External supercharging device for vehicle-mounted LNG (Liquefied Natural Gas) cylinder

Abstract

The invention discloses a vehicle-mounted LNG cylinder external supercharging device, and relates to the technical field of vehicle-mounted LNG cylinders, the vehicle-mounted LNG cylinder external supercharging device comprises a mounting plate, a cover plate is rotatably mounted at the top of the mounting plate, a supercharging device is fixedly mounted at the rear part of the mounting plate, a gas cylinder is arranged at the top of the mounting plate, and the gas cylinder is fixedly mounted at the rear part of the mounting plate. A gas inlet is fixedly formed in the left side of the gas cylinder, a valve is fixedly mounted on the circumferential surface of the gas inlet, a protection device is arranged at the top of the mounting plate, a leakage-proof device is arranged at the top of the mounting plate, and a connecting device is arranged at the top of the mounting plate. According to the device, a gas cylinder is placed on the top of the mounting plate, the cover plate is rotated downwards, the cover plate is rotated downwards to make contact with the inclined face of the top of the spring bolt, the spring bolt is stressed to retract into the switch box, the cover plate continues to be rotated downwards, when the spring bolt makes contact with the pressing block, the spring bolt stretches out under the elastic force of the third elastic piece, the spring bolt limits the cover plate, and the cover plate is prevented from being in the operation process of the device.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle-mounted LNG gas cylinders, and in particular to an external pressurizing device for a vehicle-mounted LNG gas cylinder. Background Art

[0002] Liquefied natural gas (LNG for short) is a clean energy source recognized by the world today. It has the advantages of high calorific value, complete combustion, low price, good transportation economy and good safety, and is deeply loved by the majority of users.

[0003] The patent with the patent announcement number CN211315759U relates to a detachable LNG vehicle-mounted gas cylinder boosting device, in which a first mounting hole is provided at the lower part of any outer head of the outer shell of the horizontally arranged LNG vehicle-mounted gas cylinder, and a second mounting hole is provided at the lower part of the inner head of the inner liner on the same side as the first mounting hole. The front end of the double-layer casing filled with an insulation layer in the middle interlayer is sealed and passes through the first mounting hole and the second mounting hole in sequence and then extends into the inner liner. A joint is fixedly provided at the front end of the double-layer casing located in the inner liner, and a power signal adapter is fixedly provided at the rear end of the double-layer casing located outside the outer shell. A heating device is provided in the double-layer casing, and the heating device includes: a support member, and a heating element with a temperature sensor fixed to the front end of the support member, and the power line of the heating element and the signal line of the temperature sensor are connected to the power signal adapter. The above structure has the advantages of stable and reliable boosting and convenient maintenance and replacement of the heating device. The above patent solves the problems of pressurization stability and maintenance and replacement of heating devices, but ignores the fact that LNG vehicle-mounted gas cylinders have no external protection and explosion-proof measures. If the external protection problem of LNG vehicle-mounted gas cylinders is not solved, there will be great safety hazards in LNG vehicle-mounted gas cylinders. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an on-vehicle LNG cylinder external pressurizing device, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an on-vehicle LNG cylinder external pressurizing device, comprising a mounting plate, a cover plate is rotatably mounted on the top of the mounting plate, a pressurizing device is fixedly mounted on the rear of the mounting plate, a gas cylinder is arranged on the top of the mounting plate, an air inlet is fixedly mounted on the left side of the gas cylinder, a valve is fixedly mounted on the circumferential surface of the air inlet, a protective device is arranged on the top of the mounting plate, an anti-leakage device is arranged on the top of the mounting plate, and a connecting device is arranged on the top of the mounting plate; The protective device includes a pressing block, a locking tongue, a switch box, a No. 1 protective plate, an L-shaped rod, a No. 2 protective plate and a moving rod. The pressing block slides through the front of the cover plate, the switch box is fixedly installed on the top of the mounting plate, a sliding groove is provided at the front of the switch box, the locking tongue is slidably installed inside the sliding groove, a mounting groove is provided on the top of the mounting plate, the No. 1 protective plate is slidably installed inside the mounting groove, the No. 2 protective plate is slidably installed inside the mounting groove, the L-shaped rod is fixedly installed on the left side of the No. 1 protective plate, the L-shaped rod slides through the No. 2 protective plate, the moving rod is fixedly installed on the left side of the No. 2 protective plate, and the moving rod slides through the L-shaped rod. A valve is arranged on the circumferential surface of the air inlet, so that the air inlet is closed after the valve is rotated, thereby preventing the gas cylinder from being hit by the impact force caused by the collision, causing the internal gas to leak through the air inlet, and avoiding the possibility of explosion caused by gas leakage.

