Plunger pump

Abstract

The invention relates to the technical field of plunger pumps, and discloses a plunger pump which comprises a crank case, and the crank case comprises a lower case body; a slide way is arranged on the lower box body, and a first lubricating oil way communicated with the interior of the slide way is arranged above the slide way; a second lubricating oil way communicated with the interior of the sliding way is arranged below the sliding way. The first lubricating oil way comprises a first lubricating main way and a plurality of first lubricating branches, the first lubricating main way is communicated with each first lubricating branch, and one end of each first lubricating branch is communicated with the sliding way. The second lubricating oil way comprises a second lubricating main way and a plurality of second lubricating branch ways, the second lubricating main way is communicated with each second lubricating branch way, and one end of each second lubricating branch way is communicated with the sliding way. The technical problems that in the prior art, due to the self-weight effect of the crosshead, oil pressure and an effective lubricating oil film cannot be established, and the lubricating effect is poor are solved.

Description

Technical Field

[0001] The invention relates to the technical field of plunger pumps, in particular to a plunger pump. Background Art

[0002] The emulsion pump is a type of plunger pump, which is used in coal mining working faces to provide emulsion for hydraulic supports. The emulsion pump uses emulsion or water as the medium, and relies on the rotation of the crankshaft to drive the plunger to do reciprocating motion to achieve liquid suction and discharge, which is then converted into hydraulic energy of the emulsion.

[0003] At present, the structure of the power end of the emulsion pump is relatively mature. All emulsion pump manufacturers use a crank slider mechanism with mature production technology and relatively low manufacturing cost. Among them, the crosshead and the box slide are the most critical and important matching friction pairs in the reciprocating power end of the emulsion pump. Its lubrication system usually adopts a single "top-down" forced lubrication or a pure "splash lubrication" method, or a combination of the two. Due to the deadweight of the crosshead itself, the lubricating oil film cannot be fully established in the "cylindrical friction pair" formed by the crosshead and the slide, especially the oil film formation quality of the lower semi-cylindrical surface of the crosshead is not high, and the oil pressure and 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 the "cylinder pulling" failure, which occurs frequently in existing emulsion pump products, and this failure requires shutdown, lifting and disassembly for maintenance, which seriously affects the coal mining production efficiency in the mine.

[0004] Chinese utility model patent CN213870161U discloses an emulsion pump and its power end. The third lubricating oil circuit connected to the slideway of the slider through a forced lubrication system is arranged on the crankcase, including: a third main lubricating oil circuit and a third branch lubricating oil circuit. The third branch lubricating oil circuit intersects with the third main lubricating oil circuit and is connected to the slideway of the slider. The third branch lubricating oil circuit is formed as a straight hole and extends to the outside of the crankcase. Its end is blocked by a plug. The crankcase includes an upper case and a lower case. The oil is pumped into the oil port by external pressure, passes through the oil circuit and flows into the slideway. There is no oil on the lower side of the slideway. The oil flows into the lower side of the slideway by gravity, causing the lower side of the slider to be unable to form an oil film stably, causing friction and wear.

[0005] Chinese utility model patent CN205638888U discloses a five-plunger pump. Through splash lubrication, the gears on the crankshaft rotate, driving the oil in the housing to splash into the oil pool above. The oil flows into the slider slide through the oil hole and flows into the lower side of the slide cavity by gravity. At the same time, the lubricating oil is pumped into the slide through the oil circuit by the oil pump, and the oil is passed into the slide for lubrication of the slide 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 that due to the deadweight of the crosshead itself, oil pressure and 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 pulling" failure.

[0007] To this end, an object of the present invention is to provide a plunger pump, comprising a crankcase;

[0008] The crankcase includes a lower case;

[0009] The lower box body is provided with a slideway, and a first lubricating oil path communicating with the interior of the slideway is provided above the slideway; and a second lubricating oil path communicating with the interior of the slideway is provided below the slideway.

