Volume-variable liquid storage device, air conditioning system and control method of air conditioning system

Abstract

The invention provides a variable-volume liquid storage device, an air conditioning system and a control method of the air conditioning system, and the variable-volume liquid storage device comprises a refrigerant liquid storage tank which is provided with a liquid inlet and a liquid outlet and is internally provided with a flexible bag body with variable volume; the capsule body adjusting device comprises an adjusting cylinder body, a piston and a driving part, the driving part is in transmission connection with the piston so as to be used for driving the piston to slide in the adjusting cylinder body, and the adjusting cylinder body is communicated with the flexible capsule body through a communication port; according to different working parameters of the air conditioning system, the capsule adjusting device is suitable for utilizing the driving part to drive the piston to slide so as to adjust the flexible capsule to different volumes. According to the variable-volume liquid storage device, the air conditioning system and the control method of the variable-volume liquid storage device, the optimal refrigerant matching of the air conditioning system under various working conditions can be achieved, and meanwhile, when the electronic expansion valve acts to adjust the parameters of the evaporator, the variable-volume liquid storage device can be matched to adjust and make up the changes of the parameters of the condenser.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, and in particular to a variable capacity liquid storage device, an air conditioning system and a control method thereof. Background Art

[0002] The refrigerant demand of heat pump air-conditioning units under cooling and heating conditions varies greatly. Also, under heating conditions, high load and low load conditions, high ambient temperature and low ambient temperature conditions, high temperature outlet water and low temperature outlet water conditions, the refrigerant demand of heat pump units is also different. This is mainly limited by the influence of the refrigerant charge amount, and it is difficult to achieve both high capacity and high energy efficiency in all conditions.

[0003] The existing heat pump air conditioning system with a fixed refrigerant volume and an electronic expansion valve is difficult to achieve the best energy efficiency under variable operating conditions, and cannot adjust the parameters of a single heat exchanger. The operation of the electronic expansion valve will affect the two heat exchangers on both sides. Summary of the invention

[0004] The present invention provides a variable-volume liquid storage device, an air-conditioning system and a control method thereof, which are used to solve the defects in the prior art and achieve the following technical effects: achieving optimal refrigerant matching of the air-conditioning system under various working conditions; at the same time, when the electronic expansion valve is actuated to adjust the evaporator parameters, the variable-volume liquid storage device can cooperate with the adjustment to compensate for the changes in the condenser parameters.

[0005] A variable volume liquid storage device for an air conditioning system according to an embodiment of the first aspect of the present invention comprises:

[0006] A refrigerant liquid storage tank is formed with a liquid inlet and a liquid outlet, and a flexible bladder with a variable volume is arranged in the refrigerant liquid storage tank;

[0007] The bladder regulating device comprises an regulating cylinder, a piston and a driving member, wherein the driving member is drivingly connected with the piston to drive the piston to slide in the regulating cylinder, and the regulating cylinder is connected with the flexible bladder through a communication port;

[0008] According to different working parameters of the air conditioning system, the bladder adjustment device is suitable for utilizing the driving member to drive the piston to slide so as to adjust the flexible bladder to different volumes.

[0009] According to one embodiment of the present invention, a liquid chamber and a gas chamber are formed in the refrigerant storage tank, the gas chamber is connected to the outside of the refrigerant storage tank through a gas outlet, and the liquid chamber is connected to the liquid inlet and the liquid outlet respectively;

[0010] The liquid chamber and the gas chamber are connected via a vent hole. A movable float is provided in the liquid chamber. A block corresponding to the position of the vent hole is provided on the float. The block is suitable for opening or closing the vent hole as the float moves.

[0011] According to one embodiment of the present invention, the liquid chamber and the gas chamber are arranged in layers along the up-down direction and separated by a partition plate, and the partition plate is provided with the vent hole;

[0012] The partition plate is provided with a restraining rod group extending downwards, and the float is slidably mounted on the restraining rod group and is suitable for sliding in the up and down directions.

[0013] According to one embodiment of the present invention, the driving member is a stepper motor, and the stepper motor is drivingly connected to the piston via a worm gear structure, wherein the driving end of the stepper motor is drivingly connected to the worm gear, and the worm gear is drivingly connected to the piston.

[0014] An air conditioning system according to a second aspect of the present invention includes:

[0015] A variable volume liquid storage device for an air conditioning system as described in the first aspect of the embodiment of the present invention;

[0016] An indoor heat exchanger, an outdoor heat exchanger and an electronic expansion valve, wherein the variable capacity storage device is connected between the indoor heat exchanger and the electronic expansion valve through the liquid inlet and the liquid outlet.

[0017] According to a third aspect of the present invention, a control method for an air conditioning system based on the second aspect of the present invention comprises:

[0018] Obtaining operating parameters of the air conditioning system and / or environmental factors of the environment in which the air conditioning system is located;

[0019] According to the working parameters and / or the environmental factors, a signal is sent to control the driving member to drive the piston to move, so that the refrigerant storage tank releases or stores refrigerant.

[0020] According to one embodiment of the present invention, the step of obtaining the operating parameters of the air conditioning system includes:

[0021] Determining that the air conditioning system is in a cooling mode, obtaining an actual subcooling degree and a target subcooling degree of the outdoor heat exchanger, and an actual superheating degree and a target superheating degree of the indoor heat exchanger;

[0022] The step of sending a signal to control the driving member to drive the piston to move according to the working parameter specifically includes:

[0023] Determining that the air conditioning system is in cooling mode;

[0024] sending a signal for controlling the driving member to move the piston according to the actual superheat and the target superheat of the indoor heat exchanger;

[0025] According to the actual subcooling degree and the target subcooling degree of the outdoor heat exchanger, a signal for controlling the action of the electronic expansion valve in the air-conditioning system is sent.

