Structure of an electric scroll compressor under limited installation space

Abstract

The utility model discloses a kind of structures of electric scroll compressor under the condition of installation space limited, compact structure arrangement, high cooperation precision.The end face of the motor housing opening end is provided with multiple cylindrical bosses, multiple cylindrical bosses are along motor housing annular distribution, each cylindrical boss is equipped with a motor housing threaded hole respectively, end cover fastening bolt is cooperated in motor housing threaded hole, the outer arc of cylindrical boss is radially protruding on the outer surface of motor housing, the inner arc of cylindrical boss is radially protruding in motor housing inner cavity, the outer circle of the static disc is provided with static disc outer circle avoidance circular-arc gap of cylindrical boss inner arc, the outer circle of the wear pad is provided with wear pad avoidance circular-arc gap of cylindrical boss inner arc, the outer circle of the bearing seat is provided with bearing seat avoidance circular-arc gap of cylindrical boss inner arc, cylindrical boss forms the circumferential positioning of static disc, wear pad, bearing seat.

Description

Technical Field

[0001] This utility model relates to the field of electric scroll compressor technology, and in particular to a structure for an electric scroll compressor under limited installation space conditions, as well as a pump body and motor positioning structure for an electric scroll compressor. Background Technology

[0002] Currently, the electric scroll compressors used in hybrid electric vehicles are mostly installed on the engine and gearbox housing (the original installation location of traditional compressors). Due to the addition of new electric components to the vehicle, the space for the compressor is even smaller. Because of the added motor and controller structure, the electric compressor is larger than a traditional compressor. Furthermore, ensuring safe clearances between the compressor and other parts of the vehicle further restricts its size. Therefore, a reasonable structural layout for the compressor is crucial. Only by minimizing its external dimensions to accommodate the dimensions of other parts of the vehicle can the assembly requirements be met. The change in the compressor's external dimensions is directly constrained by the distribution of the end cover fastening screws, and also affects the internal structure layout, especially the pump body and motor arrangement, directly impacting the compressor's performance, lifespan, and comfort. The arrangement of the fastening bolts between the motor housing and the end cover is limited by the position of the exhaust pipe on the vehicle, the exhaust port on the end cover, and the local safety clearance between the electric compressor and various components. To ensure good assembly of the electric compressor, it is very important to arrange the position of the fastening bolts between the motor housing and the end cover. This determines the sealing of the joint surface between the end cover and the motor housing, the arrangement structure of the pump body and the motor, and the external dimensions of the electric compressor. Due to limitations in local dimensions and structure, placing the six threaded holes on a larger diameter circle on the motor housing end face results in uneven distribution of the six threaded holes. This might even increase the number of threaded holes and fastening bolts to ensure even stress distribution on the sealing gasket, thus increasing assembly and material costs. Placing them on a smaller diameter circle would cause the threaded holes to enter the fourth-step cavity of the motor housing, and the screw would affect the pump body's layout. Distributing the six threaded holes evenly on a circle of appropriate diameter, such as using the step surface of the fourth-step cavity of the motor housing as the axial positioning surface of the bearing seat, would require the threaded holes to be placed on the step surface of the fourth-step cavity, not the end face of the motor housing. However, this structure increases the distance from the threaded holes to the end cover, requiring longer fastening bolts, increasing the overall weight and material costs. It also results in semi-circular bolt holes on the motor housing end face, allowing internal compressor gas to leak along these holes to the bolt head end face. This necessitates considering the sealing structure between the motor housing end face and the end cover end face, as well as between the end cover and the fastening bolt head end face, making the sealing structure more complex and increasing assembly and material costs.

[0003] Therefore, choosing a simple, reliable, easy-to-process and assemble compressor with a small external size can solve the assembly of electric compressors in confined spaces in a vehicle. At the same time, it makes the sealing structure of the motor housing end face joint simple and reliable, improves the assembly accuracy of the motor and pump body, thereby effectively improving the performance, life and comfort of the compressor, simplifying the compressor assembly process and reducing the cost of the compressor. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem that compressors cannot be assembled in vehicles with limited installation space in the prior art. It provides a structure for electric scroll compressors under limited installation space conditions. Through compact structural layout and high-precision structural fit, the compressor has a smaller size and effectively improves the performance, lifespan and comfort of the compressor.

