An adjustable piston variable displacement compressor

Abstract

The application discloses an adjustable piston variable displacement compressor, which comprises an exhaust one-way valve, a spring and a valve core are arranged in the valve body of the exhaust one-way valve, the spring drives the valve core to move to change the opening degree of the valve port, a connector for externally connecting a control current is connected to the lower end of the valve body, an electromagnetic assembly is arranged in the valve body below the spring, the electromagnetic assembly comprises a position coil, a moving iron core and a fixed iron core, the coil is arranged on the outer periphery of the fixed iron core and is electrically connected with the connector, the fixed iron core is located above the moving iron core, vertical inner holes are arranged in the middle portions of the moving iron core and the fixed iron core, a valve rod is arranged in the inner holes, the upper end of the valve rod passes through the inner hole of the fixed iron core and is in sliding fit with the fixed iron core, the lower end of the valve rod is fixedly connected with the moving iron core, a valve cap for upward pushing the spring is arranged on the top of the valve rod, and a gap is formed between the moving iron core and the fixed iron core when the connector is not electrified; when the connector is electrified, the electromagnetic force of the coil drives the moving iron core to upward push the valve cap with the valve rod, so that the spring is compressed and upward pushes the valve core.

Description

Technical Field

[0001] This invention relates to an adjustable piston variable displacement compressor, belonging to the technical field of automotive air conditioning compressors. Background Technology

[0002] Variable displacement reciprocating compressors are a common type of compressor used in automotive air conditioning systems. When the ambient temperature is high, the compressor's displacement can be increased, thus increasing its cooling capacity; conversely, when the ambient temperature is low, the compressor's displacement can be decreased, thus reducing its cooling capacity. Automotive air conditioning systems using this type of compressor experience less temperature fluctuation at the air outlet, improving cooling efficiency and reducing fuel consumption.

[0003] The structure of this type of piston variable displacement compressor in the prior art is as follows: Figures 1 to 2 As shown, the exhaust check valve 2 is installed in the compressor's exhaust passage 11. The exhaust check valve 2 includes a valve body 22 and a valve seat 21. The valve seat 21 has an intake chamber that communicates with the compressor's exhaust chamber. The valve body 22 has a valve port 24 that connects the intake chamber and the compressor's exhaust port. The valve body 22 has a spring 25 and a valve core 29 located at the upper end of the spring. The spring drives the valve core 29 to move up and down, changing the opening degree of the valve port 24. Since the compressor's exhaust passage contains an exhaust check valve, the purpose of this part is to reduce exhaust pulsation and lower the air conditioning compressor's compression rate. The noise during operation of the compressor is relatively high, but the exhaust check valve of this type of compressor is all spring mechanically opened, which will cause two problems: (1) In the summer when the temperature is high, the compressor operates at a large displacement, and the refrigerant flow through the check valve is large. If the spring stiffness is small, it cannot provide enough damping to reduce the compressor exhaust pulsation, thus producing a "da da da" working sound; (2) In the winter when the temperature is low, the compressor operates at a small displacement, and the refrigerant flow through the check valve is small. If the spring stiffness is large, the valve opening of the check valve is small, and a "woo woo woo" whistling sound is easily produced.

[0004] The spring stiffness of the one-way valve in the existing piston variable displacement compressor cannot be adjusted, so it cannot simultaneously meet the two working states of large displacement and small displacement of the compressor. While solving one type of working noise, another type of working noise will appear. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustable piston variable displacement compressor to solve the technical problem that the spring stiffness of the one-way valve in the prior art piston variable displacement compressor cannot be adjusted, which leads to the inability to solve the working noise problem when the compressor is working in large displacement and small displacement states.