[0026] According to an embodiment of the present invention, the step of issuing a signal for controlling the driving member to move the piston according to the actual superheat and the target superheat of the indoor heat exchanger specifically includes:

[0027] According to the fact that the actual superheat of the indoor heat exchanger is greater than the target superheat, a signal is sent to control the driving member to drive the piston to slide toward the connecting port, so that the volume of the flexible bladder increases and the refrigerant stored in the refrigerant storage tank is released into the heating cycle until the actual superheat is equal to the target superheat;

[0028] In response to the actual superheat of the indoor heat exchanger being less than its target superheat, a signal is sent to control the driving member to drive the piston to slide in a direction away from the connecting port, so that the volume of the flexible bladder is reduced and excess refrigerant is absorbed from the heating cycle into the refrigerant storage tank until the actual superheat is equal to the target superheat.

[0029] According to one embodiment of the present invention, the step of obtaining the operating parameters of the air conditioning system includes:

[0030] Determining that the air conditioning system is in a heating mode, obtaining an actual superheat and a target superheat of the outdoor heat exchanger, and an actual subcooling and a target subcooling of the indoor heat exchanger;

[0031] The step of sending a signal to control the driving member to drive the piston to move according to the working parameter specifically includes:

[0032] Determining that the air conditioning system is in a heating mode;

[0033] sending a signal for controlling the driving member to move the piston according to the actual subcooling degree and the target subcooling degree of the indoor heat exchanger;

[0034] According to the actual subcooling degree and the target subcooling degree of the outdoor heat exchanger, a signal for controlling the action of the electronic expansion valve in the air-conditioning system is sent.

[0035] According to an embodiment of the present invention, the step of issuing a signal for controlling the driving member to move the piston according to the actual subcooling degree and the target subcooling degree of the indoor heat exchanger specifically includes:

[0036] According to the fact that the actual subcooling degree of the indoor heat exchanger is less than the target subcooling degree, a signal is sent to control the driving member to drive the piston to slide toward the connecting port, so that the volume of the flexible bladder increases and the refrigerant stored in the refrigerant storage tank is released into the heating cycle until the actual subcooling degree is equal to the target subcooling degree;

[0037] When the actual subcooling degree of the indoor heat exchanger is greater than the target subcooling degree, a signal is sent to control the driving member to drive the piston to slide in a direction away from the connecting port, so that the volume of the flexible bladder is reduced and excess refrigerant is absorbed from the heating cycle into the refrigerant storage tank until the actual subcooling degree is equal to the target subcooling degree.

[0038] According to an embodiment of the present invention, the environmental factor includes a temperature difference between an internal and external environment, and the step of sending a signal to control the driving member to drive the piston to move according to the environmental factor specifically includes:

[0039] According to the temperature difference between the internal and external environments, a signal is sent to control the driving member to drive the piston to adjust the liquid storage amount of the refrigerant liquid storage tank;

[0040] The temperature difference between the internal and external environments is negatively correlated with the storage volume of the refrigerant storage tank.

[0041] According to an embodiment of the present invention, the operating parameter includes change information of the target operating parameter of the air conditioning system, and the step of issuing a signal to control the driving member to drive the piston to move according to the operating parameter specifically includes:

[0042] According to the change information of the target working parameter, a signal is sent to control the driving member to drive the piston to adjust the liquid storage amount of the refrigerant liquid storage tank;

[0043] The target operating parameter change information at least includes target operating mode switching information or target cooling / heating temperature change information of the air-conditioning system.

[0044] According to the variable volume liquid storage device of the air conditioning system, the air conditioning system and the control method thereof of the embodiment of the present invention, the storage and release of the refrigerant in the air conditioning system can be realized, thereby realizing the control of the total amount of refrigerant participating in the heat exchange cycle in the air conditioning system. Furthermore, the amount of refrigerant required by the system is calculated according to the parameters of the built-in temperature and pressure sensors of the heat pump air conditioner, and the operation of absorbing or releasing the refrigerant by the variable volume liquid storage device is realized to realize the best refrigerant matching of the air conditioning system under various working conditions. At the same time, when the electronic expansion valve is actuated to adjust the evaporator parameters, the variable volume liquid storage device can cooperate to adjust and compensate for the changes in the condenser parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a schematic structural diagram of the variable volume liquid storage device provided by the present invention;

[0047] Figure 2 is a structural schematic diagram of an air conditioning system provided by the present invention;

[0048] Figure 3 is a schematic diagram of the steps of the control method of the air conditioning system provided by the present invention;

[0049] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention.

[0050] Reference numerals:

[0051] 1. Refrigerant liquid storage tank; 11. Liquid chamber; 111. Liquid inlet; 112. Liquid outlet; 12. Gas chamber; 121. Gas outlet; 13. Partition plate; 131. Air vent; 14. Float; 141. Block; 15. Restraining rod group;

[0052] 2. Flexible capsule; 31. Adjusting cylinder; 311. Connecting port; 32. Piston; 33. Driving member; 34. Turbine; 35. Worm; 36. Driving gear; 37. Connecting pipe;

[0053] 01. Compressor; 02. Indoor heat exchanger; 03. Outdoor heat exchanger; 04. Four-way valve; 05. Electronic expansion valve. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] The following describes a variable volume liquid storage device for an air conditioning system, an air conditioning system, and a control method for an air conditioning system proposed by the present invention with reference to the accompanying drawings. The variable volume liquid storage device is applied to the air conditioning system and is installed between the electronic expansion valve 05 and the indoor heat exchanger 02, and its purpose is to cool the excess refrigerant in the heating system and release it at an appropriate time.

