Anti-cavitation labyrinth type single-seat valve core regulating valve structure

Abstract

The utility model provides an anti-cavitation labyrinth-type single-seat valve core regulating valve structure, which comprises a valve body, a valve core, a valve core, a valve core, a valve core, a valve core, a valve core, a valve core and a valve core, the valve seat assembly is installed in the valve cavity of the valve body, the valve cavity is divided into a feeding cavity and a discharging cavity by the valve seat assembly, the valve seat assembly is provided with a fluid flow channel communicated with the feeding cavity and the discharging cavity, the fluid inlet is communicated with the feeding cavity, and the fluid outlet is communicated with the discharging cavity; the valve cover is connected with the valve body and fixes the valve seat assembly in the valve cavity; one end of the valve element assembly is arranged in the fluid flow channel, the other end of the valve element assembly penetrates through the valve cover, and the valve element assembly can move relative to the valve seat assembly to adjust the opening degree of the valve; the valve seat assembly and / or the valve element assembly are / is provided with a labyrinth groove, so that a labyrinth flow channel is formed between the valve element assembly and the valve seat assembly. According to the anti-cavitation labyrinth type single-seat valve element adjusting valve structure, the occurrence of undesirable phenomena such as cavitation, noise and vibration generated when high-pressure-difference fluid flows through the valve can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a structure of an anti-cavitation labyrinth type single-seat valve core regulating valve. Background Technology

[0002] Currently, single-seat control valves are widely used in power plants and steel mills. However, traditional single-seat control valves have a simple structure, containing only a valve core and a valve seat. During operation, they often operate at a small opening, leading to problems such as severe erosion, valve core disintegration, and internal leakage. This is because the fluid creates high pressure differentials and high flow rates as it passes through the valve internals, causing cavitation and cavitation within the valve and flow channels. This generates noise and vibration, damaging the valve core, valve seat, and other internal components, thus affecting the overall performance and service life of the control valve. Utility Model Content

[0003] This utility model provides an anti-cavitation labyrinth type single-seat valve core regulating valve structure to at least solve some of the above-mentioned technical problems existing in the prior art.

[0004] In a first aspect, embodiments of this utility model provide an anti-cavitation labyrinth type single-seat valve core regulating valve structure, comprising:

[0005] A valve body having a valve cavity and a fluid inlet and a fluid outlet communicating with the valve cavity;

[0006] A valve seat assembly is installed in the valve cavity of the valve body. The valve seat assembly divides the valve cavity into an inlet cavity and an outlet cavity. The valve seat assembly has a fluid flow channel connecting the inlet cavity and the outlet cavity. The fluid inlet is connected to the inlet cavity, and the fluid outlet is connected to the outlet cavity.

[0007] A valve cover is connected to the valve body to fix the valve seat assembly inside the valve cavity;

[0008] A valve core assembly, one end of which is disposed in the fluid flow channel and the other end of which passes through the valve cover, is movable relative to the valve seat assembly to adjust the valve opening.

[0009] The valve seat assembly and / or the valve core assembly have labyrinth grooves to form a labyrinth flow channel between the valve core assembly and the valve seat assembly.

[0010] In an optional embodiment, the valve seat assembly includes a first end and a second end opposite to each other. The valve seat assembly has a first through hole penetrating the first end and the second end. The first end abuts against the valve cover. The valve seat assembly also has a bypass hole communicating with the first through hole and the discharge chamber. The first through hole between the second end and the bypass hole forms the fluid flow channel. One end of the valve core assembly is disposed in the fluid flow channel, and the other end extends out from the first end.

[0011] In an optional embodiment, the inner surface of the fluid flow channel includes a first sealing surface and a first throttling surface, the first throttling surface being closer to the second end relative to the first sealing surface, and the outer surface of the valve core assembly includes a second sealing surface cooperating with the first sealing surface and a second throttling surface cooperating with the first throttling surface, the labyrinth groove being provided on the first throttling surface and / or the second throttling surface.

