Off-grid methanol electrolysis hydrogen production and power supply all-in-one machine

Abstract

The utility model discloses an off-grid methanol electrolysis hydrogen production and power supply all-in-one machine, and relates to the technical field of hydrogen production devices. The energy storage battery is arranged in the case; the direct-current power supply is connected with the energy storage battery through a circuit; the methanol electrolysis hydrogen production reactor is connected with the direct-current power supply through a circuit; a methanol tank and a water tank; the hydrogen charging module is connected with a hydrogen outlet of the methanol electrolysis hydrogen production reactor; the gas cylinder bin is connected with the hydrogen charging module through a hydrogen charging connector, and the hydrogen storage cylinder is detachably inserted into the gas cylinder bin. According to the methanol electrolysis hydrogen production reactor, methanol can be directly electrolyzed to prepare hydrogen, the hydrogen of the methanol can be utilized by electrolysis of methanol, hydrogen can be obtained from water, and the utilization rate of hydrogen is very high; the methanol electrolysis hydrogen production has the advantages that methanol electrolysis only needs very low voltage, the energy storage battery can meet the power consumption of the methanol electrolysis hydrogen production reactor under the application scene without a power grid, and the hydrogen production function can be used indoors and outdoors.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production devices, in particular to a direct methanol electrolysis hydrogen production and power supply device. Background Art

[0002] Hydrogen energy is a secondary energy source with abundant sources, green and low carbon, and wide applications. It can help to absorb renewable energy on a large scale, realize large-scale peak load regulation of power grids, and cross-seasonal and cross-regional energy storage, and accelerate the low-carbonization of industries, construction, transportation, etc. my country has a good hydrogen production foundation and a large-scale application market, and has significant advantages in developing hydrogen energy.

[0003] At present, miniaturized hydrogen fuel cells and hydrogen storage bottles are gradually being used and popularized in people's lives, such as hydrogen mobile power supplies, hydrogen bicycles and hydrogen drones, which are all integrated with small hydrogen fuel cell stacks and hydrogen storage bottles. However, hydrogen refueling stations are unevenly distributed in various places and are relatively small in number. Hydrogen refueling stations mainly provide hydrogen refueling services for hydrogen vehicles. For ordinary users' hydrogen equipment, hydrogen refueling is difficult, which has become a problem restricting the development of hydrogen energy products.

[0004] To this end, a small hydrogen production and filling device has been developed on the market to meet the user's frequent hydrogen refueling needs. With a small hydrogen production and filling device, users can produce, refuel and use hydrogen by themselves, which promotes the development and market promotion of hydrogen equipment. The current small hydrogen production and filling device uses a PEM electrolyzer to produce hydrogen by electrolysis of pure water and is powered by 220V mains electricity. The hydrogen produced is of high purity and pollution-free.

[0005] For example, the Chinese utility model patent No. 2023205301457 discloses a small hydrogen production and filling device, including a chassis, a hydrogen production module, a hydrogen filling module and a gas cylinder warehouse. The hydrogen production module includes: a PEM electrolyzer, a water tank suitable for providing water required by the PEM electrolyzer, and a power supply for the PEM electrolyzer. Figure 1 It can be seen that the power supply is a 220V plug.

[0006] In addition, the Chinese utility model patent with patent number 202223584354.4 discloses a hydrogen production and hydrogen filling integrated machine, including a hydrogen production system and a hydrogen filling system. The hydrogen production system includes a power module, a water purification unit electrically connected to the power module, a water electrolysis battery unit, a gas-water separation unit, a condensation unit and a drying unit. The water purification unit provides water for electrolysis for the water electrolysis battery unit; the water electrolysis battery unit produces hydrogen by electrolyzing water.

[0007] However, the energy consumption of hydrogen production by water electrolysis is very high, and hydrogen can only be produced when connected to the power grid. In some outdoor applications without power grid, it cannot meet the use requirements; for example, in RVs and yachts, it is not suitable to use small hydrogen production and filling devices with built-in PEM electrolyzers.

