CN213206148U

CN213206148U - Multi-way valve

Info

Publication number: CN213206148U
Application number: CN202022192512.6U
Authority: CN
Inventors: 卢佳杰; 许志远; 贺犇
Original assignee: Zhejiang Haihong Hydraulic Technology Co ltd
Current assignee: Zhejiang Haihong Hydraulic Technology Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-05-14
Anticipated expiration: 2030-09-29

Abstract

The utility model provides a multi-way valve belongs to hydraulic pressure technical field. The multi-way valve solves the problem that the oil pressure of the working oil way of the existing multi-way valve is unstable. The multi-way valve comprises a main oil inlet path, a main oil outlet path, an overflow valve, a control oil path and a plurality of valve groups, wherein each valve group comprises a pressure reversing valve and a compensation valve, an oil inlet of the pressure reversing valve is communicated with the main oil inlet path, a pressure oil port of the pressure reversing valve is communicated with an oil inlet of the pressure reversing valve through the compensation valve, an oil outlet of the pressure reversing valve is communicated with the main oil outlet path, and a control oil path is communicated with the main oil outlet path through the overflow valve. The multi-way valve is more stable in use.

Description

Multi-way valve

Technical Field

The utility model belongs to the technical field of hydraulic pressure, a multiple unit valve is related to.

Background

When working, a working vehicle (such as a fire truck, a high-altitude vehicle, a crane, etc.) usually needs to be switched among different actions, so that the oil way of the working vehicle needs to be controlled by adopting a multi-way valve.

The conventional multi-way valve is generally used for controlling a plurality of oil ways, and as disclosed in the chinese patent application (patent application No. 201210059967.8), the multi-way valve comprises an oil pump and a plurality of valve groups, wherein each valve group comprises an oil inlet, an oil outlet, a feedback oil port and a valve plate, the oil inlet of each valve group is connected to the oil outlet of the oil pump, the oil outlet of each valve group is connected to the oil tank, the feedback oil ports of each valve group are connected to each other, the valve plate comprises a reversing valve, a shuttle valve, a pressure compensation valve, a first external working oil port and a second external working oil port, and the reversing valve comprises a pressure oil port, a first oil return port and a second oil return port. The hydraulic control device comprises a first working oil port and a second working oil port, a reversing valve comprises a stop station, a first reversing station and a second reversing station, a pressure oil port of the reversing valve is connected with an oil inlet of a valve block through a pressure compensation valve, a first oil return port and a second oil return port of the reversing valve are connected with an oil outlet of the valve block, a first working oil port of the reversing valve is connected with a first external working oil port of a valve block, a second working oil port of the reversing valve is connected with a second external working oil port of the valve block, the pressure difference between the pressure oil port of the reversing valve and the first working oil port of the reversing valve and/or the second working oil port of the reversing valve is kept constant through the pressure compensation valve, the valve block comprises at least two valve blocks which are arranged in sequence, the valve block compares the first working oil port and/or the second working oil port of each valve block of the valve block with the oil return pressure of, and the pressure oil with the maximum pressure is output to a feedback oil port of the valve group through a check valve.

Although the oil pressure of the control oil way is adjusted through the overflow valve, the multi-way valve can be used for opening the overflow valve and discharging oil when the oil pressure of the control oil way is higher than a set value of the overflow valve, the load can stop running at any time on a working oil way, when the load is in a sudden stop, the working oil way is directly communicated with an oil tank, a large amount of oil can directly flow into a mailbox quickly from the working oil way, certain impact force can be generated on a pressure compensation method, a reversing valve and the like in the oil flowing process, the service lives of the pressure compensation method and the reversing valve are influenced, and the working oil way is not stable in use.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a multi-way valve, the utility model aims to solve the technical problem that: how to solve the unstable problem of the working oil circuit's of current multiple unit valve oil liquid pressure.

The purpose of the utility model can be realized by the following technical proposal:

the multi-way valve is characterized by further comprising an unloading valve, the oil pressure of the control oil port of the compensating valve is equal to the elastic force of a valve core spring at the rear end of the unloading valve by a fixed pressure difference, the main oil inlet path is communicated with the front end of the unloading valve, and the oil unloading port of the unloading valve is communicated with the main oil outlet path when the pressure of oil borne by the front end of the unloading valve is greater than the fixed pressure difference at the rear end of the unloading valve.

