Compression pump of air conditioning system

Abstract

The invention provides an air conditioning system compression pump which comprises a main shaft provided with a center channel extending in the axial direction of the main shaft, the center channel is a hole formed in the axial direction of the main shaft in a penetrating mode, one end of the center channel communicates with a low-pressure cavity of a rear cover, and the other end of the center channel extends to a front cover; the rear cover is provided with an air suction port and a low-pressure cavity, and the low-pressure cavity is communicated with the air suction port and is communicated with one end of the central channel of the main shaft; the front cover is provided with an oil hole and a low-pressure cavity; the piston is arranged in the pump body; the air suction valve plate is arranged between the front cover and the piston; when the piston moves leftwards, air is allowed to flow through the air suction port of the rear cover, the low-pressure cavity of the rear cover, the center channel of the main shaft, the oil hole of the front cover and the low-pressure cavity of the front cover in sequence. By means of the structure, an additional air suction path can be formed through the center channel of the main shaft, and the air suction capacity of the compression pump is improved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration and air conditioning technology, and in particular to a compressor pump for an air conditioning system. Background Technology

[0002] Currently, there are many types of air conditioning system compressor pumps on the market. Based on their structure and working principle, they can be divided into piston compressor pumps, scroll compressor pumps, screw compressor pumps, etc. Among them, piston compressor pumps are widely used in the automotive air conditioning field due to their relatively simple structure, low manufacturing cost, and strong adaptability. A piston compressor pump typically includes main components such as a cylinder block, piston, crankshaft connecting rod mechanism or swashplate mechanism, intake and exhaust valves, and front and rear end caps. During operation, the piston reciprocates within the cylinder, and through the cooperation of the intake and exhaust valves, the refrigerant is drawn in, compressed, and discharged.

[0003] As people's demands for automotive ride comfort continue to rise, and their emphasis on energy conservation and environmental protection grows, higher requirements are being placed on the performance of air conditioning system compressor pumps. These requirements include higher cooling efficiency, lower energy consumption, less vibration and noise, and greater reliability and durability. This is prompting engineers and researchers to continuously explore and improve compressor pump designs to meet the needs of the market and users.

[0004] In the existing piston-type air conditioning system compressor pumps, there are still some technical problems that need to be solved, among which the most prominent are insufficient air intake and insufficient shaft seal lubrication.

[0005] In existing technology, the intake of a compressor pump mainly relies on the intake port located on the rear cover. When the piston moves in the intake direction within the cylinder, the cylinder volume increases, the pressure decreases, creating a negative pressure, and low-pressure refrigerant vapor from the outside is drawn into the cylinder through the intake port. However, due to limitations in the internal structure of the compressor pump, such as the size and shape of the intake channel and obstructions from internal components, the actual flow area of ​​the intake channel is often smaller than the theoretical design value.

[0006] Specifically, the following factors may obstruct the inspiratory pathway, thereby affecting the inspiratory volume:

[0007] Limited intake port size: In order to ensure the overall size and strength of the compressor pump, the size of the intake port on the back cover is often limited, and the flow area is difficult to expand further, which becomes a bottleneck that limits the intake volume.

[0008] Internal structural components can obstruct the flow of refrigerant vapor, reducing the actual suction channel area and causing a loss of suction volume. This is especially noticeable in compact compressor pumps.

[0009] Insufficient valve opening response: The opening of the intake valve needs to overcome a certain spring force and inertial force. Under certain working conditions, the valve opening may be delayed or insufficient, resulting in the intake passage not being completely unobstructed.

[0010] Pressure loss during intake: As refrigerant vapor enters the cylinder through the intake port and intake passage, pressure loss occurs due to factors such as friction, which reduces the actual intake pressure inside the cylinder and thus affects the intake volume.

[0011] Insufficient air intake directly results in reduced volumetric efficiency of the compressor pump, decreasing the amount of refrigerant vapor drawn in per unit time. This leads to insufficient refrigerant flow in the refrigeration cycle, ultimately manifesting as insufficient cooling capacity in the air conditioning system. The system cannot quickly and effectively lower the temperature inside the vehicle or room, causing a very poor user experience, especially during hot summer months. Furthermore, to compensate for insufficient cooling capacity, some systems may increase the compressor pump's operating time or power, but this increases energy consumption, failing to meet energy conservation and environmental protection requirements. More seriously, insufficient air intake can also lead to a mismatch between the compressor pump and the air conditioning system, failing to meet the required cooling load and causing significant inconvenience and dissatisfaction for users. This is especially true for bidirectional reciprocating compressor pumps, whose structural characteristics make the air intake process more complex and prone to insufficient air intake problems.

