Plunger pump

Abstract

A plunger pump, comprising a crankcase. The crankcase comprises a lower case body (2); a guideway is provided on the lower case body (2); a first lubricating oil passage communicated with the interior of the guideway is provided above the guideway; and a second lubricating oil passage communicated with the interior of the guideway is provided below the guideway. The first lubricating oil passage comprises a first main lubrication passage (4) and a plurality of first lubrication branch passages (5), wherein the first main lubrication passage (4) is separately communicated with each first lubrication branch passage (5), and one end of each first lubrication branch passage (5) is communicated with the guideway. The second lubricating oil passage comprises a second main lubrication passage (10) and a plurality of second lubrication branch passages (9), wherein the second main lubrication passage (10) is separately communicated with each second lubrication branch passage (9), and one end of each second lubrication branch passage (9) is communicated with the guideway. The plunger pump overcomes the technical problem in the prior art of poor lubrication performance because oil pressure and an effective lubricating oil film cannot be established due to the self-weight of a crosshead.

Description

A plunger pump Technical Field

[0001] This invention relates to the field of plunger pump technology, and in particular to a plunger pump. Background Technology

[0002] Emulsion pumps are a type of plunger pump used in coal mining faces to provide emulsions to hydraulic supports. An emulsion pump is a device that uses emulsions or water as a medium and relies on the rotation of a crankshaft to drive a plunger to reciprocate, thereby achieving liquid suction and discharge, and converting it into the hydraulic energy of the emulsion.

[0003] Currently, the power end structure of emulsion pumps is relatively mature. All emulsion pump manufacturers use crank-slider mechanisms, which have mature production processes and relatively low manufacturing costs. Among them, the crosshead and housing slide are the most critical and important mating friction pairs in the reciprocating power end of the emulsion pump. Their lubrication systems usually adopt a single "top-down" forced lubrication method, a pure "splash lubrication" method, or a combination of both. Due to the self-weight of the crosshead, the lubricating oil film cannot be fully established in the "cylindrical friction pair" formed by the crosshead and slide. In particular, the oil film formation quality on the lower semi-cylindrical surface of the crosshead is not high, and oil pressure and an effective lubricating oil film cannot be established. The lubrication effect is poor, and there is not enough lubricating oil to carry away the heat generated by friction, causing "cylinder scoring" failure. This failure occurs frequently in existing emulsion pump products. This failure requires shutdown, lifting to the surface for disassembly and repair, which seriously affects the coal mining production efficiency.

[0004] Chinese utility model patent CN213870161U discloses an emulsion pump and its power end. A third lubrication oil passage, connected to the slide rail of a slider via a forced lubrication system, is located on the crankshaft housing. The pump includes a third main lubrication oil passage and a third branch lubrication oil passage. The third branch lubrication oil passage intersects with the third main lubrication oil passage and connects to the slide rail of the slider. The third branch lubrication oil passage is formed as a straight hole and extends to the outside of the crankshaft housing. Its end is sealed with a plug. The crankshaft housing includes an upper housing and a lower housing. Oil is pumped in through an external pressure inlet, flows through the oil passage and into the slide rail. There is no oil flow to the lower side of the slide rail; the oil flows in by gravity, causing an unstable oil film to form on the lower side of the slider, resulting in friction and wear.

[0005] Chinese utility model patent CN205638888U discloses a five-plunger pump that uses splash lubrication. The gears on the crankshaft rotate, causing the oil in the housing to splash into the upper oil sump. The oil flows into the slider slide through the oil hole and into the lower side of the slide cavity by gravity. At the same time, lubricating oil is pumped in by the oil pump and enters the slide through the oil passage to lubricate the slider. However, there is also the problem of insufficient lubrication at the bottom of the slider. Summary of the Invention

[0006] The present invention aims to at least solve the technical problems existing in the prior art, such as the inability to establish oil pressure and an effective lubricating oil film due to the weight of the crosshead itself, resulting in poor lubrication and insufficient lubricating oil to remove the heat generated by friction, causing "cylinder scoring" failure.

