A valve trim assembly system and method

Abstract

The present application relates to the technical field of hydraulic pump, in particular to a valve core assembly assembling system and method.A valve core assembly assembling system includes a valve core assembly, an oil injection unit and an air injection pipe.The valve core assembly includes a valve shaft unit and a sealing unit.The valve shaft unit includes a first shaft and a second shaft.The sealing unit is sleeved on the second shaft.A plurality of oil injection units are distributed along the outer circumferential side of the sealing unit in a circumferential direction.The oil injection unit is spaced apart from the sealing unit.The injection direction of the oil injection unit is along the radial direction of the sealing unit and faces the sealing unit.The air injection pipe is sleeved on the outer circumferential side of the second shaft away from the first shaft.The sealing unit is located between the first shaft and the air injection pipe.The injection direction of the air injection pipe is along the axial direction of the sealing unit and faces the sealing unit.This solves the problem that the sealing unit is easy to fall off from the second shaft during oil injection.

Description

Technical Field

[0001] This invention relates to the field of hydraulic pump technology, and more specifically, to a valve core assembly system and method. Background Technology

[0002] Hydraulic pumps are the core power components of hydraulic systems. They convert mechanical energy input from motors, engines, etc., into hydraulic energy through the periodic changes in the volume of a sealed working chamber. They draw in low-pressure hydraulic oil and discharge high-pressure hydraulic oil, providing power to actuators such as hydraulic cylinders and motors. They are key equipment for realizing fluid transmission and control. They are widely used in many fields such as engineering machinery, industrial machine tools, transportation, aerospace, and agriculture and mining, supporting the stable operation of various heavy-duty, high-precision equipment. Piston pumps are a type of hydraulic pump, belonging to the high-pressure positive displacement hydraulic pump category. A piston pump mainly consists of a drive shaft, pump housing, valve core, swashplate or cam, distributor plate, and seals. One end of the drive shaft connects to external power, and the other end is fixedly connected to the pump housing. The pump housing has multiple precision holes evenly distributed circumferentially, each containing a reciprocating valve core. One end of the valve core is attached to the swashplate via a slipper. The distributor plate is fixed to the pump housing and has suction and discharge grooves on its surface, fitting snugly against the pump housing end face. Seals are used to reduce oil leakage.

[0003] Before installing the valve core of the plunger pump inside the pump housing, the sealing ring needs to be lubricated to prevent damage during installation. When oil is sprayed onto the sealing ring through the nozzle, the clearance between the inner diameter of the sealing ring and the piston rod can cause the sealing ring to easily detach from the piston rod during oil spraying and come into contact with the oil injection unit, reducing the oil spraying effect and preventing further installation. Summary of the Invention

[0004] To address the problem that the sealing unit easily detaches from the second shaft during the oil injection process, this invention provides a valve core assembly system and method.

[0005] In a first aspect, the present invention provides a valve core assembly system, comprising:

[0006] A valve core assembly includes a valve shaft unit and a sealing unit; the valve shaft unit includes a first shaft and a second shaft; the second shaft is connected to the first shaft; the outer diameter of the first shaft is larger than the outer diameter of the second shaft; the sealing unit is sleeved on the second shaft; the inner diameter of the sealing unit is smaller than the outer diameter of the first shaft and larger than the outer diameter of the second shaft.

[0007] A plurality of oil injection units are distributed circumferentially along the outer periphery of the sealing unit; the oil injection units are spaced apart from the sealing unit; the spray direction of the oil injection units is radially toward the sealing unit.

[0008] A jet pipe is sleeved on the outer periphery of the end of the second shaft away from the first shaft; the sealing unit is located between the first shaft and the jet pipe, and the jet pipe's ejection direction is axially toward the sealing unit.

[0009] In some embodiments, the valve core assembly system includes an air jet unit; the air jet unit includes a flared tube and an air jet pipe; the flared tube is sleeved on the second shaft; the flared tube is coaxially connected to the ejection end of the air jet pipe; the inner diameter of the flared tube gradually increases along the ejection direction of the air jet pipe; the maximum inner diameter of the flared tube is smaller than the outer diameter of the sealing unit and larger than the inner diameter of the sealing unit.

[0010] In some embodiments, the valve core assembly system includes a support ring; the support ring is simultaneously sleeved on the outer periphery of the first shaft, the second shaft, and the jet pipe; the oil injection unit includes an oil supply section and a nozzle; the nozzle communicates with the oil supply section; the nozzle is connected to the support ring; the nozzle's spray direction is radially toward the sealing unit.

