Valve rod sealing structure

Abstract

The utility model discloses a valve rod sealing structure which comprises a valve shell, a valve rod and a sealing piece, and the valve rod is made of stainless steel materials. A through hole allowing the valve rod to penetrate through is formed in the middle of the valve shell, the valve rod is rotationally connected to the middle of the valve shell, and when the valve rod is in a working state, the axial relative position of the valve rod and the valve shell is kept unchanged; the valve rod is provided with a sealing shaft section for a sealing piece to be arranged in a sleeved mode, and the outer wall face of the sealing shaft section is a complete cylindrical face without a groove. The inner side and the outer side of the sealing piece are connected with the outer wall face of the sealing shaft section and the inner wall of the valve shell in a sealed mode respectively, and the upper end of the sealing piece abuts against the portion, on the periphery of the through hole, of the valve shell. Compared with the prior art, the sealing piece is arranged between the sealing shaft section with the complete cylindrical surface and the inner wall of the valve shell, a sealing groove does not need to be machined on the valve rod, machining is simpler, tool abrasion is reduced, and production cost is low.

Description

Technical Field

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

[0002] The existing valve core mechanism includes a static plate, a sealing ring, a rotating core composed of a valve core rod and a moving plate, and other auxiliary structures. In order to ensure sealing, a sealing structure such as a sealing ring needs to be arranged outside the valve core rod; for example, Chinese patent CN106969161A forms a plurality of mounting grooves on the valve stem, and a sealing ring is arranged in the mounting groove; stainless steel is increasingly widely used in the sanitary ware field because of its low material cost and corrosion resistance, but stainless steel is difficult to cut and the tool for cutting grooves on the valve stem wears a lot, which greatly increases the processing cost.

[0003] In view of this, the inventor conducted in-depth research on the above-mentioned defects in the prior art, and thus came up with this case. Utility Model Content

[0004] The main purpose of the utility model is to provide a valve stem sealing structure, which can achieve the sealing of the valve stem without grooving the outer side wall of the valve stem and has the characteristic of low production cost.

[0005] In order to achieve the above purpose, the solution of the utility model is:

[0006] A valve stem sealing structure, which includes a valve housing, a valve stem and a sealing member, wherein the valve stem is made of stainless steel; a through hole is provided in the middle of the valve housing for the valve stem to pass through, the valve stem is rotatably connected to the middle of the valve housing, the valve stem has a sealing shaft section for the sealing member to be sleeved, and the outer wall surface of the sealing shaft section is a complete cylindrical surface without a groove; the inner and outer sides of the sealing member are respectively sealedly connected to the outer wall surface of the sealing shaft section and the inner wall of the valve housing.

[0007] Furthermore, the upper end of the sealing member abuts against the valve housing at the periphery of the through hole.

[0008] Furthermore, when the valve stem is in a working state, the axial relative position of the valve stem and the valve housing remains unchanged.

[0009] Furthermore, the sealing member includes a first sealing ring and a second sealing ring, and a spacer ring is arranged between the first sealing ring and the second sealing ring.

[0010] Furthermore, the sealing member is a sealing sleeve made of rubber or silicone.

[0011] Furthermore, a first step is formed on the inner wall of the valve housing, a second step is formed on the valve stem below the sealing shaft section, a gasket is provided between the first step and the second step, the gasket is sleeved on the sealing shaft section, and the upper end of the gasket abuts against the seal.

[0012] Furthermore, the gasket is made of plastic.

[0013] Furthermore, the outer wall of the valve housing has an external thread, and the sealing member is sealingly connected to the inner wall of the valve housing above the external thread.

[0014] After adopting the above structure, the valve stem sealing structure of the utility model has at least the following beneficial effects:

[0015] 1. By setting the sealing sleeve on the sealing shaft section without groove, there is no need to process the sealing groove on the valve stem, making the stainless steel valve stem processing more convenient, avoiding burrs during the sealing groove processing and reducing the wear of the tool. The sealing sleeve is set outside the sealing shaft section and is sealed and connected to the inner wall of the valve housing to ensure the sealing effect.

[0016] Second, the seal can be a single-layer sealing sleeve structure, or a multi-layer sealing structure consisting of a first sealing ring and a second sealing ring, and the spacer ring plays a role in positioning and separation. Furthermore, the gasket is arranged between the first step and the second step to ensure smooth rotation between the valve stem and the valve housing, and the gasket can also limit the position of the lower end of the seal.

[0017] Compared with the prior art, the utility model arranges the seal between the sealing shaft section with a complete cylindrical surface and the inner wall of the valve housing, and there is no need to process a sealing groove on the valve stem, so the processing is simpler, the tool wear is reduced, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a three-dimensional structural schematic diagram of a valve stem sealing structure.

[0019] Figure 2 It is a cross-sectional structural schematic diagram of the utility model.

[0020] In the figure:

[0021] Valve housing 1; through hole 11; first step 12; external thread 13; valve stem 2; sealing shaft section 21; second step 22; sealing member 3; first sealing ring 31; second sealing ring 32; spacer ring 33; gasket 4; moving plate 5; stationary plate 6. DETAILED DESCRIPTION

[0022] In order to further explain the technical solution of the present utility model, the present utility model is described in detail below through specific embodiments.

