Self-sealing pre-opening labyrinth type regulating valve

By designing a self-sealed pre-starting maze control valve, the internal leakage problem caused by inconsistent with the direction of the valve flap closing and the direction of the medium flow in the existing control valve is solved, low thrust and good sealing when the valve is opened, and the adjustment linearity is improved through the maze structure.

CN222760335UActive Publication Date: 2025-04-15QINGDAO GAOYUAN THERMAL POWER EQUIP CO LTD
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Patent Information

Application Number
CN202421320710.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-12
Publication Date
2025-04-15
Estimated Expiration
2034-06-12

AI Technical Summary

Technical Problem

Existing control valves are prone to internal leakage problems when the valve disc closure direction is inconsistent with the media flow direction, and the valve stem sealing point is prone to external leakage, which leads to poor erosion and adjustment linearity.

Method used

A self-sealed pre-starting maze type regulating valve is designed. The closing direction of the valve disc is the same as the flow direction of the medium. It is equipped with a resistance channel type maze and is set at the low-pressure side at the sealing point of the valve stem to avoid leakage.

Benefits of technology

It effectively avoids internal leakage when the valve disc is closed, reduces the thrust when the valve is opened, ensures the sealing of the medium, and achieves good adjustment linearity through the maze structure.

✦ Generated by Eureka AI based on patent content.

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    Figure CN222760335U_ABST
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Abstract

According to the technical scheme, the self-sealing pre-opening labyrinth type regulating valve is characterized by comprising a valve seat; the closing direction of the large valve clack is the same as the medium flowing direction, and a plurality of through holes penetrating through the large valve clack are formed in the large valve clack; the small valve clack is located on the side, facing the opening direction, of the large valve clack, the small valve clack is attached to and separated from the large valve clack by sliding in the same straight line direction with the large valve clack, and when the small valve clack is attached to the large valve clack, the through holes in the large valve clack are closed; the valve rod is used for driving the large valve clack and the small valve clack to move; the closing direction of the large valve clack is set to be the same as the flowing direction of a medium, the problem of inner leakage is not prone to occurring when the large valve clack is closed, during opening, the small valve clack is opened firstly, a high-pressure medium enters the rear side of the large valve clack through the through hole, thrust generated when the large valve clack is opened is reduced, a sealing point of the valve rod is arranged on the low-pressure side, and the problem of outer leakage is solved.
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Description

Technical Field

[0001] The utility model relates to a regulating valve, more specifically, it relates to a self-sealing pre-starting labyrinth regulating valve. Background Art

[0002] A regulating valve is a valve used to adjust process parameters such as medium flow, pressure, temperature, liquid level, etc. in the field of industrial automation process control. It automatically adjusts the valve opening according to the control signal of the automation system, thereby achieving the regulation of medium flow, pressure, temperature and liquid level.

[0003] Among the existing regulating valves, some valve discs have a closing direction opposite to the medium flow direction, which is prone to internal leakage; when the closing direction of some valve discs is the same as the medium flow direction, the opening direction of the valve disc must be opposite to the medium flow direction, which will cause the valve to be difficult to open. Some valve stem sealing points are on the high-pressure side, which is prone to external leakage; some are not equipped with a good maze, causing scouring problems and poor adjustment linearity problems. There is no regulating valve that can solve all the above problems at the same time. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a self-sealing pre-starting labyrinth regulating valve, which sets the closing direction of the large valve flap to be the same as the medium flow direction, so that the closing of the large valve flap is not prone to internal leakage. When opening, the small valve flap is opened first, and the high-pressure medium enters the rear side of the large valve flap through the through hole, reducing the thrust when the large valve flap is opened; the valve stem seal is set on the low-pressure side and is equipped with a resistance channel-type labyrinth.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a self-sealing pre-starting labyrinth regulating valve, comprising a valve seat, wherein a matching surface is arranged inside the valve seat;

[0006] A large valve flap, wherein the large valve flap changes the distance between the large valve flap and the valve seat by sliding and can contact the matching surface in the valve seat to close the valve, the closing direction of the large valve flap is the same as the flow direction of the medium, and the large valve flap is provided with a plurality of through holes penetrating the large valve flap;

[0007] A small valve flap, the small valve flap is located on the side of the large valve flap facing the opening direction, and the small valve flap is fitted with and separated from the large valve flap by sliding in the same straight line direction as the large valve flap. When the small valve flap is fitted on the large valve flap, multiple through holes on the large valve flap are closed;

[0008] And a valve stem, wherein the valve stem is used for driving the large valve flap and the small valve flap to move.

