Control valves for variable displacement compressors

Abstract

The present invention provides a control valve for a variable displacement compressor, comprising a driving part and a valve part, wherein the driving part comprises a housing, a control unit, a Hall element, a moving core, a magnet, a first spring, a static core, a memory alloy driving sheet and a heating element, and the valve part comprises a valve body, a valve core assembly and a connecting rod. The present invention utilizes the property of the memory alloy material to elongate upon heating to drive the valve core assembly to move, thereby realizing automatic closed-loop control of the opening degree of the control valve, and having high control accuracy; the electromagnetic driving mode is eliminated, and the housing, valve body, valve core and other components can be made of lightweight aluminum or ordinary carbon steel materials, with low manufacturing cost, and convenient miniaturization of the control valve; the impact of the valve core assembly on the valve body is reduced, which helps to extend the service life of the control valve; there is no need to use a bellows pressure-sensitive element, thereby avoiding additional equipment investment; and the problem of decreased control valve performance caused by elastic attenuation of the bellows after use is avoided.

Description

Technical Field

[0001] The invention relates to the field of compressor control valves, and in particular to a control valve for a variable displacement compressor. Background Art

[0002] The automobile air conditioning compressor is the heart of the automobile air conditioning refrigeration system, playing the role of compressing and transporting refrigerant vapor. According to different working principles, air conditioning compressors can be divided into fixed displacement compressors and variable displacement compressors. Many new automobile air conditioning systems currently use compressors with variable displacement. When the air conditioning system is working, changing the compressor's displacement can change the cooling capacity, which is convenient for adjustment and can save energy.

[0003] The control valve is an important component of the variable displacement compressor. It can steplessly adjust the power of the compressor and change the displacement of the compressor. The traditional automobile variable displacement compressor control valve adopts electromagnetic drive or micro-motor drive, and uses the bellows pressure sensing principle to control the valve opening. However, the traditional variable displacement compressor control valve has the following problems:

[0004] 1. When manufacturing electromagnetically driven control valves, the material requirements for the shell, valve body and valve core are relatively high. The shell needs to be made of pure iron with good magnetic conductivity and strict carbon content, the valve body needs to be made of copper, and the valve core needs to be made of stainless steel, which results in high manufacturing costs.

[0005] 2. The control valve is large in size, which makes installation and use inconvenient. During use, the valve core has a large impact on the valve port, and the service life of the control valve is short, which increases the replacement cost.

[0006] 3. The manufacturing cost of bellows pressure-sensing elements is high, which increases the investment in additional equipment. After a period of use, bellows pressure-sensing elements will have the problem of elastic attenuation, which can easily cause the performance of the control valve to decline and lead to air-conditioning system failure. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings existing in the prior art and to propose a control valve for a variable displacement compressor, which optimizes the structure and material design, miniaturizes the control valve, reduces the manufacturing cost, extends the service life of the control valve, and makes the control of the control valve more precise.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A control valve for a variable displacement compressor comprises a drive part and a valve part.

[0010] The driving part includes a shell, a control unit, a Hall element, a moving core, a magnet, a first spring, a stationary core, a memory alloy driving plate and a heating element; the control unit is arranged at the upper part of the interior of the shell, and the Hall element is arranged at the bottom of the control unit and is electrically connected to the control unit; the moving core is movably arranged at the bottom of the Hall element, the magnet is arranged on the moving core, and the first spring is arranged on the outside of the moving core; the stationary core is fixed in the shell and is located below the moving core; the memory alloy driving plate is arranged at the bottom end of the stationary core or at the inside of the valve part, the heating element is connected to the memory alloy driving plate, and the heating element is electrically connected to the control unit.

[0011] The valve part includes a valve body, a valve core assembly and a connecting rod; the upper end of the valve body is connected to the lower end of the shell, the valve core assembly is arranged inside the valve body, and the valve core assembly is connected to the memory alloy driving plate; the lower end of the connecting rod is connected to the valve core assembly, and the upper end of the connecting rod upwardly penetrates the stationary core and is connected to the moving core.

[0012] Preferably, the valve part further comprises a second spring, wherein the second spring is sleeved on the upper end of the connecting rod and corresponds to the lower side of the moving core and the inner side of the stationary core.

[0013] Preferably, the valve core assembly includes a valve core and a third spring, the lower end of the connecting rod is connected to the upper end of the valve core, the memory alloy drive plate is arranged at the bottom end of the stationary core, and the memory alloy drive plate is connected to the upper end of the valve core; the third spring is arranged below the valve core, and the two ends of the third spring are respectively connected to the lower end of the valve core and the bottom inner wall of the valve body.

