CN219755454U

CN219755454U - Exhaust switch valve and hydraulic retarder

Info

Publication number: CN219755454U
Application number: CN202320624297.3U
Authority: CN
Inventors: 韩旭; 张晓丽; 张鸿雁; 徐国林; 杨启; 张欣宇; 李兴启; 王丽娜; 张樱玮
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2023-03-27
Filing date: 2023-03-27
Publication date: 2023-09-26
Anticipated expiration: 2033-03-27

Abstract

The utility model relates to the technical field of hydraulic retarders, in particular to an exhaust switch valve and a hydraulic retarder. The exhaust switch valve comprises a valve body, a valve cover and a piston column, wherein the bottom of the valve body is provided with a valve cavity with a downward opening, the top of the valve cavity is horizontally arranged, an air passage is arranged in the valve body, one end of the air passage is communicated with the top of the valve cavity, and the other end of the air passage extends to the outer side face of the valve body. The valve cover is arranged at the bottom of the valve body and seals the opening of the valve cavity, and an air hole communicated with the valve cavity is formed in the valve cover in a penetrating manner. The top end of the piston column can be tightly abutted against the top of the cavity to block the air passage and the air hole; alternatively, the tip of the plunger rod is disengaged from the lumen top to place the airway in communication with the air vent. The hydraulic retarder comprises the exhaust switch valve, the top of the valve cavity is horizontally arranged, the top of the piston column can be reliably sealed and abutted against the top of the valve cavity, the exhaust switch valve can be reliably opened and closed, and the residual pressure in the oil pool shell of the hydraulic retarder can be timely released.

Description

Exhaust switch valve and hydraulic retarder

Technical Field

The utility model relates to the technical field of hydraulic retarders, in particular to an exhaust switch valve and a hydraulic retarder.

Background

The hydraulic retarder is a device for generating anti-dragging torque on a vehicle by utilizing the damping effect of liquid flowing, plays an auxiliary braking role and is usually matched with a heavy cargo truck of a tractor at present. In order to improve the braking response and the exit performance of the hydraulic retarder, an exhaust switch valve is often arranged on an oil pool shell of the hydraulic retarder. When the hydraulic retarder is opened, high-pressure gas enters the valve cavity of the exhaust switch valve, so that the exhaust switch valve is closed, and the air pressure in the oil tank shell of the hydraulic retarder is ensured to be stable. When the hydraulic retarder is braked and exits, the internal high-pressure gas is rapidly discharged through the main gas path of the oil pool shell, the internal pressure of the valve cavity of the exhaust switch valve gradually decreases along with the reduction of the gas, the exhaust switch valve is finally opened, and the internal residual gas is discharged to the atmosphere from the exhaust switch valve, so that the residual pressure of the hydraulic retarder is released.

The valve cavity of the existing exhaust switch valve is arc-shaped, the inner piston is a sealing ball, and the valve cavity is opened and closed through the sealing ball. Because the processing degree of difficulty of sealing ball is great and the eccentric condition easily appears, lead to sealing ball and the inseparable laminating between the convex valve pocket of convex, lead to the valve body gas leakage, reduced the leakproofness of exhaust switch valve.

Disclosure of Invention

The utility model aims to provide an exhaust switch valve and a hydraulic retarder, so as to improve the tightness between a valve cavity of the exhaust switch valve and a piston column and realize the reliable opening and closing of the exhaust switch valve.

The technical scheme adopted by the utility model is as follows:

an exhaust switching valve comprising:

the bottom of the valve body is provided with a valve cavity with a downward opening, the top of the valve cavity is horizontally arranged, an air passage is formed in the valve body, one end of the air passage is communicated with the top of the valve cavity, and the other end of the air passage extends to the outer side face of the valve body;

the valve cover is arranged at the bottom of the valve body and seals the opening of the valve cavity, and an air hole communicated with the valve cavity is formed in the valve cover in a penetrating manner;

a piston plunger, the tip of which can seal against the roof of the cavity to block the airway from the air vent; alternatively, the top end of the piston rod is separated from the cavity top so that the air passage is communicated with the air hole.

Preferably, the piston column comprises a column body and a rubber block, the rubber block is fixedly arranged at the top end of the column body, and the rubber block can be abutted against or separated from the cavity top.

