Plunger pump and processing method

Abstract

The present invention relates to the technical field of aircraft plunger pumps, and in particular, to a plunger pump and a processing method. The plunger pump comprises a piston-cylinder assembly, a connecting assembly, and an oil distribution assembly. The piston unit and the cylinder unit of the piston-cylinder assembly are respectively arranged in the internal chamber of the housing unit. In the connecting assembly, the connecting hole penetrates the connecting disk along the axial direction of the connecting disk. The connecting holes are arranged at intervals around the central axis of the connecting disk along the circumference of the connecting disk. The second mounting hole penetrates the connecting disk along the central axis of the connecting disk. In the connecting disk, the inner annular wall of the first disk part is fixedly connected to the outer annular wall of the second disk part. A>B. A is the distance between one end of the first disk part on the first end face and the second end face. B is the distance between one end of the second disk part on the first end face and the second end face. The first end face of the connecting disk abuts against the oil distribution assembly, and the second end face is detachably connected to the cylinder unit. In this way, the problem of how to avoid abnormal wear of the distribution pair of the plunger pump is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft plunger pumps, and in particular to a plunger pump and a processing method thereof. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder body to change the volume of the sealed working chamber to achieve oil suction and oil pressure. The existing plunger pump is generally composed of a housing, a swash plate, a plunger, a cylinder, and an oil distributor. The intermittent oil supply to the cylinder is achieved by rotating the oil distributor, which can drive the plunger to perform piston movement in the cylinder. Since the abutment between the cylinder and the oil distributor needs to be sealed to avoid oil leakage, and the relative rotation of the cylinder and the oil distributor causes the abutment to be easily worn, in order to extend the service life and seal the oil, a distribution pair is often installed between the cylinder and the oil distributor. The distribution pair is generally made of wear-resistant metals such as copper and silver. The end face of the distribution pair close to the oil distributor is arc-shaped and concave, and is sealed by forming an oil film between the distribution pair and the oil distributor.

[0003] During the production process, the concave end face of the distribution pair needs to be silver-plated to extend its service life. During electroplating, due to the slots on the distribution pair, the charges near the slots are concentrated, and the adsorption force is strong, which can easily lead to uneven electroplating. As a result, in subsequent tests, the concave end face of the distribution pair near its center abuts against the oil distributor and produces debris, which causes the entire concave end face of the distribution pair to wear, affecting the sealing effect. Summary of the invention

[0004] In order to solve the problem of how to avoid abnormal wear of a flow distribution pair of a plunger pump, the present invention provides a plunger pump and a processing method.

[0005] In a first aspect, the present invention provides a plunger pump, the plunger pump comprising:

[0006] A piston-cylinder assembly, the piston-cylinder assembly comprising a housing unit, a piston unit, and a cylinder unit; the piston unit and the cylinder unit are respectively arranged in the internal chamber of the housing unit; the cylinder unit comprises a cylinder body, a piston hole, and a first mounting hole; the piston hole penetrates the cylinder body; the piston holes are arranged at intervals around the central axis of the cylinder body along the circumference of the cylinder body; the first mounting hole penetrates the cylinder body along the central axis of the cylinder body; one end of the piston unit is detachably connected to the inner wall of the housing unit, and the other end partially extends into the piston hole;

[0007] A connecting assembly, the connecting assembly comprising a connecting disk, a second mounting hole, and a connecting hole; the connecting hole penetrates the connecting disk along the axial direction of the connecting disk; the connecting holes are spaced around the central axis of the connecting disk along the circumference of the connecting disk; the second mounting hole penetrates the connecting disk along the central axis of the connecting disk; the connecting hole is connected to the piston hole; the second mounting hole is connected to the first mounting hole; the two ends of the connecting disk are respectively a first end face and a second end face; the second end face of the connecting disk is detachably connected to an end of the cylinder body away from the piston unit; the first end face of the connecting disk is recessed in a direction close to the second end face; the connecting disk comprises a first disk portion and a second disk portion; the inner annular wall of the first disk portion is fixedly connected to the outer annular wall of the second disk portion; A>B; A is the distance between one end of the first disk portion on the first end face and the second end face; B is the distance between one end of the second disk portion on the first end face and the second end face;

[0008] An oil separation component, one end of which is detachably connected to the inner wall of the housing unit, and the other end of which is in contact with the first disc; the oil separation component is used to divide and adjust the oil in the plunger pump.

