Rotary valve

Abstract

The utility model discloses a rotary valve which comprises a valve cover, a top cover, a limiting piece and a valve rod assembly. The top cover is fixedly installed on the valve cover and is coaxial with the valve cover, and a sealing cavity is defined between the top cover and the valve cover; the limiting piece is fixedly mounted on the top cover and is partially arranged in the sealing cavity; the valve rod assembly is rotationally installed in the valve deck in the axial direction and partially located in the sealing cavity. In the first state, the valve rod assembly abuts against the limiting piece, and the valve rod assembly is locked in the preset rotating direction. And in the second state, the valve rod assembly is separated from the limiting piece, and the valve rod assembly freely rotates. According to the rotary valve, the limiting piece can be arranged in the sealing cavity, corrosion of the limiting piece is avoided, limiting is accurate, and circulation performance when the rotary valve is opened and sealing performance when the rotary valve is closed are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of underwater valve technology, specifically relating to a rotary valve. Background Technology

[0002] Currently used valves, such as flat gate valves or ball valves, each have their drawbacks in small-size applications, making it difficult to meet the actual requirements of projects. For example, flat gate valves have long strokes and large dimensions, which cannot meet the requirements of compact layout in underwater production systems. Furthermore, the smaller the size, the more difficult it is to manufacture. For ball valves, due to the common use of hard-seal structures underwater, ball valves of certain diameters present challenges in manufacturing and sealing. Therefore, rotary valves were designed to avoid these problems. Rotary valves are mainly used in underwater manifolds, Christmas trees, hydraulic systems, etc., for injecting chemical agents or shutting off hydraulic systems. Existing rotary valves have external limiting structures. Due to corrosion, biofilm, and surface fouling, these existing limiting structures can become inaccurate after long-term use, affecting the flow during opening and the sealing performance during closing.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this utility model is to provide a rotary valve that can place the limiting element in the sealing cavity to avoid corrosion of the limiting element, ensure accurate positioning, and guarantee the flow when the rotary valve is opened and the sealing when it is closed.

[0005] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0006] A rotary valve, the rotary valve comprising:

[0007] Valve cover;

[0008] A top cover is fixedly installed on the valve cover and coaxially arranged with the valve cover, and a sealed cavity is formed between the top cover and the valve cover;

[0009] A limiting component is fixedly installed on the top cover and partially disposed in the sealing cavity;

[0010] A valve stem assembly is rotatably mounted in the valve cover along the axial direction and is partially located in the sealing cavity;

[0011] In the first state, the valve stem assembly abuts against the limiting member, and the valve stem assembly is locked in a predetermined rotation direction;

[0012] In the second state, the valve stem assembly is separated from the limiting member, and the valve stem assembly rotates freely.

[0013] In one or more embodiments of the present invention, the valve stem assembly includes a valve stem rotatably mounted in the valve cover and a control shaft rotatably mounted in the top cover. The valve stem and / or the control shaft are provided with a limiting block that cooperates with the limiting member. In a first state, the limiting block abuts against the limiting member, and in a second state, the limiting block separates from the limiting member.

[0014] In one or more embodiments of the present invention, the super control shaft includes a rod body rotatably mounted to the top cover and a head provided on the end of the rod body facing the valve stem. The head is provided with a plurality of limiting blocks in the circumferential direction, and the limiting members are at least partially located between two adjacent limiting blocks.

[0015] In one or more embodiments of the present invention, the limiting block includes a first limiting block and a second limiting block disposed opposite to each other, and the limiting member includes a first limiting member and a second limiting member disposed opposite to each other.

[0016] In one or more embodiments of this utility model, there is a gap between the limiting member and the head.

[0017] In one or more embodiments of the present invention, the valve stem assembly further includes a gland located in the sealing cavity and sleeved in the valve cover, the valve stem being sleeved in the gland, and a cavity is formed between the gland, the valve cover and the valve stem, the cavity being filled with filler.

[0018] In one or more embodiments of this utility model, a first sealing element is provided between the valve cover and the top cover, a second sealing element is provided between the valve cover and the pressure cover, a third sealing element is provided between the pressure cover and the valve stem, and a fourth sealing element is provided between the control shaft and the top cover.

[0019] In one or more embodiments of this utility model, a first thrust bearing is provided between the valve stem and the valve cover, a second thrust bearing is provided between the upper surface of the control shaft and the top cover, and a third thrust bearing is provided between the lower surface of the control shaft and the pressure cover.

