CN214200675U - Enthalpy difference testing device - Google Patents

Abstract

The application discloses an enthalpy difference testing device, which comprises an outdoor unit testing room for providing a side testing environment for an air conditioner outdoor unit and a refrigerating mechanism for adjusting the temperature of the outdoor unit testing room; refrigerating mechanism includes compressor, condenser, first throttling assembly, second throttling assembly and evaporating coil, and the compressor is connected in the condenser, and the output of condenser is connected with parallelly connected first return circuit and second return circuit, and first return circuit and second return circuit converge the back and connect in the input of compressor, and first throttling assembly and evaporating coil establish ties and locate on the first return circuit, and second throttling assembly locates on the second return circuit. According to the compressor, when the compressor is in high-pressure ratio operation for a long time and the exhaust temperature exceeds the preset value, the second throttling assembly is opened, so that the refrigerant flowing through the second loop and the refrigerant flowing through the first loop converge and then flow into the compressor, the exhaust temperature of the compressor is reduced, the condition that the compressor generates exhaust over-temperature is avoided, and the reliability of long-term operation of the compressor is further ensured.

Description

Enthalpy difference testing device

Technical Field

The application relates to the technical field of air conditioner performance testing, in particular to an enthalpy difference testing device.

Background

The enthalpy difference laboratory is a common laboratory for testing the performance of the air conditioner, the enthalpy difference testing device is a device for manually simulating the working environment of one or more tested products in the laboratory, and when the performance of the air conditioner is tested, the enthalpy difference testing device can provide required working conditions (such as ambient temperature, ambient humidity and the like) for the tested air conditioner so as to more accurately detect the performance of the air conditioner.

However, in the prior art, when an enthalpy difference laboratory simulates a low-temperature working condition, the enthalpy difference laboratory is generally realized by adopting a mode of combining a plurality of sets of screw compressors and a refrigerating machine, or a mode of combining a two-stage piston compressor and a refrigerating machine, so that the compressors can continuously run under the condition of high pressure ratio, and meanwhile, part of the screw compressors are provided with liquid spraying interfaces, and the compressors can be cooled by directly spraying refrigerant liquid to the compressors.

When the air conditioner is tested under the condition of simulating the low-temperature environment, the enthalpy difference testing device needs to provide continuous low-temperature working conditions for a laboratory for a long time, so that the compressor needs to operate under the condition of high pressure ratio for a long time, the exhaust temperature of the device is higher at the moment, and the exhaust overtemperature is easily caused by long-time operation, so that the compressor is failed or damaged.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems of the prior art, the main object of the present application is to provide an enthalpy difference testing apparatus capable of preventing the exhaust temperature from being too high due to the long-term operation of the compressor under the condition of high pressure ratio.

In order to achieve the above purpose, the following technical solutions are specifically adopted in the present application:

the application provides an enthalpy difference testing device, this enthalpy difference testing device includes:

the air conditioner external unit testing room is used for placing an air conditioner external unit and providing a testing environment for the air conditioner external unit;

the refrigerating mechanism is used for adjusting the temperature of the outdoor unit test room so that the temperature of the outdoor unit test room meets the test temperature requirement of the air-conditioning outdoor unit;

wherein, refrigerating mechanism includes compressor, condenser, first throttle subassembly, second throttle subassembly and evaporating coil, the compressor with the condenser passes through the tube coupling, the output of condenser is connected with parallelly connected first return circuit and second return circuit, first return circuit with the second return circuit converge after with the input of compressor is connected, first throttle subassembly with evaporating coil establishes ties and locates on the first return circuit, second throttle subassembly is located on the second return circuit.

In a specific embodiment, the second throttling assembly includes a first valve and a first expansion valve connected in series and disposed in the second circuit, wherein the first expansion valve is located between the first valve and the compressor.