[0009] In some embodiments, the connecting disk also includes a third disk portion and a fourth disk portion; the inner annular wall of the second disk portion is fixedly connected to the outer annular wall of the third disk portion; the inner annular wall of the third disk portion is fixedly connected to the outer annular wall of the fourth disk portion; the connecting holes are arranged on the third disk portion at intervals along the circumference of the connecting disk; wherein B≥C≥D; C is the distance between one end of the third disk portion on the first end face and the second end face; D is the distance between one end of the fourth disk portion on the first end face and the second end face.

[0010] In some embodiments, C gradually decreases from a side of the third disk portion close to the second disk portion toward a direction close to the fourth disk portion.

[0011] In some embodiments, 2 μm ≤ (AB) ≤ 5 μm.

[0012] In some embodiments, 0≤(BD)≤(AB).

[0013] In some embodiments, Sb≥2Sa; wherein Sa is the cross-sectional area of ​​the first disk portion, and Sb is the cross-sectional area of ​​the second disk portion.

[0014] In some embodiments, Sb≥Sd≥Sc; wherein Sc is the cross-sectional area of ​​the third disk portion, and Sd is the cross-sectional area of ​​the fourth disk portion.

[0015] In a second aspect, the present invention provides a plunger pump processing method, which is applied to a plunger pump described in any one of the above embodiments, and the plunger pump processing method includes:

[0016] Step S10, based on the processing requirements of the processing body, turning the first end face of the processing body; wherein the processing body is a workpiece to be processed of the connecting assembly; the two ends of the processing body are the first end face and the second end face respectively; the first end face is concave in a direction close to the second end face;

[0017] Step S20, based on the completion of turning of the first end face, post-processing the first end face; wherein the post-processing includes electroplating and grinding the first end face;

[0018] Step S30, based on the completion of the post-processing of the first end surface, obtain a connecting assembly and assemble the connecting assembly with a piston cylinder assembly and an oil separation assembly.

[0019] In some embodiments, step S20 includes:

[0020] Step S21, electroplating the first end surface based on the completion of turning of the first end surface;

[0021] Step S22, based on the completion of electroplating on the first end surface, the first end surface is entirely ground;

[0022] Step S23, based on the completion of the overall grinding of the first end surface, the second disk portion on the first end surface is ground to A>B; wherein A is the distance between one end of the first disk portion on the first end surface and the second end surface; B is the distance between one end of the second disk portion on the first end surface and the second end surface.

[0023] In some embodiments, the step S20 further includes:

[0024] Step S24, based on the completion of grinding of the second disk portion, grind the third disk portion and the fourth disk portion on the first end face in sequence to B≥C≥D; wherein the connecting disk also includes the third disk portion and the fourth disk portion; the inner annular wall of the second disk portion is fixedly connected to the outer annular wall of the third disk portion; the inner annular wall of the third disk portion is fixedly connected to the outer annular wall of the fourth disk portion; the connecting holes are arranged on the third disk portion at intervals along the circumference of the connecting disk; C is the distance between one end of the third disk portion on the first end face and the second end face; D is the distance between one end of the fourth disk portion on the first end face and the second end face.

[0025] In order to solve the problem of how to avoid abnormal wear of the flow distribution pair of the plunger pump, the present invention has the following advantages:

[0026] The connecting plate of the connecting component (i.e., the distribution pair) of the plunger pump is arranged to be a stepped concave, so that the distance between one end of the first plate portion on the first end face and the second end face is greater than the distance between one end of the second plate portion on the first end face and the second end face, so that after the electroplating of the first end face of the connecting plate is completed, even if the electroplating layer is uneven, the first plate portion still maintains abutment with the oil separator plate to play a supporting role, so that the second plate portion is still spaced apart from the oil separator plate, ensuring that an oil film can be formed between the second plate portion and the oil separator plate to play a sealing role, thereby reducing the risk of abnormal wear of the connecting plate due to the abutment of the second plate portion with the oil separator plate after electroplating. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a plunger pump according to an embodiment is shown;

[0028] Figure 2 A partial schematic diagram of a plunger pump according to an embodiment is shown;

[0029] Figure 3 A schematic diagram of a connection assembly according to an embodiment is shown;

[0030] Figure 4 A schematic diagram of a connection assembly of another embodiment is shown;

[0031] Figure 5 A schematic flow chart of a plunger pump processing method according to an embodiment is shown.

