A multi-layer squirrel cage piston regulating valve and pressure regulating method

Abstract

The application discloses a piston type regulating valve with a multi-layer squirrel cage and a pressure regulating method, which comprises a main valve body, a secondary valve body, a valve seat, a valve core chamber, a piston, a control assembly, a squirrel cage sleeve and a switching assembly. The multi-layer squirrel cage sleeve is fixed to one side of the piston adjacent to the secondary valve body. The outer wall of the outermost squirrel cage sleeve is tightly attached to the inner wall of the secondary valve body and forms a sliding fit relationship with the inner wall. The multi-layer squirrel cage sleeve is provided with through holes on the surface. There is a gap between the upper and lower squirrel cage sleeves. The switching assembly is arranged to seal the gap adjacent to the outlet of the secondary valve body when the pipeline is in a working condition with a design pressure or a small change in flow. When the pipeline is in a working condition with a design pressure or a large change in flow, the switching assembly is used to synchronously adjust the size of the flow area of the multi-layer squirrel cage sleeve. The application can complete the energy dissipation operation under high water pressure and can control the flow and pressure.

Description

Technical Field

[0001] This invention relates to the field of pipeline valve technology, specifically to a multi-layer squirrel cage piston-type regulating valve and pressure regulating method. Background Technology

[0002] Existing patent CN205401769U discloses a squirrel-cage piston control valve, including a valve body, a valve core chamber, and an adjusting device disposed in the valve core chamber. The adjusting device includes a control valve shaft, a crank, a connecting rod, and a cylindrical piston. The connecting rod is fixedly connected to the cylindrical piston through a connecting frame. The control valve shaft is connected to the connecting rod through the crank. Driven by the crank and the connecting rod, the control valve shaft can control the cylindrical piston to reciprocate within the valve core chamber. The cylindrical piston is provided with a squirrel-cage sleeve, and the surface of the squirrel-cage sleeve is densely covered with numerous through holes, the cross-section of which is conical.

[0003] Although the above-mentioned patent can make water flow at high speed through the squirrel cage sleeve and the through hole of the conical structure, and form an impact in the middle of the pipe to reduce cavitation, it still has the following disadvantages: 1) The use of a single-stage squirrel cage sleeve is prone to pressure reduction difficulties and severe cavitation, and is not suitable for high-pressure water conditions; 2) It cannot be flexibly applied to working conditions with different water pressure and flow rate changes, and has a narrow range of applications.

[0004] Based on this, the present invention aims to provide a piston-type regulating valve and pressure regulation method for a multi-layer rat cage to address the above-mentioned technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a multi-layer squirrel cage piston-type regulating valve and a pressure regulating method. The present invention features a novel structural design. Based on the piston-type regulating valve, it optimizes the single-stage squirrel cage form into a multi-stage pressure-reducing structure, thereby achieving the goal of stable, reliable, and cavitation-free pressure reduction and flow regulation under high pressure differentials.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] A piston-type regulating valve for a multi-layer squirrel cage includes a main valve body, a secondary valve body, a valve seat, a valve core chamber, a piston, and a control assembly. The control assembly controls the reciprocating motion of the piston within the valve core chamber. It also includes:

[0008] The multi-layered squirrel cage sleeve is fixed to the side of the piston adjacent to the secondary valve body. The outermost layer of the squirrel cage sleeve has its outer wall tightly attached to the inner wall of the secondary valve body and forms a sliding fit with it. The surfaces of the multi-layered squirrel cage sleeves are all provided with through holes, and there is a gap between the upper and lower layers of the squirrel cage sleeves.

[0009] And a switching component, wherein the switching component is configured to: when the pipeline is under conditions where the design pressure or flow rate changes little, the switching component is used to seal the outlet of the gap adjacent to the side of the secondary valve body; and when the pipeline is under conditions where the design pressure or flow rate changes significantly, the switching component is used to synchronously adjust the size of the flow area on the multi-layer squirrel cage sleeve.

[0010] Preferably, the switching component includes a sealing ring, which is configured such that when the pipeline is under conditions where the design pressure or flow rate changes are small, the sealing ring is located at the outlet of the gap adjacent to the side of the secondary valve body and forms a sealing fit with it.

[0011] Preferably, the switching component includes a retaining ring disposed on the secondary valve body and aligned with the axial direction of the squirrel cage sleeve. The retaining ring is configured such that when the pipeline is under conditions of large changes in design pressure or flow rate, the retaining ring extends into the gap and closely fits with the walls of the multiple layers of the squirrel cage sleeve, forming a sliding fit relationship with it.

[0012] Preferably, the length of the retaining ring is not less than the gap length, and the thickness of the retaining ring is consistent with the gap height.

[0013] Preferably, the through holes on the upper and lower cage-type sleeves should be staggered in the vertical direction.

