CN213817455U

CN213817455U - Electric air compressor

Info

Publication number: CN213817455U
Application number: CN202023196683.2U
Authority: CN
Inventors: 刘质冰
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-07-27
Anticipated expiration: 2030-12-25

Abstract

The application discloses electric air compressor machine has the inner space who is prescribed a limit to by casing (100), casing (100) inside sets up water jacket (200), stator (300) and rotor (400), stator (300) centers on rotor (400) sets up, water jacket (200) fixed set up in inside casing (100), and have the passageway that allows the fluid to pass through and the holding cavity (210) of stator (300), stator (300) have stator core (310), the internal peripheral surface of cavity (210) with be provided with the restriction between the outer peripheral surface of stator core (310) water jacket (200) with stator (300) are in produce at least one spacing unit (500) of relative displacement when electric air compressor machine operates. According to the utility model discloses can realize the assembly between stator core and the water jacket with lower cost and nimble simple technology.

Description

Electric air compressor

Technical Field

The application relates to electric air compressor machine technical field especially relates to the inside assembly structure of electric air compressor machine.

Background

Referring to fig. 1, in the prior art, an interference fit is generally adopted between a stator core 1 and a water jacket 2 of an Electric Air Compressor (EAC). In practice, however, the size of the interference fit is difficult to grasp. It is known that when the electric air compressor is operated at a high speed, a large amount of heat is generated from internal components. Since the water jacket 2 and the stator core 1 are made of different materials, the expansion amounts thereof after heat generation are different from each other. On the one hand, if the interference magnitude between the two is too small, the components are easy to be dislocated and loosened during operation, and then vibration is caused during operation, so that the performance of the electric air compressor is influenced. On the other hand, if the interference between the water jacket 2 and the stator core 1 is too large, difficulty may be caused in assembly: if press-in type assembly is adopted, because the interference magnitude is large, great force needs to be applied when the stator assembly is pressed into the water jacket 2, and particles influencing the cleanliness of the system are easily generated in the process; and if the hot-sleeve type assembly is adopted, the high temperature during the assembly easily causes the water jacket 2 to generate deformation which is difficult to control, the process precision is influenced, and the cost is also increased.

Therefore, how to solve the difficult problem of assembling between the stator core 1 and the water jacket 2 in a low-cost and simple manner is a problem to be solved by the present application.

Disclosure of Invention

The application discloses be used for electric air compressor machine, it can solve the problem mentioned in the background art.

The application discloses electric air compressor machine has the inner space who is injectd by the casing, inside water jacket, stator and the rotor of setting up of casing, the stator centers on the rotor sets up, the water jacket fixed set up in inside the casing, and have the passageway and the holding that allow the fluid to pass through the cavity of stator, the stator has stator core, the cavity inner peripheral surface of water jacket with be provided with the restriction between stator core's the outer peripheral surface the water jacket with the stator is in the at least one spacing unit that produces relative displacement when electric air compressor machine operation.

In a possible embodiment, the water jacket and the stator core are in transition fit.

In a possible embodiment, the limiting unit is a pin, a screw or a weld.

In a possible embodiment, the limiting unit is made of metal.

In a possible embodiment, the material of the stopper unit is the same as the material of the water jacket.

In a possible embodiment, the stopper unit is not fixed to the cavity inner circumferential surface or the outer circumferential surface of the stator core, and is disposed between the cavity inner circumferential surface of the water jacket and the outer circumferential surface of the stator core by press-fitting.

In a possible implementation manner, the number of the limiting units is even, and the limiting units are axially symmetrically arranged at positions close to two axial ends of the stator core.

In a possible embodiment, at least a part of the limiting unit is fixed on the inner peripheral surface of the cavity, corresponding to the end position close to the axial direction of the stator core; and/or at least part of the limiting units are fixed on the peripheral surface of the stator core and close to the axial end position of the stator core.

According to the utility model discloses can adopt lower cost and nimble simple technology to realize the assembly between stator core and the water jacket.

For a better understanding of the nature and technical content of the present application, reference should be made to the following detailed description and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the present application.

Drawings

The foregoing and other aspects of the present application will be more fully understood and appreciated by reference to the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of an electric air compressor of the prior art;

fig. 2 is a schematic diagram of an embodiment of the electric air compressor according to the present application.

Detailed Description

To assist those skilled in the art in understanding the subject matter claimed herein, specific embodiments thereof are described below in detail with reference to the accompanying drawings.

Referring to fig. 2, an embodiment of the electric air compressor of the present application has an inner space defined by a housing 100, a water jacket 200, a stator 300 and a rotor 400 are disposed inside the housing 100, the stator 300 is disposed around the rotor 400, the water jacket 200 is fixedly disposed inside the housing 100 and has a passage (not shown) allowing a fluid to pass through and a cavity 210 accommodating the stator 300, the stator 300 has a stator core 310, and at least one stopper unit 500 for limiting a relative displacement between the water jacket 200 and the stator 300 when the electric air compressor is operated is disposed between an inner circumferential surface of the cavity 210 of the water jacket 200 and an outer circumferential surface of the stator core 310. In various embodiments, the limiting unit 500 is, for example, a pin, a screw, a welding member, or the like.