[0007] Therefore, one object of the present invention is to provide a plunger pump, including a crankcase;

[0008] The crankcase includes a lower housing;

[0009] The lower housing is provided with a slide rail, and a first lubricating oil passage communicating with the interior of the slide rail is provided above the slide rail; a second lubricating oil passage communicating with the interior of the slide rail is provided below the slide rail.

[0010] Furthermore, the first lubrication circuit includes a first main lubrication circuit and a plurality of first branch lubrication circuits. One end of the first main lubrication circuit is connected to the lower housing. The first main lubrication circuit is connected to each of the first branch lubrication circuits, and one end of each first branch lubrication circuit is connected to the slide rail.

[0011] Furthermore, the second lubrication circuit includes a second main lubrication circuit and multiple second branch lubrication circuits. One end of the second main lubrication circuit is connected to the lower housing. The second main lubrication circuit is connected to each of the second branch lubrication circuits, and one end of each second branch lubrication circuit is connected to the slide rail.

[0012] Furthermore, the first lubrication main road and the second lubrication main road are arranged horizontally; the first lubrication branch road is inclined downward toward the slide rail; and the second lubrication branch road is inclined upward toward the slide rail.

[0013] Furthermore, the lower housing has a first external interface connected to the first lubrication main circuit, and a second external interface connected to the second lubrication main circuit. The first external interface and the second external interface are located on the same side of the lower housing.

[0014] Furthermore, the first lubrication branch and the second lubrication branch are symmetrical about the slide rail.

[0015] Furthermore, the other end of each of the first lubrication branches is connected to the lower housing, and the opening at the other end of the first lubrication branch is provided with a first screw plug.

[0016] Furthermore, the other end of each of the second lubrication branches is connected to the lower housing, and the opening at the other end of the second lubrication branch is provided with a second screw plug.

[0017] Furthermore, a cylinder liner is provided inside the lower housing, and the cylinder liner is disposed on the outer periphery of the slide rail;

[0018] The cylinder liner is provided with a first oil port that communicates with the interior of the slide rail, and the first oil port is connected to the first lubrication branch.

[0019] Furthermore, the cylinder liner is provided with a second oil port that communicates with the slide rail, and the second oil port is connected to the second lubrication branch.

[0020] The plunger pump of the present invention has the following beneficial effects:

[0021] This invention addresses the problem of low lubrication efficiency of the friction pair between the crosshead and the housing slide of existing emulsion pumps. It proposes a "bottom-up" forced lubrication structure that overcomes the weight of the crosshead itself. Combining "top-down" forced lubrication and splash lubrication, the friction pair formed by the crosshead and the housing slide is able to fully establish a lubricating oil film, achieving the effect of the crosshead "floating" and reciprocating in the housing slide. This solves the "cylinder scoring" fault of the crosshead and housing slide and improves the service life of the product. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 is a cross-sectional view of a plunger pump according to an embodiment of the present invention;

[0024] Figure 2 is a perspective view of a plunger pump according to an embodiment of the present invention.

[0025] Reference numerals in the attached diagram: 1. Upper housing; 2. Lower housing; 3. First plug; 4. First main lubrication line; 5. First branch lubrication line; 6. Cylinder liner; 7. First oil port; 8. Second oil port; 9. Second branch lubrication line; 10. Second main lubrication line; 11. Second plug. Detailed Implementation

[0026] Various aspects and features of the present invention are described herein with reference to the accompanying drawings.

[0027] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of the invention will be apparent to those skilled in the art.

[0028] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the invention and, together with the general description of the invention given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

[0029] These and other features of the invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0030] It should also be understood that although the invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0031] The above and other aspects, features and advantages of the invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0032] Specific embodiments of the invention are described below with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the invention, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the invention in various ways with substantially any suitable detailed structure.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0035] In the description of this invention, "a plurality of" means two or more.

