Power distribution system with constant voltage function for hydrogen refueling station

Abstract

The invention relates to a power distribution system with a constant voltage function for a hydrogen refueling station, and the system comprises a voltage regulation box, the rear end of the voltage regulation box is provided with a box body, and the right side of the box body is connected with a cover plate through a hinge; the telescopic rods are connected to four corners of the voltage regulation box; the rubber insulating layer is adhered to the interior of the voltage regulating box; and the metal block is mounted on the inner rear wall of the rubber insulating layer. The power distribution system with the constant voltage function for the hydrogen refueling station has the beneficial effects that the main body fixing mechanism of the equipment can be automatically loosened to facilitate disassembly when the equipment is opened, and can automatically clamp and fix the voltage regulation box when the equipment is closed, and meanwhile, the equipment can regulate the voltage of each branch to enable the voltage of the branch to be constant, so that the power distribution efficiency is improved. The equipment has the electromagnetic sealing function, the heat dissipation function and the vacuumizing function, the spontaneous combustion condition of the equipment can be well restrained, and the situation that spontaneous combustion flames are transmitted to the outside of the equipment to cause danger can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen refueling stations, and in particular to a power distribution system with a constant pressure function for a hydrogen refueling station. Background Art

[0002] A hydrogen refueling station is a gas station that provides hydrogen to fuel cell vehicles. Many devices in the hydrogen refueling station require electricity, so the power distribution system is a relatively important type of power equipment in the hydrogen refueling station.

[0003] The main structure inside the existing power distribution system is directly fixed to the equipment with screws. When the equipment needs to be disassembled, it is cumbersome. At the same time, the screws will become loose or rusty if not handled for a long time, which can easily cause the main structure to fall off or become unable to be disassembled.

[0004] Therefore, it is necessary to design a power distribution system with a constant pressure function for a hydrogen refueling station to address the above problems. Summary of the invention

[0005] The object of the present invention is to provide a power distribution system with a constant pressure function for a hydrogen refueling station to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a power distribution system with a constant pressure function for a hydrogen refueling station, comprising:

[0007] A voltage regulating box, wherein a box body is provided at the rear end of the voltage regulating box, and the right side of the box body is connected to the cover plate through a hinge;

[0008] Telescopic rods connected to the four corners of the voltage regulating box;

[0009] A piston connected to an end of the telescopic rod away from the voltage regulating box;

[0010] A sleeve rod, which is arranged outside the piston;

[0011] A rubber insulating layer bonded to the interior of the voltage regulating box;

[0012] A metal block which is mounted on the inner rear wall of the rubber insulation layer.

[0013] Preferably, the metal block is further provided with:

[0014] a power supply unit wound around the outside of the metal block;

[0015] A first constant voltage unit, which is wound around the outside of the metal block, and the first constant voltage unit is located in the counterclockwise direction of the power supply unit;

[0016] A second constant voltage unit, which is wound around the outside of the metal block, and the second constant voltage unit is located in the counterclockwise direction of the first constant voltage unit;

[0017] A third constant voltage unit is wound around the outside of the metal block, and the third constant voltage unit is located in the counterclockwise direction of the second constant voltage unit.

[0018] Preferably, the power supply unit further includes:

[0019] Power supply coil;

[0020] A power supply wire is connected to the upper and lower ends of the power supply coil.

[0021] Preferably, the first constant voltage unit further includes:

[0022] Electric slides;

[0023] A connecting block connected to the upper end of the electric slide rail;

[0024] A current-carrying copper sheet, which is movably connected to the interior of the connecting block;

[0025] A spring connected to the left and right sides of the energized copper sheet;

[0026] An energized coil, which is arranged at the lower end direction of the connecting block;

[0027] A current-carrying wire, one end of which is connected to one end of the current-carrying coil, and the other end of the current-carrying wire is connected to the current-carrying copper sheet;

[0028] A voltage sensor is connected to the middle section of the current-carrying wire.

[0029] Preferably, the first constant pressure unit further comprises:

[0030] a first fuse protection group connected to the right side of the first constant voltage unit;

[0031] A second fuse protection group, which is arranged at an upper end of the first fuse protection group;

[0032] A third fuse protection group is arranged at an upper end of the second fuse protection group, and the first fuse protection group, the second fuse protection group and the third fuse protection group are connected in parallel;

[0033] A first load, which is electrically connected to the first fuse protection group through a wire;

[0034] A second load, which is electrically connected to the second fuse protection group through a wire;

[0035] A third load is electrically connected to the third fuse protection group through a wire.