[0006] According to the above technical solution, two mounting grooves are provided, and the mounting grooves are respectively located at the left and right ends of the mounting plate. The No. 1 protective plate and the No. 2 protective plate are respectively installed in the left and right mounting grooves. A No. 1 spring plate is fixedly installed between the No. 1 protective plate and the mounting plate, and a No. 2 spring plate is fixedly installed between the No. 2 protective plate and the mounting plate. By setting the elastic force of the No. 1 spring plate and the No. 2 spring plate, a force is applied to the No. 1 protective plate and the No. 2 protective plate to prevent the No. 1 protective plate and the No. 2 protective plate from moving without being hit.

[0007] According to the above technical solution, the pressing block contacts the lock tongue, and a No. 3 spring sheet is fixedly installed between the lock tongue and the switch box. By providing the No. 3 spring sheet, the lock tongue is pushed out when the lock tongue contacts the pressing block, thereby limiting the cover plate.

[0008] According to the above technical scheme, the anti-leakage device includes an air outlet, a baffle, a connecting column, a return spring, a pressing plate, an exhaust pipe, a circular plate and a fixed plate. A through hole is opened on the left side of the gas cylinder, the air outlet is fixedly installed inside the through hole, the fixed plate is fixedly installed inside the air outlet, the connecting column slides through the fixed plate, the baffle is fixedly installed at one end of the connecting column, the pressing plate is fixedly installed at the other end of the connecting column, one end of the return spring is fixedly installed on the left side of the fixing plate, the other end of the return spring is fixedly installed on the right side of the pressing plate, the exhaust pipe is fixedly installed on the left side of the fixing plate, and the circular plate is fixedly installed on the left side of the exhaust pipe. By arranging the anti-leakage device, the air outlet is in a closed state when it is not connected to the pipeline, and the gas inside the gas cylinder cannot flow out through the air outlet.

[0009] According to the above technical solution, the circumference of the baffle is in contact with the inner wall of the air outlet, there are multiple connecting columns, and the connecting columns are evenly distributed between the fixed plate and the pressing plate. A limiting groove is provided on the circumferential surface of the air outlet, so that when the connecting pipe and the air outlet fall off, the baffle is in contact with the fixed plate due to the elastic force of the return spring, thereby preventing gas from flowing into the exhaust pipe.

[0010] According to the above technical solution, a plurality of open grooves are evenly opened on the circumferential surface of the exhaust pipe, and the circular plate contacts the pressing plate, so that when the connecting pipe is not connected to the air outlet, the circular plate contacts the pressing plate to prevent gas from leaking through the exhaust pipe.

[0011] According to the above technical scheme, the connecting device includes a connecting pipe, a fixed ring, a movable ring, a connecting plate, an inclined plate, a block and a short pipe. A conduit is fixedly installed on the left side of the boosting device, the connecting pipe is fixedly installed on the side of the conduit away from the boosting device, the fixed ring is fixedly installed on the circumferential surface of the connecting pipe, the movable ring is slidably installed on the circumferential surface of the fixed ring, a positioning groove is provided on the circumferential surface of the fixed ring, the connecting plate is fixedly installed inside the fixed ring, the inclined plate is fixedly installed on the bottom of the connecting plate, a square groove is provided on the right side of the fixed ring, the block is slidably installed inside the square groove, and the short pipe is fixedly installed on the right side of the connecting pipe. The connecting device is provided to realize quick installation and disassembly with the gas outlet, and the gas inside the gas cylinder can flow out only when the connecting device is connected to the gas outlet, so that the safety of the invention is high.

[0012] According to the above technical solution, the left and right ends of the card block are set as inclined surfaces, the inclined panel is in contact with the card block, and a No. 4 spring piece is fixedly installed between the card block and the fixed ring. The card block is in contact with the inclined surface of the inclined panel, thereby realizing rapid disassembly between the connecting device and the air outlet.