[0036] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0037] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0038] In the description of this invention, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

[0040] Example 1

[0041] As shown in Figures 1-2, this embodiment provides a plunger pump, including a crankcase;

[0042] The crankcase includes a lower housing 2;

[0043] The lower housing 2 is provided with a slide rail, and a first lubricating oil passage is provided above the slide rail, which is connected to the interior of the slide rail; a second lubricating oil passage is provided below the slide rail, which is connected to the interior of the slide rail.

[0044] The oil is injected into the first lubrication circuit and the second lubrication circuit by an external power source, and then enters the slide rail. The upper and lower semi-cylindrical surfaces of the slide rail are injected with oil to establish an effective oil film between the slider and the cylinder liner, so as to fully lubricate and prevent friction and wear.

[0045] This invention provides a plunger pump with a lubrication oil passage leading to the slide from bottom to top, which can inject oil into the slide without relying on gravity, establish a stable oil film on the lower semi-cylindrical surface of the slide, provide effective lubrication, and prevent friction and wear of the slider.

[0046] This invention provides two lubrication oil circuits, ensuring that the slide has two oil injection channels, one from top to bottom and the other from bottom to top, which fully guarantees that both the upper and lower semi-cylindrical surfaces of the slide are adequately lubricated. Furthermore, the external interfaces of the two lubrication oil circuits are located on the same side of the crankcase, facilitating pipeline layout.

[0047] This invention addresses the problem of low lubrication efficiency of the friction pair between the crosshead and the housing slide of existing emulsion pumps. It proposes a "bottom-up" forced lubrication structure that overcomes the weight of the crosshead itself. Combining "top-down" forced lubrication and splash lubrication, the friction pair formed by the crosshead and the housing slide is able to fully establish a lubricating oil film, achieving the effect of the crosshead "floating" and reciprocating in the housing slide. This solves the "cylinder scoring" fault of the crosshead and housing slide and improves the service life of the product.

[0048] Example 2

[0049] As shown in Figures 1-2, this embodiment provides a plunger pump, including a crankcase;

[0050] The crankcase includes a lower housing 2;

[0051] The lower housing 2 is provided with a slide rail, and a first lubricating oil passage is provided above the slide rail, which is connected to the interior of the slide rail; a second lubricating oil passage is provided below the slide rail, which is connected to the interior of the slide rail.

[0052] The oil is injected into the first lubrication circuit and the second lubrication circuit by an external power source, and then enters the slide rail. The upper and lower semi-cylindrical surfaces of the slide rail are injected with oil to establish an effective oil film between the slider and the cylinder liner, so as to fully lubricate and prevent friction and wear.

[0053] This invention provides a plunger pump with a lubrication oil passage leading to the slide from bottom to top, which can inject oil into the slide without relying on gravity, establish a stable oil film on the lower semi-cylindrical surface of the slide, provide effective lubrication, and prevent friction and wear of the slider.

[0054] This invention provides two lubrication oil circuits, ensuring that the slide has two oil injection channels, one from top to bottom and the other from bottom to top, which fully guarantees that both the upper and lower semi-cylindrical surfaces of the slide are adequately lubricated. Furthermore, the external interfaces of the two lubrication oil circuits are located on the same side of the crankcase, facilitating pipeline layout.

[0055] This invention addresses the problem of low lubrication efficiency of the friction pair between the crosshead and the housing slide of existing emulsion pumps. It proposes a "bottom-up" forced lubrication structure that overcomes the weight of the crosshead itself. Combining "top-down" forced lubrication and splash lubrication, the friction pair formed by the crosshead and the housing slide is able to fully establish a lubricating oil film, achieving the effect of the crosshead "floating" and reciprocating in the housing slide. This solves the "cylinder scoring" fault of the crosshead and housing slide and improves the service life of the product.

