Anti-sticking linear regulating valve

Abstract

The utility model relates to the technical field of governing valve, especially a linear governing valve of preventing jam, including governing valve body, the inside of governing valve body is opened with flow channel and valve cavity respectively, flow channel communicates with valve cavity, and the contact surface of flow channel and valve cavity is provided with valve rod, and the outer surface of the middle part guide section of valve rod is equipped with the elastic guide sealing body of taper, this linear governing valve is mutually supported through elastic guide sealing body, metal pre -tightening cone ring and disc spring, can produce position deviation when the valve rod, with the help of disc spring's pre -tightening force promotes metal pre -tightening cone ring, and axial thrust is converted into radial tight force and is extruded elastic guide sealing body, and the clearance of valve rod and sealing body is filled up and is corrected valve rod deflection, and the sustained greasing of cooperation lubricating cavity and L type lubricating channel forms stable lubricating film in the surface of sticking, effectively reduces the movement resistance of valve rod, guarantees the stable movement of valve rod along the axis, and the precision and operating stability of flow regulation are improved obviously.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, and in particular to a linear regulating valve that prevents jamming. Background Technology

[0002] A linear control valve is a type of control valve that controls flow rate by adjusting the opening degree. Its opening degree and flow rate have a linear proportional relationship under constant pressure difference. This valve has four flow regulation characteristics: linear, equal percentage, parabolic, and quick-opening. It is the core component for achieving precise flow control in fluid transportation systems and is widely used in petrochemical, metallurgical, and municipal water supply and drainage fields.

[0003] In actual operation, the valve stem of existing traditional linear control valves is prone to positional deviation due to thermal deformation and uneven wear over long-term work. The existing sealing and guiding structures are mostly rigid or single elastic structures, which cannot adaptively compensate for the gap and misalignment between the valve stem and the sealing components, resulting in increased valve stem movement resistance and even jamming. On the other hand, during operation, solid particles and fibrous impurities mixed in the flowing medium tend to accumulate in the gap between the valve core and the sealing sleeve. The existing control valve structure lacks an active impurity pushing and discharge mechanism. After the impurities accumulate, they will further increase the movement resistance of the valve core, exacerbate the jamming problem, and seriously affect the smoothness of the control valve's operation and the accuracy of flow regulation. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an anti-jamming linear regulating valve.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A linear regulating valve for preventing jamming includes a regulating valve body, wherein the regulating valve body has a flow channel and a valve cavity respectively, the flow channel and the valve cavity are connected, a valve stem is provided on the contact surface between the flow channel and the valve cavity, and a conical elastic guide seal is sleeved on the outer surface of the middle guide section of the valve stem, and the inner ring of the elastic guide seal is interference-fitted with the valve stem. A metal preloaded conical ring is fitted on the outer surface of the elastic guide seal. The inner ring of the metal preloaded conical ring is in contact with the outer conical surface of the elastic guide seal. Spring washers are evenly distributed circumferentially on one side of the metal preloaded conical ring. A disc spring is fixedly connected to the spring washer. One end of the disc spring is fixedly connected to the side of the valve cavity near the flow channel.

[0006] Preferably, an L-shaped lubrication hole is uniformly formed on one side of the outer wall of the elastic guide seal, an L-shaped lubrication channel is provided in the L-shaped lubrication hole, and a lubrication cavity is provided on the outer surface of the metal pre-tightening cone ring; The valve stem has an annular lubrication groove on the outer wall side near the elastic guide seal. One end of the L-shaped lubrication channel extends into the interior of the lubrication cavity and communicates with the lubrication cavity, while the other end extends into the annular lubrication groove. The interior of the lubrication cavity is filled with grease.

[0007] Preferably, a valve cover is fixedly connected to one side of the outer wall of the regulating valve body, and a sealing sleeve is fixedly connected to the inner contact surface of the valve cover and the regulating valve body. A valve core is sleeved inside the sealing sleeve, and the valve core is connected to the valve stem by a connecting spring.

[0008] Preferably, the outer surface of the valve core is fixedly connected with a helical ridge, and the inside of the sealing bushing is provided with a helical groove that matches the helical ridge, the depth of the helical groove being greater than the height of the helical ridge.

