opening of the expansion valve 44 of the 1st refrigerating box 3 ... ..60%

The valve opening of the expansion valve 44 of the 2nd refrigerating box 3 ... ..40%

The valve opening of the expansion valve 44 of the 3rd refrigerating box 3 ... ..70%

The valve opening of the expansion valve 44 of the 4th refrigerating box 3 ... ..40%

The valve opening of the expansion valve 44 of the 5th refrigerating box 3 ... ..60%

The valve opening of the expansion valve 44 of the 6th refrigerating box 3 ... ..40%

Here, aforementioned proportion is not the ratio with respect to the standard-sized sheet of each expansion valve, but the valve opening that will conform to (with this as the regulation valve opening) with the ability of each refrigerating box 3 (refrigeration with cooler 43) as 100 situation under, expression is stipulated the ratio of valve opening with respect to this.

In above-mentioned example, therefore the valve opening maximum of the expansion valve 44 of the 3rd refrigerating box 3, needs most cooling in the storehouse of the 3rd refrigerating box 3.Under correlation circumstance, refrigerator controller 32 is selected the expansion valve 44 (expansion valve of valve opening maximum) of the 3rd refrigerating box 3.And, setting value LPS is risen.By the rising of this setting value LPS, because the operating frequency CHz of compressor 37 is transformed into low frequency LHz as soon as possible, so as mentioned above, the valve opening of each expansion valve 44... is expanded gradually.

And refrigerator controller 32 is 90% (to be 90% with respect to standard-sized sheet in this case, if make the afore mentioned rules valve opening of the expansion valve 44 of above-mentioned the 3rd refrigerating box 3.Therefore, we can say the ratio 70% with respect to above-mentioned regulation valve opening, is 63% with respect to standard-sized sheet), then make above-mentioned setting value LPS rise to the approaching relevant regulation valve opening (90%) of valve opening of the expansion valve 44 of the 3rd refrigerating box 3 gradually.The change control of this setting value LPS also can be in each regulation sample time, makes it progressively to rise.

Like this, by valve opening according to expansion valve 44, change setting LPS, simultaneously the ratio of the valve opening of the expansion valve 44 of the 3rd refrigerating box 3 less than 90% situation under, setting value LPS is risen, because the commitment of the process that can descend gradually with the low-pressure lateral pressure LP of refrigerant loop 9 at the cooling storage facilities, the operating frequency CHz (capacity) of compressor 37 is reduced, control to direction to the valve opening that enlarges expansion valve 44, so can solve the problem that the cooling storage facilities on average reduces with the low-pressure lateral pressure LP of refrigerant loop 9, improve the COP of compressor 37, improve the running efficiency of refrigeration system 1.

Particularly, because the expansion valve 44 of the 3rd refrigerating box 3 of refrigerator controller 32 selector valve aperture maximums, according to this valve opening change setting LPS, so can guarantee the cooling capacity of a plurality of refrigerations with the refrigerating box that needs most cooling 3 among the evaporimeter 43....

In addition, if the ratio of the valve opening of this expansion valve 44 for example rises to 95%, then refrigerator controller 32 reduces the setting value LPS of compressor 37, until being lower than 90%.In addition, refrigerator controller 32 is when the change control of carrying out above-mentioned setting value LPS, select the ratio (being the 3rd refrigerating box 3 in these cases) of valve opening of the expansion valve 43 of specific refrigerating box 3 continually, be in this selection under the situation of remarkable state, relevant the 3rd refrigerating box 3 maybe should be preserved with the record write memory of evaporimeter 43 or expansion valve 44 in refrigeration.In view of the above, tell the user, for example the 3rd refrigerating box 3 is arranged in the shop position (for example, the position that insolation is strong etc.) of the most difficult cooling, the state of cooling worsens, and can improve.Here, judge the standard that is chosen as significant state of ratio of the valve opening of above-mentioned expansion valve 44, be that the function, ability according to refrigeration system 1, the method that is used etc. have nothing in common with each other, as an example, can consider the ratio of the valve opening of specific expansion valve, with other the selecteed situation of the frequency more than two times, or carry out it when judging, the situation of the expansion valve that the ratio of valve opening is selected at most etc.

