A booster pump for air supply device

Abstract

The present invention discloses a booster pump for an air supply device, comprising: a pump body, a driving reversing device, a driving compression device, a driving cylinder tail cover, a compression cylinder tail cover and a partition; a driving reversing device is arranged on the left side of the upper end of the pump body; a driving compression device is arranged inside the pump body, and the driving compression device and the driving reversing device are used in coordination; the partition is arranged in the longitudinal middle of the driving compression device; the driving cylinder tail cover is arranged on the left side of the pump body; the compression cylinder tail cover is arranged on the right side of the pump body; the driving cylinder tail cover and the compression cylinder tail cover are both coordinated with the driving compression device. The present invention has a reasonable design, is convenient to use, and has high working efficiency. By utilizing the power of compressed air to pressurize natural gas, the problem of slow supercharging speed and great environmental influence of the original self-supercharging system is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of booster pumps, and in particular to a booster pump used in an air supply device. Background Art

[0002] During the use of LNG vehicles, as the gas is consumed, the liquid level in the on-board LNG cylinder gradually decreases, and the pressure in the bottle also gradually decreases. If the pressure in the bottle is lower than 0.6MPa, the gas supply system cannot meet the normal gas supply demand of the engine, the vehicle power decreases or even stalls. At present, on-board LNG cylinders generally adopt the self-pressurization method of gasification and pressurization. Its working principle is: to make part of the liquid natural gas flow through the supercharged vaporizer and return to the cylinder to achieve the purpose of supercharging. The disadvantages of this supercharging method are obvious: 1. The liquid inlet and gas outlet of the supercharged vaporizer are directly connected to the LNG cylinder, there is no pressure difference between the inlet and outlet, and the flow rate is slow and cannot be controlled. 2. The supercharger vaporizer needs to exchange heat with the environment, and the vaporization speed is greatly affected by the ambient temperature. 3. When the liquid level in the LNG cylinder is low, the gas space in the bottle is large, and the supercharging takes a long time. At this time, the vehicle is underpowered or needs to stop and wait. Summary of the invention

[0003] The object of the present invention is to provide a booster pump for an air supply device.

[0004] To achieve the above object, the present invention adopts the following contents:

[0005] A booster pump for an air supply device comprises: a pump body, a driving reversing device, a driving compression device, a driving cylinder tail cover, a compression cylinder tail cover and a partition; the driving reversing device is arranged on the left side of the upper end of the pump body; the driving compression device is arranged inside the pump body, and the driving compression device and the driving reversing device are used in coordination; the partition is arranged in the longitudinal middle of the driving compression device; the driving cylinder tail cover is arranged on the left side of the pump body; the compression cylinder tail cover is arranged on the right side of the pump body; the driving cylinder tail cover and the compression cylinder tail cover are both coordinated with the driving compression device.

[0006] Preferably, the drive reversing device includes a No. 1 connecting rod, a No. 1 push rod, a No. 1 drive two-way air port, a No. 2 push rod, a No. 2 connecting rod, a No. 2 drive two-way air port and a reversing shaft; the No. 1 connecting rod is arranged at the left bottom end of the drive reversing device, and the No. 1 connecting rod extends into the drive cylinder tail cover; a No. 1 drive two-way air port is opened on the drive cylinder tail cover on the right side of the No. 1 connecting rod; a No. 1 push rod is arranged at the bottom end of the No. 1 connecting rod and the No. 1 drive two-way air port, and the No. 1 push rod passes through the drive cylinder tail cover and the drive A No. 2 connecting rod is arranged at the right bottom end of the driving reversing device, and the bottom end of the No. 2 connecting rod extends into the partition; a No. 2 driving two-way air port is opened on the partition on the right side of the No. 2 connecting rod; a No. 2 push rod is arranged at the bottom end of the No. 2 connecting rod and the No. 2 driving two-way air port, and the No. 2 push rod passes through the partition and cooperates with the driving compression device; a reversing shaft is arranged in the driving reversing device outside the No. 2 connecting rod, and the No. 2 connecting rod and the reversing shaft are used in cooperation with each other

