Multi-layer sleeve string type pressure reducing valve

Abstract

The utility model relates to the technical field of valves, in particular to a multi-layer sleeve string type pressure reducing valve which comprises a valve body, a valve element and a sleeve arranged outside the valve element in a sleeved mode, one end of a valve cavity is connected with a liquid inlet channel, and the other end of the valve cavity is connected with a liquid outlet channel. The valve element comprises a plurality of throttling convex rings arranged at intervals in the axial direction of the valve element, a throttling groove is formed between every two adjacent throttling convex rings, a plurality of annular bosses matched with the throttling convex rings are arranged on the inner circumferential wall of the sleeve at intervals in the axial direction of the sleeve, and a middle channel communicated with the liquid outlet channel is formed between the outer circumferential wall of the sleeve and the cavity wall of the valve cavity. A plurality of circulating holes for communicating an inner cavity of the sleeve with the middle channel are radially formed in one end, far away from the liquid inlet channel, of the sleeve in a penetrating manner; first-stage pressure reduction is achieved through matching of the throttling convex ring on the valve element and the annular boss on the sleeve, second-stage pressure reduction is achieved through the circulation holes in the wall of the sleeve, the pressure reduction capacity is improved, meanwhile, the circulation capacity of the valve body is guaranteed, and therefore the overall performance of the valve body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a multi-layer sleeve series pressure-reducing valve. Background Art

[0002] With the expansion of production capacity in the coal chemical and petrochemical industries, the original control valve design parameters and structures no longer meet field requirements. In actual use, as the workload increases, the corresponding pressure drop, pressure differential, and flow rate all change, directly affecting the valve's CV value. Under conditions of large pressure drops, the original pressure-reducing structure cannot effectively maintain the pressure drop, resulting in valve vibration, cavitation, and scouring during operation.

[0003] Conventional pressure reduction and noise reduction methods follow the post-valve pressure reduction and noise reduction approach, employing a sleeve-type structure. However, this structure is limited to low-pressure differential conditions, and its pressure reduction and noise reduction capabilities are limited. Serial pressure reduction or labyrinth-type structures can effectively reduce pressure and noise, and can withstand large pressure drops. However, due to the large flow resistance, this results in a smaller valve flow capacity CV value. Under conditions with large pressure drops and requiring a larger flow capacity, the aforementioned single structure can no longer meet normal use.

[0004] In response to the above problems, in order to ensure that the valve can achieve the purpose of long-term use, in the actual inspection and maintenance process, through the summary of experience and the upgrading and transformation of the on-site valve structure, a multi-layer sleeve string pressure-reducing structure valve trim was designed by combining the sleeve type and multi-stage string structure. This can meet both the large pressure drop and the flow capacity to meet the needs of on-site use. Utility Model Content

[0005] The technical problem to be solved by the present invention is: in order to solve the problems of limited pressure reduction and noise reduction capabilities of sleeve-type structure valves in the prior art, and large flow resistance of series pressure reduction or labyrinth-type structures, a multi-layer sleeve series pressure reduction valve is provided.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solution: a multi-layer sleeve tandem pressure reducing valve, comprising a valve body having a valve cavity, a valve core slidably arranged in the valve cavity, and a sleeve sleeved outside the valve core, wherein one end of the valve cavity is connected to a liquid inlet channel, and the other end is connected to a liquid outlet channel;

[0007] The valve core includes several throttling protrusions arranged at intervals along its axial direction, and a throttling groove is formed between two adjacent throttling protrusions. The inner circumferential wall of the sleeve is provided with several annular bosses that cooperate with the throttling protrusions at intervals along its axial direction. An intermediate channel connected to the liquid outlet channel is formed between the outer circumferential wall of the sleeve and the wall of the valve cavity, and a plurality of flow holes for connecting its inner cavity and the intermediate channel are radially penetrated at one end of the sleeve away from the liquid inlet channel.

[0008] Furthermore, the sleeve includes an inner sleeve and an outer sleeve sleeved on the outside of the inner sleeve, the annular boss is located on the inner sleeve, and the flow hole is located on the outer sleeve.