[0056] like Figure 1 As shown, the variable volume liquid storage device of the air conditioning system according to the first embodiment of the present invention comprises a refrigerant liquid storage tank 1 and a bladder adjustment device.

[0057] The refrigerant liquid storage tank 1 is formed with a liquid inlet 111 and a liquid outlet 112 , and a flexible bladder 2 with a variable volume is arranged in the refrigerant liquid storage tank 1 .

[0058] The bladder adjusting device comprises an adjusting cylinder 31 , a piston 32 and a driving member 33 . The driving member 33 is drivingly connected to the piston 32 to drive the piston 32 to slide in the adjusting cylinder 31 . The adjusting cylinder 31 is connected to the flexible bladder 2 through a connecting port 311 .

[0059] According to different working parameters of the air conditioning system, the bladder adjustment device is suitable for utilizing the driving member 33 to drive the piston 32 to slide so as to adjust the flexible bladder 2 to different volumes.

[0060] According to the variable volume liquid storage device of the air conditioning system of the embodiment of the present invention, its specific working process is as follows: the bladder adjustment device can adjust the volume of the flexible bladder 2, wherein the medium filled in the flexible bladder 2 and the adjustment cylinder 31 can be gas or liquid (such as lubricating oil). Specifically, when the driving member 33 drives the piston 32 to move in the direction away from the connecting port 311, the piston 32 fills the medium in the adjustment cylinder 31 into the flexible bladder 2, and the volume of the flexible bladder 2 increases. Correspondingly, since the volume of the refrigerant storage tank 1 is constant, when the volume of the flexible bladder 2 increases, the volume of the refrigerant that can be stored in the refrigerant storage tank 1 also decreases, that is, the storage amount of the refrigerant storage tank 1 decreases. At this time, the refrigerant stored in the refrigerant storage tank 1 will be squeezed out of the refrigerant storage tank 1 by the flexible bladder 2 through the liquid outlet 112. At this time, if the variable volume liquid storage device is installed in the air conditioning system, the liquid released in the variable volume liquid storage device will re-enter the heat exchange cycle process.

[0061] When the driving member 33 drives the piston 32 to move toward the connecting port 311, negative pressure is formed in the adjusting cylinder 31, and the medium in the flexible bladder 2 is sucked into the adjusting cylinder 31 under the action of negative pressure. The volume of the flexible bladder 2 is reduced, and correspondingly, the volume of the refrigerant that can be stored in the refrigerant storage tank 1 also increases, that is, the liquid storage amount of the refrigerant storage tank 1 increases. At this time, under the action of negative pressure, the refrigerant storage tank 1 sucks the refrigerant in the air-conditioning system into the interior from the liquid outlet 112, thereby realizing the storage of excess refrigerant in the air-conditioning system.

[0062] It can be understood that when the above-mentioned variable-volume liquid storage device is installed in an air-conditioning system, the variable-volume liquid storage device can store or release the refrigerant in the air-conditioning system. Specifically, when the air-conditioning system requires more refrigerant due to increased load, increased heating demand or cooling demand, the variable-volume liquid storage device uses the control of the driving component 33 to release the stored refrigerant to increase the total amount of refrigerant participating in the heat exchange cycle in the air-conditioning system; when the air-conditioning system does not need too much refrigerant due to reduced load, reduced heating demand or cooling demand, the variable-volume liquid storage device uses the control of the driving component 33 to suck the excess refrigerant in the air-conditioning system into the refrigerant storage tank 1 for storage.

[0063] In summary, the variable volume liquid storage device of the air conditioning system according to the embodiment of the present invention can realize the storage and release of the refrigerant in the air conditioning system, thereby realizing the control of the total amount of refrigerant participating in the heat exchange cycle in the air conditioning system. Furthermore, the amount of refrigerant required by the system is calculated according to the built-in temperature and pressure sensor parameters of the heat pump air conditioner, and the variable volume liquid storage device absorbs or releases the refrigerant to achieve the best refrigerant matching of the air conditioning system under various working conditions. At the same time, when the electronic expansion valve 05 operates to adjust the evaporator parameters, the variable volume liquid storage device can cooperate to adjust and compensate for the changes in the condenser parameters.

[0064] like Figure 1 As shown, according to some embodiments of the present invention, a liquid chamber 11 and a gas chamber 12 are formed in the refrigerant storage tank 1, the gas chamber 12 is connected to the outside of the refrigerant storage tank 1 through the gas outlet 121, and the liquid chamber 11 is respectively connected to the liquid inlet 111 and the liquid outlet 112.

[0065] The liquid chamber 11 and the gas chamber 12 are connected via a vent hole 131 . A movable float 14 is provided in the liquid chamber 11 . A block 141 corresponding to the position of the vent hole 131 is provided on the float 14 . The block 141 is suitable for opening or closing the vent hole 131 as the float 14 moves.

[0066] Furthermore, the liquid chamber 11 and the gas chamber 12 are arranged in layers along the up-down direction and separated by a partition plate 13 , and a vent hole 131 is provided on the partition plate 13 .

[0067] A restraining rod group 15 extending downward is provided on the partition plate 13 , and the float 14 is slidably mounted on the restraining rod group 15 and is suitable for sliding in the up-down direction.

