Variable-volume liquid storage device, air conditioning system and control method thereof

Abstract

The application provides a variable-volume liquid storage device, an air conditioning system and a control method thereof. The variable-volume liquid storage device comprises: a refrigerant storage tank, which is formed with a liquid inlet and a liquid outlet, and a flexible capsule with a variable volume arranged in the refrigerant storage tank; and a capsule adjusting device, which comprises an adjusting cylinder, a piston and a driving member. The driving member is in transmission connection with the piston to drive the piston to slide in the adjusting cylinder. The adjusting cylinder is in communication with the flexible capsule through a communication port. According to different working parameters of the air conditioning system, the capsule adjusting device is adapted to drive the piston to slide by using the driving member to adjust the flexible capsule to different volumes. The variable-volume liquid storage device, the air conditioning system and the control method thereof can realize the optimal refrigerant matching of the air conditioning system under various working conditions. Meanwhile, when the electronic expansion valve is actuated to adjust the evaporator parameters, the variable-volume liquid storage device can be adjusted to compensate for the change of the condenser parameters.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical appliances, in particular to a variable-capacity liquid storage device, an air conditioning system and a control method thereof. BACKGROUND

[0002] The heat pump air conditioning unit has a large difference in refrigerant demand between the refrigeration and heating conditions. In addition, under the heating condition, the heat pump unit also has different refrigerant demands under large and small load conditions, high and low ambient temperature conditions, and high and low temperature water outlet conditions, which are mainly limited by the refrigerant charge amount, making it difficult to achieve high capacity and high energy efficiency under various conditions.

[0003] The existing fixed refrigerant amount and single electronic expansion valve heat pump air conditioning system cannot achieve optimal energy efficiency under variable operating conditions, and cannot adjust the parameters of a single heat exchanger. The action of the electronic expansion valve will affect both sides of the two heat exchangers. SUMMARY

[0004] The present application provides a variable-capacity liquid storage device, an air conditioning system and a control method thereof to solve the defects in the prior art and achieve the following technical effects: the air conditioning system achieves optimal refrigerant matching under various conditions, and when the electronic expansion valve adjusts the evaporator parameters, the variable-capacity liquid storage device can adjust and compensate for changes in the condenser parameters.

[0005] The variable-capacity liquid storage device of the air conditioning system according to the first aspect of the present application comprises:

[0006] A refrigerant storage tank is formed with an inlet and an outlet, and a flexible bladder with variable volume is arranged inside the refrigerant storage tank.

[0007] A bladder adjusting device comprises an adjusting cylinder, a piston and a driving member, the driving member is in transmission connection with the piston for driving the piston to slide in the adjusting cylinder, and the adjusting cylinder is in communication with the flexible bladder through a communication port.

[0008] According to different working parameters of the air conditioning system, the bladder adjusting device is adapted to drive the piston to slide by using the driving member to adjust the flexible bladder to different volumes.

[0009] According to an embodiment of the present application, a liquid chamber and a gas chamber are formed in the refrigerant storage tank, the gas chamber is communicated to the outside of the refrigerant storage tank through a gas outlet, and the liquid chamber is respectively communicated with the inlet and the outlet.

[0010] The liquid chamber and the gas chamber are communicated through a vent hole, a movable float is arranged in the liquid chamber, and a block corresponding to the position of the vent hole is arranged on the float, and the block is adapted to open or close the vent hole with the movement of the float.

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

[0012] The partition plate is provided with a set of downward extending constraint rods, and the float is slidably mounted on the set of constraint rods and is adapted to slide along the up-down direction.

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

[0014] The air conditioning system according to the second aspect of the present application comprises:

[0015] The variable-capacity storage device of the air conditioning system according to the first aspect of the present application;

[0016] 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] The control method according to the third aspect of the present application based on the air conditioning system according to the second aspect of the present application comprises:

[0018] Obtaining the working 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 act, so that the refrigerant storage tank releases or stores refrigerant.

[0020] According to one embodiment of the present application, the step of obtaining the working parameters of the air conditioning system comprises:

[0021] Determining that the air conditioning system is in a cooling mode, obtaining the actual supercooling degree and the target supercooling degree of the outdoor heat exchanger, and the actual superheating degree and the 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 act according to the working parameters specifically comprises:

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

[0024] According to the actual superheat degree of the indoor heat exchanger and the target superheat degree, a signal is sent to control the action of the driving member to the piston;

[0025] According to the actual supercooling degree of the indoor heat exchanger and the target supercooling degree, a signal is sent to control the action of the electronic expansion valve in the air conditioning system.

[0026] According to an embodiment of the present application, the step of sending a signal to control the action of the driving member to the piston according to the actual superheat degree of the indoor heat exchanger and the target superheat degree specifically comprises:

[0027] According to the actual superheat degree of the indoor heat exchanger being greater than the target superheat degree, a signal is sent to control the driving member to drive the piston to slide towards the direction close to the communication port, so that the volume of the flexible capsule increases and the refrigerant stored in the refrigerant storage tank is released into the heating cycle until the actual superheat degree is equal to the target superheat degree.

