Pull type safety valve

Abstract

The utility model belongs to the technical field of fluid control, and particularly discloses a pull-type safety valve which comprises a valve body with an inner cavity, and the valve body is provided with a main valve port and a pressure relief port which communicate with the inner cavity; the flexible sealing piece is arranged in the inner cavity and used for achieving disconnection and communication between the main valve port and the pressure relief port. The adjusting piece is used for adjusting the flexible sealing piece in the axial direction of the valve body, the adjusting piece is connected with the flexible sealing piece and can move between a first position and a second position in the axial direction of the inner cavity, when the adjusting piece is located at the first position, the flexible sealing piece cuts off the main valve port and the pressure relief port, and when the adjusting piece moves from the first position to the second position, the main valve port and the pressure relief port are closed. The main valve port and the pressure relief port are disconnected through the flexible sealing piece, so that the main valve port and the pressure relief port are communicated; the elastic piece elastically abuts against the adjusting piece and the valve body, so that the adjusting piece can return to the first position after moving towards the second position. The safety valve is provided with few accessories and has the advantages that faults are not prone to occurring, and interference pressure is not prone to being generated.

Description

Technical Field

[0001] The present application belongs to the field of fluid control technology, and more specifically, relates to a pull-type safety valve. Background Art

[0002] A safety valve is a safety device used to protect equipment or systems. When the medium pressure exceeds the set value, the safety valve opens to release the pressure, ensuring the safe operation of the equipment or system and the life safety of personnel.

[0003] In the related art, the safety valve is assembled from a variety of accessories; to facilitate the operation of the safety valve, a rotatable handle is often installed on the valve body of the safety valve; by turning the knob handle, the inclined platform on the handle lifts the sealing seat in the valve body to achieve active pressure relief of the safety valve.

[0004] However, when using a safety valve with a handle, on the one hand, if the handle or ramp is worn, the friction will increase, causing the handle to get stuck, which can easily cause the safety valve to malfunction. On the other hand, the safety valve usually needs to have a rotation-stopping structure for the sealing seat to prevent the sealing seat from rotating when it is lifted by the ramp; and the rotation-stopping structure will increase the friction of the sealing seat, affecting the pressure relief. This makes the safety valve adjusted by the handle not only prone to malfunction, but also has many accessories and is prone to interference pressure. Utility Model Content

[0005] In response to the defects or improvement needs of the prior art, the present application provides a pull-type safety valve, which aims to improve the problems that the safety valve is prone to failure, has many accessories and is prone to generate interference pressure.

[0006] A pull-type safety valve provided in the present application comprises:

[0007] A valve body with an inner cavity, wherein the valve body has a main valve port and a pressure relief port communicating with the inner cavity;

[0008] a flexible sealing member, disposed in the inner cavity, for cutting off the main valve port and the pressure relief port when pressure relief is not required, and for opening the main valve port so that the main valve port and the pressure relief port are connected when pressure relief is required;

[0009] an adjusting member, used for adjusting the flexible seal member along the axial direction of the valve body, the adjusting member being connected to the flexible seal member and being movable between a first position and a second position in the axial direction of the inner cavity, when the adjusting member is located at the first position, the flexible seal member cuts off the main valve port and the pressure relief port, and when the adjusting member moves from the first position to the second position, the flexible seal member releases the cutoff between the main valve port and the pressure relief port, so that the main valve port and the pressure relief port are connected;

[0010] An elastic member elastically contacts the adjusting member and the valve body, so that the adjusting member can return to the first position after moving to the second position.

[0011] Through the above technical scheme conceived by the present application, compared with the prior art, since one end of the adjusting member always passes through the valve body, when pressure relief is required, the user can pull the adjusting member axially to quickly adjust the adjusting member to the second position, thereby achieving communication between the main valve port and the pressure relief port, and achieving pressure relief of the safety valve; since the safety valve designed under this scheme adopts a pulling structure, accessories such as the ramp and anti-rotation structure in the handle knob type safety valve are omitted. Compared with the handle knob type safety valve, this safety valve is not only not prone to failure, but also has fewer accessories and is not prone to interference pressure.

[0012] As further preferred, the flexible seal includes: a sealing portion for cutting off the main valve port and the pressure relief port, a first flange portion for forming a connection with the valve body, and a flexible connecting portion for connecting the sealing portion and the first flange portion.

