Axial flow valve

Abstract

This utility model relates to the field of valve technology and discloses an axial flow valve. The axial flow valve includes a valve body with an internal chamber, a valve stem extending at least partially into the chamber and having a driving part; a piston rod disposed in the chamber and having a driven part; and a transmission mechanism drivingly connecting the driving part and the driven part. The valve stem is capable of linear motion, driving the piston rod to perform linear motion via the transmission mechanism, thereby adjusting the position of the piston on the piston rod in a linear stroke valve. This utility model converts the linear motion of the valve stem into the linear motion of the piston rod to adjust the piston position, realizing an operation mode that uses the linear motion of the valve stem to adjust the piston position. The linear stroke drive has a direct motion path, making it easier to achieve high-precision linear motion control. Therefore, it is less difficult to achieve linear stroke by driving the valve stem electrically, pneumatically, or hydraulically, and the accuracy of the valve stem's linear motion is easy to control, thereby improving the reliability of the valve stem's linear motion and the stability of the axial flow valve's regulation.

Description

Technical Field

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

[0002] An axial flow control valve consists of an axial flow valve body and a piston-type flow-blocking element installed on its internal central axis. By controlling the linear movement of the piston along the axis, the area of ​​the flow-blocking surface is adjusted, thereby controlling the flow rate and pressure. Furthermore, axial flow control valves offer advantages such as not interfering with the fluid flow path, low relative flow resistance, low vibration, and stable and sensitive fluid control.

[0003] The common adjustment method for current axial flow control valves is as follows: the valve stem is rotated by a turbine housing, and the transmission assembly between the valve stem and piston rod converts the rotation of the valve stem into the reciprocating motion of the piston rod, thereby adjusting the piston position through reciprocating motion. This method, where the valve stem rotation drives the piston rod and piston movement via a transmission assembly, typically uses electric, pneumatic, or hydraulic actuation. However, achieving the required rotation stroke using electric, pneumatic, or hydraulic actuation is difficult, and controlling the rotational precision of the valve stem is challenging, resulting in poor reliability of the valve stem rotation and affecting the stability of the axial flow valve's regulation. Utility Model Content

[0004] In view of this, the present invention provides an axial flow valve to solve the problems of the difficulty in realizing the rotation stroke of the valve stem by electric drive, pneumatic or hydraulic drive in the current axial flow valve, the difficulty in controlling the rotation accuracy of the valve stem, the poor reliability of the valve stem rotation, and the impact on the adjustment stability of the axial flow valve.

[0005] This utility model provides an axial flow valve, including a valve body with an internal chamber, and the axial flow valve further includes:

[0006] The valve stem extends at least partially into the chamber and is provided with a drive portion;

[0007] A piston rod is disposed in the chamber and has a driven part;

[0008] A transmission mechanism is provided, which is connected between the driving part and the driven part.

[0009] The valve stem is capable of linear motion, which drives the piston rod to move linearly via the transmission mechanism, thereby adjusting the position of the piston on the piston rod.

[0010] Beneficial Effects: This utility model provides an axial flow valve. By setting a driving part on the valve stem, a driven part on the piston rod, and a transmission mechanism between the driving and driven parts, the linear motion of the valve stem is converted into the linear motion of the piston rod in a linear stroke valve to adjust the piston position. This achieves an operation mode that uses the linear motion of the valve stem to adjust the piston position. The linear stroke drive has a direct motion path, making it easier to achieve high-precision linear motion control. Therefore, it is less difficult to achieve linear stroke by driving the valve stem electrically, pneumatically, or hydraulically, and the accuracy of the linear motion of the valve stem is easy to control, thereby improving the reliability of the valve stem's linear motion and thus improving the stability of the axial flow valve's regulation.

[0011] Furthermore, compared to the rotational adjustment using a 90-degree angle rotation stroke in related technologies, the linear valve in this embodiment adjusts the piston position by linear movement of the valve stem. This achieves linear adjustment of the valve stem to control the position of the piston rod and piston, and also has the advantages of stable valve stem output, a large and precise controllable and adjustable range of the piston rod and piston, and the ability to make large-scale adjustments to the valve stem output and linear distance.

