CN216199388U

CN216199388U - Manual oil pump assembly with self-contained exhaust function

Info

Publication number: CN216199388U
Application number: CN202122795663.5U
Authority: CN
Inventors: 姜小明
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2022-04-05
Anticipated expiration: 2031-11-16

Abstract

The utility model discloses a manual oil pump assembly with an exhaust function, which mainly comprises a pump body, a reversing valve, a one-way valve, an overflow valve and a scavenging plug, wherein the reversing valve mainly comprises a valve body, a steel ball, a return spring and a plug, an oil delivery cavity is arranged in the output end of the valve body, and a first oil delivery hole and a second oil delivery hole are axially distributed on the outer circumferential surface of the output end of the valve body at intervals; the outer circumferential surface of the output end of the valve body is provided with a third oil conveying hole, the third oil conveying hole and the first oil conveying hole are arranged in a circumferential distribution mode, the third oil conveying hole and the two second oil conveying holes are arranged in a staggered mode, a four-way input flow passage is arranged in the input end of the valve body, three radial flow passages of the four-way input flow passage are arranged in a circumferential distribution mode, and an axial flow passage of the four-way input flow passage is communicated with the oil conveying cavity; compared with the existing reversing valve, the reversing valve has the advantages that the oil conveying hole is added, the three-way type input flow channel is changed into the four-way type input flow channel, and air stored in the rod cavity of the hydraulic cylinder is discharged along with flowing hydraulic oil.

Description

Manual oil pump assembly with self-contained exhaust function

Technical Field

The utility model belongs to the field of hydraulic distribution valves, and particularly relates to an oil pump reversing valve with an exhaust function.

Background

At present, the hydraulic turnover system of the cab of the commercial vehicle is greatly applied to domestic and foreign medium and heavy-duty trucks along with the improvement of the platformization and the comfort of the cab of the whole vehicle, the application of the hydraulic turnover system of the cab of the commercial vehicle tends to be mature, and products are accepted by vast users. When parts such as an engine and the bottom of a cab need to be maintained and repaired, the cab of the whole vehicle is required to be turned forwards for maintenance. The hydraulic turnover system can not solve a very important problem in the process of assembling the whole vehicle and replacing spare parts, namely, the system exhausts.

Taking model DFH4251AX4AV of Dongfeng commercial vehicle as an example: when the hydraulic turnover system of the cab of the whole vehicle is installed, no hydraulic oil exists in the main lifting oil cylinder, the auxiliary lifting oil cylinder and the high-pressure oil pipe; the total length of the used high-pressure oil pipe reaches 9.6 meters, and the inner diameter of the oil pipe is phi 4 millimeters. The total air volume of the hydraulic turnover system of the cab is 283.94ml due to the fact that 120.58ml is obtained only by the internal volume of the high-pressure oil pipe and 163.36ml is obtained by the internal air volume of the main lifting oil cylinder and the auxiliary lifting oil cylinder when the main lifting oil cylinder and the auxiliary lifting oil cylinder are delivered from a factory. When the cab hydraulic overturning system works: the oil pump is used for conveying oil to the main lifting oil cylinder and the auxiliary lifting oil cylinder, 120.58ml of air in the high-pressure oil pipe is instantaneously pushed into the oil cylinders and moves in the system in the form of bubbles, and the phenomenon is cavitation in hydraulic pressure.

When cavitation occurs, the flow characteristics of the hydraulic oil deteriorate, resulting in unstable flow and pressure; once the bubbles enter a high-pressure area of the system, the bubbles are forced to be rapidly broken by the high pressure, and high temperature and hydraulic impact pressure are locally generated, so that the fault phenomena of system vibration, crawling of a hydraulic oil cylinder, noise rise of an electric oil pump and the like are caused.

When bubbles attached to the surface of an object are subjected to pressure air fall, the surface of the object is fatigued by high temperature and high pressure generated locally, the deformation of a sealing element is aggravated, the surface of the object is corroded and peeled off, even a spongy small cave is formed, the cavitation phenomenon in a hydraulic system is caused, and the service life of parts can be greatly shortened due to the cavitation effect.

When the pressure of the system is reduced, the gas dissolved in the hydraulic oil can be dissociated and moves upwards through the floating area of the hydraulic oil cylinder until the gas is accumulated at the lower end of the front cover of the hydraulic oil cylinder. When the whole vehicle runs on a bumpy road, the influence of cab vibration and resonance of the whole vehicle is easily caused; the piston rod moves in the front cover in a reciprocating mode at a high speed, dry friction occurs under the condition that hydraulic oil lubrication and cooling are unavailable, high temperature generated by the dry friction can lead a system sealing piece to be fatigued prematurely and generate thermal deformation, meanwhile, the dry friction also accelerates the abrasion of all parts, so that the sealing performance is reduced and the sealing performance is invalid, oil leakage of the oil cylinder finally occurs, product quality faults are generated, the oil cylinder must be replaced in a 4S shop, customers complain about the oil cylinder, and huge economic losses are caused.

