Plunger valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a plunger valve which comprises a valve body, a valve cover is arranged on the valve body, and a control unit is arranged on the valve cover. The valve seat is arranged in the valve body; the valve rod is arranged in the valve body, a plunger is arranged at the bottom end of the valve rod, and the valve rod is driven by the control unit to move; the leakage detection sealing group comprises two sealing rings which are distributed up and down along the axial direction of the valve rod; wherein the plunger can be matched with the valve seat in a sealing mode, the sealing set is arranged on the inner wall of the valve body, the sealing ring is coaxial with the valve rod, and compared with the prior art, the service life of the plunger valve is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a plunger valve. Background Technology

[0002] A plunger valve is a common industrial valve mainly used to control the flow of fluids (liquid or gas). It typically consists of a valve body, valve stem, plunger, seals, and valve seat. When the plunger moves upward, the valve seat opens, allowing fluid to pass through; when the plunger moves downward, the valve seat closes, preventing fluid from passing through. Plunger valves can be operated manually or electrically, pneumatically, etc. For example, a plunger valve disclosed in patent application number CN201920474756.8 includes a plunger valve body and a plunger. The inner surface of the valve body mates with the plunger to form a sealing surface. The valve is characterized by: a mounting bracket fixedly installed on the outside of the plunger; a first convex ring and a first sealing ring disposed within the first convex ring on the inner surface of the valve body; the first convex ring including a flange perpendicular to its body; and a frustum-shaped sealing cap embedded in the mounting bracket. The first sealing ring, sealing cap, and flange work together to achieve a seal.

[0003] In the operation of this existing plunger valve, the seal between the valve stem and the valve body is prone to leakage, and when leakage occurs, it is not easily detected. The medium flowing inside the valve body can easily corrode other structures on the valve, leading to a reduction in the valve's service life. Therefore, it is necessary to make improvements. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a plunger valve that improves the service life of the plunger valve.

[0005] In view of this, the present invention provides a plunger valve, comprising:

[0006] A valve body, on which a valve cover is provided, and on which a control unit is provided;

[0007] Valve seat, wherein the valve seat is disposed within the valve body;

[0008] A valve stem is disposed within the valve body, and a plunger is provided at the bottom end of the valve stem. The valve stem is driven to move by a control unit.

[0009] Also includes:

[0010] A leak detection sealing assembly, comprising two sealing rings distributed vertically along the valve stem axial direction;

[0011] The plunger can be sealed with the valve seat, the sealing assembly is disposed on the inner wall of the valve body, and the sealing ring is coaxial with the valve stem.

[0012] In this technical solution, during the use of the plunger valve, the two sealing rings distributed vertically along the valve stem axis in the leak detection sealing assembly achieve double sealing between the valve stem and the valve body. When medium leakage occurs between the valve stem and the valve body, after the medium breaks through the sealing surface of one sealing ring, the other sealing ring can still block the medium, preventing further leakage of the medium from corroding other components on the valve, thereby improving the service life of the plunger valve.

[0013] In the above technical solution, the leak detection sealing assembly further includes:

[0014] Micropores are provided on the valve body and extend from the inside of the valve body to the outside of the valve body.

[0015] The micropores are located between the two sealing rings.

[0016] In the above technical solution, the sealing ring further includes:

[0017] A sealing body, wherein the sealing body is annular;

[0018] An annular groove, wherein there are two annular grooves respectively disposed on the outer sealing surface and the inner sealing surface of the sealing body;

[0019] The annular groove has an isosceles trapezoidal cross-section and a narrow end at the opening.

[0020] Furthermore, the above technical solution also includes:

[0021] A pressure relief pipe is provided on the side of the valve body, and its two ends are connected to the inlet and outlet ends of the valve body, respectively.

[0022] A one-way valve is connected in series on a pressure relief pipe, and the one-way valve can relieve pressure from the inlet end to the outlet end of the valve body.

[0023] In the above technical solution, the one-way valve further includes:

[0024] The first valve body has a liquid inlet and a conical chamber.

[0025] The second valve body has a liquid outlet and a spring cavity inside it.

[0026] The valve core is in the shape of a circular plate. A sealing strip is provided on the force-bearing surface of the valve core. An annular baffle is provided at the end of the valve core away from the liquid inlet. Several protrusions are distributed on the side of the annular baffle opposite to the valve core.

[0027] A preload spring, one end of which is connected to an annular baffle, and the other end of which abuts against the inner wall of the spring cavity;

[0028] The first valve body is sealed to the second valve body. The inlet, outlet, conical chamber and spring chamber are all located on the axis of the pressure relief pipe. The conical chamber and spring chamber are provided with chamfered transition surfaces.

[0029] The beneficial effects of this utility model are:

[0030] 1. By setting up a leak-proof sealing assembly, a double seal is achieved between the valve stem and the valve body, preventing media leakage from corroding other components on the valve, thereby improving the service life of the plunger valve;

[0031] 2. By setting the annular groove on the sealing ring, when the medium breaks through the sealing surface of the sealing ring, it will first enter the annular groove, thereby generating pressure in the sealed cavity formed between the annular groove and the sealing surface. Under the action of pressure, the sealing ring expands and deforms outward, thereby further pressing the sealing surface, thus improving the sealing effect and preventing the medium from leaking.

