Variable displacement compressor control valve with signal feedback

Abstract

The utility model relates to the technical field of automobile air conditioner and disclose a variable displacement compressor control valve with signal feedback, through increasing a permanent magnet in the upper end of moving iron core, increasing the detection module that can induct permanent magnet position change in the upper end of coil assembly, since permanent magnet and moving iron core adopt fixed connection, when the electromagnetic coil is electrified, moving iron core displacement occurs downward, through the top rod and transmit the motion displacement to the valve core, the displacement of valve core is same with the displacement of permanent magnet, and the magnetic field change caused by permanent magnet displacement is inducted by detection module, and is transmitted to the control system of automobile air conditioner, ensure the stability of control valve in the main valve port output flow under the setting current. The control valve of this structure can directly transmit the displacement of valve core through signal output, be convenient for air conditioning system to identify the actual working condition of electric control valve valve port, can realize the accurate control and trouble alarm of electric control valve.

Description

Technical Field

[0001] This utility model relates to the field of automotive air conditioning technology, specifically to a variable displacement compressor control valve with signal feedback. Background Technology

[0002] The variable displacement electronic control valve is located inside the air conditioning compressor. It forms a sealing surface with the compressor's inner wall via an O-ring, creating three independent air chambers: Pd, Ps, and Pc. These three chambers correspond to the compressor's exhaust chamber (Pd), intake chamber (Ps), and swashplate chamber (Pc), respectively. By moving the valve core within the valve body, the valve opening size is adjusted, changing the flow rate and pressure from chamber Pd to chamber Pc. This, in turn, alters the swashplate angle inside the compressor, achieving variable displacement control.

[0003] Existing externally controlled electric control valves for automotive air conditioning variable displacement compressors, such as the capacity control valve disclosed in Chinese Patent Application No. CN031043070, mainly include: a moving iron core, a coil, a fixed iron core, an O-ring, a valve stem, a valve body, and a bellows. When the bellows assembly senses a change in air pressure from the compressor intake port (Ps), it will extend or shorten, transmitting displacement and force to the valve stem. At the same time, if the electromagnetic coil receives a current signal from the external control part of the air conditioning system, it will generate an electromagnetic force that attracts the electromagnetic core to push the valve stem downward. This interacts with the displacement force generated by the bellows assembly to form a balanced force and displacement. The direction and amount of axial displacement of the valve stem determine the change in valve opening, thereby adjusting the airflow between the compressor exhaust port (Pd) and the swing box (Pc), thus changing the compressor's refrigeration displacement.

[0004] The aforementioned types of electronically controlled valves currently only unidirectionally execute the current signal sent by the air conditioning system to change the valve opening. However, the opening size cannot be fed back to the air conditioning control system. This is because the valve opening is composed of the combined forces of the electromagnetic force generated by the coil magnetic flux, the bellows elasticity, and the spring elasticity. Therefore, for the same control current, the valve opening is not exactly the same, resulting in relatively poor control accuracy. The air conditioning system often needs to use various temperature and pressure sensors installed in the car to determine whether the control valve opening is appropriate before adjusting the control circuit, which is a relatively slow response. If, during compressor operation, impurities in the air conditioning piping system cause the valve core to become stuck, the valve flow rate will not meet the system requirements, leading to poor system cooling effect or intermittent cooling problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a variable displacement compressor control valve with signal feedback. The push rod drives the valve core to move to adjust the valve opening. The permanent magnet moves synchronously with the push rod. By detecting the change in the magnetic field of the permanent magnet, the actual opening of the valve is determined, thereby improving the controllability of the valve opening.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A variable displacement compressor control valve with signal feedback includes a valve body and a valve core. The valve core is located inside the valve body, and a valve port is formed between the two. One end of the valve body is provided with an adjustment mechanism for adjusting the valve port opening. The adjustment mechanism includes a housing connected to the valve body. The inner side of the housing is provided with a push rod for driving the valve core to move axially. One end of the push rod abuts against the valve core, and the other end is provided with a feedback component for detecting the valve port opening. The feedback component includes a permanent magnet and a detection module. The permanent magnet moves synchronously with the push rod. The detection module is used to detect changes in the magnetic field of the permanent magnet, and the detection module is located at the end of the housing away from the valve body.