In a specific embodiment, the first expansion valve is an inner balance thermal expansion valve, and a first bulb is connected to the first expansion valve, the first bulb is disposed at an output end of the compressor, and the first bulb is configured to control an opening degree of the first expansion valve according to a detected temperature of refrigerant at the output end of the compressor.

In a specific embodiment, the refrigeration mechanism further comprises a gas-liquid separator, the first loop and the second loop are converged and then connected with an input end of the gas-liquid separator, and an output end of the gas-liquid separator is connected with an input end of the compressor.

In a specific embodiment, the refrigeration mechanism further includes an oil separator disposed at an output of the compressor, wherein an input of the oil separator is connected to an output of the compressor, a first output of the oil separator is connected to an input of the condenser, and a second output of the oil separator is connected to an input of the compressor.

In a particular embodiment, the first throttling assembly includes a second expansion valve disposed in the first circuit between the condenser and the evaporator coil.

In a specific embodiment, the second expansion valve is an inner balance thermal expansion valve, and a second thermal bulb is connected to the second expansion valve, the second thermal bulb is disposed at the output end of the evaporation coil, and the second thermal bulb is configured to control the opening degree of the second expansion valve according to the detected temperature of the refrigerant at the output end of the evaporation coil.

In a specific embodiment, the refrigeration mechanism further includes a second valve disposed in the first circuit and in series with the second expansion valve.

In a specific embodiment, the refrigeration mechanism further includes a dry filter disposed at an output of the condenser, and the first loop and the second loop are both connected to an output of the dry filter.

In a specific implementation manner, the enthalpy difference testing device further comprises an equipment room communicated with the outdoor unit testing room, a fan is arranged in the equipment room, and the evaporation coil is arranged in the equipment room and located between the fan and the outdoor unit testing room.

Compared with the prior art, the enthalpy difference testing device is characterized in that the output end of the condenser is connected with the first loop and the second loop which are connected in parallel, the first loop and the second loop are converged and then connected with the input end of the compressor, the first throttling component and the evaporation coil are connected in series on the first loop, and the second throttling component is arranged on the second loop; when the compressor is in high-pressure ratio operation for a long time and the exhaust temperature exceeds the preset value, the second throttling assembly is opened, so that the refrigerant flowing through the second loop and the refrigerant flowing through the first loop converge and then flow into the compressor, the exhaust temperature of the compressor is reduced, the condition that the compressor generates exhaust over-temperature is avoided, and the reliability of long-term operation of the compressor is further ensured.

Drawings

Figure 1 is the enthalpy difference test device that is used for detecting air conditioner performance that this application implementation provided.

The attached drawings are as follows:

1. an external machine test room; 11. a first pair of doors; 2. a refrigeration mechanism; 21. a first circuit; 22. a second loop; 23. a compressor; 24. a condenser; 25. an evaporating coil; 26. drying the filter; 27. a gas-liquid separator; 28. an oil separator; 201. a first valve; 202. a first expansion valve; 203. a first bulb; 204. a second valve; 205. a second expansion valve; 206. a second bulb; 207. a ball valve; 3. a device room; 31. maintaining the door; 4. a fan; 5. an electric heating module; 6. an internal machine test room; 61. a second opposite opening door; 7. an air treatment cabinet; 8. an air volume measuring component; 9. a translation door.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it should be understood that the terms "upper" and "lower" used in the description of the embodiments of the present application are used in a descriptive sense only and not for purposes of limitation. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

Referring to fig. 1, fig. 1 is a view illustrating an enthalpy difference testing apparatus according to an embodiment of the present application. This enthalpy difference test device includes outer machine test room 1 and refrigeration mechanism 2, and outer machine test room 1 is used for placing the outer machine of air conditioner for the outer machine of air conditioner provides test environment, and it has first to open door 11, can open or close outer machine test room 1 through first to opening door 11 to conveniently place the outer machine of air conditioner. The refrigerating mechanism 2 is used for adjusting the air temperature in the outer machine test room 1, so that the air temperature in the outer machine test room 1 meets the test temperature requirement of the air conditioner outer machine. Wherein, the refrigeration mechanism is provided with a plurality of sets to satisfy the test requirements of units with different temperature and cold ranges.

