High-pressure stop valve

Abstract

The utility model relates to the technical field of stop valves, and discloses a high-pressure stop valve, which comprises a valve body, a valve rod, a valve clack, a valve cover and a valve seat, an inlet flow channel and an outlet flow channel are arranged at two ends of the valve body, an overflow port communicated with the inlet flow channel and the outlet flow channel is arranged in the valve body, the valve cover is arranged at the valve neck end of the valve body, and the valve rod is arranged on the valve seat. A valve hole is formed in the middle of the valve cover, the valve rod penetrates through the valve hole, and the bottom end of the valve rod extends into the outlet flow channel to be in linkage connection with the valve clack, and is characterized in that a buffer plate is fixedly arranged in the inlet flow channel, a plurality of buffer holes are formed in the buffer plate in a penetrating mode, and a rubber sleeve is fixedly arranged on the surface of the buffer plate in a sleeving mode; and the edge of the rubber sleeve is in contact with the inner wall of the inlet runner. The high-pressure stop valve solves the problem that when a high-pressure stop valve in the prior art is rapidly closed, a water hammer effect can be generated, and a pipeline and a valve are unfavorable.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a high-pressure stop valve. Background Art

[0002] The opening and closing parts of the high-pressure globe valve are plug-shaped discs, with a flat or conical sealing surface. The disc moves linearly along the center line of the fluid. The movement of the valve stem can be either a lifting stem type (the stem rises and falls, but the handwheel does not), or a lifting and rotating stem type (the handwheel rotates and rises together with the stem, and the nut is located on the valve body). The globe valve is only suitable for full opening and full closing, and adjustment and throttling are not allowed.

[0003] The existing Chinese utility model patent application number is 202321738944.X, which discloses a high-pressure stop valve, including a valve body, connecting flanges located at both ends of the valve body for connecting to an external pipeline, the valve body is provided with a valve stem at the inner position to control the flow switch, the valve stem controls the internal switch of the valve body through a handle located at the upper end position, the valve body is fixed with an internal buffer plate at the inner position, the internal buffer plate is provided with through holes at the upper and lower sides of the front end, the internal buffer plate is provided with an intermediate mesh at the middle position of the front end, and the internal buffer plate is provided with a baffle at the upper and lower positions of the inner side; wherein, the baffle is sleeved with the internal buffer plate through a sliding column distributed at the outer wall position, the sliding column is sleeved with a stainless steel spring at the outer wall position, and the left and right ends of the stainless steel spring are respectively fixed to the sliding column and the internal buffer plate. The principle is: the flow inside the valve body gradually increases as the handle is turned. The flow generated when the handle is first turned first flows through the inside of the valve body from the middle mesh. After the valve body is fully opened, the flow increases, pushing the baffle to move, and the flow flows through the middle mesh and through the hole, thereby reducing the impact of excessive flow on the pipe on the other side of the valve body.

[0004] The prior art has the following technical defects: although the above-mentioned high-pressure stop valve can reduce the impact on the outlet pipeline, when the stop valve is quickly closed, the fluid stops flowing, and the original kinetic energy of the flow is converted into pressure energy, causing the pressure in the inlet pipeline to rise sharply, which will cause one or more pressure waves to propagate to the fluid, causing impact and oscillation, which is the "water hammer effect" in hydraulics. At this time, the presence of the baffle will further aggravate the pressure wave, which will have an adverse effect on the pipeline and valve. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a high-pressure stop valve to solve the problem that the high-pressure stop valve in the prior art will produce a water hammer effect when it is quickly closed, which is detrimental to pipelines and valves.

[0006] The utility model solves the above technical problems through the following technical means: a high-pressure stop valve, comprising a valve body, a valve stem, a valve disc, a valve cover and a valve seat, wherein an inlet flow channel and an outlet flow channel are arranged at both ends of the valve body, a flow port connecting the inlet flow channel and the outlet flow channel is arranged in the valve body, the valve cover is installed on the valve neck end of the valve body, a valve hole is opened in the middle of the valve cover, the valve stem passes through the valve hole and the bottom end of the valve stem extends into the outlet flow channel and is linked to the valve disc, a buffer plate is fixedly provided in the inlet flow channel, a plurality of buffer holes are penetrated on the buffer plate, a rubber sleeve is fixedly provided on the surface of the buffer plate, and the edge of the rubber sleeve contacts the inner wall of the inlet flow channel.