[0007] Preferably, the driving compression device comprises a driving chamber, a driving piston, a compression chamber, a compression piston and a push rod; the driving chamber comprises a No. 1 driving chamber and a No. 2 driving chamber; the compression chamber comprises a No. 1 compression chamber and a No. 2 compression chamber; the driving chamber is arranged on the left side of the partition; the compression chamber is arranged on the right side of the partition; the driving piston is arranged in the internal longitudinal direction of the driving chamber; the compression piston is arranged in the internal longitudinal direction of the compression chamber; the push rod is arranged in the middle of the right side of the driving piston, and the push rod extends to the right through the partition and is fixed in the middle of the compression piston; the driving chamber on the left side of the driving piston is the No. 1 driving chamber, and the right side is the No. 2 driving chamber; the compression chamber on the left side of the compression piston is the No. 2 compression chamber, and the right side is the No. 1 compression chamber; the No. 1 driving two-way air port cooperates with the No. 1 driving chamber, and the No. 2 driving two-way air port cooperates with the No. 2 driving chamber; the No. 1 compression chamber one-way air inlet valve and the No. 1 compression chamber one-way air outlet valve are respectively arranged on the right side of the No. 1 compression chamber; the No. 2 compression chamber one-way air inlet valve and the No. 2 compression chamber one-way air outlet valve are respectively arranged on the left side of the No. 2 compression chamber.

[0008] Preferably, the drive cylinder tail cover comprises a compressed air pressure regulating knob, a natural gas pressure regulating knob, a compressed air inlet, a natural gas inlet, a sealing isolation piston, a No. 1 stop valve core, a No. 2 stop valve core and a compressed air outlet; the No. 1 stop valve core and the No. 2 stop valve core are respectively arranged inside the drive cylinder tail cover; a compressed air pressure regulating knob is arranged on the left side of the No. 1 stop valve core, and a compressed air inlet is arranged on the right side; a compressed air outlet is arranged at the bottom end of the drive cylinder tail cover, and the compressed air outlet is connected with the No. 1 stop valve core through a pipeline; a natural gas pressure regulating knob is arranged on the left side of the No. 2 stop valve core, and a natural gas feed port is arranged on the right side; a sealing isolation piston is arranged in the left pipeline of the natural gas inlet.

[0009] Preferably, the compression cylinder tail cover includes a ventilation function plate, a variable diameter coil spring, a one-way valve core, a natural gas one-way air inlet, a natural gas one-way air outlet and a compression cylinder tail seat; a ventilation function plate is arranged at the upper end of the compression cylinder tail seat; two pipes are arranged inside the compression cylinder tail seat, and one end of the pipe is arranged on the upper side of the interior of the compression cylinder tail seat, and the other end is arranged on the inner side of the compression cylinder tail seat; variable diameter coil springs are arranged inside the upper ends of the two pipes respectively; a one-way valve core is arranged in the pipe at the bottom end of the variable diameter coil spring; a natural gas one-way air inlet and a natural gas one-way air outlet are arranged at the ends of the two pipes respectively.

[0010] Preferably, the driving compression device comprises a driving chamber, a compression chamber, a driving piston, a compression piston and a push rod; a compression piston is arranged in the internal longitudinal direction of the compression chamber; the compression chamber on the left side of the compression piston is compression chamber No. 1, and the compression chamber on the right side is compression chamber No. 2; natural gas one-way air inlets are respectively arranged at the middle and upper ends of both sides of the compression chamber; natural gas one-way air outlets are respectively arranged at the middle and lower ends of both sides of the compression chamber; a driving piston is arranged in the internal longitudinal direction of the driving chamber; the driving chamber on the left side of the driving piston is driving chamber No. 1, and the driving chamber on the right side is driving chamber No. 2; compressed air two-way air ports are respectively arranged at the middle and upper ends of both sides of the driving chamber; the driving piston and the compression piston are connected by a push rod.

[0011] Preferably, the driving compression device comprises a compression chamber, a No. 1 driving chamber, a No. 2 driving chamber and a movable piston; movable pistons are respectively arranged in the longitudinal direction on both sides of the interior of the driving compression device; the cavity between the two movable pistons is the compression chamber; the left cavity of the left movable piston is the No. 1 driving chamber; the cavity of the right movable piston is the No. 2 driving chamber; two-way compressed air ports are respectively arranged on both sides of the driving compression device; and a one-way natural gas inlet and a one-way natural gas outlet are respectively arranged on both sides of the bottom end of the compression chamber.

