CN204285882U - A kind of supermarket cold chain system - Google Patents
A kind of supermarket cold chain system Download PDFInfo
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- CN204285882U CN204285882U CN201420561145.4U CN201420561145U CN204285882U CN 204285882 U CN204285882 U CN 204285882U CN 201420561145 U CN201420561145 U CN 201420561145U CN 204285882 U CN204285882 U CN 204285882U
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- carbon dioxide
- temperature refrigerating
- refrigerating system
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- middle temperature
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Abstract
The utility model provides a kind of supermarket cold chain system, comprise high temperature refrigerating system, middle temperature refrigerating system and deepfreeze system, wherein deepfreeze system adopts the straight swollen system of carbon dioxide, comprise carbon-dioxide gas compressor, cryogenic vaporizer, middle temperature refrigerating system comprises middle temperature evaporimeter, fluid reservoir, high temperature refrigerating system comprises high temperature compressor, condenser, feed flow/return-air plate changes, high temperature refrigerating system adopts water-cooled condenser system, between described high temperature refrigerating system and middle temperature refrigerating system, there is overlapping plate to change, also carbon dioxide pump is provided with in middle temperature refrigerating system, carbon dioxide pump is communicated with overlapping plate and changes and fluid reservoir.The utility model is by combining superposition type system and pumping system, deepfreeze system adopts the straight swollen system of carbon dioxide, middle temperature refrigerating system adopts the indirect cool cycles of pumping carbon dioxide, the cold condenser system of Bound moisture makes the HFC class cold-producing medium of overlapping high-temperature level system only at machine room Inner eycle simultaneously, greatly reduces the use amount of HFC class cold-producing medium.
Description
Technical field
The utility model belongs to refrigeration system technical field, specifically, relates to a kind of supermarket cold chain system.
Background technology
In decades recently, along with people to damage the ozone layer to CFC series cold-producing medium and the understanding of HCFC, HFC series cold-producing medium greenhouse effects side effect, environmentally friendly natural refrigerant carbon dioxide obtains paying close attention to more and more widely in commercial refrigeration field.
In view of the pressure that carbon dioxide refrigerating system is relatively high, be in security of system and energy-conservation consideration, general employing superposition type system in supermarket cold chain (freezing and refrigerating system).Superposition type system as shown in Figure 1, comprise high temperature refrigerating system a, middle temperature refrigerating system b and deepfreeze system c, wherein deepfreeze system c adopts the straight swollen system of carbon dioxide, comprise carbon-dioxide gas compressor c1, cryogenic vaporizer c2, electric expansion valve c3, fluid reservoir c4, middle temperature refrigerating system b comprises middle temperature evaporimeter b1, have overlapping plate between middle temperature refrigerating system b and deepfreeze system c and change d, high temperature refrigerating system a comprises high temperature compressor a1, condenser a2, feed flow/return-air plate changes a3, and high temperature refrigerating system a adopts water-cooled condenser system.
In this superposition type system, the condensation under the relatively lower temp that carbon dioxide provides at high temperature refrigerating system, effectively solves the problem that the high carbon dioxide system operating pressure caused of environment temperature is too high.But adopt in the supermarket cold chain of this conventional superposition type system, middle temperature refrigerating system b still adopts HFC class cold-producing medium (R134a), just change the cold-producing medium of deepfreeze system c into carbon dioxide (R744), it is still larger on the impact of environment.
Utility model content
The utility model provides a kind of supermarket cold chain system, and based on natural refrigerant carbon dioxide, object is the use amount as far as possible reducing CFC series cold-producing medium and HCFC, HFC series cold-producing medium, reduces its impact on environment.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of supermarket cold chain system, comprise high temperature refrigerating system, middle temperature refrigerating system and deepfreeze system, wherein deepfreeze system adopts the straight swollen system of carbon dioxide, comprise carbon-dioxide gas compressor, cryogenic vaporizer, middle temperature refrigerating system comprises middle temperature evaporimeter, fluid reservoir, high temperature refrigerating system comprises high temperature compressor, condenser, feed flow/return-air plate changes, high temperature refrigerating system adopts water-cooled condenser system, between described high temperature refrigerating system and middle temperature refrigerating system, there is overlapping plate to change, also carbon dioxide pump is provided with in described middle temperature refrigerating system, carbon dioxide pump is communicated with overlapping plate and changes and fluid reservoir, namely in, warm refrigerating system adopts pumping carbon dioxide system, the cold-producing medium circulated in middle temperature evaporimeter is carbon dioxide.
Further, described carbon dioxide pump is provided with three bypass solenoid valves.
