A valve stem seal structure and gate valve

Abstract

This invention relates to the field of valve stem sealing technology, specifically a valve stem sealing structure and a gate valve, including an installation sleeve fitted onto the top of the gate valve body. A valve stem is screwed to the top of the gate valve, and a handle wheel is fitted onto the top of the valve stem. A telescopic bellows is fixed to the top of the installation sleeve, and a connecting ring is fixed to the top of the telescopic bellows. A connecting ring is rotatably connected to the top of the connecting ring, and the connecting ring is fixed to the bottom surface of the handle wheel by screws. A threaded interface is provided on the surface of the connecting ring. The beneficial effects are: through the cooperation of the rubber clamping ring, clamping block, and limiting ring, a stable locking position is formed between the installation sleeve and the valve body, effectively preventing the installation sleeve from falling off. Furthermore, the elastic hanging plate and locking strip design of the limiting ring achieves reliable anti-detachment limiting; the sealing and protective structure composed of the telescopic bellows and related components can protect the area where the valve stem extends out of the valve body, preventing external dust adhesion.

Description

Technical Field

[0001] This invention relates to the field of valve stem seals, specifically a valve stem sealing structure and a gate valve. Background Technology

[0002] In existing gate valve structures, there are certain deficiencies in the sealing between the valve stem and the valve body, as well as in the fixing method of the mounting sleeve. On the one hand, the traditional connection method between the mounting sleeve and the valve body may not be stable enough. During valve use, the mounting sleeve is prone to falling off the valve body due to vibration, external forces, or other factors, affecting the normal use and sealing performance of the valve.

[0003] On the other hand, there is a lack of effective measures for sealing and protecting the part of the valve stem that extends out of the valve body. External dust and impurities can easily adhere to the valve stem, which not only affects the flexibility of the valve stem's rotation, but may also accelerate the wear of the valve stem and related components, reduce the service life of the valve, and increase the maintenance cost and workload of the valve. Summary of the Invention

[0004] The purpose of this invention is to provide a valve stem sealing structure and a gate valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a valve stem sealing structure, comprising an installation sleeve, the installation sleeve being fitted onto the top of the valve body of a gate valve, a valve stem being screwed to the top of the gate valve, a handle wheel being fitted onto the top of the valve stem, a telescopic bellows being fixed to the top of the installation sleeve, a connecting ring being fixed to the top of the telescopic bellows, a connecting ring being rotatably connected to the top of the connecting ring, the connecting ring being fixed to the bottom surface of the handle wheel by screws, and a threaded interface being provided on the surface of the connecting ring.

[0006] Preferably, a rubber clamp is fixed to the inner wall of the mounting sleeve, and the rubber clamp is elastically deformed between the top of the valve body of the gate valve and the mounting sleeve.

[0007] Preferably, the bottom end of the mounting sleeve has a reserved groove on the outer ring surface. The reserved groove is annular and has multiple insertion holes on its surface. A clamping block is inserted into the insertion hole. The length of the clamping block is greater than the depth of the insertion hole. One end of the clamping block is fixed to the outer ring surface of the rubber clamping ring, and the other end of the clamping block has an inclined surface on its bottom surface.

[0008] Preferably, a limiting ring is fitted inside the reserved groove, and the limiting ring pushes the clamping block into the second slot opened at the top of the valve body of the gate valve. A rubber retaining ring is fitted and fixed at the bottom of the reserved groove, and the outer diameter of the rubber retaining ring is larger than the inner ring diameter of the limiting ring.

[0009] Preferably, two elastic hanging pieces are fixed on the outer ring surface of the limiting ring. The two elastic hanging pieces are symmetrically distributed about the limiting ring. The top of the elastic hanging pieces is fixed with a retaining strip on the inner ring surface. The retaining strip is an arc strip with a right-angled trapezoidal end face. The retaining strip is inserted into a retaining groove one opened on the outer ring surface of the mounting sleeve. The retaining groove one is an annular groove. The height of the retaining groove one is greater than the height of the retaining strip.

[0010] Preferably, the surface of the connecting ring is provided with multiple pressure relief holes, and a plug is inserted and screwed into the screw interface.

