Casing assembly and air compressor

Abstract

The utility model provides a machine shell assembly which is used for the technical field of compressors, and particularly relates to a machine shell assembly which comprises an outer-layer water-cooled jacket, an inner-layer water-cooled jacket and a motor shell which are coaxially arranged. The motor shell is sleeved with the inner-layer water cooling sleeve, the inner-layer water cooling sleeve is sleeved with the outer-layer water cooling sleeve, the outer-layer water cooling sleeve is connected with the inner-layer water cooling sleeve in an interference fit mode, and the inner-layer water cooling sleeve is fixedly connected with the motor shell. According to the casing assembly, the casing is provided with the outer-layer water-cooled jacket, the inner-layer water-cooled jacket and the motor shell which are split, so that compared with integral casting, the machining precision of each assembly can be improved. The utility model further provides an air compressor. The air compressor comprises the machine shell assembly.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on November 9, 2023, with application number 202323030657.6 and patent name “A casing assembly, casing assembly processing method and air compressor”, all contents of which are incorporated by reference in this application. Technical Field

[0002] The present application relates to the technical field of compressors, and in particular to a casing assembly and an air compressor. Background Art

[0003] At the beginning of the design of the motor housing of the traditional high-speed air compressor, the overall cooling and aerodynamic performance verification scheme is integral casting. The casting method adopts sand mold casting or metal mold casting. The disadvantage of sand mold casting is that the shape and position tolerances after casting are quite different, and it is difficult to ensure the dimensional accuracy. At the same time, the surface roughness of the internal mold surface is poor, which can only reach the Ra12.5 level. Metal mold casting has high cost and long cycle, and the final demoulding scheme is difficult and has many casting defects. Utility Model Content

[0004] In view of this, the present application provides a casing assembly, which can improve the processing accuracy of each component compared with integral casting by configuring the casing to be a split outer water cooling jacket, an inner water cooling jacket and a motor housing.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A housing assembly, comprising:

[0007] An outer water cooling jacket, an inner water cooling jacket and a motor housing are coaxially arranged;

[0008] The inner water cooling jacket is sleeved on the motor housing, the outer water cooling jacket is sleeved on the inner water cooling jacket, the outer water cooling jacket is connected to the inner water cooling jacket by interference fit, and the inner water cooling jacket is fixedly connected to the motor housing.

[0009] Optionally, a water channel groove is provided on the outer periphery of the motor housing, and the water channel groove and the inner wall of the inner water cooling jacket form a cooling water channel.

[0010] Optionally, a water inlet and a water outlet are provided on the outer water cooling jacket, and the water inlet and the water outlet are respectively connected to the inlet and the outlet of the cooling water channel.

[0011] Optionally, a jacket alignment line is provided on the first axial end of the outer water cooling jacket.

[0012] Optionally, a casing alignment line for aligning with the outer sleeve alignment line is provided on the first axial end of the motor casing.

[0013] Optionally, de-rotation blades are provided on the outer periphery of the inner water-cooling jacket, and air passages are provided between adjacent de-rotation blades.

[0014] Optionally, the de-rotation blade is provided with a welding groove on the end surface of the second axial end of the inner water-cooling jacket.

[0015] Optionally, the length of the welding groove is smaller than the width of the end surface of the de-rotation blade.

[0016] Optionally, an inner sleeve alignment plane is provided on the first axial end of the inner water-cooling jacket, and the inner sleeve alignment plane is a reference plane when precision milling the outer water-cooling jacket.

[0017] The present application also provides an air compressor, comprising the casing assembly.

[0018] The housing assembly provided in the present application can improve the processing accuracy of each component compared with integral casting by configuring the housing to include a split outer water cooling jacket, an inner water cooling jacket and a motor housing;

[0019] The air compressor provided in the present application uses the above-mentioned casing assembly, which can improve the working efficiency of the air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 It is a three-dimensional schematic diagram of the casing assembly that has been processed in this application;

[0022] Figure 2 for Figure 1 A three-dimensional schematic diagram of the middle and outer water cooling jackets;

[0023] Figure 3 for Figure 1 A three-dimensional schematic diagram of the middle and inner water cooling jackets;

[0024] Figure 4 for Figure 3 Side view of

[0025] Figure 5 for Figure 1 A three-dimensional schematic diagram of the motor housing;