[0036] Preferably, the second constant pressure unit is further provided with:

[0037] a fourth fuse protection group, which is installed at the upper end of the second constant voltage unit;

[0038] a fifth fuse protection group, which is installed on the left side of the fourth fuse protection group;

[0039] a sixth fuse protection group, which is installed on the left side of the fifth fuse protection group;

[0040] a fourth load, which is electrically connected to the fourth fuse protection group through a wire;

[0041] a fifth load, which is electrically connected to the fifth fuse protection group through a wire;

[0042] A sixth load is electrically connected to the sixth fuse protection group through a wire.

[0043] Preferably, the third constant pressure unit is further provided with:

[0044] An electromagnetic unit, which is electrically connected to the third constant voltage unit through a wire, and the electromagnetic unit is connected to the left side of the third constant voltage unit;

[0045] a heat dissipation unit, which is electrically connected to the third constant voltage unit through a wire, and the heat dissipation unit is arranged at the rear end of the electromagnetic unit;

[0046] A vacuum unit is electrically connected to the third constant voltage unit through a wire, and the vacuum unit is arranged at the upper end of the heat dissipation unit.

[0047] Preferably, the electromagnetic unit further comprises:

[0048] The seventh fuse protection group;

[0049] A first connecting wire connected to the left side of the seventh fuse protection group;

[0050] The electromagnet is connected to the upper and lower ends of the first connecting wire.

[0051] Preferably, the heat dissipation unit further includes:

[0052] Condensing machine;

[0053] A second connecting wire connected to the upper end of the condensing machine;

[0054] an eighth fuse protection group, connected to the right end of the second connecting wire;

[0055] A condenser pipe is connected to the right side of the condenser.

[0056] Preferably, the vacuum unit further comprises:

[0057] Vacuum pump;

[0058] a one-way valve connected to the right side of the vacuum pump;

[0059] a third connecting wire connected to the lower end of the vacuum pump;

[0060] A ninth fuse protection group is connected to the right end of the third connecting wire.

[0061] Compared with the prior art, the beneficial effects of the present invention are: the main fixing mechanism of the device will automatically loosen when the device is opened for easy disassembly, and automatically clamp and fix the voltage regulating box when the device is closed. At the same time, the device can adjust the voltage of each branch to make the branch voltage constant. The device has electromagnetic sealing function, heat dissipation function and vacuum pumping function, which can effectively suppress the spontaneous combustion of the equipment and prevent the spontaneous combustion flame from being transmitted to the outside of the equipment and causing danger.

[0062] 1. The present invention relies on the cover plate to be closed through the rotating structure formed between the hinge and the box body, and can evacuate the inside of the device, so that the gas inside the sleeve rod can expand and push the piston, so that the telescopic rod clamps and fixes the voltage regulating box. When the device is opened, the internal air pressure of the device increases and the gas inside the sleeve rod will shrink, thereby controlling the contraction of the telescopic rod, so that the clamping of the telescopic rod on the voltage regulating box is loosened, making it convenient for the staff to take out the voltage regulating box for maintenance and other operations.

[0063] 2. The present invention can drive the connection block to move through the electric slide rail, so that the energized copper sheet can contact different positions of the energized coil, thereby adjusting the effective number of turns of the energized coil, thereby controlling the voltage change generated inside the energized coil, and enabling the equipment to be adjusted according to the power supply voltage, so that the voltage output by the energized wire is at a constant value, which is convenient for the smooth operation of the electrical appliances inside the hydrogen filling station.

[0064] 3. After the cover is closed, the present invention can adsorb the cover through an electromagnet, so that the cover can be tightly closed, maintaining the sealing of the equipment, preventing external air from entering the closed interior of the equipment, causing changes in the internal air pressure of the equipment, and thus failing to achieve the desired effect. At the same time, the interior of the equipment can be cooled by the condenser and the condenser tube, maintaining the smooth operation of the equipment while preventing the internal temperature of the equipment from being too high and spontaneously combusting.