[0008] Therefore, there is an urgent need to provide a small, portable hydrogen production and filling device that can be used in off-grid scenarios. Summary of the invention

[0009] The purpose of the utility model is to overcome the deficiencies in the prior art, and the utility model provides an off-grid type methanol electrolysis hydrogen production and power supply integrated machine.

[0010] To achieve the above purpose, the utility model provides the following technical solutions, the off-grid methanol electrolysis hydrogen production and power supply integrated machine comprises:

[0011] Chassis;

[0012] An energy storage battery is arranged inside the chassis;

[0013] A direct current power supply, connected to the energy storage battery by a circuit;

[0014] A methanol electrolysis hydrogen production reactor, connected to the DC power supply by a circuit;

[0015] A methanol tank and a water tank, wherein the methanol tank supplies methanol to the electrolysis methanol hydrogen production reactor, and the water tank supplies water to the electrolysis methanol hydrogen production reactor;

[0016] A hydrogen charging module connected to the hydrogen outlet of the electrolytic methanol hydrogen production reactor;

[0017] The gas cylinder warehouse is connected to the hydrogen filling module by a hydrogen filling joint, and the hydrogen storage bottle is detachably plugged into the gas cylinder warehouse. The hydrogen filling module fills the hydrogen output by the electrolysis methanol hydrogen production reactor into the hydrogen storage bottle.

[0018] By adopting the above technical solution, the advantage of producing hydrogen from methanol electrolysis is that only a very low voltage is required for the electrolysis of methanol. The electrolysis of methanol can not only utilize the hydrogen in methanol itself, but also obtain hydrogen from water, and the utilization rate of hydrogen is very high. Studies have shown that the electrolysis of methanol to produce hydrogen can significantly reduce energy consumption. At the same rate, the voltage of methanol electrolysis is only 1 / 3 of the voltage of water electrolysis. Therefore, configuring an energy storage battery can meet the energy consumption of the methanol electrolysis hydrogen production reactor, and become a mobile hydrogen production and filling device, which can be used in scenarios without power grids. Equipped with a hydrogen fuel cell, the energy storage battery can be charged and can be used for a long period of time.

[0019] Preferably, the energy storage battery has an AC input terminal, a DC output terminal and a first Type-C interface, and the DC output terminal is connected to the input terminal of the DC power supply by a circuit.

[0020] By adopting the above technical solution, the energy storage battery has an AC input terminal at one end and a DC output terminal at the other end. The AC input terminal is used to charge the energy storage battery, and the DC output terminal is used to supply power to the electrical load. The energy storage battery can be charged and discharged.

[0021] Preferably, the AC input terminal extends out to a side wall of the chassis.

[0022] By adopting the above technical solution, the AC input terminal can be connected from the outside of the chassis to charge the energy storage battery.

[0023] Preferably, it also includes a hydrogen fuel cell and a DCDC converter, the hydrogen fuel cell is installed in the chassis, the hydrogen charging module is connected to the hydrogen inlet of the hydrogen fuel cell through a hydrogen pipeline, the hydrogen fuel cell and the DCDC converter are connected by a circuit, the DCDC converter has a second Type-C interface, and the first Type-C interface is connected to the second Type-C interface.

[0024] By adopting the above technical solution, a part of the hydrogen output by the electrolytic methanol hydrogen production reactor is input into the hydrogen fuel cell through the hydrogen charging module. The hydrogen fuel cell uses hydrogen to generate electricity, and the electrical energy is converted through the DCDC converter and input into the energy storage battery to charge the energy storage battery. The energy storage battery is then used to supply the electricity required for hydrogen production by the electrolytic methanol hydrogen production reactor, which can significantly improve the battery life of the energy storage battery.

[0025] Preferably, it also includes a gas-water unit and a drying unit, and the electrolysis methanol hydrogen production reactor, the gas-water unit, the drying unit and the hydrogen charging module are connected in sequence.

[0026] By adopting the above technical solution, the hydrogen output from the electrolytic methanol hydrogen production reactor contains a small amount of water, and the gas and water are separated through the gas-water unit and the drying unit.