[0026] Figure 6 It is a schematic diagram of the blank of the outer water cooling jacket;

[0027] Figure 7 It is a schematic diagram of the blank of the inner water cooling jacket;

[0028] Figure 8 It is a schematic diagram of the blank of the motor housing;

[0029] Fig. 9 It is a schematic diagram of the outer water-cooling jacket and the inner water-cooling jacket after hot installation;

[0030] Fig.10 for Fig. 9 Schematic diagram of the first axial end of the component after fine turning;

[0031] Fig.11 for Fig. 9 A three-dimensional schematic diagram of the components after fine turning;

[0032] Fig.12 is a schematic diagram of the axial first end of the machined casing assembly;

[0033] Fig.13 The figure is a cross-sectional view of the completed casing assembly.

[0034] exist Figure 1-Figure 13 middle:

[0035] 1. Outer water cooling jacket; 11. First axial end of the outer water cooling jacket; 12. Second axial end of the outer water cooling jacket; 13. Water inlet; 14. Water outlet; 15. Alignment line of the outer jacket;

[0036] 2. Inner water-cooling jacket; 21. Axial first end of the inner water-cooling jacket; 22. Axial second end of the inner water-cooling jacket; 23. De-rotation blade; 231. Welding groove; 24. Airway; 25. Inner jacket alignment plane; 26. Through hole;

[0037] 3. Motor housing; 31. Axial first end of the motor housing; 32. Axial second end of the motor housing; 33. Water channel; 34. Housing alignment line; 35. Housing alignment plane;

[0038] 41. First welding seam; 42. Second welding seam. DETAILED DESCRIPTION

[0039] The present application provides a casing assembly for an air compressor. By configuring the casing to include a split outer water-cooling jacket, an inner water-cooling jacket and a motor housing, the processing accuracy of each component can be improved compared with integral casting.

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] like Figure 1-5 As shown, an embodiment of the present application provides a casing assembly for an air compressor, the casing assembly comprising:

[0042] An outer water cooling jacket 1, an inner water cooling jacket 2 and a motor housing 3 are coaxially arranged. Specifically, the inner water cooling jacket 2 is sleeved on the motor housing 3, and the outer water cooling jacket 1 is sleeved on the inner water cooling jacket 2;

[0043] exist Figure 2-5 In the figure, the right ends of the outer water cooling jacket 1, the inner water cooling jacket 2 and the motor housing 3 are respectively the axial first end 11 of the outer water cooling jacket, the axial first end 21 of the inner water cooling jacket and the axial first end 31 of the motor housing, and the left ends of the outer water cooling jacket 1, the inner water cooling jacket 2 and the motor housing 3 are respectively the axial second end 12 of the outer water cooling jacket, the axial second end 22 of the inner water cooling jacket and the axial second end 32 of the motor housing;

[0044] The outer water cooling jacket 1 is connected to the inner water cooling jacket 2 by interference fit, and the inner water cooling jacket 2 is fixedly connected to the motor housing 3 .

[0045] The housing assembly provided in the present application can improve the processing accuracy of each component compared with integral casting by configuring the housing as a split outer water cooling jacket 1, an inner water cooling jacket 2 and a motor housing 3.

[0046] like Figure 2-5 As shown, in a preferred embodiment, in order to cool the motor and other components in the casing assembly, a water channel groove 33 is provided on the outer periphery of the motor housing 3, and the water channel groove 33 and the inner wall of the inner water cooling jacket 2 form a cooling water channel. By injecting water into the cooling water channel to form a continuous water flow, the heat of the motor housing 3 and its internal motor and other components is continuously taken away to achieve a cooling effect.

[0047] Further, if Figure 2-5As shown, in a preferred embodiment, a water inlet 13 and a water outlet 14 are provided on the outer water cooling jacket 1, and the water inlet 13 and the water outlet 14 of the outer water cooling jacket 1 are respectively connected with the inlet and the outlet of the cooling water channel through the through holes 26 on the inner water cooling jacket 2 (when the outer water cooling jacket 1 and the inner water cooling jacket 2 are heat-fitted and interference-fitted, the water inlet 13 and the water outlet 14 on the outer water cooling jacket 1 need to be aligned with the two through holes 26 on the inner water cooling jacket 2). In this way, cooling water can be introduced from the water inlet 13 of the outer water cooling jacket 1, passed through the cooling water channel and then discharged from the water outlet 14, thereby realizing the cooling of the motor.

