CN216159372U

CN216159372U - Refrigerator car refrigerating unit with fan started after delay

Info

Publication number: CN216159372U
Application number: CN202122281442.6U
Authority: CN
Inventors: 袁荣轶; 张儒铭; 冯仁君; 郭怀远
Original assignee: Zhengzhou Kaixue Transport Refrigeration Equipment Co ltd
Current assignee: Zhengzhou Kaixue Transport Refrigeration Equipment Co ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-04-01
Anticipated expiration: 2031-09-22

Abstract

The utility model provides a refrigerator car refrigerating unit with a fan started after delay, which comprises a refrigerator control system, an evaporator, a condenser, a compressor, an evaporation fan and a condensation fan, wherein a storage temperature sensor is arranged on the evaporator; the outlet end of the evaporator is provided with a low-pressure air return pipeline, and the low-pressure air return pipeline is provided with a defrosting temperature sensor, a buffer pipe, a suction pressure regulating valve and a low-pressure sensor; the compressor is connected with a compressor exhaust pipeline, the compressor exhaust pipeline is connected with an oil separator, and the lower end of the oil separator is respectively communicated with the evaporator directly through a defrosting pipeline and is communicated with the condenser through a liquid supply electromagnetic valve; the outlet end of the condenser is connected with the buffer tube through a condenser pipeline, the buffer tube is communicated with the inlet end of the evaporator through a connecting branch pipe, and an electronic expansion valve is arranged on the connecting branch pipe. The refrigerator car refrigerating unit can effectively avoid temperature fluctuation in the refrigerator after the defrosting condition of the unit is finished.

Description

Refrigerator car refrigerating unit with fan started after delay

Technical Field

The utility model relates to the field of refrigerated trucks, in particular to a refrigerated truck refrigerating unit with a delayed fan starting function.

Background

The refrigerator car is a closed van-type transport vehicle for transporting frozen or fresh-keeping goods, is a special transport vehicle provided with a refrigerating unit, and is commonly used for transporting frozen foods, dairy products, vegetables, fruits, vaccines, medicines and the like. Because the temperature is maintained below 0 ℃ when goods are transported, the evaporation fan works under frosting when the surface temperature is lower than 0 ℃, and flaky and irregular frost is formed along with the increase of frosting time, so that the heat transfer performance of the evaporation fan is reduced, and the efficiency of a refrigeration system is reduced. Therefore, timely defrosting is particularly important for energy-saving operation of the refrigeration system.

In general, when the defrosting of the refrigerant defrosting system is finished, the temperature of the fins can reach 15 ℃, and if the evaporation fan is started, the air in the tank is forcibly cooled, and meanwhile, the surplus heat generated during the defrosting of the evaporator is introduced into the tank, so that the temperature of the storage is increased.

In order to solve the above problems, people are always seeking an ideal technical solution.

SUMMERY OF THE UTILITY MODEL

In order to achieve the purpose, the utility model adopts the technical scheme that: a refrigerator car refrigerating unit with a fan started after delay comprises a refrigerating unit and a refrigerator control system for controlling the starting and stopping of the refrigerating unit, wherein the refrigerating unit comprises an evaporator, a condenser, a compressor, an evaporation fan and a condensation fan, and a storage temperature sensor is arranged at an air return port of the evaporator;

the outlet end of the evaporator is provided with a low-pressure air return pipeline communicated with the air return end of the compressor, and the low-pressure air return pipeline is provided with a defrosting temperature sensor, a buffer pipe, a suction pressure regulating valve and a low-pressure sensor;

the inlet end of the evaporator is provided with a defrosting pipeline and a connecting branch pipe used for connecting the buffer pipe for communication, an electronic expansion valve is arranged on the connecting branch pipe, and a refrigerant recovery pipe is connected between the electronic expansion valve and the low-pressure return gas pipeline;

the air exhaust end of the compressor is connected with a compressor air exhaust pipeline, the compressor air exhaust pipeline is connected with an oil separator, the lower end of the oil separator is provided with two outlets, one outlet is communicated with the defrosting pipeline, and the other outlet is communicated with the inlet end of the condenser through a liquid supply electromagnetic valve;

a condenser pipeline communicated with the buffer tube is arranged at the outlet end of the condenser;

and the storage temperature sensor, the defrosting temperature sensor and the low-pressure sensor are respectively in communication connection with the cold machine control system.

