Pressure release valve

Abstract

The utility model relates to a pressure release valve. The pressure release valve comprises a valve body, a valve rod, a valve seat, a valve element, a reset driving piece and a control assembly. The valve body is hollow to form a valve cavity communicated with two ends; the valve rod is arranged in the valve cavity in a penetrating mode and can move in the axial direction. The valve seat is arranged on the outer side of the valve body and fixedly connected with one end of the valve body, the valve element is fixed to the valve rod, the valve seat comprises a first bottom and an annular adjusting part connected with the outer edge of the first bottom, a through hole communicated with the valve cavity is formed in the first bottom, and when the valve element is located at the closed position, the valve element is tightly attached to the first bottom to seal an opening in one end of the valve cavity; the circumferential edge of the valve element is matched with the inner wall of the annular adjusting part, an air inlet hole is formed in the side wall of the annular adjusting part, and in the process that the valve element moves in the direction away from the first bottom, the minimum cross sectional area, located at the air inlet hole, of the medium flow channel is gradually increased. And the pressure release valve realizes the adjustment of the pressure release speed by adjusting the position of the valve core relative to the valve seat. The method is easy to operate and suitable for scenes in urgent need of emergency pressure relief.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure relief valve technical field, concretely relates to a kind of manually operated pressure relief valve. BACKGROUND

[0002] Oxygen cabin is a kind of pure oxygen and purified compressed air input, form more than one atmospheric pressure oxygen-rich environment inside cabin equipment, for example, domestic micro high pressure oxygen cabin cabin pressure is about 1.1-1.3 atmospheric pressure around. User can improve human blood oxygen content by breathing high concentration of oxygen in oxygen cabin.

[0003] The manual pressure relief valve (emergency pressure relief valve) currently applied to oxygen cabin is mainly designed as screwing type, i.e. rotation operation mechanism is needed to realize the opening and closing of the manual pressure relief valve, and there is the problem of inconvenient operation in the scene of urgent emergency relief. UTILITY MODEL CONTENTS

[0004] In view of the above problems, the utility model is proposed to provide a pressure relief valve to overcome the above problems or at least partially solve the above problems.

[0005] The pressure relief valve includes a valve body, a valve stem, a valve seat, a valve core, a reset driving element and a control assembly. The valve body is hollow and has a valve cavity communicating between two ends. The valve stem is arranged in the valve cavity and can move axially. The valve seat is arranged on the outside of the valve body and is fixedly connected to one end of the valve body. The valve core is fixed to the valve stem. The valve seat includes a first bottom and an annular adjusting portion connected to the outer edge of the first bottom. The first bottom has a through hole communicating with the valve cavity. When the valve core is in the closed position, it tightly fits the first bottom to close the opening of one end of the valve cavity. The circumferential edge of the valve core cooperates with the inner wall of the annular adjusting portion. The side wall of the annular adjusting portion has an air inlet hole. During the movement of the valve core away from the first bottom, the minimum cross-sectional area of the medium flow passage containing the air inlet hole and the valve cavity gradually increases at the air inlet hole. The reset driving element is used to move the valve core towards the closed position and stay in the closed position. The control assembly is installed at both ends of the valve stem.

[0006] In one embodiment, the inner wall of the valve cavity has an annular positioning groove, and the valve stem is provided with a positioning bead. When the valve core is in the fully open position away from the first bottom, the positioning bead extends into the annular positioning groove.

[0007] In one embodiment, the valve stem comprises a first stem body and a second stem body fixedly connected together, both of which extend into the valve cavity; the valve core is fixed to the first stem body; the operating assembly comprises a pulling operating element and a pressing operating element, the pulling operating element is fixedly connected to one end of the first stem body outside the valve body, and the pressing operating element is fixedly connected to one end of the second stem body outside the valve body; pulling the pulling operating element or pressing the pressing operating element can drive the valve core to move away from the first bottom.

