Pilot-operated type sealing valve with novel sealing structure

Abstract

The pilot-operated type sealing valve with the novel sealing structure comprises a valve element and a valve seat, the valve element comprises a first sealing face, the valve seat comprises a second sealing face, the first sealing face is an arc face protruding outwards, the second sealing face is a plane, and when the sealing valve is in a closed state, the first sealing face and the second sealing face are in a closed state. And the first sealing surface of the valve core is in contact with the second sealing surface of the valve seat. According to the utility model, the sealing of the valve core, namely the first sealing surface, is designed to be the cambered surface which protrudes outwards, and when the first sealing surface is in contact with the sealing surface, namely the second sealing surface, of the valve seat for sealing, compared with linear sealing, the binding surface is located in the middle of the sealing surface of the valve seat, and the sealing surface of the valve core has a small width; even if the opening degree is small, the device is not easily flushed by a fluid medium; in addition, compared with double-conical-surface sealing, the cambered surface has a large ratio, it is guaranteed that the cambered surface can be completely attached to the sealing surface of the valve seat even if machining and assembling errors exist, and leakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pilot-operated sealing valve with a novel sealing structure. Background Art

[0002] The sealing of the valve core and valve seat of the sealing valve or regulating valve is generally a double cone seal or a line seal. Double cone seal (the sealing surface angle is generally 60° or 90°) Figure 1 As shown in the figure, the valve core sealing surface D and the valve seat sealing surface E are both conical surfaces. The two fit together and it can be seen that the sealing surface area is large. When the same pressure is applied to the valve core, the pressure acting on the sealing surface (i.e., specific pressure) is small, and the sealing effect is not good. In addition, due to the deviation of processing and assembly, the two conical surfaces (valve core sealing surface D and valve seat sealing surface E) may not be concentric, resulting in poor alignment of the two conical surfaces, making it difficult to achieve the sealing requirements and causing leakage. Figure 2 As shown, the valve core sealing surface D and the valve seat sealing surface E are also conical surfaces. The two surfaces shrink into a line. Although a larger sealing specific pressure can be achieved, on the one hand, under a larger pressure, the sealing line of the valve core may be crushed, thereby damaging the sealing performance; on the other hand, the contact line is easily washed away by the rapidly flowing fluid medium when the opening is small. If the medium contains harder particles, it is more likely to be washed away. Utility Model Content

[0003] The purpose of the present invention is to solve at least one of the above technical deficiencies.

[0004] Therefore, one purpose of the utility model is to provide a pilot-operated sealing valve with a novel sealing structure to solve the problems mentioned in the background technology and overcome the deficiencies in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A pilot-operated sealing valve with a novel sealing structure comprises a valve core and a valve seat, wherein the valve core comprises a first sealing surface, and the valve seat comprises a second sealing surface, wherein the first sealing surface is an arc surface convex outwardly, and the second sealing surface is a plane, and when the sealing valve is in a closed state, the first sealing surface of the valve core contacts the second sealing surface of the valve seat.

[0007] Furthermore, the sealing valve also includes a valve stem, one end of which is connected to the valve core, and one end of the valve stem connected to the valve core is inserted into the interior of the valve seat.

[0008] Furthermore, the valve core also includes a front end face, a side face and a rear end face, the front end face and the rear end face are both circular planes, the area of ​​the front end face is smaller than the area of ​​the rear end face, the front end face is connected to the first sealing surface, the first sealing surface is connected to the side face, and the side face is connected to the rear end face.

[0009] Furthermore, a first valve cavity and a second valve cavity are provided inside the valve seat, a connecting cavity is provided between the first valve cavity and the second valve cavity, and the second sealing surface is provided at the junction of the connecting cavity and the first valve cavity.

[0010] Furthermore, the communicating cavity is cylindrical in shape, and the cross-sectional diameter of the communicating cavity is smaller than or equal to the diameter of the front end surface of the valve core.

[0011] Furthermore, the sealing valve also includes a compression sleeve, which is arranged inside the valve seat, a through hole is provided in the middle of the compression sleeve, a plurality of flow holes are evenly distributed around the through hole, and the valve stem passes through the compression sleeve.

[0012] Furthermore, the sealing valve also includes an elastic retaining ring, and the elastic retaining ring is arranged at the connection between the compression sleeve and the valve seat.

