A precision control valve with an online adjustable labyrinth

Abstract

The utility model relates to the precise control valve of online adjustment labyrinth, including the valve body, and opening the flow passage, the core axle, and the valve body of sliding cooperation, along the sliding direction of core axle sliding core axle, and core axle extends into or away from flow passage, and the flow area of flow passage is changed, the labyrinth adjustment body, and extend into flow passage, and the protrusion of the end extension of labyrinth adjustment body near flow passage is set up, the outer diameter of protrusion < the outer diameter of labyrinth adjustment body, wherein, the recessed setting step of flow passage cooperates protrusion, the clearance between flow passage and step is tortuous, and the medium flowing along flow passage, and the clearance is flowed through, the utility model discloses the protrusion on the labyrinth adjustment body and the step cooperation in flow passage, form the clearance of meandering and tortuous, and the flow of control valve is doubly adjusted and controlled with the position of valve core.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology, and in particular to a precision control valve with an online adjustable labyrinth. Background Technology

[0002] A control valve is a throttling element with variable local resistance. When fluid flows through the control valve, the local reduction in flow area caused by the valve core and valve seat creates local resistance, which causes changes in the pressure and velocity of the fluid.

[0003] In high-pressure, low-flow-rate operating conditions, such as those in the oil, natural gas, coal chemical, thermal power, and fine chemical industries, the operating conditions are extremely complex, leading to the widespread application of micro-flow control valves. Traditional micro-flow control valves require high precision in machining and assembly, and suffer from problems such as large leakage, poor adjustability, and even inability to adjust and control.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a precision control valve with an online adjustable labyrinth, so as to improve the regulating performance of the precision control valve.

[0006] The technical solution of this utility model is as follows:

[0007] The precision control valve that allows for online adjustment of the labyrinth includes:

[0008] Valve body, with flow channels;

[0009] The mandrel is slidably fitted to the valve body; the mandrel slides along the sliding direction of the mandrel, extending into or away from the flow channel, thereby changing the flow area of ​​the flow channel;

[0010] A labyrinth adjuster extends into the flow channel; a protrusion extends from the end of the labyrinth adjuster near the end of the flow channel; the outer diameter of the protrusion is less than the outer diameter of the labyrinth adjuster.

[0011] The flow channel has a recessed step that complements the protrusion; the gap between the flow channel and the step is tortuous; the medium flowing along the flow channel flows through the gap.

[0012] A further technical solution is that the protrusions are stacked in at least two layers; the outer diameter of the protrusions near the maze adjuster is greater than the outer diameter of the protrusions away from the maze adjuster; correspondingly, the steps are also set in at least two layers.

[0013] A further technical solution is that the labyrinth adjuster and the protrusion are rotating bodies; the labyrinth adjuster is threadedly connected to the valve body.

[0014] A further technical solution is that a sealing ring is provided inside the valve body; the labyrinth adjuster extends into the flow channel after passing through the sealing ring.

[0015] A further technical solution is that the mandrel includes a valve stem and a valve core near the flow channel; the diameter of the valve stem is larger than the diameter of the valve core; an inclined surface is provided on the valve core; the inclined surface is set at an angle to the axis of the valve core.

[0016] A further technical solution is that a drive chamber is also provided in the valve body; the spindle passes through the drive chamber and is fitted with a piston; the piston separates the drive chamber; the drive chamber on one side of the piston is connected to the first oil passage, and the drive chamber on the other side of the piston is connected to the second oil passage.

[0017] A further technical solution is that a valve seat is provided inside the flow channel; the valve seat is sleeved on the mandrel that extends into the flow channel; and a lip is provided on the surface of the mandrel surrounding the valve seat.

[0018] A further technical solution is that a valve cover is provided between the drive chamber and the flow channel; the valve cover isolates the drive chamber and the flow channel; the diameter of the flow channel near the valve cover is increased to form an expansion section; and the valve seat is disposed within the expansion section.

[0019] A further technical solution is that a pressure sleeve is provided between the valve seat and the valve cover; the pressure sleeve is a cylindrical body and is arranged around the mandrel; a through hole is opened on the pressure sleeve to connect the inner and outer surfaces of the pressure sleeve.

[0020] A further technical solution is that the end of the mandrel away from the flow channel extends out of the valve body, and a scale is set along the axial direction of the mandrel.

