Anti-blocking piston type stop valve with high sealing performance

Abstract

The high-sealing-performance anti-blocking piston type stop valve comprises a valve body, a plunger assembly and a valve rod, the valve body is provided with a first valve port and a second valve port, the inner wall of the first valve port is provided with a sealing bearing, and the outer side of the first valve port is provided with a sealing plate; the plunger assembly is arranged in the center axis direction of the first valve port and comprises a sealing seat and a plunger which are sequentially connected from the first valve port to the interior of the valve, the plunger comprises a medium inflow section, a hollow plunger section and a medium outflow section which are sequentially connected and communicated, a medium circulation inlet is formed in the medium inflow section, and a medium circulation outlet is formed in the medium outflow section. When the valve is closed, the sealing seat contacts with the sealing plate to seal the first valve port; the valve rod is connected with the medium outflow section of the plunger to control the plunger to move in the center axis direction of the first valve port, and when the plunger moves, the outer wall of the hollow plunger section and the inner wall of the sealing bearing slide relatively. The hollow through-flow plunger ensures that silt flows away along with a medium to the maximum extent, the hollow plunger section is in sliding contact with the inner wall of the sealing bearing to remove the attached silt, and self-adaptive sealing of the valve is achieved through the lower sealing structure.

Description

Technical Field

[0001] The utility model relates to the technical field of valve design, in particular to a high-sealing anti-blocking piston type stop valve. Background Art

[0002] The piston stop valve is a widely used valve on the market. It has low friction between the sealing surfaces during opening and closing, is easy to manufacture, and is convenient to maintain. The sealing of the piston stop valve is achieved by applying torque to the valve stem, which applies pressure to the valve disc in the axial direction, so that the sealing surface of the valve disc fits tightly with the sealing surface of the valve seat, preventing the medium from leaking along the gap between the sealing surfaces.

[0003] Traditional general stop valve products have simple valve disc structures, and often have problems such as poor valve sealing or sediment accumulation in the valve cavity, which leads to valve blockage. The sediment and other impurities cannot be discharged completely, and the sealing gasket is easily damaged by the sediment, which seriously affects the service life of the product, has a high maintenance frequency, and has poor working reliability.

[0004] The patent with the publication number CN116642018A discloses a stop valve for preventing blockage, wherein a valve cavity is arranged in the stop valve body, and a channel connecting the valve cavity is arranged on the right side and the lower side of the stop valve body, and flanges are arranged on the channels, and a connecting hole is opened on the flange, and a filter screen is arranged in the connecting hole, and an upper valve body is arranged on the upper side of the valve cavity, and the upper valve body is passed through by the valve stem assembly, and a valve disc is also arranged in the valve cavity for lifting and closing the valve cavity by the valve stem assembly, and a hollow cylindrical body is arranged at the upper end of the valve disc, and the lower end of the valve stem assembly is inserted into the hollow cylindrical body and is threadedly connected with the inner wall of the hollow cylindrical body, and a strip hollow is arranged on the hollow cylindrical body, and a base is arranged at the lower end of the valve stem assembly to be rotatably connected with the lower end of the valve stem assembly, and the two sides of the base are fixedly arranged on the inner side of the upper valve body through the strip hollow. The filter screen arranged on the flange of the patent can filter impurities entering the valve cavity, and the structural arrangement of the valve disc and the valve stem assembly can operate the valve disc in a narrow space.

[0005] The above patent sets a cup-shaped filter screen for preventing valve body from clogging. On the one hand, it filters the impurities entering the valve cavity to prevent the valve cavity from clogging. On the other hand, the cup-shaped filter screen can effectively increase the filtration area to prevent the filter screen from affecting the liquid flow rate, and finally achieve the effect of preventing the valve body from clogging. However, even if the aperture of the filter screen is small, it cannot block fine particles of sand. It can only block large molecular and large volume impurities from entering the valve body. Once fine particles of sand enter the valve body, they are very likely to adhere to the inner wall of the valve body at the closed position of the valve plate, resulting in the valve plate not closing the valve tightly.

[0006] In addition, the valve plate seal of a traditional stop valve is generally arranged in the valve body, and the first annular sealing gasket on the stop valve of the above-mentioned patent is arranged in the valve body. This sealing method is also very likely to cause the valve to be loosely closed or the seal to fail as the water pressure is continuously applied. Summary of the invention

[0007] The technical problem to be solved by the utility model is to provide a high-sealing anti-blocking piston type stop valve which can effectively avoid the accumulation of mud and sand at the valve closing position in view of the defects of the prior art.