[0011] In some embodiments, the valve core assembly system includes an injection assembly; the injection assembly includes a support unit and the injection unit; the support unit includes a baffle, a clearance hole, and a support ring; the clearance hole passes through the baffle; the baffle is sleeved on the outer periphery of the first shaft through the clearance hole, and the baffle is connected to one end of the support ring.

[0012] In some embodiments, the valve core assembly system includes an anti-disengagement component; the anti-disengagement component includes a return air unit and the jet unit; the return air unit includes a return air pipe and a blocking ring;

[0013] The return air pipe and the blocking ring are coaxially connected; the inner diameter of the blocking ring is greater than or equal to the inner diameter of the return air pipe; the return air pipe is sleeved on the outer periphery of the jet pipe; the inner diameter of the return air pipe is greater than the outer diameter of the jet pipe and the outer diameter of the flared pipe, respectively; the gap between the inner peripheral wall of the return air pipe and the outer peripheral wall of the jet pipe forms a first return air channel; the blocking ring is located at the end of the return air pipe facing the sealing unit; the inner diameter of the blocking ring is smaller than the outer diameter of the sealing unit.

[0014] In some embodiments, the projection of one end of the blocking ring toward the sealing unit along the second axial direction at least partially coincides with the oil injection unit.

[0015] In some embodiments, the outer diameter of the blocking ring gradually increases along the ejection direction of the jet pipe; the minimum outer diameter of the blocking ring is the same as the outer diameter of the return air pipe.

[0016] In some embodiments, the distance from the flared tube along the second axis to the sealing unit is greater than the distance from the blocking ring along the second axis to the sealing unit.

[0017] In a second aspect, the present invention provides a valve core assembly method, wherein the valve core assembly method is applied to any of the valve core assembly systems described in the first aspect; the valve core assembly method includes:

[0018] The sealing unit is fitted onto the second shaft;

[0019] Move the valve core assembly so that the sealing unit is located between the plurality of the oil injection units, and fit the jet pipe onto the outer peripheral side of the second shaft;

[0020] The sealing unit is purged with air through the jet pipe and lubricated with oil through the oil spraying unit.

[0021] The valve core assembly is installed onto the plunger pump.

[0022] In some embodiments, the valve core assembly system includes a support unit and an anti-disengagement component; the support unit includes a baffle, a clearance hole, and a support ring; the anti-disengagement component includes an air jet unit and a return air unit; the air jet unit includes a flared pipe and the air jet pipe; the return air unit includes a return air pipe and a blocking ring; the gap between the return air pipe and the air jet pipe forms a first return air channel; the gap between the return air pipe and the support ring forms a second return air channel; and the gap between the clearance hole and the first shaft forms a third return air channel.

[0023] To address the problem of the sealing unit easily detaching from the second shaft during the oil injection process, this invention has the following advantages:

[0024] By circumferentially distributing oil spray units along the outer periphery of the sealing unit, with the spray direction of the oil spray units radially towards the sealing unit, and by fitting the jet pipe onto the outer periphery of the end of the second shaft furthest from the first shaft, gas can be sprayed from the jet pipe toward the sealing unit, thereby pushing the sealing unit along the axis of the second shaft toward the first shaft. Once the sealing unit reaches a position corresponding to the spray direction of the oil spray units, oil is sprayed onto the sealing unit by the oil spray units, thus completing the oil spraying process and achieving a good oil spraying effect. During oil spraying, the airflow from the jet pipe blows the sealing unit, keeping it fitted onto the second shaft and within the effective oil spraying range of the oil spray units. Furthermore, the oil spray units, in conjunction with the first shaft, restrict the position of the sealing unit, preventing it from detaching from the second shaft during oil spraying. During and after oil spraying, the jet pipe does not contact the sealing unit, thus ensuring the oil spraying effect on the outer surface of the sealing unit. Attached Figure Description

[0025] Figure 1 A cross-sectional schematic diagram of a valve core assembly system according to one embodiment is shown;

[0026] Figure 2 It shows the application to Figure 1 A flowchart of a valve core assembly system according to one embodiment.