[0056] The difference between this embodiment and the first embodiment is that:

[0057] The first lubrication circuit includes a first main lubrication circuit 4 and a plurality of first branch lubrication circuits 5. One end of the first main lubrication circuit 4 is connected to the lower housing 2. The first main lubrication circuit 4 is connected to each of the first branch lubrication circuits 5, and one end of each of the first branch lubrication circuits 5 is connected to the slide rail.

[0058] The second lubrication circuit includes a second main lubrication circuit 9 and a plurality of second branch lubrication circuits 10. One end of the second main lubrication circuit 9 is connected to the lower housing 2. The second main lubrication circuit 9 is connected to each of the second branch lubrication circuits 10, and one end of each second branch lubrication circuit 10 is connected to the slide rail.

[0059] The oil is injected into the first lubrication main line 4 and the second lubrication main line 10 by an external power source, and then enters the slide rail through the first lubrication branch line 5 and the second lubrication branch line 9 respectively. The upper and lower semi-cylindrical surfaces of the slide rail are injected with oil to establish an effective oil film between the slider and the cylinder liner in the slide rail, so as to fully lubricate and prevent friction and wear.

[0060] Example 3

[0061] As shown in Figures 1-2, this embodiment provides a plunger pump, including a crankcase;

[0062] The crankcase includes a lower housing 2;

[0063] The lower housing 2 is provided with a slide rail, and a first lubricating oil passage is provided above the slide rail, which is connected to the interior of the slide rail; a second lubricating oil passage is provided below the slide rail, which is connected to the interior of the slide rail.

[0064] The oil is injected into the first lubrication circuit and the second lubrication circuit by an external power source, and then enters the slide rail. The upper and lower semi-cylindrical surfaces of the slide rail are injected with oil to establish an effective oil film between the slider and the cylinder liner, so as to fully lubricate and prevent friction and wear.

[0065] This invention provides a plunger pump with a lubrication oil passage leading to the slide from bottom to top, which can inject oil into the slide without relying on gravity, establish a stable oil film on the lower semi-cylindrical surface of the slide, provide effective lubrication, and prevent friction and wear of the slider.

[0066] This invention provides two lubrication oil circuits, ensuring that the slide has two oil injection channels, one from top to bottom and the other from bottom to top, which fully guarantees that both the upper and lower semi-cylindrical surfaces of the slide are adequately lubricated. Furthermore, the external interfaces of the two lubrication oil circuits are located on the same side of the crankcase, facilitating pipeline layout.

[0067] This invention addresses the problem of low lubrication efficiency of the friction pair between the crosshead and the housing slide of existing emulsion pumps. It proposes a "bottom-up" forced lubrication structure that overcomes the weight of the crosshead itself. Combining "top-down" forced lubrication and splash lubrication, the friction pair formed by the crosshead and the housing slide is able to fully establish a lubricating oil film, achieving the effect of the crosshead "floating" and reciprocating in the housing slide. This solves the "cylinder scoring" fault of the crosshead and housing slide and improves the service life of the product.

[0068] The first lubrication circuit includes a first main lubrication circuit 4 and a plurality of first branch lubrication circuits 5. One end of the first main lubrication circuit 4 is connected to the lower housing 2. The first main lubrication circuit 4 is connected to each of the first branch lubrication circuits 5, and one end of each of the first branch lubrication circuits 5 is connected to the slide rail.

[0069] The second lubrication circuit includes a second main lubrication circuit 9 and a plurality of second branch lubrication circuits 10. One end of the second main lubrication circuit 9 is connected to the lower housing 2. The second main lubrication circuit 9 is connected to each of the second branch lubrication circuits 10, and one end of each second branch lubrication circuit 10 is connected to the slide rail.

[0070] The oil is injected into the first lubrication main line 4 and the second lubrication main line 10 by an external power source, and then enters the slide rail through the first lubrication branch line 5 and the second lubrication branch line 9 respectively. The upper and lower semi-cylindrical surfaces of the slide rail are injected with oil to establish an effective oil film between the slider and the cylinder liner in the slide rail, so as to fully lubricate and prevent friction and wear.