[0065] 4. The present invention can extract the air inside the box through a vacuum pump, thereby forming a vacuum environment inside the box, preventing other parts inside the device from being ignited when electric sparks appear inside the device, causing damage to the parts inside the device, and also preventing the device from burning and causing external combustion, thereby causing danger. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1It is a front view structural schematic diagram of a power distribution system with a constant pressure function for a hydrogen refueling station of the present invention;

[0067] Figure 2 It is a schematic diagram of an enlarged cross-section structure of a voltage regulating box of a power distribution system with a constant voltage function for a hydrogen refueling station according to the present invention;

[0068] Figure 3 A power distribution system with a constant pressure function for a hydrogen refueling station according to the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0069] Figure 4 A power distribution system with a constant pressure function for a hydrogen refueling station according to the present invention Figure 2 The enlarged structural diagram at B in the middle;

[0070] Figure 5 The present invention is a schematic flow chart of a power distribution system with a constant pressure function for a hydrogen refueling station.

[0071] In the figure: 1, voltage regulating box; 2, telescopic rod; 3, piston; 4, sleeve rod; 5, box body; 6, hinge; 7, cover plate; 8, rubber insulation layer; 9, metal block; 10, power supply unit; 1001, power supply coil; 1002, power supply wire; 11, first constant voltage unit; 1101, electric slide rail; 1102, connecting block; 1103, energized copper sheet; 1104, spring; 1105, energized coil; 1106, energized wire; 1107, voltage sensor; 12, second constant voltage unit; 13, third constant voltage unit; 14, first fuse protection group; 15, second fuse protection group; 16, third fuse protection group; 17, first load; 18, second load; 19, third load; 20, fourth fuse protection group; 21, fifth fuse protection group; 22, sixth fuse protection group; 23, fourth load; 24, fifth load; 25, sixth load; 26, electromagnetic unit; 2601, seventh fuse protection group; 2602, first connecting wire; 2603, electromagnet; 27, heat dissipation unit; 2701, condenser; 2702, second connecting wire; 2703, eighth fuse protection group; 2704, condenser; 28, vacuum unit; 2801, vacuum pump; 2802, one-way valve; 2803, third connecting wire; 2804, ninth fuse protection group. DETAILED DESCRIPTION

[0072] See also Figure 1-5 The present invention provides a technical solution: a power distribution system with a constant pressure function for a hydrogen refueling station, comprising:

[0073] A voltage regulating box 1, the rear end of which is provided with a box body 5, the right side of which is connected to a cover plate 7 via a hinge 6;

[0074] Telescopic rods 2, which are connected to the four corners of the voltage regulating box 1;

[0075] A piston 3 connected to an end of the telescopic rod 2 away from the voltage regulating box 1;

[0076] A sleeve rod 4, which is arranged outside the piston 3;

[0077] A rubber insulating layer 8, which is bonded to the inside of the voltage regulating box 1;

[0078] The metal block 9 is mounted on the inner rear wall of the rubber insulating layer 8. After the cover plate 7 is closed by the rotating structure formed between the hinge 6 and the box body 5, the inside of the device can be vacuumed, so that the gas inside the sleeve rod 4 can expand and push the piston 3, so that the telescopic rod 2 clamps and fixes the voltage regulating box 1. When the device is turned on, the internal air pressure of the device increases and the gas inside the sleeve rod 4 will shrink, thereby controlling the contraction of the telescopic rod 2, so that the clamping of the telescopic rod 2 on the voltage regulating box 1 is loosened, so that the staff can take out the voltage regulating box 1 for maintenance and other operations;

[0079] The metal block 9 also has:

[0080] A power supply unit 10, which is wound around the outside of the metal block 9;

[0081] A first constant voltage unit 11, which is wound around the outside of the metal block 9, and the first constant voltage unit 11 is located counterclockwise of the power supply unit 10;

[0082] A second constant voltage unit 12, which is wound around the outside of the metal block 9, and the second constant voltage unit 12 is located in the counterclockwise direction of the first constant voltage unit 11;

[0083] A third constant voltage unit 13, which is wound around the outside of the metal block 9, and the third constant voltage unit 13 is located in the counterclockwise direction of the second constant voltage unit 12;

[0084] The power supply unit 10 further includes:

[0085] Power supply coil 1001;