[0012] In an optional embodiment, the labyrinth groove includes a plurality of annular grooves extending circumferentially along the first or second throttling surface, and the plurality of annular grooves are distributed along the length of the fluid flow channel.

[0013] In an alternative embodiment, the plurality of annular grooves include at least one of annular grooves that are closed in the circumferential direction and annular grooves that are not closed in the circumferential direction.

[0014] In an optional embodiment, the first throttling surface and the second throttling surface are both conical surfaces.

[0015] In an optional embodiment, the inner surface of the fluid flow channel includes a first guide surface, which is close to the first end relative to the first sealing surface. The outer surface of the valve core assembly includes a second guide surface that mates with the first guide surface to guide the movement of the valve core assembly relative to the valve seat assembly. The bypass hole is located on the first guide surface.

[0016] In an optional embodiment, the total area of ​​the bypass orifice is greater than the sealing area, where the sealing area is the area of ​​the first sealing surface in contact with the second sealing surface when the valve core assembly closes the fluid flow channel.

[0017] In an optional embodiment, the total area of ​​the bypass orifice is greater than or equal to 1.2 times the sealing area.

[0018] In an optional embodiment, the valve seat assembly includes:

[0019] A valve seat is installed inside the valve cavity of the valve body, dividing the valve cavity into a feed chamber and a discharge chamber. The valve seat has a first flow passage.

[0020] A sleeve, one end of which is connected to the valve seat and the other end of which is connected to the valve cover, has a second flow passage opposite to the first flow passage, and a bypass hole is provided on the side wall of the sleeve.

[0021] One embodiment of this utility model has the following advantages or beneficial effects:

[0022] In the anti-cavitation labyrinth type single-seat valve core regulating valve structure of this utility model embodiment, the valve body has a valve cavity, and a fluid inlet and a fluid outlet communicating with the valve cavity; a valve seat assembly is installed in the valve cavity of the valve body, the valve seat assembly divides the valve cavity into a feed chamber and a discharge chamber, the valve seat assembly has a fluid flow channel communicating with the feed chamber and the discharge chamber, the fluid inlet communicating with the feed chamber, and the fluid outlet communicating with the discharge chamber; a valve cover is connected to the valve body, fixing the valve seat assembly in the valve cavity; one end of the valve core assembly is disposed in the fluid flow channel, and the other end passes through the valve cover, the valve core assembly can move relative to the valve seat assembly to adjust the valve opening; wherein, the valve seat assembly and / or the valve core assembly have labyrinth grooves to form a labyrinth flow channel between the valve core assembly and the valve seat assembly. This utility model divides the originally integral throttling region into multiple serial sub-throttling regions by forming a labyrinth flow channel between the valve core assembly and the valve seat assembly. When the fluid passes through each sub-throttling region of the labyrinth flow channel, the flow velocity is slower than that of the previous sub-throttling region. This can gradually reduce the continuous high pressure acting on the valve orifice during the valve opening and closing process, thereby converting a large pressure difference into multiple smaller pressure differences. This can effectively control the fluid flow velocity and reduce adverse phenomena such as cavitation, noise, and vibration caused by high pressure differential fluid flowing through the valve. Attached Figure Description

[0023] The above and other features and advantages of this invention will become more apparent from a detailed description of exemplary embodiments with reference to the accompanying drawings.

[0024] Figure 1 This is a cross-sectional structural schematic diagram of an anti-cavitation labyrinth type single-seat valve core regulating valve structure according to an exemplary embodiment.

[0025] Figure 2 This is a partially enlarged schematic diagram of an anti-cavitation labyrinth type single-seat valve core regulating valve structure according to an exemplary embodiment. Figure 1 ;

[0026] Figure 3 This is a partially enlarged schematic diagram of an anti-cavitation labyrinth type single-seat valve core regulating valve structure according to an exemplary embodiment. Figure 2 ;

[0027] Figure 4 This is a schematic diagram of the valve core assembly according to an exemplary embodiment;

[0028] Figure 5 This is a schematic diagram of the structure of a valve seat assembly according to an exemplary embodiment;

[0029] Figure 6 This is a schematic diagram of the valve seat structure according to an exemplary embodiment;

[0030] Figure 7 This is a schematic diagram of the sleeve structure according to an exemplary embodiment.