[0012] In one optional embodiment, the driving part is configured as a driving rack, the driven part is configured as a driven rack, and the transmission mechanism is configured as a gear mechanism;

[0013] The gear mechanism has a first gear section and a second gear section arranged coaxially. The first gear section meshes with the driving rack, and the second gear section meshes with the driven rack.

[0014] Beneficial effects: The transmission between the valve stem and the transmission mechanism, and between the transmission mechanism and the piston rod, is achieved through a gear and rack mechanism, resulting in smooth transmission and high transmission efficiency. At the same time, the structure is simple and easy to manufacture.

[0015] In one alternative embodiment, the number of teeth in the first gear portion is the same as the number of teeth in the second gear portion.

[0016] Beneficial effects: Setting the number of teeth in the first gear section to be the same as that in the second gear section ensures that the transmission ratio between the valve rod and the piston rod is the same, thus ensuring the stability of motion transmission between the valve rod and the piston rod.

[0017] In one alternative embodiment, the number of teeth in the first gear portion is greater than the number of teeth in the second gear portion.

[0018] Beneficial effects: Setting the number of teeth in the first gear section to be greater than the number of teeth in the second gear section increases the transmission ratio of the gear mechanism between the valve stem and the piston rod, making it easier to adjust the valve stem with less effort. At the same time, it also allows for precise control of the piston rod and the piston on it by precisely controlling the stroke of the valve stem, further improving the adjustment accuracy of the axial flow valve.

[0019] In one optional embodiment, there are two first gear portions and one second gear portion, with the two first gear portions located on both sides of the second gear portion along its axial direction.

[0020] The drive rack has two racks, and the two drive racks respectively mesh with the two first gear sections;

[0021] The driven rack is provided as one unit, which passes between the two driving racks and meshes with the second gear.

[0022] Beneficial effects: By setting two first gear sections and simultaneously setting two drive racks to cooperate with them, the forces on both sides of the gear mechanism are balanced, improving the stability of the linear motion input driving force of the valve stem, thereby further improving the stability of the axial flow valve regulation.

[0023] In one optional embodiment, there is one first gear portion and two second gear portions, with the two second gear portions located on both sides of the first gear portion along its axial direction.

[0024] The driven rack is provided with two racks, and the two driven racks respectively mesh with the two second gear parts;

[0025] The drive rack is provided as one unit, which passes between the two driven racks and meshes with the first gear.

[0026] Beneficial effects: By setting two second gear sections and simultaneously setting two driven racks to cooperate with them, the forces on both sides of the gear mechanism are balanced, improving the stability of the linear motion output regulating force of the piston rod, thereby further improving the stability of the axial flow valve regulation.

[0027] In one optional embodiment, the valve body is provided with a limiting groove that conforms to the shape of the valve stem, and the valve stem is movably disposed in the limiting groove;

[0028] And / or, the axial flow valve further includes a limiting seat disposed on the valve body, and one end of the piston rod is movably disposed on the limiting seat;

[0029] And / or, the axial flow valve further includes a mounting base disposed on the valve body, and the transmission mechanism is movably disposed on the mounting base.

[0030] Beneficial effects: The limiting groove within the valve body, conforming to the shape of the valve stem, provides an installation position for the valve stem, ensuring the stability of its movement. The limiting seat on the valve body provides an installation position for the piston rod, ensuring the stability of its movement. The mounting seat on the valve body provides an installation position for the transmission mechanism, ensuring the stability of its movement.

[0031] In one optional embodiment, the valve body is provided with a partition structure to divide the chamber into a first chamber and a second chamber, wherein the first chamber is provided with the valve stem, the transmission mechanism and at least a portion of the piston rod;

[0032] The end of the piston rod away from the limiting seat passes through the partition structure and extends into the second chamber, and the portion of the piston rod extending into the second chamber is provided with the piston.

[0033] Beneficial effects: The valve body chamber is divided into a first chamber for the drive assembly and a second chamber for the piston to adjust by using a partition structure.