[0007] Optionally, a junction box is connected to one end of the housing opposite to the valve body, and the detection module is installed inside the junction box.

[0008] Optionally, the inner side of the housing is further provided with a fixed iron core and a movable iron core that can move axially relative to the fixed iron core. One end of the push rod is fixedly connected to the movable iron core, and the other end passes through the fixed iron core and is connected to the valve core.

[0009] Optionally, a guide sleeve is provided on the outside of the fixed iron core, the closed end of the guide sleeve extends into the junction box, and the moving iron core is slidably installed in the guide sleeve.

[0010] Optionally, one end of the moving iron core is fixedly connected to a support for mounting the permanent magnet, and a second spring is sleeved on the outside of the support. One end of the second spring abuts against the moving iron core, and the other end abuts against the guide sleeve.

[0011] Optionally, a coil assembly is provided between the housing and the guide sleeve, and a closed loop for separating the coil assembly and the junction box is also provided on the outside of the guide sleeve.

[0012] Optionally, the valve body has a first channel and a second channel, and the valve core has an axial channel inside for connecting the first channel and the second channel. The valve core also has a bellows assembly for opening and closing the axial channel at the end opposite to the push rod.

[0013] Optionally, a first cavity connected to the first channel is provided inside the valve body on the side near the top rod. A third spring for resetting the valve core is provided in the first cavity, and the two ends of the third spring abut against the valve core and the first cavity, respectively.

[0014] Optionally, a second cavity connected to the first channel is provided on the side of the valve body away from the top rod, and the bellows assembly is located in the second cavity.

[0015] Optionally, the bellows assembly includes a tray and a base arranged axially opposite each other, and a bellows body disposed outside the two. The tray and the base are spaced apart by a first spring, and the base is fixedly connected to the valve body. The tray abuts against the valve core.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) In this utility model, the valve core is driven by the push rod to realize the adjustment of the valve opening. The permanent magnet moves synchronously with the push rod to generate a dynamic magnetic field. By detecting the change of the dynamic magnetic field through the detection module, the actual displacement of the push rod can be determined, thereby realizing the feedback of the actual valve opening, improving the flow control accuracy, and ensuring that the valve flow meets the standard, thus improving the cooling effect of the system. (2) In this utility model, the guide sleeve can provide a sliding guide with pressure sealing to the moving iron core, ensuring that it can move stably in the guide sleeve; (3) In this utility model, when the coil is de-energized, the first spring can ensure that the bellows assembly can be quickly reset to block the connection between the first and second channels. The third spring can ensure that the valve core can be quickly returned to its original position. The second spring can apply a pre-tightening force so that the push rod always acts on the end face of the valve core and absorbs the vibration of the valve core during operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the variable displacement compressor control valve with signal feedback in an embodiment of this utility model; Figure 2 This is a schematic diagram of the bellows assembly in an embodiment of this utility model; Wherein, 1 is the valve body; 101 is the first channel; 102 is the second channel; 103 is the third channel; 104 is the first cavity; and 105 is the second cavity. 2. Valve core; 201. Axial channel; 3. Housing; 4. Guide sleeve; 5. Fixed iron core; 6. Moving iron core; 7. Push rod; 8. Coil assembly; 9. Bellows assembly; 901. Tray; 902. Base; 903. First spring; 904. Bellows body; 10. Support; 11. Permanent magnet; 12. Second spring; 13. Junction box; 14. Detection module; 15. Box cover; 16. Closed loop; 17. Third spring. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0019] Example 1, as Figure 1 As shown, a variable displacement compressor control valve with signal feedback includes a valve body 1 and a valve core 2. The valve core 2 is located inside the valve body 1, and a valve port is formed between the two. The size of the valve port opening corresponds to the amount of gas flowing through the control valve. An adjustment mechanism and a feedback component are provided at one end of the valve body 1. The adjustment mechanism is used to adjust the valve port opening, and the feedback component is used to detect the valve port opening.