Further, described carbon dioxide pump adopts variable frequency pump.
Further, the flow of each described bypass solenoid valve accounts for 1/3 of the minimum running frequency flow of variable frequency pump.
The utility model for be supermarket cold chain system, be a huger freezing and refrigerating system, pipeline is longer, cold-producing medium use amount is large, adopting cold chain system of the present utility model, is exactly based on carbon dioxide, reduces the use amount of CFC series cold-producing medium and HCFC series cold-producing medium as much as possible.
Compared with prior art, advantage of the present utility model and good effect are:
The utility model is by combining superposition type system and pumping system.Deepfreeze system adopts the straight swollen system of carbon dioxide, middle temperature refrigerating system adopts the indirect cool cycles of pumping carbon dioxide, the cold condenser system of Bound moisture makes the HFC class cold-producing medium of overlapping high-temperature level system only at machine room Inner eycle simultaneously, greatly reduces the use amount of HFC class cold-producing medium.
Accompanying drawing explanation
Fig. 1 is the folding type cooling system flow chart that existing supermarket cold chain system adopts;
Fig. 2 is the schematic flow sheet of the specific embodiment of supermarket described in the utility model cold chain system;
Fig. 3 is carbon dioxide pump control flow schematic diagram.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Shown in figure 2, the present embodiment is a kind of supermarket cold chain system, comprise high temperature refrigerating system 1, middle temperature refrigerating system 2 and deepfreeze system 3, wherein deepfreeze system 3 adopts the straight swollen system of carbon dioxide, comprise carbon-dioxide gas compressor 31, cryogenic vaporizer 32, electric expansion valve 33, middle temperature refrigerating system 2 comprises middle temperature evaporimeter 21, fluid reservoir 22, carbon dioxide pump 23, carbon dioxide pump 23 is communicated with overlapping plate and changes 4 and fluid reservoir 22, high temperature refrigerating system 1 comprises high temperature compressor 11, condenser 12, feed flow/return-air plate changes 13, between high temperature refrigerating system 1 and middle temperature refrigerating system 2, there is overlapping plate and change 4, like this, middle temperature refrigerating system 2 adopts pumping carbon dioxide system, in middle temperature evaporimeter 21, the cold-producing medium of circulation is carbon dioxide, high temperature refrigerating system 1 adopts water-cooled condenser system,
Wherein, carbon dioxide pump 23 adopts variable frequency pump, is provided with three bypass solenoid valves 5 on its side, and the flow of each bypass solenoid valve 5 accounts for 1/3 of the minimum running frequency flow of variable frequency pump.
Generally, in the cold chain of supermarket, high temperature refers to more than 12 DEG C, and middle temperature refers to 0-4 DEG C, and low temperature refers to lower than-18 DEG C.
The utility model for be huge supermarket cold chain system, in conjunction with superposition type system and pumping system, middle gentle deepfreeze system is all adopted carbon dioxide coolant, greatly reduce CFC series cold-producing medium and HCFC series cold-producing medium use amount.
Compared to conventional refrigerant, carbon dioxide has the feature of low critical point and high three phase point, and viscosity is little at low temperatures for carbon dioxide liquid simultaneously, and flow resistance is little, and has good heat conductivility and heat exchange efficiency.But also there is following problem in pumping carbon dioxide in application process:
1, when the end-equipment thermic load of central temperature refrigerating system 2 increases suddenly, the change of load can be passed to overlapping plate and change 4 by heat exchange property that pumping carbon dioxide is good fast, and now the compressor start of high-temperature systems is often delayed, system high pressure may be caused to protect;
The pressure carbon dioxide of terminal pressure warm system is namely adopted directly to control the operation of high-temperature level compressor for this problem the utility model, namely the pressure of fluid reservoir directly controls the unlatching of high temperature compressor, greatly can shorten the response time of high temperature compressor.
High temperature compressor controls to improve front flow process:
The electric expansion valve open degree increase → high temperature side pressure of inspiration(Pi) raising → high temperature side compressor start → carbon dioxide condensing pressure drop of the degree of superheat raising → high temperature side of the load increase → high temperature side that carbon dioxide condensing load → carbon dioxide condensing pressure rising → overlapping plate changes;
Flow process after improving:
The load that carbon dioxide condensing load → carbon dioxide condensing pressure rising → overlapping plate changes increases, simultaneously the electric expansion valve open degree increase → carbon dioxide condensing pressure drop of the degree of superheat raising → high temperature side of high temperature side compressor start → high temperature side.
