CN219587845U - End cover with cooling groove and air compressor - Google Patents

Abstract

The utility model discloses an end cover with a cooling groove, which comprises a first through hole arranged at the center, wherein a closed groove surrounding the first through hole is arranged on the first surface of the end cover, an air inlet channel is further arranged in the end cover, the air inlet channel extends from the second surface to the groove and is communicated with the groove so as to form a cooling gas path, and cooling gas is guided to flow into the groove from the air inlet channel and flow along the groove. The end cover is applied to the air compressor, and can accurately guide cooling gas so as to sufficiently cool corresponding components.

Description

End cover with cooling groove and air compressor

Technical Field

The utility model relates to the technical field of new energy, in particular to an end cover with a cooling groove and a corresponding air compressor.

Background

A hydrogen fuel cell system is a device that converts chemical energy into electric energy by a chemical reaction of hydrogen and oxygen, which is actually a power generation process. The hydrogen fuel cell system has high power generation efficiency, no noise and no pollution, and is an environment-friendly power generation device, so that the hydrogen fuel cell system is widely applied to the technical fields of new energy automobiles and the like.

The hydrogen fuel cell system generally includes a stack, a hydrogen supply module, and an air supply module, wherein the stack is a core member of the hydrogen fuel cell system, is formed by stacking a plurality of unit cells in series, and determines the power level of the hydrogen fuel cell system. The hydrogen supply module provides a fuel source, and the hydrogen storage capacity of the hydrogen supply module determines the working time of the hydrogen fuel cell. The air supply module is used for providing clean air with sufficient pressure and flow for the fuel cell according to the output power of the electric pile so as to meet the oxygen demand of the fuel cell, and mainly comprises an air filter, an air compressor, a motor and an intercooler, wherein the air compressor is used for boosting the air so as to improve the power output of the hydrogen fuel cell system.

When the air compressor in the hydrogen fuel cell system works, the rotating speed of the main shaft can reach 100000r/min, and larger axial force can be generated, so that a large amount of heat can be generated in the air compressor, particularly in parts contacted with the main shaft, such as a thrust disc and the like, in the working process. If the heat cannot be discharged in time, heat accumulation can be formed, and the air compressor is forced to be protected and stopped due to the fact that the internal temperature is too high.

The thrust disc of the existing air compressor or expander is mainly cooled by heat radiation and heat transfer, so that the cooling effect at the center of the thrust disc, namely the contact position of the thrust disc with the thrust bearing and the main shaft, is poor, the temperature rise is higher, and the potential risk of damaging the surface coating of the thrust bearing exists.

Disclosure of Invention

In view of some or all of the problems in the prior art, a first aspect of the present utility model provides an end cap with a cooling slot, comprising:

a first through hole provided at a center of the end cover;

a slot disposed on the first surface of the end cap, the slot surrounding the closed shape of the first through hole; and

and an air inlet channel extending from the second surface of the end cover to the groove so as to be communicated with the groove to form an end cover internal air path, and guiding air to enter the groove through the air inlet channel.

Further, at least one sub-groove is arranged on the groove, and extends from the groove to the first through hole so as to guide gas to flow to the center of the end cover along the sub-groove; and/or

The closed shape includes: circular or quasi-circular or polygonal or irregular shapes concentric or eccentric with the first through hole.

Further, the dividing groove is a straight line groove or an arc groove.

Further, the air inlet channel comprises at least one air inlet and at least one air outlet, wherein the air inlet is arranged on the second surface of the end cover, and the air outlet is arranged in the groove.

Further, the depth of the groove is 1 to 5 millimeters; and/or

The width of the groove is 1 to 5 mm.

