CN220870140U

CN220870140U - Zero inner leakage control valve

Info

Publication number: CN220870140U
Application number: CN202322511676.4U
Authority: CN
Inventors: 方必坤; 鲍小兵; 方明; 肖雄
Original assignee: Guangdong Shangkun Industrial Technology Co ltd
Current assignee: Guangdong Shangkun Industrial Technology Co ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2024-04-30
Anticipated expiration: 2033-09-15

Abstract

The utility model relates to a zero-internal leakage air control valve, which is provided with a valve body, a guide sleeve and a valve core, wherein the guide sleeve is positioned in an inner cavity of the valve body and separates the inner cavity into a transition valve chamber and a pneumatic chamber; the valve core is arranged in a way that the valve core can move along the first axial direction through pneumatic control, so that a closed state and an open state of the detection flow channel are constructed; in the closed state, the plug plugs the valve port; in the open state, the plug leaves the valve port, and the annular table is attached to the sealing part of the guide sleeve along the first axial direction to form axial attaching seal. The structure is simple, the assembly, the use and the maintenance are convenient, and the device is suitable for various environments; the dynamic sliding direction sealing is optimized to be axial sealing, zero internal leakage of the pneumatic control valve can be achieved when the dynamic sliding direction sealing is used for airtight detection, and the service life of the sealing element is prolonged.

Description

Zero inner leakage control valve

Technical Field

The utility model relates to the technical field of hardware of detection instruments, in particular to a pneumatic control valve for an airtight detection instrument.

Background

At present, due to the requirement of working environment, the requirement on the tightness of products is increased, such as a box body or a box body, and the like, good tightness is required to be provided, and water, oil, dust and the like are prevented from entering, so that effective work of parts assembled in the box body can be ensured, and therefore air tightness detection is required.

When the part with the sealing performance requirement is used in the new energy industry to perform differential pressure type sealing performance detection, most of pneumatic control valves required by the airtight detection instrument are radially sealed by the sliding valve core, namely, sealing rings are arranged on the periphery of the sliding valve core or the inner wall of the corresponding sliding inner cavity, at the moment, due to the sliding requirement, the sealing tight fit degree cannot be too high, and the sealing rings are inevitably worn after continuous sliding, the leakage of a control air source and the serial communication of a detection air source all cause misjudgment when the sealing performance of the part is detected, which brings about disadvantages to detection work, and the inventor analyzes the structural defects of the existing pneumatic control valve in detail.

Disclosure of Invention

The utility model aims to provide a zero internal leakage control valve which well solves the technical problems, achieves zero internal leakage and is durable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

A zero-in-blow-by control valve, comprising:

The valve body is internally provided with an inner cavity which extends along the first axial direction, and one extending end of the inner cavity is provided with a valve port which is communicated with a detection flow passage preset on the valve body;

A guide sleeve positioned in the inner cavity of the valve body and separating the inner cavity into a transition valve chamber and a pneumatic chamber, wherein the transition valve chamber is close to the valve port and communicated with the valve port; the guide sleeve is provided with a through hole and a sealing part, the through hole penetrates through the guide sleeve along the first axial direction, and the sealing part is arranged on the end face of the guide sleeve facing the valve port and surrounds the through hole;

The valve core is arranged in the inner cavity of the valve body and penetrates through the through hole of the guide sleeve, one end of the valve core facing the valve port is provided with a ring table and a plug, and the ring table and the plug are positioned in the transition valve chamber; the valve core is arranged in a way that the valve core can move along the first axial direction through pneumatic control, so that a closed state and an open state of the detection flow channel are constructed; in the closed state, the plug plugs the valve port; in the open state, the plug leaves the valve port, and the annular table is attached to the sealing part of the guide sleeve along the first axial direction to form axial attaching seal.

