CN217740578U - Separator and fuel cell anode gas circulating fan - Google Patents

Abstract

The utility model provides a separator and a fuel cell anode gas circulating fan. Wherein, the spacer is used inside the gas circulation fan, and the gas circulation fan has a casing (7) and front and rear end covers (5, 12) located at both ends of the casing (7). Including: an isolation plate (162) and an isolation cylinder (161), the isolation plate (162) has a first surface (162a) and a second surface (162b) opposite to each other, the second surface (162b) can abut and fixed on the front end cover (5), the isolation cylinder (161) protrudes from the first surface (162a) along the axial direction (X), and has an open end capable of Air-tightly cooperates with the rear end cover (12) to define a rotor chamber (B) inside the spacer barrel (161), which adopts the strength of the rear end cover (12) materials with different thermal conductivity.

Description

Separator and fuel cell anode gas circulation fan

technical field

The utility model relates to the field of fuel cells, in particular to a fuel cell anode gas circulation blower for supplying anode gas to the anode of the fuel cell and a spacer for the blower.

Background technique

Fuel cell system refers to a power generation system with fuel cell as the core, composed of fuel cell, fuel supply and circulation system, oxidant supply system, water/heat management system, control system, etc., among which the circulation fan is an indispensable part of the fuel cell system. A part of the fuel cell, which is used to transport the unreacted anode gas recovered by the fuel cell to the anode of the fuel cell. Circulation fans generally include an electric motor, the stator of which is energized to rotate a rotor and a motor shaft coupled to an impeller to drive the anode gas flow. Since the anode gas generally contains hydrogen and is prone to explosion when mixed with oxygen, it is necessary to prevent the anode gas from leaking into the stator cavity to ensure the safety of the fan itself, and to prevent the anode gas from leaking to the outside of the fan to ensure the safety of the entire battery system. For this reason, an isolation cover can be provided in the blower to prevent the anode gas from leaking to the stator cavity and the outside of the blower. However, the inventors of the present utility model have found that the isolation cover, especially the isolation cover made of plastic material, may be deformed due to contact with high-voltage anode gas, so that it cannot effectively isolate the anode gas, resulting in leakage of the anode gas. The safety of itself and the entire battery system poses a threat; in addition, due to the poor thermal conductivity of non-metallic materials, the part of the motor bearing close to the isolation cover is difficult to dissipate heat in time, which easily makes the bearing temperature too high and affects the overall performance of the motor.

Therefore, in this field, there is an urgent need for a technical solution that has a simple structure and can reliably isolate the anode gas to ensure the safety of the fan itself and the entire battery system.

Utility model content

In order to solve the above-mentioned problems in the prior art, the utility model provides a spacer and a fuel cell anode gas circulation fan.

The spacer disclosed in the present application is used inside a gas circulation fan, and the gas circulation fan has a casing and front and rear end covers located at two ends of the casing. The spacers include:

An isolation plate and an isolation cylinder, the isolation plate has a first surface and a second surface opposite to each other, the second surface can abut and be fixed on the front end cover, and the isolation cylinder moves along the axial direction X from The first surface is protruding and has an open end capable of airtightly fitting with the rear end cover to define a rotor chamber inside the isolation cylinder, and the isolation cylinder adopts the The strength and thermal conductivity of the rear end cap are different from the material.

In a feasible implementation manner, the open end can receive a protrusion formed by the rear end cover extending in the axial direction X and fit it airtightly, thereby defining a rotor chamber inside the isolation cylinder.

In a feasible embodiment, the open end and/or the rear end cap are provided with positioning features for positioning the sealing unit.

In a feasible implementation manner, the sealing unit is a sealing ring, and the sealing ring is clamped between the protrusion and the open end.

In a feasible implementation manner, the protrusion defines an accommodating cavity coaxial with the isolation cylinder in the axial direction X, for receiving the radial bearing of the rotor, so that the radial bearing is positioned at the position of the rotor lumen but not in contact with the open end.

In a feasible implementation manner, the isolation cylinder and the isolation plate are made of polyether ether ketone.