[0020] In one or more embodiments of this utility model, a first guide belt is provided between the valve stem and the valve cover, a second guide belt is provided between the valve stem and the pressure cap, and a third guide belt is provided between the control shaft and the top cover.

[0021] In one or more embodiments of this utility model, the top cover is provided with an oil injection hole communicating with the sealing cavity, and a sealing plug is sealed and installed in the oil injection hole; and / or,

[0022] The top cover is provided with a vent that communicates with the sealing cavity, and the rotary valve also includes a vent valve fixedly installed in the vent.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This utility model provides a rotary valve in which the limiting component is located in the sealing cavity, and is not affected by rust, biological coverage, surface scale, etc. It can always maintain accurate limiting, ensuring the flow when the rotary valve is opened and the sealing performance when closed, thus increasing the service life of the rotary valve. In addition, oil can be injected into the sealing cavity to improve the lubrication of the rotary valve stem assembly and play a role in preventing corrosion of the structure inside the sealing cavity. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of the rotary valve in one embodiment of the present invention;

[0027] Figure 2 for Figure 1 Enlarged view of the local structure at point A;

[0028] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at point BB;

[0029] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure at point CC. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] The technical solution of this utility model will now be described with reference to the accompanying drawings.

[0034] Reference Figures 1-3 As shown, a rotary valve in one embodiment of this utility model includes: a valve cover 1, a top cover 2, a limiting member 3, and a valve stem assembly 4. The top cover 2 is fixedly installed on the valve cover 1 and is coaxially arranged with the valve cover 1, forming a sealing cavity 20 between the top cover 2 and the valve cover 1; the limiting member 3 is fixedly installed on the top cover 2 and is partially disposed in the sealing cavity 20; the valve stem assembly 4 is rotatably installed in the valve cover 1 along the axial direction and is partially located in the sealing cavity 20; in a first state, the valve stem assembly 4 abuts against the limiting member 3, and the valve stem assembly 4 is locked in a predetermined rotation direction; in a second state, the valve stem assembly 4 is separated from the limiting member 3, and the valve stem assembly 4 rotates freely. The valve cover 1 and the top cover 2 are fastened together by a first fastener 21. The predetermined rotation direction can be clockwise or counterclockwise along the axial direction. When the valve stem assembly 4 rotates clockwise along the axial direction until it abuts against the limiting member 3, the rotary valve changes from the second state to the first state, and the valve stem assembly 4 is locked in the clockwise rotation direction. Assuming the rotary valve is closed in this state, to open it, the valve stem assembly 4 needs to be rotated counterclockwise along the axial direction, changing the rotary valve from the first state to the second state. When the valve stem assembly 4 rotates counterclockwise along the axial direction until it abuts against the limiting member 3, the rotary valve changes from the second rotation to the first state, and the valve stem assembly 4 is locked in the counterclockwise rotation direction; in this state, the rotary valve is open. However, this application is not limited to this. When the valve stem assembly 4 rotates clockwise along the axial direction until it abuts against the limiting member 3, the rotary valve in this state can also be open; conversely, when the valve stem assembly 4 rotates counterclockwise along the axial direction until it abuts against the limiting member 3, the rotary valve in this state is closed. Based on this design, the limiting component 3 of the rotary valve in this embodiment is located in the sealing cavity 20 and will not be affected by rust, biological coverage, surface scale, etc. Therefore, it can still maintain accurate limiting after long-term use, ensuring the flow when the rotary valve is opened and the sealing when it is closed, and increasing the service life of the rotary valve.

[0035] Specifically, refer to Figure 1 , Figure 2As shown, the valve stem assembly 4 in this embodiment includes a valve stem 41 rotatably mounted in the valve cover 1 and a control shaft 42 rotatably mounted in the top cover 2. The control shaft 42 is provided with a limiting block 423 that cooperates with the limiting member 3. In a first state, the limiting block 423 abuts against the limiting member 3, and in a second state, the limiting block 423 is separated from the limiting member 3. The control shaft 42 has a mounting groove 424 on its surface facing the valve stem 41. The end of the valve stem 41 facing the control shaft 42 is engaged in the mounting groove 424, so that the valve stem 41 can be rotated by controlling the rotation of the control shaft 42. Of course, this application is not limited to this; the valve stem 41 may also have a limiting block 423, or both the control shaft 42 and the valve stem 41 may have limiting blocks 423. In all cases, the rotation of the valve stem assembly 4 can be limited by the cooperation of the limiting block 423 and the limiting member 3.