[0014] Preferably, the control assembly includes a valve shaft, a crank, and a connecting rod. The connecting rod is connected to the piston via a connecting bracket, and the valve shaft is connected to the connecting rod via the crank. Driven by the crank and the connecting rod, the valve shaft can control the piston to reciprocate within the valve chamber.

[0015] Preferably, the valve core chamber is provided with a guide rail aligned with the piston axis, and the guide rail and the piston form a sliding fit relationship.

[0016] Preferably, the piston is a cylindrical piston.

[0017] Preferably, a valve seat sealing ring is provided on the valve seat, and a valve core sealing ring is provided on the valve core chamber.

[0018] A pressure regulating method for a piston-type regulating valve in a multi-layer squirrel cage includes:

[0019] When the pipeline is under operating conditions with small changes in design pressure or flow rate, the sealing ring of the switching component is used to seal the outlet of the gap near the auxiliary valve body. The control component pulls the squirrel cage sleeve to connect the main valve body cavity and the squirrel cage sleeve cavity. At this time, the water flows from the main valve body cavity through the through hole on the outer squirrel cage sleeve to the gap for a first pressure relief, and then flows from the through hole on the inner squirrel cage sleeve to the squirrel cage sleeve cavity for a second pressure relief.

[0020] When the pipeline is under conditions of large changes in design pressure or flow rate, the retaining ring of the switching component is inserted into the gap and tightly fits the wall of the multi-layer squirrel cage sleeve. The control component pulls the squirrel cage sleeve to connect the main valve body cavity and the squirrel cage sleeve cavity. At this time, the water flows from the main valve body cavity through the through hole on the outer squirrel cage sleeve to the gap for the first pressure relief, and then flows from the through hole on the inner squirrel cage sleeve to the squirrel cage sleeve cavity for the second pressure relief.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] Based on the piston-type regulating valve, this invention optimizes the single-stage squirrel cage structure into a multi-stage pressure reduction structure to achieve the goal of stable, reliable, and cavitation-free pressure reduction and flow regulation under high pressure differential.

[0023] This invention enables the pressure regulating valve to be used under two different operating conditions by setting a switching component (a condition with small changes in design pressure or flow rate and a condition with large changes in design pressure or flow rate). Specifically, when the sealing ring of the switching component seals the gap outlet, the opening degree of the outermost squirrel cage sleeve is actually adjusted during the valve opening and closing process, which is suitable for the condition with small changes in design pressure or flow rate; when the retaining ring of the switching component extends into the gap, the opening degree of each squirrel cage sleeve is adjusted simultaneously during the valve opening and closing process, which is suitable for the condition with large changes in design pressure or flow rate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the cross-sectional structure of the pressure regulating valve of the present invention under the first working condition (the valve is partially open);

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the pressure regulating valve of the present invention under the first operating condition (valve fully closed);

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of the pressure regulating valve of the present invention under the second operating condition (the valve is partially open);

[0027] Figure 4 This is a schematic diagram of the cross-sectional structure of the pressure regulating valve of the present invention under the second operating condition (valve fully closed);

[0028] Figure 5 This is a partial cross-sectional structural diagram of the pressure regulating valve of the present invention under the first or second operating condition.

[0029] Reference numerals: 1. Main valve body; 2. Secondary valve body; 3. Valve seat; 31. Valve seat seal ring; 4. Valve core chamber; 41. Valve core seal ring; 5. Piston; 6. Squirrel cage sleeve; 61. Through hole; 62. Clearance; 7. Control component; 71. Valve shaft; 72. Crank; 73. Connecting rod; 74. Connecting bracket; 75. Guide rail; 76. Inner bushing; 77. Crank pin; 78. Outer bushing; 81. Seal ring; 82. Retaining ring. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present patent. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present patent.

[0031] like Figure 1-5 As shown, the present invention provides a piston-type regulating valve with a multi-layer squirrel cage, comprising a main valve body 1, a secondary valve body 2, a valve seat 3, a valve core chamber 4, a piston 5, a squirrel cage sleeve 6, a control component 7, and a switching component. A valve seat sealing ring 31 is provided on the valve seat 3, and a valve core sealing ring 41 is provided on the valve core chamber 4.

[0032] The piston 5 is configured as a cylindrical piston 5. The control assembly 7 includes a valve shaft 71, a crank 72, a connecting rod 73, a guide rail 75, an inner bushing 76, a crank pin 77, and an outer bushing 78. The connecting rod 73 is connected to the piston 5 through a connecting bracket 74, and the valve shaft 71 is connected to the connecting rod 73 through the crank 72. The guide rail 75 is located inside the valve core chamber 4 and is aligned with the axis of the piston 5. The guide rail 75 and the piston 5 form a sliding fit relationship. Driven by the crank 72 and the connecting rod 73, the valve shaft 71 can control the piston 5 to reciprocate on the guide rail 75 inside the valve core chamber 4.

