CN104068688A - Open-type display cabinet and refrigeration device thereof - Google Patents
Open-type display cabinet and refrigeration device thereof Download PDFInfo
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- CN104068688A CN104068688A CN201410115311.2A CN201410115311A CN104068688A CN 104068688 A CN104068688 A CN 104068688A CN 201410115311 A CN201410115311 A CN 201410115311A CN 104068688 A CN104068688 A CN 104068688A
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- cooling
- open showcase
- showroom
- control device
- evaporimeter
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Abstract
The invention discloses an open-type display cabinet and a refrigeration device thereof, which can be used to control the opening degree of the expansion valve to stabilize the temperature of the blown cool wind. The refrigeration device (R) is constituted by a plurality of open-type display cabinets (1) and a refrigerators (2). A main control device (12) and a terminal side control device (13) of each of the open-type display cabinet (1) can be used to control the opening degree of the expansion valve (11) by changing the superheat degree of an evaporator (9) to the target superheat degree. By setting the blown the cool wind at the predetermined temperature to the display cabinets as the reference, a plurality of control zones can be arranged, and the target superheat degree of the various control zones can be changed.
Description
Technical field
The open Showcase displaying when the present invention relates to a kind of cooling commodity and the refrigerating plant being formed by it.
Background technology
All the time, in the shop such as supermarket and convenience store, be provided with many open Showcases.And, by the cold air that has carried out heat exchange with the evaporimeter of each open Showcase is blown out to showroom, thereby in cooling commodity, display in this showroom.In addition, although distribute the supply system cryogen from the compressor of refrigerator of the refrigerant loop that forms refrigerating plant together with evaporimeter to the evaporimeter of each open Showcase, but the cold-producing medium of evaporimeter is supplied with and controlled (for example,, with reference to patent documentation 1) by the expansion valve being connected with entrance side.
In addition, in recent years, adopt the so-called electric expansion valve (also claiming electric expansion valve) by drivings such as stepper motors always.In the situation that controlling above-mentioned expansion valve, set the target degree of superheat of the regulation of evaporimeter, become this valve opening of mode control of this target degree of superheat with the refrigerant superheat degree (exporting the poor of refrigerant temperature and entrance refrigerant temperature) of evaporimeter.And the cold air temperature that blows out blowing out to showroom becomes after design temperature, the valve opening full cut-off of expansion valve, stops supplying with to the cold-producing medium of evaporimeter.In addition, the low pressure of the compressor of refrigerator based on refrigerant loop, controls in the mode of the low pressure setting value that becomes regulation.
Patent documentation 1: TOHKEMY 2007-255845 communique
But, conventionally, the target degree of superheat of evaporimeter is fixed on certain value (such as 5deg etc.), therefore, exist because the load in showroom (input amount of commodity and extraneous gas temperature) makes to blow out undue decline of cold air temperature and become full-shut position, and be absorbed in the problem of at once open state.So, consider in the stage that blows out cold air temperature and approach design temperature, at it after, every certain hour makes the target degree of superheat become large, but does not eliminate expansion valve and repeat the problem of switching, thus, blows out cold air temperature and also becomes unstable.
Summary of the invention
The present invention sets up in order to solve above-mentioned existing technical task just, and its object is, a kind of open Showcase is provided and possesses its refrigerating plant, can make to blow out cold air temperature stabilisation by the valve opening of suitable control expansion valve.
In order to solve above-mentioned problem, to have carried out the cold air of heat exchange cooling to carry out with evaporimeter to blowing out in the showroom of display goods for open Showcase of the present invention, it is characterized in that possessing: expansion valve, and it is connected with the entrance side of evaporimeter; Blow out cold air temperature checkout gear, it is for detection of the cold air temperature that blows out to showroom; Evaporator superheat checkout gear, it is for detection of the refrigerant superheat degree of evaporimeter; Control device, the valve opening of its output control expansion valve based on each checkout gear, this control device becomes the valve opening of the mode control expansion valve of the target degree of superheat of regulation with the refrigerant superheat degree of evaporimeter, and, set multiple control zones taking the design temperature that blows out cold air temperature to showroom as benchmark, in each control zone, change the target degree of superheat.
The open Showcase of second aspect present invention, in foregoing invention, is characterized in that, in the control zone that more approaches design temperature, control device more increases the target degree of superheat.
The open Showcase of third aspect present invention, in foregoing invention, is characterized in that, in the situation that blowing out cold air temperature and becoming below design temperature, control device makes expansion valve full cut-off.
