Adjusting pressing plate screw anti-loosening structure for butterfly valve

Abstract

The utility model discloses an adjusting pressing plate screw anti-loosening structure for a butterfly valve. The adjusting pressing plate screw anti-loosening structure comprises an adjusting pressing plate (1); the groove is formed in the adjusting pressing plate, and the groove comprises a base part and an extending part; the pressing plate screw (2) is arranged in the base part; the locking gasket (3) is located in the base part and is cylindrical, the edge of the cylindrical locking gasket is provided with two convex lugs (31) which are symmetrically distributed about the center of the cylindrical locking gasket, one convex lug is a long-strip rectangle which extends outwards and is attached to the extending part, the other convex lug covers the end part of the cylindrical locking gasket, and a through hole (32) is pre-formed in the center of the other convex lug. The beneficial effects of the utility model are that the adjusting pressing plate is provided with the grooves for placing the lugs, so that the space and performance of parts are fully utilized, materials are saved, and new parts do not need to be added; after punching, the locking gasket can be tightly attached to an inner hexagonal hole of the pressing plate screw, and the pressing plate screw is effectively prevented from rotating and loosening due to the action of external force.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve parts device especially butterfly valve is with adjusting pressure plate screw anti looseness structure. BACKGROUND

[0002] The valve of the metal or nonmetal pressure plate sealing valve seat structure such as butterfly valve, eccentric half ball valve, butterfly check valve used in large water conveyance engineering, town water supply and drainage, petroleum and petrochemical industry, after being installed to the pipeline and running for a period of time, under the joint action of medium pressure and medium flow scouring, plus the impact of impurities in raw water and sewage pipeline, the screw pre-tightened on the adjusting pressure plate can be loosened or even fall off.

[0003] Generally, the valve product will adjust the adjusting pressure plate screw to the best position during the pressure test before delivery, so that the rubber compression amount or metal sealing ring is in the best state. But the delivery transportation process and installation process will inevitably cause bumps, which will also affect the pre-tightening force of the adjusting pressure plate screw. Once the screw falls off, the valve seal will be invalid, and in serious cases, the impeller will be damaged and the machine will be stopped, which will cause great hidden troubles to people's production and life safety.

[0004] The existing structure sets a flat end locking screw on the adjusting pressure plate to form a counterforce with the pre-tightening force of the pressure plate screw, so that it remains relatively stable. But it cannot fundamentally solve the problem that the pressure plate screw will rotate after loosening. For example, the utility model patent publication number CN2320851Y discloses a square frame butterfly valve, which is composed of a valve body, a valve shaft, a butterfly plate, a body sealing ring and a plate sealing ring. The valve body and the butterfly plate are square and eccentric. The butterfly plate is in the valve body. The body sealing ring and the plate sealing ring are on the sealing surfaces of the valve body and the butterfly plate respectively. The sealing adjusting screw is connected to the butterfly plate through the pressure plate outside the butterfly plate. The patent uses a flat end locking screw on the adjusting pressure plate. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is that the existing pressure plate screw will rotate after loosening. Therefore, a butterfly valve adjusting pressure plate screw anti-looseness structure is provided.

[0006] The technical scheme of the utility model is: a butterfly valve adjusting pressure plate screw anti-looseness structure, comprising: an adjusting pressure plate; a groove, which is provided in the adjusting pressure plate, comprising a base and an extension; a pressure plate screw, which is installed in the base; a locking washer, which is located in the base and is in the shape of a cylinder, the edge of the cylinder is provided with two lugs which are symmetrically distributed about the center of the cylinder, one of the lugs is a long strip rectangle which extends outward and is in contact with the extension, and the other lug covers the end of the cylinder and has a through hole in the center.

[0007] In the above-mentioned scheme, the locking washer is in the shape of a tapered cylinder.

[0008] The locking washer in the above scheme is cylindrical.

[0009] The other lug in the above scheme is circular or rectangular.

[0010] The locking washer in the above scheme is stamped from stainless steel.