[0013] As a further preferred embodiment, a first protrusion is formed on the inner wall of the main valve port along the circumferential direction, and the first protrusion is located between the main valve port and the pressure relief port. When the adjusting member is in the first position, an interference seal is formed between the first protrusion and the sealing portion to cut off the main valve port 10 and the pressure relief port.

[0014] As further preferred, a first groove is provided on the end surface of the sealing portion, and when the adjusting member is in the first position, the first protrusion abuts against the first groove.

[0015] As further preferred, the adjusting member is adapted to be coupled to the flexible connecting portion.

[0016] As further preferred, the first flange portion forms a sealing connection with the valve body along the circumference of the inner wall of the valve body.

[0017] As a further preference, the valve body includes a main body and a valve cover, the main body having an installation port for installing the adjusting member and the flexible sealing member; the valve cover is detachably connected to the main body at the installation port, and can confine the adjusting member and the flexible sealing member between the valve cover and the main body.

[0018] As further preferred, when the main body and the valve cover are connected to each other, a clamping cavity for clamping the first flange portion is formed at a junction of the main body and the valve cover.

[0019] As further preferred, a locking protrusion is provided on the inner wall of the clamping cavity, and when the first flange portion is clamped, the locking protrusion prevents the first flange portion from escaping from the clamping cavity.

[0020] As a further preference, the adjusting member is provided with a handle portion, and the handle portion always passes through the valve body.

[0021] In general, the above technical solutions conceived by this application have the following technical advantages compared with the prior art:

[0022] 1. When pressure relief is required, the user can pull the adjusting piece axially to quickly adjust the adjusting piece to the second position to achieve communication between the main valve port and the pressure relief port, that is, to achieve pressure relief of the safety valve; on the basis of ensuring the original pressure relief function of the safety valve, this design omits accessories such as the inclined platform and the anti-rotation structure in the handle knob type safety valve, so that the safety valve of this design is not only not prone to failure, but also has fewer accessories and is not prone to interference pressure.

[0023] 2. The flexible seal is composed of a sealing portion, a first flange portion and a flexible connecting portion. It can not only realize the on-off adjustment between the main valve port and the pressure relief port, but also separate the inner cavity of the valve body, so that other functional components in the safety valve (such as adjusting parts, elastic parts) remain independent of the main valve port and the pressure relief port, so as to avoid the medium in the safety valve from corroding the built-in functional components of the safety valve, thereby effectively extending the service life of the safety valve.

[0024] 3. By disassembling the main body and the valve cover, the adjustment part, the elastic part and the flexible sealing part can be installed or replaced, so that the assembly operation of the safety valve is convenient and the internal components of the valve body can be easily replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the pull-type safety valve provided in the embodiment of the present application;

[0026] Figure 2 is a schematic cross-sectional structural diagram of a pull-type safety valve provided in an embodiment of the present application when the adjusting member is in a first position;

[0027] Figure 3 is a schematic cross-sectional structural diagram of a pull-type safety valve provided in an embodiment of the present application when the adjusting member is in the second position;

[0028] Figure 4 is an exploded view of a pull-type safety valve provided in an embodiment of the present application;

[0029] Figure 5 is a schematic cross-sectional structural diagram of a flexible seal provided in an embodiment of the present application;

[0030] Figure 6 yes Figure 3 The enlarged view of point A in the middle;

[0031] Figure 7 is a schematic cross-sectional structural diagram of an adjusting member provided in an embodiment of the present application;

[0032] Figure 8 1 is a cross-sectional view showing the cover body and the adjustment part of the valve cover provided in an embodiment of the present application. In all the drawings, the same reference numerals are used to represent the same elements or structures, wherein:

[0033] 1. Valve body; 1-1. Main body; 1-2. Valve cover; 1-21. Cover body; 1-22. Adjustment part; 2. Adjustment member; 2-1. Rod; 2-2. End head; 2-3. Second flange; 2-4. Handle; 3. Flexible sealing member; 3-1. Sealing part; 3-2. Flexible connection part; 3-3. First flange; 4. Elastic member; 5. First protrusion; 6. Second protrusion; 7. External structure; 10. Main valve port; 20. Pressure relief port; 30. Installation port; 40. Perforation; 50. First groove; 60. Second groove; 70. Sink. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] The following is combined with Figure 1-8 This application is described in further detail.