The refrigerating plant of fourth aspect present invention, possesses the open Showcase of many above-mentioned each inventions, from thering is the refrigerator of compressor that forms the refrigerant loop of regulation with the evaporimeter of each open Showcase to the evaporimeter the supply system cryogen of each open Showcase, it is characterized in that, the low pressure of control device based on refrigerant loop is to become the operation of mode control compressor of low pressure setting value of regulation, and, set the cooling level value of regulation in each control zone, judge the state of cooling of the showroom of open Showcase based on this cooling level value, adjust low pressure setting value based on this result of determination.
The refrigerating plant of fifth aspect present invention, in foregoing invention, is characterized in that, control device as cooling deficiency, declines low pressure setting value in the state of cooling of showroom of judging open Showcase according to cooling level value.
The refrigerating plant of sixth aspect present invention, in the present invention the 4th or fifth aspect present invention, it is characterized in that, control device the state of cooling of showroom of judging open Showcase according to cooling level value as overcooled situation under, make low pressure setting value increase.
The refrigerating plant of seventh aspect present invention, in aspect the present invention the four～six, it is characterized in that, control device in the state of cooling of showroom of judging open Showcase according to cooling level value neither cooling deficiency nor be in overcooled situation maintains low pressure setting value.
The refrigerating plant of eighth aspect present invention, aspect the present invention the four～seven in, it is characterized in that, control device is repeatedly collected cooling level value, the mean value of the each cooling level value based on collecting is judged the state of cooling of showroom of open Showcase.
According to the present invention, in the showroom to display goods, blow out the cold air that carried out heat exchange with evaporimeter and in cooling open Showcase, possess carrying out: expansion valve, it is connected with the entrance side of evaporimeter; Blow out cold air temperature checkout gear, it is for detection of the cold air temperature that blows out to showroom; Evaporator superheat checkout gear, it is for detection of the refrigerant superheat degree of evaporimeter; Control device, the valve opening of its output control expansion valve based on each checkout gear, this control device becomes the valve opening of the mode control expansion valve of the target degree of superheat of regulation with the refrigerant superheat degree of evaporimeter, and, set multiple control zones taking the design temperature that blows out cold air temperature to showroom as benchmark, in each control zone, change the target degree of superheat, therefore, can adjust the refrigerant superheat degree of evaporimeter by expansion valve by the cold air temperature that blows out based on to showroom, the effective area of evaporimeter is changed.
Thus, for example, described in second aspect present invention, pass through control device, in the control zone that more approaches design temperature, the target degree of superheat is more increased, thus, can approach design temperature the effective area of evaporimeter is diminished along with blowing out cold air temperature, and make to blow out cold air temperature and stably approach design temperature.Therefore, the valve opening control of expansion valve and highly stable to the both sides that blow out cold air temperature of showroom.
In addition, as described in third aspect present invention, if be below design temperature in the situation that by control device blowing out cold air temperature, make expansion valve full cut-off, there is the effect of also supercooling in showroom being eliminated reliably.
In addition, according to fourth aspect present invention, possessing the open Showcase of many above-mentioned each inventions, from thering is the refrigerator of compressor that forms the refrigerant loop of regulation with the evaporimeter of each open Showcase to the refrigerating plant of the evaporimeter the supply system cryogen of each open Showcase, the low pressure of control device based on refrigerant loop is to become the operation of mode control compressor of low pressure setting value of regulation, and, set the cooling level value of regulation in each control zone, judge the state of cooling of the showroom of open Showcase based on this cooling level value, adjust low pressure setting value based on this result of determination, therefore, for example, described in the present invention the five～seven aspect, pass through control device, in the state of cooling of showroom of judging open Showcase according to cooling level value as cooling deficiency, low pressure setting value is declined, the state of cooling of judging showroom as overcooled situation under, make low pressure setting value increase, in the state of cooling of judging showroom neither cooling deficiency nor be in overcooled situation, maintain low pressure setting value, therefore, can suitably control according to the state of cooling of the showroom of each open Showcase the operation of compressor, eliminate the cooling deficiency of showroom, and, also contribute to energy-conservation.
In this case, as described in eighth aspect present invention, as long as control device is repeatedly collected cooling level value, and the mean value of each cooling level value based on collecting is judged the state of cooling of showroom of open Showcase,, except the impact being brought by the temporary transient variation that blows out cold air temperature, can make according to the operation control stabilisation of the compressor of low pressure setting value.
