Hydraulic drive hydrogen compressor based on electric servo EHA system control

Abstract

The invention discloses a hydraulic drive hydrogen compressor based on electric servo EHA system control, and relates to the technical field of the electric servo EHA system control drive mode of an upper supercharger of the hydraulic drive hydrogen compressor, the compressor comprises a hydraulic mechanism and a pressurization mechanism, and internal oil flows into the hydraulic mechanism according to the requirement of the pressurization mechanism. An explosion-proof servo motor drives a servo pump to build pressure of oil liquid, the pressure of the oil liquid is maintained through a functional mechanism, then the oil liquid is cooled and filtered through a filtering mechanism, finally, the oil liquid is conveyed to a pressurizing mechanism and runs on one side of the pressurizing mechanism, hydrogen enters through air inlets of the superchargers, the two superchargers are driven by a hydraulic mechanism, the entering hydrogen is compressed, and the pressure of the oil liquid is increased. And discharging from the exhaust port.

Description

Technical Field

[0001] The invention relates to the technical field of a liquid-driven hydrogen compressor having an upper supercharger driving mode controlled by an electric servo EHA system, and in particular to a liquid-driven hydrogen compressor controlled by an electric servo EHA system. Background Art

[0002] At present, there are many common problems with the entire liquid-driven hydrogen compressor. When the liquid-driven supercharger is switched, the response time is long; when the liquid-driven supercharger is switched, the impact is large, the operation is unstable, and it is easy to collide with the end covers on both sides, and the operating speed of the supercharger cannot be controlled. The supercharger equipment has extremely high energy consumption, resulting in high energy consumption of hydrogen refueling station equipment, and even peak operation can only be achieved by staggered opening of the liquid-driven supercharger. The entire hydrogenation cost remains high, hydrogen refueling stations suffer huge losses, and even close down, and the marketization of hydrogen energy is slow.

[0003] These problems bring many safety hazards. The hydrogen gas flow is unstable and prone to heating up, which can hit the end covers on both sides, easily causing hydrogen seal leakage, connecting shaft breakage, and even explosion accidents. The high energy consumption leads to extremely high costs for back-end users, which is not conducive to the marketization and promotion of the product. Summary of the invention

[0004] The object of the present invention is to provide a liquid-driven hydrogen compressor controlled by an electric servo EHA system to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The supercharger comprises a hydraulic mechanism, a supercharging mechanism and a chassis, wherein the hydraulic mechanism and the supercharging mechanism are fixedly connected, and the supercharging mechanism and the chassis are fixedly connected;

[0007] The hydraulic mechanism comprises a servo pump, a functional mechanism, a filtering mechanism, an accumulator and a solenoid valve. The servo pump and the functional mechanism are fixedly connected, the functional mechanism and the filtering mechanism are fixedly connected, the accumulator and the functional mechanism are fixedly connected, and the solenoid valve and the filtering mechanism are fixedly connected.

[0008] Through the hydraulic mechanism, the internal oil is pressurized and maintained according to the needs of the booster mechanism, and then cooled and filtered. Finally, the oil enters the booster mechanism and runs on one side of the booster mechanism. The explosion-proof servo motor drives the servo pump to work according to the needs of the booster mechanism. The internal oil is pressurized by the servo pump, and the pressurized oil enters the functional mechanism. The functional mechanism maintains the pressure of the pressurized oil to reduce pressure fluctuations, ensure the accuracy of the booster, keep the oil in a suitable hydraulic range, and reduce damage to the equipment caused by pressure fluctuations. When the functional mechanism is working and the oil is insufficient, the accumulator is used to replenish the functional mechanism to provide power for the functional mechanism so that the functional mechanism can continue to work. The oil after pressure maintenance enters the filtering mechanism, and the oil passing through is filtered by the filtering mechanism. The cooling water enters the filtering mechanism through the solenoid valve, so that the oil is cooled while filtering. The solenoid valve automatically adjusts the switch of the valve according to changes in temperature and water consumption to achieve fully automated management of the equipment.

[0009] Furthermore, the functional mechanism includes a control block No. 1, a one-way valve No. 1, a relief valve No. 1, a one-way valve No. 2, a relief valve No. 2 and a monitoring unit, the control block No. 1 is provided with a liquid channel No. 1, the one-way valve No. 1 is fixedly connected to the liquid channel No. 1, the servo pump output port is connected to the liquid channel No. 1, the relief valve No. 1 is fixedly connected to the liquid channel No. 1, the control block No. 1 is provided with a liquid channel No. 2, the liquid channel No. 2 is connected to the accumulator pipeline, the return port of the relief valve No. 1 is connected to the liquid channel No. 2, the control block No. 1 is provided with a liquid channel No. 3, the servo pump input port is connected to the liquid channel No. 3, the one-way valve No. 2 is fixedly connected to the liquid channel No. 3, the relief valve No. 2 is fixedly connected to the liquid channel No. 3, the return port of the relief valve No. 2 is connected to the liquid channel No. 2, the monitoring unit is fixedly connected to the control block No. 1, the liquid channel No. 1 is connected to the liquid channel No. 2 pipeline, and the liquid channel No. 3 is connected to the liquid channel No. 2 pipeline.

[0010] The No. 1 liquid channel provided in the No. 1 control block is connected to the output port of the servo pump, so that the oil of the servo pump flows into the No. 1 liquid channel. By installing the No. 1 check valve, the oil flows in one direction in the No. 1 liquid channel. By using the No. 1 overflow valve, the pressure of the No. 1 liquid channel will not be too large, and the excess oil is discharged back to the No. 2 liquid channel through the reflux port. The No. 1 liquid channel and the No. 2 liquid channel are connected through pipelines, and a check valve is installed in the connected pipeline to discharge the excess oil back to the No. 1 liquid channel to keep the pressure stable. The No. 3 liquid channel provided in the No. 1 control block is connected to the input port of the servo pump, so that the oil in the No. 3 liquid channel flows into the servo pump. By installing the No. 2 check valve, the oil in the No. 3 liquid channel is One-way flow occurs in the liquid channel through the No. 2 relief valve, so that the pressure in the No. 3 liquid channel will not be too high, and the excess oil will be discharged back to the No. 2 liquid channel through the reflux port to keep the pressure stable. The No. 3 liquid channel and the No. 2 liquid channel are connected through pipelines, and a one-way valve is installed in the connected pipeline to allow the excess oil to be discharged back to the No. 3 liquid channel. The No. 2 liquid channel and the accumulator pipeline are connected so that part of the oil enters the accumulator for storage for emergency oil replenishment. The pressure changes in the No. 1 liquid channel, the No. 2 liquid channel and the No. 3 liquid channel are monitored in real time through the monitoring unit to ensure stable operation of the system. The one-way valve and the relief valve are both external structures, which can be directly plugged in or screwed disassembled and assembled for easy repair and maintenance.