[0012] Preferably, the driving compression device includes a compression chamber, a compression piston, a push rod and a motor-driven reciprocating mechanism; a compression piston is arranged in the inner longitudinal direction of the driving chamber; the compression chamber on the left side of the compression piston is compression chamber No. 1, and the compression chamber on the right side is compression chamber No. 2; natural gas one-way air inlets are arranged at the middle and upper ends of both sides of the compression chamber; natural gas one-way air outlets are arranged at the middle and lower ends of both sides of the compression chamber; a motor-driven reciprocating mechanism is arranged on the right side of the compression chamber; the compression piston and the motor-driven reciprocating mechanism are connected by a push rod.

[0013] The present invention has the following advantages:

[0014] The invention has reasonable design, convenient use and high working efficiency. It uses the power of compressed air to pressurize natural gas, thus overcoming the problems of slow supercharging speed and great environmental influence of the original self-supercharging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0016] Figure 1 The present invention is a schematic structural diagram of a booster pump used in an air supply device.

[0017] Figure 2 It is a structural schematic diagram of the driving cylinder tail cover of the present invention.

[0018] Figure 3 It is a structural schematic diagram of the compression cylinder tail cover of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the second driving compression device of the present invention.

[0020] Figure 5 It is a schematic structural diagram of the third driving compression device of the present invention.

[0021] Figure 6 It is a schematic structural diagram of a fourth driving compression device of the present invention.

[0022] In the figure, each reference numeral is:

[0023] 1- pump body, 2- drive reversing device, 21- No. 1 connecting rod, 22- No. 1 push rod, 23- No. 1 drive two-way air port, 24- No. 2 push rod, 25- No. 2 connecting rod, 26- No. 2 drive two-way air port, 27- reversing shaft, 3- drive compression device, 31- drive chamber, 32- compression chamber, 33- No. 1 drive chamber, 34- No. 2 drive chamber, 35- No. 1 compression chamber, 36- No. 2 compression chamber, 37- drive piston, 38- compression piston, 39- push rod, 310- No. 1 compression chamber one-way air inlet valve, 311- No. 2 compression chamber one-way air inlet valve, 312- No. 1 compression chamber one-way air outlet valve, 313- No. 2 compression chamber one-way air outlet valve, 4- drive Cylinder tail cover, 41-compressed air pressure regulating knob, 42-natural gas pressure regulating knob, 43-No. 1 stop valve core, 44-No. 2 stop valve core, 45-compressed air inlet, 46-compressed air outlet, 47-sealed isolation piston, 48-natural gas inlet, 5-compression cylinder tail cover, 51-ventilation function plate, 52-variable diameter spiral spring, 53-one-way valve core, 54-natural gas one-way air inlet, 55-natural gas one-way air outlet, 56-compression cylinder tail seat, 57-pipeline, 6-partition, 7-natural gas one-way air inlet, 8-natural gas one-way air outlet, 9-compressed air two-way air port, 10-moving piston, 11-motor driven reciprocating mechanism. DETAILED DESCRIPTION

[0024] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0025] like Figures 1 to 4 As shown, a booster pump for an air supply device comprises: a pump body 1, a driving reversing device 2, a driving compression device 3, a driving cylinder tail cover 4, a compression cylinder tail cover 5 and a partition 6; the driving reversing device 2 is arranged on the left side of the upper end of the pump body 1; the driving compression device 3 is arranged inside the pump body 1, and the driving compression device 3 and the driving reversing device 2 are used in coordination; the partition 6 is arranged in the longitudinal middle of the driving compression device 3, the driving cylinder tail cover 4 is arranged on the left side of the pump body 1, and the compression cylinder tail cover 5 is arranged on the right side of the pump body 1, and the driving cylinder tail cover 4 and the compression cylinder tail cover 5 are used in coordination with the driving compression device 3.