Brief description of the drawings
Fig. 1 is the refrigerant loop of refrigerating plant and the pie graph of control that possesses the open Showcase of many application one embodiment of the invention;
Fig. 2 is the vertical profile side view of the open Showcase of Fig. 1;
Fig. 3 is the figure of the valve opening control of the expansion valve of the open Showcase of key diagram 1;
Fig. 4 is the flow chart of the low pressure control of the refrigerating plant of Fig. 1;
Fig. 5 is the figure of the low pressure control of key diagram 4.
Symbol description
R refrigerating plant
1 open Showcase
2 refrigerators
3 compressors
4 radiators
7,8 refrigerant pipings
9 evaporimeters
11 expansion valves
12 main control units (control device)
13 end side control device (control device)
14 low-pressure sensors
23 showrooms
36 blow out temperature sensor (blowing out cold air temperature checkout gear)
41 inlet temperature sensors (evaporator superheat checkout gear)
42 outlet temperature sensors (evaporator superheat checkout gear)
Detailed description of the invention
Below, with reference to the accompanying drawings embodiments of the present invention are elaborated.The refrigerating plant R cooling settings of application one embodiment of the invention is in many open Showcases 1 in the shops such as supermarket, by being arranged at the each open Showcase 1 in shop and distributing the refrigerator 2 of the supply system cryogen to form to them.The refrigerator 2 of embodiment possesses can control the compressor 3 of running frequency, be connected with the discharge side of this compressor 3 and make HTHP gas refrigerant heat radiation radiator 4 and make the outdoor draft fan 6 of these radiator 4 air coolings.
In addition, the cold-producing medium using in refrigerating plant R is known cold-producing medium, do not carry out specific at this, but in radiator 4, carry out the cold-producing medium of condensation, radiator 4 becomes condenser, in the situation that as carbon dioxide, high-pressure side becomes supercriticality, cold-producing medium does not carry out condensation at radiator 4, only heat radiation.
This refrigerator 2 is arranged at outside shop, and the refrigerant piping 7 being connected with the outlet side of radiator 4 and the refrigerant piping 8 that is connected with the suction side of compressor 3, in shop, become the form that is parallel with each open Showcase 1 at them.; as described in detail below; each open Showcase 1 possesses evaporimeter 9 and the expansion valve 11 being connected with the refrigerant inlet side of this evaporimeter 9; the refrigerant inlet of expansion valve 11 is connected with refrigerant piping 7, and the refrigerant outlet of evaporimeter 9 and refrigerant piping 8 connect and compose the known refrigerant loop of refrigerating plant R.In addition, the expansion valve 11 of embodiment is electric expansion valve driven by stepper motors, valve opening can be controlled to the value of the regulation that comprises full cut-off.
In Fig. 1,12 is main control unit.This main control unit 12, for to be arranged at each open Showcase 1 in shop and the master controller of refrigerator 2 for centralized Control, forms in the mode that can set the service conditions such as the design temperature of each open Showcase 1 in this main control unit 12.In each open Showcase 1 and refrigerator 2, be provided with end side control device 13, be connected with main control unit 12 by order wire respectively, and form (in Fig. 1, only representing leftmost open Showcase 1) can carry out the mode of the sending and receiving of data.
These main control units 12 and each end side control device 13 form by microcomputer, construct control device of the present invention by these.Send ID that the end side control device 13 of each open Showcase 1 and refrigerator 2 is given and the relevant data of aforesaid service condition etc. from main control unit 12, send the ID of self and the data relevant to the running status such as temperature and pressure of each portion of each open Showcase 1 and refrigerator 2 from each end side control device 13 to main control unit 12, and be collected.In main control unit 12, be configured to and can the data of these collections confirmed/be analyzed etc., thus, main control unit 12 can the each open Showcase 1 of centralized Control and refrigerator 2.
In refrigerator 2, be provided with the low-pressure sensor 14 as low pressure checkout gear of the low pressure that checks refrigerant loop etc., be connected with the end side control device 13 of refrigerator 2.And, the low pressure of refrigerant loop that the end side control device 13 of refrigerator 2 detects based on this low-pressure sensor 14 and the low pressure of regulation setting value, become the running frequency of compressor 3 and the operation of outdoor draft fan 6 of the mode control refrigerator 2 of low pressure setting value with low pressure.
Below, open Showcase 1 and the end side control device 13 of being located at it are described.By cross section, roughly the thermal wall 16 of コ word shape and the not shown side plate in both sides that is installed on this thermal wall 16 form the open Showcase 1 of embodiment.There is interval respectively and dividing plate 17,18 is installed in the inner side of thermal wall 16, between these dividing plates 17 and 18, be made as internal layer passage 19, between the dividing plate 18 in outside and thermal wall 16, be made as outer layer channel 21.