The valve core is further provided with a piston part at one end far away from the valve port, the piston part is positioned in the pneumatic chamber and driven by a positive and negative external control air source, so that the valve core moves positively and negatively along the first axial direction, and at least one spring which acts on the valve core permanently along the first axial direction, so that the valve core obtains pretightening force for approaching to the valve port.

The valve body is formed by splicing an upper valve body and a lower valve body along a first axial direction, and a detection flow channel is formed on the lower valve body; the periphery of the guide sleeve is provided with a radial convex annular edge which is embedded in the splicing position of the upper valve body and the lower valve body, and the upper side surface and/or the lower side surface of the annular edge are respectively subjected to static sealing treatment with the upper valve body and the lower valve body.

The above scheme is further that a first sealing ring is embedded between the sealing parts of the annular table and the guide sleeve, the first sealing ring is positioned on the upper side surface of the annular table surface towards the sealing part, and the first sealing ring is used for establishing axial fit sealing with the sealing part of the guide sleeve in cooperation with the annular table.

The valve core is further formed by axially combining an upper valve core and a lower valve core, a ring table and a plug are arranged on the lower valve core, a piston part is arranged on the upper valve core, the piston part is abutted against the upper end part of the guide sleeve in a closed state of the detection flow passage, a second sealing ring is embedded between the piston part and the upper end part of the guide sleeve, the second sealing ring is positioned on the upper end part of the guide sleeve, and the second sealing ring surrounds the through hole.

The above scheme is that the static sealing treatment comprises embedding a third sealing ring between the upper side surface of the annular edge and the upper valve body, and embedding a fourth sealing ring between the lower side surface of the annular edge and the lower valve body, wherein the sealing positions of the third sealing ring and the fourth sealing ring form an up-down corresponding relationship.

According to the utility model, through optimizing the structure, pneumatic control is realized, and meanwhile, axial fit sealing is formed between the valve core and the guide sleeve, so that dynamic sliding direction sealing is optimized into axial sealing, the problems of easy damage and easy leakage of the traditional radial sealing are overcome, and the service life of the sealing element is prolonged; when the pneumatic control valve is used for airtight detection, zero internal leakage of the pneumatic control valve can be realized when the part is used for differential pressure type tightness detection, and the detection is accurate.

The utility model has the advantages of simple structure, convenient assembly, use and maintenance, low investment cost and suitability for various environments.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is an exploded view of the embodiment of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the internal structure of FIG. 1;

FIG. 4 is a schematic diagram of the combination of the valve core and the guide sleeve of the embodiment of FIG. 1;

FIG. 5 is a schematic diagram of the control flow of the gas circuit for differential pressure type dual-channel tightness detection according to the present utility model.

Detailed Description

The conception, specific structure, and technical effects of the present utility model will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present utility model.

It should be noted that, in the description of the present utility model, terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