[0086] A power supply wire 1002 connected to the upper and lower ends of the power supply coil 1001;

[0087] The first constant voltage unit 11 further includes:

[0088] Electric slide 1101;

[0089] A connecting block 1102 connected to the upper end of the electric slide rail 1101;

[0090] The energized copper sheet 1103 is movably connected to the inside of the connecting block 1102;

[0091] Spring 1104, which is connected to the left and right sides of the energized copper sheet 1103;

[0092] An energized coil 1105 is disposed at the lower end of the connection block 1102;

[0093] A power-carrying wire 1106, one end of which is connected to one end of the power-carrying coil 1105, and the other end of the power-carrying wire 1106 is connected to the power-carrying copper sheet 1103;

[0094] The voltage sensor 1107 is connected to the middle section of the power-carrying wire 1106. The electric slide rail 1101 can drive the connection block 1102 to move, so that the power-carrying copper sheet 1103 contacts different positions of the power-carrying coil 1105, so as to adjust the effective number of turns of the power-carrying coil 1105, thereby controlling the voltage change generated inside the power-carrying coil 1105, so that the device can be adjusted according to the power supply voltage, so that the voltage output by the power-carrying wire 1106 is at a constant value, which is convenient for the stable operation of the electrical appliances inside the hydrogen filling station;

[0095] The first constant voltage unit 11 is further provided with:

[0096] A first fuse protection group 14, which is connected to the right side of the first constant voltage unit 11;

[0097] A second fuse protection group 15, which is arranged at the upper end of the first fuse protection group 14;

[0098] A third fuse protection group 16 is arranged at the upper end of the second fuse protection group 15, and the first fuse protection group 14, the second fuse protection group 15 and the third fuse protection group 16 are connected in parallel;

[0099] A first load 17, which is electrically connected to the first fuse protection group 14 via a wire;

[0100] A second load 18, which is electrically connected to the second fuse protection group 15 via a wire;

[0101] A third load 19, which is electrically connected to the third fuse protection group 16 via a wire;

[0102] The second constant voltage unit 12 is further provided with:

[0103] A fourth fuse protection group 20, which is installed at the upper end of the second constant voltage unit 12;

[0104] a fifth fuse protection group 21, which is installed on the left side of the fourth fuse protection group 20;

[0105] a sixth fuse protection group 22, which is installed on the left side of the fifth fuse protection group 21;

[0106] A fourth load 23, which is electrically connected to the fourth fuse protection group 20 via a wire;

[0107] a fifth load 24, which is electrically connected to the fifth fuse protection group 21 via a wire;

[0108] a sixth load 25, which is electrically connected to the sixth fuse protection group 22 via a wire;

[0109] The third constant voltage unit 13 is further provided with:

[0110] The electromagnetic unit 26 is electrically connected to the third constant voltage unit 13 through a wire, and the electromagnetic unit 26 is connected to the left side of the third constant voltage unit 13;

[0111] The heat dissipation unit 27 is electrically connected to the third constant voltage unit 13 through a wire, and the heat dissipation unit 27 is arranged at the rear end of the electromagnetic unit 26;

[0112] A vacuum unit 28, which is electrically connected to the third constant voltage unit 13 through a wire, and the vacuum unit 28 is arranged at the upper end of the heat dissipation unit 27;

[0113] The electromagnetic unit 26 also includes:

[0114] The seventh fuse protection group 2601;

[0115] A first connecting wire 2602, which is connected to the left side of the seventh fuse protection group 2601;

[0116] The electromagnet 2603 is connected to the upper and lower ends of the first connecting wire 2602. After the cover plate 7 is closed, the electromagnet 2603 can adsorb the cover plate 7, so that the cover plate 7 can be tightly closed to maintain the sealing of the device, and prevent the outside air from entering the closed device, causing the internal air pressure of the device to change, thereby failing to achieve the desired effect. At the same time, the condenser 2701 and the condenser tube 2704 can cool the inside of the device, so as to keep the device running smoothly and prevent the internal temperature of the device from being too high and spontaneously igniting;

[0117] The heat dissipation unit 27 further includes:

[0118] Condenser 2701;

[0119] A second connecting wire 2702 connected to the upper end of the condensing machine 2701;

