CN211230738U

CN211230738U - Manual hydraulic pump

Info

Publication number: CN211230738U
Application number: CN201922028087.4U
Authority: CN
Inventors: 粟武洪; 王伟建
Original assignee: Shaoyang Victor Hydraulics Co ltd
Current assignee: Shaoyang Victor Hydraulics Co ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-08-11
Anticipated expiration: 2029-11-22

Abstract

The manual hydraulic pump comprises a front end cover, a handle, a rear end cover and a first plunger cylinder between the two end covers; the first oil suction rod is communicated with the first plunger cylinder; a first one-way valve is arranged between the first oil suction rod and the first plunger cylinder; the second plunger cylinder is connected with the rear end cover; the second piston rod is connected with the second plunger cylinder and the first piston rod; the oil inlet is communicated with the first plunger cylinder, the middle part of the rear end cover is provided with a load unloading rod, the length of the load unloading rod is higher than that of the first oil suction rod and the second oil suction rod and is parallel to the first oil suction rod and the second oil suction rod, and the end parts of the first oil suction rod and the second oil suction rod are provided with filters. The utility model discloses when the high load, first plunger cylinder control air does not get into the seal chamber, can not cause the second plunger cylinder seal chamber to sneak into the air, can not reduce the oil absorption ability of second plunger cylinder. Meanwhile, the first plunger cylinder does not extrude air, and the oil in the whole system does not generate bubbles; the oil tank is small and light, solves the blocking phenomenon of the hydraulic control one-way valve and ensures the normal work of the manual pump.

Description

Manual hydraulic pump

Technical Field

The utility model belongs to the technical field of the hydraulic pressure technique and specifically relates to a manual hydraulic pump.

Background

A manual pump is a pump which uses manual force. The one-way manual oil pump is a small hydraulic pump station for converting manual mechanical energy into hydraulic energy. The manual hydraulic pump has the advantages of simple operation, convenient carrying and large output pressure, and can carry out various operations under the condition of using the matched oil cylinder and the special tool, such as: hoisting, bending, straightening, shearing, riveting, assembling, disassembling, some building construction, military construction and the like, and has wide application. CN201820958554.6 discloses a manual hydraulic pump, which comprises a front end cover; a handle, a first plunger cylinder; a rear end cap; a first piston rod connected to the handle; the first plunger cylinder is communicated with the first plunger rod; the first one-way valve is arranged between the first oil suction rod and the first plunger cylinder; a second plunger cylinder connected with the rear end cover; a second piston rod; a second sucker rod communicated with the second plunger cylinder; a second one-way valve; a third check valve; a fourth check valve; the hydraulic control one-way valve is communicated with the oil inlet and the first plunger cylinder, the control oil port and the manual hydraulic pump outlet, and the oil outlet and the oil return tank. The manual hydraulic pump consists of a large pump and a small pump, the load is very small, the large pump and the small pump work together in the manual hydraulic pump, when the system load reaches a set value, a hydraulic control one-way valve is opened, the large pump is unloaded, and only the small pump works at the moment. Therefore, low-load high-speed and high-load low-speed are realized, and the lowest working torque of the manual hydraulic pump is ensured. The manual hydraulic pump has two problems, namely, the F port for controlling the unloading of the first plunger cylinder cannot be higher than the lowest liquid level of an oil tank (the F port must be below the liquid level), otherwise, the manual hydraulic pump has the problems that the pressure of a system rises slowly, the oil absorption of the second plunger cylinder is difficult, the air intake of the system is difficult, and the like. In order to ensure that the manual hydraulic pump operates normally, the opening F must be ensured to be under the liquid level, so that the height of the oil tank is increased, the invalid oil in the oil tank is increased, and the invalid volume of the oil tank is increased. The height, volume, weight, etc. of the fuel tank may increase. Secondly, when the cleanliness of oil is not enough, the manual pump can not work normally even if the handle is provided with a long force applying rod and is difficult to press down.

SUMMERY OF THE UTILITY MODEL

The utility model solves the technical problems that the pressure of the manual hydraulic pump system rises slowly, the second plunger cylinder absorbs oil difficultly, the system is intake and the like; meanwhile, the problem that the manual hydraulic pump cannot work normally when the oil cleanliness is poor is solved.