Since the interference fit is highly required for the process, various problems mentioned in the background art are liable to occur, and in the present application, a transition fit is preferably employed between the water jacket 200 and the stator core 310. Depending on the nature of the transition fit, there may be gaps or interference between the water jacket 200 and the stator core 310, but the resulting gaps and interference are relatively small, and the fit is easy to disassemble and assemble. Since the stopper unit 500 is small in size relative to the stator core 310, it is not necessary to apply as much force as particles that may affect the cleanliness of the system or undesirably deform the water jacket 200 when pressed between the water jacket 200 and the stator core 310 as mentioned in the background art. After the limiting unit 500 is added, sufficient friction force can be added between the water jacket 200 and the stator core 310, so that when the air compressor runs, relative displacement between the water jacket 200 and the stator 300 cannot occur.

In order to ensure the stability and durability of the system, the limiting unit 500 is made of metal in a preferred embodiment. For example, the stopper unit 500 may be made of the same material as the water jacket 200.

In the present embodiment, the stopper unit 500 is not fixed to the inner circumferential surface of the cavity 210 or the outer circumferential surface of the stator core 310, and is disposed between the inner circumferential surface of the cavity 210 of the stator 300 and the outer circumferential surface of the stator core 310 by press-fitting. In order to maintain stable balance, as shown in fig. 2, in the present embodiment, the number of the limiting units 500 is an even number, and the limiting units are respectively disposed at positions close to both ends of the stator core 310 in the axial direction and are symmetrical with respect to the center line o of the stator core 310. Further, the stopper unit 500 of each end is arranged in a rotationally symmetrical manner with respect to the end surface of the stator core 310.

In other embodiments, at least a part of the limiting unit 500 may be fixed to an inner circumferential surface of the cavity 210 at a position corresponding to an end near an axial direction of the stator core 310; and/or, at least part of the limiting unit 500 is fixed on the outer circumferential surface of the stator core 310 near the axial end position of the stator core 310. For example, at one end, the stopper unit 500 is fixed to the inner circumferential surface of the cavity 210, and at the other end, the stopper unit 500 is fixed to the outer circumferential surface of the stator core 300. In assembly, the end of the stator core 310, at which the position limiting unit 500 is not disposed, is first installed in the cavity 210, and finally, only a small force needs to be applied to completely press the stator core 300 and the position limiting unit 500 into the cavity 210. Alternatively, in other embodiments, it is also contemplated to have the fixed limiting unit 500 only at one end of the cavity 210 or the stator core 300, and to limit the other end by using the non-fixed limiting unit 500.

Thus, the present application solves the assembly problem between the stator core 300 and the water jacket 200 with a low cost and a flexible and simple process.

Although the application has been illustrated and described herein with reference to specific embodiments, the application is not intended to be limited to the details shown. Rather, various details of the application may be modified within the scope and equivalents of the claims.

Claims

1. An electric air compressor having an inner space defined by a housing (100), a water jacket (200), a stator (300) and a rotor (400) being disposed inside the housing (100), the stator (300) being disposed around the rotor (400), the water jacket (200) being fixedly disposed inside the housing (100) and having a passage allowing a fluid to pass therethrough and a cavity (210) receiving the stator (300), characterized in that the stator (300) has a stator core (310), and at least one stopper unit (500) limiting a relative displacement of the water jacket (200) and the stator (300) when the electric air compressor is operated is disposed between an inner circumferential surface of the cavity (210) and an outer circumferential surface of the stator core (310).

2. The electric air compressor as claimed in claim 1, wherein there is a transition fit between the water jacket (200) and the stator core (310).

3. The electric air compressor of claim 1, wherein the stopper unit (500) is not fixed to the inner circumferential surface of the cavity (210) or the outer circumferential surface of the stator core (310), and is disposed between the inner circumferential surface of the cavity (210) and the outer circumferential surface of the stator core (310) by press-fitting.

4. The electric air compressor of claim 1, wherein the position limiting units (500) are provided at positions close to both ends of the stator core (310) in the axial direction.

5. The electric air compressor as claimed in claim 4, wherein the number of the position limiting units (500) is an even number, and are symmetrically disposed at positions close to both axial ends of the stator core (310).

6. The electric air compressor of claim 5, wherein the stopper units (500) of each end are arranged in a rotationally symmetrical manner with respect to the end surface of the stator core (310).

7. The electric air compressor of claim 1, wherein at least a portion of the stopper unit (500) is fixed to an inner circumferential surface of the cavity (210) corresponding to an end position near an axial direction of the stator core (310); and/or at least part of the limiting unit (500) is fixed on the outer circumferential surface of the stator core (310) close to the axial end position of the stator core (310).

8. The electric air compressor of claim 1, wherein the position limiting unit (500) is a pin, a screw or a welding member.

9. The electric air compressor of claim 1, wherein the position limiting unit (500) is made of metal.

10. The electric air compressor of claim 9, wherein the material of the stopper unit (500) is the same as the material of the water jacket (200).