[0014] Furthermore, a first sealing valve port is provided on the inner wall of the valve body, a first sealing cone is provided on the valve core, and the structure of the first sealing cone matches the structure of the first sealing valve port.

[0015] Preferably, the valve core assembly includes an upper valve core, a lower valve core, a first sealing ball valve and a fourth spring, the first sealing ball valve is arranged at the connection between the upper valve core and the lower valve core, the lower end of the connecting rod is connected to the upper end of the upper valve core, and the fourth spring sleeve is arranged on the outside of the upper valve core; the memory alloy drive plate is arranged at the bottom end of the stationary core, and the memory alloy drive plate is connected to the upper end of the upper valve core.

[0016] Preferably, the valve core assembly includes a valve stem, a valve seat and a second sealing ball valve, the upper end of the valve stem is connected to the lower end of the connecting rod, the lower end of the valve stem is connected to the valve seat, and the second sealing ball valve is arranged at the connection between the valve stem and the valve seat; the memory alloy drive plate is arranged at the bottom end of the stationary core and connected to the upper end of the valve stem.

[0017] Preferably, the lower end of the valve body has an end cover, the valve core assembly includes a movable block, a cover and a fifth spring, the movable block is movably arranged in the valve body, the lower end of the connecting rod is connected to the movable block, the cover is arranged below the movable block, the memory alloy drive plate is arranged between the movable block and the cover, and the memory alloy drive plate is connected to the movable block, the upper end of the fifth spring passes through the cover and is connected to the movable block, and the lower end of the fifth spring is connected to the inner wall of the end cover.

[0018] Furthermore, a second sealing valve port is provided on the inner wall of the valve body, a second sealing cone is provided on the connecting rod, and the structure of the second sealing cone matches the structure of the second sealing valve port.

[0019] Preferably, the valve body is provided with an intake pressure chamber Ps channel, an exhaust pressure chamber Pd channel and a slant plate chamber Pc channel, and a filter is provided at an outer port of the exhaust pressure chamber Pd channel.

[0020] Preferably, the driving part also includes a support sleeve, which is fixed to the inside of the shell, and is in the shape of a cylinder with an opening facing downward. The support sleeve is arranged on the outside of the moving core and the static core, and the lower end of the static core extends out of the support sleeve.

[0021] Preferably, the driving part further comprises a connector, which is arranged on the upper side of the housing and connected to the control unit.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. According to the heating and elongation characteristics of the memory alloy material, the memory alloy drive plate is heated by the heating element. The memory alloy drive plate elongates, thereby driving the valve core assembly to move, and indirectly driving the connecting rod, moving core and magnet to move. After the Hall element senses the displacement of the moving core and the magnet, the generated voltage signal is fed back to the control unit. The control unit automatically adjusts the heating temperature of the memory alloy drive plate by the heating element according to the voltage signal, realizing automatic closed-loop control of the opening degree of the control valve with high control accuracy.

[0024] 2. The electromagnetic drive mode is cancelled, and the housing, valve body, valve core and other components can be made of lightweight aluminum or ordinary carbon steel materials, which has low manufacturing cost and facilitates the miniaturization of the control valve; it reduces the impact of the valve core assembly on the valve body and helps to extend the service life of the control valve.

[0025] 3. No need to use bellows pressure-sensitive elements, avoiding additional equipment investment; at the same time, avoiding the problem of control valve performance degradation caused by elastic attenuation of the bellows after use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A longitudinal cross-sectional view of a control valve of a variable displacement compressor according to embodiment 1 of the present invention;

[0027] Figure 2 A longitudinal cross-sectional view of a valve portion of a control valve of a variable displacement compressor according to embodiment 1 of the present invention;

[0028] Figure 3 A longitudinal cross-sectional view of a control valve of a variable displacement compressor according to embodiment 2 of the present invention;

[0029] Figure 4 A longitudinal sectional view of a control valve of a variable displacement compressor according to embodiment 3 of the present invention;

[0030] Figure 5 This is a longitudinal cross-sectional view of a control valve of a variable displacement compressor according to embodiment 4 of the present invention.

