Axial flow regulating valve

Abstract

The utility model belongs to the technical field of governing valve discloses a kind of axial flow governing valve, valve body is through and is opened medium cavity, the outer wall of valve seat is sealed in the cavity wall of medium cavity, medium cavity is fixed and is installed seat, the end of installation seat close to valve seat is opened sliding cavity, valve core is slidably installed in sliding cavity, valve core is along its axial direction and is opened guide hole, the end of guide hole close to valve seat is fixed and is set plug, one end of push rod is inserted in guide hole and is abutted to plug, static seal ring is clamped in push rod and guide hole, valve rod is movably arranged in installation seat, valve rod is along its axial direction and reciprocating motion, drive push rod push valve core along its axial direction and reciprocating motion, to seal or separate from valve seat;The utility model is through being set between valve core and push rod for relative static seal structure, reduce the quantity of dynamic seal, save internal space, use conventional inexpensive material to make valve core and push rod, under the premise of internal space is saved, can continue to improve strength by increasing the diameter of valve core and push rod, reduce manufacturing cost.

Description

Technical Field

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

[0002] Control valves are terminal control elements in industrial process control systems, typically used to regulate the flow parameters of fluid media. They automatically change the valve opening based on the signal output by the controller, thereby regulating the flow parameters of the fluid media in the process. Axial flow control valves are a common type of control valve.

[0003] Currently, axial flow control valves on the market typically operate by having a valve stem drive a push rod, which in turn drives the valve core. In this configuration, the valve core and push rod form a dynamic seal, which occupies a significant amount of space. In small-diameter, high-pressure control valves, due to their compact internal structure and the presence of a dynamic seal between the valve core and push rod, it is impossible to increase the mechanical strength of the valve stem and push rod by increasing their diameter. Therefore, it is often necessary to use higher-performance, but more expensive, materials for the valve stem and push rod, resulting in higher costs. Utility Model Content

[0004] The purpose of this invention is to provide an axial flow regulating valve that can ensure the mechanical strength of the valve's internal components while also saving on manufacturing costs.

[0005] To achieve this objective, the present invention adopts the following technical solution: An axial flow regulating valve includes a valve body, a valve seat, a valve core, a valve stem, a push rod, and a static sealing ring. The valve body has a media chamber extending through it. The outer wall of the valve seat is circumferentially sealed to the wall of the media chamber. A mounting seat is fixedly installed in the media chamber. A sliding cavity is formed at one end of the mounting seat near the valve seat. The valve core is slidably installed in the sliding cavity and is coaxial with the valve seat. A guide hole is formed through the valve core along its axial direction. A plug is fixed at one end of the guide hole near the valve seat. The push rod is coaxial with the valve core. One end of the push rod is inserted into the guide hole and abuts against the plug. The static sealing ring is sandwiched between the outer wall of the push rod and the wall of the guide hole. The valve stem is movably disposed inside the mounting seat and is drivenly connected to the other end of the push rod. The valve stem reciprocates along its axial direction, driving the push rod to push the valve core to reciprocate along its axial direction in the sliding cavity, thereby sealing or disengaging from the valve seat.

[0006] Preferably, a first sealing groove is formed circumferentially on the wall of the guide hole, and the static sealing ring is embedded in the first sealing groove.

[0007] Preferably, a second sealing groove is formed circumferentially in the wall of the sliding cavity, and a dynamic sealing ring is embedded in the second sealing groove. The dynamic sealing ring is sandwiched between the outer wall of the valve core and the wall of the sliding cavity.

[0008] Preferably, the valve core has a stroke cavity along its axial direction, the stroke cavity is connected to the guide hole, and the other end of the valve stem and the other end of the push rod both extend into the stroke cavity.

[0009] Preferably, the axial direction of the valve stem intersects the axial direction of the valve core, the other end of the push rod is provided with a first helical tooth section along its axial direction, and the valve stem is provided with a second helical tooth section along its axial direction, the first helical tooth section and the second helical tooth section meshing and slidingly engaging.

[0010] Preferably, the axial flow regulating valve further includes an actuator mounted on the valve body, one end of the valve stem passing through the mounting base and the valve body and connected to the actuator, the actuator being configured to drive the valve stem to reciprocate along its axial direction.