[0007] Furthermore, an axial stepped hole is provided in the inlet flow channel, the end of the axial stepped hole close to the valve disc is a large diameter section, and the end away from the valve disc is a small diameter section, and a mounting ring is provided at the hole shoulder of the axial stepped hole, and the size of the mounting ring gradually decreases from the small diameter section to the large diameter section of the axial step hole, and the buffer plate is located in the large diameter section of the axial step hole.

[0008] Furthermore, the mounting ring is evenly provided with a plurality of arc-shaped guide rods along the circumference of the mounting ring, one end of the arc-shaped guide rod is fixedly connected to one end of the mounting ring close to the large diameter section of the axial stepped hole, and the other end passes through the edge of the rubber sleeve to form a suspended end, and the rubber sleeve is slidably matched with the arc-shaped guide rod.

[0009] Furthermore, a spring is sleeved on the surface of the arc-shaped guide rod, one end of the spring is fixedly connected to the mounting ring, and the other end of the spring is fixedly connected to the rubber sleeve.

[0010] Furthermore, a limiting ring is provided at the suspended end of the arc-shaped guide rod.

[0011] Furthermore, the size of the buffer hole gradually decreases from the inlet flow channel to the outlet flow channel.

[0012] The beneficial effects of the utility model are:

[0013] 1. The flow rate of the fluid inside the valve body gradually increases as the handle is turned. When the handle begins to be turned, the flow rate generated by the fluid first flows through the inside of the valve body from the buffer hole. After the valve body is fully opened, the flow rate reaches the maximum. The pressure of the fluid causes the edge of the rubber sleeve to bend to the other side. At this time, the fluid can flow through. The fluid circulates from the buffer hole and the edge of the rubber sleeve, which can reduce the impact of excessive fluid flow on the pipeline on the other side of the valve body.

[0014] 2. The buffer holes on the buffer plate can accelerate the fluid, making the fluid flow in the valve body faster. At the same time, when the fluid flows in the opposite direction, the buffer holes can slow down the speed of the fluid, thereby buffering the water hammer effect and ensuring that the stop valve is safer to use.

[0015] 3. When the fluid flows in the reverse direction, it will also impact the rubber sleeve. At this time, the rubber sleeve bends in the reverse direction. Under the action of the elasticity of the rubber sleeve itself, part of the kinetic energy of the fluid can be converted into internal energy for consumption, further achieving the deceleration of the fluid and increasing the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention can be further described by the non-limiting embodiments given in the accompanying drawings;

[0017] Figure 1 The utility model is a structural schematic diagram of a high-pressure stop valve.

[0018] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0019] Figure 3 It is a schematic diagram of the installation structure of the buffer plate in the utility model.

[0020] Figure 4 yes Figure 3 Schematic diagram of the structure from another perspective.

[0021] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure at point B in the middle.

[0022] In the above drawings: 1. valve body; 2. valve cover; 3. valve stem; 4. valve disc; 5. valve seat; 6. connecting flange; 7. inlet flow channel; 8. outlet flow channel; 9. buffer plate; 10. cross bracket; 11. buffer hole; 12. rubber sleeve; 13. mounting ring; 14. arc guide rod; 15. spring; 16. limit ring; 17. handwheel. DETAILED DESCRIPTION

[0023] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are only for exemplary descriptions, and they are only schematic diagrams, not physical diagrams, and cannot be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the figures may be omitted.

[0024] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the figure. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. In the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] like Figure 1-5 As shown, an embodiment of the utility model proposes a high-pressure stop valve, including a valve body 1, a valve stem 3, a valve disc 4, a valve cover 2 and a valve seat 5. The valve body 1 is provided with an inlet flow channel 7 and an outlet flow channel 8 from left to right, and a flow port connecting the inlet flow channel 7 and the outlet flow channel 8 is provided between the inlet flow channel 7 and the outlet flow channel 8. The valve cover 2 is fixedly mounted on the upper end of the valve body 1 by bolts, and a valve hole is opened in the middle of the valve cover 2. The valve stem 3 passes through the valve hole and the bottom end of the valve stem 3 is linked to the valve disc 4. The outer end of the valve stem 3 is connected to a handwheel 17, and both ends of the valve body 1 are fixedly connected with a connecting flange 6. In this embodiment, the valve body 1, the valve stem 3, the valve disc 4, the valve cover 2, the valve seat 5 and the handwheel 17 can adopt the high-pressure stop valve in the prior art, so they are not described in detail.