[0010] Furthermore, the first lubricating oil circuit includes a first lubricating main circuit and a plurality of first lubricating branch circuits, one end of the first lubricating main circuit is connected to the lower box body; the first lubricating main circuit is respectively connected to each of the first lubricating branch circuits, and one end of each of the first lubricating branch circuits is connected to the slideway.

[0011] Furthermore, the second lubricating oil circuit includes a second lubricating main circuit and a plurality of second lubricating branch circuits, one end of the second lubricating main circuit is connected to the lower box body; the second lubricating main circuit is respectively connected to each of the second lubricating branch circuits, and one end of each of the second lubricating branch circuits is connected to the slideway.

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

[0013] Furthermore, the lower box body is provided with a first external interface connected to the first lubrication main circuit, and the lower box body is provided with a second external interface connected to the second lubrication main circuit, and the first external interface and the second external interface are arranged on the same side of the lower box body.

[0014] Furthermore, the first lubrication branch and the second lubrication branch are vertically symmetrical relative to the slideway.

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

[0017] Furthermore, a cylinder sleeve is arranged inside the lower box, and the cylinder sleeve is arranged on the outer periphery of the slideway;

[0018] The cylinder sleeve is provided with a first oil passage communicating with the interior of the slideway, and the first oil passage is connected to the first lubrication branch.

[0019] Furthermore, the cylinder sleeve is provided with a second oil passage communicating with the slideway, and the second oil passage is connected to a second lubrication branch.

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

[0021] In view of the problem of low lubrication efficiency of the friction pair between the crosshead and the box slide at the power end of the existing emulsion pump, the present invention proposes a "bottom-up" forced lubrication structure that overcomes the crosshead's own gravity, combines "top-down" forced lubrication and splash lubrication, so that the friction pair formed by the crosshead and the box slide can fully establish a lubricating oil film, achieve the effect of "floating" reciprocating motion of the crosshead in the box slide, solve the "cylinder pulling" failure of the crosshead and the box slide, and increase the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

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

[0024] Figure 2 It is a stereoscopic diagram of a plunger pump in an embodiment of the present invention.

[0025] Reference numerals:

[0026] 1. Upper housing; 2. Lower housing; 3. First screw plug; 4. First main lubrication circuit; 5. First branch lubrication circuit; 6. Cylinder sleeve; 7. First oil port; 8. Second oil port; 9. Second branch lubrication circuit; 10. Second main lubrication circuit; 11. Second screw plug. DETAILED DESCRIPTION

[0027] Various aspects and features of the present invention are described herein with reference to the accompanying drawings.

[0028] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of the embodiments. Other modifications within the scope and spirit of the present invention will occur to those skilled in the art.

[0029] The accompanying drawings, which are incorporated in and constitute a part of the 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.

[0030] These and other characteristics of the invention will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the accompanying drawings.

[0031] It should also be understood that, although the invention has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the invention that have the characteristics recited in the claims and are therefore within the scope of protection defined thereby.

[0032] The above and other aspects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0033] Specific embodiments of the present invention are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present invention, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present invention with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of ways with substantially any suitable detailed structure.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0036] In the description of the present invention, "plurality" means two or more.

[0037] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0038] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0039] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0041] Example 1

[0042] like Figure 1-Figure 2 As shown, this embodiment provides a plunger pump, including a crankcase;

[0043] The crankcase includes a lower case 2;

[0044] The lower box body 2 is provided with a slideway, a first lubricating oil circuit is provided above the slideway, and the first lubricating oil circuit is connected to the inside of the slideway; a second lubricating oil circuit is provided below the slideway, and the second lubricating oil circuit is connected to the inside of the slideway.

[0045] The oil is injected into the first lubricating oil circuit and the second lubricating oil circuit by an external power source, and then enters the slideway, and the upper and lower cylindrical surfaces of the slideway are respectively injected with oil to establish an effective oil film between the slider and the cylinder sleeve, which is fully lubricated to prevent friction and wear.

