Speed regulation throttle valve

Abstract

The utility model discloses a speed regulation throttle valve which comprises a barrel type valve shell and a lower annular lip edge integrally formed at one end in the barrel type valve shell, a gas guide sleeve shaped like a Chinese character'tu 'and used for guiding fluid media is installed in the lower annular lip edge, and a conical valve needle is installed at the other end in the barrel type valve shell in a sliding mode. The bottom end of the conical valve needle extends into the air guide sleeve shaped like the Chinese character'tu ', a driving structure used for pulling the conical valve needle to move up and down is installed at the top end of the cylindrical valve shell, and a multi-layer sealing structure is installed between the driving structure and the conical valve needle. The multi-stage sealing structure is used for blocking so as to prevent fluid media from seeping from the top end of the cylindrical valve shell and the driving structure, the sealing structure between the conical valve needle and the driving structure is optimized, and particularly, the leakage risk can be remarkably reduced at key parts such as the top end of the conical valve needle, and the service life of the valve is prolonged. Therefore, more accurate and controllable operation of the throttle valve is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of throttle valves, specifically a speed-regulating throttle valve. Background Technique

[0002] The speed-regulating throttle valve is a key component in a hydraulic system, mainly composed of a valve body, a valve core, a throttle orifice, a spring, and a control unit. The valve body, as the main housing, bears the system pressure, connects the pipelines, and houses other components. The valve core is a movable core component, and its position determines the opening and closing degree of the throttle orifice, thereby regulating the flow rate and speed of the fluid. The throttle orifice is located between the valve core and the valve seat, restricting the flow rate of the fluid through small holes or slots. The spring is used to apply force in some designs to help control the position of the valve core or ensure the return of the valve core when the control signal is lost. The control unit includes solenoid valves, proportional valves, etc., which control the movement of the valve core through these units to achieve precise regulation of the flow rate and speed; for example, a needle-type throttle valve capable of speed regulation disclosed in the authorized publication number CN218031424U, including a valve body with a liquid inlet and a liquid outlet, and also including a lower valve seat, which is rotationally connected to the position near the liquid outlet in the valve cavity of the valve body through threads; an upper valve seat, which is slidably connected to the position far from the liquid outlet in the valve cavity of the valve body; a driving sleeve, which is closely attached to the upper end surface of the upper valve seat; a fixing nut, which is rotationally connected to the driving sleeve and is threadedly connected to the valve body; it can not only make the valve core move only vertically up and down, but also play a role in limiting the position of the valve core, so that the valve core will not move randomly under the impact of water flow. However, in the process of using this technical solution, no sealing element is provided between the rotating rod and the upper valve seat. At this time, the flowing medium in the throttle valve is likely to seep out through the gaps between the rotating rod and the upper valve seat, through the driving sleeve and the fixing nut. Once the control medium leaks, the system pressure will decrease accordingly, thus affecting the precise control and action speed of the hydraulic actuator. Content of the Utility Model

[0003] The purpose of the utility model is to provide a speed-regulating throttle valve, in which a multi-stage sealing structure is arranged at the top of the conical valve needle. The multi-stage sealing structure is used to eliminate the gaps between the conical valve needle, the threaded adjusting rod and the inner wall of the cylindrical valve housing, so as to prevent the medium in the throttle valve from overflowing, in order to solve the problems raised in the above background technique.

[0004] To achieve the above object, the present utility model provides the following technical solutions: a speed control throttle valve, comprising a cylindrical valve housing and a lower annular lip integrally formed at one end inside the cylindrical valve housing, and a T-shaped air guide sleeve for guiding fluid medium is installed inside the lower annular lip. A conical valve needle is slidably installed at the other end inside the cylindrical valve housing, and the bottom end of the conical valve needle extends into the inside of the T-shaped air guide sleeve. A driving structure for pulling the conical valve needle to move up and down is installed at the top end of the cylindrical valve housing. A multi-layer sealing structure is installed between the driving structure and the conical valve needle. First exhaust ports and second exhaust ports are respectively provided on the outer walls on both sides of the cylindrical valve housing, and a first exhaust joint and a second exhaust joint are respectively fixed inside the first exhaust port and the second exhaust port.

