Air conditioning system

Abstract

The utility model relates to the technical field of air conditioners, in particular to an air conditioning system, and aims to solve the technical problem that a refrigerant pump of an existing air suspension compressor unit is short in service life. In order to achieve the purpose, the air conditioning system comprises an air suspension type compressor, an outdoor heat exchanger, an indoor heat exchanger and a liquid supply tank, a second outlet of the liquid supply tank is connected to a bearing inlet of the compressor, and the indoor heat exchanger is connected with the outdoor heat exchanger through a first pipeline; the first pipeline is connected with a liquid inlet of the liquid supply tank through a first liquid supply pipe, and a first control valve is arranged on the first liquid supply pipe; and when liquid needs to be supplemented to the liquid supply tank, the first control valve is opened to supplement the liquid to the liquid supply tank, so that the liquid level in the liquid supply tank is kept at the required liquid level. In addition, a second liquid supply pipe, a second control valve, a fourth control valve, a refrigerant pump and the like are further arranged, through cooperation of the liquid supply pipes and the control valves, the working frequency of the refrigerant pump and electric heating is reduced, and the service life of parts is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technical field, specifically provide a kind of air conditioning system. BACKGROUND

[0002] Gas suspension compressor is especially suitable for application in refrigeration system due to its high speed, oil-free, high efficiency, low noise, micro-vibration, small size and other advantages, and basically no maintenance is needed.

[0003] The principle of the static pressure gas suspension bearing of the gas suspension compressor is that the liquid refrigerant is delivered to the porous static pressure gas bearing, is discharged from the gas bearing and collected into the cavity of the motor, and then is returned to the evaporator together with the refrigerant for cooling the motor. The pressure difference of the refrigerant entering and exiting the bearing generates buoyancy, which stably suspends the compressor rotor. The liquid refrigerant entering the bearing also functions as liquid level lubrication and partially vaporizes to reduce temperature and cool the bearing. The suspension pressure difference ΔP=P1 (supply tank pressure)-P2 (cavity pressure). If high-pressure refrigerant gas is supplied to the bearing, the gas condenses due to the temperature difference of components in the compressor, and the gas loses pressure. Therefore, liquid supply is a reliable solution for the static pressure gas suspension bearing.

[0004] The existing liquid supply scheme supplies liquid to the liquid supply tank by the refrigerant pump, which reduces the service life of the refrigerant pump.

[0005] Therefore, there is an urgent need for an air conditioning system to solve the above technical problems. SUMMARY

[0006] The utility model aims at solving the above technical problems, i.e., solving the technical problem of low service life of the refrigerant pump of the existing gas suspension compressor unit.

[0007] In a first aspect, the utility model provides an air conditioning system, which comprises a gas suspension compressor, an outdoor heat exchanger, an indoor heat exchanger and a liquid supply tank. The second outlet of the liquid supply tank is connected to the bearing inlet of the compressor. The indoor heat exchanger and the outdoor heat exchanger are connected by a first pipeline.

[0008] The first pipeline is connected to the liquid inlet of the liquid supply tank by a first liquid supply pipe. The first liquid supply pipe is provided with a first control valve.

[0009] In the specific embodiment of the above air conditioning system, the first pipeline is also connected to the liquid inlet of the liquid supply tank by a second liquid supply pipe. The second liquid supply pipe is provided with a second control valve and a refrigerant pump.

[0010] The second control valve and the refrigerant pump are used to control the flow of liquid supplement to the liquid supply tank.

[0011] In the specific embodiment of the air conditioning system, the refrigerant pump is arranged upstream of the second control valve, and the second control valve is connected with the first pipeline through a first liquid supply pipe;

[0012] The first control valve is a one-way valve, which only allows the refrigerant to flow from the first pipeline to the second control valve.

[0013] In the specific embodiment of the air conditioning system,

[0014] A first pressure detection member is arranged in the cavity of the compressor, and a second pressure detection member is arranged in the high-pressure side heat exchanger; and a liquid level detection member is arranged on the liquid supply tank to detect the liquid level of the liquid refrigerant in the liquid supply tank;

[0015] After the compressor is started, when the pressure difference between the pressure value detected by the second pressure detection member and the pressure value detected by the first pressure detection member is less than the current suspension pressure difference, the refrigerant pump and the second control valve are opened, so that the refrigerant pump transports the refrigerant to the liquid supply tank through the second liquid supply pipe; and / or

[0016] After the compressor is started, and when the refrigerant pump and the second control valve are in the open state, if the liquid level detected by the liquid level detection member is less than a first set liquid level, the delivery capacity of the refrigerant pump is increased, and the opening degree of the second control valve is increased to increase the liquid level of the liquid supply tank; if the liquid level detected by the liquid level detection member is greater than a second set liquid level, the delivery capacity of the refrigerant pump is reduced, and the opening degree of the second control valve is reduced to reduce the liquid level of the liquid supply tank; wherein the first set liquid level is lower than the second set liquid level; and / or