[0046] The present invention forces a plunger pump to be provided with a lubricating oil passage from bottom to top leading to the slideway, and the oil can be injected into the slideway without relying on gravity, so as to establish a stable oil film on the lower semi-cylindrical surface of the slideway, provide effective lubrication, and prevent friction and wear of the slider;

[0047] The present invention arranges two lubricating oil circuits to ensure that the slide has two oil injection channels from top to bottom and from bottom to top, fully ensuring that the upper and lower semi-cylindrical surfaces of the slide are fully lubricated, and the external interfaces of the two lubricating oil circuits are arranged on the same side of the crankcase, which is convenient for pipeline layout.

[0048] In view of the problem of low lubrication efficiency of the friction pair between the crosshead and the box slide at the power end of the existing emulsion pump, the present invention proposes a "bottom-up" forced lubrication structure that overcomes the crosshead's own gravity, combines "top-down" forced lubrication and splash lubrication, so that the friction pair formed by the crosshead and the box slide can fully establish a lubricating oil film, achieve the effect of "floating" reciprocating motion of the crosshead in the box slide, solve the "cylinder pulling" failure of the crosshead and the box slide, and increase the service life of the product.

[0049] Example 2

[0050] like Figure 1-Figure 2 As shown, this embodiment provides a plunger pump, including a crankcase;

[0051] The crankcase includes a lower case 2;

[0052] The lower box body 2 is provided with a slideway, a first lubricating oil circuit is provided above the slideway, and the first lubricating oil circuit is connected to the inside of the slideway; a second lubricating oil circuit is provided below the slideway, and the second lubricating oil circuit is connected to the inside of the slideway.

[0053] The oil is injected into the first lubricating oil circuit and the second lubricating oil circuit by an external power source, and then enters the slideway, and the upper and lower cylindrical surfaces of the slideway are respectively injected with oil to establish an effective oil film between the slider and the cylinder sleeve, which is fully lubricated to prevent friction and wear.

[0054] The present invention forces a plunger pump to be provided with a lubricating oil passage from bottom to top leading to the slideway, and the oil can be injected into the slideway without relying on gravity, so as to establish a stable oil film on the lower semi-cylindrical surface of the slideway, provide effective lubrication, and prevent friction and wear of the slider;

[0055] The present invention arranges two lubricating oil circuits to ensure that the slide has two oil injection channels from top to bottom and from bottom to top, fully ensuring that the upper and lower semi-cylindrical surfaces of the slide are fully lubricated, and the external interfaces of the two lubricating oil circuits are arranged on the same side of the crankcase, which is convenient for pipeline layout.

[0056] In view of the problem of low lubrication efficiency of the friction pair between the crosshead and the box slide at the power end of the existing emulsion pump, the present invention proposes a "bottom-up" forced lubrication structure that overcomes the crosshead's own gravity, combines "top-down" forced lubrication and splash lubrication, so that the friction pair formed by the crosshead and the box slide can fully establish a lubricating oil film, achieve the effect of "floating" reciprocating motion of the crosshead in the box slide, solve the "cylinder pulling" failure of the crosshead and the box slide, and increase the service life of the product.

[0057] Compared with the first embodiment, the present embodiment is different in that:

[0058] The first lubricating oil circuit includes a first lubricating main circuit 4 and a plurality of first lubricating branch circuits 5, one end of the first lubricating main circuit 4 is connected to the lower box body 2; the first lubricating main circuit 4 is respectively connected to each of the first lubricating branch circuits 5, and one end of each of the first lubricating branch circuits 5 is connected to the slideway.

[0059] The second lubricating oil circuit includes a second lubricating main circuit 9 and a plurality of second lubricating branch circuits 10, one end of the second lubricating main circuit 9 is connected to the lower box body 2; the second lubricating main circuit 9 is respectively connected to each of the second lubricating branch circuits 10, and one end of each of the second lubricating branch circuits 10 is connected to the slideway.

[0060] The oil is injected into the first lubrication main circuit 4 and the second lubrication main circuit 10 by an external power source, passes through the first lubrication branch circuit 5 and the second lubrication branch circuit 9 respectively, and then enters the slideway, and the oil is injected into the upper and lower cylindrical surfaces of the slideway respectively, so as to establish an effective oil film between the slider and the cylinder liner in the slideway, fully lubricate, and prevent friction and wear.