[0008] In one embodiment, the second stem body cooperates with the inner wall of the valve cavity, and the second stem body is formed with an exhaust passage in communication with the valve cavity and the outside of the valve body.

[0009] In one embodiment, one end of the valve body away from the valve seat is fixedly connected with a limiting seat, the second bottom of the limiting seat is formed with a through hole in communication with the valve cavity, and the pressing operating element abuts against the limiting seat when the valve core is in the fully open position away from the first bottom.

[0010] In one embodiment, the side wall of the limiting seat is formed with an exhaust hole in communication with the exhaust passage.

[0011] In one embodiment, the outside of the valve body is provided with a first blocking ring and a second blocking ring surrounding the peripheral wall of the valve body, and the first blocking ring and the second blocking ring can jointly abut against the wall body located therebetween.

[0012] In one embodiment, the valve body comprises a valve body main body and a locking sleeve, the peripheral wall of the valve body main body is formed with external threads, and the inner peripheral wall of the locking sleeve is formed with internal threads matched with the external threads of the peripheral wall of the valve body main body; the first blocking ring is arranged on the peripheral wall of the valve body main body, and the second blocking ring is arranged on the peripheral wall of the locking sleeve; the valve seat is fixed to the valve body main body, and the limiting seat is fixed to the locking sleeve.

[0013] In one embodiment, the first bottom is provided with a sealing ring on the side facing the valve core.

[0014] In one embodiment, the reset driving member is a spring arranged in the valve cavity and abutting against the valve body and the valve stem at both ends.

[0015] In the pressure relief valve, the "minimum cross-sectional area of medium flow" during the process that the high-pressure medium flows through the inlet hole is the minimum cross-sectional area of the medium flow channel, and the pressure relief speed is adjusted by adjusting the position of the valve core relative to the valve seat. The operation is simple, and is suitable for scenes urgently requiring emergency pressure relief, such as oxygen cabins. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0017] Figure 1 It is a front view of an exemplary embodiment of the pressure relief valve of the present application;

[0018] Figure 2 It is a right view of the pressure relief valve;

[0019] Figure 3 It is an A-A sectional view of the pressure relief valve (the pressure relief valve is in a closed state);

[0020] Figure 4 It is a sectional view of the pressure relief valve (the pressure relief valve is in a closed state);

[0021] Figure 5 It is an A-A perspective sectional view of the pressure relief valve (the pressure relief valve is in a pressure relief (open) state);

[0022] Figure 6 It is a perspective sectional view of the pressure relief valve (the pressure relief valve is in a pressure relief (open) state);

[0023] Figure 7 It is a combined schematic view of the valve rod, valve core and control assembly.

[0024] The reference signs are as follows: 1, valve body; 2, valve rod; 3, valve seat; 4, valve core; 5, reset driving member; 6, first bottom; 7, annular adjusting part; 8, sealing ring; 9, air inlet hole; 10, pull-type control; 11, press-type control; 12, first rod body; 13, second rod body; 14, exhaust passage; 15, limiting seat; 16, second bottom; 17, exhaust hole; 18, annular positioning groove; 19, positioning bead; 20, first blocking ring; 21, second blocking ring; 22, valve body main body; 23, locking sleeve; 30, wall body. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application, and those skilled in the art can make various changes, modifications, replacements and variations to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

[0026] In the description of the utility model, the terms "center", "longitudinal", "lateral", "length", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0027] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In addition, the terms "include", "contain" and any variations thereof are intended to cover non-exclusive inclusion.

[0028] In the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] A pressure relief valve according to an embodiment of the utility model will be described below with reference to the drawings.

[0030] Referring to Figures 1 to 6 , a pressure relief valve according to an embodiment of the utility model comprises a valve body 1, a valve rod 2, a valve seat 3, a valve core 4, a reset driving element 5 and a control assembly.

