Hydrogen supply subsystem insulation design structure for fuel cell

Abstract

The utility model discloses an insulation design structure of a hydrogen supply subsystem for a fuel cell, the hydrogen supply subsystem comprises a plate heat exchanger and an ejector, the plate heat exchanger is connected with the ejector through a connecting pipeline, the ejector and the plate heat exchanger are arranged on a galvanic pile end plate, and the ejector is connected with the plate heat exchanger through a connecting pipeline. The ejector and the plate heat exchanger are both made of metal materials, and a first insulating layer is arranged on the mounting surface when the ejector and the electric pile are mounted; and a second insulating layer is arranged on the mounting surface when the plate heat exchanger and the electric pile are mounted. According to the utility model, the insulating layers are arranged on the respective mounting surfaces of the ejector and the plate-type heat exchanger, so that the ejector and the plate-type heat exchanger can be directly mounted without adding an insulating pad during mounting or mounting the ejector and the plate-type heat exchanger on an insulating part and then mounting the ejector and the plate-type heat exchanger on an electric pile end plate. According to the invention, one part is reduced, one fastening assembly process is reduced, the cost is effectively reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel cells, and in particular relates to an insulating design structure of a hydrogen supply subsystem for a fuel cell. Background Art

[0002] Fuel cells mainly refer to hydrogen fuel cells that consume hydrogen to generate electricity. Hydrogen fuel cells catalyze reactions by supplying hydrogen and oxygen. The structure includes a hydrogen supply subsystem, which generally consists of a plate heat exchanger, an ejector, a water distributor, and connecting pipes. The ejector and the plate heat exchanger are generally installed on the metal end plate of the stack, connected by a stainless steel pipe in the middle. During the operation of the system, the electricity generated by the stack may be conducted to the ejector and the plate heat exchanger, and the electricity and hydrogen come into contact, bringing safety risks, while causing the insulation value of the system to decrease, causing the fuel cell system to fail and shut down.

[0003] In the prior art, an insulating pad is added at the installation point of the ejector, or the ejector is installed on an insulating component, and the insulating component is then connected to the stack end plate. This makes the installation more complicated and reduces the installation efficiency.

[0004] For example, the utility model with the authorization announcement number CN220929801U discloses an ejector for a fuel cell system, wherein one side of the ejector body 1 is a mounting surface, the output port 5 is located on the mounting surface, the mounting surface is provided with a fixing protrusion 19 for fixed connection, and the fixing protrusion 19 is provided with a fixing hole 20. The ejector is fixed to the fuel cell stack by bolts passing through the fixing hole 20. Utility Model Content

[0005] The utility model aims at the above-mentioned deficiencies in the prior art and provides an insulation design structure of a hydrogen supply subsystem for a fuel cell.

[0006] An insulation design structure of a hydrogen supply subsystem for a fuel cell, the hydrogen supply subsystem comprising a plate heat exchanger and an ejector, the plate heat exchanger and the ejector being connected via a connecting pipe, the ejector and the plate heat exchanger being mounted on an end plate of a fuel cell stack, the ejector and the plate heat exchanger being both made of metal, a first insulating layer being provided on a mounting surface of the ejector when mounted on the fuel cell stack, and a second insulating layer being provided on a mounting surface of the plate heat exchanger when mounted on the fuel cell stack.

[0007] Preferably, the first insulating layer and the second insulating layer are respectively attached to the mounting surfaces of the ejector and the plate heat exchanger through a molding process.

[0008] More preferably, the ejector has a plurality of first mounting feet protruding from the mounting surface to the side, the first mounting feet have a first mounting hole, and the first insulating layer wraps the inner side wall and both side end faces of the first mounting hole. The plate heat exchanger has a plurality of second mounting feet protruding from the mounting surface to the side, the second mounting feet have a second mounting hole, and the second insulating layer wraps the inner side wall and both side end faces of the second mounting hole.

[0009] Preferably, at least one section of the connecting pipeline is an insulating pipe, so that electrical conduction cannot be carried out between the plate heat exchanger and the ejector through the connecting pipeline.

[0010] More preferably, the connecting pipeline includes two sections of stainless steel pipes respectively connected to the plate heat exchanger and the ejector, and the ends of the two sections of stainless steel pipes are spaced a certain distance apart and connected via an insulating joint.