[0021] The beneficial technical effects of this utility model are as follows:

[0022] (1) The precision control valve with an online adjustable labyrinth in this utility model has a valve body that slides with a spindle. The position of the sliding spindle changes the flow area of ​​the flow channel, thereby changing the pressure and velocity of the fluid passing through the valve body. Simultaneously, a labyrinth adjusting body is provided on the valve body. The protrusions on the labyrinth adjusting body cooperate with the steps in the flow channel to form a meandering gap. Without adjusting the position of the valve core, the smaller the gap between the protrusions and the steps, the smaller the flow rate of the medium flowing through the valve body. The position of the labyrinth adjusting body is not affected by the hydraulic oil and can be precisely adjusted manually, reducing the number of parts and lowering the requirements for machining accuracy. Manual adjustment of the labyrinth adjusting body position makes the flow rate adjustment of the control valve more intuitive. At the same time, the cooperation between the valve core and the labyrinth adjusting body allows the valve body to be adjusted to a smaller flow rate, increasing the adjustment range of the control valve.

[0023] (2) Furthermore, multiple layers of protrusions and steps can be provided. The combination of multiple layers of protrusions and steps results in more bends in the gap between the protrusions and steps. The gap is more meandering and tortuous, which increases the resistance encountered by the medium when passing through the gap, so as to achieve a smaller flow rate.

[0024] (3) Further, the labyrinth adjuster is threadedly connected to the valve body. By rotating the labyrinth adjuster, the position of the labyrinth adjuster relative to the flow channel can be precisely adjusted to adjust the width of the gap between the protrusion and the step, thereby precisely adjusting the flow rate of the control valve. Attached Figure Description

[0025] Figure 1 A vertical cross-sectional view of a precision control valve with an online adjustable labyrinth, according to an embodiment of the present disclosure, is shown.

[0026] Figure 2 A partial enlarged view of point A is shown of a precision control valve with an online adjustable labyrinth according to an embodiment of the present disclosure.

[0027] Figure 3 A vertical cross-sectional view of a precision control valve with an online adjustable labyrinth, according to an embodiment of the present disclosure, is shown.

[0028] Figure 4 A vertical cross-sectional view of a precision control valve with an online adjustable labyrinth, according to an embodiment of the present disclosure, is shown.

[0029] Marked in the attached diagram:

[0030] 1. Valve body; 11. Valve seat; 111. Lip; 112. Sealing gasket; 12. Pressure sleeve; 121. Through hole; 13. First oil passage; 14. Drive chamber; 15. Flow channel; 151. Expansion section; 152. Step; 2. Valve cover; 21. Second oil passage; 3. Cover plate; 4. Labyrinth adjuster; 41. Protrusion; 42. Clearance; 5. Spindle; 51. Valve stem; 511. Shoulder; 512. Scale; 52. Valve core; 521. Bevel; 53. Retaining ring; 6. Piston; 7. Indicator sleeve. Detailed Implementation

[0031] To make the objectives, features, and advantages of this utility model more apparent and understandable, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0032] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0033] Figure 1 A vertical cross-sectional view of a precision control valve with an online adjustable labyrinth, according to an embodiment of the present disclosure, is shown. Figure 2 A partial enlarged view of point A is shown of a precision control valve with an online adjustable labyrinth according to an embodiment of the present disclosure. Figure 3 A vertical cross-sectional view of a precision control valve with an online adjustable labyrinth, according to an embodiment of the present disclosure, is shown. Figure 4 A vertical cross-sectional view of a precision control valve with an online adjustable labyrinth, according to an embodiment of this disclosure, is shown in the diagram under large opening conditions. Please refer to... Figure 1 , Figure 2 , Figure 3 and Figure 4A precision control valve with an online adjustable labyrinth includes a valve body 1 with a flow channel 15. The medium flowing through the control valve passes through the valve body 1 along the flow channel 15. A spindle 5 slides into the valve body 1. Sliding the spindle 5 along its sliding direction, the spindle 5 extends into or away from the flow channel 15, changing the flow area of ​​the flow channel 15, thereby changing the pressure and velocity of the fluid passing through the valve body 1. A labyrinth adjuster 4 extends into the flow channel 15. A protrusion 41 extends from the end of the labyrinth adjuster 4 near the end of the flow channel 15. The outer diameter of the protrusion 41 is less than the outer diameter of the labyrinth adjuster 4. A step 152 is recessed within the flow channel 15 to engage with the protrusion 41. The gap 42 between the flow channel 15 and the step 152 is tortuous. The medium flowing along the flow channel 15 passes through the gap 42. Without adjusting the position of the valve core 52, the smaller the gap 42 between the protrusion 41 and the step 152, the smaller the flow rate of the medium passing through the valve body 1. The position of the labyrinth adjuster 4 is unaffected by hydraulic oil and can be precisely adjusted manually, reducing the number of parts and lowering the requirements for machining precision. Manual adjustment of the labyrinth adjuster 4 also makes the control valve flow rate adjustment more intuitive. Simultaneously, the valve core 52 and the labyrinth adjuster 4 work together to achieve two-stage flow rate regulation, allowing the valve body 1 to be adjusted to a smaller flow rate, thus expanding the control valve's adjustment range.