[0027] Reference numerals: 10 Valve core assembly; 11 Valve shaft unit; 111 First shaft; 112 Second shaft; 12 Sealing unit; 121 Sealing ring; 122 Retaining ring; 20 Injection assembly; 21 Support unit; 211 Support ring; 212 Baffle; 213 Clearance hole; 22 Injection unit; 221 Injection supply section; 222 Nozzle; 30 Anti-detachment assembly; 31 Injection unit; 311 Injection pipe; 312 Flaring pipe; 32 Return air unit; 321 Return air pipe; 322 Retaining ring; 33 Air supply section. Detailed Implementation

[0028] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0029] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0030] Hydraulic pumps are the core power components of hydraulic systems. Piston pumps are a type of hydraulic pump, mainly composed of a drive shaft, pump housing, valve core, swashplate or cam, distributor plate, and seals. One end of the drive shaft connects to an external power source, and the other end connects to the pump housing. The pump housing has multiple precision holes evenly distributed around its circumference, in which a reciprocating valve core is installed. One end of the valve core is pressed against the swashplate via a slipper. The distributor plate is fixed to the pump housing, with suction and discharge grooves on its surface that fit against the pump housing end face. Seals are used to reduce oil leakage. Before assembling the valve core with the pump housing, the sealing ring 121 needs to be lubricated to prevent installation damage. When oil is sprayed onto the sealing ring 121 through the injector, because the inner diameter of the sealing ring 121 is in clearance fit with the piston rod, the sealing ring 121 can easily detach from the piston rod and contact the injection unit 22, reducing the injection effect and affecting subsequent installation.

[0031] To address the problem that the sealing unit easily detaches from the second shaft during the oil injection process, this invention provides a valve core assembly system and method.

[0032] Example 1:

[0033] This embodiment provides a valve core assembly system. In this embodiment, such as... Figure 1 As shown, a valve core assembly system includes a valve core assembly 10, an oil injection unit 22, and an air jet pipe 311.

[0034] The valve core assembly 10 includes a valve shaft unit 11 and a sealing unit 12. The valve shaft unit 11 includes a first shaft 111 and a second shaft 112. The second shaft 112 is connected to the first shaft 111. The outer diameter of the first shaft 111 is larger than the outer diameter of the second shaft 112. The sealing unit 12 is sleeved on the second shaft 112. The inner diameter of the sealing unit 12 is smaller than the outer diameter of the first shaft 111 and larger than the outer diameter of the second shaft 112. This allows the sealing unit 12 to move along the axis of the second shaft 112 and be pushed by the gas ejected from the jet pipe 311, and then move a certain distance toward the first shaft 111 before being blocked and stopped by the first shaft 111.

[0035] The oil spraying unit 22 has multiple oil spraying units 22 distributed circumferentially along the outer periphery of the sealing unit 12; the oil spraying unit 22 is spaced apart from the sealing unit 12; the spraying direction of the oil spraying unit 22 is radially toward the sealing unit 12; by circumferentially arranging multiple oil spraying units 22 on the outer periphery of the sealing unit 12, oil can be evenly sprayed onto the outer periphery of the sealing unit 12.

[0036] A jet pipe 311 is sleeved on the outer periphery of the end of the second shaft 112 away from the first shaft 111. A sealing unit 12 is located between the first shaft 111 and the jet pipe 311, with the jet pipe 311 spraying towards the sealing unit 12 along its axial direction. By spraying sufficiently pressurized gas through the jet pipe 311 towards the sealing unit 12, the sealing unit 12 is pushed towards the first shaft 111 along its axis. Once the sealing unit 12 reaches a position corresponding to the spray direction of the oil injection unit 22, it is prevented from moving away from the first shaft 111. This jet spraying prevents the sealing unit 12 from detaching from the second shaft 112 during oil spraying, and ensures that the jet pipe 311 does not contact the sealing unit 12 during or after the oil spraying process, thus guaranteeing the effective oil spraying on the outer surface of the sealing unit 12.

[0037] Furthermore, such as Figure 1As shown, the valve core assembly system includes an air jet unit 31; the air jet unit 31 includes a flared pipe 312 and an air jet pipe 311; the flared pipe 312 is sleeved on the second shaft 112; the flared pipe 312 is coaxially connected to the ejection end of the air jet pipe 311; the inner diameter of the flared pipe 312 gradually increases along the ejection direction of the air jet pipe 311.

[0038] This allows the flared tube 312 to expand the range of gas ejection, increasing the area of ​​the sealing unit 12 that is propelled by the gas, thereby improving the effect of blowing the sealing unit 12. The maximum inner diameter of the flared tube 312 is smaller than the outer diameter of the sealing unit 12 but larger than the inner diameter of the sealing unit 12. This ensures that the sealing unit 12 will come into contact with the flared tube 312 after moving a certain distance toward the jet pipe 311, thus preventing the sealing unit 12 from being fitted onto the outer periphery of the jet pipe 311.