[0026] The driving reversing device 2 comprises a No. 1 connecting rod 21, a No. 1 push rod 22, a No. 1 driving two-way air port 23, a No. 2 push rod 24, a No. 2 connecting rod 25, a No. 2 driving two-way air port 26 and a reversing shaft 27; the No. 1 connecting rod 21 is arranged at the left bottom end of the driving reversing device 2, and the No. 1 connecting rod 21 extends into the driving cylinder tail cover 4, a No. 1 driving two-way air port 23 is opened on the driving cylinder tail cover 4 on the right side of the No. 1 connecting rod 21, a No. 1 push rod 22 is arranged at the bottom end of the No. 1 connecting rod 21 and the No. 1 driving two-way air port 23, and the No. 1 push rod 22 passes through the driving cylinder tail cover 4 and the driving cylinder A No. 2 connecting rod 25 is arranged at the bottom end on the right side of the driving reversing device 2, and the bottom end of the No. 2 connecting rod 25 extends into the partition 6, a No. 2 driving two-way air port 26 is opened on the partition 6 on the right side of the No. 2 connecting rod 25, a No. 2 push rod 24 is arranged at the bottom end of the No. 2 connecting rod 25 and the No. 2 driving two-way air port 26, and the No. 2 push rod 24 passes through the partition 6 and is used in coordination with the driving compression device 3, a reversing shaft 27 is arranged in the driving reversing device 2 outside the No. 2 connecting rod 25, and the No. 2 connecting rod 25 and the reversing shaft 27 are used in coordination with each other.

[0027] The driving and compressing device 3 comprises a driving chamber 31, a driving piston 37, a compression chamber 32, a compression piston 38 and a push rod 39; the driving chamber 31 comprises a No. 1 driving chamber 33 and a No. 2 driving chamber 34, and the compression chamber 32 comprises a No. 1 compression chamber 35 and a No. 2 compression chamber 36; the driving chamber 31 is arranged on the left side of the partition 6, and the compression chamber 32 is arranged on the right side of the partition 6; the driving piston 37 is arranged in the inner longitudinal direction of the driving chamber 31, and the compression piston 38 is arranged in the inner longitudinal direction of the compression chamber 32; a push rod 39 is arranged in the middle part of the right side of the driving piston 37, and the push rod 39 extends to the right through the partition 6 and is fixed in the middle part of the compression piston 38; The left driving chamber 31 of the driving piston 37 is the No. 1 driving chamber 33, and the right side is the No. 2 driving chamber 34. The left compression chamber 32 of the compression piston 38 is the No. 2 compression chamber 36, and the right side is the No. 1 compression chamber 35. The No. 1 driving two-way air port 23 cooperates with the No. 1 driving chamber 33, and the No. 2 driving two-way air port 26 cooperates with the No. 2 driving chamber 34. A No. 1 compression chamber one-way air inlet valve 310 and a No. 1 compression chamber one-way air outlet valve 312 are respectively arranged on the right side of the No. 1 compression chamber 35; a No. 2 compression chamber one-way air inlet valve 311 and a No. 2 compression chamber one-way air outlet valve 313 are respectively arranged on the left side of the No. 2 compression chamber 36.

[0028] The No. 1 drive chamber 33 enters compressed air, and the No. 2 drive chamber 34 exhausts air. At this time, the drive piston 37 moves rightward, and the natural gas in the No. 1 compression chamber 35 is compressed. When the compression piston 38 moves to the right to the limit position, the drive piston 37 touches the No. 2 push rod 24, and the No. 2 push rod 24 pushes the reversing shaft 27 to move to the right. The state of the air inlet changes to the No. 1 drive two-way air port 23 exhausts air, and the No. 2 drive two-way air port 26 intakes air. The drive piston 37 starts to move to the left, and the natural gas in the No. 2 compression chamber 36 is compressed. When the compression piston 38 moves to the left to the limit position, it touches the No. 1 push rod 22, and the state of the air inlet changes again, and this reciprocating cycle repeats.

[0029] like Figure 2 As shown, the drive cylinder tail cover 4 includes a compressed air pressure regulating knob 41, a natural gas pressure regulating knob 42, a compressed air inlet 45, a natural gas inlet 48, a sealing isolation piston 47, a No. 1 stop valve core 43, a No. 2 stop valve core 44 and a compressed air outlet 46; the No. 1 stop valve core 43 and the No. 2 stop valve core 44 are respectively arranged inside the drive cylinder tail cover 4; the compressed air pressure regulating knob 41 is arranged on the left side of the No. 1 stop valve core 43, and the compressed air inlet 45 is arranged on the right side; the compressed air outlet 46 is arranged at the bottom end of the drive cylinder tail cover 4, and the compressed air outlet 46 is connected with the No. 1 stop valve core 43 through a pipeline; the natural gas pressure regulating knob 42 is arranged on the left side of the No. 2 stop valve core 44, and the natural gas inlet 48 is arranged on the right side; and the sealing isolation piston 47 is arranged in the left pipeline of the natural gas inlet 48.