[0032] 3. With the installation of pressure relief pipe and check valve, when the medium pressure inside the valve body is too high, the medium can be discharged through the pressure relief pipe past the plunger, thereby preventing damage to the plunger and valve seat under high pressure and improving the service life of the plunger valve. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model.

[0035] Figure 2 This is a schematic cross-sectional view of the valve body of this utility model.

[0036] Figure 3 This is a schematic diagram of the sealing ring structure of this utility model.

[0037] Figure 4 This is a schematic cross-sectional view of the sealing ring of this utility model.

[0038] Figure 5 This is a schematic diagram of the one-way valve structure of this utility model.

[0039] The markings in the diagram are as follows:

[0040] 1. Valve body; 2. Valve cover; 3. Control unit; 4. Valve seat; 5. Valve stem; 6. Plunger; 7. Sealing ring; 70. Sealing body; 71. Annular groove; 8. Micropore; 9. Pressure relief pipe; 10. Check valve; 11. First valve body; 12. Inlet; 13. Conical chamber; 14. Second valve body; 15. Outlet; 16. Spring chamber; 17. Valve core; 18. Sealing strip; 19. Annular baffle; 20. Protrusion; 21. Preload spring. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0043] Example 1:

[0044] This application provides a plunger 6 valve, including: a valve body 1, a valve cover 2 disposed on the valve body 1, a control unit 3 disposed on the valve cover 2; a valve seat 4 disposed inside the valve body 1; and a valve stem 5 disposed inside the valve body 1, with a plunger 6 disposed at the bottom end of the valve stem 5, and the valve stem 5 being driven to move by the control unit 3.

[0045] It also includes: a leak detection sealing assembly, which includes two sealing rings 7 distributed vertically along the valve stem 5 axis;

[0046] The plunger 6 can be sealed with the valve seat 4, the sealing assembly is set on the inner wall of the valve body 1, and the sealing ring 7 is coaxial with the valve stem 5.

[0047] In this embodiment, during use, the plunger 6 valve achieves double sealing between the valve stem 5 and the valve body 1 through the setting of two sealing rings 7 distributed vertically along the valve stem 5 in the leak detection sealing assembly. When medium leakage occurs between the valve stem 5 and the valve body 1, after the medium breaks through the sealing surface of one sealing ring 7, the other sealing ring 7 can still block the medium, preventing further leakage of the medium from corroding other components on the valve, thereby improving the service life of the plunger 6 valve.

[0048] Example 2:

[0049] This embodiment provides a plunger 6 valve, which, in addition to the technical solution of the above embodiment, also has the following technical features: the leak detection sealing group further includes: microhole 8, the microhole 8 is disposed on the valve body 1, and the microhole 8 extends from the inside of the valve body 1 to the outside of the valve body 1;

[0050] The micropore 8 is located between the two sealing rings 7.

[0051] In this embodiment, during use, the plunger 6 valve achieves double sealing between the valve stem 5 and the valve body 1 through the two sealing rings 7 distributed vertically along the valve stem 5 in the leak detection sealing assembly. When a medium leaks between the valve stem 5 and the valve body 1, after the medium breaks through the sealing surface of one sealing ring 7, the other sealing ring 7 can still block the medium, preventing further leakage and corrosion of other components on the valve. At the same time, after the medium breaks through the sealing surface of one sealing ring 7, the medium can overflow outward through the micro-hole 8 located between the two sealing rings 7, thus effectively alerting the operator that a leak has occurred between the valve stem 5 and the valve body 1. Furthermore, the outward overflow of the medium from the micro-hole 8 also prevents the medium from accumulating between the two sealing rings 7, causing pressure increases, and preventing the medium from further breaking through the other sealing ring 7 and corroding other components on the valve. Compared with the prior art, this invention effectively improves the service life of the plunger 6 valve.

[0052] Example 3:

[0053] This embodiment provides a plunger 6 valve, which, in addition to the technical solution of the above embodiment, also has the following technical features: the sealing ring 7 further includes: a sealing body 70, which is annular; and an annular groove 71, which has two grooves and is respectively disposed on the outer sealing surface and the inner sealing surface of the sealing body 70.

[0054] The annular groove 71 has an isosceles trapezoidal cross-section and a narrow end at the opening.

[0055] In this embodiment, by setting the annular groove 71 on the sealing ring 7, when the medium breaks through the sealing surface of the sealing ring 7, it will first enter the annular groove 71, thereby generating pressure in the sealed cavity formed between the annular groove 71 and the sealing surface. Under the action of pressure, the sealing ring 7 expands and deforms outward, thereby further pressing the sealing surface, thereby improving the sealing effect and preventing the medium from leaking.

