Underwater automatic reset explosion-proof device and shock wave isolation method

Abstract

The invention relates to the technical field of anti-explosion protection valves, and discloses an underwater automatic reset anti-explosion device and a shock wave isolation method.The underwater automatic reset anti-explosion device is characterized in that a closed piston is arranged in an anti-explosion valve body, and a plurality of rows of partition plates are horizontally arranged in an inner cavity of the anti-explosion valve body in the direction from a flow inlet to a flow outlet; the multiple rows of partition plates are coaxially provided with circulation holes, the multiple rows of partition plates divide an inner cavity of the anti-explosion valve body into a plurality of cavities, the closed piston stretches and retracts through the reset unit, the reset unit is compressed in the closing process of the closed piston, after shock waves are dissipated, the reset unit jacks the closed piston back to the original position, all the flow channels recover to be smooth, and therefore the anti-explosion valve is closed. The anti-explosion valve recovers to be smooth, and the situation that after each time of impact resistance, manual intervention is needed to recover the normal working state is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof protection valves, and in particular to an underwater automatic resetting explosion-proof device and a shock wave isolation method. Background Art

[0002] With the development of economic and military globalization, the ocean has become an important channel for communication between countries. Therefore, there are various pipeline equipment, ships and vessels underwater. Some equipment, such as water pressure detection devices and pipeline insulation joints, need to contact with external water bodies and withstand a certain water pressure. In the event of an underwater explosion, the pressure on ship equipment and pipeline joints will increase instantly due to the effect of shock waves, causing damage to the equipment or destroying the sealing of the pipeline joints. Therefore, an underwater explosion-proof valve is needed to ensure smooth flow under normal working pressure, but when the shock wave comes, the pressure increase instantly isolates the shock wave, absorbs the shock wave energy, and ensures the safety of the pipeline and equipment behind the valve, and after the shock wave dissipates, it can automatically reset and restore the normal working path.

[0003] Existing explosion-proof protection valves are mostly used at the air inlets and outlets of factories, mainly to isolate the shock waves generated by explosions in the air and protect the safety of equipment and personnel behind the valve. However, this type of protection valve is large in size and has many motorized devices. During the closing process, the air inside the valve body needs to be squeezed. However, liquid is different from air medium and its compressibility is much lower than that of air. Therefore, if the medium in the existing air explosion-proof valve is replaced with liquid, the motorized devices in most explosion-proof valves cannot be closed normally, or even if they are closed, the shock wave energy will be transmitted to the rear through the liquid, and the shock wave energy cannot be isolated. In addition, existing explosion-proof valves rarely use energy absorption devices, and most of their energy is absorbed by their motorized devices or valve bodies. When faced with large impact energy or multiple impacts, the valve body or motorized device structure will be damaged. In addition, some explosion-proof valves currently require manual intervention and reset after the explosion to restore normal working conditions, which is inconvenient for daily use. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide an underwater automatic resetting explosion-proof device and a shock wave isolation method to solve the technical problems in the prior art that the explosion-proof valve cannot be closed normally in the liquid and cannot isolate the shock wave energy.

[0005] The present invention is achieved through the following technical solutions: In the first aspect, the present invention provides an underwater automatic reset explosion-proof device, including an explosion-proof valve body, wherein the top end of the explosion-proof valve body is provided with an inlet, and the bottom end is provided with an outlet; a closed piston is provided in the explosion-proof valve body for blocking the medium entering the inlet; the inner chamber of the explosion-proof valve body is horizontally provided with a plurality of rows of partition plates along the direction from the inlet to the outlet, and the plurality of rows of partition plates are coaxially provided with flow holes, and the plurality of rows of partition plates divide the inner chamber of the explosion-proof valve body into a plurality of chambers, wherein the plurality of chambers include a plurality of piston ring chambers and energy absorbing ball chambers; wherein the energy absorbing ball chamber is arranged close to the outlet, and a reset unit is provided in the energy absorbing ball chamber, and the energy absorbing ball chamber is connected to the outlet; the closed piston includes a plurality of piston isolation plates and a connecting rod, and each piston The isolation plates are correspondingly distributed in each piston ring chamber, and each piston isolation plate is connected along the flow holes of each row of partition plates by a connecting rod, and one end of the connecting rod is connected to the reset unit of the energy absorbing ball chamber, which is used to drive the connecting rod and drive each piston isolation plate to seal the medium in the chamber through the reset unit; a plurality of piston closing rings are symmetrically arranged in each piston ring chamber with the connecting rod as the center, and the plurality of piston closing rings are staggered on the piston isolation plate and the partition plate, and the staggered gaps form a medium flow route, and a gap is set between the connecting rod and the flow holes of each row of partition plates; energy absorbing balls are symmetrically arranged in the energy absorbing ball chamber with the reset unit as the center, which are used to absorb the energy transmitted to the outlet during the closing process of the closing piston.

[0006] Preferably, a downflow channel is arranged at a position of the partition plate corresponding to the piston sealing ring on the piston isolation plate in the piston ring chamber, and an upflow channel is arranged at a position of the piston isolation plate corresponding to the piston sealing ring on the partition plate, and both the downflow channel and the upflow channel are recessed, and the recessed surface corresponds to the annular surface of the piston sealing ring.

[0007] Preferably, the top surface of the piston isolation plate close to the inlet side is an arc surface, and the outer circle of the top surface of the piston isolation plate is chamfered.

[0008] Preferably, the connecting rod is provided with a blocking block at the upper end of the flow hole of each row of partition plates, and the diameter of the blocking block is larger than the aperture of the flow hole.

[0009] Furthermore, a sealing gasket is provided at the upper end of the flow hole, and the blocking block is arranged in contact with the sealing gasket.

[0010] Preferably, the connecting rod has piston supporting ribs arranged alternately between the flow holes of each row of partition plates.

[0011] Preferably, the reset unit includes a reset chamber shell, a reset spring is fixedly provided in the reset chamber shell, the connecting rod is fixedly connected to the reset spring, and limiting buckles are provided at both ends of the top of the reset chamber shell for limiting the connecting rod to the reset chamber shell, and a sealing ring is provided between the limiting buckle and the connecting rod.

[0012] Preferably, arc-shaped grooves are provided on the upper and lower partition plates in the energy-absorbing ball chamber, and the energy-absorbing balls are placed in the arc-shaped grooves.

[0013] Preferably, a flow chamber is provided between the energy absorbing ball chamber and the flow outlet, the flow chamber is communicated with the flow outlet, and two sides of the flow chamber are communicated through flow holes.

[0014] In a second aspect, the present invention further provides a method for isolating shock waves of an underwater automatic reset explosion-proof device, based on the above-mentioned underwater automatic reset explosion-proof device, comprising the following steps: After the medium shock wave enters the inlet at the top of the explosion-proof valve body, it acts on the piston isolation plate in the first layer of piston ring chamber, and pushes the piston isolation plate to move the entire closed piston toward the outlet, so that the piston isolation plate compresses the closed ring, the connecting rod compresses the reset unit, and each layer of piston isolation plate is sealed to the flow hole of the partition plate, thereby achieving a sealing effect and isolating the impact energy; during the closing process of the closed piston, the impact energy is absorbed by the reset unit and the piston closing ring; in the energy-absorbing ball chamber, the explosion-proof valve body is closed by closing the closed piston to squeeze the medium, and then squeezes the energy-absorbing ball, and the energy-absorbing ball is deformed by compressing it to provide space for the medium to flow, thereby preventing the medium from transmitting the impact energy to the rear equipment; when the shock wave dissipates, the medium pressure at the inlet returns to the normal working level, the reset unit is backfilled, and the closed piston is pushed back to the normal working state, the medium flow channel is opened, and the explosion-proof valve body can work normally.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides an underwater automatic reset explosion-proof device, which is provided with a closed piston in the explosion-proof valve body, and a plurality of rows of partition plates are horizontally provided in the inner chamber of the explosion-proof valve body along the direction from the inlet to the outlet, and the plurality of rows of partition plates are coaxially provided with flow holes, and the plurality of rows of partition plates divide the inner chamber of the explosion-proof valve body into a plurality of chambers, and the closed piston is extended and retracted by a reset unit, and the reset unit is compressed during the closing process of the closed piston. After the shock wave dissipates, the reset unit pushes the closed piston back to its original position, and each flow channel is restored to be unobstructed, and the explosion-proof valve is restored to be unobstructed, avoiding the need for manual intervention to restore the normal working state after each impact resistance. An energy-absorbing ball is installed in the energy-absorbing ball chamber, which is used to absorb the energy transmitted to the outlet by the valve body piston during the closing process, and to provide a deformation space for the medium inside the mechanism, so as to prevent the energy generated during the closing process from being transmitted to the rear equipment through the compressed liquid medium. The arrangement of a plurality of piston ring chambers in the explosion-proof valve body greatly isolates the shock wave energy, and the normal closing of the explosion-proof valve in the liquid can be ensured by the reset unit.

[0016] Furthermore, a downflow channel is arranged at the position of the partition plate corresponding to the piston sealing ring on the piston isolation plate in the piston ring chamber, and an upflow channel is arranged at the position of the piston isolation plate corresponding to the piston sealing ring on the partition plate. Both the downflow channel and the upflow channel are recessed to provide a flow path for the medium entering the explosion-proof valve body, and the recessed surface corresponds to the annular surface of the piston sealing ring. When the medium generates a shock wave, the shock wave impacts the closing piston to close the explosion-proof valve body. The recessed surface corresponds to the annular surface of the piston sealing ring to effectively isolate the flow of the medium.

[0017] Furthermore, the top surface of the piston isolation plate near the inlet is an arc surface, and the outer circle of the top surface of the piston isolation plate is chamfered, so as to facilitate the diversion of the medium after it enters the inlet.

[0018] Furthermore, a blocking block is provided at the upper end of the flow hole of each row of partition plates of the connecting rod, and the diameter of the blocking block is larger than the aperture of the flow hole, thereby limiting the position of the closed piston in each layer of the chamber.

[0019] Furthermore, a sealing gasket is provided at the upper end of the flow hole, and the blocking block is arranged in contact with the sealing gasket, so as to effectively isolate the medium.

[0020] Furthermore, the connecting rod has piston support ribs arranged alternately between the flow holes of each row of partition plates, which support the closed piston in the flow hole, and the medium flows in the gap between the piston support rib and the flow hole.

[0021] Furthermore, the reset unit includes a reset chamber shell, in which a reset spring is fixedly provided, the connecting rod is fixedly connected to the reset spring, and limit buckles are provided at both ends of the top of the reset chamber shell for limiting the connecting rod into the reset chamber shell, and a sealing ring is provided between the limit buckle and the connecting rod. The reset spring is compressed during the closing process of the closing piston, and after the shock wave dissipates, the reset spring pushes the closing piston back to its original position, so that each flow channel is restored to unobstructed state, and the anti-explosion valve is restored to unobstructed state, thereby avoiding the need for manual intervention to restore normal working state after each anti-impact.

[0022] The present invention also provides a method for isolating shock waves of an underwater automatic reset explosion-proof device. When a shock wave arrives, the shock wave acts on the top arc surface of the closed piston, pushing the closed piston to move downward, and the piston sealing ring contacts each flow channel, closing the flow channel to block the impact energy, and the piston sealing ring is made of energy-absorbing material, which can absorb the impact energy through a certain deformation while providing a blocking function. Existing explosion-proof valves do not have such energy-absorbing devices, and the energy-absorbing effect is poor, so the protection effect is poor, and the valve body is easily damaged after repeated impact resistance. And the number of separation chambers can be set according to the size of the pre-resistance impact load. The larger the impact load, the more separation chambers and energy-absorbing devices are set. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a vertical view of the underwater automatic reset explosion-proof device of the present invention; Figure 2 It is a cross-sectional view of the underwater automatic reset explosion-proof device of the present invention; Figure 3 It is a schematic diagram of the cutaway position of the underwater self-resetting anti-explosion device of the present invention; Figure 4 for Figure 3 Schematic diagram of the cross section in the middle GG direction; Figure 5 for Figure 3 Schematic diagram of the cross section in the AA direction; Figure 6 for Figure 3 Schematic diagram of the cross section in the BB direction; Figure 7 for Figure 3 Schematic diagram of the cross section in the CC direction; Figure 8 for Figure 3 Schematic diagram of the cross section in the middle DD direction; Fig. 9 for Figure 3 Schematic diagram of the cross section in the EE direction; Fig.10 This is a schematic diagram of the normal working state of the anti-explosion valve in the present invention; Fig.11 This is a schematic diagram of the anti-explosion valve in the present invention resisting shock waves; In the figure: 1-inlet; 2-explosion-proof valve body; 3-upper flow channel; 4-closed piston; 5-arc surface; 6-chamfer; 7-piston closing ring; 8-lower flow channel; 9-piston isolation plate; 10-sealing gasket; 11-piston support rib; 12-limiting buckle; 13-sealing ring; 14-flow hole; 15-flow chamber; 16-reset spring; 17-reset chamber housing; 18-outlet; 19-energy absorbing ball; 20-partition plate; 21-arc groove; 22-connecting rod. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 only 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 creative work should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings: The purpose of the present invention is to provide an underwater automatic resetting explosion-proof device and an automatic resetting method to solve the technical problems in the prior art that the explosion-proof valve cannot be normally closed in the liquid and cannot isolate the shock wave energy.

[0027] Specifically, according to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9As shown, the underwater automatic reset explosion-proof device includes an explosion-proof valve body 2, the top of the explosion-proof valve body 2 is provided with an inlet 1, and the bottom of the explosion-proof valve body 2 is provided with an outlet 18; a closed piston 4 is provided in the explosion-proof valve body 2, which is used to block the medium entering the inlet 1; the inner chamber of the explosion-proof valve body 2 is horizontally provided with a plurality of rows of partition plates 20 along the direction from the inlet 1 to the outlet 18, and the plurality of rows of partition plates 20 are coaxially provided with flow holes, and the plurality of rows of partition plates 20 divide the inner chamber of the explosion-proof valve body 2 into a plurality of chambers, wherein the plurality of chambers include a plurality of piston ring chambers and energy absorbing ball chambers; wherein the energy absorbing ball chamber is arranged close to the outlet 18, and a reset unit is provided in the energy absorbing ball chamber, and the energy absorbing ball chamber is connected to the outlet 18; the closed piston 4 includes a plurality of piston isolation plates 9 and a connecting rod 22, and each piston isolation plate 9 Correspondingly distributed in each piston ring chamber, and each piston isolation plate 9 is connected along the flow holes of each row of partition plates 20 by a connecting rod 22, one end of the connecting rod 22 is connected to the reset unit of the energy absorbing ball chamber, which is used to drive the connecting rod 22 through the reset unit and drive each piston isolation plate 9 to seal the medium in the chamber; in each piston ring chamber, a plurality of piston sealing rings 7 are symmetrically arranged with the connecting rod 22 as the center, and the plurality of piston sealing rings 7 are respectively staggered on the piston isolation plate 9 and the partition plate 20, and the staggered gaps form a medium flow route, and a gap is set between the connecting rod 22 and the flow holes of each row of partition plates 20; in the energy absorbing ball chamber, energy absorbing balls 19 are symmetrically arranged with the reset unit as the center, which are used to absorb the energy transmitted to the outlet 18 by the closing piston 4 during the closing process.

[0028] Specifically, a downflow channel 8 is arranged at the position of the partition plate 20 corresponding to the piston sealing ring 7 on the piston isolation plate 9 in the piston ring chamber, and an upflow channel 3 is arranged at the position of the piston isolation plate 9 corresponding to the piston sealing ring 7 on the partition plate 20, and both the downflow channel 8 and the upflow channel 3 are recessed, and the recessed surface corresponds to the annular surface of the piston sealing ring 7.

[0029] Specifically, the top surface of the piston isolation plate 9 close to the inlet 1 is an arc surface 5, and the outer circle of the top surface of the piston isolation plate 9 is chamfered 6.

[0030] Specifically, the connecting rod 22 is provided with a blocking block at the upper end of the flow hole of each row of partition plates 20, and the diameter of the blocking block is larger than the aperture of the flow hole.

[0031] Specifically, a sealing gasket 10 is disposed at the upper end of the flow hole, and the blocking block is disposed in contact with the sealing gasket 10 .

[0032] Specifically, the connecting rod 22 is staggeredly arranged with the piston supporting ribs 11 between the flow holes of each row of the partition plates 20 .

[0033] Specifically, the reset unit includes a reset chamber shell 17, in which a reset spring 16 is fixedly provided, and the connecting rod 22 is fixedly connected to the reset spring 16. Limit buckles 12 are provided at both ends of the top of the reset chamber shell 17, which are used to limit the connecting rod 22 to the reset chamber shell 17, and a sealing ring 13 is provided between the limit buckle 12 and the connecting rod 22.

[0034] Specifically, an arc-shaped groove 21 is provided on the upper and lower partition plates 20 in the energy-absorbing ball chamber, and the energy-absorbing ball is placed in the arc-shaped groove 21 .

[0035] Specifically, a flow chamber 15 is provided between the energy absorbing ball chamber and the flow outlet 18 . The flow chamber 15 is communicated with the flow outlet 18 , and two sides of the flow chamber 15 are communicated through a flow hole 14 .

[0036] The present invention also provides a method for isolating shock waves of an underwater automatic reset explosion-proof device. Based on the underwater automatic reset explosion-proof device described above, according to Fig.11 As shown, the following steps are included: After the medium shock wave enters the inlet 1 at the top of the explosion-proof valve body 2, it acts on the piston isolation plate 9 in the first layer of piston ring chamber, and pushes the piston isolation plate 9 to move the entire closed piston 4 toward the outlet 18, so that the piston isolation plate 9 compresses the closed ring 7, the connecting rod 22 compresses the reset unit, and each layer of piston isolation plate 9 is sealed to the flow hole of the partition plate 20, thereby achieving a sealing effect and isolating the impact energy; during the closing process of the closed piston 4, the impact energy is absorbed by the reset unit and the piston closed ring 7; in the energy absorbing ball chamber, the explosion-proof valve body 2 is closed by closing the closed piston 4 to squeeze the medium, and then squeezes the energy absorbing ball 19, and the energy absorbing ball 19 is compressed to deform it to provide space for the medium to flow, thereby preventing the medium from transmitting the impact energy to the rear equipment; when the shock wave dissipates, the medium pressure at the inlet 1 returns to the normal working level, the reset unit is backfilled, and the closed piston 4 is pushed back to the normal working state, the medium flow channel is opened, and the explosion-proof valve body 2 can work normally.

[0037] Example according to Figure 1 and Figure 2 As shown, this embodiment provides an underwater automatic reset explosion-proof device, including an explosion-proof valve body 2, wherein the explosion-proof valve body 2 is a cylindrical metal valve, the top of the explosion-proof valve body 2 is provided with an inlet 1, and the bottom is provided with an outlet 18; the explosion-proof valve body 2 is divided into different chambers by a partition plate 20, and a circular arc-shaped lower flow channel 8 is engraved on the partition plate 20, and a sealing gasket 10 is provided at the end of the partition plate, and an arc groove 21 is engraved on the last-stage chamber partition plate, and energy-absorbing balls 20 are embedded in the arc groove. The number of energy-absorbing balls 20 can be determined according to the preset resistance working conditions. A flow hole 14 is provided on the partition plate below the energy-absorbing ball to guide the medium to the flow chamber 15, and then flow out through the outlet 18.

[0038] according to Figure 4 As shown, in the last stage chamber, there is a reset chamber housing 17, in which a reset spring 16 is installed, and a limit buckle 12 is provided at the top of the reset chamber to prevent the closing piston 4 from rebounding too much and blocking the inlet 1, and a sealing ring 13 is provided at the end of the limit buckle to prevent the medium from penetrating into the reset chamber.

[0039] according to Figure 4 As shown, the upper part of the closed piston 4 is an arc surface 5, the top outer ring is chamfered 6, an arc groove is engraved on the piston isolation plate 9, a piston closing ring 7 is installed on the groove, and piston support ribs 11 are staggered at the intersection of the closed piston 7 and the partition plate 20. The medium flows through the gap between the piston support ribs 11, and the bottom of the closed piston 4 is installed below the limit buckle 12.

[0040] according to Fig.10 As shown, in the normal working state of the underwater automatic reset explosion-proof device in this embodiment, the arrow represents the medium therein, the medium enters the explosion-proof valve through the inlet 1, is first guided by the arc surface 5, enters the first chamber after the guidance, passes through the lower flow channel 8 between the piston sealing ring 7 and the partition plate 20, then passes through the upper flow channel 3, passes through the gap between the piston support ribs 11, enters the next chamber, until the last chamber, and then passes through the gap between the energy absorbing balls 19, flows into the flow hole 14, and finally merges into the flow chamber 15, and flows out through the outlet 18. The reset spring 16 is in the maximum extension state.

[0041] according to Fig.11 As shown, when the shock wave comes, the explosion-proof valve of the underwater automatic reset explosion-proof device is in the closed state. When the shock wave comes in the medium, the shock wave acts on the arc surface 5, pushing the closed piston 4 to move in the outflow direction, compressing the reset spring 16 and the piston sealing ring 7, and making the closed piston 4 contact with the sealing gasket 10, so as to achieve the sealing effect and isolate the impact energy. Repeat this process in the next chamber. During the closing process of the closed piston 4, the impact energy is absorbed by the reset spring 16 and the piston sealing ring 7. In the last chamber, the medium is squeezed during the closing process of the device, and then the energy-absorbing ball 19 is squeezed. By compressing its deformation, it gives the medium flow space to prevent the medium from transmitting the impact energy to the rear equipment. When the shock wave dissipates, the medium pressure at the inlet 1 returns to the normal working level, the reset spring 16 is backfilled, and the closed piston 4 is pushed back to the normal working state. The flow channel opens and the explosion-proof valve can work normally.

[0042] If the designed shock wave energy is larger, the number of chambers can be increased, and then the number of piston sealing rings 7 can be increased so that it can absorb more shock energy.

[0043] Before using the underwater automatic reset explosion-proof device of the present invention, the air tightness of the valve body, the smoothness of the flow channel, the activity of the closing piston 4, and the resilience of the reset spring 16 are checked.

[0044] Connect the outlet to the inside of the pipeline and the outlet to the position in contact with the external medium. After installation, check the air tightness of the valve body, the smoothness of the flow channel, the activity of the closing piston 4, and the resilience of the return spring 16.

[0045] In summary, the present invention provides an underwater automatic resetting explosion-proof device and a shock wave isolation method. The underwater automatic resetting explosion-proof device has a simple appearance, a compact size, a simple internal structure, and each component is easy to process and install. When in use, a special energy-absorbing structure can absorb the impact energy very well, and the energy-absorbing device can also absorb the extrusion energy generated by the medium during the closing process, thereby protecting the valve post-valve equipment and mechanical devices such as the valve housing to the greatest extent, and has good durability. After the explosion-proof valve is closed by the induction shock wave, it can reset itself without human intervention and return to normal working state, which greatly facilitates daily use. The sealing gaskets arranged between the various structures in the present invention can ensure the sealing effect when the flow channel needs to be blocked, and the sealing ring of the reset cavity mouth can prevent the medium from flowing into the sealing cavity, damaging the reset spring or affecting the reset effect.

[0046] In the present invention, multiple energy absorption rings are arranged inside the valve body, which can fully absorb the impact energy, reduce the energy transfer to the rear, and improve the durability of the valve body itself. The last chamber is equipped with an energy-absorbing ball, which can absorb the energy applied to the medium by the motor device in the valve during the closing process, and avoid the energy in the closing process from causing damage to the rear equipment. A reset device is installed at the bottom of the closed piston to avoid the need for manual intervention to resume work after each explosion-proof work, and the reset device has a limit buckle to prevent the piston from rebounding too much and blocking the inlet.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An underwater automatic reset explosion-proof device, characterized in that: The explosion-proof valve body (2) comprises an explosion-proof valve body (2), wherein the top end of the explosion-proof valve body (2) is provided with an inlet (1), and the bottom end is provided with an outlet (18); a sealing piston (4) is provided in the explosion-proof valve body (2) for blocking the medium entering the inlet (1); the inner chamber of the explosion-proof valve body (2) is provided with a plurality of rows of partition plates (20) horizontally along the direction from the inlet (1) to the outlet (18), the plurality of rows of partition plates (20) are coaxially provided with flow holes, and the plurality of rows of partition plates (20) divide the inner chamber of the explosion-proof valve body (2) into a plurality of chambers, wherein the plurality of chambers comprises a plurality of piston ring chambers and energy absorbing ball chambers; wherein the energy absorbing ball chamber is arranged close to the outlet (18), and a reset unit is provided in the energy absorbing ball chamber, and the energy absorbing ball chamber is connected to the outlet (18); the sealing piston (4) comprises a plurality of piston isolation plates (9) and a connecting rod (22), and each piston isolation plate (9) is correspondingly distributed In each piston ring chamber, each piston isolation plate (9) is connected along the flow holes of each row of partition plates (20) via a connecting rod (22), one end of the connecting rod (22) is connected to a reset unit of the energy absorbing ball chamber, and is used to drive the connecting rod (22) and drive each piston isolation plate (9) to seal the medium in the chamber through the reset unit; in each piston ring chamber, a plurality of piston sealing rings (7) are symmetrically arranged around the connecting rod (22), and the plurality of piston sealing rings (7) are staggeredly arranged on the piston isolation plate (9) and the partition plate (20), and the staggered gaps form a medium flow path, and a gap is arranged between the connecting rod (22) and the flow holes of each row of partition plates (20); in the energy absorbing ball chamber, energy absorbing balls (19) are symmetrically arranged around the reset unit, and are used to absorb energy transmitted to the outlet (18) by the sealing piston (4) during the closing process.

2. An underwater automatic reset explosion-proof device according to claim 1, characterized in that: A lower flow channel (8) is arranged in the piston ring chamber at a position of the partition plate (20) corresponding to the piston sealing ring (7) arranged on the piston isolation plate (9), and an upper flow channel (3) is arranged at a position of the piston isolation plate (9) corresponding to the piston sealing ring (7) on the partition plate (20), wherein both the lower flow channel (8) and the upper flow channel (3) are arranged in a concave manner, and the concave surface corresponds to the annular surface of the piston sealing ring (7).

3. The underwater automatic reset explosion-proof device according to claim 1, characterized in that: The top surface of the piston isolation plate (9) close to the inlet (1) is an arc surface (5), and the outer circle of the top surface of the piston isolation plate (9) is chamfered (6).

4. The underwater automatic reset explosion-proof device according to claim 1, characterized in that: The connecting rod (22) is provided with a blocking block at the upper end of the flow hole of each row of partition plates (20), and the diameter of the blocking block is larger than the aperture of the flow hole.

5. The underwater automatic reset explosion-proof device according to claim 4, characterized in that: A sealing gasket (10) is provided at the upper end of the circulation hole, and the blocking block is arranged in contact with the sealing gasket (10).

6. The underwater automatic reset explosion-proof device according to claim 1, characterized in that: The connecting rod (22) has piston supporting ribs (11) arranged alternately between the flow holes of each row of partition plates (20).

7. The underwater automatic reset explosion-proof device according to claim 1, characterized in that: The reset unit comprises a reset chamber housing (17), a reset spring (16) is fixedly arranged in the reset chamber housing (17), the connecting rod (22) is fixedly connected to the reset spring (16), and limiting buckles (12) are arranged at both ends of the top of the reset chamber housing (17) for limiting the connecting rod (22) in the reset chamber housing (17), and a sealing ring (13) is arranged between the limiting buckle (12) and the connecting rod (22).

8. The underwater automatic reset explosion-proof device according to claim 1, characterized in that: The upper and lower partition plates (20) in the energy absorbing ball chamber are provided with arc-shaped grooves (21), and the energy absorbing ball is placed in the arc-shaped grooves (21).

9. The underwater automatic reset explosion-proof device according to claim 1, characterized in that: A flow chamber (15) is provided between the energy absorbing ball chamber and the flow outlet (18); the flow chamber (15) is in communication with the flow outlet (18); and two sides of the flow chamber (15) are in communication via flow holes (14).

10. A method for isolating shock waves of an underwater automatic reset explosion-proof device, based on the underwater automatic reset explosion-proof device according to any one of claims 1 to 9, characterized in that: The steps include: After the medium shock wave enters the inlet (1) at the top of the explosion-proof valve body (2), it acts on the piston isolation plate (9) in the first layer of the piston ring chamber and pushes the piston isolation plate (9) to move the entire closed piston (4) toward the outlet (18), so that the piston isolation plate (9) compresses the closed ring (7), the connecting rod (22) compresses the reset unit, and each layer of the piston isolation plate (9) is sealed to the flow hole of the partition plate (20), thereby achieving a sealing effect and isolating the shock energy; during the sealing process of the closed piston (4), the shock energy is restored. The explosion-proof valve body (2) is closed by the sealing piston (4) in the energy-absorbing ball chamber, so that the medium is squeezed, thereby squeezing the energy-absorbing ball (19). The energy-absorbing ball (19) is compressed to deform and provide space for the medium to flow, thereby preventing the medium from transmitting the impact energy to the rear equipment. When the shock wave dissipates, the medium pressure at the inlet (1) returns to the normal working level, the reset unit is backfilled, and the sealing piston (4) is pushed back to the normal working state. The medium flow channel is opened, and the explosion-proof valve body (2) can work normally.

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