Self-adaptive compensation sealing ball needle valve

Abstract

The utility model relates to a self-adaptive compensation sealing ball needle valve which comprises a valve body pipeline, a needle valve assembly connected to the valve body pipeline and a ball valve assembly. A needle valve element comprises a conical part matched with a needle valve seat and a linkage part limited in the bottom of a needle valve rod and in axial linkage fit with the needle valve rod. And a radial adjusting gap is formed between the linkage part and the bottom of the needle valve rod. The needle valve rod and the needle valve element are in linkage fit in the lifting process, meanwhile, due to the existence of the radial adjusting gap, the conical part can conduct self-adaptive compensation sealing according to the position of the needle valve seat in the needle valve element closing process so as to correct errors caused in the assembling or machining process, and the requirement for the machining precision of the valve element and the valve seat is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a ball needle valve with adaptive compensation sealing. Background Art

[0002] Pipeline devices with functions such as shutoff, regulation, relief, and sampling generally include valves with different functions, such as ball valves for shutoff and needle valves (instrument control valves) for regulation, sampling, and pressure measurement. Needle valve plugs are generally made of a long, hardened steel needle, while the valve seat is made of a soft material such as tin or copper. The seal between the valve needle and valve seat is achieved by the tight fit of their conical surfaces.

[0003] In existing pipeline devices, the needle valve tip and the valve stem are mostly an integrated structure with fixed fit in both axial and radial directions, which makes it impossible for the valve needle cone surface to adaptively adjust its sealing fit position with the valve seat. The processing accuracy of the valve needle cone surface and the valve seat is very high, and the cone surface must be finely ground to achieve a high degree of sealing effect. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a ball needle valve with adaptive compensating seal.

[0005] The technical solution adopted by the utility model is as follows: a ball needle valve with adaptive compensation seal, including a valve body pipeline, a needle valve assembly connected to the valve body pipeline, and a ball valve assembly. A flow channel for medium circulation is opened in the valve body pipeline. The needle valve assembly includes a needle valve stem, a needle valve core, and a needle valve seat.

[0006] The valve body pipeline is coaxially provided with a regulating valve channel connected to the flow channel and a first moving channel for the needle valve core to move along its radial direction. The needle valve stem moves along its axial direction and drives the needle valve core to move axially along the first moving channel so that it has a first sealing position that cooperates with the needle valve seat to seal and close the regulating valve channel.

[0007] The needle valve core includes a cone portion matched with the needle valve seat and a linkage portion limited in the bottom of the needle valve stem and forming an axial linkage match therewith, and a radial adjustment gap is provided between the linkage portion and the bottom of the needle valve stem.

[0008] Preferably, the needle valve stem is provided with a limiting screw sleeve below its linkage portion, and the needle valve core further comprises a main body portion connecting the cone portion and the linkage portion and passing through the limiting screw sleeve to form a match therewith.

[0009] The bottom of the needle valve stem is provided with a mounting groove, and the mounting groove includes, from top to bottom, a first connecting groove adapted to the shape of the linkage portion and a second threaded hole groove that forms a threaded fixed fit with the outer circumference of the limiting screw sleeve. The lower end of the linkage portion abuts against the upper end of the limiting screw sleeve and is limited in the first connecting groove.

[0010] The inner hole diameter of the limiting screw sleeve is larger than the outer circumference diameter of the main body, and the radial dimension of the first connecting groove is larger than the linkage part, so that the radial adjustment gap exists between the inner circumference of the first connecting groove and the outer circumference of the linkage part, and between the inner circumference of the limiting screw sleeve and the outer circumference of the main body.

[0011] Preferably, the top of the linkage portion has a centrally symmetrical guiding arc surface.

[0012] Preferably, the linkage part includes a limit block and a guide hemisphere connected to the top center of the limit block, the surface of the guide hemisphere forms a guide arc surface, and the plane at the top of the limit block and the guide arc surface constitute the upper end surface of the linkage part.

[0013] Preferably, the limiting screw sleeve includes, from top to bottom, a threaded connection portion threadedly matched with the second threaded hole groove and an abutment portion with an outer diameter larger than the threaded connection portion and an upper end surface abutting against the bottom end of the needle valve stem.