[0011] Furthermore, the monitoring unit includes a No. 1 pressure gauge, a No. 1 explosion-proof pressure transmitter, a No. 2 pressure gauge, a No. 2 explosion-proof pressure transmitter, a No. 3 pressure gauge, a No. 3 explosion-proof pressure transmitter and an explosion-proof temperature transmitter, a No. 1 control block is provided with a No. 4 liquid channel, the No. 1 pressure gauge is fixedly connected to the No. 1 control block, a measuring end of the No. 1 pressure gauge is placed in the No. 4 liquid channel, the No. 1 explosion-proof pressure transmitter is fixedly connected to the No. 1 control block, a sensing end of the No. 1 explosion-proof pressure transmitter is placed in the No. 4 liquid channel, the No. 4 liquid channel is connected to the No. 1 liquid channel, the No. 1 control block is provided with a No. 5 liquid channel, and the No. 2 The No. 1 pressure gauge is fixedly connected to the No. 1 control block, the measuring end of the No. 2 pressure gauge is placed in the No. 5 liquid channel, the No. 2 explosion-proof pressure transmitter is fixedly connected to the No. 1 control block, the sensing end of the No. 2 explosion-proof pressure transmitter is placed in the No. 5 liquid channel, the No. 3 pressure gauge is fixedly connected to the No. 1 control block, the measuring end of the No. 3 pressure gauge is placed in the No. 2 liquid channel, the No. 3 explosion-proof pressure transmitter is fixedly connected to the No. 1 control block, the sensing end of the No. 3 explosion-proof pressure transmitter is placed in the No. 2 liquid channel, the explosion-proof temperature transmitter is fixedly connected to the No. 1 control block, and the sensing end of the explosion-proof temperature transmitter is placed in the No. 2 liquid channel.

[0012] A No. 4 liquid channel is set through the No. 1 control block, and the measuring end of the No. 1 pressure gauge is placed in the No. 4 liquid channel, the sensing end of the No. 1 explosion-proof pressure transmitter is placed in the No. 4 liquid channel, and the No. 4 liquid channel is connected with the No. 1 liquid channel to monitor the pressure change of the No. 1 liquid channel in real time, and the pressure data is recorded by the No. 1 explosion-proof pressure transmitter. The No. 1 pressure gauge is used as an auxiliary judgment tool to help operators quickly understand the pressure change trend of the hydraulic system. A No. 5 liquid channel is set through the No. 1 control block, and the measuring end of the No. 2 pressure gauge is placed in the No. 5 liquid channel, the sensing end of the No. 2 explosion-proof pressure transmitter is placed in the No. 5 liquid channel, and the No. 5 liquid channel is connected with the No. 3 liquid channel to monitor the pressure change of the No. 3 liquid channel in real time, and the pressure data is recorded by the No. 2 explosion-proof pressure transmitter. The No. 2 pressure gauge is used as an auxiliary judgment tool. An auxiliary judgment tool helps operators quickly understand the pressure change trend of the hydraulic system. A No. 2 liquid channel is set through the No. 1 control block, and the measuring end of the No. 3 pressure gauge is placed in the No. 2 liquid channel, the sensing end of the No. 3 explosion-proof pressure transmitter is placed in the No. 2 liquid channel, and the sensing end of the temperature pressure transmitter is placed in the No. 2 liquid channel to monitor the pressure and temperature changes of the No. 2 liquid channel in real time. The No. 3 pressure gauge is used as an auxiliary judgment tool to help operators quickly understand the pressure change trend of the hydraulic system. The signals of the No. 1 explosion-proof pressure transmitter, the No. 2 explosion-proof pressure transmitter and the No. 3 explosion-proof pressure transmitter are used to control the servo pump and the accumulator, and then the pressure of the No. 1 liquid channel, the No. 2 liquid channel and the No. 3 liquid channel are controlled. The explosion-proof pressure transmitter and the pressure gauge are both external structures and can be directly plugged in or screwed and disassembled for easy repair and maintenance.

[0013] Furthermore, the filtering mechanism includes control block No. 2, one-way valve No. 3, filter No. 1, one-way valve No. 4, filter No. 2 and a fixed bracket, control block No. 2 is fixedly connected to control block No. 1, control block No. 2 is provided with liquid channel No. 6, liquid channel No. 6 is connected to liquid channel No. 1, four one-way valves No. 3 are provided, and the one-way valve No. 3 is placed in liquid channel No. 6, filter No. 1 is fixedly connected to control block No. 2, the filtering end of filter No. 1 is placed in liquid channel No. 6, control block No. 2 is provided with liquid channel No. 7, liquid channel No. 7 is connected to liquid channel No. 3, four one-way valves No. 4 are provided, and the one-way valve No. 4 is placed in liquid channel No. 7, filter No. 2 is fixedly connected to control block No. 2, the filtering end of filter No. 2 is placed in liquid channel No. 7, control block No. 2 is provided with a cooling trough, the cooling trough is provided with a water inlet, the cooling trough is provided with a water outlet, and the solenoid valve is fixedly connected to the water inlet.