Based on the above, the cold machine control system is respectively connected with the electronic expansion valve, the defrosting electromagnetic valve, the liquid supply electromagnetic valve and the compressor in a control mode.

Based on the above, the refrigerator control system is an 80C51 series single chip microcomputer.

Compared with the prior art, the refrigerating unit of the refrigerator car has substantive characteristics and progress, and particularly, the refrigerating unit of the refrigerator car with the fan started in a delayed mode is simple in structure and good in using effect. Through set defrosting operating mode end back evaporation fan postpone start-up, set up the time of dripping, can be so that a large amount of moisture that exist in the evaporator core drops from the evaporimeter, again through in the drainage pipe says and flows out the car. Thereby effectively avoiding the phenomenon that the residual moisture is blown out of the core body by the evaporation fan and attached to the surface of the goods to be frosted again.

Furthermore, the evaporation fan is started after being delayed, so that the heat exchange between the evaporation core fins and air in the box, which occurs due to the fact that the temperature of the evaporation core fins is high, can be effectively avoided after the defrosting working condition of the unit is finished, and the temperature fluctuation in the box is avoided.

Furthermore, the refrigerant recovery pipe is arranged on the electronic expansion valve, so that the refrigerant in the low-pressure return gas pipeline can be effectively evacuated after the refrigerating unit is stopped, and the liquid compression condition of the compressor when the refrigerating unit is restarted is reduced.

Furthermore, the suction pressure regulating valve is arranged on the low-pressure air return pipeline, so that the pressure of the refrigerant in the evaporator can be controlled, the time that the refrigerant stays in the evaporator pipeline is increased, the heat can be better absorbed from the air in the delayed starting stage of the air cooler, and the refrigerating effect is improved.

Drawings

Fig. 1 is a schematic view of the connection relationship of a refrigerator unit of a refrigerator car with a fan started later according to the present invention.

Fig. 2 is a schematic diagram of a refrigerator car refrigeration unit defrost mode with delayed fan activation according to the present invention.

Fig. 3 is a schematic diagram of a control logic for a chiller unit for a refrigerated vehicle with delayed fan start provided by the present invention.

In the figure: 1. a compressor; 2. a compressor discharge line; 3. a low pressure return gas line; 4. a defrosting solenoid valve; 5. a defrosting pipeline; 6. an oil separator; 7. a liquid supply solenoid valve; 8. a condenser; 9. a low pressure sensor; 10. an inspiratory pressure regulator valve; 11. a reservoir; 12. drying the bottle; 13. a condenser line; 14. a defrost temperature sensor; 15. an evaporator; 16. a reservoir temperature sensor; 17. an electronic expansion valve; 18. connecting branch pipes; 19. a refrigerant recovery pipe; 20. a buffer tube; 21. a condensing fan; 22. an evaporation fan.

Detailed Description

The technical solution of the present invention is further described in detail by the following embodiments.

Example 1

The embodiment provides a refrigerator car refrigerating unit with a fan started after being delayed, as shown in fig. 1, fig. 2 and fig. 3, the refrigerator car refrigerating unit includes a refrigerating unit and a refrigerator control system for controlling the starting and stopping of the refrigerating unit, and the refrigerating unit includes an evaporator 15, a condenser 8, a compressor 1, an evaporation fan 22 and a condensation fan 21.

And a storage temperature sensor 16 is arranged at the air return inlet of the evaporator 8.

And the outlet end of the evaporator 8 is provided with a low-pressure return gas pipeline 3 communicated with the gas return end of the compressor 1. The low-pressure return air pipeline 3 is provided with a defrosting temperature sensor 14, a buffer pipe 20, a suction pressure regulating valve 10 and a low-pressure sensor 9.