[0009] The utility model is further configured as follows: one end of the valve stem connected to the large valve flap and the small valve flap is fixedly connected with a limit tube sleeved outside the valve stem, the limit tube includes a large diameter section and a small diameter section, the diameter of the small diameter section is smaller than the diameter of the large diameter section, the small diameter section passes through the large valve flap along the switching direction of the large valve flap and is connected to the small valve flap, when the small valve flap is pressed tightly on the large valve flap, a space is left between the large diameter section close to one end of the small diameter section and the large valve flap, when the large diameter section close to one end of the small diameter section contacts the large valve flap, the small valve flap is separated from the large valve flap.

[0010] The utility model is further configured as follows: a matching groove is provided at one end of the large valve disc close to the small valve disc, the outer side of the matching groove is configured as an inclined surface with the bottom inclined away from the center of the small valve disc, and the through hole is provided in the matching groove;

[0011] The outer side of the small valve disc near one end of the large valve disc is set as an arc chamfer, so that when the small valve disc enters the matching groove, the arc chamfer contacts the inclined surface and leaves space between the small valve disc and the top groove wall of the matching groove.

[0012] The utility model is further configured as follows: it also includes a tee, and the valve seat is fixedly connected to the inner wall of one end of the tee at which the medium is discharged;

[0013] A labyrinth, which is fixedly connected to the valve seat and is used to receive the medium sent out by the tee;

[0014] And a medium outlet pipe, wherein the medium outlet pipe is sleeved outside the labyrinth to receive the medium after the labyrinth is depressurized.

[0015] The utility model is further configured as follows: the labyrinth is used to relieve pressure on the medium, the labyrinth comprises inner and outer three-layer casings, and the labyrinth is composed of pressure relief holes on the inner and outer three-layer casings.

[0016] The utility model is further configured as follows: the maze is composed of a first pressure relief sleeve, a second pressure relief sleeve and a third pressure relief sleeve from the inside to the outside, the aperture of the pressure relief hole on the second pressure relief sleeve is larger than the aperture of the pressure relief hole on the third pressure relief sleeve, and the aperture of the pressure relief hole on the third pressure relief sleeve is larger than the aperture of the pressure relief hole on the first pressure relief sleeve.

[0017] The utility model is further configured as follows: the valve stem outer sleeve is provided with a sealing tube that fits with the inner wall of the labyrinth, and the sealing tube is fixedly connected to the valve stem through a connecting rod. When the large valve disc is closed on the valve seat, the sealing tube completely closes the pressure relief holes on the labyrinth. When the large valve disc and the valve seat gradually move away from the valve seat, the sealing tube gradually opens the pressure relief holes on the labyrinth.

[0018] The utility model is further configured as follows: it also includes a neck tube seat, the neck tube seat is fixedly connected to the top of the labyrinth, and the valve stem passes through the neck tube seat;

[0019] An inner sealing member, the inner sealing member being arranged at the connection between the valve stem and the neck tube seat;

[0020] A neck tube, the neck tube is fixedly connected to the side of the sealing seat away from the large valve disc and is fixedly connected to the outlet medium pipe, the valve stem passes through the neck tube, and a low-pressure hole connected to the outlet medium pipe is arranged outside the neck tube;

[0021] And an outer sealing member, wherein the outer sealing member is arranged at the connection between the end of the valve stem away from the neck tube seat and the neck tube.