[0005] The purpose of this utility model is achieved as follows:

[0006] A structure for an electric scroll compressor under limited installation space includes a motor housing, end covers, end cover gaskets, bearing housings, bearing housing bearings, motor housing bearings, a motor shaft, a motor rotor, a motor stator, a stationary disc, and wear-resistant pads. The open end of the motor housing has a motor housing end face. The motor housing end face and the end cover are tightened and fixed together by multiple end cover fastening bolts. The end cover gasket is clamped and fixed between the motor housing end face and the end cover. The bearing housing and the stationary disc are installed sequentially from the inside to the outside in the open end of the motor housing. A wear-resistant pad is placed between the bearing housing and the stationary disc. The bearing housing bearing is press-fitted into a bearing hole provided in the inner cavity of the bearing housing. The motor housing bearing is press-fitted into a bearing hole provided in the closed end of the motor housing. Both ends of the motor shaft are press-fitted into the inner holes of the bearing housing bearing and the motor housing bearing, respectively. The motor rotor is mounted on the motor shaft, and the motor stator is assembled inside the motor housing.

[0007] Multiple cylindrical bosses are provided on the end face of the open end of the motor housing. The multiple cylindrical bosses are distributed in a ring along the motor housing. Each cylindrical boss is provided with a threaded hole for the motor housing. The end cap fastening bolt is fitted into the threaded hole of the motor housing. The outer arc of the cylindrical boss protrudes radially outward from the outer surface of the motor housing, and the inner arc of the cylindrical boss protrudes radially inward from the inner cavity of the motor housing. The outer circular surface of the stationary plate is provided with a notch to avoid the inner arc of the cylindrical boss. The outer circle of the wear-resistant pad is provided with a notch to avoid the inner arc of the cylindrical boss. The outer circular surface of the bearing seat is provided with a notch to avoid the inner arc of the cylindrical boss. The cylindrical bosses form a circumferential positioning for the stationary plate, the wear-resistant pad, and the bearing seat.

[0008] Preferably, the wear-resistant pad is provided with an oil passage hole, and the lower end face of the stationary plate is provided with an oil outlet hole. The oil outlet hole of the stationary plate is connected to the oil inlet channel of the stationary plate and the oil passage hole of the wear-resistant pad. A connecting oil passage ring groove and an oil inlet groove are provided on the end face of the bearing housing. The oil inlet channel of the stationary plate is connected to the oil passage ring groove on the end face of the bearing housing. The oil inlet channel and oil outlet hole of the stationary plate, together with the oil passage hole of the wear-resistant pad, the oil passage ring groove on the bearing housing, and the oil inlet groove on the bearing housing, constitute the return oil channel of the pump body. The lubricating oil separated from the oil separator flows into the inner cavity of the bearing housing through the return oil channel.

[0009] Preferably, the inner cavity of the motor housing is provided with concentric first-step cavities, second-step cavities, third-step cavities, and fourth-step cavities. The fourth-step cavity has a boss at the center of its inner bottom surface, and the boss has a bearing hole for assembling the motor housing bearing. The third-step cavity is a cylindrical cavity, and the joint between the third-step cavity and the fourth-step cavity is provided with a stator positioning step. The second-step cavity is a cylindrical cavity and is used to accommodate the lower part of the bearing seat and the upper part of the motor. The joint between the third-step cavity and the second-step cavity is an inclined surface, which is used to guide the assembly of the motor stator. The first-step cavity is a cylindrical cavity, and the joint between the first-step cavity and the second-step cavity is provided with a bearing seat positioning step, which is used to position the bearing seat and the stationary plate.

[0010] Preferably, the bearing housing end face is provided with two bearing housing positioning holes, which are distributed on a circle centered on the bearing housing axis. The wear-resistant pad is provided with two wear-resistant pad positioning holes. The bearing housing and the stationary plate are connected and positioned by two stationary plate positioning pins inserted into the wear-resistant pad positioning holes and the bearing housing positioning holes. The end cover is provided with two end cover positioning holes. The back of the stationary plate is provided with two stationary plate back positioning pin holes for assembling positioning pins and connecting them to the end cover. The end face of the stationary plate is provided with two stationary plate end face positioning pin holes for assembling positioning pins and connecting them to the bearing housing.