[0006] This invention adopts the following technical solution: an adjustable piston variable displacement compressor, comprising an exhaust check valve disposed within the compressor exhaust passage, the exhaust check valve comprising a valve body and a valve seat disposed vertically, the valve seat having an intake chamber communicating with the compressor exhaust chamber, the valve body having a valve port on its side communicating with the intake chamber and the compressor exhaust port, the valve body having a spring and a valve core disposed at the upper end of the spring, the spring driving the valve core to move up and down to change the valve port opening, the lower end of the valve body being connected to a connector for external control current, the valve body having an electromagnetic component disposed below the spring, the electromagnetic component comprising a coil, a moving iron core, and a fixed iron core disposed within the valve body, the coil being disposed outside the fixed iron core. The valve body is electrically connected to the connector. The fixed iron core is positioned above the moving iron core and is fixedly connected to the valve body. Both the moving and fixed iron cores have vertically arranged inner holes in their middle sections. A valve stem is installed in the inner hole. The upper end of the valve stem passes through the inner hole of the fixed iron core and slides with the fixed iron core. The lower end of the valve stem is fixed in the inner hole of the moving iron core. A valve cap is provided at the top of the valve stem. An annular base is provided at the bottom of the valve cap. The upper part of the valve cap is inserted into the spring. The lower end of the spring presses against the annular base. When the connector is not energized, there is a gap between the moving and fixed iron cores. When the connector is energized, the coil generates electromagnetic force, and the moving iron core drives the valve stem to push the valve cap upward, compressing the spring and pushing the valve core upward.

[0007] The bottom surface of the valve cap has a groove, and the upper end of the valve stem rests in the groove.

[0008] The valve core has an annular boss located above the coil, and the coil is fixed between the annular boss and the connector.

[0009] The annular boss is integrally connected to the inside of the valve body.

[0010] The top of the fixed iron core is provided with an annular outer edge, the bottom surface of the annular outer edge of the fixed iron core is pressed against the top surface of the annular boss, and the circumferential surface of the fixed iron core located below the annular outer edge is fixedly connected to the inner surface of the annular step.

[0011] The bottom of the fixed iron core is a concave structure that tapers upwards, and the top of the moving iron core is a convex structure that tapers upwards. The concave structure of the fixed iron core and the convex structure of the moving iron core are matched and fitted together.

[0012] The valve body includes a valve cover and a seat. The valve cover is connected to the upper part of the seat. The valve port is opened on the valve cover. The outer periphery of the valve core slides in fit with the inner wall of the valve cover.

[0013] The lower part of the compressor's exhaust passage is provided with a retaining ring, the upper part of the connector is fixedly connected to the retaining ring, and the lower end of the connector protrudes from the exhaust passage.

[0014] The valve seat is provided with a first sealing ring that seals with the compressor exhaust passage, the valve body is provided with a second sealing ring that seals with the compressor exhaust passage, and the connector is provided with a third sealing ring that seals with the compressor exhaust passage.

[0015] The valve core adopts a cap-type structure with a closed top and an open bottom, and the upper end of the spring is fixedly connected to the top surface inside the valve core.

[0016] The beneficial effects of the present invention are as follows: The present invention sets an electromagnetic component inside the exhaust check valve. The coil of the electromagnetic component is energized through a connector. After the coil is energized, it generates an electromagnetic force. The moving iron core is driven by the electromagnetic force, thereby driving the valve stem to move upward. When the valve cap moves upward, the valve opening becomes smaller. In high-temperature environments, when the compressor operates at a high displacement, a large current can be input to the exhaust check valve via the connector. When the coil is energized, a large electromagnetic force is generated, pushing the moving iron core and valve stem assembly a greater distance towards the valve cap. This results in greater compression of the spring, leading to a smaller valve opening. As the gas in the exhaust chamber passes through the exhaust check valve, it experiences greater damping, thus reducing the "ticking" noise during compressor operation. In low-temperature environments, when the compressor operates at a low displacement, a small current can be input to the electromagnetic check valve. When the coil is energized, a smaller electromagnetic force is generated, pushing the moving iron core and valve stem assembly a smaller distance towards the valve cap. This results in less compression of the spring, allowing for a larger valve opening. When the gas in the exhaust chamber passes through the exhaust check valve, it experiences less damping, thus avoiding the "whistling" sound at a small valve opening.