[0120] An eighth fuse protection group 2703 connected to the right end of the second connecting wire 2702;

[0121] Condensation pipe 2704, which is connected to the right side of condenser 2701;

[0122] The vacuum unit 28 also includes:

[0123] Vacuum pump 2801;

[0124] A one-way valve 2802 connected to the right side of the vacuum pump 2801;

[0125] A third connecting wire 2803, which is connected to the lower end of the vacuum pump 2801;

[0126] The ninth fuse protection group 2804 is connected to the right end of the third connecting wire 2803. The air in the box 5 can be pumped out by the vacuum pump 2801, so that a vacuum environment can be formed inside the box 5 to prevent other parts inside the device from being ignited when electric sparks appear inside the device, thereby damaging the parts inside the device. At the same time, it can also prevent the device from burning and causing external combustion, thereby causing danger.

[0127] The main fixing mechanism of the device will automatically loosen when the device is opened for easy disassembly, and automatically clamp and fix the voltage regulating box 1 when the device is closed. At the same time, the device can adjust the voltage of each branch to make the branch voltage constant. The device has electromagnetic sealing function, heat dissipation function and vacuum function, which can effectively suppress the spontaneous combustion of the equipment and prevent the spontaneous combustion flame from being transmitted to the outside of the equipment and causing danger.

[0128] Working principle: The device relies on the cover plate 7 to close the cover plate 7 through the rotating structure formed between the hinge 6 and the box body 5, and the electromagnet 2603 is energized through the first connecting wire 2602 (the electromagnet 2603 is overload protected through the seventh fuse protection group 2601), so that the electromagnet 2603 adsorbs the cover plate 7 and seals the device, and the condenser 2701 is energized through the second connecting wire 2702 (the condenser 2701 is overload protected through the eighth fuse protection group 2703), and then the inside of the device is cooled down through the condenser pipe 2704, and then the third connecting wire 2702 is used to energize the condenser 2701. The connecting wire 2803 is used to energize the vacuum pump 2801 (the ninth fuse protection group 2804 is used to protect the vacuum pump 2801 from overload), so that the inside of the device is evacuated into a vacuum. The one-way valve 2802 can prevent the air from flowing back after the device is evacuated into a vacuum. When the inside of the device is vacuumed, the gas inside the sleeve rod 4 can expand and push the piston 3, so that the telescopic rod 2 is extended to clamp and fix the voltage regulating box 1. When the device is in use, the power supply coil 1001 is energized through the power supply wire 1002 to form power supply, and the magnetic flux lines are conducted through the metal block 9, so that the first constant voltage unit 11 and the second constant voltage unit 11 are The element 12 and the third constant voltage unit 13 can generate voltage (the transformer principle is applied here), and the voltage of the current-carrying wire 1106 is detected by the voltage sensor 1107, and then the connecting block 1102 can be driven to move by the electric slide rail 1101, so that the current-carrying copper sheet 1103 contacts different positions of the current-carrying coil 1105 (relying on the movable connection between the current-carrying copper sheet 1103 and the connecting block 1102, and the elastic structure formed by the current-carrying copper sheet 1103 through the spring 1104 and the connecting block 1102 facilitates the current-carrying copper sheet 1103 to pass through the current-carrying coil 1105), so that The effective number of turns of the energized coil 1105 is adjusted to control the voltage change generated inside the energized coil 1105, so that the voltages output by the first constant voltage unit 11, the second constant voltage unit 12 and the third constant voltage unit 13 are all maintained at the same value, so that the device maintains a constant voltage output power, and the first load 17, the second load 18, the third load 19, the fourth load 23, the fifth load 24 and the sixth load 25 are respectively protected from overload by the first fuse protection group 14, the second fuse protection group 15, the third fuse protection group 16, the fourth fuse protection group 20, the fifth fuse protection group 21 and the sixth fuse protection group 22.

Claims

1. A power distribution system with a constant pressure function for a hydrogen refueling station, characterized in that: include: A voltage regulating box, wherein a box body is provided at the rear end of the voltage regulating box, and the right side of the box body is connected to the cover plate through a hinge; Telescopic rods connected to the four corners of the voltage regulating box; A piston connected to an end of the telescopic rod away from the voltage regulating box; A sleeve rod, which is arranged outside the piston; A rubber insulating layer bonded to the interior of the voltage regulating box; A metal block which is mounted on the inner rear wall of the rubber insulation layer.

