CN215809420U - Frostless type freezer - Google Patents
Frostless type freezer Download PDFInfo
- Publication number
- CN215809420U CN215809420U CN202122178523.3U CN202122178523U CN215809420U CN 215809420 U CN215809420 U CN 215809420U CN 202122178523 U CN202122178523 U CN 202122178523U CN 215809420 U CN215809420 U CN 215809420U
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- evaporator
- electronic expansion
- outlet
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010257 thawing Methods 0.000 claims abstract description 53
- 238000005057 refrigeration Methods 0.000 claims abstract description 50
- 238000007791 dehumidification Methods 0.000 claims abstract description 25
- 239000003507 refrigerant Substances 0.000 claims abstract description 12
- 230000009977 dual effect Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Landscapes
- Defrosting Systems (AREA)
Abstract
The utility model discloses a frost-free type refrigeration house. The frost-free type refrigeration house comprises a compressor, a condenser, a first electronic expansion valve, an evaporator and a dehumidifying heat exchanger, wherein the dehumidifying heat exchanger is arranged at the return air front end of the evaporator and is connected with the return air front end of the evaporator in parallel, an outlet pipeline of the first electronic expansion valve is communicated with the evaporator and the dehumidifying heat exchanger through a first branch and a second branch respectively, a second electronic expansion valve is arranged on the second branch, and refrigerants at an outlet of the evaporator and an outlet of the dehumidifying heat exchanger are mixed and then enter the compressor for recycling through an air suction pipeline. The utility model can ensure that the evaporator of the refrigeration house can not frost in the environment with lower humidity through the continuous dehumidification of the dehumidification heat exchanger. The utility model also comprises a defrosting loop, which can make the unit refrigerate and defrost at the same time and reduce the influence of defrosting on the fluctuation of the storage temperature.
Description
Technical Field
The utility model relates to the technical field of air conditioners, in particular to a frost-free type refrigeration house.
Background
The refrigeration machine set of the refrigeration house needs to work below 0 ℃, and the humidity in the refrigeration house is high due to frequent entering and exiting of part of the refrigeration house, so that the phenomenon of internal machine frosting is easily caused. The frosting of the inner machine can reduce the air quantity passing through the evaporator, influence the heat exchange and cause the inner machine to work normally in serious conditions. Therefore, defrosting is needed for the refrigeration house refrigerating units at the temperature of 0 ℃ or below, but the unit defrosting influences the normal refrigeration of the units, and has the defects of large power consumption, large storage temperature fluctuation and the like. At present, conventional defrosting modes comprise methods such as electric heating defrosting, hot fluorine defrosting (heating defrosting by reversing through a four-way valve), hot gas bypass defrosting and the like, and the defrosting methods are based on defrosting after a unit frosts, so that a refrigerating unit frequently operates in a refrigeration-defrosting cycle, the temperature in a refrigeration house fluctuates, and the quality of stored articles is not guaranteed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a frost-free type refrigerator, which aims to solve the problem of temperature fluctuation in the refrigerator caused by frequent defrosting of the conventional refrigerator.
The utility model provides a frost-free type refrigeration house which comprises a compressor, a first electronic expansion valve, an evaporator and a dehumidifying heat exchanger, wherein the dehumidifying heat exchanger is arranged at the front end of the evaporator and is connected with the front end of the evaporator in parallel, an outlet pipeline of the first electronic expansion valve is respectively communicated with the evaporator and the dehumidifying heat exchanger through a first branch and a second branch, the second branch is provided with a second electronic expansion valve, and refrigerants at an outlet of the evaporator and an outlet of the dehumidifying heat exchanger are mixed and then enter the compressor for recycling through an air suction pipeline.
The frost-free type refrigeration house provided by the utility model further comprises a condenser and a defrosting loop, wherein the defrosting loop is composed of a third branch led out from the condenser air inlet pipeline to the inlet of the dehumidifying heat exchanger and a fourth branch led out from the condenser outlet pipeline to the outlet of the dehumidifying heat exchanger, the third branch is provided with a first hot air electromagnetic valve, the fourth branch is provided with a second hot air electromagnetic valve, and the outlet pipeline of the dehumidifying heat exchanger is provided with a defrosting stop valve.