The technical scheme of the utility model is that: the manual hydraulic pump comprises a front end cover, a handle, a rear end cover and a first plunger cylinder between the two end covers; a first piston rod; the first plunger cylinder is communicated with the first oil suction rod; the rear end cover is connected with a second plunger cylinder; a second piston rod is arranged in the second plunger cylinder, a second oil suction rod is communicated with the second plunger cylinder, and a second one-way valve is arranged between the second oil suction rod and the second plunger cylinder; the oil inlet is communicated with the first plunger cylinder and the second plunger cylinder, and the oil outlet is communicated with the oil outlet of the manual hydraulic pump; and a load unloading rod is arranged at the F-shaped opening in the middle of the rear end cover, is communicated with the one-way valve and is parallel to the first oil suction rod and the second oil suction rod, and filters are arranged at oil inlets of the first oil suction rod and the second oil suction rod.

The unloading rod is a slender round rod with a through hole inside, the front part of the unloading rod is in threaded connection with the rear end cover, and the end surface of the rear part of the unloading rod is provided with a cross groove; the length of the unloading rod is higher than that of the first oil suction rod and the second oil suction rod.

The technical effects of the utility model are that: guarantee that manual pump when high load, first plunger jar is not inhaled the air and is got into the seal chamber, can not cause second plunger jar seal chamber to sneak into the air, just can not reduce the oil absorption ability of second plunger jar. Meanwhile, the first plunger cylinder does not suck air and can not extrude air, and bubbles can not appear in oil of the whole system. Thus, the level of the tank need not be high, which reduces the dead volume of the tank. Under the condition of ensuring the working performance of the manual pump, the volume of the oil tank can be minimized and lightened. The oil suction port of the manual pump is provided with a filter. The cleanliness of oil of the oil suction hand pump is guaranteed, the blocking phenomenon of the hydraulic control one-way valve is avoided, and the normal work of the hand pump is guaranteed.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this application.

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic sectional view taken along line B-B of FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along line C-C of FIG. 1;

FIG. 5 is a schematic cross-sectional view of a C-C direction of the prior art.

In the figure: 1 front end housing, 2 handles, 3 rear end housing, 4 oil-out, 5 first plunger jar, 6 piston rods, 7 oil absorption poles, 8 check valve 9 second plunger jar, 10 second piston rods, 11 second oil absorption poles, 12 second check valves, 13 liquid accuse check valves, 14 third check valves, 15 fourth check valves, 23 unloading pole, 24 filters, F first plunger jar off-load port.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The manual hydraulic pump as shown in fig. 1 to 4 comprises a front end cover 1, a handle 2 connected with one end of the front end cover 1, a first plunger cylinder 5 connected with the other end of the front end cover 1, a rear end cover 3 connected with the first plunger cylinder 5, a first piston rod 6 with a first end connected with the first plunger cylinder 5 in a sliding way and the other end connected with the handle 2, a first oil suction rod 7 communicated with the first plunger cylinder 5, a first check valve 8 arranged between the first oil suction rod 7 and the first plunger cylinder 5, a second plunger cylinder 9 connected with the rear end cover 3, a second piston rod 10 with a first end connected with the second plunger cylinder 9 in a sliding way and the other end connected with the first piston rod 6, a second oil suction rod 11 communicated with the second plunger cylinder 9, a second check valve 12 arranged between the second oil suction rod 11 and the second plunger cylinder 9, a third check valve 14 with an oil outlet communicated with an oil outlet 4 of the manual hydraulic pump, the hydraulic oil pump comprises a fourth one-way valve 15, an oil outlet of the fourth one-way valve is communicated with an oil outlet 4 of the manual hydraulic pump, a hydraulic control one-way valve 13, a filter 24 and a first plunger cylinder unloading rod 23, wherein the oil inlet of the fourth one-way valve is communicated with the first plunger cylinder 5, the control oil outlet of the fourth one-way valve is communicated with the oil outlet 4 of the manual hydraulic pump, the oil outlet of the fourth one-way valve is communicated with an oil return tank, the filter 24 is connected with a first oil suction rod 7 and a second oil suction rod 11. The unloading rod 23 is a slender round rod with a through hole inside, the front part of the rod is connected with the rear end cover 3 by screw threads, and the end surface of the rear part is provided with a cross groove; the unloading rod 23 is longer than the first oil suction rod 7 and the second oil suction rod 11. The unloading rod is communicated with the one-way valve and is parallel to the first oil suction rod 7 and the second oil suction rod 11, and the filter 24 is arranged at the oil inlets of the first oil suction rod and the second oil suction rod.

