Valve rod packing sealing mechanism

Abstract

The utility model discloses a valve rod packing sealing mechanism, which relates to the technical field of valves, and comprises a valve body, a valve rod, packing and a gland, a packing cavity is formed between the valve rod and the valve body, the packing is filled in the packing cavity, the packing is formed by stacking a plurality of packing units, each packing unit comprises an inner lantern ring, an outer lantern ring, a telescopic waist drum pad and two sealing pads, the inner lantern ring and the outer lantern ring are coaxially arranged, the inner lantern ring is attached to the outer circumferential face of the valve body, the outer lantern ring is attached to the inner circumferential face of the valve body, the telescopic waist drum pad is filled between the inner lantern ring and the outer lantern ring, the section of the telescopic waist drum pad is in a waist drum shape, and the telescopic waist drum pad is pre-compressed in the direction perpendicular to the axis of the valve body. The two sealing pads are located on the upper side and the lower side of the telescopic waist drum pad respectively, and the gland is arranged on the valve body and abuts against the top end of the filler. The packing disclosed by the utility model has good wear resistance, can realize compensation and seal a gap when wear occurs, has better sealing performance, and is convenient for knowing the wear condition of the packing in time.

Description

Technical Field

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

[0002] A valve is a device used in a fluid system to control the direction, pressure and flow of a fluid. It is a device that allows the medium in pipes and equipment to flow or stop and control its flow. The valve consists of a valve body, a valve stem and a valve cover. In order to keep the moving part of the valve stem sealed in the working state, a packing must be set between the valve stem and the valve cover for sealing. The existing valve stem seal, the opening and closing rotation of the valve stem, and the disassembly and assembly of the valve cover and the valve stem will cause the contact surface between the packing and the valve stem to wear, resulting in reduced sealing. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a valve stem packing sealing mechanism, the packing of which has good wear resistance and can compensate for the closed gap when wear occurs, so that the sealing performance is better.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a valve stem packing sealing mechanism, comprising a valve body, a valve stem, a packing and a pressure cover, the valve stem is inserted into the valve body, a packing cavity is formed between the valve stem and the valve body, the packing is filled in the packing cavity, the packing is formed by stacking a plurality of packing units, the packing unit comprises an inner sleeve ring, an outer sleeve ring, a telescopic waist drum pad and two sealing pads, the inner sleeve ring is coaxially arranged with the outer sleeve ring, the inner sleeve ring is attached to the outer circumference of the valve body, the outer sleeve ring is attached to the inner circumference of the valve body, the telescopic waist drum pad is filled between the inner sleeve ring and the outer sleeve ring, the cross-sectional shape of the telescopic waist drum pad is waist drum-shaped, the telescopic waist drum pad is pre-compressed in a direction perpendicular to the axial line of the valve body, the two sealing pads are respectively located at the upper and lower sides of the telescopic waist drum pad, the pressure cover is arranged on the valve body, and the pressure cover abuts against the top of the packing.

[0005] Furthermore, the bottom of the gland is inserted into the packing cavity, and a movable pressure plate and a corrugated washer are provided at the bottom of the gland. The corrugated washer is located between the movable pressure plate and the gland, and the gland is in contact with the packing through the movable pressure plate. A plurality of guide rods are fixed on the movable pressure plate, and the guide rods pass through the corrugated washer. A guide hole is provided on the gland, and one end of the guide rod corrugated washer is passed through the guide hole.

[0006] Furthermore, one end of the guide rod passing through the pressure cover is formed with a wear indicating rod portion, and the wear indicating rod portion is provided with a scale.

[0007] Furthermore, the telescopic waist drum pad is made of rubber or polytetrafluoroethylene.

[0008] Furthermore, the inner ring is made of aramid fiber packing.

[0009] Beneficial effects of the utility model:

[0010] The utility model provides a valve stem packing sealing mechanism. When the valve stem is frequently opened and closed and rotated, causing the contact surface between the packing and the valve stem to wear, the telescopic waist drum pad will elastically stretch to press against the inner ring and the outer ring, so that the inner ring can be close to the valve stem to achieve automatic compensation and ensure the sealing effect; and the corrugated gasket will also promote further compression of the packing to make it close to the valve stem; when the packing is worn, the length of the wear indicator rod will change, so that it is convenient to timely understand the wear condition of the packing in the valve body to ensure the good working operation state of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a partial cross-sectional view of the utility model.

[0012] Figure 2 yes Figure 1 A partial enlarged view of area A in the middle.

[0013] In the figure: 1. valve body; 2. valve stem; 3. packing; 31. packing unit; 32. inner ring; 33. outer ring; 34. telescopic waist drum pad; 35. sealing gasket; 4. gland; 41. movable pressure plate; 42. corrugated washer; 43. guide rod; 431. wear indicator rod; 44. guide hole. DETAILED DESCRIPTION

[0014] The utility model is further described in detail below with reference to the accompanying drawings.

[0015] The utility model discloses a valve stem packing sealing mechanism.

[0016] Reference Figure 1 and Figure 2 A valve stem packing sealing mechanism includes a valve body 1, a valve stem 2, a packing 3 and a gland 4. The valve stem 2 is inserted into the valve body 1. A packing cavity is formed between the valve stem 2 and the valve body 1. The packing 3 is filled in the packing cavity. The packing 3 is formed by stacking a plurality of packing units 31. In this embodiment, five groups of packing units 31 are provided. The packing unit 31 includes an inner sleeve ring 32, an outer sleeve ring 33, a telescopic waist drum pad 34 and two sealing pads 35. The inner sleeve ring 32 and the outer sleeve ring 33 are coaxially arranged. The inner sleeve ring 32 and the outer sleeve ring 33 are made of aramid fiber packing, which has excellent wear resistance.