[0030] To ensure safety, the pressure of the input compressed air and the output natural gas pressure must be controlled. The present invention integrates a pressure feedback control system in the tail cover. The natural gas inlet 48 is connected to the air outlet of the compression cylinder, and the compressed air inlet 45 is connected to the vehicle-mounted high-pressure air. When the compressed air pressure is higher than the set minimum pressure, the compressed air pushes the No. 1 stop valve core 43 to the left, and the compressed air can pass through the No. 1 stop valve core 43. When the natural gas pressure is lower than the set pressure, the spring force is greater than the pressure of the natural gas on the sealing isolation piston 47, and the No. 2 stop valve core 44 moves right and the compressed air can pass. When the natural gas pressure is greater than the set value, the spring force is less than the thrust of the natural gas on the sealing isolation piston 47, and the sealing isolation piston 47 pushes the No. 2 stop valve core 44 to the left, and the compressed air passage is cut off. When the compressed air pressure is lower than the set value, the spring force is greater than the thrust of the compressed air on the stop valve core, and the compressed air cannot push open the No. 1 stop valve core 43, and the compressed air is cut off. The compression pump stops working. That is, when the compressed air pressure is higher than the set pressure and the natural gas pressure is lower than the set pressure, the compressed air is conducted and the booster pump starts working. When one of the above conditions is not met, the booster pump stops working.

[0031] like Figure 3 As shown, the compression cylinder tail cover 5 includes a ventilation function plate 51, a variable diameter coil spring 52, a one-way valve core 53, a natural gas one-way air inlet 54, a natural gas one-way air outlet 55 and a compression cylinder tail seat 56; the ventilation function plate 51 is arranged at the upper end of the compression cylinder tail seat 56; two pipes 57 are arranged inside the compression cylinder tail seat 56, and one end of the pipe 57 is arranged on the upper side of the compression cylinder tail seat 56, and the other end is arranged on the inner side of the compression cylinder tail seat 56; the variable diameter coil springs 52 are arranged inside the upper ends of the two pipes 57 respectively; the one-way valve core 53 is arranged in the pipe 57 at the bottom end of the variable diameter coil spring 52; the natural gas one-way air inlet 54 and the natural gas one-way air outlet 55 are arranged at the ends of the two pipes 57 respectively.

[0032] A one-way natural gas inlet / outlet is provided in the compression chamber 32, and the one-way valve is integrated in the compression cylinder tail cover to save space. Under the push of positive pressure, the one-way valve core 53 compresses the variable diameter coil spring 52 to move, and the valve opens. Under the push of reverse pressure, the one-way valve core 53 presses the vent, and the valve closes.

[0033] like Figure 4As shown, the driving compression device 3 includes a driving chamber 31, a compression chamber 32, a driving piston 37, a compression piston 38 and a push rod 39; the compression piston 38 is arranged in the inner longitudinal direction of the compression chamber 32, and the compression chamber 32 on the left side of the compression piston 38 is the first compression chamber 35, and the right side is the second compression chamber 36; natural gas one-way air inlets 7 are arranged at the middle and upper ends of both sides of the compression chamber 32; natural gas one-way air outlets 8 are arranged at the middle and lower ends of both sides of the compression chamber 32; the driving piston 37 is arranged in the inner longitudinal direction of the driving chamber 31; the driving chamber 31 on the left side of the driving piston 37 is the first driving chamber 33, and the right side is the second driving chamber 34; compressed air two-way air ports 9 are arranged at the middle and upper ends of both sides of the driving chamber 31; the driving piston 37 and the compression piston 38 are connected by push rods 39

[0034] like Figure 5 As shown, the driving compression device 3 includes a compression chamber 32, a No. 1 driving chamber 33, a No. 2 driving chamber 34 and a movable piston 10; movable pistons 10 are respectively arranged in the longitudinal direction on both sides of the interior of the driving compression device 3; the cavity between the two movable pistons 10 is the compression chamber 32; the left cavity of the left movable piston 10 is the No. 1 driving chamber 33; the cavity of the right movable piston 10 is the No. 2 driving chamber 34; compressed air bidirectional air ports 9 are respectively arranged on both sides of the driving compression device 3; and natural gas one-way inlets 7 and natural gas one-way outlets 8 are respectively arranged on both sides of the bottom end of the compression chamber 32.

