A valve stem and valve disc connection structure and a ball valve including the same.

Abstract

This utility model discloses a valve stem and valve disc connection structure and a ball valve including the same. The valve stem and valve disc connection structure includes a valve stem body, a valve disc sleeve, and a valve disc core. The valve disc sleeve has a first end and a second end opposite to each other, and has an accommodating space penetrating the first end and the second end. The valve stem body extends into the accommodating space of the valve disc sleeve through the first end. The valve disc core is installed at the second end of the valve disc sleeve and at least partially extends into the accommodating space to press the valve stem body against the valve disc sleeve. The valve disc core and the second end of the valve disc sleeve are fixedly connected by welding. This utility model can solve the problems of low structural strength and complex processing of traditional valve disc and valve stem separate connection structures using threaded sleeves or T-groove hooks.

Description

Technical Field

[0001] This utility model relates to the field of ball valves, specifically to a valve stem and valve disc connection structure and a ball valve containing the same. Background Technology

[0002] Ball valves mainly include gate valves, gate check valves, bellows gate valves, single-seat control valves, and sleeve control valves. Ball valves can be used to control the flow of various types of fluids, such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media.

[0003] Traditional ball valves have a stem diameter much smaller than the disc diameter, and are generally manufactured as separate parts to save on raw material costs. During valve operation, the stem and disc must move up and down together, and ideally, there should be a small amount of clearance between them to compensate for accumulated errors and ensure a more effective seal. Therefore, there are many connection methods for the stem and disc, the most common being threaded sleeve connections and T-slot hook connections. However, threaded sleeve connections require precision threads to be machined inside the disc, which are prone to loosening and failure due to vibration or frequent opening and closing. While T-slot hook connections prevent rotation, they require milling complex grooves at the stem end, resulting in high processing costs and stress concentration that can easily lead to breakage. Utility Model Content

[0004] The present invention aims to solve the above-mentioned technical problems, namely, the traditional valve disc and valve stem using a separate connection structure with threaded sleeve or T-groove hook has the problems of low structural strength and complicated processing.

[0005] In a first aspect, the present invention provides a valve stem and valve disc connection structure, including a valve stem body, a valve disc sleeve, and a valve disc core. The valve disc sleeve has a first end and a second end opposite to each other, and the valve disc sleeve has an accommodating space passing through the first end and the second end. The valve stem body extends into the accommodating space of the valve disc sleeve through the first end. The valve disc core is installed at the second end of the valve disc sleeve and at least partially extends into the accommodating space to press the valve stem body against the valve disc sleeve. The valve disc core and the second end of the valve disc sleeve are fixedly connected by welding.

[0006] In the preferred embodiment of the valve stem and valve disc connection structure described above, the second end of the valve disc sleeve has a first weld overlay surface, and the valve disc core has a second weld overlay surface on its circumferential surface that does not extend into the valve disc sleeve.

[0007] In the preferred embodiment of the valve stem and valve disc connection structure described above, the end of the valve disc core that does not extend into the valve disc sleeve is provided with a chamfer, so that the valve disc core forms a weld overlay slope adjacent to the second weld overlay surface at the chamfer.

[0008] In the preferred embodiment of the valve stem and valve disc connection structure described above, the second end of the valve disc sleeve is provided with a concave stepped layer, and the outer periphery of the valve disc core is formed with a protrusion that matches the stepped layer, so that when the valve disc core enters the accommodating space of the valve disc sleeve and is in a static position, the protrusion abuts against the stepped layer.

[0009] In the preferred embodiment of the valve stem and valve disc connection structure described above, the valve disc core has a groove at one end that extends into the valve disc sleeve, and a thrust pad for abutting against the valve stem body is installed in the groove.

[0010] In the preferred embodiment of the valve stem and valve disc connection structure described above, the valve disc core has a first slot at one end extending into the valve disc sleeve, and the valve stem body has a second slot at the first end extending into the valve disc sleeve. Limiting pins are installed in the first slot and the second slot.

[0011] In the preferred embodiment of the above-mentioned valve stem and valve disc connection structure, the thrust pad is made of stainless steel, copper alloy or hard plastic.

[0012] In a second aspect, the present invention also provides a ball valve, which includes the above-mentioned valve stem and valve disc connection structure.

[0013] The beneficial effects of this utility model are: by connecting the valve disc core and the valve disc sleeve by overlay welding, the valve stem body is pressed against the valve disc sleeve, so that the valve stem body, valve disc sleeve, and valve disc core are integrally connected, preventing the valve stem body and valve disc core from rotating, enhancing the connection strength between the valve stem body and the valve disc sleeve and valve disc core, improving the overall performance of the valve stem assembly, reducing assembly costs, and making it practical. Attached Figure Description

[0014] Figure 1 This is the front view of the present invention;

[0015] Figure 2 This is a front view of the valve disc core;

[0016] Figure 3 This is a schematic diagram of the first weld bead, the second weld bead, and the weld bead slope.