[0068] In the above embodiment, the purpose of the gas chamber 12 is to store and release the gaseous refrigerant that may exist in the liquid chamber 11, so as to ensure that the liquid chamber 11 can always be kept full of liquid refrigerant. The specific working principle is as follows: when the liquid chamber 11 is full of liquid, the float 14 floats to the top under the action of buoyancy, and the block 141 is inserted into the vent 131 of the partition plate 13 to form a seal on the vent 131. When the liquid refrigerant in the liquid chamber 11 flashes out gas, the gas accumulates at the top of the liquid chamber 11. At this time, the liquid level continues to drop, and the buoyancy of the float 14 continues to decrease. When the difference between the gravity and the buoyancy of the float 14 is greater than the pressure acting on the block 141, the float 14 falls, and the block 141 separates from the vent 131. The gas enters the gas chamber 12 through the vent 131, and then returns to the compressor 01 through the outlet 121 to inhale. As the gas is discharged, the liquid level in the liquid chamber 11 rises, the float 14 floats again, and the block 141 is reinserted into the vent 131 to form a seal. This is repeated to maintain the liquid storage tank full of liquid.

[0069] like Figure 1 As shown, in some specific embodiments, the vent hole 131 can be a conical hole that is narrow at the top and wide at the bottom. Correspondingly, the blocking block 141 can be a conical pin that is narrow at the top and wide at the bottom. The conical pin fits in the conical hole to achieve a sealed separation between the gas chamber 12 and the liquid chamber 11.

[0070] Among them, in the above embodiment, the constraint rod group 15 plays a role in orienting the moving direction of the float 14, that is, the float 14 can only move along the lifting direction of the liquid (that is, in the up and down direction) under the constraint of the constraint rod group 15, thereby ensuring the accurate matching of the block 141 on the float 14 and the vent hole 131. However, it should be noted that the present invention can also use other constraint structures to realize the directional constraint on the moving direction of the float 14, and the present invention is not particularly limited here, as long as the constraint structure can ensure the movement of the float 14 in the up and down direction.

[0071] like Figure 1 As shown, according to some embodiments of the present invention, the driving member 33 can drive a rotating driving member 33 such as a motor, or can be a linear driving member 33 such as a cylinder or a cylinder, and the present invention does not make any special limitation here.

[0072] Furthermore, the driving member 33 realizes transmission connection with the piston 32 through a transmission assembly, wherein the transmission assembly can be selected according to the different driving members 33. Specifically, the transmission assembly can be a worm gear 35 structure, a screw nut structure or a gear transmission structure, etc. The present invention does not make special limitations here.

[0073] like Figure 1As shown, for example, the driving member 33 is a stepper motor, and the stepper motor is connected to the piston 32 through a turbine 34 and a worm 35 structure, wherein the driving end of the stepper motor is connected to the turbine 34, and the worm 35 is connected to the piston 32. Further, a driving gear 36 is provided on the driving end of the stepper motor, and the driving gear 36 is meshed with the turbine 34.

[0074] In this embodiment, a worm 35 is connected to the upper part of the piston 32, and a turbine 34 is installed on the worm 35. The internal thread of the turbine 34 cooperates with the external thread of the worm 35, and the external gear of the turbine 34 meshes with the driving gear 36. The driving gear 36 is driven by a stepper motor. When the stepper motor rotates clockwise, the turbine 34 is driven to rotate counterclockwise, the worm 35 moves downward, and the piston 32 moves downward; when the stepper motor rotates counterclockwise, the piston 32 moves upward.

[0075] like Figure 1 As shown, according to some embodiments of the present invention, the communication port 311 of the regulating cylinder 31 is connected to the flexible bladder 2 through a communication pipe 37 .

[0076] like Figure 2 As shown, the air-conditioning system according to the second aspect of the present invention includes the variable-capacity liquid storage device of the air-conditioning system described in the first aspect of the present invention, and also includes an indoor heat exchanger 02, an outdoor heat exchanger 03 and an electronic expansion valve 05. The variable-capacity storage device is connected between the indoor heat exchanger 02 and the electronic expansion valve 05 through a liquid inlet 111 and a liquid outlet 112.

[0077] According to the air conditioning system of the embodiment of the present invention, the storage and release of the refrigerant in the air conditioning system can be realized, thereby realizing the control of the total amount of refrigerant participating in the heat exchange cycle in the air conditioning system. Furthermore, the amount of refrigerant required by the system is calculated according to the parameters of the built-in temperature and pressure sensors of the heat pump air conditioner, and the operation of absorbing or releasing the refrigerant by the variable volume liquid storage device is realized to realize the best refrigerant matching of the air conditioning system under various working conditions. At the same time, when the electronic expansion valve 05 is actuated to adjust the evaporator parameters, the variable volume liquid storage device can cooperate to adjust and compensate for the changes in the condenser parameters.

[0078] like Figure 2 As shown, according to some embodiments of the present invention, the air outlet 121 of the refrigerant storage tank is connected to the air return port of the compressor 01, so that the gaseous refrigerant in the gas chamber 12 can flow back to the compressor 01 through the air outlet 121, thereby realizing the recycling of the gaseous refrigerant and avoiding the loss of the total amount of refrigerant.

[0079] The control method and control device of the air-conditioning system proposed in the present invention are described below with reference to the accompanying drawings. Among them, before the embodiment of the present invention is described in detail, the entire application scenario is first described. The control method, control device, electronic device and computer-readable storage medium of the air-conditioning in the embodiment of the present invention can be applied to the air-conditioning locally, and can also be applied to the cloud platform in the Internet field, or other types of cloud platforms in the Internet field, or can also be applied to third-party devices. Among them, the third-party device may include many different types such as mobile phones, tablet computers, notebooks, car computers and other smart terminals.