The working principle is as follows: the first plunger cylinder 5 and the first piston rod 6 form a flow pump (hereinafter referred to as a large pump), the second plunger cylinder 9 and the second piston rod 10 form a flow pump (hereinafter referred to as a small pump), a hydraulic control one-way valve 13 is arranged between an oil outlet of the large pump and an oil outlet of the small pump, an axial cavity is arranged in the first piston rod 6, and the second piston rod 10 is connected with the axial cavity of the first piston rod 6. When the handle 2 is lifted upwards (in the direction shown in the figure), the first piston rod 6 and the second piston rod 10 are driven to synchronously move upwards, the volumes of the closed cavities of the first plunger cylinder 5 and the second plunger cylinder 9 are increased, the first plunger cylinder 5 absorbs oil through the first check valve 8, the first oil absorption rod 7 and the filter 24, and the second plunger cylinder 9 absorbs oil through the second check valve 12, the second oil absorption rod 11 and the filter 24. When the handle 2 is pressed downwards, the first piston rod 6 and the second piston rod 10 are driven to synchronously move downwards (in the direction shown in the figure), the volumes of the closed cavities of the first plunger cylinder 5 and the second plunger cylinder 9 are reduced, and the first check valve 8 and the second check valve 12 are closed. When the working pressure of the oil outlet 4 is lower than the working pressure of the conduction of the hydraulic control one-way valve 13, the third one-way valve 14 and the fourth one-way valve 15 are opened, the large pump and the small pump simultaneously discharge oil to the oil outlet 4, and quick oil supply is realized. When the working pressure of the oil outlet 4 is higher than the working pressure of the conduction of the hydraulic control one-way valve 13, the hydraulic control one-way valve 13 is opened, the third one-way valve 14 is closed, the large pump discharges oil into the oil return tank through the first plunger cylinder unloading rod 23 and is in an unloading state, the fourth one-way valve 15 is opened, and the small pump discharges oil to the oil outlet 4. At the moment, the manual hydraulic pump outputs small flow, and high-pressure oil supply can be realized under the condition that the manual power of an operator is limited because the large pump is in an unloading state.

Claims

1. The manual hydraulic pump comprises a front end cover (1), a handle (2), a rear end cover (3) and a first plunger cylinder (5) between the two end covers; a first piston rod (6); a first oil suction rod (7) communicated with the first plunger cylinder (5), and a first one-way valve (8); the rear end cover (3) is connected with a second plunger cylinder (9); a second piston rod (10) is arranged in the second plunger cylinder (9); the second oil suction rod (11) is communicated with the second plunger cylinder (9); a second one-way valve (12) is arranged between the second oil suction rod (11) and the second plunger cylinder (9); the oil inlet is communicated with the first plunger cylinder (5) and the second plunger cylinder (9), and the oil outlet is communicated with the oil outlet (4) of the manual hydraulic pump through a third one-way valve (14) and a fourth one-way valve (15); the oil sucking device is characterized in that a load unloading rod (23) is arranged at a F-shaped opening in the middle of the rear end cover (3), the load unloading rod is communicated with the one-way valve and is parallel to the first oil sucking rod (7) and the second oil sucking rod (11), and filters (24) are arranged at oil inlets of the first oil sucking rod and the second oil sucking rod.

2. The manual hydraulic pump according to claim 1, wherein the unloading rod (23) is an elongated circular rod having a through hole therein, the front portion of the rod is screw-coupled to the rear end cap (3), and the rear end face thereof is formed with a cross-shaped groove; the length of the unloading rod (23) is higher than that of the first oil suction rod (7) and the second oil suction rod (11).