[0034] In some embodiments, the labyrinth adjuster 4 can be coaxially arranged with the spindle 5. In this case, removing the labyrinth adjuster 4 allows for easy cleaning of components such as the valve core 52, valve seat 11, and pressure sleeve 12.

[0035] Please refer to Figure 1 and Figure 2 The protrusions 41 are stacked in at least two layers. The outer diameter of the protrusion 41 closer to the labyrinth adjuster 4 is greater than the outer diameter of the protrusion 41 farther from the labyrinth adjuster 4. Correspondingly, the steps 152 are also stacked in at least two layers. The cooperation of multiple layers of protrusions 41 and steps 152 results in more bends in the gap 42 between the protrusions 41 and steps 152. The gap 42 is more meandering, increasing the resistance encountered by the medium when passing through the gap 42, thereby achieving a smaller flow rate. When all protrusions 41 and steps 152 are in one-to-one correspondence, the gap 42 between the protrusions 41 and steps 152 is at its smallest level, at which point the flow rate of the gap 42 is minimal. When the protrusions 41 and steps 152 are staggered, that is, when the labyrinth adjuster 4 is moved to the side farther away from steps 152, some protrusions 41 no longer correspond to steps 152, and only some protrusions 41 are aligned with steps 152. The further the maze adjuster 4 is from the step 152, the wider the gap 42 between the protrusion 41 and the step 152, the fewer the bends in the gap 42, and the gradually increasing flow rate in the gap 42. When cleaning the surfaces of the protrusion 41 and the step 152, the maze adjuster 4 can be rotated back and forth, utilizing the medium and the friction between the protrusion 41 and the step 152 to quickly clean the surface of the gap 42.

[0036] Preferably, the labyrinth adjuster 4 and the protrusion 41 are rotating bodies. This facilitates the machining of the labyrinth adjuster 4 and the step 152, and ensures the assembly accuracy between the protrusion 41 and the step 152. The labyrinth adjuster 4 is threadedly connected to the valve body 1. Rotating the labyrinth adjuster 4 allows for precise adjustment of its position relative to the flow channel 15, thereby adjusting the width of the gap 42 between the protrusion 41 and the step 152, and thus precisely adjusting the flow rate of the control valve. In some embodiments, a polygonal hole may be formed on the surface of the labyrinth adjuster 4 away from the flow channel 15 to facilitate rotation of the labyrinth adjuster 4 and adjustment of its relative position to the flow channel 15.

[0037] More preferably, a sealing ring (not shown in the figure) is provided inside the valve body 1. The labyrinth adjuster 4 extends into the flow channel 15 after passing through the sealing ring. This enhances the sealing performance between the valve body 1 and the labyrinth adjuster 4. In some embodiments, sealing rings can be provided between the cover plate 3 and the valve core 52, between the cover plate 3 and the valve body 1, between the piston 6 and the valve core 52, between the piston 6 and the valve body 1, between the valve cover 2 and the valve core 52, and between the valve cover 2 and the valve body 1 to ensure the overall sealing performance of the precision control valve with online labyrinth adjustment.