[0017] After the compressor is started, when the pressure difference between the pressure value detected by the second pressure detection member and the pressure value detected by the first pressure detection member is greater than the current suspension pressure difference, the second control valve is opened, and the refrigerant pump is closed, so that the first liquid supply pipe and the part of the second liquid supply pipe downstream of the first liquid supply pipe transport the refrigerant to the liquid supply tank; and / or

[0018] After the compressor is started, when the second control valve is in the open state and the refrigerant pump is in the closed state, if the liquid level detected by the liquid level detection member is less than a first set liquid level, the opening degree of the second control valve is increased to increase the liquid level of the liquid supply tank; if the liquid level detected by the liquid level detection member is greater than a second set liquid level, the opening degree of the second control valve is reduced to reduce the liquid level of the liquid supply tank; wherein the first set liquid level is lower than the second set liquid level.

[0019] In the specific embodiment of the air conditioning system, the outdoor heat exchanger and the indoor heat exchanger are further connected through a second pipeline, the second pipeline is further connected with the liquid inlet of the liquid supply tank through a second liquid supply pipe, and the second liquid supply pipe is provided with a second control valve and a refrigerant pump.

[0020] The second control valve and the refrigerant pump are used to control the flow of liquid supplement to the liquid supply tank.

[0021] In the specific embodiment of the air conditioning system, a first pressure detection member is arranged in the cavity of the compressor, and a second pressure detection member is arranged in the high-pressure side heat exchanger; a liquid level detection member is arranged on the liquid supply tank to detect the liquid level of the liquid refrigerant in the liquid supply tank.

[0022] After the compressor is started, when the pressure difference between the pressure value detected by the second pressure detection member and the pressure value detected by the first pressure detection member is less than the current suspension pressure difference, the first control valve is closed, the refrigerant pump and the second control valve are opened, so that the refrigerant pump transports refrigerant to the liquid supply tank through the second liquid supply pipe; and / or

[0023] After the compressor is started, the first control valve is in a closed state, and the refrigerant pump and the second control valve are in an open state, when the liquid level detected by the liquid level detection member is less than a first set liquid level, the delivery capacity of the refrigerant pump is increased, and the opening degree of the second control valve is increased to increase the liquid level of the liquid supply tank; when the liquid level detected by the liquid level detection member is greater than a second set liquid level, the delivery capacity of the refrigerant pump is reduced, and the opening degree of the second control valve is reduced to reduce the liquid level of the liquid supply tank; wherein the first set liquid level is lower than the second set liquid level; and / or

[0024] After the compressor is started, when the pressure difference between the pressure value detected by the second pressure detection member and the pressure value detected by the first pressure detection member is greater than the current suspension pressure difference, the first control valve is opened, and the refrigerant pump and the second control valve are closed, so that the first liquid supply pipe transports refrigerant to the liquid supply tank; and / or

[0025] After the compressor is started, the first control valve is in an open state, and the refrigerant pump and the second control valve are in a closed state, when the liquid level detected by the liquid level detection member is less than a first set liquid level, the opening degree of the first control valve is increased to increase the liquid level of the liquid supply tank; when the liquid level detected by the liquid level detection member is greater than a second set liquid level, the opening degree of the first control valve is reduced; wherein the first set liquid level is lower than the second set liquid level.

[0026] In the specific embodiment of the air conditioning system, the liquid supply tank is provided with an electric heater for heating the refrigerant in the liquid supply tank.

[0027] When the liquid level detected by the liquid level detection member is not less than the first set liquid level before starting, the electric heater is turned on to heat the refrigerant in the liquid supply tank to establish the suspension pressure difference.

[0028] In the specific embodiment of the air conditioning system, the second exhaust port of the liquid supply tank is connected to the low-pressure side heat exchanger through a second exhaust pipe, and the second exhaust pipe is provided with a fourth control valve.

[0029] When the first control valve or the second control valve is opened during shutdown, the fourth control valve is opened; and / or

[0030] After the compressor is started, when the current suspension pressure difference is greater than the second set pressure, the fourth control valve is opened.

[0031] In the specific embodiment of the air conditioning system, a filter is further arranged on the second liquid supply pipe upstream of the refrigerant pump; and / or

[0032] A second one-way valve is further arranged on the second liquid supply pipe downstream of the second control valve.

[0033] In the specific embodiment of the air conditioning system, a third control valve is arranged on the first pipeline, and the third control valve is arranged on one side of the first liquid supply pipe close to the low-pressure side heat exchanger; and the third control valve is closed when the compressor is running.