Control 1 when (2-3) the cooling storage facilities is with the high loaded process of refrigerant loop

On the other hand, refrigerator controller 32 is because for example storehouse internal loading increase of refrigerating box 3, or the reason of environment temperature rising etc., the cooling storage facilities is a higher load condition with refrigerant loop 9, the high pressure that rises to regulation at its high side pressure HP opens circuit and sets value under the situation of HP1, forces to stop compressor 37 and 54.In view of the above, cool off the protection of storage facilities with refrigerant loop 9.Like this, drop at high side pressure HP under the situation of answer setting value of regulation, allow the running of compressor 37 and 54, but if force the compressor 37 and 54 that stops to be correlated with, then produce the problem that cooling also stops in the storehouse of refrigerating box 3 or household freezer 4.

Therefore, on refrigerator controller 32,, predesignate the protection setting value HP2 of high side pressure HP as the low value of setting value HP1 that opens circuit than above-mentioned high pressure.Like this, be absorbed in higher load condition at the cooling storage facilities with refrigerant loop 9, its high side pressure HP rises under the situation of protection setting value HP2, and its purport is circulated a notice of to refrigerating box controller 50 and household freezer controller 55.If refrigerating box controller 50 and household freezer controller 55 receive the relevant circular from refrigerator controller 32, then reduce the valve opening of expansion valve 44,44 and expansion valve 51 respectively.Valve opening in this case, for example each stipulated time with the regulation step ratio, stage reduces.

Like this, reduce gradually by the valve opening that makes expansion valve 44,44,51, rise with the evaporimeter 43 or the freezing degree of superheat of the cold-producing medium in the evaporimeter 49 of using in refrigeration, because evaporating temperature reduces, so the cooling storage facilities alleviates with the load of refrigerant loop 9, high side pressure HP reduces gradually.Refrigerating box controller 50 and household freezer controller 55 obtain the data of high side pressure HP successively from refrigerator controller 32, as mentioned above, reduce the valve opening of expansion valve 44,44,51 gradually, high side pressure HP with refrigerant loop 9 is reduced to below the specified standard value HP3 until the cooling storage facilities, in the moment that reaches below the standard value HP3, keep the valve opening of this moment.

Then, refrigerating box controller 50 and household freezer controller 55 are reduced to below the standard value HP3 at high side pressure HP, keep the state of valve opening, under the situation that high side pressure HP descends, expand the valve opening of expansion valve 44,44,51 gradually.In this case, also be with the interim expansion of the ratio of regulation step at each official hour.By this expansion, high side pressure HP is rising trend once more, but in the process of the valve opening of expanding this expansion valve 44,44,51 gradually, the rising degree of high side pressure HP is under the situation below the setting dHP of regulation, at this constantly, keep the valve opening of expansion valve 44,44,51.Like this, under this state, under the situation that high side pressure HP descends, after the valve opening of expansion expansion valve 44,44,51, returning to the above-mentioned degree of superheat that makes usually is certain control.

In view of the above, can simultaneously avoid the action of high pressure cut-out function, force to stop the situation of compressor 37,54, one side avoids cooling off the high loaded process of storage facilities with refrigerant loop 9 accurately.In addition, by reducing the valve opening of expansion valve 44,44,51, the cooling capacity of refrigerator is reduced, but because of use evaporimeter 43 or freezing in refrigeration, so can be increased in the cooling capacity in each evaporimeter 43,49 with the evaporating temperature of the cold-producing medium in the evaporimeter 49 with by the increase of the temperature difference of the storehouse temperature of the refrigerating box 3 of its cooling or household freezer 4.Therefore, can make the Min. that is reduced to of actual cooling capacity.Particularly because when high loaded process, the COP of refrigerant loop also reduces, so by the alleviating of load, also can suppress the reduction of running efficiency.

Control 2 when (2-4) the cooling storage facilities is with the high loaded process of refrigerant loop

In addition, also can make the control simplification more of the valve opening of above-mentioned expansion valve 44,44,51.In this case, be absorbed in higher load condition at the cooling storage facilities with refrigerant loop 9, its high side pressure HP rises under the situation of protection setting value HP2, is that its purport is circulated a notice of to refrigerating box controller 50 and household freezer controller 55.Refrigerating box controller 50 and household freezer controller 55 then reduce the valve opening of expansion valve 44,44 and expansion valve 51 respectively as if the relevant circular that receives from refrigerator controller 32.For example the ratio stage with the regulation step reduces valve opening under this situation in each stipulated time.