[0036] The present application embodiment discloses a pull-type safety valve. Figure 1-3 The pull-type safety valve comprises a valve body 1 , an adjusting member 2 , a flexible sealing member 3 and an elastic member 4 . Among them, the valve body 1 has an inner cavity, and the valve body 1 has a main valve port 10 and a pressure relief port 20 connected with the inner cavity; the flexible seal 3 is arranged in the inner cavity, and the flexible seal 3 is used to cut off the main valve port 10 and the pressure relief port 20 when pressure relief is not required, and to open the main valve port 10 when pressure relief is required, so that the main valve port 10 and the pressure relief port 20 are connected; the adjusting member 2 is used to adjust the flexible seal 3 along the axial direction of the valve body 1, and the adjusting member 2 is connected to the flexible seal 3, and can move between the first position and the second position of the axial direction of the inner cavity. When the adjusting member 2 is in the first position, the flexible seal 3 cuts off the main valve port 10 and the pressure relief port 20. When the adjusting member 2 moves from the first position to the second position, the flexible seal 3 releases the cutoff between the main valve port 10 and the pressure relief port 20, so that the main valve port 10 and the pressure relief port 20 are connected; the elastic member 4 elastically resists the adjusting member 2 and the valve body 1, so that the adjusting member 2 can return to the first position after moving to the second position.

[0037] Further, see Figure 2-4 To facilitate the assembly of the safety valve, the valve body 1 in the safety valve includes a main body 1-1 and a valve cover 1-2. The relevant pressure relief port 20 and the main valve port 10 are both arranged on the main body 1-1, and the main body 1-1 also has an installation port 30 for installing the adjusting member 2 and the flexible sealing member 3. The valve cover 1-2 is located at the installation port 30 and is detachably connected to the main body 1-1. The valve cover 1-2 also has a through hole 40 for one end of the adjusting member 2 to pass through. After the valve cover 1-2 is assembled on the main body 1-1, the adjusting member 2 and the flexible sealing member 3 will be confined between the valve cover 1-2 and the main body 1-1, and together form a stable safety valve.

[0038] It should be noted that the assembly methods between the main body 1-1 and the valve cover 1-2 include but are not limited to threaded installation, screw installation, snap-on installation, etc. For ease of understanding, Figure 2 A threaded installation method is shown to achieve detachable installation of the main body 1-1 and the valve cover 1-2.

[0039] Further, such as Figure 2-3 As shown, the main body 1-1 is formed with a first protrusion 5 protruding along the circumferential direction at the inner wall of the main valve port 10, and the first protrusion 5 is located between the main valve port 10 and the pressure relief port 20. When the adjusting member 2 is in the first position, a contact seal is formed between the first protrusion 5 and the adjusting member 2, so that the main valve port 10 and the pressure relief port 20 are cut off. When the adjusting member 2 is in the second position, the first protrusion 5 is separated from the adjusting member 2, so that the main valve port 10 and the pressure relief port 20 are connected.

[0040] It should be noted that the contact seal formed between the first protrusion 5 and the adjusting member 2 may be an end face seal, a circumferential seal, or the like.

[0041] Further, such as Figure 5 As shown, the flexible sealing member 3 includes a sealing portion 3-1, a flexible connecting portion 3-2 and a first flange portion 3-3 which are connected in sequence. The sealing portion 3-1 is used to cut off the main valve port 10 and the pressure relief port 20. The first flange portion 3-3 is used to form a connection with the valve body 1. The flexible connecting portion 3-2 can be bent during use.

[0042] When the sealing part 3-1 and the first protrusion 5 adopt the end face sealing form, the sealing part 3-1 is away from the boss set at the center of the end face of the adjusting member 2, and the end face of the sealing part 3-1 is provided with a first groove 50, which is preferably an annular groove, and the annular groove is centered on the boss. When the adjusting member 2 is in the first position, the first protrusion 5 contacts the first groove 50 to form a stable end face seal.

[0043] Furthermore, when the main body 1-1 and the valve cover 1-2 are connected to each other, a clamping cavity for clamping the first flange portion 3-3 of the flexible seal 3 is formed at the joint of the main body 1-1 and the valve cover 1-2. When the main body 1-1 and the valve cover 1-2 are assembled and locked with each other, the main body 1-1 and the valve cover 1-2 clamp the first flange portion 3-3 of the flexible seal 3, thereby realizing the connection between the main body 1-1, the valve cover 1-2 and the flexible seal 3.