[0031] The reference numerals in the attached drawings are explained as follows: 1-valve body; 11-valve cavity; 111-feed cavity; 112-discharge cavity; 12-fluid inlet; 13-fluid outlet; 2-valve seat assembly; 21-fluid flow channel; 211-first sealing surface; 212-first throttling surface; 213-first guide surface; 22-valve seat; 221-first flow passage; 222-annular flange; 23-sleeve; 231-second flow passage; 24-first end; 25-second end; 26-bypass hole; 3-valve core assembly; 31-second sealing surface; 32-second throttling surface; 33-second guide surface; 34-valve plug; 35-valve stem; 4-labyrinth groove; 5-valve cover. Detailed Implementation

[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0033] The terms “a,” “one,” “the,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended meaning of inclusion and that other elements / components / etc. may exist in addition to the listed elements / components / etc.

[0034] See Figures 1 to 7 ,in, Figure 2 This is a schematic diagram of the valve in the closed state. Figure 3 This is a schematic diagram of the valve in the open state. An embodiment of this utility model discloses an anti-cavitation labyrinth type single-seat valve core regulating valve structure, including a valve body 1, a valve seat assembly 2, a valve cover 5, and a valve core assembly 3. The valve body 1 has a valve cavity 11, and a fluid inlet 12 and a fluid outlet 13 communicating with the valve cavity 11. Fluid enters the valve cavity 11 through the fluid inlet 12 and flows out through the fluid outlet 13.

[0035] Valve seat assembly 2 is installed inside valve chamber 11 of valve body 1. Valve seat assembly 2 divides valve chamber 11 into inlet chamber 111 and outlet chamber 112. Valve seat assembly 2 has a fluid flow channel 21 connecting inlet chamber 111 and outlet chamber 112. Fluid inlet 12 connects to inlet chamber 111, and fluid outlet 13 connects to outlet chamber 112. Fluid enters inlet chamber 111 through fluid inlet 12, then enters outlet chamber 112 through fluid flow channel 21, and flows out through fluid outlet 13. Valve cover 5 is connected to valve body 1, fixing valve seat assembly 2 inside valve chamber 11.

[0036] See Figure 2 and Figure 3 One end of the valve core assembly 3 is located within the fluid flow channel 21, and the other end passes through the valve cover 5. The valve core assembly 3 can move relative to the valve seat assembly 2 to adjust the valve opening. The end of the valve core assembly 3 protruding from the valve cover 5 can drive the valve core assembly 3 to move relative to the valve seat assembly 2, thereby adjusting the valve opening. As the valve opening increases, the fluid flow rate increases until the valve core assembly 3 moves relative to the valve seat assembly 2 to the maximum valve opening. As the valve opening decreases, the fluid flow rate decreases until the valve core assembly 3 moves relative to the valve seat assembly 2 to the minimum valve opening. See also... Figure 2 The minimum opening of the valve can be when the valve core assembly 3 and the valve seat assembly 2 are tightly fitted together, the valve is closed, and the fluid flow channel 21 is cut off. At this time, the fluid flow rate is 0.

[0037] The valve seat assembly 2 and / or the valve core assembly 3 have a labyrinth groove 4 to form a labyrinth flow channel between the valve core assembly 3 and the valve seat assembly 2.

[0038] This invention utilizes a labyrinth flow channel formed between the valve core assembly 3 and the valve seat assembly 2 to divide the originally unified throttling region into multiple series-connected sub-throttling regions. As the fluid flows through each sub-throttling region, it enters the labyrinth groove 4, where the fluid velocity decreases and the pressure difference diminishes. The fluid velocity in each sub-throttling region is slower than that in the previous one, resulting in a gradual decrease in velocity. This gradually reduces the continuous high pressure acting on the valve orifice during the opening and closing process, converting a large pressure difference into multiple smaller pressure differences. This effectively controls the fluid velocity and reduces adverse phenomena such as cavitation, noise, and vibration caused by high-pressure fluid flowing through the valve.