[0035] like Figure 6 As shown, the driving compression device 3 includes a compression chamber 32, a compression piston 38, a push rod 39 and a motor-driven reciprocating mechanism 11; the compression piston 38 is arranged in the inner longitudinal direction of the driving chamber 32, and the compression chamber 32 on the left side of the compression piston 38 is the first compression chamber 35, and the right side is the second compression chamber 36; natural gas one-way air inlets 7 are arranged at the middle and upper ends of both sides of the compression chamber 32; natural gas one-way air outlets 8 are respectively arranged at the middle and lower ends of both sides of the compression chamber; the motor-driven reciprocating mechanism 11 is arranged on the right side of the compression chamber 32, and the compression piston 38 is connected to the motor-driven reciprocating mechanism 11 through a push rod 39.

[0036] When in use, the vehicle-mounted compressed air, under the control of the driving reversing device, alternately enters or discharges the driving chamber, pushes the driving piston, and at the same time drives the compression piston to compress and increase the pressure of the gas in the compression chamber. The action process is as follows: the No. 1 driving chamber 33 enters the compressed air, and the No. 2 driving chamber 34 exhausts the air. At this time, the driving piston 37 moves to the right, and the natural gas in the No. 1 compression chamber 35 is compressed. When the compression piston 38 moves to the right to the limit position, the driving piston 37 touches the No. 2 push rod 24, and the No. 2 push rod 24 pushes the reversing shaft 27 to move to the right, and the state of the air inlet changes to the No. 1 driving two-way air port 23 exhausting and the No. 2 driving two-way air port 26 intake. The driving piston 37 starts to move to the left, and the natural gas in the No. 2 compression chamber 36 is compressed. When the compression piston 38 moves to the left to the limit position, it touches the No. 1 push rod 22, and the air inlet state changes again, and this cycle repeats. The No. 1 compression chamber 35 and the No. 2 compression chamber 36 are respectively provided with a one-way air inlet and a one-way air outlet.

[0037] Assume that the compressed air pressure is P1, the original natural gas pressure is P2, and the compressed natural gas pressure is P3. The drive chamber cylinder diameter section is S drive, the compression cylinder diameter section is S pressure, and without considering the friction resistance and the exhaust back pressure of the drive chamber, and ignoring the piston connection shaft section, there is the following theoretical formula:

[0038] P3S pressure = P1S drive + P2S pressure

[0039] The present invention only needs a compressed gas source as power input, has no electronic equipment, and is safer when used in LNG gas supply systems. The piston movement is controlled by a drive reversing device. Figure 1 In the state, the No. 1 drive chamber 33 is inlet, and the No. 2 drive chamber 34 is exhausted. At this time, the compression piston 38 will move rightward (i.e., move from the No. 1 drive chamber 33 to the No. 2 drive chamber 34) under the push of the compressed air. When the drive piston 37 moves rightward to the limit position, it will touch the No. 2 push rod 24, drive the reversing shaft 27 to move rightward, and the state of the air inlet will change to the No. 2 drive chamber 34 inlet, the No. 1 drive chamber 33 exhaust, and the piston moves in the same direction, and so on.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A booster pump for an air supply device, characterized in that: include: A pump body, a driving reversing device, a driving compression device, a driving cylinder tail cover, a compression cylinder tail cover and a partition; a driving reversing device is arranged on the left side of the upper end of the pump body; a driving compression device is arranged inside the pump body, and the driving compression device and the driving reversing device are used in coordination; the partition is arranged in the longitudinal middle of the driving compression device; the driving cylinder tail cover is arranged on the left side of the pump body; the compression cylinder tail cover is arranged on the right side of the pump body; the driving cylinder tail cover and the compression cylinder tail cover are both coordinated with the driving compression device; The driving reversing device comprises a No. 1 connecting rod, a No. 1 push rod, a No. 1 driving two-way air port, a No. 2 push rod, a No. 2 connecting rod, a No. 2 driving two-way air port and a reversing shaft; the No. 1 connecting rod is arranged at the left bottom end of the driving reversing device, and the No. 1 connecting rod extends into the tail cover of the driving cylinder; a No. 1 driving two-way air port is opened on the tail cover of the driving cylinder on the right side of the No. 1 connecting rod; a No. 1 push rod is arranged at the bottom end of the No. 1 connecting rod and the No. 1 driving two-way air port, and the No. 1 push rod passes through the tail cover of the driving cylinder and cooperates with the driving compression device; a No. 2 connecting rod is arranged at the right bottom end of the driving reversing device, and the bottom end of the No. 2 connecting rod extends into the partition; a No. 2 driving two-way air port is opened on the partition on the right side of the No. 2 connecting rod; a No. 2 push rod is arranged at the bottom end of the No. 2 connecting rod and the No. 2 driving two-way air port, and the No. 2 push rod passes through the partition and cooperates with the driving compression device; a reversing shaft is arranged in the driving reversing device outside the No. 2 connecting rod, and the No. 2 connecting rod and the reversing shaft are used in coordination; The driving compression device comprises a driving chamber, a driving piston, a compression chamber, a compression piston and a push rod; the driving chamber comprises a No. 1 driving chamber and a No. 2 driving chamber; the compression chamber comprises a No. 1 compression chamber and a No. 2 compression chamber; a driving chamber is arranged on the left side of the partition; and a compression chamber is arranged on the right side of the partition; The drive cylinder tail cover includes a compressed air pressure regulating knob, a natural gas pressure regulating knob, a compressed air inlet, a natural gas inlet, a sealing isolation piston, a No. 1 stop valve core, a No. 2 stop valve core and a compressed air outlet; A No. 1 stop valve core and a No. 2 stop valve core are respectively arranged inside the tail cover of the driving cylinder; a compressed air pressure regulating knob is arranged on the left side of the No. 1 stop valve core, and a compressed air inlet is arranged on the right side; a compressed air outlet is arranged at the bottom end of the tail cover of the driving cylinder, and the compressed air outlet is connected with the No. 1 stop valve core through a pipeline; a natural gas pressure regulating knob is arranged on the left side of the No. 2 stop valve core, and a natural gas feed port is arranged on the right side; a sealing isolation piston is arranged in the left pipeline of the natural gas inlet; The compression cylinder tail cover includes a ventilation function plate, a variable diameter coil spring, a one-way valve core, a natural gas one-way air inlet, a natural gas one-way air outlet and a compression cylinder tail seat; a ventilation function plate is arranged at the upper end of the compression cylinder tail seat; two pipes are arranged inside the compression cylinder tail seat, and one end of the pipe is arranged on the upper side of the compression cylinder tail seat, and the other end is arranged on the inner side of the compression cylinder tail seat; variable diameter coil springs are arranged inside the upper ends of the two pipes respectively; a one-way valve core is arranged in the pipe at the bottom end of the variable diameter coil spring; a natural gas one-way air inlet and a natural gas one-way air outlet are arranged at the ends of the two pipes respectively.

2. A booster pump for an air supply device according to claim 1, characterized in that: A driving piston is arranged in the inner longitudinal direction of the driving chamber; a compression piston is arranged in the inner longitudinal direction of the compression chamber; a push rod is arranged in the middle of the right side of the driving piston, and the push rod extends to the right through the partition and is fixed in the middle of the compression piston; the left driving chamber of the driving piston is the No. 1 driving chamber, and the right side is the No. 2 driving chamber; the left compression chamber of the compression piston is the No. 2 compression chamber, and the right side is the No. 1 compression chamber; the No. 1 driving two-way air port cooperates with the No. 1 driving chamber, and the No. 2 driving two-way air port cooperates with the No. 2 driving chamber; the No. 1 compression chamber one-way air inlet valve and the No. 1 compression chamber one-way air outlet valve are respectively arranged on the right side of the No. 1 compression chamber; the No. 2 compression chamber one-way air inlet valve and the No. 2 compression chamber one-way air outlet valve are respectively arranged on the left side of the No. 2 compression chamber.

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