[0017] Reference Figure 1 and Figure 2, the inner sleeve 32 is fitted to the outer circumference of the valve body 1, the outer sleeve 33 is fitted to the inner circumference of the valve body 1, the telescopic waist drum pad 34 is filled between the inner sleeve 32 and the outer sleeve 33, and its two ends are respectively pressed against the inner sleeve 32 and the outer sleeve 33, and the cross-sectional shape of the telescopic waist drum pad 34 is a waist drum shape. When the packing 3 is installed in the packing cavity, the telescopic waist drum pad 34 is pre-compressed in a direction perpendicular to the axis of the valve body 1, and the two gaskets 35 are respectively located on the upper and lower sides of the telescopic waist drum pad 34, and the pressure cover 4 is arranged on the valve body 1, and the pressure cover 4 is pressed against the top of the packing 3. When the valve stem 2 is frequently opened and closed and the valve and the valve stem 2 are disassembled and assembled, resulting in wear on the contact surface between the packing 3 and the valve stem 2, the telescopic waist drum pad 34 will elastically stretch and press against the inner sleeve 32 and the outer sleeve 33, so that the inner sleeve 32 can be pressed against the valve stem 2, realizing automatic compensation and ensuring the sealing effect.

[0018] Reference Figure 1 and Figure 2 , the gland 4 is connected and fixed to the valve body 1 through a screw, the bottom of the gland 4 is inserted into the packing cavity, a movable pressure plate 41 and a corrugated washer 42 are arranged at the bottom of the gland 4, the corrugated washer 42 is located between the movable pressure plate 41 and the gland 4, the gland 4 is butted by the movable packing 3, a plurality of guide rods 43 are fixed on the movable pressure plate 41, the guide rods 43 pass through the corrugated washer 42, a guide hole 44 is opened on the gland 4, one end of the guide rod 43 and the corrugated washer 42 is penetrated in the guide hole 44. The gland 4 squeezes the packing 3 through the movable pressure plate 41, and the elastic pressure applied by the corrugated washer 42 to the movable pressure plate 41 ensures the radial pressure of the packing 3 on the valve stem 2, and the packing 3 is evenly stressed. When the packing 3 is worn, the corrugated washer 42 will also cause the packing 3 to be further compressed, so that it is tightly attached to the valve stem 2 to ensure its sealing effect. In addition, a wear indicator rod 431 is formed at one end of the guide rod 43 passing through the pressure cover 4, and a scale is set on the wear indicator rod 431. When the packing 3 is worn, the length of the wear indicator rod 431 changes, so that it is convenient to timely understand the wear condition of the packing 3 in the valve body 1 to ensure that the valve body 1 is in a good working condition.

[0019] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A valve stem packing sealing mechanism, comprising a valve body (1), a valve stem (2), a packing (3) and a gland (4), wherein the valve stem (2) is inserted into the valve body (1), a packing cavity is formed between the valve stem (2) and the valve body (1), and the packing (3) is filled in the packing cavity, characterized in that: The packing (3) is formed by stacking a plurality of packing units (31), wherein the packing unit (31) comprises an inner sleeve ring (32), an outer sleeve ring (33), a telescopic waist drum pad (34) and two sealing pads (35), wherein the inner sleeve ring (32) and the outer sleeve ring (33) are coaxially arranged, wherein the inner sleeve ring (32) is in contact with the outer circumference of the valve body (1), wherein the outer sleeve ring (33) is in contact with the inner circumference of the valve body (1), wherein the telescopic waist drum pad (34) is filled between the inner sleeve ring (32) and the outer sleeve ring (33), wherein the cross-sectional shape of the telescopic waist drum pad (34) is a waist drum shape, wherein the telescopic waist drum pad (34) is pre-compressed in a direction perpendicular to the axis of the valve body (1), wherein the two sealing pads (35) are respectively located on the upper and lower sides of the telescopic waist drum pad (34), wherein the pressure cover (4) is arranged on the valve body (1), wherein the pressure cover (4) is in contact with the top end of the packing (3).

2. A valve stem packing sealing mechanism according to claim 1, characterized in that: The bottom of the pressure cover (4) is inserted into the packing cavity. A movable pressure plate (41) and a corrugated gasket (42) are provided at the bottom of the pressure cover (4). The corrugated gasket (42) is located between the movable pressure plate (41) and the pressure cover (4). The pressure cover (4) is in contact with the packing (3) through the movable pressure plate (41). A plurality of guide rods (43) are fixed on the movable pressure plate (41). The guide rods (43) pass through the corrugated gasket (42). A guide hole (44) is provided on the pressure cover (4). One end of the guide rod (43) and the corrugated gasket (42) are passed through the guide hole (44).

3. A valve stem packing sealing mechanism according to claim 2, characterized in that: A wear indicating rod portion (431) is formed at one end of the guide rod (43) passing through the pressure cover (4), and a scale is provided on the wear indicating rod portion (431).

4. A valve stem packing sealing mechanism according to any one of claims 1 to 3, characterized in that: The telescopic waist drum pad (34) is made of rubber or polytetrafluoroethylene.

5. A valve stem packing sealing mechanism according to any one of claims 1 to 3, characterized in that: The inner sleeve ring (32) is made of aramid fiber packing.

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