[0036] Furthermore, refer to Figure 2 , Figure 3 As shown, the control shaft 42 in this embodiment includes a rod 421 rotatably mounted to the top cover 2 and a head 422 disposed on the end of the rod 421 facing the valve stem 41. The head 422 is provided with a plurality of limiting blocks 423 circumferentially, and the limiting member 3 is at least partially located between two adjacent limiting blocks 423. According to this design, when the control shaft 42 rotates around the shaft in a predetermined rotation direction, relative rotation occurs between the limiting member 3 and the limiting blocks 423. Since the limiting block 423 has two opposing sides, in the first state, the first or second side of the limiting block 423 abuts against the limiting member 3, therefore the limiting block 423 cannot continue to rotate around the shaft in the predetermined rotation direction. In the second state, both the first and second sides of the limiting block 423 are separated from the limiting member 3, therefore the limiting block 423 can continue to rotate relative to the limiting member 3.

[0037] Preferably, refer to Figure 3 As shown, in this embodiment, the limiting block 423 includes a first limiting block 4231 and a second limiting block 4232 arranged opposite to each other, and the limiting member 3 includes a first limiting member 31 and a second limiting member 32 arranged opposite to each other. The symmetrical structure design ensures that the force on the control shaft 42 is more balanced when the limiting block 423 and the limiting member 3 abut against each other, which can enhance the structural reliability and ensure accurate positioning.

[0038] Preferably, refer to Figure 3 As shown, there is a gap between the limiting member 3 and the head 422 in this embodiment. This design prevents friction between the limiting member 3 and the head 422 of the control shaft 42 when rotating, making the rotation of the control shaft 42 smoother and easier to operate.

[0039] Reference Figure 2 , Figure 4As shown, the valve stem assembly 4 in this embodiment also includes a pressure cap 43 located in the sealing cavity 20 and fitted onto the valve cover 1. The valve stem 41 is fitted into the pressure cap 43, and a cavity 40 is formed between the pressure cap 43, the valve cover 1, and the valve stem 41. The cavity 40 is filled with packing material. After the cavity 40 is filled with packing material, it can prevent the liquid medium from leaking out through the gap between the valve stem 41 and the valve cover 1. The pressure cap 43 and the valve cover 1 are fastened together by a second fastener 431. Based on this design, the packing material can be compressed to prevent gaps in the cavity 40. Preferably, a second sealing element 52 is provided between the outer wall of the pressure cap 43 and the inner wall of the valve cover 1, and a third sealing element 53 is provided between the inner wall of the pressure cap 43 and the outer wall of the valve stem 41. The second sealing element 52 can be an O-ring. The provision of the second sealing element 52 and the third sealing element 53 further ensures the sealing performance of the sealing cavity 20. The third seal 53 further ensures the sealing performance of the valve stem 41 during rotation, based on the filling material.

[0040] Optional, refer to Figure 2 As shown, in this embodiment, a first sealing element 51 is provided between the valve cover 1 and the top cover 2. Preferably, the first sealing element 51 is an O-ring. The first sealing element 51 has a bidirectional isolation function. In this embodiment, a fourth sealing element 54 is provided between the control shaft 42 and the top cover 2. According to this design, the sealing performance between the control shaft 42 and the top cover 2 is ensured.

[0041] Optional, refer to Figure 2 As shown, in this embodiment, a first thrust bearing 61 is provided between the valve stem 41 and the valve cover 1. This design reduces wear between the valve stem 41 and the valve cover 1. In this embodiment, a second thrust bearing 62 is provided between the upper surface of the control shaft 42 and the top cover 2, and a third thrust bearing 63 is provided between the lower surface of the control shaft 42 and the pressure cover 43, for axial limiting of the control shaft 42.

[0042] Optional, refer to Figure 2 As shown, in this embodiment, a first guide band 71 is provided between the valve stem 41 and the valve cover 1, and a second guide band 72 is provided between the valve stem 41 and the pressure cap 43. This design prevents wear on the contact surface between the pressure cap 43 and the valve stem 41 due to force-induced displacement of the valve stem 41. In this embodiment, a third guide band 73 is provided between the control shaft 42 and the top cover 2. This design prevents wear between the outer surface of the control shaft 42 and the inner surface of the top cover 2.