[0034] In the technical scheme, the air conditioning system comprises a gas suspension type compressor, an outdoor heat exchanger, an indoor heat exchanger and a liquid supply tank, the second outlet of the liquid supply tank is connected to the bearing inlet of the compressor, and the indoor heat exchanger and the outdoor heat exchanger are connected through a first pipeline; the first pipeline is connected to the liquid inlet of the liquid supply tank through a first liquid supply pipe, and the first liquid supply pipe is provided with a first control valve; when it is necessary to supplement the liquid supply tank and the pressure difference between the high-pressure side heat exchanger and the compressor is greater than the current suspension pressure difference, the first control valve is opened, the high-pressure side heat exchanger can supplement the liquid supply tank through the first liquid supply pipe, the use time of the refrigerant pump can be reduced, and the service life of the refrigerant pump can be increased.

[0035] The indoor heat exchanger and the outdoor heat exchanger are further connected through a second pipeline, the first pipeline or the second pipeline is connected with the liquid inlet of the liquid supply tank through a second liquid supply pipe, or the second liquid supply pipe is connected with the first pipeline; the second liquid supply pipe is provided with a second control valve and a refrigerant pump; when the pressure difference between the high-pressure side heat exchanger and the compressor is not greater than the current suspension pressure difference, the second control valve and the refrigerant pump are opened to supply the liquid supply tank with refrigerant; the liquid supply tank can be normally supplied with refrigerant, so that the compressor can be normally operated.

[0036] The liquid supply tank is arranged below the indoor heat exchanger and the outdoor heat exchanger, when the machine is stopped, the first control valve is opened to supply the liquid supply tank with liquid by gravity, the time length for the liquid supply tank to be supplied with liquid before the compressor is started is reduced, and then the starting preparation time length is reduced, that is, the starting feedback time length is reduced, so that the user experience is better.

[0037] In addition, after the compressor is started, the opening degree of the first control valve and / or the second control valve is controlled, so that the liquid level in the liquid supply tank is between the first preset liquid level and the second preset liquid level, and the suspension pressure difference is between the first preset suspension pressure difference and the second preset suspension pressure difference, so that the compressor can be normally operated.

[0038] Furthermore, through cooperation of the liquid supply pipelines and the control valves, the working frequency of the refrigerant pump and the electric heater is reduced, and the service life of components is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0039] The preferred embodiments of the utility model are described below in combination with the drawings, and the drawings are as follows:

[0040] Figure 1 is the structure schematic view of the air conditioning system provided by the embodiment one of the utility model;

[0041] Figure 2 is the structure schematic view of the air conditioning system provided by the embodiment two of the utility model;

[0042] Figure 3 is the structure schematic view of the air conditioning system provided by the embodiment three of the utility model;

[0043] Figure 4 is the structure schematic view of the air conditioning system provided by the embodiment four of the utility model.

[0044] List of reference signs: 1, compressor; 11, first pressure detecting member; 2, condenser; 21, second pressure detecting member; 22, first pipeline; 221, third control valve; 222, fifth control valve; 23, second pipeline; 231, first throttling element; 232, second throttling element; 3, evaporator; 4, liquid supply tank; 41, electric heater; 42, liquid level detecting member; 43, second liquid supply pipeline; 431, second control valve; 432, refrigerant pump; 433, filter; 434, second check valve; 44, liquid supplement pipeline; 45, second exhaust pipeline; 451, fourth control valve; 46, first liquid supply pipeline; 461, first control valve; 5, flash cylinder. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present application will be described below with reference to the drawings. It should be understood by those skilled in the art that the embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0046] It should be noted that, in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the direction or positional relationship terms based on the direction or positional relationship shown in the drawings, which are only for the convenience of description, and are not intended to indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0047] In addition, it should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In order to solve the technical problem that the refrigerant liquid level in the liquid supply tank is too low before starting the existing machine. The present application discloses an air conditioning system, which will be described in detail in five embodiments.

[0049] Embodiment one

[0050] As shown in Figure 1 The present embodiment discloses an air conditioning system, which comprises a compressor 1, an outdoor heat exchanger, an indoor heat exchanger and a liquid supply tank 4. The compressor 1 is connected with the indoor heat exchanger and the outdoor heat exchanger through a four-way valve, and the working mode of the air conditioning system is switched through the four-way valve.

[0051] The following will be described in detail with the case in the refrigeration mode, at this time the outdoor heat exchanger as condenser 2, evaporator 3 as evaporator 3. The exhaust port of compressor 1 is connected to the condenser 2, the suction port is connected to the evaporator 3.

[0052] The second outlet of the liquid supply tank 4 is connected to the bearing inlet of the compressor 1 through the air supply pipe. The compressor 1 needs to supply refrigerant to the compressor 1 at any time during operation, so that the air bearing can be suspended, so that the compressor 1 can operate normally. The pressure in the liquid supply tank 4 is greater than the pressure in the compressor 1 cavity, so that the liquid supply tank 4 can deliver refrigerant to the cavity to ensure that the air bearing is suspended, thereby enabling the compressor 1 to operate normally.