Based on the end cover, the second aspect of the utility model provides an air compressor, comprising a motor, wherein the motor comprises:

a housing provided with a second through hole communicating with an external cooling gas supply device so that the cooling gas enters the inside of the motor;

the end cover is arranged at the first end of the shell, a gap exists between the second surface of the end cover and the internal structure of the motor, a motor side cooling gas path is formed, and the cooling gas is guided to reach the air inlet hole of the end cover from the second through hole;

the first end of the rotor extends out through the first through hole of the end cover, and a first thrust bearing, a thrust disc and a second thrust bearing are sequentially arranged on the rotor from the end cover outwards; and

and a stator fixed to the inside of the housing, the center axis of the stator being coincident with the center axis of the rotor.

Further, the air compressor further comprises a bottom plate, wherein the bottom plate is arranged on the rotor and located on the outer side of the second thrust bearing, a cooling space is formed between the bottom plate and the end cover, and a gap is formed between the bottom plate and the rotor to form a cooling space air outlet.

Further, the air compressor further comprises an impeller which is arranged on the rotor and is positioned outside the bottom plate.

Further, the air compressor further comprises a pressing shell which is pressed and connected to one side, far away from the motor, of the impeller through a nut.

Further, the first thrust bearing and the second thrust bearing are foil type dynamic pressure air bearing, and a cooling gas path in a cooling space is formed by the internal structure of the foil type dynamic pressure air bearing and a gap between the foil type dynamic pressure air bearing and the rotor.

Further, the foil dynamic pressure air bearing includes:

a flat foil disposed adjacent to the thrust plate with a gap therebetween;

the wave foil is arranged between the bottom plate and the flat foil, and gaps are reserved between the wave foil and the bottom plate and between the wave foil and the flat foil; and

a bottom plate.

According to the end cover with the cooling groove and the air compressor, through structural optimization of the end cover and other parts, a multi-section cooling gas path is formed, cooling gas is precisely guided to flow through the thrust disc and the thrust bearing surface so as to sufficiently cool the thrust disc and the thrust bearing, further, the temperature rise of the thrust disc and the thrust bearing is effectively reduced, the temperature of the thrust disc and the thrust bearing can be ensured to be maintained at an allowable temperature for safe operation, and the reliability and the service life of a system are improved.

Drawings

To further clarify the above and other advantages and features of embodiments of the present utility model, a more particular description of embodiments of the utility model will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the utility model and are therefore not to be considered limiting of its scope. In the drawings, for clarity, the same or corresponding parts will be designated by the same or similar reference numerals.

FIG. 1 shows a schematic structural view of an end cap with cooling slots according to one embodiment of the present utility model;

fig. 2 illustrates a schematic structural view of an air compressor according to an embodiment of the present utility model; and

fig. 3 shows a schematic structural view of a thrust bearing according to an embodiment of the present utility model.

Detailed Description

The utility model is further elucidated below in connection with the embodiments with reference to the drawings. It should be noted that the components in the figures may be shown exaggerated for illustrative purposes and are not necessarily to scale. In the drawings, identical or functionally identical components are provided with the same reference numerals.

In the present utility model, unless specifically indicated otherwise, "disposed on …", "disposed over …" and "disposed over …" do not preclude the presence of an intermediate therebetween. Furthermore, "disposed on or above" … merely indicates the relative positional relationship between the two components, but may also be converted to "disposed under or below" …, and vice versa, under certain circumstances, such as after reversing the product direction.

In the present utility model, the embodiments are merely intended to illustrate the scheme of the present utility model, and should not be construed as limiting.

In the present utility model, the adjectives "a" and "an" do not exclude a scenario of a plurality of elements, unless specifically indicated.

It should also be noted herein that in embodiments of the present utility model, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that the components or assemblies may be added as needed for a particular scenario under the teachings of the present utility model.

It should also be noted herein that, within the scope of the present utility model, the terms "identical", "equal" and the like do not mean that the two values are absolutely equal, but rather allow for some reasonable error, that is, the terms also encompass "substantially identical", "substantially equal". By analogy, in the present utility model, the term "perpendicular", "parallel" and the like in the table direction also covers the meaning of "substantially perpendicular", "substantially parallel".