[0005] Preferably, a horn-shaped disc is integrally formed at the bottom end of the T-shaped air guide sleeve. The outer diameter of the horn-shaped disc gradually increases from one end close to the lower annular lip to the other end, and the outer diameter of the bottom edge of the horn-shaped disc is equal to the inner diameter of the cylindrical valve housing.

[0006] Preferably, an umbrella-shaped guiding sealing ring is fixed at the top end of the lower annular lip, and the inner edge of the umbrella-shaped guiding sealing ring is inlaid into the inside of the T-shaped air guide sleeve.

[0007] Preferably, a square hollow frame is fixed on the outer peripheral surface of the cylindrical valve housing, and the square hollow frame is made of a stainless steel member.

[0008] Preferably, the driving structure includes a threaded adjusting rod threadedly installed inside the cylindrical valve housing and an internally threaded locking wheel threadedly engaged with the outer peripheral surface of the threaded adjusting rod. The bottom end of the threaded adjusting rod is connected to the top end of the conical valve needle through a multi-layer sealing structure.

[0009] Preferably, the multi-layer sealing structure includes two annular lips integrally formed on the outer peripheral surface of the conical valve needle and an O-ring installed on the outer peripheral surface of the conical valve needle between the two annular lips. The annular lips and the O-ring are in interference fit with the inner cavity of the cylindrical valve housing.

[0010] Preferably, an elastic damping structure is provided on the outer peripheral surface of the conical valve needle. The elastic damping structure includes an upper annular lip integrally formed at one end inside the cylindrical valve housing, a retaining ring fixed on the outer peripheral surface of the conical valve needle, and a helical spring sleeved outside the conical valve needle between the retaining ring and the upper annular lip. The pitch of the lower half of the helical spring is smaller than that of the upper half.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: By providing a multi-stage sealing structure, a conical valve needle and other cooperating structures, the fluid medium located in the cylindrical valve housing is blocked by the multi-stage sealing structure at the top of the conical valve needle, preventing the fluid medium from leaking out from the top of the cylindrical valve housing and the driving structure. By optimizing the sealing structure between the conical valve needle and the driving structure, especially at key positions such as the top of the conical valve needle, the leakage risk can be significantly reduced, thereby ensuring more precise and controllable operation of the throttle valve and reducing control errors caused by leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the front view structural schematic diagram of the present utility model;

[0013] Figure 2 is the front view sectional structural schematic diagram of the present utility model;

[0014] Figure 3 is the three-dimensional structural schematic Figure 1 ;

[0015] Figure 4 is the three-dimensional structural schematic Figure 2 ;

[0016] Figure 5 is the three-dimensional structural schematic Figure 3 ;

[0017] Figure 6 is the three-dimensional sectional structural schematic diagram of the present utility model.

[0018] In the figures: 1, cylindrical valve housing; 101, lower annular lip; 102, first exhaust port; 103, second exhaust port; 2, T-shaped air guide sleeve; 201, horn disc; 3, umbrella-shaped guide sealing ring; 4, first exhaust joint; 5, second exhaust joint; 6, threaded adjusting rod; 7, internal thread locking wheel; 8, conical valve needle; 801, annular lip; 802, O-ring; 9, elastic damping structure; 901, upper annular lip; 902, retaining ring; 903, helical spring; 10, square hollow frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1-6, An embodiment provided by the present utility model: a speed control throttle valve, which includes a cylindrical valve housing 1 and a lower annular lip 101 integrally formed at one end inside the cylindrical valve housing 1. And a T-shaped air guide sleeve 2 for guiding the flowing fluid medium is installed inside the lower annular lip 101. A square hollow frame 10 is fixed on the outer peripheral surface of the cylindrical valve housing 1, and the square hollow frame 10 is made of a stainless steel component;

[0021] At the other end inside the cylindrical valve housing 1, a conical valve needle 8 is slidably installed. The bottom end of the conical valve needle 8 extends into the inside of the T-shaped air guide sleeve 2. At the top end of the cylindrical valve housing 1, a driving structure for pulling the conical valve needle 8 to move up and down is installed. A multi-layer sealing structure is installed between the driving structure and the conical valve needle 8. On the outer walls of both sides of the cylindrical valve housing 1, a first exhaust port 102 and a second exhaust port 103 are respectively provided. Inside the first exhaust port 102 and the second exhaust port 103, a first exhaust joint 4 and a second exhaust joint 5 are respectively fixed;