[0013] The present invention provides an external booster device for a vehicle-mounted LNG cylinder, which has the following beneficial effects: (1) The invention places the gas cylinder on the top of the mounting plate, rotates the cover downward, and the cover rotates downward to contact the inclined surface on the top of the lock tongue. The lock tongue is forced to retract into the switch box, and the cover continues to rotate downward. When the lock tongue contacts the pressing block, the lock tongue is extended by the elastic force of the No. 3 spring sheet, and the lock tongue limits the cover plate to prevent the cover plate from being easily opened during the operation of the device, causing the gas cylinder to be exposed to the outside, which will increase the probability of safety accidents. When the No. 1 protective plate is hit by external force, the No. 1 protective plate is forced to move, and the movement of the No. 1 protective plate drives the L-shaped rod to move. The L-shaped rod moves and contacts the valve. The L-shaped rod continues to move and drives the valve to rotate. The valve rotates and closes. The closure of the valve prevents the gas inside the gas cylinder from leaking through the air inlet. Through the movement of the protective plate, the device closes the valve when it is hit, thereby preventing the gas cylinder from being hit by the impact force generated by the impact and causing internal gas leakage, avoiding the possibility of explosion after gas leakage.

[0014] (2) In the invention, when the worker fully inserts the short rod into the gas outlet, the short rod contacts the pressing plate, and the movement of the short rod drives the pressing plate to move. The movement of the pressing plate drives the connecting column to move. The movement of the connecting column drives the baffle to move. The movement of the baffle exposes the gas outlet, and the gas inside the gas cylinder flows out through the gas outlet. In this way, when the connecting pipe connected to the gas outlet falls off, the pressed return spring resets the pressing plate, and the baffle contacts the fixing plate, and the circular plate contacts the pressing plate, thereby preventing the gas inside the gas cylinder from flowing out through the gas outlet, reducing the possibility of safety accidents.

[0015] (3) In the present invention, when the short rod is inserted into the air outlet, the movement of the short rod drives the connecting pipe to move, the movement of the connecting pipe drives the fixing ring to move, the movement of the fixing ring drives the block to move, the block contacts the air outlet, the inclined surface of the block contacts the air outlet, the short rod continues to enter the air outlet to move the block, the short rod continues to enter the air outlet to make the block engage in the limiting groove, the fixing ring is limited by the block entering the limiting groove, so that the connecting pipe and the air outlet are connected more tightly, when it is necessary to disassemble the connecting device, the moving ring is pushed in the direction of the block, the moving ring moves and drives the connecting plate to move, and the connecting device can be quickly disassembled by moving the moving ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the complete structure of the present invention; Figure 2 It is a schematic diagram of the position structure of the supercharging device of the present invention; Figure 3 This is a schematic diagram of the L-shaped rod position structure of the present invention; Figure 4 This is a schematic diagram of the gas outlet position structure of the present invention; Figure 5 It is a schematic diagram of the structure of the anti-leakage device of the present invention; Figure 6 It is a schematic diagram of the structure of the connecting device of the present invention; Figure 7 For the present invention Figure 1 A schematic diagram of the enlarged structure of part A.

[0017] In the figure: 1. mounting plate; 2. pressurizing device; 3. gas cylinder; 4. cover plate; 501. pressing block; 502. locking tongue; 503. switch box; 504. No. 1 protective plate; 505. L-shaped rod; 506. No. 2 protective plate; 507. moving rod; 601. air outlet; 602. baffle; 603. connecting column; 604. return spring; 605. pressing plate; 606. exhaust pipe; 607. round plate; 608. fixing plate; 701. connecting pipe; 702. fixing ring; 703. moving ring; 704. connecting plate; 705. inclined plate; 706. block; 707. short pipe; 8. conduit; 9. air inlet; 10. valve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 7 , one embodiment of the present invention is: an on-vehicle LNG cylinder external pressurizing device, comprising a mounting plate 1, a cover plate 4 is rotatably mounted on the top of the mounting plate 1, a pressurizing device 2 is fixedly mounted on the rear of the mounting plate 1, a gas cylinder 3 is arranged on the top of the mounting plate 1, an air inlet 9 is fixedly mounted on the left side of the gas cylinder 3, a valve 10 is fixedly mounted on the circumferential surface of the air inlet 9, a protective device is arranged on the top of the mounting plate 1, an anti-leakage device is arranged on the top of the mounting plate 1, and a connecting device is arranged on the top of the mounting plate 1; The protective device includes a pressing block 501, a locking tongue 502, a switch box 503, a first protective plate 504, an L-shaped rod 505, a second protective plate 506 and a moving rod 507. The pressing block 501 slides through the front of the cover plate 4, the switch box 503 is fixedly installed on the top of the mounting plate 1, a sliding groove is opened in the front of the switch box 503, the locking tongue 502 is slidably installed in the sliding groove, the top of the mounting plate 1 is opened, the first protective plate 504 is slidably installed in the mounting groove, and the second protective plate 506 is slidably installed in the mounting groove. Inside the groove, the L-shaped rod 505 is fixedly installed on the left side of the No. 1 protective plate 504, and the L-shaped rod 505 slides through the No. 2 protective plate 506. The moving rod 507 is fixedly installed on the left side of the No. 2 protective plate 506, and the moving rod 507 slides through the L-shaped rod 505. By arranging a valve 10 on the circumferential surface of the air inlet 9, the air inlet 9 is closed after the valve 10 is rotated, thereby preventing the gas cylinder 3 from being hit by the impact force caused by the collision, causing the internal gas to leak through the air inlet 9, and avoiding the possibility of explosion caused by gas leakage.