Front, bottom at the dividing plate 17 of inner side is provided with base plate 22, using the inner side of these dividing plates 17 and base plate 22 as showroom 23.In the thermal wall 16 of the upper limb of the front openings 24 of showroom 23 and be provided with internal layer blow-off outlet 26 and outer blow-off outlet 27 that cellular material is installed, these internal layer blow-off outlets 26 and outer blow-off outlet 27 are communicated with internal layer passage 19 and outer layer channel 21 respectively.In the thermal wall 16 of the lower edge of opening 24 and be provided with internal layer suction inlet 28 and outer suction inlet 29, two suction 28,29 is communicated with internal layer passage 19 and outer layer channel 21 respectively.
On the other hand, in internal layer passage 19 and outer layer channel 21 below base plate 22, be separately installed with internal layer pressure fan 31 and outer pressure fan 32.In addition, in internal layer passage 19 overleaf, be longitudinally set with the aforesaid evaporimeter 9 of the refrigerant loop that forms refrigerating plant R, and, be provided with at showroom 23 internal frames the shelf 33 that multilayer commodity display is used.In addition, 34 for being installed on the temperature indicator above of thermal wall 16 of upside of opening 24.
Then, 36 blow out the temperature sensor that blows out of cold air temperature checkout gear for being located at conduct in the internal layer passage 19 of internal layer blow-off outlet 26 fronts, the temperature (blowing out cold air temperature) of having carried out the cold air blowing out from internal layer blow-off outlet 26 after heat exchange with evaporimeter 9 is detected.37 for being located at the showroom temperature sensor as temperature-detecting device in showroom on 23Nei top, showroom, and the temperature (display indoor temperature) to the cold air in showroom 23 detects.In addition, 38 suck the inlet temperature sensor of cold air temperature checkout gear for being located at conduct in the internal layer passage 19 of internal layer pressure fan 31 fronts, and the temperature (suction cold air temperature) to the cold air sucking from internal layer suction inlet 28 detects.In addition, 41 and 42 is the refrigerant temperature of the refrigerant inlet side to evaporimeter 9 and refrigerant outlet side detects respectively inlet temperature sensor and outlet temperature sensor, and they form evaporator superheat checkout gear.
And these blow out the output of temperature sensor 36, showroom temperature sensor 37, inlet temperature sensor 38, inlet temperature sensor 41 and outlet temperature sensor 42 and the end side control device 13 of this open Showcase 1 is connected.And end side control device 13 is according to the operation of the valve opening of the output control expansion valve 11 of these temperature sensors and each pressure fan 31,32, and, show by temperature indicator 34 temperature that showroom temperature sensor 37 detects.Especially, the refrigerant inlet temperature of the evaporimeter 9 that the refrigerant outlet temperature of the evaporimeter 9 that end side control device 13 detects according to outlet temperature sensor 42 and inlet temperature sensor 41 detect poor, detect the refrigerant superheat degree of evaporimeter 9, and valve opening based on this refrigerant superheat degree control expansion valve 11.
The action of refrigerating plant R by above formation to embodiment describes.In the time that compressor 3 moves, the gas refrigerant inflow radiator 4 of the HTHP being compressed by this compressor 3 dispel the heat (so, carry out condensation in the case of using the cold-producing medium of condensation).Enter in shop through refrigerant piping 7 from radiator 4 cold-producing medium out, and distribute to each open Showcase 1.The cold-producing medium of the expansion valve 11 of arrival open Showcase 1, after this decompression, flows into evaporimeter 9 and evaporates.At this moment, under heat-absorbing action, evaporimeter 9 is brought into play cooling capacity.
The cold air having carried out in the internal layer passage 19 of heat exchange with evaporimeter 9 blows out to the opening 24 of showroom 23 from the internal layer blow-off outlet 26 of opening 24 upper limbs by internal layer pressure fan 31, suck from the internal layer suction inlet 28 of opening 24 lower edges, thus, form cold air gas curtain at opening 24.In addition, the air gas curtain that is blown out, sucks from outer suction inlet 29 from outer blow-off outlet 27 through outer layer channel 21 by outer pressure fan 32 plays the effect of the cold air gas curtain of protection inner side.