[0020] This invention controls the valve opening through an adjustment mechanism and uses a feedback component to detect the valve opening, thus determining the difference between the actual valve opening and the set opening. The data from these two measurements are then compared and fed back to the control system until the actual valve opening reaches the specified requirement. Compared to existing externally controlled electric valves, the variable displacement compressor control valve with signal feedback proposed in this invention has higher control precision, preventing the valve flow rate from falling short of system requirements, ensuring poor cooling performance, and preventing intermittent cooling problems.

[0021] The aforementioned regulating mechanism includes a housing 3 fixedly connected to the valve body 1. A guide sleeve 4 is fixedly installed on the inner side of the housing 3. A coil assembly 8 is provided between the guide sleeve 4 and the housing 3. A fixed iron core 5, a moving iron core 6, and a push rod 7 are installed on the inner side of the guide sleeve 4. The fixed iron core 5 is fixedly installed on the inner side of the guide sleeve 4 near the open end. The moving iron core 6 is slidably installed on the inner side of the guide sleeve 4 near the closed end. One end of the push rod 7 is fixedly connected to the moving iron core 6, and the other end passes through the fixed iron core 5 and abuts against the end face of the valve core 2.

[0022] The fixed iron core 5 has a through hole, and the push rod 7 slides through the through hole. When the coil of the coil assembly 8 is energized, an electromagnetic field is generated. After being enhanced by the fixed iron core 5, the electromagnetic field can attract the moving iron core 6 to move towards the fixed iron core 5, thereby driving the valve core 2 to move axially along the push rod 7 to open the valve port. When the coil is de-energized, the return spring on the valve core 2 can quickly reset the valve core 2, and drive the push rod 7 to reset through the valve core 2. The push rod 7 then drives the moving iron core 6 to reset.

[0023] Furthermore, the feedback component includes a permanent magnet 11 and a detection module 14. The permanent magnet 11 moves synchronously with the push rod 7. The detection module 14 is used to detect changes in the magnetic field of the permanent magnet 11, and the detection module 14 is located at the end of the housing 3 away from the valve body 1. A junction box 13 is connected to the end of the housing 3 opposite to the valve body 1. The closed end of the guide sleeve 4 extends into the junction box 13. The permanent magnet 11 is located inside the guide sleeve 4. The detection module 14 is installed inside the junction box 13. A closed-loop ring 16 is also provided on the outside of the guide sleeve 4 to separate the coil assembly 8 and the junction box 13.

[0024] Specifically, the permanent magnet moves synchronously with the moving iron core 6, the push rod 7, and the valve core 2, forming a dynamic magnetic field for detecting the valve opening displacement. The permanent magnet generates a magnetic field of fixed strength, which moves along with the moving iron core 6, changing the magnetic field strength on the control circuit board. The detection module 14 uses a control circuit board, which integrates a magnetic induction control chip (such as a Hall chip). The Hall chip senses the change in the magnetic field and converts it into a control signal transmitted to the air conditioning control system. At the same time, the chip on the control circuit board can compare the valve opening sent by the system with the actual valve opening and automatically adjust the valve opening to match the system requirements. If the valve core 2 fails to reach the set opening due to various reasons, the electric control valve can send an alarm signal to the system.

[0025] A support 10 is fixedly connected to the end of the moving iron core 6 away from the fixed iron core 5. The permanent magnet 11 is fixedly installed on the support 10, and the permanent magnet 11 is close to the closed end of the guide sleeve 4 so that the detection module 14 can detect the changes in its magnetic field. The valve core 2 is driven by the push rod 7 to adjust the valve opening. The permanent magnet 11 moves synchronously with the push rod 7 to generate a dynamic magnetic field. By detecting the changes in the dynamic magnetic field, the detection module 14 can determine the actual displacement of the push rod 7, thereby realizing feedback on the actual valve opening, improving control accuracy, ensuring that the valve flow rate meets the standard, and improving the cooling effect of the system.