[0032] Figure markings: 01 piston-cylinder assembly; 11 housing unit; 12 piston unit; 121 plunger; 122 swash plate; 123 transmission shaft; 13 cylinder unit; 131 cylinder body; 132 piston hole; 133 first mounting hole; 02 connecting assembly; 21 connecting plate; 211 first plate portion; 212 second plate portion; 213 third plate portion; 214 fourth plate portion; 22 second mounting hole; 23 connecting hole; 03 oil distribution assembly; 31 oil distribution plate; 32 oil distribution hole; 33 third mounting hole. DETAILED DESCRIPTION

[0033] 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, rather than implying any limitation on the scope of the present disclosure.

[0034] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part 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 orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. 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 directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, 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 and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0035] In this embodiment, the cylinder unit 13 of the plunger pump needs to be movably connected to the oil separator 31 via the connecting disk 21, and the connecting disk 21 and the oil separator 31 are sealed by an oil film. The connecting disk 21 may be made of copper, and one end surface close to the oil separator 31 needs to be silver-plated to extend the service life. However, if the connecting disk 21 is arc-shaped and concave, during electroplating, since the connecting hole 23 is opened on the connecting disk 21, the charge near the connecting hole 23 is concentrated, and the adsorption force is strong, which may easily lead to uneven electroplating layer, affecting the sealing effect and abnormal wear during subsequent use. To this end, this embodiment discloses a plunger pump. Figure 1As shown, the plunger pump may include a piston-cylinder assembly 01, a connecting assembly 02, and an oil distribution assembly 03. The piston-cylinder assembly 01 may include a housing unit 11, a piston unit 12, and a cylinder unit 13. The piston unit 12 and the cylinder unit 13 are respectively arranged in the internal chamber of the housing unit 11. The cylinder unit 13 may include a cylinder body 131, a piston hole 132, and a first mounting hole 133. The piston hole 132 passes through the cylinder body 131. The piston holes 132 are arranged at intervals around the central axis of the cylinder body 131 along the circumference of the cylinder body 131. The first mounting hole 133 penetrates the cylinder body 131 along the central axis of the cylinder body 131. One end of the piston unit 12 is detachably connected to the inner wall of the housing unit 11, and the other end partially extends into the piston hole 132. In other embodiments, the piston unit 12 may include a plunger 121, a swash plate 122, and a drive shaft 123; one end of the plunger 121 is detachably connected to one side of the swash plate 122; the side of the swash plate 122 away from the plunger 121 is detachably connected to the inner wall of the housing unit 11; one end of the drive shaft 123 is connected to an external drive, and the other end passes through the housing unit 11, the swash plate 122, and the cylinder unit 13 in sequence; the end of the plunger 121 away from the swash plate 122 extends into the piston hole 132.

[0036] like Figure 2 , Figure 3 As shown, the connection assembly 02 includes a connection disk 21, a second mounting hole 22, and a connection hole 23. The connection hole 23 penetrates the connection disk 21 along the axial direction of the connection disk 21. The connection holes 23 are spaced around the central axis of the connection disk 21 along the circumference of the connection disk 21. The second mounting hole 22 penetrates the connection disk 21 along the central axis of the connection disk 21. The two ends of the connection disk 21 are respectively a first end face and a second end face. The second end face of the connection disk 21 is detachably connected to an end of the cylinder body 131 away from the piston unit 12. The first end face of the connection disk 21 is recessed in a direction close to the second end face. The connection disk 21 includes a first disk portion 211 and a second disk portion 212. The inner annular wall of the first disk portion 211 is fixedly connected to the outer annular wall of the second disk portion 212. As shown Figure 4 As shown, A>B. A is the distance between one end of the first disc portion 211 on the first end surface and the second end surface. B is the distance between one end of the second disc portion 212 on the first end surface and the second end surface. Thus, the heights of the first disc portion 211 and the second disc portion 212 on the same reference surface can be different, and can be stepped, so that when the first end surface is subsequently electroplated, even if the electroplating layer is uneven, A>B can still be ensured, thereby avoiding the abutment and wear of the second disc portion 212 and the oil distribution disc 31, which affects the sealing effect and service life of the connecting disc 21.