[0022] At the bottom end of the T-shaped air guide sleeve 2, a horn-shaped disc 201 is integrally formed. The outer diameter of the horn-shaped disc 201 gradually increases from one end close to the lower annular lip 101 to the other end. The outer diameter of the bottom edge of the horn-shaped disc 201 is equal to the inner diameter of the cylindrical valve housing 1. The air intake volume of the T-shaped air guide sleeve 2 is increased through the horn-shaped disc 201;

[0023] At the top end of the lower annular lip 101, an umbrella-shaped guiding sealing ring 3 is fixed. The inner edge of the umbrella-shaped guiding sealing ring 3 is inlaid into the inside of the T-shaped air guide sleeve 2. The umbrella-shaped guiding sealing ring 3 has a relatively large radial dimension, which can effectively guide and position the movement track of the conical valve needle 8 inside the T-shaped air guide sleeve 2, and further prevent the liquid or gas in the cylindrical valve housing 1 from leaking from the T-shaped air guide sleeve 2;

[0024] The driving structure includes a threaded adjusting rod 6 threadedly installed inside the cylindrical valve housing 1 and an internally threaded locking wheel 7 threadedly engaged with the outer peripheral surface of the threaded adjusting rod 6. The bottom end of the threaded adjusting rod 6 is connected to the top end of the conical valve needle 8 through a multi-layer sealing structure;

[0025] When the driving structure drives the conical valve needle 8 and the multi-stage sealing structure to move upward, the staff manually rotates the threaded adjusting rod 6, and the threaded adjusting rod 6 moves up and down inside the cylindrical valve housing 1, thereby controlling the position of the bottom end of the conical valve needle 8 inside the T-shaped air guide sleeve 2 to achieve the purpose of regulating the flow rate;

[0026] The multi-layer sealing structure includes two annular lips 801 integrally formed on the outer peripheral surface of the conical valve needle 8 and an O-ring 802 installed on the outer peripheral surface of the conical valve needle 8 between the two annular lips 801. The annular lips 801 and the O-ring 802 are both in interference fit with the inner cavity of the cylindrical valve housing 1. During the up and down sliding of the conical valve needle 8 and the threaded adjusting rod 6, the outer peripheral surfaces of the upper and lower annular lips 801 are in interference fit with the inner wall surface of the cylindrical valve housing 1, thereby effectively increasing the compression amount and contact area of the sealing member and forming two sealing surfaces, which can better adapt to different working pressures and temperature changes and ensure the stability and reliability of the seal;

[0027] The O-ring 802 between the two annular lips 801 forms a third sealing surface. The O-ring 802 can maintain good sealing performance under high pressure and low temperature conditions to prevent the leakage of liquid or gas fluid;

[0028] An elastic damping structure 9 is provided on the outer peripheral surface of the conical valve needle 8. The elastic damping structure 9 includes an upper annular lip 901 integrally formed at one end inside the cylindrical valve housing 1, a retaining ring 902 fixed on the outer peripheral surface of the conical valve needle 8, and a helical spring 903 sleeved outside the conical valve needle 8 between the retaining ring 902 and the upper annular lip 901. The pitch of the lower half of the helical spring 903 is smaller than that of the upper half. During the process of the staff manually screwing the threaded adjusting rod 6 upward, the conical valve needle 8 and the retaining ring 902 move upward together. At this time, the helical spring 903 located between the retaining ring 902 and the upper annular lip 901 is compressed. The pitch spacing of the upper half and the lower half of the helical spring 903 is different. As the compression amount of the helical spring 903 increases, the screwing resistance of the user also increases accordingly, thereby feeding back the upward movement amount of the conical valve needle 8 at this time, that is, the opening degree of this throttle valve.