Referring to fig. 1, 2, 3 and 4, which are schematic views of a preferred embodiment of the present utility model, the present utility model relates to a zero internal leakage control valve, which comprises a valve body 1, a guide sleeve 2 and a valve core 3, wherein an inner cavity 11 is arranged in the valve body 1, the inner cavity 11 extends along a first axial direction, a valve port 12 is arranged at one extending end of the inner cavity 11, and the valve port 12 is communicated with a detection flow channel preset on the valve body; for easy manufacture and assembly, the valve body 1 is preferably divided into an upper valve body 15 and a lower valve body 16, and the upper valve body 15 and the lower valve body 16 are spliced together along the first axial direction to form a whole. The lower valve body 16 is provided with a detection flow passage, the detection flow passage in the figure is provided with a first detection air hole 61 and a second detection air hole 62 which are arranged at intervals and are communicated through the inner cavity 11, the inner port of the first detection air hole 61 communicated with the inner cavity 11 forms a valve port 12, and the outer ports of the first detection air hole 61 and the second detection air hole 62 are respectively arranged on the lower end face of the lower valve body 16, so that the connection of a detection air source is facilitated. The guide sleeve 2 is positioned in the inner cavity 11 of the valve body 1 and separates the inner cavity 11 into a transition valve chamber 13 and a pneumatic chamber 14, the transition valve chamber 13 being adjacent to the valve port 12 and communicating with the valve port 12. The guide sleeve 2 is provided with a through hole 21 and a sealing part 22, the through hole 21 penetrates the guide sleeve 2 along the first axial direction, and the sealing part 22 is arranged on the end surface of the guide sleeve 2 facing the valve port 12 and surrounds the through hole 21. The valve core 3 is arranged in the inner cavity 11 of the valve body 1 and penetrates through the through hole 21 of the guide sleeve 2, one end of the valve core 3 facing the valve port 12 is provided with a ring table 31 and a plug 32, and the ring table 31 and the plug 32 are positioned in the transition valve chamber 13; the valve core 3 is arranged in a manner that the valve core can move along the first axial direction through pneumatic control, so that a closed state and an open state of the detection flow channel are constructed; in the closed state, the plug 32 plugs the valve port 12; in the open state, the plug 32 leaves the valve port 12, and the annular table 31 is attached to the sealing part 22 of the guide sleeve 2 along the first axial direction to form an axial attaching seal, and the seal is in a face-to-face attaching mode and cannot be worn by sliding of the valve core 3, so that the dynamic sliding direction seal is optimized to be an axial seal, and the problems of easy damage and easy leakage of the traditional radial seal can be overcome.

In the present embodiment, a first sealing ring 51 is further embedded between the annular table 31 and the sealing portion 22 of the guide sleeve 2, the first sealing ring 51 is positioned on the upper side surface of the annular table 31 facing the sealing portion 22, and the first sealing ring 51 is used for establishing an axial fit seal between the annular table 31 and the sealing portion 22 of the guide sleeve 2. In order to facilitate positioning and installation of the first seal ring 51, a ring groove is formed in the upper side surface of the ring table 31 facing the sealing portion 22, so that the first seal ring 51 can be just embedded and installed. In operation, the annular table 31 is attached to the sealing portion 22 of the guide sleeve 2 along the first axial direction, and the first sealing ring 51 is axially pressed to be in close contact with the annular table 31 and the sealing portion 22, so that the tightness is improved, and the control gas in the pneumatic chamber 14 is prevented from leaking to the transition valve chamber 13 through the through hole 21.

As shown in fig. 2, 3 and 4, in this embodiment, a piston portion 33 is disposed at an end of the valve core 3 away from the valve port 12, the piston portion 33 is located in the pneumatic chamber 14 and driven by a positive and negative external control air source, so that the valve core 3 moves forward and backward along the first axial direction, and at least one spring 4 acts on the valve core 3 permanently along the first axial direction, so that the valve core 3 obtains a pretightening force for moving towards the valve port 12, and by virtue of the design of the spring 4, the valve core 3 can move towards the valve port 12, and a retaining force for blocking the valve port 12 by the plug 32 is given, so that the closing effect of the detection flow passage is improved. In this embodiment, the valve port 12, the plug 32, the valve core 3 and the spring 4 are on the same axis, the valve port 12 is preferably a central position of the inner bottom of the inner cavity 11, the first detection air hole 61 extends vertically along the center of the valve port 12, and for convenience in matching with the plug 32, the valve port 12 is lifted by a certain height by a corresponding inner boss, so that when the plug 32 is in downward abutting connection with the valve port 12, the peripheral interference of the plug 32 can be effectively reduced, and accuracy and stability of the plug 32 abutting against the valve port 12 are ensured.