[0044] Further, such as Figure 6 As shown, a locking protrusion 70 is provided in the clamping cavity, and the locking protrusion 70 is preferably an annular protrusion, and the locking protrusion 70 is preferably integrally formed at the edge of the inner step surface of the main body 1-1. In addition, a groove for the locking protrusion 70 to engage is correspondingly provided on the surface of the first flange portion 3-3. When the first flange portion 3-3 is clamped, the locking protrusion 70 and the first flange portion 3-3 engage with each other to prevent the first flange portion 3-3 from escaping from the clamping cavity.

[0045] In addition, under this design, when the main body 1-1 and the valve cover 1-2 are connected to each other, since the first flange portion 3-3 forms a sealed connection with the valve body 1 along the circumference of the inner wall of the valve body 1, other functional components in the safety valve (such as the adjusting member 2, the elastic member 4) and the main valve port 10 and the pressure relief port 20 remain independent and separated from each other, so as to avoid the medium in the safety valve from corroding the built-in functional components of the safety valve, which effectively extends the service life of the safety valve.

[0046] It should be noted that, in other embodiments, the flexible sealing member 3 and the valve body 1 may be connected by threaded connection or other detachable connection methods.

[0047] Further, such as Figure 7 As shown, the adjusting member 2 includes a rod portion 2-1, an end portion 2-2, a second flange portion 2-3 and a handle portion 2-4. The rod portion 2-1 is arranged along the axial direction of the valve body 1, and one end thereof close to the main valve port 10 is integrally connected to the end portion 2-2, and the other end is integrally connected to the handle portion 2-4. In addition, the second flange portion 2-3 is connected to the circumferential edge of the end portion 2-2 and extends in a direction away from the main valve port 10, so that a receiving cavity for accommodating the elastic member 4 can be formed between the second flange portion 2-3, the end portion 2-2 and the rod portion 2-1. The circumferential surface of the handle portion 2-4 has a third groove for facilitating the user to pull out the handle portion 2-4. In other embodiments, the third groove can also be replaced by a structure such as a thread, a protrusion, a stripe, etc. It should be noted that when the safety valve is assembled, the handle portion 2-4 always passes through the valve body 1.

[0048] Further, the adjusting member 2 is adapted to be coupled to the flexible connection portion 3-2. Preferably, the circumferential surface of one of the flexible connection portion 3-2 and the adjusting member 2 is provided with a second protrusion 6, and the other of the flexible connection portion 3-2 and the adjusting member 2 is provided with a second groove 60 for the second protrusion 6 to be embedded.

[0049] Preferably, a second groove 60 is provided in the circumferential direction of the end portion 2 - 2 of the adjusting member 2 , and a second protrusion 6 is formed by protruding from the inner side of the flexible connecting portion 3 - 2 of the flexible sealing member 3 .

[0050] It should be noted that when assembling the safety valve, first install the flexible seal 3 into the main body 1-1 along the installation opening 30 of the main body 1-1, and then install the adjusting member 2 into the main body 1-1 along the installation opening 30, so that the second groove 60 on the adjusting member 2 and the second protrusion 6 between the flexible seal 3 form an assembly relationship. Then install the elastic member 4 so that the elastic member 4 contacts the adjusting member 2; then thread the valve cover 1-2 onto the main body 1-1, so that the first flange portion 3-3 of the flexible seal 3 is pressed and locked at the junction of the main body 1-1 and the valve cover 1-2, and the end of the elastic member 4 away from the flexible seal 3 contacts the inner wall of the valve cover 1-2, so that the handle portion 2-4 in the adjusting member 2 is located outside the valve cover 1-2, thereby completing the assembly. When the user needs to actively relieve the pressure of the safety valve, he only needs to pull the handle portion 2-4 of the adjusting member 2 axially to achieve active pressure relief.

[0051] Furthermore, in order to facilitate the installation of the safety valve into the fluid system, Figure 1 As shown, the valve body 1 is provided with an annular groove along the circumferential direction at the outer end of the main valve port 10, and a plurality of annular grooves are provided at intervals along the axial direction of the valve body 1. In addition, the valve body 1 is provided with an external connection structure 7 at the outer end of the pressure relief port 20 for connecting an external extension component.

[0052] In this embodiment, the external structure 7 is an external thread arranged on the outer periphery of the valve body 1. In other embodiments, the external structure 7 can be a flange, or other connection structure that can form a connection relationship between the valve body 1 and the external extension component.

[0053] It should be noted that, in some embodiments, some accessories in the pull-type safety valve can be made of materials such as plastic, brass, etc. For example, the valve body 1 can be made of brass, plastic, etc., and the regulating member 2 can be made of plastic.