In order to solve the problems that in the prior art, the cooling effect of the contact part of the thrust disc and the thrust bearing is poor, and the potential risk that the surface coating of the thrust bearing is damaged exists, the structure of the end cover and other parts is optimized to form a multi-section cooling gas path, the cooling gas is accurately guided to flow through the surfaces of the thrust disc and the thrust bearing so as to fully cool the thrust disc and the thrust bearing, the temperature rise of the thrust disc and the thrust bearing is effectively reduced, and the temperature of the thrust disc and the thrust bearing can be ensured to be maintained to safely run at the allowable temperature.

In the present utility model, the first surface of the end cover means a surface of a side facing away from the inside of the motor when mounted, and the second surface means a surface of a side opposite thereto, i.e., a surface of a side near the impeller.

In the present utility model, "the groove guides the cooling air to the vicinity of the first through hole" means that the end of the groove is close to or in communication with the first through hole, wherein "close to" means that the distance between the end and the first through hole is less than 30%, preferably less than 20%, more preferably less than 10%, most preferably less than 5% of the end cap dimension (e.g., its radius).

The utility model is further elucidated below in connection with the embodiments with reference to the drawings.

Fig. 1 shows a schematic structural view of an end cap with a cooling channel according to an embodiment of the present utility model. As shown in fig. 1, an end cap having a cooling groove is provided at the center thereof with a first through hole 101, and a first surface 001 is provided with a groove 121, and an intake passage 103 communicating with the groove.

The grooves 121 serve to guide the flow of gas. As shown in fig. 2, in the embodiment of the present utility model, the key of sufficiently cooling the thrust disk 203 and the thrust bearings 202 and 204 is to guide the cooling gas to the gap between the motor side thrust bearing 202 and the rotor 213, so that the cooling gas can flow through the motor side thrust bearing 202 and the side surface of the thrust disk 203 contacting with the motor side thrust bearing 202 in the radial direction from the center of the motor side thrust bearing 202 under the action of pressure, and after the cooling gas passes over the thrust disk 203, the cooling gas continues to flow through the impeller side thrust bearing 204 and the side surface of the thrust disk 203 contacting with the impeller side thrust bearing 204 in the radial direction from the edge of the impeller side thrust bearing 204 under the action of pressure, thereby achieving sufficient cooling of the thrust disk 203 and the two side thrust bearings 202 and 204. Based on this, in one embodiment of the present utility model, the slot 121 is a closed shape surrounding the first through hole, for example, a circle or a quasi-circle or a polygon concentric with the first through hole, and the air outlet of the air inlet channel 103 is disposed in the slot 121. In order to better guide the cooling gas to the center of the end cover, in one embodiment of the present utility model, at least one sub-groove 122 is provided on the groove 121, and the sub-groove 122 extends from the groove 121 toward the first through hole 101 to guide the gas to flow along the sub-groove 122 toward the center of the end cover. In the embodiment of the present utility model, the dividing grooves 122 are radially arranged around the first through hole, and a straight line groove or an arc groove may be used.

In order to ensure a cooling effect, in one embodiment of the utility model, the depth of the groove is preferably 1 to 5 mm. In a further embodiment of the utility model, the width of the groove is preferably 1 to 5 mm. It should be understood that in other embodiments of the present utility model, the depth, width, distance from the first through hole, and other dimensional information of the slot may be designed according to a specific working condition.

In an embodiment of the utility model, the air inlet channel 103 extends from the second surface of the end cap towards the slot and communicates with the slot. That is, the air inlet of the air inlet channel 103 is arranged on the second surface of the end cover, and the air outlet is arranged in the groove. In one embodiment of the utility model, the air inlet channel 103 is a linear channel and is disposed perpendicular to the second surface of the end cap. It should be understood that in other embodiments of the present utility model, the air inlet channel may not be a linear channel, but includes a plurality of air inlets and a plurality of air outlets, where the air inlets are disposed on the second surface of the end cover, each air outlet is disposed in the main groove, and the number of air inlets may be equal to or different from the number of air outlets, and the air inlets and the air outlets are communicated through a linear pipeline, or a pipeline with a bending portion, an arc segment, and when the air inlet and the air outlet are linear, they may form an angle with the second surface of the end cover, for example, 15 °, 30 °, 45 °, 60 ° or the like.