[0031] In the figure, 10-driving part, 101-housing, 102-control unit, 103-Hall element, 104-moving core, 105-magnet, 106-first spring, 107-static core, 108-memory alloy driving plate, 109-heating element, 110-wire, 111-support sleeve, 112-connector, 20-valve part, 201-valve body, 202-connecting rod, 203-second spring, 204-filter, 205-valve core, 206- The third spring, 207-axial channel, 208-radial channel, 209-first sealing valve port, 210-first sealing cone, 211-upper valve core, 212-lower valve core, 213-first sealing ball valve, 214-fourth spring, 215-valve stem, 216-valve seat, 217-second sealing ball valve, 218-end cover, 219-movable block, 220-sealing cover, 221-fifth spring, 222-second sealing valve port, 223-second sealing cone. DETAILED DESCRIPTION

[0032] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0033] The present invention provides a control valve for a variable displacement compressor, comprising a driving part 10 and a valve part 20. The driving part 10 comprises a housing 101, a control unit 102, a Hall element 103, a moving core 104, a magnet 105, a first spring 106, a stationary core 107, a memory alloy driving plate 108 and a heating element 109; the control unit 102 is arranged at the upper part of the interior of the housing 101, the Hall element 103 is arranged at the lower part of the control unit 102 and is electrically connected to the control unit 102; the moving core 104 is movably arranged at the lower part of the Hall element 103, the magnet 105 is arranged on the moving core 104, and the first spring 106 is sleeved on the outer side of the moving core 104; the stationary core 107 is fixedly arranged in the housing 101 and is located at the lower part of the moving core 104; the memory alloy driving plate 108 is arranged at the bottom end of the stationary core 107 or at the interior of the valve part 20, the heating element 109 is connected to the memory alloy driving plate 108, and the heating element 109 is electrically connected to the control unit 102 through a wire 110. The valve part 20 includes a valve body 201, a valve core assembly and a connecting rod 202; the upper end of the valve body 201 is connected to the lower end of the shell 101, the valve core assembly is arranged inside the valve body 201, and the valve core assembly is connected to the memory alloy driving plate 108; the lower end of the connecting rod 202 is connected to the valve core assembly, and the upper end of the connecting rod 202 upwardly penetrates the stationary core 107 and is connected to the dynamic core 104 by interference fit.

[0034] The memory alloy drive plate 108 has the characteristics of elongation when heated and recovery to its original state when cooled, and its deformation changes with the change of heating temperature; in use, the control unit 102 is used to control the current passing to the heating element 109 to control the heating temperature. The heating element 109 heats the memory alloy drive plate 108, and the memory alloy drive plate 108 is deformed, driving the valve core assembly to move, and at the same time driving the connecting rod 202, the moving core 104 and the magnet 105 to move together, and then the magnetic field near the Hall element 103 changes, and the voltage signal changes in the Hall element 103. After receiving the change value of the voltage signal generated by the Hall element 103, the control unit 102 converts it into the actual opening degree change of the control valve, and compares the actual opening degree with the required opening degree, and automatically adjusts the current passing to the heating element 109 to control the heating temperature, that is, to control the deformation of the memory alloy drive plate 108, thereby realizing automatic closed-loop control of the opening degree of the control valve, with high control accuracy and fast adjustment efficiency.

[0035] Preferably, the driving part 10 further includes a support sleeve 111, which is fixed inside the housing 101 and is located below the Hall element 103. The support sleeve 111 is in the shape of a cylinder with an opening facing downward. The support sleeve 111 is sleeved outside the moving core 104 and the static core 107, and the lower end of the static core 107 extends out of the support sleeve 111. The support sleeve 111 is used to fix the static core 107 and limit the range of movement of the moving core 104. The moving core 104, the magnet 105, and the first spring 106 are all located inside the support sleeve 111. Under the indirect drive of the memory alloy driving plate 108, the moving core 104 can move up and down within the limited range of the upper end of the support sleeve 111.

[0036] Preferably, the driving part 10 further comprises a connector 112, which is disposed on the upper side of the housing 101 and is connected to the control unit 102. The connector 112 is used to connect a power source to supply power to the control valve.

[0037] Preferably, the valve part 20 further includes a second spring 203, which is sleeved on the upper end of the connecting rod 202 and corresponds to the lower part of the moving core 104 and the inner part of the static core 107. The second spring 203 can play a buffering and shock absorbing role, which can reduce the impact of the moving core 104 on the static core 107 when it moves, and extend the service life of the control valve.

[0038] Preferably, a suction pressure chamber Ps channel, an exhaust pressure chamber Pd channel and a swash plate chamber Pc channel are provided on the valve body 201. In use, the suction pressure chamber Ps channel is connected to the suction pressure chamber of the compressor, the exhaust pressure chamber Pd channel is connected to the exhaust pressure chamber of the compressor, and the swash plate chamber Pc channel is connected to the swash plate chamber of the compressor; a filter 204 is provided at the outer port of the exhaust pressure chamber Pd channel for filtering the refrigerant to prevent impurities from entering the control valve.

