Track type micro flow regulating valve

Abstract

The invention provides a rail type micro flow regulating valve which comprises a valve body, a valve rod and a valve rod. The valve seat partitions the medium channels and is provided with a plurality of holes communicated with the medium channels on the two sides of the valve seat; an adjusting unit which is installed on the valve body and can output power; the valve clack is provided with a closed end face tightly attached to the hole face of the valve seat, and the closed end face can be driven by power output by the adjusting unit to move relative to the hole area so as to close or open the hole area. Contact between the valve seat and the valve plug is achieved in a pressing fit mode, and medium throttling is achieved by shielding the area of the throttling hole of the valve seat in the rotating process of the valve plug. High medium adjusting precision is achieved through multi-hole shielding throttling, meanwhile, in the using process, the area of the throttling hole is not changed, a gap between the valve plug and the valve seat is not changed, and the adjusting precision of the adjusting valve in the long-term using process can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to a track-type micro-flow regulating valve. Background Technology

[0002] Conventional control valves regulate flow rate through the flow area between the valve seat and valve disc (single-seat type) and the throttling area of ​​the window between the valve plug and sleeve (sleeve type). When the flow rate regulation accuracy of the control valve is very high, precise control of the flow area is required. Single-seat structures require strict control of the valve seat and valve body dimensions; even slight deviations in the valve seat machining dimensions will result in the control valve failing to meet the required regulation accuracy. Sleeve-type structures require precise control of the gap between the valve plug and sleeve (to reduce the impact of gap flow on the flow rate). In other words, regulating flow rate by controlling the throttling window area is highly susceptible to machining accuracy, making flow rate accuracy control during the opening process difficult. For example, a machining error of ±0.05mm in a 25mm valve seat diameter can result in a ±1.6% total area deviation, and this variation has an even greater impact when the annular flow area is small.

[0003] Furthermore, with increased usage time, the valve seat sealing surface may experience further wear and dimensional changes due to compression or erosion, leading to a continuous decline in the regulating accuracy of the control valve after a period of use. This decline is particularly pronounced in small flow control valves, making it impossible to meet the required flow regulation accuracy. Although sleeve-type control valves do not experience flow changes due to wear caused by sealing surface movement, the clearance between the sleeve and the valve plug determines the regulating performance at small openings. Theoretically, reducing the clearance between the valve plug and the sleeve can reduce the small flow regulation deviation caused by the clearance, but excessively small deviations may lead to problems such as jamming during valve operation. These issues make the manufacturing of small flow channel control valves difficult and prone to a continuous decline in regulating accuracy during use. Summary of the Invention

[0004] This invention provides a track-type micro-flow regulating valve to solve the technical problem that existing regulating valves adjust flow by controlling the area of ​​the throttling window, which is greatly affected by the machining accuracy and makes it difficult to control the flow accuracy during the opening process.

[0005] The present invention provides a track-type micro-flow regulating valve, comprising: The valve body has an internal medium passage. A valve seat is installed in the valve body and isolates the medium channel. The valve seat has a perforated area with several holes that connect the medium channels on both sides of the valve seat. The surface of the valve seat facing the medium channels on both sides is a plane. An adjustment unit, installed in the valve body, is capable of outputting power; A valve disc is located within the medium channel and connected to the power output end of the regulating unit. The valve disc has a flat closed end face. The regulating unit limits the valve disc so that the closed end face is in close contact with one of the surfaces of the valve seat facing the medium channel. The valve disc can move relative to the orifice area under the power output by the regulating unit so that the closed end face closes or opens the orifice area.

[0006] In one embodiment of the present invention, the regulating unit includes a valve cover, a linear power component, and a valve stem. The valve cover is connected to the valve body, the linear power component is connected to the valve cover, and the linear power component outputs linear power. One end of the valve stem is connected to the linear power component, and the other end of the valve stem is connected to the valve disc. Under the drive of the linear power, the valve stem drives the closed end of the valve disc to close or open the orifice area.

[0007] In one embodiment of the present invention, the valve disc has a rectangular through hole, the valve stem has a helical section, the cross-sectional profile of the helical section is a rectangle that is in clearance fit with the rectangular through hole, the helical section is in clearance fit with the rectangular through hole, and the valve stem drives the valve disc to rotate under the linear power drive, so that the closed end face closes or opens the hole area.