[0009] Preferably, the bottom of the spiral groove is evenly provided with a plurality of slag discharge holes, and the outer surface of the sealing bushing is provided with an annular sewage discharge cavity, wherein the slag discharge holes are connected to the interior of the annular sewage discharge cavity; The bottom of the annular sewage discharge chamber is fixedly connected to a sewage discharge pipe. A circular hole is opened on the bottom outer wall of the valve cover. The bottom of the sewage discharge pipe passes through the circular hole and extends to the outside of the valve cover. A one-way sewage discharge valve is provided at the bottom end of the sewage discharge pipe.

[0010] Preferably, the top of the regulating valve body is provided with an input port, which is connected to the interior of the flow channel, and the bottom of the regulating valve body is provided with an output port, which is connected to the interior of the valve cavity.

[0011] The beneficial effects of this utility model are: This linear control valve utilizes an elastic guide seal, a metal preloaded cone ring, and a disc spring in a coordinated manner. When the valve stem experiences positional deviation, the preload of the disc spring pushes the metal preloaded cone ring, converting the axial thrust into a radial clamping force that compresses the elastic guide seal. This adaptively fills the gap between the valve stem and the seal and corrects the valve stem misalignment. Simultaneously, the continuous grease supply from the lubrication chamber and L-shaped lubrication channel forms a stable lubricating film on the mating surface, effectively reducing the valve stem's movement resistance and ensuring stable movement of the valve stem along its axis. This significantly improves the accuracy and stability of flow regulation and prevents the valve stem from jamming due to thermal deformation or uneven wear.

[0012] This linear control valve utilizes the interaction between the spiral protrusions on the valve core surface and the spiral grooves inside the sealing sleeve to form a spiral flow channel during valve core movement. This actively pushes solid particles and fibrous impurities in the medium to the slag discharge hole, and then discharges them from the valve cavity through the annular drain chamber and the one-way drain valve. This avoids the accumulation of impurities in the gap between the valve core and the sealing sleeve, further eliminating the risk of jamming caused by impurities, improving the smoothness of the control valve's operation, reducing wear and tear on components, and effectively extending the service life of the linear control valve. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a linear regulating valve for preventing jamming, as proposed in this utility model. Figure 2 This is a cross-sectional view of a linear regulating valve designed to prevent jamming, as proposed in this utility model. Figure 3 A schematic diagram of the connection structure between the valve stem and the elastic guide seal of a linear regulating valve for preventing jamming, as proposed in this utility model; Figure 4 This utility model proposes an anti-jamming linear regulating valve. Figure 3 A magnified structural diagram of point A.

[0014] In the picture: 1. Regulating valve body; 2. Flow passage; 201. Valve cavity; 3. Valve stem; 301. Elastic guide seal; 302. Metal pre-tightening cone ring; 303. Spring washer; 304. Disc spring; 4. L-shaped lubrication passage; 401. Lubrication cavity; 402. Annular lubrication groove; 5. Valve cover; 501. Sealing bushing; 502. Valve core; 503. Connecting spring; 6. Helical rib; 601. Annular drain cavity; 602. Drain pipe; 603. One-way drain valve; 7. Input port; 8. Output port. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0017] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0018] Example: Reference Figures 1-4 A linear regulating valve for preventing jamming includes a regulating valve body 1. The regulating valve body 1 has a flow channel 2 and a valve cavity 201 respectively. The flow channel 2 and the valve cavity 201 are connected. A valve stem 3 is provided on the contact surface between the flow channel 2 and the valve cavity 201. A conical elastic guide seal 301 is sleeved on the outer surface of the middle guide section of the valve stem 3. The inner ring of the elastic guide seal 301 is interference-fitted with the valve stem 3. A metal preloaded cone ring 302 is fitted on the outer surface of the elastic guide seal 301. The inner ring of the metal preloaded cone ring 302 is in contact with the outer cone surface of the elastic guide seal 301. Spring washers 303 are evenly distributed circumferentially on one side of the metal preloaded cone ring 302. A disc spring 304 is fixedly connected to the spring washers 303. One end of the disc spring 304 is connected and fixed to the side of the valve cavity 201 near the flow channel 2.

