Air conditioning unit capable of improving operation reliability

Abstract

The utility model discloses an air conditioning unit capable of improving operational reliability, which comprises a compressor, an oil separator, a four-way valve, a gas-liquid separator, an electric appliance control box, a temperature adjusting unit and a cavity. The compressor, the oil separator, the four-way valve, the gas-liquid separator and the electric appliance control box are placed in the cavity, and the temperature in the cavity is controlled through the temperature adjusting unit. According to the utility model, heating parts of the unit can run in a proper temperature environment in extreme weather, and the running reliability of the air conditioning unit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an air conditioner unit for improving the reliability of high-temperature refrigeration and low-temperature heating. Background Art

[0002] When a multi-connected air conditioner system is actually applied, it often encounters extremely high-temperature weather or extremely low-temperature weather. Under such extreme weather conditions, the capacity of a conventional multi-connected unit decays severely, and many reliability problems are faced. These reliability problems often lead to the abnormal operation of the unit. For example, in extremely high-temperature weather, the refrigerant pressure in the system is high, resulting in the compressor being unable to increase its frequency, with low capacity. Moreover, the temperature of electronic components further increases after heating in a high-temperature environment, making them prone to damage. In extremely low-temperature weather, the refrigerant exists in a liquid state in the pipeline, and it is difficult to push the refrigerant during startup, resulting in insufficient refrigerant circulation in the system and the inability to quickly produce a heating effect. After the system defrosts, a large amount of liquid refrigerant will be stored in the gas-liquid separator, which also affects the refrigerant circulation volume. In addition, the compressor sucks a large amount of liquid refrigerant from the gas-liquid separator, which is not only prone to liquid hammer on the compressor but also increases the oil carry-over rate during exhaust, resulting in oil shortage for compressor lubrication. Summary of the Utility Model

[0003] The utility model provides an air conditioner unit for improving operation reliability, which can not only solve the problems of excessive system pressure, compressor frequency limitation, and excessive heat generation of electronic components in extremely high-temperature weather, but also solve the technical problems of slow system startup for heating, easy oil shortage of the compressor, and easy generation of liquid hammer in extremely low-temperature weather.

[0004] The air conditioner unit for improving operation reliability provided by the utility model includes a compressor, an oil separator, a four-way valve, a gas-liquid separator, and an electrical control box. It also includes a temperature adjustment unit and a cavity. The compressor, the oil separator, the four-way valve, the gas-liquid separator, and the electrical control box are placed in the cavity, and the temperature in the cavity is controlled by the temperature adjustment unit.

[0005] Further, one ventilation opening is respectively provided on two opposite wall surfaces of the cavity, and the other wall surfaces are sealed. The temperature adjustment unit includes a first heat exchanger and a second heat exchanger communicated with the air conditioner unit. The first heat exchanger is placed on the side of the cavity provided with the ventilation opening for cooling; the second heat exchanger is placed on the other side of the cavity provided with the ventilation opening for heating.

[0006] In one embodiment, the cavity is sealed on the front, back, left, and right, and ventilation holes are provided on the top and bottom. The first heat exchanger is placed on the upper part of the cavity and is equipped with a first fan for cooling; the second heat exchanger is placed on the lower part of the cavity and is equipped with a second fan for heating.

[0007] Preferably, the air conditioner unit includes a main electronic expansion valve and a stop valve for communicating with the terminal device of the air conditioner unit. A subcooler is provided between them. A subcooling branch is led out from the pipeline between the stop valve and the subcooler. A subcooler electronic expansion valve is provided on the subcooling branch. The refrigerant introduced into the subcooling branch enters the subcooler through the subcooler electronic expansion valve and exchanges heat with the refrigerant in the main cycle, and then flows through the subcooling solenoid valve and the pipeline to the gas-liquid separator.