[0011] By adopting the above technical solution, the miniaturization of the compressor's shape is achieved, making it suitable for assembly within the confined space of a vehicle, thus optimizing the assembly process and reducing costs. The rational arrangement of the fastening bolts between the motor housing and the end cover enables the compressor to be assembled within the vehicle's limited space; the six fastening bolts are evenly distributed on the end face of the motor housing, improving assembly manufacturability; the machining accuracy of the coaxiality of the centers of each cavity in the motor housing is improved, enhancing the assembly accuracy of the motor stator and rotor, thereby increasing motor efficiency; the locating pin structure ensures the coaxiality requirement between the pump body and the motor after assembly, reducing uneven wear between pump bodies; the oil groove is located on the bearing seat instead of on the wear-resistant pad, improving the strength and reliability of the wear-resistant pad; the sealing surfaces of the threaded holes between the end face of the motor housing and the end face of the end cover, and between the end cover and the motor housing are simplified, reducing the risk of leakage from the housing. Through the implementation of the above structure, the compressor experiences less vibration, lower noise, lower energy consumption, and a longer lifespan during operation, thereby improving compressor performance, improving assembly manufacturability, and reducing costs. This utility model has the following beneficial effects:

[0012] 1. It enables the assembly of the compressor within the confined space of the vehicle. Through the rational arrangement of the fastening bolts between the motor housing and the end cover, the compressor is made smaller in both its overall shape and local dimensions, making it more suitable for assembly in vehicles with limited space.

[0013] 2. Improved motor efficiency and reduced motor noise: Ensuring proper alignment of the motor stator and rotor allows for maximum torque through magnetic field interaction. Improved coaxiality achieved through machining the centers of the motor housing cavities and the alignment of the outer circle of the bearing housing flange with the center of the bearing hole inside the inner bore results in higher coaxiality precision of the assembled motor stator and rotor. This leads to a more uniform air gap and reduced motor operating noise.

[0014] 3. Improved compressor performance and NVH, reduced wear between pump bodies and extended compressor life: Due to the unified center of assembly and positioning, the coaxiality requirement between the pump body and the motor is ensured by the positioning pin structure, which improves the assembly accuracy of the compressor and reduces wear between pump bodies.

[0015] 4. The machine has a simple structure and a simple and reliable assembly process, resulting in significant cost advantages: The multiple end cap fastening bolts are optimized into six evenly distributed bolts, which optimizes the assembly process, minimizes the number and length of fastening bolts, and saves processing and material costs; multiple locating pins and locating steps are used for positioning, making the structure simple and reliable.

[0016] 5. Simple and reliable sealing structure with significant cost advantages: The end face seal is simple, requiring only sealing lines around the six bolt holes and the end face, without the need for additional structures. The six evenly distributed bolts ensure uniform and reliable force distribution in all directions. This simplifies the sealing surface between the motor housing end face and the end cover end face, and between the end cover and the motor housing, reducing the risk of leakage from the housing.

[0017] 6. Improved component strength: The oil ring groove is opened on the end face of the bearing housing instead of on the wear pad, which ensures that the outer circle of the wear pad is not affected by the thinning of the edge of the annular hole due to the avoidance of the threaded boss on the motor housing, thus reducing its strength.

[0018] 7. Lighter overall weight and longer driving range: The six fastening bolts between the motor housing and the end cover are evenly distributed on the end face of the motor housing, which reduces the size of the motor housing. The outer circle of the stationary disc, bearing seat, and wear pad avoids the concave surface formed by the protrusion of the threaded column, which reduces the weight of the parts and reduces material costs. At the same time, the lighter weight of the whole machine makes the whole vehicle consume less energy and has a longer driving range.

[0019] 8. The motor housing has good machinability and the machining accuracy is easier to guarantee: The machining surfaces of the second, third and fourth cavities can be machined in one clamping with a tool, ensuring the concentricity requirement. The corner groove on the inner side of the bearing seat positioning surface of the first cavity is formed by mold, so that the machining of this surface does not require root cleaning, simplifying the machining process. Attached Figure Description

[0020] Figure 1 This is a front view of the assembly structure of an electric scroll compressor under limited installation space conditions according to this utility model;

[0021] Figure 2 This is a front view of the assembly structure of an electric scroll compressor under limited installation space conditions according to this utility model;

[0022] Figure 3 This is a front view of the motor housing of an electric scroll compressor designed for installation under limited space conditions, according to this utility model.