[0011] Preferably, the top surface of the connecting ring has a notch, which is a convex annular groove. A connecting ring is inserted into the notch, which is a convex ring plate. The top end of the connecting ring is fixed to the bottom surface of the connecting ring.

[0012] A gate valve, including a stem sealing structure.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The valve stem sealing structure and gate valve proposed in this invention form a stable locking position between the mounting sleeve and the valve body through the cooperation of the rubber clamping ring, clamping block, and limiting ring, effectively preventing the mounting sleeve from falling off. The elastic hanging piece and locking strip design of the limiting ring achieves reliable anti-disengagement limiting. The sealing and protection structure composed of the telescopic bellows and related components can protect the area where the valve stem extends out of the valve body, prevent external dust from adhering, ensure flexible valve stem rotation, reduce component wear, extend valve service life, reduce maintenance costs, and improve the overall performance and reliability of the valve. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Sectional view of the structure at point AA; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point B; Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point C; Figure 5 This is a schematic diagram of the telescopic corrugated pipe structure of the present invention; Figure 6 This is a schematic diagram of the connecting ring structure of the present invention; Figure 7 This is a schematic diagram of the mounting sleeve structure of the present invention.

[0015] In the diagram: 1. Installation sleeve, 101. Rubber clamping ring, 102. Reserved groove, 103. Insertion hole, 104. Rubber retaining ring, 105. Slot 1, 2. Gate valve, 201. Slot 2, 3. Clamping block, 4. Limiting ring, 401. Elastic hanging piece, 402. Clip, 5. Telescopic corrugated pipe, 6. Connecting ring, 601. Notched groove, 602. Plug, 603. Pressure relief hole, 604. Connecting ring, 7. Connecting ring, 701. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-7 This invention provides a technical solution: a valve stem sealing structure, including an installation sleeve 1, which is fitted onto the top of the valve body of a gate valve 2. A rubber clamping ring 101 is fixed to the inner wall of the installation sleeve 1, and the rubber clamping ring 101 is elastically deformed between the top of the valve body of the gate valve 2 and the installation sleeve 1. A valve stem is screwed to the top of the gate valve 2, and a handle wheel is fitted onto the top of the valve stem. A reserved groove 102 is formed on the outer circumferential surface of the bottom end of the installation sleeve 1. The reserved groove 102 is an annular groove, and multiple grooves are formed on the surface of the reserved groove 102. The insertion hole 103 has a clamping block 3 inserted inside it. The length of the clamping block 3 is greater than the depth of the insertion hole 103. One end of the clamping block 3 is fixed to the outer ring surface of the rubber clamping ring 101, and the other end of the clamping block 3 has an inclined surface on the bottom surface. A limiting ring 4 is fitted inside the reserved groove 102. The limiting ring 4 pushes the clamping block 3 into the second slot 201 opened at the top of the valve body of the gate valve 2. A rubber retaining ring 104 is fitted and fixed at the bottom of the reserved groove 102. The outer diameter of the rubber retaining ring 104 is greater than the inner ring diameter of the limiting ring 4.

[0018] Before the handle wheel is installed, the mounting sleeve 1 is placed on the valve stem and pushed down to fasten the mounting sleeve 1 to the top of the valve body. Then, the limiting ring 4 is pushed upward, and the limiting ring 4 pushes multiple clamping blocks 3 into the second slot 201, forming a locking position between the mounting sleeve 1 and the valve body to prevent the mounting sleeve 1 from falling off the valve body. When the limiting ring 4 is pulled out from the reserved slot 102, the rubber clamping ring 101 rebounds, causing the clamping blocks 3 to return to the insertion hole 103, that is, the clamping blocks 3 are pulled out from the second slot 201, and the locking position between the mounting sleeve 1 and the valve body is removed.

[0019] To prevent the limiting ring 4 from detaching when it is at the bottom of the mounting sleeve 1, the following was proposed: Two elastic hanging pieces 401 are fixed on the outer ring surface of the limit ring 4. The two elastic hanging pieces 401 are symmetrically distributed about the limit ring 4. At the top end of the elastic hanging piece 401, a clamping strip 402 is fixed on the inner ring surface. The clamping strip 402 is an arc strip with a right trapezoid end face. The clamping strip 402 is inserted into a first clamping groove 105 opened on the outer ring surface of the mounting sleeve 1. The first clamping groove 105 is an annular groove, and the height of the first clamping groove 105 is greater than the height of the clamping strip 402. When the limit ring 4 is sleeved on the reserved groove 102, the clamping strip 402 is inserted into the first clamping groove 105, and the clamping strip 402 prevents the limit ring 4 from falling off by pulling through the elastic hanging piece 401.