A part for this cold air gas curtain in the interior circulation in showroom 23 with the commodity on cooling each shelf 33.Refrigerant piping 8 and the cold-producing medium interflow from other open Showcase 1, repeat again to suck the circulation of compressor 3 from evaporimeter 9 cold-producing medium out.
(1) control of expansion valve
Below, the valve opening control of the expansion valve 11 to each open Showcase 1 describes.First, the refrigerant superheat degree of the evaporimeter 9 of the end side control device 13 of each open Showcase 1 based on being sent to the target degree of superheat of this end side control device 13 by main control unit 12 and obtain from outlet temperature sensor 42 and inlet temperature sensor 41, becomes the valve opening of the mode control expansion valve (electric expansion valve) 11 of the target degree of superheat with this refrigerant superheat degree.In this case, end side control device 13 by practical, do not interfere PID to control expansion valve 11.
That is, in an embodiment, by deviation e, the Proportional coefficient K of the refrigerant superheat degree by current and the target degree of superheat
p, differential coefficient K
d, the time of integration T
i, derivative time T
dexpress general practicality, do not interfere PID arithmetic expression to calculate operational ton (valve opening variable quantity) the △ MVn of expansion valve 11.The end side control device 13 of open Showcase 1, by the valve opening of the above-mentioned PID s operation control expansion valve 11 of the deviation e of the current refrigerant superheat degree based on evaporimeter 9 and the target degree of superheat, is controlled at the target degree of superheat by the refrigerant superheat degree of evaporimeter 9.
Below, with reference to Fig. 3, the valve opening control of actual expansion valve 11 is described.Also can be the end side control device 13 of each open Showcase 1 at main control unit 12() be set with the design temperature that blows out cold air temperature of each open Showcase 1.And main control unit 12 is set multiple control zones (adding up to four as 1～control zone, control zone 4 in an embodiment) (Fig. 3) taking the design temperature that sets (temperature regulates and sets) as benchmark.
In this case, the main control unit 12 of embodiment is set than the switching temperature 2 blowing out between switching temperature 1 and this switching temperature 1 and the design temperature of the high setting of design temperature of cold air temperature, region by switching temperature more than 1 is made as control zone 1, lower and more than 2 regions is made as control zone 2 in switching temperature than switching temperature 1, the region lower and higher than design temperature than switching temperature 2 is made as control zone 3, and the region below design temperature is made as control zone 4.
And, send at the end side control device 13 by open Showcase 1 blow out cold air temperature (blowing out the temperature that temperature sensor 36 detects) and be positioned at above design temperature control zone 1 farthest time, the target degree of superheat is made as to for example 5deg left and right of target degree of superheat 1(), be positioned at while more approaching the control zone 2 of design temperature than control zone 1, the target degree of superheat is made as to the target degree of superheat 2(for example 8deg left and right larger than the target degree of superheat 1), being positioned at while more approaching the control zone 3 of design temperature than control zone 2, the target degree of superheat is made as to the target degree of superheat 3(for example 15deg left and right larger than the target degree of superheat 2).That is, approach the control zone of design temperature, the target degree of superheat is larger.Thus, approach its design temperature along with blowing out cold air temperature, it is large that the target degree of superheat becomes.And main control unit 12 sends the data (data relevant to service condition) of the target degree of superheat after determining to the end side control device 13 of this open Showcase 1.In addition, in the time blowing out cold air temperature and be positioned at control zone 4, main control unit 12 is by so that the data (data relevant to service condition) that expansion valve 11 full cut-offs (valve opening is zero) are purport send to the end side control device 13 of this open Showcase.
Receive mode that the end side control device 13 of the open Showcase 1 of the above-mentioned data relevant to the control of expansion valve 11 becomes each target degree of superheat with the refrigerant superheat degree of the evaporimeter 9 that obtains from outlet temperature sensor 42 and inlet temperature sensor 41 from main control unit 12 by the valve opening of aforesaid PID s operation control expansion valve 11, and, in the case of sending the instruction of full cut-off, make expansion valve 11 full cut-offs (valve opening is zero).
The passing that blows out temperature of the open Showcase 1 that the valve opening control by above-mentioned expansion valve 11 is produced represents in the lump in Fig. 3.If the what is called after supposition is provided with open Showcase 1 and after the defrosting of evaporimeter 9 declines (pull down), be increased to switching temperature more than 1 and be positioned at control zone 1 at the current cold air temperature that blows out that blows out that temperature sensor 36 detects, the target degree of superheat is made as target degree of superheat 1(5deg left and right), therefore, the effective area of evaporimeter 9 large (cold-producing medium of the amount existing near liquid refrigerant outlet from refrigerant inlet is supplied with by expansion valve 11).Thus, circulate by internal layer pressure fan 31, carry out after heat exchange with evaporimeter 9, the temperature of the cold air blowing out from internal layer blow-off outlet 26 (blowing out cold air temperature) declines rapidly.