[0014] Preferably, the valve body pipeline is connected to a needle valve cover, and a second moving channel for the needle valve stem to move and connected to the first moving channel is axially arranged in the needle valve cover.

[0015] The needle valve stem includes an upper valve stem assembly and a lower valve stem portion from top to bottom, wherein the upper end of the lower valve stem portion is limitedly located within the lower end of the upper valve stem assembly so that the lower valve stem portion and the upper valve stem assembly form a linkage fit in the axial direction.

[0016] The second movable channel includes, from top to bottom, an upper threaded portion that is threadedly engaged with the upper valve stem assembly and a lower connecting portion that is sized to and slides with the lower valve stem. The upper valve stem assembly rotates and rises and falls in the second movable channel and drives the lower valve stem to rise and fall accordingly.

[0017] Preferably, the lower end of the needle valve cover is threadedly connected to the valve body pipeline.

[0018] Preferably, the upper valve stem assembly includes an upper valve stem portion whose lower end forms a linkage fit with the lower valve stem portion, and a reinforcement sleeve fixedly sleeved on the outer periphery of the upper valve stem portion and threadedly fitted with the upper threaded portion. The upper end of the upper valve stem portion passes through the second movable channel and is connected to a turning handle.

[0019] Preferably, the flow channel includes two valve chambers located in the valve body pipeline and an intermediate flow channel connecting the two valve chambers. The ball valve assembly includes a ball located in each valve chamber. Each ball is matched with a ball valve stem that penetrates into the valve chamber and a ball valve seat that cooperates with the ball to achieve sealing. The ball rotates synchronously with the ball valve stem to control the flow and closing of the flow channel. The regulating valve channel is connected to the intermediate flow channel.

[0020] Preferably, both ball valve stems pass through the valve body pipeline in the radial direction of the valve body pipeline and are connected to an operating member, and the two ball valve stems are located at different radial positions of the valve body pipeline.

[0021] The beneficial effects of the present invention are as follows: the needle valve stem and the needle valve core maintain linkage cooperation during lifting and lowering. At the same time, due to the existence of the radial adjustment gap, during the closing process of the needle valve core, the cone will adaptively compensate and seal according to the position of the needle valve seat to correct errors caused by the assembly or processing process, thereby reducing the processing accuracy requirements for the valve core and valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0023] Figure 1 This is a top view of the structure of an embodiment of the utility model;

[0024] Figure 2 This is a front cross-sectional view of an embodiment of the utility model;

[0025] Figure 3 This is a partial cross-sectional view of a needle valve assembly in an embodiment of the present utility model;

[0026] Figure 4 for Figure 3 A magnified view of the structure at point A;

[0027] In the figure, 1. valve body pipeline; 2. needle valve assembly; 3. limiting screw sleeve; 4. needle valve cover; 5. turning handle; 11. regulating valve channel; 12. first moving channel; 13. sphere; 14. intermediate flow channel; 21. needle valve stem; 22. needle valve core; 23. needle valve seat; 31. threaded connection part; 32. abutment part; 61. ball valve stem; 62. ball valve seat; 63. operating part; 211. mounting groove; 212. upper valve stem; 213. lower valve stem; 214. reinforcement sleeve; 221. cone; 222. linkage part; 223. main body; 411. upper threaded part; 412. lower connecting part; 2111. first connecting groove; 2112. second threaded hole groove; 2221. limiting block; 2222. guide hemisphere; 2223. guide arc surface. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0030] The directional and positional terms used in this invention, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are used solely to refer to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are intended to illustrate and facilitate understanding of this invention and are not intended to limit the scope of protection of this invention.

[0031] like Figures 1 to 4 As shown in the figure, an adaptive compensating sealed ball needle valve in the embodiment of the present invention comprises a valve body pipeline 1, a needle valve assembly 2 connected to the valve body pipeline 1, and a ball valve assembly. A flow channel for medium circulation is opened in the valve body pipeline 1. The needle valve assembly 2 comprises a needle valve stem 21, a needle valve core 22, and a needle valve seat 23.