The working principle is as follows: when the multi-way valve does not work, the pressure reversing valve in each valve group is disconnected, and the oil liquid flowing out of the oil pump is directly communicated with the front end of the unloading valve from the main oil inlet path and is discharged to the main oil outlet path from the oil unloading port of the unloading valve to return to the oil tank: when the multi-way valve works, the pressure reversing valve can be manually opened, oil liquid flowing out of the oil pump sequentially flows into the valve groups and flows into the compensating valve through the pressure reversing valve, when the oil liquid reaches a certain pressure value, the compensating valve is communicated, an oil outlet of the compensating valve is communicated with an oil inlet of the pressure reversing valve, the oil liquid in the pressure reversing valve flows out of the oil outlet and flows to a load for load work, residual oil liquid after the load work flows into the main oil outlet circuit through the pressure reversing valve again and returns into the oil tank, the control oil circuit can be communicated with the main oil outlet circuit through the overflow valve at the moment, the oil pressure in the control oil circuit is ensured to be stable, the oil pressure of the control oil port of the compensating valve can be equal to the elastic force of a valve core at the rear end of the unloading valve and is a fixed pressure difference, and when the oil pressure of the main oil inlet circuit is greater than the fixed pressure difference, the oil in the main oil inlet path can directly flow into the oil tank through the main oil outlet path, and the oil in the main oil inlet path can be ensured to quickly flow into the oil tank from the unloading valve; when the valve bank is in a sudden stop, the unloading valve can quickly discharge oil in the main oil inlet path into the oil tank, so that the pressure reversing valve and the compensating valve in the valve bank are prevented from being impacted, the service lives of the pressure reversing valve, the compensating valve and the like are prolonged, and the use stability of the multi-way valve is further improved.

In the multi-way valve, a shuttle valve is arranged between two adjacent valve groups, an oil inlet of the shuttle valve is communicated with an oil outlet of a compensation valve in the previous valve group, an oil outlet of the shuttle valve is communicated with an oil outlet of a compensation valve in the next valve group, and an oil inlet of the overflow valve and the front end of the unloading valve are both communicated with a control oil port of the shuttle valve.

Through setting up the shuttle valve between the oil-out of the compensating valve of two valves, make when the oil pressure of the oil-out of two compensating valves equals, when also being the oil pressure of the oil inlet of pressure switching-over valve equals, fluid is from shuttle valve internal stability circulation, when the oil pressure of the oil-out of preceding valves compensating valve is greater than the oil pressure of the oil-out of back valves compensating valve, in order to keep the oil pressure balance of two valves this moment, the shuttle valve can be under the effect of the oil pressure difference of two compensation methods oil-outs the oil inlet of overflow valve and the front end of off-load valve are arranged into to unnecessary fluid from the control hydraulic fluid port, further assurance the oil pressure between each valves is stable, further promotion the stability of multiple unit valve use.

In the multi-way valve, the control oil port of the compensation valve and the control oil port of the shuttle valve are both communicated with the oil inlet of the overflow valve, and the oil pressure of the control oil port of the compensation valve is equal to the oil pressure of the control oil port of the shuttle valve.

Through the control hydraulic fluid port with compensating valve and the control hydraulic fluid port of shuttle valve all with the oil inlet intercommunication of overflow valve, under the effect of overflow valve for the oil pressure of the control hydraulic fluid port of compensating valve equals with the oil pressure of the control hydraulic fluid port of shuttle valve, thereby can make the more stable of oil pressure of the control hydraulic fluid port of compensating valve, guaranteed that the fixed pressure differential of unloading valve rear end can keep invariable, thereby can further promote the stability that the multiple unit valve used.

In the above-described multiplex valve, the compensation valve is located on the rear side of the pressure change valve.

When the oil that the oil pump provided is less, the compensation valve can be through the cooperation with the shuttle valve simultaneously for the fluid supply of the load in each valves reduces in step, makes the effect of the action coordination of all loads, and then has promoted the stability of multiple unit valve drive load motion.

In the multi-way valve, the overflow valve is provided with a fixed pressure value of 18.3 MPa.

The fixed pressure value can be changed according to actual needs, and the overflow valve can be ensured not to lead oil in the control oil way into the oil tank when the overflow valve is less than 18.3MPa, so that the overflow valve is more stable to use and convenient to adjust.

In the multi-way valve, the unloading valve is provided with two openings, wherein the caliber of one opening is smaller than that of the other opening, and the other opening is positioned below one opening.

The two openings are arranged, so that when the multi-way valve normally moves, only one opening is opened by the unloading valve, oil can slowly and stably flow into the oil tank, when the load suddenly stops or the multi-way valve does not work, the other opening can be opened to quickly guide the oil into the oil tank, and the use stability of the multi-way valve is further improved.