[0056] Example 4:

[0057] This embodiment provides a plunger 6 valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including: a pressure relief pipe 9, which is disposed on the side of the valve body 1, and the two ends of the pressure relief pipe 9 are respectively connected to the inlet end and the outlet end of the valve body 1; a one-way valve 10, which is connected in series on the pressure relief pipe 9, and the one-way valve 10 can relieve pressure from the inlet end to the outlet end of the valve body 1.

[0058] The one-way valve 10 further includes: a first valve body 11, on which an inlet 12 is provided, and a conical chamber 13 is provided in the first valve body 11; a second valve body 14, on which an outlet 15 is provided, and a spring cavity 16 is provided in the second valve body 14; a valve core 17, which is in the shape of a circular plate, with a sealing strip 18 provided on the force-bearing surface of the valve core 17, and an annular baffle 19 provided at the end of the valve core 17 away from the inlet 12, with a plurality of protrusions 20 distributed on the side of the annular baffle 19 opposite to the valve core 17; and a preload spring 21, one end of which is connected to the annular baffle 19, and the other end abutting against the inner wall of the spring cavity 16;

[0059] The first valve body 11 is sealed to the second valve body 14. The inlet 12, outlet 15, conical chamber 13 and spring chamber 16 are all located on the axis of the pressure relief pipe 9. The conical chamber 13 and the spring chamber 16 are both provided with chamfered transition surfaces.

[0060] In this embodiment, by setting up the pressure relief pipe 9 and the one-way valve 10, when the medium pressure inside the valve body 1 is too high, the medium overcomes the clamping force of the pre-tightening spring 21 on the annular baffle 19, and the valve core 17 is pushed open by the medium, thereby making the one-way valve 10 open. The medium can pass through the pressure relief pipe 9 and pass over the plunger 6 for discharge, thereby preventing the plunger 6 and valve seat 4 from being damaged under high pressure, and improving the service life of the plunger 6 valve. At the same time, since the inlet 12, outlet 15, conical chamber 13 and spring chamber 16 are all located on the axis of the pressure relief pipe 9, the one-way valve 10 forms a straight-through structure, which can effectively reduce the flow resistance of the medium during the pressure relief process. In addition, the conical chamber 13 and the spring chamber 16 are both provided with chamfered transition surfaces, which can further reduce the flow resistance of the medium during the pressure relief process, prevent the medium from causing impact damage to the one-way valve 10 when the pressure is discharged, and improve the service life of the one-way valve 10.

[0061] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A plunger (6) valve, comprising: A valve body (1) is provided with a valve cover (2), and a control unit (3) is provided on the valve cover (2). Valve seat (4), the valve seat (4) is disposed inside the valve body (1); Valve stem (5), the valve stem (5) is disposed inside the valve body (1), and a plunger (6) is provided at the bottom end of the valve stem (5). The valve stem (5) is driven to move by the control unit (3). Its characteristic is that it further includes: Leak detection sealing assembly, the leak detection sealing assembly includes two sealing rings (7) distributed vertically along the valve stem (5) axis. The plunger (6) can be sealed with the valve seat (4), the sealing group is set on the inner wall of the valve body (1), and the sealing ring (7) is coaxial with the valve stem (5).

2. The plunger (6) valve according to claim 1, characterized in that, The leak detection sealing assembly also includes: Microholes (8) are provided on the valve body (1) and extend from the inside of the valve body (1) to the outside of the valve body (1); The micropore (8) is located between the two sealing rings (7).

3. A plunger (6) valve according to claim 2, characterized in that, The sealing ring (7) also includes: A sealing body (70) is annular; An annular groove (71), the annular groove (71) having two and respectively disposed on the outer sealing surface and the inner sealing surface of the sealing body (70); The annular groove (71) has an isosceles trapezoidal cross-section and the groove opening of the annular groove (71) is narrow.

4. A plunger (6) valve according to claim 3, characterized in that, Also includes: Pressure relief pipe (9) is provided on the side of valve body (1), and the two ends of the pressure relief pipe (9) are respectively connected to the inlet end and the outlet end of valve body (1); One-way valve (10), which is connected in series on the pressure relief pipe (9), can release pressure from the inlet end of the valve body (1) to the outlet end.

5. A plunger (6) valve according to claim 4, characterized in that, The one-way valve (10) also includes: The first valve body (11) is provided with a liquid inlet (12) and a conical chamber (13) is provided in the first valve body (11). The second valve body (14) has an outlet (15) and a spring cavity (16) inside. The valve core (17) is in the shape of a circular plate. A sealing strip (18) is provided on the force-bearing surface of the valve core (17). An annular baffle (19) is provided at one end of the valve core (17) away from the liquid inlet (12). Several protrusions (20) are distributed on the side of the annular baffle (19) opposite to the valve core (17). A preload spring (21) is provided, with one end connected to an annular baffle (19) and the other end abutting against the inner wall of the spring cavity (16). The first valve body (11) is sealed to the second valve body (14). The inlet (12), outlet (15), conical chamber (13) and spring chamber (16) are all located on the axis of the pressure relief pipe (9). The conical chamber (13) and spring chamber (16) are both provided with chamfered transition surfaces.

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