[0039] The control valve of the present invention eliminates the electromagnetic drive mode, and the housing 101, valve body 201, valve core assembly and other components can be made of lightweight aluminum or ordinary carbon steel materials, with low manufacturing cost, which facilitates the miniaturization of the control valve; there is no need to use a bellows pressure-sensitive element, thus avoiding additional equipment investment and avoiding the problem of decreased control valve performance caused by elastic attenuation of the bellows after use.

[0040] Embodiment 1:

[0041] Please refer to Figure 1 and Figure 2 , Figure 1 is a longitudinal sectional view of a control valve of a variable displacement compressor according to embodiment 1 of the present invention, Figure 2 This is a longitudinal cross-sectional view of a valve portion in a control valve for a variable displacement compressor according to Example 1 of the present invention; a control valve 100 for a variable displacement compressor according to Example 1 of the present invention comprises a drive portion 10 and a valve portion 20.

[0042] The driving part 10 includes a housing 101, a control unit 102, a Hall element 103, a moving core 104, a magnet 105, a first spring 106, a static core 107, a memory alloy driving sheet 108, a heating element 109, a support sleeve 111 and a joint 112; the control unit 102 is arranged at the upper part of the housing 101, the Hall element 103 is arranged at the lower part of the control unit 102 and is electrically connected to the control unit 102; the joint 112 is arranged at the upper side of the housing 101, and the joint 112 is connected to the control unit 102; the moving core 104 can move It is arranged below the Hall element 103, the magnet 105 is arranged on the moving core 104, and the first spring 106 is sleeved on the outside of the moving core 104; the stationary core 107 is fixed in the shell 101 and is located below the moving core 104; the support sleeve 111 is sleeved on the outside of the moving core 104 and the stationary core 107, and the lower end of the stationary core 107 extends out of the support sleeve 111; the memory alloy driving plate 108 is arranged at the bottom end of the stationary core 107, the heating element 109 is connected to the memory alloy driving plate 108, and the heating element 109 is electrically connected to the control unit 102 through the wire 110.

[0043] The valve part 20 includes a valve body 201, a valve core assembly, a connecting rod 202 and a second spring 203; the upper end of the valve body 201 is connected to the lower end of the housing 101, and the valve body 201 is provided with an air intake pressure chamber Ps channel, an exhaust pressure chamber Pd channel and a slant disc chamber Pc channel from top to bottom, and the air intake pressure chamber Ps channel, the exhaust pressure chamber Pd channel and the slant disc chamber Pc channel are all arranged along the radial direction of the valve body 201, and a filter 201 is arranged at the outer port of the exhaust pressure chamber Pd channel; the valve core assembly is arranged inside the valve body 201, and the valve core assembly includes a valve core 205 and a third spring 206, and the lower end of the connecting rod 202 is connected to the valve core The upper end of the connecting rod 202 is connected by interference fit with the valve core 205, the memory alloy driving plate 108 is arranged between the static core 107 and the valve core 205, and the memory alloy driving plate 108 is connected to the upper end of the valve core 205; the third spring 206 is arranged below the valve core 205, and the upper and lower ends of the third spring 206 are respectively connected to the lower end of the valve core 205 and the bottom inner wall of the valve body 201; the lower end of the connecting rod 202 is connected to the valve core 205 by interference fit, and the upper end of the connecting rod 202 upwardly penetrates the static core 107 and is connected to the dynamic core 104 by interference fit, and the second spring 203 is sleeved on the upper end of the connecting rod 202 and corresponds to the bottom of the dynamic core 104 and the inside of the static core 107.

[0044] Preferably, the valve core 205 is provided with an axial channel 207 and a radial channel 208, and the axial channel 207 is connected with the radial channel 208. Further, the inner wall of the valve body 201 is provided with a first sealing valve port 209, and the valve core 205 is provided with a first sealing cone 209, and the structure of the first sealing cone 209 matches the structure of the first sealing valve port 208.

