Axial flow piston flow regulating valve

Abstract

This invention relates to the field of valve technology, and in particular to an axial flow piston flow regulating valve. It primarily solves the problem of low production efficiency caused by the complex structure and difficult processing of existing axial flow flow regulating valves. The valve includes a valve body, valve stem, crank, connecting rod, connecting seat, piston cylinder, permeable cylinder, at least two guide rails, a fixing ring, a first sealing ring, a second sealing ring, and a flow guide. The valve body includes an outer valve body and an inner valve body. The outer valve body has an inlet, an outlet, and an inner cavity communicating with the inlet and outlet. The inner valve body is located in the middle of the inner cavity, and has an opening at one end near the outlet. The valve stem is rotatably mounted on the valve body, with one end distributed on the outside of the outer valve body and the other end distributed within the inner valve body and connected to the crank. One end of the connecting rod is hinged to the crank. The connecting seat includes an integrally formed connecting ring and a connecting portion.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to an axial flow piston flow regulating valve. Background Technology

[0002] Existing axial flow control valves have structures such as those described in a Chinese patent application filed by China Jiliang University on May 7, 2018 (patent number 201820665629.1), which discloses an axial flow control valve. Specifically, the axial flow control valve includes: a valve core, a valve core support, a valve body, a fixing plate, a sliding friction plate, a lead screw nut, a bevel gear, a gland, a valve stem, a handle nut, a handle, a piston, a piston fixing nut, a tail rectifier, a sleeve, and a rectifier nut. The valve core support and gland are both mounted on the valve body, and the valve core, piston, and sleeve are all mounted on the valve core support. The piston is connected to the valve core via the piston fixing nut, and the fixing plate is connected to the valve core at both ends. On the bracket, the valve core is connected to the fixed plate via a screw nut. A sliding friction plate is located between the fixed plate and the screw nut. A bevel gear is connected to the fixed plate via the screw nut and the sliding friction plate. The connection between the valve stem and the bevel gear is a gear meshing connection. The valve stem is mounted on the valve body via a gland. The handle is located on the upper part of the valve stem via a handle nut. The valve core enters the valve body from the left side, passes through the valve core bracket, fixed plate, sliding friction plate, screw nut, bevel gear, piston, piston fixing nut, and exits from the right end of the tail rectifier. The left end of the tail rectifier is located on the piston, and the right end of the valve core is located on the right end of the tail rectifier via a rectifier nut. The inlet and outlet of the axial flow regulating valve are located on the same axis. It adopts an axial flow type, and with the streamlined design of the intermediate sleeve and the tail fairing, the fluid flow channel is relatively smooth, the disturbance of the fluid flowing through the regulating valve is small, and the flow separation at the tail of the sleeve is effectively avoided, which can greatly reduce the pressure loss of the regulating valve and reduce the pipeline vibration and flow noise caused by the regulating valve.

[0003] However, the streamlined design of the tail fairing requires high machining precision to achieve accurate flow control, and the fit with the valve body also requires high machining precision to achieve valve closure. At the same time, the setting of sliding friction plates, lead screw nuts, and bevel gears also requires high machining precision and has a complex structure, which increases the difficulty of valve machining and results in low valve production efficiency. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention provides an axial flow piston flow regulating valve, which mainly solves the problem that the axial flow flow regulating valve has a complex structure and is difficult to process, resulting in low production efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An axial flow piston flow regulating valve includes a valve body, a valve stem, a crank, a connecting rod, a connecting seat, a piston cylinder, a permeable cylinder, at least two guide rails, a fixing ring, a first sealing ring, a second sealing ring, and a flow guide. The valve body includes an outer valve body and an inner valve body. The outer valve body has an inlet, an outlet, and an inner cavity communicating with the inlet and outlet. The inner valve body is located in the middle of the inner cavity, forming a flow channel connecting the outlet and the inlet. An opening is provided at one end of the inner valve body near the outlet. The valve stem is rotatably mounted on the valve body, with one end located on the outside of the outer valve body and the other end located inside the inner valve body and connected to the crank. One end of the connecting rod is hinged to the crank. The connecting seat includes an integrally formed connecting ring and a connecting part. The connecting part is located inside the connecting ring and extends axially towards the outlet. The valve has a lateral protrusion. The connecting part is hinged to the other end of the connecting rod via a pin. The piston cylinder and the permeable cylinder are both fixedly connected to the connecting ring and are coaxially arranged. The first sealing ring is located at the opening of the inner valve body. Each of the guide rails is located on the inner surface of the inner valve body and is distributed along the axial direction of the connecting ring. The piston cylinder is located on one side of the inner valve body and slides along the guiding direction of the guide rails. The permeable cylinder is located on one side of the outlet. Several permeable grooves are distributed at intervals around the permeable cylinder, and each permeable groove is distributed along the axial direction of the permeable cylinder. The second sealing ring is located at the outlet of the outer valve body via a fixing ring. One end of the flow guide is located on the connecting seat and is distributed inside the permeable cylinder. When the valve is closed, the permeable cylinder is located on the outside of the outer valve body, and the piston cylinder blocks the flow channel and the outlet. When the valve is open, the permeable groove connects the flow channel and the outlet.