Then, become lower than switching temperature 1, and enter control zone 2 if blow out cold air temperature, the target degree of superheat is extended to target degree of superheat 2(8deg left and right).Thus, the effective area of evaporimeter 9 dwindles, and therefore, the decline degree that blows out cold air temperature becomes slow.And, become lower than switching temperature 2 if blow out cold air temperature, and enter control zone 3, the target degree of superheat is further extended to target degree of superheat 3(15deg left and right).Thus, the effective area of evaporimeter 9 further dwindles, and therefore, the decline degree that blows out cold air temperature further slows down, and moves closer to design temperature, more or less fluctuates while tends towards stability (Fig. 3).
In addition, blowing out that cold air temperature becomes below design temperature, enter control zone 4 in the situation that, as described above, expansion valve 11 full cut-offs, therefore, supply with to the cold-producing medium of evaporimeter 9 and stop, cooling the stopping (disconnected heat) of showroom 3.Then, enter control zone 3 in the case of blowing out the temperature rise that temperature sensor 36 detects, expansion valve 11 is again open, returns to the state of being controlled by the target degree of superheat 3.
(2) control of low pressure
Below, with reference to Fig. 4 and Fig. 5, the control of the low pressure to refrigerating plant R describes.Fig. 4 represents the control flow of main control unit 12.First, main control unit 12 is set cooling level value in each control zone 1～4 of aforesaid Fig. 3.In this case, the cooling level value of the control zone 1 of embodiment is made as " 1 ", and the cooling level value of control zone 2 is made as " 2 ", and the cooling level value of control zone 3 is made as " 3 ", and the cooling level value of control zone 4 is made as " 4 or 5 ".That is, blow out cold air temperature and more approach design temperature, cooling level value more becomes large (adding adaptability in tactics weight).
And main control unit 12 current blows out the data which control zone cold air temperature is positioned at and collects the cooling level value that is set in this control zone according to what sent by the end side control device 13 of each open Showcase 1.In embodiment, the data that main control unit 12 (each minute) per minute in the step S1 of Fig. 4 is collected cooling level value, and it is repeated to 10 minutes in an embodiment (10 times).Then, in step S2, judge whether the data of all cooling level values of collecting are " 4 ", for the open Showcase 1 that is " 4 ", enter step S14 and judge that this open Showcase 1 is non-cold, from judge object, remove.
For being no open Showcase 1 in step S2, entering the mean value that step S3 judges the cooling level value of each open Showcase 1 and whether judge that than the state of cooling upper limit is large.In this case, the mean value of cooling level value is obtained by " integrating result/integrating number of times (being 10 times in this case) of cooling level value ", and the state of cooling is limited to " the cooling level of regulation is judged number+judgement amplitude/2 " on judging.This cooling level judges that number is as for example " 3 " (design temperature directly over the cooling level value of control zone 3), and judgement amplitude refers to the difference of regulation.
And, in step S3, judge in the situation that the upper limit is large than the state of cooling when the mean value of cooling level value, enter step S4 and judge that the state of cooling of showroom 23 is supercooling.In addition, in step S3, when the mean value of cooling level value is that the state of cooling is judged in the situation below the upper limit, enter step S5, judge specifically whether the mean value of cooling level value judges that than the state of cooling lower limit is little.This state of cooling is limited to " cooling level is judged number-judgement amplitude/2 " under judging.
In this step S5, judge in the situation that lower limit is little than the state of cooling when the mean value of cooling level value, enter step S7 and judge that the state of cooling of showroom 23 is cooling deficiency.In addition, in step S5, when the mean value of cooling level value is that the state of cooling is judged in situation more than lower limit,, be that the state of cooling is judged below the upper limit at the mean value of cooling level value, and judge in situation more than lower limit for the state of cooling, enter step S6, judges showroom 23 as neither supercooling neither cooling deficiency cooling suitable (OK).