In a feasible implementation manner, the rear end cover is made of aluminum or aluminum alloy.

In a feasible implementation manner, the isolation cylinder is integrally formed with the isolation plate.

In a feasible implementation manner, the isolation plate is provided with a through hole in the axial direction to allow fasteners to pass through, and the isolation plate is fixed to the front end cover through the fasteners.

The application also discloses a fuel cell anode gas circulation fan, which includes a housing, a pump head, and a motor arranged in the housing, the motor is used to drive the anode gas in the pump head, the The fuel cell anode gas circulation blower also includes the spacer as described above, the spacer is positioned in the housing, wherein,

The rotor cavity of the isolation cylinder is used to accommodate the rotor and the motor shaft of the motor;

A stator cavity for accommodating a stator of the motor is formed between the isolation cylinder and the housing;

The isolation plate and the front end cover are positioned between the stator cavity and the pump head such that the pump head is not in communication with the stator cavity.

The utility model can be embodied as the schematic embodiments in the accompanying drawings. However, it should be noted that the drawings are only schematic, and any conceivable changes under the teaching of the utility model should be regarded as included in the scope of the utility model.

Description of drawings

The accompanying drawings show exemplary embodiments of the invention. These drawings should not be interpreted as necessarily limiting the scope of the present invention, wherein:

Fig. 1 is a schematic cross-sectional view of a fuel cell anode gas circulation fan according to the utility model.

Detailed ways

Further features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings. Exemplary embodiments of the present invention are shown in the drawings and are not necessarily drawn to scale. However, this invention may be embodied in many different forms and should not be construed as necessarily limited to the exemplary embodiments disclosed herein. On the contrary, these exemplary embodiments are only provided for explaining the present invention and conveying the spirit and substance of the present invention to those skilled in the art.

The utility model aims to propose an improved spacer for isolating the stator and rotor of a motor of a fuel cell anode gas circulation fan and a fuel cell anode gas circulation fan using the spacer. The isolation assembly generally includes an isolation plate and an isolation cylinder. Through the cooperation of the isolation piece and the front and rear end covers of the gas circulation fan, it can not only effectively isolate the stator and rotor of the motor, so as to prevent the anode gas of the fuel cell from entering the energized stator cavity, but also It can effectively prevent the bearing of the motor from being in a working environment with poor heat dissipation for a long time due to the poor thermal conductivity of the spacer, thereby affecting the overall performance of the system. Therefore, the separator according to the utility model can not only improve the safety of the fuel cell anode gas circulation blower itself, but also significantly improve the safety of the entire fuel cell system.

Optional but non-limiting embodiments of the isolation assembly and the fuel cell anode gas circulation blower according to the present invention are described below with reference to various drawings. In the drawings, the axial direction is shown by a dotted line X, which can be understood as the direction in which the rotation axis of the rotor of the electric motor is located. Therefore, in this paper, the radial direction refers to the direction where the diameter or radius of any circle whose center falls on the above-mentioned rotation axis is located, and the circumferential direction refers to the direction where the circumference of any circle whose center falls on the above-mentioned rotation axis is located. . However, it should be pointed out that the introduction of these orientation terms is only intended to more intuitively describe the relative orientation of each component in conjunction with the drawings, rather than limiting the absolute orientation of each component. Therefore, these orientation terms should not be interpreted in any way as being Restrictions on the scope of protection of the present utility model.

Referring to FIG. 1 , it shows a schematic cross-sectional view of a fuel cell anode gas circulation fan according to the present invention. As shown in FIG. 1 , the fuel cell anode gas circulation fan generally includes a motor, a pump head 1 and a housing 7 for accommodating the motor, wherein the motor drives the impeller 2 in the pump head 1 to rotate under the electric drive from the inverter drive 13 , and the impeller 2 in the pump head 1 can drive the anode gas to deliver it to the anode of the fuel cell while rotating, and the above-mentioned various components can be accommodated in the housing 7 or attached to the housing 7 .