[0008] Further, the temperature adjustment unit includes a first branch. One end of the first branch is connected to the pipeline between the subcooler and the main electronic expansion valve, and the other end is communicated with the inlet pipe of the gas-liquid separator. A first electronic expansion valve, a first heat exchanger and a first solenoid valve are sequentially arranged on the first branch.

[0009] Further, the temperature adjustment unit further includes a second branch. One end of the second branch is communicated with the exhaust pipeline of the air conditioner unit, and the other end is communicated with the pipeline between the subcooler and the main electronic expansion valve. A second electronic expansion valve, a second heat exchanger and a second solenoid valve are sequentially arranged on the second branch.

[0010] Preferably, an ambient temperature sensor is arranged in the cavity.

[0011] When the internal ambient temperature of the cavity is greater than the first set temperature T1, the first electronic expansion valve and the first solenoid valve are opened, and the cavity is cooled through the first heat exchanger.

[0012] When the internal ambient temperature of the cavity is less than the second set temperature T2, the second electronic expansion valve and the second solenoid valve are opened, and the cavity is heated through the second heat exchanger.

[0013] When the internal ambient temperature of the cavity is between the first set temperature T1 and the second set temperature T2, the first electronic expansion valve and the first solenoid valve, and the second electronic expansion valve and the second solenoid valve are closed, and the first heat exchanger and the second heat exchanger do not work.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] A cavity with adjustable temperature is arranged in the air conditioner unit. The heat-generating components such as the compressor, the oil separator, the gas-liquid separator and the electrical box are placed in the cavity. The temperature in the cavity is reduced or increased through the temperature adjustment unit, so that the heat-generating components operate in a suitable temperature environment, and the operation reliability of the air conditioner unit in extremely high temperature weather and extremely low temperature weather is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model will be described in detail below with reference to the drawings and embodiments, wherein:

[0017] Figure 1 This is the system diagram of the present utility model;

[0018] Figure 2 It is a schematic diagram of an embodiment of the cavity and the setting of its internal components;

[0019] Figure 3 It is the system diagram of the air conditioner unit operating under the refrigeration condition. The arrows in the figure indicate the flow direction of the refrigerant;

[0020] Figure 4 It is the system diagram of the air conditioner unit operating under the heating condition. The arrows in the figure indicate the flow direction of the refrigerant.

[0021] Description of the reference numerals in the figure:

[0022] 1 Compressor, 2 Oil separator, 3 Four-way valve, 4 Outdoor heat exchanger, 5 Main circuit electronic expansion valve, 6 Gas-liquid separator, 7 Stop valve, 8 Subcooler, 9 Subcooling branch, 10 Subcooling electronic expansion valve, 11 Subcooling solenoid valve, 12 First branch, 13 First electronic expansion valve, 14 First heat exchanger, 15 First fan, 16 First solenoid valve, 17 Second branch, 18 Second solenoid valve, 19 Second heat exchanger, 20 Second fan, 21 Second electronic expansion valve, 22 Third branch, 23 Oil return electronic expansion valve, 24 Electrical box, 25 Cavity. Detailed implementation manners

[0023] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to explain the present utility model and do not constitute a limitation to the present utility model.

[0024] The improvement idea of the present utility model lies in:

[0025] Adding a cavity and a temperature regulation unit to the air conditioner unit. One ventilation opening is respectively provided on two opposite wall surfaces of the cavity, and other wall surfaces are sealed. Heat-generating components in the air conditioner unit, such as compressors, oil separators, four-way valves, gas-liquid separators, electrical boxes and other components, are placed into the cavity, and then the temperature in the cavity is regulated through the temperature regulation unit, so that each component works in a suitable temperature environment, in order to solve the problems that in extremely high temperature weather, the system pressure is too high, the compressor frequency is limited, and the electronic components generate too much heat; and in extremely low temperature weather, the heating starts slowly, the compressor is prone to oil shortage, and liquid hammer is easy to occur.