[0007] Furthermore, the flow guide includes a support rod with one end fixed to the connecting part and coaxially distributed with the connecting ring, and a first flow guide ring and a second flow guide ring sleeved on the support rod, wherein the first flow guide ring and the second flow guide ring are integrally formed.

[0008] Furthermore, both the first and second guide rings have curved surface structures. The radius of curvature of the first guide ring is greater than that of the second guide ring. The center of the first guide ring is located at the connection between the connecting part and the support rod.

[0009] Furthermore, a rectifier assembly for maintaining the stability of fluid medium flow is rotatably provided on the support rod and located at the output end of the second guide ring.

[0010] Furthermore, the rectifier assembly includes a base ring sleeved on the support rod, a plurality of rotating shafts arranged around one axial end of the base ring, a first swing rod arranged at one axial end of the rotating shaft, a second swing rod connected to the other end of the first swing rod, swirl blades arranged on the free end of the second swing rod, and a torsion spring sleeved on the rotating shaft, wherein the two ends of the torsion spring are respectively connected to the base ring and the other axial end of the rotating shaft.

[0011] Furthermore, the swirl blade includes a first part and a second part with a curved surface structure. The first part and the second part are integrally formed. The first part is connected to the second swing arm. The orthographic projection area of ​​the first part is larger than that of the second part. The concave surface of the first part faces outward, and the concave surface of the second part faces the base ring.

[0012] Furthermore, the outer valve body is provided with at least one external connection port communicating with the flow channel, and each external connection port is covered with an outer end cap.

[0013] Furthermore, the end face of the inner valve body that is furthest from the opening is provided as a hemispherical surface.

[0014] Furthermore, an inner connection port is provided in the middle of the end face of the inner valve body that is away from the opening, and an inner end cap is provided on the inner connection port.

[0015] Furthermore, the outer end of the valve stem is connected to the rotary wheel via a worm gear assembly.

[0016] By adopting the aforementioned technical solution, the beneficial effects of this invention are as follows: In this axial flow piston flow regulating valve, the valve stem is connected to the connecting seat via a crank and connecting rod, and a piston cylinder and a permeable cylinder are installed on the connecting seat. By rotating the valve stem, the piston cylinder is driven to move along the guide direction of the guide rail, thereby driving the permeable cylinder to move. When the valve is closed, the permeable cylinder is distributed on the outside of the outer valve body, and the piston cylinder blocks the flow channel and the outlet. When the valve is open, the permeable groove connects the flow channel and the outlet, realizing the opening and closing of the valve. This type of axial flow regulating valve moves the permeable cylinder along its axial direction through a crank-connecting rod mechanism. A first sealing ring is set at the opening of the inner valve body, and a second sealing ring is set at the outlet of the outer valve body, which cooperates with the piston cylinder and the permeable cylinder to achieve the functions of sealing and guiding. At the same time, the guide rail provides support and guidance for the piston cylinder, allowing the piston cylinder and the permeable cylinder to move together. The water cylinder exhibits good operational stability and strong sealing. Its simple structure and low processing difficulty result in high production efficiency. Furthermore, the permeable grooves on the water cylinder—specifically, the first and second permeable grooves, which are staggered and have a larger axial length than the second—are aligned with the outlet ends of both grooves. This, along with the connecting ring and connection part on the crank-connecting rod mechanism and connecting seat, ensures a constant ratio between the speed at which the valve stem rotates and the flow rate through the permeable cylinder. This allows for precise adjustment of the fluid medium's profile, improving ease of use. Additionally, the fluid medium injected through the permeable grooves flushes the guide components, which in turn guide the flow, reducing noise and vibration caused by water flow impact, eliminating air bubbles, and ensuring the stability of the fluid medium's flow. Attached Figure Description