[0039] Furthermore, such as Figure 1 As shown, the valve core assembly system includes a support ring 211; the support ring 211 is simultaneously sleeved on the outer periphery of the first shaft 111, the second shaft 112, and the jet pipe 311; the oil injection unit 22 includes an oil supply part 221 and a nozzle 222; the nozzle 222 is connected to the oil supply part 221; the nozzle 222 is connected to the support ring 211; the spray direction of the nozzle 222 is radially toward the sealing unit 12.

[0040] This allows the nozzle 222 to be mounted on the support ring 211, and oil to be supplied to the nozzle 222 through the oil supply section 221, enabling the nozzle 222 to spray oil radially toward the sealing unit 12. Furthermore, the support ring 211 can block any oil that does not reach the sealing unit 12, preventing it from splashing onto other parts.

[0041] Furthermore, such as Figure 1 As shown, the valve core assembly system includes an oil injection assembly 20; the oil injection assembly 20 includes a support unit 21 and an oil injection unit 22; the support unit 21 includes a baffle 212, a clearance hole 213, and a support ring 211; the clearance hole 213 penetrates the baffle 212; the baffle 212 is fitted onto the outer periphery of the first shaft 111 through the clearance hole 213, and one end of the baffle 212 is connected to the support ring 211. This allows the valve core assembly 10 and the oil injection assembly 20 to be assembled through the clearance hole 213. Connecting the baffle 212 to the support ring 211 blocks oil that has not adhered to the sealing unit 12 and oil that has rebounded, reducing the oil splash range. Furthermore, there is a gap between the clearance hole 213 and the outer diameter of the first shaft 111, allowing gas that has passed through the sealing unit 12 to flow out through the clearance hole 213.

[0042] Furthermore, such as Figure 1As shown, the valve core assembly system includes an anti-disengagement component 30; the anti-disengagement component 30 includes a return air unit 32 and an injection unit 31; the return air unit 32 includes a return air pipe 321 and a blocking ring 322;

[0043] The return air pipe 321 and the blocking ring 322 are coaxially connected; the inner diameter of the blocking ring 322 is greater than or equal to the inner diameter of the return air pipe 321; the return air pipe 321 is sleeved on the outer periphery of the jet pipe 311; the inner diameter of the return air pipe 321 is greater than the outer diameter of the jet pipe 311 and the outer diameter of the flared pipe 312, respectively; the gap between the inner peripheral wall of the return air pipe 321 and the outer peripheral wall of the jet pipe 311 forms the first return air channel; since a portion of the gas sprayed from the jet pipe 311 to the sealing unit 12 will be blocked by the sealing unit 12 and bounce back, this arrangement can provide a predetermined return air channel for this portion of gas.

[0044] The blocking ring 322 is located at the end of the return air pipe 321 facing the sealing unit 12. The inner diameter of the blocking ring 322 is smaller than the outer diameter of the sealing unit 12, so that when the sealing unit 12 moves toward the jet pipe 311, it can be blocked by the blocking ring 322, preventing the sealing unit 12 from entering the interior of the return air pipe 321 and then fitting around the outer periphery of the jet pipe 311.

[0045] Preferably, the connection between the blocking ring 322 and the return air pipe 321 can be integrally formed, which makes the connection more secure and easier to process.

[0046] Furthermore, such as Figure 1 As shown, the projection of the end of the blocking ring 322 facing the sealing unit 12 along the axis of the second shaft 112 at least partially coincides with the oil injection unit 22.

[0047] When the anti-detachment component 30 is installed inside the fuel injection assembly 20, the blocking ring 322 needs to move towards the first shaft 111 along the axial direction of the second shaft 112. This prevents the blocking ring 322 from entering between the multiple ring-shaped fuel injection units 22 and prevents the blocking ring 322 from interfering with the fuel injection process.

[0048] Furthermore, such as Figure 1 As shown, the outer diameter of the deflector ring 322 gradually increases along the ejection direction of the jet pipe 311; the minimum outer diameter of the deflector ring 322 is the same as the outer diameter of the return air pipe 321. This satisfies the requirement that the projection of the end of the deflector ring 322 facing the sealing unit 12 along the axis of the second axis 112 at least partially coincides with the fuel injection unit 22. At the same time, this arrangement can reduce the outer diameter of the deflector ring 322 facing the jet pipe 311, saving material for the deflector ring 322 and reducing costs.