Compared with the prior art, this multiple valve has the advantage: when the oil pressure of the main oil inlet path is greater than the fixed pressure difference at the rear end of the unloading valve, the oil discharging port of the unloading valve is communicated with the main oil outlet path, oil in the main oil inlet path can directly flow into the oil tank through the main oil outlet path, the fact that the oil in the main oil inlet path can quickly flow into the oil tank from the unloading valve is guaranteed, when the valve group is in emergency stop, the oil in the main oil inlet path can be quickly discharged into the oil tank by the unloading valve, the pressure reversing valve and the compensating valve in the valve group are prevented from being impacted, the service lives of the pressure reversing valve, the compensating valve and the like are prolonged, and the use stability of the multi-way valve is further improved.

Drawings

FIG. 1 is a schematic diagram of the present multiplex valve.

In the figure, 1, a main oil inlet path; 2. a main oil outlet path; 3. an overflow valve; 4. controlling an oil path; 5. a valve block; 6. a pressure reversing valve; 7. a compensation valve; 8. an unloading valve; 81. an opening; 9. a shuttle valve.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, the multi-way valve includes a main oil inlet path 1, a main oil outlet path 2, an overflow valve 3, a control oil path 4 and a plurality of valve groups 5, each valve group 5 includes a pressure reversing valve 6 and a compensation valve 7, an oil inlet of the pressure reversing valve 6 is communicated with the main oil inlet path 1, the pressure reversing valve 6 needs to be manually opened, oil of the pressure reversing valve 6 directly flows into the compensation valve 7 through a pressure oil port, the compensation valve 7 increases pressure of the oil in the compensation valve 7 by setting elastic force of a spool spring in the compensation valve 7, when the oil pressure is greater than the elastic force of the spool spring in the compensation valve 7, the compensation valve 7 is internally communicated and flows the oil from the compensation valve 7 into the oil inlet of the pressure reversing valve 6, the oil inlet of the pressure reversing valve 6 flows into a load from a1 and drives the load to move, residual oil after the load moves can flow into the pressure reversing valve 6 through B1 and flow into the main oil outlet path 2 and flow into an oil tank from the oil outlet, when the load needs to be driven to move reversely, the pressure reversing valve 6 can be directly and manually reversed, so that oil flowing into an oil inlet of the pressure reversing valve 6 flows into the load from B1 and drives the load to move, the residual oil after the load moves can flow into the pressure reversing valve 6 through A1 and flows into the main oil outlet 2 from an oil outlet of the pressure reversing valve 6 and flows into an oil tank, and the compensation valve 7 is positioned at the rear side of the pressure reversing valve 6.

A control oil port of the compensating valve 7 is communicated with the control oil path 4, so that when the oil pressure in the compensating valve 7 is too high, the oil can be directly discharged into the control oil path 4, an overflow valve 3 is arranged between the control oil path 4 and the main oil outlet path 2, and the set value of the overflow valve 3 is 18.3MPa in the embodiment; when the oil pressure in the control oil path 4 is more than 18.3MPa, the overflow valve 3 enables part of oil to flow into the main oil outlet path 2 and flow into the oil tank; when the oil pressure in the control oil passage 4 is less than 18.3MPa, the relief valve 3 disconnects the control oil passage 4 from the main oil passage 2.

The multi-way valve also comprises an unloading valve 8, the oil pressure of a control oil port of the compensation valve 7 is equal to the elastic force of a valve core spring at the rear end of the unloading valve 8 and is a fixed pressure difference, a main oil way is communicated with the front end of the unloading valve 8, and when the pressure of oil liquid received by the front end of the unloading valve 8 is greater than the fixed pressure difference at the rear end of the unloading valve 8, the oil unloading port of the unloading valve 8 is communicated with the main oil outlet way 2; when the pressure of the oil liquid on the front end of the unloading valve 8 is smaller than the fixed pressure difference on the rear end of the unloading valve 8, the unloading valve 8 disconnects the main oil inlet path and the main oil outlet path; the unloading valve 8 has two openings 81, wherein the caliber of one opening 81 is smaller than that of the other opening 81, and the other opening 81 is positioned below the one opening 81; when the oil tank normally moves, only one opening 81 of the unloading valve 8 needs to be opened, so that oil can slowly and stably flow into the oil tank, and when a load suddenly stops or the multi-way valve does not work, the other opening 81 can be opened to quickly guide the oil into the oil tank.

A shuttle valve 9 is arranged between two adjacent valve banks 5, an oil inlet of the shuttle valve 9 is communicated with an oil outlet of a compensation valve 7 in the previous valve bank 5, an oil outlet of the shuttle valve 9 is communicated with an oil outlet of the compensation valve 7 in the next valve bank 5, an oil inlet of the overflow valve 3 and the front end of the unloading valve 8 are both communicated with a control oil port of the shuttle valve 9, a control oil port of the compensation valve 7 and a control oil port of the shuttle valve 9 are both communicated with an oil inlet of the overflow valve 3, and the oil pressure of the control oil port of the compensation valve 7 is equal to that of the shuttle valve 9.

