Adjustable valve group

Abstract

The utility model relates to an adjustable valve group, which is characterized in that a pipeline valve body is coaxially provided with an adjusting valve channel communicated with a middle flow channel and a first mounting cavity channel communicated with the adjusting valve channel along the radial direction of the pipeline valve body, and one end of a needle valve cover is mounted in the first mounting cavity channel; the needle valve rod is axially arranged in the needle valve cover in a penetrating mode, the upper end, penetrating out of the needle valve cover, of the needle valve rod is provided with a rack portion of a rack, a protective cover arranged outside the needle valve assembly in a covering mode is fixed to the pipeline valve body, a rotating shaft is installed on the protective cover in a penetrating mode, and one end of the rotating shaft is fixedly connected with a gear meshed with the rack. And the other end is fixedly connected with a rotating operation piece positioned outside the protective cover. The movement amount of the needle valve element is more stable and adjustable through the gear-rack driving mode, meanwhile, the gear and the rack have the self-locking function, and the regulation and control stability of the device is guaranteed; spiral lifting of the valve rod is replaced by vertical movement, the non-rotating valve rod and the non-rotating valve element prevent the conical part and the valve seat from being scratched due to extrusion and rotation in the tight closing process, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to an adjustable valve group. Background Art

[0002] Pipeline devices with functions such as shut-off, regulation, drainage, sampling, etc. generally include valves with different functions such as a ball valve with a closing function and a needle valve (instrument regulating valve) with functions of regulation, sampling, and pressure measurement. The needle valve plug is generally a long steel needle that has been quenched, and the valve seat is made of soft materials such as tin and copper.

[0003] In the existing pipeline, the top of the needle valve stem is directly connected with a rotating operating member. The needle valve stem and the valve cover are mostly in a threaded fit form. By rotating the rotating operating member, the spiral lifting of the valve stem is realized, thereby driving the valve core to move to realize the opening and closing of the needle valve. The friction area of each stroke of the valve stem is large, and the regulation accuracy is low. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the defects and deficiencies existing in the prior art, and to provide an adjustable valve group.

[0005] The technical solution adopted by the utility model is as follows: An adjustable valve group includes a pipeline valve body, a needle valve assembly and a ball valve assembly connected to the pipeline valve body. An intermediate flow channel for the medium to flow through is provided in the pipeline valve body. The needle valve assembly includes a needle valve stem, a needle valve core, a needle valve seat and a needle valve cover.

[0006] The pipeline valve body is coaxially provided with a regulating channel communicating with the intermediate flow channel and a first installation channel communicating with the regulating channel along its radial direction. One end of the needle valve cover is installed in the first installation channel. The needle valve stem axially penetrates through the needle valve cover, and the upper end of the needle valve stem protruding from the needle valve cover has a rack portion. A protective cover covering the needle valve assembly is fixed on the pipeline valve body. A rotating shaft is installed through the protective cover. One end of the rotating shaft is fixedly connected with a gear meshing with the rack, and the other end is fixedly connected with a rotating operating member located outside the protective cover.

[0007] Under the rotation action of the rotation driving member, the needle valve stem moves axially through the meshing of the gear and the rack, and drives the needle valve core to move axially, so that the needle valve core has a first sealing position in sealing cooperation with the needle valve seat to close the regulating channel and a first open position away from the needle valve seat.

[0008] Preferably, the needle valve seat has a sealing conical surface, and the needle valve core includes a conical portion at its lower end that cooperates with the sealing conical surface.

[0009] Preferably, the needle valve stem includes a rack portion and a main body rod portion from top to bottom. The main body rod portion and the rack portion form a linkage cooperation in the axial direction.

[0010] The rack part is circumferentially connected with a limiting disc, and a through hole is axially penetrated through the limiting disc. The upper end of the needle valve cover is fixedly connected with a locking screw. The upper end of the locking screw passes through the through hole, and upper and lower locking nuts for axially positioning the limiting disc are respectively connected to the upper and lower ends of the locking screw on the limiting disc.

[0011] Preferably, the needle valve spool includes a linkage part limited inside the bottom of the main body rod part and axially linked and matched with it, and a radial adjustment gap is provided between the linkage part and the bottom of the main body rod part.