[0037] One end of the oil separation component 03 is detachably connected to the inner wall of the housing unit 11, and the other end is in contact with the first disk 211; the oil separation component 03 is used to divide and adjust the oil in the plunger pump. Figure 2As shown, the oil separation assembly 03 includes an oil separation plate 31, an oil separation hole 32, and a third mounting hole 33. The oil separation hole 32 penetrates the oil separation plate 31. The oil separation holes 32 are arranged at intervals around the central axis of the oil separation plate 31 along the circumference of the oil separation plate 31. The third mounting hole 33 penetrates the oil separation plate 31 along the central axis of the oil separation plate 31. One end of the oil separation plate 31 abuts against the end of the first plate portion 211 away from the cylinder body 131. The piston hole 132, the connecting hole 23, and the oil separation hole 32 are connected in sequence. The first mounting hole 133, the second mounting hole 22, and the third mounting hole 33 are connected in sequence. The transmission shaft 123 passes through the first mounting hole 133, the second mounting hole 22, and the third mounting hole 33 in sequence and is detachably connected to the oil separation plate 31. Therefore, the oil separation plate 31 can be driven to rotate by the central shaft transmission, and the oil can flow through the oil separation hole 32, the connecting hole 23, and the piston hole 132 to drive the plunger 121 to perform piston movement in the cylinder body 131. The first plate portion 211 abuts against the oil separation plate 31 to play a supporting role, and the oil can form an oil film in the interval area between the second plate portion 212 and the oil separation plate 31 for sealing to prevent the oil from leaking outward.

[0038] In this embodiment, if Figure 2 As shown, the connecting disk 21 further includes a third disk portion 213 and a fourth disk portion 214; the inner annular wall of the second disk portion 212 is fixedly connected to the outer annular wall of the third disk portion 213; the inner annular wall of the third disk portion 213 is fixedly connected to the outer annular wall of the fourth disk portion 214; the connecting holes 23 are arranged on the third disk portion 213 at intervals along the circumferential direction of the connecting disk 21; wherein, as Figure 3 As shown, B≥C≥D; C is the distance between one end of the third disc 213 on the first end face and the second end face; D is the distance between one end of the fourth disc 214 on the first end face and the second end face. Since multiple connection holes 23 are arranged at intervals on the third disc 213, when the first end face of the connection disc 21 is electroplated, the charge near the opening of the connection hole 23 is relatively concentrated, and the strong adsorption force easily causes the electroplating layer to be uneven. This arrangement can keep the third disc 213 and the fourth disc 214 spaced apart from the oil separation disc 31, which can reduce the risk of the electroplating layer of the third disc 213 or the fourth disc 214 abutting against the oil separation disc 31 after electroplating, and ensure that a well-sealed oil film can be formed between the fourth disc 214 and the oil separation disc 31 to prevent oil from leaking inward.

[0039] In this embodiment, if Figure 4 As shown, C gradually decreases from the side of the third plate portion 213 close to the second plate portion 212 toward the direction close to the fourth plate portion 214. This allows the third plate portion 213 to smoothly connect the second plate portion 212 and the fourth plate portion 214, and reduces the risk of uneven electroplating due to strong adsorption caused by concentrated charges on the third plate portion 213 during electroplating.

[0040] In this embodiment, if Figure 4As shown, 2μm≤(AB)≤5μm, that is, the difference between the spacing between one end of the first disk portion 211 on the first end surface and the second end surface and the spacing between one end of the second disk portion 212 on the first end surface and the second end surface is taken as the first difference, and the maximum value of the first difference can be 5 microns, and the minimum value can be 2 microns. Thus, it can be ensured that the first disk portion 211 plays a supporting role, while the second disk portion 212 is spaced from the oil separation disk 31 after electroplating, and an oil film with good sealing effect can be formed between the second disk portion 212 and the oil separation disk 31, thereby reducing the risk of abnormal wear of the connecting disk 21 and ensuring the reliability of the connecting disk 21.

[0041] In this embodiment, if Figure 4 As shown, 0≤(BD)≤(AB), that is, the difference between the spacing between one end of the second disc portion 212 on the first end face and the second end face and the spacing between one end of the fourth disc portion 214 on the first end face and the second end face is taken as the second difference, so that the second difference is at least smaller than the first difference. Due to the processing tolerance in the manufacturing process of the oil separator 31, there may be a protrusion of about 1 micron at one end close to the connecting disc 21, and the closer to the center of the oil separator 31, the more obvious the protrusion. This setting can prevent the fourth disc portion 214 from abutting against the oil separator 31 after electroplating, and reduce the risk of abnormal wear of the connecting disc 21.