Then, main control unit 12 enters step S8, judge and in identical refrigerant piping, whether have cooling not enough judgement,, in the each open Showcase 1 being connected with refrigerator 3 by refrigerant piping 7,8, whether be judged to be cooling deficiency, even have an open Showcase 1 that is judged to be cooling deficiency in the case of existing, enter step S12, for example send, so that low pressure setting value reduces regulation level (1 grade) is that the data of purport are to the end side control device 13 of refrigerator 2.The end side control device 13 of refrigerator 2 is to become the running frequency of mode control compressor 3 of the low pressure setting value being sent by main control unit 12, therefore, after low pressure setting value declines (low pressure of Fig. 5 is set and declined), the running frequency of compressor 3 is difficult for reducing, and the cooling capacity of each open Showcase 1 improves.
On the other hand, the in the situation that of being no in step S8, enter step S9, specifically judge in identical refrigerant piping, whether there is overcooled judgement,, in the each open Showcase 1 being connected with refrigerator 3 by refrigerant piping 7,8, whether be judged to be supercooling, even if exist have one to be judged to be overcooled open Showcase 1 in the situation that, enter step S10, sending the regulation level (for example 1 grade) so that low pressure setting value rises is that the data of purport are to the end side control device 13 of refrigerator 2.After low pressure setting value rises (low pressure of Fig. 5 is set and risen), the running frequency of compressor 3 easily reduces, and therefore, the cooling capacity of each open Showcase 1 reduces.
In addition, at step S9 be no in the situation that, in the case of both not had the open Showcase 1 of cooling deficiency not have overcooled open Showcase 1 in identical refrigerant piping yet, main control unit 12 sends to maintain low pressure and is set as the data of purport to the end side control device 13 of refrigerator 2, finishes to judge (low pressure of Fig. 5 is set and kept) at step S13.Thus, can cut down the power consumption of compressor 3, trouble-freely realize the cooling of each open Showcase 1, improve the operational efficiency of refrigerating plant R simultaneously.
As described in detail above, in the time that the refrigerant superheat degree with evaporimeter 9 becomes the valve opening of mode control expansion valve 11 of the target degree of superheat of regulation, set multiple control zones 1～4 taking the design temperature that blows out cold air temperature to showroom 23 as benchmark, in each control zone 1～4, change the target degree of superheat, therefore, can be according to the refrigerant superheat degree that blows out cold air temperature and adjusted by expansion valve 11 evaporimeter 9 to showroom 23, the effective area of evaporimeter 9 is changed.
And, in the control zone that more approaches design temperature, more make the target degree of superheat become large, therefore, can approach design temperature the effective area of evaporimeter 9 is diminished along with blowing out cold air temperature, make to blow out cold air temperature and stably approach design temperature.Therefore, the valve opening control of expansion valve 11 and highly stable to the both sides that blow out cold air temperature of showroom 23.In addition, become the control zone 4 below design temperature in the case of blowing out cold air temperature, make expansion valve 11 full cut-offs, therefore, also eliminated reliably the supercooling in showroom 23.
In addition, at the low pressure based on refrigerant loop, when becoming the running frequency of mode control compressor 3 of low pressure setting value of regulation, set cooling level value " 1 "～" 5 " of regulation in each control zone 1～4, judge the state of cooling of the showroom 23 of open Showcase 1 according to this cooling level value, and adjust low pressure setting value according to this result of determination.At this moment, under judging that according to cooling level value the state of cooling in the showroom 23 of arbitrary open Showcase 1 in identical refrigerant piping is as cooling deficiency, low pressure setting value is declined, the state of cooling of showroom 23 of judging arbitrary open Showcase 1 as overcooled situation under, make low pressure setting value increase, and, in the state of cooling of showroom 23 of judging all open Showcase 1 neither cooling deficiency nor be in overcooled situation, maintain low pressure setting value, therefore, can suitably control according to the state of cooling of the showroom of each open Showcase 1 23 running frequency of compressor 3, eliminate the cooling deficiency of the showroom 23 of each open Showcase 1, and, realization contributes to energy-conservation efficient operation.
Especially, main control unit is collected the cooling level value of each open Showcase 1 for more than 12 time, and the mean value of each cooling level value based on collecting is judged the state of cooling of the showroom 23 of each open Showcase 1, therefore, except the impact being brought by the temporary transient variation that blows out cold air temperature, can make according to the running frequency control stabilisation of the compressor 3 of low pressure setting value.
In addition, in an embodiment, the valve opening of using the refrigerating plant R being constructed by main control unit 12 and end side control device 13 to control expansion valve 11 is illustrated, but be not limited to this, also can according to the cold air temperature that blows out of the open Showcase 1 of self, the target degree of superheat of the evaporimeter 9 of self be changed in each control zone for end side control device 13, to control the valve opening of expansion valve 11.