[0009] Furthermore, the inner sleeve is provided with a plurality of flow windows radially extending therethrough.

[0010] Furthermore, the upstream side of the throttling groove along the fluid flow direction is a flow expansion slope, and the downstream side is a plane.

[0011] Furthermore, a valve seat support ring is provided at the connecting portion between the liquid inlet channel and the valve cavity, a valve seat is provided between the valve seat support ring and one end of the sleeve, a valve cover is provided on the valve body upper cover, and a sealing ring is provided between the other end of the sleeve and the valve cover.

[0012] Furthermore, the flow holes are provided in multiple groups along the axial direction thereof, a number of flow holes in each group are distributed along the circumference of the sleeve, and two adjacent groups of flow holes are staggered.

[0013] Furthermore, the sealing ring divides the valve cavity into a flow cavity and a balancing cavity. A balancing channel runs through the interior of the valve core along its axial direction. One end of the balancing channel is connected to the liquid inlet channel, and the other end is connected to the balancing cavity.

[0014] Furthermore, the balancing channel includes an axial hole extending along the axial direction of the valve core and an inclined hole with one end connected to the axial hole and the other end gradually deviating from the axis of the valve core.

[0015] Furthermore, a sealing member is sleeved on the outside of the valve core, and the sealing member is pressed between the sealing ring and the pressure ring.

[0016] Furthermore, a first positioning step is formed at one end of the inner sleeve close to the valve seat, and a first mating step is formed on the valve seat to abut against the first positioning step. A second positioning step is formed at one end of the inner sleeve close to the sealing ring, and a second mating step is formed on the sealing ring to abut against the second positioning step.

[0017] The beneficial effects of the present invention are as follows: the present invention first realizes the first-stage pressure reduction through the cooperation between the throttling convex ring on the valve core and the annular boss on the sleeve, and realizes the second-stage pressure reduction through the multiple flow holes on the sleeve wall, thereby improving the pressure reduction capacity while ensuring the flow capacity of the valve body, thereby improving the overall performance of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 yes Figure 1A partial enlarged view of part A;

[0021] Figure 3 It is a structural diagram of the valve core;

[0022] Figure 4 It is a structural diagram of the inner sleeve;

[0023] Figure 5 It is a schematic diagram of the structure of the coat;

[0024] Figure 6 It is the flow trajectory diagram of the fluid.

[0025] In the picture:

[0026] 1. Valve body; 101. Valve chamber; 1011. Balance chamber; 1012. Flow chamber; 102. Liquid inlet channel; 103. Liquid outlet channel; 104. Intermediate channel; 105. Support step;

[0027] 2. Valve core; 201. Throttle convex ring; 202. Throttle groove; 203. Flow expansion slope; 204. Balance channel; 2041. Axial hole; 2042. Inclined hole;

[0028] 3. Sleeve; 301. Inner sleeve; 302. Outer sleeve; 303. Annular boss; 304. Flow hole; 305. Flow window; 306. First positioning step; 307. Second positioning step;

[0029] 4. Valve seat support ring; 401. Installation step; 402. Positioning groove;

[0030] 5. Valve seat; 501. First matching step;

[0031] 6. Valve cover; 601. First limiting groove;

[0032] 7. Sealing ring; 701. Second matching step; 702. Second limiting groove;

[0033] 8. Seals;

[0034] 9. Pressure ring; 901. Ring body; 902. Extension portion. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention only in a schematic manner. Therefore, they only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) may be used solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0036] like Figure 1 and Figure 2 As shown, a multi-layer sleeve tandem pressure reducing valve comprises a valve body 1 having a valve cavity 101, a valve core 2 slidably disposed in the valve cavity 101, and a sleeve 3 sleeved on the outside of the valve core 2. One end of the valve cavity 101 is connected to a liquid inlet channel 102, and the other end is connected to a liquid outlet channel 103.