[0071] The difference between this embodiment and the second embodiment is that:

[0072] The first lubrication main line 4 and the second lubrication main line 10 are arranged horizontally to facilitate pipeline installation;

[0073] The first lubrication branch 5 is set perpendicular to the first lubrication main 4. This design can shorten the distance of oil flow.

[0074] The second lubrication branch 9 is perpendicular to the second lubrication main branch 10. This design can shorten the distance of oil flow.

[0075] The first lubrication branch 5 is inclined downward toward the slide rail; the second lubrication branch 9 is inclined upward toward the slide rail.

[0076] The lower housing 2 has a first external interface connected to the first lubrication main line 4, and the lower housing has a second external interface connected to the second lubrication main line 10. The first external interface and the second external interface are located on the same side of the lower housing for easy pipeline installation.

[0077] Example 4

[0078] As shown in Figures 1-2, this embodiment provides a plunger pump, including a crankcase;

[0079] The crankcase includes a lower housing 2;

[0080] The lower housing 2 is provided with a slide rail, and a first lubricating oil passage is provided above the slide rail, which is connected to the interior of the slide rail; a second lubricating oil passage is provided below the slide rail, which is connected to the interior of the slide rail.

[0081] The oil is injected into the first lubrication circuit and the second lubrication circuit by an external power source, and then enters the slide rail. The upper and lower semi-cylindrical surfaces of the slide rail are injected with oil to establish an effective oil film between the slider and the cylinder liner, so as to fully lubricate and prevent friction and wear.

[0082] This invention provides a plunger pump with a lubrication oil passage leading to the slide from bottom to top, which can inject oil into the slide without relying on gravity, establish a stable oil film on the lower semi-cylindrical surface of the slide, provide effective lubrication, and prevent friction and wear of the slider.

[0083] This invention provides two lubrication oil circuits, ensuring that the slide has two oil injection channels, one from top to bottom and the other from bottom to top, which fully guarantees that both the upper and lower semi-cylindrical surfaces of the slide are adequately lubricated. Furthermore, the external interfaces of the two lubrication oil circuits are located on the same side of the crankcase, facilitating pipeline layout.

[0084] This invention addresses the problem of low lubrication efficiency of the friction pair between the crosshead and the housing slide of existing emulsion pumps. It proposes a "bottom-up" forced lubrication structure that overcomes the weight of the crosshead itself. Combining "top-down" forced lubrication and splash lubrication, the friction pair formed by the crosshead and the housing slide is able to fully establish a lubricating oil film, achieving the effect of the crosshead "floating" and reciprocating in the housing slide. This solves the "cylinder scoring" fault of the crosshead and housing slide and improves the service life of the product.

[0085] The first lubrication circuit includes a first main lubrication circuit 4 and a plurality of first branch lubrication circuits 5. One end of the first main lubrication circuit 4 is connected to the lower housing 2. The first main lubrication circuit 4 is connected to each of the first branch lubrication circuits 5, and one end of each of the first branch lubrication circuits 5 is connected to the slide rail.

[0086] The second lubrication circuit includes a second main lubrication circuit 9 and a plurality of second branch lubrication circuits 10. One end of the second main lubrication circuit 9 is connected to the lower housing 2. The second main lubrication circuit 9 is connected to each of the second branch lubrication circuits 10, and one end of each second branch lubrication circuit 10 is connected to the slide rail.

[0087] The oil is injected into the first lubrication main line 4 and the second lubrication main line 10 by an external power source, and then enters the slide rail through the first lubrication branch line 5 and the second lubrication branch line 9 respectively. The upper and lower semi-cylindrical surfaces of the slide rail are injected with oil to establish an effective oil film between the slider and the cylinder liner in the slide rail, so as to fully lubricate and prevent friction and wear.

[0088] The first lubrication main line 4 and the second lubrication main line 10 are arranged horizontally to facilitate pipeline installation;

[0089] The first lubrication branch 5 is set perpendicular to the first lubrication main 4. This design can shorten the distance of oil flow.