[0034] In one alternative embodiment, the axial direction of the valve stem is angled relative to the axial direction of the piston rod.

[0035] Beneficial effect: The axial direction of the valve stem is set at an angle to the axial direction of the piston rod to ensure that the linear movement of the valve stem drives the piston rod and the piston on it to move linearly.

[0036] In one alternative embodiment, the axial direction of the valve stem is perpendicular to the axial direction of the piston rod.

[0037] Beneficial effects: By limiting the axial direction of the valve stem to be perpendicular to the axial direction of the piston rod, the adjustment efficiency of the linear motion of the valve stem driving the piston rod and the piston on it to perform linear motion is ensured. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 A schematic diagram of the structure of an axial flow valve provided by this utility model;

[0040] Figure 2 A first sectional view of an axial flow valve provided by this utility model;

[0041] Figure 3 A schematic diagram of the structure of the valve rod, piston rod and gear mechanism in an axial flow valve provided by this utility model;

[0042] Figure 4 A cross-sectional view of the valve body provided by this utility model;

[0043] Figure 5This is a second sectional view of an axial flow valve provided by the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Valve body; 101. Separation structure; 102. First chamber; 103. Second chamber; 104. Limiting groove;

[0046] 2. Valve stem; 201. Drive rack;

[0047] 3. Piston rod; 301. Driven rack;

[0048] 4. Gear mechanism; 401. First gear section; 402. Second gear section;

[0049] 5. Limiting seat;

[0050] 6. Mounting bracket. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0052] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical 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 utility model based on the specific circumstances.

[0054] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0055] The following is combined with Figures 1-5 The following describes embodiments of the present invention.

[0056] According to an embodiment of this utility model, an axial flow valve is provided, such as... Figure 1 , Figure 2 As shown, it includes a valve body 1 with an internal chamber, a valve stem 2, a piston rod 3, and a transmission mechanism.

[0057] The valve stem 2 extends at least partially into the chamber and is provided with a driving part; the piston rod 3 is located in the chamber and is provided with a driven part; a transmission mechanism is connected between the driving part and the driven part; the valve stem 2 is capable of linear motion, so as to drive the piston rod 3 to linear motion through the transmission mechanism, thereby adjusting the position of the piston on the piston rod 3.

[0058] In the above embodiments, by providing a driving part on the valve stem 2, a driven part on the piston rod 3, and a transmission mechanism between the driving and driven parts, the linear motion of the valve stem 2 is converted into the linear motion of the piston rod 3 in a linear-stroke valve to adjust the piston position. This achieves the operation mode of adjusting the piston position using the linear motion of the valve stem 2. The linear-stroke drive has a direct motion path, making it easier to achieve high-precision linear motion control. Therefore, it is less difficult to achieve linear stroke by driving the valve stem 2 electrically, pneumatically, or hydraulically, and the linear motion accuracy of the valve stem 2 is easy to control, thereby improving the reliability of the linear motion of the valve stem 2 and thus improving the stability of the axial flow valve regulation.

[0059] Furthermore, compared to the rotational adjustment using a 90-degree angle rotation stroke in related technologies, the linear stroke valve of this utility model adjusts the piston position by linearly moving the valve stem 2. This achieves the linear adjustment of the valve stem 2 to control the position of the piston rod 3 and the piston. It also has the advantages of stable output of the valve stem 2, a large and precise controllable and adjustable range of the piston rod 3 and the piston, and the ability to make large-scale adjustments to the output of the valve stem 2 and the linear distance.

[0060] Specifically, the linear motion of the piston rod 3 is achieved by inputting linear power to the valve stem 2 through the driving part of the valve stem 2, the driven part of the piston rod 3, and the transmission mechanism between them. Driving the valve stem 2 linearly via electric, pneumatic, or hydraulic power is simpler for controlling pneumatic and hydraulic pressure compared to driving the valve stem 2 rotationally via electric, pneumatic, or hydraulic power, thus reducing the difficulty of implementation. It should be noted that in this embodiment, when the valve stem 2 performs reciprocating linear motion, the transmission mechanism can drive the piston rod 3 to perform reciprocating linear motion, thereby adjusting the forward and backward position of the piston on the piston rod 3, and consequently adjusting the flow rate of the medium in the chamber of the valve body 1.