[0011] The utility model discloses the recess for placing the lug is arranged on the adjusting pressure plate, and the space and performance of part are fully utilized, and material is saved and need not increase new part, and after punching, the locking washer can be closely combined with the internal hexagonal hole of pressure plate screw, and effectively prevent the pressure plate screw from rotating loose because of the action of external force, and the locking washer is stamped, and the structure is simple and low in cost, and the reliability is high in the long -term operation pipeline, and the pressure plate screw is avoided to drop or seal failure. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the schematic diagram of the cylindrical locking washer of the utility model in use state;

[0013] Figure 2 It is the schematic diagram of another cylindrical locking washer of the utility model in open state;

[0014] Figure 3 It is the schematic diagram of the conical locking washer of the utility model in use state;

[0015] Figure 4 It is the schematic diagram of another cylindrical locking washer of the utility model in use state;

[0016] Figure 5 It is the schematic diagram of the punching rod of the utility model in use;

[0017] Figure 6 It is the schematic diagram of the dismounting rod of the utility model in use;

[0018] Figure 7 It is the schematic diagram of the installation punching of the utility model;

[0019] Figure 8 It is the schematic diagram of the dismounting of the utility model;

[0020] In the drawing, 1, adjusting pressure plate, 2, pressure plate screw, 3, locking washer, 31, lug, 32, through hole, 4, punching rod, 5, dismounting rod. DETAILED DESCRIPTION

[0021] The utility model will be further explained in connection with the drawings.

[0022] The application discloses a butterfly valve adjusting pressure plate screw anti-loosening structure, which comprises an adjusting pressure plate 1, a groove provided in the adjusting pressure plate, the groove comprising a base and an extension, a pressure plate screw 2 installed in the base, and a locking washer 3 located in the base and in a cylindrical shape, the edge of the cylindrical shape being provided with two lugs 31 symmetrically distributed about the center of the cylindrical shape, one of the lugs being a long strip-shaped rectangle extending outward and abutting against the extension, and the other lug covering the end of the cylindrical shape and being provided with a through hole 32 in the center.

[0023] Specifically, the locking washer can be a cylindrical shape as shown in the drawing, one lug abutting against the extension, and the other lug being a circular shape with a through hole in the center. Figure 1 The other lug can also be a square shape as shown in the drawing with a through hole in the center. Figure 2 The locking washer can also be a conical shape as shown in the drawing, one lug abutting against the extension, and the other lug being a circular shape with a through hole in the center. Figure 3 The other lug can also be a rectangular shape as shown in the drawing with a through hole in the center. Figure 4

[0024] During installation, the pressure plate screw is adjusted to the optimal sealing position, and then is punched and locked by a punching rod 4 so as to be matched with the hexagonal hole on the pressure plate screw. During maintenance, the inner hexagonal locking hole is pried up by a dismounting rod 5.

[0025] The adjusting pressure plate provided with the groove is manufactured by casting or machining, and the groove is located on the side of the counterbore of the pressure plate screw (an inner hexagonal screw or an inner hexagonal countersunk screw). The locking washer can be a stainless steel punching shape with a thickness of 0.75 mm.

[0026] Those skilled in the art should know that the protection scheme of the application is not limited to the above-mentioned embodiments, and various permutations, combinations and transformations can be made on the basis of the above-mentioned embodiments, and various transformations made to the application without departing from the spirit of the application all fall within the protection scope of the application.​

Claims

1. A butterfly valve regulating pressure plate screw anti-loosening structure, characterized in that: Comprising: an adjusting pressure plate (1); a groove is opened in the adjusting pressure plate, the groove comprises a base and an extension; a pressure plate screw (2) is installed in the base; a locking washer (3) is located in the base and is in a cylindrical shape, the edge of the cylindrical shape is provided with two lugs (31) which are symmetrically distributed about the center of the cylindrical shape, one of the lugs is a long strip rectangle which extends outward and is fitted with the extension, and the other lug covers the end of the cylindrical shape and is provided with a through hole (32) in the center.

2. The butterfly valve regulating pressure plate screw anti-loosening structure according to claim 1, characterized in that: The locking washer is in a conical cylindrical shape.

3. The butterfly valve regulating pressure plate screw anti-loosening structure according to claim 1, characterized in that: The locking washer is in a cylindrical shape.

4. The butterfly valve regulating pressure plate screw anti-loosening structure according to claim 1, characterized in that: The other lug is in a circular or rectangular shape.

5. The butterfly valve regulating pressure plate screw anti-loosening structure according to claim 1, characterized in that: The locking washer is stamped from stainless steel.

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