[0053] The indoor heat exchanger and the outdoor heat exchanger are connected by the first pipeline 22, and the first pipeline 22 is specifically connected to the liquid tank of the indoor heat exchanger and the liquid tank of the outdoor heat exchanger. The first pipeline 22 is connected to the liquid inlet of the liquid supply tank 4 through the second liquid supply pipe 43, and the second control valve 431 and the refrigerant pump 432 are arranged on the second liquid supply pipe 43.

[0054] Among them, the third control valve 221 is arranged on the first pipeline 22, which is specifically located between the connection of the second liquid supply pipe 43 and the first pipeline 22 and the evaporator 3. The second control valve 431, the third control valve 221 and the fourth control valve 451 are all solenoid valves or electric ball valves, and the opening of which can be controlled.

[0055] The second exhaust port of the liquid supply tank 4 is connected to the low-pressure side heat exchanger, that is, the evaporator 3, through the second exhaust pipe 45. Specifically, the second exhaust pipe 45 is connected to the indoor heat exchanger and the outdoor heat exchanger through a three-way valve. In the refrigeration mode, the second exhaust pipe 45 is connected to the indoor heat exchanger, and in the heating mode, it is connected to the outdoor heat exchanger. The fourth control valve 451 is arranged on the second exhaust pipe 45 for controlling whether the liquid supply tank 4 is exhausted. When the first control valve 461 and / or is opened, the fourth control valve 451 is opened to avoid the pressure in the liquid supply tank 4 being too high to cause the liquid supply tank 4 to be unable to supply refrigerant. In addition, after the compressor 1 is started, and the current suspension pressure difference is greater than the second set pressure, the fourth control valve 451 is opened to release the pressure of the liquid supply tank 4 to avoid the current suspension pressure difference being too large to cause the compressor 1 to operate abnormally.

[0056] The second pipeline 23 is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the first throttling element 231 is arranged on the second pipeline 23; wherein the first throttling element 231 is specifically an electronic expansion valve; when the air conditioner system operates normally, the refrigerant after heat exchange through the outdoor heat exchanger flows to the indoor heat exchanger through the second pipeline 23 for heat exchange.

[0057] The air conditioning system further comprises a filter 433 and a second one-way valve 434, both of which are arranged on the second liquid supply pipe 43, wherein the filter 433 is arranged upstream of the refrigerant pump 432. The second one-way valve 434 is arranged downstream of the second control valve 431.

[0058] An electric heater 41 is arranged in the liquid supply tank 4. Specifically, the electric heater 41 can be arranged at a position close to the lower side of the liquid supply tank 4. The electric heater 41 can rapidly increase the pressure of the refrigerant in the liquid supply tank 4, so that the refrigerant in the liquid supply tank 4 is rapidly changed into gaseous refrigerant with high pressure, thereby supplementing the gaseous refrigerant in the cavity of the compressor 1. In addition, when the liquid level in the liquid supply tank 4 is normal but the pressure of the refrigerant is lower than a first set pressure, the heating power of the electric heater 41 is increased, so that the pressure of the refrigerant in the liquid supply tank 4 is rapidly increased. When the pressure of the refrigerant in the liquid supply tank 4 is greater than a second set pressure, the heating power of the electric heater 41 is decreased, and the fourth control valve 451 is opened to release pressure, so that the pressure of the refrigerant is decreased. The second set pressure is greater than the first set pressure, and the pressure before the first set pressure and the second set pressure is the suspension pressure for normal operation of the gas suspension.

[0059] A liquid level detection member 42 is arranged on the liquid supply tank 4, for detecting the liquid level of the liquid refrigerant in the liquid supply tank 4. When the machine is about to be started and the liquid level of the liquid supply tank 4 is less than a first set liquid level, the second control valve 431, the refrigerant pump 432, the third control valve 221 and the fourth control valve 451 are opened, so that the liquid refrigerant in the indoor heat exchanger, the outdoor heat exchanger and the first pipeline 22 is supplemented into the liquid supply tank 4. During the liquid supplementing process, when the liquid level of the liquid supply tank 4 is greater than a second set liquid level, the second control valve 431, the refrigerant pump 432, the third control valve 221 and the fourth control valve 451 are closed, and the electric heater 41 is opened, so that the gas pressure in the liquid supply tank 4 is increased, and the suspension pressure difference is established, thereby supplementing the gas in the cavity.