[0031] The valve body 1 is hollowly formed with a valve cavity communicating between two ends. The valve rod 2 is arranged in the valve cavity and can move in the axial direction, referring to Figure 3 The angle of view, that is, the valve rod 2 can move left and right under the action of external force. The valve seat 3 is arranged on the outer side of the valve body 1 and fixedly connected with one end of the valve body 1. The valve core 4 is fixed on the valve rod 2, the valve seat 3 comprises a first bottom 6 and an annular adjusting part 7 connected with the outer edge of the first bottom 6, the first bottom 6 is formed with a through hole communicating with the valve cavity, and the valve core 4 is tightly attached to the first bottom 6 to close the opening of one end of the valve cavity when the valve core 4 is in the closed position, as shown in Figure 3 and Figure 4 At this time, the pressure relief valve is in the closed state. Optionally, the first bottom 6 is provided with a sealing ring 8 on the side facing the valve core 4.

[0032] The circumferential edge of the valve core 4 cooperates with the inner wall of the annular adjusting portion 7, the side wall of the annular adjusting portion 7 is formed with the air inlet hole 9, and the minimum cross-sectional area of the medium flow channel containing the air inlet hole 9 and the valve cavity gradually increases during the movement of the valve core 4 away from the first bottom 6. In practical application, the area where the valve seat 3 is located is a "high pressure area", and the high pressure medium (gas or liquid) can enter the valve seat 3 through the air inlet hole 9 and make the valve core 4 tightly fit the first bottom 6, further avoiding leakage. Referring to Figure 3 Viewing from the perspective, when a leftward force is applied to the valve rod 2, such as pulling the valve rod 2 at the left side of the pressure relief valve or pushing the valve rod 2 at the right side of the pressure relief valve, the valve core 4 moves to the left side. During the movement of the valve core 4 to the left side, it gradually moves away from the first bottom 6, and because the circumferential edge of the valve core 4 cooperates with the inner wall of the annular adjusting portion 7, the high pressure medium cannot enter the valve cavity through the gap between the valve core 4 and the inner wall of the annular adjusting portion 7, or only a small amount of high pressure medium enters the valve cavity through the gap between the valve core 4 and the inner wall of the annular adjusting portion 7, and the high pressure medium or most of the high pressure medium enters the area surrounded by the valve core 4 and the valve seat 3 through the air inlet hole 9 of the side wall of the annular adjusting portion 7, and then enters the valve cavity. The total cross-sectional area of the air inlet hole 9 is less than or equal to the cross-sectional area of the remaining sections of the medium flow channel containing the air inlet hole 9 and the valve cavity except the air inlet hole 9 section, so the "minimum cross-sectional area of medium flow" during the flow of the high pressure medium through the air inlet hole 9 is the minimum cross-sectional area of the medium flow channel. During the movement of the valve core 4 to the left side, the "minimum cross-sectional area of medium flow" during the flow of the high pressure medium through the air inlet hole 9 gradually increases, that is, the minimum cross-sectional area of the medium flow channel gradually increases. Thus, the position of the valve core 4 relative to the valve seat 3 can be adjusted to adjust the pressure relief speed, and further adjust the medium pressure in the "high pressure area", such as adjusting (reducing) the air pressure in the "high pressure area".

[0033] It should be understood that when the number of air inlet holes 9 is 1, the total cross-sectional area of the air inlet hole 9 is the cross-sectional area of a single air inlet hole 9, and when the number of air inlet holes 9 is N, the total cross-sectional area of the air inlet hole 9 is the cross-sectional area of N air inlet holes 9.

[0034] The reset drive 5 is used to make the valve core 4 move towards the closed position and stay in the closed position. In an embodiment, the reset drive 5 can be a spring arranged in the valve cavity and abutting against the valve body 1 and the valve rod 2 at both ends. Referring to Figure 3 Viewing from the perspective, the reset drive 5 provides a rightward force to the valve core 4 to make the valve core 4 move to the right and stay in the closed position.