[0008] The purpose of the utility model is achieved through the following technical solutions:

[0009] A high-sealing anti-blocking piston stop valve, comprising:

[0010] Valve body: having a first valve port and a second valve port, the first valve port and the second valve port are arranged at an angle, the second valve port is a medium outlet, a sealing bearing is arranged on the inner wall of the first valve port, and a sealing plate is arranged on the outer side of the first valve port;

[0011] Plunger assembly: arranged along the central axis direction of the first valve port, including a sealing seat and a plunger connected in sequence from the first valve port to the inside of the valve body, the plunger including a medium inlet section, a hollow plunger section and a medium outlet section which are connected and communicated in sequence, the medium inlet section is provided with a medium flow inlet, the medium outlet section is provided with a medium flow outlet, the medium inlet section is in contact with the sealing seat, and the sealing seat is used to contact with the sealing plate in the valve closing state to seal the first valve port;

[0012] Valve stem: arranged on the valve body and connected to the medium outflow section of the plunger to control the plunger to move along the central axis direction of the first valve port. When the plunger moves, the outer wall of the hollow plunger section and the inner wall of the sealing bearing slide relative to each other.

[0013] Furthermore, the end of the sealing seat close to the hollow plunger section is a conical end, and the conical surface of the conical end extends to the medium flow inlet.

[0014] Furthermore, the length of the hollow plunger section is equal to the height of the sealing bearing.

[0015] Furthermore, a plurality of mutually connected medium flow inlets are provided on the medium inflow section.

[0016] Furthermore, a plurality of mutually connected medium flow outlets are provided on the medium outflow section.

[0017] Furthermore, the sealing seat and the medium inflow section are interference fit.

[0018] Furthermore, a cylindrical pin connection is provided between the sealing seat and the medium inflow section.

[0019] Furthermore, the sealing seat is a rubber-lined sealing seat.

[0020] Furthermore, the second valve port is provided with a filter screen and a retaining ring.

[0021] Furthermore, the sealing plate and the valve body are connected by bolts.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The present invention designs the plunger assembly to be a hollow through-flow type. When the valve is opened, the medium enters from the medium flow inlet, flows through the hollow plunger section, and then flows out from the medium flow outlet into the valve body, and finally is discharged from the second valve port. During the flow of the medium, the medium will basically not contact the inner wall of the valve body that plays a sealing role when the valve is closed, and the sediment in the medium will flow away with the medium.

[0024] Even if the sand in the medium adheres to and accumulates on the inner wall of the valve body during the process of opening and closing the valve, the outer wall of the hollow plunger section will slide and contact with the inner wall of the sealing bearing when it moves in the valve body, thereby removing the attached sand one by one;

[0025] The piston stop valve adopts a lower sealing structure, that is, the sealing seat is arranged outside the valve body. With the action of the pressure water at the first valve port of the valve, the valve is closed more and more tightly, realizing the adaptive sealing of the valve, and the sealing effect is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional structural diagram of the piston stop valve described in Example 1 (valve closing state);

[0027] Figure 2 It is a structural perspective view of the piston type stop valve described in Example 1;

[0028] Figure 3 It is a cross-sectional structural diagram of the piston stop valve described in Example 1 (half-open valve state);

[0029] Figure 4 This is a cross-sectional structural diagram of the piston stop valve described in Example 1 (fully open valve state). DETAILED DESCRIPTION

[0030] In order to clearly illustrate the technical features of the present solution, the present technical solution is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0032] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0035] Example 1

[0036] A kind of Figure 1The piston stop valve shown in the figure comprises a valve body 1, a plunger assembly 2 and a valve stem 3, wherein the valve body 1 has a first valve port 11 and a second valve port 12, the central axes of the first valve port 11 and the second valve port 12 are perpendicular to each other, a sealing bearing 4 is provided on the inner wall of the first valve port 11, and a sealing plate 5 is provided on the outer end face of the first valve port 11, the first valve port 11 is the sealing position of the stop valve when the valve is closed, and the second valve port 12 is the medium outlet.

[0037] The plunger assembly 2 is arranged along the central axis direction of the first valve port, and includes a sealing seat 21 and a plunger 22 which are sequentially connected from the first valve port 11 to the inside of the valve body. Figure 2 As shown, the plunger 22 includes an integrated medium inflow section 221, a hollow plunger section 222 and a medium outflow section 223, which are arranged in sequence and interconnected, wherein the medium inflow section 221 is connected to the sealing seat 21. The medium inflow section 221 is provided with a plurality of mutually interconnected medium flow inlets 2210, and the medium outflow section 223 is also provided with a plurality of mutually interconnected medium flow outlets 2230. In fact, the medium inflow section 221, the hollow plunger section 222 and the medium outflow section 223 are equivalent to providing a medium flow inlet and a medium flow outlet on the two end walls of a hollow pipe, and the medium inflow section 221 and the medium outflow section 223 both have hollow inner holes. Among them, the sealing seat 21 is embedded in the hollow inner hole of the medium inflow section 221, and the two are interference fit. The sealing seat 21 is used to contact with the sealing plate 5 in the valve closing state to seal the first valve port 11, and the outer wall of the medium inflow section 221 is embedded in the inner ring of the sealing bearing 4.