[0061] Furthermore, this embodiment does not limit the specific structural form and cooperation method of the driving part of valve stem 2, the driven part of piston rod 3, and the transmission mechanism between them.

[0062] In one embodiment, the driving part of the valve stem 2 and the driven part of the piston rod 3 are both set as racks, and the transmission mechanism is set as a gear that meshes between the two racks simultaneously; the rack on the valve stem 2 moves linearly to drive the gear to rotate, and the rotation of the gear drives the rack on the piston rod 3 to move linearly, thereby causing the piston rod 3 and the piston on it to move linearly.

[0063] In another embodiment, the driving part of the valve stem 2 is a rack, the driven part of the piston rod 3 is a screw in the lead screw, and the transmission mechanism is a nut in the lead screw. The outer periphery of the nut is provided with gear teeth that mesh with the rack on the valve stem 2. The rack on the valve stem 2 moves linearly and drives the nut in the lead screw to rotate through the gear teeth. The nut in the lead screw then drives the screw in the lead screw to move linearly, thereby causing the piston rod 3 and the piston on it to move linearly.

[0064] In some embodiments, such as Figure 2 , Figure 3 As shown, the driving part is a driving rack 201, the driven part is a driven rack 301, and the transmission mechanism is a gear mechanism 4. The gear mechanism 4 has a first gear part 401 and a second gear part 402 arranged coaxially. The first gear part 401 meshes with the driving rack 201, and the second gear part 402 meshes with the driven rack 301.

[0065] In the above embodiments, the transmission between the valve stem 2 and the transmission mechanism, and between the transmission mechanism and the piston rod 3, is achieved by a gear and rack mechanism, which provides smooth transmission and high transmission efficiency, while also being simple in structure and easy to manufacture.

[0066] Specifically, a drive rack 201 is provided on the portion of the valve stem 2 that extends into the chamber to form a drive part; a driven rack 301 is provided on the portion of the piston rod 3 that is located in the chamber to form a driven part; the gear mechanism 4 has two coaxially arranged gear teeth, a first gear part 401 and a second gear part 402, which mesh with the drive rack 201 and the driven rack 301 respectively. The linear motion of the drive rack 201 on the valve stem 2 drives the first gear part 401 on the gear mechanism 4 to rotate, and the rotation of the first gear part 401 on the gear mechanism 4 drives the second gear part 402 on the gear mechanism 4 to rotate synchronously, thereby driving the driven rack 301 on the piston rod 3 to move linearly, thus causing the piston rod 3 and the piston on it to move linearly.

[0067] In some embodiments, the number of teeth of the first gear portion 401 is the same as the number of teeth of the second gear portion 402.

[0068] In the above embodiment, the number of teeth of the first gear part 401 is set to be the same as that of the second gear part 402, so that the transmission ratio of the gear mechanism 4 between the valve rod 2 and the piston rod 3 is the same, thereby ensuring the stability of motion transmission between the valve rod 2 and the piston rod 3.

[0069] Specifically, when the number of teeth in the first gear section 401 is the same as the number of teeth in the second gear section 402, the rotational stroke of the outer circumference of the first gear section 401 is the same as the rotational stroke of the outer circumference of the second gear section 402. Therefore, it is sufficient to design the number of teeth of the drive rack 201 on the valve stem 2 to be equivalent to the number of teeth of the driven rack 301 on the piston rod 3. This ensures smooth gear transmission between the drive rack 201 and the first gear section 401, and between the second gear section 402 and the piston rod 3, while reducing the machining cost of the gear teeth or rack teeth.

[0070] In some embodiments, such as Figure 2 , Figure 3 As shown, the number of teeth in the first gear section 401 is greater than the number of teeth in the second gear section 402.