In addition, for the cooling level value of judging the state of cooling of the showroom 23 of each open Showcase 1 for changing low pressure setting value, be not limited to the numerical value of embodiment, can, according to the scale of refrigerating plant R and purposes, carry out without departing from the spirit and scope of the invention various changes yet yet.
Claims (8)
1. an open Showcase, to blowing out in the showroom of display goods, to have carried out the cold air of heat exchange cooling to carry out with evaporimeter, it is characterized in that possessing:
Expansion valve, it is connected with the entrance side of described evaporimeter;
Blow out cold air temperature checkout gear, it is for detection of the cold air temperature that blows out to described showroom;
Evaporator superheat checkout gear, it is for detection of the refrigerant superheat degree of described evaporimeter;
Control device, the valve opening of described expansion valve is controlled in its output based on each checkout gear,
This control device becomes the valve opening of expansion valve described in the mode control of the target degree of superheat of regulation with the refrigerant superheat degree of described evaporimeter, and,
Set multiple control zones taking the design temperature that blows out cold air temperature to described showroom as benchmark, in each control zone, change the described target degree of superheat.
2. open Showcase as claimed in claim 1, is characterized in that,
In the described control zone that approaches described design temperature, described control device more increases the described target degree of superheat.
3. open Showcase as claimed in claim 2, is characterized in that,
Described, blow out cold air temperature and become below described design temperature in the situation that, described control device makes described expansion valve full cut-off.
4. a refrigerating plant, possess many as the open Showcase of any one in claim 1～3, from thering is the refrigerator of compressor that forms the refrigerant loop of regulation with the evaporimeter of described each open Showcase to the evaporimeter the supply system cryogen of described each open Showcase, it is characterized in that
The low pressure of described control device based on described refrigerant loop to be to become the operation of compressor described in the mode control of low pressure setting value of regulation, and,
Set the cooling level value of regulation in each described control zone, judge the state of cooling of the showroom of described open Showcase based on this cooling level value, adjust described low pressure setting value based on this result of determination.
5. refrigerating plant as claimed in claim 4, is characterized in that,
Described control device as cooling deficiency, declines described low pressure setting value in the state of cooling of showroom of judging described open Showcase according to described cooling level value.
6. the refrigerating plant as described in claim 4 or 5, is characterized in that,
Described control device the state of cooling of showroom of judging described open Showcase according to described cooling level value as overcooled situation under, make described low pressure setting value increase.
7. the refrigerating plant as described in any one in claim 4～6, is characterized in that,
Described control device in the state of cooling of showroom of judging described open Showcase according to described cooling level value neither cooling deficiency nor be in overcooled situation maintains described low pressure setting value.
8. the refrigerating plant as described in any one in claim 4～7, is characterized in that,
Described control device is repeatedly collected described cooling level value, and the mean value of the each cooling level value based on collecting is judged the state of cooling of the showroom of described open Showcase.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-068719 | 2013-03-28 | ||
| JP2013068719A JP2014190657A (en) | 2013-03-28 | 2013-03-28 | Open showcase and refrigerator including the same |
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| CN104068688A true CN104068688A (en) | 2014-10-01 |
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| CN201410115311.2A Pending CN104068688A (en) | 2013-03-28 | 2014-03-26 | Open-type display cabinet and refrigeration device thereof |
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| CN (1) | CN104068688A (en) |
Cited By (3)
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| CN108903482A (en) * | 2018-07-03 | 2018-11-30 | 合肥亚卡普机械科技有限公司 | A kind of automatic rotary displaying device of constant temperature |
| CN110822635A (en) * | 2019-09-26 | 2020-02-21 | 宁波工程学院 | Dynamic control method of electronic expansion valve during refrigeration of capillary radiation air conditioner |
| CN111407123A (en) * | 2020-04-24 | 2020-07-14 | 珠海格力电器股份有限公司 | Control method for reducing temperature fluctuation, temperature control device and display cabinet |
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| JP6625802B2 (en) * | 2015-03-16 | 2019-12-25 | 株式会社東芝 | Radiation shielding cooling system and radiation shielding cooling method for nuclear power plant |
| CN115823786A (en) * | 2022-12-08 | 2023-03-21 | 珠海格力电器股份有限公司 | Unit anti-freezing control method and device and water chilling unit |
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| CN111407123A (en) * | 2020-04-24 | 2020-07-14 | 珠海格力电器股份有限公司 | Control method for reducing temperature fluctuation, temperature control device and display cabinet |
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|---|---|
| JP2014190657A (en) | 2014-10-06 |
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