Control in former flow process adopts one way transmission, and especially the raising of the degree of superheat and the increase of electric expansion valve open degree are all processes slowly, and the time is longer.So high temperature compressor can be caused to start delayed.And after improving, directly controlled the compressor of high-temperature level by the pressure of carbon dioxide.After the pressure of carbon dioxide raises, high temperature compressor directly starts, the startup of compressor can reduce rapidly the pressure of inspiration(Pi) of high temperature side, simultaneously because the increase of load makes suction temperature raise, the acting in conjunction of the two makes the degree of superheat of high temperature side increase rapidly, electric expansion valve also can be opened rapidly, shortens the response time of high-temperature level compressor, thus efficiently solves because the large problem of the pressurized carbon dioxide fluctuation that causes of carbon dioxide side load variations.
2, when the end-equipment thermic load of central temperature refrigerating system reduces suddenly, the demand of carbon dioxide reduces rapidly, and carbon dioxide pump discharge pressure may be caused to raise rapidly, and system high pressure may be caused equally to protect.
And the utility model is in the control of carbon dioxide flow, three leg bypass are adopted to add the control mode of variable frequency pump combination, the bypass flow of every bar branch road is about 1/3 of the minimum running frequency flow of pump, both the normal operation of pumping system during warm refrigerating system zero load in can ensureing, under different load state can being ensured again, the flow that pumping system can provide stable pressure head and continue, carbon dioxide pump control flow as shown in Figure 3.
The above, it is only preferred embodiment of the present utility model, be not restriction the utility model being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solutions of the utility model content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present utility model, still belong to the protection domain of technical solutions of the utility model.
Claims (4)
1. a supermarket cold chain system, comprise high temperature refrigerating system, middle temperature refrigerating system and deepfreeze system, wherein deepfreeze system adopts the straight swollen system of carbon dioxide, comprise carbon-dioxide gas compressor, cryogenic vaporizer, middle temperature refrigerating system comprises middle temperature evaporimeter, fluid reservoir, high temperature refrigerating system comprises high temperature compressor, condenser, feed flow/return-air plate changes, high temperature refrigerating system adopts water-cooled condenser system, it is characterized in that: between described high temperature refrigerating system and middle temperature refrigerating system, there is overlapping plate and change, also carbon dioxide pump is provided with in described middle temperature refrigerating system, carbon dioxide pump is communicated with overlapping plate and changes and fluid reservoir.
2. supermarket cold chain system according to claim 1, is characterized in that: described carbon dioxide pump is provided with three bypass solenoid valves.
3. supermarket cold chain system according to claim 2, is characterized in that: described carbon dioxide pump adopts variable frequency pump.
4. supermarket cold chain system according to claim 3, is characterized in that: the flow of each described bypass solenoid valve accounts for 1/3 of the minimum running frequency flow of variable frequency pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420561145.4U CN204285882U (en) | 2014-09-28 | 2014-09-28 | A kind of supermarket cold chain system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420561145.4U CN204285882U (en) | 2014-09-28 | 2014-09-28 | A kind of supermarket cold chain system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204285882U true CN204285882U (en) | 2015-04-22 |
Family
ID=52869033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420561145.4U Withdrawn - After Issue CN204285882U (en) | 2014-09-28 | 2014-09-28 | A kind of supermarket cold chain system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204285882U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105091390A (en) * | 2015-09-11 | 2015-11-25 | 南通百源制冷设备有限公司 | Direct freezing device for liquid carbon dioxide |
| CN105526728A (en) * | 2014-09-28 | 2016-04-27 | 青岛海尔开利冷冻设备有限公司 | Supermarket cold chain system |
| CN106895640A (en) * | 2017-03-09 | 2017-06-27 | 天津商业大学 | A kind of superposition type is segmented quick-frozen and cold and heat combined supply instant freezer |
-
2014
- 2014-09-28 CN CN201420561145.4U patent/CN204285882U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526728A (en) * | 2014-09-28 | 2016-04-27 | 青岛海尔开利冷冻设备有限公司 | Supermarket cold chain system |
| CN105526728B (en) * | 2014-09-28 | 2018-06-15 | 青岛海尔开利冷冻设备有限公司 | A kind of supermarket's cold chain system |
| CN105091390A (en) * | 2015-09-11 | 2015-11-25 | 南通百源制冷设备有限公司 | Direct freezing device for liquid carbon dioxide |
| CN106895640A (en) * | 2017-03-09 | 2017-06-27 | 天津商业大学 | A kind of superposition type is segmented quick-frozen and cold and heat combined supply instant freezer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150422 Effective date of abandoning: 20180615 |