[0071] In the above embodiment, the number of teeth of the first gear part 401 is set to be greater than the number of teeth of the second gear part 402, thereby increasing the transmission ratio of the gear mechanism 4 between the valve rod 2 and the piston rod 3. This makes it easier to adjust the valve rod 2 with less effort, and at the same time, it can also accurately control the stroke of the piston rod 3 and the piston on it by precisely controlling the stroke of the valve rod 2, thereby further improving the adjustment accuracy of the axial flow valve.

[0072] Specifically, when the number of teeth of the first gear section 401 is greater than the number of teeth of the second gear section 402, the transmission ratio between the first gear section 401 and the second gear section 402 increases compared to when the number of teeth is the same. This increases the transmission ratio between the valve rod 2 and the piston rod 3 in the gear mechanism 4, thereby enabling effortless adjustment of the valve rod 2. At the same time, due to the increased transmission ratio between the valve rod 2 and the piston rod 3, the long-distance linear motion of the valve rod 2 is required to drive the piston rod 3 to perform short-distance position adjustment. This allows for better micro-adjustment of the piston rod 3 and its piston through the valve rod 2, thereby enabling precise control of the stroke of the valve rod 2 to precisely control the stroke of the piston rod 3 and its piston.

[0073] Furthermore, when the number of teeth of the first gear section 401 is greater than the number of teeth of the second gear section 402, the rotational stroke of the outer circumference of the first gear section 401 is greater than the rotational stroke of the outer circumference of the second gear section 402. Therefore, the number of teeth of the drive rack 201 on the valve stem 2 is designed to be greater than the number of teeth of the driven rack 301 on the piston rod 3, thereby ensuring smooth gear transmission between the drive rack 201 and the first gear section 401, and between the second gear section 402 and the piston rod 3.

[0074] In some embodiments, there are two first gear sections 401 and one second gear section 402, with the two first gear sections 401 respectively located on both sides of the second gear section 402 along its axial direction; there are two drive racks 201, which mesh with the two first gear sections 401 respectively; and there is one driven rack 301, which passes between the two drive racks 201 and meshes with the second gear section 402.

[0075] In the above embodiment, two first gear sections 401 are provided with two drive racks 201 respectively to cooperate with them, so that the forces on both sides of the gear mechanism 4 are balanced, improving the stability of the linear motion input driving force of the valve stem 2, thereby further improving the stability of the axial flow valve regulation.

[0076] Specifically, the gear mechanism 4 includes three gear teeth, which are distributed sequentially as first gear part 401-second gear part 402-first gear part 401; the valve stem 2 has two drive racks 201 on the part of the structure that extends into the chamber, and they mesh with the two first gear parts 401 respectively. The driven rack 301 passes through the gap between the two drive racks 201, thereby meshing with the second gear part 402 between the two first gear parts 401.

[0077] In some embodiments, there is one first gear section 401 and two second gear sections 402, which are respectively disposed on both sides of the first gear section 401 along the axial direction; there are two driven racks 301, which mesh with the two second gear sections 402 respectively; there is one driving rack 201, which passes between the two driven racks 301 and meshes with the first gear section 401.

[0078] In the above embodiment, two second gear sections 402 are provided with two driven racks 301 respectively to cooperate with them, so that the forces on both sides of the gear mechanism 4 are balanced, improving the stability of the linear motion output adjustment force of the piston rod 3, thereby further improving the stability of the axial flow valve adjustment.

[0079] Specifically, the gear mechanism 4 includes three gear teeth, which are distributed sequentially as second gear part 402-first gear part 401-second gear part 402; the piston rod 3 is provided with two driven racks 301 on the part of the structure in the chamber, and respectively meshes with the two second gear parts 402, driving the rack 201 to pass through the gap between the two driven racks 301, thereby meshing with the first gear part 401 between the two second gear parts 402.

[0080] In some embodiments, such as Figure 2 , Figure 4 As shown, the valve body 1 is provided with a limiting groove 104 that is shaped to match the valve stem 2, and the valve stem 2 is movably disposed in the limiting groove 104.