[0026] An axial stepped hole is provided in the inlet flow channel 7, the end of the axial stepped hole close to the valve disc 4 is a large diameter section, and the end away from the valve disc 4 is a small diameter section. A mounting ring 13 is fixedly provided at the hole shoulder of the axial stepped hole, and the size of the mounting ring 13 gradually decreases from the small diameter section to the large diameter section of the axial step hole. In this embodiment, the left end of the mounting ring 13 is integrally formed with the inner wall of the small diameter section at the hole shoulder of the axial step hole, so that the reliability of the mounting ring 13 is high, and the right end of the mounting ring 13 extends toward the large diameter section of the axial step hole, so that the mounting ring 13 has no effect on the forward flowing fluid in the inlet flow channel 7, and has a certain blocking effect on the reverse flowing fluid.

[0027] A buffer plate 9 is fixedly provided in the large diameter section of the inlet flow channel 7. A plurality of buffer holes 11 are penetrated through the buffer plate 9. The size of the buffer holes 11 gradually decreases from the inlet flow channel 7 to the outlet flow channel 8. A disc-shaped rubber sleeve 12 is fixedly provided on the surface of the buffer plate 9. The edge of the rubber sleeve 12 contacts the inner wall of the inlet flow channel 7.

[0028] In this embodiment, the buffer hole 11 can accelerate the fluid, making the fluid flow in the valve body 1 faster. At the same time, when the fluid flows in the opposite direction, the buffer hole 11 can slow down the speed of the fluid, thereby buffering the water hammer effect and ensuring that the stop valve is safer to use. The buffer plate 9 is cylindrical in shape and has a certain lateral width. A cross bracket 10 is fixed to the right end face of the buffer plate 9. The four ends of the cross bracket 10 are fixedly connected to the inner wall of the inlet flow channel 7. The left end face of the buffer plate 9 is close to the mounting ring 13. The rubber sleeve 12 is fixedly mounted on the left side of the buffer plate 9. With such a structural design, the rubber sleeve 12 does not interfere with the cross bracket 10 when it is bent. At the same time, the cross bracket 10 can provide stable support for the buffer plate 9.

[0029] The mounting ring 13 is evenly provided with four arc-shaped guide rods 14 along the circumference of the mounting ring 13. The left end of the arc-shaped guide rod 14 is fixedly connected to the right end of the mounting ring 13. The right end of the arc-shaped guide rod 14 passes through the edge of the rubber sleeve 12 to form a suspended end. The rubber sleeve 12 and the arc-shaped guide rod 14 are slidably matched. A spring 15 is sleeved on the surface of the arc-shaped guide rod 14. One end of the spring 15 is fixedly connected to the mounting ring 13, and the other end is fixedly connected to the rubber sleeve 12. A limit ring 16 is provided at the suspended end of the arc-shaped guide rod 14.

[0030] In this embodiment, the arc-shaped guide rod 14 can guide the bending of the rubber sleeve 12 to avoid damage caused by uneven deformation or excessive deformation of the rubber sleeve 12. The limiting ring 16 can limit the maximum bending degree of the rubber sleeve 12 and the maximum stretching degree of the spring 15 to avoid excessive pressure when the fluid flow is maximum, thereby avoiding damage to the rubber sleeve 12 and the spring 15, thereby extending the service life of the device.