[0032] The valve body pipeline 1 is coaxially provided with a regulating valve path 11 connected to the flow path and a first moving channel 12 for the needle valve core 22 to move along its radial direction. The needle valve stem 21 moves along its axial direction and drives the needle valve core 22 to move axially along the first moving channel 12 so that it has a first sealing position that seals the regulating valve path 11 with the needle valve seat 23.

[0033] The needle valve core 22 includes a cone portion 221 that cooperates with the needle valve seat 23 and a linkage portion 222 that is limited in the bottom of the needle valve stem 21 and forms an axial linkage with it. There is a radial adjustment gap between the linkage portion 222 and the bottom of the needle valve stem 21.

[0034] Through this setting, the needle valve stem and the needle valve core maintain linkage cooperation during lifting and lowering. At the same time, due to the existence of the radial adjustment gap, the cone will adaptively compensate and seal according to the position of the needle valve seat during the closing process of the needle valve core to correct errors caused by the assembly or processing process, thereby reducing the processing accuracy requirements for the valve core and valve seat.

[0035] The needle valve stem 21 is provided with a limiting screw sleeve 3 below its linkage portion 222. The needle valve core 22 further includes a main body portion 223 connecting the cone portion 221 and the linkage portion 222 and passing through the limiting screw sleeve 3 to form a match therewith.

[0036] The bottom of the needle valve stem 21 is provided with a mounting groove 211, which includes, from top to bottom, a first connecting groove 2111 that matches the shape of the linkage portion 222 and a second threaded hole groove 2112 that forms a threaded fixed fit with the outer periphery of the limiting screw sleeve 3. The lower end of the linkage portion 222 abuts against the upper end of the limiting screw sleeve 3 and is limited in the first connecting groove 2111.

[0037] The inner hole diameter of the limiting screw sleeve 3 is larger than the outer circumference diameter of the main body 223, and the radial dimension of the first connecting groove 2111 is larger than the linkage part 222, so that the radial adjustment gap exists between the inner periphery of the first connecting groove 2111 and the outer periphery of the linkage part 222, and between the inner periphery of the limiting screw sleeve 3 and the outer periphery of the main body 223.

[0038] Through this arrangement, the limiting screw sleeve limits the linkage part to the installation groove at the bottom of the needle valve stem, thereby realizing the linkage cooperation between the needle valve stem and the needle valve core during the lifting and lowering, and through the existence of the radial adjustment gap between the first connecting groove and the linkage part, and the limiting screw sleeve and the main body, during the closing process of the needle valve core, the cone will perform self-centering sealing according to the position of the needle valve seat, and the sealing effect is ensured through adaptive compensation.

[0039] The top of the linkage portion 222 has a centrally symmetrical guiding arc surface 2223 .

[0040] With this arrangement, the guide arc surface reduces the wear during the contact between the linkage portion and the valve stem compared to the flat surface.

[0041] The linkage part 222 includes a limit block 2221 and a guide hemisphere 2222 connected to the top center of the limit block 2221. The surface of the guide hemisphere 2222 forms a guide arc surface 2223. The plane at the top of the limit block 2221 and the guide arc surface 2223 constitute the upper end surface of the linkage part 222.

[0042] Through this setting, the upper end surface of the linkage part is composed of the top plane of the limit block and the hemispherical surface of the guide hemisphere. Compared with the matching form of a single plane or arc surface, the guide hemisphere has a certain guiding effect during the self-centering process of the valve core, further improving the self-centering effect of the valve core. At the same time, the smooth surface of the hemisphere reduces the wear during the contact between it and the valve stem; the plane on the top of the limit block ensures the stability of the matching between the valve core and the valve stem during the opening and closing of the valve.

[0043] The limiting screw sleeve 3 includes, from top to bottom, a threaded connection portion 31 threadedly matched with the second threaded hole 2112 and an abutting portion 32 with an outer diameter larger than the threaded connection portion 31 and an upper end surface abutting against the bottom end of the needle valve stem 21 .

[0044] With this arrangement, the abutment portion facilitates the installation of the limiting screw sleeve. At the same time, when installed in place, it forms a surface-to-surface abutment with the bottom of the valve stem, thereby improving the stability of the connection between the two during the valve opening process.