[0061] Example 3

[0062] like Figure 1-Figure 2 As shown, this embodiment provides a plunger pump, including a crankcase;

[0063] The crankcase includes a lower case 2;

[0064] The lower box body 2 is provided with a slideway, a first lubricating oil circuit is provided above the slideway, and the first lubricating oil circuit is connected to the inside of the slideway; a second lubricating oil circuit is provided below the slideway, and the second lubricating oil circuit is connected to the inside of the slideway.

[0065] The oil is injected into the first lubricating oil circuit and the second lubricating oil circuit by an external power source, and then enters the slideway, and the upper and lower cylindrical surfaces of the slideway are respectively injected with oil to establish an effective oil film between the slider and the cylinder sleeve, which is fully lubricated to prevent friction and wear.

[0066] The present invention forces a plunger pump to be provided with a lubricating oil passage from bottom to top leading to the slideway, and the oil can be injected into the slideway without relying on gravity, so as to establish a stable oil film on the lower semi-cylindrical surface of the slideway, provide effective lubrication, and prevent friction and wear of the slider;

[0067] The present invention arranges two lubricating oil circuits to ensure that the slide has two oil injection channels from top to bottom and from bottom to top, fully ensuring that the upper and lower semi-cylindrical surfaces of the slide are fully lubricated, and the external interfaces of the two lubricating oil circuits are arranged on the same side of the crankcase, which is convenient for pipeline layout.

[0068] In view of the problem of low lubrication efficiency of the friction pair between the crosshead and the box slide at the power end of the existing emulsion pump, the present invention proposes a "bottom-up" forced lubrication structure that overcomes the crosshead's own gravity, combines "top-down" forced lubrication and splash lubrication, so that the friction pair formed by the crosshead and the box slide can fully establish a lubricating oil film, achieve the effect of "floating" reciprocating motion of the crosshead in the box slide, solve the "cylinder pulling" failure of the crosshead and the box slide, and increase the service life of the product.

[0069] The first lubricating oil circuit includes a first lubricating main circuit 4 and a plurality of first lubricating branch circuits 5, one end of the first lubricating main circuit 4 is connected to the lower box body 2; the first lubricating main circuit 4 is respectively connected to each of the first lubricating branch circuits 5, and one end of each of the first lubricating branch circuits 5 is connected to the slideway.

[0070] The second lubricating oil circuit includes a second lubricating main circuit 9 and a plurality of second lubricating branch circuits 10, one end of the second lubricating main circuit 9 is connected to the lower box body 2; the second lubricating main circuit 9 is respectively connected to each of the second lubricating branch circuits 10, and one end of each of the second lubricating branch circuits 10 is connected to the slideway.

[0071] The oil is injected into the first lubrication main circuit 4 and the second lubrication main circuit 10 by an external power source, passes through the first lubrication branch circuit 5 and the second lubrication branch circuit 9 respectively, and then enters the slideway, and the oil is injected into the upper and lower cylindrical surfaces of the slideway respectively, so as to establish an effective oil film between the slider and the cylinder liner in the slideway, fully lubricate, and prevent friction and wear.

[0072] The difference between this embodiment and the second embodiment is that:

[0073] The first lubrication main circuit 4 and the second lubrication main circuit 10 are arranged horizontally, which is convenient for the arrangement of the pipelines;

[0074] The first lubrication branch 5 is arranged perpendicular to the first lubrication main path 4. Such a design can shorten the distance that the oil flows;

[0075] The second lubrication branch 9 is perpendicular to the second lubrication main path 10. Such a design can shorten the distance that the oil flows.

[0076] The first lubricating branch 5 is inclined downward toward the slideway; the second lubricating branch 9 is inclined upward toward the slideway.