[0048] like Figure 10-12 As shown, in a preferred embodiment, an outer jacket alignment line 15 is provided on the axial first end of the outer water cooling jacket 1. Since the water inlet 13 and the water outlet 14 provided on the outer water cooling jacket 1 need to correspond to the inlet and outlet of the cooling water channel during assembly, that is, correspond to the position of the water channel groove 33 on the motor housing 3, after the outer water cooling jacket 1 and the inner water cooling jacket 2 are heat-fitted and interference-fitted, when the motor housing 3 is assembled with the former two, the outer jacket alignment line 15 can be aligned with the marking line on the motor housing 3, so that the water inlet 13 and the water outlet 14 on the outer water cooling jacket 1 can be aligned with the position of the water channel groove 33 provided on the outer periphery of the motor housing 3.

[0049] Further, if Figure 10-12 As shown, in a preferred embodiment, a casing alignment line 34 for aligning with the outer jacket alignment line 15 is provided on the axial first end 31 of the motor casing; therefore, after the outer water cooling jacket 1 and the inner water cooling jacket 2 are heat-fitted and interference-fitted, when the motor casing 3 is assembled with the former two, the outer jacket alignment line 15 can be aligned with the casing alignment line 34, so that the water inlet 13 and the water outlet 14 on the outer water cooling jacket 1 can be aligned with the position of the waterway groove 33 provided on the outer periphery of the motor casing 3.

[0050] like Figure 3 As shown, in a preferred embodiment, in order to avoid the generation of eddy currents, anti-rotation blades 23 are provided on the outer periphery of the inner water cooling jacket 2, and air passages 24 are provided between adjacent anti-rotation blades 23;

[0051] In a preferred embodiment, Figure 4 As shown, the de-rotation blade 23 is provided with a welding groove 231 on the end surface of the second axial end of the inner water-cooling jacket 2 .

[0052] In order to prevent the inner water-cooling jacket 2 and the outer water-cooling jacket 1 from relative axial movement during welding, the wider tail of the de-rotation blade 23 (i.e. Figure 4 A welding groove 231 is milled on the left end of the middle part.

[0053] Further, the length of the welding groove 231 ( Figure 4 The width of the end surface of the de-rotation blade 23 is smaller than the width of the end surface of the de-rotation blade 23 ( Figure 4 middle and upper and lower directions).

[0054] The welding groove 231 cannot be milled to the side wall of the de-cyclone blade 23 to prevent the welding melt from flowing into the de-cyclone airway 24 . Therefore, the length of the welding groove 231 is set to be smaller than the width of the end face on one side of the tail of the de-cyclone blade 23 .

[0055] like Figure 10-11 As shown, in a preferred embodiment, an inner sleeve alignment plane 25 is provided on the first axial end of the inner water-cooling jacket 2 , and the inner sleeve alignment plane 25 is a reference plane when fine milling the outer water-cooling jacket 1 .

[0056] The purpose of providing the inner sleeve alignment plane 25 on the axial first end of the inner water-cooling jacket 2 is that, since the relative position of the de-rotation blade 23 with the inner water-cooling jacket 2 must be ensured when the external features of the outer water-cooling jacket 1 are subsequently processed, a margin is reserved at the front end of the de-rotation blade 23 (that is, the axial first end of the inner water-cooling jacket 2) for processing the inner sleeve alignment plane 25. In this way, after the outer water-cooling jacket 1 and the inner water-cooling jacket 2 are assembled by interference fit, the inner sleeve alignment plane 25 can be used as a reference to further fine-mill the features of the outer water-cooling jacket 1.

[0057] The present application also provides a method for processing a housing component, the processing steps of which include:

[0058] Pre-process the outer water cooling jacket 1, that is, Figure 6 Pre-processing the blank of the outer water cooling jacket 1;

[0059] Pre-process the inner water cooling jacket 2, that is, Figure 7 Pre-processing the blank of the inner water cooling jacket 2;

[0060] Pre-processing the motor housing 3, that is, Figure 8 Pre-processing the blank of the motor housing 3;

[0061] The pre-processed outer water-cooling jacket 1, inner water-cooling jacket 2 and motor housing 3 are assembled and re-processed.