[0045] During use, the heating element 109 heats the memory alloy drive plate 108, and the memory alloy drive plate 108 deforms and stretches, driving the valve core 205 to move upward, and the pressure of the suction pressure chamber Ps channel acts on the swash plate chamber Pc channel through the radial channel 207 and the axial channel 208 in the middle of the valve core 205, generating a downward force, changing the opening from the Pd end to the Pc end, thereby controlling the pressure of the compressor swash plate chamber; because the two ends of the connecting rod 202 are respectively connected with the moving core 104 and the valve core 205 by interference fit, when the memory alloy drive plate 108 drives the valve core 205 to move upward, it can drive the moving core 104 and the magnet 105 to move upward together, and the Hall element 103 senses the change in the magnetic field and generates a voltage signal change. The control unit 102 calculates and compares the actual opening degree of the control valve with the required opening degree according to the change value of the voltage signal, and automatically adjusts the current to the heating element 109 and the heating temperature, that is, adjusts the deformation degree of the memory alloy drive plate 108, to achieve closed-loop automatic control of the opening degree of the control valve 100.

[0046] Embodiment 2:

[0047] See also Figure 3 , Figure 3 This is a longitudinal cross-sectional view of a control valve of a variable displacement compressor according to embodiment 2 of the present invention; a control valve 200 of a variable displacement compressor according to embodiment 2 of the present invention comprises a driving part 10 and a valve part 20.

[0048] The driving part 10 includes a housing 101, a control unit 102, a Hall element 103, a moving core 104, a magnet 105, a first spring 106, a static core 107, a memory alloy driving sheet 108, a heating element 109, a support sleeve 111 and a joint 112; the control unit 102 is arranged at the upper part of the housing 101, the Hall element 103 is arranged at the lower part of the control unit 102 and is electrically connected to the control unit 102; the joint 112 is arranged at the upper side of the housing 101, and the joint 112 is connected to the control unit 102; the moving core 104 can move It is arranged below the Hall element 103, the magnet 105 is arranged on the moving core 104, and the first spring 106 is sleeved on the outside of the moving core 104; the stationary core 107 is fixed in the shell 101 and is located below the moving core 104; the support sleeve 111 is sleeved on the outside of the moving core 104 and the stationary core 107, and the lower end of the stationary core 107 extends out of the support sleeve 111; the memory alloy driving plate 108 is arranged at the bottom end of the stationary core 107, the heating element 109 is connected to the memory alloy driving plate 108, and the heating element 109 is electrically connected to the control unit 102 through the wire 110.

[0049] The valve part 20 includes a valve body 201, a valve core assembly, a connecting rod 202 and a second spring 203; the upper end of the valve body 201 is connected to the lower end of the housing 101, and the valve body 201 is provided with a suction pressure chamber Ps channel, an exhaust pressure chamber Pd channel and a slant disc chamber Pc channel, and the suction pressure chamber Ps channel, the exhaust pressure chamber Pd channel and the slant disc chamber Pc channel are all arranged along the radial direction of the valve body 201, and a filter 204 is arranged at the outer port of the exhaust pressure chamber Pd channel; the valve core assembly is arranged inside the valve body 201, and the valve core assembly includes an upper valve core 211, a lower valve core 212, a first sealing ball valve 2 13 and the fourth spring 214, the first sealing ball valve 213 is arranged at the connection between the upper valve core 211 and the lower valve core 212, the lower end of the connecting rod 202 is connected with the upper end of the upper valve core 211 by interference fit, and the fourth spring 214 is sleeved on the outer side of the upper valve core 211; the memory alloy drive plate 108 is arranged at the bottom end of the static core 107, and the memory alloy drive plate 108 is connected with the upper end of the upper valve core 211; the upper end of the connecting rod 202 passes through the static core 107 upward and is connected with the dynamic core 104, and the second spring 203 is sleeved on the upper end of the connecting rod 202 and corresponds to the bottom of the dynamic core 104 and the inside of the static core 107.

[0050] During use, the heating element 109 heats the memory alloy drive plate 108, and the memory alloy drive plate 108 deforms and elongates, driving the upper valve core 211 to move upward, changing the opening from the Pd end to the Pc end, thereby controlling the pressure of the compressor inclined plate cavity; since the two ends of the connecting rod 202 are respectively connected to the moving core 104 and the upper valve core 211 by interference fit, when the memory alloy drive plate 108 drives the upper valve core 211 to move upward, it can drive the moving core 104 and the magnet 105 to move upward together, and the Hall element 103 senses the change in the magnetic field and generates a voltage signal change. The control unit 102 calculates and compares the actual opening degree of the control valve 200 with the required opening degree based on the voltage signal change value, and automatically adjusts the current to the heating element 109 and the heating temperature, that is, adjusts the deformation degree of the memory alloy drive plate 108, to achieve closed-loop automatic control of the opening degree of the control valve 200.