[0028] According to the actual superheat degree of the indoor heat exchanger being less than the target superheat degree, a signal is sent to control the driving member to drive the piston to slide away from the direction away from the communication port, so that the volume of the flexible capsule decreases and the excess refrigerant is absorbed from the heating cycle into the refrigerant storage tank until the actual superheat degree is equal to the target superheat degree.

[0029] According to an embodiment of the present application, the step of obtaining the working parameters of the air conditioning system comprises:

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

[0031] The step of sending a signal to control the action of the driving member to the piston according to the working parameters specifically comprises:

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

[0033] According to the actual supercooling degree of the indoor heat exchanger and the target supercooling degree, a signal is sent to control the action of the driving member to the piston;

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

[0035] According to an embodiment of the present application, the step of sending a signal to control the action of the driving member to the piston according to the actual supercooling degree of the indoor heat exchanger and the target supercooling degree specifically comprises:

[0036] According to the actual supercooling degree of the indoor heat exchanger being less than the target supercooling degree, a signal is sent to control the driving member to drive the piston to slide towards the communicating port, so that the volume of the flexible bag is increased and the refrigerant stored in the refrigerant storage tank is released into the heating cycle until the actual supercooling degree is equal to the target supercooling degree.

[0037] According to the actual supercooling degree of the indoor heat exchanger being greater than the target supercooling degree, a signal is sent to control the driving member to drive the piston to slide away from the communicating port, so that the volume of the flexible bag is decreased and the excess refrigerant is absorbed from the heating cycle into the refrigerant storage tank until the actual supercooling degree is equal to the target supercooling degree.

[0038] According to an embodiment of the present application, the environmental factor includes an indoor-outdoor temperature difference between an indoor environment and an outdoor environment, and the step of sending a signal to control the driving member to drive the piston according to the environmental factor specifically includes:

[0039] sending a signal to control the driving member to drive the piston according to the indoor-outdoor temperature difference to adjust the storage amount of the refrigerant storage tank;

[0040] wherein the indoor-outdoor temperature difference is negatively correlated with the storage amount of the refrigerant storage tank.

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

[0042] sending a signal to control the driving member to drive the piston according to the change information of the target working parameter to adjust the storage amount of the refrigerant storage tank;

[0043] wherein the change information of the target working parameter at least includes switching information of a target working mode of the air conditioning system or change information of a target refrigeration / heating temperature.

[0044] The variable-volume liquid storage device of the air conditioning system, the air conditioning system and the control method thereof according to the embodiments of the present application can realize the storage and release of the refrigerant in the air conditioning system, so as to control the total refrigerant amount participating in the heat exchange cycle in the air conditioning system, further, calculate the refrigerant amount required by the air conditioning system according to the built-in temperature and pressure sensor parameter calculation system, and realize the optimal refrigerant matching of the air conditioning system under various working conditions by the operation of absorbing or releasing the refrigerant by the variable-volume liquid storage device. Meanwhile, when the electronic expansion valve is adjusted to adjust the evaporator parameter, the variable-volume liquid storage device can be adjusted to compensate for the change of the condenser parameter. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0046] Figure 1 is a structural schematic diagram of the variable-capacity liquid storage device provided by the present application;

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

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

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

[0050] Reference signs:

[0051] 1, refrigerant storage tank; 11, liquid chamber; 111, liquid inlet; 112, liquid outlet; 12, gas chamber; 121, gas outlet; 13, partition plate; 131, air hole; 14, float; 141, plug; 15, constraint rod group;

[0052] 2, flexible bag body; 31, adjusting cylinder; 311, communication port; 32, piston; 33, driving member; 34, turbine; 35, worm; 36, driving gear; 37, communication pipeline;

[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 solutions and advantages of the present application more clear, the technical solutions in the present application will be described clearly and completely below by combining the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0055] The following will introduce a variable-capacity liquid storage device, an air conditioning system and a control method of the air conditioning system provided by the present application by referring to the drawings. The variable-capacity 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 the purpose is to store the excess refrigerant in the refrigeration and heating system and release at the appropriate time.

[0056] As Figure 1 shown in the figure, the variable-volume liquid storage device of the air conditioning system according to the embodiment of the first aspect of the present application comprises a refrigerant storage tank 1 and a bladder adjusting device.

[0057] The refrigerant storage tank 1 is formed with an inlet 111 and an outlet 112, and a flexible bladder 2 with variable volume is arranged in the refrigerant 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 in transmission connection with the piston 32 for driving the piston 32 to slide in the adjusting cylinder 31, and the adjusting cylinder 31 is in communication with the flexible bladder 2 through a communication port 311.