When the hydraulic turnover system is affected by the rise of ambient temperature (such as the rise of the temperature in summer and the rise of the temperature in southern areas), air in the system expands at the highest speed and pushes hydraulic oil in the hydraulic oil cylinder to move towards the oil pump, when the returned oil quantity exceeds the volume of the oil tank, the hydraulic oil overflows from the ventilation plug, the overflow of the hydraulic oil directly pollutes the turnover oil pump system and the appearance of the whole vehicle, the environmental pollution is caused, the oil shortage of the hydraulic turnover system can also be caused, and the hydraulic turnover system in a cab can not work normally.

Taking the whole vehicle sales value of a certain company as an example, 10 months are spent in 8 months to 2012 months in 2011, and after-sales services of 4S stores are totally returned to 3306 pieces, and through piece-by-piece simulation test, disassembly and analysis, 2466 pieces with normal use functions are recovered through cleaning, oil change and the like, and account for 74.6 percent of total returned pieces. The three-pack claim fee for this reason: about 133 ten thousand yuan.

Therefore, in order to solve the problem of air entering in a hydraulic turnover system of a cab installed on a whole vehicle, all host factories adopt vacuum filling working media when assembling a hydraulic oil pump and a hydraulic oil cylinder, and vacuum filling equipment is large in size, complex in operation and high in cost, and once a certain link is in a problem, vacuum filling only can play a role of quantitative filling at best. If the system is adopted for exhausting in a reciprocating mode, the operation is complex, time and labor are consumed, and the beat of whole vehicle assembly cannot be met. This problem has plagued various host plants and product manufacturers. Host plants at home and abroad have not given up solving the research puzzling them for a long time, and various schemes are not ideal, so that the exhaust target cannot be completely realized.

As shown in fig. 1, the conventional oil pump has a structure in which: the reversing valve mainly comprises a pump body 1, a reversing valve 2, a one-way valve 3, an overflow valve 4 and a scavenging air plug 5, wherein a reversing valve installation cavity, a one-way valve installation cavity and an overflow valve installation cavity are arranged in the pump body, the reversing valve cavity is divided into a hydraulic oil input cavity and a hydraulic oil return cavity, a return hole 11 is formed in the cavity wall of the hydraulic oil return cavity, the one-way valve cavity and the overflow valve cavity are communicated with the hydraulic oil input cavity, the reversing valve can rotate in the reversing valve cavity through a sealing assembly 6, the reversing valve is used for controlling the flow direction of the hydraulic oil, the one-way valve cavity is fixed in the one-way valve installation cavity, the one-way valve core is used for inputting the hydraulic oil in a one-way mode, and the overflow valve and the scavenging air plug are sequentially fixed in the overflow valve installation cavity from inside to outside;

as shown in fig. 2, 3 and 4, the structure of the direction valve 2 is as follows: the hydraulic differential hydraulic cylinder comprises a valve body 21, a steel ball 22, a return spring 23 and a plug 24, wherein a three-way type input flow passage 25 is arranged in an input end of the valve body, two radial flow passages of the input flow passage can be simultaneously communicated with a one-way valve installation cavity and an overflow valve installation cavity, an oil delivery cavity is arranged in an output end of the valve body, an axial flow passage of the input flow passage is communicated with the oil delivery cavity, the steel ball, the return spring and the plug are limited in the oil delivery cavity, the steel ball blocks the axial flow passage through the acting force of the return spring, the outer circumferential surface of the output end of the valve body is in clearance fit with the cavity surface of a hydraulic oil return cavity, first oil delivery holes 26 and second oil delivery holes 27 are axially distributed at intervals on the outer circumferential surface of the output end of the valve body, sealing rings 28 are arranged in the first oil delivery holes and the second oil delivery holes, the first oil delivery holes can be communicated with a first pipe joint 7 on the pump body, the first oil delivery holes are used for delivering oil into a rodless pipe joint cavity of the differential hydraulic cylinder, and the symmetrically arranged second oil delivery holes can be communicated with a second pipe joint 8 on the pump body, the second pipe joint is used for conveying oil liquid to a rod cavity of the differential hydraulic cylinder.

