CN212643033U - Forced lubrication structure of plunger pump - Google Patents

Abstract

A forced lubrication structure of a plunger pump relates to the field of displacement pumps. The device establishes first passageway that overflows on the rear end cover, establish the second and overflow the passageway on the casing, establish the third and overflow the passageway on the front end cover, first overflow the passageway, the second overflows the passageway and passes through the sealed intercommunication each other of forced lubrication back throttle and third and overflow the passageway, this structure leads in pump outlet water under high pressure through front and back throttle and keeps away from the friction surface of import and fully lubricate, the cavitation has been avoided, the condition such as dry friction fever dish appears.

Description

Forced lubrication structure of plunger pump

Technical Field

The utility model relates to a displacement pump field, in particular to force-feed lubrication structure of plunger pump.

Background

In recent years, a water hydraulic transmission and control technology which directly uses water (filtered natural water, including seawater and fresh water) to replace mineral oil as a working medium has achieved breakthrough progress, and compared with the traditional oil hydraulic transmission, the water hydraulic transmission and control technology has the outstanding advantages of being environment-friendly, clean, efficient, convenient to use and maintain, low in operation cost and the like in wide engineering application. The water hydraulic transmission and control technology has been widely applied to the fields of high-pressure water atomization, seawater desalination, high-pressure water cleaning, stage driving and control, submersible buoyancy adjusting systems, ocean engineering and other transmission and control.

The water hydraulic axial plunger pump has the outstanding advantages of high rotating speed, high pressure, large flow, small flow pulsation, compact volume, light weight and the like, and becomes the most common water hydraulic pump in a water hydraulic transmission and control system. The water hydraulic axial plunger pump products reported on the market at present are all quantitative pumps, such as a series of seawater pumps from danfo corporation, a series of seawater pumps from waters hydralic corporation, uk, an axial plunger pump from Huazhong science and technology university, a pure water pump from Zhejiang university, a fresh water pump from Hubei Kenren science and technology Limited, and a water hydraulic pump from Wuxi Huaxin Kongchu science and technology Limited.

When the suction inlet of an axial plunger pump product using a working medium as a lubricating medium is under a negative pressure working condition, the lubricating medium of a pump cavity can be sucked empty, the air suction cannot be avoided even though the mechanical seal is adopted at the outlet end of a shaft, and after the air enters the cavity, the friction surface can be subjected to cavitation erosion, even dry friction sintering fails suddenly, and the like, so that serious faults are caused. This phenomenon is not so prominent in the case of an oil pressure axial plunger pump because of its excellent oil lubrication performance, but is particularly prominent in a water pump that directly uses water as a lubricating medium. The axial plunger water pump generally requires a positive pressure at the inlet, for example, the danish Danfoss series seawater pump specifically requires an inlet pressure of 5bar, and the water hydraulic pump of the wuxihua kechu science and technology limited requires positive pressure water intake. All satisfy the pump import requirement through setting up import moisturizing pump under the negative pressure operating mode for system application becomes comparatively complicated.

The noise is an expression form of energy loss, the noise directly influences the surrounding working environment, the general noise value of a water hydraulic pump using water as a lubricating medium is 85-90dB (A), the noise is difficult to bear by people working for a long time under the working condition, and the noise also becomes an obstacle directly influencing the development and application of the water hydraulic technology. Meanwhile, if the person is on duty in a pump room of a certain hydraulic drive stage project for a long time, the hearing of the person is reduced, and other occupational diseases even occur.

Disclosure of Invention

The utility model aims at providing a not enough to prior art exists, the utility model aims at providing a force-feed lubrication structure of plunger pump.

The utility model adopts the technical proposal that: a forced lubrication structure of a plunger pump comprises a rear end cover, a flow distribution disc, a cylinder body rotating assembly, a shell, a plunger piston shoe assembly, a return disc, a swash plate, a front end cover and a main shaft, and is technically characterized by further comprising a first overflowing channel arranged on the rear end cover, a second overflowing channel arranged on the shell, a third overflowing channel arranged on the front end cover, a forced lubrication front throttle and a forced lubrication rear throttle, wherein the forced lubrication front throttle is fixedly arranged on the shell, the forced lubrication rear throttle is arranged on the front end cover, the first overflowing channel and the second overflowing channel are communicated with an inner cavity of the cylinder body rotating assembly through the forced lubrication front throttle, and the first overflowing channel and the second overflowing channel are communicated with the third overflowing channel in a sealing manner through the forced lubrication rear throttle; the valve plate is provided with a throttling damping hole, the rear end cover is provided with a cavity with a set volume, and the throttling damping hole is communicated with the cavity.

