CN104068689A - Open-type display cabinet - Google Patents
Open-type display cabinet Download PDFInfo
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- CN104068689A CN104068689A CN201410116567.5A CN201410116567A CN104068689A CN 104068689 A CN104068689 A CN 104068689A CN 201410116567 A CN201410116567 A CN 201410116567A CN 104068689 A CN104068689 A CN 104068689A
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- temperature
- cold air
- showroom
- air temperature
- cooling
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- Freezers Or Refrigerated Showcases (AREA)
Abstract
The invention provides an open-type display cabinet, which can be used to reliably keeping the cool temperature in the display cabinet, even when the blown cool temperature is controlled to be at the set temperature.the open-type display cabinet (1) can be used to cool the goods in the display chamber by blowing the cool wind for the heat exchange with an evaporator (9). The open-type display cabinet is provided with a main control device (12) and a terminal side control device (13), which is used to control the blown cool wind temperature and change the temperature into the predetermined set temperature based on the output of the temperature sensor. The cooling state can be determined based on the output of the temperature sensor of the display cabinet, and the set temperature of the blown cool wind temperature can be adjusted according to the determination result.
Description
Technical field
The open Showcase displaying when the present invention relates to a kind of cooling commodity.
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.
At this, in the case of the temperature in the space to cooling is controlled, although be to control according to the temperature in this space, because the showroom of open Showcase is open all the time, therefore, the control difficulty of the temperature in this showroom.So general knowledge is in this open Showcase, the temperature of the cold air that this showroom of subtend blows out blows out cold air temperature the design temperature of regulation is set, and the mode that becomes this design temperature to blow out cold air temperature is controlled.
Patent documentation 1: TOHKEMY 2007-255845 communique
But the temperature of setting in the time of listing in advance because this design temperature that blows out cold air temperature uses serviceability temperature band that should open Showcase, therefore, exists along with the excessively cold problem compared with environment in the shop such as low and in showroom of the temperature in shop.In addition, dropping in the situations such as a large amount of cooling load (a large amount of commodity that temperature is high etc.), also can produce in showroom not cold always problem in showroom.
Summary of the invention
The present invention sets up in order to solve above-mentioned existing technical task just, and its object is, even if provide a kind of by blow out cold air temperature and be controlled at design temperature in the situation that, also can make reliably open Showcase cooling in showroom.
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: blow out cold air temperature checkout gear, it is for detection of the cold air temperature that blows out to showroom; Temperature-detecting device in showroom, it detects the temperature in showroom; Control device, its output based on blowing out cold air temperature checkout gear, control blows out cold air temperature so that it becomes the design temperature of regulation, this control device is judged the state of cooling of showroom based on the output of temperature-detecting device in showroom, and adjustment blows out the design temperature of cold air temperature based on result of determination.
The open Showcase of second aspect present invention, in foregoing invention, is characterized in that, control device the state of cooling of judging showroom as overcooled situation under, make the design temperature that blows out cold air temperature increase.
The open Showcase of third aspect present invention, in foregoing invention, is characterized in that, control device the state of cooling of judging showroom as overcooled situation under, make the design temperature that blows out cold air temperature increase.
The open Showcase of fourth aspect present invention, in foregoing invention, is characterized in that, control device is being judged the state of cooling of showroom neither cooling deficiency nor be in overcooled situation maintains the design temperature that blows out cold air temperature.
The open Showcase of fifth aspect present invention, in above-mentioned each invention, is characterized in that, control device is repeatedly collected the output of temperature-detecting device in showroom, and the mean value of the output based on collected is judged the state of cooling of the showroom of open Showcase.
The open Showcase of sixth aspect present invention, in above-mentioned each invention, is characterized in that possessing: expansion valve, and it is connected with the entrance side of evaporimeter; Evaporator superheat checkout gear, it is for detection of the refrigerant superheat degree of evaporimeter, 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, approach this and blow out the design temperature of cold air temperature and make the target degree of superheat become large along with blowing out cold air temperature.
The open Showcase of seventh aspect present invention, in foregoing invention, is characterized in that, control device is set multiple control zones taking the design temperature that blows out cold air temperature as benchmark, changes the target degree of superheat in each control zone.
