CN212297100U - Brake valve - Google Patents
Brake valve Download PDFInfo
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- CN212297100U CN212297100U CN202022191187.1U CN202022191187U CN212297100U CN 212297100 U CN212297100 U CN 212297100U CN 202022191187 U CN202022191187 U CN 202022191187U CN 212297100 U CN212297100 U CN 212297100U
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- valve
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- brake
- stop valve
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Abstract
The utility model provides a brake valve belongs to hydraulic pressure technical field. The brake valve solves the problem that oil in the existing brake valve leaks. The brake valve comprises a valve body with an oil inlet path and a working oil path, wherein the oil inlet path is communicated with the working oil path, a check valve for controlling the on-off of the oil inlet path is arranged on the oil inlet path, a first bidirectional stop valve arranged in a normally closed mode and a second bidirectional stop valve arranged in a normally open mode are arranged on the oil inlet path, the check valve is positioned between an inlet of the oil inlet path and the first bidirectional stop valve, an inlet of the working oil path is positioned between the first bidirectional stop valve and the second bidirectional stop valve, and when the first bidirectional stop valve is opened, the second bidirectional stop valve is closed. The brake valve has the advantage of reducing the internal leakage of oil in the brake valve.
Description
Technical Field
The utility model belongs to the technical field of hydraulic pressure, a brake valve is related to.
Background
The normal operation of the brake valve provides technical support for smooth braking of the vehicle. For example, chinese patent literature discloses a hydraulic parking brake system for an electric forklift and an electric forklift [ patent No.: 202010130197.6, respectively; application publication No.: CN111153354A includes brake oil circuit, brake cylinder and control brake valve piece of control brake cylinder action, and the brake valve piece has oil inlet, working fluid port and oil return opening, and the brake valve includes second check valve, two three-way solenoid valve, relief pressure valve, first check valve and detects the pressure switch of entering brake cylinder oil hydraulic pressure. When the brake cylinder is unlocked, the two-position three-way electromagnetic valve is electrified and opened, oil flows into the brake cylinder sequentially through the second one-way valve, the two-position three-way electromagnetic valve, the pressure reducing valve and the working oil port, and when the brake cylinder is restored to be locked, the oil in the brake cylinder sequentially flows to the oil return tank sequentially through the first one-way valve, the two-position three-way electromagnetic valve and the oil return port.
The brake valve block can control the operation of the brake cylinder. When the brake cylinder is unlocked, oil entering from the second one-way valve flows to the brake cylinder through the two-position three-way electromagnetic valve; when the brake cylinder is locked again, oil passing through the two-position three-way electromagnetic valve flows back to the oil tank. Because the oil inlet of the brake valve block in the prior art is communicated with the three-way pipe of the oil inlet of the steering gear, namely only when the steering gear works, oil can flow in from the oil inlet of the steering gear, and then the oil inlet of the steering gear can only have the oil flowing to the oil inlet of the brake valve block through the three-way pipe. Further, if the oil flowing into the brake valve block is not enough to release the brake of the brake valve block, the steering gear needs to work, and the oil at the oil inlet of the steering gear supplies oil to the oil inlet of the brake valve block.
In order to solve the above technical problem, it is a conventional and easily conceivable way for a person skilled in the art to store the oil entering the brake valve block, for example, an accumulator is externally arranged, when the brake cylinder is locked, the two-position three-way solenoid valve is in a closed state, and the oil entering from the second one-way valve flows to the accumulator for storage. It is also conventionally conceivable to provide the oil passage for supplying oil to the brake valve block separately, for example, by providing an oil pump for supplying oil to the brake valve block separately, so as to prevent the oil flowing into the brake valve block from being insufficient to release the brake valve block.
When the brake cylinder is unlocked, oil passing through the second one-way valve and oil in the accumulator both flow to the brake cylinder through the two-position three-way electromagnetic valve. The oil passing through the two-position three-way electromagnetic valve needs to be larger than the oil flowing into the brake cylinder to release the actual braking. When the brake cylinder is locked again, oil which does not enter the brake cylinder flows back to the oil tank along with oil which flows out of the brake cylinder, so that the problem of internal leakage of the oil in the brake valve block exists.
Disclosure of Invention
The utility model aims at the above-mentioned problem that exists among the prior art, provide a brake valve, solve the problem of leaking including the fluid existence in the brake valve.
