JPH07158578A - Horizontal type electric compressor - Google Patents

Abstract

PURPOSE:To reliably ensure circulation of lubricating oil to a compression pump part without lowering the cooling efficiency of an electric motor part. CONSTITUTION:The rotor 31 of an electric motor part 3 is arranged on the intermediate part of a main shaft 1, a stator 32 is positioned facing the rotor on the outer periphery thereof with a gap 33 therebetween, and two housing spaces 1a and 1b axially partitioned away from each other are formed. A refrigerant delivered with the aid of a compression pump part 4 is fed in the space 1b in a housing through a refrigerant flow passage formed in a housing 1 wall and an outflow port 15 for a refrigerant flowing through a gap 33 between the rotor 31 and the stator 32 is opened to the space 1a in the housing. An oil flow passage 34 is formed in the bottom wall part of the housing 1 and lubricating oil L1 in the space 1a the oil level of which is raised owing to a pressure difference is circulated through the compression pump part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal electric compressor, and more particularly to improvement of a lubricating oil supply structure for a compression pump section thereof.

[0002]

2. Description of the Related Art An electric compressor having an electric motor unit for rotating a main shaft and a compression pump unit rotatably driven by the main shaft integrally provided in a housing is used for refrigerant compression of a vehicle air conditioner. In this case, the lubricating oil is supplied to the compression pump section in order to prevent its wear and maintain the airtightness during compression. The supply of the lubricating oil is usually made by a structure in which the lubricating oil stored on the bottom wall of the housing is sucked up by the negative suction pressure of the compression pump.

By the way, the refrigerant discharged from the compression pump portion is circulated to the electric motor portion so as to also cool the portion before being sent out from the outlet of the housing. In this case, the flow path of the discharged refrigerant flows into the housing space on the side closer to the compression pump portion, as described in JP-A-1-227896, for example. After passing through the gap between the rotor and the stator, the space reaches the inner space of the housing on the side farther from the compression pump unit, and the gas is delivered to the outside from the outlet port that opens here.

[0004]

However, in the structure described in the above publication, the internal pressure of the housing on the side closer to the compression pump portion increases, and the liquid level of the lubricating oil stored on the bottom wall of this portion is pushed down. Therefore, depending on the traveling posture of the vehicle or the like equipped with the compressor, the liquid level of the lubricating oil may become too low and the circulation of the lubricating oil to the compression pump portion may not be performed properly. Therefore, in the above publication, the refrigerant outlet is provided at an intermediate position on the outer circumference of the stator, and the lubricating oil liquid level in the housing on the side closer to the compression pump portion is set to the lubricating oil liquid in the housing on the side farther from the compression pump portion. A structure has been proposed in which the surface is raised to almost the same level. However, this also causes a problem that the liquid level rise of the lubricating oil is not sufficient and a part of the refrigerant directly reaching the outflow port does not contribute to the cooling of the electric motor section, so that the cooling effect is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a horizontal electric compressor capable of reliably ensuring the circulation of lubricating oil to the compression pump section without lowering the cooling efficiency of the electric motor section. And

[0006]

To explain the structure of the present invention, a main shaft 2 is supported horizontally in a housing 1, a compression pump unit 4 driven by the main shaft 2 is provided at one end of the main shaft 1, and the main shaft 1 is also provided. The motor part 3 that drives this in the middle part of
In the horizontal electric compressor provided with the rotor 31, the two housing internal spaces partitioned in the axial direction by the rotor 31 and the stator 32 that faces the rotor 31 with a gap 33 on the outer periphery of the rotor 31. 1a and 1b are formed, and the refrigerant discharged from the compression pump section 4 is supplied to the housing internal space 1b on the side far from the compression pump section 4 by the refrigerant flow paths 121 and 122 provided in the housing 1 wall. A gap 33 between the rotor 31 and the stator 32 and / or a gap 35, 36, 37, 3 between the housing 1 and the stator 32 is provided in the housing inner space 1a near the compression pump unit 4.
Open the outlet 15 of the refrigerant that has reached through 8, 39,
In addition, the oil passage 34 that connects the two housing inner spaces 1a and 1b is formed, and the lubricating oil L1 stored on the bottom wall of the housing inner space 1a on the side close to the compression pump portion 4 is stored in the compression pump portion 4 inside. It was made to circulate to.