[0026] In one embodiment, the front, back, left, and right sides of the cavity are sealed, and ventilation openings are respectively provided on the upper and lower surfaces. Heat-generating components such as a compressor, a gas-liquid separator, an oil separator, a four-way valve, and an electrical box are placed in the cavity. The temperature adjustment unit includes two branches led out from the air-conditioning system, and a heat exchanger is respectively provided on each branch. The first heat exchanger is placed in the upper part of the cavity for cooling the inside of the cavity; the second heat exchanger is placed in the lower part of the cavity for heating the inside of the cavity. A temperature sensor is provided in the cavity. According to the internal environment temperature of the cavity, it is judged whether the inside of the cavity needs to be refrigerated or heated, and relevant valves and an electronic expansion valve are adjusted to control the internal temperature of the cavity to be maintained within a suitable range.

[0027] Figure 1 This is a system diagram of the present invention. A conventional air-conditioning unit includes a compressor 1, an oil separator 2, a four-way valve 3, an outdoor heat exchanger 4, a main-circuit electronic expansion valve 5, a gas-liquid separator 6 connected in sequence by pipelines, and an indoor terminal device (not shown in the figure) connected through a stop valve 7.

[0028] A subcooler 8 can be provided between the main-circuit electronic expansion valve 5 and the stop valve 7 to increase the subcooling degree of the main-circuit electronic expansion valve. A subcooling branch 9 is led out from the pipeline between the stop valve and the subcooler. An subcooler electronic expansion valve 10 and a subcooling solenoid valve 11 are provided on the subcooling branch 9. The refrigerant introduced into the subcooling branch 9 is throttled by the subcooler electronic expansion valve and then enters the subcooler 8 to exchange heat with the refrigerant in the main cycle, and then flows to the gas-liquid separator 6 through the subcooling solenoid valve 11.

[0029] As Figure 1 and Figure 2As shown in the figure, two branches are added to the conventional air-conditioning system of the present utility model, and each branch is provided with a heat exchanger and a fan. One end of the first branch 12 is connected to the pipeline between the subcooler 8 and the main-circuit electronic expansion valve 5, and the other end is connected to the inlet pipe of the gas-liquid separator 6. The first branch is successively provided with a first electronic expansion valve 13, a first heat exchanger 14 and a first solenoid valve 16 for controlling the on-off of the first branch. When the weather is extremely hot, the first electronic expansion valve 13 and the first solenoid valve 16 are opened, and part of the refrigerant is introduced from the main circuit to cool the heating components in the cavity 25 through the first heat exchanger 14, ensuring that the heating components work within the normal operating temperature range, and avoiding problems such as the compressor being unable to increase the frequency, having low capacity, and the electronic components being easily damaged. One end of the second branch 17 is connected to the outlet pipe of the oil separator 2, and the other end is connected to the pipeline between the subcooler 8 and the main-circuit electronic expansion valve 5. The second branch is successively provided with a second electronic expansion valve 18, a second heat exchanger 19 and a second solenoid valve 21 for controlling the on-off of the second branch. The first heat exchanger is arranged at the upper ventilation opening of the cavity 25 and is equipped with a first fan 15, and the second heat exchanger is arranged at the lower ventilation opening of the cavity 25 and is equipped with a second fan 20. When the weather is extremely cold, the second electronic expansion valve 21 and the second solenoid valve 18 are opened, and part of the refrigerant is introduced from the compressor exhaust to heat the heating components in the cavity 25 through the second heat exchanger 19, avoiding that in extremely cold weather, the refrigerant exists in the pipeline in a liquid state and is difficult to push the refrigerant during startup, resulting in insufficient refrigerant circulation in the system and the inability to quickly generate a heating effect.

[0030] Preferably, the air-conditioning unit proposed by the present invention further includes a third branch 22. One end of the third branch is communicated with the liquid end of the oil separator, and the other end is communicated with the lubricating oil tank at the suction end of the compressor. A return oil electronic expansion valve 23 is provided on the third branch. The lubricating oil in the compressor exhaust is separated in the oil separator and then returns to the lubricating oil tank at the suction end of the compressor through the third branch for recycling.

