Pulse suppression mechanism and variable displacement compressor

Abstract

The utility model discloses a pulse suppression mechanism and a variable displacement compressor, belongs to the technical field of compressors, and aims to solve the problem that the exhaust pulse of the variable displacement compressor causes poor running stability of a system. According to the technical scheme, a high-pressure cavity is formed in the center of the inner side of a rear cover, a low-pressure cavity surrounding the high-pressure cavity and isolated from the high-pressure cavity is formed in the circumferential direction of the high-pressure cavity, and the low-pressure cavity is an air inlet area; the inner wall of the rear cover is provided with a first exhaust channel extending in the radial direction from the first exhaust port. A second exhaust channel is formed in the inner wall of the rear cover, the communication position of the second exhaust channel and the first exhaust channel is located on the side wall of the rear cover, and the end, away from the first exhaust channel, of the second exhaust channel penetrates through the rear cover to form a second exhaust port. Not only is the pulse phenomenon during exhaust reduced, but also the noise level during the operation of the variable displacement compressor can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, and more particularly to a pulse suppression mechanism and a variable displacement compressor. Background Art

[0002] In automotive air-conditioning and refrigeration systems, variable-displacement compressors change their displacement by automatically adjusting the swash plate angle to adapt to changes in external load. This adjustment mechanism can effectively control the output cooling capacity of the refrigerant, thereby maintaining the stability of the system temperature, reducing temperature fluctuations caused by frequent switching of the variable-displacement compressor, and eliminating the jamming phenomenon caused by sudden changes in engine load. Therefore, variable-displacement compressors are widely used.

[0003] The variable displacement compressor compresses the refrigerant by driving the piston through the main shaft swash plate assembly, and realizes the suction and exhaust process by opening and closing the suction and exhaust valve plates. However, since the suction and exhaust processes are carried out alternately, suction and exhaust pulses are inevitably generated, which in turn affects the smooth operation of the system and the comfort of the passengers. As consumers' requirements for comfort increase, reducing the exhaust pulse has become a key indicator for improving the supporting performance of the variable displacement compressor. Therefore, a new solution is needed to solve the problem of the exhaust pulse of the variable displacement compressor causing the smooth operation of the system. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a pulse suppression mechanism and a variable displacement compressor, which can reduce the exhaust pulse of the displacement compressor and improve the stability of the system operation through the structural setting.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: the pulse suppression mechanism includes a rear cover, a high-pressure chamber is opened at the center of the inner side of the rear cover, and a first exhaust port is opened on the bottom wall of the high-pressure chamber;

[0006] A low-pressure chamber is provided in the circumferential direction of the high-pressure chamber, surrounding the high-pressure chamber and isolated from the high-pressure chamber, and the low-pressure chamber is an air inlet area;

[0007] A first exhaust passage extending radially from the first exhaust port is provided on the inner wall of the rear cover;

[0008] A second exhaust channel is provided on the inner wall of the rear cover. The connection between the second exhaust channel and the first exhaust channel is located on the side wall of the rear cover. One end of the second exhaust channel away from the first exhaust channel passes through the rear cover to form a second exhaust port.

[0009] The present invention is further configured as follows: a one-way exhaust valve is provided in the first exhaust port, and the exhaust end of the one-way exhaust valve is communicated with the first exhaust channel.

[0010] The utility model is further configured as follows: one end of the first exhaust channel away from the first exhaust port passes through the back cover and is connected to the outside world; the end of the first exhaust channel connected to the outside world is a mounting port; the mounting port is detachably connected to a pressure relief valve; and the distance between the second exhaust channel and the outer wall of the back cover is greater than the thickness of the outer wall of the back cover.

[0011] The present invention is further configured as follows: a plurality of buffer chambers communicating with the high-pressure chamber are provided in the circumferential direction of the high-pressure chamber.

[0012] The present invention is further configured such that the centers of the high-pressure chamber and the first exhaust port coincide with each other.

[0013] The present invention is further configured such that: the first exhaust port is a conical structure.

[0014] The utility model also discloses a variable displacement compressor, comprising a cylinder body and the pulse suppression mechanism described in any one of the above items, wherein the cylinder body is sealed by a rear cover.

[0015] The utility model is further configured as follows: an air intake channel is opened on the peripheral wall of the cylinder body, and the air intake channel is communicated with the low-pressure chamber.

[0016] The present invention is further configured such that: the second exhaust passage and the air intake passage are staggered and arranged in the same direction.

[0017] In summary, the present invention has the following beneficial effects:

[0018] By placing the high-pressure chamber in the center of the rear cover and increasing its volume, it can store more high-pressure gas, which not only helps to reduce the pulse phenomenon during exhaust, but also effectively reduces the noise level of the variable displacement compressor during operation.