And a drying filter, a first electronic expansion valve, a filter and a liquid supply stop valve are sequentially arranged on the outlet pipeline of the condenser.
And an air suction stop valve and an air suction filter are sequentially arranged on a mixing pipeline of the outlet of the evaporator and the outlet of the dehumidifying heat exchanger.
The frost-free type refrigerator comprises a refrigeration dehumidification mode, a refrigeration defrosting mode and a dual refrigeration mode.
In the refrigeration and dehumidification mode, the flow entering the evaporator and the dehumidification heat exchanger is controlled through the first electronic expansion valve and the second electronic expansion valve, the first hot gas electromagnetic valve and the second hot gas electromagnetic valve are closed, and the defrosting stop valve is opened. The opening degree of the first electronic expansion valve is controlled by the superheat degree of the outlet of the evaporator, and the opening degree of the second electronic expansion valve is controlled by the superheat degree of the outlet of the dehumidifying heat exchanger.
In the refrigeration and defrosting mode, the first electronic expansion valve operates, the second electronic expansion valve and the defrosting stop valve are closed, and the first hot gas electromagnetic valve and the second hot gas electromagnetic valve are opened.
In the dual refrigeration mode, the first electronic expansion valve operates, the second electronic expansion valve operates in maximum steps, the first hot gas solenoid valve and the second hot gas solenoid valve are closed, and the defrosting shutoff valve is fully opened.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the frost-free type refrigeration house provided by the utility model, the dehumidification heat exchanger is arranged at the front end of the air inlet of the evaporator, and the problem of frosting of the evaporator is solved from the source by reducing the moisture content of the air entering the evaporator;
2. the utility model has a refrigeration and defrosting mode, can make the unit refrigerate and defrost simultaneously, and reduces the influence of frequent defrosting of the refrigeration house unit on the fluctuation of the temperature in the refrigeration house;
3. the utility model has double refrigeration modes, when the refrigeration device operates in a non-frosting working condition with higher storage temperature, the dehumidification heat exchanger serves as the refrigeration function of the evaporator, and the refrigeration capacity of the unit can be enhanced.
Drawings
The utility model is described in detail below with reference to the following figures and specific examples, wherein:
FIG. 1 is a system diagram of a frost-free refrigerator according to the present invention;
fig. 2 is a flow chart showing an operation mode of the frost-free type refrigerator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.
The utility model provides a frost-free type refrigeration house, which mainly aims at the defects that the refrigeration house evaporator in the industry frosts and needs frequent defrosting, and specifically comprises the following steps: a dehumidification heat exchanger is added at the front end of air inlet of the evaporator, and the moisture content of air entering the evaporator is reduced through temperature reduction and dehumidification; controlling the flow entering the evaporator and the dehumidification heat exchanger through the double electronic expansion valves; direct defrosting is carried out on the dehumidifying heat exchanger through the defrosting loop, the evaporator is kept to refrigerate in the defrosting process, and the influence on the temperature of the refrigeration house during defrosting is reduced.
As shown in fig. 1, the frost-free freezer of the present invention comprises a compressor 1, a condenser 2, a first electronic expansion valve 3, an evaporator 4, and a dehumidifying heat exchanger 5 disposed at the front end of the evaporator 4 and connected in parallel therewith. An outlet pipeline of the first electronic expansion valve 3 is communicated with the evaporator 4 and the dehumidifying heat exchanger 5 through a first branch 6 and a second branch 7 respectively, and a second electronic expansion valve 8 is arranged on the second branch 7. The refrigerant at the outlet of the evaporator 4 and the outlet of the dehumidifying heat exchanger 5 is mixed and then enters the compressor 1 through the suction stop valve 9, the suction filter 18, the four-way reversing valve 10 and the suction pipeline for recirculation.