[0012] In addition, insufficient shaft seal lubrication is a common problem in existing compression pumps.

[0013] Traditional compression pump shaft seal lubrication primarily relies on the high-speed rotation of the swashplate, which splashes lubricating oil from the pump's internal chambers onto the vicinity of the oil holes in the front cover. The oil then flows through these holes to the shaft seal under its own weight or the internal pressure of the pump, thus lubricating the seal. The effectiveness of this splashing is influenced by various factors, such as the pump's rotational speed, the amount of oil inside, and the viscosity of the lubricating oil. During low-speed operation or startup, the splashing effect is poor, making it difficult to ensure timely and effective lubrication of the shaft seal.

[0014] The amount of lubricating oil inside a compressor pump is limited, and some of it circulates with the refrigerant, making it difficult to ensure a constant supply of lubricating oil to the shaft seal. Especially after prolonged high-speed operation, some lubricating oil may be thrown to other parts, resulting in a reduction in the amount of oil near the shaft seal.

[0015] In summary, existing air conditioning system compressor pumps have significant deficiencies in terms of suction capacity and shaft seal lubrication. These deficiencies directly affect the cooling effect, energy consumption, and operational reliability of the air conditioning system, causing considerable inconvenience and economic losses to users. Therefore, it is urgent to propose a new technical solution to address the problems of insufficient suction capacity and inadequate shaft seal lubrication in existing compressor pumps, in order to improve the performance and reliability of air conditioning system compressor pumps and meet the growing market demand. Summary of the Invention

[0016] The purpose of this invention is to provide a compressor pump for an air conditioning system that can simultaneously improve ventilation and lubrication capabilities.

[0017] To achieve the above objectives, the present invention discloses a compressor pump for an air conditioning system, comprising: a main shaft having a central channel extending axially thereon, the central channel being a through hole axially extending through the main shaft, one end of which communicates with a low-pressure chamber of a rear cover, and the other end extending to a front cover; a rear cover having an air intake and a low-pressure chamber, the low-pressure chamber communicating with the air intake and with one end of the central channel of the main shaft; and a front cover having an oil hole and a low-pressure chamber, the oil hole communicating with the other end of the central channel of the main shaft, and the low-pressure chamber of the front cover communicating with the front cover. The pump body has an oil port; a piston, disposed within the pump body, reciprocates within the pump body; an intake valve is disposed between the front cover and the piston; the central channel of the main shaft, the low-pressure chamber of the rear cover, and the low-pressure chamber of the front cover are configured such that, when the piston moves to the left, air is allowed to flow sequentially through the intake port of the rear cover, the low-pressure chamber of the rear cover, the central channel of the main shaft, the oil port of the front cover, and the low-pressure chamber of the front cover, and finally enter the cylinder where the piston is located through the intake valve disposed between the front cover and the piston. By configuring the above structure, this invention can utilize the central channel of the main shaft to form an additional intake path, improving the intake capacity of the compression pump. Simultaneously, the central channel can also be configured to allow lubricating oil to pass through, serving as a path for lubricating oil, thereby simultaneously improving lubrication capacity.

[0018] Preferably, the main shaft of the front cover has at least one radially extending oil hole, the inner end of which communicates with the other end of the central channel of the main shaft. By providing the radially extending oil hole, an outlet is provided for lubricating oil to flow out from the central channel of the main shaft, facilitating lubrication of the shaft seal.

[0019] Preferably, the central channel of the spindle extends axially inside the spindle, and its end opening communicates with the inner end of the oil hole of the front cover. This structure, with its effective communication with the oil hole of the front cover, provides a more direct lubrication path for the lubricating oil.

[0020] Preferably, the oil hole of the front cover is inclined relative to the axis of the central channel of the spindle. The inclined oil hole may help guide airflow or lubricating oil to flow in a specific direction.

[0021] Preferably, the rear cover has an annular low-pressure chamber formed therein, and the peripheral wall of the low-pressure chamber is provided with an air intake port communicating with the outside of the compressor pump, and an axially extending channel port communicating with one end of the central channel of the main shaft. The design of the annular low-pressure chamber can effectively collect and buffer the intake refrigerant vapor, and the connection with the central channel of the main shaft through the axially extending channel port achieves the purpose of increasing the intake volume.