[0059] According to different working parameters of the air conditioning system, the bladder adjusting device is adapted to drive the piston 32 to slide by the driving member 33 to adjust the flexible bladder 2 to different volumes.

[0060] The variable-volume liquid storage device of the air conditioning system according to the embodiment of the present application has the following specific working process: the bladder adjusting device can adjust the volume of the flexible bladder 2, wherein the medium filled in the flexible bladder 2 and the adjusting cylinder 31 can be gas or liquid (such as lubricating oil), specifically, when the driving member 33 drives the piston 32 to move towards the direction away from the communication port 311, the piston 32 fills the medium in the adjusting cylinder 31 into the flexible bladder 2, 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 storage tank 1 that can store the refrigerant also decreases, that is, the liquid 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 outlet 112, at this time, if the variable-volume liquid storage device is installed in the air conditioning system, the liquid discharged from the variable-volume liquid storage device will re-enter the heat exchange cycle.

[0061] When the driving member 33 drives the piston 32 to move towards the direction close to the communication port 311, a 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 the negative pressure, the volume of the flexible bladder 2 decreases, correspondingly, the volume of the refrigerant storage tank 1 that can store the refrigerant also increases, that is, the liquid storage amount of the refrigerant storage tank 1 increases, at this time, under the action of the negative pressure, the refrigerant in the air conditioning system is sucked into the refrigerant storage tank 1 from the outlet 112, thereby realizing the storage of the excess refrigerant in the air conditioning system.

[0062] It is understandable that when the aforementioned variable capacity liquid storage device is installed in the air conditioning system, the variable capacity 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, heating demand, or cooling demand, the variable capacity liquid storage device releases the stored refrigerant by controlling the drive component 33 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 require much refrigerant due to decreased load, reduced heating demand, or cooling demand, the variable capacity liquid storage device draws the excess refrigerant in the air conditioning system into the refrigerant storage tank 1 for storage by controlling the drive component 33.

[0063] In summary, the variable-capacity liquid storage device of the air conditioning system according to embodiments of the present invention can realize the storage and release of refrigerant within the air conditioning system, thereby controlling the total amount of refrigerant participating in the heat exchange cycle within the air conditioning system. Furthermore, by calculating the required amount of refrigerant based on the parameters of the built-in temperature and pressure sensors of the heat pump air conditioner, and through the operation of absorbing or releasing refrigerant via the variable-capacity liquid storage device, optimal refrigerant matching of the air conditioning system under various operating conditions can be achieved. Simultaneously, when the electronic expansion valve 05 actuates to adjust the evaporator parameters, the variable-capacity liquid storage device can cooperate in adjusting and compensating for 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 inside 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 connected to the liquid inlet 111 and the liquid outlet 112 respectively.

[0065] The liquid chamber 11 and the gas chamber 12 are connected by a vent 131. The liquid chamber 11 is provided with a movable float 14. The float 14 is provided with a block 141 corresponding to the position of the vent 131. The block 141 is adapted to open or close the vent 131 as the float 14 moves.

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

[0067] The partition plate 13 is provided with a downwardly extending constraint rod assembly 15, and the float 14 is slidably mounted on the constraint rod assembly 15 and is adapted to slide in the vertical direction.

[0068] In the above embodiment, the gas chamber 12 is used to store and release the gaseous refrigerant possibly existing in the liquid chamber 11, so as to ensure that the liquid chamber 11 can always keep the full-liquid state of the liquid refrigerant, and the specific working principle is as follows: when the liquid chamber 11 is full of liquid, the float 14 floats to the top end under the action of the buoyancy, and the blocking block 141 is inserted into the air hole 131 of the partition plate 13 to seal the air hole 131; when the liquid refrigerant in the liquid chamber 11 flashes into gas, the gas accumulates at the top end of the liquid chamber 11, at this time, the liquid level is continuously lowered, and the buoyancy acting on the float 14 is also continuously reduced; when the difference between the gravity of the float 14 and the buoyancy is greater than the pressure acting on the blocking block 141, the float 14 falls, the blocking block 141 is separated from the air hole 131, and the gas enters the gas chamber 12 through the air hole 131, and then returns to the compressor 01 for suction through the gas outlet 121; with the discharge of the gas, the liquid level in the liquid chamber 11 rises, the float 14 floats again, and the blocking block 141 is inserted into the air hole 131 again to form a seal, so as to maintain the full-liquid state of the liquid storage tank.

[0069] As shown in the figure, Figure 1 In some specific embodiments, the air hole 131 can be a tapered hole with a narrow upper part and a wide lower part, and correspondingly, the blocking block 141 can be a conical needle with a narrow upper part and a wide lower part, which is matched in the tapered hole to realize the sealing separation between the gas chamber 12 and the liquid chamber 11.

[0070] 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 in the lifting and lowering direction of the liquid (i.e. the up and down direction) under the constraint of the constraint rod group 15, so as to ensure the accurate matching of the blocking block 141 on the float 14 and the air hole 131. However, it should be noted that the present application can also use other constraint structures to realize the directional constraint of the moving direction of the float 14, and the present application does not make special limitation here, as long as the constraint structure can ensure the movement of the float 14 in the up and down direction.