[0060] When the machine is about to be started and the liquid level of the liquid supply tank 4 is greater than the second set liquid level, the second control valve 431, the refrigerant pump 432, the third control valve 221 and the fourth control valve 451 are closed, and the electric heater 41 is opened, so that the gas pressure in the liquid supply tank 4 is increased, and the suspension pressure difference is established, thereby supplementing the gas in the cavity.

[0061] A first pressure detection member 11, specifically a pressure sensor, is arranged in the cavity, for detecting the pressure in the cavity. A second pressure detection member 21, specifically a pressure sensor, is arranged on the condenser 2, for detecting the pressure of the condenser 2, which is the high-pressure pressure. A third pressure detection member, specifically a pressure sensor, is arranged in the liquid supply tank 4, for detecting the pressure in the liquid supply tank 4. The pressure difference between the pressure in the liquid supply tank 4 and the pressure in the cavity of the compressor is the suspension pressure difference.

[0062] The liquid supply tank 4 is connected to the first pipeline 22 through a first liquid supply pipe 46, and the first liquid supply pipe 46 is provided with a first control valve 461. The first control valve 461 is an electromagnetic valve or an electric ball valve, and the opening degree of the first control valve 461 can be controlled.

[0063] Preferably, the liquid supply tank 4 is located below the indoor heat exchanger and the outdoor heat exchanger; when the system is stopped, the first control valve 461 is opened, and under the action of gravity, the liquid refrigerant in the indoor heat exchanger, the outdoor heat exchanger and the first pipeline 22 can be supplemented into the liquid supply tank 4. The third control valve 221 and the fourth control valve 451 are opened; opening the fourth control valve 451 can avoid the pressure in the liquid supply tank 4 being too high, thereby ensuring that the liquid supply tank 4 can be successfully replenished with liquid.

[0064] When the pressure difference between the pressure value detected by the second pressure detection member 21 and the pressure value detected by the first pressure detection member 11 is less than the current suspension pressure difference after the compressor 1 is started, it means that the pressure on the high-pressure side is not high enough to automatically replenish the liquid supply tank 4 with liquid through the condenser, so the first control valve 461 is closed, the refrigerant pump 432 and the second control valve are opened; and the delivery capacity of the refrigerant pump 432 and the opening degree of the second control valve 431 are controlled to make the refrigerant pump 432 deliver refrigerant to the liquid supply tank 4 through the second liquid supply pipe 43; and the liquid level in the liquid supply tank 4 is maintained at a normal liquid level. Specifically, the liquid level is maintained between a first preset liquid level and a second preset liquid level. The first preset liquid level is lower than the second preset liquid level.

[0065] When the liquid level detected by the liquid level detection member 42 is less than the first preset liquid level after the compressor 1 is started and the refrigerant pump 432 and the second control valve 431 are both opened, the delivery capacity of the refrigerant pump is increased, and the opening degree of the second control valve 431 is increased to increase the liquid level of the liquid supply tank 4; and the liquid level in the liquid supply tank 4 is restored to the normal liquid level. When the liquid level detected by the liquid level detection member 42 is greater than the second preset liquid level, the delivery capacity of the refrigerant pump 432 is reduced, and the opening degree of the second control valve 431 is reduced to reduce the liquid level of the liquid supply tank 4; and the liquid level in the liquid supply tank 4 is restored to the normal liquid level.

[0066] When the pressure difference between the pressure value detected by the second pressure detection member 21 and the pressure value detected by the first pressure detection member 11 is greater than the current suspension pressure difference after the compressor 1 is started, it means that the high pressure of the condenser is high enough to automatically replenish the liquid supply tank 4 with liquid through the condenser, so the first control valve 461 is opened, the second control valve 431 and the refrigerant pump 432 are closed, and the opening degree of the first control valve 461 is controlled to make the first liquid supply pipe 46 deliver refrigerant to the liquid supply tank 4.

[0067] After compressor 1 starts, and the first control valve 461 is open while the second control valve 431 and refrigerant pump 432 are closed, if the liquid level detected by level sensor 42 is lower than the first set liquid level, the opening of the first control valve 461 is increased to increase the liquid level in supply tank 4, thus restoring the liquid level in supply tank 4 to the normal level. If the liquid level detected by level sensor 42 is higher than the second set liquid level, the opening of the first control valve 461 is decreased, thus restoring the liquid level in supply tank 4 to the normal level.

[0068] Example 2

[0069] like Figure 2 As shown, this embodiment discloses an air conditioning system, which has a structure that is basically the same as the air conditioning system in Embodiment 1. The difference is that the first control valve 461 is specifically a one-way valve, which only allows refrigerant to flow from the first pipeline 22 to the second control valve 431.

[0070] When the machine is shut down, the second control valve 431 is opened so that the liquid refrigerant in the indoor heat exchanger, the outdoor heat exchanger and the first pipeline 22 is replenished to the liquid supply tank 4 through the first liquid supply pipe 46, the second control valve 431 and the part of the second liquid supply pipe 43 located downstream of the washing liquid supply pipe 46.