[0051] Embodiment 3:

[0052] See also Figure 4 , Figure 4 This is a longitudinal cross-sectional view of a control valve of a variable displacement compressor according to embodiment 3 of the present invention; a control valve 300 of a variable displacement compressor according to embodiment 3 of the present invention comprises a driving part 10 and a valve part 20.

[0053] The driving part 10 includes a housing 101, a control unit 102, a Hall element 103, a moving core 104, a magnet 105, a first spring 106, a static core 107, a memory alloy driving sheet 108, a heating element 109, a support sleeve 111 and a joint 112; the control unit 102 is arranged at the upper part of the housing 101, the Hall element 103 is arranged at the lower part of the control unit 102 and is electrically connected to the control unit 102; the joint 112 is arranged at the upper side of the housing 101, and the joint 112 is connected to the control unit 102; the moving core 104 can move It is arranged below the Hall element 103, the magnet 105 is arranged on the moving core 104, and the first spring 106 is sleeved on the outside of the moving core 104; the stationary core 107 is fixed in the shell 101 and is located below the moving core 104; the support sleeve 111 is sleeved on the outside of the moving core 104 and the stationary core 107, and the lower end of the stationary core 107 extends out of the support sleeve 111; the memory alloy driving plate 108 is arranged at the bottom end of the stationary core 107, the heating element 109 is connected to the memory alloy driving plate 108, and the heating element 109 is electrically connected to the control unit 102 through the wire 110.

[0054] The valve part 20 includes a valve body 201, a valve core assembly, a connecting rod 202 and a second spring 203; the upper end of the valve body 201 is connected to the lower end of the housing 101, and the valve body 201 is provided with an air suction pressure chamber Ps channel, an exhaust pressure chamber Pd channel and a slant disc chamber Pc channel, the air suction pressure chamber Ps channel and the slant disc chamber Pc channel are arranged along the radial direction of the valve body 201, the exhaust pressure chamber Pd channel is arranged along the axial direction of the valve body 201, and a filter 204 is arranged at the outer port of the exhaust pressure chamber Pd channel; the valve core assembly is arranged inside the valve body 201, and the valve core assembly includes a valve stem 2 15. A valve seat 216 and a second sealing ball valve 217. The upper end of the valve stem 215 is connected with the lower end of the connecting rod 202 by interference fit, and the lower end of the valve stem 215 is connected with the valve seat 216. The second sealing ball valve 217 is arranged at the connection between the valve stem 215 and the valve seat 216. The memory alloy drive plate 108 is arranged at the bottom end of the static core 107 and connected with the upper end of the valve stem 215. The upper end of the connecting rod 202 penetrates the static core 107 upward and is connected with the moving core 104. The second spring 203 is sleeved on the upper end of the connecting rod 202 and corresponds to the bottom of the moving core 104 and the inside of the static core 107.

[0055] During use, the heating element 109 heats the memory alloy drive plate 108, and the memory alloy drive plate 108 deforms and elongates, driving the valve stem 215 to move upward, changing the opening of the control valve 300, thereby controlling the pressure of the compressor swash plate cavity; since the two ends of the connecting rod 202 are respectively connected with the moving core 104 and the valve stem 215 by interference fit, when the memory alloy drive plate 108 drives the valve stem 215 to move upward, it can drive the moving core 104 and the magnet 105 to move upward together, and the Hall element 103 senses the change in the magnetic field and generates a voltage signal change. The control unit 102 calculates and compares the actual opening degree of the control valve 300 with the required opening degree based on the voltage signal change value, and automatically adjusts the current to the heating element 109 and the heating temperature, that is, adjusts the deformation degree of the memory alloy drive plate 108, to achieve closed-loop automatic control of the opening degree of the control valve 300.

[0056] Embodiment 4:

[0057] See also Figure 5 , Figure 5 This is a longitudinal cross-sectional view of a control valve of a variable displacement compressor according to embodiment 4 of the present invention; a control valve 400 of a variable displacement compressor according to embodiment 4 of the present invention comprises a driving part 10 and a valve part 20.