[0020] In order to achieve the sealing protection of the valve stem, it is proposed that: A telescopic bellows 5 is fixed on the top of the mounting sleeve 1. The top of the telescopic bellows 5 is fixed with a connecting ring 6. The top end of the connecting ring 6 is rotatably connected with a connecting ring 7. The connecting ring 7 is fixed on the bottom surface of the handle wheel by screws. A screw interface 602 is opened on the surface of the connecting ring 7; A plurality of pressure relief fine holes 604 are opened on the surface of the connecting ring 6. A plug 603 is inserted and screwed inside the screw interface 602; A notch 601 is opened on the top surface of the connecting ring 6. The notch 601 is a "convex" - shaped annular groove. An adapter ring 701 is inserted into the notch 601. The adapter ring 701 is a "convex" - shaped ring plate. The top end of the adapter ring 701 is fixed on the bottom surface of the connecting ring 7.

[0021] After the mounting sleeve 1 is installed on the top of the valve body and the connecting ring 7 is fixed at the bottom of the handle wheel, the telescopic bellows 5 encloses the area where the valve stem extends out of the valve body, preventing external dust from adhering to the valve stem. When turning the handle wheel, one hand pinches the connecting ring 6 and the other hand operates the handle wheel.

[0022] The detailed usage method of this valve stem sealing structure: Before the handle wheel is installed, the mounting sleeve 1 is placed on the valve stem of the gate valve 2, and the mounting sleeve 1 is pushed downwards to fasten it to the top of the valve body of the gate valve 2. At this time, the rubber clamping ring 101 fixed on the inner wall of the mounting sleeve 1 is clamped between the top of the valve body of the gate valve 2 and the mounting sleeve 1, and undergoes elastic deformation. The bottom end of the mounting sleeve 1 has a reserved groove 102 on the outer ring surface, and multiple insertion holes 103 are opened on the surface of the reserved groove 102. A clamping block 3 is inserted into the insertion hole 103, and the length of the clamping block 3 is greater than the depth of the insertion hole 103. One end of the clamping block 3 is fixed to the outer ring surface of the rubber clamping ring 101, and the other end has a bevel on the bottom surface. Pushing the limiting ring 4 upwards, the limiting ring 4 moves in the reserved groove 102, pushing the multiple clamping blocks 3, so that the clamping blocks 3 are inserted into the second slot 201 opened on the top of the valve body of the gate valve 2, forming a locking position between the mounting sleeve 1 and the valve body, preventing the mounting sleeve 1 from falling off the valve body. Two elastic hanging pieces 401 are fixed to the outer ring surface of the limiting ring 4. The two elastic hanging pieces 401 are symmetrically distributed about the limiting ring 4. The top of the elastic hanging pieces 401 is fixed with a retaining strip 402 on the inner ring surface. The retaining strip 402 is an arc strip with a right-angled trapezoidal end face. After the limiting ring 4 is fitted into the reserved groove 102, the retaining strip 402 is inserted into the retaining groove 105 opened on the outer ring surface of the mounting sleeve 1. The retaining groove 105 is an annular groove and its height is greater than the height of the retaining strip 402. The retaining strip 402 pulls the limiting ring 4 through the elastic hanging pieces 401 to achieve the anti-detachment limiting of the limiting ring 4. A telescopic corrugated pipe 5 is fixed to the top of the mounting sleeve 1. A connecting ring 6 is fixed to the top of the telescopic corrugated pipe 5. A connecting ring 7 is rotatably connected to the top of the connecting ring 6. The connecting ring 7 is fixed to the bottom of the handle wheel with screws. The surface of the connecting ring 7 has a screw interface 602, and the surface of the connecting ring 6 has multiple pressure relief holes 604. A plug 603 is inserted and screwed into the screw interface 602. The top surface of the connecting ring 6 has a notch 601, which is a U-shaped annular groove. The connecting ring 701 (which is a U-shaped annular plate with its top fixed to the bottom surface of the connecting ring 7) is inserted into the notch 601, completing the installation of the telescopic bellows 5 and related components. After the mounting sleeve 1 is installed on the top of the valve body and the connecting ring 7 is fixed to the bottom of the handle wheel, the telescopic bellows 5 surrounds the area where the valve stem extends out of the valve body, preventing external dust from adhering to the valve stem. When turning the handle wheel, one hand holds the connecting ring 6, and the other hand operates the handle wheel to open or close the valve. When it is necessary to remove the mounting sleeve 1, the limiting ring 4 is pulled out from the reserved groove 102. At this time, the rubber clamping ring 101 rebounds, causing the clamping block 3 to return to the insertion hole 103. That is, the clamping block 3 is pulled out from the second slot 201, and the locking between the mounting sleeve 1 and the valve body is removed, so that the mounting sleeve 1 can be removed from the valve body.