[0007]

In the above structure, the refrigerant discharged from the compression pump section 4 reaches the internal space 1b of the housing through the refrigerant flow paths 121 and 122, and then passes through the gap 33 between the rotor 31 and the stator 32. It flows into the housing inner space 1 a and is sent out of the housing 1 through the outlet 15. The refrigerant causes pressure loss due to flow resistance when passing through the gap 33,
Therefore, the internal pressure of the housing internal space 1a becomes lower than the internal pressure of the housing internal space 1b. Space inside both housings 1
Since the lubricating oils L1 and L2 stored on the bottom walls of a and 1b communicate with each other through the oil passage 34, the pressure difference between the two spaces 1a and 1b pushes the lubricating oil L1 surface of the housing inner space 1a higher. .

However, since the lubricating oil surface of the housing inner space 1a circulated to the compression pump portion 4 becomes sufficiently high, a good lubricating oil can always be supplied even if the posture of the vehicle equipped with the compressor changes. Done. In addition, all the refrigerant is the gap 33,
35, 36, 37, 38, 39 to pass through the electric motor unit 3
Therefore, the cooling effect does not decrease.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a housing 1 of an electric compressor.
Is composed of front and rear housings 13 and 11 constituting both end walls, and a middle housing 12 located between them. Partition wall 221 of middle housing 12
The main shaft 2 is disposed in the housing 1 in a horizontal posture by being supported by the bearing 61 provided in the housing 1 and the bearing 62 provided in the central boss portion 231 of the front housing 13.

One end of the main shaft 2 has a large diameter, and an eccentric circular recess is formed in this end.
The central convex portion of the movable scroll member 41 constituting the above is fitted so as to be relatively rotatable. The movable scroll member 41 abuts a fixed scroll member 42 fixed in the rear housing 11, and a pump is provided between the spiral blades 411, 421 (FIG. 2) projecting from the facing surfaces of the scroll members 41, 42. A chamber 43 is formed. The rotation of the movable scroll member 41 is restricted by the rotation prevention pin 44, and the movable scroll member 41 revolves as the main shaft 2 rotates. And with this revolution,
Refrigerant is sucked into the pump chamber 43 from the suction port 14 on the top wall of the housing, compressed, and discharged from the discharge port 45 (white arrow in FIG. 1).

The discharge port 4 provided with a plate check valve 46.
Refrigerant sent out from the flow passage 5 passes through the rear housing 11 and the middle housing 12 to form the flow passages 121 and 122.
(FIGS. 2 and 3) and flows into the space 1b in the front housing 13.

In the middle housing 12, a cylindrical stator 32 which constitutes the electric motor section 3 is fixedly attached to the inner peripheral wall, and in the stator 32, a gap 33 is formed to form a cylindrical rotor 31. Is provided. The main shaft 2 penetrates the center of the rotor 31 and is fixed to the main shaft 2.

The inner space of the housing 1 is partitioned in the axial direction by the stator 32 and the rotor 31, and the space 1a is formed in the middle housing 12 between the partition wall 221 and the space 1b in the front housing 13. ing. As shown in FIG. 3, the stator 32 is formed with notches 34 and 35 of the same shape at the upper and lower positions of the outer periphery, and the remaining outer peripheral surface 4
Notches 36, 37, 38, 39 of the same shape are formed at the locations, and the notches 34 and parts of the notches 37, 38 are the same as the lubricating oil L1 in the space 1a stored on the bottom wall of the housing 1. It is an oil flow path that communicates the lubricating oil L2 in the space 1b. Also, the remaining portions of the notches 37 and 38 and the notches 35 and 3
Reference numerals 6 and 39 are refrigerant flow paths that connect the two spaces 1a and 1b.