[0071] As shown in the figure, Figure 1 According to some embodiments of the present application, the driving member 33 can drive the motor and other rotating driving members 33, or can be a gas cylinder or a linear driving member 33, and the present application does not make special limitation here.

[0072] Further, the driving member 33 is connected with the piston 32 through a transmission assembly, and the transmission assembly can be selected according to the driving member 33, and specifically, the transmission assembly can be a worm gear 35 structure, a screw nut structure or a gear transmission structure, and the present application does not make special limitation here.

[0073] As shown in the figure, Figure 1As shown, for example, the driving member 33 is a stepper motor, which is drivingly connected with the piston 32 through a worm 34 worm 35 structure, wherein the driving end of the stepper motor is drivingly connected with the worm 34, and the worm 35 is drivingly connected with the piston 32. Further, the driving end of the stepper motor is provided with a driving gear 36, which is engaged with the worm 34.

[0074] In the present embodiment, the piston 32 is connected with the worm 35 at the upper portion, the worm 35 is provided with the worm 34, the inner thread of the worm 34 is matched with the outer thread of the worm 35, the external gear of the worm 34 is engaged with the driving gear 36, and the driving gear 36 is driven by the stepper motor. When the stepper motor rotates clockwise, the worm 34 rotates counterclockwise, the worm 35 moves downward, and the piston 32 moves downward; when the stepper motor rotates counterclockwise, the piston 32 moves upward.

[0075] As shown, Figure 1 According to some embodiments of the present application, the communication port 311 of the adjusting cylinder 31 is connected with the flexible bag 2 through a communication pipeline 37.

[0076] As shown, Figure 2 According to the air conditioning system of the second aspect of the present application, the variable capacity storage device is connected between the indoor heat exchanger 02 and the electronic expansion valve 05 through the liquid inlet 111 and the liquid outlet 112.

[0077] According to the air conditioning system of the present application, the storage and discharge of the refrigerant in the air conditioning system can be realized, so that the total cold energy amount participating in the heat exchange cycle in the air conditioning system can be controlled. Further, the refrigerant amount required by the air conditioning system is calculated according to the built-in temperature and pressure sensor parameters of the heat pump air conditioner, and the refrigerant is absorbed or discharged through the operation of the variable capacity storage device, so that the optimal refrigerant matching of the air conditioning system under various working conditions can be realized. At the same time, when the electronic expansion valve 05 adjusts the evaporator parameters, the variable capacity storage device can be adjusted to compensate for the change of the condenser parameters.

[0078] As shown, Figure 2 According to some embodiments of the present application, the gas outlet 121 of the refrigerant storage device is communicated to the return gas port of the compressor 01, so that the gaseous refrigerant in the gas chamber 12 can flow back to the compressor 01 through the gas 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 according to the present application are described below with reference to the accompanying drawings. Before the embodiments of the present application are described in detail, the entire application scenario is described first. The control method and control device of the air conditioning system, electronic equipment and computer readable storage medium according to the embodiments of the present application can be applied to the air conditioning system locally, the cloud platform in the Internet field, or the cloud platform in other types of Internet field, or a third-party device. The third-party device can include a mobile phone, a tablet computer, a notebook computer, a vehicle-mounted computer and other smart terminals, etc.

[0080] The control method according to the present application is described below by taking the air conditioning system as an example. It should be understood that the control method according to the embodiments of the present application can also be applied to the cloud platform and the third-party device.

[0081] As shown in Figure 3 According to the control method of the air conditioning system according to the third aspect of the present application, the control method is described in the second aspect of the present application, which comprises:

[0082] In step S1, the working parameters of the air conditioning system and / or the environmental factors of the environment where the air conditioning system is located are obtained.

[0083] In step S2, according to the working parameters and / or the environmental factors, a signal for driving the driving member 33 to drive the piston 32 to act is sent. At this time, the driving member 33 is opened and drives the piston 32 to act after receiving the signal of the controller, so that the refrigerant storage tank 1 releases or stores the refrigerant.

[0084] In the related art, when the heat pump air conditioning system is operated under variable conditions, in order to adjust the parameters such as evaporation pressure, condensation pressure and suction superheat, in addition to adjusting the speed of the compressor 01, the opening of the electronic expansion valve 05 is mainly adjusted. The electronic expansion valve 05 is connected to the evaporator and the condenser at both ends, so that when adjusting the parameters in the evaporator, the condenser pressure will be inevitably affected. For example, if the suction superheat is increased, the electronic expansion valve 05 will be closed, which will cause the condenser pressure to rise. Similarly, when adjusting the parameters on the condenser side, the evaporator will also be 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 the condenser is also constant. When the electronic expansion valve 05 is closed, the liquid level in the evaporator decreases, 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 rise and the heat exchange area of the gas to decrease, thereby increasing the condensation pressure.

