Improved fire hydrant valve clack

Abstract

The utility model relates to the field of fire hydrant valve clacks, in particular to an improved fire hydrant valve clack which is characterized in that the improved fire hydrant valve clack comprises a valve clack cover and a valve clack handle which are fixedly connected, and a mounting cavity which is opened upwards and used for allowing the lower end of a valve rod to be inserted in is formed in the valve clack handle. A plurality of positioning holes communicated with the mounting cavity are evenly formed in the outer surface of the valve clack handle in the circumferential direction of the valve clack handle, positioning balls matched with the positioning holes and capable of moving are arranged in the positioning holes, and annular limiting blocks are fixedly arranged at the ends, close to the mounting cavity, of the inner surfaces of the positioning holes. The local outer surface of the positioning ball can penetrate through the annular limiting block and is detachably clamped in an annular clamping groove in the outer surface of the lower end of the valve rod, the valve clack handle is sleeved with a movable sleeve which is matched with the valve clack handle and can slide up and down, a limiting part is arranged on the top of the valve clack handle, and an elastic piece is arranged on the valve clack handle. The valve clack and the valve rod can be disassembled and assembled more easily, conveniently and efficiently, time and labor are saved, the reliability of connection between the valve clack and the valve rod is improved, and the service life of the valve clack and the valve rod is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of fire hydrant valve flaps, in particular to an improved fire hydrant valve flap. Background Art

[0002] A fire hydrant is a fixed fire-fighting facility that provides water support in case of fire or other dangerous situations requiring water. Fire hydrants usually cooperate with valve discs and valve seats, and the valve disc moves up and down under the drive of the valve stem to open and close the water inlet on the valve seat. The fixed installation between the valve disc and the valve stem is usually achieved by screwing a straight iron wire or copper wire into the valve disc and bending it into a circle and clamping it with an iron wire clamp or copper wire clamp between the first annular groove on the valve disc and the second annular groove on the valve stem. The iron wire has a certain strength, and it is relatively laborious and troublesome to assemble, and it is not easy to assemble. In order to make the copper wire or iron wire better screwed into the valve disc, the copper wire or iron wire is generally made of softer material, and the strength of soft material is relatively low. In this way, once the hand wheel is turned excessively, it is very easy to cause the copper wire clamp or iron wire clamp to break and damage, so that the valve stem and the valve disc are separated, which will affect the reliability of the connection between the two. When the valve stem and the valve disc need to be separated, the copper wire clamp or iron wire clamp must be twisted off before they can be disassembled. Maintenance is relatively inconvenient, time-consuming and laborious. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an improved fire hydrant valve flap which can make the disassembly and assembly between the valve flap and the valve stem easier, more convenient, more efficient, save time and effort, and is beneficial to improving the reliability of the connection between the valve flap and the valve stem and extending the service life.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: an improved fire hydrant valve flap, comprising a valve flap cover and a valve flap handle fixedly connected, a mounting cavity which is open upward and used for inserting the lower end of the valve stem, a plurality of positioning holes which are evenly arranged on the outer surface of the valve flap handle along its circumferential direction communicating with the mounting cavity, a matching and movable positioning ball is arranged in the positioning hole, an annular limit block is fixedly arranged on the inner surface of the positioning hole at one end close to the mounting cavity, a partial outer surface of the positioning ball can pass through the annular limit block and be detachably clamped in the annular clamping groove on the outer surface of the lower end of the valve stem, a matching and movable sleeve which can slide up and down is sleeved on the valve flap handle, a limiting portion which is provided on the top of the valve flap handle for limiting the upward sliding of the movable sleeve, and an elastic member which is provided on the valve flap handle for always applying an upward elastic force to the movable sleeve and keeping the movable sleeve covering the positioning hole to limit the positioning ball.

[0005] Furthermore, an annular avoidance groove for avoiding the positioning ball and allowing the positioning ball to completely escape from the annular groove is provided at the top of the inner surface of the movable sleeve. The bottom surface of the annular avoidance groove is inclined inward and downward and is an annular conical surface.

[0006] Furthermore, the limiting part is an elastic retaining spring, and an annular groove matched with the elastic retaining spring is provided on the outer surface of the top of the valve disc handle, and the elastic retaining spring is detachably clamped in the annular groove.