Preferably, the air passage is formed with an inlet at the center of the cavity roof; the top surface of the rubber block is convexly provided with a sealing ring surrounding the inlet, and the sealing ring can seal against the cavity top so as to seal the inlet.

As a preferred scheme, the cylinder comprises an upper platform, an upright post, a lower platform and a protruding part, wherein the upper platform and the lower platform are respectively arranged at the upper end and the lower end of the upright post, the top end of the upper platform is fixedly provided with the rubber block, the bottom end of the lower platform is provided with the protruding part, and when the rubber block is abutted against the top of the cavity, the protruding part is separated from the inner wall of the valve cover; when the bulge is abutted against the inner wall of the valve cover, the rubber block is separated from the cavity top.

Preferably, the upper platform and the lower platform are circular platforms, and the diameter of the upper platform is larger than that of the lower platform, so that the longitudinal section of the column body is in an inverted 'earth' shape.

Preferably, the valve cover is provided with a plurality of air holes distributed along the circumference, and the convex part can fall into a circle tangent to the outer edges of the plurality of air holes.

As a preferable scheme, the outer side of the bottom of the valve body is provided with a ring groove along the circumferential direction, and the side wall of the valve cover is clamped in the ring groove.

Preferably, the outer side of the valve body is provided with external threads, the outlet of the air passage on the outer side of the valve body is positioned below the external threads, and the oil pool shell of the hydrodynamic retarder is correspondingly provided with internal threads, so that the valve body can be installed on the oil pool shell in a threaded manner.

As a preferable scheme, a sealing groove is formed in the outer side of the valve body along the circumferential direction of the valve body, and a sealing ring is sleeved in the sealing groove, so that the sealing ring is clamped between the valve body and the inner wall of the oil pool shell in a sealing way; and the outlet is positioned above the sealing groove.

A hydrodynamic retarder comprises the exhaust switch valve.

The beneficial effects of the utility model are as follows:

the exhaust switch valve comprises a valve body, a valve cover and a piston column, when high-pressure gas enters the valve cavity from the air hole and pushes the piston column upwards, the top end of the piston column is sealed and abutted against the top of the cavity, and the air passage and the air hole are blocked, so that the exhaust switch valve is closed. When the high-pressure gas pressure is reduced and is smaller than the gravity of the piston column, the piston column falls down and is separated from the cavity top, so that the air passage is communicated with the air hole, the exhaust switch valve is opened, and residual air in the valve cavity is discharged through the air passage. Compared with the sealing fit of the existing sealing ball and the circular arc valve cavity, the sealing ball is horizontally arranged on the top of the valve cavity, so that the piston column cannot deviate or be eccentric, the top of the piston column is guaranteed to be tightly abutted against the top of the valve cavity, the sealing performance of the piston column and the top of the valve cavity is improved, and the exhaust switch valve can be reliably opened and closed.

When the hydraulic retarder works, high-pressure gas enters the valve cavity from the air hole and pushes the piston column upwards, so that the top end of the piston column is sealed and abutted against the top of the cavity and blocks the air passage and the air hole, and the exhaust switch valve is closed. When the high-pressure gas pressure is reduced and is smaller than the gravity of the piston column, the piston column falls down and is separated from the cavity top, so that the air passage is communicated with the air hole, the exhaust switch valve is opened, and residual air in the valve cavity is discharged through the air passage. The exhaust switch valve can be reliably opened and closed, so that the residual pressure in the hydraulic retarder is timely released, and the braking response and the exiting performance of the hydraulic retarder are improved.

Drawings

FIG. 1 is a cross-sectional view of an exhaust switching valve provided by an embodiment of the present utility model;

fig. 2 is a schematic structural view of a piston rod according to an embodiment of the present utility model.

The parts in the figures are named and numbered as follows:

1. a valve body; 11. a valve cavity; 111. a cavity roof; 12. an airway; 121. an inlet; 122. an outlet; 13. a ring groove; 14. an external thread; 15. sealing grooves; 2. a valve cover; 21. air holes;

3. a piston column; 31. a column; 311. a top platform; 312. a column; 313. a lower platform; 314. a boss; 32. a rubber block; 321. a seal ring; 4. and (3) sealing rings.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

The embodiment provides a hydraulic retarder, which comprises a working cavity consisting of a rotor and a stator, an oil pool shell and a heat exchanger. In order to improve the braking response and the exit performance of the hydraulic retarder, an exhaust switch valve is arranged on an oil pool shell of the hydraulic retarder so as to release the residual pressure in the hydraulic retarder.