[0022] In summary, the present invention has the following beneficial effects compared with the prior art:

[0023] 1. The utility model has a self-sealing effect by setting the closing direction of the large valve disc to be the same as the flow direction of the medium, so that the closing of the large valve disc is not prone to internal leakage;

[0024] 2. When opening, open the small valve disc first, and the high-pressure medium enters the rear side of the large valve disc through the through hole to balance the pressure difference, reducing the thrust when the large valve disc is opened;

[0025] 3. The valve stem sealing point is set at the medium outlet, that is, the low-pressure side, to effectively avoid the problem of medium leakage;

[0026] 4. It is equipped with an independent channel maze structure, which effectively decomposes the pressure difference scouring effect and achieves good adjustment linearity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of an embodiment;

[0028] Figure 2 is a cross-sectional view of the overall structure of the embodiment;

[0029] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0030] Figure 4 for Figure 2 An enlarged schematic diagram of part B.

[0031] In the figure: 1, tee; 2, medium outlet pipe; 3, valve seat; 4, large valve disc; 41, through hole; 42, matching groove; 5, small valve disc; 6, valve stem; 61, sealing tube; 7, limit tube; 71, large diameter section; 72, small diameter section; 8, labyrinth; 9, neck tube seat; 91, neck tube; 911, low pressure hole; 92, inner sealing member; 93, outer sealing member. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0033] The utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0034] Embodiment: A self-sealing pre-starting labyrinth regulating valve, see attached Figure 1 -Attached Figure 4 , including a valve seat 3, a large valve flap 4, a small valve flap 5 and a valve stem 6. The valve seat 3 is provided with a mating surface inside; the large valve flap 4 changes the distance between it and the valve seat 3 by sliding and can contact with the mating surface inside the valve seat 3 to realize valve closing, the closing direction of the large valve flap 4 is the same as the medium flow direction, and the large valve flap 4 is provided with a plurality of through holes 41 penetrating the large valve flap 4; the small valve flap 5 is located on the side of the large valve flap 4 facing the opening direction, and the small valve flap 5 is fitted with and separated from the large valve flap 4 by sliding in the same straight line direction as the large valve flap 4, and the plurality of through holes 41 on the large valve flap 4 are closed when the small valve flap 5 is fitted on the large valve flap 4; the valve stem 6 is used to drive the large valve flap 4 and the small valve flap 5 to move.

[0035] By setting the closing direction of the large valve flap 4 to be the same as the medium flow direction, the closing of the large valve flap 4 is less likely to cause internal leakage. When opening, the small valve flap 5 is opened first, and the high-pressure medium enters the rear side of the large valve flap 4 through the through hole 41, reducing the resistance when the large valve flap 4 is opened.

[0036] Specifically, one end of the valve stem 6 connected to the large valve flap 4 and the small valve flap 5 is fixedly connected to a limit tube 7 sleeved on the outside of the valve stem 6. The limit tube 7 includes a large diameter section 71 and a small diameter section 72. The diameter of the small diameter section 72 is smaller than the diameter of the large diameter section 71. The small diameter section 72 penetrates the large valve flap 4 along the switching direction of the large valve flap 4 and is connected to the small valve flap 5. When the small valve flap 5 is pressed tightly on the large valve flap 4, a space is left between the end of the large diameter section 71 close to the small diameter section 72 and the large valve flap 4. When the end of the large diameter section 71 close to the small diameter section 72 contacts the large valve flap 4, the small valve flap 5 is separated from the large valve flap 4.

[0037] By setting the outer limiting tube 7 of the valve stem 6, when the valve flap is opened, the small valve flap 5 and the large valve flap 4 can be opened in sequence, and when the valve flap is closed, the large valve flap 4 and the small valve flap 5 can be closed in sequence.

[0038] The large valve flap 4 is provided with a matching groove 42 at one end close to the small valve flap 5, the outer side of the matching groove 42 is provided with an inclined surface with the bottom inclined away from the center of the small valve flap, and the through hole 41 is provided in the matching groove 42;

[0039] The outer side of the small valve flap 5 close to one end of the large valve flap 4 is set as an arc chamfer, so that when the small valve flap 5 enters the matching groove 42, the arc chamfer contacts the inclined surface and leaves a space between the small valve flap 5 and the top groove wall of the matching groove 42.