[0045] The valve body pipeline 1 is connected to the needle valve cover 4, and a second moving channel for the needle valve stem 21 to move and connected to the first moving channel 12 is axially arranged in the needle valve cover 4.

[0046] The needle valve stem 21 includes an upper valve stem assembly and a lower valve stem portion 213 from top to bottom. The upper end of the lower valve stem portion 213 is limited to the lower end of the upper valve stem assembly so that the lower valve stem portion 213 forms a linkage fit with the upper valve stem assembly in the axial direction.

[0047] The second movable channel includes, from top to bottom, an upper threaded portion 411 threadedly engaged with the upper valve stem assembly and a lower connecting portion 412 that is sized to and slides with the lower valve stem portion 213. The upper valve stem assembly rotates and rises and falls in the second movable channel and drives the lower valve stem portion 213 to rise and fall accordingly.

[0048] Through this arrangement, the spiral lifting of the lower valve stem is replaced by up and down motion, which greatly reduces the total friction area of each valve stem stroke. The non-rotating lower valve stem and valve core avoid scratches on the cone and valve seat due to extrusion and rotation during the closing process, thereby extending the service life.

[0049] The lower end of the needle valve cover 4 is threadedly connected to the valve body pipeline 1.

[0050] This arrangement improves the convenience of disassembling and assembling the valve cover and the valve body pipeline.

[0051] The upper valve stem assembly includes an upper valve stem portion 212 whose lower end forms a linkage fit with the lower valve stem portion 213, and a reinforcement sleeve 214 fixedly sleeved on the outer periphery of the upper valve stem portion 212 and threadedly fitted with the upper threaded portion 411. The upper end of the upper valve stem portion 212 passes through the second movable channel and is connected to the turning handle 5.

[0052] The flow channel includes two valve chambers located in the valve body pipeline 1 and an intermediate flow channel 14 connecting the two valve chambers. The ball valve assembly includes a ball 13 located in each valve chamber. Each ball 13 is matched with a ball valve stem 61 that penetrates into the valve chamber and a ball valve seat 62 that cooperates with the ball 13 to achieve sealing. The ball 13 rotates synchronously with the ball valve stem 61 to control the circulation and closing of the flow channel. The regulating valve channel 11 is connected to the intermediate flow channel 14.

[0053] Through this arrangement, the rationality of the overall structural layout of the device is improved.

[0054] The two ball valve stems 61 both pass through the valve body pipeline 1 in the radial direction of the valve body pipeline 1 and are connected to the operating member 63 , and the two ball valve stems 61 are located at different radial positions of the valve body pipeline 1 .

[0055] This arrangement prevents interference between the operating elements of the two ball valves. The needle valve assembly regulates the regulating valve path, and sampling can be performed online by opening the needle valve without closing the ball valve assembly, without affecting the normal flow of the flowing medium.

[0056] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A ball needle valve with adaptive compensating seal, comprising a valve body pipeline (1), a needle valve assembly (2) connected to the valve body pipeline (1), and a ball valve assembly, wherein a flow channel for medium circulation is provided in the valve body pipeline (1), the needle valve assembly (2) comprises a needle valve stem (21), a needle valve core (22), and a needle valve seat (23). The valve body pipe (1) is coaxially provided with a regulating valve path (11) communicating with the flow path and a first moving channel (12) for the needle valve core (22) to move along its radial direction. The needle valve stem (21) moves along its axial direction and drives the needle valve core (22) to move axially along the first moving channel (12) so that it has a first sealing position that seals the regulating valve path (11) in cooperation with the needle valve seat (23). The valve body pipe (1) is characterized in that: The needle valve core (22) comprises a conical portion (221) matched with the needle valve seat (23) and a linkage portion (222) limited within the bottom of the needle valve stem (21) and forming an axial linkage match therewith, and a radial adjustment gap is provided between the linkage portion (222) and the bottom of the needle valve stem (21).