Specifically, the enthalpy difference testing device further comprises an equipment room 3 and a fan 4, wherein the equipment room 3 is communicated with the outdoor unit testing room 1 and used for storing some components capable of adjusting the air temperature, and the enthalpy difference testing device is provided with a maintenance door 31, and the equipment room 3 can be opened or closed through the maintenance door 31 so as to be convenient for maintaining the components stored in the equipment room 3. The fan 4 is arranged in the equipment room 3 and used for blowing the adjusted air into the outdoor unit testing room 1 to achieve the purpose of adjusting the air temperature of the outdoor unit testing room 1, and further meet the requirements of different temperature and cold quantity ranges for testing the outdoor unit (unit) of the air conditioner.

The refrigeration mechanism 2 includes a first circuit 21, a second circuit 22, a compressor 23, a condenser 24, an evaporator coil 25, a first throttling assembly and a second throttling assembly. The output end of the compressor 23 is connected to the input end of the condenser 24 through a pipeline, the first loop 21 and the second loop 22 are connected in parallel, one end of the first loop 21 and one end of the second loop 22 are connected to the output end of the condenser 24, and the other ends of the first loop 21 and the second loop 22 are converged and then connected to the input end of the compressor 23. The first throttling assembly and the evaporating coil 25 are connected in series and arranged on the first loop 21, the evaporating coil 25 is further arranged in the equipment room 3 and located between the fan 4 and the outer machine testing room 1, and the second throttling assembly is arranged on the second loop 22. The first circuit 21 and the second circuit 22 have refrigerants therein, and the refrigerant flows from the output end of the evaporation coil 25 to the input end of the evaporation coil 25. The condenser 24 is a shell and tube condenser and the compressor 23 is a semi-hermetic piston compressor or other compressor that does not allow liquid compression.

When the refrigeration device is used for refrigeration, low-pressure gas flowing out of the evaporation coil 25 is lifted into high-pressure gas under the action of the compressor 23 and flows to the condenser 24, and the high-pressure gas releases heat and is converted into low-temperature liquid under the action of the condenser 24; the low-temperature liquid flows into the evaporation coil 25 from the input end of the evaporation coil 25 after being throttled and depressurized by the first throttling component. The fan 4 introduces hot air to flow through the evaporation coil 25, so that the hot air and the refrigerant in the evaporation coil 25 are subjected to heat exchange to be changed into cold air, the cooled cold air is blown into the external unit test room 1 through the fan 4 to achieve the purpose of adjusting the air temperature in the external unit test room 1, and at the moment, the low-pressure low-temperature liquid in the evaporation coil 25 absorbs the heat in the surrounding hot air and turns into gas to flow out from the output end of the evaporation coil 25.

The second loop 22 is connected to the output end of the condenser 24 and the input end of the compressor 23, and the second throttling component is arranged on the second loop 22. When the compressor 23 is in high-pressure ratio operation for a long time and the exhaust temperature exceeds the preset value, the second throttling component is opened, so that the refrigerant flowing through the second loop 22 and the refrigerant flowing through the first loop 21 converge and then flow into the compressor 23, the exhaust temperature of the compressor 23 is reduced, the problem that the exhaust temperature of the compressor is too high due to long-time low-temperature working condition operation of the refrigeration mechanism 2 is avoided, the problem of system protection or damage of equipment is prevented, and the reliability of long-time operation of the equipment is ensured.

In the prior art, if the refrigeration mechanism generates shutdown protection due to overhigh exhaust temperature of the compressor, the environmental temperature is changed, and at the moment, corresponding test items need to be carried out again, so that much time is wasted and energy is not saved. The compressor exhaust temperature can be avoided being too high, the reliability of long-term operation of equipment is guaranteed, the problem that shutdown protection is generated by the equipment is further prevented, and the production efficiency is improved.