[0033] A multi-layered squirrel-cage sleeve 6 is fixed to the side of the piston 5 adjacent to the secondary valve body 2. The outermost squirrel-cage sleeve 6 has its outer wall tightly fitted with the inner wall of the secondary valve body 2, forming a sliding fit. Each layer of the squirrel-cage sleeve 6 has through holes 61, and there is a gap 62 between the upper and lower layers. The through holes 61 on the upper and lower layers of the squirrel-cage sleeve 6 are staggered in the vertical direction. When water flows through the squirrel-cage sleeve 6, it is restricted / guided by the through holes 61 on the circumference of the squirrel-cage sleeve 6, forming a counter-current flow at the outlet before flowing downstream. The pressure reduction and flow regulation process is completed by the valve opening. This invention optimizes the single-stage squirrel-cage form into a multi-stage pressure reduction structure to achieve the goal of stable, reliable, and cavitation-free pressure reduction and flow regulation under high pressure differential.

[0034] like Figure 1 and 2 As shown, the switching component includes a sealing ring 81. The sealing ring 81 is configured such that, when the pipeline is under conditions of small design pressure or flow rate variation (first condition), the sealing ring 81 is positioned at the outlet of the gap 62 near the secondary valve body 2 and forms a sealing fit with it. During valve opening and closing, what is actually adjusted is the opening degree (i.e., the flow area) of the outermost squirrel-cage sleeve 6. The sealing ring 81 only needs to seal the outlet of the gap 62; the sealing method between the sealing ring 81 and the gap 62 can be a conventional selection, such as an embedded seal.

[0035] like Figure 3 and 4 As shown, the switching component includes a retaining ring 82 disposed on the secondary valve body 2 and aligned with the axial direction of the squirrel cage sleeve 6. The retaining ring 82 is configured such that when the pipeline is under conditions of large design pressure or flow rate changes (second operating condition), the retaining ring 82 extends into the gap 62 and closely contacts the wall surface of the multi-layer squirrel cage sleeve 6, forming a sliding fit with it. During valve opening and closing, the retaining ring 82 can synchronously adjust the opening degree (i.e., flow area) of the multi-layer squirrel cage sleeve 6.

[0036] The length of the retaining ring 82 is not less than the length of the gap 62, so that when the valve is fully closed, the retaining ring 82 can block the through hole 61 on the multi-layer squirrel cage sleeve 6; the thickness of the retaining ring 82 is the same as the height of the gap 62 to enhance the sealing performance of the retaining ring 82, which can ensure that the water flows only through the through hole 61 and provides pressure relief and energy dissipation effect.

[0037] Under the design operating conditions of the valve (the flow / pressure conditions given by the user), the following relationship should be satisfied as much as possible between the internal pressure P1 of the main valve body 1, the internal pressure P2 of the clearance 62, and the internal pressure P3 of the squirrel cage sleeve 6.

[0038] P1:P2≈P2:P3; P1 / P2 / P3 refer to absolute pressure.

[0039] Based on the above structural design, the present invention also provides a pressure regulating method for a piston-type regulating valve in a multi-layer squirrel cage, comprising:

[0040] When the pipeline is under the condition of small changes in design pressure or flow rate, the sealing ring 81 of the switching component is used to seal the outlet of the gap 62 near the auxiliary valve body 2, and the control component 7 pulls the squirrel cage sleeve 6 to conduct the main valve body 1 cavity and the squirrel cage sleeve 6 cavity. At this time, the water flows from the main valve body 1 cavity through the through hole 61 on the outer squirrel cage sleeve 6 to the gap 62 for the first pressure relief, and then flows from the through hole 61 on the inner squirrel cage sleeve 6 to the squirrel cage sleeve 6 cavity for the second pressure relief.

[0041] When the pipeline is under conditions of large changes in design pressure or flow rate, the retaining ring 82 of the switching component extends into the gap 62 and fits tightly against the wall of the multi-layer squirrel cage sleeve 6. The control component 7 pulls the squirrel cage sleeve 6 to connect the main valve body 1 cavity and the squirrel cage sleeve 6 cavity. At this time, the water flows from the main valve body 1 cavity through the through hole 61 on the outer squirrel cage sleeve 6 to the gap 62 for the first pressure relief, and then flows from the through hole 61 on the inner squirrel cage sleeve 6 to the squirrel cage sleeve 6 cavity for the second pressure relief.

[0042] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use the piston-type regulating valve and pressure regulating method for a multi-layer rat cage according to this invention, and can achieve the positive effects described in this invention.

