Stop valve

Abstract

The utility model discloses a stop valve which comprises a shell, a valve body, a hand wheel and a valve seat, wherein the valve body is installed on the shell, a part of the valve body is located in the valve seat, the valve body comprises a connecting piece, a part of the connecting piece exceeds the valve body, the hand wheel is sleeved on the connecting piece, the connecting piece comprises a threaded section, the threaded section is located on the part, exceeding the valve body, of the connecting piece, and the threaded section is a two-way thread. The threaded section is provided with a first nut and a second nut, the thread directions of the first nut and the second nut are opposite, and the first nut and the second nut can press and fix the hand wheel in an abutting mode. And the problem that the nut is loosened is solved by utilizing the characteristic of double-thread self-locking.

Description

Technical Field

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

[0002] Most of the existing stop valve handwheels are locked by fitting the handwheel onto a threaded shaft and tightening a nut to press against the upper end surface of the handwheel. However, during frequent rotation of the handwheel, the nut may become loose and fall off, causing the handwheel to loosen and affect the normal use of the stop valve. Therefore, a technical solution is needed to solve the above problem. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a stop valve in view of the above technical requirements.

[0004] The utility model provides a stop valve, including a shell, a valve body, and a handwheel. The valve body is installed on the valve seat of the shell, a part of the valve body is located in the valve seat, the valve body includes a connecting piece, a part of the connecting piece exceeds the valve body, the handwheel is sleeved on the connecting piece, the connecting piece includes a threaded section, the threaded section is located at the part of the connecting piece that exceeds the valve body, the threaded section is a bidirectional thread, a first nut and a second nut are installed on the threaded section, the thread directions of the first nut and the second nut are opposite, and the first nut and the second nut can press and fix the handwheel.

[0005] Furthermore, the connecting member is provided with a stop edge, the lower end surface of the stop edge presses against the upper end surface of the valve body, and the lower end surface of the hand wheel presses against the upper end surface of the stop edge.

[0006] Furthermore, the connecting member is provided with an insert block, the insert block is located above the blocking edge, the handwheel includes a connecting ring, the connecting ring is provided with a socket matching the insert block, the threaded section passes through the socket, the socket is connected to the insert block, and the lower end faces of the first nut and the second nut press against the upper end face of the connecting ring.

[0007] Furthermore, a portion of the lower end of the threaded segment is located within the range of the connecting ring.

[0008] Furthermore, the plug block is in a rectangular structure, and the plug hole is a rectangular hole corresponding to the plug block.

[0009] Furthermore, it includes a top cover, which is installed on the hand wheel and covers the outside of the threaded section, the first nut and the second nut.

[0010] Furthermore, a limiting groove is provided on the side wall of the top cover, and a limiting block matching with the limiting groove is provided on the inner wall of the hand wheel, so that the top cover can be inserted into the hand wheel and fixed by rotation.

[0011] Furthermore, a protrusion is provided on the upper end surface of the top cover, a through hole is provided on the side wall of the protrusion, and the through hole passes through the protrusion.

[0012] Furthermore, the number of the protrusions is two, and the through holes of the two protrusions are aligned.

[0013] Compared with the related art, the stop valve provided by the utility model has the following beneficial effects:

[0014] 1. The utility model changes the screw structure on the valve stem, sets the thread section as a bidirectional thread, and then matches the first nut and the second nut with different rotation directions, and utilizes the self-locking characteristics of the double thread to solve the problem of nut loosening.

[0015] 2. The threaded section and the first nut and the second nut of the utility model can be covered and protected by the top cover, making the hand wheel more beautiful as a whole.

[0016] 3. The two protrusions provided on the upper end surface of the top cover of the utility model can be pushed by a push rod passing through the top cover to facilitate the installation and removal of the rotating top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of this embodiment.

[0018] Figure 2 is a cross-sectional view of this embodiment.

[0019] Figure 3 Schematic diagram of the valve seat and the valve body in this embodiment.