[0012] Preferably, a limiting sleeve is sleeved below the linkage part of the needle valve stem. The needle valve spool further includes a main body part connected between the conical part and the linkage part and passing through the limiting sleeve to form a fit with it.

[0013] An installation groove is arranged at the bottom of the needle valve stem. The installation groove includes a first connection groove adapted to the shape of the linkage part and a second threaded hole groove in threaded fixed cooperation with the outer circumference of the limiting sleeve from top to bottom. The lower end of the linkage part abuts against the upper end of the limiting sleeve and is limited in the first connection groove.

[0014] The inner hole diameter of the limiting sleeve is larger than the outer diameter of the main body part, and the radial dimension of the first connection groove is larger than that of the linkage part, so that a radial adjustment gap exists between the inner circumference of the first connection groove and the outer circumference of the linkage part and between the inner circumference of the limiting sleeve and the outer circumference of the main body part.

[0015] Preferably, the top of the linkage part has a centrally symmetric guiding arc surface.

[0016] Preferably, the linkage part includes a limiting block and a guiding hemisphere connected to the center of the top of the limiting block. The guiding arc surface is formed on the surface of the guiding hemisphere, and the plane at the top of the limiting block and the guiding arc surface form the upper end surface of the linkage part.

[0017] Preferably, the limiting sleeve includes a threaded connection part in threaded cooperation with the second threaded hole groove from top to bottom and an abutting part with an outer diameter larger than that of the threaded connection part and an upper end surface abutting against the bottom end of the needle valve stem.

[0018] Preferably, the intermediate flow channel includes two valve cavities located in the pipeline valve body and a connecting flow channel connecting the two valve cavities. The spherical valve assembly includes spheres located in each valve cavity. Each sphere is matched with a ball valve stem penetrating into the valve cavity and a sphere valve seat for sealing in cooperation with the sphere. The sphere rotates synchronously with the ball valve stem to control the flow through and closure of the flow channel, and the regulating flow channel is communicated with the connecting flow channel.

[0019] The beneficial effects of the present utility model are as follows: The needle valve assembly regulates the flow passage of the regulating valve. When sampling, there is no need to close the spherical valve assembly. By opening the needle valve, the first installation cavity is communicated with the regulating valve passage, and part of the medium can flow from the regulating valve passage into the first installation cavity, realizing on-line sampling without affecting the normal flow of the flowing medium.

[0020] The driving form of the gear and rack makes the movement amount of the needle valve spool more stable and adjustable. At the same time, the gear and rack have a self-locking function, ensuring the stability of the regulation of the device. At the same time, the spiral lifting of the valve stem is replaced by up and down movement, greatly reducing the total friction area of each stroke of the valve stem. The non-rotating valve stem and spool avoid scratching due to extrusion and rotation during the closing process between the cone part and the valve seat, extending the service life. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present utility model.

[0022] Figure 1 It is a top view structural diagram of an embodiment of the present utility model;

[0023] Figure 2 It is a front view sectional view of an embodiment of the present utility model;

[0024] Figure 3 It is a partial sectional view of the needle valve assembly in an embodiment of the present utility model;

[0025] Figure 4 It is Figure 3 The enlarged structural view of part A in;

[0026] Figure 5 It is Figure 3 The enlarged structural view of part B in;

[0027] In the figure, 1 is the pipeline valve body; 3 is the limit sleeve; 4 is the needle valve cover; 7 is the protective cover; 11 is the regulating channel; 12 is the first installation channel; 13 is the sphere; 14 is the intermediate channel; 21 is the needle valve stem; 22 is the needle valve core; 23 is the needle valve seat; 31 is the threaded connection part; 32 is the abutting part; 41 is the locking screw; 42 is the upper locking nut; 43 is the lower locking nut; 61 is the ball valve stem; 62 is the sphere seat; 101 is the intermediate channel; 211 is the rack part; 212 is the main body rod part; 221 is the cone part; 222 is the linkage part; 223 is the main body part; 231 is the sealing cone surface; 411 is the upper threaded part; 412 is the lower connecting part; 701 is the rotating shaft; 702 is the gear; 703 is the rotating operating part; 2111 is the rack; 2112 is the limit disk; 2113 is the through hole; 2131 is the first connecting groove; 2132 is the second threaded hole groove; 2221 is the limit block; 2222 is the guiding hemisphere; 2223 is the guiding arc surface. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0029] It should be noted that all the expressions using "first" and "second" in the embodiments of the present utility model are used to distinguish two entities or parameters with the same name but different, so it can be seen that "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present utility model. This will not be elaborated one by one in the subsequent embodiments.