[0062] The casing component processing method provided in the present application adopts a layered processing process method for multi-layer composite motor structures that require rapid testing and verification, and then performs interference fit and secondary processing on the components. On the one hand, it can improve the processing tolerance level, and on the other hand, it can quickly respond to the trial production process, conduct rapid iterative verification of the design solution, and achieve rapid technical verification of the project.

[0063] In a preferred embodiment, the processing steps of pre-processing the outer water cooling jacket 1 include:

[0064] right Figure 6 The outer water-cooling jacket 1 blank is rough-machined according to the shape characteristics, and the two end faces and the outer periphery of the outer water-cooling jacket 1 blank are reserved with a size margin, and the two end faces and the outer periphery are reserved with a size margin of 2 mm;

[0065] Then, the inner hole of the outer water-cooling jacket 1 is finely processed according to the assembly size, and the inner hole is used for subsequent assembly with the inner water-cooling jacket 2.

[0066] In a preferred embodiment, the processing steps for the inner hole of the outer water-cooling jacket 1 include: rough turning, removing stress deformation by artificial aging treatment, and fine turning, which is to control the uniformity of the deformation and shape allowance of the parts to improve the subsequent processing speed of the machining center.

[0067] In a preferred embodiment, the processing steps of pre-processing the inner water cooling jacket 2 include:

[0068] right Figure 7 The blank of the inner water-cooling jacket 2 is rough-machined according to the shape characteristics, and the sizes of the two end faces and the outer periphery of the blank of the inner water-cooling jacket 2 are reserved, wherein the end face of the first axial end of the inner water-cooling jacket 2 is reserved with a 4mm margin, and the end face and the outer periphery of the second axial end of the inner water-cooling jacket 2 are reserved with a 2mm margin;

[0069] Use a five-axis machining center to mill the de-rotation blades 23 and the air passage 24 on the outer periphery of the inner water-cooling jacket 2 according to the model. The de-rotation blades 23 need to be milled to the finished product size;

[0070] An inner jacket alignment plane 25 is milled out at the first axial end of the inner water-cooling jacket 2;

[0071] The outer circle of the inner water-cooling jacket 2 is precision-turned according to the dimensions on the drawing. Since the outer circle of the inner water-cooling jacket 2 needs to be fitted with the inner hole of the outer water-cooling jacket 1 through interference fit, the interference amount must be ensured.

[0072] In a preferred embodiment, the processing steps of pre-processing the motor housing 3 include:

[0073] right Figure 8 The blank of the motor housing 3 is rough-turned according to the shape characteristics, and the size of the two end faces and the outer periphery of the blank of the motor housing 3 is reserved, and the two end faces and the outer periphery are reserved according to 2mm;

[0074] The water channel groove 33 is finely milled on the outer periphery of the motor housing 3 by using a four-axis machining center;

[0075] A casing alignment plane 35 is milled out at the axial first end 31 of the motor casing;

[0076] The inner cavity of the motor housing 3 is finely milled according to the housing alignment plane 35;

[0077] A casing alignment line 34 is milled at the axial first end 31 of the motor casing for alignment with the outer casing alignment line 15 during later assembly.

[0078] In a preferred embodiment, the steps of assembling and secondary processing the pre-processed outer water cooling jacket 1, the inner water cooling jacket 2 and the motor housing 3 include:

[0079] Using the principle of thermal expansion and contraction, the outer water-cooling jacket 1 is baked in an oven to expand its inner hole;

[0080] like Fig. 9 As shown, the inner water-cooling jacket 2 is placed into the inner hole of the heated outer water-cooling jacket 1 in the corresponding direction using a tool to ensure the axial positioning of the two;

[0081] The outer water-cooling jacket 1 and the inner water-cooling jacket 2 that have been hot-assembled are laser welded at the welding groove 231 at the tail of the de-rotation blade 23;

[0082] Taking the end face of the inner water-cooling jacket 2 as a reference, the flange end faces at both ends of the outer water-cooling jacket 1 are precision-machined, thereby eliminating the relative axial movement between the inner water-cooling jacket 2 and the outer water-cooling jacket 1 during the hot-loading cooling process;

[0083] Using the inner sleeve alignment plane 25 as a reference, finish milling the features of the outer water-cooling jacket 1;