[0054] In addition, if Figure 8 As shown, in some other embodiments, the valve cover 1-2 in the valve body 1 includes a cover body portion 1-21 and an adjusting portion 1-22, and a threaded hole is provided at the center of the end surface of the cover body portion 1-21. The adjusting portion 1-22 is threadedly connected to the cover body portion 1-21 along the threaded hole, and the adjusting portion 1-22 can be spirally displaced along the axial direction on the cover body portion 1-21.

[0055] In addition, the perforation 40 in the valve cover 1-2 is located on the adjusting part 1-22, and the adjusting part 2 and the elastic part 4 both interfere with the adjusting part 1-22. During use, the user can adjust the compression degree of the elastic part 4 by spirally adjusting the position of the adjusting part 1-22 to actively adjust the pressure relief threshold of the safety valve.

[0056] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations or constituent elements, and do not limit one or more additional functions, operations and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components or combinations thereof.

[0057] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0059] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A pull-type safety valve, characterized in that: include: A valve body (1) with an inner cavity, the valve body (1) having a main valve port (10) and a pressure relief port (20) in communication with the inner cavity; a flexible sealing member (3) disposed in the inner cavity, and used for cutting off the main valve port (10) and the pressure relief port (20) when pressure relief is not required, and for opening the main valve port (10) when pressure relief is required, so that the main valve port (10) and the pressure relief port (20) are in communication; an adjusting member (2) for adjusting the flexible sealing member (3) along the axial direction of the valve body (1); the adjusting member (2) is connected to the flexible sealing member (3) and can move between a first position and a second position in the axial direction of the inner cavity; when the adjusting member (2) is located at the first position, the flexible sealing member (3) cuts off the main valve port (10) and the pressure relief port (20); when the adjusting member (2) moves from the first position to the second position, the flexible sealing member (3) releases the cutoff between the main valve port (10) and the pressure relief port (20), so that the main valve port (10) and the pressure relief port (20) are connected; wherein the adjusting member (2) is provided with a handle portion (2-4), and the handle portion (2-4) always passes through the valve body (1); An elastic member (4) elastically contacts the adjusting member (2) and the valve body (1), so that the adjusting member (2) can return to the first position after moving to the second position.

2. The pull-type safety valve according to claim 1, characterized in that: The flexible sealing member (3) comprises: a sealing portion (3-1) for cutting off the main valve port (10) and the pressure relief port (20), a first flange portion (3-3) for forming a connection with the valve body (1), and a flexible connecting portion (3-2) for connecting the sealing portion (3-1) and the first flange portion (3-3).

3. The pull-type safety valve according to claim 2, characterized in that: A first protrusion (5) is formed on the inner wall of the main valve port (10) in a circumferentially protruding manner. The first protrusion (5) is located between the main valve port (10) and the pressure relief port (20). When the regulating member (2) is in the first position, a contact seal is formed between the first protrusion (5) and the sealing portion (3-1) to cut off the main valve port (10) and the pressure relief port (20).

4. The pull-type safety valve according to claim 3, characterized in that: The end surface of the sealing portion (3-1) is provided with a first groove (50), and when the adjusting member (2) is in the first position, the first protrusion (5) abuts against the first groove (50).

5. The pull-type safety valve according to claim 2, characterized in that: The adjusting member (2) is adapted to be coupled to the flexible connecting portion (3-2).

6. The pull-type safety valve according to claim 2, characterized in that: The first flange portion (3-3) forms a sealed connection with the valve body (1) along the circumference of the inner wall of the valve body (1).

7. The pull-type safety valve according to claim 2, characterized in that: The valve body (1) comprises a main body (1-1) and a valve cover (1-2); the main body (1-1) has a mounting opening (30) for mounting the adjusting member (2) and the flexible sealing member (3); The valve cover (1-2) is detachably connected to the main body (1-1) at the installation opening (30), and is capable of confining the adjustment member (2) and the flexible sealing member (3) between the valve cover (1-2) and the main body (1-1).

8. The pull-type safety valve according to claim 7, characterized in that: When the main body (1-1) and the valve cover (1-2) are connected to each other, a clamping cavity for clamping the first flange portion (3-3) is formed at the junction of the main body (1-1) and the valve cover (1-2).

9. The pull-type safety valve according to claim 8, characterized in that: A locking protrusion is provided on the inner wall of the clamping cavity, and when the first flange portion (3-3) is clamped, the locking protrusion prevents the first flange portion (3-3) from escaping from the clamping cavity.

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