[0037] The valve core 2 includes a plurality of throttling protrusions 201 arranged at intervals along its axial direction, each throttling protrusion 201 protrudes radially from the outer peripheral wall of the valve core 2, and a throttling groove 202 is formed between two adjacent throttling protrusions 201, and the inner peripheral wall of the sleeve 3 is provided with a plurality of annular bosses 303 cooperating with the throttling protrusions 201 at intervals along its axial direction, each annular boss 303 protrudes radially from the inner peripheral wall of the sleeve 3, and the plurality of throttling protrusions 201 correspond to the plurality of annular bosses 303 one by one; when the valve is closed, the outer peripheral wall of each throttling protrusion 201 fits tightly with the inner peripheral wall of the annular boss 303, and when the valve is opened, the throttling protrusion 201 and the annular boss 303 are staggered to form an opening, and after the fluid enters the valve cavity 101 from the liquid inlet channel 102, it first enters the first throttling groove 202, and then enters the second throttling groove 202 from the opening, and so on and so forth, entering each throttling groove 202 through each opening in turn, thereby producing a throttling effect.

[0038] An intermediate channel 104 communicating with the liquid outlet channel 103 is formed between the outer peripheral wall of the sleeve 3 and the wall of the valve cavity 101, and a plurality of flow holes 304 for communicating its inner cavity with the intermediate channel 104 are radially penetrated at one end of the sleeve 3 away from the liquid inlet channel 102.

[0039] When the valve is opened, the fluid enters the valve cavity 101 from the liquid inlet channel 102, and then enters each throttling groove 202 through each opening in turn. During the process, the direction of the fluid is constantly changed and the width of the opening is smaller than the width of the throttling groove 202, thereby achieving a first-stage pressure reduction. When the fluid reaches the last-stage throttling groove 202 (i.e., the throttling groove 202 away from the valve cavity 101), it enters the intermediate channel 104 through each flow hole 304 for a second-stage pressure reduction, and flows from the intermediate channel 104 into the liquid outlet channel 103. Compared with the general sleeve structure (i.e., a flow hole 304 is opened on the sleeve 3), this solution adopts a valve core 2 formed by a throttling convex ring 201 and a throttling groove 202, increases the throttling structure of the valve core 2, and improves the overall throttling capacity of the valve from the beginning. Compared with the multi-stage serial pressure reduction structure, it adopts multiple flow holes 304 to replace the outlet in the multi-stage serial pressure reduction structure, thereby improving the flow capacity. Figure 6 shown.

[0040] In some examples, such as Figure 1 and Figure 2As shown, the sleeve 3 includes an inner sleeve 301 and an outer sleeve 302 sleeved on the outside of the inner sleeve 301, the annular boss 303 is located on the inner sleeve 301, the flow hole 304 is located on the outer sleeve 302, and the inner sleeve 301 is embedded in the outer sleeve 302 to form a combined sleeve 3, which reduces the processing difficulty.

[0041] In some examples, such as Figure 4 As shown, the inner sleeve 301 is provided with a plurality of flow windows 305 radially therethrough, that is, the inner sleeve 301 is hollowed out, thereby improving the flow capacity of the fluid. The flow windows 305 can be rectangular, circular, elliptical, or a combination of rectangular and semicircular shapes, etc., in various regular or irregular shapes to meet different flow requirements of the valve.

[0042] In some examples, such as Figure 1 As shown, a valve seat support ring 4 is provided at the communicating portion between the liquid inlet channel 102 and the valve cavity 101, a valve seat 5 is provided between the valve seat support ring 4 and one end of the sleeve 3, a valve cover 6 is provided on the valve body 1, and a sealing ring 7 is provided between the other end of the sleeve 3 and the valve cover 6, that is, the valve seat support ring 4 seals the bottom of the sleeve 3, and the sealing ring 7 seals the top of the sleeve 3.

[0043] A supporting step 105 is formed on the inner peripheral wall of the valve body 1, and an installation step 401 is formed on the outer peripheral wall of the valve seat support ring 4 for abutting against the supporting step 105. The supporting step 105 and the installation step 401 cooperate to support the valve seat support ring 4 to limit its position; a recess is formed on the side of the valve seat support ring 4 close to the valve seat 5, and a positioning groove 402 is formed for the valve seat 5 to be inserted into. The valve seat 5 can be positioned after being inserted into the positioning groove 402.

