CN214536942U - Experimental condensing pressure adjusting device for commercial refrigerator - Google Patents

Abstract

The utility model provides a condensation pressure adjusting device for commercial refrigerator experiment, which comprises an evaporator, a condenser, a compressor and a liquid storage tank; the compressor is communicated with the condenser through a second pipeline; a condensation pressure regulating valve is arranged on the second pipeline; the condenser is communicated with the liquid storage tank through a third pipeline; the compressor is communicated with the liquid storage tank through a branch pipeline, and a bypass valve is arranged on the branch pipeline; the compressor is communicated with the evaporator through a first pipeline, and a temperature sensing bulb is arranged on the first pipeline; the liquid storage tank is communicated with the evaporator through a fourth pipeline; and an expansion valve and a drying bottle are arranged on the fourth pipeline. The device has kept condensing pressure's stability through the continuous regulation of condensing pressure governing valve, lets refrigerating system high-efficient start and steady operation under low temperature environment.

Description

Experimental condensing pressure adjusting device for commercial refrigerator

Technical Field

The utility model relates to a commercial freezer field, specific theory has related to a commercial freezer experiment condensation pressure adjusting device.

Background

At present, commercial refrigerator laboratories generally encounter the problem that compressors cannot be well started due to low return air pressure when testing remote refrigerators in winter, and the accuracy of experimental data is greatly reduced. The common solution is to use a frequency converter set to realize that the compressor and the condensing fan can be automatically adjusted according to the pressure. And setting the condensation pressure to a certain range, for example, setting the condensation pressure to be 14 bar to 18bar, stopping the fan when the condensation pressure is low when the machine is started, so that the condensation pressure begins to rise, starting the fan when the pressure rises to 18bar, and normally radiating the heat of the condenser to realize the normal operation of the unit.

However, the above-described means generally have the following problems. When the frequency conversion unit is adopted, the compressor and the condensing fan are automatically adjusted according to the pressure, the method has high cost and is not economical for a small refrigeration system. The method for setting the condensing pressure can be started stably to a certain extent, but the fan is started and stopped all the time, the fan can be damaged seriously, and in some extremely low-temperature days, the outdoor temperature can reach minus 15 ℃ to minus 18 ℃, and even if the condensing fan is not started, the condensing pressure is low. And the regulating valve is connected to the outlet position of the condenser, so that the amount of added refrigerant is large and the cost is high.

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

SUMMERY OF THE UTILITY MODEL

In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a commercial refrigerator experiment condensation pressure adjusting device comprises an evaporator, a condenser, a compressor and a liquid storage tank;

the compressor is communicated with the condenser through a second pipeline; a condensation pressure regulating valve is arranged on the second pipeline; the condenser is communicated with the liquid storage tank through a third pipeline; the compressor is communicated with the liquid storage tank through a branch pipeline, and a bypass valve is arranged on the branch pipeline;

the compressor is communicated with the evaporator through a first pipeline, and a temperature sensing bulb is arranged on the first pipeline; the liquid storage tank is communicated with the evaporator through a fourth pipeline; and an expansion valve and a drying bottle are arranged on the fourth pipeline.

Based on the above, the condensation pressure regulating valve comprises a regulating valve body, and a protective end cover, a pressure regulating nut, a main spring and a balance corrugated pipe are sequentially arranged on the upper part of the regulating valve body from top to bottom; the bottom of the balance corrugated pipe is provided with a valve seat, and two ends of the main spring are respectively arranged on the pressure adjusting nut and the balance corrugated pipe;

an outlet connecting pipe is arranged in the middle of the regulating valve body, a valve disc is arranged at the lower part of the regulating valve body, and a valve plate, a secondary spring and a damping block are sequentially arranged at the lower part of the valve seat from top to bottom; the valve plate is arranged above the valve disc and can be in sealing fit with the valve disc; the secondary spring and the damping block are sleeved on the lower portion of the valve seat in a sliding mode, a baffle with a hole is arranged at the bottom of the valve disc, and the damping block is arranged above the baffle.

Based on the above, the lower part of governing valve body is provided with the manometer interface, be provided with the manometer on the manometer interface.

The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model provides a commercial freezer experiment condensation pressure adjusting device through the continuous regulation of condensation pressure governing valve, has kept condensation pressure's stability, lets refrigerating system high-efficient start-up and steady operation, simple structure under low temperature environment.

Drawings

Fig. 1 is a schematic view of the connection relationship of the experimental condensing pressure regulator of the commercial refrigerator.

Fig. 2 is the utility model provides a condensation pressure regulating valve internal structure schematic diagram among the commercial freezer experiment condensation pressure adjusting device.

In the figure: 1. a compressor; 2. a condenser; 3. a bypass valve; 4. a condensing pressure regulating valve; 5. a liquid storage tank; 6. an expansion valve; 7. an evaporator; 8. a temperature sensing bulb; 9. Drying the bottle; 10. a secondary spring; 11. an outlet connection pipe; 12. a valve seat; 13. a valve body of the regulating valve; 14. a pressure gauge interface; 15. protecting the end cover; 16. a pressure adjusting nut; 17. a main spring; 18. a balance bellows; 19. a valve disc; 20. a valve plate; 21. a damping block; 22. a first pipeline; 23. a second pipeline; 24. a third pipeline; 25. a fourth pipeline; 26. and (4) branch pipelines.

Detailed Description

The technical solution of the present invention will be described in further detail through the following embodiments.

Example 1

The embodiment provides a commercial freezer experiment condensation pressure adjusting device, as shown in fig. 1 and fig. 2, comprising an evaporator 7, a condenser 2, a compressor 1 and a liquid storage tank 5.