[0008] In one embodiment of the present invention, the valve disc includes a valve disc body, and a valve disc block is connected to the end of the valve disc body facing the valve seat. The end face of the valve disc block facing the valve seat serves as the closed end face, and the area of ​​the closed end face is smaller than the cross-sectional area of ​​the valve disc body, so that a first opening communicating with the medium channel is formed between the valve disc body and the valve disc block.

[0009] In one embodiment of the present invention, a sleeve is provided in the medium channel, one end of the sleeve is connected to the valve cover, the other end of the sleeve is pressed against the valve seat, the valve disc is located inside the sleeve, the valve disc body is a cylinder that is clearance-fitted into the sleeve, and a second opening is provided on the side wall of the sleeve, the second opening connecting the medium channel and the first opening.

[0010] In one embodiment of the present invention, an elastic element is provided between the end of the valve disc body away from the valve seat and the valve cover, and a planar thrust bearing is provided between the elastic element and the valve disc body. One end of the elastic element abuts against the valve cover, the other end of the elastic element abuts against the stationary ring of the planar thrust bearing, and the moving ring of the planar thrust bearing abuts against the valve disc body.

[0011] In one embodiment of the present invention, the hole area is fan-shaped, the valve disc block is a fan-shaped block integrally formed on the valve disc body, and the contour of the closed end face is a fan-shaped shape with a size larger than that of the hole area.

[0012] In one embodiment of the present invention, the linear power component is connected to a bracket, the bracket is connected to the end cap, the bracket is connected to a scale, the scale is provided with graduations in the direction of linear power output, the output end of the linear power component is clamped and connected to the valve stem by a clamping block, and the clamping block is provided with a pointer pointing to the graduations.

[0013] In one embodiment of the present invention, the valve stem passes through the valve cover and is connected to the valve disc, and a packing assembly is provided between the valve stem and the valve cover.

[0014] In one embodiment of the present invention, the diameter of the holes in the hole area is 0.5-2mm.

[0015] The beneficial effects of this invention are as follows: This invention proposes a track-type micro-flow regulating valve where the valve seat and valve disc achieve contact through a planar fit. The valve seat employs a partially porous structure as a medium throttling channel. The valve disc, driven by an adjustment unit, blocks and seals the orifices in the orifice area. By controlling the movement of the valve disc, the sealing area of ​​the orifice area on the valve seat is adjusted, thus achieving medium throttling regulation through adjustment of the sealed area. This invention uses multi-hole sealing throttling to achieve high-precision regulation of the medium flow rate. During use, the area of ​​the throttling orifice remains unchanged, and the valve disc and valve seat maintain surface contact with no change in the contact gap. Even if the medium is washed away, it will not affect the overall contact between the sealed end face and the valve seat surface, nor will it affect the medium flow area. This ensures the regulating valve's adjustment accuracy during long-term use, making flow rate control easier. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the structure of a track-type micro-flow regulating valve according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a track-type micro-flow regulating valve provided in one embodiment of the present invention; Figure 3 This is a schematic diagram showing the connection relationship between the valve disc, valve seat, and valve stem according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the valve disc structure provided in one embodiment of the present invention; Figure 5This is a schematic diagram of the valve seat provided in one embodiment of the present invention; Figure 6 This is a schematic diagram of the sleeve provided in one embodiment of the present invention.

[0018] The attached figures are labeled as follows: Valve body 1, valve seat 2, orifice area 201, sleeve 3, second opening 301, valve disc 4, valve disc body 401, valve disc block 402, rectangular through hole 403, first opening 404, closed end face 405, planar thrust bearing 5, elastic element 6, packing assembly 7, valve stem 8, spiral section 801, linear power element 9, clamping block 10, bracket 11, valve cover 12, scale 13, pointer 14. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] Please see Figure 1 , Figure 2 , Figure 1 , Figure 2 An embodiment of the present invention provides a track-type micro-flow regulating valve, comprising: Valve body 1 has a media channel inside; Valve seat 2, installed inside valve body 1, isolates the medium passage, combined with Figure 5 As shown, the valve seat 2 is provided with a hole area 201, and the hole area 201 has several holes that connect the medium channels on both sides of the valve seat 2. The surface of the valve seat 2 facing the medium channels on both sides is a plane. The regulating unit, installed on valve body 1, is capable of outputting power; Valve disc 4 is located in the medium channel and connected to the power output end of the regulating unit. Valve disc 4 has a flat closed end face 405. The regulating unit limits the valve disc 4 so that the closed end face 405 is in close contact with one of the surfaces of the valve seat 2 facing the medium channel. Under the power output by the regulating unit, valve disc 4 can move relative to the orifice area 201 so that the closed end face 405 closes or opens the orifice area 201.