[0023] Figure 4 This is a front view of the motor housing of an electric scroll compressor designed for installation under limited space conditions, according to this utility model.

[0024] Figure 5 This is a top view of the stationary disc and locating pin assembly of an electric scroll compressor under limited installation space conditions according to this utility model.

[0025] Figure 6 This is a bottom view of the static plate and locating pin assembly of an electric scroll compressor under limited installation space conditions according to this utility model.

[0026] Figure 7 This is a front view of the wear-resistant pad of an electric scroll compressor under limited installation space conditions according to this utility model;

[0027] Figure 8 This is a front view of the bearing housing of an electric scroll compressor under limited installation space conditions according to this utility model;

[0028] Figure 9 This is a front view of the bearing housing of an electric scroll compressor under limited installation space conditions according to this utility model;

[0029] Figure 10 This is a front view of the end cover of an electric scroll compressor structure under limited installation space conditions according to this utility model;

[0030] Figure 11 This is a front view of the end cover sealing gasket of an electric scroll compressor designed for installation under limited space conditions.

[0031] Figure Labels

[0032] In the attached diagram, 1-motor housing, 2-motor stator, 3-motor rotor, 4-motor shaft, 5-bearing housing, 6-stationary disc, 7-end cover, 8-end cover gasket, 9-wear-resistant pad, 10-bearing housing bearing, 11-motor housing bearing, 12-end cover fastening bolt, 13-stationary disc locating pin, 101-first stepped cavity, 102-second stepped cavity, 103-third stepped cavity, 104-fourth stepped cavity, 201-motor housing bearing hole, 202-motor housing bearing hole boss, 203-motor stator locating step, 204-transition slope, 205-bearing housing locating step, 206-motor housing end face, 207-machined corner groove, 208-cylindrical boss, 209-motor housing thread. 210 - Positioning pin hole on the back of the stationary disc; 211 - Avoidance arc notch on the outer circle of the stationary disc; 212 - Positioning pin hole on the end face of the stationary disc; 213 - Oil outlet hole of the stationary disc; 214 - Oil passage hole of the wear-resistant pad; 215 - Avoidance arc notch on the wear-resistant pad; 216 - Positioning hole of the wear-resistant pad; 217 - Back of the outer circle of the bearing housing; 218 - Bearing hole of the bearing housing; 219 - Flange of the bearing housing; 220 - Oil passage ring groove; 221 - Avoidance arc notch on the bearing housing; 222 - Positioning hole of the bearing housing; 223 - End face of the end cover; 224 - Positioning hole of the end cover; 225 - Bolt passage hole of the end cover; 226 - Exhaust port; 227 - Bolt passage hole of the end cover sealing gasket; 228 - Sealing rib of the bolt passage hole of the end cover sealing gasket; 229 - End face of the bearing housing; 230 - Oil inlet groove;

[0033] 301 - Center circle of threaded hole in motor housing; 302 - Center circle of locating pin hole on back of stationary disc; 303 - Center circle of locating pin hole on end face of stationary disc; 304 - Center circle of locating pin hole in wear-resistant pad; 305 - Center circle of locating pin hole in bearing seat; 306 - Center circle of bolt through hole in end cover; 307 - Center circle of locating hole in end cover; 308 - Center circle of bolt through hole in end cover sealing gasket. Detailed Implementation