[0030] The terms of direction and position mentioned in the present utility model, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "top", "bottom", "side", etc., are only the directions or positions with reference to the accompanying drawings. Therefore, the terms of direction and position used are for explaining and understanding the present utility model, rather than a limitation on the protection scope of the present utility model.

[0031] As Figures 1 to 5 shown, in the embodiment of the present utility model, a regulable valve group includes a pipeline valve body 1 and a needle valve assembly and a ball valve assembly connected to the pipeline valve body 1. An intermediate channel 101 for the medium to flow through is provided in the pipeline valve body 1. The needle valve assembly includes a needle valve stem 21, a needle valve core 22, a needle valve seat 23, and a needle valve cover 4.

[0032] The pipeline valve body 1 is coaxially provided with a regulating valve passage 11 communicating with the intermediate flow passage 101 and a first installation cavity passage 12 communicating with the regulating valve passage 11 along its radial direction. One end of the needle valve cover 4 is installed in the first installation cavity passage 12. The needle valve stem 21 axially penetrates through the needle valve cover 4, and the upper end thereof protruding from the needle valve cover 4 has a rack portion 211 with a rack 2111. A protective cover 7 covering the needle valve assembly is fixed on the pipeline valve body 1. The protective cover 7 is provided with a rotating shaft 701. One end of the rotating shaft is fixedly connected with a gear 702 meshing with the rack, and the other end is fixedly connected with a rotating operating member 703 located outside the protective cover 7.

[0033] Under the rotational action of the rotational driving member 72, the needle valve stem 21 moves axially along its axis through the meshing of the gear 702 and the rack 2111, and drives the needle valve core 22 to move axially, so that the needle valve core 22 has a first sealing position in sealing cooperation with the needle valve seat 23 to close the regulating valve passage 11 and a first open position away from the needle valve seat 23.

[0034] Through this setting, the driving form of the gear and rack makes the movement amount of the needle valve core more stable and adjustable. At the same time, the gear and rack have a self-locking function, ensuring the stability of the regulation of this device. At the same time, the spiral lifting of the valve stem is replaced by the up and down movement, greatly reducing the total friction area of each stroke of the valve stem. The non-rotating valve stem and valve core avoid scratching due to extrusion and rotation during the closing process between the conical part and the valve seat, extending the service life.

[0035] The needle valve assembly regulates the regulating valve passage. When sampling, it is not necessary to close the ball valve assembly. By opening the needle valve, the first installation cavity passage is communicated with the regulating valve passage, and part of the medium can flow from the regulating valve passage to the first installation cavity passage to realize online sampling, without affecting the normal flow of the flowing medium.

[0036] The needle valve seat 23 has a sealing conical surface 231, and the needle valve core 22 includes a conical part 221 located at its lower end and cooperating with the sealing conical surface 231.

[0037] Through this setting, a seal is formed between the needle valve seat and the needle valve core through conical surfaces with shape adaptation. Under the driving cooperation of the gear and rack, while realizing the opening and closing cooperation between the two, the sampling flow rate can be accurately regulated.

[0038] The needle valve stem 21 includes a rack portion 211 and a main body rod portion 212 from top to bottom, and the main body rod portion 212 forms an axial linkage cooperation with the rack portion 211.

[0039] The rack part 211 is circumferentially connected with a limit disk 2112. A through hole 2113 axially penetrates through the limit disk 2112. The upper end of the needle valve cover 4 is fixedly connected with a locking screw 41. The upper end of the locking screw 41 passes through the through hole 2113. Upper and lower locking nuts 42 and 43 for axially positioning the limit disk 2112 are respectively connected to the upper and lower ends of the locking screw 41 on the limit disk 2112.

[0040] Through this setting, in the non-lifting adjustment state, the upper and lower locking nuts lock the limit disk. When it is necessary to open and close the needle valve, the upper and lower locking nuts are rotated to positions away from the limit disk, thereby further improving the adjustment stability of the device.