The frost-free type freezer also comprises a defrosting loop for defrosting the dehumidifying heat exchanger 5, the defrosting loop is composed of a third branch 11 led out from an air inlet pipeline of the condenser 2 to an inlet of the dehumidifying heat exchanger 5 and a fourth branch 12 led out from an outlet pipeline of the condenser 2 to an outlet of the dehumidifying heat exchanger 5, the third branch 11 is provided with a first hot air electromagnetic valve 13, the fourth branch 12 is provided with a second hot air electromagnetic valve 14, and an outlet pipeline of the dehumidifying heat exchanger 5 is provided with a defrosting stop valve 15.
The outlet pipeline of the condenser 2 is sequentially provided with a dry filter 16, a filter 17, a first electronic expansion valve 3, a filter 17 and a liquid supply stop valve 19. The junction of the fourth branch 12 is located between the dry filter 16 and the filter 17. And an air suction stop valve 9 and an air suction filter 18 are sequentially arranged on a mixing pipeline of the outlet of the evaporator 4 and the outlet of the dehumidifying heat exchanger 5.
The working principle of the frost-free type refrigerator provided by the utility model is that the secondary throttling refrigerant liquid exchanges heat with return air with higher moisture content in the dehumidifying heat exchanger 5, so that the air temperature is lower than the dew point temperature, the air humidity at the inlet of the evaporator 4 is reduced, the air entering the evaporator 4 is dry air with lower humidity, and the problem of frosting of the evaporator 4 is solved from the source.
When the frost-free type refrigeration house is started, the refrigerant obtained by the first-stage throttling of the first electronic expansion valve 3 enters the dehumidifying heat exchanger 5 after being throttled again by the second electronic expansion valve 8, and the air with higher moisture content entering the dehumidifying heat exchanger 5 is dehumidified due to the lower temperature of the pipe wall of the dehumidifying heat exchanger 5, so that the air humidity at the outlet of the dehumidifying heat exchanger 5 is reduced. The air with lower humidity from the dehumidifying heat exchanger 5 is introduced into the evaporator 4 again to exchange heat with the refrigerant which is throttled once, so that the possibility of frosting of the evaporator 4 is avoided. The return air is dehumidified in the dehumidifying heat exchanger 5 and cooled in the evaporator 4.
The frost-free type refrigeration house provided by the utility model comprises a refrigeration dehumidification mode, a refrigeration defrosting mode and a dual refrigeration mode.
In the cooling and dehumidifying mode, the flow rates into the evaporator 4 and the dehumidifying heat exchanger 5 are controlled by the first and second electronic expansion valves 3 and 8, the first and second hot gas solenoid valves 13 and 14 are closed, and the frost cut valve 15 is opened. The opening degree of the first electronic expansion valve 3 is controlled by the superheat degree of the outlet of the evaporator 4, and the opening degree of the second electronic expansion valve 8 is controlled by the superheat degree of the outlet of the dehumidifying heat exchanger 5.
In the cooling and defrosting mode, the first electronic expansion valve 3 is normally operated, the second electronic expansion valve 8 and the defrosting stop valve 15 are closed, and the first hot gas solenoid valve 13 and the second hot gas solenoid valve 14 are opened.
In the dual cooling mode, the first electronic expansion valve 3 is normally operated, the second electronic expansion valve 8 is operated in maximum steps, the first and second hot gas solenoid valves 13 and 14 are closed, and the frost cut valve 15 is fully opened.
Fig. 2 is a flow chart of a control method of the frost-free refrigerator provided by the utility model, which comprises the following steps:
the temperature T in the warehouse is monitored in real time, and when the temperature in the warehouse is more than the defrosting set temperature TFrostingWhen the refrigerator runs, the refrigerator enters a double refrigeration mode to run; when the temperature T in the warehouse is less than or equal to the defrosting set temperature TFrostingJudging whether the dehumidification heat exchanger meets defrosting conditions, if so, entering a refrigeration and defrosting mode to operate the refrigeration house; if not, the refrigerator enters a refrigeration and dehumidification mode to operate.