[0034] Please see Figures 1 to 11 A structure for an electric scroll compressor under limited installation space includes a motor housing 1, a motor stator 2, a motor rotor 3, a motor shaft 4, a bearing housing 5, a stationary disc 6, an end cover 7, an end cover sealing gasket 8, a wear-resistant pad 9, a bearing housing bearing 10, a motor housing bearing 11, an end cover fastening bolt 12, and a stationary disc positioning pin 13. The motor housing end face 206 has six evenly distributed motor housing threaded holes 209. The end cover sealing gasket 8 is located on the outside of the motor housing end face 206. The end cover 7 is fastened to the end cover sealing gasket 8 and is connected and fastened by six end cover fastening bolts 12 through the six evenly distributed motor housing threaded holes 209 on the motor housing end face 206. The bearing seat 5 is mounted on the bearing seat positioning stepped surface 205 in the inner cavity of the motor housing 1. The wear-resistant pad 9 is mounted on the bearing seat end face 229. The stationary plate 6 is fastened to the end face of the wear-resistant pad 9 and is positioned by two stationary plate positioning pins 13 connected to the two positioning holes 216 of the wear-resistant pad and the two positioning holes 222 of the bearing seat. The stationary plate 6 and the end cover 7 are positioned by two positioning pins connected to the two positioning pin holes 210 on the back of the stationary plate and the two positioning holes 224 of the end cover. The bearing seat shaft... The bearing 10 is press-fitted into the bearing hole 218 inside the bearing housing cavity. The motor housing bearing 11 is press-fitted into the bearing hole 201 at the bottom of the motor housing. The two ends of the motor shaft 4 are respectively press-fitted into the inner holes of the bearing housing bearing 10 and the motor housing bearing 11. The motor rotor 3 is installed at the positioning step in the middle of the motor shaft 4. The motor stator 2 is assembled in the third cavity 103 of the motor housing and positioned by the motor stator positioning step 203. The height position of the motor stator 2 and the motor rotor 3 is ensured by a certain distance between the end face of the motor rotor 3 fixed on the motor shaft 4 and the end face of the bearing housing bearing 10. The uniformity of the air gap of the motor rotor 3 installed in the motor stator 2 is ensured by the coaxiality of the inner hole of the bearing housing bearing 10 after assembly, the inner circular surface of the second step cavity 102 of the motor housing, and the inner hole of the motor housing bearing 11.

[0035] The inner cavity of the motor housing has four concentric stepped cavities. The fourth stepped cavity 104 has a boss at the center of its bottom surface, and the boss has a bearing hole for assembling the motor housing bearing. The third stepped cavity 103 is a cylinder, and the joint with the fourth stepped cavity has a stator positioning step for assembling the motor stator. The second stepped cavity 102 is a cylinder that accommodates the lower part of the bearing seat and the upper part of the motor. The joint between the third stepped cavity 103 and the second stepped cavity is an inclined surface, which makes it easier for the motor stator to fall into the third stepped cavity 103 during assembly. The first stepped cavity 101 is a cylinder, and the joint with the second stepped cavity 102 has a bearing seat positioning step for positioning the bearing seat and the stationary plate. A corner clearing groove 207 is provided on the side of the bearing seat positioning step against the wall.

[0036] The end face of the motor housing 1 is provided with six cylindrical bosses 208. The centers of the six cylindrical bosses are evenly distributed on a circle of a certain diameter at the center of the inner cavity of the motor housing (the center circle 301 of the threaded hole in the motor housing). Each cylindrical boss has a threaded hole 209 in the motor housing at its center. The cylindrical bosses 208 protrude outward from the outer surface of the motor housing and protrude inward from the inner surface of the fourth stepped cavity 104 of the motor housing.

[0037] The outer surface of the stationary disc has a semi-circular notch (stationary disc outer surface avoidance arc notch 211) to avoid six protruding structures in the fourth-step cavity of the motor housing. The upper end face is provided with two positioning pin holes (stationary disc back positioning pin hole 210) for assembling positioning pins to connect with the end cover 7. The lower end face is provided with two positioning pin holes (stationary disc end face positioning pin hole 212) for assembling positioning pins to connect with the bearing seat 5. The lower end face of the stationary disc is provided with a stationary disc oil outlet hole 213, which is connected to the stationary disc oil inlet channel (connecting to the stationary disc oil outlet hole 213) and the wear-resistant pad oil passage hole 214.

[0038] The wear-resistant pad has a semi-circular notch (wear-resistant pad clearance arc notch 215) on its outer circumference to avoid six protruding structures in the fourth-step cavity of the motor housing. It also has two wear-resistant pad positioning holes 216 and one wear-resistant pad oil passage hole 214.

[0039] The outer surface of the large disc of the bearing housing 5 has a semi-circular notch (bearing housing clearance arc notch 221) to avoid six protruding structures in the fourth-step cavity of the motor housing. An oil ring groove 220 and an oil inlet groove 230 are provided on the end face of the large disc of the bearing housing. Two locating pin holes are also provided on the end face, distributed on a circle. The outer back of the bearing housing is axially positioned in contact with the bottom surface of the fourth-step cavity of the motor housing. A flange is provided on the outer back of the bearing housing, and the outer surface of the flange mates with the inner surface of the step in the third-step cavity of the motor housing for radial positioning. The inner cavity of the bearing housing has a bearing housing bearing hole. The center of the circle where the two locating pin holes are distributed (bearing housing locating pin center circle 305) has corresponding coaxiality requirements with the center of the bearing housing bearing hole and the center of the outer surface of the flange.