[0039] In some embodiments, the labyrinth groove 4 may be present only on the valve seat assembly 2, thereby forming a labyrinth flow channel between the valve core assembly 3 and the valve seat assembly 2. See also Figures 1 to 4 Alternatively, only the valve core assembly 3 may have a labyrinth groove 4, thereby forming a labyrinth flow channel between the valve core assembly 3 and the valve seat assembly 2. Or, both the valve seat assembly 2 and the valve core assembly 3 may have labyrinth grooves 4, thereby forming a labyrinth flow channel between the valve core assembly 3 and the valve seat assembly 2.

[0040] In some embodiments, see Figure 5 The valve seat assembly 2 includes a first end 24 and a second end 25 opposite to each other. The valve seat assembly 2 has a first through hole penetrating the first end 24 and the second end 25. The second end 25 is connected to the valve body 1, and the first end 24 abuts against the valve cover 5, thereby installing the valve seat assembly 2 within the valve cavity 11. The valve seat assembly 2 also has a bypass hole 26 connecting the first through hole and the discharge cavity 112. The first through hole between the second end 25 and the bypass hole 26 forms a fluid flow channel 21. One end of the valve core assembly 3 is disposed within the fluid flow channel 21, and the other end extends from the first end 24. Fluid enters the feed cavity 111 through the fluid inlet 12, enters the fluid flow channel 21 through the second end 25, then enters the discharge cavity 112 through the bypass hole 26, and finally flows out from the fluid outlet 13. The valve core assembly 3 moves within the fluid flow channel 21 to adjust the valve opening.

[0041] In some embodiments, see Figure 4 and Figure 5 The inner surface of the fluid flow channel 21 includes a first sealing surface 211, and the outer surface of the valve core assembly 3 includes a second sealing surface 31 that mates with the first sealing surface 211. When the valve core assembly 3 moves relative to the valve seat assembly 2, the gap between the first sealing surface 211 and the second sealing surface 31 changes, thereby adjusting the valve opening. The larger the gap between the first sealing surface 211 and the second sealing surface 31, the larger the valve opening and the greater the fluid flow rate. Conversely, the smaller the gap between the first sealing surface 211 and the second sealing surface 31, the smaller the valve opening and the smaller the fluid flow rate. When the valve core assembly 3 moves relative to the valve seat assembly 2 until the second sealing surface 31 is in contact with the first sealing surface 211, the valve closes.

[0042] In some embodiments, see Figure 4 and Figure 5The inner surface of the fluid flow channel 21 includes a first throttling surface 212, and the outer surface of the valve core assembly 3 includes a second throttling surface 32 that mates with the first throttling surface 212. The first throttling surface 212 and / or the second throttling surface 32 have labyrinth grooves 4. A throttling region is formed between the first throttling surface 212 and the second throttling surface 32. The labyrinth grooves 4 on the first throttling surface 212 and / or the second throttling surface 32 divide the throttling region between the first throttling surface 212 and the second throttling surface 32 into multiple series of sub-throttling regions, thus forming a labyrinth flow channel. When the fluid flows along the labyrinth flow channel, it flows through each sub-throttling region sequentially, thereby converting a large pressure difference into multiple smaller pressure differences. This effectively controls the fluid flow rate and reduces adverse phenomena such as cavitation, noise, and vibration caused by high pressure differential fluid flowing through the valve. The first throttling surface 212 is closer to the second end 25 relative to the first sealing surface 211. Similarly, the second throttling surface 32 is closer to the second end 25 relative to the second sealing surface 31. After the fluid flows through the labyrinth channel between the second throttling surface 32 and the first throttling surface 212, the pressure difference and flow velocity are reduced, which reduces the occurrence of adverse phenomena such as cavitation, noise and vibration generated when flowing through the first sealing surface 211 and the second sealing surface 31.