[0071] After the compressor 1 starts, when the pressure difference between the condenser 2 and the pressure inside the machine cavity is less than the current suspension pressure difference, the refrigerant pump 432 and the second control valve 431 are opened so that the refrigerant pump 432 delivers refrigerant to the supply tank 4 through the second supply pipe 43.

[0072] Furthermore, after compressor 1 starts and refrigerant pump 432 and second control valve 431 open, if the liquid level detected by level sensor 42 is lower than the first set liquid level, the delivery capacity of refrigerant pump 432 is increased, and the opening of second control valve 431 is increased to increase the liquid level in supply tank 4, so that the liquid level in supply tank 4 reaches the normal liquid level. If the liquid level detected by level sensor 42 is higher than the second set liquid level, the delivery capacity of refrigerant pump 432 is decreased, and the opening of second control valve 431 is decreased to lower the liquid level in supply tank 4, so that the liquid level in supply tank 4 reaches the normal liquid level.

[0073] After the compressor 1 starts, when the pressure difference between the condenser 2 and the pressure inside the machine cavity is greater than the current floating pressure difference, the second control valve 431 is opened and the refrigerant pump 432 is turned off, so that the portion of the first liquid supply pipe 46 and the second liquid supply pipe 43 downstream of the first liquid supply pipe 46 supplies refrigerant to the liquid supply tank 4.

[0074] Preferably, after compressor 1 starts and refrigerant pump 432 and second control valve 461 are open; if the liquid level detected by liquid level sensor 42 is lower than the first set liquid level, the opening of second control valve 431 is increased to increase the liquid level in supply tank 4 so that the liquid level in supply tank 4 reaches the normal liquid level. If the liquid level detected by liquid level sensor 42 is higher than the second set liquid level, the opening of second control valve 431 is decreased to decrease the liquid level in supply tank 4 so that the liquid level in supply tank 4 reaches the normal liquid level.

[0075] Example 3

[0076] like Figure 3 As shown, this embodiment discloses an air conditioning system, which has a structure that is basically the same as the air conditioning system in Embodiment 3, except that the air conditioning system also includes a flash evaporator 5.

[0077] A flash evaporator 5 is installed on the second pipeline 23, located between the first throttling element 231 and the outdoor heat exchanger; a second throttling element 232 is installed on the second pipeline 23, located between the outdoor heat exchanger and the flash evaporator 5. Both the first throttling element 231 and the second throttling element 232 are electronic expansion valves. The specific control method is the same as in Embodiment 1.

[0078] Example 4

[0079] like Figure 4 As shown, this embodiment discloses an air conditioning system, which has a structure that is basically the same as the air conditioning system in Embodiment 1. The difference is that the air conditioning system also includes a flash evaporator 5; and the connection position of the second liquid supply pipe is different.

[0080] A first throttling element 231, a flash evaporator 5, and a second throttling element 232 are provided on the first pipeline 22; wherein the first throttling element 231 and the second throttling element 232 are both electronic expansion valves.

[0081] The liquid supply tank 4 is located below the outdoor heat exchanger and the indoor heat exchanger; the liquid supply tank 4 is connected to the second pipeline 23 through the first liquid supply pipe 46, and the connection point is located on the side close to the low-pressure heat exchanger.

[0082] A first control valve 461 is provided on the first liquid supply pipe 46. When the machine is stopped, the first control valve 461, the first throttling element 231 and the second throttling element 232 are opened to replenish the liquid refrigerant in the indoor heat exchanger, the outdoor heat exchanger and the second pipe 23 into the liquid supply tank 4.

[0083] The second liquid supply pipe 43 connects the second pipeline 23 and the liquid supply tank 4, and the fifth control valve 222 is arranged on the second pipeline 23, specifically between the connection of the second liquid supply pipe 43 and the second pipeline 23 and the condenser 2. The fifth control valve 222 is specifically an electromagnetic valve or an electric ball valve. When the system is stopped, the third control valve 221 and the fifth control valve 222 are both in the open state. After the compressor is started, the third control valve 221 is in the closed state, and the fifth control valve 222 is in the open state, so that the condenser 2 can only deliver refrigerant to the liquid supply tank 4.

[0084] When the pressure difference between the pressure value detected by the second pressure detection member 21 and the pressure value detected by the first pressure detection member 11 is less than the current suspension pressure difference after the compressor 1 is started, the first control valve 461 is closed, and the refrigerant pump 432 and the second control valve 431 are opened, so that the refrigerant pump 432 delivers refrigerant to the liquid supply tank 4 through the second liquid supply pipe 43.