2. The ball needle valve with adaptive compensating seal according to claim 1, characterized in that: The needle valve stem (21) is provided with a limiting screw sleeve (3) below its linkage portion (222). The needle valve core (22) further comprises a main body (223) connected between the cone portion (221) and the linkage portion (222) and passing through the limiting screw sleeve (3) to form a match therewith. The bottom of the needle valve stem (21) is provided with a mounting groove (211), and the mounting groove (211) includes, from top to bottom, a first connecting groove (2111) adapted to the shape of the linkage portion (222) and a second threaded hole groove (2112) threadedly fixedly matched with the outer periphery of the limiting screw sleeve (3), the lower end of the linkage portion (222) abuts against the upper end of the limiting screw sleeve (3) and is limited in the first connecting groove (2111). The inner diameter of the limiting screw sleeve (3) is larger than the outer diameter of the main body (223), and the radial dimension of the first connecting groove (2111) is larger than the linkage portion (222), so that radial adjustment gaps exist between the inner periphery of the first connecting groove (2111) and the outer periphery of the linkage portion (222), and between the inner periphery of the limiting screw sleeve (3) and the outer periphery of the main body (223).

3. The ball needle valve with adaptive compensating seal according to claim 2, characterized in that: The top of the linkage portion (222) has a centrally symmetrical guiding arc surface (2223).

4. The ball needle valve with adaptive compensating seal according to claim 3, characterized in that: The linkage part (222) comprises a limit block (2221) and a guide hemisphere (2222) connected to the top center of the limit block (2221); a guide arc surface (2223) is formed on the surface of the guide hemisphere (2222); and the plane at the top of the limit block (2221) and the guide arc surface (2223) constitute the upper end surface of the linkage part (222).

5. The ball needle valve with adaptive compensating seal according to claim 2, characterized in that: The limiting screw sleeve (3) comprises, from top to bottom, a threaded connection portion (31) threadedly matched with the second threaded hole groove (2112) and an abutting portion (32) having an outer diameter larger than the threaded connection portion (31) and an upper end surface abutting against the bottom end of the needle valve stem (21).

6. The ball needle valve with adaptive compensating seal according to claim 1, characterized in that: The valve body pipe (1) is connected to a needle valve cover (4), and a second moving channel for the needle valve stem (21) to move and connected to the first moving channel (12) is axially provided in the needle valve cover (4). The needle valve stem (21) comprises an upper valve stem assembly and a lower valve stem portion (213) from top to bottom, wherein the upper end of the lower valve stem portion (213) is limitedly located within the lower end of the upper valve stem assembly so that the lower valve stem portion (213) forms a linkage fit with the upper valve stem assembly in the axial direction. The second movable channel includes, from top to bottom, an upper threaded portion (411) threadably engaged with the upper valve stem assembly and a lower connecting portion (412) adapted in size to form a sliding engagement with the lower valve stem portion (213); the upper valve stem assembly rotates and rises and falls in the second movable channel and drives the lower valve stem portion (213) to rise and fall accordingly.

7. The ball needle valve with adaptive compensating seal according to claim 6, characterized in that: The lower end of the needle valve cover (4) is threadedly connected to the valve body pipeline (1).

8. The ball needle valve with adaptive compensating seal according to claim 6, characterized in that: The upper valve stem assembly includes an upper valve stem portion (212) whose lower end forms a linkage fit with the lower valve stem portion (213) and a reinforcing sleeve (214) fixedly sleeved on the outer periphery of the upper valve stem portion (212) and threadedly fitted with the upper threaded portion (411); the upper end of the upper valve stem portion (212) passes through the second movable channel and is connected to the turning handle (5).

9. The ball needle valve with adaptive compensating seal according to any one of claims 1 to 8, characterized in that: The flow channel includes two valve chambers located in the valve body pipeline (1) and an intermediate flow channel (14) connecting the two valve chambers. The ball valve assembly includes a ball (13) located in each valve chamber. Each ball (13) is matched with a ball valve stem (61) penetrating into the valve chamber and a ball valve seat (62) that cooperates with the ball (13) to achieve sealing. The ball (13) rotates synchronously with the ball valve stem (61) to control the flow and closure of the flow channel. The regulating valve channel (11) is connected to the intermediate flow channel (14).

10. The ball needle valve with adaptive compensating seal according to claim 9, characterized in that: The two ball valve stems (61) both pass through the valve body pipeline (1) in the radial direction of the valve body pipeline (1) and are connected to an operating member (63), and the two ball valve stems (61) are located at different radial positions of the valve body pipeline (1).

Images