[0022] Preferably, the rear cover further includes an annular high-pressure chamber, which communicates with the exhaust port and is located within the rear cover among several low-pressure chambers. The annular high-pressure chamber is used to collect compressed high-pressure refrigerant vapor and guide it to the exhaust port.

[0023] Preferably, the intake port and the exhaust port are distributed along the axial direction of the rear cover, and the low-pressure chamber and the high-pressure chamber are distributed along the radial direction of the rear cover. This distribution makes the structure of the rear cover more compact, which is beneficial to the overall miniaturization of the compressor pump.

[0024] Preferably, the pump also includes a front valve plate assembly and a rear valve plate assembly. The front valve plate assembly includes the intake valve plate, and the rear valve plate assembly has a first surface that conforms to the end face of the rear cover and a second surface that conforms to the end face of the pump body. The rear valve plate assembly includes a rear intake valve plate and a rear exhaust valve plate, which are respectively connected to the low-pressure chamber and the high-pressure chamber of the rear cover. The intake and exhaust functions of the compressor pump are achieved through the front and rear valve plate assemblies and the intake and exhaust valve plates.

[0025] Preferably, the front valve plate assembly has a first surface that abuts against the end face of the front cover and a second surface that abuts against the end face of the pump body. The first surface of the front valve plate assembly communicates with the outer end of the oil hole in the front cover via the intake valve plate. This structure ensures that gas entering from the low-pressure chamber of the front cover can enter the cylinder through the intake valve plate.

[0026] In summary, this invention constructs an additional intake channel by setting a central channel on the main shaft, with one end connected to the low-pressure chamber of the rear cover and the other end connected to the low-pressure chamber of the front cover main shaft through an oil hole, thus creating an additional intake channel. When the piston moves in the intake direction, in addition to the traditional intake port, refrigerant vapor can also enter the cylinder through the central channel of the main shaft, effectively increasing the intake volume of the compression pump and solving the problem of insufficient cooling capacity caused by insufficient intake volume in the prior art. Simultaneously, the central channel of the main shaft can also serve as a lubricating oil channel, allowing lubricating oil to flow out through the oil hole of the front cover main shaft, lubricating the shaft seal. Compared to the traditional oil-throwing lubrication method, this invention provides more direct and reliable lubrication, effectively alleviating the problem of insufficient shaft seal lubrication. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the compressor pump structure of an air conditioning system according to one embodiment of the present invention. Detailed Implementation

[0028] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the compressor pump structure of an air conditioning system according to one embodiment of the present invention, and it is a cross-sectional structural diagram. Figure 1 As shown, the present invention discloses an air conditioning system compressor pump, which mainly includes components such as a main shaft (1), a rear cover (7), a front cover (6), a piston (3), an intake valve plate (8), and a pump body (4).

[0030] The main shaft (1) is the core rotating component of the compression pump, and it has a central channel (11) extending along its axial direction. The central channel (11) is a through hole extending along the axial direction of the main shaft (1), for example, it can be a cylindrical through hole. One end of the central channel (11) communicates with the low-pressure chamber (71) of the rear cover (7), and the other end extends to the front cover (6). Specifically, as Figure 1 As shown, one end of the main shaft (1) can extend through the rear valve plate assembly (10) into the interior of the rear cover (7) and communicate with the low-pressure chamber (71) inside the rear cover (7); the other end of the main shaft (1) extends into the interior of the front cover (6). This through-type central channel (11) design provides a reliable physical passage for the flow of gas and lubricating oil.

[0031] The rear cover (7) is located at the rear end of the compressor pump and has an intake port (73) and a low-pressure chamber (71). The low-pressure chamber (71) is a cavity with a certain volume formed inside the rear cover (7) for buffering and distributing the intake refrigerant vapor. The low-pressure chamber (71) is connected to the intake port (73), and external low-pressure refrigerant vapor enters the low-pressure chamber (71) through the intake port (73). Furthermore, the low-pressure chamber (71) is connected to one end of the central channel (11) of the main shaft (1), so that the refrigerant vapor entering the low-pressure chamber (71) can further enter the central channel (11) of the main shaft (1).

[0032] The front cover (6) is located at the front end of the compression pump and has an oil hole (61) and a low-pressure chamber (62). The oil hole (61) is a channel provided on the front cover (6) and is connected to the other end of the central channel (11) of the main shaft (1), so that gas or lubricating oil flowing out from the central channel (11) of the main shaft (1) can enter the oil hole (61) of the front cover (6). The low-pressure chamber (62) of the front cover (6) is connected to the oil hole (61) of the front cover (6), and the gas entering from the oil hole (61) can further enter the low-pressure chamber (62) of the front cover (6).