[0080] The following description only takes the control method applicable to air conditioners as an example. It should be understood that the control method of the embodiment of the present invention can also be applied to cloud platforms and third-party devices.

[0081] like Figure 3 As shown, according to the third aspect of the present invention, the control method of the air conditioning system based on the second aspect of the present invention comprises:

[0082] Step S1, obtaining operating parameters of the air conditioning system and / or environmental factors of the environment in which the air conditioning system is located;

[0083] Step S2, based on working parameters and / or environmental factors, a signal is sent to control the driving member 33 to drive the piston 32 to move. At this time, after receiving the signal from the controller, the driving member 33 opens and drives the piston 32 to move, so that the refrigerant storage tank 1 releases or stores refrigerant.

[0084] In the related art, when the heat pump air conditioning system is running under variable operating conditions, in order to adjust the parameters such as evaporation pressure, condensation pressure, suction superheat, etc., in addition to adjusting the speed of the compressor 01, it is mainly achieved by adjusting the opening of the electronic expansion valve 05. The two ends of the electronic expansion valve 05 are connected to the evaporator and the condenser respectively. As a result, when adjusting the parameters in the evaporator, it is inevitable to affect the condenser pressure. For example, if you want to increase the suction superheat, you need to close the electronic expansion valve 05, which will cause the condenser pressure to increase. Similarly, when adjusting the parameters on the condenser side, the evaporator is also affected. The main reason is that the amount of refrigerant filled in the refrigeration cycle system is constant, and the physical heat exchange area of ​​the evaporator and condenser is also constant. When the electronic expansion valve 05 is closed, the liquid level in the evaporator drops, the heat exchange area occupied by the gas increases, and the superheat increases. At the same time, the liquid is blocked in the condenser by the closed electronic expansion valve 05, which causes the liquid level in the condenser to increase, the heat exchange area of ​​the gas to decrease, and the condensation pressure to increase.

[0085] One valve is used to adjust the parameters on both sides. If the air-conditioning system is a fixed operating condition system, the perfect matching of refrigerant filling amount, evaporator, condenser, electronic expansion valve 05, etc. can be achieved through precise calculation. However, air-conditioning systems often operate under variable operating conditions, and most of them have both cooling and heating functions. The matching of all operating conditions is completed by one valve, and the problem of one gain and the other loss is inevitable.

[0086] In order to solve the technical problems in the above-mentioned related technologies, the present invention associates the electronic expansion valve 05 only with one side of the outdoor heat exchanger 03, and adjusts the other side through a variable volume liquid storage device, so that each working condition can be perfectly matched.

[0087] Specifically, in one embodiment of the present invention, the step of obtaining the operating parameters of the air conditioning system includes:

[0088] It is determined that the air conditioning system is in cooling mode, and the actual subcooling degree and target subcooling degree of the outdoor heat exchanger 03 and the actual superheating degree and target superheating degree of the indoor heat exchanger 02 are obtained.

[0089] Further, according to the working parameters, the step of sending a signal to control the driving member 33 to drive the piston 32 to move specifically includes:

[0090] Make sure the air conditioning system is in cooling mode;

[0091] According to the actual superheat and target superheat of the indoor heat exchanger 02, a signal is sent to control the driving member 33 to move the piston 32;

[0092] According to the actual subcooling degree and the target subcooling degree of the outdoor heat exchanger 03, a signal for controlling the operation of the electronic expansion valve 05 in the air-conditioning system is sent.

[0093] In this way, in the cooling mode, the method of the present invention controls the action of the electronic expansion valve 05 to ensure that the actual subcooling of the outdoor heat exchanger 03 is stabilized at the target subcooling, and controls the action of the variable volume liquid storage device to ensure that the actual superheat of the indoor heat exchanger 02 is stabilized at the target superheat, thereby ensuring that the indoor heat exchanger 02 and the outdoor heat exchanger 03 can operate according to the target working parameters at the same time.

[0094] For example, the indoor heat exchanger 02 is a tube heat exchanger, and the outdoor heat exchanger 03 is a fin heat exchanger. In summer cooling conditions, the tube heat exchanger becomes an evaporator and its target is to maintain the suction superheat of 2°C, and the fin heat exchanger becomes a condenser and its target is to maintain the liquid subcooling of 2°C.

[0095] When the suction superheat in the shell and tube heat exchanger is greater than 2°C, it means that the refrigerant liquid level in the shell and tube heat exchanger is too low. At this time, the variable volume liquid storage device releases liquid to increase the liquid level in the shell and tube heat exchanger and maintain the suction superheat at 2°C; when the suction superheat is less than 2°C, it means that the refrigerant liquid level in the shell and tube heat exchanger is too high, and the variable volume liquid storage device needs to absorb liquid. At this time, the electronic expansion valve 05 is still used to control the state of the fin heat exchanger to maintain the refrigerant liquid subcooling at 2°C.

[0096] Further, according to the actual superheat and the target superheat of the indoor heat exchanger 02, the step of sending a signal to control the driving member 33 to move the piston 32 specifically includes:

[0097] When the actual superheat of the indoor heat exchanger 02 is greater than the target superheat, a signal is sent to control the driving member 33 to drive the piston 32 to slide toward the connecting port 311, so that the volume of the flexible bladder 2 increases and the refrigerant stored in the refrigerant storage tank 1 is released into the heating cycle until the actual superheat is equal to the target superheat;

[0098] When the actual superheat of the indoor heat exchanger 02 is less than the target superheat, a signal is sent to control the drive member 33 to drive the piston 32 to slide in a direction away from the connecting port 311, so that the volume of the flexible bladder 2 is reduced and excess refrigerant is absorbed from the heating cycle into the refrigerant storage tank 1 until the actual superheat is equal to the target superheat.