The purpose of the utility model can be realized by the following technical proposal: the brake valve comprises a valve body with an oil inlet path and a working oil path, wherein the oil inlet path is communicated with the working oil path, and the oil inlet path is provided with a check valve for controlling the on-off of the oil inlet path.
The brake valve is provided with an oil inlet P for oil to flow into the valve body, a working oil outlet A for oil to flow out to the brake cylinder and an oil outlet T for oil in the oil supply valve body to flow back to an oil tank. The inlet P of the oil inlet of the valve body can be communicated with a three-way pipe of an oil inlet of the steering gear, so that part of oil at the oil inlet of the steering gear can flow in from the inlet P of the oil inlet of the valve body through the three-way pipe to supply oil for the brake valve. The check valve is arranged on the oil inlet path, so that oil on the oil inlet path flows in a single direction, namely, the oil on the oil inlet path can only flow to the oil outlet from the inlet of the oil inlet path. The first bidirectional stop valve and the second bidirectional stop valve are arranged on the oil inlet path, so that the first bidirectional stop valve and the second bidirectional stop valve control the on-off of oil on the oil inlet path. The normally closed arrangement of the first bidirectional stop valve means that the stop valve blocks oil on the oil line from flowing under the condition of no work, and the normally open arrangement of the second bidirectional stop valve means that the oil on the oil line can pass through the stop valve under the condition of no work.
In general, the brake cylinder is in a braking state, no oil is in the brake cylinder at the moment, and only when the brake cylinder needs to be released, the oil needs to enter the brake cylinder through a working oil way to overcome the elastic force of a spring in the brake cylinder so as to push a piston in the brake cylinder to move and release the brake of the brake cylinder. Therefore, the check valve is provided between the inlet port of the oil supply passage and the first two-way cut-off valve, and the inlet port of the hydraulic oil passage is provided between the first two-way cut-off valve and the second two-way cut-off valve. When the brake cylinder is in a braking state, the first bidirectional stop valve blocks the circulation of oil, so that the oil passing through the check valve is stored between the check valve and the first stop valve, and the oil is prevented from flowing into the working oil way; when the brake cylinder needs to be relieved from a braking state, the first bidirectional stop valve is opened, the second bidirectional stop valve is closed, so that oil passing through the check valve and oil stored between the check valve and the first bidirectional stop valve all pass through the first bidirectional stop valve, the second bidirectional stop valve blocks the oil passing through the first bidirectional stop valve from flowing back to the oil tank, and the oil passing through the first bidirectional stop valve all flows into the brake cylinder through the working oil way.
Wherein, two-way stop valve is prior art, when two-way stop valve was opened, can realize the two-way flow of fluid, that is to say the fluid that has passed through first two-way stop valve can flow back to between check valve and the first two-way stop valve, avoids leaking in the fluid from this. Specifically, when the brake cylinder is released, in order to maintain the oil pressure on the working oil passage, the oil that does not flow into the brake cylinder is always present on the oil passage between the first and second two-way cut-off valves, and when the brake cylinder is returned to the braking state from the brake release, the oil in the brake cylinder flows back between the first and second two-way cut-off valves through the working oil passage, so that the oil pressure between the first and second two-way cut-off valves is increased, part of the oil enters between the first and one-way cut-off valves and remains, and after the first and second two-way cut-off valves are closed and opened, the oil in the brake cylinder flows back to the oil tank through the second two-way cut-off valve from the T port. Because partial fluid in the brake cylinder is retained between first two-way stop valve and check valve, avoid the fluid through first two-way stop valve all to flow from the two-way stop valve of second, and then reduce and let out in the fluid.
In the brake valve, an energy accumulator is arranged on the oil inlet path and is positioned between the first bidirectional stop valve and the one-way valve. Because of the normally closed arrangement of the first two-way stop valve, after the oil passes through the one-way valve, the oil can be stored in the energy accumulator. Simultaneously, this structure makes the energy storage ware locate in the valve body, makes brake valve compact structure on the one hand, and on the other hand is when the fluid through the check valve is not enough, and the energy storage ware can in time mend oil.