[0026] The junction box 13 is connected to the compressor wiring harness externally and houses the control circuit board internally. The cover 15 is located on the top of the junction box 13 and can seal the circuit board inside the junction box 13 to isolate it from the outside. The control circuit board here is used to receive the valve opening command transmitted by the air conditioning system and convert it into control current. At the same time, it senses the change in magnetic field generated by the downward displacement of the moving iron core 6, determines whether the valve opening meets the requirements and automatically fine-tunes it, and feeds back the valve opening information to the air conditioning system. If the valve cannot be adjusted, it sends an error signal to the system.

[0027] Furthermore, the guide sleeve 4 provides a pressure-sealed sliding guide for the moving iron core 6, ensuring its stable movement within the guide sleeve 4. A second spring 12 is fitted onto the outer side of the support 10, with one end of the second spring 12 abutting against the moving iron core 6 and the other end abutting against the guide sleeve 4. The second spring 12 applies a preload, ensuring that the push rod 7 always acts on the end face of the valve core 2 and absorbs vibrations during valve core 2 operation.

[0028] In Example 2, based on Example 1, this utility model also proposes a specific structure for the valve body 1 and the valve core 2.

[0029] like Figure 1 and Figure 2 As shown, the valve body 1 is internally provided with a valve core 2 and a bellows assembly 9. The valve body 1 has a first channel 101, a second channel 102 and a third channel 103. The valve core 2 has an axial channel 201 for connecting the first channel 101 and the second channel 102. The third channel 103 is located between the first channel 101 and the second channel 102. The bellows assembly 9 is located at one end of the valve core 2 opposite to the push rod 7, and the bellows assembly 9 is used to control the opening and closing of the axial channel 201.

[0030] The valve body 1, together with the valve core 2 and the bellows assembly 9, forms three pressure spaces: upper, middle and lower. It also forms a valve port with the valve core 2, which is located between the upper part of the valve core 2 and the first channel 101. The bellows assembly 9, as a pressure-sensing component, adjusts the length of the bellows body 904 by sensing the pressure of the suction chamber Ps acting on the upper end of the bellows, and automatically adjusts the valve port opening.

[0031] The first channel 101 is used to connect the valve body 1 and the intake chamber Ps, the second channel 102 is used to connect the valve body 1 and the swing chamber Pc, and the third channel 103 is used to connect the valve body 1 and the exhaust chamber Pd. When the solenoid valve is energized, under the action of the push rod 7, the valve core 2 moves downward, and the upper end of the valve core 2 is separated from the lower end conical surface of the fixed iron core 5. The gas in the intake chamber Ps enters the middle part of the valve core 2 from the upper end of the valve core 2 and reaches the upper end cavity of the bellows assembly 9. This air pressure can cause the axial dimension of the bellows assembly 9 to change.

[0032] Specifically, a second cavity 105 connected to the first channel 101 is provided on the side of the valve body 1 away from the push rod 7, and the bellows assembly 9 is located in the second cavity 105. The bellows assembly 9 includes a tray 901, a base 902, a bellows body 904, and a first spring 903. The tray 901 and the base 902 are arranged opposite each other along the axial direction and are spaced apart by the first spring 903. The bellows body 904 is located on the outside of the two, that is, one end of the bellows body 904 is connected to the tray 901 and the other end is connected to the base 902. The base 902 is fixedly connected to the valve body 1. The tray 901 abuts against the valve core 2. The upper end of the tray 901 has a cavity, and the lower end conical surface of the valve core 2 is embedded in the cavity.

[0033] The control valve disclosed in this utility model moves the valve core 2 inside the valve body 1 to adjust the valve port size, change the flow and pressure from the exhaust chamber Pd to the swing chamber Pc, thereby changing the swashplate angle inside the compressor and realizing variable displacement control.

[0034] Furthermore, a first cavity 104 connected to the first channel 101 is provided inside the valve body 1 on the side near the push rod 7. A third spring 17 for resetting the valve core 2 is provided inside the first cavity 104, with its two ends abutting against the valve core 2 and the first cavity 104, respectively. When the coil is de-energized, the first spring 903 ensures that the bellows assembly 9 can quickly reset to block the connection between the first channel 101 and the second channel 102, while the third spring 17 ensures that the valve core 2 can quickly return to its original position.