[0085] When the liquid level detected by the liquid level detection member 42 is less than the first set liquid level after the compressor 1 is started, the first control valve 461 is closed, and the refrigerant pump 432 and the second control valve 431 are opened, the delivery capacity of the refrigerant pump 432 is increased, and the opening degree of the second control valve 431 is increased, so as to increase the liquid level of the liquid supply tank 4; so that the liquid level of the liquid supply tank 4 reaches the normal liquid level. When the liquid level detected by the liquid level detection member 42 is greater than the second set liquid level, the delivery capacity of the refrigerant pump 432 is reduced, and the opening degree of the second control valve 431 is reduced, so as to reduce the liquid level of the liquid supply tank 4; so that the liquid level of the liquid supply tank 4 reaches the normal liquid level.

[0086] When the pressure difference between the pressure value detected by the second pressure detection member 21 and the pressure value detected by the first pressure detection member 11 is greater than the current suspension pressure difference after the compressor 1 is started, the first control valve 461 is opened, and the refrigerant pump 432 and the second control valve 431 are closed, so that the first liquid supply pipe 46 delivers refrigerant to the liquid supply tank 4;

[0087] When the liquid level detected by the liquid level detection member 42 is less than the first set liquid level after the compressor 1 is started, and the first control valve 461 is in the open state, and the refrigerant pump 432 and the second control valve 431 are in the closed state, the opening degree of the first control valve 461 is increased, so as to increase the liquid level of the liquid supply tank 4, so that the liquid level of the liquid supply tank 4 reaches the normal liquid level. When the liquid level detected by the liquid level detection member 42 is greater than the second set liquid level, the opening degree of the first control valve 461 is reduced, so that the liquid level of the liquid supply tank 4 reaches the normal liquid level.

[0088] The technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but the person skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. The person skilled in the art can make equivalent changes or replacements to the related technical features without deviating from the principles of the utility model, and the technical schemes after the changes or replacements will all fall within the protection scope of the utility model.

Claims

1. An air conditioning system, characterized by, The compressor (1) includes a gas suspension type, an outdoor heat exchanger, an indoor heat exchanger and a liquid supply tank (4), the second outlet of the liquid supply tank (4) is connected to the bearing inlet of the compressor (1), the indoor heat exchanger and the outdoor heat exchanger are connected by a first pipeline (22); The first pipeline (22) is connected to the liquid inlet of the liquid supply tank (4) through a first liquid supply pipe (46), and the first liquid supply pipe (46) is provided with a first control valve (461).

2. The air conditioning system of claim 1, wherein, The first pipeline (22) is also connected to the liquid inlet of the liquid supply tank (4) through a second liquid supply pipe (43), and the second liquid supply pipe (43) is provided with a second control valve (431) and a refrigerant pump (432); The second control valve (431) and the refrigerant pump (432) are used to control the flow of liquid supplement to the liquid supply tank (4).

3. The air conditioning system of claim 2, wherein, The refrigerant pump (432) is arranged upstream of the second control valve (431), and the second control valve (431) is connected to the first pipeline (22) through a first liquid supply pipe (46); The first control valve (461) is a one-way valve, which only allows the refrigerant to flow from the first pipeline (22) to the second control valve (431).

4. The air conditioning system of claim 3, wherein, A first pressure detection member (11) is arranged in the cavity of the compressor (1), and a second pressure detection member (21) is arranged in the high-pressure side heat exchanger; a liquid level detection member (42) is arranged on the liquid supply tank (4) to detect the liquid level of the liquid refrigerant in the liquid supply tank (4); After the compressor (1) is started, when the pressure difference between the pressure value detected by the second pressure detection member (21) and the pressure value detected by the first pressure detection member (11) is less than the current suspension pressure difference, the refrigerant pump (432) and the second control valve (431) are opened to make the refrigerant pump (432) deliver refrigerant to the liquid supply tank (4) through the second liquid supply pipe (43); and / or After the compressor (1) is started, and the refrigerant pump (432) and the second control valve (431) are in an open state, when the liquid level detected by the liquid level detection member (42) is less than a first set liquid level, the delivery capacity of the refrigerant pump (432) is increased, and the opening of the second control valve (431) is increased to increase the liquid level of the liquid supply tank (4); when the liquid level detected by the liquid level detection member (42) is greater than a second set liquid level, the delivery capacity of the refrigerant pump (432) is reduced, and the opening of the second control valve (431) is reduced to reduce the liquid level of the liquid supply tank (4); wherein the first set liquid level is lower than the second set liquid level; and / or When the pressure difference between the pressure value detected by the second pressure detecting member (21) and the pressure value detected by the first pressure detecting member (11) is greater than the current float pressure difference after the compressor (1) is started, the second control valve (431) is opened, and the refrigerant pump (432) is closed, so that the first liquid supply pipe (46) and the part of the second liquid supply pipe (43) downstream of the first liquid supply pipe (46) deliver refrigerant to the liquid supply tank (4); and / or When the liquid level detected by the liquid level detecting member (42) is less than the first set liquid level after the compressor (1) is started, the second control valve (431) is in an open state, and the refrigerant pump (432) is in a closed state, the opening degree of the second control valve (431) is increased to increase the liquid level of the liquid supply tank (4); when the liquid level detected by the liquid level detecting member (42) is greater than the second set liquid level, the opening degree of the second control valve (431) is decreased to decrease the liquid level of the liquid supply tank (4); wherein the first set liquid level is lower than the second set liquid level.