[0013] Furthermore, the outer surface of the valve seat is provided with a plurality of annular grooves, and the plurality of annular grooves are evenly distributed along the axial direction of the valve seat.

[0014] Furthermore, the first sealing surface includes a first arc surface, a second arc surface and a first plane, and the first plane is located between the first arc surface and the second arc surface.

[0015] Therefore, the utility model has the following beneficial effects:

[0016] The utility model discloses a pilot-operated sealing valve with a novel sealing structure, in which the sealing of the valve core, i.e., the first sealing surface, is designed to be an arc surface convex outwardly. When the arc surface contacts with the sealing surface of the valve seat, i.e., the second sealing surface, for sealing, compared with the line seal, the fitting surface is located in the middle position of the valve seat sealing surface, and since the valve core sealing surface has a tiny width, it is not easily washed by the fluid medium even at a small opening. In addition, compared with the double-cone seal, the arc surface has a larger deviation, and at the same time, it ensures that it can be completely fitted on the valve seat sealing surface even if there are processing and assembly errors, and no leakage will be caused. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1It is a schematic diagram of the structure of the valve core and valve seat using double cone sealing in the prior art;

[0019] Figure 2 It is a schematic diagram of the structure of the valve core and valve seat using wire sealing in the prior art;

[0020] Figure 3 This is a schematic diagram of the overall structure of the sealing valve of the utility model embodiment;

[0021] Figure 4 This is a front view of the sealing valve of the utility model embodiment;

[0022] Figure 5 yes Figure 4 AA section view in;

[0023] Figure 6 yes Figure 5 Enlarged view of point B in the middle;

[0024] Figure 7 This is a schematic diagram of the valve core and valve stem of an embodiment of the utility model;

[0025] Figure 8 This is a schematic diagram of the valve core structure of an embodiment of the utility model;

[0026] Fig. 9 This is a front view of the valve core of the utility model embodiment;

[0027] Fig.10 This is a schematic diagram of the overall structure of the valve seat in the embodiment of the utility model;

[0028] Fig.11 This is a front view of the valve seat of the utility model embodiment;

[0029] Fig.12 yes Fig.11 CC section view in;

[0030] Fig.13 This is a schematic diagram of the compression sleeve structure of an embodiment of the utility model;

[0031] Fig.14 This is a schematic diagram of the structure of the elastic retaining ring of the utility model embodiment;

[0032] Fig.15 This is a schematic diagram illustrating the structure of the first sealing surface in an embodiment of the utility model;

[0033] Fig.16 It is a structural diagram of the first sealing surface of an embodiment of the utility model.

[0034] In the figure: 1, valve core; 2, valve seat; 3, valve stem; 4, compression sleeve; 5, elastic retaining ring; 6, first sealing surface; 7, second sealing surface; 8, front end surface; 9, side surface; 10, rear end surface; 11, first valve cavity; 12, connecting cavity; 13, second valve cavity; 14, through hole; 15, flow hole; 16, annular groove; 17, opening; 18, first arc surface; 19, first plane; 20, second arc surface; D, valve core sealing surface; E, valve seat sealing surface. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] like Figure 3-Figure 14 As shown, a pilot-operated sealing valve with a novel sealing structure includes a valve core 1 and a valve seat 2, the valve core 1 includes a first sealing surface 6, the valve seat 2 includes a second sealing surface 7, the first sealing surface 6 is an arc surface convex outward, and the second sealing surface 7 is an inclined plane. When the sealing valve is in a closed state, the first sealing surface 6 of the valve core 1 contacts the second sealing surface 7 of the valve seat 2.

[0038] like Figure 8 and Fig. 9 As shown, the first sealing surface 6 of the valve core 1 is an arc surface convex outward. Fig. 9 From the front view of the valve core 1, the projection edge of the first sealing surface 6 of the valve core 1 is not a straight line, but an arc. Figure 8 From the axial side perspective, the first sealing surface 6 of the valve core 1 is a closed annular surface formed by an arc surface or a curved surface, or a partial spherical surface. For ease of understanding, Fig.15 As shown, the first sealing surface 6 is similar to a partial spherical surface on a sphere / spherical surface, and has a certain curvature.