The working principle is as follows: when the multi-way valve does not work, the pressure reversing valves 6 in each valve group 5 are disconnected, at the moment, oil flowing out of the oil pump is directly communicated with the front ends of the unloading valves 8 from the main oil inlet path 1, and is discharged to the main oil outlet path 2 from the oil discharging ports of the unloading valves 8 to return to the oil tank: when the multi-way valve works, the pressure reversing valve 6 can be manually opened, oil flowing out of the oil pump sequentially flows into the valve groups 5, flows into the compensating valve 7 through the pressure reversing valve 6, when the oil reaches a certain pressure value, the compensating valve 7 is communicated, an oil outlet of the compensating valve 7 is communicated with an oil inlet of the pressure reversing valve 6 at the moment, the oil in the pressure reversing valve 6 flows out of the oil outlet and flows to a load for load work, the residual oil after the load work flows into the main oil outlet 2 through the pressure reversing valve 6 again and returns to the oil tank, the control oil way 4 can be communicated with the main oil outlet 2 through the overflow valve 3 at the moment, the oil pressure in the control oil way 4 is ensured to be stable, the oil pressure of the control oil port of the compensating valve 7 can be equal to the elastic force of a valve core at the rear end of the unloading valve 8 and is a fixed pressure difference, when the oil pressure of the main oil inlet 1 is greater than the fixed pressure difference at the rear end of, the oil in the main oil inlet path 1 can directly flow into the oil tank through the main oil outlet path 2, and the oil in the main oil inlet path 1 can be ensured to quickly flow into the oil tank from the unloading valve 8; when the valve group 5 is in a sudden stop, the unloading valve 8 can quickly discharge oil in the main oil inlet path 1 into the oil tank, so that the pressure reversing valve 6 and the compensating valve 7 in the valve group 5 are prevented from being impacted, the service lives of the pressure reversing valve 6, the compensating valve 7 and the like are prolonged, and the use stability of the multi-way valve is further improved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A multi-way valve comprises a main oil inlet path (1), a main oil outlet path (2), an overflow valve (3), a control oil path (4) and a plurality of valve banks (5), wherein each valve bank (5) comprises a pressure reversing valve (6) and a compensation valve (7), an oil inlet of the pressure reversing valve (6) is communicated with the main oil inlet path (1), a pressure oil port of the pressure reversing valve (6) is communicated with an oil inlet of the pressure reversing valve (6) through the compensation valve (7), an oil outlet of the pressure reversing valve (6) is communicated with the main oil outlet path (2), the control oil path (4) is communicated with the main oil outlet path (2) through the overflow valve (3), the multi-way valve is characterized by further comprising an unloading valve (8), the oil pressure of the control oil port of the compensation valve (7) is equal to the elastic force of a valve core spring at the rear end of the unloading valve (8) by a fixed pressure difference, and the main oil inlet path (1) is communicated with the front end of the unloading valve (, when the pressure of the oil liquid on the front end of the unloading valve (8) is larger than the fixed pressure difference on the rear end of the unloading valve (8), the oil discharging port of the unloading valve (8) is communicated with the main oil outlet path (2).

2. The multiway valve of claim 1, wherein a shuttle valve (9) is arranged between two adjacent valve banks (5), an oil inlet of the shuttle valve (9) is communicated with an oil outlet of a compensation valve (7) in a previous valve bank (5), an oil outlet of the shuttle valve (9) is communicated with an oil outlet of a compensation valve (7) in a next valve bank (5), and an oil inlet of the overflow valve (3) and a front end of the unloading valve (8) are both communicated with a control oil port of the shuttle valve (9).

3. The multi-way valve according to claim 2, characterized in that the control oil port of the compensation valve (7) and the control oil port of the shuttle valve (9) are both communicated with the oil inlet of the overflow valve (3), and the oil pressure of the control oil port of the compensation valve (7) is equal to the oil pressure of the control oil port of the shuttle valve (9).

4. Multiple-way valve according to claim 1, 2 or 3, characterized in that the compensation valve (7) is located on the rear side of the pressure reversing valve (6).

5. Multiple-way valve according to claim 1, 2 or 3, characterized in that the relief valve (3) is provided with a fixed pressure value of 18.3 MPa.

6. Multiple-way valve according to claim 1 or 2 or 3, characterized in that the relief valve (8) has two openings (81), wherein the aperture of one opening (81) is smaller than the aperture of the other opening (81), and the other opening (81) is located below the one opening (81).