[0014] The No. 2 control block is fixed by a fixing bracket to provide a stable working environment. A No. 6 liquid channel is provided through the No. 2 control block, and the No. 6 liquid channel is connected with the No. 1 liquid channel, so that the oil can flow from the No. 1 liquid channel to the No. 6 liquid channel. Four No. 3 one-way valves and a No. 1 filter are installed in the No. 6 liquid channel to form a loop, so that the oil passes through the No. 3 one-way valve, passes through the filtering end of the No. 1 filter, is filtered, and finally flows into the booster mechanism. A No. 7 liquid channel is provided through the No. 2 control block, and the oil passing through the booster mechanism flows to the No. 7 liquid channel. Four No. 4 one-way valves are installed in the No. 7 liquid channel. The check valve and the No. 2 filter form a loop, so that the oil passes through the No. 4 check valve and then passes through the filtering end of the No. 2 filter for filtering, and is connected through the No. 7 liquid channel and the No. 3 liquid channel, and finally the oil can flow from the No. 7 liquid channel to the No. 3 liquid channel, and the cooling water enters the cooling groove through the provided water inlet. The cooling grooves are evenly distributed inside the No. 2 control block. The cooling water passes through the cooling groove, so that the cooling water absorbs the heat of the No. 2 control block, and absorbs the heat of the oil through the effect of heat transfer, and finally flows out from the water outlet, so that the cooling water cools the oil, and cooling and filtering can be carried out at the same time, thereby improving the efficiency of the supercharger.

[0015] Furthermore, the boosting mechanism includes a supercharger, a proximity switch, a No. 4 explosion-proof pressure transmitter, a No. 5 explosion-proof pressure transmitter and a fixed plate, the supercharger and the proximity switch are fixedly connected, the proximity switch and the No. 2 control block are fixedly connected, the No. 4 explosion-proof pressure transmitter is placed outside the supercharger, the No. 5 explosion-proof pressure transmitter is placed outside the supercharger, two fixed plates are provided, the fixed plate and the supercharger are fixedly connected, and the fixed plate and the base frame are fixedly connected.

[0016] The oil is filtered and cooled and enters the proximity switch for single-side operation, driving the supercharger 21 to compress the hydrogen. Two superchargers are provided, one for intake and the other for exhaust. The supercharger and the proximity switch are fixedly connected, and the supercharger is controlled by the proximity switch to compress the hydrogen. The proximity switch is inserted into the appropriate depth to protect the supercharger. The No. 4 explosion-proof pressure transmitter is installed at the intake end outside the supercharger to monitor the hydrogen intake pressure in real time. The No. 5 explosion-proof pressure transmitter is installed at the exhaust end outside the supercharger to monitor the hydrogen exhaust pressure in real time. Combined with the accumulation of previous data of the No. 2 explosion-proof pressure transmitter and the No. 3 explosion-proof pressure transmitter, the appropriate pressure is output as needed through the control calculation simulation formula and calculation algorithm.

[0017] Furthermore, the proximity switch includes a No. 1 shell, a No. 1 piston and a piston rod. The No. 1 shell is provided with a No. 1 active chamber. The No. 1 piston is placed in the No. 1 active chamber. The piston rod is fixedly connected to the No. 1 piston. The piston is fixedly connected to the No. 1 supercharger. The No. 1 shell is fixedly connected to the No. 1 supercharger. The piston rod is fixedly connected to the No. 2 supercharger. The No. 1 shell is fixedly connected to the No. 2 supercharger. The No. 1 active chamber is connected to the No. 6 liquid channel pipeline, and the No. 1 active chamber is connected to the No. 7 liquid channel pipeline.

[0018] A movable chamber No. 1 is provided through the No. 1 housing so that the No. 1 piston can only move therein. It is connected to the supercharger through a piston rod. The piston rod is inserted to a suitable depth to protect the end covers on both sides of the supercharger. The No. 1 movable chamber is connected to the No. 6 liquid channel pipeline so that the oil enters one side of the No. 1 movable chamber. Through the forward and reverse operation of the servo pump, the No. 1 movable chamber is connected to the No. 7 liquid channel pipeline so that the oil flows from the other side of the No. 1 movable chamber into the No. 7 liquid channel, thereby causing the oil to push the No. 1 piston to move back and forth.

[0019] Furthermore, the supercharger includes a No. 2 shell, a No. 2 piston and an end cover, the No. 2 shell is fixedly connected to the No. 1 shell, the No. 2 shell is provided with a No. 2 movable chamber, the No. 2 piston is placed in the No. 2 movable chamber, the No. 2 piston is fixedly connected to the piston rod, and the end cover is fixedly connected to the No. 2 shell.

[0020] The No. 2 outer shell is provided with a No. 2 movable chamber. By fixing the No. 2 piston and the piston rod placed in the No. 2 movable chamber, the No. 2 piston can move back and forth with the No. 1 piston to compress the incoming hydrogen. By inserting the piston rod into the No. 2 movable chamber to a suitable depth, the No. 2 piston can be prevented from hitting the end covers on both sides of the supercharger during operation, thereby protecting the supercharger.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The servo pump is driven by an explosion-proof servo motor, so that the oil flows from the servo pump to the functional mechanism for pressure maintenance, and then enters the filtering mechanism to cool and filter the oil, and finally enters the boost mechanism for operation. Through multi-stage mode control and combined with proximity switches, triple protection is achieved, which completely solves the problem of the piston inside the supercharger colliding with the end covers on both sides, and the system control accuracy is within 0.01~0.001mm.

[0023] 2. Through the explosion-proof pressure transmitter, the output mode and output volume of the servo pump can be automatically and flexibly adjusted according to the different pressures at the intake and exhaust ends, as well as user needs. This can be adapted to local conditions, eliminate unnecessary waste, and improve energy utilization. Therefore, the operating cost of the hydrogen refueling station is greatly reduced.

[0024] 3. By installing the filter mechanism on the upper part of the boost mechanism, the floor space is reduced. By installing a one-way valve and a filter inside the No. 2 control block, the number of single components is reduced, cost is saved, and maintenance is facilitated.

[0025] 4. By adopting direct connection or short pipe connection, the overall footprint of the liquid-driven supercharger is greatly reduced.

[0026] 5. All components such as the overflow valve, one-way valve, pressure gauge and filter are directly plugged in or screwed for easy repair and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 yes Figure 1 A magnified view of a local area A;

[0029] Figure 3 This is a schematic diagram of the connection of the servo pump input terminal of the present invention;

[0030] Figure 4 This is a schematic diagram of the connection between the fourth liquid channel and the first liquid channel of the present invention;

[0031] Figure 5 It is a schematic diagram of the connection between the fifth liquid channel and the third liquid channel of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the second liquid channel of the present invention;

[0033] Figure 7 It is a schematic diagram of the connection between the No. 1 liquid channel and the No. 6 liquid channel of the present invention;

[0034] Figure 8 It is a schematic diagram of the connection between the No. 3 liquid channel and the No. 7 liquid channel of the present invention;

[0035] Fig. 9 It is a schematic diagram of the positions of the No. 3 check valve and the No. 4 check valve of the present invention;

[0036] Fig.10 It is a schematic diagram of the structure of the boosting mechanism of the present invention;

[0037] Fig.11 yes Fig.10 A magnified view of a local area B.