[0019] The outer wall of the elastic guide seal 301 is uniformly provided with L-shaped lubrication holes on one side, and L-shaped lubrication channels 4 are provided inside the L-shaped lubrication holes. The outer surface of the metal pre-tightening cone ring 302 is provided with a lubrication cavity 401. The valve stem 3 has an annular lubrication groove 402 on the outer wall side near the elastic guide seal 301. One end of the L-shaped lubrication channel 4 extends into the interior of the lubrication cavity 401 and communicates with the lubrication cavity 401, while the other end extends into the annular lubrication groove 402. The interior of the lubrication cavity 401 is filled with grease.

[0020] A valve cover 5 is fixedly connected to one side of the outer wall of the regulating valve body 1. A sealing bushing 501 is fixedly connected to the inner contact surface between the valve cover 5 and the regulating valve body 1. A valve core 502 is sleeved inside the sealing bushing 501. The valve core 502 is connected to the valve stem 3 by a connecting spring 503.

[0021] The outer surface of the valve core 502 is fixedly connected with a spiral protrusion 6, and the inside of the sealing sleeve 501 is provided with a spiral groove that matches the spiral protrusion 6. The depth of the spiral groove is greater than the height of the spiral protrusion 6.

[0022] The bottom of the spiral groove is evenly provided with several slag discharge holes, and the outer surface of the sealing bushing 501 is provided with an annular sewage discharge chamber 601, and the slag discharge holes are connected to the interior of the annular sewage discharge chamber 601. The bottom of the annular drain chamber 601 is fixedly connected to a drain pipe 602. A circular hole is opened on the bottom outer wall of the valve cover 5. The bottom of the drain pipe 602 passes through the circular hole and extends to the outside of the valve cover 5. A one-way drain valve 603 is provided at the bottom end of the drain pipe 602.

[0023] The top of the regulating valve body 1 is provided with an input port 7, which is connected to the interior of the flow channel 2. The bottom of the regulating valve body 1 is provided with an output port 8, which is connected to the interior of the valve cavity 201.

[0024] In this embodiment, when the regulating valve body 1 is used, the medium first enters from the input port 7 through the input end of the flow channel 2 and flows into the valve cavity 201. At this time, the valve core 502 is in the initial position, and a basic flow gap is maintained between the valve core 502 and the valve cavity 201. The medium can initially flow to the output port 8 through this flow gap. When the external actuator is connected to the valve stem 3, an axial driving force is applied to the valve stem 3. When the actuator pushes the valve stem 3 to move linearly, the valve stem 3 moves synchronously with the valve core 502 through the connecting spring 503. At this time, the connecting spring 503 is compressed. When the valve core 502 changes its axial position along the inner wall of the valve cavity 201, the flow area of ​​the valve core 502 on the inner wall of the valve cavity 201 is changed, thereby regulating the medium flow rate.

[0025] Specifically, when the external actuator drives the valve stem 3 to move the valve core 502, if the valve stem 3 deviates due to thermal deformation or uneven wear during movement, the original fit between the valve stem 3 and the elastic guide seal 301 and the metal preload cone ring 302 is broken. At this time, the preload force of the disc spring 304 on the metal preload cone ring 302 immediately pushes the metal preload cone ring 302 to move in the direction of "filling the gap or correcting the deviation". Since the inner cone surface of the metal preload cone ring 302 always maintains an oblique fit with the outer cone surface of the elastic guide seal 301, the axial thrust of the metal preload cone ring 302 will be converted into a radial clamping force, which will squeeze the elastic guide seal 301. After the elastic guide seal 301 is squeezed, it will deform in the direction of the valve stem 3, thereby filling the gap between the valve stem 3 and the elastic guide seal 301 and compensating for the deviation of the valve stem 3, so that the valve stem 3 refits the central axis of the elastic guide seal 301, ensuring that the valve stem 3 can move along the axis. Meanwhile, the grease in the lubrication cavity 401 continuously permeates into the annular lubrication groove 402 through the L-shaped lubrication channel 4, thereby forming a lubricating film between the contact surfaces of the valve stem 3 and the elastic guide seal 301, which reduces frictional resistance and prevents jamming.