The valve cavity of the existing exhaust switch valve is arc-shaped, the inner piston is a sealing ball, and the valve cavity is opened and closed through the sealing ball. The processing difficulty of the sealing ball is high, the eccentric and other conditions are easy to occur, the sealing ball cannot be tightly attached to the arc-shaped valve cavity, so that air leakage is caused, and the sealing performance of the exhaust switch valve is reduced.

In order to solve the above-mentioned problems, as shown in fig. 1, the embodiment further provides an exhaust switch valve, which specifically includes a valve body 1, a valve cover 2 and a piston column 3, wherein the bottom of the valve body 1 is provided with a valve cavity 11 with a downward opening, a cavity top 111 of the valve cavity 11 is horizontally arranged, an air passage 12 is formed in the valve body 1, one end of the air passage 12 is communicated with the cavity top 111 of the valve cavity 11, and the other end of the air passage 12 extends to the outer side surface of the valve body 1. The valve cover 2 is arranged at the bottom of the valve body 1 in a covering way and seals the opening of the valve cavity 11, and an air hole 21 communicated with the valve cavity 11 is formed in the valve cover 2 in a penetrating way. The top end of the piston rod 3 can be tightly abutted against the cavity top 111 to block the air passage 12 and the air hole 21; alternatively, the top end of the piston rod 3 is separated from the chamber top 111 so that the air passage 12 communicates with the air hole 21.

When the hydraulic retarder works, high-pressure gas in the oil pool shell enters the valve cavity 11 from the air hole 21 and extrudes the piston column 3 upwards, so that the top end of the piston column 3 is sealed and abutted against the cavity top 111 and the air passage 12 and the air hole 21 are blocked, the exhaust switch valve is closed, and the air pressure in the retarder is ensured to be stable. When the hydraulic retarder stops working, the pressure of the high-pressure gas drops and is smaller than the self gravity of the piston column 3, the piston column 3 drops and breaks away from the cavity top 111, so that the air passage 12 is communicated with the air hole 21, the exhaust switch valve is opened, and the residual air in the valve cavity 11 is discharged through the air passage 12.

The cavity top 111 of the valve cavity 11 of the exhaust switch valve is horizontally arranged, so that the problems of offset or eccentricity and the like of the piston column 3 cannot occur, the top of the piston column 3 is guaranteed to be tightly abutted against the cavity top 111, the tightness between the piston column 3 and the cavity top 111 is improved, and the exhaust switch valve can be reliably opened and closed. The hydraulic retarder can timely release the residual pressure (namely residual air) in the hydraulic retarder through the exhaust switch valve, and the braking response and the exiting performance of the hydraulic retarder are improved.

As shown in fig. 1, the outer side of the valve body 1 is provided with an external thread 14, and the oil sump housing of the hydrodynamic retarder is correspondingly provided with an internal thread, so that the valve body 1 can be mounted on the oil sump housing in a threaded manner. The outside of valve body 1 has offered seal groove 15 along its circumference, has cup jointed sealing washer 4 in the seal groove 15 to make sealing washer 4 seal clamp locate between the inner wall of valve body 1 and oil sump casing. The valve body 1 is screwed and installed on the oil sump shell through the external threads 14, so that the installation operation of the valve body 1 is simple and convenient, and meanwhile, the stable installation of the valve body 1 is realized. The sealing ring 4 can ensure that the oil pool shell has good sealing, and external air is prevented from entering the oil pool shell.

Further, when the exhaust switch valve is screwed and installed on the oil sump housing, an annular air storage cavity is formed between part of the outer side surface of the valve body 1 and part of the inner wall of the oil sump housing, and good sealing of the air storage cavity can be achieved through the matching of the external threads 14 of the valve body 1 and the internal threads of the oil sump housing and the sealing ring 4 in the sealing groove 15. The air passage 12 is formed with an inlet 121 at the center of the chamber top 111, the air passage 12 is formed with an outlet 122 at the outer side surface of the valve body 1, the outlet 122 is positioned below the external screw thread 14, and the outlet 122 is positioned above the seal groove 15 and is communicated with the air storage chamber. The oil tank shell is also provided with a discharge channel communicated with the gas storage cavity. When the exhaust switching valve is opened, high-pressure gas in the valve chamber 11 enters the air passage 12 through the inlet 121 of the chamber top 111, enters the gas storage chamber from the outlet 122, and is discharged to the outside through the exhaust passage, thereby realizing the release of residual pressure inside the oil sump housing.