[0035] The operation assembly is installed on both ends of the valve rod 2, and axial force is applied to the operation assembly, so that the valve rod 2 is moved in the axial direction, and the position of the valve core 4 is changed. In an embodiment, the operation assembly includes a pulling operation component 10 and a pressing operation component 11, which are respectively installed on both ends of the valve rod 2. Specifically, the pulling operation component 10 is installed on one end of the valve rod 2 close to the valve seat 3, and the pressing operation component 11 is installed on the other end of the valve rod 2 away from the valve seat 3. In actual application, the pulling operation component 10 is in a “high-pressure area”, and the pressing operation component 11 is in a “low-pressure area”. Pulling the pulling operation component 10 or pressing the pressing operation component 11 can move the valve core 4 away from the first bottom 6, which is easy to operate and suitable for scenes requiring emergency pressure relief, such as oxygen cabins.

[0036] In order to facilitate the installation of the valve rod 2, the valve rod 2 can include a first rod body 12 and a second rod body 13 fixedly connected together. For example, the first rod body 12 and the second rod body 13 are fixedly connected in a threaded connection manner. Specifically, an outer peripheral wall of one end of the first rod body 12 is formed with external threads, and one end of the second rod body 13 is formed with a threaded hole. The first rod body 12 and the second rod body 13 both extend into the valve cavity, and the valve core 4 is fixed to the first rod body 12.

[0037] The pulling operation component 10 is fixedly connected to one end of the first rod body 12 located outside the valve body 1, and the pressing operation component 11 is fixedly connected to one end of the second rod body 13 located outside the valve body 1. Pulling the pulling operation component 10 or pressing the pressing operation component 11 can move the valve core 4 away from the first bottom 6. Preferably, the pressing operation component 11 and the pulling operation component 10 both adopt a mushroom-shaped structure.

[0038] The second rod body 13 cooperates with the inner wall of the valve cavity to enable the valve rod 2 to move smoothly. The second rod body 13 is formed with an exhaust passage 14 which communicates with the valve cavity and the outside of the valve body 1, and the exhaust passage 14 also serves as part of the medium flow channel. In an embodiment, the exhaust passage 14 can be a long strip-shaped groove formed in the axial direction on the outer peripheral wall of the second rod body 13.

[0039] One end of the valve body 1 away from the valve seat 3 can be fixed with a limiting seat 15, and a second bottom 16 of the limiting seat 15 is formed with a through hole which communicates with the valve cavity. When the valve core 4 is in a fully open position away from the first bottom 6, the pressing operation component 11 abuts against the limiting seat 15.

[0040] The side wall of the limiting seat 15 can be formed with an exhaust hole 17 which communicates with the exhaust passage 14. The exhaust hole 17 can reduce the force of the high-pressure medium acting on the pressing operation component 11 during the “pressure relief” process.

[0041] In this embodiment, the inner wall of the valve cavity is formed with an annular positioning groove 18, the valve stem 2 is provided with a positioning ball 19, and when the valve core 4 is in the fully open position away from the first bottom 6, the positioning ball 19 extends into the annular positioning groove 18. Thus, when the pressure relief valve is in the fully open state, the positioning of the valve core 4 is fixed by the cooperation of the positioning ball and the annular positioning groove 18, that is, the pressure relief valve is maintained in the fully open state without the need to hold the pull-type control 10 or press the press-type control 11 by hand.

[0042] In order to facilitate the installation of the pressure relief valve on the wall 30 of the oxygen cabin or the wall 30 of other devices, the outer side of the valve body 1 can be provided with a first stop ring 20 and a second stop ring 21 surrounding the outer peripheral wall of the valve body 1, and the first stop ring 20 and the second stop ring 21 can jointly abut against the wall 30 located therebetween.