[0039] Furthermore, the first sealing surface 6 includes a first arc surface 18 , a second arc surface 20 and a first plane 19 , and the first plane 19 is located between the first arc surface 18 and the second arc surface 20 .

[0040] As an implementation method, the first sealing surface 6 of the valve core 1 is composed of arc surfaces on both sides and a plane in the middle, such as Fig.16 As shown, the first sealing surface 6 includes a first curved surface 18 on one side, a first plane 19 in the middle and a second curved surface 20 on the other side. The cross-sectional view of the first sealing surface 6 is as shown in FIG. Fig.16 As shown, the first plane 19 can be directly machined, or can be first machined into a spherical surface and then the first plane 19 is ground.

[0041] As an implementation manner, the first plane 19 is located in the middle of the first sealing surface 6 .

[0042] As an implementation manner, the first plane 19 is located in the middle and slightly outside of the first sealing surface 6 .

[0043] As an implementation manner, the widths of the first arc surface 18 and the second arc surface 20 are equal.

[0044] As an implementation manner, the width of the first arc surface 18 is greater than the width of the second arc surface 20 .

[0045] As an implementation manner, the width of the first arc surface 18 is smaller than the width of the second arc surface 20 .

[0046] As an implementation manner, the width of the first plane 19 is one quarter of the width of the first sealing surface 6 .

[0047] As an implementation manner, the width of the first plane 19 is one fifth of the width of the first sealing surface 6 .

[0048] As an implementation manner, the width of the first plane 19 is one eighth of the width of the first sealing surface 6 .

[0049] As an implementation manner, the width of the first plane 19 is between 0.2-0.5 mm.

[0050] As a specific implementation, the width of the first plane 19 is 0.2 mm.

[0051] As a specific implementation, the width of the first plane 19 is 0.3 mm.

[0052] As a specific implementation, the width of the first plane 19 is 0.5 mm.

[0053] like Figure 6 , which is an enlarged cross-sectional view of the first sealing surface 6 of the valve core 1 and the second sealing surface 7 of the valve seat 2 when they are in contact and sealed. Figure 1 and Figure 2Compared with the existing sealing structure shown in the figure, it can be seen that compared with the line seal, its fitting surface is located in the middle of the sealing surface of the valve seat 2, and because the sealing surface of the valve core 1 has a small width, it is not easy to be washed even at a small opening; in addition, the spherical surface ensures that the sealing surface of the valve core 1 can be completely fitted on the sealing surface of the valve seat 2 even if there are processing and assembly errors. It can be said that it brings together the advantages of the two existing seals and avoids their disadvantages.

[0054] like Figure 3 , Figure 4 and Figure 7 As shown, the sealing valve further includes a valve stem 3 , one end of which is connected to the valve core 1 , and one end of the valve stem 3 connected to the valve core 1 is inserted into the interior of the valve seat 2 .

[0055] like Figure 8 , Fig. 9 As shown, the valve core 1 also includes a front end face 8, a side face 9 and a rear end face 10. The front end face 8 and the rear end face 10 are both circular planes. The area of ​​the front end face 8 is smaller than the area of ​​the rear end face 10. The front end face 8 is connected to the first sealing surface 6, the first sealing surface 6 is connected to the side face 9, and the side face 9 is connected to the rear end face 10.

[0056] like Figure 8 The first sealing surface 6 is a closed arc surface or a partial spherical surface with a certain angle. When the first sealing surface 6 and the second sealing surface 7 are in contact and fit, Figure 6 As shown, a spherical surface + conical surface sealing type is adopted, and the second sealing surface 7 is a plane, but has a certain angle, and its overall shape is similar to the side surface of a truncated cone.

[0057] like Fig.12 As shown, a first valve cavity 11 and a second valve cavity 13 are provided inside the valve seat 2 , a connecting cavity 12 is provided between the first valve cavity 11 and the second valve cavity 13 , and a second sealing surface 7 is provided at the junction of the connecting cavity 12 and the first valve cavity 11 .

[0058] like Figure 5 As shown, the valve core 1 is located in the first valve cavity 11 of the valve seat 2. The valve core 1 can move along the axial direction of the valve stem 3 under the action of the valve stem 3, so that the first sealing surface 6 of the valve core 1 fits with the second sealing surface 7 of the valve seat 2, and the valve core 1 blocks the connecting cavity 12 to achieve sealing.