[0017] Figure 1 This is a front view structural diagram of an embodiment of the present invention;

[0018] Figure 2 This is a partial cross-sectional view of the valve in the closed state in an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional structural diagram of an embodiment of the present invention;

[0020] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0021] Figure 5 This is a cross-sectional view of the rectifier assembly in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the left-side structure of the rectifier assembly in an embodiment of the present invention;

[0023] Figure 7 This is a partial cross-sectional view of the valve opening pile body in an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the right-side structure according to an embodiment of the present invention. Detailed Implementation

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0026] The embodiments of the present invention are as follows:

[0027] refer to Figures 1 to 8As shown, an axial flow piston flow regulating valve includes a valve body, a valve stem 3, a crank 4, a connecting rod 5, a connecting seat 6, a piston cylinder 7, a water-permeable cylinder 8, four guide rails 9, a fixing ring 10, a first sealing ring 11, a second sealing ring 12, and a flow guide 13. The valve body includes an outer valve body 1 and an inner valve body 2. The outer valve body 1 is provided with an inlet 101, an outlet 102, and an inner cavity communicating with the inlet 101 and the outlet 102. The inner valve body 2 is located in the middle of the inner cavity, so that a flow channel 103 connecting the outlet 101 and the inlet 102 is formed in the inner cavity. The inner valve body 2 is located near the outlet 101. One end of valve 02 has an opening 104. Valve stem 3 is rotatably mounted on valve body. One end of valve stem 3 is located on the outside of outer valve body 1, and the other end is located inside inner valve body 2 and connected to crank 4. One end of connecting rod 5 is hinged to crank 4. Connecting seat 6 includes an integrally formed connecting ring 61 and connecting part 62. Connecting part 62 is located inside connecting ring 61 and protrudes towards one side of outlet 102 along the axial direction of connecting ring 61. Connecting part 62 is hinged to the other end of connecting rod 5 via pin 63. Piston cylinder 7 and permeable cylinder 8 are both connected to connecting ring 61. The piston cylinder 7 and the permeable cylinder 8 are fixedly connected and coaxially arranged. The first sealing ring 11 is located at the opening 104 of the inner valve body 2. Each of the guide rails 9 is located on the inner surface of the inner valve body 2 and is distributed along the axial direction of the connecting ring 61. The piston cylinder 7 is located on one side of the inner valve body 2 and slides along the guiding direction of the guide rail 9. The permeable cylinder 8 is located on one side of the outlet 102. Several permeable grooves are distributed at intervals around the permeable cylinder 8. Each permeable groove is distributed along the axial direction of the permeable cylinder 8. The permeable groove includes a first permeable groove 14 and a second permeable groove 15. The first permeable groove 14 and the second permeable groove 15 are... The permeable channels 15 are staggered. The axial length of the first permeable channel 14 is greater than that of the second permeable channel 15. The ends of the first permeable channel 14 and the second permeable channel 15 near the outlet 102 are aligned. The second sealing ring 12 is provided at the outlet 102 of the outer valve body 1 through the fixing ring 10. One end of the guide member 13 is provided on the connecting seat 6 and distributed inside the permeable cylinder 8. When the valve is closed, the permeable cylinder 8 is distributed on the outside of the outer valve body 1, and the piston cylinder 7 blocks the flow channel 103 and the outlet 102. When the valve is open, the permeable channels connect the flow channel 103 and the outlet 102.