[0049] Furthermore, such as Figure 1As shown, the distance from the flared pipe 312 to the sealing unit 12 along the axis of the second shaft 112 is greater than the distance from the blocking ring 322 to the sealing unit 12 along the axis of the second shaft 112. This ensures that when the sealing unit 12 moves towards the flared pipe 312 along the second shaft 112, it can be blocked by the blocking ring 322, thereby preventing the sealing unit 12 from contacting the flared pipe 312 and ensuring the oil injection effect.

[0050] In other embodiments, the sealing unit 12 includes a sealing ring 121 and a retaining ring 122, both of which are elastic bodies that can undergo elastic deformation when compressed. The retaining ring 122 fits tightly with the hole on the cylinder body and seals the oil in the cylinder body through the sealing ring 121.

[0051] In other embodiments, the anti-detachment component 30 also includes an air supply section 33, which is connected to a jet pipe 311, so that the gas stored in the air supply section 33 can be ejected through the jet pipe 311 to blow the sealing unit 12.

[0052] Example 2:

[0053] This embodiment provides a valve core assembly method. In this embodiment, the valve core assembly method is applied to any of the valve core assembly systems in Embodiment 1. Figure 2 As shown, the valve core assembly assembly method includes steps S10-S40, which are explained in detail below:

[0054] Step S10: Fit the sealing unit 12 onto the second shaft 112;

[0055] Step S20: Move the valve core assembly 10 to a position where the sealing unit 12 is located between multiple injection units 22, and fit the jet pipe 311 onto the outer periphery of the second shaft 112;

[0056] Step S30: Air is blown onto the sealing unit 12 through the jet pipe 311, and lubricating oil is sprayed onto the sealing unit 12 through the oil spraying unit 22. When the oil spraying unit 22 sprays oil, the jet pipe 311 sprays air to blow the sealing unit 12, so that the sealing unit 12 is kept sleeved on the second shaft 112 and within the effective oil spraying range of the oil spraying unit 22. Moreover, the oil spraying unit 22, together with the first shaft 111, restricts the position of the sealing unit 12, which can prevent the sealing unit 12 from falling off the second shaft 112 during oil spraying. In addition, during this process and after the oil spraying is completed, the jet pipe 311 does not contact the sealing unit 12, thereby ensuring the oil spraying effect on the outer surface of the sealing unit 12.

[0057] Step S40: Install the valve core assembly 10 to the plunger pump. Install the retaining ring 122 of the sealing unit 12 onto the precision hole of the inner pump housing of the plunger pump, and seal it using the sealing ring 121.

[0058] Furthermore, the valve core assembly system includes a support unit 21 and an anti-disengagement component 30; the support unit 21 includes a baffle 212, a clearance hole 213, and a support ring 211; the anti-disengagement component 30 includes an injection unit 31 and a return air unit 32; the injection unit 31 includes a flared pipe 312 and an injection pipe 311; the return air unit 32 includes a return air pipe 321 and a blocking ring 322; the gap between the return air pipe 321 and the injection pipe 311 forms a first return air channel; the gap between the return air pipe 321 and the support ring 211 forms a second return air channel; the gap between the clearance hole 213 and the first shaft 111 forms a third return air channel;

[0059] Step S30 includes steps S31-S32, as detailed below:

[0060] Step S31: Air is blown into the sealing unit 12 through the jet pipe 311; wherein the airflow blown out by the jet pipe 311 is discharged from the first return air channel, the second return air channel and the third return air channel respectively; in this way, a predetermined return channel is provided for the gas sprayed onto the sealing unit 12, so that the gas flow in the fuel injection assembly 20 is more stable.

[0061] Step S32: Lubricating oil is sprayed onto the sealing unit 12 through the oil spraying unit 22. This allows the sealing unit 12 to be blown away from the anti-detachment component 30 before the oil is sprayed onto the sealing unit 12. This prevents the sealing unit 12, whose outer surface is covered with oil, from contacting the anti-detachment component 30, thus ensuring the oil spraying effect.