In the brake valve, the check valve has a first spring chamber, the oil inlet passage has a first flow passage communicated with the first spring chamber, and an outlet of the first flow passage is located between the accumulator and the first bidirectional stop valve. When the first two-way stop valve is opened, the oil flowing out of the first outlet of the flow path can pass through the first two-way stop valve before the stored oil in the accumulator. That is to say, if the fluid that passes through the check valve is sufficient for store fluid in the accumulator all the time, this structure is opened when first bidirectional stop valve, and the accumulator still can store fluid, avoids leaking in the fluid from this.
In the brake valve, the energy accumulator comprises a shell with a second spring cavity, a spring and a piston, the shell is fixedly connected with the valve body, the valve body is provided with a piston cavity for the piston to move, the piston is located in the piston cavity, one end of the spring abuts against the cavity wall of the second spring cavity, the other end of the spring abuts against the piston, and an outlet of the first flow path is located on the cavity wall of the piston cavity. Because the outlet of the first flow path is positioned on the wall of the piston cavity, when oil flows out from the outlet of the first flow path, the oil can push the piston to move, and the energy accumulator can store the oil passing through the one-way valve in time.
In the brake valve, the valve body is block-shaped, the first bidirectional stop valve is positioned on one side of the valve body, and the energy accumulator is positioned on the other side of the valve body. The valve block is regular in shape. The position of first two-way stop valve and energy storage ware sets up the arrangement of the oil inlet way of being convenient for on the one hand, and on the other hand, when the fluid through the check valve is not enough, the energy storage ware can in time mend oil to guarantee that the brake valve carries out unblock stability to the brake cylinder.
In the brake valve, the oil inlet path is provided with a pressure reducing valve, and the pressure reducing valve is positioned between the inlet of the oil inlet path and the one-way valve. The pressure reducing valve stabilizes the oil pressure passing through the check valve.
In the brake valve, the pressure reducing valve is provided with a third spring cavity, the third spring cavity is communicated with the second spring cavity, the valve body is further provided with an oil return path, and an inlet of the oil return path is communicated with the outlet sequentially through the third spring cavity and the second spring cavity. This structure makes third spring chamber and the export intercommunication that returns the oil circuit, and when fluid when the oil returns through third spring chamber, the oil liquid can form pressure in third spring chamber, avoids the external pressure oil in relief pressure valve spring chamber for valve body compact structure.
In the brake valve, the second two-way stop valve and the first two-way stop valve are both located on the same side of the valve body. This structure is convenient for arrange of oil inlet way, and shortens the length of arranging of oil inlet way, and when removing the braking to the brake cylinder, the fluid of detaining between first two-way stop valve and the two-way stop valve of second is less, and when the recovery braking of brake cylinder, the fluid of detaining between first two-way stop valve and the two-way stop valve of second can flow back to further avoid interior leaking.
In the brake valve, the working oil path is provided with a pressure switch. The pressure switch is used for detecting the oil circuit pressure on the working oil circuit, and the oil circuit pressure can be fed back in time if the oil pressure is abnormal, so that the working stability of the brake valve is ensured.
In the brake valve, the opening and closing of the first bidirectional stop valve and the opening and closing of the second bidirectional stop valve are both electromagnetically controlled. The structure improves the control precision of opening and closing the first bidirectional stop valve and the second bidirectional stop valve.
Compared with the prior art, the utility model provides a brake valve has following advantage:
1. when the brake cylinder recovers braking, oil flows out from an inlet of a working oil way, in the processes that the first bidirectional stop valve is closed and the second bidirectional stop valve is opened, the oil pressure on the oil way between the first bidirectional stop valve and the second bidirectional stop valve is increased, oil flows back, so that the oil between the first bidirectional stop valve and the second bidirectional stop valve flows back between the check valve and the first bidirectional stop valve, the oil passing through the first bidirectional stop valve is prevented from flowing out of the second bidirectional stop valve, and therefore internal leakage of the oil is avoided.
2. Locate the valve body with the energy storage ware in, make the storage that fluid through the check valve can be timely on the one hand, on the other hand opens when first bidirectional stop valve, but when the fluid through the check valve is not enough, the energy storage ware can in time mend oil, guarantees the job stabilization nature of brake valve.
Drawings
Fig. 1 is a hydraulic diagram of the present brake valve.
Fig. 2 is a plan view of the present brake valve.
Fig. 3 is a sectional view of B-B of fig. 2.
Fig. 4 is a front view of the present brake valve.
