Stop valve with double-valve-clack sealing structure

Abstract

The utility model relates to the technical field of stop valves, in particular to a stop valve with a double-valve-clack sealing structure, which comprises a valve seat, the double-valve-clack sealing structure matched with the valve seat in a sealing mode is arranged above the valve seat, and the double-valve-clack sealing structure comprises an inner-layer valve clack and an outer-layer valve clack. A mounting space for mounting the inner-layer valve clack is formed in the outer-layer valve clack, the inner-layer valve clack is arranged in the outer-layer valve clack, a group of disc springs for connecting the inner-layer valve clack are fixedly mounted on the top layer in the mounting space of the outer-layer valve clack, the top end of the inner-layer valve clack is fixedly connected to the interior of the outer-layer valve clack, and the inner-layer valve clack is fixedly connected to the outer-layer valve clack. A valve seat inner sealing face matched with the double-valve-clack sealing structure to achieve sealing is arranged in the valve seat.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a stop valve with a double valve flap sealing structure. Background Art

[0002] The stop valve is a forced sealing valve. When the valve is closed, pressure must be applied to the valve seat to force the sealing surface to prevent leakage. The stop valve generally adopts a low-inlet and high-outlet flow channel. When the medium enters the valve from under the valve disc, the valve stem operating force needs to overcome the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve.

[0003] The sealing surface of the stop valve adopts flat surface or conical surface sealing. The flat surface sealing is simpler to process than the conical surface sealing, but the sealing effect is worse than the conical surface sealing. The stop valve can be used for cutting, regulating and throttling in some special occasions. Since the valve stem opening or closing stroke of this type of valve is relatively short and has a very reliable cutting function, and since the change of the valve seat opening is directly proportional to the stroke of the valve disc, it is very suitable for regulating the flow rate. Since the stop valve is a forced sealing valve, it usually has only one sealing surface. Once the sealing surface is worn, it is easy to leak, especially with corrosive media and steam media.

[0004] At present, a Chinese patent with publication number CN206439422U discloses a sealed stop valve, which includes a valve body, a valve bonnet is provided on the top of the valve body, a screw rod is inserted in the middle of the valve body, a hand wheel is provided at the upper end of the screw rod, a nameplate is provided at the lower end of the hand wheel, a hexagonal cap is sleeved on the upper end of the valve bonnet, a mouth ring is provided inside the hexagonal cap, a valve plate core is installed at the lower end of the screw rod, a valve plate rubber is sleeved on the outer side of the valve plate core, a slot is provided at the bottom end of the valve body, a sealing plate is installed on the side wall of the lower end of the screw rod, the middle part of the sealing plate is a hollow structure, a rubber pad is inserted in the middle part of the sealing plate, a support pad is provided on the side of the rubber pad close to the screw rod, and the support pad is connected to the inside of the sealing plate through a reset spring.

[0005] Although this stop valve solves the problem that ordinary models use metal-to-metal hard sealing, impurities cannot be mixed into the pipeline medium, and it cannot be well sealed when cut off, but: the sealing surface of this stop valve is still a single-layer structure. Once the seal is worn due to long-term use or corrosive media, the seal of the stop valve will fail. There is no emergency sealing measure and the overall service life is short. Utility Model Content

[0006] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the utility model is to provide a stop valve with a double valve flap sealing structure, which has a double sealing structure and can be effective in both static sealing and dynamic sealing conditions, greatly extending its service life.

[0007] The above technical objectives of the utility model are achieved through the following technical solutions:

[0008] A stop valve with a double-valve flap sealing structure comprises a valve seat, a double-valve flap sealing structure which cooperates with the valve seat for sealing is provided above the valve seat, the double-valve flap sealing structure comprises an inner valve flap and an outer valve flap, an installation space for installing the inner valve flap is provided inside the outer valve flap, and the inner valve flap is arranged inside the outer valve flap, a group of disc springs for connecting the inner valve flap are fixedly installed on the top layer inside the installation space of the outer valve flap, the top end of the inner valve flap is fixedly connected to the inside of the outer valve flap, and the inside of the valve seat is provided with an inner sealing surface of the valve seat which cooperates with the double-valve flap sealing structure to achieve sealing.

[0009] Furthermore, the inner sealing surface of the valve seat includes a first conical sealing surface and a second conical sealing surface. The first conical sealing surface is arranged on the outside of the flow channel opening in the valve seat, and the second conical sealing surface is arranged at the upper end opening position inside the valve seat. The first conical sealing surface and the second conical sealing surface are both arranged along a circle of the valve seat. The first conical sealing surface forms a seal with the inner valve disc, and the second conical sealing surface forms a seal with the outer valve disc.

[0010] Furthermore, a third conical sealing surface matching the first conical sealing surface is provided at the lower end of the inner valve flap, a first steel ball groove is provided inside the inner valve flap, a second steel ball groove is provided inside the outer valve flap, first connecting steel balls are installed inside the first steel ball groove and the second steel ball groove, and a stable connection is achieved between the inner valve flap and the outer valve flap via the first connecting steel ball, and the first steel ball groove is larger in size than the second steel ball groove.

