Breathing type safety relief valve

Abstract

According to the breathing type safety relief valve provided by the invention, through the structural design of an air channel flow channel and a valve body, an independent'rubber valve + metal cutting edge 'end face sealing structure is designed in the small safety relief valve body, and the negative pressure air inlet function and the positive pressure exhaust function under different pressure indexes are met respectively; the valve is opened in an involute mode, breathable pressure relief is achieved, and pressure stability is guaranteed; the sealing mode of the valve is end face sealing, abrasion of a sealing pair is small during long-term reciprocating work, and the service life of a product is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure relief valves, and in particular relates to a breathing type safety pressure relief valve. Background Art

[0002] The breathing safety pressure relief valve is a fuel system accessory used in the engine ventilation and boosting unit to ensure that the fuel tank pressure is within the required range.

[0003] A certain type of safety pressure relief valve is used in the aircraft ventilation and pressurization unit to ensure the stability of the fuel tank pressure. When the pressure in the fuel tank is lower than the negative pressure intake pressure, the atmosphere enters the fuel tank; when the pressure in the fuel tank is higher than the positive pressure exhaust pressure, the air in the fuel tank is discharged.

[0004] In this structure, after the pressure in the oil tank reaches the specified value, the valve port flow channel of the pressure relief valve is instantly fully opened, and the stability of the outlet pressure is poor when the valve suddenly releases pressure; at the same time, the moving parts use O-ring dynamic sealing, and the surface wears after long-term reciprocating work, and the valve sealing performance decreases. Summary of the invention

[0005] The invention provides a breathing type safety pressure relief valve, which improves the valve structure and realizes the functions of gradual opening of the valve port and stable pressure relief; and adopts the end face sealing mode of a rubber valve and a metal cutting edge to increase the service life.

[0006] The present invention provides a breathing type safety pressure relief valve, comprising: an air outlet nozzle 2, a valve port I3, a valve I4, a valve body 6, a valve II8, a valve port II9, an air inlet nozzle 10, a flow channel II13, and a flow channel I14;

[0007] The air outlet nozzle 2 and the air inlet nozzle 10 are installed on the front and rear sides of the valve body 6 through threaded connection;

[0008] A partition is provided in the middle of the valve body 6 to divide the valve body 6 into two front and rear chambers. A flow channel II13 and a flow channel I14 are provided in the valve body 6 along the axial direction. The flow channel II13 connects the outlet nozzle 2 and the rear chamber, and the flow channel I14 connects the front chamber and the inlet nozzle 10.

[0009] A valve port I3 is fixedly arranged in the front cavity of the valve body 6, and a valve I4 is arranged in the front cavity, and both sides are connected to the valve port I3 and the partition through springs; an air passage is arranged on the valve port I3 to communicate with the air outlet nozzle 2, and the valve I4 and the valve port I3 are opened and closed by an annular cutting edge and an annular sealing member to realize the opening and closing of the air passage on the valve port I3 and the rear cavity;

[0010] A valve port II9 is ​​fixedly arranged in the rear cavity of the valve body 6, and a valve II8 is arranged in the rear cavity, and is connected to the valve port II9 and the partition plate on both sides through springs; an air duct is arranged on the valve port II9 and is connected to the air inlet nozzle 10, and an annular cutting edge and an annular sealing member are used between the valve II8 and the valve port II9 to realize opening and closing of the air duct on the valve port II9 and the front cavity.

[0011] Optionally, the breathing safety pressure relief valve further includes: a manual pressure relief port 1, a valve III 16, a valve port III 17, a push rod 18, and a push rod cap 19;

[0012] The valve body 6 is a T-shaped structure, and a manual pressure relief port 1 is provided on the valve body 6;

[0013] A manual pressure relief chamber is also provided inside the valve body 6, and the manual pressure relief chamber is communicated with the manual pressure relief port 1, and is communicated with the flow channel I14, and further communicated with the air inlet nozzle 10;

[0014] A valve port III17 is fixedly arranged in the manual pressure relief chamber, and a valve III16 is arranged in the manual pressure relief chamber. The first end of the valve III16 passes through the valve port III17 and is connected to a push rod 18. The push rod 18 passes through the valve body 6 and is connected to a push rod cap 19. The second end of the valve III16 is connected to the first end of the spring, and the second end of the spring is clamped in the manual pressure relief chamber.