[0017] In the figure: valve stem body 1, second slot 11, valve disc sleeve 2, first end 21, second end 22, accommodating space 23, eaves 24, stepped layer 25, valve disc core 3, protrusion 31, groove 32, first slot 33, first weld overlay surface 41, second weld overlay surface 42, weld overlay slope 43, thrust pad 5, limit pin 6. Detailed Implementation

[0018] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0019] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] See Figures 1 to 3 The valve stem and valve disc connection structure of this utility model includes a valve stem body 1, a valve disc sleeve 2, and a valve disc core 3. The valve disc sleeve 2 has a first end 21 and a second end 22, which are opposite each other. The valve disc sleeve 2 has an accommodating space 23 that passes through the first end 21 and the second end 22. The valve stem body 1 extends into the accommodating space 23 of the valve disc sleeve 2 through the first end 21. The valve disc core 3 is installed on the second end 22 of the valve disc sleeve 2 and extends at least partially into the accommodating space 23 to press the valve stem body 1 against the valve disc sleeve 2. The valve disc core 3 and the second end 22 of the valve disc sleeve 2 are fixedly connected by welding.

[0022] See Figure 1 The valve disc sleeve 2 has an eave 24 extending towards its axis at its first end 21. The inner diameter of the eave 24 is the same as the outer diameter of the stem of the valve stem body 1. The inner diameter of the eave 24 is smaller than the inner diameter of the accommodating space 23, so that after the valve stem body 1 enters the accommodating space 23 through the first end 21 of the valve disc sleeve 2, the valve stem body 1 can be restricted along the axial direction. The valve disc core 3 is installed on the second end 22 of the valve disc sleeve 2 to press the valve stem body 1 against the eave 24 of the valve disc sleeve 2. Then, the second end 22 of the valve disc sleeve 2 and the peripheral side of the valve disc core 3 are welded by overlay welding to realize the connection between the valve stem body 1 and the valve disc. Through this setting, the valve stem body 1 can be integrated with the valve disc sleeve 2 and the valve disc core 3, while reducing the possibility of rotation of the valve stem body 1 and the valve disc core 3. At the same time, the overlay welding method can effectively improve the connection strength of the three, improve the overall performance of the valve stem assembly, reduce the assembly cost, and make it practical.

[0023] In one or more embodiments, the second end 22 of the valve disc sleeve 2 has a first weld overlay surface 41, and the circumferential surface of the valve disc core 3 that does not extend into the valve disc sleeve 2 is a second weld overlay surface 42; the end of the valve disc core 3 that does not extend into the valve disc sleeve 2 is provided with a chamfer, so that the valve disc core 3 forms a weld overlay slope 43 adjacent to the second weld overlay surface 42 at the chamfer.

[0024] See Figure 1 , Figure 3 The end face of the second end 22 of the valve disc sleeve 2 is the first weld overlay surface 41. The end of the valve disc core 3 that does not enter the valve disc sleeve 2 receiving space 23 is chamfered, so that the part of the valve disc core 3 that does not enter the valve disc sleeve 2 receiving space 23 forms a second weld overlay surface 42 and a weld overlay slope 43 that are adjacent to each other. During welding, the solder is overlaid on the first weld overlay surface 41, the second weld overlay surface 42 and the weld overlay slope 43, thereby realizing the welding of the valve disc core 3 and the valve disc sleeve 2. By setting the end of the valve disc core 3 with a chamfer to form the second weld overlay surface 42 and the weld overlay slope 43 respectively, this application can effectively increase the weld overlay area and weld overlay strength, and improve the connection strength of the valve disc core 3 and the valve disc sleeve 2.

[0025] In one possible implementation, a first limiting hole is provided on the valve disc core 3 along the radial direction, and a second limiting hole is provided through the valve disc sleeve 2. The first limiting hole and the second limiting hole are coaxial, and a limiting rod is installed in the first limiting hole and the second limiting hole.

[0026] During assembly, the valve stem body 1 is first installed axially on the valve disc sleeve 2. Then, the valve disc core 3 is installed in the second end 22 of the valve disc sleeve 2, and the first limiting hole of the valve disc core 3 is aligned with the second limiting hole of the valve disc sleeve 2. After that, the limiting rod is inserted into the first limiting hole and the second limiting hole. After the valve disc core 3 and the valve disc sleeve 2 are welded together, the limiting rod is welded onto the valve disc sleeve 2 and polished smooth. This setting can avoid the possibility of displacement of the valve disc core 3 and the valve disc sleeve 2 during welding, and improve the welding strength and accuracy of the valve disc core 3 and the valve disc sleeve 2. In addition, with the limiting effect of the limiting rod, the problem of circumferential rotation of the valve disc core 3 relative to the valve disc sleeve 2 and the valve stem body 1 can be effectively avoided, further improving the connection strength of the three and making it practical.

