CN211901140U

CN211901140U - Flushing valve with flow unaffected by pressure change

Info

Publication number: CN211901140U
Application number: CN202020481312.XU
Authority: CN
Inventors: 樊百夫
Original assignee: Zhantuo Hydraulic Shanghai Co ltd
Current assignee: Zhantuo Hydraulic Shanghai Co ltd
Priority date: 2020-04-05
Filing date: 2020-04-05
Publication date: 2020-11-10
Anticipated expiration: 2030-04-05

Abstract

The utility model discloses a flushometer that flow is not influenced by pressure change, including valve body, flow stabilizer subassembly and switching-over valve subassembly, the both ends of valve body all are provided with the switching-over valve subassembly, the flow stabilizer subassembly sets up the bottom at the valve body, set up on the valve body with flow stabilizer subassembly and switching-over valve subassembly assorted mounting hole, the flow stabilizer subassembly includes first plug, first spring, decompression valve barrel and decompression case, the utility model discloses the beneficial effect who reaches is: the utility model discloses install on motor housing, a small amount of hydraulic oil in the low pressure pipeline with in the closed system passes through the flushometer and flows back the oil tank to the renewal and the cooling of fluid in the realization pipeline have finally prolonged closed system's life, and improve work efficiency, effectually compensate present flushometer flow can receive the pressure change and change not enough, make the flushing flow unchangeable all the time in the course of the work, thereby make the system effective and stable.

Description

Flushing valve with flow unaffected by pressure change

Technical Field

The utility model relates to a flow is not influenced by pressure change's flushometer belongs to the hydraulic control valve field.

Background

In a closed system formed by a hydraulic pump and a motor, after long-time operation, due to the existence of friction pairs and the reduction of volumetric efficiency, the cleanliness of hydraulic oil circulating inside is poor, the oil temperature is increased, and therefore a flushing valve is required to flush a closed loop. The working principle of the flushing valve is that the high-pressure side in the port A, B reverses the reversing valve, so that oil on the low-pressure side enters the overflow valve through the damper and finally flows back to the oil tank through the T port, referring to the attached figure 2 of the specification; the flushing valve shown in figure 2 is installed in most closed systems currently, an A, B port of the flushing valve is respectively connected with an oil inlet and outlet pipeline of a motor or an oil pump, and a T port is connected with a shell of the motor or the oil pump or is connected with an oil tank; the hydraulic pressure in the low-pressure line may vary from 20bar to 40bar, which for the flushing valve of fig. 2 results in a large variation of the flushing flow, and for a small-flow closed system, too much loss of the flushing flow results in a reduction of the effective power of the system, affecting the performance.

SUMMERY OF THE UTILITY MODEL

The utility model provides a flow is not influenced by pressure change's flushometer, the effectual problem of having solved existence among the prior art.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model relates to a flushometer that flow is not influenced by pressure change, including valve body, flow stabilizer subassembly and switching-over valve subassembly, the both ends of valve body all are provided with the switching-over valve subassembly, the flow stabilizer subassembly sets up in the bottom of valve body, set up the mounting hole that matches with flow stabilizer subassembly and switching-over valve subassembly on the valve body, the flow stabilizer subassembly includes first plug, first spring, decompression valve barrel and decompression case, first plug screw is pegged graft in the bottom of valve body, the top of first plug is pegged graft and is had decompression valve barrel, the inside of decompression valve barrel is pegged graft and is had decompression case, the bottom of decompression case is provided with first spring, the other end of first spring is connected with the interior diapire of first plug, the switching-over valve subassembly includes switching-over case, second plug and second spring, two the second plug is the both ends of screw grafting valve body respectively, and a second spring is arranged in the second plug, and the other end of the second spring is connected with a reversing valve core.

As a preferred technical scheme of the utility model, first sealing washer has been cup jointed on first plug's the outer wall, first sealing washer and valve body laminating, it is connected with the second sealing washer to inlay on the outer wall at decompression valve barrel top.

As an optimized technical scheme of the utility model, the third sealing washer has been cup jointed on the outer wall of second plug, third sealing washer and valve body laminating.

As a preferred technical scheme of the utility model, the pressure reduction case excircle adopts clearance fit with the pressure reduction valve barrel hole, the interior terminal surface and the interior terminal surface excircle diameter of pressure reduction case are arranged in to first spring slightly are greater than pressure reduction case and pressure reduction valve barrel complex excircle diameter.

The utility model discloses the beneficial effect who reaches is: the utility model discloses install on motor housing, a small amount of hydraulic oil in the low pressure pipeline with in the closed system passes through the flushometer and flows back the oil tank to the renewal and the cooling of fluid in the realization pipeline have finally prolonged closed system's life, and improve work efficiency, effectually compensate present flushometer flow can receive the pressure change and change not enough, make the flushing flow unchangeable all the time in the course of the work, thereby make the system effective and stable.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

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

FIG. 2 is a hydraulic schematic of a prior art flush valve;

fig. 3 is a hydraulic schematic diagram of the flush valve of the present invention.