[0015] The manual pressure relief port 1 and the manual pressure relief chamber are opened and closed by an annular cutting edge and an annular sealing member between the valve III16 and the valve port III17.

[0016] Optionally, the cross-section of the cutting edge is triangular.

[0017] Optionally, a guide rod is provided at one end of the valve I4 and the valve II8;

[0018] A guide hole is provided in the valve port I3 and the valve port II9;

[0019] The guide rod is inserted into the guide hole.

[0020] Optionally, non-metallic bushings are provided in the guide holes of the valve port I3 and the valve port II9.

[0021] Optionally, the annular seal is rubber.

[0022] Optionally, the air outlet nozzle 2 and the air inlet nozzle 10 are sealed with the valve body 6 via a sealing ring.

[0023] Optionally, the manual pressure relief port 1 is sealed with the valve body 6 via a sealing ring.

[0024] The present invention provides a breathing type safety pressure relief valve. Through the design of air path flow channel and valve body structure, an independent "rubber valve + metal blade" end face sealing structure is designed inside the valve body of a small safety pressure relief valve, which can respectively meet the negative pressure intake and positive pressure exhaust functions under different pressure indicators; the valve opening mode is a gradual opening mode, which can provide breathable pressure relief and ensure pressure stability; the valve sealing mode is an end face sealing mode, and the sealing pair has less wear during long-term reciprocating operation, thereby extending the product life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a breathing type safety pressure relief valve;

[0026] Description of reference numerals:

[0027] 1-Manual pressure relief port;

[0028] 2- Exhaust nozzle;

[0029] 3-valve port I;

[0030] 4- Valve I;

[0031] 5- Spring;

[0032] 6-valve body;

[0033] 7- Spring;

[0034] 8- Valve II;

[0035] 9-valve port II;

[0036] 10- Air intake nozzle;

[0037] 11- Spring;

[0038] 12-spring;

[0039] 13-Flow channel II;

[0040] 14-flow channel I;

[0041] 15- Spring;

[0042] 16- Valve III;

[0043] 17-valve port III;

[0044] 18- ejector rod;

[0045] 19-Top rod cap. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0048] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] The present invention is further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0050] like Figure 1 As shown, the present invention provides a breathing safety pressure relief valve, including: a manual pressure relief port 1, an air outlet nozzle 2, a valve port I3, a valve I4, a valve body 6, a valve II8, a valve port II9, an air inlet nozzle 10, a flow channel II13, a flow channel I14, a valve III16, a valve port III17, a push rod 18, and a push rod cap 19;

[0051] The air outlet nozzle 2 and the air inlet nozzle 10 are installed on the front and rear sides of the valve body 6 through threaded connection;

[0052] A partition is provided in the middle of the valve body 6 to divide the valve body 6 into two front and rear chambers. A flow channel II13 and a flow channel I14 are provided in the valve body 6 along the axial direction. The flow channel II13 connects the outlet nozzle 2 and the rear chamber, and the flow channel I14 connects the front chamber and the inlet nozzle 10.

[0053] A valve port I3 is fixedly arranged in the front cavity of the valve body 6, and a valve I4 is arranged in the front cavity, and both sides are connected to the valve port I3 and the partition through springs; an air passage is arranged on the valve port I3 to communicate with the air outlet nozzle 2, and the valve I4 and the valve port I3 are opened and closed by an annular cutting edge and an annular sealing member to realize the opening and closing of the air passage on the valve port I3 and the rear cavity;

[0054] A valve port II9 is ​​fixedly arranged in the rear cavity of the valve body 6, and a valve II8 is arranged in the rear cavity, and is connected to the valve port II9 and the partition plate on both sides through springs; an air duct is arranged on the valve port II9 and is connected to the air inlet nozzle 10, and an annular cutting edge and an annular sealing member are used between the valve II8 and the valve port II9 to realize opening and closing of the air duct on the valve port II9 and the front cavity.