Refrigerating box controller 50 and household freezer controller 55 obtain the data of high side pressure HP successively from refrigerator controller 32, as mentioned above, reduce the valve opening of expansion valve 44,44,51 gradually, high side pressure HP with refrigerant loop 9 is reduced to below the specified standard value HP3 until the cooling storage facilities, in the moment that reaches below the standard value HP3, controlling it, to return to the above-mentioned common degree of superheat that makes be certain control.According to relevant formation, can be by fairly simple control, one side avoids the pressure of compressor 37 and 54 to stop, and one side avoids cooling off the high loaded process of storage facilities with refrigerant loop 9.

(3) the optimum operation pattern 2: the heating installation running (Fig. 2) of air conditioner

Then, use Fig. 2, just turning round at the heating installation of the air conditioner 6 in winter etc. describes.Master controller 56 operates as under the only situation at the heating installation of judging air conditioner 6, and the data of the most appropriate relevant operation mode 2 are sent to outdoor controller 26, indoor set controller 28, refrigerator controller 32, refrigerating box controller 50 and household freezer controller 55.

According to the data that receive, outdoor controller 26 is changed, and makes a side's of cross valve 14 inlet be communicated to the opposing party's outlet, makes the opposing party's inlet be communicated to a side outlet.In addition, expansion valve 17 is a full cut-off, and expansion valve 18 is a standard-sized sheet.Like this, running compressor 13A, 13B.If compressor 13A, 13B running, then the gaseous refrigerant of the HTHP of discharging from the discharge side of compressor 13A, 13B, enters and utilizes side heat exchanger 27,27 through cross valve 14 from oil eliminator 10.Utilize on the side heat exchanger 27,27 at this, as mentioned above, by pressure fan 15,15, make the air draught in indoor 2 (in the shops), cold-producing medium is heat release here, 2 air in the heating clamber, on the other hand, self condensation liquefaction.In view of the above, carry out the heating installation running in indoor 2 (in the shops).

Come out from utilizing side heat exchanger 27,27 by the cold-producing medium that utilizes 27,27 liquefaction of side heat exchanger, by expansion valve 18, arrive expansion valve 19, there by throttling, become (decompression) after the low pressure, flow among the air-conditioning side path 21A of heat exchanger 21 in parallel, evaporation there, after the heat absorption,, be inhaled into the circulation of the suction side of compressor 13A, 13B repeatedly through accumulator 23.

Outdoor controller 26 is adjusted the valve opening of expansion valve 19 according to the refrigerant temperature of the gateway of heat exchanger 21 in parallel or the temperature of heat exchanger in parallel 21, makes it become the appropriate degree of superheat.In addition, indoor set controller 28 is according to the temperature of utilizing side heat exchanger 27 or be inhaled into the air themperature here, and control is to the pressure fan 15,15 that utilizes side heat exchanger 27,27 to ventilate, and the temperature that makes indoor 2 (in the shops) is a design temperature.In addition, same as described above, by outdoor controller 26, the running of control compressor 13A, 13B.

On the other hand, refrigerator controller 32 is changed, make the cooling storage facilities of cooling device 8 be communicated to the opposing party's outlet with an above-mentioned side's of the cross valve 39 of refrigerant loop 9 inlet, make the opposing party's inlet be communicated to a side outlet, change simultaneously, make an above-mentioned side's of cross valve 41 inlet be communicated to the opposing party's outlet, make the opposing party's inlet be communicated to a side outlet.It is identical when in addition, other magnetic valve etc. is with above-mentioned cold air operation.That is, magnetic valve 46,46,47,52 is opened, running compressor 37 and 54.

In view of the above, the gaseous refrigerant of the HTHP of discharging from compressor 37 successively by cross valve 39,41, at first enters the case side path 21B of heat exchanger 21 in parallel.That is, the gaseous refrigerant of the HTHP of discharging from compressor 37 directly supplied to the case side path 21B of heat exchanger 21 in parallel before removing condenser 38.Use the cold-producing medium of refrigerant loop 9 in heat exchanger 21 heat releases in parallel owing to enter into the cooling storage facilities of this case side path 21B, so the cold-producing medium by the aforesaid idle call refrigerant loop 7 that evaporates in air-conditioning side path 21A is cooled, and accepts heat.In view of the above, the cold-producing medium of idle call refrigerant loop 7 draws the used heat of cooling storage facilities with the cold-producing medium of refrigerant loop 9.