[0099] Specifically, in another embodiment of the present invention, the step of obtaining the operating parameters of the air conditioning system includes:

[0100] It is determined that the air conditioning system is in the heating mode, and the actual superheat and target superheat of the outdoor heat exchanger 03 and the actual subcooling and target subcooling of the indoor heat exchanger 02 are obtained.

[0101] The step of sending a signal to control the driving member 33 to drive the piston 32 to move according to the working parameters specifically includes:

[0102] Make sure the air conditioning system is in cooling mode;

[0103] According to the actual subcooling degree and the target subcooling degree of the indoor heat exchanger 02, a signal is sent to control the driving member 33 to move the piston 32;

[0104] According to the actual subcooling degree and the target subcooling degree of the outdoor heat exchanger 03, a signal for controlling the operation of the electronic expansion valve 05 in the air-conditioning system is sent.

[0105] In this way, in the heating mode, the method of the present invention controls the action of the electronic expansion valve 05 to ensure that the actual superheat of the outdoor heat exchanger 03 is stabilized at the target superheat, and controls the action of the variable volume liquid storage device to ensure that the actual subcooling of the indoor heat exchanger 02 is stabilized at the target subcooling, thereby ensuring that the indoor heat exchanger 02 and the outdoor heat exchanger 03 can operate according to the target working parameters at the same time.

[0106] For example, the indoor heat exchanger 02 is a tube heat exchanger, and the outdoor heat exchanger 03 is a fin heat exchanger. Under winter heating conditions, the target superheat of the evaporator is set to 2°C. When the actual superheat is greater than 2°C, it means that the liquid level in the fin heat exchanger is low, and the electronic expansion valve 05 needs to be opened. When the actual superheat is less than 2°C, the electronic expansion valve 05 needs to be closed.

[0107] The variable volume liquid storage tank must always ensure that the liquid level in the shell and tube heat exchanger is at the lowest state and maintain the condensation subcooling at 2°C. When the actual subcooling is greater than 2°C, it means that the refrigerant liquid level in the shell and tube heat exchanger is high, and there is a hidden danger of high condensation pressure. At this time, the liquid storage tank needs to inhale refrigerant. When the actual subcooling is less than 2°C, it means that the liquid level in the shell and tube heat exchanger is too low, and there may be a risk of not being able to supply liquid to the electronic expansion valve 05 in time.

[0108] When the electronic expansion valve 05 is opened, the liquid level in the shell and tube heat exchanger drops. At this time, the refrigerant subcooling decreases and is less than 2°C. The variable volume liquid storage tank is activated to release the refrigerant, causing the refrigerant liquid level in the shell and tube heat exchanger to rise and maintain a subcooling of 2°C. When the electronic expansion valve 05 is closed, the refrigerant liquid level in the shell and tube heat exchanger rises and the subcooling is greater than 2°C. At this time, the variable volume liquid storage device absorbs liquid to maintain a subcooling of 2°C.

[0109] Further, according to the actual subcooling degree and the target subcooling degree of the indoor heat exchanger 02, the step of sending a signal to control the driving member 33 to move the piston 32 specifically includes:

[0110] When the actual subcooling degree of the indoor heat exchanger 02 is less than the target subcooling degree, a signal is sent to control the driving member 33 to drive the piston 32 to slide toward the connecting port 311, so that the volume of the flexible bladder 2 increases and the refrigerant stored in the refrigerant storage tank 1 is released into the heating cycle until the actual subcooling degree is equal to the target subcooling degree;

[0111] When the actual degree of subcooling of the indoor heat exchanger 02 is greater than the target degree of subcooling, a signal is sent to control the drive member 33 to drive the piston 32 to slide in a direction away from the connecting port 311, so that the volume of the flexible bladder 2 is reduced and excess refrigerant is absorbed from the heating cycle into the refrigerant storage tank 1 until the actual degree of subcooling is equal to the target degree of subcooling.

[0112] In the related technologies, the refrigerant demand of heat pump air-conditioning units under cooling and heating conditions varies greatly. Also, under heating conditions, high load and low load conditions, high ambient temperature and low ambient temperature conditions, high temperature outlet water and low temperature outlet water conditions, the refrigerant demand of heat pump units also varies. This is mainly limited by the influence of the refrigerant charge amount, and it is difficult to achieve both high capacity and high energy efficiency in all conditions.

[0113] In order to solve the technical defects existing in the above-mentioned related technologies, the control method of the present invention can also analyze the working parameters and / or environmental factors of the air-conditioning system, and use a variable volume liquid storage device to adjust the total amount of refrigerant circulating in the air-conditioning system, so that the total amount of refrigerant circulating in the air-conditioning system can meet the current air-conditioning operating conditions.

[0114] Specifically, in one embodiment of the present invention, the environmental factor includes the temperature difference between the internal and external environments. Then, according to the environmental factor, the step of sending a signal to control the driving member 33 to drive the piston 32 to move specifically includes:

[0115] According to the temperature difference between the internal and external environments, a signal is sent to control the driving member 33 to drive the piston 32 to move so as to adjust the liquid storage volume of the refrigerant liquid storage tank 1. The temperature difference between the internal and external environments is negatively correlated with the liquid storage volume of the refrigerant liquid storage tank 1.