[0011] Preferably, the guide hole has an internal thread on its wall near the valve seat, and the plug has an external thread on its outer wall, and the plug is screwed onto the wall of the guide hole.

[0012] Preferably, the plug includes a threaded portion and an abutment portion, the size of the threaded portion being smaller than the size of the abutment portion, the external thread being provided on the threaded portion, and the end face of the abutment portion circumferentially abutting against the end face of the valve core.

[0013] Preferably, the sliding cavity is arranged along the axial direction of the valve seat.

[0014] The beneficial effects of this utility model are: This invention provides an axial flow regulating valve. The valve body has a through-hole for a medium chamber. The outer wall of the valve seat is circumferentially sealed to the wall of the medium chamber. A mounting seat is fixed to the medium chamber. A sliding chamber is formed at one end of the mounting seat near the valve seat. The valve core is slidably mounted in the sliding chamber and is coaxial with the valve seat. A guide hole is formed through the valve core along its axial direction. A plug is fixed at one end of the guide hole near the valve seat. A push rod is coaxial with the valve core. One end of the push rod is inserted into the guide hole and abuts against the plug. A static sealing ring is sandwiched between the outer wall of the push rod and the wall of the guide hole. The valve stem is movably disposed inside the mounting seat and is driven to the other end of the push rod. The valve stem reciprocates along its axial direction, driving the push rod to push the valve core to reciprocate along its axial direction in the sliding chamber, thereby sealing or disengaging from the valve seat. This invention reduces the number of dynamic seals and saves internal space by setting a relatively static sealing structure between the valve core and the push rod. It allows the valve core and push rod to be made using conventional and inexpensive materials. While saving internal space, the mechanical strength is increased by increasing the diameter of the valve core and push rod, thereby reducing manufacturing costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an axial flow regulating valve provided in an embodiment of this utility model; Figure 2 This is an assembly diagram of the valve stem, push rod, valve core, static sealing ring and plug provided in an embodiment of this utility model; Figure 3 This is a cross-sectional schematic diagram of the valve core provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the push rod provided in an embodiment of the present invention.

[0016] In the picture: 1. Valve body; 11. Medium chamber; 12. Perforation; 2. Valve seat; 3. Valve core; 31. Guide hole; 32. First sealing groove; 33. Stroke cavity; 4. Valve stem; 41. Second helical tooth section; 5. Push rod; 51. First helical tooth section; 6. Static sealing ring; 7. Mounting seat; 71. Sliding cavity; 72. Insertion hole; 73. Positioning hole; 8. Plug; 9. Dynamic sealing ring; a. Actuator. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0018] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0021] It should be noted that axial flow control valves currently on the market typically operate using a valve stem driving a push rod, which in turn drives the valve core. In this configuration, the valve core and push rod form a dynamic seal. To ensure that the seal between the valve core and push rod is not squeezed out or twisted during their relative sliding, a longer guide section is required, increasing the axial length and occupying more space. In small-diameter, high-pressure control valves, due to their compact internal structure and the dynamic seal between the valve core and push rod, it is not possible to increase the mechanical strength of the valve stem and push rod by increasing their diameter. Therefore, it is often necessary to use higher-performance but more expensive materials to manufacture the valve stem and push rod, resulting in higher costs.

[0022] Therefore, this embodiment provides an axial flow regulating valve that designs a relatively static sealing structure between the valve core and the push rod, reducing the number of dynamic seals and thus saving internal space. With the internal space saved, the valve core and push rod can be made using conventional and inexpensive materials. By increasing the diameter of the valve core and push rod, the mechanical strength is improved, thereby reducing the manufacturing cost.

[0023] Please see Figures 1 to 4 This embodiment provides an axial flow regulating valve including a valve body 1, a valve seat 2, a valve core 3, a valve stem 4, and a push rod 5. The valve seat 2 is installed on the valve body 1, the valve core 3 is slidably disposed inside the valve body 1, and the valve stem 4 is movably disposed inside the valve body 1. The push rod 5 cooperates with the valve core 3 to form a relatively static seal, thereby treating the valve core 3 and the push rod 5 as a single unit. The valve stem 4 reciprocates along its axial direction, driving the push rod 5 to push the valve core 3 to reciprocate along its axial direction. The valve core 3 approaches the valve seat 2, so that the valve core 3 and the valve seat 2 are sealed together, closing the valve; or, the valve core 3 moves away from the valve seat 2, so that the valve core 3 disengages from the valve seat 2, opening the valve.