Fig. 2 shows a schematic structural diagram of an air compressor according to an embodiment of the present utility model based on the end caps as described above. As shown in fig. 2, an air compressor includes a motor 201, a first thrust bearing 202, a thrust disk 203, a second thrust bearing 204, a bottom plate 205, an impeller 206, and a press housing 207.

The motor 201 includes a housing 211, an end cap 212, a rotor 213, and a stator 214. Wherein the housing 211 is provided with a second through hole 2111, and the second through hole 2111 communicates with an external cooling gas supply device (not shown) to introduce cooling gas into the inside of the motor. As shown in the drawing, a certain gap exists between the stator 214 and the housing 211 in the interior of the motor, so that the cooling gas can be cooled to a certain degree after entering the interior of the motor through the second through holes 2111. The end cap 212 is of the end cap construction described above. The end cap 212 is disposed at a first end of the housing 211. As shown in fig. 1, a gap exists between the second surface of the end cover 212 and the internal structure of the motor, such as the end surface of the stator, so as to further form a motor side cooling gas path, so that the cooling gas flows from the second surface of the end cover into the air inlet channel of the end cover along the gap after entering the interior of the motor from the second through hole, reaches the groove of the first surface, and flows to the center of the first surface of the end cover along the groove. The first end of the rotor 213 protrudes through the first through hole of the end cover, and the first thrust bearing 202, the thrust disk 203, the second thrust bearing 204, the bottom plate 205, and the impeller 206 are sequentially disposed on the rotor 213 from the first surface side of the end cover along the axial direction. The stator 214 is fixed to the inside of the housing with its center axis coincident with the center axis of the rotor.

As shown, a cooling space is formed between the base plate 205 and the end cap 212 to cool the thrust bearing and thrust disk. Wherein, a gap exists between the bottom plate 205 and the rotor 213, which forms an air outlet of the cooling space, and the cooling air flows out through the air outlet and then enters the pressure shell 207 through the back surface of the impeller 206.

In one embodiment of the utility model, the press housing 207 is crimped to the side of the impeller 206 remote from the motor by a nut 208.

In consideration of the cleaning requirement, in one embodiment of the utility model, air bearings are used in the air compressor. The first thrust bearing 202 and the second thrust bearing 204 preferably adopt foil dynamic pressure air bearing, the internal structure of the foil dynamic pressure air bearing and the gap between the foil dynamic pressure air bearing and the rotor form a cooling gas channel in a cooling space, and the cooling gas can sufficiently cool the thrust bearing and the thrust disc along the cooling gas channel in the cooling space under the action of pressure.

Fig. 3 shows a schematic structural view of a thrust bearing according to an embodiment of the present utility model. As shown in fig. 3, the foil-type hydrodynamic air bearing includes a flat foil 301, a corrugated foil 302, and a bottom plate 303. Wherein the flat foil 301 is arranged close to the thrust disc with a gap between the flat foil 301 and the thrust disc, and the corrugated foil 302 is arranged between the bottom plate 303 and the flat foil 301 with a gap between the corrugated foil and the bottom plate and the flat foil. This allows the cooling gas to pass through the slots in the first surface of the end cover to the center of the end cover and then split into three paths for cooling the first thrust bearing 202 and the motor side of the thrust disk. The first path flows through the gap between the corrugated foil and the bottom plate, the second path flows through the gap between the corrugated foil and the flat foil, and the third path flows through the gap between the flat foil and the thrust disc. The three paths of air flows gather at the outer side of the cooling space, flow from the edge of the second thrust bearing to the center after passing through the thrust disk so as to cool the second thrust bearing and the impeller side of the thrust disk, and the cooling air is divided into three paths here as well, wherein the first path flows through a gap between the flat foil and the thrust disk, the second path flows through a gap between the corrugated foil and the flat foil, and the third path flows through a gap between the corrugated foil and the bottom plate, and finally the three paths of air flows are gathered and discharged to the press shell through an air outlet of the cooling space, namely, a gap between the bottom plate and the rotor.