[0040] Specifically, it also includes a tee 1, a labyrinth 8 and a medium outlet pipe 2. The valve seat 3 is fixedly connected to the inner wall of the liquid outlet end of the tee 1; the labyrinth 8 is fixedly connected to the valve seat 3 and is used to receive the medium sent out by the tee 1; the medium outlet pipe 2 is sleeved outside the labyrinth 8 to receive the medium after the labyrinth 8 is depressurized.

[0041] The labyrinth 8 is used to relieve pressure on the medium. The labyrinth 8 includes three layers of inner and outer casings. The labyrinth is composed of pressure relief holes on the three layers of inner and outer casings. The pressure is relieved step by step through the labyrinth composed of multiple layers of pressure relief holes, which reduces the pressure difference at each level, effectively decomposes the pressure difference scouring effect, and achieves good adjustment linearity.

[0042] Specifically, the maze 8 comprises, from the inside to the outside, a first pressure relief sleeve, a second pressure relief sleeve and a third pressure relief sleeve, the aperture of the pressure relief hole on the second pressure relief sleeve is larger than the aperture of the pressure relief hole on the third pressure relief sleeve, and the aperture of the pressure relief hole on the third pressure relief sleeve is larger than the aperture of the pressure relief hole on the first pressure relief sleeve.

[0043] Specifically, the valve stem 6 is outer-mounted with a sealing tube 61 that fits with the inner wall of the labyrinth 8. The sealing tube 61 is fixedly connected to the valve stem 6 through a connecting rod. When the large valve flap 4 is closed on the valve seat 3, the sealing tube 61 closes all the pressure relief holes on the labyrinth 8. When the large valve flap 4 and the valve seat 3 gradually move away from the valve seat 3, the sealing tube 61 gradually opens the pressure relief holes on the labyrinth 8.

[0044] Specifically, the present embodiment further comprises a neck tube seat 9, an inner sealing member 92, a neck tube 91 and an outer sealing member 93. The neck tube seat 9 is fixedly connected to the top of the labyrinth 8, and the valve stem 6 passes through the neck tube seat 9; the inner sealing member 92 is arranged at the connection between the valve stem 6 and the neck tube seat 9; the neck tube 91 is fixedly connected to the side of the neck tube seat 9 away from the large valve disc 4 and is fixedly connected to the outlet medium pipe 2, the valve stem 6 passes through the neck tube 91, and a low-pressure hole 911 connected to the outlet medium pipe 2 is arranged outside the neck tube 91; an outer sealing member 93 is arranged at the connection between the end of the valve stem 6 away from the neck tube seat 9 and the neck tube 91. The sealing gasket of the valve stem 6 is arranged at the medium outlet, that is, the low-pressure side, which can effectively avoid the problem of medium leakage.

[0045] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A self-sealing pre-starting labyrinth regulating valve, characterized in that: It comprises a valve seat (3), wherein a matching surface is arranged inside the valve seat (3); A large valve flap (4), wherein the large valve flap (4) changes the distance between the large valve flap (4) and the valve seat (3) by sliding and can contact with the matching surface in the valve seat (3) to close the valve, the closing direction of the large valve flap (4) being the same as the flow direction of the medium, and the large valve flap (4) being provided with a plurality of through holes (41) penetrating the large valve flap (4); A small valve flap (5), the small valve flap (5) being located on a side of the large valve flap (4) facing the opening direction, the small valve flap (5) being able to fit in and out of the large valve flap (4) by sliding in the same straight line direction as the large valve flap (4), and closing a plurality of through holes (41) on the large valve flap (4) when the small valve flap (5) fits in the large valve flap (4); And a valve stem (6), wherein the valve stem (6) is used to drive the large valve flap (4) and the small valve flap (5) to move.