[0044] In some examples, such as Figure 3 As shown, the upstream side of the throttling groove 202 along the fluid flow direction is a flow expansion slope 203, and the flow expansion slope 203 gradually tilts along the direction of the sleeve 3 toward the valve core 2 away from the liquid inlet channel 102. On the one hand, it increases the volume of the throttling groove 202 and improves the flow capacity. On the other hand, it can guide the fluid. The downstream side of the throttling groove 202 is a plane, which is used to shear the fluid to reduce its kinetic energy, thereby achieving pressure reduction.

[0045] In some examples, such as Figure 1 and Figure 2 As shown, the flow holes 304 are provided in multiple groups along the axial direction thereof, and the flow holes 304 in each group are distributed circumferentially along the sleeve 3 , and two adjacent groups of flow holes 304 are staggered, thereby increasing the number of flow holes 304 and improving the flow capacity.

[0046] In some examples, such as Figure 1 and Figure 2As shown, the sealing ring 7 divides the valve cavity 101 into a flow cavity 1012 and a balancing cavity 1011. A balancing channel 204 extends axially through the interior of the valve core 2. One end of the balancing channel 204 communicates with the liquid inlet channel 102, and the other end communicates with the balancing cavity 1011. When the valve is closed, the pressure in the liquid inlet channel 102 is very high and acts entirely on the bottom of the valve core 2, resulting in an imbalance in the upper and lower pressures of the valve core 2, which is prone to vibration. The provision of the balancing channel 204 connects the liquid inlet channel 102 with the balancing cavity 1011, allowing fluid to enter the balancing cavity 1011 from the liquid inlet channel 102, making the pressures at the upper and lower positions of the valve core 2 equal, thereby improving the overall performance of the valve.

[0047] In some examples, such as Figure 2 As shown, the balancing channel 204 includes an axial hole 2041 extending axially along the valve core 2 and an inclined hole 2042 whose one end is connected to the axial hole 2041 and the other end gradually deviates from the axis of the valve core 2. Since a valve stem is connected to the top of the valve core 2, the inclined hole 2042 can avoid the valve stem.

[0048] In some examples, such as Figure 2 As shown, the valve core 2 is externally sleeved with a sealing member 8, which may be but is not limited to an O-ring or a metal elastic sealing ring, etc. The sealing member 8 is pressed between the sealing ring 7 and the pressure ring 9, and the pressure ring 9 includes a ring body 901 and an extension portion 902 radially extending from the inner circumferential wall of the ring body 901. The inner wall of the valve cover 6 is recessed to form a first limiting groove 601 for the pressure ring 9 to be snapped into, and the inner circumferential wall of the sealing ring 7 is recessed to form a second limiting groove 702 for the extension portion 902 to be snapped into. The pressure ring 9 is pressed between the valve cover 6 and the sealing ring 7 through the first limiting groove 601 and the second limiting groove 702, and the sealing member 8 is confined in the second limiting groove 702, thereby improving the sealing effect.

[0049] In some examples, a first positioning step 306 is formed at one end of the inner sleeve 301 close to the valve seat 5, and a first mating step 501 is formed on the valve seat 5 to abut against the first positioning step 306. A second positioning step 307 is formed at one end of the inner sleeve 301 close to the sealing ring 7, and a second mating step 701 is formed on the sealing ring 7 to abut against the second positioning step 307. The sleeve 3 is confined between the valve seat 5 and the sealing ring 7 by the first positioning step 306 mating with the first mating step 501 and the second positioning step 307 mating with the second mating step 701.

[0050] Working principle:

[0051] When the valve is closed, the fluid in the liquid inlet channel 102 enters the balance chamber 1011 through the axial hole 2041 and the inclined hole 2042 in sequence, making the pressure at the upper and lower positions of the valve core 2 equal.

[0052] When the valve is opened, the fluid enters the valve cavity 101 from the liquid inlet channel 102, and then enters each throttling groove 202 through each opening in turn. During the process, the direction of the fluid is constantly changed and the opening width is smaller than the width of the throttling groove 202, thereby achieving a first-stage pressure reduction. When the fluid reaches the last-stage throttling groove 202 (that is, the throttling groove 202 away from the valve cavity 101), it enters the intermediate channel 104 through each flow hole 304 for a second-stage pressure reduction, and flows from the intermediate channel 104 into the liquid outlet channel 103.