In the refrigeration process, the flow of the refrigerant entering the dehumidification heat exchanger and the evaporator is mainly controlled by two electronic expansion valves, the first electronic expansion valve 3 is mainly controlled by the superheat degree of the outlet of the evaporator 4, and the second electronic expansion valve 8 is controlled by the superheat degree of the outlet of the dehumidification heat exchanger 5. The refrigerant at the outlet of the dehumidifying heat exchanger 5 is mixed with the refrigerant at the outlet of the evaporator 4 and then enters the compressor 1 for recirculation through a suction pipeline.
When the dehumidifying heat exchanger 5 works for a period of time, a frosting phenomenon occurs, and therefore, the dehumidifying heat exchanger 5 needs to be defrosted to ensure subsequent normal operation. In the defrosting process of the dehumidifying heat exchanger 5, the first hot air electromagnetic valve 13 is opened, the second electronic expansion valve 8 and the defrosting stop valve 15 are closed, the second hot air electromagnetic valve 14 is opened after a period of time delay, and high-temperature exhaust is directly introduced into the dehumidifying heat exchanger 5 for defrosting. The delay period serves to ensure that defrost gas can enter through the first hot gas solenoid valve 13, exit through the second hot gas solenoid valve 14, and enter the filter 17. It may occur that the liquid refrigerant coming out of the dry filter 16 enters the dehumidifying heat exchanger 5 if the first hot gas solenoid valve 13 and the second hot gas solenoid valve 14 are simultaneously opened, which affects the dehumidifying heat exchanger defrosting. In the refrigeration and defrosting mode, the refrigerant still flows through the evaporator 4, so that the evaporator 4 can still refrigerate, the influence of the fluctuation of the storage temperature in the defrosting process can be well avoided, and the small fluctuation of the storage temperature in the defrosting process is ensured.
When the cold storage runs under a non-frosting working condition with higher temperature, the second electronic expansion valve 8 directly runs in the maximum steps, and the dehumidification heat exchanger 5 takes the refrigeration effect of the front evaporator, so that the refrigeration capacity of the unit can be enhanced.
The utility model can make the evaporator 4 of the refrigeration house operate in the environment with lower humidity through the continuous dehumidification of the dehumidification heat exchanger 5, and the defrosting of the dehumidification heat exchanger 5 can make the unit refrigerate and defrost at the same time, thereby reducing the influence of defrosting on the temperature fluctuation of the refrigeration house.
The foregoing is considered as illustrative only of the embodiments of the utility model. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the present invention.
Claims (9)
1. The frostless type refrigeration house is characterized by further comprising a dehumidification heat exchanger arranged at the front end of the evaporator and connected with the evaporator in parallel, an outlet pipeline of the first electronic expansion valve is communicated with the evaporator and the dehumidification heat exchanger through a first branch and a second branch respectively, a second electronic expansion valve is arranged on the second branch, and refrigerants at an outlet of the evaporator and an outlet of the dehumidification heat exchanger are mixed and then enter the compressor for recirculation through an air suction pipeline.
2. The frost-free freezer of claim 1, further comprising a condenser and a defrosting loop, wherein the defrosting loop is composed of a third branch led out from the condenser air inlet pipeline to the inlet of the dehumidifying heat exchanger and a fourth branch led out from the condenser outlet pipeline to the outlet of the dehumidifying heat exchanger, the third branch is provided with a first hot air solenoid valve, the fourth branch is provided with a second hot air solenoid valve, and the outlet pipeline of the dehumidifying heat exchanger is provided with a defrosting stop valve.
3. The frost-free freezer of claim 1, wherein said condenser outlet conduit is provided with a dry filter, a first electronic expansion valve, a filter and a liquid supply stop valve in sequence.
4. The frost-free cold storage according to claim 1, wherein a suction stop valve and a suction filter are sequentially provided on the mixing pipe of said evaporator outlet and said dehumidifying heat exchanger outlet.
5. The frost-free freezer of any of claims 1-4, comprising a refrigeration dehumidification mode, a refrigeration defrost mode, and a dual refrigeration mode.