In the figure, 1, a valve body; 11. an oil inlet path; 111. a first flow path; 112. a second flow path; 12. a working oil path; 13. a piston cavity; 14. an oil return path;
2. a one-way valve; 21. a first spring chamber;
3. a first two-way stop valve;
4. a second bidirectional stop valve;
5. an accumulator; 51. a housing; 511. a second spring chamber; 52. a spring; 53. a piston;
6. a pressure reducing valve; 61. a third spring chamber;
7. a pressure switch;
8. and (4) a brake cylinder.
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 brake valve includes a block-shaped valve body 1, the valve body 1 has an oil inlet path 11, a working oil path 12 and an oil return path 14, and both the working oil path 12 and the oil return path 14 are communicated with the oil inlet path 11.
As shown in fig. 1 to 4, a pressure reducing valve 6, a check valve 2 for controlling the opening and closing of the oil inlet path 11, a normally closed first two-way stop valve 3, a normally open second two-way stop valve 4, and an accumulator 5 are provided in the oil inlet path 11. The first bidirectional stop valve 3 is located on one side of the valve body 1, the energy accumulator 5 is located on the other side of the valve body 1, and the second bidirectional stop valve 4 and the first bidirectional stop valve 3 are located on the same side of the valve body 1. The opening and closing of the first bidirectional stop valve 3 and the opening and closing of the second bidirectional stop valve 4 are both electromagnetically controlled, and the first bidirectional stop valve 3 and the second bidirectional stop valve 4 are both two-position two-way bidirectional stop valves.
As shown in fig. 1, the check valve 2 is located between the inlet of the oil inlet path and the first bidirectional stop valve 3, the pressure reducing valve 6 is located between the inlet of the oil inlet path and the check valve 2, the accumulator 5 is located between the first bidirectional stop valve 3 and the check valve 2, the inlet of the working oil path 12 is located between the first bidirectional stop valve 3 and the second bidirectional stop valve 4, and when the first bidirectional stop valve 3 is opened, the second bidirectional stop valve 4 is closed.
The check valve 2 has a first spring chamber 21, the oil inlet passage 11 has a first flow passage 111 communicating with the first spring chamber 21, and an outlet of the first flow passage 111 is located between the accumulator 5 and the first double check valve 3. As shown in fig. 3, the accumulator 5 includes a housing 51 having a second spring chamber 511, a spring 52 and a piston 53, the housing 51 is fixedly connected with the valve body 1, the valve body 1 has a piston chamber 13 for moving the piston 53, the piston 53 is located in the piston chamber 13, one end of the spring 52 abuts against the chamber wall of the second spring chamber 511, the other end abuts against the piston 53, and the outlet of the first flow path 111 is located on the chamber wall of the piston chamber 13.
As shown in fig. 1 and 3, the pressure reducing valve 6 has a third spring chamber 61, the third spring chamber 61 communicates with the second spring chamber 511, and the inlet of the return oil passage 14 communicates with the outlet via the third spring chamber 61 and the second spring chamber 511 in this order. The working oil path 12 is provided with a pressure switch 7, in this embodiment, the alarm pressure of the pressure switch 7 is 1.5MPa, the setting pressure of the pressure reducing valve 6 is 2MPa, in actual production, the alarm pressure of the pressure switch 7 may be 1MPa or 2MPa, and the setting pressure of the pressure reducing valve 6 may be 1.5MPa or 2.5 MPa.
When the steering gear works, oil flows in from an inlet of the oil inlet path, the oil sequentially passes through the pressure reducing valve 6 and the one-way valve 2, the oil pushes the piston 53 to move, the spring 52 is compressed, and the energy accumulator 5 accumulates energy. When the brake of the brake cylinder 8 is released, the first two-way stop valve 3 is opened, the second two-way stop valve 4 is closed, and at the moment, the brake fluid flows in from the inlet of the oil inlet passage, passes through the check valve 2, the first two-way stop valve 3 and the working oil passage 12 in sequence, enters the brake cylinder 8, and the brake of the brake cylinder 8 is released; when the brake cylinder 8 is braked again, the first two-way cut-off valve 3 is closed, the second two-way cut-off valve 4 is opened, so that the oil flows out of the second two-way cut-off valve 4, the oil in the hydraulic cylinder flows back to a position between the first two-way cut-off valve 3 and the second two-way cut-off valve 4 through the working oil path 12, and then the oil flowing out of the second two-way cut-off valve 4 flows back to the oil tank through the return oil path 14. When the oil passing through the check valve 2 is insufficient, the piston 53 moves back, so that the oil in the cylinder of the piston 53 passes through the first two-way stop valve 3.