The cold-producing medium of case side path 21B by this parallel connection heat exchanger 21 then through cross valve 39, enters into the entrance side 38A of condenser 38.This condenser 38 also is by pressure fan 35 outer gas to be ventilated, and flow into the cold-producing medium heat release there in the condenser 38, condensation gradually.

The cold-producing medium of entrance side 38A by this condenser 38 arrives outlet side 38B, goes out therefrom.The cold-producing medium that comes out from condenser 38 enters in this fluid reservoir 36 from the entrance side of fluid reservoir 36, there in case store, just carries out gas/liquid and separates.Liquid refrigerant after the separation comes out from the outlet of fluid reservoir 36, and is same as described above by cross valve 41 back branches, towards magnetic valve 46,47,52.

By such running, when the heating installation running of the idle call refrigerant loop 7 of air conditioner 6, by heat exchanger 21 in parallel, reclaim the used heat of cooling storage facilities with the high-pressure side cold-producing medium of refrigerant loop 9, can transport to the side heat exchanger 27,27 that utilizes of idle call refrigerant loop 7.In view of the above, can seek to improve the heating installation ability of air conditioner 6, in a word, can seek to carry out the improvement of the efficient of the refrigeration system 1 of cooling in the storehouse of room conditioning and refrigerating box 3,3, household freezer 4, can also seek energy-conservationization.

Particularly in this case, because the cooling storage facilities passes through condenser 38 with the on high-tension side cold-producing medium of refrigerant loop 9, at first flow to heat exchanger 21 in parallel, so can carry out effectively from of the recovery of cooling storage facilities, can further improve the heating installation ability in the side heat exchanger 27,27 utilized at idle call refrigerant loop 7 with the used heat of the high-pressure side cold-producing medium of refrigerant loop 9.

Here, because if indoor 2 (in the shops) are warmer etc., make air conditioner 6 be light load, then outdoor controller 26 reduces the valve opening of expansion valve 19, refrigerant flow is lowered gradually, so the cooling storage facilities in heat exchanger 21 in parallel is superfluous gradually with the thermal discharge of the cold-producing medium of refrigerant loop 9, but in the present invention, because after the cooling storage facilities flows to heat exchanger 21 in parallel with the on high-tension side cold-producing medium of refrigerant loop 9, flow to condenser 38, so when the heating installation running of idle call refrigerant loop 7, cooling off the thermal discharge of storage facilities with the cold-producing medium in the heat exchanger in parallel 21 of refrigerant loop 9 is under the situation of surplus, by condenser 38, emit this superfluous heat.In view of the above, can realize stable Waste Heat Recovery running.

In addition, as mentioned above, use cross valve 39 and 41, the conversion stream, when the cold air operation of idle call refrigerant loop 7 and heating installation when running, make the circulating direction of the cold-producing medium that flows with the condenser 38 of refrigerant loop 9 and with fluid reservoir 36 that its outlet connects to the cooling storage facilities identical.In view of the above, with when the cold air operation and during the heating installation running, the opposite situation of the flow direction of the cold-producing medium in condenser 38 or the fluid reservoir 36 is compared, and can prevent or be suppressed at the generation of cooling storage facilities with the pressure loss of the cold-producing medium that flows in the refrigerant loop 9, makes effective running become possibility.Particularly because with 2 cross valves, 39,41 conversion streams, so the cooling storage facilities is oversimplified with the formation of refrigerant loop 9.

(4) the most appropriate operation mode 3: almost when not required control (Fig. 3) of the heat release in the heat exchangers in series of the cooling device when the running of the heating installation of air conditioner

Here, as mentioned above, when the heating installation running of air conditioner 6, if the load of indoor (in the shop) air is littler, the heating installation ability is excessive, and then outdoor controller 26 is according to the information of indoor temperature, the operating frequency of compressor 13B is reduced, the heating installation ability is reduced.On the other hand, even if carry out such control, and, resemble emit superfluous heat by condenser 38 above-mentioned after, under the also almost unwanted situation of heat release in the cooling storage facilities usefulness heat exchanger in parallel 21 of refrigerant loop 9 of cooling device 8, then do not change the loop of Fig. 2, the heating installation ability of air conditioner 6 is superfluous.