The motor includes a stator 8 receiving power from an inverter drive 13, a rotor 9 that rotates when the stator 8 is energized, and a motor shaft 3 fixed to the rotor 9, wherein the motor shaft 3 is coupled to the impeller 2 in the pump head 1 so as to drive the impeller 2 rotate. The housing 7 defines inside it a stator chamber A for accommodating the stator 8 and a rotor chamber B for accommodating the rotor 9 . As shown in Figure 1, the stator chamber A is located radially outside the rotor chamber B, and the motor shaft 3 extends through the opening of the rotor chamber B into the pump head 1 and is coupled to the impeller 2, which is located on the moving path of the anode gas . For a high-power fuel cell system, the pressure of the anode gas is often relatively high, that is to say, there is a high-pressure anode gas in the pump head 1 .

Since the rotor 9 and the motor shaft 3 are moving parts and there are tolerances in manufacturing and processing, it is difficult to completely prevent the anode gas in the pump head 1 from entering the rotor chamber B. The anode gas contains hydrogen, which may explode when mixed with oxygen and encounters an electric spark or an increase in temperature. Therefore, in order to prevent the anode gas in the rotor chamber B from leaking into the stator chamber A, the fuel cell anode gas circulation fan of the present application designs a spacer 16, which is positioned or fixed in the casing 7 and configured as Cooperate with the end cover to isolate the stator cavity A from the rotor cavity B and the pump head 1. Specifically, the spacer 16 generally includes a spacer 161 and a spacer plate 162, wherein the spacer 16 cooperates with the front end cover 5 and the rear end cover 12 to seal the stator cavity A so that the stator cavity A is separated from the rotor cavity B. It is isolated from the pump head 1, so as to prevent the anode gas in the rotor chamber B and the pump head 1 from leaking into the stator chamber A.

In this specific embodiment, the spacer 16 is generally T-shaped, and has a spacer 162 and a spacer 161 . The isolation plate 162 has a first surface 162 a facing the stator cavity A and a second surface 162 b facing the pump head 1 , spaced apart along the axial direction X and opposite to each other. As shown in the figure, the second surface 162b of the isolation plate 162 abuts against the front cover 5 and is fixed by fasteners (not shown). It is positioned between the stator cavity A and the pump head 1 to isolate the stator cavity A and the pump head 1 from each other, thereby preventing the anode gas in the pump head 1 from leaking into the stator cavity A and ensuring the safety of the fan itself. The isolation cylinder 161 extends along the axial direction X from the first surface 162 a of the isolation plate 162 to a direction away from the isolation plate 162 . Therefore, the isolation cylinder 161 has a proximal end 161a close to the isolation plate 162, an open end 161b away from the isolation plate 162, and a hollow cylinder 161c extending between the proximal end 161a and the end 161b. This end 161b fits airtightly with the raised portion of the rear end cover 12 and defines the rotor cavity B inside. The rotor cavity B is used to accommodate the rotor 9 and the motor shaft 3 , and the stator cavity A is formed between the cylinder body 161 c , the front end cover 5 , the rear end cover 12 and the housing 7 . That is, the stator cavity A and the rotor cavity B are airtightly isolated from each other through the cooperation of the spacer and the front and rear end covers (and the use of O-rings 6, 11, 15, 18 in the figure), and the stator cavity is guaranteed Chamber A and rotor chamber B each have their own airtightness. Therefore, the anode gas in the rotor cavity B is prevented from leaking into the stator cavity A, and the safety of the fan itself is ensured.

In a preferred embodiment of the present invention, in order to insulate the stator cavity A from the rotor cavity B and the pump head 1, the spacer 16 can be integrally formed by an insulating material such as plastic, for example, the spacer 6 It can be made of polyether ether ketone (PEEK), so that the spacer 6 not only has good insulation and light weight, but also has high wear resistance and mechanical strength, and is easy to process and has small tolerances.