[0059] Furthermore, the shape of the communication cavity 12 is cylindrical, and the cross-sectional diameter of the communication cavity 12 is less than or equal to the diameter of the front end surface 8 of the valve core 1 .

[0060] Specifically, the valve seat 2 is cylindrical as a whole, and a cylindrical cavity is provided inside the valve core 1, which are a first valve cavity 11, a second valve cavity 13 and a connecting cavity 12 connecting the first valve cavity 11 and the second valve cavity 13.

[0061] As an implementation manner, the inner diameters of the first valve cavity 11 and the second valve cavity 13 are equal, and the inner diameter of the communication cavity 12 is smaller than the inner diameter of the first valve cavity 11 .

[0062] As an implementation manner, the inner diameter of the first valve cavity 11 is larger than the inner diameter of the second valve cavity 13 , and the inner diameter of the communication cavity 12 is smaller than the inner diameter of the second valve cavity 13 .

[0063] As an implementation manner, the inner diameter of the first valve cavity 11 is smaller than the inner diameter of the second valve cavity 13 , and the inner diameter of the communication cavity 12 is smaller than the inner diameter of the first valve cavity 11 .

[0064] As a specific implementation, the inner diameters of the first valve chamber 11 and the second valve chamber 13 are equal, and the inner diameter of the communication chamber 12 is one third of the inner diameter of the first valve chamber 11 .

[0065] As a specific implementation, the inner diameters of the first valve cavity 11 and the second valve cavity 13 are equal, and the inner diameter of the communication cavity 12 is one quarter of the inner diameter of the first valve cavity 11 .

[0066] That is to say, the inner diameters of the first valve chamber 11, the second valve chamber 13 and the connecting chamber 12 and their specific size ratios are not fixed. The utility model does not impose specific restrictions on the inner diameters of the first valve chamber 11, the second valve chamber 13 and the connecting chamber 12 and their specific size ratios, and they can be selectively set according to the specific usage scenario of the sealing valve.

[0067] like Figure 5 and Fig.13 As shown, the sealing valve further includes a pressing sleeve 4, which is arranged inside the valve seat 2, a through hole 14 is arranged in the middle of the pressing sleeve 4, a plurality of flow holes 15 are evenly distributed around the through hole 14, and the valve stem 3 passes through the pressing sleeve 4.

[0068] As an implementation manner, the through hole 14 and the flow hole 15 are both circular, and the through hole 14 and the flow hole 15 penetrate the pressing sleeve 4 and are arranged along the axial direction of the pressing sleeve 4 .

[0069] As an implementation manner, the inner diameter of the through hole 14 is greater than the inner diameter of the flow hole 15 .

[0070] As another embodiment, the inner diameter of the through hole 14 is equal to the inner diameter of the flow hole 15 .

[0071] As another embodiment, the inner diameter of the through hole 14 is smaller than the inner diameter of the flow hole 15 .

[0072] As an implementation method, Fig.13 As shown, there are specifically 6 flow holes 15. The 6 flow holes 15 are evenly distributed around the through hole 14.

[0073] As an implementation manner, there may be 8 flow holes 15 , which are evenly distributed around the through hole 14 .

[0074] As an implementation manner, there are specifically 10 flow holes 15 , which are evenly distributed around the through hole 14 .

[0075] like Figure 5 and Fig.14 As shown, the sealing valve further comprises an elastic retaining ring 5 , which is arranged at the connection between the pressing sleeve 4 and the valve seat 2 .

[0076] Specifically, Fig.14 As shown, the elastic retaining ring 5 is in an annular shape as a whole, and an opening 17 is provided on the annular elastic retaining ring 5. One end of the opening 17 is a plane perpendicular to the tangent of the retaining ring opening 17, and the other end of the opening 17 is composed of a plane perpendicular to the tangent of the retaining ring opening 17 and an inwardly concave curved surface.

[0077] like Fig.10 As shown, the outer surface of the valve seat 2 is provided with a plurality of annular grooves 16 , and the plurality of annular grooves 16 are evenly distributed along the axial direction of the valve seat 2 .