[0011] Preferably, the plate heat exchanger has a coolant inlet and a coolant outlet.

[0012] Preferably, the ejector has a hydrogen inlet, a hydrogen outlet, and a return hydrogen inlet for connecting to one end of the hydrogen return port of the fuel cell stack. When the hydrogen entering the hydrogen inlet flows in the ejector, the recycled hydrogen on the return hydrogen inlet side is ejected into the ejector and enters the fuel cell stack together from the hydrogen outlet.

[0013] The insulating design structure of the hydrogen supply subsystem for the fuel cell of the utility model provides an insulating layer on the respective mounting surfaces of the ejector and the plate heat exchanger, so that the ejector and the plate heat exchanger can be directly installed without adding an insulating pad during installation, or installing the ejector and the plate heat exchanger on an insulating component first, and then installing them with the stack end plate. The application reduces one component and one fastening assembly process, effectively reducing costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The three-dimensional structural schematic diagram of the insulation design structure of the hydrogen supply subsystem for the fuel cell of the utility model.

[0015] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the insulation design structure of the hydrogen supply subsystem for the fuel cell of the utility model.

[0016] Figure 3 This is a schematic diagram of the structure of the ejector.

[0017] Figure 4 for Figure 3 Cross-sectional view along AA direction.

[0018] Figure 5 It is a structural diagram of a plate heat exchanger.

[0019] Figure 6 for Figure 5 Cross-sectional view along direction BB.

[0020] Figure 7 A cross-sectional view of the connecting pipe.

[0021] Reference numerals:

[0022] Ejector 1, first insulating layer 11, first mounting foot 12, first mounting hole 13,

[0023] Plate heat exchanger 2, second insulating layer 21, second mounting foot 22, second mounting hole 23, coolant inlet 24, coolant outlet 25,

[0024] Connecting pipeline 3, insulating joint 31. DETAILED DESCRIPTION

[0025] like Figures 1 to 7 As shown, an insulation design structure of a hydrogen supply subsystem for a fuel cell, the hydrogen supply subsystem includes an ejector 1 and a plate heat exchanger 2, the plate heat exchanger 2 and the ejector 1 are connected by a connecting pipe 3, and the ejector 1 and the plate heat exchanger 2 are installed on the end plate of the fuel cell stack. The ejector 1 and the plate heat exchanger 2 are both made of metal.

[0026] A first insulating layer 11 is provided on the mounting surface of the ejector 1 when it is mounted on the stack, so that when the ejector 1 is mounted on the stack end plate, the ejector 1 and the stack are separated and insulated by the first insulating layer 11. The first insulating layer 11 is attached to the mounting surface of the ejector 1 by a plastic coating process.

[0027] like Figure 3 and Figure 4 As shown, the ejector 1 has a plurality of first mounting feet 12 protruding from the mounting surface to the side, the first mounting feet 12 have a first mounting hole 13, and the first insulating layer 11 wraps the inner side wall and both side end faces of the first mounting hole 13. In this way, when the ejector 1 is mounted on the stack end plate using bolts or screws, the bolts or screws contact the first insulating layer 11, and do not contact the inner side wall and both side end faces of the first mounting hole 13.

[0028] A second insulating layer 21 is provided on the mounting surface of the plate heat exchanger 2 when the plate heat exchanger 2 is mounted on the end plate of the stack, so that when the plate heat exchanger 2 is mounted on the stack end plate, the plate heat exchanger 2 and the stack are separated and insulated by the second insulating layer 21. The second insulating layer 21 is attached to the mounting surface of the plate heat exchanger 2 by a plastic coating process.

[0029] like Figure 5 and Figure 6As shown, the plate heat exchanger 2 has a plurality of second mounting feet 22 protruding from the mounting surface to the side, the second mounting feet 22 have second mounting holes 23 , and the second insulating layer 21 wraps the inner side walls and both side end surfaces of the second mounting holes 23 .

[0030] In the structure shown in the figure, the first insulating layer 11 on the ejector 1 is a continuous structure, including the first insulating layer 11 at each first mounting hole 13 is also connected to the main part of the first insulating layer 11. Through the arrangement of the first insulating layer 11, a certain gap is provided between the ejector 1 and the battery stack after installation, so that the two are not in direct contact.