[0033] The piston (3) is disposed inside the pump body (4) and is used to reciprocate within the pump body (4) to compress the refrigerant. The reciprocating motion of the piston (3) is driven by mechanisms such as the swashplate (2) and the sliding shoe (5).

[0034] The suction valve (8) is located between the front cover (6) and the piston (3) and is used to control the unidirectional flow of refrigerant vapor into the cylinder. When the piston (3) moves in the suction direction, the suction valve (8) opens to allow refrigerant vapor to enter; when the piston (3) moves in the exhaust direction, the suction valve (8) closes to prevent refrigerant vapor from flowing back.

[0035] The core of this invention lies in the fact that the central channel (11) of the main shaft (1), the low-pressure chamber (71) of the rear cover (7), and the low-pressure chamber (62) of the front cover (6) are configured such that when the piston (3) moves to the left, air is allowed to flow sequentially through the air intake (73) of the rear cover (7), the low-pressure chamber (71) of the rear cover (7), the central channel (11) of the main shaft (1), the oil hole (61) of the front cover (6), and the low-pressure chamber (62) of the front cover (6), and finally enter the cylinder where the piston (3) is located through the air intake valve plate (8) disposed between the front cover (6) and the piston (3). This design cleverly utilizes the central channel (11) of the main shaft (1) as an additional air intake channel, which can effectively increase the air intake of the compressor pump and improve the refrigeration efficiency.

[0036] Furthermore, such as Figure 1 As shown, the main shaft of the front cover (6) has at least one (two in this embodiment) radially extending oil hole (61). The oil hole (61) extends from the outside to the inside of the main shaft (1), and the inner end of the oil hole (61) communicates with the other end of the central channel (11) of the main shaft (1). For example, the oil hole (61) can be a circular hole, the diameter of which can be designed according to actual lubrication requirements. This radially extending oil hole (61) provides a convenient outlet for lubricating oil to flow out from the central channel (11) of the main shaft (1), so that the lubricating oil can reach components that require lubrication, such as the shaft seal (13). The oil hole 61 can be understood as a channel hole for air passage and lubrication.

[0037] Furthermore, such as Figure 1 As shown, the central channel (11) of the main shaft (1) extends axially inside the main shaft (1), and its end opening communicates with the inner end of the oil hole (61) of the front cover (6). This axially extending central channel (11) has a simple and reliable structure, is easy to process and manufacture, and can ensure the smooth flow of lubricating oil and gas.

[0038] Furthermore, such as Figure 1 As shown, the oil hole (61) of the front cover (6) is inclined relative to the axis of the central channel (11) of the main shaft (1). For example, the oil hole (61) and the axis of the central channel (11) can form an angle of 15-45 degrees. This inclined setting can better guide the lubricating oil flowing out of the central channel (11) of the main shaft (1) towards the shaft seal (13), improving lubrication efficiency; at the same time, the inclined angle also facilitates the smooth entry of gas into the low-pressure chamber (62) of the front cover (6).

[0039] Furthermore, such as Figure 1 As shown, the rear cover (7) has, in addition to the low-pressure chamber (71) connected to the central channel (11), several low-pressure chambers (72) arranged in a ring inside it. The low-pressure chambers (72) are distributed in a ring around the axis of the main shaft (1), which increases the volume of the low-pressure chambers (72) and is beneficial for the buffering and distribution of refrigerant vapor. The peripheral wall of the low-pressure chamber (72) is provided with the suction port (73) connected to the outside of the compressor pump, and an axially extending channel opening connected to one end of the central channel (11) of the main shaft (1). For example, the channel opening can be a circular hole with its axis parallel to the axis of the main shaft (1). This design allows refrigerant vapor to smoothly enter the low-pressure chambers (71, 72) from the suction port (73) and enter the central channel (11) of the main shaft (1) through the channel opening, providing a structural basis for increasing the suction volume.

[0040] Furthermore, such as Figure 1 As shown, the rear cover (7) also includes an annular high-pressure chamber (74), which communicates with the exhaust port (75). The high-pressure chamber (74) is located within the rear cover (7) between several low-pressure chambers (71, 72). For example, for a bidirectional piston compressor pump, the rear cover (7) may have two low-pressure chambers (71, 72) and a high-pressure chamber (74) located in the middle. The annular high-pressure chamber (74) can effectively collect the high-pressure refrigerant vapor discharged from the cylinder and guide it to the exhaust port to discharge the refrigerant.