[0058] The driving part 10 includes a housing 101, a control unit 102, a Hall element 103, a moving core 104, a magnet 105, a first spring 106, a static core 107, a memory alloy driving sheet 108, a heating element 109, a support sleeve 111 and a joint 112; the control unit 102 is arranged at the upper part of the housing 101, the Hall element 103 is arranged at the lower part of the control unit 102 and is electrically connected to the control unit 102; the joint 112 is arranged at the upper side of the housing 101, and the joint 112 is connected to the control unit 102; the moving core 104 is movably arranged Below the Hall element 103, the magnet 105 is arranged on the moving core 104, and the first spring 106 is sleeved on the outer side of the moving core 104; the stationary core 107 is fixedly arranged in the housing 101 and is located below the moving core 104; the support sleeve 111 is sleeved on the outer sides of the moving core 104 and the stationary core 107, and the lower end of the stationary core 107 extends out of the support sleeve 111; the memory alloy driving sheet 108 is arranged inside the valve part 20, the heating element 109 is connected to the memory alloy driving sheet 108, and the heating element 109 is electrically connected to the control unit 102 through the wire 110;

[0059] The valve part 20 includes a valve body 201, a valve core assembly, a connecting rod 202 and a second spring 203; the upper end of the valve body 201 is connected to the lower end of the housing 101, the lower end of the valve body 201 has an end cover 218, the valve body 201 is provided with an intake pressure chamber Ps channel, an exhaust pressure chamber Pd channel and a slant disc chamber Pc channel, the intake pressure chamber Ps channel is arranged along the axial direction of the valve body 201, the exhaust pressure chamber Pd channel and the slant disc chamber Pc channel are arranged along the radial direction of the valve body 201, and a filter 204 is arranged at the outer port of the exhaust pressure chamber Pd channel; the valve core assembly is arranged inside the valve body 201, the valve core assembly includes a movable block 219, a cover 220 and a fifth spring 221, the movable block 219 is movably arranged in the valve body 201, the lower end of the connecting rod 202 is connected to the movable block 219 by interference fit, the cover 220 is arranged below the movable block 219, the memory alloy driving plate 108 is arranged between the movable block 219 and the cover 220, and the memory alloy driving plate 108 is connected to the movable block 219, the upper end of the fifth spring 221 passes through the cover 220 and is connected to the movable block 219, and the lower end of the fifth spring 221 is connected to the inner wall of the end cover 218; the upper end of the connecting rod 202 upwardly penetrates the static core 107 and is connected to the dynamic core 104 by interference fit, and the second spring 203 is sleeved on the upper end of the connecting rod 202 and corresponds to the bottom of the dynamic core 104 and the inside of the static core 107.

[0060] Preferably, a second sealing valve port 222 is provided on the inner wall of the valve body 201, and a second sealing cone 223 is provided on the connecting rod 202. The structure of the second sealing cone 223 matches the structure of the second sealing valve port 202. When the second sealing cone 223 is tightly matched with the second sealing valve port 202, the opening of the control valve 400 is zero and the sealing performance is strong.

[0061] During use, the heating element 109 heats the memory alloy drive plate 108, and the memory alloy drive plate 108 deforms and elongates, driving the movable block 219 to move upward, thereby changing the opening of the control valve 400 and controlling the pressure of the compressor swash plate cavity; since the two ends of the connecting rod 202 are respectively connected with the moving core 104 and the movable block 219 by interference fit, when the memory alloy drive plate 108 drives the movable block 219 to move upward, it can drive the moving core 104 and the magnet 105 to move upward together, and the Hall element 103 senses the change in the magnetic field and generates a voltage signal change. The control unit 102 calculates and compares the actual opening degree of the control valve with the required opening degree according to the change value of the voltage signal, and automatically adjusts the current to the heating element 109 and the heating temperature, that is, adjusts the deformation degree of the memory alloy drive plate 108, to achieve closed-loop automatic control of the opening degree of the control valve 400.

[0062] In summary, the present invention provides a control valve for a variable displacement compressor. According to the heating and elongation characteristics of the memory alloy material, a heating element is used to heat the memory alloy drive plate. The memory alloy drive plate is elongated, thereby driving the valve core assembly to move, and indirectly driving the connecting rod, the moving core and the magnet to move. After the Hall element senses the displacement of the moving core and the magnet, the generated voltage signal is fed back to the control unit. The control unit automatically adjusts the heating temperature of the memory alloy drive plate by the heating element according to the voltage signal, thereby realizing automatic closed-loop control of the opening degree of the control valve with high control accuracy. The electromagnetic drive mode is cancelled, and the housing, valve body, valve core and other components can be made of lightweight aluminum or ordinary carbon steel materials, with low manufacturing cost, which facilitates the miniaturization of the control valve. The impact of the valve core assembly on the valve body is reduced, which helps to extend the service life of the control valve. There is no need to use a bellows pressure-sensitive element, thereby avoiding additional equipment investment. At the same time, the problem of decreased control valve performance caused by elastic attenuation of the bellows after use is avoided.