[0031] Figure 2 Show the structure of an embodiment of the cavity added in the air-conditioning unit proposed by the present utility model. The cavity 25 adopts a sheet metal structure, is sealed on the front, back, left and right, and is provided with ventilation holes on the top and bottom. The heating components in the air-conditioning unit, such as the compressor 1, the oil separator 2, the four-way valve 3, the gas-liquid separator 6, the electrical box 25, etc., are placed into the cavity. The first heat exchanger 14 and the first fan 15 of the temperature adjustment unit are placed in the upper part of the cavity for cooling; the second heat exchanger 19 and the second fan 20 are placed in the lower part of the cavity for heating. The cavity adopts a structure with ventilation holes provided on the top and bottom, which is convenient for the installation of heating components such as the compressor and the electrical box and the connection of pipelines. Of course, a structure with ventilation openings provided on the left and right or the front and back can also be adopted, which can be selected according to the on-site installation conditions.

[0032] An ambient temperature sensor T is installed inside the cavity to monitor the temperature inside the cavity in real time, facilitating the unit controller to provide cooling or heating to the inside of the cavity according to the temperature inside the cavity through the temperature regulation unit, so that each component works in a suitable temperature environment, solving the problems of too high system pressure, compressor frequency limitation, and excessive heat generation of electronic components in extremely high temperature weather; and the technical problems of slow heating start, easy oil shortage of the compressor, and easy liquid hammer generation in extremely low temperature weather.

[0033] When it is detected that the internal ambient temperature of the cavity 25 is greater than the first set temperature T1, the first solenoid valve 16 is opened to cool the inside of the cavity through the first heat exchanger 14.

[0034] When it is detected that the internal ambient temperature of the cavity 25 is less than the second set temperature T2, the second solenoid valve 18 is opened to heat the inside of the cavity through the second heat exchanger 19.

[0035] When it is detected that the internal ambient temperature of the cavity is between the first set temperature T1 and the second set temperature T2, the first electronic expansion valve 13, the first solenoid valve 16, the second electronic expansion valve 21, and the second solenoid valve 18 are closed, and the first heat exchanger 14 and the second heat exchanger 19 do not work.

[0036] Figure 3 It is a system diagram of the air conditioner unit operating in the refrigeration condition. The arrows in the figure indicate the flow direction of the refrigerant. When the ambient temperature is extremely high and the unit operates in the refrigeration mode, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 flows through the oil separator 2 and the four-way valve 3 and then to the outdoor heat exchanger 4. The refrigerant condenses into a high-pressure and medium-temperature liquid refrigerant in the outdoor heat exchanger, and then becomes a low-temperature and low-pressure liquid refrigerant after being depressurized by the main circuit electronic expansion valve 5. This liquid refrigerant is divided into two paths. One path is the main path, which is sent to the indoor terminal device for refrigeration after passing through the cooler 8. The other path flows through the first branch 12 to the first heat exchanger 14 to exchange heat with the air inside the cavity 25, reducing the temperature of the heat-generating components inside the cavity and controlling the temperature of the heat-generating components to operate within a reasonable range. The refrigerant at the outlet of the first heat exchanger flows through the first solenoid valve 16 to the gas-liquid separator 6, and the gaseous refrigerant after separating the liquid refrigerant is sent to the suction port of the compressor 1 for circulation. By introducing part of the refrigerant through the first branch to provide cooling to the cavity through the first heat exchanger, the heat-generating components can operate in a suitable temperature environment in extremely high temperature weather, improving the operating reliability of the air conditioner unit in extremely high temperature weather.