[0024] In this embodiment, the valve seat 2, valve core 3 and push rod 5 are set to be coaxial to ensure that the push rod 5 can push the valve core 3 to reciprocate along its axial direction. On this basis, it is ensured that the valve core 3 can smoothly form a sealing fit with the valve seat 2.

[0025] Specifically, please refer to Figure 1 The valve body 1 extends through the medium cavity 11, and the valve seat 2 is installed at one end of the medium cavity 11, with the outer wall of the valve seat 2 circumferentially sealed to the cavity wall of the medium cavity 11.

[0026] Further, please refer to Figure 1 A mounting base 7 is fixed in the medium cavity 11, and the mounting base 7 and the cavity wall of the medium cavity 11 cooperate to form an annular gap. The annular gap connects the two ends of the medium cavity 11 to avoid affecting the medium conveying of the medium cavity 11.

[0027] Furthermore, the medium cavity 11 has a structure that is larger in the middle and smaller at both ends along its opening direction. Therefore, when the valve core 3 moves away from the valve seat 2, the flow surface formed by the outer wall surface of the valve core 3 and the medium cavity 11 expands, and the valve opening increases. When the valve core 3 moves closer to the valve seat 2, the flow surface formed by the outer wall surface of the valve core 3 and the medium cavity 11 shrinks, and the valve opening decreases.

[0028] Please see Figures 1 to 3 In this embodiment, the mounting base 7 has a sliding cavity 71 at one end near the valve seat 2. The valve core 3 is slidably installed in the sliding cavity 71. Further, the valve core 3 has a guide hole 31 extending through it along its axial direction, and a plug 8 is fixed at one end of the guide hole 31 near the valve seat 2. One end of the push rod 5 is inserted into the guide hole 31 and abuts against the plug 8. A static sealing ring 6 is sandwiched between the outer wall of the push rod 5 and the hole wall of the guide hole 31. When the medium cavity 11 is filled with medium pressure, the push rod 5 is pressed by the plug 8. The clearance between the push rod 5 and the valve core 3 is compensated by the static sealing ring 6. The valve core 3 and the push rod 5 form a static sealing structure. The valve core 3 and the push rod 5 can be regarded as a whole, so only the dynamic sealing structure of the valve core 3 needs to be considered to meet the effective sealing of the valve.

[0029] Optionally, the sliding cavity 71 is arranged along the axial direction of the valve seat 2, and since the valve seat 2 and the valve core 3 are coaxial, the valve core 3 can not only seal with the valve seat 2 through its reciprocating motion along its axial direction, but also form a dynamic sealing structure with the sliding cavity 71.

[0030] Please see Figure 2 and Figure 3 In this embodiment, a first sealing groove 32 is formed in the circumferential direction of the guide hole 31, and a static sealing ring 6 is embedded in the first sealing groove 32. By pre-compression or external pressure, the static sealing ring 6 is elastically deformed to fill the fitting gap between the push rod 5 and the valve core 3, thereby forming a static sealing structure between the push rod 5 and the valve core 3.

[0031] This embodiment provides a method for forming a dynamic sealing structure by the valve core 3 and the sliding cavity 71. For example, a second sealing groove is formed circumferentially on the cavity wall of the sliding cavity 71, and a dynamic sealing ring 9 is embedded in the second sealing groove. Please refer to [link to relevant documentation]. Figure 1 The dynamic sealing ring 9 is sandwiched between the outer wall of the valve core 3 and the cavity wall of the sliding cavity 71 to ensure that the valve core 3 forms a dynamic sealing structure with the sliding cavity 71 while it reciprocates along its axial direction, thus ensuring the effective sealing of the valve.