[0035] In summary, this invention proposes a variable displacement compressor control valve with signal feedback. A permanent magnet is added to the upper end of the moving iron core 6, and a chip capable of sensing changes in the position of the permanent magnet and a related control circuit board are added to the upper end of the coil assembly 8. Since the permanent magnet 11 is fixedly connected to the moving iron core 6, when the electromagnetic coil is energized, the moving iron core 6 displaces downwards. This displacement is transmitted to the valve core 2 via the push rod 7. The displacement of the valve core 2 is the same as the displacement of the permanent magnet 11. The change in the magnetic field caused by the displacement of the permanent magnet is sensed by the chip on the control circuit board and transmitted to the automotive air conditioning control system, ensuring the stability of the main valve outlet flow rate under the set current. This control valve structure can directly output the displacement of the valve core 2 as a signal, facilitating the air conditioning system's identification of the actual working state of the electronically controlled valve outlet, enabling precise flow control and fault alarm functions.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A variable displacement compressor control valve with signal feedback, comprising a valve body and a valve core, wherein the valve core is located inside the valve body and a valve port is formed between the two, characterized in that: One end of the valve body is provided with an adjustment mechanism for adjusting the valve opening. The adjustment mechanism includes a housing connected to the valve body. The inner side of the housing is provided with a push rod for driving the valve core to move axially. One end of the push rod abuts against the valve core, and the other end is provided with a feedback component for detecting the valve opening. The feedback component includes a permanent magnet and a detection module. The permanent magnet moves synchronously with the push rod. The detection module is used to detect changes in the magnetic field of the permanent magnet, and the detection module is located at the end of the housing away from the valve body.

2. The variable displacement compressor control valve with signal feedback according to claim 1, characterized in that: A junction box is connected to one end of the housing opposite to the valve body, and the detection module is installed inside the junction box.

3. The variable displacement compressor control valve with signal feedback according to claim 2, characterized in that: The inner side of the housing is also provided with a fixed iron core and a movable iron core that can move axially relative to the fixed iron core. One end of the push rod is fixedly connected to the movable iron core, and the other end passes through the fixed iron core and is connected to the valve core.

4. The variable displacement compressor control valve with signal feedback according to claim 3, characterized in that: The fixed iron core is provided with a guide sleeve on its outer side, the closed end of the guide sleeve extends into the junction box, and the moving iron core is slidably installed in the guide sleeve.

5. The variable displacement compressor control valve with signal feedback according to claim 4, characterized in that: One end of the moving iron core is fixedly connected to a support for mounting the permanent magnet. A second spring is sleeved on the outside of the support. One end of the second spring abuts against the moving iron core, and the other end abuts against the guide sleeve.

6. The variable displacement compressor control valve with signal feedback according to claim 5, characterized in that: A coil assembly is disposed between the housing and the guide sleeve, and a closed loop for separating the coil assembly and the junction box is also disposed on the outside of the guide sleeve.

7. The variable displacement compressor control valve with signal feedback according to any one of claims 1-6, characterized in that: The valve body has a first channel and a second channel, and the valve core has an axial channel inside for connecting the first channel and the second channel. The valve core also has a bellows assembly for opening and closing the axial channel at the end opposite to the push rod.

8. The variable displacement compressor control valve with signal feedback according to claim 7, characterized in that: The valve body has a first cavity connected to the first channel on the side near the top rod. The first cavity is provided with a third spring for resetting the valve core. The two ends of the third spring abut against the valve core and the first cavity, respectively.

9. The variable displacement compressor control valve with signal feedback according to claim 8, characterized in that: The valve body has a second cavity connected to the first channel on the side away from the top rod, and the bellows assembly is located in the second cavity.

10. The variable displacement compressor control valve with signal feedback according to claim 9, characterized in that: The bellows assembly includes a tray and a base arranged axially opposite each other, and a bellows body disposed on the outside of the two. The tray and the base are spaced apart by a first spring, and the base is fixedly connected to the valve body. The tray abuts against the valve core.

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