As shown in fig. 1 and 2, the piston column 3 includes a column body 31 and a rubber block 32, the top end of the column body 31 is fixedly provided with the rubber block 32, and the rubber block 32 can be abutted against or separated from the cavity top 111. The rubber block 32 has better elasticity, and when the high-pressure gas pushes the rubber block 32 to press against the cavity top 111, the rubber block 32 can be compressed and deformed so as to improve the tightness between the rubber block 32 and the cavity top 111. Moreover, when the surface of the cavity top 111 is rough due to the reasons of processing precision and the like, the rubber block 32 can also abut against the uneven surface of the cavity top 111, so that a gap between the rubber block 32 and the cavity top 111 is avoided, and the sealing effect is further improved.

Further, as shown in fig. 2, the top surface of the rubber block 32 is convexly provided with a sealing ring 321 surrounding the inlet 121, and the sealing ring 321 seals against the cavity top 111 to block the inlet 121. The sealing ring 321 is a 360-degree ring body, so that the rubber block 32 is tightly pressed on the cavity top 111 through the sealing ring 321, and the sealing effect is improved.

As shown in fig. 1 and 2, the column 31 includes an upper platform 311, a column 312, a lower platform 313 and a protrusion 314, the upper platform 311 and the lower platform 313 are respectively disposed at the upper and lower ends of the column 312, the top of the upper platform 311 is fixedly provided with a rubber block 32, and the bottom of the lower platform 313 is provided with the protrusion 314. When the rubber block 32 abuts against the cavity top 111, the protruding portion 314 is separated from the inner wall of the valve cover 2. When the boss 314 abuts against the inner wall of the valve cover 2, the rubber block 32 is separated from the cavity top 111.

Specifically, when the hydrodynamic retarder is in operation, high-pressure gas in the oil pool housing enters the valve cavity 11 from the air hole 21, and at this time, the pressure of the high-pressure gas is greater than the gravity of the piston column 3, so as to push the piston column 3 to rise and make the sealing ring 321 abut against the cavity top 111, the boss 314 is separated from the inner wall of the valve cover 2, and the exhaust switch valve is closed. When the hydraulic retarder stops working, the pressure of high-pressure gas in the valve cavity 11 is gradually reduced, when the pressure of the high-pressure gas is reduced to be smaller than the gravity of the piston column 3, the piston column 3 descends and resets, the protruding part 314 abuts against the inner wall of the valve cover 2, the rubber block 32 is separated from the cavity top 111, the exhaust switch valve is opened, and residual gas is discharged through the air channel 12.

Further, the upper platform 311 and the lower platform 313 are both circular platforms, and the diameter of the upper platform 311 is larger than that of the lower platform 313, so that the longitudinal section of the column 31 is in an inverted 'earth' shape. The soil-shaped column body 31 is simple in structure, and meanwhile, the upper platform 311 and the lower platform 313 can be simultaneously subjected to the thrust of high-pressure gas, so that the contact area of the piston column 3 and the high-pressure gas is increased. In addition, the area of the lower platform 313 is smaller than that of the upper platform 311 to ensure that the high-pressure gas in the valve chamber 11 can smoothly enter the air passage 12.

As shown in fig. 1, the outer side of the bottom of the valve body 1 is provided with a ring groove 13 along the circumferential direction, and the side wall of the valve cover 2 is clamped in the ring groove 13. The valve cover 2 is provided with a plurality of circumferentially distributed air holes 21, so that high-pressure air of the oil sump shell can quickly enter the valve cavity 11 and tightly prop against the piston column 3, and the air inlet efficiency of the high-pressure air is improved.

Specifically, the valve cover 2 can be in threaded connection with the outer side of the bottom of the valve body 1, so that the dismounting efficiency of the valve cover 2 and the valve body 1 is improved. The longitudinal section of the valve cover 2 is of a U-shaped hollow cylindrical structure with an open top end, and four air holes 21 are formed in the bottom wall of the valve cover 2 around the center of the bottom wall. In other embodiments, the number and size of the air holes 21 may be flexibly adjusted according to the air intake requirement, which is not particularly limited herein.