[0031] Working principle:

[0032] In normal use, the high-pressure stop valve can be operated by the hand wheel 17 to control the valve stem 3, so that the valve disc 4 is separated from the flow port inside the valve body 1, and the stop valve can be opened. The flow inside the valve body 1 gradually increases with the turning of the hand wheel 17. When the hand wheel 17 is just turned, the flow generated first flows through the inside of the valve body 1 from the buffer hole 11. At this time, the fluid flow direction is as follows Figure 1 From left to right as shown. When the fluid passes through the buffer hole 11, the flow rate can be accelerated due to the cross-sectional shape of the buffer hole 11, which facilitates the rapid circulation of the fluid. The flow rate of the valve body 1 increases after it is fully opened, and the pressure of the fluid will cause the disc-shaped rubber sleeve 12 to bend to the right. The greater the flow rate of the fluid, the greater the bending degree of the rubber sleeve 12. At this time, the fluid can flow through the edge of the rubber sleeve 12. The fluid needs to overcome the elastic force of the spring 15 and the elasticity of the rubber sleeve 12 itself, thereby reducing the impact of excessive flow of the fluid on the outlet flow channel 8 of the valve body 1.

[0033] After the valve body 1 is closed, the fluid stops. Since the rubber sleeve 12 itself has a certain elasticity and under the action of the elastic force of the spring 15, the disc-shaped rubber sleeve 12 will return to its initial shape. At this time, the fluid will impact the initial flow end. The fluid impact on the rubber sleeve 12 forces the rubber sleeve 12 to bend to the left. The impact of the fluid also needs to overcome the elastic force of the spring 15 and the elasticity of the rubber sleeve 12 itself, thereby converting part of the kinetic energy into internal energy for consumption. When the fluid hits the buffer plate 9, it can pass through the buffer hole 11. Under the action of the cross-sectional shape of the buffer hole 11, the flow rate of the fluid after flowing through the buffer hole 11 can be slowed down, so that the impact force of the fluid is reduced, and the water hammer effect of the fluid is buffered. At the same time, the fluid flowing through the edge of the rubber sleeve 12 is guided by the mounting ring 13 and merged with the fluid passing through the buffer hole 11. The convergence of the two can lead to the appearance of vortices and energy loss, further reducing the impact of the fluid.

[0034] The above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model. The technology, shape, and structure that are not described in detail in the utility model are all well-known technologies.

Claims

1. A high-pressure stop valve, comprising a valve body, a valve stem, a valve disc, a valve cover and a valve seat, wherein the valve body is provided with an inlet flow channel and an outlet flow channel at both ends, the valve body is provided with a flow port connecting the inlet flow channel and the outlet flow channel, the valve cover is mounted on the valve neck end of the valve body, a valve hole is opened in the middle of the valve cover, the valve stem passes through the valve hole and the bottom end of the valve stem extends into the outlet flow channel and is linked to the valve disc, characterized in that: A buffer plate is fixedly arranged in the inlet flow channel, a plurality of buffer holes are penetrated through the buffer plate, a rubber sleeve is fixedly arranged on the surface of the buffer plate, and the edge of the rubber sleeve contacts the inner wall of the inlet flow channel.

2. A high pressure stop valve according to claim 1, characterized in that: An axial stepped hole is provided in the inlet flow channel, wherein the end of the axial stepped hole close to the valve disc is a large diameter section, and the end away from the valve disc is a small diameter section. A mounting ring is provided at the hole shoulder of the axial stepped hole, and the size of the mounting ring gradually decreases from the small diameter section to the large diameter section of the axial stepped hole, and the buffer plate is located in the large diameter section of the axial stepped hole.

3. A high pressure stop valve according to claim 2, characterized in that: The mounting ring is evenly provided with a plurality of arc-shaped guide rods along the circumference of the mounting ring. One end of the arc-shaped guide rod is fixedly connected to one end of the mounting ring close to the large diameter section of the axial stepped hole, and the other end passes through the edge of the rubber sleeve to form a suspended end. The rubber sleeve is slidably matched with the arc-shaped guide rod.

4. A high pressure stop valve according to claim 3, characterized in that: A spring is sleeved on the surface of the arc-shaped guide rod, one end of the spring is fixedly connected to the mounting ring, and the other end of the spring is fixedly connected to the rubber sleeve.

5. A high pressure stop valve according to claim 3, characterized in that: A limiting ring is arranged at the suspended end of the arc-shaped guide rod.

6. A high pressure stop valve according to claim 1, characterized in that: The size of the buffer hole gradually decreases from the inlet flow channel to the outlet flow channel.

Images