[0028] This axial flow piston flow regulating valve has a valve stem 3 connected to a connecting seat 6 via a crank 4 and a connecting rod 5. A piston cylinder 7 and a permeable cylinder 8 are mounted on the connecting seat 6. Rotating the valve stem 3 causes the piston cylinder 7 to move along the guide rail 9, which in turn moves the permeable cylinder 8. When the valve is closed, the permeable cylinder 8 is positioned on the outside of the outer valve body 1, and the piston cylinder 7 blocks the flow channel 103 and the outlet 102. When the valve is open, the permeable trough connects the flow channel 103 and the outlet 102, thus opening and closing the valve. This type of axial flow regulating valve uses a crank-connecting rod mechanism to move the permeable cylinder 8 along its axial direction. A first sealing ring 11 is installed at the opening 104 of the inner valve body 2, and a second sealing ring 12 is installed at the outlet 102 of the outer valve body 1. These seals cooperate with the piston cylinder 7 and the permeable cylinder 8 to achieve sealing and guiding functions. The guide rail 9 also supports and guides the piston cylinder 7, allowing the piston cylinder 7 and the permeable cylinder 8 to move smoothly. With good operational stability and strong sealing, the structure is simple and easy to manufacture, resulting in high production efficiency. Furthermore, the permeable grooves on the permeable cylinder 8, namely, the first permeable groove 14 and the second permeable groove 15, are staggered. The axial length of the first permeable groove 14 is greater than that of the second permeable groove 15. The ends of the first and second permeable grooves 14 and 15 near the outlet 102 are aligned with the crank connecting rod mechanism and the connecting ring 61 and connecting part 62 on the connecting seat 6. This ensures that the ratio of the speed at which the valve stem 3 rotates and drives the permeable cylinder 8 to move is constant with the flow rate flowing through the permeable cylinder 8, thus regulating the fluid medium's profile and improving ease of use. In addition, the fluid medium injected into the permeable grooves washes the guide members, which, through the guide members 13, act as guides, reducing noise and vibration caused by water flow impact, eliminating air bubbles, and ensuring the flow stability of the fluid medium.

[0029] Specifically, the flow guide 13 includes a support rod 131 with one end fixed to the connecting part 62 and coaxially distributed with the connecting ring 61, and a first flow guide ring 132 and a second flow guide ring 133 sleeved on the support rod 131. The first flow guide ring 132 and the second flow guide ring 133 are integrally formed. Both the first flow guide ring 132 and the second flow guide ring 133 have curved surface structures. The radius of curvature of the first flow guide ring 132 is larger than the radius of curvature of the second flow guide ring 133. The center of the first flow guide ring 132 is distributed at the connection between the connecting part 62 and the support rod 131. The arrangement of the first flow guide ring 132 and the second flow guide ring 133 matches the flow rate of the fluid medium injected by the permeable tank during the axial movement of the permeable cylinder 8, which can achieve a good flow guiding effect and avoid hindering the large flow of the fluid medium when the valve body is fully open. While guiding the flow, it also improves the flow efficiency of the fluid medium.

[0030] Furthermore, a rectifier assembly 20 for maintaining the flow stability of the fluid medium is rotatably provided on the support rod 131 and located at the output end of the second guide ring 133. The rectifier assembly 20 includes a base ring 201 sleeved on the support rod 131, a plurality of rotating shafts 202 surrounding one axial end of the base ring 201, a first rocker arm 203 located at one axial end of the rotating shafts 202, a second rocker arm 204 connected to the other end of the first rocker arm 203, swirl vanes 205 located at the free end of the second rocker arm 204, and a rectifier assembly 205 sleeved on the rotating shafts. The torsion spring 206 on 202 has its two ends connected to the base ring 201 and the other axial end of the rotating shaft 202, respectively. The swirl blade 205 includes a first part 215 and a second part 225 with a curved surface structure. The first part 215 and the second part 225 are integrally formed. The first part 215 is connected to the second swing arm 204. The orthographic projection area of ​​the first part 215 is larger than that of the second part 225. The concave surface of the first part 215 faces outward, and the concave surface of the second part 225 faces the base ring.