[0026] Furthermore, when the valve stem 3 pushes the valve core 502 to move along the axis to adjust the flow rate, as the valve core 502 moves, the relative movement of the spiral protrusion 6 on its surface and the spiral groove inside the sealing sleeve 501 forms a spiral flow channel. At this time, solid particles, fibrous impurities, etc. mixed in the flowing medium are pushed by the spiral direction of the spiral protrusion 6 to the slag discharge hole at the bottom of the spiral groove. Subsequently, the impurities fall into the annular drain chamber 601 through the slag discharge hole. At this time, by opening the one-way drain valve 603, the impurities inside the annular drain chamber 601 are discharged to the outside of the valve cavity 201 along with a small amount of medium through the drain pipe 602, avoiding the accumulation of impurities in the gap between the valve core 502 and the sealing sleeve 501, further solving the problem of valve core 502 jamming and improving the smoothness of the operation of the regulating valve body 1.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", 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 are not intended to indicate or imply that the device or component 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.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A linear regulating valve with anti-jamming capability, comprising a regulating valve body (1), characterized in that, The regulating valve body (1) is provided with a flow channel (2) and a valve cavity (201) respectively. The flow channel (2) and the valve cavity (201) are connected. A valve stem (3) is provided on the contact surface between the flow channel (2) and the valve cavity (201). A conical elastic guide seal (301) is sleeved on the outer surface of the middle guide section of the valve stem (3). The inner ring of the elastic guide seal (301) is interference-fitted with the valve stem (3). The outer surface of the elastic guide seal (301) is fitted with a metal pre-tightening cone ring (302). The inner ring of the metal pre-tightening cone ring (302) is in contact with the outer cone surface of the elastic guide seal (301). Spring washers (303) are evenly distributed circumferentially on one side of the metal pre-tightening cone ring (302). A disc spring (304) is fixedly connected to the spring washer (303). One end of the disc spring (304) is connected and fixed to the side of the valve cavity (201) near the flow channel (2).

2. The anti-jamming linear regulating valve according to claim 1, characterized in that, The elastic guide seal (301) has L-shaped lubrication holes evenly opened on one side of its outer wall, and L-shaped lubrication channels (4) are provided in the L-shaped lubrication holes. The outer surface of the metal pre-tightening cone ring (302) is provided with a lubrication cavity (401). The valve stem (3) has an annular lubrication groove (402) on the outer wall side near the elastic guide seal (301). One end of the L-shaped lubrication channel (4) extends into the interior of the lubrication cavity (401) and communicates with the lubrication cavity (401), while the other end extends into the annular lubrication groove (402). The interior of the lubrication cavity (401) is filled with grease.

3. The anti-jamming linear regulating valve according to claim 1, characterized in that, A valve cover (5) is fixedly connected to one side of the outer wall of the regulating valve body (1). A sealing bushing (501) is fixedly connected to the inner contact surface of the valve cover (5) and the regulating valve body (1). A valve core (502) is sleeved inside the sealing bushing (501). The valve core (502) is connected to the valve stem (3) by a connecting spring (503).

4. The anti-jamming linear regulating valve according to claim 3, characterized in that, The outer surface of the valve core (502) is fixedly connected with a spiral protrusion (6), and the inside of the sealing bushing (501) is provided with a spiral groove that matches the spiral protrusion (6), and the depth of the spiral groove is greater than the height of the spiral protrusion (6).

5. The anti-jamming linear regulating valve according to claim 4, characterized in that, The bottom of the spiral groove is uniformly provided with several slag discharge holes, and the outer surface of the sealing bushing (501) is provided with an annular sewage discharge chamber (601). The slag discharge holes are connected to the interior of the annular sewage discharge chamber (601). The bottom of the annular drain chamber (601) is fixedly connected to a drain pipe (602). A circular hole is opened on the bottom outer wall of the valve cover (5). The bottom of the drain pipe (602) passes through the circular hole and extends to the outside of the valve cover (5). A one-way drain valve (603) is provided at the bottom end of the drain pipe (602).

6. The anti-jamming linear regulating valve according to claim 1, characterized in that, The top of the regulating valve body (1) is provided with an input port (7), which is connected to the interior of the flow channel (2). The bottom of the regulating valve body (1) is provided with an output port (8), which is connected to the interior of the valve cavity (201).

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