[0023] Example 2, based on Example 1, proposes a gate valve, characterized in that it includes the valve stem sealing structure described in any one of claims 1-7.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve stem sealing structure, comprising a mounting sleeve (1) sleeved on the top of a valve body of a gate valve (2), a valve stem being screwed on the top end of the gate valve (2), and a handle wheel being sleeved on the top end of the valve stem, characterized in that: The top of the mounting sleeve (1) is fixed with a telescopic corrugated tube (5), the top of the telescopic corrugated tube (5) is fixed with a connecting ring (6), the top of the connecting ring (6) is rotatably connected with a connecting ring (7), the connecting ring (7) is fixed to the bottom surface of the handle wheel by screws, and the surface of the connecting ring (7) is provided with a screw interface (602).

2. A valve stem seal assembly as defined in claim 1, wherein: The inner wall of the mounting sleeve (1) is fixed with a rubber clamp (101), which is held between the top of the valve body of the gate valve (2) and the mounting sleeve (1) and undergoes elastic deformation.

3. A valve stem seal assembly as defined in claim 2, wherein: The bottom end of the mounting sleeve (1) has a reserved groove (102) on the outer ring surface. The reserved groove (102) is an annular groove. Multiple insertion holes (103) are opened on the surface of the reserved groove (102). A clamping block (3) is inserted into the insertion hole (103). The length of the clamping block (3) is greater than the depth of the insertion hole (103). One end of the clamping block (3) is fixed to the outer ring surface of the rubber clamping ring (101). The other end of the clamping block (3) has an inclined surface on the bottom surface.

4. A valve stem seal assembly as defined in claim 3, wherein: The reserved groove (102) is fitted with a limiting ring (4), which pushes the clamping block (3) into the slot two (201) opened on the top of the valve body of the gate valve (2). A rubber retaining ring (104) is fitted and fixed at the bottom of the reserved groove (102), and the outer diameter of the rubber retaining ring (104) is larger than the inner ring diameter of the limiting ring (4).

5. The valve stem sealing structure according to claim 4, characterized in that: Two elastic hanging pieces (401) are fixed on the outer ring surface of the limiting ring (4). The two elastic hanging pieces (401) are symmetrically distributed about the limiting ring (4). The top of the elastic hanging piece (401) is fixed with a retaining strip (402) on the inner ring surface. The retaining strip (402) is an arc strip with a right-angled trapezoidal end face. The retaining strip (402) is inserted into the retaining groove (105) opened on the outer ring surface of the mounting sleeve (1). The retaining groove (105) is an annular groove. The height of the retaining groove (105) is greater than the height of the retaining strip (402).

6. The valve stem sealing structure according to claim 1, characterized in that: The surface of the connecting ring (6) is provided with multiple pressure relief holes (604), and a plug (603) is inserted and screwed into the screw interface (602).

7. The valve stem sealing structure according to claim 1, characterized in that: The top surface of the connecting ring (6) is provided with a notch (601), which is a "convex" shaped annular groove. A connecting ring (701) is inserted into the notch (601), which is a "convex" shaped ring plate. The top of the connecting ring (701) is fixed to the bottom surface of the connecting ring (7).

8. A gate valve, characterized in that: Includes the valve stem sealing structure described in any one of claims 1-7.

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