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.
Although terms such as the valve body 1, the oil inlet passage 11, the first flow passage 111, the second flow passage 112, the working oil passage 12, the piston chamber 13, the return oil passage 14, the check valve 2, the first spring chamber 21, the first double check valve 3, the second double check valve 4, the accumulator 5, the housing 51, the second spring chamber 511, the spring 52, the piston 53, the pressure reducing valve 6, the third spring chamber 61, the pressure switch 7, the brake cylinder 8, etc., are used more frequently herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (10)
1. The utility model provides a brake valve, is including valve body (1) that has oil feed way (11) and working oil circuit (12), oil feed way (11) and working oil circuit (12) intercommunication, be equipped with check valve (2) of the break-make of control oil feed way (11) on oil feed way (11), its characterized in that, be equipped with first bidirectional stop valve (3) that the normal close set up and normally open second bidirectional stop valve (4) that set up on oil feed way (11), check valve (2) are located between oil feed way (11) entry and first bidirectional stop valve (3), the entry of working oil circuit (12) is located between first bidirectional stop valve (3) and second bidirectional stop valve (4), and when first bidirectional stop valve (3) were opened, second bidirectional stop valve (4) were closed.
2. Brake valve according to claim 1, characterized in that an accumulator (5) is provided on the oil inlet line (11), the accumulator (5) being located between the first two-way shut-off valve (3) and the one-way valve (2).
3. The brake valve according to claim 2, wherein the check valve (2) has a first spring chamber (21), the oil inlet passage (11) has a first flow passage (111) communicating with the first spring chamber (21), and an outlet of the first flow passage (111) is located between the accumulator (5) and the first two-way cut-off valve (3).
4. The brake valve according to claim 3, characterized in that the accumulator (5) comprises a housing (51) with a second spring chamber (511), a spring (52) and a piston (53), the housing (51) is fixedly connected with the valve body (1), the valve body (1) is provided with a piston chamber (13) for the piston (53) to move, the piston (53) is positioned in the piston chamber (13), one end of the spring (52) abuts against the chamber wall of the second spring chamber (511) and the other end abuts against the piston (53), and the outlet of the first flow path (111) is positioned on the chamber wall of the piston chamber (13).
5. A brake valve according to any one of claims 2-4, characterized in that the valve body (1) is block-shaped, that the first double check valve (3) is located on one side of the valve body (1), and that the accumulator (5) is located on the other side of the valve body (1).
6. A brake valve according to claim 4, characterized in that a pressure reducing valve (6) is arranged on the oil inlet (11), and the pressure reducing valve (6) is positioned between the inlet of the oil inlet (11) and the one-way valve (2).
7. The brake valve according to claim 6, characterized in that the pressure reducing valve (6) has a third spring chamber (61), the third spring chamber (61) is communicated with the second spring chamber (511), the valve body (1) further has an oil return path (14), and an inlet of the oil return path (14) is communicated with an outlet sequentially through the third spring chamber (61) and the second spring chamber (511).
8. A brake valve according to claim 5, characterized in that the second two-way shut-off valve (4) and the first two-way shut-off valve (3) are both located on the same side of the valve body (1).
9. A brake valve according to any one of claims 1 to 4, characterized in that a pressure switch (7) is provided on the working oil passage (12).
10. A brake valve according to any one of claims 1 to 4, characterized in that the opening and closing of the first two-way shut-off valve (3) and the opening and closing of the second two-way shut-off valve (4) are electromagnetically controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022191187.1U CN212297100U (en) | 2020-09-29 | 2020-09-29 | Brake valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022191187.1U CN212297100U (en) | 2020-09-29 | 2020-09-29 | Brake valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212297100U true CN212297100U (en) | 2021-01-05 |
Family
ID=73934086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022191187.1U Active CN212297100U (en) | 2020-09-29 | 2020-09-29 | Brake valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212297100U (en) |
-
2020
- 2020-09-29 CN CN202022191187.1U patent/CN212297100U/en active Active
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