[0038] In the figure: 1, hydraulic mechanism; 11, servo pump; 111, output port; 112, input port; 12, functional mechanism; 121, control block No. 1; 1211, liquid channel No. 1; 1212, liquid channel No. 2; 1213, liquid channel No. 3; 1214, liquid channel No. 4; 1215, liquid channel No. 5; 122, check valve No. 1; 123, overflow valve No. 1; 124, check valve No. 2; 125, overflow valve No. 2; 126, monitoring unit; 1261, pressure gauge No. 1; 1262, explosion-proof pressure transmitter No. 1; 1263, pressure gauge No. 2; 1264, explosion-proof pressure transmitter No. 2; 1265, pressure gauge No. 3; 1266, explosion-proof pressure transmitter No. 3; 1267, explosion-proof Explosion-proof temperature transmitter; 13. Filter mechanism; 131. No. 2 control block; 1311. No. 6 liquid channel; 1312. No. 7 liquid channel; 132. No. 3 check valve; 133. No. 1 filter; 134. No. 4 check valve; 135. No. 2 filter; 136. Fixed bracket; 14. Accumulator; 15. Solenoid valve; 2. Pressurizing mechanism; 21. Supercharger; 211. No. 2 shell; 2111. No. 2 movable chamber; 212. No. 2 piston; 213. End cover; 22. Proximity switch; 221. No. 1 shell; 2211. No. 1 movable chamber; 222. No. 1 piston; 223. Piston rod; 23. No. 4 explosion-proof pressure transmitter; 24. No. 5 explosion-proof pressure transmitter; 25. Fixed plate; 3. Base frame. DETAILED DESCRIPTION

[0039] 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.

[0040] Example: Figure 1-Figure 11 As shown, the present invention provides a technical solution for controlling a liquid-driven hydrogen compressor based on an electric servo EHA system, a supercharger based on an electric servo EHA system, comprising a hydraulic mechanism 1, a supercharging mechanism 2 and a chassis 3, wherein the hydraulic mechanism 1 and the supercharging mechanism 2 are fixedly connected, and the supercharging mechanism 2 and the chassis 3 are fixedly connected;

[0041] The hydraulic mechanism 1 includes a servo pump 11, a functional mechanism 12, a filtering mechanism 13, an accumulator 14 and a solenoid valve 15. The servo pump 11 and the functional mechanism 12 are fixedly connected, the functional mechanism 12 and the filtering mechanism 13 are fixedly connected, the accumulator 14 and the functional mechanism 12 are fixedly connected, and the solenoid valve 15 and the filtering mechanism 13 are fixedly connected.

[0042] Through the hydraulic mechanism 1, the internal oil is pressurized and maintained according to the requirements of the booster mechanism 2, and then cooled and filtered. Finally, the oil enters the booster mechanism 2 and runs on one side of the booster mechanism 2. The explosion-proof servo motor drives the servo pump 11 to work according to the requirements of the booster mechanism 2. The internal oil is pressurized by the servo pump 11, and the pressurized oil enters the functional mechanism 12. The functional mechanism 12 maintains the pressure of the pressurized oil, reduces the pressure fluctuation, ensures the accuracy of the booster, keeps the oil in the appropriate hydraulic range, and reduces the pressure fluctuation caused by the pressure fluctuation. In order to prevent damage to the equipment caused by the movement of the functional mechanism 12, when the functional mechanism 12 is running low on oil, the accumulator 14 is used to replenish the functional mechanism 12 with oil to provide power for the functional mechanism 12 so that the functional mechanism 12 can continue to work. The oil after maintaining pressure enters the filter mechanism 13, and the oil passing through the filter mechanism 13 is filtered. The cooling water enters the filter mechanism 13 through the solenoid valve 15, so that the oil is cooled while being filtered. The solenoid valve 15 is used to automatically adjust the valve switch according to the changes in temperature and water consumption, thereby realizing fully automated management of the oil cooling of the equipment.

[0043] like Figure 3 to Figure 8 As shown, the functional mechanism 12 includes a control block No. 121, a one-way valve No. 122, a relief valve No. 123, a one-way valve No. 24, a relief valve No. 25 and a monitoring unit 126. The control block No. 121 is provided with a liquid channel No. 1211, the one-way valve No. 122 is fixedly connected to the liquid channel No. 1211, the output port 111 of the servo pump 11 is connected to the liquid channel No. 1211, the relief valve No. 123 is fixedly connected to the liquid channel No. 1211, the control block No. 121 is provided with a liquid channel No. 212, the liquid channel No. 212 is connected to the pipeline of the accumulator 14 ... one-way valve No. 123 is fixedly connected to the liquid channel No. 1211, the one-way valve No. 124 is fixedly connected to the liquid channel No. 1211, the one-way valve No. 125 is fixedly connected to the liquid channel No. 1211, the one-way valve No. 124 is fixedly connected to the liquid channel No. 1211, the one-way valve No. 124 is fixedly connected to the liquid channel No. 1211, the one-way valve No. 124 is fixedly connected to the liquid channel No. 1211, the one-way valve No. 124 is fixedly connected to the liquid channel No. 1211, the one-way valve No. 124 is fixedly connected to the liquid channel No. 1211, the one- The reflux port is connected to the No. 2 liquid channel 1212, the No. 1 control block 121 is provided with a No. 3 liquid channel 1213, the input port 112 of the servo pump 11 is connected to the No. 3 liquid channel 1213, the No. 2 one-way valve 124 is fixedly connected to the No. 3 liquid channel 1213, the No. 2 overflow valve 125 is fixedly connected to the No. 3 liquid channel 1213, the reflux port of the No. 2 overflow valve 125 is connected to the No. 2 liquid channel 1212, the monitoring unit 126 is fixedly connected to the No. 1 control block 121, the No. 1 liquid channel 1211 is connected to the No. 2 liquid channel 1212 by pipeline, and the No. 3 liquid channel 1213 is connected to the No. 2 liquid channel 1212 by pipeline.