[0007] Furthermore, the elastic member is a compression spring, which is sleeved on the valve flap handle and located below the movable sleeve.

[0008] Furthermore, the number of the positioning holes is 3-6.

[0009] Furthermore, the positioning balls are steel balls.

[0010] Furthermore, the width of the annular groove is greater than the diameter of the positioning ball and enables the valve stem to move downward until the bottom end surface of the valve stem abuts against the bottom surface of the installation cavity.

[0011] Furthermore, a first rounded corner is provided on the outer peripheral edge of the bottom end of the valve stem, and a second rounded corner is provided on the outer peripheral edge of the bottom surface of the annular groove on the valve stem.

[0012] Furthermore, a positioning groove matched with the valve flap handle is provided at the center of the upper end surface of the valve flap cover, and the valve flap handle is fixedly welded in the positioning groove.

[0013] Furthermore, a cavity open downwards is provided at the bottom of the valve flap handle.

[0014] From the above description, it can be seen that the utility model provides an improved fire hydrant valve flap, and has the following beneficial effects: it can make the disassembly and assembly between the valve flap and the valve stem easier, more efficient, and save time and effort, and the valve flap and the valve stem will not cause damage to any parts when they are disassembled, which is beneficial to reducing maintenance costs. At the same time, through the setting of the positioning ball, the friction resistance is smaller, which can better ensure the smoothness of the relative rotation between the valve flap and the valve stem, which is beneficial to improving the reliability of the connection between the valve flap and the valve stem, and is beneficial to extending the overall service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a three-dimensional structural schematic diagram of an improved fire hydrant valve disc.

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the valve disc cover.

[0017] Figure 3 Schematic diagram of the internal structure of the valve disc handle.

[0018] Figure 4The utility model is a structural schematic diagram of an improved fire hydrant valve disc and a valve stem when connected.

[0019] Figure 5 for Figure 4 A local enlarged schematic diagram of point A in the middle.

[0020] In the figure: 1-valve flap cover; 11-positioning groove; 2-valve flap handle; 21-installation cavity; 22-positioning hole; 23-annular limit block; 24-annular groove; 25-cavity; 3-positioning ball; 4-movable sleeve; 41-annular avoidance groove; 5-elastic retaining spring; 6-compression spring; 7-valve stem; 71-annular retaining groove; 72-first fillet; 73-second fillet. DETAILED DESCRIPTION

[0021] The present invention is further described below through specific implementation methods.

[0022] like Figures 1 to 5 As shown, an improved fire hydrant valve flap described in the utility model comprises a valve flap cover 1 and a valve flap handle 2 which are fixedly connected. The valve flap handle 2 is provided with a mounting cavity 21 which is open upward and used for inserting the lower end of the valve stem 7. A plurality of positioning holes 22 which are communicated with the mounting cavity 21 are evenly provided on the outer surface of the valve flap handle 2 along its circumferential direction. The positioning holes 22 are provided with matching and movable positioning balls 3. An annular limiting block 23 is fixedly provided on the inner surface of the positioning hole 22 at one end close to the mounting cavity 21. The positioning balls 3 are provided with a plurality of positioning holes 22 which are communicated with the mounting cavity 21. A partial outer surface can pass through the annular limit block 23 and can be detachably clamped in the annular clamping groove 71 on the outer surface of the lower end of the valve stem 7; a movable sleeve 4 that is compatible and can slide up and down is sleeved on the valve flap handle 2; a limiting portion is provided on the top of the valve flap handle 2 for limiting the upward sliding of the movable sleeve 4; an elastic member is provided on the valve flap handle 2 for always applying an upward elastic force to the movable sleeve 4 and keeping the movable sleeve 4 covering the positioning hole 22 to limit the positioning ball 3.