2. The self-sealing pre-starting labyrinth regulating valve according to claim 1 is characterized in that: One end of the valve stem (6) connected to the large valve flap (4) and the small valve flap (5) is fixedly connected to a limit tube (7) sleeved on the outside of the valve stem (6); the limit tube (7) comprises a large diameter section (71) and a small diameter section (72); the diameter of the small diameter section (72) is smaller than the diameter of the large diameter section (71); the small diameter section (72) penetrates the large valve flap (4) along the opening and closing direction of the large valve flap (4) and is connected to the small valve flap (5); when the small valve flap (5) is pressed against the large valve flap (4), a space is left between the end of the large diameter section (71) close to the small diameter section (72) and the large valve flap (4); when the end of the large diameter section (71) close to the small diameter section (72) contacts the large valve flap (4), the small valve flap (5) is separated from the large valve flap (4).

3. The self-sealing pre-starting labyrinth regulating valve according to claim 1 is characterized in that: The large valve flap (4) is provided with a matching groove (42) at one end close to the small valve flap (5), the outer side of the matching groove (42) is provided with an inclined surface with the bottom inclined in a direction away from the center of the small valve flap, and the through hole (41) is provided in the matching groove (42); The outer side edge of the small valve flap (5) close to one end of the large valve flap (4) is arranged as an arc chamfer, so that when the small valve flap (5) enters the matching groove (42), the arc chamfer contacts the inclined surface and a space is left between the small valve flap (5) and the top groove wall of the matching groove (42).

4. The self-sealing pre-starting labyrinth regulating valve according to claim 1 is characterized in that: It also includes a tee (1), wherein the valve seat (3) is fixedly connected to the inner wall of the liquid outlet end of the tee (1); A labyrinth (8), wherein the labyrinth (8) is fixedly connected to the valve seat (3) and is used to receive the medium sent out by the tee (1); and a medium outlet pipe (2), wherein the medium outlet pipe (2) is sleeved outside the labyrinth (8) to receive the medium after the pressure of the labyrinth (8) is released.

5. The self-sealing pre-starting labyrinth regulating valve according to claim 4 is characterized in that: The labyrinth (8) is used to relieve pressure on a medium. The labyrinth (8) comprises three layers of inner and outer casings. The labyrinth is composed of pressure relief holes on the three layers of inner and outer casings.

6. The self-sealing pre-starting labyrinth regulating valve according to claim 5, characterized in that: The labyrinth (8) comprises, from the inside to the outside, a first pressure relief sleeve, a second pressure relief sleeve and a third pressure relief sleeve, the diameter of the pressure relief hole on the second pressure relief sleeve is larger than the diameter of the pressure relief hole on the third pressure relief sleeve, and the diameter of the pressure relief hole on the third pressure relief sleeve is larger than the diameter of the pressure relief hole on the first pressure relief sleeve.

7. The self-sealing pre-start labyrinth regulating valve according to claim 5, characterized in that: The valve stem (6) is provided with a sealing tube (61) which is in contact with the inner wall of the labyrinth (8). The sealing tube (61) is fixedly connected to the valve stem (6) via a connecting rod. When the large valve flap (4) is closed on the valve seat (3), the sealing tube (61) completely closes the pressure relief holes on the labyrinth (8). When the large valve flap (4) and the valve seat (3) gradually move away from the valve seat (3), the sealing tube (61) gradually opens the pressure relief holes on the labyrinth (8).

8. The self-sealing pre-starting labyrinth regulating valve according to claim 7, characterized in that: It also includes a neck tube seat (9), which is fixedly connected to the top of the labyrinth (8), and the valve stem (6) passes through the neck tube seat (9); An inner sealing member (92), wherein the inner sealing member (92) is arranged at the connection between the valve stem (6) and the neck tube seat (9); A neck tube (91), the neck tube (91) is fixedly connected to the medium outlet pipe (2), the valve stem (6) passes through the neck tube (91), and a low-pressure hole (911) communicating with the medium outlet pipe (2) is arranged outside the neck tube (91); And an outer sealing member (93), wherein the outer sealing member (93) is provided at the connection between the end of the valve stem (6) away from the neck tube seat (9) and the neck tube (91).