[0081] In the above embodiment, the limiting groove 104 inside the valve body 1, which is conformally arranged to the valve stem 2, provides an installation position for the valve stem 2 and ensures the stability of the movement of the valve stem 2.

[0082] Specifically, the valve body 1 is provided with a limit groove 104 that is integrally linear and located on the inner wall of the valve body 1. The limit groove 104 is used to limit the movement of the valve stem 2 to prevent the valve stem 2 from tilting when it moves.

[0083] In some embodiments, such as Figure 2 As shown, the axial flow valve also includes a limiting seat 5 disposed on the valve body 1, and one end of the piston rod 3 is movably disposed on the limiting seat 5.

[0084] In the above embodiment, the limiting seat 5 provided on the valve body 1 provides an installation position for the piston rod 3, ensuring the stability of the piston rod 3's movement.

[0085] Specifically, the limiting seat 5 is fixedly connected to the valve body 1 by fasteners such as bolts; the limiting seat 5 is provided with a groove that is conformally set to the piston rod 3, and the groove is used to limit the movement of the piston rod 3 to prevent the piston rod 3 from tilting when it moves.

[0086] In some embodiments, such as Figure 5 As shown, the axial flow valve also includes a mounting base 6 disposed on the valve body 1, and the transmission mechanism is movably disposed on the mounting base 6.

[0087] In the above embodiment, the mounting seat 6 provided on the valve body 1 provides an installation position for the transmission mechanism, ensuring the stability of the transmission mechanism's movement.

[0088] Specifically, the mounting base 6 is fixedly connected to the inner wall of the valve body 1 by fasteners such as bolts; when the transmission mechanism is set as a gear mechanism 4, the mounting base 6 is provided with two and each has a rotating mounting position. The two ends of the gear mechanism 4 are respectively rotatably connected to the corresponding rotating mounting positions, thereby ensuring that the gear mechanism 4 is driven to rotate stably.

[0089] In some embodiments, such as Figure 2 As shown, the valve body 1 is provided with a partition structure 101, which divides the chamber into a first chamber 102 and a second chamber 103. The first chamber 102 is provided with a valve stem 2, a transmission mechanism and at least a part of the piston rod 3. The end of the piston rod 3 away from the limiting seat 5 passes through the partition structure 101 and extends into the second chamber 103. The part of the piston rod 3 extending into the second chamber 103 is provided with a piston.

[0090] In the above embodiment, the valve body 1 is divided into a first chamber 102 for setting up a drive assembly and a second chamber 103 for setting up a piston for adjustment by using the partition structure 101.

[0091] Specifically, the partition structure 101 is fixedly connected to the inner wall of the valve body 1 by fasteners such as bolts; the linear movement of the piston rod 3 extending into the second chamber 103 drives the piston to move linearly in the second chamber 103, thereby adjusting the flow rate of the medium in the second chamber 103 of the valve body 1.

[0092] In some embodiments, such as Figure 2 , Figure 3 As shown, the axial direction of valve stem 2 is set at an angle to the axial direction of piston rod 3.

[0093] In the above embodiment, the axial direction of the valve stem 2 is set at an angle to the axial direction of the piston rod 3 to ensure that the linear movement of the valve stem 2 drives the piston rod 3 and the piston on it to move linearly.

[0094] Specifically, the angle between the axial direction of valve stem 2 and the axial direction of piston rod 3 is in the range of 0-90°.

[0095] In some embodiments, such as Figure 2 , Figure 3 As shown, in a preferred embodiment, the axial direction of the valve stem 2 is perpendicular to the axial direction of the piston rod 3.

[0096] In the above embodiments, the axial direction of the valve stem 2 is set perpendicular to the axial direction of the piston rod 3 to ensure the adjustment efficiency of the linear movement of the valve stem 2 driving the piston rod 3 and the piston on it to perform linear movement.

[0097] Specifically, the angle between the axial direction of valve stem 2 and the axial direction of piston rod 3 is 90°.