Under relevant situation, refrigerator controller 32 is transformed into each cross valve 39,41 state of Fig. 3 from Fig. 2.That is, in this case, refrigerator controller 32 is changed, and makes an above-mentioned side's of cross valve 39 inlet be communicated to a side outlet, makes the opposing party's inlet be communicated to the opposing party's outlet.In addition, change, make an above-mentioned side's of cross valve 41 inlet be communicated to a side outlet, make the opposing party's inlet be communicated to the opposing party's outlet.

In view of the above, the cold-producing medium of the HTHP of discharging from compressor 37 is because identical with the situation of Fig. 1, by condenser 38, after heat release, flow in the heat exchanger 21 in parallel, so can avoid the cold-producing medium of idle call refrigerant loop 7 to pass through heat exchanger 21 in parallel, the problem that is heated superfluously.

In addition, in an embodiment, be by the refrigeration system of the cooling of in convenience store, carrying out indoor air-conditioning and cooling storage facilities, describe the present invention, but be not limited in this, only cool off the cooling of storage facilities, the present invention also is effective.Having, in an embodiment, is the control of the operating frequency that undertaken by converter again, realizes the volume controlled to compressor, but be not limited in this that various volume controlled can be used.Have, the change control of above-mentioned setting value LPS can not undertaken by storehouse temperature TP and design temperature TS again, under can being determined at the situation of refrigeration with the evaporating temperature of the cold-producing medium in the evaporimeter 43, can carry out according to this evaporating temperature and its design temperature yet.In addition, in the above-described embodiments, be the control of the operating frequency that undertaken by converter, compressor 37 and 13A carried out volume controlled, but be not limited in this as the meaning of volume controlled, comprise that also many (for example connect compressor side by side, the connection arranged side by side of many constant speed compressors, a constant speed compressor and a converter control compressor arranged side by side are connected etc.), the situation of the platform number of conversion running, or on this basis, the situation of control operating frequency.For example, also can many connect the compressors of quota operating types side by side, by the ON/OFF control capacity (platform numerical control system) of running.In this case, though can not carry out fine-drawn volume controlled, construction system at an easy rate.In addition, in an embodiment, expansion valve is an electric expansion valve, but is not limited in this, so long as can adjust the expansion valve of valve opening by controller, air pressure or hydraulic pressure etc. can use.

Claims (15)

1. a refrigeration system has compressor, condenser, expansion valve and the evaporimeter that can carry out volume controlled, constitutes refrigerant loop, it is characterized in that,

Control device with control above-mentioned compressor,

Value of capping up and down and lower limit in the setting value of stipulating, this control device is according to the low-pressure lateral pressure of above-mentioned refrigerant loop, drop under the situation of the lower limit in above-mentioned higher limit and the lower limit at above-mentioned low-pressure lateral pressure, the capacity of above-mentioned compressor is descended, rising under the situation of above-mentioned higher limit, the capacity of above-mentioned compressor is risen, simultaneously, deviation according to the design temperature in the actual temperature in the space that is cooled by above-mentioned evaporator cools and this space that is cooled changes above-mentioned setting value.

2. refrigeration system as claimed in claim 1, it is characterized in that, above-mentioned control device is higher than under the situation of above-mentioned design temperature with the actual temperature in the above-mentioned space that is cooled, reduce above-mentioned setting value, and the direction that be lower than under the situation of above-mentioned design temperature in the actual temperature in the above-mentioned space that is cooled, improves above-mentioned setting value changes this setting value.

3. refrigeration system as claimed in claim 1 or 2 is characterized in that, above-mentioned control device makes above-mentioned setting value turn back to the low value of predesignating after the defrosting of above-mentioned evaporimeter finishes.

4. refrigeration system as claimed in claim 3 is characterized in that, the duration of runs of the above-mentioned compressor after above-mentioned control device finishes according to above-mentioned defrosting, above-mentioned setting value is risen.

5. refrigeration system as claimed in claim 4, it is characterized in that, above-mentioned control device is that the duration of runs of above-mentioned compressor is short more, the ascensional range of above-mentioned setting value is increased, reach in the duration of runs of above-mentioned compressor under the situation of stipulated time, be transformed into change control above-mentioned setting value based on above-mentioned deviation.