[0055] Optionally, the valve body 6 is a T-shaped structure, and a manual pressure relief port 1 is provided on the valve body 6;

[0056] A manual pressure relief chamber is also provided inside the valve body 6, and the manual pressure relief chamber is communicated with the manual pressure relief port 1, and is communicated with the flow channel I14, and further communicated with the air inlet nozzle 10;

[0057] A valve port III17 is fixedly arranged in the manual pressure relief chamber, and a valve III16 is arranged in the manual pressure relief chamber. The first end of the valve III16 passes through the valve port III17 and is connected to a push rod 18. The push rod 18 passes through the valve body 6 and is connected to a push rod cap 19. The second end of the valve III16 is connected to the first end of the spring, and the second end of the spring is clamped in the manual pressure relief chamber.

[0058] The manual pressure relief port 1 and the manual pressure relief chamber are opened and closed by an annular cutting edge and an annular sealing member between the valve III16 and the valve port III17.

[0059] Optionally, the cross-section of the cutting edge is triangular.

[0060] Optionally, a guide rod is provided at one end of the valve I4 and the valve II8;

[0061] A guide hole is provided in the valve port I3 and the valve port II9;

[0062] The guide rod is inserted into the guide hole.

[0063] Optionally, non-metallic bushings are provided in the guide holes of the valve port I3 and the valve port II9.

[0064] Optionally, the annular seal is rubber.

[0065] Optionally, the air outlet nozzle 2 and the air inlet nozzle 10 are sealed with the valve body 6 via a sealing ring.

[0066] Optionally, the manual pressure relief port 1 is sealed with the valve body 6 via a sealing ring.

[0067] The outlet nozzle 2 and the inlet nozzle 10 of the safety pressure relief valve are installed on the front and rear sides of the valve body 6 through threaded connection, and are sealed with the valve body 6 through a sealing ring; the manual pressure relief port 1 is installed on the upper part of the valve body through screws, and is sealed with the valve body 6 through a sealing ring. The functions of the safety pressure relief valve include positive pressure exhaust, negative pressure intake, and manual pressure relief.

[0068] The positive pressure exhaust function of the safety relief valve is mainly completed by valve II8, valve port II9, and flow channel II13. When the pressure in the oil tank is lower than the positive pressure exhaust pressure, the rubber sealing surface of valve II8 is in close contact with the cutting edge of valve port II9 under the joint action of spring 7 and spring 12 to ensure the valve seal; when the pressure in the oil tank is higher than the positive pressure exhaust pressure, valve II8 overcomes the spring force and separates from valve port II under the action of the internal and external pressure difference, and the gas in the oil tank flows through the air inlet nozzle 10 and flow channel II13 in turn, and then flows out from the air outlet nozzle 2 to achieve the positive pressure exhaust function.

[0069] The negative pressure intake function of the safety relief valve is mainly completed by the valve I4, the valve port I3, and the flow channel I14. When the pressure in the oil tank is greater than the negative pressure intake pressure, the rubber sealing surface of the valve I4 is in close contact with the cutting edge of the valve port I3 under the joint action of the spring 5 and the spring 11 to ensure the valve seal; when the pressure in the oil tank is less than the negative pressure intake pressure, the valve I4 overcomes the spring force and separates from the valve port I under the action of the internal and external pressure difference, and the external gas flows through the outlet nozzle 2 and the flow channel I14 in turn, and then enters the oil tank from the intake nozzle 10 to achieve the negative pressure intake function.