[0020] Figure 4 Schematic diagram of the top cover in this embodiment.

[0021] Figure 5 Schematic diagram of the hand wheel in this embodiment.

[0022] Numbers in the figure: 1, shell; 11, valve seat; 2, valve body; 21, connecting piece; 211, stop edge; 212, plug block; 213, threaded section; 3, hand wheel; 31, connecting ring; 311, plug hole; 32, limit block; 4, top cover; 41, limit groove; 42, protrusion; 421, through hole; 5, first nut; 6, second nut. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings show typical embodiments of the present invention.

[0024] like Figure 1 , Figure 2 , Figure 3As shown, the present embodiment discloses a stop valve, comprising a shell 1, a valve body 2, and a hand wheel 3. The valve body 2 is installed on a valve seat 11 of the shell 1. A valve port that can be blocked is provided inside the shell 1. The valve body 2 is provided with a piston that can be raised and lowered to block or open the valve port. The piston can be raised and lowered by turning the hand wheel 3 (this is not shown in the prior art figure). A portion of the valve body 2 is located in the valve seat 11. The valve body 2 comprises a connecting piece 21. A portion of the connecting piece 21 protrudes from the valve body 2. The connecting piece 21 is provided with a stop edge 211. The lower end surface of the stop edge 211 presses against the upper end surface of the valve body 2. The stop edge 211 provides a limit for the installation of the connecting piece 21 and the valve body 2.

[0025] like Figure 2 , Figure 5 As shown, the handwheel 3 is sleeved on the connecting member 21, and the connecting member 21 is provided with an insert block 212, and the insert block 212 is located above the retaining edge 211. The handwheel 3 includes a connecting ring 31, and the connecting ring 31 is provided with a socket 311 that cooperates with the insert block 212. The lower end surface of the connecting ring 31 presses against the upper end surface of the retaining edge 211, and the socket 311 is connected to the insert block 212. The insert block 212 is a rectangular structure, and the socket 311 is a rectangular hole corresponding to the insert block 212. The retaining edge 211 limits the installation position of the handwheel 3, and the rectangular insert block 212 cooperates with the rectangular socket 311 to enable the connecting member 21 to rotate when the handwheel 3 rotates.

[0026] like Figure 2 , Figure 3 As shown, the connecting member 21 includes a threaded section 213, which is located at the portion of the connecting member 21 that extends beyond the valve body 2. The threaded section 213 is a bidirectional thread. The threaded section 213 is installed with the first nut 5 and the second nut 6. The thread directions of the first nut 5 and the second nut 6 are opposite. The threaded section 213 passes through the insertion hole 311. The lower end surfaces of the first nut 5 and the second nut 6 press against the upper end surface of the connecting ring 31. The first nut 5 and the second nut 6 can press against and fix the handwheel 3. When the first nut 5 presses the connecting ring 31, the second nut 6 rotates in the opposite direction to press the first nut 5. In this embodiment, the threaded section 213 is set as a bidirectional thread, and is equipped with the first nut 5 and the second nut 6 with different rotation directions. The self-locking characteristics of the double thread are used to solve the problem of loosening of the nut and prevent the handwheel 3 from loosening due to multiple rotations.

[0027] More preferably, a portion of the lower end of the threaded segment 213 is located within the range of the connecting ring 31, so that the first nut 5 can always be threadedly engaged with the threaded segment 213 when rotating and pressing against the upper end surface of the connecting ring 31, so that the first nut 5 can press the connecting ring 31 more tightly.

[0028] like Figure 2 , Figure 4As shown, this embodiment also includes a top cover 4, which is installed on the handwheel 3, and the top cover 4 is covered on the outside of the threaded section 213, the first nut 5 and the second nut 6. The top cover 4 can cover the threaded section 213, the first nut 5 and the second nut 6 to make the overall appearance of the stop valve more beautiful, and at the same time can play a certain protective role on the threaded section 213, the first nut 5 and the second nut 6.