[0063] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A control valve for a variable displacement compressor, characterized in that: Including drive part and valve part; The driving part includes a shell, a control unit, a Hall element, a moving core, a magnet, a first spring, a static core, a memory alloy driving sheet, a heating element and a supporting sleeve; the control unit is arranged on the upper part of the inner part of the shell, and the Hall element is arranged on the lower part of the control unit and is electrically connected to the control unit; the moving core is movably arranged below the Hall element, the magnet is arranged on the moving core, and the first spring is sleeved on the outer side of the moving core; the static core is fixedly arranged in the shell and is located below the moving core; the supporting sleeve is fixed to the inner part of the shell, the supporting sleeve is a cylindrical shape with an opening facing downward, the supporting sleeve is sleeved on the outer sides of the moving core and the static core, and the lower end of the static core extends out of the supporting sleeve; the memory alloy driving sheet is arranged at the bottom end of the static core or arranged inside the valve part, the heating element is connected to the memory alloy driving sheet, and the heating element is electrically connected to the control unit; The valve part includes a valve body, a valve core assembly and a connecting rod; the valve body is provided with an intake pressure chamber Ps channel, an exhaust pressure chamber Pd channel and a slant disc chamber Pc channel, and a filter is provided at the outer port of the exhaust pressure chamber Pd channel; the upper end of the valve body is connected to the lower end of the outer shell, the valve core assembly is arranged inside the valve body, and the valve core assembly is connected to the memory alloy drive plate; the lower end of the connecting rod is connected to the valve core assembly, and the upper end of the connecting rod upwardly penetrates the stationary core and is connected to the moving core.

2. The control valve for a variable displacement compressor according to claim 1, characterized in that: The valve part also includes a second spring, which is sleeved on the upper end of the connecting rod and corresponds to the lower part of the moving core and the inside of the stationary core.

3. The control valve for a variable displacement compressor according to claim 2, characterized in that: The valve core assembly includes a valve core and a third spring. The lower end of the connecting rod is connected to the upper end of the valve core. The memory alloy drive plate is arranged at the bottom end of the stationary core, and the memory alloy drive plate is connected to the upper end of the valve core. The third spring is arranged below the valve core, and the two ends of the third spring are respectively connected to the lower end of the valve core and the inner wall of the bottom end of the valve body.

4. The control valve for a variable displacement compressor according to claim 3, characterized in that: The inner wall of the valve body is provided with a first sealing valve port, and the valve core is provided with a first sealing cone. The structure of the first sealing cone matches the structure of the first sealing valve port.

5. The control valve for a variable displacement compressor according to claim 2, characterized in that: The valve core assembly includes an upper valve core, a lower valve core, a first sealing ball valve and a fourth spring. The first sealing ball valve is arranged at the connection between the upper valve core and the lower valve core. The lower end of the connecting rod is connected to the upper end of the upper valve core. The fourth spring sleeve is arranged on the outer side of the upper valve core. The memory alloy drive plate is arranged at the bottom end of the static core, and the memory alloy drive plate is connected to the upper end of the upper valve core.

6. The control valve for a variable displacement compressor according to claim 2, characterized in that: The valve core assembly includes a valve stem, a valve seat and a second sealing ball valve, the upper end of the valve stem is connected to the lower end of the connecting rod, the lower end of the valve stem is connected to the valve seat, and the second sealing ball valve is arranged at the connection between the valve stem and the valve seat; the memory alloy drive plate is arranged at the bottom end of the static core and connected to the upper end of the valve stem.

7. The control valve for a variable displacement compressor according to claim 2, characterized in that: The lower end of the valve body is provided with an end cover, and the valve core assembly includes a movable block, a cover and a fifth spring. The movable block is movably arranged in the valve body, the lower end of the connecting rod is connected to the movable block, the cover is arranged below the movable block, the memory alloy driving plate is arranged between the movable block and the cover, and the memory alloy driving plate is connected to the movable block, the upper end of the fifth spring passes through the cover and is connected to the movable block, and the lower end of the fifth spring is connected to the inner wall of the end cover.

8. The control valve for a variable displacement compressor according to claim 7, characterized in that: A second sealing valve port is provided on the inner wall of the valve body, and a second sealing cone is provided on the connecting rod. The structure of the second sealing cone matches the structure of the second sealing valve port.

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