In this embodiment, the valve core 3 is axially combined by an upper valve core and a lower valve core, in the figure, preferably, the upper valve core and the lower valve core are connected together through threads, that is, an internal threaded hole is formed on the upper valve core, an axially protruding threaded column is formed on the lower valve core, the upper valve core and the lower valve core are screwed into the internal threaded hole through the threaded column, so that the upper valve core and the lower valve core are combined and connected, and the combined part of the upper valve core and the lower valve core in this embodiment is just sleeved in the through hole 21 of the guide sleeve 2. In this embodiment, the lower valve core is provided with the annular table 31 and the plug 32, wherein the annular table 31 and the lower valve core are integrally manufactured, and the plug 32 is assembled into the preset shaft hole on the lower valve core through a bolt form and then fixed, and the fixing mode can be radial screw locking, so that the structure is simple, and the manufacture and the assembly are convenient. The upper valve core is provided with a piston part 33, the piston part 33 is positioned in the pneumatic chamber 14, the pneumatic chamber 14 is connected with an external control air source through a first control air hole 71 and a second control air hole 72, the first control air hole 71 and the second control air hole 72 are respectively arranged on the upper side and the lower side of the piston part 33, when the first control air hole 71 and the second control air hole 72 alternately input the control air source, the piston part 33 is driven to move up and down along a first axial direction in the pneumatic chamber 14, and then the valve core 3 moves forward and backward along the first axial direction, so that the closed state and the open state of a detection flow channel are constructed. In the closed state of the detection flow passage, the piston part 33 abuts against the upper end part of the guide sleeve 2, and in order to further improve the air tightness of the product, a second sealing ring 52 is embedded between the piston part 33 and the upper end part of the guide sleeve 2, the second sealing ring 52 is positioned on the upper end part of the guide sleeve 2, and the second sealing ring 52 surrounds the through hole 21, so that the control gas in the pneumatic chamber 14 is prevented from leaking to the transition valve chamber 13 through the through hole 21 in the closed state of the detection flow passage.

In the embodiment, the valve body 1 is divided into an upper valve body 15 and a lower valve body 16 to be combined, at this time, the periphery of the guide sleeve 2 is provided with a radially outwards protruding annular edge 23, the annular edge 23 is just embedded at the splicing position of the upper valve body 15 and the lower valve body 16, and the annular edge 23 is clamped by the upper valve body 15 and the lower valve body 16, so that the guide sleeve 2 is stabilized in the inner cavity of the valve body 1; and static sealing treatment is carried out on the upper side surface and/or the lower side surface of the annular edge 23 and the upper valve body 15 and the lower valve body 16 respectively. The static sealing treatment comprises embedding a third sealing ring 53 between the upper side surface of the annular edge 23 and the upper valve body 15, and embedding a fourth sealing ring 54 between the lower side surface of the annular edge 23 and the lower valve body 16, wherein the sealing positions of the third sealing ring 53 and the fourth sealing ring 54 form an up-down corresponding relationship, and the sealing performance of the product is greatly improved by multi-point sealing.

According to the utility model, through optimizing the structure, pneumatic control is realized, and dynamic sliding direction sealing is optimized into axial sealing, so that the problems of easy damage and easy leakage of the traditional radial sealing are overcome, and the service life of the sealing element is prolonged; when the pneumatic control valve is used for airtight detection, zero internal leakage of the pneumatic control valve can be realized when the part is used for differential pressure type tightness detection, and the detection is accurate. The structure is simple, the assembly, the use and the maintenance are convenient, the investment cost is low, and the device is suitable for various environments; as shown in figure 5, the utility model is used for differential pressure type double-channel tightness detection gas circuit control, and the normally closed pneumatic control valve is the zero internal leakage pneumatic control valve provided by the utility model, and is matched with a differential pressure type air tightness meter for detection, so that the zero internal leakage is achieved, the detection accuracy is improved, and the service life is long.

The present utility model has been described in detail with reference to the embodiments, but it is to be understood that the utility model is not limited to the embodiments, and is intended to be interpreted by those skilled in the art as including the following claims.