[0044] The No. 1 liquid channel 1211 provided in the No. 1 control block 121 is connected with the output port 111 of the servo pump 11, so that the oil of the servo pump 11 flows into the No. 1 liquid channel 1211, and the No. 1 one-way valve 122 is installed to make the oil flow in the No. 1 liquid channel 1211 in one direction, and the No. 1 overflow valve 123 is used to prevent the pressure of the No. 1 liquid channel 1211 from being too large, and the excess oil is discharged back to the No. 2 liquid channel 1212 through the reflux port, and the No. 1 liquid channel 1211 and the No. 2 liquid channel 1212 are connected through pipelines, and a one-way valve is installed in the connected pipeline, so that the excess oil is discharged back to the No. 1 liquid channel 1211 to keep the pressure stable, and the No. 3 liquid channel 1213 provided in the No. 1 control block 121 is connected with the input port 112 of the servo pump 11, so that the oil in the No. 3 liquid channel 1213 flows into the servo pump 11, and the No. 2 one-way valve 12 4, so that the oil flows in the No. 3 liquid channel 1213 in one direction, through the No. 2 relief valve 125, the pressure of the No. 3 liquid channel 1213 will not be too large, and the excess oil is discharged back to the No. 2 liquid channel 1212 through the reflux port to keep the pressure stable, the No. 3 liquid channel 1213 and the No. 2 liquid channel 1212 are connected through the pipeline, and a one-way valve is installed in the connected pipeline to allow the excess oil to be discharged back to the No. 3 liquid channel 1213, and the No. 2 liquid channel 1212 is connected to the accumulator 14 through the pipeline, so that part of the oil enters the accumulator 14 for storage for emergency oil replenishment, and the pressure changes of the No. 1 liquid channel 1211, the No. 2 liquid channel 1212 and the No. 3 liquid channel 1213 are monitored in real time through the monitoring unit 126 to ensure the stable operation of the system, and the one-way valve and the relief valve are both external structures, which can be directly plugged in or screwed and disassembled, which is convenient for repair and maintenance.

[0045] like Figures 4 to 8As shown, the monitoring unit 126 includes a No. 1 pressure gauge 1261, a No. 1 explosion-proof pressure transmitter 1262, a No. 2 pressure gauge 1263, a No. 2 explosion-proof pressure transmitter 1264, a No. 3 pressure gauge 1265, a No. 3 explosion-proof pressure transmitter 1266 and an explosion-proof temperature transmitter 1267, the No. 1 control block 121 is provided with a No. 4 liquid channel 1214, the No. 1 pressure gauge 1261 is fixedly connected to the No. 1 control block 121, the measuring end of the No. 1 pressure gauge 1261 is placed in the No. 4 liquid channel 1214, the No. 1 explosion-proof pressure transmitter 1262 is fixedly connected to the No. 1 control block 121, the sensing end of the No. 1 explosion-proof pressure transmitter 1262 is placed in the No. 4 liquid channel 1214, the No. 4 liquid channel 1214 is connected to the No. 1 liquid channel 1211, and the No. 1 control block 121 is provided with a No. 5 liquid channel 121 5. The No. 2 pressure gauge 1263 is fixedly connected to the No. 1 control block 121, and the measuring end of the No. 2 pressure gauge 1263 is placed in the No. 5 liquid channel 1215. The No. 2 explosion-proof pressure transmitter 1264 is fixedly connected to the No. 1 control block 121, and the sensing end of the No. 2 explosion-proof pressure transmitter 1264 is placed in the No. 5 liquid channel 1215. The No. 3 pressure gauge 1265 is fixedly connected to the No. 1 control block 121, and the measuring end of the No. 3 pressure gauge 1265 is placed in the No. 2 liquid channel 1212. The No. 3 explosion-proof pressure transmitter 1266 is fixedly connected to the No. 1 control block 121, and the sensing end of the No. 3 explosion-proof pressure transmitter 1266 is placed in the No. 2 liquid channel 1212. The explosion-proof temperature transmitter 1267 is fixedly connected to the No. 1 control block 121, and the sensing end of the explosion-proof temperature transmitter 1267 is placed in the No. 2 liquid channel 1212.

[0046] A No. 4 liquid channel 1214 is provided through the No. 1 control block 121, and the measuring end of the No. 1 pressure gauge 1261 is placed in the No. 4 liquid channel 1214, and the sensing end of the No. 1 explosion-proof pressure transmitter 1262 is placed in the No. 4 liquid channel 1214, and the No. 4 liquid channel 1214 is connected with the No. 1 liquid channel 1211, so as to monitor the pressure change of the No. 1 liquid channel 1211 in real time, and record the pressure data through the No. 1 explosion-proof pressure transmitter 1262, and use the No. 1 pressure gauge 1261 as an auxiliary judgment tool to help The operator can quickly understand the pressure change trend of the hydraulic system by setting the No. 5 liquid channel 1215 through the No. 1 control block 121, placing the measuring end of the No. 2 pressure gauge 1263 in the No. 5 liquid channel 1215, placing the sensing end of the No. 2 explosion-proof pressure transmitter 1264 in the No. 5 liquid channel 1215, and connecting the No. 5 liquid channel 1215 with the No. 3 liquid channel 1213, monitoring the pressure change of the No. 3 liquid channel 1213 in real time, and recording the pressure data through the No. 2 explosion-proof pressure transmitter 1264. The pressure gauge 1263 is used as an auxiliary judgment tool to help operators quickly understand the pressure change trend of the hydraulic system. The No. 2 liquid channel 1212 is set through the No. 1 control block 121, and the measuring end of the No. 3 pressure gauge 1265 is placed in the No. 2 liquid channel 1212, the sensing end of the No. 3 explosion-proof pressure transmitter 1266 is placed in the No. 2 liquid channel 1212, and the sensing end of the temperature pressure transmitter is placed in the No. 2 liquid channel 1212. The pressure and temperature changes of the No. 2 liquid channel 1212 are monitored in real time. As an auxiliary judgment tool, gauge 1265 helps operators quickly understand the pressure change trend of the hydraulic system. Through the signals of explosion-proof pressure transmitter No. 1 1262, explosion-proof pressure transmitter No. 2 1264 and explosion-proof pressure transmitter No. 3 1266, the servo pump 11 and the accumulator 14 are controlled, and then the pressure of liquid channel No. 1 1211, liquid channel No. 2 1212 and liquid channel No. 3 1213 are controlled. The explosion-proof pressure transmitter and pressure gauge both adopt an external structure, which can be directly plugged in or screwed disassembled, which is convenient for repair and maintenance.