[0038] Please refer to Figure 1 and Figure 2 The mandrel 5 includes a valve stem 51 and a valve core 52 near the flow channel 15. The diameter of the valve stem 51 is larger than the diameter of the valve core 52, ensuring the structural strength of the mandrel 5. An inclined surface 521 is provided on the valve core 52. The inclined surface 521 is angled to the axis of the valve core 52. When the valve core 52 moves axially, the inclined surface 521 makes the gap 42 between the mandrel 5 and the valve seat 11 change more uniformly and smoothly, facilitating the adjustment of the flow area between the mandrel 5 and the valve seat 11, and adjusting the flow rate of the medium flowing through the valve body 1. In some embodiments, a sealing gasket 112 is provided between the valve seat 11 and the valve body 1 on the side of the valve seat 11 away from the pressure sleeve 12. The sealing gasket 112 improves the sealing performance between the valve seat 11 and the valve body 1, preventing medium accumulation. Simultaneously, the elastic deformation of the sealing gasket 112 allows for a tighter contact between the valve seat 11 and the valve body 1. In some embodiments, the pressure sleeve 12 may also be block-shaped or rod-shaped, filling the gap 42 between the valve cover 2 and the valve seat 11 to fix the valve seat 11.

[0039] Preferably, the end of the spindle 5 away from the flow channel 15 extends out of the valve body 1, and a scale 512 is provided along the axial direction of the spindle 5. The scale 512 can be set to correspond to the flow area between the spindle 5 and the valve seat 11 when the valve stem 51 extends to this length. The flow rate of the flow channel 15 at the position of the valve core 52 is determined by referring to this scale 512.

[0040] In some embodiments, an indicator sleeve 7 may be fitted onto the spindle 5 extending from the valve body 1. The indicator sleeve 7 is bolted (not shown in the figure) to the valve body 1. The end of the indicator sleeve 7 away from the valve body 1 is aligned with different scales 512 for easy observation by the operator.

[0041] Please refer to Figure 1 and Figure 2 The valve body 1 also has a drive chamber 14. The spindle 5 passes through the drive chamber 14 and is fitted with a piston 6. The piston 6 separates the drive chamber 14. One side of the drive chamber 14 of the piston 6 is connected to the first oil passage 13, and the other side of the drive chamber 14 of the piston 6 is connected to the second oil passage 21. Hydraulic oil is injected into the opposite side of the piston 6 through the first oil passage 13 and the second oil passage 21 to adjust the pressure difference on the opposite side of the piston 6, thereby adjusting the position of the piston 6 in the drive chamber 14. The movement of the piston 6 causes the valve stem 51 to slide, thereby adjusting the flow area between the spindle 5 and the valve seat 11. The valve stem 51 is provided with a shoulder 511, which positions the piston 6. A retaining ring 53 is also engaged on the valve stem 51, specifically, an annular groove (not shown in the figure) is provided on the valve stem 51 to engage the retaining ring 53. The piston 6 is fixed between the retaining ring 53 and the shoulder 511.

[0042] Preferably, a valve seat 11 is provided within the flow channel 15. The valve seat 11 is sleeved on the spindle 5 extending into the flow channel 15. A lip 111 extends from the valve seat 11 around the surface of the spindle 5. The lip 111 is interference-fitted with the valve core 52 to block the gap 42 between the valve seat 11 and the valve core 52. At this time, the flow rate of the flow channel 15 is infinitely close to zero, thereby improving the adjustable ratio of the precision control valve with online adjustable labyrinth.

[0043] More preferably, a valve cover 2 is provided between the drive chamber 14 and the flow channel 15. The valve cover 2 isolates the drive chamber 14 and the flow channel 15. The valve cover 2 and the valve body 1 can be movably connected by bolts, facilitating the machining of the flow channel 15. The diameter of the flow channel 15 near the valve cover 2 is increased to form an expansion section 151. The valve seat 11 is disposed within the expansion section 151, and its position is fixed by the valve cover 2 and the valve body 1. A pressure sleeve 12 is provided between the valve seat 11 and the valve cover 2. The pressure sleeve 12 is a cylindrical body and is arranged around the spindle 5 to circumferentially and stably fix the position of the valve seat 11. A through hole 121 is provided on the pressure sleeve 12 to connect the inner and outer surfaces of the pressure sleeve 12, facilitating the flow of the medium.

[0044] In some embodiments, a cover plate 3 is also provided on the valve body 1. The cover plate 3 and the valve body 1 surround to form a drive chamber 14. The cover plate 3 is bolted to the valve body 1 to facilitate machining of the drive chamber 14. A second oil passage 21 is provided on the cover plate 3.