[0020] There are two mounting grooves, which are respectively located at the left and right ends of the mounting plate 1. The No. 1 protective plate 504 and the No. 2 protective plate 506 are respectively installed in the left and right mounting grooves. A No. 1 spring is fixedly installed between the No. 1 protective plate 504 and the mounting plate 1, and a No. 2 spring is fixedly installed between the No. 2 protective plate 506 and the mounting plate 1. By setting the elastic force of the No. 1 spring and the No. 2 spring, a force is applied to the No. 1 protective plate 504 and the No. 2 protective plate 506 to prevent the No. 1 protective plate 504 and the No. 2 protective plate 506 from moving without being hit.

[0021] The pressing block 501 contacts the lock tongue 502 , and a No. 3 spring piece is fixedly installed between the lock tongue 502 and the switch box 503 . By providing the No. 3 spring piece, when the lock tongue 502 contacts the pressing block 501 , the lock tongue 502 is pushed out to limit the cover plate 4 .

[0022] Place the gas cylinder 3 on the top of the mounting plate 1, and rotate the cover plate 4 downward. The cover plate 4 rotates downward and contacts the inclined surface at the top of the lock tongue 502. The lock tongue 502 is forced to retract into the switch box, and the cover plate 4 continues to rotate downward. When the lock tongue 502 contacts the pressing block 501, the lock tongue 502 extends out due to the elastic force of the No. 3 spring piece, and the lock tongue 502 limits the cover plate 4. When the No. 1 protective plate 504 is hit by an external force, the No. 1 protective plate 504 is forced to move, and the movement of the No. 1 protective plate 504 drives the L-shaped rod 505 to move. The L-shaped rod 505 moves and contacts the valve 10. The L-shaped rod 505 continues to move and drives the valve 10 to rotate. The valve 10 rotates and is closed. The closure of the valve 10 prevents the gas inside the gas cylinder 3 from leaking through the air inlet 9. When the No. 2 protective plate 506 is hit by an external force, the No. 2 protective plate 506 moves under the force. The movement of the No. 2 protective plate 506 drives the moving rod 507 to move. The moving rod 507 moves and contacts the valve 10. The moving rod 507 continues to move and drives the valve 10 to rotate. The valve 10 rotates and is closed. The closure of the valve 10 prevents the gas inside the gas cylinder 3 from leaking through the air inlet 9, thereby preventing the gas cylinder 3 from being hit by the impact force generated by the collision and causing internal gas leakage, thereby avoiding the possibility of explosion caused by gas leakage.

[0023] The anti-leakage device includes an air outlet 601, a baffle 602, a connecting column 603, a return spring 604, a pressing plate 605, an exhaust pipe 606, a circular plate 607 and a fixing plate 608. A through hole is opened on the left side of the gas cylinder 3, the air outlet 601 is fixedly installed inside the through hole, the fixing plate 608 is fixedly installed inside the air outlet 601, the connecting column 603 slides through the fixing plate 608, the baffle 602 is fixedly installed at one end of the connecting column 603, the pressing plate 605 is fixedly installed at the other end of the connecting column 603, one end of the return spring 604 is fixedly installed on the left side of the fixing plate 608, the other end of the return spring 604 is fixedly installed on the right side of the pressing plate 605, the exhaust pipe 606 is fixedly installed on the left side of the fixing plate 608, and the circular plate 607 is fixedly installed on the left side of the exhaust pipe 606. By setting the anti-leakage device, the air outlet 601 is in a closed state when it is not connected to the pipeline, and the gas inside the gas cylinder 3 cannot flow out through the air outlet 601.

[0024] The circumference of the baffle 602 is in contact with the inner wall of the air outlet 601. There are multiple connecting columns 603, which are evenly distributed between the fixed plate 608 and the pressing plate 605. A limiting groove is provided on the circumferential surface of the air outlet 601. When the connecting pipe and the air outlet 601 fall off, the baffle 602 is in contact with the fixed plate 608 by the elastic force of the return spring 604, thereby preventing gas from flowing into the exhaust pipe 606.

[0025] A plurality of open grooves are evenly arranged on the circumferential surface of the exhaust pipe 606 , and the circular plate 607 contacts the pressing plate 605 , so that when the connecting pipe is not connected to the gas outlet 601 , the circular plate 607 contacts the pressing plate 605 to prevent gas from leaking through the exhaust pipe 606 .

[0026] The connecting device includes a connecting pipe 701, a fixed ring 702, a movable ring 703, a connecting plate 704, an inclined plate 705, a block 706 and a short tube 707. A conduit 8 is fixedly installed on the left side of the boosting device 2. The connecting pipe 701 is fixedly installed on the side of the conduit 8 away from the boosting device 2. The fixed ring 702 is fixedly installed on the circumferential surface of the connecting pipe 701. The movable ring 703 is slidably installed on the circumferential surface of the fixed ring 702. A positioning groove is provided on the circumferential surface of the fixed ring 702. The connecting plate 704 is fixedly installed inside the fixed ring 702. The inclined plate 705 is fixedly installed at the bottom of the connecting plate 704. A square groove is provided on the right side of the fixed ring 702. The block 706 is slidably installed inside the square groove. The short tube 707 is fixedly installed on the right side of the connecting pipe 701. The connecting device is provided to achieve quick installation and disassembly with the gas outlet 601. Only when the connecting device is connected to the gas outlet 601 can the gas inside the gas cylinder 3 flow out, so that the safety of the invention is high.

[0027] The left and right ends of the block 706 are set as inclined surfaces, the inclined panel 705 contacts the block 706, and a No. 4 spring is fixedly installed between the block 706 and the fixing ring 702. The block 706 contacts the inclined surface of the inclined panel 705, thereby realizing the quick disassembly between the connecting device and the air outlet 601.

[0028] When the device is working, when the worker completely inserts the short rod 707 into the air outlet 601, the short rod 707 contacts the pressing plate 605, and the movement of the short rod 707 drives the pressing plate 605 to move. The movement of the pressing plate 605 drives the connecting column 603 to move. The movement of the connecting column 603 drives the baffle 602 to move. The movement of the baffle 602 exposes the air outlet, and the gas inside the gas cylinder 3 flows out through the air outlet 601.

[0029] When the short rod 707 is inserted into the air outlet 601, the movement of the short rod 707 drives the connecting pipe 701 to move, the movement of the connecting pipe 701 drives the fixing ring 702 to move, the movement of the fixing ring 702 drives the block 706 to move, the block 706 contacts the air outlet 601, the inclined surface of the block 706 contacts the air outlet 601, the short rod 707 continues to enter the air outlet 601 to move the block 706, the short rod 707 continues to enter the air outlet 601 to make the block 706 snap into the limiting groove, so that the block 706 limits the fixing ring 702. When it is necessary to disassemble the connecting device, the moving ring 703 is pushed in the direction of the block 706, the moving ring 703 moves to drive the connecting plate 704 to move, the connecting plate 704 moves to drive the inclined plate 705 to move, the inclined plate 705 moves to make the block 706 move upward, the block 706 moves upward to release the limit on the fixing ring 702, the short tube 707 is pulled out, and the disassembly is completed.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted LNG cylinder external pressurizing device, comprising a mounting plate (1), characterized in that: A cover plate (4) is rotatably mounted on the top of the mounting plate (1), a pressure boosting device (2) is fixedly mounted on the rear of the mounting plate (1), a gas cylinder (3) is arranged on the top of the mounting plate (1), an air inlet (9) is fixedly mounted on the left side of the gas cylinder (3), a valve (10) is fixedly mounted on the circumferential surface of the air inlet (9), a protective device is arranged on the top of the mounting plate (1), an anti-leakage device is arranged on the top of the mounting plate (1), and a connecting device is arranged on the top of the mounting plate (1); The protective device comprises a pressing block (501), a locking tongue (502), a switch box (503), a first protective plate (504), an L-shaped rod (505), a second protective plate (506) and a moving rod (507); the pressing block (501) slides through the front of the cover plate (4); the switch box (503) is fixedly mounted on the top of the mounting plate (1); a sliding groove is provided at the front of the switch box (503); the locking tongue (502) is slidably mounted inside the sliding groove; the mounting plate (1) A mounting groove is provided at the top, the first protective plate (504) is slidably mounted inside the mounting groove, the second protective plate (506) is slidably mounted inside the mounting groove, the L-shaped rod (505) is fixedly mounted on the left side of the first protective plate (504), the L-shaped rod (505) slidably penetrates the second protective plate (506), the moving rod (507) is fixedly mounted on the left side of the second protective plate (506), and the moving rod (507) slidably penetrates the L-shaped rod (505).

2. The vehicle-mounted LNG cylinder external pressurizing device according to claim 1 is characterized in that: Two mounting grooves are provided, and the mounting grooves are respectively located at the left and right ends of the mounting plate (1); the first protective plate (504) and the second protective plate (506) are respectively installed inside the left and right mounting grooves; a first spring sheet is fixedly installed between the first protective plate (504) and the mounting plate (1); and a second spring sheet is fixedly installed between the second protective plate (506) and the mounting plate (1).

3. The vehicle-mounted LNG cylinder external pressurizing device according to claim 2 is characterized in that: The pressing block (501) contacts the locking tongue (502), and a third spring piece is fixedly installed between the locking tongue (502) and the switch box (503).

4. The vehicle-mounted LNG cylinder external pressurizing device according to claim 3 is characterized in that: The anti-leakage device comprises an air outlet (601), a baffle (602), a connecting column (603), a return spring (604), a pressing plate (605), an exhaust pipe (606), a circular plate (607) and a fixing plate (608); a through hole is opened on the left side of the gas cylinder (3); the air outlet (601) is fixedly installed inside the through hole; the fixing plate (608) is fixedly installed inside the air outlet (601); and the connecting column (603) slides through the fixing plate (608). The baffle (602) is fixedly mounted on one end of the connecting column (603), the pressing plate (605) is fixedly mounted on the other end of the connecting column (603), one end of the return spring (604) is fixedly mounted on the left side of the fixing plate (608), the other end of the return spring (604) is fixedly mounted on the right side of the pressing plate (605), the exhaust pipe (606) is fixedly mounted on the left side of the fixing plate (608), and the circular plate (607) is fixedly mounted on the left side of the exhaust pipe (606).

5. The vehicle-mounted LNG cylinder external pressurizing device according to claim 4 is characterized in that: The circumferential surface of the baffle plate (602) contacts the inner wall of the air outlet (601), a plurality of connecting columns (603) are provided, and the connecting columns (603) are evenly distributed between the fixing plate (608) and the pressing plate (605), and a limiting groove is provided on the circumferential surface of the air outlet (601).

6. The vehicle-mounted LNG cylinder external pressurizing device according to claim 5 is characterized in that: A plurality of open grooves are evenly arranged on the circumferential surface of the exhaust pipe (606), and the circular plate (607) is in contact with the pressing plate (605).

7. The vehicle-mounted LNG cylinder external pressurizing device according to claim 6 is characterized in that: The connecting device comprises a connecting pipe (701), a fixed ring (702), a movable ring (703), a connecting plate (704), an inclined plate (705), a clamping block (706) and a short pipe (707); a conduit (8) is fixedly installed on the left side of the boosting device (2); the connecting pipe (701) is fixedly installed on the side of the conduit (8) away from the boosting device (2); the fixing ring (702) is fixedly installed on the circumferential surface of the connecting pipe (701); the movable ring (703) is slidably installed on the circumferential surface of the fixing ring (702); a positioning groove is provided on the circumferential surface of the fixing ring (702); the connecting plate (704) is fixedly installed inside the fixing ring (702); the inclined plate (705) is fixedly installed at the bottom of the connecting plate (704); a square groove is provided on the right side of the fixing ring (702); the clamping block (706) is slidably installed inside the square groove; and the short pipe (707) is fixedly installed on the right side of the connecting pipe (701).

8. The vehicle-mounted LNG cylinder external pressurizing device according to claim 7 is characterized in that: The left and right ends of the clamping block (706) are arranged as inclined surfaces, the inclined panel (705) is in contact with the clamping block (706), and a fourth spring piece is fixedly installed between the clamping block (706) and the fixing ring (702).

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