[0043] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0044] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

[0046] The above description is merely a preferred embodiment of the present invention, but the present invention is not limited to the specific embodiments described above. Those skilled in the art can make various modifications, additions, or substitutes with similar methods without departing from the principles of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A piston-type regulating valve for a multi-layer squirrel cage, comprising a main valve body (1), a secondary valve body (2), a valve seat (3), a valve core chamber (4), a piston (5), and a control assembly (7), wherein the control assembly (7) is used to control the reciprocating motion of the piston (5) within the valve core chamber (4); characterized in that, Also includes: A multi-layered squirrel cage sleeve (6) is fixed to the side of the piston (5) adjacent to the secondary valve body (2). The outermost layer of the squirrel cage sleeve (6) is in close contact with the inner wall of the secondary valve body (2) and forms a sliding fit relationship with it. The surfaces of the multi-layered squirrel cage sleeves (6) are all provided with through holes (61), and there is a gap (62) between the upper and lower layers of the squirrel cage sleeves (6). And a switching component, wherein the switching component is configured to: when the pipeline is in a working condition where the design pressure or flow rate changes little, the switching component is used to seal the outlet of the gap (62) adjacent to the side of the secondary valve body (2); when the pipeline is in a working condition where the design pressure or flow rate changes greatly, the switching component is used to synchronously adjust the size of the flow area on the multi-layer squirrel cage sleeve (6); The switching assembly includes a sealing ring (81) and a retaining ring (82) disposed on the secondary valve body (2) and aligned with the axial direction of the squirrel cage sleeve (6); the sealing ring (81) is configured such that when the pipeline is under conditions where the design pressure or flow rate changes are small, the sealing ring (81) is disposed at the outlet of the gap (62) adjacent to the secondary valve body (2) and forms a sealing fit with it; the retaining ring (82) is configured such that when the pipeline is under conditions where the design pressure or flow rate changes are large, the retaining ring (82) extends into the gap (62) and closely fits against the wall surface of the multi-layer squirrel cage sleeve (6) and forms a sliding fit with it.

2. The piston-type regulating valve for the multi-layer rat cage according to claim 1, characterized in that: The length of the retaining ring (82) is not less than the length of the gap (62), and the thickness of the retaining ring (82) is consistent with the height of the gap (62).

3. The piston-type regulating valve for the multi-layer rat cage according to claim 1, characterized in that: The through holes (61) on the upper and lower cage sleeves (6) need to be staggered in the vertical direction.

4. The piston-type regulating valve for the multi-layer rat cage according to claim 1, characterized in that: The control component (7) includes a valve shaft (71), a crank (72) and a connecting rod (73). The connecting rod (73) is connected to the piston (5) through a connecting bracket (74). The valve shaft (71) is connected to the connecting rod (73) through the crank (72). Driven by the crank (72) and the connecting rod (73), the valve shaft (71) can control the piston (5) to reciprocate within the valve core chamber (4).

5. The piston-type regulating valve for a multi-layer rat cage according to claim 1, characterized in that: The valve core chamber (4) is provided with a guide rail (75) that is aligned with the axis of the piston (5), and the guide rail (75) and the piston (5) form a sliding fit relationship.

6. The piston-type regulating valve for the multi-layer rat cage according to claim 1, characterized in that: The piston (5) is a cylindrical piston (5).

7. The piston-type regulating valve for the multi-layer rat cage according to claim 1, characterized in that: A valve seat sealing ring (31) is provided on the valve seat (3), and a valve core sealing ring (41) is provided on the valve core chamber (4).

8. A pressure regulating method for a piston-type regulating valve of a multi-layer squirrel cage as described in any one of claims 1-7, characterized in that, include: When the pipeline is under the condition of small design pressure or flow rate change, the sealing ring (81) of the switching component is used to seal the outlet of the gap (62) near the side of the auxiliary valve body (2), and the control component (7) pulls the squirrel cage sleeve (6) to open the main valve body (1) cavity and the squirrel cage sleeve (6) cavity. At this time, the water flows from the main valve body (1) cavity through the through hole (61) on the outer squirrel cage sleeve (6) to the gap (62) for a first pressure relief, and then flows from the through hole (61) on the inner squirrel cage sleeve (6) to the squirrel cage sleeve (6) cavity for a second pressure relief. When the pipeline is under conditions where the design pressure or flow rate changes significantly, the retaining ring (82) of the switching component is inserted into the gap (62) and tightly fitted to the wall of the multi-layer squirrel cage sleeve (6). The control component (7) pulls the squirrel cage sleeve (6) to connect the main valve body (1) cavity and the squirrel cage sleeve (6) cavity. At this time, the water flows from the main valve body (1) cavity through the through hole (61) on the outer squirrel cage sleeve (6) to the gap (62) for a first pressure relief, and then flows from the through hole (61) on the inner squirrel cage sleeve (6) to the squirrel cage sleeve (6) cavity for a second pressure relief.

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