[0027] Preferably, the methanol tank is connected to the methanol electrolysis hydrogen production reactor through a methanol pipeline, a methanol pump is provided on the methanol pipeline, and the water tank is connected to the methanol electrolysis hydrogen production reactor through a water pipe, a water pump is provided on the water pipe.

[0028] By adopting the above technical scheme, the methanol pump inputs methanol into the electrolytic methanol hydrogen production reactor at a certain flow rate, and the water pump inputs pure water into the electrolytic methanol hydrogen production reactor at a certain flow rate. According to the output voltage of the energy storage battery, the output of the methanol pump and the water pump are adjusted to match the input amount of methanol and water with the electrolysis voltage, thereby ensuring efficient electrolysis of methanol and water.

[0029] Preferably, the hydrogen storage bottle is a solid-state hydrogen storage bottle, and the hydrogen storage bottle is filled with hydrogen storage material.

[0030] By adopting the above technical solutions, solid-state hydrogen storage bottles are safe and reliable, and are suitable for use in products such as hydrogen-powered bicycles and hydrogen-powered drones.

[0031] Preferably, the inlet end of the gas cylinder warehouse extends out to the side wall of the chassis, and the inlet end of the gas cylinder warehouse is provided with an outer cover.

[0032] By adopting the above technical solution, the outer cover can be opened and the hydrogen storage bottle can be inserted or pulled out from the gas cylinder bin from the outside of the chassis, which is easy to operate.

[0033] Preferably, a plurality of heat dissipation holes are evenly distributed on the side wall of the chassis, and a heat dissipation fan is arranged inside the chassis.

[0034] By adopting the above technical solution, the heat dissipation fan and the plurality of heat dissipation holes cooperate to dissipate heat inside the chassis.

[0035] Compared with the related art, the off-grid methanol electrolysis hydrogen production and power supply integrated machine provided by the utility model has the following beneficial effects:

[0036] 1. The utility model adopts a methanol electrolysis hydrogen production reactor, which can directly electrolyze methanol to prepare hydrogen. The advantage of methanol electrolysis hydrogen production is that only a very low voltage is required for the electrolysis of methanol. The methanol electrolysis can not only utilize the hydrogen of the methanol itself, but also obtain hydrogen from water, and the utilization rate of hydrogen is very high.

[0037] 2. The input voltage required for direct electrolysis of methanol to produce hydrogen in the utility model is very low. The use of energy storage batteries can meet the power consumption of the methanol electrolysis hydrogen production reactor. Even in application scenarios without power grids, the methanol electrolysis hydrogen production reactor can be powered by energy storage batteries, and the hydrogen production function can be used both indoors and outdoors.

[0038] 3. The energy storage battery of the utility model has an AC input terminal and a DC output terminal. The energy storage battery can be charged with alternating current through the AC input terminal, and the energy storage battery can output direct current to the electrolysis methanol hydrogen production reactor through the DC output terminal, which has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The utility model is a three-dimensional off-grid type electrolysis methanol hydrogen production and power supply integrated machine Figure 1 ;

[0040] Figure 2 The utility model is a three-dimensional off-grid type electrolysis methanol hydrogen production and power supply integrated machine Figure 2 ;

[0041] Figure 3 The internal structure of the off-grid methanol electrolysis hydrogen production and power supply integrated machine of the utility model Figure 1 ;

[0042] Figure 4 The internal structure of the off-grid methanol electrolysis hydrogen production and power supply integrated machine of the utility model Figure 1 ;

[0043] Figure 5 It is a three-dimensional diagram of the energy storage battery of the present utility model.