[0040] The motor assembly is as follows: the motor stator is installed in the second-step cavity 102 of the motor housing; the motor housing bearing 11 is installed in the motor housing bearing hole 201 of the first-step cavity 101 of the motor housing; the bearing seat bearing 10 is installed in the bearing hole 218 inside the bearing seat; the back side 217 of the bearing seat large disc mates with the stepped surface of the fourth-step cavity 104 of the motor housing for axial positioning, and is fastened by the end cover fastening bolt 12 through the wear-resistant pad 9, the stationary disc 6, and the end cover 7; the outer circular surface 219 of the bearing seat flange mates with the inner circle of the third-step cavity 103 of the motor housing for radial positioning; the motor rotor 3 is installed on the motor shaft 4; the lower end of the motor shaft 4 is installed in the inner hole of the motor housing bearing 10 with a small clearance fit, and the upper end of the motor shaft 4 is installed in the inner hole of the bearing seat bearing 10 with an interference fit; by adjusting the height of the upper end of the motor shaft 4 installed in the inner hole of the bearing seat bearing 10, the motor rotor core and the motor stator core are aligned to ensure that the motor operates at maximum efficiency.

[0041] The oil inlet channel and oil outlet 213 of the static plate, together with the oil passage hole 214 of the wear pad, the oil passage ring groove 220 on the bearing seat, and the oil inlet groove 230 on the bearing seat, constitute the oil return channel of the pump body. The lubricating oil separated from the oil separator flows into the inner cavity of the bearing seat through the oil return channel.

[0042] The end cover is provided with six bolt through holes and two positioning holes. The centers of the six bolt through holes are located on the same circle (center circle 306 of the bolt through holes on the end cover) with the same diameter and the same distribution angle as the center circle of the six threaded holes on the end face of the motor housing (center circle 301 of the threaded holes on the motor housing). The two positioning holes are located on the same circle and have the same diameter and the same distribution angle as the center circle of the two positioning pin holes on the back of the stationary plate (center circle 302 of the positioning pin holes on the back of the stationary plate).

[0043] The circle containing the centers of the two locating pin holes on the bearing housing end face (center circle 305 of the bearing housing locating pin holes) has the same diameter as the circle containing the centers of the locating pin holes on the lower end face of the stationary plate (center circle 303 of the stationary plate end face locating pin holes) and the circle containing the centers of the two locating pin holes of the wear-resistant pad (center circle 304 of the wear-resistant pad locating holes); the circle containing the centers of the two locating pin holes on the upper end face of the stationary plate (center circle 302 of the stationary plate back locating pin holes) has the same diameter as the circle containing the two locating pin holes on the end face of the end cover (center circle 307 of the end cover locating holes); the circle containing the centers of the six bolt through holes on the end cover (center circle 306 of the end cover bolt through holes) has the same diameter as the circle containing the centers of the six threaded holes on the end face of the motor housing (center circle 301 of the motor housing threaded holes).

[0044] The centers of the inner circular surfaces of the second-step cavity 102, the third-step cavity 103, and the fourth-step cavity 104 of the motor housing, the center of the threaded hole on the end face of the motor housing located at the center of circle 301, the center of the two locating pin holes on the lower end face of the stationary plate located at the center of circle 303, the center of the two locating pin holes on the back of the stationary plate located at the center of circle 302, the center of the two locating pin holes of the wear-resistant pad located at the center of circle 304, the center of the two locating pin holes of the bearing seat located at the center of circle 305, the center of the locating pin hole of the end cover located at the center of circle 307, and the center of the six threaded through holes of the end cover located at the center of circle 306 all coincide with the center of the bearing hole of the first-step cavity of the motor housing.