[0116] For example, when it is detected that the temperature difference between the internal and external environments increases, the load of the air-conditioning system adjusted to the same target cooling / heating temperature increases. At this time, more refrigerant is needed in the air-conditioning system to participate in the heat exchange cycle to adapt to the high-load operation of the air-conditioning system. Therefore, the controller controls the action of the variable volume liquid storage device, that is, drives the stepper motor to push the piston 32 downward, so that the volume of the flexible bladder 2 increases, thereby releasing the refrigerant stored in the liquid storage device into the air-conditioning system to participate in the heat exchange cycle.

[0117] For another example, when it is detected that the temperature difference between the internal and external environments is reduced, the load of the air-conditioning system is adjusted to the same target cooling / heating temperature. At this time, the air-conditioning system does not need too much refrigerant to adapt to the small load operation of the air-conditioning system. Therefore, the controller controls the action of the variable volume liquid storage device, that is, drives the stepper motor to pull the piston 32 upward to reduce the volume of the flexible bladder 2, so that the liquid storage device absorbs excess refrigerant from the refrigerant participating in the heat exchange cycle in the air-conditioning system and stores it, thereby reducing the total amount of refrigerant participating in the heat exchange cycle in the air-conditioning system.

[0118] Specifically, in some other embodiments of the present invention, the operating parameters include change information of target operating parameters of the air conditioning system, and the step of sending a signal to control the driving member 33 to drive the piston 32 to move according to the operating parameters specifically includes:

[0119] According to the change information of the target working parameter, a signal is sent to control the driving member 33 to drive the piston 32 to move so as to adjust the storage amount of the refrigerant storage tank 1.

[0120] The target operating parameter change information includes at least target operating mode switching information or target cooling / heating temperature change information of the air-conditioning system.

[0121] In this embodiment, it can be understood that when the working mode of the air-conditioning system is switched, or when the target cooling / heating temperature of the air-conditioning system changes, the total amount of refrigerant required for the circulation in the air-conditioning system will change. At this time, the controller directly controls the variable-volume liquid storage device to release or store refrigerant in the air-conditioning system, thereby achieving adjustment of the total amount of refrigerant participating in the heat exchange cycle, thereby ensuring the rationality of the total amount of refrigerant participating in the heat exchange cycle under various working conditions.

[0122] For example, when the air conditioner switches from cooling mode to heating mode, the amount of refrigerant required for the air conditioning system to work is reduced, and the controller controls the variable volume liquid storage device to operate, that is, drives the stepper motor to pull the piston 32 upward to reduce the volume of the flexible bladder 2, so that the refrigerant liquid storage device absorbs excess refrigerant from the refrigerant participating in the heat exchange cycle in the air conditioning system and stores it, thereby reducing the total amount of refrigerant participating in the heat exchange cycle in the air conditioning system.

[0123] When the air conditioner switches from heating mode to cooling mode, the amount of refrigerant required for the air conditioning system to work increases. Therefore, the controller controls the operation of the variable volume liquid storage device, that is, drives the stepper motor to push the piston 32 downward to increase the volume of the flexible bladder 2, thereby releasing the refrigerant stored in the refrigerant liquid storage device into the air conditioning system to participate in the heat exchange cycle.

[0124] For another example, when the target cooling temperature of the air conditioner decreases or the target heating temperature increases, the total amount of refrigerant required for the air conditioning system to operate increases. Therefore, the controller controls the operation of the variable volume liquid storage device, that is, drives the stepper motor to push the piston 32 downward to increase the volume of the flexible bladder 2, thereby releasing the refrigerant stored in the refrigerant liquid storage device into the air conditioning system to participate in the heat exchange cycle.

[0125] When the target cooling temperature of the air conditioner increases or the target heating temperature decreases, the total amount of refrigerant required for the air conditioning system to work decreases, and the controller controls the variable volume liquid storage device to operate, that is, drives the stepper motor to pull the piston 32 upward to reduce the volume of the flexible bladder 2, so that the refrigerant liquid storage device absorbs excess refrigerant from the refrigerant participating in the heat exchange cycle in the air conditioning system and stores it, thereby reducing the total amount of refrigerant participating in the heat exchange cycle in the air conditioning system.

[0126] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the control method of the air conditioning system described above.

[0127] In addition, the logic instructions in the above-mentioned reservoir 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only storage device (ROM, Read-Only Memory), random access storage device (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0128] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the air-conditioning system described above.

[0129] On the other hand, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the control method of the air-conditioning system described above.

[0130] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0131] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A variable volume liquid storage device for an air conditioning system, characterized in that: include: A refrigerant liquid storage tank is formed with a liquid inlet and a liquid outlet, and a flexible bladder with a variable volume is arranged in the refrigerant liquid storage tank; The bladder regulating device comprises an regulating cylinder, a piston and a driving member, wherein the driving member is drivingly connected with the piston to drive the piston to slide in the regulating cylinder, and the regulating cylinder is connected with the flexible bladder through a communication port; According to different working parameters of the air-conditioning system, the bladder adjustment device is suitable for utilizing the driving member to drive the piston to slide so as to adjust the flexible bladder to different volumes.

2. The variable volume liquid storage device for an air conditioning system according to claim 1, characterized in that: A liquid chamber and a gas chamber are formed in the refrigerant storage tank, the gas chamber is connected to the outside of the refrigerant storage tank through an air outlet, and the liquid chamber is connected to the liquid inlet and the liquid outlet respectively; The liquid chamber and the gas chamber are connected via a vent hole. A movable float is provided in the liquid chamber. A block corresponding to the position of the vent hole is provided on the float. The block is suitable for opening or closing the vent hole as the float moves.