[0044] Figure numerals: 1. chassis; 11. heat dissipation holes; 12. cooling fan; 2. energy storage battery; 21. AC input terminal; 22. DC output terminal; 23. first Type-C interface; 3. DC power supply; 4. electrolysis methanol hydrogen production reactor; 5. methanol tank; 51. methanol pump; 6. water tank; 71. hydrogen filling pipeline; 8. gas cylinder warehouse; 81. outer cover; 9. hydrogen storage bottle; 101. gas-water unit; 102. drying unit; 13. support plate; 14. hydrogen fuel cell. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0046] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connection" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0048] like Figure 1-5 As shown, the off-grid methanol electrolysis hydrogen production and power supply integrated machine provided in this embodiment includes: a chassis 1 and an energy storage battery 2 arranged in the chassis 1, a DC power supply 3, a methanol electrolysis hydrogen production reactor 4, a methanol tank 5, a water tank 6, a hydrogen charging module, a gas cylinder warehouse 8 and a hydrogen storage bottle 9.

[0049] Specifically, the chassis 1 is a rectangular box-shaped structure, having a front panel, a rear panel, a left panel, a right panel, a top panel and a bottom panel, and the interior thereof is a receiving cavity. The energy storage battery 2 is a lithium battery, which has the advantages of small size, light weight and large storage capacity. The DC power supply 3 is arranged on the rear wall of the chassis 1, and the energy storage battery 2 and the DC power supply 3 are connected by a circuit, and the DC power supply 3 converts the voltage output by the energy storage battery 2 into the voltage required by the electrolysis methanol hydrogen production reactor 4.

[0050] The methanol electrolysis hydrogen production reactor 4 and the energy storage battery 2 are both installed on the bottom panel of the chassis 1, close to the side of the front panel. The methanol electrolysis hydrogen production reactor 4 is connected to the DC power supply 3 by circuit, and the DC power supply 3 is used to supply power to the methanol electrolysis hydrogen production reactor 4. The methanol electrolysis hydrogen production reactor 4 uses methanol and water as raw materials to electrolyze hydrogen. The reaction formula of methanol electrolysis is: anode CH3OH+H2O=6H + +CO2+6e; cathode 2H + +2e=H2; the total reaction is CH3OH+H2O=3H2+CO2. Electrolysis of methanol can not only utilize the hydrogen in methanol itself, but also obtain hydrogen from water, and the utilization rate of hydrogen is very high. Studies have shown that hydrogen production by electrolysis of methanol can significantly reduce energy consumption. At the same rate, the voltage of methanol electrolysis is only 1 / 3 of the voltage required for water electrolysis, and hydrogen can be produced with less energy consumption. The energy storage battery 2 can meet the energy consumption of the methanol electrolysis hydrogen production reactor 4, becoming a mobile hydrogen production and filling device, which can be used for hydrogen production in off-grid application scenarios.

[0051] Furthermore, the methanol tank 5 and the water tank 6 are installed side by side on the left panel in the chassis 1 and are located above the electrolytic methanol hydrogen production reactor 4. The methanol tank 5 and the water tank 6 have input ports, and the input ports of the methanol tank 5 and the water tank 6 both pass through the top panel of the chassis 1. The methanol tank 5 is used to hold methanol fuel, and the water tank 6 is used to hold pure water. The electrolytic methanol hydrogen production reactor 4 consumes methanol water raw materials during the hydrogen production process. Methanol is supplied to the electrolytic methanol hydrogen production reactor 4 through the methanol tank 5, and pure water is supplied to the electrolytic methanol hydrogen production reactor 4 through the water tank 6.

[0052] The hydrogen charging module includes a hydrogen charging pipeline 71 and a hydrogen charging connector (not shown in the figure). The hydrogen charging pipeline 71 of the hydrogen charging module is connected to the hydrogen outlet of the electrolytic methanol hydrogen production reactor 4. The hydrogen charging module is used to charge the hydrogen output from the electrolytic methanol hydrogen production reactor 4 into the hydrogen storage bottle 9. The gas cylinder warehouse 8 is installed on the right panel of the chassis 1 and is located above the energy storage battery 2. The gas cylinder warehouse 8 is connected to the hydrogen charging connector of the hydrogen charging module, and the hydrogen storage bottle 9 is plugged into the gas cylinder warehouse 8 in a detachable manner. When the hydrogen storage bottle 9 is inserted into the gas cylinder warehouse 8, the hydrogen charging connector connects the hydrogen charging module with the hydrogen storage bottle 9, and the hydrogen charging module can charge the hydrogen output from the electrolytic methanol hydrogen production reactor 4 into the hydrogen storage bottle 9.

