CN217683536U

CN217683536U - Sealing structure between valve cover and valve rod of hydraulic control valve

Info

Publication number: CN217683536U
Application number: CN202221248774.2U
Authority: CN
Inventors: 袁帅; 姚伯华; 罗世材; 汤鸿
Original assignee: Guizhou Qingshuijiang Hydropower Co ltd
Current assignee: Guizhou Qingshuijiang Hydropower Co ltd
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-10-28
Anticipated expiration: 2032-05-24

Abstract

The sealing structure between the valve cover and the valve rod of the hydraulic control valve comprises a valve cover B, a valve rod, a Y-shaped sealing ring and a guide ring; the center of the valve cover B is provided with a shaft hole which penetrates through the end face of the outer side and the end face of the inner side, the wall surface of the shaft hole close to one end of the end face of the outer side is provided with an annular sealing ring groove, and the wall surface of the shaft hole close to one end of the end face of the inner side is provided with an annular guide ring groove; the Y-shaped sealing ring and the guide ring are respectively arranged in the sealing ring groove and the guide ring groove and are in close contact with the outer circular surface of the valve rod. The utility model discloses set up the guide ring between valve gap B and valve rod, increased the anti eccentric ability of valve rod through the guide ring, and then reduced and leaded to the excessive wearing and tearing to Y type sealing washer because of the valve rod unbalance loading, indirectly prolonged the life of Y type sealing washer. The silt in the water is isolated through the guide ring, so that the abrasion of the silt in the water to the Y-shaped sealing ring is eliminated, and the service life of the Y-shaped sealing ring is indirectly prolonged.

Description

Sealing structure between valve cover and valve rod of hydraulic control valve

Technical Field

The utility model relates to a valve seal structure, especially a seal structure between hydraulic control valve gap and valve rod.

Background

The hydraulic control valve is one of the most common valves in daily life, is a control valve driven by hydraulic power and a diaphragm, is widely applied to building pipelines, fire-fighting facilities, heating ventilation air conditioners, irrigation systems and water supply systems in the water and electricity industry, and is generally used for reducing pressure, holding pressure, relieving pressure, adjusting flow, preventing a water hammer in advance and controlling water level.

The structure of a conventional hydraulic control valve is shown in fig. 5, and comprises a valve body 1, a valve cover A2, a valve rod 3, a valve flap assembly 4, a diaphragm assembly 5 and a pipeline assembly. The inside of the valve body 1 is provided with an inner cavity for water circulation, the outer wall of the valve body 1 is provided with a water inlet 11, a water outlet 12, a valve cover mounting hole 13, a lower water outlet 141, an upper water inlet 142, a lower water inlet 151 and an upper water outlet 152 which are communicated with the inner cavity, the inner cavity of the valve body 1 is internally provided with a communication port 16 and a valve rod mounting hole from bottom to top respectively, and the communication port 16 and the valve rod mounting hole divide the inner cavity of the valve body 1 into a water inlet cavity 17, a water outlet cavity 18 and an upper cavity 19 together. The water inlet cavity 17 is positioned between the water inlet 11 and the communication port 16 in the inner cavity of the valve body 1, the water discharge cavity 18 is positioned between the water discharge port 12, the communication port 16 and the valve rod mounting hole in the inner cavity of the valve body 1, and the upper cavity 19 is positioned between the valve rod mounting hole and the valve cover mounting hole 13 in the inner cavity of the valve body 1. The lower drain port 141 communicates with the water inlet chamber 17, the upper water inlet 142 communicates with the upper chamber 19, the lower water inlet 151 communicates with the drain chamber 18, and the upper drain port 152 communicates with the upper chamber 19. The valve cover A2 is fixedly arranged on the valve cover mounting hole 13, and a shaft hole is formed in the center of the valve cover A2. The valve rod 3 is slidably mounted in the valve rod mounting hole through a sealing ring and a shaft sleeve, the lower end of the valve rod extends out of the lower port of the valve rod mounting hole, then sequentially penetrates through the drainage cavity 18 and the communication port 16 and extends into the water inlet cavity 17, and the upper end of the valve rod extends out of the upper port of the valve rod mounting hole, then sequentially penetrates through the upper cavity 19 and the shaft hole and extends out of the valve body 1. The valve assembly 4 and the diaphragm assembly 5 are fixedly mounted on the valve rod 3 from bottom to top and are respectively positioned in the drainage cavity 18 and the upper cavity 19. The pipeline assembly comprises an electromagnetic pilot valve 61, a pipeline A62, a pipeline B63, a pipeline C64 and a pipeline D65, one end of the pipeline A62, one end of the pipeline B63, one end of the pipeline C64 and one end of the pipeline D65 are respectively communicated with the electromagnetic pilot valve 61, and the other end of the pipeline A62, the other end of the pipeline B63, one end of the pipeline C64 and the other end of the pipeline D65 are respectively communicated with a lower water outlet 141, an upper water inlet 142, an upper cavity 19 and a water drainage cavity 18.