The utility model has the advantages that: this force-feed lubrication structure of plunger pump, the device establishes first passageway that overflows on the rear end cover, establish the second on the casing and overflow the passageway, establish the third and overflow the passageway on the front end cover, first overflow the passageway, the second overflows the passageway and overflows the passageway through throttle ware and cylinder body rotating assembly inner chamber intercommunication before the force-feed lubrication, first overflow the passageway, the second overflows the passageway and overflows the passageway through throttle ware and third after the force-feed lubrication and seal the intercommunication each other, this structure introduces pump outlet high pressure water and keeps away from the friction surface of import through front and back throttle ware and carries out the intensive lubrication, the cavitation has been avoided, the condition such as dry friction dish appears.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a sectional view of a forced lubrication structure of a plunger pump according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of the throttle orifice in the embodiment of the present invention;

the numbers in the figure illustrate the following: the hydraulic oil cylinder comprises a rear end cover 1, a flow passage 1-1, a flow distribution plate 2, a throttling damping hole 2-1, a cylinder body rotating assembly 3, a flow passage 3-1, a shell 4, a flow passage 4-1, a sliding bearing 5, a plunger piston shoe assembly 6, a return disc 7, a swash plate 8, a mechanical seal 9, a front end cover 10, a flow passage 10-1, a main shaft 11, a guide rod 12, an impact-resistant valve core 13, an impact-resistant valve spring 14, an impact-resistant valve throttling damper 15, a forced lubrication front throttle 16 and a forced lubrication rear throttle 17.

Detailed Description

The above objects, features and advantages of the present invention will become more apparent and the present invention will be explained in more detail with reference to the accompanying drawings 1 and 2.

The forced lubrication structure of the plunger pump adopted in the embodiment comprises a rear end cover 1, a port plate 2, a cylinder body rotating assembly 3, a shell 4, a sliding bearing 5, an odd number of plunger shoe assemblies 6, a return plate 7, a swash plate 8, a mechanical seal 9, a front end cover 10 and a main shaft 11. The rear end cover 1 and the front end cover 10 are respectively and fixedly arranged at two ends of the shell 4, and the valve plate 2 is arranged on the rear end cover 1 and is positioned in the shell 4. One end of a return disc 7 is arranged on a front end cover 10, a swash plate 8 is arranged on the other end of the return disc 7, a cylinder body rotating assembly 3 is movably arranged on the inner wall of a shell 4 through a sliding bearing 5 and is positioned between a port plate 2 and the swash plate 8, a plunger piston shoe assembly 6 is movably arranged in the cylinder body rotating assembly 3, the tail end of a spherical plunger of the plunger piston shoe assembly 6 is movably assembled on the swash plate 8, and a main shaft is movably assembled on the front end cover 10 and is in transmission connection with the cylinder body rotating assembly 3. The plunger of the plunger piston shoe assembly 6 in this embodiment is of a hollow metal structure, and the inside of the plunger piston is filled with nylon or other similar engineering plastics, and is provided with a small overflowing hole inside. The valve plate 2 is provided with a throttling damping hole 2-1, the rear end cover 1 is provided with a cavity A with a set volume, and the throttling damping hole 2-1 is communicated with the cavity A.

The anti-impact valve component also comprises a guide rod 12, an anti-impact valve spool 13, an anti-impact valve spring 14 and an anti-impact valve throttling damper 15, wherein the guide rod 12 is processed by strengthened stainless steel, nickel-copper alloy or titanium alloy, and the anti-impact valve spool 13 is processed by engineering plastic PEEK or engineering plastic PTFE. And a flow passage 3-1 is arranged on the cylinder body rotating assembly 3, and the plunger cavity is communicated with the left cavity of the impact resistant valve through the flow passage 3-1. The right cavity of the shock resistance valve is communicated with the inner cavity of the pump body through a shock resistance valve throttling damper 15.

A guide rod 12 of the anti-impact valve component is fixedly arranged on the cylinder body rotating component 3 through threads, a valve core 13 of the anti-impact valve is sleeved on the guide rod 12 to slide and is abutted against one end of an anti-impact valve spring 14, and the other end of the anti-impact valve spring 14 is abutted against the inner wall of the cylinder body rotating component 3. The shock-resistant valve throttling damper 15 is fixedly mounted on the cylinder block rotating assembly 3 through threads.