In the lower half portion of the partition wall 221, as shown in FIG. 1, an oil circulation path 32 is bent along the partition wall 221 so as to have a substantially V-shape.
2 is formed, one end of which opens into the bottom wall of the housing 1 of the inner space 1a, and the other end of which opens into a through hole 21 which communicates with an annular groove on the outer circumference of the main shaft 2. An oil circulation path 22 is formed at the center of the main shaft 2 and communicates with the annular groove 21 and extends in the main shaft 2 toward the central convex portion of the movable scroll member 41. As shown by a black arrow in the drawing, an internal space is formed. The lubricating oil L1 stored on the bottom wall of 1a is supplied to the sliding portion by the differential pressure between the compression pump portion 4 and the suction side, that is, the sliding portion.

In the compressor having the above structure, the refrigerant discharged from the compression pump section 4 reaches the housing inner space 1b through the refrigerant flow paths 121 and 122. Then, the gap 33 between the rotor 31 and the stator 32, and the refrigerant flow paths 35, 3
After passing through 6, 37, 38, and 39, it flows into the housing inner space 1 a, and is sent out of the housing 1 through the outflow port 15.
The refrigerant causes a pressure loss due to the flow resistance when passing through the gap 32 and the refrigerant passages 35 to 39, so that the internal pressure of the housing internal space 1a becomes lower than the internal pressure of the housing internal space 1b. Lubricating oil L1 and L2 stored in the bottom walls of both housing inner spaces 1a and 1b are lubricating oil flow paths 34 and 3, respectively.
Since they are communicated with each other by 7, 38, the surface of the lubricating oil L1 in the housing inner space 1a is pushed up higher due to the pressure difference between the two spaces 1a, 1b.

However, the surface of the lubricating oil L1 in the housing inner space 1a circulating to the compression pump portion 4 becomes sufficiently high,
Even if the posture of the vehicle equipped with the compressor changes, the lubricating oil is always supplied well. In addition, all the refrigerant has a gap 3
2 and the refrigerant passages 35 to 39, the electric motor section 3 is effectively cooled.

In the above embodiment, the number of notches on the outer peripheral surface of the stator, which are the refrigerant flow paths, is determined by the pressure loss received by the refrigerant and
It is decided in consideration of the required height of the lubricating oil surface. Further, when only the gap between the stator and the rotor is sufficient for the passage of the refrigerant, the refrigerant passage need not be provided.

[0018]

As described above, according to the electric compressor of the present invention, the supply of lubricating oil to the compression pump portion can be reliably ensured and the electric motor portion can be sufficiently cooled.

[Brief description of drawings]

FIG. 1 is an overall sectional view of an electric compressor showing an embodiment of the present invention.

2 is a cross-sectional view of the electric compressor, which is a cross-sectional view taken along line II-II of FIG.

3 is a cross-sectional view of the electric compressor, which is a cross-sectional view taken along line III-III of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a, 1b Housing internal space 121, 122 Refrigerant flow path 2 Main shaft 3 Electric motor part 31 Rotor 32 Stator 33 Gap 34 Lubricating oil flow path 4 Compression pump L1, L2 Lubricating oil

Claims (1)

[Claims] 1. A horizontal shaft in which a main shaft is supported horizontally in a housing, a compression pump unit driven by the main shaft is provided at one end of the main shaft, and a rotor of an electric motor unit for driving the same is provided in an intermediate part of the main shaft. In a stationary electric compressor, the rotor and a stator located opposite to each other with a gap on the outer periphery of the rotor form two housing internal spaces partitioned in the axial direction, and the discharge from the compression pump unit is performed. The refrigerant
The refrigerant flow path provided in the housing wall supplies the refrigerant to the inner space of the housing on the side far from the compression pump section, and the inner space of the housing on the side close to the compression pump section is provided with It is stored on the bottom wall of the housing inner space on the side close to the compression pump part by opening the refrigerant outlet that has passed through the gap between them and forming an oil flow path that connects the two housing inner spaces. A horizontal electric compressor that circulates lubricating oil into the compression pump section.