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: blow out cold air temperature checkout gear, it is for detection of the cold air temperature that blows out to showroom, temperature-detecting device in showroom, it detects the temperature in showroom, control device, its output based on blowing out cold air temperature checkout gear, control blows out cold air temperature so that it becomes the design temperature of regulation, this control device is judged the state of cooling of showroom based on the output of temperature-detecting device in showroom, and adjustment blows out the design temperature of cold air temperature based on result of determination, therefore, the control device of for example second aspect present invention in the state of cooling of judging showroom as cooling deficiency, reduce by making to blow out under the design temperature of cold air temperature, thereby the cooling load in showroom for example increases suddenly, can make to blow out cold air temperature declines so that promptly cooling in showroom.
In addition, for example, described in third aspect present invention, control device the state of cooling of judging showroom as overcooled situation under, by making the design temperature that blows out cold air temperature increase, thereby the in the situation that environment reason becoming cold in for example due to shop, can make to blow out cold air temperature and rise to eliminate the supercooling in showroom.
And, for example, described in fourth aspect present invention, control device in the state of cooling of judging showroom neither cooling deficiency nor be in overcooled situation, by maintaining the design temperature that blows out cold air temperature, can stably maintain the temperature in showroom, by more than, in a word reliably in cooling showroom.
In this case, as described in fifth aspect present invention, as long as the output that control device is repeatedly collected temperature-detecting device in showroom, and the mean value of output based on collected is judged the state of cooling of the showroom of open Showcase, the impact that variation of the temperature in the showroom by temporary transient brings, can make to blow out the control stabilisation of cold air temperature.
In addition, as described in sixth aspect present invention, as long as possess: expansion valve, it is connected with the entrance side of evaporimeter, evaporator superheat checkout gear, it is for detection of the refrigerant superheat degree of evaporimeter, 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, approach this and blow out the design temperature of cold air temperature and make the target degree of superheat become large along with blowing out cold air temperature, for example seventh aspect present invention, set multiple control zones by the design temperature to blow out cold air temperature as benchmark, and change the target degree of superheat in each control zone, thereby 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, blow out the design temperature of cold air temperature by adjustment, can make the effective area of evaporimeter change, and reliably and stably control showroom cooling of open Showcase.
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 that the design temperature that blows out cold air temperature of the open Showcase of Fig. 1 is adjusted;
Fig. 5 is the figure that the design temperature that blows out cold air temperature of key diagram 4 is adjusted.
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)
37 showroom temperature sensors (temperature-detecting device in showroom)
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 23Nei top, showroom, forms the showroom temperature sensor of temperature-detecting device in the showroom in embodiment, 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) blow out the design temperature adjustment of cold air temperature
Below, describe with reference to the adjustment of the design temperature that blows out cold air temperature of the showroom 23 of Fig. 4 and Fig. 5 subtend open Showcase 1.Fig. 4 represents the control flow of main control unit 12.Main control unit 12 is collected the data of the current display indoor temperature being sent by the end side control device 13 of each open Showcase 1 in the step S1 of Fig. 4 in each minute, and it is repeated to 10 minutes in an embodiment (, 10 times).
In addition, display in an embodiment the temperature (output) that indoor temperature adopts the showroom temperature sensor 37 being sent by end side control device 13 to detect, but be not limited to this, in the temperature that also can detect at above-mentioned showroom temperature sensor 37, add blowing out of blowing out that temperature sensor 36 the detects suction cold air temperature that cold air temperature and inlet temperature sensor 38 detect to infer the temperature estimation in showroom.Accordingly, can hold more accurately the temperature of showroom 23 entirety.
Then, enter step S2, judge one by one whether the mean value (on average displaying indoor temperature) of the display indoor temperature of 10 minutes of each open Showcase 1 judges upper limit for height than the state of cooling.In this case, the state of cooling is limited to " design temperature+temperature amplitude/2, showroom " on judging.This showroom design temperature is for example+5 DEG C in refrigeration open Showcase, in freezing open Showcase, is for example-20 DEG C of left and right, and temperature amplitude refers to the difference of regulation.
And, in step S2, judge in the situation of upper limit for height than the state of cooling when average display indoor temperature, entering the state of cooling that step S4 is judged to be showroom 23 is cooling deficiency.In addition, in step S2, when average display indoor temperature is that the state of cooling is judged in the situation below the upper limit, enter step S3, whether the average display of current judgement indoor temperature judges that than the state of cooling lower limit is low.This state of cooling is limited to " design temperature-temperature amplitude/2, showroom " under judging.