[0077] The lower box body 2 is provided with a first external interface connected to the first lubrication main circuit 4, and the lower box body is provided with a second external interface connected to the second lubrication main circuit 10. The first external interface and the second external interface are arranged on the same side of the lower box body to facilitate pipeline arrangement.

[0078] Example 4

[0079] like Figure 1-Figure 2 As shown, this embodiment provides a plunger pump, including a crankcase;

[0080] The crankcase includes a lower case 2;

[0081] The lower box body 2 is provided with a slideway, a first lubricating oil circuit is provided above the slideway, and the first lubricating oil circuit is connected to the inside of the slideway; a second lubricating oil circuit is provided below the slideway, and the second lubricating oil circuit is connected to the inside of the slideway.

[0082] The oil is injected into the first lubricating oil circuit and the second lubricating oil circuit by an external power source, and then enters the slideway, and the upper and lower cylindrical surfaces of the slideway are respectively injected with oil to establish an effective oil film between the slider and the cylinder sleeve, which is fully lubricated to prevent friction and wear.

[0083] The present invention forces a plunger pump to be provided with a lubricating oil passage from bottom to top leading to the slideway, and the oil can be injected into the slideway without relying on gravity, so as to establish a stable oil film on the lower semi-cylindrical surface of the slideway, provide effective lubrication, and prevent friction and wear of the slider;

[0084] The present invention arranges two lubricating oil circuits to ensure that the slide has two oil injection channels from top to bottom and from bottom to top, fully ensuring that the upper and lower semi-cylindrical surfaces of the slide are fully lubricated, and the external interfaces of the two lubricating oil circuits are arranged on the same side of the crankcase, which is convenient for pipeline layout.

[0085] In view of the problem of low lubrication efficiency of the friction pair between the crosshead and the box slide at the power end of the existing emulsion pump, the present invention proposes a "bottom-up" forced lubrication structure that overcomes the crosshead's own gravity, combines "top-down" forced lubrication and splash lubrication, so that the friction pair formed by the crosshead and the box slide can fully establish a lubricating oil film, achieve the effect of "floating" reciprocating motion of the crosshead in the box slide, solve the "cylinder pulling" failure of the crosshead and the box slide, and increase the service life of the product.

[0086] The first lubricating oil circuit includes a first lubricating main circuit 4 and a plurality of first lubricating branch circuits 5, one end of the first lubricating main circuit 4 is connected to the lower box body 2; the first lubricating main circuit 4 is respectively connected to each of the first lubricating branch circuits 5, and one end of each of the first lubricating branch circuits 5 is connected to the slideway.

[0087] The second lubricating oil circuit includes a second lubricating main circuit 9 and a plurality of second lubricating branch circuits 10, one end of the second lubricating main circuit 9 is connected to the lower box body 2; the second lubricating main circuit 9 is respectively connected to each of the second lubricating branch circuits 10, and one end of each of the second lubricating branch circuits 10 is connected to the slideway.

[0088] The oil is injected into the first lubrication main circuit 4 and the second lubrication main circuit 10 by an external power source, passes through the first lubrication branch circuit 5 and the second lubrication branch circuit 9 respectively, and then enters the slideway, and the oil is injected into the upper and lower cylindrical surfaces of the slideway respectively, so as to establish an effective oil film between the slider and the cylinder liner in the slideway, fully lubricate, and prevent friction and wear.

[0089] The first lubrication main circuit 4 and the second lubrication main circuit 10 are arranged horizontally, which is convenient for the arrangement of the pipelines;

[0090] The first lubrication branch 5 is arranged perpendicular to the first lubrication main path 4. Such a design can shorten the distance that the oil flows;

[0091] The second lubrication branch 9 is perpendicular to the second lubrication main path 10. Such a design can shorten the distance that the oil flows.

[0092] The first lubricating branch 5 is inclined downward toward the slideway; the second lubricating branch 9 is inclined upward toward the slideway.

[0093] The lower box body 2 is provided with a first external interface connected to the first lubrication main circuit 4, and the lower box body is provided with a second external interface connected to the second lubrication main circuit 10. The first external interface and the second external interface are arranged on the same side of the lower box body to facilitate pipeline arrangement.