[0043] In some embodiments, see Figures 1 to 4 The labyrinth groove 4 includes multiple annular grooves extending circumferentially along the first throttling surface 212 or the second throttling surface 32, and these annular grooves are distributed along the length of the fluid flow channel 21. When the labyrinth groove 4 is located on the first throttling surface 212, the annular grooves extend circumferentially along the first throttling surface 212, and the multiple annular grooves are distributed along the length of the fluid flow channel 21, thereby dividing the throttling region between the first throttling surface 212 and the second throttling surface 32 into multiple series of sub-throttling regions. When the labyrinth groove 4 is located on the second throttling surface 32, the annular grooves extend circumferentially along the second throttling surface 32, and the multiple annular grooves are distributed along the length of the fluid flow channel 21, that is, the multiple annular grooves are distributed axially along the valve core, thereby dividing the throttling region between the first throttling surface 212 and the second throttling surface 32 into multiple series of sub-throttling regions. When annular grooves are provided on the first throttling surface 212 and the second throttling surface 32 respectively, the throttling region between the first throttling surface 212 and the second throttling surface 32 can be divided into more sub-throttling regions connected in series.

[0044] In some embodiments, the plurality of annular grooves includes at least one of circumferentially closed annular grooves and circumferentially open annular grooves. The annular grooves may or may not be closed circumferentially. The plurality of annular grooves may be circumferentially closed annular grooves, circumferentially open annular grooves, or may simultaneously include both circumferentially closed and circumferentially open annular grooves. When the plurality of annular grooves includes circumferentially open annular grooves, the openings of adjacent annular grooves are staggered circumferentially.

[0045] In some embodiments, see Figures 1 to 5 The first throttling surface 212 and the second throttling surface 32 are both conical surfaces. The first throttling surface 212 and the second throttling surface 32 are both conical surfaces, which can play a role in regulating the flow rate during the adjustment of the valve opening. They can make the fluid pass through the throttling area at a smaller flow rate when the valve is opened and closed, thereby reducing the damage to the first sealing surface 211 and the second sealing surface 31.

[0046] In some embodiments, see Figures 1 to 5 The first sealing surface 211 and the second sealing surface 31 are both conical surfaces. Setting them as cylindrical surfaces can increase the sealing area and improve the sealing effect.

[0047] In some embodiments, see Figures 1 to 5 The inner surface of the fluid flow channel 21 includes a first guide surface 213, which is close to the first end 24 relative to the first sealing surface 211. The outer surface of the valve core assembly 3 includes a second guide surface 33 that mates with the first guide surface 213 to guide the movement of the valve core assembly 3 relative to the valve seat assembly 2. A bypass hole 26 is provided on the first guide surface 213. The cooperation between the first guide surface 213 and the second guide surface 33 can reduce the vibration caused by the fluid impacting the valve core assembly 3 and increase the dynamic stability of the valve core assembly 3 relative to the valve seat assembly 2.

[0048] In some embodiments, the total area of ​​the bypass orifice 26 is greater than the sealing area, which is the area where the first sealing surface 211 and the second sealing surface 31 contact each other when the valve core assembly 3 is in the closed fluid flow channel 21 state. The fact that the total area of ​​the bypass orifice 26 is greater than the sealing area allows the fluid to flow smoothly through the bypass orifice 26 to the discharge chamber 112.

[0049] In some embodiments, the total area of ​​the bypass orifice 26 is greater than or equal to 1.2 times the sealing area. Fluid can flow smoothly through the bypass orifice 26 to the discharge chamber 112 without obstructing the flow.

[0050] In some embodiments, see Figure Figure 5 and Figure 7 The number of bypass holes 26 can be multiple, and the multiple bypass holes 26 are evenly distributed in the circumferential direction of the fluid flow channel 21.