[0042] In this embodiment, if Figure 3 As shown, Sb≥2Sa, wherein Sa is the cross-sectional area of ​​the first disc portion 211, and Sb is the cross-sectional area of ​​the second disc portion 212. The cross-sectional area of ​​the second disc portion 212 is at least twice the cross-sectional area of ​​the first disc portion 211, thereby ensuring that the second disc portion 212 has sufficient area to form a well-sealed oil film with the oil separation disc 31 during use.

[0043] In this embodiment, if Figure 3 As shown, Sb≥Sd≥Sc, where Sc is the cross-sectional area of ​​the third disc portion 213, and Sd is the cross-sectional area of ​​the fourth disc portion 214. The cross-sectional area of ​​the fourth disc portion 214 is at least greater than the cross-sectional area of ​​the third disc portion 213, thereby ensuring that the fourth disc portion 214 has sufficient area to form a well-sealed oil film with the oil separation disc 31 during use.

[0044] In this embodiment, this example discloses a plunger pump processing method, which can be applied to any plunger pump in the above embodiments. Figure 5 As shown, the plunger pump processing method may include steps S10 to S30. The above steps may be described in detail below:

[0045] Step S10, based on the processing requirements of the processing body, turning the first end face of the processing body; wherein the processing body is the workpiece to be processed of the connecting component 02; the two ends of the processing body are respectively the first end face and the second end face; the first end face is recessed in the direction close to the second end face; thereby, there is a sufficient area between the first end face and the oil separator 31 to form a sealing oil film to prevent oil leakage to the outside.

[0046] Step S20, based on the completion of turning of the first end face, post-processing the first end face; wherein the post-processing includes electroplating and grinding the first end face; electroplating is used to further increase the wear resistance of the first end face. Grinding can improve the flatness and roughness of the first end face, and ensure that the second disk portion 212 on the first end face will not abut against the oil distribution disk 31 after assembly, thereby avoiding abnormal wear of the connecting disk 21.

[0047] Step S30, based on the completion of the post-processing of the first end surface, obtain the connection assembly 02 and assemble the connection assembly 02 with the piston cylinder assembly 01 and the oil separation assembly 03. The second end surface of the connection assembly 02 is detachably connected to one end of the cylinder unit 13, and the first plate portion 211 on the first end surface is in contact with the oil separation plate 31.

[0048] In this embodiment, step S20 may include:

[0049] Step S21, electroplating the first end surface based on the completion of turning of the first end surface;

[0050] Step S22, based on the completion of electroplating on the first end surface, the first end surface is entirely ground;

[0051] Step S23, based on the completion of the overall grinding of the first end surface, the second disc portion 212 on the first end surface is ground to A>B; wherein A is the distance between one end of the first disc portion 211 on the first end surface and the second end surface; B is the distance between one end of the second disc portion 212 on the first end surface and the second end surface. By further grinding the second disc portion 212, the unevenness of the electroplating layer surface of the second disc portion 212 is reduced as much as possible, ensuring that A>B, avoiding the second disc portion 212 from abutting against the oil distribution disc 31, and reducing the risk of abnormal wear of the connecting disc 21 and sealing failure.

[0052] In this embodiment, step S20 may further include:

[0053] Step S24, based on the completion of grinding of the second disk portion 212, the third disk portion 213 and the fourth disk portion 214 on the first end face are ground in sequence to B≥C≥D; wherein, the connecting disk 21 also includes a third disk portion 213 and a fourth disk portion 214; the inner annular wall of the second disk portion 212 is fixedly connected to the outer annular wall of the third disk portion 213; the inner annular wall of the third disk portion 213 is fixedly connected to the outer annular wall of the fourth disk portion 214; the connecting holes 23 are arranged on the third disk portion 213 at intervals along the circumference of the connecting disk 21; C is the distance between one end of the third disk portion 213 on the first end face and the second end face; D is the distance between one end of the fourth disk portion 214 on the first end face and the second end face. By further grinding the third disk portion 213 and the fourth disk portion 214, the unevenness of the electroplating layer surface of the third disk portion 213 and the fourth disk portion 214 can be reduced as much as possible, ensuring A>B≥C≥D, thereby avoiding the third disk portion 213 and / or the fourth disk portion 214 from abutting against the oil separator 31, reducing the risk of abnormal wear of the connecting disk 21 and sealing failure.