[0029] When the embodiment of the present application is in use, first, the staff connects the bottom opening of the cylindrical valve housing 1 to other components in the hydraulic system, such as a hydraulic pump, a hydraulic pipeline, etc., and connects the first exhaust joint 4 and the second exhaust joint 5 to the actuator. The first exhaust joint 4 and the second exhaust joint 5 can be tightly connected to the actuator through their threaded ports. Then, the supply medium in the hydraulic system first enters the T-shaped air guide sleeve 2. At this time, the bottom end of the conical valve needle 8 plugs the top opening of the T-shaped air guide sleeve 2. The staff manually operates the driving structure, and the driving structure drives the multi-layer sealing structure and the conical valve needle 8 to move upward together, so that the bottom end of the conical valve needle 8 gradually moves out of the T-shaped air guide sleeve 2. The position of the conical valve needle 8 determines the opening degree of the T-shaped air guide sleeve 2, thereby controlling the flow rate of the fluid. At this time, the fluid medium is discharged to the next-level actuator through the first exhaust port 102, the second exhaust port 103, the first exhaust joint 4, and the second exhaust joint 5. The fluid medium in the cylindrical valve housing 1 is blocked by the multi-stage sealing structure at the top of the conical valve needle 8 to prevent the fluid medium from leaking out from the top of the cylindrical valve housing 1 and the driving structure. By optimizing the sealing structure between the conical valve needle 8 and the driving structure, especially at the key part such as the top of the conical valve needle 8, the leakage risk can be significantly reduced, so as to ensure that the throttle valve operates more precisely and controllably, reduce the control error caused by leakage, and improve the response speed and operation accuracy of the fluid system.

Claims

1. Speed ​​regulating throttle valve, characterized by: The invention comprises a cylindrical valve housing (1) and a lower annular lip (101) integrally formed at one end of the cylindrical valve housing (1), wherein a U-shaped air guide sleeve (2) for guiding a fluid medium is installed inside the lower annular lip (101), a conical valve needle (8) is slidably installed at the other end of the cylindrical valve housing (1), and the bottom end of the conical valve needle (8) extends to the inside of the U-shaped air guide sleeve (2), a driving structure for pulling the conical valve needle (8) to move up and down is installed at the top end of the cylindrical valve housing (1), and a multi-layer sealing structure is installed between the driving structure and the conical valve needle (8), and a first exhaust port (102) and a second exhaust port (103) are respectively arranged on the outer walls on both sides of the cylindrical valve housing (1), and a first exhaust joint (4) and a second exhaust joint (5) are respectively fixed inside the first exhaust port (102) and the second exhaust port (103).

2. The speed regulating throttle valve according to claim 1, characterized in that: A trumpet disc (201) is integrally formed at the bottom end of the U-shaped air guide sleeve (2), and the outer diameter of the trumpet disc (201) gradually increases from one end close to the lower annular lip (101) to the other end, and the outer diameter of the bottom edge of the trumpet disc (201) is equal to the inner diameter of the cylindrical valve housing (1).

3. The speed regulating throttle valve according to claim 1, characterized in that: An umbrella-mounted guide sealing ring (3) is fixed to the top end of the lower annular lip edge (101), and the inner edge of the umbrella-mounted guide sealing ring (3) is embedded in the interior of the Chinese-shaped air guide sleeve (2).

4. The speed regulating throttle valve according to claim 1, characterized in that: A square hollow frame (10) is fixed on the outer peripheral surface of the cylindrical valve housing (1), and the square hollow frame (10) is made of a stainless steel component.

5. The speed regulating throttle valve according to claim 1, characterized in that: The driving structure comprises a threaded adjustment rod (6) threadedly mounted inside the cylindrical valve housing (1) and an internal threaded locking wheel (7) threadedly matched with the outer circumferential surface of the threaded adjustment rod (6), and the bottom end of the threaded adjustment rod (6) is connected to the top end of the conical valve needle (8) via a multi-layer sealing structure.

6. The speed regulating throttle valve according to claim 5, characterized in that: The multi-layer sealing structure comprises two annular lips (801) integrally formed on the outer peripheral surface of the conical valve needle (8) and an O-ring (802) installed on the outer peripheral surface of the conical valve needle (8) between the two annular lips (801); the annular lips (801) and the O-ring (802) are both interference fit with the inner cavity of the cylindrical valve housing (1).

7. The speed regulating throttle valve according to claim 1, characterized in that: The outer circumferential surface of the conical valve needle (8) is provided with an elastic damping structure (9), and the elastic damping structure (9) includes an upper annular lip (901) integrally formed at one end of the inner part of the cylindrical valve housing (1), a retaining ring (902) fixed to the outer circumferential surface of the conical valve needle (8), and a coil spring (903) mounted on the outside of the conical valve needle (8) between the retaining ring (902) and the upper annular lip (901), wherein the turn pitch of the lower half of the coil spring (903) is smaller than the turn pitch of the upper half.

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