[0019] 1. The first exhaust channel is equipped with a one-way valve and a pressure relief valve. Gas can only flow into the first exhaust channel in one direction through the one-way exhaust valve. The first exhaust channel runs through the rear cover so that the installation port of the pressure relief valve is located outside the rear cover for easy operation and removal of the pressure relief valve. When the gas pressure in the high-pressure chamber exceeds the set threshold, the pressure relief valve can open in time to release excess pressure, ensuring that the variable displacement compressor operates within a safe working pressure range, thereby improving overall safety and reliability.

[0020] 2. The buffer chamber opened in the circumferential direction around the high-pressure chamber slows down the exhaust pulse. The buffer chamber is connected to the high-pressure chamber and can effectively buffer the compressed gas, thereby further stabilizing the pressure output and reducing the exhaust pulse.

[0021] 3. The low-pressure chamber surrounds the high-pressure chamber and is located close to the intake channel, which helps shorten the gas intake path and improve intake efficiency. At the same time, since the high-pressure chamber is located in the center, the distance from the compression chamber to the high-pressure chamber is shortened, which helps to quickly process the exhaust pulse and improve the overall response speed and efficiency of the variable displacement compressor.

[0022] 4. Reducing exhaust pulses not only reduces energy loss caused by pulses and improves the efficiency of variable displacement compressors, but also helps reduce temperature rise during the exhaust process, further optimizing cooling requirements and extending equipment life.

[0023] 5. In addition, reducing exhaust pulses can also avoid resonance in the exhaust system pipes and reduce fatigue damage to pipes and accessories caused by excessive stress, thereby improving system reliability. At the same time, reducing fuselage resonance also helps to improve the reliability of variable displacement compressors and the service life of supporting structures.

[0024] Through the above improvements, the variable displacement compressor can efficiently and stably complete the gas intake, compression and discharge processes, which not only reduces the exhaust pulse and improves the working efficiency of the variable displacement compressor, but also enhances the stability and safety of the equipment, thereby improving the smoothness of the system operation and ensuring a longer operating life and more reliable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the utility model;

[0026] Figure 2 This is a cross-sectional view of the utility model Figure 1 ;

[0027] Figure 3 This is a cross-sectional view of the utility model Figure 2 ;

[0028] Figure 4 This is an enlarged view of point A in the figure;

[0029] Figure 5 It is a structural schematic diagram of the installation port in the utility model.

[0030] In the figure: 1. rear cover; 2. high-pressure chamber; 3. low-pressure chamber; 4. first exhaust port; 5. first exhaust channel; 6. second exhaust channel; 7. second exhaust port; 8. mounting port; 9. buffer chamber; 10. air intake channel. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Example

[0032] like Figure 1-Figure 3 As shown, the variable displacement compressor includes a cylinder body and a pulse suppression mechanism. A compression chamber is provided in the cylinder body, which is sealed by a rear cover 1. The pulse suppression mechanism includes an aluminum rear cover 1. An air intake passage 10 is provided on the outer peripheral wall of the cylinder body. A high-pressure chamber 2 is provided at the center position of the inner side of the rear cover 1. A low-pressure chamber 3 surrounding the high-pressure chamber 2 and isolated from the high-pressure chamber 2 is provided in the circumferential direction of the high-pressure chamber 2. The low-pressure chamber 3 is connected with the air intake passage 10. The gas in the low-pressure chamber 3 enters the high-pressure chamber 2 after being compressed in the compression chamber. The low-pressure chamber 3 is close to the air intake passage 10, which can shorten the air intake path and improve the air intake efficiency. The high-pressure chamber 2 is provided in the middle position, and the distance between the compression chamber and the high-pressure chamber 2 is also reduced, which can shorten the distance for the gas to enter the high-pressure chamber 2, and is more efficient. In order to reduce the exhaust pulse, a first exhaust port 4 is provided on the bottom cavity wall of the high-pressure chamber 2. The centers of the high-pressure chamber 2 and the first exhaust port 4 coincide with each other, which can reduce the pressure difference between different areas of the high-pressure chamber 2 and further reduce the exhaust pulse. A one-way exhaust valve is installed in the first exhaust port 4. The first exhaust port 4 has a conical structure, which is convenient for fixing the one-way exhaust valve in the first exhaust port 4 of the conical structure and ensuring the stability of the installation of the one-way exhaust valve. A first exhaust channel 5 radially extending from the first exhaust port 4 is formed on the inner wall of the rear cover 1 by casting and finishing. The exhaust end of the one-way exhaust valve is connected to the first exhaust channel 5 to ensure that the gas can only flow in one direction. The gas enters the first exhaust channel 5 through the one-way exhaust valve, thereby reducing the exhaust pulse.