6. The frost-free freezer of claim 5, wherein in the cooling dehumidification mode, flow into the evaporator and the dehumidification heat exchanger is controlled by the first and second electronic expansion valves, the first and second hot gas solenoid valves are closed, and the defrosting shutoff valve is opened.
7. The frost-free type cold storage according to claim 6, wherein an opening degree of the first electronic expansion valve is controlled by a degree of superheat at an outlet of the evaporator, and an opening degree of the second electronic expansion valve is controlled by a degree of superheat at an outlet of the dehumidifying heat exchanger.
8. The frost-free type freezer of claim 5, wherein in the cooling defrost mode, the first electronic expansion valve is operated, the second electronic expansion valve and the defrost check valve are closed, and the first hot gas solenoid valve and the second hot gas solenoid valve are opened.
9. The frost-free type freezer of claim 5, wherein in the dual refrigeration mode, the first electronic expansion valve is operated, the second electronic expansion valve is operated at maximum number of steps, the first hot gas solenoid valve and the second hot gas solenoid valve are closed, and the defrosting shutoff valve is fully opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122178523.3U CN215809420U (en) | 2021-09-09 | 2021-09-09 | Frostless type freezer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122178523.3U CN215809420U (en) | 2021-09-09 | 2021-09-09 | Frostless type freezer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215809420U true CN215809420U (en) | 2022-02-11 |
Family
ID=80158089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122178523.3U Active CN215809420U (en) | 2021-09-09 | 2021-09-09 | Frostless type freezer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215809420U (en) |
-
2021
- 2021-09-09 CN CN202122178523.3U patent/CN215809420U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110332635B (en) | Double-stage compression multi-air-supplementing refrigeration heat pump system, control method and air conditioner | |
| CN103363707B (en) | Heat pump type air conditioner | |
| CN112594871B (en) | Defrosting control method of multifunctional multi-split system with double four-way valves | |
| CN113701375A (en) | Frostless type refrigeration house and control method thereof | |
| CN111238155B (en) | Control and refrigeration method of three-temperature-zone dual-system refrigerator | |
| CN109357431B (en) | Module combined type air conditioning system and defrosting control method | |
| CN210320448U (en) | Double-stage compression multi-air-supply refrigeration heat pump system and air conditioner | |
| CN105091437A (en) | Automatic defrosting system for air cooling refrigerator and control method of automatic defrosting system | |
| CN112594985B (en) | Oil return control method of multifunctional multi-split system with double four-way valves | |
| CN108168139B (en) | Air-supplementing type heat pump air conditioning system of electric automobile | |
| CN214469435U (en) | Multi-split air conditioner system with refrigerant recovery function | |
| CN111442558B (en) | Temperature and humidity separately-controlled air conditioning system based on different evaporation temperatures of single machine and control method | |
| CN215809420U (en) | Frostless type freezer | |
| CN112665226A (en) | Air conditioning system and control method thereof | |
| CN111121352A (en) | Continuous defrosting refrigeration control system capable of reducing heat leakage | |
| CN113587510B (en) | Evaporator defrost control method for cooling system, computer readable storage medium | |
| CN214536955U (en) | Constant-temperature refrigeration house system with hot fluorine automatic defrosting function | |
| CN115060022A (en) | High-low temperature experiment box system and control method thereof | |
| CN204880911U (en) | White system of automation of forced air cooling refrigerator | |
| CN211424782U (en) | Hot fluorine defrosting device and air conditioning unit | |
| CN212081578U (en) | Energy-saving air conditioner circulating system with automatic defrosting function | |
| CN110986440B (en) | Thermal fluorine defrosting device, air conditioning unit and defrosting control method | |
| CN113776142A (en) | Heat pump type air conditioner refrigeration cycle system and control method thereof | |
| CN112880228A (en) | Air conditioner liquid return prevention device and method for preventing air conditioner liquid return | |
| CN111578450A (en) | Air conditioning system and defrosting method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |