High-flow easily-detached diaphragm type safety relief device and using method

Abstract

The invention discloses a large-flow easily-detached diaphragm type safety relief device and a using method. The device comprises a plug, a connecting baffle ring, a closed gas cylinder connecting piece and an arc-shaped diaphragm. The plug is in threaded connection with the sealing device, the connecting baffle ring is arranged on the upper portion in the closed air cylinder connecting piece and fixedly connected with the lower end of the plug, the upper portion of the closed air cylinder connecting piece is pressed to the lower portion of the plug through the baffle ring, and the lower portion of the closed air cylinder connecting piece is in threaded connection with the arc-shaped membrane. A circular through hole communicated with the interior of the sealing device is formed in the outer wall of the closed air cylinder connecting piece, the bottom structure of the diaphragm is arc-shaped and is provided with a right-angle limiting step and a notch groove, and the outer wall of the plug and the outer wall of the diaphragm are sleeved with an upper sealing element and a lower sealing element respectively. The device can be applied to the field of large-flow high-pressure transportation and storage equipment, is convenient to disassemble and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the field of gas-liquid transportation or storage, and relates to a large-flow easily detachable diaphragm type safety relief device and a use method thereof. Background Art

[0002] The diaphragm safety relief device is a safety accessory installed in pressure vessels and pressure pipes that can automatically relieve pressure when overpressure occurs to prevent overpressure explosion. The diaphragm safety relief device uses a safety diaphragm as an isolation seal. When the set safety value is reached, the safety diaphragm bursts and is irreversible. It needs to be manually reset to close, such as manually replacing the safety diaphragm.

[0003] Existing diaphragm-type safety relief devices are mainly used in devices with small storage volumes and are difficult to use in transportation and storage equipment with high pressure and large flow rates. Summary of the invention

[0004] The object of the present invention is to provide a diaphragm type safety relief device and a method of use, which can be applied to the field of large flow and high pressure transportation and storage equipment.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] A large flow easily disassembled diaphragm type safety relief device, comprising a plug, a connecting retaining ring, a gas-blocking cylinder connecting piece and an arc-shaped diaphragm;

[0007] The plug is threadedly connected to the sealing device, the connecting baffle is arranged above the interior of the air-sealing cylinder connecting piece, the connecting baffle is fixedly connected to the lower end of the plug, the upper part of the air-sealing cylinder connecting piece is pressed to the lower part of the plug through the baffle, the lower part of the air-sealing cylinder connecting piece is threadedly connected to the arc-shaped diaphragm, the outer wall of the air-sealing cylinder connecting piece is provided with a through hole interconnected with the interior of the high-pressure sealing device, an upper sealing element is installed between the plug and the air-sealing cylinder connecting piece, and a lower sealing element is installed between the air-sealing cylinder connecting piece and the arc-shaped diaphragm.

[0008] Furthermore, a first external thread is provided on the outer wall of the plug, an internal thread is provided on the inner wall of the arc-shaped diaphragm, and a second external thread matching the internal thread of the arc-shaped diaphragm is provided on the lower outer wall of the air-blocking tube connecting piece, and the pitch of the first external thread of the plug is greater than the pitch of the internal thread of the arc-shaped diaphragm.

[0009] Furthermore, the first external thread is a T-type thread.

[0010] Furthermore, the upper sealing element includes a triangular sealing ring a, an O-ring a and a retaining ring a which are sequentially mounted from top to bottom, and the lower sealing element includes a retaining ring b, an O-ring b and a triangular sealing ring b which are sequentially mounted from top to bottom.

[0011] Furthermore, the upper outer wall of the plug has an open hole structure, a threaded hole is provided at the bottom, a through hole is provided on the connecting retaining ring, and a first limiting step is provided on the inner wall of the air-blocking tube connecting piece. When the bolt passes through the through hole on the connecting retaining ring and is connected to the threaded hole at the bottom of the plug, the edge of the connecting retaining ring can form a limiting clamping connection with the surface of the first limiting step to press the air-blocking tube connecting piece to the bottom of the plug.

[0012] Furthermore, the bottom of the arc-shaped diaphragm is an arc-shaped structure and is provided with a right-angle limit step, and a second limit step is provided at the pipe of the high-pressure sealing device. When the discharge device is installed in the high-pressure sealing device, the right-angle limit step can fit and limit with the second limit step, and the bottom of the arc-shaped diaphragm has a groove, and the groove is a circular, triangular or trapezoidal groove.

[0013] Furthermore, the outer wall of the arc-shaped diaphragm forms an inwardly contracting angle from top to bottom.

[0014] Furthermore, the diaphragm type safety relief device is used in a high-pressure sealing device.

[0015] A method for using the above-mentioned diaphragm type safety relief device comprises the following steps:

[0016] Step 1: Install the diaphragm-type safety relief device in the high-pressure sealing device, and tighten it into the high-pressure sealing device through the first external thread on the plug. When the right-angle limit step surface at the bottom of the arc-shaped diaphragm fits with the second limit step surface at the pipeline of the high-pressure sealing device, continue to tighten the plug to compress the upper sealing element and the lower sealing element to form a complete seal at the upper and lower ends;

[0017] Step 2: Fill the gas and liquid into the high-pressure sealing device, and the gas and liquid enter the upper part of the arc-shaped diaphragm through the through hole on the outer wall of the air-blocking cylinder connecting piece;

[0018] Step 3: When the air pressure of the high-pressure sealing device is greater than the maximum force of the arc-shaped diaphragm, the arc-shaped diaphragm ruptures, and the gas and liquid can begin to leak through the ruptured diaphragm holes to reduce the pressure.

[0019] Furthermore, the method further comprises step 4: during disassembly, the first external thread of the plug is loosened, and the diaphragm type safety relief device is lifted upward for disassembly.

[0020] Compared with the prior art, the technical effects achieved by the present invention are as follows:

[0021] By changing the thickness of the diaphragm and the grooves of different shapes and depths at the bottom of the diaphragm, safety protection can be achieved under large flow and different high pressure environments.

[0022] 1. The present invention innovatively changes the flat bottom of the diaphragm into an arc shape, which greatly improves the anti-breakage ability of the entire valve body diaphragm structure. Under the same diaphragm thickness, the grooves of the round bottom structure can withstand larger flow and greater pressure. By carving grooves on the arc bottom surface and changing the shape and depth of the grooves, safety protection under large flow and different high-pressure environments can be achieved.

[0023] 2. A circular opening is provided on the air-blocking cylinder connector to allow gas and liquid to pass through and block foreign objects larger than the diaphragm opening to prevent the diaphragm from rupturing and blocking the opening.

[0024] 3. By setting the first external thread pitch of the plug to be much larger than the internal thread pitch of the diaphragm, it is ensured that the rotation of the plug will not loosen the threaded connection between the bottom diaphragm and the air-blocking cylinder connector, and the entire device can be easily installed and disassembled by rotating the external thread of the plug.

[0025] 4. The outer wall of the diaphragm is an inward contraction angle, which is conducive to the overall installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Attached Figure 1 It is a structural schematic diagram of the diaphragm type safety relief device of the present invention;

[0027] Attached Figure 2 for Figure 1 A is an enlarged schematic diagram of area A;

[0028] Attached Figure 3 for Figure 1 A magnified schematic diagram of area B;

[0029] Attached Figure 4 This is a schematic diagram of the connecting retaining ring structure of the present invention;

[0030] Attached Figure 5 It is a schematic diagram of the slope of the outer wall of the diaphragm of the present invention;

[0031] Attached Figure 6 This is a schematic diagram of the diaphragm structure of the present invention;

[0032] Attached Figure 7 This is a comparison diagram of the membrane rupture pressure of the grooved arc diaphragm and the grooved flat bottom diaphragm of the present invention.

[0033] Figure numerals: 1. plug; 2. connecting retaining ring; 201. through hole; 3. air-blocking cylinder connecting piece; 4. arc-shaped diaphragm; 401. groove; 402. right-angle limit step; 5. triangular sealing ring a; 6. O-ring a; 7. retaining ring a; 8. retaining ring b; 9. O-ring b; 10. triangular sealing ring b; 11. high-pressure sealing device. DETAILED DESCRIPTION

[0034] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] like Figure 1-3 As shown, the present invention describes a large-flow, easily disassembled diaphragm-type safety relief device, comprising a plug 1, a connecting retaining ring 2, an air-sealing cylinder connector 3, an arc-shaped diaphragm 4, a high-pressure sealing device 11, a triangular sealing ring a5, an O-ring a6, a retaining ring a7, a triangular sealing ring b10, an O-ring b9 and a retaining ring b8; the plug 1 is matched with the high-pressure sealing device 11 through a T-type thread, the connecting retaining ring 2 is inside the air-sealing cylinder connector, and the plug 1 and the air-sealing cylinder connector are pressed together by bolts, and the arc-shaped diaphragm 4 is pressed together with the air-sealing cylinder connector 3 through threads.

[0036] The upper outer wall of the plug 1 has an open hole structure and a threaded hole at the bottom. A through hole 201 is provided on the connecting retaining ring 2. A first limiting step is provided on the inner wall of the air-blocking tube connecting piece 3. When the bolt passes through the through hole on the connecting retaining ring 2 and is connected to the threaded hole at the bottom of the plug 1, the edge of the connecting retaining ring 2 can form a limiting clamping connection with the surface of the first limiting step, thereby pressing the air-blocking tube connecting piece 3 to the bottom of the plug 1.

[0037] Combination Figure 4 The connecting retaining ring 2 is provided with four through holes 201, through which bolts can pass to connect with the bottom threaded holes on the plug 1.

[0038] Combination Figure 2 A triangular sealing ring a5, an O-ring a6 and a retaining ring a7 are provided between the plug 1 and the air-blocking tube connector 3 for combined sealing, and the three are compressed and sealed by bolts, which can effectively ensure that the upper part of the device reaches a sealed state.

[0039] Combination Figure 3 A triangular sealing ring b10, an O-ring b9 and a retaining ring b8 are provided between the air-locking tube connector 3 and the arc-shaped diaphragm 4 for combined sealing. The three are compressed and sealed by threaded connection, which can effectively ensure that the lower part of the device reaches a sealed state.

[0040] A circular through hole is provided on the outer wall of the air-locking cylinder connector 3, and the high-pressure gas and liquid in the high-pressure sealing device 11 can flow into the discharge device through the circular through hole, giving a downward pressure F1 to the bottom arc-shaped diaphragm 4. The circular through hole allows gas and liquid to pass through, blocking foreign objects larger than the diaphragm opening to prevent clogging of the diaphragm rupture opening.

[0041] Combination Figure 5 The outer wall of the arc-shaped diaphragm 4 forms an inwardly contracted angle from top to bottom, which is conducive to the overall installation and removal.

[0042] Combination Figure 6The bottom of the arc-shaped diaphragm 4 is an arc-shaped structure, and a right-angle limit step 401 is also provided at the bottom of the arc-shaped diaphragm 4. A second limit step is provided at the pipeline of the high-pressure sealing device 11. When the discharge device is installed in the high-pressure sealing device 11, the right-angle limit step 402 can fit and limit with the second limit step. The bottom of the arc-shaped diaphragm 4 has a groove 402, and the groove 402 is a circular, triangular or trapezoidal groove or other shapes. The rupture pressure and rupture position can be more accurately controlled and adjusted through the groove 402. When the pressure F1 is greater than the maximum force at the groove of the diaphragm, the diaphragm ruptures from the groove 402.

[0043] Combination Figure 7 After finite element simulation analysis, for the same 6mm thick diaphragm with grooves, the rupture pressure of the flat diaphragm is about 200Mpa, and the rupture pressure of the curved diaphragm is about 264Mpa. Changing the grooved flat diaphragm structure to the curved groove structure effectively improves the rupture pressure.

[0044] The pitch of the T-thread on the plug 1 is much larger than the pitch of the thread on the arc-shaped diaphragm 4. Preferably, the pitch of the T-thread on the plug 1 is more than 3 times the pitch of the thread on the arc-shaped diaphragm 4. When the plug is loosened and tightened, it will not affect the connection between the air-sealing tube connector 3 and the arc-shaped diaphragm 4. That is, when the plug 1 is rotated, since the pitch of the T-thread is larger than the pitch of the thread on the arc-shaped diaphragm 4, no relative rotation will occur between the air-sealing tube connector 3 and the arc-shaped diaphragm 4.

[0045] The present invention also provides a method for using a large flow easily detachable diaphragm type safety relief device, comprising the following steps:

[0046] Step 1: Install the diaphragm type safety relief device in the high-pressure sealing device 11, and tighten and install it into the high-pressure sealing device 11 through the first external thread on the plug 1. When the limit position of the arc-shaped diaphragm 4 is in contact with the pipe limit position of the high-pressure sealing device 11, continue to tighten the plug 1 to compress the upper sealing element and the lower sealing element to form a complete seal at both ends;

[0047] Among them, the specific method of installing the diaphragm type safety relief device in the high-pressure sealing device 11 includes: assembling the plug 1, the upper sealing element, the air-blocking cylinder connector 3 and the connecting retaining ring 2 together; assembling the air-blocking cylinder connector 3, the lower sealing element and the arc diaphragm 4 through threaded connection.

[0048] Step 2: Fill the gas and liquid into the high-pressure sealing device 11, and the gas and liquid enter the upper part of the diaphragm through the circular through hole on the outer wall of the air-sealing cylinder connecting piece 3.

[0049] Step 3: When the air pressure of the high-pressure sealing device 11 is greater than the maximum force of the arc-shaped diaphragm 4, the arc-shaped diaphragm 4 ruptures, and the gas and liquid can begin to leak through the ruptured diaphragm holes to reduce the pressure.

[0050] Step 4: When the diaphragm safety relief device needs to be disassembled, it is only necessary to loosen the plug 1, and the T-thread will lift the diaphragm safety relief device upward. Since the pitch of the T-thread is different from the pitch of the diaphragm thread, the connection between the air-blocking cylinder connector and the diaphragm will not become loose, so that the diaphragm safety relief device can be disassembled as a whole.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A large flow easily detachable diaphragm type safety relief device, characterized in that: It comprises a plug (1), a connecting baffle ring (2), a gas-blocking cylinder connecting piece (3) and an arc-shaped diaphragm (4); The plug (1) is threadedly connected to the sealing device, the connecting retaining ring (2) is arranged above the inside of the air-tight cylinder connecting piece (3), the connecting retaining ring (2) is fixedly connected to the lower end of the plug (1), the upper part of the air-tight cylinder connecting piece (3) is pressed to the lower part of the plug (1) through the retaining ring (2), the lower part of the air-tight cylinder connecting piece (3) is threadedly connected to the arc-shaped diaphragm (4), the outer wall of the air-tight cylinder connecting piece (3) is provided with a through hole interconnected with the inside of the high-pressure sealing device (11), an upper sealing element is installed between the plug (1) and the air-tight cylinder connecting piece (3), and a lower sealing element is installed between the air-tight cylinder connecting piece (3) and the arc-shaped diaphragm (4).

2. The diaphragm type safety relief device according to claim 1, characterized in that: The plug (1) has a first external thread on its outer wall, the arc-shaped diaphragm (4) has an internal thread on its inner wall, and the air-blocking tube connector (3) has a second external thread on its lower outer wall that matches the internal thread of the arc-shaped diaphragm (4). The pitch of the first external thread of the plug (1) is greater than the pitch of the internal thread of the arc-shaped diaphragm (4).

3. The diaphragm type safety relief device according to claim 2, characterized in that: The first external thread is a T-type thread.

4. The diaphragm type safety relief device according to claim 2, characterized in that: The upper sealing element comprises a triangular sealing ring a, an O-type sealing ring a and a retaining ring a which are sequentially mounted from top to bottom, and the lower sealing element comprises a retaining ring b, an O-type sealing ring b and a triangular sealing ring b which are sequentially mounted from top to bottom.

5. The diaphragm type safety relief device according to any one of claims 2 to 4, characterized in that: The upper outer wall of the plug (1) has an open hole structure, a threaded hole is provided at the bottom, a through hole (201) is provided on the connecting retaining ring (2), and a first limiting step is provided on the inner wall of the air-blocking tube connecting piece (3). When the bolt passes through the through hole on the connecting retaining ring (2) and is connected to the threaded hole at the bottom of the plug (1), the edge of the connecting retaining ring (2) can form a limiting clamping connection with the surface of the first limiting step, thereby pressing the air-blocking tube connecting piece (3) to the bottom of the plug (1).

6. The diaphragm type safety relief device according to claim 5, characterized in that: The bottom of the arc-shaped diaphragm (4) is an arc-shaped structure and is provided with a right-angled limiting step (402); a second limiting step is provided at the pipeline of the high-pressure sealing device (11); when the discharge device is installed in the high-pressure sealing device (11), the right-angled limiting step (402) can be fitted with the second limiting step for limiting; the bottom of the arc-shaped diaphragm (4) has a groove (402); the groove (402) is a circular, triangular or trapezoidal groove.

7. The diaphragm type safety relief device according to claim 6, characterized in that: The outer wall of the arc-shaped diaphragm (4) forms an inwardly contracting angle from top to bottom.

8. The diaphragm type safety relief device according to claim 7, characterized in that: The diaphragm type safety relief device is used in a high-pressure sealing device (11).

9. The method for using the diaphragm type safety relief device according to any one of claims 6 to 8, characterized in that: The steps include: Step 1: Install the diaphragm-type safety relief device in the high-pressure sealing device (11), and screw it into the high-pressure sealing device (11) through the first external thread on the plug (1). When the right-angled limiting step surface at the bottom of the arc-shaped diaphragm (4) is in contact with the second limiting step surface at the pipeline of the high-pressure sealing device (11), continue to tighten the plug (1) to compress the upper sealing element and the lower sealing element to form a complete seal at the upper and lower ends; Step 2: Fill the gas and liquid into the high-pressure sealing device (11), and the gas and liquid enter the upper part of the arc-shaped diaphragm (4) through the through hole on the outer wall of the air-sealing cylinder connecting piece (2); Step 3: When the air pressure of the high-pressure sealing device (11) is greater than the maximum force of the arc-shaped diaphragm (4), the arc-shaped diaphragm (4) ruptures, and the gas and liquid can begin to leak through the ruptured diaphragm holes to reduce the pressure.

10. The method of use according to claim 9, characterized in that: The method further comprises step 4: during disassembly, loosening the first external thread of the plug (1) and lifting the diaphragm type safety relief device upwards for disassembly.

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