When the exhaust switch valve is opened, the piston column 3 abuts against the center of the inner wall of the valve cover 2 under the action of gravity, and the protruding portion 314 falls into a circle tangent to the outer edges of the air holes 21, that is, the protruding portion 314 falls into an area surrounded by the air holes 21 and does not shield the air holes 21, so that high-pressure air is prevented from entering the valve cavity 11 smoothly.

The above embodiments merely illustrate the basic principle and features of the present utility model, and the present utility model is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. An exhaust switching valve, characterized by comprising:

the valve comprises a valve body (1), wherein a valve cavity (11) with a downward opening is arranged at the bottom of the valve body (1), a cavity top (111) of the valve cavity (11) is horizontally arranged, an air passage (12) is formed in the valve body (1), one end of the air passage (12) is communicated with the cavity top (111) of the valve cavity (11), and the other end of the air passage (12) extends to the outer side face of the valve body (1);

the valve cover (2) is arranged at the bottom of the valve body (1) in a covering mode and seals the opening of the valve cavity (11), and an air hole (21) communicated with the valve cavity (11) is formed in the valve cover (2) in a penetrating mode;

a piston column (3), wherein the top end of the piston column (3) can be tightly abutted against the cavity top (111) so as to block the air passage (12) and the air hole (21); alternatively, the top end of the piston rod (3) is separated from the cavity top (111) so that the air passage (12) is communicated with the air hole (21).

2. The exhaust switch valve according to claim 1, characterized in that the piston column (3) comprises a column body (31) and a rubber block (32), the rubber block (32) is fixedly arranged at the top end of the column body (31), and the rubber block (32) can be abutted against or separated from the cavity top (111).

3. The exhaust switching valve according to claim 2, characterized in that the air passage (12) is formed with an inlet (121) in the center of the chamber top (111); the top surface of the rubber block (32) is convexly provided with a sealing ring (321) surrounding the inlet (121), and the sealing ring (321) can be tightly abutted against the cavity top (111) so as to seal the inlet (121).

4. The exhaust switch valve according to claim 2, wherein the column (31) comprises an upper platform (311), a column (312), a lower platform (313) and a protruding portion (314), the upper platform (311) and the lower platform (313) are respectively arranged at the upper end and the lower end of the column (312), the rubber block (32) is fixedly arranged at the top end of the upper platform (311), the protruding portion (314) is arranged at the bottom end of the lower platform (313), and when the rubber block (32) is abutted against the cavity top (111), the protruding portion (314) is separated from the inner wall of the valve cover (2); when the bulge (314) is abutted against the inner wall of the valve cover (2), the rubber block (32) is separated from the cavity top (111).

5. The exhaust switching valve according to claim 4, wherein the upper and lower platforms (311, 313) are circular platforms, and the diameter of the upper platform (311) is larger than the diameter of the lower platform (313) so that the longitudinal section of the column (31) is in an inverted "earth" shape.

6. The exhaust switching valve according to claim 4, wherein the valve cover (2) has a plurality of the air holes (21) distributed circumferentially thereon, and the protruding portion (314) is capable of falling into a circle tangential to the outer edges of the plurality of the air holes (21).

7. The exhaust switch valve according to any one of claims 1 to 6, wherein an annular groove (13) is formed in the outer side of the bottom of the valve body (1) along the circumferential direction thereof, and the side wall of the valve cover (2) is clamped in the annular groove (13).

8. The exhaust gas switching valve according to any of claims 1-6, characterized in that the outer side of the valve body (1) is provided with an external thread (14), the outlet (122) of the air channel (12) at the outer side of the valve body (1) is located below the external thread (14), and the oil sump housing of the hydrodynamic retarder is correspondingly provided with an internal thread, so that the valve body (1) can be mounted on the oil sump housing in a threaded manner.

9. The exhaust switch valve according to claim 8, wherein a sealing groove (15) is formed in the outer side of the valve body (1) along the circumferential direction of the valve body, and a sealing ring (4) is sleeved in the sealing groove (15), so that the sealing ring (4) is clamped between the valve body (1) and the inner wall of the oil pool shell in a sealing manner; the outlet (122) is located above the seal groove (15).

10. A hydrodynamic retarder comprising an exhaust gas switching valve according to any of claims 1-9.