[0043] Specifically, the valve body 1 comprises a valve body main body 22 and a locking sleeve 23, the outer peripheral wall of the valve body main body 22 is formed with external threads, and the inner peripheral wall of the locking sleeve 23 is formed with internal threads matched with the external threads of the outer peripheral wall of the valve body main body 22. The first stop ring 20 is arranged on the outer peripheral wall of the valve body main body 22, and the second stop ring 21 is arranged on the outer peripheral wall of the locking sleeve 23. The valve seat 3 is fixed to the valve body main body 22, and the limiting seat 15 is fixed to the locking sleeve 23.

Claims

1. A pressure relief valve, characterized in that: The valve includes a valve body, valve stem, valve seat, valve core, reset drive, and control assembly. The valve body is hollow and forms a valve cavity connecting both ends. The valve stem passes through the valve cavity and is axially movable. The valve seat is located on the outside of the valve body and is fixedly connected to one end of the valve body. The valve core is fixed to the valve stem. The valve seat includes a first bottom and an annular adjusting portion connected to the outer edge of the first bottom. The first bottom has a through hole communicating with the valve cavity. When the valve core is in the closed position, it fits tightly with the first bottom to close the opening at one end of the valve cavity. The circumferential edge of the valve core cooperates with the inner wall of the annular adjusting portion. The side wall of the annular adjusting portion forms an air inlet hole. As the valve core moves away from the first bottom, the minimum cross-sectional area of ​​the medium flow channel, including the air inlet hole and the valve cavity, located at the air inlet hole gradually increases. The reset drive is used to move the valve core towards the closed position and keep it in the closed position. The control assembly is installed at both ends of the valve stem.

2. The pressure relief valve according to claim 1, characterized in that: The valve cavity has an annular positioning groove formed on its inner wall, and the valve stem is provided with a positioning bead. When the valve core is in the fully open position away from the first bottom, the positioning bead extends into the annular positioning groove.

3. The pressure relief valve according to claim 1, characterized in that: The valve stem includes a first rod body and a second rod body fixedly connected together, both of which extend into the valve cavity; the valve core is fixed to the first rod body; the control assembly includes a pull-type control element and a press-type control element; the pull-type control element is fixedly connected to one end of the first rod body located outside the valve body, and the press-type control element is fixedly connected to one end of the second rod body located outside the valve body; pulling the pull-type control element or pressing the press-type control element can cause the valve core to move away from the first bottom.

4. The pressure relief valve according to claim 3, characterized in that: The second rod fits into the inner wall of the valve cavity, and the second rod forms an exhaust channel that communicates with the valve cavity and the outside of the valve body.

5. The pressure relief valve according to claim 4, characterized in that: A limiting seat is fixed at one end of the valve body away from the valve seat. A through hole communicating with the valve cavity is formed at the second bottom of the limiting seat. When the valve core is in the fully open position away from the first bottom, the push-type control member abuts against the limiting seat.

6. The pressure relief valve according to claim 5, characterized in that: The side wall of the limiting seat has an exhaust hole, which is connected to the exhaust channel.

7. The pressure relief valve according to claim 5, characterized in that: The valve body is provided with a first retaining ring and a second retaining ring surrounding the outer peripheral wall of the valve body, and the first retaining ring and the second retaining ring can jointly abut against the wall located between them.

8. The pressure relief valve according to claim 7, characterized in that: The valve body includes a valve body main body and a locking sleeve. The outer peripheral wall of the valve body main body has an external thread, and the inner peripheral wall of the locking sleeve has an internal thread that mates with the external thread of the outer peripheral wall of the valve body main body. The first retaining ring is disposed on the outer peripheral wall of the valve body main body, and the second retaining ring is disposed on the outer peripheral wall of the locking sleeve. The valve seat is fixed to the valve body main body, and the limiting seat is fixed to the locking sleeve.

9. The pressure relief valve according to claim 1, characterized in that: A sealing ring is provided on the side of the first bottom facing the valve core.

10. The pressure relief valve according to any one of claims 1 to 9, characterized in that: The reset drive component is a spring, which is arranged inside the valve cavity, with its two ends abutting against the valve body and the valve stem, respectively.

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