Continuing to refer to fig. 1, the second throttling assembly includes a first valve 201, a first expansion valve 202, and a first bulb 203. The first valve 201 and the first expansion valve 202 are connected in series and disposed in the second circuit 22, and preferably, the first expansion valve 202 is located between the compressors 23 of the first valve 201, however, the positions of the first valve 201 and the first expansion valve 202 may be reversed, and are not limited herein. The first bulb 203 is disposed at an output end of the compressor 23, connected to the first expansion valve 202, and configured to control an opening degree of the first expansion valve 202 according to a detected refrigerant temperature at the output end of the compressor 23. Wherein the first expansion valve 202 is an inner balance thermal expansion valve.

In the present embodiment, the opening or closing of the second circuit 22 is controlled by the first valve 201, and the opening degree of the second circuit 22 is controlled by the first expansion valve 202 and the first bulb 203. Under normal conditions, the first valve 201 is in a closed state, and when the compressor 23 is in a high-pressure ratio operation for a long time and the discharge temperature exceeds a preset value, the first valve 201 is opened, so that part of the refrigerant flowing out of the condenser 24 flows through the second circuit 22, merges with the refrigerant flowing through the first circuit 21 and enters the compressor 23. The first bulb 203 is used for detecting the temperature of the refrigerant at the output end of the compressor 23, and the first expansion valve 202 is used for adjusting the opening degree thereof according to the temperature detected by the first bulb 203 so as to adjust the flow rate of the refrigerant flowing through the second circuit 22. Specifically, the higher the temperature detected by the first bulb 203, the larger the opening degree of the first expansion valve 202, and the larger the flow rate of the refrigerant flowing through the second circuit 22.

Further, the refrigeration mechanism 2 further includes a dry filter 26, a gas-liquid separator 27, and an oil separator 28. The dry filter 26 is provided at an output end of the condenser 24, and the first loop 21 and the second loop 22 are both connected to an output end of the dry filter 26, so that impurities in the pipeline can be filtered out through the dry filter 26. The gas-liquid separator 27 is provided at an input end of the compressor 23, the first circuit 21 and the second circuit 22 are converged and then connected to the input end of the gas-liquid separator 27, and the gas-liquid separator 27 can ensure that all the refrigerant flowing into the compressor 23 is gaseous. The oil separator 28 is arranged at the output end of the compressor 23, the input end of the oil separator 28 is connected with the output end of the compressor 23, the first output end of the oil separator 28 is connected with the input end of the condenser 24, the second output end of the oil separator 28 is connected with the input end of the compressor 23, the refrigerant mixed with oil can be separated through the oil separator 28, the separated refrigerant flows into the condenser 24 through the first output end of the oil separator 28, and the separated oil flows into the compressor 23 through the second output end of the oil separator 28, so that the refrigeration effect is further ensured, and energy is saved.

Further, the refrigeration mechanism 2 further includes a ball valve 207, and the first throttle assembly includes a second valve 204, a second expansion valve 205, and a second bulb 206. A ball valve 207 is provided at the output of the filter-drier unit 26 for simultaneously controlling the on/off of the first and second circuits 21, 22. A second valve 204 and a second expansion valve 205 are connected in series and disposed in the first circuit 21, the second valve 204 is preferably located between the condenser 24 and the evaporator coil 25, and the second expansion valve 205 is located between the second valve 204 and the evaporator coil 25, although the positions of the second expansion valve 205 and the second valve 204 may be reversed and are not limited thereto. The second bulb 206 is disposed at the output end of the evaporator coil 25, and the second bulb 206 is connected to the second expansion valve 205, and is configured to control the opening degree of the second expansion valve 205 according to the detected refrigerant temperature at the output end of the evaporator coil 25. Wherein the second expansion valve 205 is an internal balance thermostatic expansion valve.