[0085] One valve is used to adjust the parameters on both sides, if the air conditioning system is a constant working condition system, through accurate calculation, the perfect matching of refrigerant charging amount, evaporator, condenser, electronic expansion valve 05, etc. can be realized, but the air conditioning system is often operated in variable working condition, and most of them have refrigeration and heating functions at the same time, and through one valve to complete the matching of all working conditions, the problem of mutual elimination is inevitable.

[0086] To solve the technical problems in the related art, the electronic expansion valve 05 is only associated with one side of the outdoor heat exchanger 03, and the other side is adjusted by the variable volume liquid storage device, so that perfect matching can be realized in each working condition.

[0087] Specifically, in one embodiment of the present application, the step of obtaining the working parameters of the air conditioning system comprises:

[0088] Determine that the air conditioning system is in a refrigeration mode, obtain the actual supercooling degree and the target supercooling degree of the outdoor heat exchanger 03, and the actual superheating degree and the target superheating degree of the indoor heat exchanger 02.

[0089] Further, according to the working parameters, the step of issuing a signal to control the drive member 33 to drive the piston 32 to act includes:

[0090] Determine that the air conditioning system is in a refrigeration mode;

[0091] According to the actual superheating degree and the target superheating degree of the indoor heat exchanger 02, a signal is issued to control the drive member 33 to act on the piston 32;

[0092] According to the actual supercooling degree and the target supercooling degree of the outdoor heat exchanger 03, a signal is issued to control the electronic expansion valve 05 in the air conditioning system to act.

[0093] In this way, in the refrigeration mode, the method of the present application controls the electronic expansion valve 05 to act to ensure that the actual supercooling degree of the outdoor heat exchanger 03 is stable at the target supercooling degree, and controls the variable volume liquid storage device to act to ensure that the actual superheating degree of the indoor heat exchanger 02 is stable at the target superheating degree, 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 double-pipe heat exchanger, and the outdoor heat exchanger 03 is a fin heat exchanger. In the summer refrigeration working condition, the double-pipe heat exchanger becomes an evaporator and its target is to maintain the suction superheating degree of 2℃, and the fin heat exchanger becomes a condenser and its target is to maintain the liquid supercooling degree of 2℃.

[0095] When the suction superheat in the tube heat exchanger is greater than 2℃, it indicates that the refrigerant level in the tube heat exchanger is too low. At this time, the variable volume liquid storage device releases liquid to raise the liquid level in the tube heat exchanger and maintain the suction superheat at 2℃. When the suction superheat is less than 2℃, it indicates that the refrigerant level in the tube heat exchanger is too high. At this time, the variable volume liquid storage device absorbs liquid. At this time, the electronic expansion valve 05 is still used to control the fin heat exchanger to maintain the refrigerant liquid subcooling degree at 2℃.

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

[0097] According to the actual superheat of the indoor heat exchanger 02 being greater than the target superheat, a signal is sent to control the drive 33 to drive the piston 32 to slide towards the direction close to the communication port 311, so that the volume of the flexible bladder 2 increases and releases the refrigerant stored in the refrigerant storage tank 1 into the heating cycle, until the actual superheat is equal to the target superheat.

[0098] According to the actual superheat of the indoor heat exchanger 02 being less than the target superheat, a signal is sent to control the drive 33 to drive the piston 32 to slide away from the direction of the communication port 311, so that the volume of the flexible bladder 2 decreases and absorbs excess refrigerant 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 application, the step of obtaining the working parameters of the air conditioning system includes:

[0100] Determine that the air conditioning system is in heating mode, obtain the actual superheat and the target superheat of the outdoor heat exchanger 03, and the actual subcooling degree and the target subcooling degree of the indoor heat exchanger 02.

[0101] According to the working parameters, the step of sending a signal to control the drive 33 to actuate the piston 32 specifically includes:

[0102] Determine that 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 drive 33 to actuate the piston 32.

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

[0105] Thus, in the heating mode, the method of the present application controls the electronic expansion valve 05 to ensure that the actual superheat degree of the outdoor heat exchanger 03 is stabilized at the target superheat degree, and controls the variable-volume accumulator to ensure that the actual subcooling degree of the indoor heat exchanger 02 is stabilized at the target subcooling degree, so as to ensure that the indoor heat exchanger 02 and the outdoor heat exchanger 03 can operate according to the target operating parameters.

[0106] For example, the indoor heat exchanger 02 is a double-pipe heat exchanger, and the outdoor heat exchanger 03 is a fin heat exchanger. In the winter heating mode, the target superheat degree of the evaporator is set to 2°C. When the actual superheat degree is greater than 2°C, it indicates 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 degree is less than 2°C, the electronic expansion valve 05 needs to be closed.