[0047] like Figure 7 to Figure 9As shown, the filtering mechanism 13 includes a No. 2 control block 131, a No. 3 one-way valve 132, a No. 1 filter 133, a No. 4 one-way valve 134, a No. 2 filter 135 and a fixed bracket 136. The No. 2 control block 131 is fixedly connected to the No. 1 control block 121. The No. 2 control block 131 is provided with a No. 6 liquid channel 1311, and the No. 6 liquid channel 1311 is connected to the No. 1 liquid channel 1211. There are four No. 3 one-way valves 132, and the No. 3 one-way valves 132 are placed in the No. 6 liquid channel 1311. The No. 1 filter 133 is fixedly connected to the No. 2 control block 131, and the No. 1 filter The filter end 133 is placed in the No. 6 liquid channel 1311, the No. 2 control block 131 is provided with a No. 7 liquid channel 1312, the No. 7 liquid channel 1312 is connected to the No. 3 liquid channel 1213, four No. 4 one-way valves 134 are provided, and the No. 4 one-way valves 134 are placed in the No. 7 liquid channel 1312, the No. 2 filter 135 is fixedly connected to the No. 2 control block 131, the filter end of the No. 2 filter 135 is placed in the No. 7 liquid channel 1312, the No. 2 control block 131 is provided with a cooling groove, the cooling groove is provided with a water inlet, the cooling groove is provided with a water outlet, and the solenoid valve 15 is fixedly connected to the water inlet.

[0048] The No. 2 control block 131 is fixed by a fixing bracket 136 to provide a stable working environment. A No. 6 liquid channel 1311 is provided through the No. 2 control block 131, and the No. 6 liquid channel 1311 is connected with the No. 1 liquid channel 1211, so that the oil can flow from the No. 1 liquid channel 1211 to the No. 6 liquid channel 1311. Four No. 3 one-way valves 132 and a No. 1 filter 133 are installed in the No. 6 liquid channel 1311 to form a loop, so that the oil passes through the No. 3 one-way valve 132, passes through the filtering end of the No. 1 filter 133, and finally flows into the boosting mechanism 2. A No. 7 liquid channel 1312 is provided through the No. 2 control block 131, and the oil flows through the boosting mechanism 2 to the No. 7 liquid channel 1312. The body channel 1312 is installed with four No. 4 one-way valves 134 and No. 2 filter 135 to form a loop, so that after the oil passes through the No. 4 one-way valve 134, it is filtered through the filtering end of the No. 2 filter 135, and is connected with the No. 3 liquid channel 1213 through the No. 7 liquid channel 1312, and finally the oil can flow from the No. 7 liquid channel 1312 to the No. 3 liquid channel 1213, and the cooling water enters the cooling groove through the provided water inlet. The cooling grooves are evenly distributed inside the No. 2 control block 131. The cooling water passes through the cooling groove, so that the cooling water absorbs the heat of the No. 2 control block 131, and absorbs the heat of the oil through the effect of heat transfer, and finally flows out from the water outlet, so that the cooling water cools the oil, and cooling and filtration can be carried out at the same time to improve the efficiency of the supercharger.

[0049] like Figure 1 and Fig.10As shown, the boosting mechanism 2 includes a booster 21, a proximity switch 22, a No. 4 explosion-proof pressure transmitter 23, a No. 5 explosion-proof pressure transmitter 24 and a fixed plate 25. The booster 21 and the proximity switch 22 are fixedly connected, the proximity switch 22 and the No. 2 control block 131 are fixedly connected, the No. 4 explosion-proof pressure transmitter 23 is placed outside the booster 21, the No. 5 explosion-proof pressure transmitter 24 is placed outside the booster 21, two fixed plates 25 are provided, the fixed plates 25 and the booster 21 are fixedly connected, and the fixed plates 25 and the base frame 3 are fixedly connected.

[0050] After being filtered and cooled, the oil enters the proximity switch 22 for unilateral operation, driving the supercharger 21 to compress the hydrogen. Two superchargers 21 are provided, one for intake and the other for exhaust. The supercharger 21 and the proximity switch 22 are fixedly connected. The supercharger 21 is controlled by the proximity switch 22 to compress the hydrogen. The proximity switch 22 is inserted into a suitable depth to protect the supercharger 21. The No. 4 explosion-proof pressure transmitter 23 is installed at the intake end outside the supercharger 21 to monitor the hydrogen intake pressure in real time. The No. 5 explosion-proof pressure transmitter 24 is installed at the exhaust end outside the supercharger 21 to monitor the hydrogen exhaust pressure in real time. Combined with the accumulation of previous data of the No. 2 explosion-proof pressure transmitter 1264 and the No. 3 explosion-proof pressure transmitter 1266, the appropriate pressure is output as needed through the control calculation simulation formula and calculation algorithm.

[0051] like Fig.10 and Fig.11 As shown, the proximity switch 22 includes a No. 1 housing 221, a No. 1 piston 222 and a piston rod 223. The No. 1 housing 221 is provided with a No. 1 active chamber 2211. The No. 1 piston 222 is placed in the No. 1 active chamber 2211. The piston rod 223 and the No. 1 piston 222 are fixedly connected. The piston and the No. 1 supercharger 21 are fixedly connected. The No. 1 housing 221 and the No. 1 supercharger 21 are fixedly connected. The piston rod 223 and the No. 2 supercharger 21 are fixedly connected. The No. 1 housing 221 and the No. 2 supercharger 21 are fixedly connected. The No. 1 active chamber 2211 is connected to the No. 6 liquid channel 1311 by a pipeline, and the No. 1 active chamber 2211 is connected to the No. 7 liquid channel 1312 by a pipeline.