In a preferred embodiment, at least two second valves 204 and two second expansion valves 205 are provided, each second valve 204 and each second expansion valve 205 are connected in series in a one-to-one correspondence manner, each set of series-connected second valves 204 and second expansion valves 205 are connected in parallel, taking the example that there are two second valves 204 and two second expansion valves 205, the rated capacities of the two second expansion valves 205 are different, that is, the amount of refrigerant that can pass through one of the second expansion valves 205 under the condition of maximum opening degree is larger than the amount of refrigerant that can pass through the other second expansion valve 205 under the condition of maximum opening degree, so that different second expansion valves 205 can be selectively opened according to different refrigeration demands, and the refrigeration mechanism 2 is more energy-saving and efficient.

This application is through the break-make of second valve 204 control evaporating coil 25 input end pipeline, and then control opening or closing of evaporating coil 25's input. In a normal condition, the second valve 204 is in an open state, and when cooling is not required, the second valve 204 is closed. The second bulb 206 is used for detecting the temperature of the refrigerant in the corresponding pipe, and the second expansion valve 205 is used for adjusting the opening degree thereof according to the temperature detected by the second bulb 206, so as to adjust the flow rate of the refrigerant flowing into the evaporation coil 25. Specifically, the higher the temperature detected by the second bulb 206, the larger the opening degree of the second expansion valve 205, and the larger the flow rate of the refrigerant flowing into the evaporation coil 25.

In the present embodiment, the first valve 201 and the second valve 204 are both provided as solenoid valves. It is understood that in other embodiments, the first valve 201 and the second valve 204 may be provided as other valves capable of controlling the on/off of the pipeline, such as ball valves, and the ball valve 207 may be replaced by a solenoid valve.

In order to further adjust the air temperature in the outdoor unit test room 1, the enthalpy difference testing device further comprises an electric heating module 5, wherein the electric heating module 5 is arranged in the equipment room 3 and used for heating the air flowing from the equipment room 3 to the outdoor unit test room 1 so as to adjust the air temperature of the outdoor unit test room 1. When the air temperature in the outer unit testing room 1 is lower than the testing temperature requirement of the air conditioner outer unit, the electric heating module 5 is turned on to heat the air flowing from the equipment room 3 to the outer unit testing room 1, and the purpose of adjusting the air temperature in the outer unit testing room 1 is achieved.

In order to simultaneously test the performance of the air conditioner indoor unit, the enthalpy difference testing device further comprises an indoor unit testing room 6, an air treatment cabinet 7 and an air quantity measuring component 8. The inner machine test room 6 is used for providing a test environment for the air conditioner inner machine, and is provided with a second opposite-opening door 61, and the inner machine test room 6 can be opened or closed through the second opposite-opening door 61 so as to conveniently place the air conditioner inner machine. Air handling cabinet 7 and air volume measuring subassembly 8 set up respectively in interior machine test room 6, can adjust the temperature, humidity etc. of interior machine test room 6 through air handling cabinet 7, make environmental parameter such as the temperature of interior machine test room 6, temperature satisfy the test environment requirement of air conditioner interior machine, can detect the air output of air conditioner interior machine through air volume measuring subassembly 8 to detect the air-out performance of air conditioner interior machine.

In this embodiment, still be provided with the opening between outer machine test suite 1 and the interior machine test suite 6, this enthalpy difference testing arrangement still includes translation door 9, and translation door 9 sets up on the opening between outer machine test suite 1 and the interior machine test suite 6, can open or close the opening between outer machine test suite 1 and the interior machine test suite 6 through translation door 9.