[0107] The variable-volume accumulator needs to ensure that the liquid level in the double-pipe heat exchanger is in the lowest state at all times, and the condensation subcooling degree is maintained at 2°C. When the actual subcooling degree is greater than 2°C, it indicates that the liquid level in the double-pipe heat exchanger is high, and there is a risk of high condensation pressure. At this time, the accumulator needs to suck in the refrigerant. When the actual subcooling degree is less than 2°C, it indicates that the liquid level in the double-pipe heat exchanger is too low, and there is a risk that the electronic expansion valve 05 cannot be supplied with liquid in time.

[0108] When the electronic expansion valve 05 is opened, the liquid level in the double-pipe heat exchanger decreases, and the subcooling degree of the refrigerant decreases and is less than 2°C. At this time, the variable-volume accumulator acts to release the refrigerant, so that the liquid level of the refrigerant in the double-pipe heat exchanger rises and the subcooling degree is maintained at 2°C. When the electronic expansion valve 05 is closed, the liquid level of the refrigerant in the double-pipe heat exchanger rises, and the subcooling degree is greater than 2°C. At this time, the variable-volume accumulator sucks in the liquid to maintain the subcooling degree at 2°C.

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

[0110] According to the actual subcooling degree of the indoor heat exchanger 02 being less than the target subcooling degree thereof, a signal is sent to control the drive member 33 to drive the piston 32 to slide towards the direction close to the communication port 311, so that the volume of the flexible bladder 2 increases and the refrigerant stored in the refrigerant accumulator 1 is released into the heating cycle, until the actual subcooling degree is equal to the target subcooling degree.

[0111] According to the actual subcooling degree of the indoor heat exchanger 02 being greater than the target subcooling degree thereof, a signal is sent to control the drive member 33 to drive the piston 32 to slide away from the direction close to the communication port 311, so that the volume of the flexible bladder 2 decreases and the excess refrigerant is sucked from the heating cycle into the refrigerant accumulator 1, until the actual subcooling degree is equal to the target subcooling degree.

[0112] In the related art, the heat pump air conditioning unit has a large difference in refrigerant demand between the refrigeration and heating conditions, and also has a difference in refrigerant demand between the high load and small load conditions, the high ambient temperature and low ambient temperature conditions, and the high temperature water outlet and low temperature water outlet conditions under the same heating condition, which is mainly limited by the refrigerant charge amount and is difficult to achieve high capacity and high energy efficiency under various conditions.

[0113] To solve the technical defects existing in the above related art, the control method of the present application can also adjust the total amount of refrigerant participating in the circulation in the air conditioning system by analyzing the working parameters and / or environmental factors of the air conditioning system, using the variable volume liquid storage device, so that the total amount of refrigerant participating in the circulation in the air conditioning system can meet the current air conditioning condition.

[0114] Specifically, in one embodiment of the present application, the environmental factor includes the indoor and outdoor temperature difference between the indoor and outdoor environments, and the step of sending a signal to control the drive member 33 to drive the piston 32 to act according to the environmental factor specifically includes:

[0115] According to the indoor and outdoor temperature difference, a signal is sent to control the drive member 33 to drive the piston 32 to act to adjust the liquid storage amount of the refrigerant storage tank 1. Wherein, the indoor and outdoor temperature difference is negatively correlated with the liquid storage amount of the refrigerant storage tank 1.

[0116] For example, when the indoor and outdoor temperature difference is detected to increase, the load of the air conditioning system adjusted to the same target refrigeration / heating temperature increases, at this time, more refrigerant amount is needed in the air conditioning system to participate in the heat exchange cycle to adapt to the large load operation of the air conditioning system, therefore, the controller controls the variable volume liquid storage device to act, that is, the stepper motor drives the piston 32 to push down to increase the volume of the flexible bladder 2, so as to release the refrigerant stored in the liquid storage device to the air conditioning system to participate in the heat exchange cycle.

[0117] For example, when the indoor and outdoor temperature difference is detected to decrease, the load of the air conditioning system adjusted to the same target refrigeration / heating temperature decreases, at this time, the air conditioning system does not need too much refrigerant amount, to adapt to the small load operation of the air conditioning system, therefore, the controller controls the variable volume liquid storage device to act, that is, the stepper motor drives the piston 32 to pull up to reduce the volume of the flexible bladder 2, so as to absorb the excess refrigerant from the refrigerant participating in the heat exchange cycle in the air conditioning system and store it in the liquid storage device, thereby reducing the total refrigerant amount participating in the heat exchange cycle in the air conditioning system.

[0118] Specifically, in some other embodiments of the present application, the working parameter includes the change information of the target working parameter of the air conditioning system, and the step of sending a signal to control the drive member 33 to drive the piston 32 to act according to the working parameter 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 act so as to adjust the storage amount of the refrigerant storage tank 1.

[0120] The change information of the target working parameter at least includes switching information of a target working mode of the air conditioning system or change information of a target refrigeration / heating temperature.