[0017] Compared with existing technologies, this invention allows the opening degree of the exhaust check valve to be adjusted accordingly based on the compressor displacement. This can eliminate the "click-click-click" working noise of the compressor under high flow rate in high-temperature environments, as well as the "whistling" noise of the compressor under low flow rate in low-temperature environments, thus optimizing the compressor design and improving driving and riding comfort. Attached Figure Description

[0018] Figure 1 This is an external view of a conventional piston variable displacement compressor;

[0019] Figure 2 yes Figure 1 A partial sectional view of section A at the central exhaust passage;

[0020] Figure 3 This is an external view of an adjustable piston variable displacement compressor according to an embodiment of the present invention;

[0021] Figure 4 yes Figure 3 A partial cross-sectional view of the central exhaust passage;

[0022] Figure 5 yes Figure 4 An enlarged view of the exhaust check valve.

[0023] In the diagram: 1-Compressor rear cover, 11-Exhaust passage, 12-Exhaust port, 2-Exhaust check valve, 21-Valve seat, 22-Valve body, 221-Annular boss, 23-Valve cover, 24-Valve port, 25-Spring, 26-Connector, 27-Electromagnetic assembly, 271-Coil, 272-Moving iron core, 273-Fixed iron core, 274-Valve stem, 275-Valve cap, 281-First sealing ring, 282-Second sealing ring, 283-Third sealing ring, 29-Valve core, 3-Retaining ring. Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 3 to 5 As shown, an adjustable piston variable displacement compressor according to an embodiment of the present invention includes an exhaust one-way valve 2 disposed in an exhaust passage 11 in the rear cover 1 of the compressor. The exhaust one-way valve 2 includes a valve body 22 and a valve seat 21 disposed vertically. The valve seat 21 has an intake chamber that communicates with the exhaust chamber of the compressor. The side of the valve body 22 has a valve port 24 that connects the intake chamber and the exhaust port 12 of the compressor. The valve body 22 has a spring 25 and a valve core 29 disposed on the upper end of the spring 25. The spring 25 drives the valve core 29 to move up and down to change the opening degree of the valve port 24. The valve core 29 adopts a cap-type structure with a closed top and an open bottom. The upper end of the spring 25 is fixedly connected to the top surface inside the valve core 29.

[0026] The lower end of the valve body 22 is connected to a connector 26 for external control current. An electromagnetic assembly 27 is located inside the valve body 22, below the spring 25. The electromagnetic assembly 27 includes a coil 271, a moving iron core 272, and a fixed iron core 273 located within the valve body. The coil 271 is disposed on the outer periphery of the fixed iron core 273 and electrically connected to the connector 26. The fixed iron core 273 is disposed above the moving iron core 272 and fixedly connected to the valve body 22. The middle portions of both the moving iron core 272 and the fixed iron core 273 are... The connector 26 has a vertically oriented inner hole, within which a valve stem 274 is installed. The upper end of the valve stem 274 passes through the inner hole of the fixed iron core 273 and slides within it. The lower end of the valve stem 274 is fixed within the inner hole of the moving iron core 272, with an interference fit between the valve stem 274 and the inner hole of the moving iron core 272. A valve cap 275 is located at the top of the valve stem 274, and an annular base is located at the bottom of the valve cap 275. The upper part of the valve cap 275 is inserted into the spring 25, and the lower end of the spring 25 presses against the annular base. When the connector 26 is not energized, there is a gap between the moving iron core 273 and the fixed iron core 273. When the connector 26 is energized, the coil 271 generates electromagnetic force, causing the moving iron core 273 to drive the valve stem 274 to push the valve cap 275 upward, compressing the spring 25 and pushing the valve core 29 upward.

[0027] In this embodiment, the valve body 22 includes a valve cover 23 and a seat. The valve cover 23 is connected to the upper part of the seat, and the valve port 24 is opened on the valve cover 23. The outer periphery of the valve core 29 slides in cooperation with the inner wall of the valve cover 23. The electromagnetic component is installed inside the seat. A retaining ring 3 is provided in the lower part of the exhaust passage 11 of the compressor. The upper part of the connector 26 is fixedly connected to the retaining ring 3, and the lower end of the connector 26 protrudes from the exhaust passage 11.