[0052] A No. 1 active chamber 2211 is provided through the No. 1 housing 221, so that the No. 1 piston 222 can only move therein, and is connected to the supercharger 21 through the piston rod 223. The piston rod 223 is inserted to a suitable depth to protect the end covers 213 on both sides of the supercharger 21. The No. 1 active chamber 2211 and the No. 6 liquid channel 1311 are connected through a pipeline, so that oil enters one side of the No. 1 active chamber 2211. Through the forward and reverse operation of the servo pump 11, the No. 1 active chamber 2211 and the No. 7 liquid channel 1312 are connected through a pipeline, so that the oil flows from the other side of the No. 1 active chamber 2211 into the No. 7 liquid channel 1312, thereby causing the oil to push the No. 1 piston 222 to move back and forth.

[0053] like Fig.10 and Fig.11 As shown, the supercharger 21 includes a No. 2 shell 211, a No. 2 piston 212 and an end cover 213. The No. 2 shell 211 and the No. 1 shell 221 are fixedly connected. The No. 2 shell 211 is provided with a No. 2 active chamber 2111. The No. 2 piston 212 is placed in the No. 2 active chamber 2111. The No. 2 piston 212 and the piston rod 223 are fixedly connected. The end cover 213 and the No. 2 shell 211 are fixedly connected.

[0054] The No. 2 housing 211 is provided with a No. 2 active chamber 2111. By fixing the No. 2 piston 212 and the piston rod 223 placed in the No. 2 active chamber 2111, the No. 2 piston 212 can move back and forth with the No. 1 piston 222 to compress the incoming hydrogen. By inserting the piston rod 223 into the No. 2 active chamber 2111 to a suitable depth, the No. 2 piston 212 can be prevented from colliding with the end covers 213 on both sides of the supercharger 21 during operation, thereby protecting the supercharger 21.

[0055] Working principle: Hydrogen enters from the air inlet, and monitors the air inlet pressure through the external No. 4 explosion-proof pressure transmitter 23, and feeds back the signal to the explosion-proof servo motor. The explosion-proof servo motor drives the servo pump 11 to work in the forward direction according to the signal requirements. The internal oil is pressurized by the servo pump 11, so that the oil is sucked from the input end and flows out from the output end, thereby entering the No. 1 liquid channel 1211, and the oil flows into the No. 6 liquid channel 1311 in one direction through the No. 1 check valve 122, and the oil flows in one direction through the No. 3 check valve 132. The oil moves and passes through the filter, flows from the sixth liquid channel 1311 into the side of the first active chamber 2211, so that the oil pushes the first piston 222 to move, and the piston rod 223 is driven by the first piston 222, so that the second piston 212 moves to the side of the hydrogen entry direction to compress the hydrogen. The compressed hydrogen flows into the second supercharger 21 through the pipeline, and the explosion-proof servo motor reverses to drive the servo pump 11 to work in the reverse direction. The oil flows from the first active chamber 2211 into the sixth liquid channel 1311, and after being filtered, passes through the sixth The oil flows into the No. 1 liquid channel 1211 through the No. 1 liquid channel 1311, and flows into the No. 3 liquid channel 1213 through the servo pump 11, and flows into the No. 7 liquid channel 1312 through the one-way valve, and passes through the No. 4 one-way valve 134, so that the oil passes through the No. 2 filter 135 for filtration, and flows into the other side of the No. 1 active chamber 2211 through the pipeline, pushing the No. 1 piston 222 to move, and through the piston rod 223, the No. 2 piston 212 moves in the exhaust direction, and the hydrogen is compressed again. The exhaust gas is compressed and finally hydrogen is discharged. The exhaust pressure is monitored by an external No. 5 explosion-proof pressure transmitter 24. During the filtering process, cooling water enters the cooling tank through the cooling water inlet. The cooling water absorbs the heat of the oil in the cooling tank and finally flows out from the cooling water outlet, so that the oil is filtered and cooled at the same time. When an emergency occurs and the oil is insufficient, the accumulator 14 replenishes the No. 2 liquid channel 1212, and the oil flows from the No. 2 liquid channel 1212 into the No. 1 liquid channel 1211 or the No. 3 liquid channel 1213.

[0056] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A liquid-driven hydrogen compressor controlled by an electric servo EHA system, Features: The compressor comprises a hydraulic mechanism (1), a boosting mechanism (2) and a base frame (3); the hydraulic mechanism (1) and the boosting mechanism (2) are fixedly connected, and the boosting mechanism (2) and the base frame (3) are fixedly connected; The hydraulic mechanism (1) comprises a servo pump (11), a functional mechanism (12), a filtering mechanism (13), an accumulator (14) and a solenoid valve (15); the servo pump (11) and the functional mechanism (12) are fixedly connected, the functional mechanism (12) and the filtering mechanism (13) are fixedly connected, the accumulator (14) and the functional mechanism (12) are fixedly connected, and the solenoid valve (15) and the filtering mechanism (13) are fixedly connected.

2. According to claim 1, a method for controlling a liquid-driven hydrogen compressor based on an electric servo EHA system, Features: The functional mechanism (12) comprises a No. 1 control block (121), a No. 1 check valve (122), a No. 1 overflow valve (123), a No. 2 check valve (124), a No. 2 overflow valve (125) and a monitoring unit (126); the No. 1 control block (121) is provided with a No. 1 liquid channel (1211); the No. 1 check valve (122) and the No. 1 liquid channel (1211) are fixedly connected; the output port (111) of the servo pump (11) is in communication with the No. 1 liquid channel (1211); the No. 1 overflow valve (123) and the No. 1 liquid channel (1211) are fixedly connected; the No. 1 control block (121) is provided with a No. 2 liquid channel (1212); the No. 2 liquid channel (1212) is in communication with a pipeline of the accumulator (14); the No. 1 overflow valve (123) and the No. 1 liquid channel (1212) are in communication with a pipeline of the accumulator (14); the No. 1 overflow valve (123) and the No. 1 liquid channel (1212) are in communication with a pipeline of the accumulator (14); the No. 1 check valve (123) and the No. 1 liquid channel (1211) are fixedly connected; ) reflux port is connected to the second liquid channel (1212), the first control block (121) is provided with a third liquid channel (1213), the input port (112) of the servo pump (11) is connected to the third liquid channel (1213), the second check valve (124) is fixedly connected to the third liquid channel (1213), the second overflow valve (125) is fixedly connected to the third liquid channel (1213), the reflux port of the second overflow valve (125) is connected to the second liquid channel (1212), the monitoring unit (126) is fixedly connected to the first control block (121), the first liquid channel (1211) is connected to the second liquid channel (1212) by pipeline, and the third liquid channel (1213) is connected to the second liquid channel (1212) by pipeline.