[0121] In the embodiment, it can be understood that when the working mode of the air conditioning system is switched or when the target refrigeration / heating temperature of the air conditioning system is changed, the total amount of the refrigerant required for participating in the circulation in the air conditioning system is changed, at this time, the controller directly controls the variable-volume storage device to release or store the refrigerant in the air conditioning system, so that the adjustment of the total amount of the refrigerant participating in the heat exchange circulation can be realized, and the rationality of the total amount of the refrigerant participating in the heat exchange circulation under various working conditions can be ensured.

[0122] For example, when the air conditioner is switched from the refrigeration mode to the heating mode, the working amount of the refrigerant required for the working of the air conditioning system is reduced, and thus the controller controls the variable-volume storage device to act, i.e. the stepping motor is driven to pull the piston 32 upward, so that the volume of the flexible bag 2 is reduced, and thus the refrigerant storage device absorbs the excess refrigerant from the refrigerant participating in the heat exchange circulation in the air conditioning system and stores the refrigerant, and further reduces the total amount of the refrigerant participating in the heat exchange circulation in the air conditioning system.

[0123] When the air conditioner is switched from the heating mode to the refrigeration mode, the working amount of the refrigerant required for the working of the air conditioning system is increased, and thus the controller controls the variable-volume storage device to act, i.e. the stepping motor is driven to push the piston 32 downward, so that the volume of the flexible bag 2 is increased, and thus the refrigerant stored in the refrigerant storage device is released to the air conditioning system to participate in the heat exchange circulation.

[0124] For another example, when the target refrigeration temperature of the air conditioner is reduced or the target heating temperature of the air conditioner is increased, the total amount of the refrigerant required for the working of the air conditioning system is increased, and thus the controller controls the variable-volume storage device to act, i.e. the stepping motor is driven to push the piston 32 downward, so that the volume of the flexible bag 2 is increased, and thus the refrigerant stored in the refrigerant storage device is released to the air conditioning system to participate in the heat exchange circulation.

[0125] When the target refrigeration temperature of the air conditioner is increased or the target heating temperature of the air conditioner is reduced, the total amount of the refrigerant required for the working of the air conditioning system is reduced, and thus the controller controls the variable-volume storage device to act, i.e. the stepping motor is driven to pull the piston 32 upward, so that the volume of the flexible bag 2 is reduced, and thus the refrigerant storage device absorbs the excess refrigerant from the refrigerant participating in the heat exchange circulation in the air conditioning system and stores the refrigerant, and further reduces the total amount of the refrigerant participating in the heat exchange circulation in the air conditioning system.

[0126] Figure 4 An example of a schematic diagram of a physical structure of an electronic device is shown in FIG. 1. Figure 4As shown, the electronic device can include a processor 810, a communications interface 820, a memory 830, and a communications bus 840, wherein the processor 810, the communications interface 820, and the memory 830 can communicate with each other through the communications bus 840. The processor 810 can invoke 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 memory 830 described above can be implemented in the form of a software functional unit and sold or used as an independent product, which can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the embodiments of the method of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0128] On the other hand, the present application 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, and the computer program can be executed by a processor to enable a computer to execute the control method of the air conditioning system described above.

[0129] In yet another aspect, the present application also provides a non-transitory computer readable storage medium having a computer program stored thereon, which is executed by a processor to implement the control method of the air conditioning system described above.

[0130] The device embodiments described above are only schematic, wherein the units shown as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e., they can be located in one place, or distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment. Those skilled in the art can understand and implement without creative labor.

[0131] Those skilled in the art can clearly understand the implementation of the various embodiments by means of software and necessary general hardware platforms through the description of the above embodiments, and of course, the implementation can also be through hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part of the prior art that makes a contribution, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods of the various embodiments or some parts of the embodiments.

[0132] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for some technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A variable-capacity liquid storage device for an air conditioning system, characterized in that, The air conditioning system comprises: a refrigerant storage tank, which is provided with an inlet and an outlet, and is internally provided with a flexible capsule with variable volume; a capsule adjusting device, which comprises an adjusting cylinder, a piston and a driving member, the driving member being in transmission connection with the piston for driving the piston to slide in the adjusting cylinder, the adjusting cylinder being in communication with the flexible capsule through a communication port; According to different working parameters of the air conditioning system, the capsule adjusting device is adapted to drive the piston to slide by using the driving member to adjust the flexible capsule to different volumes; the refrigerant storage tank is internally provided with a liquid chamber and a gas chamber, the gas chamber being communicated to the outside of the refrigerant storage tank through a gas outlet, and the liquid chamber being communicated with the inlet and the outlet respectively; The liquid chamber and the gas chamber are communicated through a vent hole, the liquid chamber is provided with a movable float, the float is provided with a plug corresponding to the position of the vent hole, and the plug is adapted to open or close the vent hole with the movement of the float.