[0084] The flanges at both ends of the outer water-cooling jacket 1 are precision milled, and the outer jacket alignment line 15 is milled out at the first axial end of the outer water-cooling jacket 1;

[0085] like Fig.13 As shown, the jacket alignment line 15 and the casing alignment line 34 are aligned, and the motor housing 3 is welded to the assembled outer water cooling jacket 1 and the inner water cooling jacket 2 as a whole. Specifically, Fig.13 Welding is performed at the first welding seam 41 and the second welding seam 42;

[0086] Then finish turning the motor housing 3, specifically:

[0087] Finish turning the axial first end 31 of the motor housing, i.e. the end surface and inner hole of the stator assembly end;

[0088] Finish turning the axial second end 32 of the motor housing, i.e. the primary side of the motor housing 3;

[0089] The two end holes and features of the milling motor housing 3.

[0090] In a preferred embodiment, after the hot-assembled outer water-cooling jacket 1 and the inner water-cooling jacket 2 are welded at the welding groove 231 of the de-rotation blade 23, in order to avoid the airtightness failing to meet the standard and thus causing the overall airtightness failing to meet the standard after subsequent assembly with the motor housing 3, the assembled outer water-cooling jacket 1 and the inner water-cooling jacket 2 need to be tested for airtightness.

[0091] Specifically, airtight tooling is installed at the water inlet 13 and the water outlet 14 of the outer water cooling jacket 1, and the airtightness detection is performed on the two welds of the cooling water channel. If there is leakage, it can be repaired in time.

[0092] In a preferred embodiment, after fine turning the motor housing 3, it is necessary to perform an overall airtightness test on the assembled outer water cooling jacket 1, the inner water cooling jacket 2 and the motor housing 3, especially the airtightness test on the first welding seam 41 and the second welding seam 42. Specifically, airtight tooling is installed at the water inlet 13 and the water outlet 14 of the outer water cooling jacket 1 to check whether there is a leak. If there is a leak, it is handled accordingly; the airtight tooling must be reliable and should not damage the workpiece; and the problem of water channel leakage or air channel 24 penetration due to machining removal is eliminated.

[0093] The present application also provides an air compressor, including the above-mentioned casing assembly, which can improve the working efficiency of the air compressor.

[0094] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0095] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0096] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed or recombined, and these decompositions or recombinations should be regarded as equivalent solutions of the present application.

[0097] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0098] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0099] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A housing assembly, characterized in that: include: An outer water cooling jacket, an inner water cooling jacket and a motor housing are coaxially arranged; The inner water cooling jacket is sleeved on the motor housing, the outer water cooling jacket is sleeved on the inner water cooling jacket, the outer water cooling jacket is connected to the inner water cooling jacket by interference fit, and the inner water cooling jacket is fixedly connected to the motor housing.

2. The housing assembly according to claim 1, characterized in that: A water channel groove is arranged on the outer periphery of the motor housing, and the water channel groove and the inner wall of the inner water cooling jacket form a cooling water channel.

3. The housing assembly according to claim 2, characterized in that: The outer water cooling jacket is provided with a water inlet and a water outlet, and the water inlet and the water outlet are respectively connected with the inlet and the outlet of the cooling water channel.

4. The housing assembly according to claim 3, characterized in that: An outer jacket alignment line is arranged on the first axial end of the outer water cooling jacket.

5. The housing assembly according to claim 4, characterized in that: A casing alignment line for aligning with the outer sleeve alignment line is arranged on the first axial end of the motor casing.

6. The housing assembly according to claim 5, characterized in that: De-rotation blades are arranged on the outer periphery of the inner water cooling jacket, and air passages are arranged between adjacent de-rotation blades.

7. The housing assembly according to claim 6, characterized in that: The de-rotation blade is provided with a welding groove on the end surface of the second axial end of the inner water-cooling jacket.

8. The housing assembly according to claim 7, characterized in that: The length of the welding groove is smaller than the width of the end surface of the de-rotation blade.

9. The housing assembly according to claim 8, characterized in that: An inner sleeve alignment plane is arranged on the first axial end of the inner layer water cooling jacket, and the inner sleeve alignment plane is a reference plane when fine milling the outer layer water cooling jacket.

10. An air compressor, characterized in that: It comprises a casing assembly as described in any one of claims 1-9.

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