3. According to claim 2, a method for controlling a liquid-driven hydrogen compressor based on an electric servo EHA system, Features: The monitoring unit (126) comprises a No. 1 pressure gauge (1261), a No. 1 explosion-proof pressure transmitter (1262), a No. 2 pressure gauge (1263), a No. 2 explosion-proof pressure transmitter (1264), a No. 3 pressure gauge (1265), a No. 3 explosion-proof pressure transmitter (1266) and an explosion-proof temperature transmitter (1267). The No. 1 control block (121) is provided with a No. 4 liquid channel (1214). The No. 1 pressure gauge (1261) and the No. 1 control block (121) The first pressure gauge (1261) is fixedly connected, the measuring end of the first pressure gauge (1261) is placed in the fourth liquid channel (1214), the first explosion-proof pressure transmitter (1262) and the first control block (121) are fixedly connected, the sensing end of the first explosion-proof pressure transmitter (1262) is placed in the fourth liquid channel (1214), the fourth liquid channel (1214) and the first liquid channel (1211) are connected, and the first control block (121) is provided with a fifth liquid channel (1215), The No. 2 pressure gauge (1263) is fixedly connected to the No. 1 control block (121), and the measuring end of the No. 2 pressure gauge (1263) is placed in the No. 5 liquid channel (1215). The No. 2 explosion-proof pressure transmitter (1264) is fixedly connected to the No. 1 control block (121), and the sensing end of the No. 2 explosion-proof pressure transmitter (1264) is placed in the No. 5 liquid channel (1215). The No. 3 pressure gauge (1265) is fixedly connected to the No. 1 control block (121), and the No. 3 explosion-proof pressure transmitter (1264) is fixedly connected to the No. 1 control block (121). The measuring end of the No. 1 pressure gauge (1265) is placed in the No. 2 liquid channel (1212), the No. 3 explosion-proof pressure transmitter (1266) is fixedly connected to the No. 1 control block (121), the sensing end of the No. 3 explosion-proof pressure transmitter (1266) is placed in the No. 2 liquid channel (1212), the explosion-proof temperature transmitter (1267) is fixedly connected to the No. 1 control block (121), and the sensing end of the explosion-proof temperature transmitter (1267) is placed in the No. 2 liquid channel (1212).

4. According to claim 3, a method for controlling a liquid-driven hydrogen compressor based on an electric servo EHA system, Features: The filtering mechanism (13) comprises a No. 2 control block (131), a No. 3 one-way valve (132), a No. 1 filter (133), a No. 4 one-way valve (134), a No. 2 filter (135) and a fixed bracket (136); the No. 2 control block (131) is fixedly connected to the No. 1 control block (121); the No. 2 control block (131) is provided with a No. 6 liquid channel (1311); the No. 6 liquid channel (1311) is connected to the No. 1 liquid channel (1211); four No. 3 one-way valves (132) are provided; the No. 3 one-way valves (132) are placed in the No. 6 liquid channel (1311); the No. 1 filter (133) is fixedly connected to the No. 2 control block (131); the No. 1 filter The filter end (133) is placed in the sixth liquid channel (1311), the second control block (131) is provided with a seventh liquid channel (1312), the seventh liquid channel (1312) is connected to the third liquid channel (1213), four fourth one-way valves (134) are provided, the fourth one-way valves (134) are placed in the seventh liquid channel (1312), the second filter (135) and the second control block (131) are fixedly connected, the filter end of the second filter (135) is placed in the seventh liquid channel (1312), the second control block (131) is provided with a cooling groove, the cooling groove is provided with a water inlet, the cooling groove is provided with a water outlet, and the solenoid valve (15) is fixedly connected to the water inlet.

5. According to claim 1, a method for controlling a liquid-driven hydrogen compressor based on an electric servo EHA system, Features: The boost mechanism (2) comprises a booster (21), a proximity switch (22), a No. 4 explosion-proof pressure transmitter (23), a No. 5 explosion-proof pressure transmitter (24) and a fixed plate (25); the booster (21) and the proximity switch (22) are fixedly connected; the proximity switch (22) and the No. 2 control block (131) are fixedly connected; the No. 4 explosion-proof pressure transmitter (23) is arranged outside the booster (21); the No. 5 explosion-proof pressure transmitter (24) is arranged outside the booster (21); two fixed plates (25) are provided; the fixed plates (25) and the booster (21) are fixedly connected; and the fixed plates (25) and the base frame (3) are fixedly connected.

6. The method according to claim 5, wherein the electric servo EHA system controls a liquid-driven hydrogen compressor. Features: The proximity switch (22) comprises a No. 1 housing (221), a No. 1 piston (222) and a piston rod (223); the No. 1 housing (221) is provided with a No. 1 active chamber (2211); the No. 1 piston (222) is disposed in the No. 1 active chamber (2211); the piston rod (223) and the No. 1 piston (222) are fixedly connected; the piston rod (223) and the supercharger (21) are fixedly connected; the No. 1 housing (221) and the supercharger (21) are fixedly connected; the No. 1 active chamber (2211) and the No. 6 liquid channel (1311) are connected by a pipeline; and the No. 1 active chamber (2211) and the No. 7 liquid channel (1312) are connected by a pipeline.

7. The method according to claim 6, wherein the electric servo EHA system controls a liquid-driven hydrogen compressor. Features: The supercharger (21) comprises a No. 2 housing (211), a No. 2 piston (212) and an end cover (213); the No. 2 housing (211) and the No. 1 housing (221) are fixedly connected; the No. 2 housing (211) is provided with a No. 2 movable chamber (2111); the No. 2 piston (212) is disposed in the No. 2 movable chamber (2111); the No. 2 piston (212) and the piston rod (223) are fixedly connected; and the end cover (213) and the No. 2 housing (211) are fixedly connected.

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