[0023] like Figure 1 to Figure 2As shown, it is a valve stem 2 sealing structure involved in the utility model, including a valve housing 1, a valve stem 2 and a sealing member 3, the valve stem 2 is made of stainless steel; the middle part of the valve housing 1 has a through hole 11 for the valve stem 2 to pass through, the valve stem 2 is rotatably connected to the middle part of the valve housing 1, and when the valve stem 2 is in a working state, the axial relative position of the valve stem 2 and the valve housing 1 remains unchanged; the valve stem 2 has a sealing shaft section 21 for the sealing member 3 to be sleeved, and the outer wall surface of the sealing shaft section 21 is a complete cylindrical surface without grooves; the inner and outer sides of the sealing member 3 are respectively sealedly connected with the outer wall surface of the sealing shaft section 21 and the inner wall of the valve housing 1, and the upper end of the sealing member 3 abuts against the valve housing 1 outside the through hole 11. By driving the valve stem 2 to rotate relative to the valve housing 1, the valve stem 2 drives the moving plate 5 below the valve stem 2 to rotate relative to the static plate 6, thereby realizing the switching of opening and closing of the waterway.

[0024] By sleeve-arranging the seal 3 on the grooveless sealing shaft section 21, it is not necessary to machine the sealing groove on the valve stem 2, making it easier to machine the stainless steel valve stem 2, avoiding burrs during the machining of the sealing groove and reducing tool wear. The seal 3 is sleeved outside the sealing shaft section 21 and is sealed and connected to the inner wall of the valve housing 1 to ensure a sealing effect.

[0025] Preferably, the sealing member 3 comprises a first sealing ring 31 and a second sealing ring 32, wherein a spacer ring 33 is disposed between the first sealing ring 31 and the second sealing ring 32. The first sealing ring 31 and the second sealing ring 32 form a multi-layer sealing structure, and the spacer ring 33 plays a role of positioning and separation.

[0026] Preferably, the sealing member 3 is a sealing sleeve made of rubber or silicone material. The sealing sleeve forms a single-layer sealing structure, which reduces the number of parts and facilitates assembly.

[0027] Preferably, a first step 12 is formed on the inner wall of the valve housing 1, a second step 22 is formed on the valve stem 2 below the sealing shaft section 21, a gasket 4 is provided between the first step 12 and the second step 22, the gasket 4 is sleeved on the sealing shaft section 21, and the upper end of the gasket 4 abuts against the sealing member 3. Further, the gasket 4 is made of plastic material. The gasket 4 is provided between the first step 12 and the second step 22, and plays a role in ensuring smooth rotation between the valve stem 2 and the valve housing 1, and the gasket 4 can also play a role in limiting the lower end position of the sealing member 3. Preferably, the outer wall of the valve housing 1 has an external thread 13, and the sealing member 3 is sealed and connected to the inner wall of the valve housing 1 above the external thread 13.

[0028] Compared with the prior art, the utility model arranges the sealing member 3 between the sealing shaft section 21 with a complete cylindrical surface and the inner wall of the valve housing 1, eliminating the need to machine a sealing groove on the valve stem 2, making the machining simpler, reducing tool wear and reducing production costs.

[0029] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A valve stem sealing structure, characterized in that: It includes a valve housing, a valve stem and a sealing member, wherein the valve stem is made of stainless steel; a through hole is provided in the middle of the valve housing for the valve stem to pass through, the valve stem is rotatably connected to the middle of the valve housing, the valve stem has a sealing shaft section for the sealing member to be sleeved, and the outer wall surface of the sealing shaft section is a complete cylindrical surface without a groove; the inner and outer sides of the sealing member are respectively sealedly connected to the outer wall surface of the sealing shaft section and the inner wall of the valve housing.

2. A valve stem sealing structure according to claim 1, characterized in that: The upper end of the sealing member abuts against the valve housing at the periphery of the through hole.

3. A valve stem sealing structure according to claim 1, characterized in that: When the valve stem is in working state, the axial relative position of the valve stem and the valve housing remains unchanged.

4. A valve stem sealing structure according to claim 1, characterized in that: The sealing member comprises a first sealing ring and a second sealing ring, wherein a spacer ring is arranged between the first sealing ring and the second sealing ring.

5. A valve stem sealing structure according to claim 1, characterized in that: The sealing member is a sealing sleeve made of rubber or silicone.

6. A valve stem sealing structure according to any one of claims 1 to 5, characterized in that: A first step is formed on the inner wall of the valve housing, a second step is formed on the valve stem below the sealing shaft section, a gasket is provided between the first step and the second step, the gasket is sleeved on the sealing shaft section, and the upper end of the gasket abuts against the sealing member.

7. A valve stem sealing structure according to claim 6, characterized in that: The gasket is made of plastic material.

8. A valve stem sealing structure according to claim 1, characterized in that: The outer wall of the valve housing has an external thread, and the sealing member is sealed and connected to the inner wall of the valve housing above the external thread.

Images