[0053] In this embodiment, the energy storage battery 2 has an AC input terminal 21, a DC output terminal 22 and a first Type-C interface 23. The DC output terminal 22 is connected to the input terminal of the DC power supply 3 by a circuit. The AC input terminal 21 extends to the side wall of the chassis 1, that is, the AC input terminal 21 can be plugged in from the outside of the chassis 1 to charge the energy storage battery 2. The energy storage battery 2 can be charged with alternating current through the AC input terminal 21, and the energy storage battery 2 can output direct current to the electrolytic methanol hydrogen reactor 4 through the DC output terminal 22, which is highly practical.

[0054] In this embodiment, a hydrogen fuel cell 14 and a DCDC converter (not shown in the figure) are also included. The hydrogen fuel cell 14 is installed in the chassis 1. The hydrogen charging module is connected to the hydrogen inlet of the hydrogen fuel cell 14 through a hydrogen pipeline. The hydrogen fuel cell 14 and the DCDC converter are connected by circuits. The DCDC converter has a second Type-C interface, and the first Type-C interface 23 is connected to the second Type-C interface. A part of the hydrogen output by the electrolysis methanol hydrogen production reactor 4 is input into the hydrogen fuel cell 14 through the hydrogen charging module. The hydrogen fuel cell 14 generates electricity using hydrogen, and the electric energy is converted through the DCDC converter and input into the energy storage battery 2 to charge the energy storage battery 2. Then, the electric energy required for hydrogen production by the electrolysis methanol hydrogen production reactor 4 is supplied through the energy storage battery 2, which can significantly improve the battery life of the energy storage battery 2.

[0055] In this embodiment, a gas-water unit 101 and a drying unit 102 are also installed in the chassis 1. The gas-water unit 101 and the drying unit 102 are located in the middle of the chassis 1, roughly between the energy storage battery 2 and the DC power supply 3. The electrolysis methanol hydrogen production reactor 4, the gas-water unit 101, the drying unit 102 and the hydrogen charging module are connected in sequence. The hydrogen output by the electrolysis methanol hydrogen production reactor 4 contains a small amount of water. The gas-water separation is performed by the gas-water unit 101 and the drying unit 102 to remove the water in the hydrogen, so that the hydrogen input to the hydrogen storage bottle 9 is dry and pure hydrogen.

[0056] In this embodiment, the methanol tank 5 is connected to the electrolytic methanol hydrogen production reactor 4 through a methanol pipeline, and a methanol pump 51 is provided on the methanol pipeline. The water tank 6 is connected to the electrolytic methanol hydrogen production reactor 4 through a water pipe, and a water pump (not shown in the figure) is provided on the water pipe. The methanol pump 51 and the water pump can be used to respectively regulate the output methanol flow rate and pure water flow rate, and methanol and pure water are respectively input into the electrolytic methanol hydrogen production reactor 4 in a certain proportion to produce hydrogen.

[0057] In this embodiment, the hydrogen storage bottle 9 is a solid-state hydrogen storage bottle 9, and the hydrogen storage bottle 9 is filled with a hydrogen storage material. The solid-state hydrogen storage bottle 9 is safe and reliable, and is suitable for use in products such as hydrogen-powered bicycles and hydrogen-powered drones.

[0058] In this embodiment, the inlet end of the gas cylinder bin 8 extends out of the side wall of the chassis 1, and an outer cover 81 is provided at the inlet end of the gas cylinder bin 8. By opening the outer cover 81, the hydrogen storage bottle 9 can be inserted or pulled out from the gas cylinder bin 8 from the outside of the chassis 1, which is easy to operate.

[0059] In this embodiment, a plurality of heat dissipation holes 11 are evenly distributed on the side wall of the chassis 1, and a heat dissipation fan 12 is provided inside the chassis 1, and the heat dissipation fan 12 blows out the hot air in the chassis 1 through the heat dissipation holes 11. The hydrogen charging module, gas cylinder bin 8, hydrogen charging connector, gas-water unit 101 and drying unit 102 of the present application are all existing products that can be purchased on the market.