[0094] Compared with the third embodiment, the present embodiment is different in that:

[0095] The crankcase further comprises an upper case 1 arranged on the lower case 2;

[0096] The first lubrication branch and the second lubrication branch are symmetrical with respect to the slideway, which is beneficial to maintaining the consistency of the oil inflow to the upper and lower cylindrical surfaces inside the slideway.

[0097] Example 5

[0098] like Figure 1-Figure 2As shown, this embodiment provides a plunger pump, including a crankcase;

[0099] The crankcase includes a lower case 2;

[0100] The lower box body 2 is provided with a slideway, a first lubricating oil circuit is provided above the slideway, and the first lubricating oil circuit is connected to the inside of the slideway; a second lubricating oil circuit is provided below the slideway, and the second lubricating oil circuit is connected to the inside of the slideway.

[0101] The oil is injected into the first lubricating oil circuit and the second lubricating oil circuit by an external power source, and then enters the slideway, and the upper and lower cylindrical surfaces of the slideway are respectively injected with oil to establish an effective oil film between the slider and the cylinder sleeve, which is fully lubricated to prevent friction and wear.

[0102] The present invention forces a plunger pump to be provided with a lubricating oil passage from bottom to top leading to the slideway, and the oil can be injected into the slideway without relying on gravity, so as to establish a stable oil film on the lower semi-cylindrical surface of the slideway, provide effective lubrication, and prevent friction and wear of the slider;

[0103] The present invention arranges two lubricating oil circuits to ensure that the slide has two oil injection channels from top to bottom and from bottom to top, fully ensuring that the upper and lower semi-cylindrical surfaces of the slide are fully lubricated, and the external interfaces of the two lubricating oil circuits are arranged on the same side of the crankcase, which is convenient for pipeline layout.

[0104] In view of the problem of low lubrication efficiency of the friction pair between the crosshead and the box slide at the power end of the existing emulsion pump, the present invention proposes a "bottom-up" forced lubrication structure that overcomes the crosshead's own gravity, combines "top-down" forced lubrication and splash lubrication, so that the friction pair formed by the crosshead and the box slide can fully establish a lubricating oil film, achieve the effect of "floating" reciprocating motion of the crosshead in the box slide, solve the "cylinder pulling" failure of the crosshead and the box slide, and increase the service life of the product.

[0105] The first lubricating oil circuit includes a first lubricating main circuit 4 and a plurality of first lubricating branch circuits 5, one end of the first lubricating main circuit 4 is connected to the lower box body 2; the first lubricating main circuit 4 is respectively connected to each of the first lubricating branch circuits 5, and one end of each of the first lubricating branch circuits 5 is connected to the slideway.

[0106] The second lubricating oil circuit includes a second lubricating main circuit 9 and a plurality of second lubricating branch circuits 10, one end of the second lubricating main circuit 9 is connected to the lower box body 2; the second lubricating main circuit 9 is respectively connected to each of the second lubricating branch circuits 10, and one end of each of the second lubricating branch circuits 10 is connected to the slideway.

[0107] The oil is injected into the first lubrication main circuit 4 and the second lubrication main circuit 10 by an external power source, passes through the first lubrication branch circuit 5 and the second lubrication branch circuit 9 respectively, and then enters the slideway, and the oil is injected into the upper and lower cylindrical surfaces of the slideway respectively, so as to establish an effective oil film between the slider and the cylinder liner in the slideway, fully lubricate, and prevent friction and wear.

[0108] The first lubrication main circuit 4 and the second lubrication main circuit 10 are arranged horizontally, which is convenient for the arrangement of the pipelines;

[0109] The first lubrication branch 5 is arranged perpendicular to the first lubrication main path 4. Such a design can shorten the distance that the oil flows;

[0110] The second lubrication branch 9 is perpendicular to the second lubrication main path 10. Such a design can shorten the distance that the oil flows.

[0111] The first lubricating branch 5 is inclined downward toward the slideway; the second lubricating branch 9 is inclined upward toward the slideway.