[0054] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A plunger pump, characterized in that: The plunger pump comprises: A piston-cylinder assembly, the piston-cylinder assembly comprising a housing unit, a piston unit, and a cylinder unit; the piston unit and the cylinder unit are respectively arranged in the internal chamber of the housing unit; the cylinder unit comprises a cylinder body, a piston hole, and a first mounting hole; the piston hole penetrates the cylinder body; the piston holes are arranged at intervals around the central axis of the cylinder body along the circumference of the cylinder body; the first mounting hole penetrates the cylinder body along the central axis of the cylinder body; one end of the piston unit is detachably connected to the inner wall of the housing unit, and the other end partially extends into the piston hole; A connecting assembly, the connecting assembly comprising a connecting disk, a second mounting hole, and a connecting hole; the connecting hole penetrates the connecting disk along the axial direction of the connecting disk; the connecting holes are arranged at intervals around the central axis of the connecting disk along the circumference of the connecting disk; the second mounting hole penetrates the connecting disk along the central axis of the connecting disk; the connecting hole is connected to the piston hole; the second mounting hole is connected to the first mounting hole; the two ends of the connecting disk are respectively a first end face and a second end face; the second end face of the connecting disk is detachably connected to an end of the cylinder body away from the piston unit; the first end face of the connecting disk is recessed in a direction close to the second end face; the connecting disk comprises a first disk portion and a second disk portion; the inner annular wall of the first disk portion is fixedly connected to the outer annular wall of the second disk portion; A>B; A is the distance between one end of the first disk portion on the first end face and the second end face; B is the distance between one end of the second disk portion on the first end face and the second end face; the first disk portion and the second disk portion form a stepped structure on the first end face; An oil separation component, one end of which is detachably connected to the inner wall of the housing unit, and the other end of which is in contact with the first disc; the oil separation component is used to divide and adjust the oil in the plunger pump; The connecting disk also includes a third disk portion and a fourth disk portion; the inner annular wall of the second disk portion is fixedly connected to the outer annular wall of the third disk portion; the inner annular wall of the third disk portion is fixedly connected to the outer annular wall of the fourth disk portion; the connecting holes are arranged on the third disk portion at intervals along the circumference of the connecting disk; wherein B>C>D; C is the distance between one end of the third disk portion on the first end face and the second end face; D is the distance between one end of the fourth disk portion on the first end face and the second end face; the second disk portion, the third disk portion, the fourth disk portion and the oil separation assembly are arranged at intervals; an oil film seal is formed between the second disk portion, the fourth disk portion and the oil separation assembly.

2. A plunger pump according to claim 1, characterized in that: C gradually decreases from the side of the third disc portion close to the second disc portion toward the direction close to the fourth disc portion.

3. A plunger pump according to claim 1, characterized in that: 2μm≤(AB)≤5μm.

4. A plunger pump according to claim 3, characterized in that: 0≤(BD)≤(AB).

5. A plunger pump according to claim 1, characterized in that: Sb≥2Sa; wherein Sa is the cross-sectional area of ​​the first disc portion, and Sb is the cross-sectional area of ​​the second disc portion.

6. A plunger pump according to claim 5, characterized in that: Sb≥Sd≥Sc; wherein Sc is the cross-sectional area of ​​the third disc portion, and Sd is the cross-sectional area of ​​the fourth disc portion.

7. A plunger pump processing method, the plunger pump processing method is applied to a plunger pump as claimed in any one of claims 1 to 6, characterized in that: The plunger pump processing method comprises: Step S10, based on the processing requirements of the processing body, turning the first end face of the processing body; wherein the processing body is a workpiece to be processed of the connecting assembly; the two ends of the processing body are the first end face and the second end face respectively; the first end face is concave in a direction close to the second end face; Step S20, based on the completion of turning of the first end face, post-processing the first end face; wherein the post-processing includes electroplating and grinding the first end face; Step S30, based on the completion of the post-processing of the first end surface, obtain a connecting assembly and assemble the connecting assembly with a piston cylinder assembly and an oil separation assembly.

8. A plunger pump processing method according to claim 7, characterized in that: The step S20 comprises: Step S21, electroplating the first end surface based on the completion of turning of the first end surface; Step S22, based on the completion of electroplating on the first end surface, the first end surface is entirely ground; Step S23, based on the completion of the overall grinding of the first end surface, the second disk portion on the first end surface is ground to A>B; wherein A is the distance between one end of the first disk portion on the first end surface and the second end surface; B is the distance between one end of the second disk portion on the first end surface and the second end surface.

9. A plunger pump processing method according to claim 8, characterized in that: The step S20 further includes: Step S24, based on the completion of grinding of the second disc portion, the third disc portion and the fourth disc portion on the first end surface are sequentially ground to B>C>D.

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