[0060] In this embodiment, a plurality of supporting plates 13 are also included, and the methanol electrolysis hydrogen production reactor 4 , the energy storage battery 2 , the methanol tank 5 and the water tank 6 are all fixed in the chassis 1 through the supporting plates 13 .

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. Off-grid methanol electrolysis hydrogen production and power supply integrated machine, characterized in that: include: Chassis (1); An energy storage battery (2) is arranged inside the chassis (1); A direct current power source (3) connected to the energy storage battery (2) by a circuit; A methanol electrolysis hydrogen production reactor (4) connected to the DC power supply (3) by means of an electric circuit; a methanol tank (5) and a water tank (6), wherein the methanol tank (5) supplies methanol to the electrolysis methanol hydrogen production reactor (4), and the water tank (6) supplies water to the electrolysis methanol hydrogen production reactor (4); A hydrogen charging module connected to the hydrogen outlet of the methanol electrolysis hydrogen production reactor (4); The gas cylinder warehouse (8) is connected to the hydrogen charging module by a hydrogen charging joint, and the hydrogen storage bottle (9) is plugged into the gas cylinder warehouse (8) in a detachable manner. The hydrogen charging module charges the hydrogen output by the electrolytic methanol hydrogen production reactor (4) into the hydrogen storage bottle (9).

2. The off-grid methanol electrolysis hydrogen production and power supply integrated machine according to claim 1 is characterized in that: The energy storage battery (2) has an AC input end (21), a DC output end (22) and a first Type-C interface (23), and the DC output end (22) is connected to the input end of the direct current power source (3) by means of a circuit.

3. The off-grid methanol electrolysis hydrogen production and power supply integrated machine according to claim 2 is characterized by: The AC input terminal (21) extends out from the side wall of the cabinet (1).

4. The off-grid methanol electrolysis hydrogen production and power supply integrated machine according to claim 2 is characterized by: It also includes a hydrogen fuel cell (14) and a DCDC converter, wherein the hydrogen fuel cell (14) is installed in the chassis (1), the hydrogen charging module is connected to the hydrogen inlet of the hydrogen fuel cell (14) via a hydrogen pipeline, the hydrogen fuel cell (14) and the DCDC converter are connected by circuit, the DCDC converter has a second Type-C interface, and the first Type-C interface (23) is connected to the second Type-C interface.

5. The off-grid methanol electrolysis hydrogen production and power supply integrated machine according to claim 1, characterized in that: It also includes a gas-water unit (101) and a drying unit (102), and the electrolysis methanol hydrogen production reactor (4), the gas-water unit (101), the drying unit (102) and the hydrogen charging module are connected in sequence.

6. The off-grid methanol electrolysis hydrogen production and power supply integrated machine according to claim 1, characterized in that: The methanol tank (5) is connected to the electrolytic methanol hydrogen production reactor (4) via a methanol pipeline, a methanol pump (51) is provided on the methanol pipeline, and the water tank (6) is connected to the electrolytic methanol hydrogen production reactor (4) via a water pipe, a water pump is provided on the water pipe.

7. The off-grid methanol electrolysis hydrogen production and power supply integrated machine according to claim 1, characterized in that: The hydrogen storage bottle (9) is a solid-state hydrogen storage bottle (9), and the hydrogen storage bottle (9) is filled with hydrogen storage material.

8. The off-grid methanol electrolysis hydrogen production and power supply integrated machine according to claim 1, characterized in that: The inlet end of the gas cylinder bin (8) protrudes onto the side wall of the chassis (1), and the inlet end of the gas cylinder bin (8) is provided with an outer cover (81).

9. The off-grid methanol electrolysis hydrogen production and power supply integrated machine according to claim 1, characterized in that: A plurality of heat dissipation holes (11) are evenly distributed on the side wall of the chassis (1), and a heat dissipation fan (12) is arranged inside the chassis (1).

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