[0031] The second insulating layer 21 on the plate heat exchanger 2 includes several separated parts, and the second insulating layer 21 is only provided at each second mounting hole 23. However, the provision of the second insulating layer 21 at each location allows a certain gap to exist between the plate heat exchanger 2 and the fuel cell stack after installation, so that the two are not in direct contact.

[0032] At least one section of the connecting pipeline 3 is an insulating pipe, so that the plate heat exchanger 2 and the ejector 1 cannot be electrically connected through the connecting pipeline 3. In a preferred embodiment, the connecting pipeline 3 includes two sections of stainless steel pipes respectively connected to the plate heat exchanger 2 and the ejector 1, and the ends of the two sections of stainless steel pipes are spaced a certain distance apart and connected through an insulating joint 31.

[0033] The ejector 1 has a hydrogen inlet, a hydrogen outlet, and a return hydrogen inlet for connecting to one end of the return hydrogen port of the fuel cell stack. When the hydrogen entering the hydrogen inlet flows in the ejector 1, the recycled hydrogen on the return hydrogen inlet side is ejected into the ejector 1 and enters the fuel cell stack from the hydrogen outlet together.

[0034] The recycled hydrogen comes out of the fuel cell stack at a high temperature, and is heat exchanged using a plate heat exchanger 2. After passing through the plate heat exchanger 2, the recycled hydrogen enters the hydrogen return inlet of the ejector 1 from the connecting pipe 3. The plate heat exchanger 2 has a coolant inlet 24 and a coolant outlet 25. The coolant enters the plate heat exchanger 2 from the coolant inlet 24 for heat exchange, and then exits from the coolant outlet 25.

Claims

1. An insulation design structure of a hydrogen supply subsystem for a fuel cell, wherein the hydrogen supply subsystem comprises a plate heat exchanger and an ejector, the plate heat exchanger and the ejector are connected via a connecting pipeline, and the ejector and the plate heat exchanger are mounted on an end plate of a fuel cell stack, characterized in that: The ejector and the plate heat exchanger are both made of metal. A first insulating layer is provided on the mounting surface of the ejector when it is mounted on the fuel cell stack; a second insulating layer is provided on the mounting surface of the plate heat exchanger when it is mounted on the fuel cell stack.

2. The insulation design structure of the hydrogen supply subsystem for a fuel cell according to claim 1, characterized in that: The first insulating layer and the second insulating layer are respectively attached to the installation surfaces of the ejector and the plate heat exchanger through a plastic coating process.

3. The insulation design structure of the hydrogen supply subsystem for a fuel cell according to claim 2, characterized in that: The ejector has a plurality of first mounting feet protruding from the mounting surface toward the side, the first mounting feet have a first mounting hole, and the first insulating layer wraps the inner side wall and both side end surfaces of the first mounting hole.

4. The insulation design structure of the hydrogen supply subsystem for a fuel cell according to claim 2, characterized in that: The plate heat exchanger has a plurality of second mounting feet protruding from the mounting surface toward the side, the second mounting feet have second mounting holes, and the second insulating layer wraps the inner side wall and both side end surfaces of the second mounting hole.

5. The insulation design structure of the hydrogen supply subsystem for a fuel cell according to claim 1, characterized in that: At least one section of the connecting pipeline is an insulating pipe, so that the plate heat exchanger and the ejector cannot be electrically conductive through the connecting pipeline.

6. The insulation design structure of the hydrogen supply subsystem for a fuel cell according to claim 5, characterized in that: The connecting pipeline includes two sections of stainless steel pipes respectively connected to the plate heat exchanger and the ejector. The ends of the two sections of stainless steel pipes are spaced a certain distance apart and connected via an insulating joint.

7. The insulation design structure of the hydrogen supply subsystem for a fuel cell according to claim 1, characterized in that: The plate heat exchanger has a coolant inlet and a coolant outlet.

8. The insulation design structure of the hydrogen supply subsystem for a fuel cell according to claim 1, characterized in that: The ejector has a hydrogen inlet, a hydrogen outlet, and a return hydrogen inlet for connecting to one end of the return hydrogen port of the fuel cell stack. When the hydrogen entering the hydrogen inlet flows in the ejector, the return hydrogen on the return hydrogen inlet side is ejected into the ejector and enters the fuel cell stack from the hydrogen outlet together.

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