[0053] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A multi-layer sleeve series pressure reducing valve, characterized by: The valve body (1) comprises a valve cavity (101), a valve core (2) slidably arranged in the valve cavity (101), and a sleeve (3) sleeved on the outside of the valve core (2); one end of the valve cavity (101) is connected to a liquid inlet channel (102), and the other end is connected to a liquid outlet channel (103); The valve core (2) includes a plurality of throttling protrusions (201) arranged at intervals along its axial direction, a throttling groove (202) is formed between two adjacent throttling protrusions (201), the inner peripheral wall of the sleeve (3) is provided with a plurality of annular bosses (303) cooperating with the throttling protrusions (201) at intervals along its axial direction, an intermediate channel (104) connected to the liquid outlet channel (103) is formed between the outer peripheral wall of the sleeve (3) and the wall of the valve cavity (101), and a plurality of flow holes (304) for connecting its inner cavity with the intermediate channel (104) are radially penetrated at one end of the sleeve (3) away from the liquid inlet channel (102).

2. The multi-layer sleeve tandem pressure reducing valve according to claim 1, characterized in that: The sleeve (3) comprises an inner sleeve (301) and an outer sleeve (302) sleeved on the outside of the inner sleeve (301); the annular boss (303) is located on the inner sleeve (301); and the flow hole (304) is located on the outer sleeve (302).

3. The multi-layer sleeve tandem pressure reducing valve according to claim 2, characterized in that: The inner sleeve (301) is provided with a plurality of flow windows (305) extending radially therethrough.

4. The multi-layer sleeve tandem pressure reducing valve according to claim 1, characterized in that: The upstream side of the throttling groove (202) along the fluid flow direction is a flow expansion slope (203), and the downstream side is a flat surface.

5. The multi-layer sleeve tandem pressure reducing valve according to claim 2, characterized in that: A valve seat support ring (4) is provided at the communicating portion between the liquid inlet channel (102) and the valve cavity (101), a valve seat (5) is provided between the valve seat support ring (4) and one end of the sleeve (3), a valve cover (6) is provided on the upper cover of the valve body (1), and a sealing ring (7) is provided between the other end of the sleeve (3) and the valve cover (6).

6. The multi-layer sleeve tandem pressure reducing valve according to claim 1, characterized in that: The circulation holes (304) are provided in multiple groups along the axial direction thereof, and a number of circulation holes (304) in each group are distributed along the circumference of the sleeve (3), and two adjacent groups of circulation holes (304) are staggered.

7. The multi-layer sleeve tandem pressure reducing valve according to claim 5, characterized in that: The sealing ring (7) divides the valve cavity (101) into a flow cavity (1012) and a balancing cavity (1011). A balancing channel (204) runs through the interior of the valve core (2) along its axial direction. One end of the balancing channel (204) is connected to the liquid inlet channel (102), and the other end is connected to the balancing cavity (1011).

8. The multi-layer sleeve tandem pressure reducing valve according to claim 7, characterized in that: The balancing channel (204) comprises an axial hole (2041) extending axially along the valve core (2) and an inclined hole (2042) having one end connected to the axial hole (2041) and the other end gradually deviating from the axis of the valve core (2).

9. The multi-layer sleeve tandem pressure reducing valve according to claim 5, characterized in that: The valve core (2) is externally sleeved with a sealing member (8), and the sealing member (8) is pressed between the sealing ring (7) and the pressure ring (9).

10. The multi-layer sleeve tandem pressure reducing valve according to claim 5, characterized in that: A first positioning step (306) is formed on one end of the inner sleeve (301) close to the valve seat (5), and a first matching step (501) is formed on the valve seat (5) to abut against the first positioning step (306). A second positioning step (307) is formed on one end of the inner sleeve (301) close to the sealing ring (7), and a second matching step (701) is formed on the sealing ring (7) to abut against the second positioning step (307).

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