Claims

1. The zero internal leakage control valve is characterized by comprising:

The valve comprises a valve body (1), wherein an inner cavity (11) is arranged in the valve body (1), the inner cavity (11) extends along a first axial direction, one extending end of the inner cavity (11) is provided with a valve port (12), and the valve port (12) is communicated with a detection flow passage preset on the valve body;

A guide sleeve (2), the guide sleeve (2) being positioned in the inner cavity (11) of the valve body (1) and separating the inner cavity (11) into a transition valve chamber (13) and a pneumatic chamber (14), the transition valve chamber (13) being adjacent to the valve port (12) and communicating with the valve port (12); the guide sleeve (2) is provided with a through hole (21) and a sealing part (22), the through hole (21) penetrates through the guide sleeve (2) along the first axial direction, and the sealing part (22) is arranged on the end face of the guide sleeve (2) facing the valve port (12) and surrounds the through hole (21);

The valve core (3) is arranged in the inner cavity (11) of the valve body (1) and penetrates through the through hole (21) of the guide sleeve (2), one end of the valve core (3) facing the valve port (12) is provided with a ring table (31) and a plug (32), and the ring table (31) and the plug (32) are positioned in the transition valve chamber (13); the valve core (3) is arranged in a manner that the valve core can move along the first axial direction through pneumatic control, so that a closed state and an open state of the detection flow channel are constructed; in the closed state, the plug (32) plugs the valve port (12); in the open state, the plug (32) is separated from the valve port (12), and the annular table (31) is attached to the sealing part (22) of the guide sleeve (2) along the first axial direction to form an axial attaching seal.

2. A zero-internal-blow-by control valve according to claim 1, characterized in that the end of the valve core (3) remote from the valve port (12) is provided with a piston portion (33), the piston portion (33) being located in the pneumatic chamber (14) and being driven by a positive and negative external control air source, so that the valve core (3) moves positively and negatively in a first axial direction, and at least one spring (4), the spring (4) acting permanently on the valve core (3) in the first axial direction, so that the valve core (3) obtains a pretension towards the valve port (12) in a near-moving manner.

3. The zero-internal leakage control valve according to claim 1, wherein the valve body (1) is formed by splicing an upper valve body (15) and a lower valve body (16) along a first axial direction, and a detection flow channel is formed on the lower valve body (16); the periphery of the guide sleeve (2) is provided with a radial outwards protruding annular edge (23), the annular edge (23) is embedded at the splicing position of the upper valve body (15) and the lower valve body (16), and static sealing treatment is respectively carried out on the upper side surface and/or the lower side surface of the annular edge (23) and the upper valve body (15) and the lower valve body (16).

4. The zero inner leakage control valve according to claim 1, characterized in that a first sealing ring (51) is embedded between the annular table (31) and the sealing part (22) of the guide sleeve (2), the first sealing ring (51) is positioned on the upper side surface of the annular table (31) facing the sealing part (22), and the first sealing ring (51) is used for establishing an axial fit seal with the sealing part (22) of the guide sleeve (2) in cooperation with the annular table (31).

5. The zero-internal leakage control valve according to claim 1 or 2, wherein the valve element (3) is formed by axially combining an upper valve element and a lower valve element, a ring table (31) and a plug (32) are arranged on the lower valve element, a piston part (33) is arranged on the upper valve element, the piston part (33) abuts against the upper end part of the guide sleeve (2) in a closed state of the detection flow passage, a second sealing ring (52) is embedded between the piston part (33) and the upper end part of the guide sleeve (2), the second sealing ring (52) is positioned on the upper end part of the guide sleeve (2), and the second sealing ring (52) surrounds the through hole (21).

6. A zero inner leakage control valve according to claim 3, wherein the static sealing process comprises embedding a third sealing ring (53) between the upper side surface of the annular rim (23) and the upper valve body (15), and embedding a fourth sealing ring (54) between the lower side surface of the annular rim (23) and the lower valve body (16), wherein the sealing positions of the third sealing ring (53) and the fourth sealing ring (54) form an up-down correspondence.