[0041] In a bidirectional reciprocating compressor pump, the piston typically reciprocates within the pump body, with the two piston faces alternately performing intake and compression operations. When one piston moves in a certain direction, the cylinder volume on that side increases, creating a low pressure to draw in refrigerant; conversely, the piston on the other side moves in the opposite direction, decreasing the cylinder volume to compress the refrigerant. Therefore, to accommodate this bidirectional operating mode, low-pressure chambers are required at both ends of the piston's movement to collect the refrigerant vapor to be compressed.

[0042] The high-pressure refrigerant gas, after being compressed by the piston, needs to be collected and directed to the exhaust port. Placing the high-pressure chamber between the two low-pressure chambers allows for more efficient reception of the high-pressure gas discharged from both cylinders. If the high-pressure chamber is located outside one of the low-pressure chambers, the high-pressure gas discharged from the other cylinder will have to travel a longer path to reach the high-pressure chamber, which increases flow resistance and reduces efficiency.

[0043] Furthermore, the intake port (73) and the exhaust port are distributed along the axial direction of the rear cover (7), and the low-pressure chambers (71, 72) and the high-pressure chamber (74) are distributed along the radial direction of the rear cover (7). This axial and radial distribution makes the structure of the rear cover (7) more compact, with higher space utilization, which is beneficial to the overall miniaturization of the compressor pump.

[0044] Furthermore, such as Figure 1As shown, the air conditioning system compressor pump of the present invention further includes a front valve plate assembly (14) and a rear valve plate assembly (10). The front valve plate assembly (14) includes the suction valve plate (8). The rear valve plate assembly (10) has a first surface that fits against the end face of the rear cover (7) and a second surface that fits against the end face of the pump body (4). The rear valve plate assembly (10) includes a rear suction valve plate (81) and a rear exhaust valve plate (9), which are respectively connected to the low-pressure chamber (71) and the high-pressure chamber (74) of the rear cover (7). Through the precise cooperation of the front and rear valve plate assemblies (14, 10) and the suction valve plate (8) and the rear exhaust valve plate (9), the intake and exhaust of refrigerant vapor can be effectively controlled, ensuring the normal operation of the compressor pump.

[0045] Furthermore, such as Figure 1 As shown, the front valve plate assembly (14) has a first surface that fits against the end face of the front cover (6) and a second surface that fits against the end face of the pump body (4). The first surface of the front valve plate assembly (14) is connected to the outer end of the oil hole (61) of the front cover (6) through the intake valve plate (8). This structural design ensures that the gas entering from the low-pressure chamber (62) of the front cover (6) can smoothly enter the cylinder where the piston (3) is located through the intake valve plate (8) and participate in the compression process.

[0046] The front valve plate assembly (14) is connected to the outer end of the oil hole (61) of the front cover (6) through the intake valve plate (8). This structure is the key to effectively controlling the refrigerant entering the cylinder.

[0047] The intake valve (8) acts as a one-way valve, allowing refrigerant vapor to flow into the cylinder in one direction and preventing it from flowing in the opposite direction. To achieve this function, the intake valve (8) must be located on the only passage from the low-pressure chamber (62) of the front cover (6) to the cylinder. In this invention, the central channel (11) of the spindle (1) serves as an additional intake passage, connecting the low-pressure chamber (71) of the rear cover (7) to the oil hole (61) of the front cover (6). Therefore, the oil hole (61) in this invention is not only an outlet for lubricating oil but also a passage for intake gas.

[0048] If the front valve plate assembly (14) is connected to the inner end of the oil hole (61) (the end closest to the central channel of the main shaft), then the gas entering the oil hole (61) from the central channel (11) of the main shaft (1) will directly enter the rear side of the front valve plate assembly (14) and cannot be controlled by the intake valve plate (8). This means that regardless of whether the piston (3) is in the intake stroke, the gas can freely flow into the cylinder from the central channel (11) of the main shaft (1), and the compression pump will not be able to effectively control the amount of gas drawn into the cylinder, affecting the compression efficiency and cooling effect.

[0049] During the compression stroke of the piston (3), high-pressure gas may flow back to the central channel (11) of the main shaft (1) through the oil hole (61), reducing the compression efficiency.

[0050] By connecting to the outer end of the oil hole (61), the front valve plate assembly (14) ensures that all gas entering the oil hole (61) through the central channel (11) of the spindle (1) must first enter the low-pressure chamber (62) of the front cover (6), and then enter the cylinder where the piston (3) is located under the control of the suction valve plate (8). In this way, the suction valve plate (8) can effectively control all refrigerant entering the cylinder, whether it comes from the conventional suction port or the supplementary airflow from the central channel of the spindle.