[0038] The valve stem 3 is arranged on the valve body 1 and connected to the medium outflow section 223 of the plunger through the connecting plate 6 and the T-screw, and cooperates with the screw sleeve 7 to control the plunger 2 to move along the central axis direction of the first valve port 11. When the plunger 2 is driven to move by the valve stem 3, the outer wall of the hollow plunger section 222 and the inner wall of the sealing bearing 4 slide relative to each other, so as to realize the opening and closing of the stop valve. The length of the hollow plunger section 222 is equal to the height of the sealing bearing 4. For example, from Figure 1 The closed valve state is Figure 3 The half-open state then Figure 4 In the fully open state, as the valve stem 3 rotates and moves downward, the hollow plunger section 222 gradually moves downward until it contacts the inner wall of the sealing bearing 4 and continues to move up and down relatively until the outer wall of the hollow plunger section 222 completely coincides with the inner wall of the sealing bearing 4. At this time, the valve stem 3 moves downward to the limit position of the stroke (the limit design of the valve stem is the same as that of the valve stem limit of a conventional valve).

[0039] In order to allow the medium to flow in more smoothly at the medium flow inlet, the end of the sealing seat 21 close to the hollow plunger section 222 is designed as a conical end 211. The conical surface of the conical end 211 extends to the medium flow inlet 2210, approximately to the center height of the medium flow inlet or a little above the center, and the top of the cone is exactly on the center axis of the plunger 2. At this time, no matter which medium flow inlet it flows from, it enters the hollow plunger section 222 along the conical slope channel. The conical surface design provides a certain amount of assistance for the medium circulation.

[0040] In this embodiment, a cylindrical pin is provided between the sealing seat 21 and the medium inflow section 221 to further enhance the sealing stability and reliability of the sealing seat. The sealing plate 5 and the valve body 1 are connected by bolts to prevent the sealing plate from easily falling off or loosening from the valve body. The sealing plate is made of stainless steel to prevent corrosion caused by long-term contact between its sealing surface and the medium.

[0041] The stop valve of this embodiment is provided with a hollow through-flow plunger assembly, which can ensure that at any opening, the medium can only enter from the medium flow inlet, flow through the hollow plunger section, and then flow out from the medium flow outlet into the valve body, and finally be discharged from the second valve port. On the one hand, the medium will basically not contact the inner wall of the valve body (mainly the inner ring of the sealing bearing) that plays a sealing role when the valve is closed during the flow process, and the mud and sand in the medium will flow along with the medium; on the other hand, even if the mud and sand in the medium adheres to and accumulates on the inner wall of the valve body during the process of opening and closing the valve, the outer wall of the hollow plunger section will slide and contact with the inner wall of the sealing bearing when it is displaced in the valve body, and the attached mud and sand and other debris will be completely removed; therefore, the stop valve of this embodiment has excellent anti-blocking performance.

[0042] In addition, since the sealing seat of the stop valve is arranged on the outside of the valve body, that is, a lower sealing structure is adopted, with the action of the pressure water at the first valve port of the valve, the fit between the sealing seat and the sealing plate changes adaptively with the pressure change of the medium in the circulation pipeline, and the valve will be closed tighter and tighter, giving the stop valve an excellent adaptive high sealing function, and the sealing effect is safe and reliable, and this sealing design can also play a good protective role for the sealing seat.

[0043] Example 2

[0044] A piston stop valve comprises a valve body, a plunger assembly and a valve stem, wherein the valve body has a first valve port and a second valve port, the central axes of the first valve port and the second valve port are perpendicular to each other, a sealing bearing is provided on the inner wall of the first valve port, and a sealing plate is provided on the outer end face of the first valve port, the first valve port is the sealing position of the stop valve when the valve is closed, and the second valve port is the medium outlet.

[0045] The plunger assembly is arranged along the central axis direction of the first valve port, and includes a sealing seat and a plunger that are sequentially connected from the first valve port to the inside of the valve body. The plunger includes an integrated design of a medium inlet section, a hollow plunger section, and a medium outflow section, which are arranged in sequence and interconnected, wherein the medium inflow section and the sealing seat are connected. The medium inflow section is provided with a plurality of mutually interconnected medium flow inlets, and the medium outflow section is also provided with a plurality of mutually interconnected medium flow outlets. In fact, the medium inflow section, the hollow plunger section, and the medium outflow section are equivalent to providing a medium flow inlet and a medium flow outlet on the two end walls of a hollow pipe, and the medium inflow section and the medium outflow section both have hollow inner holes. Among them, the sealing seat is embedded in the hollow inner hole of the medium inflow section, and the two are interference fit. The sealing seat is used to contact with the sealing plate in the valve closing state to seal the first valve port, and at the same time, the outer wall of the medium inflow section is embedded in the inner ring of the sealing bearing.