[0023] In this embodiment, a gasket is installed between the valve seat 2 and the valve body 1 to ensure a seal between them. In this embodiment, both the closed end face 405 of the valve disc 4 and the surface of the valve seat 2 are overlaid with hard alloy and polished by grinding, achieving a mirror-like surface roughness. The valve seat 2 and valve disc 4 achieve a seal through planar contact. The valve seat 2 uses the holes in the orifice area 201 as a medium throttling channel. Under the limiting position of the regulating unit, the valve disc 4 and valve seat 2 are in close planar contact. The regulating unit can also cause the valve disc 4 to block and close the holes in the orifice area 201, thereby achieving regulation and control of the medium flow rate. This allows for high-precision regulation of the medium flow rate by adjusting the closed area of ​​the orifice area 201, making flow rate control easier. Furthermore, changes in the orifice size caused by the scouring of the orifice by the medium do not affect the adjustment of the closed area of ​​the orifice area 201 by the valve disc 4, ensuring that the flow rate regulation accuracy does not decrease with increasing usage time, thus guaranteeing the regulation accuracy of the control valve during long-term use.

[0024] For example, in this embodiment, the regulating unit includes a valve cover 12, a linear power component 9, and a valve stem 8. The valve cover 12 is connected to the valve body 1, the linear power component 9 is connected to the valve cover 12, the linear power component 9 outputs linear power, one end of the valve stem 8 is connected to the linear power component 9, and the other end of the valve stem 8 is connected to the valve disc 4. Under the drive of the linear power, the valve stem 8 drives the closed end face 405 of the valve disc 4 to close or open the orifice area 201.

[0025] In this embodiment, the valve cover 12 is bolted to the valve body 1. The valve cover 12 serves as a support structure for the linear power component 9 and the valve stem 8. The linear power component 9 is bolted to the valve cover 12. The linear power component 9 is a cylinder. Linear power is output through the linear power component 9 and transmitted through the valve stem 8 to drive the valve disc 4 to move.

[0026] For example, in this embodiment, such as Figure 3 , Figure 4As shown, the valve disc 4 has a rectangular through hole 403, and the valve stem 8 has a helical section 801. The cross-sectional profile of the helical section 801 is a rectangle that is in clearance fit with the rectangular through hole 403. The helical section 801 is in clearance fit with the rectangular through hole 403. Under the linear power drive, the valve stem 8 drives the valve disc 4 to rotate, so that the closed end face 405 closes or opens the hole area 201.

[0027] In this embodiment, the valve stem 8 is inserted into the rectangular through hole 403 of the valve disc 4 under the action of linear power. Through the clearance fit between the helical segment 801 and the rectangular through hole 403, the helical segment 801 of the valve stem 8 and the rectangular through hole 403 of the valve disc 4 cooperate to form a track guide structure. During the linear movement of the valve stem 8, the linear motion is converted into rotational motion, which drives the valve disc 4 to rotate, thereby realizing the closure or opening of the orifice area 201 by the closed end face 405 of the valve disc 4. The linear power input has a more stable mechanical transmission structure, while the rotational motion output is converted into rotational motion through the helical track structure. The closed area of ​​the orifice area 201 is controlled by the rotation angle, which has higher adjustment accuracy.

[0028] For example, in this embodiment, such as Figure 4 As shown, the valve disc 4 includes a valve disc body 401. A valve disc block 402 is connected to the end of the valve disc body 401 facing the valve seat 2. The end face of the valve disc block 402 facing the valve seat 2 serves as a closed end face 405. The area of ​​the closed end face 405 is smaller than the cross-sectional area of ​​the valve disc body 401, forming a first opening 404 between the valve disc body 401 and the valve disc block 402 that communicates with the medium channel. In this embodiment, the valve disc block 402 is integrally formed into the valve disc body 401, resulting in better overall integrity of the valve disc 4. The first opening 404 ensures smooth flow of the medium.