As shown in the figure, the rear end cover 12 is provided with an accommodating cavity coaxial with the isolation cylinder 161 in the axial direction X, for receiving the radial bearing 10 of the rotor 9, and the radial bearing 10 is installed on the shaft through a spring 14. It is accommodated in the cavity, but does not come into direct contact with the open end 161b. This design greatly facilitates the heat dissipation of the radial bearing. In order to more reliably locate the spacer 16 and ensure the stability of the system, the front end cover 5 and the rear end cover 12 are made of metal materials, such as aluminum or aluminum alloy, so that the front and rear end covers are stronger than the spacer 16 materials. High, better thermal conductivity, so that it has excellent thermal conductivity and high mechanical strength in the high temperature area close to the radial bearing 10, which is not only conducive to system heat dissipation, but also ensures that the cavity is not easy to deform due to high temperature and cause leakage. gas.

The combined use of two different materials improves the overall stability and heat dissipation effect of the fan.

The optional but non-limiting embodiments of the isolation assembly and the fuel cell anode gas circulation blower according to the present invention have been described in detail above with the aid of the accompanying drawings. For those of ordinary skill in the art, without departing from the spirit and essence of the present disclosure, modifications and supplements to techniques and structures, and recombinations of features in each embodiment should be considered as including Within the scope of the present utility model. Therefore, the modifications and supplements that can be conceived under the teaching of the present invention should be regarded as a part of the present invention. The scope of the utility model includes the known equivalent technology and the unforeseen equivalent technology at the filing date of the utility model.

Claims (10)

1. A partition for use inside a gas circulation fan having a casing (7) and front and rear end covers (5, 12) at both ends of the casing (7), characterized in that it comprises:

-a separator plate (162) and-a separator cylinder (161), the separator plate (162) having a first surface (162 a) and a second surface (162B) opposite to each other, the second surface (162B) being able to abut and be fixed on the front end cover (5), the separator cylinder (161) projecting from the first surface (162 a) along an axial direction (X) and having an open end able to cooperate hermetically with the rear end cover (12) to define a rotor chamber (B) inside the separator cylinder (161), the separator cylinder (161) being made of a material having a different strength and thermal conductivity from the rear end cover (12).

2. Partition according to claim 1, characterized in that said open extremity is able to receive and hermetically cooperate with a projection formed by the extension of said rear end cover (12) in the axial direction (X), thereby defining said rotor chamber (B) inside said insulating cylinder (161).

3. Spacer according to claim 2, wherein the open end and/or the rear end cap (12) is provided with positioning features for positioning a sealing unit.

4. A spacer as claimed in claim 3, wherein the sealing unit is a sealing ring which is clamped between the protrusion and the open end.

5. Partition according to claim 2, characterized in that the projection opens in an axial direction (X) with a housing cavity coaxial with the insulating cylinder for receiving a radial bearing (10) of a rotor, so that the radial bearing (10) is located in the rotor cavity (B) but not in contact with the open end.

6. Partition according to claim 1, characterized in that the insulation cylinder (161) and the insulation plate (162) are made of polyetheretherketone.

7. -partition according to claim 1, characterised in that the rear end cap (12) is made of aluminium or an aluminium alloy.

8. The spacer of claim 1, wherein the spacer cylinder (161) is integrally formed with the spacer plate (162).

9. The spacer as claimed in claim 1, wherein the spacer plate (162) is provided with a through hole in an axial direction for allowing a fastening member to pass therethrough, and the spacer plate is fixed to the front end cover by the fastening member.

10. Fuel cell anode gas circulator comprising a housing (7), a pump head (1), and an electric motor arranged in said housing (7) for driving anode gas in said pump head (1), characterised in that said fuel cell anode gas circulator further comprises a spacer according to any of claims 1-9, said spacer being positioned in said housing (7), wherein,

the rotor cavity (B) of the insulating cylinder (161) is used for accommodating a rotor (9) and a motor shaft of the motor;

a stator cavity (A) for accommodating a stator (8) of the motor is formed between the isolation cylinder (161) and the shell (7);

the separator plate (162) and the front end cover (5) are positioned between the stator cavity (A) and the pump head (1) and do not communicate the pump head (1) with the stator cavity (A).

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