[0029] More preferably, a limit groove 41 is provided on the side wall of the top cover 4, and a limit block 32 cooperating with the limit groove 41 is provided on the inner wall of the handwheel 3. The top cover 4 can be inserted into the handwheel 3 and fixed by rotation. The top cover 4 first aligns the bottom opening of the limit groove 41 with the limit block 32 and inserts it downward into the handwheel 3. The limit block 32 is fixed by rotating the top cover 4 so that the limit block 32 is stuck in the horizontal groove of the limit groove 41. The groove of the limit groove 41 can limit the limit block 32.

[0030] More preferably, two protrusions 42 are provided on the upper end surface of the top cover 4, and a through hole 421 is provided on the side wall of the protrusion 42, and the through hole 421 passes through the protrusion 42, and the through holes 421 of the two protrusions 42 are aligned. When the top cover 4 is installed, a straight push rod can be passed through the through holes 421 of the two protrusions 42, and the top cover 4 can be rotated by pushing one end of the push rod, so that the rotation installation and disassembly of the top cover 4 are more convenient.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stop valve, characterized in that: The invention comprises a housing (1), a valve body (2), and a hand wheel (3); the valve body (2) is mounted on a valve seat (11) of the housing (1); a portion of the valve body (2) is located in the valve seat (11); the valve body (2) comprises a connecting piece (21); a portion of the connecting piece (21) protrudes from the valve body (2); the hand wheel (3) is sleeved on the connecting piece (21); the connecting piece (21) comprises a threaded section (213); the threaded section (213) is located at a portion of the connecting piece (21) protruding from the valve body (2); the threaded section (213) is a bidirectional thread; a first nut (5) and a second nut (6) are mounted on the threaded section (213); the threaded directions of the first nut (5) and the second nut (6) are opposite; the first nut (5) and the second nut (6) are capable of pressing and fixing the hand wheel (3).

2. A stop valve according to claim 1, characterized in that: The connecting member (21) is provided with a stop edge (211), the lower end surface of the stop edge (211) presses against the upper end surface of the valve body (2), and the lower end surface of the hand wheel (3) presses against the upper end surface of the stop edge (211).

3. A stop valve according to claim 2, characterized in that: The connecting member (21) is provided with an insert block (212), and the insert block (212) is located above the stop edge (211). The hand wheel (3) comprises a connecting ring (31), and the connecting ring (31) is provided with a plug hole (311) matched with the insert block (212). The threaded section (213) passes through the plug hole (311), and the plug hole (311) is connected to the insert block (212). The lower end surfaces of the first nut (5) and the second nut (6) press against the upper end surface of the connecting ring (31).

4. A stop valve according to claim 3, characterized in that: A portion of the lower end of the threaded section (213) is located within the range of the connecting ring (31).

5. A stop valve according to claim 3, characterized in that: The insert block (212) has a rectangular structure, and the insert hole (311) is a rectangular hole corresponding to the insert block (212).

6. A stop valve according to claim 1, characterized in that: It comprises a top cover (4), wherein the top cover (4) is mounted on the hand wheel (3), and the top cover (4) covers the outside of the threaded section (213), the first nut (5) and the second nut (6).

7. A stop valve according to claim 6, characterized in that: A limiting groove (41) is provided on the side wall of the top cover (4), and a limiting block (32) matching the limiting groove (41) is provided on the inner wall of the hand wheel (3), so that the top cover (4) can be inserted into the hand wheel (3) and fixed by rotation.

8. A stop valve according to claim 6, characterized in that: The upper end surface of the top cover (4) is provided with a protrusion (42), the side wall of the protrusion (42) is provided with a through hole (421), and the through hole (421) passes through the protrusion (42).

9. A stop valve according to claim 8, characterized in that: The number of the protrusions (42) is two, and the through holes (421) of the two protrusions (42) are aligned.

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