[0062] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A valve core assembly system, wherein the valve core is used in a plunger pump, and one end of the valve core is attached to a swashplate via a slipper, characterized in that, The valve core assembly system includes: A valve core assembly includes a valve shaft unit and a sealing unit; the valve shaft unit includes a first shaft and a second shaft; the second shaft is connected to the first shaft; the outer diameter of the first shaft is larger than the outer diameter of the second shaft; the sealing unit is sleeved on the second shaft; the inner diameter of the sealing unit is smaller than the outer diameter of the first shaft and larger than the outer diameter of the second shaft. A plurality of oil injection units are distributed circumferentially along the outer periphery of the sealing unit; the oil injection units are spaced apart from the sealing unit; the spray direction of the oil injection units is radially toward the sealing unit. A jet pipe is sleeved on the outer periphery of the end of the second shaft away from the first shaft; a sealing unit is located between the first shaft and the jet pipe, and the jet pipe's ejection direction is axially toward the sealing unit, so that the sealing unit remains sleeved on the second shaft and within the effective injection range of the injection unit.

2. The valve core assembly system according to claim 1, characterized in that, The valve core assembly system includes an air jet unit; the air jet unit includes a flared tube and an air jet pipe; the flared tube is sleeved on the second shaft; the flared tube is coaxially connected to the ejection end of the air jet pipe; the inner diameter of the flared tube gradually increases along the ejection direction of the air jet pipe; the maximum inner diameter of the flared tube is smaller than the outer diameter of the sealing unit but larger than the inner diameter of the sealing unit.

3. The valve core assembly system according to claim 2, characterized in that, The valve core assembly system includes a support ring; the support ring is simultaneously sleeved on the outer periphery of the first shaft, the second shaft, and the jet pipe; the oil injection unit includes an oil supply part and a nozzle; the nozzle is connected to the oil supply part; the nozzle is connected to the support ring; the nozzle's spray direction is radially toward the sealing unit.

4. The valve core assembly system according to claim 3, characterized in that, The valve core assembly system includes an oil injection assembly; the oil injection assembly includes a support unit and the oil injection unit; the support unit includes a baffle, a clearance hole, and a support ring; the clearance hole passes through the baffle; the baffle is sleeved on the outer periphery of the first shaft through the clearance hole, and the baffle is connected to one end of the support ring.

5. A valve core assembly system according to claim 3, characterized in that, The valve core assembly system includes an anti-disengagement component; the anti-disengagement component includes a return air unit and the jet unit; the return air unit includes a return air pipe and a blocking ring; The return air pipe and the blocking ring are coaxially connected; the inner diameter of the blocking ring is greater than or equal to the inner diameter of the return air pipe; the return air pipe is sleeved on the outer periphery of the jet pipe; the inner diameter of the return air pipe is greater than the outer diameter of the jet pipe and the outer diameter of the flared pipe, respectively; the gap between the inner peripheral wall of the return air pipe and the outer peripheral wall of the jet pipe forms a first return air channel; the blocking ring is located at the end of the return air pipe facing the sealing unit; the inner diameter of the blocking ring is smaller than the outer diameter of the sealing unit.

6. A valve core assembly system according to claim 5, characterized in that, The projection of the end of the blocking ring facing the sealing unit along the second axis direction at least partially overlaps with the oil injection unit.

7. A valve core assembly system according to claim 5, characterized in that, The outer diameter of the blocking ring gradually increases along the ejection direction of the jet pipe; the minimum outer diameter of the blocking ring is the same as the outer diameter of the return air pipe.

8. A valve core assembly system according to claim 5, characterized in that, The distance from the flared tube along the second axis to the sealing unit is greater than the distance from the blocking ring along the second axis to the sealing unit.

9. A method for assembling a valve core assembly, characterized in that, The valve core assembly method is applied to the valve core assembly system according to any one of claims 1-8; the valve core assembly method includes: The sealing unit is fitted onto the second shaft; Move the valve core assembly so that the sealing unit is located between the plurality of the oil injection units, and fit the jet pipe onto the outer peripheral side of the second shaft; The sealing unit is purged with air through the jet pipe and lubricated with oil through the oil spraying unit. The valve core assembly is installed onto the plunger pump.

10. A valve core assembly assembly method according to claim 9, characterized in that, The valve core assembly system includes a support unit and an anti-detachment component; the support unit includes a baffle, a clearance hole, and a support ring; the anti-detachment component includes an air jet unit and a return air unit; the air jet unit includes a flared pipe and an air jet pipe; the return air unit includes a return air pipe and a blocking ring; the gap between the return air pipe and the air jet pipe forms a first return air channel; the gap between the return air pipe and the support ring forms a second return air channel; and the gap between the clearance hole and the first shaft forms a third return air channel.

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