[0045] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A structure for an electric scroll compressor under limited installation space, comprising a motor housing, end covers, end cover gaskets, bearing housings, bearing housing bearings, motor housing bearings, a motor shaft, a motor rotor, a motor stator, a stationary disc, and wear-resistant pads. The open end of the motor housing has a motor housing end face. The motor housing end face and the end cover are tightened and fixed together by multiple end cover fastening bolts. The end cover gasket is clamped and fixed between the motor housing end face and the end cover. The bearing housing and the stationary disc are sequentially installed from the inside out within the open end of the motor housing. A wear-resistant pad is provided between the bearing housing and the stationary disc. The bearing housing bearing is press-fitted into a bearing hole within the bearing housing cavity. The motor housing bearing is press-fitted into a bearing hole at the closed end of the motor housing. Both ends of the motor shaft are press-fitted into the inner holes of the bearing housing bearing and the motor housing bearing, respectively. The motor rotor is mounted on the motor shaft. The motor stator is assembled inside the motor housing. The characteristic feature is that: Multiple cylindrical bosses are provided on the end face of the open end of the motor housing. The multiple cylindrical bosses are distributed in a ring along the motor housing. Each cylindrical boss is provided with a threaded hole for the motor housing. The end cap fastening bolt is fitted into the threaded hole of the motor housing. The outer arc of the cylindrical boss protrudes radially outward from the outer surface of the motor housing, and the inner arc of the cylindrical boss protrudes radially inward from the inner cavity of the motor housing. The outer circular surface of the stationary plate is provided with a notch to avoid the inner arc of the cylindrical boss. The outer circle of the wear-resistant pad is provided with a notch to avoid the inner arc of the cylindrical boss. The outer circular surface of the bearing seat is provided with a notch to avoid the inner arc of the cylindrical boss. The cylindrical bosses form a circumferential positioning for the stationary plate, the wear-resistant pad, and the bearing seat.

2. The structure of an electric scroll compressor under limited installation space conditions according to claim 1, characterized in that: The wear-resistant pad is provided with an oil passage hole, and the lower end face of the stationary plate is provided with an oil outlet hole. The oil outlet hole of the stationary plate is connected to the oil inlet channel of the stationary plate and the oil passage hole of the wear-resistant pad. A connecting oil passage ring groove and an oil inlet groove are provided on the end face of the bearing housing. The oil inlet channel of the stationary plate is connected to the oil passage ring groove on the end face of the bearing housing. The oil inlet channel and oil outlet hole of the stationary plate, together with the oil passage hole of the wear-resistant pad, the oil passage ring groove on the bearing housing, and the oil inlet groove on the bearing housing, constitute the return oil channel of the pump body. The lubricating oil separated from the oil separator flows into the inner cavity of the bearing housing through the return oil channel.

3. The structure of an electric scroll compressor under limited installation space conditions according to claim 1, characterized in that: The inner cavity of the motor housing is provided with concentric first-step cavities, second-step cavities, third-step cavities, and fourth-step cavities. The fourth-step cavity has a boss at the center of its inner bottom surface, and the boss has a bearing hole for assembling the motor housing bearing. The third-step cavity is a cylindrical cavity, and the joint between the third-step cavity and the fourth-step cavity has a stator positioning step. The second-step cavity is a cylindrical cavity and is used to accommodate the lower part of the bearing seat and the upper part of the motor. The joint between the third-step cavity and the second-step cavity is an inclined surface, which is used to guide the assembly of the motor stator. The first-step cavity is a cylindrical cavity, and the joint between the first-step cavity and the second-step cavity has a bearing seat positioning step, which is used to position the bearing seat and the stationary plate.

4. The structure of an electric scroll compressor under limited installation space conditions according to claim 1, characterized in that: Two bearing housing positioning holes are provided on the end face of the bearing housing, and the two bearing housing positioning holes are distributed on a circle centered on the bearing housing axis. Two wear-resistant pad positioning holes are provided on the wear-resistant pad. The bearing housing and the stationary plate are connected and positioned by two stationary plate positioning pins inserted into the wear-resistant pad positioning holes and the bearing housing positioning holes. Two end cover positioning holes are provided on the end cover. Two stationary plate back positioning pin holes are provided on the back of the stationary plate. The stationary plate back positioning pin holes are used to assemble positioning pins and connect with the end cover. Two stationary plate end face positioning pin holes are provided on the end face of the stationary plate. The stationary plate end face positioning pin holes are used to assemble positioning pins and connect with the bearing housing.

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