[0090] The second lubrication branch 9 is perpendicular to the second lubrication main branch 10. This design can shorten the distance of oil flow.

[0091] The first lubrication branch 5 is inclined downward toward the slide rail; the second lubrication branch 9 is inclined upward toward the slide rail.

[0092] The lower housing 2 has a first external interface connected to the first lubrication main line 4, and the lower housing has a second external interface connected to the second lubrication main line 10. The first external interface and the second external interface are located on the same side of the lower housing for easy pipeline installation.

[0093] The difference between this embodiment and the third embodiment is that:

[0094] The crankcase also includes an upper housing 1 disposed on the lower housing 2;

[0095] The first lubrication branch and the second lubrication branch are symmetrical about the slide rail, which helps to maintain a consistent oil intake on the upper and lower cylindrical surfaces of the slide rail.

[0096] Example 5

[0097] As shown in Figures 1-2, this embodiment provides a plunger pump, including a crankcase;

[0098] The crankcase includes a lower housing 2;

[0099] The lower housing 2 is provided with a slide rail, and a first lubricating oil passage is provided above the slide rail, which is connected to the interior of the slide rail; a second lubricating oil passage is provided below the slide rail, which is connected to the interior of the slide rail.

[0100] The oil is injected into the first lubrication circuit and the second lubrication circuit by an external power source, and then enters the slide rail. The upper and lower semi-cylindrical surfaces of the slide rail are injected with oil to establish an effective oil film between the slider and the cylinder liner, so as to fully lubricate and prevent friction and wear.

[0101] This invention provides a plunger pump with a lubrication oil passage leading to the slide from bottom to top, which can inject oil into the slide without relying on gravity, establish a stable oil film on the lower semi-cylindrical surface of the slide, provide effective lubrication, and prevent friction and wear of the slider.

[0102] This invention provides two lubrication oil circuits, ensuring that the slide has two oil injection channels, one from top to bottom and the other from bottom to top, which fully guarantees that both the upper and lower semi-cylindrical surfaces of the slide are adequately lubricated. Furthermore, the external interfaces of the two lubrication oil circuits are located on the same side of the crankcase, facilitating pipeline layout.

[0103] This invention addresses the problem of low lubrication efficiency of the friction pair between the crosshead and the housing slide of existing emulsion pumps. It proposes a "bottom-up" forced lubrication structure that overcomes the weight of the crosshead itself. Combining "top-down" forced lubrication and splash lubrication, the friction pair formed by the crosshead and the housing slide is able to fully establish a lubricating oil film, achieving the effect of the crosshead "floating" and reciprocating in the housing slide. This solves the "cylinder scoring" fault of the crosshead and housing slide and improves the service life of the product.

[0104] The first lubrication circuit includes a first main lubrication circuit 4 and a plurality of first branch lubrication circuits 5. One end of the first main lubrication circuit 4 is connected to the lower housing 2. The first main lubrication circuit 4 is connected to each of the first branch lubrication circuits 5, and one end of each of the first branch lubrication circuits 5 is connected to the slide rail.

[0105] The second lubrication circuit includes a second main lubrication circuit 9 and a plurality of second branch lubrication circuits 10. One end of the second main lubrication circuit 9 is connected to the lower housing 2. The second main lubrication circuit 9 is connected to each of the second branch lubrication circuits 10, and one end of each second branch lubrication circuit 10 is connected to the slide rail.

[0106] The oil is injected into the first lubrication main line 4 and the second lubrication main line 10 by an external power source, and then enters the slide rail through the first lubrication branch line 5 and the second lubrication branch line 9 respectively. The upper and lower semi-cylindrical surfaces of the slide rail are injected with oil to establish an effective oil film between the slider and the cylinder liner in the slide rail, so as to fully lubricate and prevent friction and wear.

[0107] The first lubrication main line 4 and the second lubrication main line 10 are arranged horizontally to facilitate pipeline installation;

[0108] The first lubrication branch 5 is set perpendicular to the first lubrication main 4. This design can shorten the distance of oil flow.