[0027] In one or more embodiments, the second end 22 of the valve sleeve 2 has a recessed stepped layer 25, and the outer periphery of the valve core 3 forms a protrusion 31 that matches the stepped layer 25, so that when the valve core 3 enters the accommodating space 23 of the valve sleeve 2 and is in a stationary position, the protrusion 31 abuts against the stepped layer 25.

[0028] See Figure 1 , Figure 2When installing the valve disc sleeve 2 and valve disc core 3, in order to facilitate the positioning of the welding position of the valve disc core 3, a protrusion 31 can be provided on the valve disc core 3, and a concave stepped layer 25 can be provided on the valve disc core 3. The inner diameter of the stepped layer 25 is larger than the inner diameter of the accommodating space 23. When the valve disc core 3 is fully inserted into the valve disc sleeve 2 at the predetermined position, the protrusion 31 of the valve disc core 3 abuts against the stepped layer 25 of the valve disc sleeve 2, and the valve disc core 3 is in a stationary position at this time. Through this setting, the stability of the valve disc core 3 and the valve disc sleeve 2 during welding can be guaranteed, and the welding quality and welding accuracy of the valve disc core 3 and the valve disc sleeve 2 can be improved.

[0029] In one or more embodiments, the valve disc core 3 has a groove 32 at one end that extends into the valve disc sleeve 2, and a thrust pad 5 for abutting against the valve stem body 1 is installed in the groove 32; the thrust pad 5 is made of stainless steel, copper alloy, or hard plastic (PTEF / PEEK). See also Figure 1 The thrust pad 5 is used to reduce the friction between the valve stem body 1 and the valve disc core 3, reduce the direct contact wear between the valve stem body 1 and the valve disc core 3, and form a protection for the valve stem body 1 and the valve disc core 3.

[0030] In one or more embodiments, the valve disc core 3 has a first slot 33 at one end that extends into the valve disc sleeve 2, and the valve stem body 1 has a second slot 11 at the first end 21 that extends into the valve disc sleeve 2. Limiting pins 6 are installed in the first slot 33 and the second slot 11.

[0031] See Figure 1 , Figure 2 During assembly, firstly, the limiting pin 6 is placed into the second slot 11 at the end of the valve stem body 1, and then the valve disc core 3 is placed into the receiving space 23 of the valve disc sleeve 2. The first slot 33 of the valve disc core 3 is aligned with the limiting pin 6, so that when the valve disc core 3 is fully in place in the valve disc sleeve 2, the other end of the limiting pin 6 can enter the first slot 33 of the valve disc core 3. This setting can prevent the valve stem body 1 from rotating circumferentially relative to the valve disc core 3. After the valve disc core 3 and the valve disc sleeve 2 are welded together, the valve stem body 1, the valve disc core 3 and the valve disc sleeve 2 can be completely fixed as one unit, further improving the connection strength of the valve body assembly.

[0032] In addition, this utility model also provides a ball valve, which has the valve stem and valve disc connection structure in any of the above embodiments.

[0033] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A valve stem and valve disc connection structure, characterized in that, The valve includes a valve stem body, a valve disc sleeve, and a valve disc core. The valve disc sleeve has a first end and a second end, and a receiving space extending through the first end and the second end. The valve stem body extends into the receiving space of the valve disc sleeve through the first end. The valve disc core is installed at the second end of the valve disc sleeve and extends at least partially into the receiving space to press the valve stem body against the valve disc sleeve. The valve disc core and the second end of the valve disc sleeve are fixedly connected by welding.

2. The valve stem and valve disc connection structure according to claim 1, characterized in that: The second end of the valve disc sleeve has a first weld overlay surface, and the circumferential surface of the valve disc core that does not extend into the valve disc sleeve has a second weld overlay surface.

3. The valve stem and valve disc connection structure according to claim 2, characterized in that: The end of the valve disc core that does not extend into the valve disc sleeve is chamfered, so that the valve disc core forms a weld overlay slope adjacent to the second weld overlay surface at the chamfer.

4. The valve stem and valve disc connection structure according to claim 1, characterized in that: The valve sleeve has a concave stepped layer at its second end, and the valve core has a protrusion on its outer periphery that matches the stepped layer. When the valve core enters the accommodating space of the valve sleeve and is in a stationary position, the protrusion abuts against the stepped layer.

5. The valve stem and valve disc connection structure according to claim 1 or 4, characterized in that: The valve disc core has a groove at one end that extends into the valve disc sleeve, and a thrust pad for abutting against the valve stem body is installed in the groove.

6. The valve stem and valve disc connection structure according to claim 1, characterized in that: The valve disc core has a first slot at one end that extends into the valve disc sleeve, and the valve stem body has a second slot at the first end that extends into the valve disc sleeve. Limit pins are installed in the first slot and the second slot.

7. The valve stem and valve disc connection structure according to claim 5, characterized in that: The thrust pad is made of stainless steel, copper alloy, or hard plastic.

8. A ball valve, characterized in that: The valve stem and valve disc connection structure includes any one of claims 1 to 7.

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