Compared with the prior art, the air compressor structure can reduce the temperature of the thrust disc by 30 ℃, so that the temperature of the thrust disc and the temperature of the thrust bearing are in a normal allowable temperature range, and the surface coating of the thrust bearing is hardly damaged.

While various embodiments of the present utility model have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to those skilled in the relevant art that various combinations, modifications, and variations can be made therein without departing from the spirit and scope of the utility model. Thus, the breadth and scope of the present utility model as disclosed herein should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.

Claims (9)

1. An end cap having a cooling slot, comprising:

the first through hole is arranged at the center of the end cover;

a groove provided on the first surface of the end cap, the groove having a closed shape surrounding the first through hole; and

and an air inlet channel extending from a second surface of the end cover opposite to the first surface to the groove so as to be communicated with the groove to form an end cover internal air passage, so that the air can reach the vicinity of the first through hole through the end cover air passage.

2. The end cap of claim 1, wherein at least one partial groove is provided in the groove, the partial groove extending from the groove toward the first through hole to guide gas along the partial groove toward a center of the end cap; and/or

The closed shape includes: a circle or polygon concentric or eccentric with the first through hole.

3. The end cap of claim 2, wherein the score slot is a straight slot or an arcuate slot.

4. The end cap of claim 1, wherein the air inlet channel comprises at least one air inlet and at least one air outlet, wherein the air inlet is disposed on the second surface of the end cap and the air outlet is disposed in the slot.

5. The end cap of claim 1, wherein the groove has a depth of 1 to 5 millimeters; and/or

The width of the groove is 1 to 5 mm.

6. An air compressor comprising a motor, wherein the motor comprises:

a housing provided with a second through hole communicating with an external cooling gas supply device so that the cooling gas enters the inside of the motor;

the end cover according to any one of claims 1 to 5, which is disposed at a first end of the housing, and has a gap between a second surface of the end cover and an internal structure of the motor, so as to form a motor-side cooling gas path, and guide the cooling gas from the second through hole to an air inlet hole of the end cover;

the first end of the rotor extends out through the first through hole of the end cover, and a first thrust bearing, a thrust disc and a second thrust bearing are sequentially arranged on the rotor from the first surface side of the end cover along the axial direction; and

and a stator fixed to the inside of the housing, the center axis of the stator being coincident with the center axis of the rotor.

7. The air compressor of claim 6, further comprising:

the bottom plate is arranged on the rotor, is positioned outside the second thrust bearing, forms a cooling space with the end cover, and forms a cooling space air outlet with the rotor through a gap between the bottom plate and the rotor;

an impeller which is arranged on the rotor and is positioned outside the bottom plate; and

and the pressing shell is pressed and connected to one side of the impeller, which is far away from the motor, through nuts, and is communicated with the cooling space through gaps among the bottom plate, the rotor and the impeller.

8. The air compressor of claim 7, wherein the first thrust bearing and the second thrust bearing are foil dynamic pressure air bearing, and the internal structure of the foil dynamic pressure air bearing and the gap between the foil dynamic pressure air bearing and the rotor form a cooling gas path in the cooling space.

9. The air compressor of claim 8, wherein the foil dynamic pressure air bearing comprises:

a flat foil disposed adjacent to the thrust plate with a gap therebetween;

the wave foil is arranged between the bottom plate and the flat foil, and gaps are reserved between the wave foil and the bottom plate and between the wave foil and the flat foil; and

a bottom plate.