[0051] As can be seen from the above description of the specific embodiments, the present invention cleverly constructs an additional suction channel by setting a central channel (11) inside the main shaft (1) and connecting it with the low-pressure chamber (71) of the rear cover (7) and the low-pressure chamber (62) of the front cover (6). When the piston (3) moves in the suction direction, in addition to suction through the conventional suction port (73), refrigerant vapor can also enter the cylinder through the central channel (11) of the main shaft (1), thereby effectively increasing the suction volume of the compressor pump, solving the technical problem of insufficient suction volume leading to insufficient cooling capacity in the prior art, and improving the cooling effect of the air conditioning system. At the same time, the central channel (11) of the main shaft (1) can also serve as a lubricating oil channel. Lubricating oil can flow out through the oil hole (61) of the main shaft of the front cover (6) to lubricate components such as the shaft seal (13). Compared with the traditional method of lubrication by relying on oil slinging, the present invention can provide more direct and reliable lubrication, effectively alleviating the problem of insufficient shaft seal lubrication, and improving the operating reliability and service life of the compressor pump.

Claims

1. A compressor pump for an air conditioning system, characterized in that, include: The main shaft has a central channel extending along its axial direction, the central channel being a through hole provided along the axial direction of the main shaft, one end of which communicates with the low-pressure chamber of the rear cover, and the other end of which extends to the front cover; The rear cover has an air intake and a low-pressure chamber, the low-pressure chamber being connected to the air intake and to one end of the central channel of the main shaft; The front cover has an oil hole and a low-pressure chamber, the oil hole being connected to the other end of the central channel of the spindle, and the low-pressure chamber of the front cover being connected to the oil hole of the front cover. A piston is disposed within the pump body and is used for reciprocating motion within the pump body; An intake valve is disposed between the front cover and the piston; The central channel of the spindle, the low-pressure chamber of the rear cover, and the low-pressure chamber of the front cover are configured such that when the piston moves to the left, air is allowed to flow sequentially through the air intake of the rear cover, the low-pressure chamber of the rear cover, the central channel of the spindle, the oil hole of the front cover, and the low-pressure chamber of the front cover, and finally enter the cylinder where the piston is located through the air intake valve plate disposed between the front cover and the piston.

2. The air conditioning system compressor pump according to claim 1, characterized in that, The main shaft of the front cover has at least one radially extending oil hole, the inner end of which communicates with the other end of the central channel of the main shaft.

3. The air conditioning system compressor pump according to claim 2, characterized in that, The central channel of the spindle extends axially inside the spindle, and its end opening communicates with the inner end of the oil hole of the front cover.

4. The air conditioning system compressor pump according to claim 2 or 3, characterized in that, The oil hole of the front cover is inclined relative to the axis of the central channel of the main shaft.

5. The air conditioning system compressor pump according to claim 4, characterized in that, The rear cover has an annular low-pressure chamber formed therein, and the peripheral wall of the low-pressure chamber is provided with an air intake port communicating with the outside of the compression pump, and an axially extending channel opening communicating with one end of the central channel of the main shaft.

6. The air conditioning system compressor pump according to claim 5, characterized in that, The rear cover also includes an annular high-pressure chamber, which is connected to the exhaust port and is located within the rear cover between several low-pressure chambers.

7. The air conditioning system compressor pump according to claim 6, characterized in that, The air intake and the air exhaust are distributed along the axial direction of the rear cover, and the low-pressure chamber and the high-pressure chamber are distributed along the radial direction of the rear cover.

8. The air conditioning system compressor pump according to claim 7, characterized in that, It also includes a front valve plate assembly and a rear valve plate assembly, the front valve plate assembly including the intake valve plate. The rear valve plate assembly has a first surface that fits against the end face of the rear cover and a second surface that fits against the end face of the pump body. The rear valve plate assembly includes a rear intake valve plate and a rear exhaust valve plate, which are respectively connected to the low-pressure chamber of the rear cover and the high-pressure chamber of the rear cover.

9. The air conditioning system compressor pump according to claim 8, characterized in that, The front valve plate assembly has a first surface that fits against the end face of the front cover and a second surface that fits against the end face of the pump body. The first surface of the front valve plate assembly is connected to the outer end of the oil hole of the front cover through the suction valve plate.

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