[0109] The second lubrication branch 9 is perpendicular to the second lubrication main branch 10. This design can shorten the distance of oil flow.

[0110] The first lubrication branch 5 is inclined downward toward the slide rail; the second lubrication branch 9 is inclined upward toward the slide rail.

[0111] The lower housing 2 has a first external interface connected to the first lubrication main line 4, and the lower housing has a second external interface connected to the second lubrication main line 10. The first external interface and the second external interface are located on the same side of the lower housing for easy pipeline installation.

[0112] The crankcase also includes an upper housing 1 disposed on the lower housing 2;

[0113] The first lubrication branch and the second lubrication branch are symmetrical about the slide rail, which helps to maintain a consistent oil intake on the upper and lower cylindrical surfaces of the slide rail.

[0114] The difference between this embodiment and the fourth embodiment is that:

[0115] The other end of each of the first lubrication branches 5 is connected to the lower housing 2, and a first screw plug 3 is installed at the opening of the other end of the first lubrication branch 5.

[0116] The other end of each of the second lubrication branches 9 is connected to the lower housing 2, and a second screw plug 11 is installed at the opening of the other end of the second lubrication branch.

[0117] The lower housing 2 is provided with a cylinder liner 6, which is located on the outer periphery of the slide rail.

[0118] The cylinder liner 6 is provided with a first oil port 7 that communicates with the interior of the slide rail, and the first oil port 7 is connected to the first lubrication branch 5.

[0119] The cylinder liner 6 is provided with a second oil port 8 that communicates with the slide rail, and the second oil port 8 is connected to the second lubrication branch 9.

Claims

1. A piston pump characterized in that, Including the crankcase; The crankcase includes a lower housing; The lower housing is provided with a slide rail, and a first lubricating oil passage communicating with the interior of the slide rail is provided above the slide rail; a second lubricating oil passage communicating with the interior of the slide rail is provided below the slide rail.

2. The piston pump of claim 1, wherein, The first lubrication circuit includes a first main lubrication circuit and multiple first branch lubrication circuits. One end of the first main lubrication circuit is connected to the lower housing. The first main lubrication circuit is connected to each of the first branch lubrication circuits, and one end of each first branch lubrication circuit is connected to the slide rail.

3. The piston pump of claim 2, wherein, The second lubrication circuit includes a second main lubrication circuit and multiple second branch lubrication circuits. One end of the second main lubrication circuit is connected to the lower housing. The second main lubrication circuit is connected to each of the second branch lubrication circuits, and one end of each second branch lubrication circuit is connected to the slide rail.

4. The piston pump of claim 3, wherein, The first lubrication main road and the second lubrication main road are arranged horizontally; the first lubrication branch road is inclined downward toward the slide rail; the second lubrication branch road is inclined upward toward the slide rail.

5. The piston pump of claim 4, wherein, The lower housing has a first external interface connected to the first lubrication main line, and a second external interface connected to the second lubrication main line. The first external interface and the second external interface are located on the same side of the lower housing.

6. The piston pump of claim 3, wherein, The first lubrication branch and the second lubrication branch are symmetrical about the slide rail.

7. The piston pump of claim 2, wherein, The other end of each of the first lubrication branches is connected to the lower housing, and the opening at the other end of the first lubrication branch is provided with a first screw plug.

8. The piston pump of claim 3, wherein, The other end of each of the second lubrication branches is connected to the lower housing, and the opening at the other end of the second lubrication branch is provided with a second screw plug.

9. The piston pump of claim 3, wherein, The lower housing is equipped with a cylinder liner, which is located on the outer periphery of the slide rail. The cylinder liner is provided with a first oil port that communicates with the interior of the slide rail, and the first oil port is connected to the first lubrication branch.

10. The piston pump of claim 9, wherein, The cylinder liner is provided with a second oil port that communicates with the slide rail, and the second oil port is connected to the second lubrication branch.

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