[0032] In this embodiment, an internal thread is provided on the wall of the guide hole 31 near the valve seat 2, and a matching external thread is provided on the outer wall of the plug 8. This allows the plug 8 to be screwed onto the wall of the guide hole 31, providing both a certain connection strength and ease of replacement. Preferably, the plug 8 includes a threaded portion and an abutment portion. The size of the threaded portion is smaller than the size of the abutment portion, and the threaded portion and the abutment portion are coaxial cylindrical structures. The external thread is provided on the outer wall of the threaded portion. The plug 8 is screwed until the threaded portion is screwed onto the wall of the guide hole 31, and the end face of the abutment portion circumferentially abuts against the end face of the valve core 3.

[0033] Furthermore, the valve stem 4 is movably disposed inside the mounting base 7, and the valve stem 4 is driven to the other end of the push rod 5. The valve stem 4 reciprocates along its axial direction, thereby driving the push rod 5 to push the valve core 3 to reciprocate along its axial direction. The valve core 3 approaches the valve seat 2, so that the valve core 3 and the valve seat 2 are sealed together to close the valve, or the valve core 3 moves away from the valve seat 2, so that the valve core 3 is disengaged from the valve seat 2 and the valve is opened.

[0034] Please see Figure 1 The regulating valve provided in this embodiment also includes an actuator a, which is installed on the valve body 1. One end of the valve stem 4 extends out of the mounting seat 7 and is connected to the valve body 1 and the actuator a. The actuator a is configured to drive the valve stem 4 to reciprocate along its axial direction.

[0035] Further, please refer to Figure 2 and Figure 3 The valve core 3 has a stroke cavity 33, which connects to the guide hole 31. The other end of the valve stem 4 and the other end of the push rod 5 both extend into the stroke cavity 33, and the other end of the valve stem 4 and the other end of the push rod 5 slide within the stroke cavity 33. Furthermore, in this embodiment, the stroke cavity 33 is set along the axial direction of the valve core 3. When the actuator a drives the valve stem 4 to reciprocate along its axial direction, thereby causing the push rod 5 to push the valve core 3 to reciprocate along its axial direction, the valve stem 4 and the valve core 3 generate relative displacement along the axial direction of the valve core 3. By setting the stroke cavity 33 to be set along the axial direction of the valve core 3, the position of the valve stem 4 within the stroke cavity 33 can change during this process.

[0036] Preferably, please refer to Figure 1 The stroke cavity 33 extends to one side of the outer wall of the valve core 3. A through hole 12 is opened on the top of the valve body 1 along the axial direction of the valve stem 4. An insertion hole 72 communicating with the sliding cavity 71 is opened on the mounting base 7 along the axial direction of the valve stem 4. The insertion hole 72 is connected and directly opposite the through hole 12, and the insertion hole 72 is always connected with the stroke cavity 33. The other end of the valve stem 4 extends into the stroke cavity 33. One end of the valve stem 4 is sequentially inserted into the insertion hole 72 and the through hole 12 and connected to the actuator a.

[0037] For other feasible embodiments, please refer to Figure 1 The stroke cavity 33 passes through the valve core 3, and a positioning hole 73 communicating with the sliding cavity 71 is opened on the mounting base 7 along the axial direction of the valve stem 4. The positioning hole 73 is opposite to and coaxial with the insertion hole 72, and the positioning hole 73 is always communicating with the stroke cavity 33. The other end of the valve stem 4 extends into the stroke cavity 33 and then further into the positioning hole 73. During the reciprocating motion of the valve stem 4 along its axial direction, the other end of the valve stem 4 is always confined in the positioning hole 73 to improve the accuracy of the movement of the valve stem 4.

[0038] In this embodiment, the axial direction of the valve stem 4 intersects with the axial direction of the valve core 3. Please refer to [link / reference]. Figure 2 The other end of the push rod 5 is provided with a first helical tooth section 51 along its axial direction, and the valve stem 4 is provided with a second helical tooth section 41 along its axial direction. The first helical tooth section 51 and the second helical tooth section 41 mesh and slide together. The actuator a drives the valve stem 4 to reciprocate along its axial direction. Through the sliding engagement between the second helical tooth section 41 and the first helical tooth section 51, the push rod 5 can be driven to reciprocate along its axial direction, thereby driving the valve core 3 to reciprocate along its axial direction.