[0031] After being guided by the flow guide 13, the fluid medium impacts the swirl vane 205, thereby causing the swirl vane 205 and the base ring 201 to rotate along the support rod 131. When the impact force of the fluid medium is large, the force acting on the swirl vane 205 is also large, causing the first swing rod 203 and the second swing rod 204 to drive the rotating shaft 202 to rotate against the elastic force of the torsion spring 206. This increases the opening of the swirl vane 205 on the rectifier assembly 20, increasing the flow area through the rectifier assembly 20. Therefore, by adjusting the opening of the swirl vane 205 on the rectifier assembly 20 using the elastic force of the torsion spring 206, control can be achieved. The swirl vanes 205 work together to create a swirling effect in the fluid medium, maintaining stable flow and removing air bubbles trapped within the fluid medium. This improves the accuracy of flow control and keeps the fluid medium stable. Specifically, part of the fluid medium impacting the swirl vanes 205 acts on the first part 215, causing the swirl vanes 205 and the base ring 201 to rotate, and the first part 215 guides the inner flow. The other part of the fluid medium impacts the second part 225 and is guided by the second part 225, achieving a counter-clamping effect and creating a turbulent flow effect in the fluid medium.

[0032] Furthermore, the outer valve body 1 is provided with four external connection ports 16 communicating with the flow channel, and each of the external connection ports 16 is covered with an outer end cap 17. The inner valve body 2 is provided with an inner connection port 18 in the middle of the end face away from the opening 104, and the inner connection port 18 is covered with an inner end cap 19, which facilitates flow diversion, valve pressure adjustment and valve maintenance, and improves the convenience of use. In addition, the end face of the inner valve body 2 away from the opening 104 is set as a hemispherical surface, which plays a guiding role and improves the fluidity of the fluid medium. The outer end of the valve stem 3 is connected to the rotor 22 through the worm gear assembly 21, which facilitates valve adjustment and reduces the space occupied by the valve, improving the convenience of use.

[0033] In this embodiment, the second sealing ring 12 includes a main body 121 with an annular structure and an extension 122 extending from the inner side of the main body 121 toward the center. The width of the extension 122 is smaller than the width of the main body 121, and the width of the extension 122 gradually decreases from the main body 121 toward the center.

[0034] An elastic washer 30 is provided between the permeable cylinder 8 and the connecting ring 61. The diameter of the permeable cylinder 8 is smaller than the diameter of the piston cylinder 7. A first inclined surface 23 is provided at the end of the piston cylinder 7 that is connected to the permeable cylinder 8. A second inclined surface 24 that cooperates with the first inclined surface 23 is provided at the inner end of the fixing ring 10. The inner diameter of the fixing ring 10 is 2-4 mm larger than the outer diameter of the permeable cylinder 8, preferably 3 mm. The free end of the extension 122 abuts against the outer surface of the permeable cylinder 8.

[0035] Through the above-mentioned configuration, the permeable cylinder 8 is flexibly connected to the fixed ring 10 and the connecting ring 61. When the fluid medium flows through the permeable tank, the central axis of the permeable cylinder 8 shifts due to the difference in the flow rate of the fluid medium passing through each permeable tank. This shift is corrected by the action of the second sealing ring 12 and the elastic washer 30. This repeated action causes slight vibration of the permeable cylinder 8, which can prevent impurities in the fluid medium from clogging the permeable tank, ensure the permeability of the fluid medium, and improve the durability of the product. Furthermore, when the valve is closed, the first inclined surface 23 of the piston cylinder cooperates with the second inclined surface 24 on the fixed ring to clamp the extension 122, ensuring good sealing when the valve is closed and guaranteeing the quality of the product.