[0037] Figure 4It is a system diagram for the air conditioner unit operating in the heating mode. The arrows in the figure indicate the flow direction of the refrigerant. When the environmental temperature is extremely low and the unit operates in the heating mode, the exhaust gas of the compressor 1 is divided into two paths after passing through the oil separator 2. Most of the refrigerant is sent to the indoor terminal device for heating through the four-way valve 3, and then returns to the compressor for circulation after passing through the cooler 8, the main electronic expansion valve 5, the outdoor heat exchanger 4, the four-way valve 3 and the gas-liquid separator 6. A small part of the refrigerant returns to the compressor for circulation after passing through the second electronic expansion valve 21, the second heat exchanger 19, the second solenoid valve 18 and the gas-liquid separator 6 on the second branch 17. The second branch introduces part of the refrigerant to provide heat to the chamber through the second heat exchanger, so that in extremely low temperature weather, the heating components can operate in a suitable temperature environment, improving the operating reliability of the air conditioner unit in extremely low temperature weather and avoiding the liquid hammer failure of the compressor at the same time.

[0038] An environmental temperature sensor T is set in the cavity 25. When the internal environmental temperature T of the cavity is greater than the first set temperature T1, i.e., T > T1, it is considered that the environmental temperature is too high, and it is necessary to provide cooling capacity to the inside of the cavity through the first branch to control the temperature inside it within a reasonable range; when the internal environmental temperature T of the cavity is less than the second set temperature T2, i.e., T < T2, it is considered that the environmental temperature is too low, and it is necessary to provide heat to the inside of the cavity through the second branch to control it within a reasonable range; when the internal environmental temperature T of the cavity is between the first set temperature T1 and the second set temperature T2, i.e., T1 ≥ T ≥ T2, it means that the internal environmental temperature of the cavity is within a reasonable temperature range. At this time, the first solenoid valve 16 and the first electronic expansion valve 13, as well as the second electronic expansion valve 21 and the second solenoid valve 18 are closed, and the first heat exchanger 14 and the second heat exchanger 19 do not work.

[0039] When the cavity needs to provide cooling capacity, the first electronic expansion valve 13 and the first solenoid valve 16 are opened, and the first fan 15 is started. The refrigerant introduced into the circulation main path passes through the throttling of the first electronic expansion valve 13 and enters the first heat exchanger 14 to evaporate and absorb heat. The cold air enters the cavity through the first fan 15 to lower the internal temperature of the cavity. When the internal temperature of the cavity reaches the target temperature, the first fan 15 stops, and the first electronic expansion valve is adjusted to the preset opening A1. At this time, the first solenoid valve 16 is closed. The purpose of setting the first solenoid valve is to prevent the refrigerant from staying in the first heat exchanger when there is no need to provide cooling capacity to the cavity, affecting the heat exchange effect of the main path.

[0040] When heat needs to be provided to the cavity, the second electronic expansion valve 21 and the second solenoid valve 18 are opened, and the second fan 20 is started. The gaseous refrigerant passes through the second electronic expansion valve and enters the second heat exchanger 19 to condense and release heat. The hot air enters the cavity through the second fan 20 to increase the internal temperature of the cavity. When the internal temperature of the cavity reaches the target temperature, the second fan 20 stops operating, and the second electronic expansion valve is adjusted to the preset opening A2. At this time, the second solenoid valve 18 is closed. The purpose of setting the second solenoid valve is to prevent the refrigerant from staying in the second heat exchanger when heat does not need to be provided to the cavity, which may affect the heat exchange effect of the main circuit.

[0041] The terms used in this specification are only for describing specific embodiments and are not intended to limit the present invention. Unless specifically stated otherwise, the relative arrangements of components and steps, numerical expressions, and values described in these embodiments do not limit the protection scope of the present invention.

[0042] The technologies, methods, and devices known to those of ordinary skill in the relevant art are not discussed in detail in this specification, but where appropriate, such technologies, methods, and devices should be regarded as part of this specification. Any specific value in this specification should be interpreted as merely exemplary and not as a limitation to the present invention.