The exhaust end of the compressor 1 is connected with a compressor exhaust pipeline 2, and the compressor exhaust pipeline 2 is connected with an oil separator 6.

The lower end of the oil separator 6 is provided with two paths of outlets, one path of outlet is directly communicated with the evaporator 15 through a defrosting pipeline 5, and the other path of outlet is communicated with the condenser 8 through a liquid supply electromagnetic valve 7.

The outlet end of condenser 8 is connected to buffer tube 20 by condenser line 13. The condenser pipeline 13 is provided with a liquid storage device 11 and a drying bottle 12.

One end of buffer tube 20 is connected to the inlet end of evaporator 15 via a connecting branch tube 18, and an electronic expansion valve 17 is disposed on connecting branch tube 18. A refrigerant recovery pipe 19 is connected between the electronic expansion valve 17 and the low-pressure return gas pipe 3.

And the storage temperature sensor 16, the defrosting temperature sensor 14 and the low-pressure sensor 9 are respectively in communication connection with the refrigerator control system.

And the cold machine control system is respectively connected with the electronic expansion valve 17, the defrosting electromagnetic valve 4, the liquid supply electromagnetic valve 7 and the compressor 1 in a control mode. In this embodiment, the chiller control system is an 80C51 series single chip microcomputer. An evaporation fan is arranged on the evaporator, and a condensation fan is arranged on the condenser.

Specifically, the refrigerator car refrigerating unit that the fan postpones the start that this embodiment provided specifically work flow as follows:

when the unit carries out defrosting working condition, the compressor normally works, the defrosting electromagnetic valve is opened, the liquid supply electromagnetic valve is closed, and the condensing fan and the evaporating fan are all closed, and at the moment, high-temperature and high-pressure refrigerant directly enters the evaporator through the pipeline to be condensed and radiated to melt frost on the surface of the evaporating core body. After defrosting, the refrigeration coming out of the evaporator returns to the compressor through the suction pressure regulating valve, and the unit finishes defrosting operation and enters a refrigeration waiting state.

And in the refrigeration waiting state stage, the refrigerating unit does not work, enters a water dripping mode, and flows the water after the frost is melted out of the vehicle through a drainage pipeline.

After the water dripping is finished, the refrigerating unit is started again according to the set temperature, at the moment, the compressor is started, the liquid supply valve is opened, the condensing fan is opened, the defrosting electromagnetic valve is closed, and the evaporating fan is not started. At the moment, the high-temperature and high-pressure refrigerant is radiated by the condensation core body and then enters the evaporation core body through the drying bottle and the expansion valve to be cooled so as to achieve the aim of refrigeration.

In the refrigeration stage, the evaporation core body can be cooled faster than indoor air because the evaporation fan is not started, so that the temperature of the evaporation core body fins is reduced more quickly. And when the temperature difference between the defrosting temperature sensor and the storage temperature sensor reaches a set value after the temperature of the defrosting temperature sensor is compared with the temperature of the storage temperature sensor, the evaporation fan is started again, and the unit enters a normal refrigeration mode.

Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the utility model or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the utility model as defined by the appended claims.

Claims

1. The utility model provides a refrigerator car refrigerating unit that fan postpones start-up, includes refrigerating unit and is used for controlling the cold quick-witted control system that refrigerating unit opened and stops, refrigerating unit includes evaporimeter, condenser, compressor, evaporation fan and condensation fan, the return air inlet department of evaporimeter is provided with storehouse temperature sensor, its characterized in that:

and the outlet end of the condenser is provided with a condenser pipeline communicated with the buffer tube.

2. A refrigerator car chiller unit with fan delayed start as claimed in claim 1 wherein: and the cold machine control system is used for controlling the start and stop of the electronic expansion valve, the defrosting electromagnetic valve, the liquid supply electromagnetic valve and the compressor.

3. A refrigerator car chiller unit with fan delayed start as claimed in claim 1 or 2 wherein: the cold machine control system is an 80C51 series single chip microcomputer.

4. A refrigerator car chiller unit with fan delayed start as claimed in claim 3 wherein: and a liquid storage device and a drying bottle are arranged on the condenser pipeline.