[0036] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A positive displacement flow regulating valve of the axial flow type characterised in that: The device includes a valve body, valve stem, crank, connecting rod, connecting seat, piston cylinder, permeable cylinder, at least two guide rails, fixing ring, first sealing ring, second sealing ring, and flow guide. The valve body includes an outer valve body and an inner valve body. The outer valve body has an inlet, an outlet, and an inner cavity communicating with the inlet and outlet. The inner valve body is located in the middle of the inner cavity, forming a flow channel connecting the outlet and inlet. The inner valve body has an opening near the outlet. The valve stem is rotatably mounted on the valve body, with one end located on the outside of the outer valve body and the other end located inside the inner valve body and connected to the crank. One end of the connecting rod is hinged to the crank. The connecting seat includes an integrally formed connecting ring and a connecting part. The connecting part is located inside the connecting ring and protrudes towards the outlet side along the axial direction of the connecting ring. The connecting part is hinged to the other end of the connecting rod via a pin. The piston cylinder and the permeable cylinder are both fixedly connected to the connecting ring, and the piston cylinder and the permeable cylinder are coaxially arranged. The first sealing ring is located at the opening of the inner valve body. Each of the guide rails is located on the inner surface of the inner valve body and is distributed along the axial direction of the connecting ring. The piston cylinder is located on one side of the inner valve body and slides along the guiding direction of the guide rail. The permeable cylinder is located on one side of the outlet. Several permeable grooves are distributed at intervals around the permeable cylinder, and each permeable groove is distributed along the axial direction of the permeable cylinder. The second sealing ring is located at the outlet of the outer valve body via a fixing ring. One end of the flow guide is located on the connecting seat and is distributed inside the permeable cylinder. When the valve is closed, the permeable cylinder is located on the outside of the outer valve body, and the piston cylinder blocks the flow channel and the outlet. When the valve is open, the permeable groove connects the flow channel and the outlet. The flow guide includes a support rod fixed at one end to the connecting part and coaxially distributed with the connecting ring, and a first flow guide ring and a second flow guide ring sleeved on the support rod. A flow rectifying assembly for maintaining the flow stability of the fluid medium is rotatably provided on the support rod and located at the output end of the second flow guide ring. The flow rectifying assembly includes a base ring sleeved on the support rod, a plurality of rotating shafts arranged around one axial end of the base ring, a first swing rod at one axial end of the rotating shaft, a second swing rod connected to the other end of the first swing rod, a swirl blade on the free end of the second swing rod, and a torsion spring sleeved on the rotating shaft. The two ends of the torsion spring are respectively connected to the other axial end of the base ring and the rotating shaft.

2. The axial piston flow regulating valve according to claim 1, characterized in that: The first guide ring and the second guide ring are integrated into one piece.

3. The axial piston flow regulating valve according to claim 2, characterized in that: Both the first and second guide rings have curved surface structures. The radius of curvature of the first guide ring is greater than that of the second guide ring. The center of the first guide ring is located at the connection between the connecting part and the support rod.

4. The axial piston flow regulating valve according to claim 3, characterized in that: The swirl blade includes a first part and a second part with a curved surface structure. The first part and the second part are integrally formed. The first part is connected to the second swing arm. The orthographic projection area of ​​the first part is larger than that of the second part. The concave surface of the first part faces outward, and the concave surface of the second part faces the base ring.

5. The axial piston flow regulating valve according to any one of claims 1 to 4, characterized in that: The outer valve body is provided with at least one external connection port that communicates with the flow channel, and each external connection port is covered with an outer end cap.

6. The axial piston flow regulating valve according to any one of claims 1 to 4, characterized in that: The inner valve body is provided with a semispherical surface at one end away from the opening.

7. The axial piston flow regulating valve according to any one of claims 1 to 4, characterized in that: The inner valve body is provided with an inner connecting port in the middle of the end surface away from the opening, and an inner end cover is arranged on the inner connecting port.

8. The axial piston flow regulating valve according to any one of claims 1 to 4, characterized in that: The outer end of the valve rod is connected with the rotating wheel through a worm and gear assembly.

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