[0039] In this embodiment, the axial direction of the valve stem 4 is perpendicular to the axial direction of the valve core 3, and the teeth of the first helical tooth segment 51 and the second helical tooth segment 41 are both inclined at 45°. In other feasible embodiments, the intersection angle between the axial direction of the valve stem 4 and the axial direction of the valve core 3 can be set to other values, and the inclination angles of the teeth of the first helical tooth segment 51 and the second helical tooth segment 41 can be configured accordingly, so that the two mesh and slide together.

[0040] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An axial flow regulating valve, characterized in that, The valve body (1) includes a valve seat (2), a valve core (3), a valve stem (4), a push rod (5), and a static sealing ring (6). The valve body (1) extends through a medium cavity (11). The outer wall of the valve seat (2) is circumferentially sealed to the cavity wall of the medium cavity (11). A mounting seat (7) is fixedly installed in the medium cavity (11). A sliding cavity (71) is opened at one end of the mounting seat (7) near the valve seat (2). The valve core (3) is slidably installed in the sliding cavity (71) and is coaxial with the valve seat (2). A guide hole (31) extends through the valve core (3) along its axial direction. The guide hole (31) is close to one end of the valve seat (2). A plug (8) is fixed at one end. The push rod (5) is coaxial with the valve core (3). One end of the push rod (5) is inserted into the guide hole (31) and abuts against the plug (8). The static sealing ring (6) is sandwiched between the outer wall of the push rod (5) and the hole wall of the guide hole (31). The valve stem (4) is movably disposed inside the mounting base (7), and the valve stem (4) is driven to be connected to the other end of the push rod (5). The valve stem (4) reciprocates along its axial direction, driving the push rod (5) to push the valve core (3) to reciprocate along its axial direction in the sliding cavity (71) to seal or disengage from the valve seat (2).

2. The axial flow regulating valve according to claim 1, characterized in that, The guide hole (31) has a first sealing groove (32) circumferentially formed on its wall, and the static sealing ring (6) is embedded in the first sealing groove (32).

3. The axial flow regulating valve according to claim 1, characterized in that, The sliding cavity (71) has a second sealing groove circumferentially formed in the cavity wall, and a dynamic sealing ring (9) is embedded in the second sealing groove. The dynamic sealing ring (9) is sandwiched between the outer wall of the valve core (3) and the cavity wall of the sliding cavity (71).

4. The axial flow regulating valve according to claim 1, characterized in that, The valve core (3) has a stroke cavity (33) along its axial direction, the stroke cavity (33) is connected to the guide hole (31), and the other end of the valve stem (4) and the other end of the push rod (5) both extend into the stroke cavity (33).

5. An axial flow regulating valve according to claim 1, characterized in that, The axial direction of the valve stem (4) intersects the axial direction of the valve core (3). The other end of the push rod (5) is provided with a first helical tooth section (51) along its axial direction. The valve stem (4) is provided with a second helical tooth section (41) along its axial direction. The first helical tooth section (51) and the second helical tooth section (41) mesh and slide together.

6. An axial flow regulating valve according to claim 1, characterized in that, The axial flow regulating valve also includes an actuator (a) mounted on the valve body (1). One end of the valve stem (4) passes through the mounting base (7) and the valve body (1) and is connected to the actuator (a). The actuator (a) is configured to drive the valve stem (4) to reciprocate along its axial direction.

7. An axial flow regulating valve according to claim 1, characterized in that, The guide hole (31) is provided with an internal thread near the hole wall of the valve seat (2), and the plug (8) is provided with an external thread on its outer wall. The plug (8) is screwed to the hole wall of the guide hole (31).

8. An axial flow regulating valve according to claim 7, characterized in that, The plug (8) includes a connected threaded part and an abutment part. The size of the threaded part is smaller than the size of the abutment part. The external thread is provided on the threaded part. The end face of the abutment part circumferentially abuts against the end face of the valve core (3).

9. An axial flow regulating valve according to claim 1, characterized in that, The sliding cavity (71) is arranged along the axial direction of the valve seat (2).

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