[0112] The lower box body 2 is provided with a first external interface connected to the first lubrication main circuit 4, and the lower box body is provided with a second external interface connected to the second lubrication main circuit 10. The first external interface and the second external interface are arranged on the same side of the lower box body to facilitate pipeline arrangement.

[0113] The crankcase further comprises an upper case 1 arranged on the lower case 2;

[0114] The first lubrication branch and the second lubrication branch are symmetrical with respect to the slideway, which is beneficial to maintaining the consistency of the oil inflow to the upper and lower cylindrical surfaces inside the slideway.

[0115] The present embodiment is different from the fourth embodiment in that:

[0116] The other end of each of the first lubrication branches 5 is connected to the lower box body 2 , and a first screw plug 3 is installed at the orifice at the other end of the first lubrication branch 5 .

[0117] The other end of each of the second lubrication branches 9 is connected to the lower box body 2 , and a second screw plug 11 is installed at the orifice at the other end of the second lubrication branch.

[0118] The lower box 2 is provided with a cylinder sleeve 6 inside, and the cylinder sleeve 6 is arranged on the outer periphery of the slideway;

[0119] The cylinder sleeve 6 is provided with a first oil passage 7 communicating with the interior of the slideway, and the first oil passage 7 is connected to the first lubrication branch 5 .

[0120] The cylinder sleeve 6 is provided with a second oil passage 8 communicating with the slideway, and the second oil passage 8 is connected to a second lubrication branch 9 .

Claims

1. A plunger pump, characterized in that: Including crankcase; The crankcase includes a lower case; The lower box body is provided with a slideway, and a first lubricating oil path communicating with the interior of the slideway is provided above the slideway; and a second lubricating oil path communicating with the interior of the slideway is provided below the slideway.

2. The plunger pump according to claim 1, characterized in that: The first lubricating oil circuit includes a first lubricating main circuit and a plurality of first lubricating branch circuits, one end of the first lubricating main circuit is connected to the lower box body; the first lubricating main circuit is respectively connected to each of the first lubricating branch circuits, and one end of each of the first lubricating branch circuits is connected to the slideway.

3. The plunger pump according to claim 2, characterized in that: The second lubricating oil circuit includes a second lubricating main circuit and a plurality of second lubricating branch circuits, one end of the second lubricating main circuit is connected to the lower box body; the second lubricating main circuit is respectively connected to each of the second lubricating branch circuits, and one end of each of the second lubricating branch circuits is connected to the slideway.

4. The plunger pump according to claim 3, characterized in that: The first lubrication main path and the second lubrication main path are arranged horizontally; the first lubrication branch path is inclined downward toward the slideway; and the second lubrication branch path is inclined upward toward the slideway.

5. The plunger pump according to claim 4, characterized in that: The lower box body is provided with a first external interface connected to the first lubrication main circuit, and the lower box body is provided with a second external interface connected to the second lubrication main circuit. The first external interface and the second external interface are arranged on the same side of the lower box body.

6. The plunger pump according to claim 3, characterized in that: The first lubrication branch and the second lubrication branch are vertically symmetrical relative to the slideway.

7. The plunger pump according to claim 2, characterized in that: The other end of each of the first lubrication branches is connected to the lower box body respectively, and a first screw plug is provided at the orifice at the other end of the first lubrication branch.

8. The plunger pump according to claim 3, characterized in that: The other end of each of the second lubrication branches is connected to the lower box body respectively, and a second screw plug is provided at the orifice at the other end of the second lubrication branch.

9. The plunger pump according to claim 3, characterized in that: A cylinder sleeve is arranged inside the lower box body, and the cylinder sleeve is arranged on the outer periphery of the slideway; The cylinder sleeve is provided with a first oil passage communicating with the interior of the slideway, and the first oil passage is connected to the first lubrication branch.

10. The plunger pump according to claim 9, characterized in that The cylinder sleeve is provided with a second oil passage communicating with the slideway, and the second oil passage is connected with the second lubrication branch.

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