[0043] Optional, refer to Figure 3 As shown, in this embodiment, the top cover 2 is provided with an oil injection hole 22 that communicates with the sealing cavity 20, and a sealing plug 23 is installed in the oil injection hole 22. Grease can be injected into the sealing cavity 20 through the oil injection hole 22, which can lubricate, prevent corrosion and balance the pressure of the internal parts of the sealing cavity 20.

[0044] Optionally, to prevent pressure increases in the sealing cavity 20 due to temperature fluctuations or liquid medium leakage from affecting the performance of the rotary valve, refer to... Figure 1 , Figure 3 As shown, in this embodiment, the top cover 2 is provided with a vent 24 that communicates with the sealing cavity 20. The rotary valve also includes a vent valve 25 fixedly installed in the vent 24. Excess pressure can be released to the outside to ensure the normal operation of the rotary valve.

[0045] As can be seen from the above technical solutions, this utility model has the following beneficial effects:

[0046] This utility model provides a rotary valve in which the limiting component is located in the sealing cavity, and is not affected by rust, biological coverage, surface scale, etc. It can always maintain accurate limiting, ensuring the flow when the rotary valve is opened and the sealing performance when closed, thus increasing the service life of the rotary valve. In addition, oil can be injected into the sealing cavity to improve the lubrication of the rotary valve stem assembly and play a role in preventing corrosion of the structure inside the sealing cavity.

[0047] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotary valve, characterized in that The rotary valve comprises: a valve cover; a top cover fixedly installed on the valve cover and coaxially arranged with the valve cover, a sealed cavity being formed between the top cover and the valve cover; a limiting member fixedly installed on the top cover and partially arranged in the sealed cavity; a valve rod assembly rotatably installed in the valve cover and partially arranged in the sealed cavity; in a first state, the valve rod assembly abuts against the limiting member, and the valve rod assembly is locked in a predetermined rotation direction; in a second state, the valve rod assembly is separated from the limiting member, and the valve rod assembly is free to rotate.

2. The rotary valve according to claim 1, characterized in that The valve rod assembly comprises a valve rod rotatably installed in the valve cover and an override shaft rotatably installed in the top cover, and the valve rod and / or the override shaft is / are provided with a limiting block matched with the limiting member, in the first state, the limiting block abuts against the limiting member, and in the second state, the limiting block is separated from the limiting member.

3. The rotary valve of claim 2, wherein The override shaft comprises a rod body rotatably installed with the top cover and a head arranged on an end of the rod body facing the valve rod, the head is circumferentially provided with a plurality of limiting blocks, and the limiting member is at least partially arranged between two adjacent limiting blocks.

4. The rotary valve according to claim 3, characterized in that The limiting block comprises oppositely arranged first and second limiting blocks, and the limiting member comprises oppositely arranged first and second limiting members.

5. The rotary valve of claim 3, wherein The limiting member has a gap with the head.

6. The rotary valve of claim 2, wherein The valve rod assembly further comprises a gland arranged in the sealed cavity and sleeved on the valve cover, the valve rod is sleeved on the gland, and a cavity is formed between the gland, the valve cover and the valve rod, and the cavity is filled with packing.

7. A rotary valve according to claim 6, characterised in that The valve cover and the top cover are provided with a first sealing member, the valve cover and the gland are provided with a second sealing member, the gland and the valve rod are provided with a third sealing member, and the override shaft and the top cover are provided with a fourth sealing member.

8. The rotary valve of claim 6, wherein The valve rod and the valve cover are provided with a first thrust bearing, the upper surface of the override shaft and the top cover are provided with a second thrust bearing, and the lower surface of the override shaft and the gland are provided with a third thrust bearing.

9. The rotary valve of claim 6, wherein, The valve rod and the valve cover are provided with a first guide belt, the valve rod and the gland are provided with a second guide belt, and the override shaft and the top cover are provided with a third guide belt.

10. The rotary valve of claim 1, wherein The top cover is provided with an oil injection hole communicated with the sealed cavity, and a sealing plug is sealingly installed in the oil injection hole; and / or The top cover is provided with a relief port communicated with the sealed cavity, and the rotary valve further comprises a relief valve fixedly installed in the relief port.

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