2. A power distribution system with a constant pressure function for a hydrogen refueling station according to claim 1, characterized in that: The metal block also has: a power supply unit wound around the outside of the metal block; A first constant voltage unit, which is wound around the outside of the metal block, and the first constant voltage unit is located in the counterclockwise direction of the power supply unit; A second constant voltage unit, which is wound around the outside of the metal block, and the second constant voltage unit is located in the counterclockwise direction of the first constant voltage unit; A third constant voltage unit is wound around the outside of the metal block, and the third constant voltage unit is located in the counterclockwise direction of the second constant voltage unit.

3. A power distribution system with a constant pressure function for a hydrogen refueling station according to claim 2, characterized in that: The power supply unit further includes: Power supply coil; A power supply wire is connected to the upper and lower ends of the power supply coil.

4. A power distribution system with a constant pressure function for a hydrogen refueling station according to claim 2, characterized in that: The first constant voltage unit further includes: Electric slides; A connecting block connected to the upper end of the electric slide rail; A current-carrying copper sheet, which is movably connected to the interior of the connecting block; A spring connected to the left and right sides of the energized copper sheet; An energized coil, which is arranged at the lower end direction of the connecting block; A current-carrying wire, one end of which is connected to one end of the current-carrying coil, and the other end of the current-carrying wire is connected to the current-carrying copper sheet; A voltage sensor is connected to the middle section of the current-carrying wire.

5. A power distribution system with a constant pressure function for a hydrogen refueling station according to claim 2, characterized in that: The first constant pressure unit further comprises: a first fuse protection group connected to the right side of the first constant voltage unit; A second fuse protection group, which is arranged at an upper end of the first fuse protection group; A third fuse protection group is arranged at an upper end of the second fuse protection group, and the first fuse protection group, the second fuse protection group and the third fuse protection group are connected in parallel; A first load, which is electrically connected to the first fuse protection group through a wire; A second load, which is electrically connected to the second fuse protection group through a wire; A third load is electrically connected to the third fuse protection group through a wire.

6. A power distribution system with a constant pressure function for a hydrogen refueling station according to claim 2, characterized in that: The second constant pressure unit further comprises: a fourth fuse protection group, which is installed at the upper end of the second constant voltage unit; a fifth fuse protection group, which is installed on the left side of the fourth fuse protection group; a sixth fuse protection group, which is installed on the left side of the fifth fuse protection group; a fourth load, which is electrically connected to the fourth fuse protection group through a wire; a fifth load, which is electrically connected to the fifth fuse protection group through a wire; A sixth load is electrically connected to the sixth fuse protection group through a wire.

7. A power distribution system with a constant pressure function for a hydrogen refueling station according to claim 2, characterized in that: The third constant voltage unit is further provided with: An electromagnetic unit, which is electrically connected to the third constant voltage unit through a wire, and the electromagnetic unit is connected to the left side of the third constant voltage unit; a heat dissipation unit, which is electrically connected to the third constant voltage unit through a wire, and the heat dissipation unit is arranged at the rear end of the electromagnetic unit; A vacuum unit is electrically connected to the third constant voltage unit through a wire, and the vacuum unit is arranged at the upper end of the heat dissipation unit.

8. A power distribution system with a constant pressure function for a hydrogen refueling station according to claim 7, characterized in that: The electromagnetic unit also includes: The seventh fuse protection group; A first connecting wire connected to the left side of the seventh fuse protection group; The electromagnet is connected to the upper and lower ends of the first connecting wire.

9. A power distribution system with a constant pressure function for a hydrogen refueling station according to claim 7, characterized in that: The heat dissipation unit further comprises: Condensing machine; A second connecting wire connected to the upper end of the condensing machine; an eighth fuse protection group, connected to the right end of the second connecting wire; A condenser pipe is connected to the right side of the condenser.

10. A power distribution system with a constant pressure function for a hydrogen refueling station according to claim 7, characterized in that: The vacuum unit also includes: Vacuum pump; a one-way valve connected to the right side of the vacuum pump; a third connecting wire connected to the lower end of the vacuum pump; A ninth fuse protection group is connected to the right end of the third connecting wire.

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