[0011] Furthermore, a third steel ball groove is provided in the outer valve disc at the upper end of the second steel ball groove, and the third steel ball groove is located on the upper part of the disc spring. A valve stem fixed to the outer valve stem is provided at the upper end of the outer valve disc, and a valve stem bottom plane is provided at the lower end of the valve stem for contacting the upper end of the outer valve disc. A fourth steel ball groove is provided on the outer ring of the lower end of the valve stem, and a second connecting steel ball is installed between the third steel ball groove and the fourth steel ball groove.

[0012] Furthermore, a first sealing block is provided on the outer side of the first connecting steel ball and is welded and fixed on the outer valve disc.

[0013] Furthermore, a second sealing block is provided on the outer side of the second connecting steel ball and is welded and fixed on the outer valve disc.

[0014] In summary, the utility model has the following beneficial effects:

[0015] The utility model adopts a double valve disc sealing structure. Both the inner valve disc and the outer valve disc generate a static sealing surface with the valve seat. The double sealing structure fully guarantees the sealing effect and maintains the safety and stability of the medium system.

[0016] The utility model installs two sets of connecting steel balls, disc springs and other structures between the inner valve disc, the outer valve disc and the valve stem, which not only enhances the stability of the internal structure of the stop valve, but also forms a dynamic seal in coordination with the movement of the valve stem.

[0017] The double sealing capability of the utility model can effectively resist the situation where the sealing failure of the stop valve is caused by the wear of a single sealing surface, thereby greatly extending the service life of the stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application, but do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the valve seat of the utility model;

[0021] Figure 3 It is a schematic diagram of the outer valve disc of the utility model;

[0022] Figure 4 It is a schematic diagram of the inner valve disc of the utility model;

[0023] Figure 5 It is a schematic diagram of the disc spring of the utility model.

[0024] In the figure, 1. valve seat; 11. first conical sealing surface; 12. second conical sealing surface; 2. inner valve disc; 21. third conical sealing surface; 22. first steel ball groove; 3. outer valve disc; 31. fourth conical sealing surface; 32. second steel ball groove; 33. third steel ball groove; 4. first connecting steel ball; 5. disc spring; 6. valve stem; 61. fourth steel ball groove; 7. second connecting steel ball; 8. first sealing block; 9. second sealing block. DETAILED DESCRIPTION

[0025] The above and other technical contents, features and functions of the present invention are described in detail below with reference to the attached Figure 1 To Attachment Figure 5 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0026] Various exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings. Example

[0027] A stop valve with a double-valve flap sealing structure comprises a valve seat 1, a double-valve flap sealing structure which is sealed with the valve seat 1 is arranged above the valve seat 1, the double-valve flap sealing structure comprises an inner valve flap 2 and an outer valve flap 3, an installation space for installing the inner valve flap 2 is arranged inside the outer valve flap 3, and the inner valve flap 2 is arranged inside the outer valve flap 3, a group of disc springs 5 ​​for connecting the inner valve flap 2 is fixedly installed on the top layer inside the installation space of the outer valve flap 3, and the top end of the inner valve flap 2 is fixedly connected to the inside of the outer valve flap 3,

[0028] The interior of the valve seat 1 is provided with an inner sealing surface of the valve seat 1 which cooperates with the double valve disc sealing structure to achieve sealing. The inner sealing surface of the valve seat 1 includes a first conical sealing surface 11 and a second conical sealing surface 12. The first conical sealing surface 11 is arranged at the outer side of the flow channel opening in the valve seat 1, and the second conical sealing surface 12 is arranged at the upper end opening position inside the valve seat 1. The first conical sealing surface 11 and the second conical sealing surface 12 are both arranged along a circle of the valve seat 1. The first conical sealing surface 11 forms a seal with the inner valve disc 2, and the second conical sealing surface 12 forms a seal with the outer valve disc 3.

[0029] The lower end of the inner valve flap 2 is provided with a third conical sealing surface 21 matching the first conical sealing surface 11, the interior of the inner valve flap 2 is provided with a first steel ball groove 22, the interior of the outer valve flap 3 is provided with a second steel ball groove 32, and the first connecting steel ball 7 is installed inside the first steel ball groove 22 and the second steel ball groove 32, and the inner valve flap 2 and the outer valve flap 3 are stably connected through the first connecting steel ball 7.

[0030] Since the disc spring 5 is installed and placed between the outer valve flap 3 and the inner valve flap 2, the inner valve cooperates and guides to the outer valve flap 3, and makes the top surface of the inner valve flap 2 contact and pressurize the disc spring 5 until the first connecting steel ball 7 can be smoothly introduced into the first steel ball groove 22 of the inner valve flap 2 and the second steel ball groove 32 of the outer valve flap 3, thus forming a stable connection.

[0031] A third steel ball groove 33 is provided at the upper end of the second steel ball groove 32 in the outer valve flap 3. The third steel ball groove 33 is located on the upper part of the disc spring 5. A valve stem 6 fixed to the outer valve stem 6 is provided at the upper end of the outer valve flap 3. A bottom plane of the valve stem 6 is provided at the lower end of the valve stem 6 for contacting the upper end of the outer valve flap 3. A fourth steel ball groove 61 is provided on the outer ring of the lower end of the valve stem 6. A second connecting steel ball is installed between the third steel ball groove 33 and the fourth steel ball groove 61.