The compressor 1 is communicated with the condenser 2 through a second pipeline 23. The second pipeline 23 is provided with a condensation pressure regulating valve 4. The condenser 2 is communicated with the liquid storage tank 5 through a third pipeline 24. The compressor 1 is communicated with the liquid storage tank 5 through a branch pipeline 26, and the branch pipeline 26 is provided with a bypass valve 3.

The compressor 1 is communicated with the evaporator 7 through a first pipeline 22, and a temperature sensing bulb 8 is arranged on the first pipeline 22. The liquid storage tank 5 is communicated with the evaporator 7 through a fourth pipeline 25; an expansion valve 6 and a drying bottle 9 are arranged on the fourth pipeline 25.

Specifically, the condensation pressure regulating valve 4 comprises a regulating valve body 13, and a protective end cover 15, a pressure regulating nut 16, a main spring 17 and a balance corrugated pipe 18 are sequentially arranged on the upper part of the regulating valve body 13 from top to bottom. The bottom of the balance bellows 18 is provided with a valve seat 12, and both ends of the main spring 17 are respectively disposed on the pressure adjusting nut 16 and the balance bellows 18.

An outlet connecting pipe 11 is arranged in the middle of the regulating valve body 13, a valve disc 19 is arranged on the lower portion of the regulating valve body 13, and a valve plate 20, a secondary spring 10 and a damping block 21 are sequentially arranged on the lower portion of the valve seat 12 from top to bottom. Valve plate 20 is disposed above valve disc 19 and is capable of sealing engagement with valve disc 19. The secondary spring 10 and the damping block 21 are sleeved on the lower part of the valve seat 12 in a sliding manner. The bottom of the valve disc 19 is provided with a baffle with holes, and the damping block 21 is arranged above the baffle.

The lower part of the regulating valve body 13 is provided with a pressure gauge interface 14, and a pressure gauge is arranged on the pressure gauge interface 14.

Specifically, this commercial freezer experiment condensation pressure adjusting device working process as follows:

firstly, the bypass valve has a factory set value range, the initial value is generally 1.4bar, and the bypass valve is completely opened to 3 bar. When the pressure reaches a set value, the valve sheet in the valve body is opened, and the opening degree of the valve sheet is increased along with the increase of the pressure until the maximum value is reached. The condensing pressure regulating valve is connected to the exhaust pipeline of the compressor and the inlet of the condenser for regulation. The inlet of the bypass valve is also connected with the exhaust pipeline, the outlet of the bypass valve is connected with the liquid storage device, and the bypass valve and the liquid storage device are connected in a welding mode.

When the compressor is started, the pressure of the exhaust pipeline begins to rise, the initial set pressure of the bypass valve is quickly reached to 1.4bar, and the bypass valve is opened. At the moment, the pressure of the condensing pressure regulating valve does not reach the set value, the condensing pressure regulating valve is in a closed state, the bypass valve directly leads high-temperature and high-pressure gas into the liquid storage tank and continues to push forwards, the return gas pressure begins to rise, and the phenomenon that the suction pressure of the compressor is too low to alarm is avoided.

When the pressure of the exhaust pipe reaches the set value of the condensing pressure regulating valve, the high-pressure steam backs up the valve core and is led into the condenser, and the normal circulation of the refrigerating system is started.

When the condensing pressure of the condenser is reduced due to the reduction of the ambient temperature, the valve core is closed by the spring force in the condensing pressure regulating valve, the flow of the valve core is reduced, and the condensing pressure is maintained at a set value. When the condensing pressure is higher than the set value, the spring force is smaller than the condensing pressure, and the valve core is jacked to be large so as to keep the original pressure.

This commercial freezer experiment condensation pressure adjusting device passes through the continuous regulation of condensation pressure regulator promptly, has kept condensation pressure's stability, lets refrigerating system high-efficient start-up and steady operation under low temperature environment.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims (3)

1. The utility model provides a commercial freezer experiment condensation pressure adjusting device which characterized in that: comprises an evaporator, a condenser, a compressor and a liquid storage tank;

the compressor is communicated with the condenser through a second pipeline; a condensation pressure regulating valve is arranged on the second pipeline; the condenser is communicated with the liquid storage tank through a third pipeline; the compressor is communicated with the liquid storage tank through a branch pipeline, and a bypass valve is arranged on the branch pipeline;

the compressor is communicated with the evaporator through a first pipeline, and a temperature sensing bulb is arranged on the first pipeline; the liquid storage tank is communicated with the evaporator through a fourth pipeline; and an expansion valve and a drying bottle are arranged on the fourth pipeline.

2. The experimental condensing pressure regulator of commercial freezer as claimed in claim 1, wherein: the condensation pressure regulating valve comprises a regulating valve body, and a protective end cover, a pressure regulating nut, a main spring and a balance corrugated pipe are sequentially arranged on the upper part of the regulating valve body from top to bottom; the bottom of the balance corrugated pipe is provided with a valve seat, and two ends of the main spring are respectively arranged on the pressure adjusting nut and the balance corrugated pipe;

an outlet connecting pipe is arranged in the middle of the regulating valve body, a valve disc is arranged at the lower part of the regulating valve body, and a valve plate, a secondary spring and a damping block are sequentially arranged at the lower part of the valve seat from top to bottom; the valve plate is arranged above the valve disc and can be in sealing fit with the valve disc; the secondary spring and the damping block are sleeved on the lower portion of the valve seat in a sliding mode, a baffle with a hole is arranged at the bottom of the valve disc, and the damping block is arranged above the baffle.

3. The experimental condensing pressure regulator of commercial freezer of claim 2, characterized in that: the lower part of the regulating valve body is provided with a pressure gauge interface, and a pressure gauge is arranged on the pressure gauge interface.

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