[0046] The valve stem is arranged on the valve body and connected with the medium outflow section of the plunger through a connecting plate and a T-screw, and cooperates with the threaded sleeve to control the movement of the plunger along the central axis direction of the first valve port. When the plunger is driven to move by the valve stem, the outer wall of the hollow plunger section and the inner wall of the sealing bearing slide relative to each other, thereby realizing the opening and closing of the stop valve. The length of the hollow plunger section is equal to the height of the sealing bearing.

[0047] In order to allow the medium to flow in more smoothly at the medium flow inlet, the end of the sealing seat close to the hollow plunger section is designed as a conical end. The conical surface of the conical end extends to the medium flow inlet, approximately to the center height of the medium flow inlet or a little above the center, and the top of the cone is exactly on the center axis of the plunger. At this time, no matter which medium flow inlet it flows from, it enters the hollow plunger section along the conical slope channel. The conical surface design provides a certain amount of assistance for the medium flow.

[0048] In this embodiment, a cylindrical pin is provided between the sealing seat and the medium inflow section to further enhance the sealing stability and reliability of the sealing seat. The sealing plate and the valve body are connected by bolts to prevent the sealing plate from easily falling off or loosening from the valve body. The sealing plate is made of stainless steel to prevent corrosion caused by long-term contact between its sealing surface and the medium.

[0049] The difference between this embodiment and embodiment 1 is that the sealing seat is an integral rubber-lined sealing seat, which can further ensure reliable sealing.

[0050] Example 3

[0051] The difference between this embodiment and embodiment 2 is that a filter screen and a retaining ring are provided at the second valve port of the piston stop valve to effectively prevent foreign matter from entering the valve body.

[0052] Obviously, the above embodiments are merely examples for clearly illustrating the technical solution of the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A high-sealing anti-blocking piston stop valve, characterized in that: include: Valve body: having a first valve port and a second valve port, the first valve port and the second valve port are arranged at an angle, the second valve port is a medium outlet, a sealing bearing is arranged on the inner wall of the first valve port, and a sealing plate is arranged on the outer side of the first valve port; Plunger assembly: arranged along the central axis direction of the first valve port, including a sealing seat and a plunger connected in sequence from the first valve port to the inside of the valve body, the plunger including a medium inlet section, a hollow plunger section and a medium outlet section which are connected and communicated in sequence, the medium inlet section is provided with a medium flow inlet, the medium outlet section is provided with a medium flow outlet, the medium inlet section is in contact with the sealing seat, and the sealing seat is used to contact with the sealing plate in the valve closing state to seal the first valve port; Valve stem: arranged on the valve body and connected to the medium outflow section of the plunger to control the plunger to move along the central axis direction of the first valve port. When the plunger moves, the outer wall of the hollow plunger section and the inner wall of the sealing bearing slide relative to each other.

2. The high-sealing anti-blocking piston stop valve according to claim 1 is characterized in that: The end of the sealing seat close to the hollow plunger section is a conical end, and the conical surface of the conical end extends to the medium flow inlet.

3. The high-sealing anti-blocking piston stop valve according to claim 1, characterized in that: The length of the hollow plunger section is equal to the height of the sealed bearing.

4. The high-sealing anti-blocking piston stop valve according to claim 1, characterized in that: The medium inflow section is provided with a plurality of medium flow inlets which are interconnected.

5. The high-sealing anti-blocking piston stop valve according to claim 1, characterized in that: The medium outflow section is provided with a plurality of medium flow outlets which are interconnected.

6. The high-sealing anti-blocking piston stop valve according to claim 1, characterized in that: The sealing seat and the medium inflow section are interference fit.

7. The high-sealing anti-blocking piston stop valve according to claim 1, characterized in that: A cylindrical pin connection is also provided between the sealing seat and the medium inflow section.

8. The high-sealing anti-blocking piston stop valve according to claim 1, characterized in that: The sealing seat is a rubber-lined sealing seat.

9. The high-sealing anti-blocking piston stop valve according to claim 1, characterized in that: The second valve port is provided with a filter screen and a retaining ring.

10. The high-sealing anti-blocking piston stop valve according to claim 1, characterized in that: The sealing plate and the valve body are connected by bolts.

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