[0029] For example, in this embodiment, a sleeve 3 is provided inside the medium channel. One end of the sleeve 3 is connected to the valve cover 12, and the other end of the sleeve 3 is pressed tightly against the valve seat 2. The valve disc 4 is located inside the sleeve 3, and the valve disc body 401 is a cylinder that fits with the sleeve 3 with clearance. Figure 6 As shown, the sleeve 3 has a second opening 301 on its side wall, which connects the medium channel and the first opening 404. In this embodiment, the sleeve 3, valve seat 2, and gasket are sequentially pressed together by the valve cover 12. The sleeve 3 acts as a lateral limiter for the valve disc 4. The sleeve 3, valve disc body 401, and valve stem 8 are coaxially arranged to ensure that the valve stem 8 drives the valve disc 4 to rotate in place. The second opening 301 ensures that the medium can flow through the sleeve 3 and then enter the medium channel on the other side of the valve seat 2 through the hole area 201.

[0030] For example, in this embodiment, an elastic element 6 is provided between the end of the valve disc body 401 away from the valve seat 2 and the valve cover 12. A planar thrust bearing 5 is provided between the elastic element 6 and the valve disc body 401. One end of the elastic element 6 abuts against the valve cover 12, and the other end of the elastic element 6 abuts against the stationary ring of the planar thrust bearing 5. The moving ring of the planar thrust bearing 5 abuts against the valve disc body 401.

[0031] In this embodiment, the elastic element 6 is a spring. The elastic element 6 presses the valve disc body 401 against the valve seat 2. The planar thrust bearing 5 provides relative rotational freedom between the elastic element 6 and the valve disc body 401, preventing the rotational force generated during the rotation of the valve disc 4 from being transmitted to the elastic element 6, thus preventing the elastic element 6 from rotating along with the valve disc 4. By continuously applying a pressing force to the valve seat 2 through the elastic element 6, the closed end face 405 of the valve disc 4 remains in close contact with the surface of the valve seat 2, thereby ensuring the sealing between the valve disc 4 and the valve seat 2 during long-term use. This ensures that the gap between the valve plug and the valve seat 2 does not change, guaranteeing the adjustment accuracy of the regulating valve during long-term use.

[0032] For example, in this embodiment, the hole area 201 is fan-shaped, the valve disc block 402 is a fan-shaped block integrally formed on the valve disc body 401, and the outline of the closed end face 405 is a fan-shaped shape with a size larger than that of the hole area 201.

[0033] In this embodiment, the valve disc 4 rotates under the drive of the valve stem 8. By using a fan-shaped orifice area 201 and a closed end face 405, the closed area of ​​the orifice area 201 changes more uniformly and stably during the rotation of the valve disc 4, making the regulation of the medium flow rate more stable and the regulation accuracy higher.

[0034] For example, in this embodiment, the linear power component 9 is bolted to a bracket 11, which is bolted to an end cap. A scale 13 is bolted to the bracket 11, and the scale 13 has graduations in the linear power output direction. The output end of the linear power component 9 is connected to the valve stem 8 by a clamping block 10 with bolts. A pointer 14 pointing to the graduations is welded to the clamping block 10. In this embodiment, the pointer 14 and the scale 13 facilitate observation of the linear displacement of the valve stem 8, thereby calculating the rotation angle of the valve disc 4 and obtaining the adjustment of the medium flow rate.

[0035] For example, in this embodiment, the valve stem 8 passes through the valve cover 12 and connects to the valve disc 4, and a packing assembly 7 is provided between the valve stem 8 and the valve cover 12. The packing assembly 7 ensures the sealing between the valve stem 8 and the valve cover 12. The packing assembly 7 specifically adopts existing technology, which will not be described in detail here.

[0036] For example, in this embodiment, the diameter of the holes in the hole region 201 is 0.5-2 mm. Using holes with a diameter of 0.5-2 mm is beneficial to improving the adjustment accuracy of the medium flow rate and to achieving adjustment within a small flow range.

[0037] In practical application of this invention, as an example, the valve diameter is DN25, the valve seat 2 is made of plate, and the orifice area 201 has several through holes with a diameter of 0.5-2mm. The fan-shaped distribution of the holes meets the requirements of the flow meter adjustment curve. In the closed state, the closed end face 405 of the valve disc 4 completely seals the orifice area 201 of the valve seat 2. Under the action of the elastic element 6, the contact surface between the valve disc 4 and the valve seat 2 is tightly sealed, and all the holes in the orifice area 201 are blocked, realizing the cutting off of the medium. Under working conditions, the medium enters the sleeve 3 from the medium channel and the second opening 301, and enters the space between the valve disc 401 and the valve cover 12 through the gap between the sleeve 3 and the valve disc body 401. The medium pressure acts on the valve disc body 401, so that the valve disc body 401 is subjected to a force towards the valve seat 2. Combined with the force of the elastic element 6 on the valve disc 4, the self-sealing of the contact surface between the valve disc 4 and the valve seat 2 is achieved.