[0032] The valve stem 6 is guided and inserted into the outer valve disc 3 so that the bottom plane of the valve stem 6 contacts the upper plane of the outer valve disc 3 until the second connecting steel ball can be smoothly introduced into the third steel ball groove 33 of the outer valve disc 3 and the fourth steel ball groove 61 of the valve stem 6, thereby realizing a stable connection between the outer valve disc 3 and the valve stem 6.

[0033] A first sealing block 8 welded and fixed to the outer valve disc 3 is provided on the outer side of the first connecting steel ball 4, and a second sealing block 9 welded and fixed to the outer valve disc 3 is provided on the outer side of the second connecting steel ball 7 to prevent the first connecting steel ball 7 and the second connecting steel ball 7 from falling off.

[0034] Since the first steel ball groove 22 of the inner valve flap 2 is larger than the second steel ball groove 32 of the outer valve flap 3, in the present embodiment, the first steel ball groove 22 of the inner valve flap 2 is 2-3mm larger than the second steel ball groove 32 of the outer valve flap 3, which enables the inner valve flap 2 to move freely up and down, and the third conical sealing surface 21 of the inner valve flap 2 contacts the first conical sealing surface 11 of the valve seat 1. At this time, the inner valve flap 2 moves upward and compresses the disc spring 5. As the valve stem 6 closes downward, under the spring preload force of the disc spring 5, the first conical sealing surface 11 and the third conical sealing surface 21 fully cooperate to apply pressure to form a first sealing force; when the valve stem 6 continues to close downward, the fourth conical sealing surface 31 of the outer valve flap 3 contacts and cooperates to apply pressure to the second conical sealing surface 12 of the valve seat 1 until it is sealed, thereby forming a second sealing force.

[0035] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the field of the present invention and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. A stop valve with a double valve disc sealing structure, characterized in that: The invention comprises a valve seat (1), wherein a double valve flap sealing structure which cooperates with the valve seat (1) in a sealing manner is provided above the valve seat (1), wherein the double valve flap sealing structure comprises an inner valve flap (2) and an outer valve flap (3), wherein an installation space for installing the inner valve flap (2) is provided inside the outer valve flap (3), and the inner valve flap (2) is arranged inside the outer valve flap (3), and a group of disc springs (5) for connecting the inner valve flap (2) are fixedly installed on the top layer inside the installation space of the outer valve flap (3), and the top end of the inner valve flap (2) is fixedly connected to the inside of the outer valve flap (3), and the inside of the valve seat (1) is provided with an inner sealing surface of the valve seat (1) which cooperates with the double valve flap sealing structure to achieve sealing.

2. The stop valve with a double valve disc sealing structure according to claim 1, characterized in that: The inner sealing surface of the valve seat (1) comprises a first conical sealing surface (11) and a second conical sealing surface (12); the first conical sealing surface (11) is arranged outside the flow channel opening in the valve seat (1), and the second conical sealing surface (12) is arranged at the upper end opening position inside the valve seat (1); the first conical sealing surface (11) and the second conical sealing surface (12) are both arranged along a circumference of the valve seat (1); the first conical sealing surface (11) forms a seal with the inner valve disc (2), and the second conical sealing surface (12) forms a seal with the outer valve disc.

3. The stop valve with a double valve flap sealing structure according to claim 2, characterized in that: A third conical sealing surface (21) matching the first conical sealing surface (11) is provided at the lower end of the inner valve flap (2); a first steel ball groove (22) is provided inside the inner valve flap (2); a second steel ball groove (32) is provided inside the outer valve flap (3); first connecting steel balls (4) are installed inside the first steel ball groove (22) and the second steel ball groove (32); the inner valve flap (2) and the outer valve flap (3) are stably connected via the first connecting steel balls (4); and the first steel ball groove (22) is larger than the second steel ball groove (32).

4. The stop valve with a double valve flap sealing structure according to claim 2, characterized in that: A third steel ball groove (33) is provided in the outer valve flap (3) at the upper end of the second steel ball groove (32), and the third steel ball groove (33) is located on the upper part of the disc spring (5). A valve stem (6) fixed to the outer valve stem (6) is provided at the upper end of the outer valve flap (3), and a bottom plane of the valve stem (6) is provided at the lower end of the valve stem (6) for contacting with the upper end of the outer valve flap (3). A fourth steel ball groove (61) is provided on the outer ring of the lower end of the valve stem (6), and a second connecting steel ball is installed between the third steel ball groove (33) and the fourth steel ball groove (61).

5. The stop valve with a double valve flap sealing structure according to claim 3, characterized in that: The outer side of the first connecting steel ball (4) is provided with a first sealing block (8) which is welded and fixed on the outer valve disc (3).

6. The stop valve with a double valve flap sealing structure according to claim 4, characterized in that: A second sealing block (9) is provided on the outer side of the second connecting steel ball (7) and is welded and fixed on the outer valve disc (3).

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