The forced lubrication structure mainly comprises a flow passage 1-1 arranged on the rear end cover, a flow passage 4-1 arranged on the shell, a flow passage 10-1 arranged on the front end cover, a forced lubrication front throttle 16 and a forced lubrication rear throttle 17, wherein the forced lubrication front throttle 16 is fixedly arranged on the shell 4 through threads, and the forced lubrication rear throttle 17 is arranged on the front end cover 10 through sleeve tight fit.

The water outlet of the pump is communicated with a cavity near the friction surface of the swash plate 8 through an overflow channel 1-1 on the rear end cover 1, an overflow channel 4-1 on the shell 4, a forced lubrication front throttle 16, a plunger piston shoe assembly 6 in the pump cavity; the water outlet of the pump is communicated with the overflowing flow channel 10-1 arranged on the front end cover 10 through an overflowing channel 1-1 arranged on the rear end cover 1, an overflowing channel 4-1 arranged on the shell 4 and a forced lubrication rear throttle 17.

The number of anti-lash valve assemblies provided on the cylinder block swivel assembly 3 is the same as the number of rams of the ram shoe assembly and is 5, 7 or 9, each ram chamber communicating with a corresponding anti-lash valve assembly.

The working process of the forced lubricating structure of the plunger pump provided by the invention is as follows:

under the initial working state, the main shaft 11 rotates to drive the cylinder body rotating assembly 3 and the plunger piston shoe assembly 6 to rotate, and the plunger piston shoe assembly 6 reciprocates in a cylinder hole of the cylinder body rotating assembly 3 through the interaction with the swash plate 8. And each time the cylinder body rotating assembly 3 rotates for a circle, the plunger reciprocates in the cylinder hole once, and each group of plunger piston shoe assemblies 6 finish the process of water absorption and drainage once through the interaction of the cylinder body rotating assembly 3 and the valve plate 2.

The fluid noise of the plunger pump mainly comes from the backward flow of the high-low pressure switching process, and the plunger cavity is filled with high-pressure water and negative-pressure water with alternative pressure conversion when the pump works normally.

In the process of plunger drainage pressurization, high-pressure water flows to the left cavity of the anti-impact valve component through 3-1, the valve core 13 of the anti-impact valve compresses the spring 14 of the anti-impact valve under the action of the high-pressure water, and water in the right cavity of the anti-impact valve flows to the inner cavity of the pump body through the throttling damper 15 of the anti-impact valve until the highest pressure is reached; in the process of plunger water absorption, negative pressure exists in the plunger cavity, and the valve core 13 of the anti-impact valve pushes water in the left cavity of the anti-impact valve to the plunger cavity under the action of the spring, so that the compensation of the plunger cavity is realized, and the noise is reduced.

In the moving flow distribution process of the pump, the highest point of the swash plate is a high-low pressure switching area, which is a theoretical dead point of flow distribution and is also a pressure highest point in a plunger cavity, in the switching process to the lowest point, the maximum flow backflow area is located at the position, and when the high pressure and the low pressure are switched, a pre-compression cavity A with a set volume is arranged on the rear end cover 1 of the pump, and pre-compression is realized in each plunger cavity.

The plunger cavity is hollow, so that the weight is reduced, the motion inertia is reduced, and the noise is reduced. Meanwhile, in order to reduce the volume of the alternating cavity, the light plastic material made of nylon or the like is arranged in the alternating cavity, so that the operation noise of the pump body is further reduced.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (1)

1. A forced lubrication structure of a plunger pump comprises a rear end cover (1), a flow distribution disc (2), a cylinder body rotating assembly (3), a shell (4), a plunger piston shoe assembly (6), a return disc (7), a swash plate (8), a front end cover (10) and a main shaft (11), and is characterized by further comprising a first overflowing channel (1-1) arranged on the rear end cover (1), a second overflowing channel (4-1) arranged on the shell (4), a third overflowing channel (10-1) arranged on the front end cover (10), a forced lubrication front throttle (16) and a forced lubrication rear throttle (17), wherein the forced lubrication front throttle (16) is fixedly arranged on the shell (4), the forced lubrication rear throttle (17) is arranged on the front end cover (10), the first overflowing channel (1-1) and the second overflowing channel (4-1) are communicated with an inner cavity of the cylinder body rotating assembly (3) through the forced lubrication front throttle (16) The first overflowing channel (1-1) and the second overflowing channel (4-1) are hermetically communicated with the third overflowing channel (10-1) through a forced lubrication rear throttle (17); the flow distribution plate (2) is provided with a throttling damping hole (2-1), the rear end cover (1) is provided with a cavity (A) with a set volume, and the throttling damping hole (2-1) is communicated with the cavity (A).

Images