[0098] Furthermore, in Figure 2 From the perspective shown, when the drive rack 201 on the valve stem 2 moves downward, it causes the first gear 401 on the gear mechanism 4 to rotate clockwise. The rotation of the first gear 401 causes the second gear 402 on the gear mechanism 4 to rotate clockwise simultaneously, which in turn causes the driven rack 301 on the piston rod 3 to move to the left, thus causing the piston rod 3 and its piston to move to the left for flow regulation. Conversely, when the drive rack 201 on the valve stem 2 moves upward, it causes the first gear 401 on the gear mechanism 4 to rotate counterclockwise. The rotation of the first gear 401 on the gear mechanism 4 causes the second gear 402 on the gear mechanism 4 to rotate counterclockwise simultaneously, which in turn causes the driven rack 301 on the piston rod 3 to move to the right, thus causing the piston rod 3 and its piston to move to the right for flow regulation.

[0099] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. An axial flow valve, comprising a valve body (1) having an internal chamber, characterized in that, The axial flow valve also includes: The valve stem (2) extends at least partially into the chamber and is provided with a drive part; Piston rod (3) is disposed in the chamber and is provided with a driven part; A transmission mechanism is provided, which is connected between the driving part and the driven part. The valve stem (2) is capable of linear motion, which drives the piston rod (3) to move linearly through the transmission mechanism, thereby adjusting the position of the piston on the piston rod (3).

2. The axial flow valve according to claim 1, characterized in that, The driving part is configured as a driving rack (201), the driven part is configured as a driven rack (301), and the transmission mechanism is configured as a gear mechanism (4); The gear mechanism (4) has a first gear part (401) and a second gear part (402) arranged coaxially. The first gear part (401) meshes with the driving rack (201), and the second gear part (402) meshes with the driven rack (301).

3. The axial flow valve according to claim 2, characterized in that, The number of teeth in the first gear section (401) is the same as the number of teeth in the second gear section (402).

4. The axial flow valve according to claim 2, characterized in that, The number of teeth in the first gear section (401) is greater than the number of teeth in the second gear section (402).

5. The axial flow valve according to any one of claims 2-4, characterized in that, Two first gear parts (401) are provided, and one second gear part (402) is provided. The two first gear parts (401) are respectively provided on both sides of the second gear part (402) in the axial direction. The drive rack (201) is provided with two racks, and the two drive racks (201) respectively mesh with the two first gear parts (401); One driven rack (301) is provided, which passes between the two drive racks (201) and meshes with the second gear (402).

6. The axial flow valve according to any one of claims 2-4, characterized in that, The first gear part (401) is provided, and the second gear part (402) is provided two, with the two second gear parts (402) respectively located on both sides of the first gear part (401) along the axial direction; The driven rack (301) is provided in two parts, and the two driven racks (301) respectively mesh with the two second gear parts (402); The drive rack (201) is provided as one, which passes between the two driven racks (301) and meshes with the first gear part (401).

7. The axial flow valve according to any one of claims 1-4, characterized in that, The valve body (1) is provided with a limiting groove (104) that is conformally arranged to the valve stem (2), and the valve stem (2) is movably disposed in the limiting groove (104); And / or, the axial flow valve further includes a limiting seat (5) disposed on the valve body (1), and one end of the piston rod (3) is movably disposed on the limiting seat (5); And / or, the axial flow valve further includes a mounting base (6) disposed on the valve body (1), and the transmission mechanism is movably disposed on the mounting base (6).

8. The axial flow valve according to claim 7, characterized in that, The valve body (1) is provided with a partition structure (101) to divide the chamber into a first chamber (102) and a second chamber (103). The first chamber (102) is provided with the valve stem (2), the transmission mechanism and at least part of the piston rod (3). The piston rod (3) extends into the second chamber (103) through the partition structure (101) at one end away from the limiting seat (5), and the piston rod (3) extending into the second chamber (103) is provided with the piston.

9. The axial flow valve according to any one of claims 1-4 and 8, characterized in that, The axial direction of the valve stem (2) is set at an angle to the axial direction of the piston rod (3).

10. The axial flow valve according to claim 9, characterized in that, The axial direction of the valve stem (2) is perpendicular to the axial direction of the piston rod (3).

Images