[0051] In some embodiments, see Figure 5The valve seat assembly 2 includes a valve seat 22 and a sleeve 23. The valve seat 22 is installed in the valve cavity 11 of the valve body 1, dividing the valve cavity 11 into an inlet cavity 111 and an outlet cavity 112. The valve seat 22 has a first flow passage 221. One end of the sleeve 23 is connected to the valve seat 22, and the other end is connected to the valve cover 5. The sleeve 23 has a second flow passage 231, which is opposite to the first flow passage 221. The second flow passage 231 and the first flow passage 221 together form the first through hole of the valve seat assembly 2. A bypass hole is provided on the side wall of the sleeve 23. The valve seat assembly 2 includes a valve seat 22 and a sleeve 23, and the wall of the second flow passage 231 forms a first guide surface 213 to guide the valve core assembly 3. The cooperation between the sleeve 23 and the valve core assembly 3 can reduce the vibration caused by the fluid impacting the valve core assembly 3 and increase the dynamic stability of the valve core assembly 3 during its up-and-down movement. Meanwhile, the sleeve 23 and the valve seat 22 cooperate for positioning, improving the fit between the parts and enabling the valve core assembly 3 to be guided more precisely. The upper part of the first through hole can form the first sealing surface 211, and the lower part can form the first throttling surface 212.

[0052] Of course, the valve seat assembly 2 can also be an integral structure, with an upwardly extending extension at the upper end of the valve seat 22, and the inner wall surface of the extension forming a first guide surface 213.

[0053] In some embodiments, see Figure 4 The valve core assembly 3 may include a valve plug 34 and a valve stem 35, which may be an integral structure or a separate structure. The valve stem 35 extends from the valve cover 5 into the valve cavity 11. The outer peripheral surface of the valve plug 34 forms a second sealing surface 31 and a second throttling surface 32. The outer peripheral surface of the valve plug 34 may also form a second guide surface 33. The valve plug 34 may be divided into a throttling section, a sealing section, and a guide section along the axial direction. The outer peripheral surface of the throttling section forms the second throttling surface 32, the outer peripheral surface of the sealing section forms the second sealing surface 31, and the outer peripheral surface of the guide section forms the second guide surface 33. The outer diameter of the guide section may be larger than the outer diameters of the sealing section and the throttling section. The outer diameter of the sealing section may be larger than the outer diameter of the throttling section.

[0054] In some embodiments, see Figure 1 The valve cover 5 can be fixed to the valve body 1 by connecting and fixing it with flange studs and nuts.

[0055] In some embodiments, the feed chamber 111 and the discharge chamber 112 are connected by a second through hole. The valve seat assembly 2 may be installed inside the discharge chamber 112. See also the exemplary embodiment. Figures 1 to 5The second end 25 of the valve seat assembly 2 can be inserted into the second through hole. The inner wall of the discharge chamber 112 has a cavity surrounding the second through hole, and the outer wall of the second end 25 of the valve seat assembly 2 has an annular flange 222, which is at least partially accommodated in the cavity and is sealed to the valve body 1. In a specific implementation, a sealing ring may be provided between the annular flange 222 and the bottom surface of the cavity.

[0056] When the valve seat assembly 2 includes a valve seat 22 and a sleeve 23, the end of the valve seat 22 furthest from the sleeve 23 is the second end 25 of the valve seat assembly 2, and the end of the sleeve 23 furthest from the valve seat 22 is the first end 24 of the valve seat assembly 2. See also Figure 6 The annular flange 222 is provided on the outer wall of the valve seat 22.

[0057] In some embodiments, see Figure 1 The fluid inlet 12 is inclined from the inside out towards the discharge chamber 112. The fluid outlet 13 is inclined from the inside out towards the feed chamber 111. The line connecting the center of the outer end of the fluid inlet 12 and the center of the outer end of the fluid outlet 13 is perpendicular to the axis of the fluid flow channel 21.

[0058] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly. For example, "connect" can mean 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 embodiment of the invention based on the specific circumstances.