[0038] Upon receiving the opening command, the linear power component 9 outputs linear power to the valve stem 8, causing the valve stem 8 to move downward. The helical segment 801 at the bottom of the valve stem 8 drives the valve disc 4 to rotate. By controlling the linear displacement of the valve stem 8, the valve stem 8 drives the valve disc 4 to rotate to the target angle, thereby causing the closed end face 405 to rotate relative to the orifice area 201. During the rotation, the orifice area 201 is gradually opened, and the medium flows out of the valve body 1 through the orifice, the first opening 404, and the second opening 301, thereby achieving the regulation of the medium flow rate.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A track-type micro-flow regulating valve, characterized in that, include: The valve body has an internal medium passage. A valve seat is installed in the valve body and isolates the medium channel. The valve seat has a perforated area with several holes that connect the medium channels on both sides of the valve seat. The surface of the valve seat facing the medium channels on both sides is a plane. An adjustment unit, installed in the valve body, is capable of outputting power; A valve disc is located within the medium channel and connected to the power output end of the regulating unit. The valve disc has a flat closed end face. The regulating unit limits the valve disc so that the closed end face is in close contact with one of the surfaces of the valve seat facing the medium channel. The valve disc can move relative to the orifice area under the power output by the regulating unit so that the closed end face closes or opens the orifice area.

2. The track-type micro-flow regulating valve according to claim 1, characterized in that: The regulating unit includes a valve cover, a linear power component, and a valve stem. The valve cover is connected to the valve body, and the linear power component is connected to the valve cover. The linear power component outputs linear power. One end of the valve stem is connected to the linear power component, and the other end of the valve stem is connected to the valve disc. Driven by the linear power, the valve stem drives the closed end of the valve disc to close or open the orifice area.

3. The track-type micro-flow regulating valve according to claim 2, characterized in that: The valve disc has a rectangular through hole, and the valve stem has a helical section. The cross-sectional profile of the helical section is a rectangle that is in clearance fit with the rectangular through hole. The valve stem drives the valve disc to rotate under the linear power drive, so that the closed end face closes or opens the hole area.

4. The track-type micro-flow regulating valve according to claim 3, characterized in that: The valve disc includes a valve disc body, and a valve disc block is connected to the end of the valve disc body facing the valve seat. The end face of the valve disc block facing the valve seat serves as the closed end face. The area of ​​the closed end face is smaller than the cross-sectional area of ​​the valve disc body, so that a first opening communicating with the medium channel is formed between the valve disc body and the valve disc block.

5. A track-type micro-flow regulating valve according to claim 4, characterized in that: A sleeve is provided inside the medium channel. One end of the sleeve is connected to the valve cover, and the other end of the sleeve is pressed against the valve seat. The valve disc is located inside the sleeve. The valve disc body is a cylinder that fits the sleeve with clearance. A second opening is provided on the side wall of the sleeve. The second opening connects the medium channel with the first opening.

6. The track-type micro-flow regulating valve according to claim 4, characterized in that: An elastic element is provided between the end of the valve disc body away from the valve seat and the valve cover. A planar thrust bearing is provided between the elastic element and the valve disc body. One end of the elastic element abuts against the valve cover, and the other end of the elastic element abuts against the stationary ring of the planar thrust bearing. The moving ring of the planar thrust bearing abuts against the valve disc body.

7. A track-type micro-flow regulating valve according to claim 4, characterized in that: The perforated area is fan-shaped, the valve disc block is a fan-shaped block integrally formed on the valve disc body, and the outline of the closed end face is a fan-shaped shape with a size larger than that of the perforated area.

8. A track-type micro-flow regulating valve according to claim 2, characterized in that: The linear power component is connected to a bracket, which is connected to the end cap. The bracket is connected to a scale, which has graduations in the direction of linear power output. The output end of the linear power component is clamped and connected to the valve stem by a clamping block, which has a pointer pointing to the graduations.

9. A track-type micro-flow regulating valve according to claim 8, characterized in that: The valve stem passes through the valve cover and connects to the valve disc, and a packing assembly is provided between the valve stem and the valve cover.

10. A track-type micro-flow regulating valve according to claim 1, characterized in that: The diameter of the holes in the perforated area is 0.5-2mm.

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