6. refrigeration system has a plurality of compressors, condenser, expansion valve and the evaporimeter of connection arranged side by side, constitutes refrigerant loop, it is characterized in that,

Control device with control above-mentioned compressor,

Value of capping up and down and lower limit in the setting value of stipulating, this control device is according to the low-pressure lateral pressure of above-mentioned refrigerant loop, drop under the situation of the lower limit in above-mentioned higher limit and the lower limit at above-mentioned low-pressure lateral pressure, the capacity of above-mentioned compressor is descended, rising under the situation of above-mentioned higher limit, the capacity of above-mentioned compressor is being risen, simultaneously, according to the mean value of each above-mentioned low-pressure lateral pressure of fixing time and the deviation of above-mentioned setting value, change above-mentioned setting value.

7. refrigeration system as claimed in claim 6 is characterized in that above-mentioned control device is lower than under the situation of above-mentioned setting value at above-mentioned mean value, and above-mentioned setting value is risen.

8. refrigeration system as claimed in claim 7 is characterized in that, according to the state of cooling by the space that is cooled of above-mentioned evaporator cools, is taking place under the not enough situation of cooling above-mentioned setting value to be reduced.

9. refrigeration system as claimed in claim 8, it is characterized in that, have a plurality of above-mentioned evaporimeters and by the situation in the above-mentioned space that is cooled of its cooling under, above-mentioned control device is selected the most not enough above-mentioned space that is cooled of cooling, according to the state of cooling in this space that is cooled, above-mentioned setting value is reduced, simultaneously, selection in the specific space that is cooled is under the situation of remarkable state, retains the record of relevant this be cooled space and/or its corresponding evaporimeter.

10. as each the described refrigeration system in the claim 6 to 9, it is characterized in that, with above-mentioned evaporimeter as refrigeration and/or freezingly use with evaporimeter, and, constitute the idle call refrigerant loop by compressor, utilize the side heat exchanger, expansion valve, outdoor heat converter that use as idle call, simultaneously, this idle call refrigerant loop and above-mentioned refrigerant loop are connected in series, constitute the heat extraction that makes this refrigerant loop and in above-mentioned idle call refrigerant loop, can utilize.

11. a refrigeration system has a plurality of compressors, condenser, the expansion valve that can adjust valve opening and the evaporimeter of connection arranged side by side, constitutes refrigerant loop, it is characterized in that,

Control device with control above-mentioned compressor and expansion valve,

This control device is adjusted the valve opening of above-mentioned expansion valve, the degree of superheat that makes the cold-producing medium in above-mentioned evaporimeter is for certain, simultaneously, low-pressure lateral pressure according to above-mentioned refrigerant loop, setting value by regulation, the capacity of above-mentioned compressor is reduced, and, change above-mentioned setting value according to the valve opening of above-mentioned expansion valve.

12. refrigeration system as claimed in claim 11 is characterized in that, above-mentioned control device rises above-mentioned setting value, thereby the valve opening that makes above-mentioned expansion valve is near standard-sized sheet.

13. as claim 11 or 12 described refrigeration systems, it is characterized in that, under the situation that has a plurality of above-mentioned evaporimeters and its corresponding above-mentioned expansion valve, the above-mentioned expansion valve of above-mentioned control device selector valve aperture maximum, change above-mentioned setting value according to this valve opening, simultaneously, the selection at specific expansion valve is under the situation of remarkable state the record of relevant this expansion valve of retention and/or its corresponding evaporimeter.

14. each the described refrigeration system as in the claim 6 to 9,11 to 13 is characterized in that, at least 1 in above-mentioned a plurality of compressors is the compressor of volume-variable formula.

15. as each the described refrigeration system in the claim 11 to 14, it is characterized in that, with above-mentioned evaporimeter as refrigeration and/or freezingly use with evaporimeter, and, constitute the idle call refrigerant loop by compressor, utilize the side heat exchanger, expansion valve, outdoor heat converter that use as idle call, simultaneously, this idle call refrigerant loop and above-mentioned refrigerant loop are connected in series, and constitute the heat extraction that makes this refrigerant loop and can utilize in above-mentioned idle call refrigerant loop.

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