[0023] In addition, the valve flap cover 1 is disc-shaped, and the valve flap handle 2 is cylindrical. When the valve flap needs to be assembled on the valve stem 7, it is only necessary to slide the movable sleeve 4 downward so that the movable sleeve 4 only partially covers the positioning hole 22, thereby not completely limiting the positioning ball 3, allowing the positioning ball 3 to move slightly outward and partially extend out of the positioning hole 22, and then, the lower end of the valve stem 7 can be easily and smoothly inserted into the mounting cavity 21 of the valve flap handle 2. During the insertion process, the positioning ball 3 can be pushed by the valve stem 7 and adaptably The movable sleeve 4 is then released, and at this time, the movable sleeve 4 can slide upward and reset under the elastic force of the elastic member, so that the movable sleeve 4 pushes the positioning ball 3 to move inward and makes the partial outer surface of the positioning ball 3 re-engaged in the annular groove 71, so that the valve flap and the valve stem 7 can be easily and stably assembled. When the valve flap needs to be detached from the valve stem 7, it is only necessary to slide the movable sleeve 4 downward so that the movable sleeve 4 only partially blocks the valve flap. The positioning hole 22 is formed, so that the positioning ball 3 is not completely limited, and the positioning ball 3 is allowed to move slightly outward and partially extend out of the positioning hole 22. Then, the lower end of the valve stem 7 can be taken out from the mounting cavity 21 of the valve flap handle 2. During the removal process, the positioning ball 3 can be pushed by the valve stem 7 and adaptively moved outward a little distance, so that the valve stem 7 can be smoothly separated from the mounting cavity 21 of the valve flap handle 2. Then, the movable sleeve 4 can be loosened. At this time, the movable sleeve 4 is in the elastic force of the elastic member. The valve flap 3 can be slid upward and reset, thereby pushing the positioning ball 3 to move inward and reset again. In this way, the disassembly and assembly between the valve flap and the valve stem 7 can be easier, simpler, more efficient, and save time and effort. The valve flap and the valve stem 7 will not cause damage to any parts when they are disassembled, which is beneficial to reducing maintenance costs. At the same time, through the setting of the positioning ball 3, the friction resistance is smaller, which can better ensure the smoothness of the relative rotation between the valve flap and the valve stem 7, which is beneficial to improving the reliability of the connection between the valve flap and the valve stem 7 and helping to extend the overall service life.

[0024] In addition, an annular avoidance groove 41 is provided on the top of the inner surface of the movable sleeve 4 for avoiding the positioning ball 3 and making the positioning ball 3 completely disengage from the annular groove 71. In this way, when the movable sleeve 4 slides downward to the height corresponding to the annular avoidance groove 41 and the positioning ball 3, at this time, when the valve stem 7 is taken out from the mounting cavity 21 of the valve flap handle 2, the positioning ball 3 can be pushed to move into the annular avoidance groove 41, and at this time, the movable sleeve 4 can also maintain the limiting effect on the positioning ball 3, so that the positioning ball 3 will not completely disengage from the positioning hole 22. In addition, the bottom surface of the annular avoidance groove 41 is inclined inwardly and downwardly and is an annular conical surface. In this way, when the movable sleeve 4 slides upward and resets under the elastic force of the elastic member, the annular conical surface can more smoothly push the positioning ball 3 inward.

[0025] The limiting part is an elastic retaining spring 5 , and an annular groove 24 matched with the elastic retaining spring 5 is provided on the top outer surface of the valve flap handle 2 , and the elastic retaining spring 5 is detachably retained in the annular groove 24 .

[0026] The elastic member is a compression spring 6, which is sleeved on the valve flap handle 2 and located below the movable sleeve 4, that is, the upper end of the compression spring 6 abuts against the movable sleeve 4, and the lower end of the compression spring 6 abuts against the valve flap cover 1.

[0027] Preferably, the number of the positioning holes 22 is 3-6, and the positioning balls 3 are steel balls.

[0028] In addition, the width of the annular groove 71 is greater than the diameter of the positioning ball 3 and allows the valve stem 7 to move downward until the bottom end surface of the valve stem 7 abuts against the bottom surface of the mounting cavity 21. In this way, when the hand wheel is tightened and the valve flap cover 1 closes the water inlet on the valve seat, the valve stem 7 will directly apply a downward force to the valve flap cover 1 and will not apply a force to the positioning ball 3, which can better ensure the integrity and service life of the positioning ball 3. In addition, a first fillet 72 is provided on the outer peripheral edge of the bottom end of the valve stem 7. In this way, when the valve stem 7 is inserted into the mounting cavity 21 of the valve flap handle 2 and installed, the positioning ball 3 can be pushed to the side of the annular avoidance groove 41 more smoothly. A second fillet 73 is provided on the valve stem 7 on the outer peripheral edge of the bottom surface of the annular groove 71. In this way, when the valve stem 7 is taken out of the mounting cavity 21 of the valve flap handle 2, the positioning ball 3 can be pushed to the side of the annular avoidance groove 41 more smoothly.