2. The variable capacitance accumulator of the air conditioning system according to claim 1, wherein The liquid chamber and the gas chamber are arranged in layers along the up-down direction and are separated by a partition plate, the partition plate is provided with the vent hole; The partition plate is provided with a set of downwardly extending constraint rods, and the float is slidably mounted on the set of constraint rods and is adapted to slide along the up-down direction.

3. The variable-capacity accumulator of the air conditioning system according to any one of claims 1 to 2, characterized by, The driving member is a stepper motor, which is in transmission connection with the piston through a worm and gear structure, wherein the driving end of the stepper motor is in transmission connection with a worm gear, and a worm is in transmission connection with the piston.

4. An air conditioning system characterized by comprising: The air conditioning system comprises: The variable-volume storage device of the air conditioning system according to any one of claims 1 to 3; An indoor heat exchanger, an outdoor heat exchanger and an electronic expansion valve, the variable-volume storage device being connected between the indoor heat exchanger and the electronic expansion valve through the inlet and the outlet.

5. A control method of an air conditioning system according to claim 4, characterized by, The air conditioning system comprises: Obtaining working 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 act, so that the refrigerant storage tank discharges or stores refrigerant; 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 the actual supercooling degree and the target supercooling degree of the outdoor heat exchanger, and the actual superheating degree and the target superheating degree of the indoor heat exchanger; The step of sending a signal to control the driving member to drive the piston to act according to the working parameters specifically comprises: Determining that the air conditioning system is in a cooling mode; According to the actual superheating degree and the target superheating degree of the indoor heat exchanger, a signal is sent to control the driving member to act on the piston; According to the actual supercooling degree and the target supercooling degree of the outdoor heat exchanger, a signal is sent to control the electronic expansion valve in the air conditioning system to act; The step of sending a signal to control the driving member to drive the piston to act according to the actual superheating degree and the target superheating degree of the indoor heat exchanger specifically comprises: According to the actual superheat degree of the indoor heat exchanger being greater than the target superheat degree, a signal is sent to control the driving member to drive the piston to slide towards the communicating port, so that the volume of the flexible bag body is increased and the refrigerant stored in the refrigerant storage tank is released into the refrigeration cycle until the actual superheat degree is equal to the target superheat degree. According to the actual superheat degree of the indoor heat exchanger being less than the target superheat degree, a signal is sent to control the driving member to drive the piston to slide away from the communicating port, so that the volume of the flexible bag body is decreased and the excess refrigerant is absorbed from the refrigeration cycle into the refrigerant storage tank until the actual superheat degree is equal to the target superheat degree. The environmental factors include the temperature difference between the indoor and outdoor environments, and the step of sending a signal to control the driving member to drive the piston according to the environmental factors specifically includes: According to the temperature difference between the indoor and outdoor environments, a signal is sent to control the driving member to drive the piston to adjust the storage amount of the refrigerant storage tank. The temperature difference between the indoor and outdoor environments is negatively correlated with the storage amount of the refrigerant storage tank. 6.The control method of an air conditioning system according to claim 5, characterized in that, The step of obtaining the working parameters of the air conditioning system includes: Determining that the air conditioning system is in a heating mode, obtaining the actual superheat degree and the target superheat degree of the outdoor heat exchanger, and the actual subcooling degree and the target subcooling degree of the indoor heat exchanger; The step of sending a signal to control the driving member to drive the piston according to the working parameters specifically includes: Determining that the air conditioning system is in a heating mode; According to the actual subcooling degree and the target subcooling degree of the indoor heat exchanger, a signal is sent to control the driving member to drive the piston; According to the actual superheat degree and the target superheat degree of the outdoor heat exchanger, a signal is sent to control the operation of the electronic expansion valve in the air conditioning system. 7.The control method of an air conditioning system according to claim 6, characterized in that, The step of sending a signal to control the driving member to drive the piston according to the actual subcooling degree and the target subcooling degree of the indoor heat exchanger specifically includes: According to the actual subcooling degree of the indoor heat exchanger being less than the target subcooling degree, a signal is sent to control the driving member to drive the piston to slide towards the communicating port, so that the volume of the flexible bag body is increased 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; According to the actual subcooling degree of the indoor heat exchanger being greater than the target subcooling degree, a signal is sent to control the driving member to drive the piston to slide away from the communicating port, so that the volume of the flexible bag body is decreased and the 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.

8. The control method of an air conditioning system according to any one of claims 5 to 7, characterized by, The working parameters include change information of the target working parameters of the air conditioning system, and the step of sending a signal to control the driving member to drive the piston according to the working parameters specifically includes: According to the change information of the target working parameters, a signal is sent to control the driving member to drive the piston to adjust the storage amount of the refrigerant storage tank. The change information of the target working parameters is negatively correlated with the storage amount of the refrigerant storage tank. The change information of the target working parameter at least includes switching information of a target working mode of the air conditioning system or change information of a target refrigeration / heating temperature.

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