[0041] The needle valve spool 22 includes a linkage part 222 limited inside the bottom of the main body rod part 212 and axially linked and matched with it. A radial adjustment gap exists between the linkage part 222 and the bottom of the main body rod part 212.

[0042] Through this setting, the needle valve rod and the needle valve spool maintain the linkage and cooperation during lifting. At the same time, due to the existence of the radial adjustment gap, during the closing process of the needle valve spool, the conical part will perform adaptive compensation sealing according to the position of the needle valve seat to correct the errors brought during the assembly or processing process, reducing the processing precision requirements for the spool and valve seat.

[0043] A limit screw sleeve 3 is sleeved below the linkage part 222 of the needle valve rod 21. The needle valve spool 22 further includes a main body part 223 connected between the conical part 221 and the linkage part 222 and passing through the limit screw sleeve 3 to form a fit with it.

[0044] An installation groove 213 is arranged at the bottom of the needle valve rod 21. The installation groove 213 includes a first connection groove 2131 adapted to the shape of the linkage part 222 and a second threaded hole groove 2132 threadedly fixed and matched with the outer circumference of the limit screw sleeve 3 from top to bottom. The lower end of the linkage part 222 abuts against the upper end of the limit screw sleeve 3 and is limited inside the first connection groove 2131.

[0045] The inner hole diameter of the limit screw sleeve 3 is larger than the outer diameter of the main body part 223, and the radial dimension of the first connection groove 2131 is larger than that of the linkage part 222, so that a radial adjustment gap exists between the inner circumference of the first connection groove 2131 and the outer circumference of the linkage part 222 and between the inner circumference of the limit screw sleeve 3 and the outer circumference of the main body part 223.

[0046] With this setting, the limit sleeve limits the linkage part in 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 spool during lifting and lowering. And due to the existence of the radial adjustment gaps between the first connection groove and the linkage part, and between the limit sleeve and the main body part, during the closing process of the needle valve spool, the conical part will perform self-centering sealing according to the position of the needle valve seat, ensuring the sealing effect through adaptive compensation.

[0047] The top of the linkage part 222 has a centrally symmetric guiding arc surface 2223.

[0048] With this setting, compared with a flat surface, the guiding arc surface reduces the wear during the process of the linkage part touching the valve stem.

[0049] The linkage part 222 includes a limit block 2221 and a guiding hemisphere 2222 connected to the center of the top of the limit block 2221. The guiding arc surface 2223 is formed on the surface of the guiding hemisphere 2222. The flat surface at the top of the limit block 2221 and the guiding arc surface 2223 form the upper end surface of the linkage part 222.

[0050] With this setting, the upper end surface of the linkage part is composed of the top flat surface of the limit block and the hemispherical surface of the guiding hemisphere. Compared with the matching forms of a single flat surface or an arc surface, the guiding hemisphere has a certain guiding effect during the self-centering process of the spool, further improving the self-centering effect of the spool. At the same time, the smooth surface of the hemisphere reduces the wear during its contact with the valve stem; the flat surface at the top of the limit block ensures the stability of the cooperation between the spool and the valve stem during the opening and closing of the valve.

[0051] The limit sleeve 3 includes, from top to bottom, a threaded connection part 31 that forms a threaded fit with the second threaded hole groove 2132 and a contact part 32 whose outer diameter is larger than that of the threaded connection part 31 and whose upper end surface abuts against the bottom end of the needle valve stem 21.

[0052] With this setting, the contact part is beneficial for the limit sleeve to be installed in place. At the same time, when installed in place, it forms a surface-to-surface contact with the bottom of the valve stem, improving the connection stability between the two during the opening process of the valve.

[0053] The intermediate flow channel 101 includes two valve cavities located in the pipeline valve body 1 and a connecting flow channel 14 that connects the two valve cavities. The ball valve assembly includes a sphere 13 located in each valve cavity. Each sphere 13 is matched with a ball valve stem 61 that penetrates into the valve cavity and a sphere valve seat 62 that cooperates with the sphere 13 to achieve sealing. The sphere 13 rotates synchronously with the ball valve stem 61 to control the flow-through and closing of the flow channel. The regulating channel 11 is connected to the connecting flow channel 14.