[0045] The specific workflow of this utility model is as follows:

[0046] When adjusting the flow rate of the precision control valve with an online adjustable labyrinth, the operator first rotates the labyrinth adjuster 4 to adjust the width of the gap 42 between the protrusion 41 and the step 152, and the number of turns in the gap 42's position path. Decreasing the flow rate moves the valve closer to the protrusion and step 152; increasing the flow rate moves it further away from the protrusion and step 152. Then, hydraulic oil is injected into or extracted from the drive chamber 14 through the first oil passage 13 and the second oil passage 21 to adjust the pressure on the opposite side of the piston 6, thus adjusting the piston 6 to a suitable position. The movement of the piston 6 causes the spindle 5 to slide, causing the valve seat 11 to correspond to different positions on the inclined surface 521, changing the gap 42 between the spindle 5 and the valve seat 11, and further adjusting the flow rate of the precision control valve with an online adjustable labyrinth. Decreasing the flow rate involves injecting hydraulic oil into the drive chamber 14 through the second oil passage 21 and discharging the hydraulic oil from the drive chamber 14 through the first oil passage 13. At this time, the piston 6 drives the valve core 52 to move closer to the flow channel 15, reducing the flow area between the valve core 52 and the valve seat 11. The flow rate is increased by injecting hydraulic oil into the drive chamber 14 through the first oil passage 13 and discharging the hydraulic oil from the drive chamber 14 through the second oil passage 21. At this time, the piston 6 drives the valve core 52 to move away from the flow channel 15, increasing the flow area between the valve core 52 and the valve seat 11.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A precision control valve with an online adjustable labyrinth, characterized in that, The precision control valve that allows for online adjustment of the labyrinth includes: Valve body, with flow channels; The mandrel is slidably fitted to the valve body; the mandrel slides along the sliding direction of the mandrel, extending into or away from the flow channel, thereby changing the flow area of ​​the flow channel; A labyrinth adjuster extends into the flow channel; a protrusion extends from the end of the labyrinth adjuster near the end of the flow channel; the outer diameter of the protrusion is less than the outer diameter of the labyrinth adjuster. The flow channel has a recessed step that complements the protrusion; the gap between the flow channel and the step is tortuous; the medium flowing along the flow channel flows through the gap.

2. The precision control valve with online adjustable labyrinth as described in claim 1, characterized in that: The protrusions are stacked in at least two layers; the outer diameter of the protrusion closer to the labyrinth adjuster is greater than the outer diameter of the protrusion farther from the labyrinth adjuster; correspondingly, the steps are also stacked in at least two layers.

3. The precision control valve with online adjustable labyrinth as described in claim 1, characterized in that: The labyrinth adjuster and the protrusion are rotating bodies; the labyrinth adjuster is threadedly connected to the valve body.

4. The precision control valve with online adjustable labyrinth as described in claim 3, characterized in that: A sealing ring is provided inside the valve body; the labyrinth adjuster extends into the flow channel after passing through the sealing ring.

5. The precision control valve with online adjustable labyrinth as described in claim 1, characterized in that: The mandrel includes a valve stem and a valve core near the flow channel; the diameter of the valve stem is larger than the diameter of the valve core; the valve core has an inclined surface; the inclined surface is set at an angle to the axis of the valve core.

6. The precision control valve with online adjustable labyrinth as described in claim 1, characterized in that: The valve body also has a drive chamber; the spindle passes through the drive chamber and is fitted with a piston; the piston separates the drive chamber; the drive chamber on one side of the piston is connected to the first oil passage, and the drive chamber on the other side of the piston is connected to the second oil passage.

7. The precision control valve with online adjustable labyrinth as described in claim 6, characterized in that: A valve seat is provided inside the flow channel; the valve seat is sleeved on the mandrel that extends into the flow channel; the valve seat extends around the surface of the mandrel with a lip.

8. The precision control valve with online adjustable labyrinth as described in claim 7, characterized in that: A valve cover is provided between the drive chamber and the flow channel; the valve cover isolates the drive chamber and the flow channel; the diameter of the flow channel near the valve cover increases to form an expansion section; the valve seat is disposed within the expansion section.

9. The precision control valve with online adjustable labyrinth as described in claim 8, characterized in that: A pressure sleeve is provided between the valve seat and the valve cover; the pressure sleeve is a cylindrical body and is arranged around the mandrel; a through hole is provided on the pressure sleeve to connect the inner and outer surfaces of the pressure sleeve.

10. The precision control valve with online adjustable labyrinth as described in claim 1, characterized in that: The end of the mandrel away from the flow channel extends out of the valve body, and a scale is set along the axial direction of the mandrel.

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