In this step S3, judge in the low situation of lower limit than the state of cooling when average display indoor temperature, entering the state of cooling that step S6 is judged to be showroom 23 is supercooling.In addition, in step S3, when average display indoor temperature is in the situation that the state of cooling judges that lower limit is above,, be that the state of cooling is judged below the upper limit in average display indoor temperature, and judge in situation more than lower limit for the state of cooling, enter step S5, be judged to be showroom 23 for neither supercooling neither cooling deficiency cooling suitably.
In the situation that main control unit 12 is judged showroom 23 as cooling deficiency in step S4, enter step S7, make to blow out the design temperature decline setting (setting of Fig. 5 declines) of cold air temperature.Blow out after the design temperature decline of cold air temperature, in Fig. 3, the overall step-down in control zone 2～4, the target degree of superheat is also not variable large.Thus, in this open Showcase 1, the effective area of evaporimeter 9 becomes larger, therefore, blows out cold air temperature and becomes lower, and showroom 23 is interior further by cooling by force.
In addition, in step S6, judge that at main control unit 12 showroom 23 is as overcooled situation under, enter the design temperature rising setting that step S9 makes to blow out cold air temperature (setting of Fig. 5 is risen).Blow out after the design temperature rising of cold air temperature, in Fig. 3, control zone 2～4 entirety uprise, and it is large that the target degree of superheat also becomes quickly.Thus, in this open Showcase 1, the effective area of evaporimeter 9 becomes less, therefore, blows out cold air temperature and becomes higher, and cooling in showroom 23 becomes more weak.
In addition, the in the situation that of judging showroom 23 as cooling suitably (OK) in step S5 at main control unit 12, enter step S8 and maintain the design temperature (setting of Fig. 5 keeps) that blows out cold air temperature.And, finish to judge at step S10.Thus, blow out the design temperature of cold air temperature according to the state of cooling adjustment of the showroom 23 of the temperature based in showroom, can control the cooling capacity in showroom 23.
As described in detail above, in the present invention, main control unit 12 is judged the state of cooling of showroom 23 according to display indoor temperature, and adjustment blows out the design temperature of cold air temperature according to result of determination.And, in the state of cooling of judging showroom 23 as cooling deficiency, the design temperature that blows out cold air temperature is declined, therefore, for example in situation of a large amount of commodity of the interior input in showroom 23 etc., in the situation that cooling load increases suddenly, can make to blow out cold air temperature and decline so that promptly cooling in showroom 23.
In addition, the state of cooling of judging showroom 23 as overcooled situation under, make the design temperature that blows out cold air temperature increase, therefore, temperature in shop such as compared with low grade due to environment in shop make to become in showroom 23 cold, can make to blow out cold air temperature and rise to eliminate the supercooling in showroom 23.
And, judging the state of cooling of showroom 23 neither cooling deficiency nor be in overcooled situation maintains the design temperature that blows out cold air temperature, therefore, can stably maintain the temperature in showroom 23, thus, reliably in cooling showroom 23.
In this case, main control unit is collected the data of display indoor temperature for more than 23 time, judge the state of cooling of the showroom 23 of open Showcase 1 according to the mean value of the data of collecting, therefore, the impact that the variation of the temperature in the showroom 23 by temporary transient brings, can make to blow out the control stabilisation of cold air temperature.
In addition, with along with blowing out that cold air temperature approaches design temperature and the target degree of superheat of controlling the evaporimeter 9 of expansion valve 11 becomes large mode, set multiple control zones taking the design temperature that blows out cold air temperature as benchmark, in each control zone, 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.
Thus, blow out the design temperature of cold air temperature by adjustment, can make the effective area of evaporimeter 9 change, and reliably and stably control showroom 23 cooling of open Showcase 1.
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 be the display indoor temperature of the open Showcase 1 of end side control device 13 based on self, judge that the state of cooling, to adjust the design temperature that blows out cold air temperature of self, makes the target degree of superheat of the evaporimeter 9 of self change to control the valve opening of expansion valve 11 in each control zone.
In addition, outside aspect sixth aspect present invention and the 7th, the design temperature that is not limited to blow out cold air temperature is benchmark changes target degree of superheat control in each control zone, for example, according to the valve opening that blows out cold air temperature and its design temperature and directly control expansion valve 11, it is also effective controlling in situation about supplying with to the cold-producing medium of evaporimeter 9.