In the figure: 1. a valve body; 2. a first seal ring; 3. a first plug; 4. a first spring; 5. a pressure reducing valve housing; 6. a pressure reducing valve core; 7. a second seal ring; 8. a flow stabilizer assembly; 11. a reversing valve assembly; 12. a reversing valve core; 13. a third seal ring; 14. a second plug; 15. a second spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example (b): as shown in fig. 1-3, the utility model relates to a flushometer that flow is not influenced by pressure change, including valve body 1, flow stabilizer subassembly 8 and reversing valve subassembly 11, the both ends of valve body 1 all are provided with reversing valve subassembly 11, flow stabilizer subassembly 8 sets up the bottom at valve body 1, set up on valve body 1 with flow stabilizer subassembly 8 and reversing valve subassembly 11 assorted mounting hole, flow stabilizer subassembly 8 includes first plug 3, first spring 4, decompression valve barrel 5 and decompression case 6, first plug 3 screw thread is pegged graft in the bottom of valve body 1, decompression valve barrel 5 is pegged graft at the top of first plug 3, decompression case 6 is pegged graft in the inside of decompression valve barrel 5, the bottom of decompression valve barrel 6 is provided with first spring 4, the other end of first spring 4 is connected with the inner diapire of first plug 3, reversing valve subassembly 11 includes reversing valve case 12, The two second plugs 14 are respectively in threaded connection with two ends of the valve body 1, the second spring 15 is arranged inside the second plug 14, and the other end of the second spring 15 is connected with the reversing valve core 12.

First sealing washer 2 has been cup jointed on the outer wall of first plug 3, first sealing washer 2 and the laminating of valve body 1, it is connected with second sealing washer 7 to inlay on the outer wall at decompression valve barrel 5 top, first sealing washer 2 can make the sealed effect between first plug 3 and the valve body 1 better, cup joint third sealing washer 13 on the outer wall of second plug 14, third sealing washer 13 and the laminating of valve body 1, third sealing washer 13 can make the sealed effect between second plug 14 and the valve body 1 better, decompression case 6 excircle and decompression valve barrel 5 hole adopt clearance fit, interior terminal surface and interior terminal surface excircle diameter of decompression case 6 are arranged in to first spring 4 and are slightly greater than decompression case 6 and decompression valve barrel 5 complex excircle diameter.

Specifically, referring to fig. 3 and fig. 2, the combination of the damper and the relief valve in the flush valve is changed into the combination of the damper and the relief valve, so that the flush flow is stabilized, the flow value is in direct proportion to the value of the damping hole (r), and the combination of the damper and the relief valve is a threaded cartridge type flow stabilizer part which is installed at the position of the original relief valve assembly.

Referring to the attached figure 1, a and B are respectively connected with oil inlet and outlet pipelines of a pump or a motor in a closed system, assuming that a high-pressure pipeline is connected with an opening A of a flushing valve, a reversing valve core 12 moves rightwards under the hydraulic pressure, hydraulic oil in a low-pressure pipeline enters a flow passage C through an opening B, the hydraulic pressure pushes a pressure reducing valve core 6 to overcome the spring force and then move downwards, meanwhile, the hydraulic oil enters a valve core central hole through a damping hole in the middle of the pressure reducing valve core 6, flows out to an opening T through radial holes of the pressure reducing valve core 6 and a pressure reducing valve sleeve 5, and.

When the pressure reducing valve core 6 moves downwards, the flow area of the oil hole on the pressure reducing valve sleeve 5 is reduced, so that the pressure of the spring cavity of the pressure reducing valve core 6 is increased, and the valve core is balanced at a certain position after the two ends of the pressure reducing valve core 6 are stressed in a balanced manner; because the stroke of the valve core is small and the change of the spring force is small, the pressure difference at two ends of the valve core is almost unchanged, and the flow passing through the damping hole at the end surface of the pressure reducing valve core 6 is almost unchanged. When the pressure on the low pressure side varies from 20bar to 40bar, the variation of the flushing flow is not more than 0.5L/min.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The flushing valve with the flow unaffected by pressure changes is characterized by comprising a valve body (1), a flow stabilizer assembly (8) and a reversing valve assembly (11), wherein the reversing valve assembly (11) is arranged at each of two ends of the valve body (1), the flow stabilizer assembly (8) is arranged at the bottom of the valve body (1), mounting holes matched with the flow stabilizer assembly (8) and the reversing valve assembly (11) are formed in the valve body (1), the flow stabilizer assembly (8) comprises a first plug (3), a first spring (4), a pressure reducing valve sleeve (5) and a pressure reducing valve core (6), the first plug (3) is inserted into the bottom of the valve body (1) in a threaded manner, the pressure reducing valve sleeve (5) is inserted into the top of the first plug (3), the pressure reducing valve core (6) is inserted into the pressure reducing valve sleeve (5), and the first spring (4) is arranged at the bottom of the pressure reducing valve core (6), the other end of the first spring (4) is connected with the inner bottom wall of the first plug (3), the reversing valve assembly (11) comprises a reversing valve core (12), second plugs (14) and second springs (15), the two second plugs (14) are respectively in threaded connection with the two ends of the valve body (1), the second springs (15) are arranged inside the second plugs (14), and the other ends of the second springs (15) are connected with the reversing valve core (12).

2. The flushing valve with the flow unaffected by pressure change as claimed in claim 1, wherein the outer wall of the first plug (3) is sleeved with a first sealing ring (2), the first sealing ring (2) is attached to the valve body (1), and the outer wall of the top of the pressure reducing valve sleeve (5) is connected with a second sealing ring (7) in an embedded manner.

3. The flushing valve with the flow unaffected by pressure changes as set forth in claim 1, characterized in that a third sealing ring (13) is sleeved on the outer wall of the second plug (14), and the third sealing ring (13) is attached to the valve body (1).

4. The flushing valve with the flow unaffected by pressure changes as claimed in claim 1, wherein the outer circle of the pressure reducing valve core (6) is in clearance fit with the inner hole of the pressure reducing valve sleeve (5), the first spring (4) is placed on the inner end face of the pressure reducing valve core (6), and the outer circle diameter of the inner end face is slightly larger than that of the pressure reducing valve core (6) in fit with the pressure reducing valve sleeve (5).