[0028] A groove is formed on the bottom surface of the valve cap 275, and the upper end of the valve stem 274 rests in the groove. An annular boss 221 is provided inside the valve core 29 above the coil 271. The coil 29 is fixed between the annular boss 221 and the connector 26, and the annular boss 221 is connected to the inside of the valve body. The upper end of the fixed iron core 273 has an annular outer edge. The bottom surface of the annular outer edge of the fixed iron core 273 presses against the top surface of the annular boss 221, and the outer circumferential surface of the fixed iron core 273 below the annular outer edge is fixedly connected to the inner surface of the annular boss 221.

[0029] The bottom of the fixed iron core 273 is a concave structure that tapers upwards, and the top of the moving iron core 272 is a convex structure that tapers upwards. The concave structure of the fixed iron core 273 and the convex structure of the moving iron core 272 fit together. The valve seat 21 is provided with a first sealing ring 281 that seals with the compressor exhaust passage. The valve body 22 is provided with a second sealing ring 282 that seals with the compressor exhaust passage. The connector 26 is provided with a third sealing ring 283 that seals with the compressor exhaust passage.

[0030] The adjustable variable displacement compressor of this embodiment is an externally controlled variable displacement compressor. The invention includes an adjustable exhaust check valve 2 within the exhaust passage 11. Figure 2 As shown, the compressed gas enters the exhaust port 12 from the exhaust chamber through the exhaust check valve 2. The exhaust check valve 2 is installed in the compressor rear cover 1 through the retaining ring 3, with an exposed connector 26 that can be connected to the vehicle control unit. By controlling the input current value under high and low temperature environments through different electrical signals, the opening force of the exhaust check valve 2 can be adjusted. The connector 26 can be connected to an external control current and is also connected to the valve body 22. The moving iron core 272 is fixedly connected to the valve stem 274. After the coil 271 is energized, under the action of electromagnetic force, the valve stem 274 can slide in the inner hole of the fixed iron core 273, while pushing the valve cap 275 to slide up and down, further pre-compressing the spring 25, thereby changing the threshold for opening the valve core 2.

[0031] In high-temperature environments, the compressor operates at a large displacement. At this time, a large current can be input to the exhaust check valve through the connector. After the coil 271 is energized, a large electromagnetic force is generated, which pushes the combination of the moving iron core 272 and the valve stem 274 a large distance towards the valve cap 275, thereby generating a larger compression on the spring 25. At this time, the valve port 24 is open at a small degree. When the gas in the exhaust chamber passes through the exhaust check valve 2, it will feel a greater damping effect, which can reduce the "ticking" noise when the compressor is working.

[0032] In low-temperature environments, the compressor operates at a small displacement. At this time, a small current can be input into the electromagnetic check valve 2. After the coil 271 is energized, a small electromagnetic force is generated, which pushes the combination of the moving iron core 272 and the valve stem 274 a small distance towards the valve cap 25. This generates a small amount of compression on the spring 25, allowing the valve port 24 to open more. At this time, when the gas in the exhaust chamber passes through the exhaust check valve 2, the damping it experiences is small, thus avoiding the "whistling" sound at a small valve port opening.

[0033] For externally controlled variable displacement compressors, the connector of the discharge check valve can be connected in parallel with the connector of the external control valve, with the same input current. The control logic is as follows:

[0034] High temperature environment → The compressor needs to work with a large displacement → The whole vehicle inputs a large current to the external control valve → At the same time, this current is synchronously input to the solenoid check valve → The check valve generates a large damping, thereby reducing the "click-click-click" working noise.

[0035] Low temperature environment → the compressor needs to operate with a small displacement → the whole vehicle inputs a small current to the external control valve → at the same time, this current is synchronously input to the solenoid check valve → the check valve generates a small damping → the valve opening is larger → to avoid producing a "whistling" sound.

[0036] For internally controlled variable displacement compressors, the input current of the exhaust check valve needs to be externally input. This can be achieved by sensing the ambient temperature of the vehicle, outputting a large current at high temperatures and a small current at low temperatures, which is then supplied to the electromagnetic components of the exhaust check valve, thereby achieving the above-mentioned noise reduction effect.

[0037] This invention utilizes an adjustable exhaust check valve, which can actively adjust the spring compression degree according to different compressor displacements, thereby achieving the effect of reducing compressor operating noise under various compressor operating conditions.