[0043] For the convenience of description, the terms used in the specification to describe positions, such as "above...", "to the left of...", "in front of...", etc., are only used to describe the spatial position relationship between a certain component and other components in the embodiments shown in the drawings. When the position where the component is placed changes, the relative position will also change. Therefore, the positional relationship in the embodiments of the drawings should not limit the present invention.

[0044] In addition, it should be noted that the terms "first", "second", etc. used in the specification are only for differentiating similar components and do not have a sequential order. Therefore, they should not be construed as limiting the protection scope of the present invention.

[0045] The above embodiments are only used to illustrate the specific embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and variations can be made, and these modifications and variations should all fall within the protection scope of the present utility model.

Claims

1. An air conditioning unit with improved operating reliability, comprising a compressor, an oil separator, a four-way valve, a gas-liquid separator and an electrical control box, characterized in that: It also includes a temperature regulating unit and a cavity, wherein the compressor, the oil separator, the four-way valve, the gas-liquid separator and the electrical control box are placed in the cavity, and the temperature in the cavity is controlled by the temperature regulating unit.

2. The air conditioning unit according to claim 1, characterized in that: The two opposite walls of the cavity are respectively provided with a vent, and the other walls are sealed. The temperature adjustment unit includes a first heat exchanger and a second heat exchanger connected to the air-conditioning unit. The first heat exchanger is placed on the side of the cavity with the vent for cooling; the second heat exchanger is placed on the other side of the cavity with the vent for heating.

3. The air conditioning unit according to claim 2, characterized in that: The cavity is sealed front, back, left and right, and has ventilation holes at the top and bottom. The first heat exchanger is placed at the upper part of the cavity and is equipped with a first fan for cooling; the second heat exchanger is placed at the lower part of the cavity and is equipped with a second fan for heating.

4. The air conditioning unit according to claim 1, characterized in that: The air-conditioning unit includes a main electronic expansion valve and a stop valve for connecting with the terminal device of the air-conditioning unit, a subcooler is arranged between the two, a subcooling branch is led out on the pipeline between the stop valve and the subcooler, a subcooling branch is provided with a subcooling electronic expansion valve, the refrigerant introduced into the subcooling branch passes through the subcooler electronic expansion valve and then enters the subcooler to exchange heat with the refrigerant in the main cycle, and then flows to the gas-liquid separator through the cold solenoid valve and the pipeline.

5. The air conditioning unit according to claim 4, characterized in that: The temperature regulating unit includes a first branch, one end of which is connected to the pipeline between the subcooler and the main electronic expansion valve, and the other end is connected to the inlet pipe of the gas-liquid separator. The first branch is provided with a first electronic expansion valve, a first heat exchanger and a first solenoid valve in sequence.

6. The air conditioning unit according to claim 5, characterized in that: The temperature regulating unit includes a second branch, one end of which is connected to the exhaust duct of the air-conditioning unit, and the other end is connected to the pipeline between the subcooler and the main electronic expansion valve. The second branch is provided with a second electronic expansion valve, a second heat exchanger and a second solenoid valve in sequence.

7. The air conditioning unit according to claim 1, characterized in that: An ambient temperature sensor is arranged in the cavity.

8. The air conditioning unit according to claim 5, characterized in that: When the ambient temperature inside the cavity is greater than the first set temperature T1, the first electronic expansion valve and the first solenoid valve are opened to cool the cavity through the first heat exchanger.

9. The air conditioning unit according to claim 6, characterized in that: When the ambient temperature inside the cavity is lower than the second set temperature T2, the second electronic expansion valve and the second solenoid valve are opened to heat the cavity through the second heat exchanger.

10. The air conditioning unit according to claim 6, characterized in that: When the ambient temperature inside the cavity is between the first set temperature T1 and the second set temperature T2, the first electronic expansion valve and the first solenoid valve, the second electronic expansion valve and the second solenoid valve are closed, and the first heat exchanger and the second heat exchanger do not work.

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