The hydraulic control valve works according to the following principle: when water outside the valve body 1 enters the water inlet cavity 17 through the water inlet 11, the water flows into the pipeline A62 through the lower water outlet 141, when the water pressure in the pipeline A62 is higher than the set pressure, the electromagnetic pilot valve 61 operates to communicate the pipeline C64 with the pipeline C65, the water in the upper cavity 19 is discharged to the water discharge cavity 18 through the upper water outlet 152, the pipeline C64, the electromagnetic pilot valve 61 and the pipeline D65, and finally discharged to the outside of the valve body 1 through the water outlet 12, so that the hydraulic control valve is opened. When the hydraulic electromagnetic valve needs to be closed, a reset signal is artificially given to the electromagnetic pilot valve 61, so that the pipeline A62 is communicated with the pipeline B63, and water in the water inlet cavity 17 immediately enters the upper cavity 19 through the lower water outlet 141, the pipeline A62, the electromagnetic pilot valve 61, the pipeline B63 and the upper water inlet 142, so that the hydraulic control valve is closed.

In the process of frequently filling water and draining water in the upper cavity, the O-shaped sealing ring is arranged between the valve cover A and the valve rod, so that water cannot leak from the space between the valve cover A and the valve rod. When the hydraulic control valve is applied to a water supply system in the hydropower industry, the sealing structure has the following defects: 1. because the hydraulic control valve directly takes river water as pressure control water of the upper cavity, silt in the water can be brought into the upper cavity, and the O-shaped sealing ring is easily abraded by the silt in the water. In the process of frequently opening and closing the hydraulic control valve for a long time, the abrasion phenomenon is more serious. 2. Although the hydraulic control valve has the function of eliminating water hammer to a certain extent, as the hydraulic control valve is frequently opened and closed for a long time and the water taking aperture is large, a certain amount of unbalance loading can inevitably occur in the rod section at the lower part of the valve rod, and then the rod section at the upper part of the valve rod is driven to unbalance loading, so that the abrasion of the O-shaped sealing ring is further aggravated. 3. The common sealing ring is made of nitrile rubber, has certain wear resistance, but has low elasticity, and is easy to generate permanent deformation in a long-term compressive sealing process to cause sealing failure.

The hydraulic control valve is used as a key valve group of a water supply system in the water and electricity industry, the safe and stable operation of the water turbine generator set is directly influenced, the sealing performance of the upper cavity of the valve body of the hydraulic control valve is guaranteed, and the hydraulic control valve has great safety benefits.

Disclosure of Invention

The utility model aims at overcoming the not enough of prior art, and provide a seal structure between hydraulic control valve gap and valve rod, it has solved when hydraulic control valve is applied to water and electricity trade water supply system, and seal structure life between valve gap and the valve rod is short, very easily the wearing and tearing inefficacy scheduling problem, and then leads to hydraulic control valve inner chamber pressure shakiness, the poor problem of whole hydraulic control valve reliability.

The technical scheme of the utility model is that: the sealing structure between the valve cover and the valve rod of the hydraulic control valve comprises a valve cover B, a valve rod, a Y-shaped sealing ring and a guide ring; the two ends of the valve cover B are respectively provided with an outer end face and an inner end face, the center of the valve cover B is provided with a shaft hole which penetrates through the outer end face and the inner end face, the wall surface of the shaft hole close to one end of the outer end face is provided with an annular sealing ring groove, and the wall surface of the shaft hole close to one end of the inner end face is provided with an annular guide ring groove; the valve rod is movably arranged in the shaft hole of the valve cover B, and two ends of the valve rod extend out of two ends of the shaft hole; the Y-shaped sealing ring and the guide ring are respectively arranged in the sealing ring groove and the guide ring groove and are in close contact with the outer circular surface of the valve rod.

The utility model discloses further technical scheme is: the inner diameter of the Y-shaped sealing ring is a, the diameter of the valve rod is b, and b/a =1.01.

The utility model discloses still further technical scheme is: the outer diameter of the guide ring is c, the inner diameter of the guide ring groove is d, and c/d =1.

The utility model discloses a further technical scheme is: the guide ring is provided with an oblique notch inclined by 30 degrees relative to the axial direction, and when the guide ring is not subjected to external force, the tangent planes at two sides of the oblique notch are mutually attached.

The utility model discloses a further technical scheme is: the Y-shaped sealing ring is made of soft polyurethane, and the guide ring is made of hard polyurethane.

Compared with the prior art, the utility model have following advantage:

1. on one hand, the guide ring is arranged between the valve cover B and the valve rod, and the eccentricity resistance of the valve rod is improved through the guide ring, so that excessive abrasion of the Y-shaped sealing ring caused by unbalance loading of the valve rod is reduced, and the service life of the Y-shaped sealing ring is indirectly prolonged; on the other hand, the Y-shaped sealing ring is used for replacing the traditional O-shaped sealing ring, the sealing performance is improved, and compared with the O-shaped sealing ring, the Y-shaped sealing ring has the characteristics of wear resistance, small friction force, automatic wear compensation and capability of increasing the sealing performance according to the increase of working pressure.