5. The air conditioning system of claim 1, wherein, The outdoor heat exchanger and the indoor heat exchanger are also connected by a second pipeline (23), the second pipeline (23) is connected to the liquid inlet of the liquid supply tank (4) through a second liquid supply pipe (43), and the second liquid supply pipe (43) is provided with a second control valve (431) and a refrigerant pump (432); The second control valve (431) and the refrigerant pump (432) are used to control the flow of liquid supplied to the liquid supply tank (4).

6. The air conditioning system of claim 2 or 5, wherein A first pressure detecting member (11) is arranged in the cavity of the compressor (1), and a second pressure detecting member (21) is arranged in the high-pressure side heat exchanger; a liquid level detecting member (42) is arranged on the liquid supply tank (4) to detect the liquid level of the liquid refrigerant in the liquid supply tank (4); When the pressure difference between the pressure value detected by the second pressure detecting member (21) and the pressure value detected by the first pressure detecting member (11) is less than the current float pressure difference after the compressor (1) is started, the first control valve (461) is closed, and the refrigerant pump (432) and the second control valve (431) are opened, so that the refrigerant pump (432) delivers refrigerant to the liquid supply tank (4) through the second liquid supply pipe (43); and / or When the liquid level detected by the liquid level detecting member (42) is less than the first set liquid level after the compressor (1) is started, the first control valve (461) is in a closed state, and the refrigerant pump (432) and the second control valve (431) are in an open state, the delivery capacity of the refrigerant pump (432) is increased, and the opening degree of the second control valve (431) is increased to increase the liquid level of the liquid supply tank (4); when the liquid level detected by the liquid level detecting member (42) is greater than the second set liquid level, the delivery capacity of the refrigerant pump (432) is decreased, and the opening degree of the second control valve (431) is decreased to decrease the liquid level of the liquid supply tank (4); wherein the first set liquid level is lower than the second set liquid level; and / or When the pressure difference between the pressure value detected by the second pressure detecting member (21) and the pressure value detected by the first pressure detecting member (11) is greater than the current float pressure difference after the compressor (1) is started, the first control valve (461) is opened, and the refrigerant pump (432) and the second control valve (431) are closed, so that the first liquid supply pipe (46) supplies refrigerant to the liquid supply tank (4); and / or When the first control valve (461) is in an open state, the refrigerant pump (432) and the second control valve (431) are in a closed state, and the liquid level detected by the liquid level detecting member (42) is less than a first set liquid level after the compressor (1) is started, the opening of the first control valve (461) is increased to increase the liquid level of the liquid supply tank (4); when the liquid level detected by the liquid level detecting member (42) is greater than a second set liquid level, the opening of the first control valve (461) is decreased; wherein the first set liquid level is lower than the second set liquid level.

7. The air conditioning system of claim 6, wherein, The liquid supply tank (4) is provided with an electric heater (41) for heating the refrigerant in the liquid supply tank (4); When starting and the liquid level detected by the liquid level detecting member (42) is not less than a first set liquid level, the electric heater (41) is turned on to heat the refrigerant in the liquid supply tank (4) to establish a float pressure difference.

8. The air conditioning system of claim 7, wherein, The second exhaust port of the liquid supply tank (4) is connected to the low-pressure side heat exchanger through a second exhaust pipe (45), and the second exhaust pipe (45) is provided with a fourth control valve (451); When the machine is stopped and the first control valve (461) and / or the second control valve (431) is opened, the fourth control valve (451) is opened; and / or When the compressor (1) is started, and the current float pressure difference is greater than a second set pressure, the fourth control valve (451) is opened.

9. The air conditioning system of any one of claims 2-5, wherein, Further comprising a filter (433) provided on the second liquid supply pipe (43) and located upstream of the refrigerant pump (432); and / or Further comprising a second check valve (434) provided on the second liquid supply pipe (43) and located downstream of the second control valve (431).

10. The air conditioning system of any one of claims 1-4, wherein, The first pipeline (22) is provided with a third control valve (221), and the third control valve (221) is located on the side of the first liquid supply pipe (46) close to the low-pressure side heat exchanger; when the compressor (1) is running, the third control valve (221) is closed.

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