[0059] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0060] In this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An anti-cavitation labyrinth single seat trim valve construction characterized by, The valve body (1) has a valve cavity (11), a fluid inlet (12) and a fluid outlet (13) communicating with the valve cavity (11); the valve seat assembly (2) is installed in the valve cavity (11) of the valve body (1), and separates the valve cavity (11) into a feed cavity (111) and a discharge cavity (112); the valve seat assembly (2) has a fluid flow channel (21) communicating with the feed cavity (111) and the discharge cavity (112), the fluid inlet (12) communicates with the feed cavity (111), and the fluid outlet (13) communicates with the discharge cavity (112); the valve cover (5) is connected with the valve body (1) and fixes the valve seat assembly (2) in the valve cavity (11); the valve core assembly (3) is arranged in the fluid flow channel (21) at one end and passes through the valve cover (5) at the other end, and the valve core assembly (3) can move relative to the valve seat assembly (2) to adjust the opening degree of the valve; wherein the valve seat assembly (2) and / or the valve core assembly (3) has a labyrinth groove (4) to form a labyrinth flow channel between the valve core assembly (3) and the valve seat assembly (2). The valve seat assembly (2) includes opposite first and second ends (24) and (25), and has a first through hole penetrating the first and second ends (24) and (25); the first end (24) abuts against the valve cover (5); the valve seat assembly (2) further has a bypass hole (26) communicating with the first through hole and the discharge cavity (112); the first through hole between the second end (25) and the bypass hole (26) forms the fluid flow channel (21); one end of the valve core assembly (3) is arranged in the fluid flow channel (21), and the other end of the valve core assembly (3) extends out of the first end (24). An inner surface of the fluid flow channel (21) includes a first sealing surface (211) and a first throttling surface (212); the first throttling surface (212) is closer to the second end (25) than the first sealing surface (211); an outer surface of the valve core assembly (3) includes a second sealing surface (31) matched with the first sealing surface (211) and a second throttling surface (32) matched with the first throttling surface (212); the first throttling surface (212) and / or the second throttling surface (32) has the labyrinth groove (4). The labyrinth groove (4) includes a plurality of annular grooves extending in a circumferential direction of the first throttling surface (212) or the second throttling surface (32); and the plurality of annular grooves are distributed in a length direction of the fluid flow channel (21). The plurality of annular grooves include at least one of annular grooves closed in the circumferential direction and annular grooves not closed in the circumferential direction. The first throttling surface (212) and the second throttling surface (32) are conical surfaces, respectively.

2. The anti-cavitation labyrinth single seat spool trim valve construction of claim 1, wherein, ​ 3. The anti-cavitation labyrinth single seat spool valve trim regulator valve construction of claim 2, wherein, ​ 4. The anti-cavitation labyrinth single spool valve trim regulator valve construction of claim 3, wherein, ​ 5. The anti-cavitation labyrinth single seat spool valve trim regulator valve construction of claim 4, wherein, ​ 6. The anti-cavitation labyrinth single spool valve trim regulator valve construction of claim 3 wherein, ​ 7. The anti-cavitation labyrinth single spool valve trim regulator valve construction of claim 3 wherein, The inner surface of the fluid flow channel (21) comprises a first guide surface (213) close to the first end (24) relative to the first sealing surface (211), the outer surface of the valve core assembly (3) comprises a second guide surface (33) matched with the first guide surface (213) to guide the movement of the valve core assembly (3) relative to the valve seat assembly (2), and the bypass hole (26) is arranged on the first guide surface (213).

8. The anti-cavitation labyrinth single seat spool valve trim regulator valve construction of claim 7, wherein, The total area of the bypass hole (26) is greater than the sealing area, and the sealing area is the area of the first sealing surface (211) in contact with the second sealing surface (31) when the valve core assembly (3) closes the fluid flow channel (21).

9. The anti-cavitation labyrinth single seat spool valve trim regulator valve construction of claim 8, wherein, The total area of the bypass hole (26) is greater than or equal to 1.2 times the sealing area.

10. The anti-cavitation labyrinth single seat spool valve trim regulator valve construction of claim 7, wherein, The valve seat assembly (2) comprises: a valve seat (22) installed in the valve cavity (11) of the valve body (1) to divide the valve cavity (11) into an inlet cavity (111) and an outlet cavity (112), the valve seat (22) having a first through-flow hole (221); a sleeve (23) connected to the valve seat (22) at one end and connected to the valve cover (5) at the other end, the sleeve (23) having a second through-flow hole (231) opposite the first through-flow hole (221), and the sleeve (23) being provided with a bypass hole on the side wall.

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