[0029] A positioning groove 11 matched with the valve flap handle 2 is provided at the center of the upper end surface of the valve flap cover 1, and the valve flap handle 2 is fixedly welded in the positioning groove 11. Therefore, when the two are welded, the setting of the positioning groove 11 is conducive to quickly and accurately positioning the valve flap handle 2 on the valve flap cover 1. Preferably, the welding is laser welding.

[0030] A downwardly open cavity 25 is provided at the bottom of the valve flap handle 2 , which is beneficial to saving the material of the valve flap handle 2 while ensuring the overall structural strength of the valve flap handle 2 .

[0031] The above are only some specific implementation methods of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial changes to the utility model using this concept shall be deemed as an infringement of the protection scope of the utility model.

Claims

1. An improved fire hydrant valve flap, comprising a valve flap cover and a valve flap handle which are fixedly connected, wherein the valve flap handle is provided with an installation cavity which is open upwards and is used for inserting the lower end of the valve stem, and is characterized in that: A plurality of positioning holes communicating with the mounting cavity are evenly arranged on the outer surface of the valve flap handle along its circumferential direction, and a matching and movable positioning ball is arranged in the positioning hole, and an annular limit block is fixedly arranged on the inner surface of the positioning hole at one end close to the mounting cavity, and a partial outer surface of the positioning ball can pass through the annular limit block and be detachably clamped in the annular groove on the outer surface of the lower end of the valve stem, and a matching and movable sleeve that can slide up and down is sleeved on the valve flap handle, and a limiting portion for limiting the upward sliding of the movable sleeve is provided on the top of the valve flap handle, and an elastic member for always applying an upward elastic force to the movable sleeve and keeping the movable sleeve covering the positioning hole to limit the positioning ball is provided on the valve flap handle.

2. The improved fire hydrant valve flap according to claim 1, characterized in that: The top of the inner surface of the movable sleeve is provided with an annular avoidance groove for avoiding the positioning ball and allowing the positioning ball to completely escape from the annular groove. The bottom surface of the annular avoidance groove is inclined inwardly and downwardly and is an annular conical surface.

3. The improved fire hydrant valve flap according to claim 1, characterized in that: The limiting part is an elastic retaining spring, and an annular groove matched with the elastic retaining spring is provided on the outer surface of the top of the valve flap handle, and the elastic retaining spring is detachably clamped in the annular groove.

4. The improved fire hydrant valve flap according to claim 1, characterized in that: The elastic member is a compression spring, which is sleeved on the valve flap handle and located below the movable sleeve.

5. The improved fire hydrant valve flap according to claim 1, characterized in that: The number of the positioning holes is 3-6.

6. The improved fire hydrant valve flap according to claim 1, characterized in that: The positioning balls are steel balls.

7. The improved fire hydrant valve flap according to claim 1, characterized in that: The width of the annular groove is greater than the diameter of the positioning ball and enables the valve stem to move downward until the bottom end surface of the valve stem abuts against the bottom surface of the installation cavity.

8. The improved fire hydrant valve flap according to claim 1, characterized in that: A first rounded corner is arranged on the outer peripheral edge of the bottom end of the valve stem, and a second rounded corner is arranged on the outer peripheral edge of the bottom surface of the annular groove on the valve stem.

9. The improved fire hydrant valve flap according to claim 1, characterized in that: A positioning groove matched with the valve flap handle is provided at the center of the upper end surface of the valve flap cover, and the valve flap handle is fixedly welded in the positioning groove.

10. The improved fire hydrant valve flap according to claim 1, characterized in that: A downwardly open cavity is provided at the bottom of the valve flap handle.

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