3. The variable volume liquid storage device for an air conditioning system according to claim 2, characterized in that: The liquid chamber and the gas chamber are arranged in layers along the up-down direction and separated by a partition plate, and the partition plate is provided with the vent hole; The partition plate is provided with a restraining rod group extending downwards, and the float is slidably mounted on the restraining rod group and is suitable for sliding in the up and down directions.

4. The variable volume liquid storage device of the air conditioning system according to any one of claims 1 to 3, characterized in that: The driving member is a stepper motor, and the stepper motor is drivingly connected to the piston via a worm gear structure, wherein the driving end of the stepper motor is drivingly connected to the worm gear, and the worm gear is drivingly connected to the piston.

5. An air conditioning system, characterized in that: include: A variable volume liquid storage device for an air conditioning system according to any one of claims 1 to 4; An indoor heat exchanger, an outdoor heat exchanger and an electronic expansion valve, wherein the variable capacity storage device is connected between the indoor heat exchanger and the electronic expansion valve through the liquid inlet and the liquid outlet.

6. A control method for an air conditioning system according to claim 5, characterized in that: include: Obtaining operating parameters of the air conditioning system and / or environmental factors of the environment in which the air conditioning system is located; According to the working parameters and / or the environmental factors, a signal is sent to control the driving member to drive the piston to move, so that the refrigerant storage tank releases or stores refrigerant.

7. The control method of the air conditioning system according to claim 6, characterized in that: The step of obtaining the working parameters of the air conditioning system comprises: Determining that the air conditioning system is in a cooling mode, obtaining an actual subcooling degree and a target subcooling degree of the outdoor heat exchanger, and an actual superheating degree and a target superheating degree of the indoor heat exchanger; The step of sending a signal to control the driving member to drive the piston to move according to the working parameter specifically includes: Determining that the air conditioning system is in cooling mode; sending a signal for controlling the driving member to move the piston according to the actual superheat and the target superheat of the indoor heat exchanger; According to the actual subcooling degree and the target subcooling degree of the outdoor heat exchanger, a signal for controlling the action of the electronic expansion valve in the air-conditioning system is sent.

8. The control method of the air conditioning system according to claim 7, characterized in that: The step of sending a signal for controlling the driving member to move the piston according to the actual superheat and the target superheat of the indoor heat exchanger specifically includes: According to the fact that the actual superheat of the indoor heat exchanger is greater than the target superheat, a signal is sent to control the driving member to drive the piston to slide toward the connecting port, so that the volume of the flexible bladder increases and the refrigerant stored in the refrigerant storage tank is released into the heating cycle until the actual superheat is equal to the target superheat; In response to the actual superheat of the indoor heat exchanger being less than its target superheat, a signal is sent to control the driving member to drive the piston to slide in a direction away from the connecting port, so that the volume of the flexible bladder is reduced and excess refrigerant is absorbed from the heating cycle into the refrigerant storage tank until the actual superheat is equal to the target superheat.

9. The control method of the air conditioning system according to claim 6, characterized in that: The step of obtaining the working parameters of the air conditioning system comprises: Determining that the air conditioning system is in a heating mode, obtaining an actual superheat and a target superheat of the outdoor heat exchanger, and an actual subcooling and a target subcooling of the indoor heat exchanger; The step of sending a signal to control the driving member to drive the piston to move according to the working parameter specifically includes: Determining that the air conditioning system is in a heating mode; sending a signal for controlling the driving member to move the piston according to the actual subcooling degree and the target subcooling degree of the indoor heat exchanger; According to the actual subcooling degree and the target subcooling degree of the outdoor heat exchanger, a signal for controlling the action of the electronic expansion valve in the air-conditioning system is sent.

10. The control method of the air conditioning system according to claim 9, characterized in that: The step of sending a signal for controlling the driving member to move the piston according to the actual subcooling degree and the target subcooling degree of the indoor heat exchanger specifically includes: According to the fact that the actual subcooling degree of the indoor heat exchanger is less than the target subcooling degree, a signal is sent to control the driving member to drive the piston to slide toward the connecting port, so that the volume of the flexible bladder increases and the refrigerant stored in the refrigerant storage tank is released into the heating cycle until the actual subcooling degree is equal to the target subcooling degree; When the actual subcooling degree of the indoor heat exchanger is greater than the target subcooling degree, a signal is sent to control the driving member to drive the piston to slide in a direction away from the connecting port, so that the volume of the flexible bladder is reduced and excess refrigerant is absorbed from the heating cycle into the refrigerant storage tank until the actual subcooling degree is equal to the target subcooling degree.

11. The control method of the air conditioning system according to any one of claims 6 to 10, characterized in that: The environmental factor includes the temperature difference between the internal and external environments. Then, the step of sending a signal to control the driving member to drive the piston to move according to the environmental factor specifically includes: According to the temperature difference between the internal and external environments, a signal is sent to control the driving member to drive the piston to adjust the liquid storage amount of the refrigerant liquid storage tank; The temperature difference between the internal and external environments is negatively correlated with the storage volume of the refrigerant storage tank.

12. The control method of the air conditioning system according to any one of claims 6 to 10, characterized in that: The operating parameter includes change information of the target operating parameter of the air conditioning system, and the step of sending a signal to control the driving member to drive the piston to move according to the operating parameter specifically includes: According to the change information of the target working parameter, a signal is sent to control the driving member to drive the piston to adjust the liquid storage amount of the refrigerant liquid storage tank; The target operating parameter change information at least includes target operating mode switching information or target cooling / heating temperature change information of the air-conditioning system.

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