Floating stop valve rod

Abstract

The utility model discloses a floating type stop valve rod which comprises a valve body, a valve rod assembly is arranged between an upper seal and a lower seal of the valve body, the valve rod assembly comprises a valve rod, a sealing block is arranged at the bottom of the valve rod in a sleeved mode, and the sealing block is fixed through a connecting piece. A certain relative movement space is formed, a floating type structure is formed, meanwhile, the sealing face of the valve rod is a semi-spherical face, and a self-sealing function can be achieved by being matched with a floating type sealing block: when the valve rod slightly deflects or deforms, the semi-spherical floating type structure is provided with a plurality of sealing points, the sealing position can be automatically and finely adjusted to be tightly attached to a valve body sealing line to achieve sealing; in addition, if the sealing surface is damaged in the production process, only the sealing block needs to be replaced, the valve rod does not need to be replaced, and the bad cost in production can be saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of stop valves for refrigeration equipment, in particular to a floating stop valve stem. Background Art

[0002] In the air conditioning stop valve manufacturing industry, the "wire seal" method is commonly used to cut off the air conditioning pipeline. Specifically, the valve stem is rotated clockwise until the conical surface of the valve stem thread end contacts the main cavity diameter of the valve body to form a hard seal, that is, the lower seal (fully closed state). The valve stem currently used is generally an integral structure with a conical sealing surface, which has high requirements for rigidity and machining accuracy. If the valve stem is deformed during use or the assembly size deviates, leakage is likely to occur. In addition, in the integral structure, when the valve stem sealing surface is damaged and causes leakage, the valve stem needs to be replaced as a whole, which is extremely costly. Utility Model Content

[0003] The utility model aims to provide a floating stop valve stem to solve the problems raised in the above background technology.

[0004] The technical solution adopted by the utility model is as follows:

[0005] The valve stem of a floating stop valve comprises a valve body, a valve stem assembly is arranged between the upper seal and the lower seal of the valve body, the valve stem assembly comprises a valve stem, a sealing block is sleeved at the bottom of the valve stem and fixed by a connecting piece.

[0006] Preferably, the sealing block adopts a hemispherical structure and is used to seal the lower seal of the valve body.

[0007] Preferably, the connecting member is a retaining spring or a pin.

[0008] Preferably, the valve stem and the seal on the valve body are screwed together.

[0009] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0010] In the utility model, the valve stem and the sealing block are connected and assembled using connecting parts such as retaining springs or pins, and have a certain relative movable space to form a floating structure. At the same time, the sealing surface of the valve stem is a hemispherical surface, which, together with the floating sealing block, can have a self-sealing function: when the valve stem has a slight deflection or deformation, the hemispherical floating structure has multiple sealing points, which can automatically fine-tune the sealing position to fit closely to the valve body sealing line to achieve sealing; and if the sealing surface is damaged during the production process, it is only necessary to replace the sealing block without replacing the valve stem, thereby saving bad production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the valve stem assembly structure of the utility model;

[0013] In the figure: 1. valve body; 2. valve stem assembly; 3. valve stem; 4. sealing block; 5. connecting piece. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0015] Example:

[0016] Floating stop valve stem, such as Figure 1-2 As shown, it includes a valve body 1, a valve stem assembly 2 is arranged between the upper seal and the lower seal of the valve body 1, the valve stem assembly 2 includes a valve stem 3, a sealing block 4 is sleeved on the bottom of the valve stem 3 and fixed by a connecting piece 5.

[0017] In a possible implementation manner, the sealing block 4 adopts a hemispherical structure and is used to seal the lower seal of the valve body 1 .

[0018] In a possible implementation manner, the connecting member 5 is a clip spring or a pin.

[0019] In a possible implementation manner, the valve stem 3 and the valve body 1 are sealed by threaded connection.

[0020] By adopting the above technical solution:

[0021] The valve stem assembly 2 is composed of a valve stem 3, a sealing block 4 and a connector 5. The valve stem 3 and the sealing block 4 are connected and assembled using connectors such as a retaining spring or a pin (the valve stem 3 and the sealing block 4 are designed to have an assembly structure corresponding to the connector), and have a certain relative movable space to form a floating structure. At the same time, the sealing surface of the valve stem 3 is changed from a conical surface to a hemispherical surface, and with the floating sealing block, it can have a self-sealing function: when the valve stem 3 has a slight deflection or deformation, the traditional conical surface structure has a fixed sealing point, so the sealing surface cannot be close to the valve body sealing line, resulting in leakage, while the hemispherical floating structure has multiple sealing points, which can automatically fine-tune the sealing position to close to the valve body sealing line to achieve sealing.

[0022] Working principle, see Figure 1-2 When in use, the valve stem assembly 2 is composed of three parts: a valve stem 3, a connecting piece 5 and a sealing block 4. The valve stem 3 and the sealing block 4 are connected by a connecting piece 5, which includes but is not limited to a circlip, a pin, and the like. Figure 2Taking the pin structure as an example, after the sealing block 4 is inserted into the bottom of the valve stem 3 until the groove is aligned, the pin (i.e., the connector 5) is screwed into the three threaded side holes of the sealing block 4 in turn. After the valve stem assembly 2 is assembled, the valve stem 3 and the sealing block 4 have relative movement space and cannot be fixed and stuck. At the same time, the connector 5 must ensure sufficient strength. When the valve stem assembly is rotated to the lower sealing of the valve body, the valve stem 3 pushes the sealing block 4 to the lower sealing surface. The sealing block 4 is hemispherical in shape and has multiple sealing points. When the valve stem 3 has a slight deflection or deformation, it can still be close to the valve body sealing line to achieve sealing; when the valve stem assembly is rotated upward to seal, the valve stem 3 drives the sealing block 3 to withdraw from the lower sealing surface of the valve body through the connector 5.

[0023] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Floating stop valve stem, characterized by: The invention comprises a valve body (1), wherein a valve stem assembly (2) is arranged between the upper seal and the lower seal of the valve body (1), wherein the valve stem assembly (2) comprises a valve stem (3), wherein a sealing block (4) is sleeved on the bottom of the valve stem (3) and fixed by a connecting piece (5).

2. The floating stop valve stem according to claim 1, characterized in that: The sealing block (4) adopts a hemispherical structure and is used for sealing the lower seal of the valve body (1).

3. The floating stop valve stem according to claim 1, characterized in that: The connecting piece (5) is a clip spring or a pin.

4. The floating stop valve stem according to claim 1, characterized in that: The valve stem (3) and the valve body (1) are sealed by threaded connection.

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