[0038] The embodiments and descriptions above are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable piston variable displacement compressor, comprising an exhaust check valve disposed within the compressor exhaust passage, the exhaust check valve comprising a valve body and a valve seat disposed vertically, the valve seat having an intake chamber communicating with the compressor exhaust chamber, the valve body having a valve port on its side communicating with the intake chamber and the compressor exhaust port, the valve body having a spring and a valve core disposed at the upper end of the spring, the spring driving the valve core to move vertically to change the valve port opening, characterized in that: The lower end of the valve body is connected to a connector for external control current. An electromagnetic assembly is located inside the valve body below the spring. The electromagnetic assembly includes a coil, a moving iron core, and a fixed iron core located within the valve body. The coil is positioned on the outer periphery of the fixed iron core and electrically connected to the connector. The fixed iron core is positioned above the moving iron core and fixedly connected to the valve body. Both the moving and fixed iron cores have vertically oriented inner holes in their middle sections. A valve stem is positioned within each inner hole. The upper end of the valve stem extends through the inner hole of the fixed iron core and slides within it. The lower end of the valve stem is fixed within the inner hole of the moving iron core. A valve cap is located at the top of the valve stem, and an annular base is located at the bottom of the valve cap. The upper part of the valve cap is inserted into the spring, and the lower end of the spring presses against the annular base. When the connector is not energized, there is a gap between the moving iron core and the fixed iron core. When the connector is energized, the coil generates electromagnetic force, and the moving iron core drives the valve stem to push the valve cap upward, compressing the spring and pushing the valve core upward. When the compressor is running at a large displacement, the connector inputs a large current to the exhaust check valve, and the coil generates a large electromagnetic force, pushing the combination of the moving iron core and the valve stem a large distance towards the valve cap. When the compressor is running at a small displacement, it inputs a small current to the electromagnetic check valve, and the coil generates a small electromagnetic force, pushing the combination of the moving iron core and the valve stem a small distance towards the valve cap.

2. The adjustable piston variable displacement compressor according to claim 1, characterized in that: The bottom surface of the valve cap has a groove, and the upper end of the valve stem rests in the groove.

3. The adjustable piston variable displacement compressor according to claim 1, characterized in that: The valve body has an annular boss located above the coil, and the coil is fixed between the annular boss and the connector.

4. The adjustable piston variable displacement compressor according to claim 3, characterized in that: The annular boss is integrally connected to the inside of the valve body.

5. The adjustable piston variable displacement compressor according to claim 3, characterized in that: The top of the fixed iron core is provided with an annular outer edge, the bottom surface of the annular outer edge of the fixed iron core is pressed against the top surface of the annular boss, and the circumferential surface of the fixed iron core located below the annular outer edge is fixedly connected to the inner surface of the annular step.

6. The adjustable piston variable displacement compressor according to claim 1, characterized in that: The bottom of the fixed iron core is a concave structure that tapers upwards, and the top of the moving iron core is a convex structure that tapers upwards. The concave structure of the fixed iron core and the convex structure of the moving iron core are matched and fitted together.

7. The adjustable piston variable displacement compressor according to claim 1, characterized in that: The valve body includes a valve cover and a seat. The valve cover is connected to the upper part of the seat. The valve port is opened on the valve cover. The outer periphery of the valve core slides in fit with the inner wall of the valve cover.

8. The adjustable piston variable displacement compressor according to claim 1, characterized in that: The lower part of the compressor's exhaust passage is provided with a retaining ring, the upper part of the connector is fixedly connected to the retaining ring, and the lower end of the connector protrudes from the exhaust passage.

9. The adjustable piston variable displacement compressor according to claim 1, characterized in that: The valve seat is provided with a first sealing ring that seals with the compressor exhaust passage, the valve body is provided with a second sealing ring that seals with the compressor exhaust passage, and the connector is provided with a third sealing ring that seals with the compressor exhaust passage.

10. The adjustable piston variable displacement compressor according to claim 1, characterized in that: The valve core adopts a cap-type structure with a closed top and an open bottom, and the upper end of the spring is fixedly connected to the top surface inside the valve core.

Images