[0070] The manual pressure relief function of the safety pressure relief valve is completed by the spring 5, valve III16, valve port III17, push rod 18, and push rod cap 19. After manually pressing the push rod cap 19, the push rod 18 pushes the valve III16 to move, and the valve port III17 opens. The gas in the oil tank flows through the intake nozzle 10 and the upper side of the flow channel I14, and is discharged from the manual pressure relief port 1; after unloading the pressing force, the valve port III17 resumes contact with the valve III16 under the elastic force of the spring 5 to ensure the air tightness of the valve.

[0071] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A breathing safety pressure relief valve, characterized in that: include: An air outlet nozzle (2), a valve port I (3), a valve I (4), a valve body (6), a valve II (8), a valve port II (9), an air inlet nozzle (10), a flow channel II (13), and a flow channel I (14); The air outlet nozzle (2) and the air inlet nozzle (10) are installed on the front and rear sides of the valve body (6) through threaded connection; A partition is provided in the middle of the valve body (6) to divide the valve body (6) into two front and rear chambers. A flow channel II (13) and a flow channel I (14) are provided in the valve body (6) along the axial direction. The flow channel II (13) connects the air outlet nozzle (2) and the rear chamber, and the flow channel I (14) connects the front chamber and the air inlet nozzle (10). A valve port I (3) is fixedly arranged in the front cavity of the valve body (6), and a valve I (4) is arranged in the front cavity, and the two sides are connected to the valve port I (3) and the partition plate through springs; an air passage is arranged on the valve port I (3) and communicates with the air outlet nozzle (2), and an annular cutting edge and an annular sealing member are used between the valve I (4) and the valve port I (3) to realize opening and closing of the air passage on the valve port I (3) and the rear cavity; A valve port II (9) is fixedly arranged in the rear cavity of the valve body (6), and a valve II (8) is arranged in the rear cavity, and is connected to the valve port II (9) and the partition plate on both sides through springs; an air passage is arranged on the valve port II (9) and is connected to the air inlet nozzle (10), and an annular cutting edge and an annular sealing member are used between the valve II (8) and the valve port II (9) to realize opening and closing of the air passage on the valve port II (9) and the front cavity.

2. The breathing safety pressure relief valve according to claim 1, characterized in that: Also includes: Manual pressure relief port (1), valve III (16), valve port III (17), ejector rod (18), ejector rod cap (19); The valve body (6) is a T-shaped structure, and a manual pressure relief port (1) is provided on the valve body (6); A manual pressure relief chamber is also provided inside the valve body (6), and the manual pressure relief chamber is in communication with the manual pressure relief port (1), and is in communication with the flow channel I (14), and is further in communication with the air inlet nozzle (10); A valve port III (17) is fixedly arranged in the manual pressure relief chamber, a valve III (16) is arranged in the manual pressure relief chamber, a first end of the valve III (16) passes through the valve port III (17) and is connected to a push rod (18), the push rod (18) passes through the valve body (6) and is connected to a push rod cap (19); a second end of the valve III (16) is connected to a first end of a spring, and a second end of the spring is clamped in the manual pressure relief chamber; The manual pressure relief port (1) and the manual pressure relief chamber are opened and closed via an annular cutting edge and an annular sealing member between the valve III (16) and the valve port III (17).

3. The breathing safety pressure relief valve according to claim 1, characterized in that: The cross section of the cutting edge is triangular.

4. The breathing safety pressure relief valve according to claim 1, characterized in that: A guide rod is provided at one end of the valve I (4) and the valve II (8); The valve port I (3) and the valve port II (9) are provided with guide holes; The guide rod is inserted into the guide hole.

5. The breathing safety pressure relief valve according to claim 4, characterized in that: Non-metallic bushings are arranged in the guide holes of the valve port I (3) and the valve port II (9).

6. The breathing safety pressure relief valve according to claim 1, characterized in that: The annular seal is rubber.

7. The breathing safety pressure relief valve according to claim 1, characterized in that: The air outlet nozzle (2) and the air inlet nozzle (10) are sealed with the valve body (6) via a sealing ring.

8. The breathing safety pressure relief valve according to claim 1, characterized in that: The manual pressure relief port (1) is sealed with the valve body (6) via a sealing ring.

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