Claims (7)
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:
Blow out cold air temperature checkout gear, it is for detection of the cold air temperature that blows out to described showroom;
Temperature-detecting device in showroom, it detects the temperature in described showroom;
Control device, it is based on the described output that blows out cold air temperature checkout gear, blows out cold air temperature so that it becomes the design temperature of regulation described in control,
The state of cooling of described showroom is judged in the output of this control device based on temperature-detecting device in described showroom, and design temperature based on blowing out cold air temperature described in result of determination adjustment.
2. open Showcase as claimed in claim 1, is characterized in that,
Described control device is in the state of cooling of judging described showroom as cooling deficiency, and the design temperature that blows out cold air temperature described in making declines.
3. open Showcase as claimed in claim 1 or 2, is characterized in that,
Described control device the state of cooling of judging described showroom as overcooled situation under, the design temperature that blows out cold air temperature described in making rises.
4. the open Showcase as described in any one in claim 1～3, is characterized in that,
Described control device is being judged the state of cooling of described showroom neither cooling deficiency nor be in overcooled situation blows out the design temperature of cold air temperature described in maintaining.
5. the open Showcase as described in any one in claim 1～4, is characterized in that,
Described control device is repeatedly collected the output of temperature-detecting device in described showroom, and the mean value of the output based on collected is judged the state of cooling of the showroom of open Showcase.
6. the open Showcase as described in any one in claim 1～5, is characterized in that, possesses:
Expansion valve, it is connected with the entrance side of described evaporimeter;
Evaporator superheat checkout gear, it is for detection of the refrigerant superheat degree of described evaporimeter,
Described 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,
Along with the described cold air temperature that blows out approaches this and blows out the design temperature of cold air temperature and make the described target degree of superheat become large.
7. open Showcase as claimed in claim 6, is characterized in that,
Described control device is set multiple control zones taking the described design temperature that blows out cold air temperature as benchmark, changes the described target degree of superheat in each control zone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013068738A JP6145867B2 (en) | 2013-03-28 | 2013-03-28 | Open showcase |
| JP2013-068738 | 2013-03-28 |
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| Publication Number | Publication Date |
|---|---|
| CN104068689A true CN104068689A (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410116567.5A Pending CN104068689A (en) | 2013-03-28 | 2014-03-26 | Open-type display cabinet |
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| Country | Link |
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| JP (1) | JP6145867B2 (en) |
| CN (1) | CN104068689A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6949609B2 (en) * | 2017-08-01 | 2021-10-13 | 株式会社鷺宮製作所 | Control devices, control methods, and control programs |
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| JP2005030679A (en) * | 2003-07-14 | 2005-02-03 | Mitsubishi Electric Corp | Refrigerating air conditioner and control method for refrigerating air conditioner |
| US20080276636A1 (en) * | 2005-03-18 | 2008-11-13 | Danfoss A/S | Method For Controlling a Refrigeration System |
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| JP2010071609A (en) * | 2008-09-22 | 2010-04-02 | Sanyo Electric Co Ltd | Open showcase |
| JP2012112580A (en) * | 2010-11-24 | 2012-06-14 | Fuji Electric Co Ltd | Showcase |
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| JPS5774773U (en) * | 1980-10-28 | 1982-05-08 | ||
| JP4026624B2 (en) * | 1995-12-07 | 2007-12-26 | 富士電機リテイルシステムズ株式会社 | Showcase cooling system |
| JP4237023B2 (en) * | 2003-09-30 | 2009-03-11 | 三洋電機株式会社 | Showcase control device |
| JP4767065B2 (en) * | 2006-03-30 | 2011-09-07 | 三洋電機株式会社 | Commercial refrigerator |
| JP2008138915A (en) * | 2006-11-30 | 2008-06-19 | Daikin Ind Ltd | Refrigerating device |
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| JP2005030679A (en) * | 2003-07-14 | 2005-02-03 | Mitsubishi Electric Corp | Refrigerating air conditioner and control method for refrigerating air conditioner |
| US20080276636A1 (en) * | 2005-03-18 | 2008-11-13 | Danfoss A/S | Method For Controlling a Refrigeration System |
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| Publication number | Publication date |
|---|---|
| JP2014188306A (en) | 2014-10-06 |
| JP6145867B2 (en) | 2017-06-14 |
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