The working principle of the reversing valve is as follows: 1) as shown in fig. 2, the reversing valve is rotated, wherein one radial flow passage is communicated with the check valve, the other radial flow passage is communicated with the overflow valve, the first oil transmission hole is communicated with the first pipe joint, one second oil transmission hole is communicated with the second pipe joint, hydraulic oil flows into the valve body through the check valve, the steel ball is pushed by the oil pressure, one path of the hydraulic oil entering the oil transmission cavity enters the rodless cavity of the differential hydraulic oil cylinder through the first oil transmission hole and the first pipe joint, and the other path of the hydraulic oil enters the rod cavity of the differential hydraulic oil cylinder through the second oil transmission hole and the second pipe joint, so that the differential lifting of the hydraulic oil cylinder is realized; 2) as shown in fig. 6, the reversing valve is rotated, one of the radial flow passages is communicated with the check valve, the other radial flow passage is communicated with the overflow valve, the first oil transmission hole is disconnected with the first pipe joint, the other second oil transmission hole is communicated with the second pipe joint, hydraulic oil flows into the valve body through the check valve, the steel ball is pushed by the oil pressure, the hydraulic oil entering the oil transmission cavity enters the rod cavity of the differential hydraulic oil cylinder through the second oil transmission hole and the second pipe joint, and the return of the piston rod is realized; in the return process, because the outer circumferential surface of the output end of the reversing valve is in clearance fit with the cavity surface of the hydraulic oil return cavity, the hydraulic oil in the rodless cavity flows back to the hydraulic oil return cavity through the first pipe joint and then flows back to the oil storage tank through the return hole.

Disclosure of Invention

The utility model provides a manual oil pump assembly with an exhaust function, and aims to solve the problems of cavitation and cavitation in a hydraulic overturning system of a cab.

In order to solve the technical problems, the technical scheme of the utility model is as follows: a manual oil pump assembly with self-contained exhaust function mainly comprises a pump body, a reversing valve, a one-way valve, an overflow valve and a scavenging plug, wherein the reversing valve, the one-way valve, the overflow valve and the scavenging plug are arranged in respective matched cavities on the pump body; the reversing valve mainly comprises a valve body, a steel ball, a return spring and a plug, wherein an oil conveying cavity is arranged in the output end of the valve body, the steel ball, the return spring and the plug are limited in the oil conveying cavity, first oil conveying holes and second oil conveying holes are axially distributed on the outer circumferential surface of the output end of the valve body at intervals, and sealing rings are arranged in the first oil conveying holes and the second oil conveying holes; the method is characterized in that: the valve body is characterized in that a third oil delivery hole is formed in the outer circumferential surface of the output end of the valve body, the third oil delivery hole and the first oil delivery hole are arranged in a circumferential distribution mode, the third oil delivery hole and two second oil delivery holes which are symmetrically arranged are arranged in a staggered mode, a sealing ring is arranged in the third oil delivery hole, a four-way input flow passage is arranged in the input end of the valve body, three radial flow passages of the four-way input flow passage are arranged in a circumferential distribution mode, an axial flow passage of the four-way input flow passage is communicated with an oil delivery cavity, and the valve core blocks the axial flow passage through the acting force of a return spring.

Has the advantages that: compared with the existing reversing valve, the reversing valve has the advantages that the oil conveying hole is added, the three-way type input flow channel is changed into the four-way type input flow channel, and air stored in the rod cavity of the hydraulic cylinder is discharged along with flowing hydraulic oil; the utility model has smart structure, improves the product quality, prolongs the service life and does not need to use an exhaust aid.

Drawings

Fig. 1 is an overall structure view of a conventional oil pump in the background art.

Fig. 2 is a block diagram of the reversing valve of fig. 1.

Fig. 3 is a view showing the structure of the valve body in fig. 2.

Fig. 4 is a schematic view of direction a-a in fig. 3.

Fig. 5 is a schematic view of direction B-B in fig. 3.

Fig. 6 is a schematic diagram of a piston rod return state in the background art.

Fig. 7 is a structural view of the valve body of the present invention.

Fig. 8 is a schematic view along direction C-C in fig. 7.

Fig. 9 is a schematic view from direction D-D in fig. 7.

FIG. 10 is a schematic view of the venting condition of the present invention.