[0078] The utility model improves the sealing surface type of the pilot valve core: the sealing pair (the first sealing surface 6 and the second sealing surface 7) is changed from the original two conical surfaces to one conical surface and one arc surface (spherical surface), thereby increasing the reliability and feasibility of the seal, and adopts a spherical surface + conical surface sealing type to improve the sealing performance, and can achieve zero leakage.

[0079] The specific implementation is: the sealing surface of the valve core is processed into an arc surface, and the sealing surface of the valve seat is a conical surface (an inclined plane with a certain angle). Then, different welding materials are welded on the hardening treatment of the valve core and the valve seat to ensure that the hardness of the valve seat sealing surface is higher than the valve core sealing surface HRC5-7 degrees. After that, the two sealing surfaces are ground together. Since the hardness of the spherical sealing surface of the valve core is slightly lower, it can be ensured that the spherical sealing surface of the valve core is worn during the grinding process. In addition, since both sealing surfaces are welded with hard alloy, the valve core sealing surface only needs to be slightly ground out with a width of 0.2-0.5mm to achieve a close fit of the two sealing surfaces. In this way, since the actual matching surface is small (about 0.2-0.5mm in width), a larger pressure (i.e., specific pressure) can be achieved under the same pressure, thereby achieving better sealing. Compared with another popular wire seal, since the sealing surface has a certain width (0.2-0.5mm), it is not easy to press out grooves on the sealing surface, so it is not easy to damage the sealing performance.

[0080] The sealing structure of the pilot valve of the utility model is easier to achieve sealing performance than a large cone seal; and is less likely to press out a groove than a wire seal, thereby better ensuring the continuity of the seal.

[0081] 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 utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0082] It is not difficult for those skilled in the art to understand that the utility model includes any combination of the utility model content and the specific implementation method part of the above specification and the various parts shown in the drawings. Due to the limited space and to make the specification concise, the various schemes composed of these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0083] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pilot-operated sealing valve with a novel sealing structure, characterized in that: It includes a valve core and a valve seat, the valve core includes a first sealing surface, the valve seat includes a second sealing surface, the first sealing surface is an arc surface convex outward, and the second sealing surface is an inclined plane. When the sealing valve is in a closed state, the first sealing surface of the valve core contacts the second sealing surface of the valve seat.

2. A pilot-operated sealing valve with a novel sealing structure according to claim 1, characterized in that: It also includes a valve stem, one end of which is connected to the valve core, and one end of the valve stem connected to the valve core is inserted into the interior of the valve seat.

3. A pilot-operated sealing valve with a novel sealing structure according to claim 1 or 2, characterized in that: The valve core also includes a front end face, a side face and a rear end face, the front end face and the rear end face are both circular planes, the area of ​​the front end face is smaller than the area of ​​the rear end face, the front end face is connected to the first sealing surface, the first sealing surface is connected to the side face, and the side face is connected to the rear end face.

4. A pilot-operated sealing valve with a novel sealing structure according to claim 3, characterized in that: A first valve cavity and a second valve cavity are provided inside the valve seat, a connecting cavity is provided between the first valve cavity and the second valve cavity, and the second sealing surface is provided at the junction of the connecting cavity and the first valve cavity.

5. A pilot-operated sealing valve with a novel sealing structure according to claim 4, characterized in that: The communicating cavity is cylindrical in shape, and the cross-sectional diameter of the communicating cavity is less than or equal to the diameter of the front end surface of the valve core.

6. A pilot-operated sealing valve with a novel sealing structure according to claim 2, characterized in that: It also includes a pressing sleeve, which is arranged inside the valve seat. A through hole is arranged in the middle of the pressing sleeve, and a plurality of flow holes are evenly distributed around the through hole. The valve stem passes through the pressing sleeve.

7. A pilot-operated sealing valve with a novel sealing structure according to claim 6, characterized in that: It also includes an elastic retaining ring, which is arranged at the connection between the compression sleeve and the valve seat.

8. A pilot-operated sealing valve with a novel sealing structure according to any one of claims 1, 2, 6 or 7, characterized in that: The outer surface of the valve seat is provided with a plurality of annular grooves, and the plurality of annular grooves are evenly distributed along the axial direction of the valve seat.

9. A pilot-operated sealing valve with a novel sealing structure according to claim 1, characterized in that: The first sealing surface includes a first arc surface, a second arc surface and a first plane, and the first plane is located between the first arc surface and the second arc surface.

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