[0054] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A controllable valve assembly, comprising a pipeline valve body (1), and a needle valve assembly and a ball valve assembly connected to the pipeline valve body (1), wherein an intermediate flow channel (101) for medium circulation is provided in the pipeline valve body (1), and the needle valve assembly comprises a needle valve stem (21), a needle valve core (22), a needle valve seat (23), and a needle valve cover (4), characterized in that: The pipeline valve body (1) is coaxially provided with a regulating valve channel (11) communicating with the intermediate flow channel (101) and a first installation cavity (12) communicating with the regulating valve channel (11) along its radial direction; one end of the needle valve cover (4) is installed in the first installation cavity (12); the needle valve stem (21) is axially inserted into the needle valve cover (4) and has a rack portion (211) with a rack (2111) at its upper end passing through the needle valve cover (4); a protective cover (7) is fixed to the pipeline valve body (1) and is arranged outside the needle valve assembly; a rotating shaft (701) is installed through the protective cover (7); one end of the rotating shaft is fixedly connected to a gear (702) meshing with the rack; the other end of the rotating shaft is fixedly connected to a rotating operating member (703) located outside the protective cover (7); Under the rotation action of the rotating driving member (72), the needle valve stem (21) moves axially through the meshing of the gear (702) and the rack (2111) and drives the needle valve core (22) to move axially so that the needle valve core (22) has a first sealing position that seals with the needle valve seat (23) to close the regulating valve channel (11) and a first open position away from the needle valve seat (23).

2. The adjustable valve assembly according to claim 1, characterized in that: The needle valve seat (23) has a sealing conical surface (231), and the needle valve core (22) includes a conical portion (221) at its lower end that matches the sealing conical surface (231).

3. The adjustable valve assembly according to claim 1, characterized in that: The needle valve stem (21) comprises a rack portion (211) and a main stem portion (212) from top to bottom, wherein the main stem portion (212) and the rack portion (211) form a linkage fit in the axial direction. The rack portion (211) is circumferentially connected to a limit plate (2112), a through hole (2113) axially extending through the limit plate (2112), a locking screw (41) being fixedly connected to the upper end of the needle valve cover (4), the upper end of the locking screw (41) passing through the through hole (2113), and an upper locking nut (42) and a lower locking nut (43) for axially positioning the limit plate (2112) are respectively connected to the upper and lower ends of the locking screw (41).

4. The adjustable valve assembly according to claim 3, characterized in that: The needle valve core (22) comprises a linkage portion (222) which is limited within the bottom of the main body rod portion (212) and forms an axial linkage match therewith, and a radial adjustment gap is provided between the linkage portion (222) and the bottom of the main body rod portion (212).

5. The adjustable valve assembly according to claim 4, characterized in that: The needle valve stem (21) is sleeved with a limiting screw sleeve (3) below its linkage portion (222), and 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 (213), and the mounting groove (213) comprises, from top to bottom, a first connecting groove (2131) adapted to the shape of the linkage portion (222) and a second threaded hole groove (2132) 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 (2131), 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 (2131) is larger than the linkage part (222), so that the radial adjustment gap exists between the inner circumference of the first connecting groove (2131) and the outer circumference of the linkage part (222), and between the inner circumference of the limiting screw sleeve (3) and the outer circumference of the main body (223).

6. The adjustable valve assembly according to claim 5, characterized in that: The top of the linkage portion (222) is provided with a centrally symmetrical guiding cambered surface (2223).

7. The adjustable valve assembly according to claim 6, 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 a plane at the top of the limit block (2221) and the guide arc surface (2223) form an upper end surface of the linkage part (222).

8. The adjustable valve assembly according to claim 5, characterized in that: The limiting screw sleeve (3) comprises, from top to bottom, a threaded connection portion (31) threadably matched with the second threaded hole groove (2132) and an abutment 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).

9. The adjustable valve assembly according to any one of claims 1 to 8, characterized in that: The intermediate flow channel (101) includes two valve chambers located in the pipeline valve body (1) and a connecting 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) cooperating with the ball (13) to achieve sealing. The ball (13) rotates synchronously with the ball valve stem (61) to control the flow and closing of the flow channel. The regulating valve channel (11) is connected to the connecting flow channel (14).

Images