[0033] like Figure 2-Figure 3As shown, a second exhaust channel 6 is opened on the inner wall of the rear cover 1 through casting and finishing, and the connection between the second exhaust channel 6 and the first exhaust channel 5 is located on the side wall of the rear cover 1. One end of the two exhaust channels away from the first exhaust channel 5 passes through the rear cover 1 to form a second exhaust port 7, and the end of the first exhaust channel 5 away from the first exhaust port 4 passes through the rear cover 1 to communicate with the outside world. The end of the first exhaust channel 5 connected to the outside world is a mounting port 8, and the pressure relief valve is installed on the rear cover 1 through the mounting port 8. The first exhaust channel 5 passes through the rear cover 1 to communicate with the outside world, which facilitates the operation and unloading of the pressure relief valve. The distance between the second exhaust channel 6 and the outer wall is greater than the thickness of the outer wall of the rear cover 1, so as to avoid the situation where the second exhaust channel 6 malfunctions and the pressure relief valve malfunctions. When the gas pressure in the high-pressure chamber 2 is greater than the set threshold, the pressure can be relieved in time through the pressure relief valve, thereby improving the safety and reliability of the variable displacement compressor and increasing the structural strength of the second exhaust channel 6.

[0034] like Figure 2 and Figure 4 As shown, six buffer chambers 9 connected to the high-pressure chamber 2 are provided in the circumferential direction of the high-pressure chamber 2. The buffer chambers 9 are provided in a circular array in the rear cover 1. By setting up a number of buffer chambers 9, the gas in the high-pressure chamber 2 can be effectively buffered, and the exhaust pulse can be further reduced.

[0035] Working principle: Figures 1-4 As shown, after the variable displacement compressor is started, gas (refrigerant) enters the compression chamber through the intake passage 10. After being compressed to a predetermined pressure in the compression chamber, it is discharged into the high-pressure chamber 2. The gas is discharged through the first exhaust port 4, so that the variable displacement compressor can absorb low-pressure refrigerant gas from the air-conditioning pipeline and then compress it into high-pressure gas. When the internal pressure of the variable displacement compressor reaches a certain threshold, the pressure relief valve starts to work. During the entire compression process, the pulse suppression mechanism expands the buffer space of the high-pressure gas through the combined action of the buffer chamber 9 and the high-pressure chamber 2, effectively suppressing pressure pulses and vibrations, improving the working efficiency of the variable displacement compressor, and extending the service life of the equipment. By reducing the exhaust pulse, the performance loss caused by the exhaust pulse can be reduced, thereby improving the efficiency of the variable displacement compressor. It can also reduce the temperature increase caused by the pulse formation, eliminate the pipeline resonance caused by the exhaust pulse, prevent fatigue damage of the pipeline and accessories due to excessive stress, improve reliability, and thus improve the smooth operation of the system, eliminate the fuselage resonance caused by the exhaust pulse, and improve the reliability of the variable displacement compressor and the service life of the supporting structure.

[0036] In the description of this utility model, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pulse suppression mechanism, characterized in that: It comprises a rear cover (1), a high-pressure chamber (2) is provided at the center of the inner side of the rear cover (1), and a first exhaust port (4) is provided on the bottom wall of the high-pressure chamber (2); A low-pressure chamber (3) is provided in the circumferential direction of the high-pressure chamber (2), surrounding the high-pressure chamber (2) and isolated from the high-pressure chamber (2), and the low-pressure chamber (3) is an air intake area; A first exhaust passage (5) extending radially from the first exhaust port (4) is provided on the inner wall of the rear cover (1); A second exhaust channel (6) is provided on the inner wall of the rear cover (1); the connection point between the second exhaust channel (6) and the first exhaust channel (5) is located on the side wall of the rear cover (1); and one end of the second exhaust channel (6) away from the first exhaust channel (5) passes through the rear cover (1) to form a second exhaust port (7).

2. The pulse suppression mechanism according to claim 1, characterized in that: A one-way exhaust valve is provided in the first exhaust port (4), and an exhaust end of the one-way exhaust valve is communicated with the first exhaust channel (5).

3. The pulse suppression mechanism according to claim 2, characterized in that: The end of the first exhaust channel (5) away from the first exhaust port (4) passes through the rear cover (1) and is in communication with the outside world. The end of the first exhaust channel (5) in communication with the outside world is a mounting port (8). The mounting port (8) is detachably connected to a pressure relief valve. The distance between the second exhaust channel (6) and the outer wall of the rear cover (1) is greater than the thickness of the outer wall of the rear cover (1).

4. The pulse suppression mechanism according to claim 1, characterized in that: A plurality of buffer chambers (9) communicating with the high-pressure chamber (2) are provided in the circumferential direction of the high-pressure chamber (2).

5. The pulse suppression mechanism according to claim 2, characterized in that: The centers of the high-pressure chamber (2) and the first exhaust port (4) coincide with each other.

6. The pulse suppression mechanism according to claim 2, characterized in that: The first exhaust port (4) is a conical structure.

7. A variable displacement compressor comprising a cylinder, characterized in that: It also comprises the pulse suppression mechanism according to any one of claims 1 to 6, wherein the cylinder is sealed by a rear cover (1).

8. The variable displacement compressor according to claim 7, characterized in that: An air intake passage (10) is provided on the outer peripheral wall of the cylinder body, and the air intake passage (10) is communicated with the low-pressure chamber (3).

9. The variable displacement compressor according to claim 8, characterized in that: The second exhaust channel (6) and the air intake channel (10) are staggered and arranged in the same direction.

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