During specific implementation, under a normal working condition, the first valve 201 is in a closed state, and the refrigeration mechanism 2 performs normal refrigeration. When a plurality of refrigeration mechanisms are fully loaded and started simultaneously, the compressor 23 can run under the condition of high pressure ratio for a long time, when the outdoor temperature is high and the heat exchange capacity of the condenser 24 is insufficient, the exhaust temperature of the compressor 23 can be continuously high, if the exhaust temperature exceeds a preset value, the first valve 201 is opened, the first expansion valve 202 controls the opening degree according to the exhaust temperature of the compressor 23, part of refrigerant flows through the second loop 22 and flows into the input end of the compressor after converging with the refrigerant flowing through the first loop 21, so that the refrigerant flowing through the second loop 22 and the low-pressure gaseous refrigerant flowing through the first loop 21 are mixed, evaporated and absorbed to reduce the suction temperature of the compressor, the exhaust temperature of the compressor is reduced, the excessive exhaust temperature of the compressor is avoided, the refrigeration mechanisms can run continuously under the condition of high pressure ratio for a long time, and the reliability of.

The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. An enthalpy difference testing apparatus, comprising:

the air conditioner external unit testing room is used for placing an air conditioner external unit and providing a testing environment for the air conditioner external unit;

the refrigerating mechanism is used for adjusting the temperature of the outdoor unit test room so that the temperature of the outdoor unit test room meets the test temperature requirement of the air-conditioning outdoor unit;

wherein, refrigerating mechanism includes compressor, condenser, first throttle subassembly, second throttle subassembly and evaporating coil, the compressor with the condenser passes through the tube coupling, the output of condenser is connected with parallelly connected first return circuit and second return circuit, first return circuit with the second return circuit converge after with the input of compressor is connected, first throttle subassembly with evaporating coil establishes ties and locates on the first return circuit, second throttle subassembly is located on the second return circuit.

2. The enthalpy difference testing apparatus according to claim 1, wherein the second throttling assembly includes a first valve and a first expansion valve, the first valve and the first expansion valve being connected in series and disposed in the second circuit.

3. An enthalpy difference testing apparatus according to claim 2, wherein the first expansion valve is an inner balance type thermal expansion valve to which a first bulb is connected, the first bulb being provided at an output end of the compressor, the first bulb being configured to control an opening degree of the first expansion valve according to a temperature of refrigerant detected at the output end of the compressor.

4. The enthalpy difference testing apparatus according to claim 1, wherein the refrigeration mechanism further comprises a gas-liquid separator, wherein the first circuit and the second circuit converge and are connected to an input of the gas-liquid separator, and an output of the gas-liquid separator is connected to an input of the compressor.

5. An enthalpy difference testing apparatus according to claim 1, wherein the refrigeration mechanism further comprises an oil separator disposed at an output of the compressor, wherein an input of the oil separator is connected to an output of the compressor, a first output of the oil separator is connected to an input of the condenser, and a second output of the oil separator is connected to an input of the compressor.

6. An enthalpy difference testing device according to claim 1, wherein the first throttling assembly includes a second expansion valve disposed in the first circuit between the condenser and the evaporator coil.

7. An enthalpy difference testing apparatus according to claim 6, wherein the second expansion valve is an internal balance type thermal expansion valve, and a second bulb is connected thereto, the second bulb being disposed at an output end of the evaporation coil, the second bulb being configured to control an opening degree of the second expansion valve according to a detected temperature of the refrigerant at the output end of the evaporation coil.

8. An enthalpy difference testing device according to claim 6, wherein the refrigeration mechanism further includes a second valve disposed in the first circuit and in series with the second expansion valve.

9. An enthalpy difference testing device according to claim 1, wherein the refrigeration mechanism further includes a dry filter disposed at an output of the condenser, the first circuit and the second circuit each being connected to an output of the dry filter.

10. An enthalpy difference testing device according to any one of claims 1 to 9, further comprising an equipment room communicated with the outdoor unit testing room, wherein a fan is disposed in the equipment room, and the evaporation coil is disposed in the equipment room and between the fan and the outdoor unit testing room.

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