2. The Y-shaped sealing ring is made of soft polyurethane, has good rebound resilience and mechanical property, and is not easy to lose efficacy due to permanent deformation in a long-term compressive sealing process.

3. The guide ring is made of hard polyurethane, has certain strength, hardness and abrasion resistance, and can play a better role in guiding, rectifying and preventing sediment.

4. The guide ring is provided with an oblique cut (inclined by 30 degrees relative to the axial direction), so that the guide ring is convenient to mount on one hand, and has better water seepage prevention effect compared with a straight cut (a cut parallel to the axial direction) on the other hand.

The invention is further described below with reference to the figures and examples.

Drawings

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

FIG. 2 is a perspective, partially sectioned view of the valve cover;

FIG. 3 is a block diagram of a guide ring;

FIG. 4 is a bottom view of FIG. 3;

fig. 5 is a schematic structural view of a conventional hydraulic control valve.

Detailed Description

Example 1:

as shown in fig. 1-4, the sealing structure between the valve cover and the valve rod of the hydraulic control valve comprises a valve cover B7, a valve rod, a Y-shaped sealing ring 8 and a guide ring 9.

The two ends of the valve cover B7 are respectively provided with an outer end face and an inner end face, the center of the valve cover B7 is provided with a shaft hole penetrating through the outer end face and the inner end face, the wall surface of the shaft hole close to one end of the outer end face is provided with an annular sealing ring groove 71, and the wall surface of the shaft hole close to one end of the inner end face is provided with an annular guide ring groove 72. The valve rod is movably arranged in the shaft hole of the valve cover B7, and two ends of the valve rod extend out of two ends of the shaft hole. The Y-shaped seal ring 8 and the guide ring 9 are respectively installed in the seal ring groove 71 and the guide ring groove 72, and are in close contact with the outer circumferential surface of the stem.

Preferably, the Y-shaped seal ring has an inner diameter of a, the valve stem has a diameter of b, and b/a =1.01.

Preferably, the guide ring has an outer diameter c and the guide ring groove has an inner diameter d, c/d =1.

Preferably, the guide ring 9 is provided with a chamfer 91 inclined by 30 ° with respect to the axial direction, and when the guide ring 91 is not subjected to an external force, the cut surfaces on both sides of the chamfer 91 are attached to each other.

Brief description the working principle of the utility model: set up guide ring 9 between valve gap B7 and valve rod, increased the anti eccentric ability of valve rod through guide ring 9, and then reduced and led to the excessive wearing and tearing of Y type sealing washer 8 because of the valve rod unbalance loading, indirectly prolonged the life of Y type sealing washer 8. The silt of 9 isolated aquatic of guide rings has then reduced the wearing and tearing of aquatic silt to Y type sealing washer 8, has prolonged Y type sealing washer 8's life indirectly. The Y-shaped sealing ring 8 is used for replacing a traditional O-shaped sealing ring, the sealing performance is improved, and compared with the O-shaped sealing ring, the Y-shaped sealing ring 8 has the characteristics of wear resistance, small friction force, automatic wear compensation and capability of increasing the sealing performance according to the increase of working pressure.

Claims

1. Seal structure between water conservancy control valve gap and valve rod, characterized by: comprises a valve cover B, a valve rod, a Y-shaped sealing ring and a guide ring; the two ends of the valve cover B are respectively provided with an outer end face and an inner end face, the center of the valve cover B is provided with a shaft hole which penetrates through the outer end face and the inner end face, the wall surface of the shaft hole close to one end of the outer end face is provided with an annular sealing ring groove, and the wall surface of the shaft hole close to one end of the inner end face is provided with an annular guide ring groove; the valve rod is movably arranged in the shaft hole of the valve cover B, and two ends of the valve rod extend out of two ends of the shaft hole; the Y-shaped sealing ring and the guide ring are respectively arranged in the sealing ring groove and the guide ring groove and are in close contact with the outer circular surface of the valve rod.

2. The seal structure between the valve cover and the valve rod of the hydraulic control valve as claimed in claim 1, wherein: the inner diameter of the Y-shaped sealing ring is a, the diameter of the valve rod is b, and b/a =1.05.

3. The seal structure between the valve cover and the valve rod of the hydraulic control valve as claimed in claim 2, wherein: the outer diameter of the guide ring is c, the inner diameter of the guide ring groove is d, and c/d =1.

4. The seal structure between the valve cover and the valve rod of the hydraulic control valve as claimed in claim 3, wherein: the guide ring is provided with an oblique notch inclined by 30 degrees relative to the axial direction, and when the guide ring is not subjected to external force, the tangent planes at two sides of the oblique notch are mutually attached.