Detailed Description

As shown in fig. 7, 8 and 9, a manual oil pump assembly with self-contained exhaust function mainly comprises a pump body 1, a reversing valve 2, a one-way valve 3, an overflow valve 4 and a scavenging plug 5, wherein the reversing valve, the one-way valve, the overflow valve and the scavenging plug are arranged in respective matched cavities on the pump body; the reversing valve is characterized in that a reversing valve mounting cavity, a one-way valve mounting cavity and an overflow valve mounting cavity are arranged in the pump body, the reversing valve cavity is divided into a hydraulic oil input cavity and a hydraulic oil return cavity, a return hole 11 is formed in the cavity wall of the hydraulic oil return cavity, the one-way valve cavity and the overflow valve cavity are communicated with the hydraulic oil input cavity, the reversing valve can rotate in the reversing valve cavity through a sealing assembly 6, the reversing valve is used for controlling the flow direction of hydraulic oil, the one-way valve cavity is fixed in the one-way valve mounting cavity, the one-way valve core is used for inputting hydraulic oil in a one-way mode, and the overflow valve and a scavenging plug are sequentially fixed in the overflow valve mounting cavity from inside to outside; the reversing valve mainly comprises a valve body 21, a steel ball 22, a return spring 23 and a plug 24, an oil conveying cavity is arranged in the output end of the valve body, the steel ball, the return spring and the plug are limited in the oil conveying cavity, first oil conveying holes 26 and second oil conveying holes 27 are axially distributed on the outer circumferential surface of the output end of the valve body at intervals, and sealing rings are arranged in the first oil conveying holes and the second oil conveying holes; the valve comprises a valve body and is characterized in that a third oil delivery hole 29 is formed in the outer circumferential surface of the output end of the valve body, the third oil delivery hole and the first oil delivery hole are arranged in a circumferential distribution mode, the third oil delivery hole and two second oil delivery holes which are symmetrically arranged are arranged in a staggered mode, a sealing ring 28 is arranged in the third oil delivery hole, a four-way input flow passage 30 is arranged in the input end of the valve body, three radial flow passages of the four-way input flow passage are arranged in a circumferential distribution mode, an axial flow passage of the four-way input flow passage is communicated with an oil delivery cavity, and a valve core blocks the axial flow passage through the acting force of a return spring.

The working principle of the utility model is as follows: 1) as shown in fig. 2 and 6, the first and second radial flow passages of the four-way input flow passage are matched with the first oil delivery hole and the two second oil delivery holes to realize differential lifting of the hydraulic cylinder or return of the piston rod, and the working principle of the four-way input flow passage is consistent with the description in the background art; 2) as shown in fig. 10, the reversing valve is rotated, the third radial flow passage is communicated with the check valve, the first or second radial flow passage is communicated with the overflow valve, the third oil delivery hole is communicated with the first pipe joint, the two second oil delivery holes are disconnected with the second pipe joint, hydraulic oil flows into the valve body through the check valve, the steel ball is pushed by the oil pressure, the hydraulic oil entering the oil delivery cavity enters the rodless cavity of the hydraulic oil cylinder through the third oil delivery hole and the first pipe joint, the hydraulic oil rises to the rod cavity through the flow guide groove of the floating area (inner wall of the cylinder barrel) along with the rising of the hydraulic oil level, and the air is pushed by the hydraulic oil to be discharged back to the oil storage tank of the oil pump through the connected oil passages (the second pipe joint and the return hole) along with the rising of the hydraulic oil level; the oil storage tank is gradually increased along with the returned air pressure, and the air exchange plug is opened to discharge, so that the exhaust of the cab lifting system is realized. The utility model has smart structure, improves the product quality, prolongs the service life and does not need other exhaust aids.

Claims

1. A manual oil pump assembly with self-contained exhaust function mainly comprises a pump body, a reversing valve, a one-way valve, an overflow valve and a scavenging plug, wherein the reversing valve, the one-way valve, the overflow valve and the scavenging plug are arranged in respective matched cavities on the pump body; the reversing valve mainly comprises a valve body, a steel ball, a return spring and a plug, wherein an oil conveying cavity is arranged in the output end of the valve body, the steel ball, the return spring and the plug are limited in the oil conveying cavity, first oil conveying holes and second oil conveying holes are axially distributed on the outer circumferential surface of the output end of the valve body at intervals, and sealing rings are arranged in the first oil conveying holes and the second oil conveying holes; the method is characterized in that: the outer circumferential surface of the output end of the valve body is provided with a third oil delivery hole, the third oil delivery hole and the first oil delivery hole are arranged in a circumferential distribution mode, the third oil delivery hole and two second oil delivery holes which are symmetrically arranged are arranged in a staggered mode, a sealing ring is arranged in the third oil delivery hole, a four-way input flow passage is arranged in the input end of the valve body, three radial flow passages of the four-way input flow passage are arranged in a circumferential distribution mode, an axial flow passage of the four-way input flow passage is communicated with the oil delivery cavity, and the valve core blocks the axial flow passage through the acting force of a return spring.