JP3608401B2 - Scroll compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll compressor, and more particularly to a scroll compressor that is easily assembled.
[0002]
[Prior art]
An example of a conventional scroll compressor will be described with reference to the drawings. Referring to FIG. 12, in the scroll compressor, an electric motor 112 having a crankshaft 110 is disposed near the center in a sealed casing 102. An eccentric shaft portion 110 a is provided on the upper end side of the crankshaft 110. The eccentric shaft portion 110 a is inserted into a boss portion 106 b provided on the movable scroll 106. The movable scroll 106 is supported on the housing 108. A fixed scroll 104 is fixed on the housing 108. The fixed scroll 104 is provided with fixed scroll teeth 104a, and the movable scroll 106 is provided with movable scroll teeth 106a. A compression chamber is formed by meshing the fixed scroll teeth 104a and the movable scroll teeth 106a. The housing 108 is formed with a boss portion 106b, an eccentric shaft portion 110a, and a crank chamber 108a for housing a bearing 113 that supports the crankshaft 110.
[0003]
On the other hand, an oil sump 115 is provided on the lower end side of the crankshaft 110. The oil in the oil reservoir 115 is supplied to the sliding contact portion between the boss portion 106b and the eccentric shaft portion 110a, the bearing 113, and the like through an oil supply passage 110b formed in the crankshaft 110. The housing 108 is provided with an oil return pipe 116 for returning the oil that has been supplied to the sliding contact portion and the like to the oil reservoir 115. The conventional scroll compressor is configured as described above.
[0004]
[Problems to be solved by the invention]
In general, the above-described conventional scroll compressor is assembled as follows. First, the stator 112 a of the electric motor 112 is mounted inside the casing 102. Next, the housing 108 is attached. Next, the rotor 112b is mounted in the stator 112a, and the crankshaft 110 is pivotally supported by the bearing 113 and the bearing 114 provided in the housing. Thereafter, the movable scroll 106 and the fixed scroll 104 are disposed on the housing 108. Thus, the main part of the scroll compressor is completed.
[0005]
In the conventional scroll compressor, a bent oil return pipe 116 is attached to the housing 108. As shown in FIG. 12, the oil return pipe 116 has a portion extending from the crank chamber 108a toward the inner peripheral surface of the casing 102 and a portion extending toward the lower oil reservoir 115 along the inner peripheral surface. doing. As described above, since the oil return pipe 116 is a curved pipe, in assembling the scroll compressor, after the housing 108 is mounted in the casing 102, the stator 112a of the electric motor 112 becomes an obstacle and the housing The oil return pipe 116 cannot be attached to 108. For this reason, it is necessary to mount the housing 108 in the casing 102 in a state where the oil return pipe 116 bent in advance is mounted on the housing 108.
[0006]
In general, since the housing 108 is formed from a casting, the oil return pipe 116 is a component with a small weight compared to a relatively heavy component. For this reason, when the housing 108 is mounted in the casing 102 in a state where the oil return pipe 116 is mounted on the housing 108, the oil return pipe 116 is in contact with other parts previously mounted in the casing 102 and damaged. Therefore, it is necessary to carefully mount the heavy housing 108 in the casing 102. As a result, there is a problem that the workability of assembling the scroll compressor is poor and the manufacturing cost increases.
[0007]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a scroll compressor that is excellent in assembling workability and can reduce manufacturing costs.
[0008]
[Means for Solving the Problems]
The scroll compressor according to claim 1 for achieving the above object includes a casing, an electric motor, a bearing portion, a compression element, a housing, an oil sump portion, an oil supply passage, an oil return passage, It has a return oil pipe. The electric motor is disposed in the casing and has a main shaft. The bearing portion rotatably supports the upper end side of the main shaft. The compression element is provided on the upper end side of the main shaft via a crank portion. The housing supports the compression element from below and is formed with a crank chamber for housing the bearing portion and the crank portion. The oil reservoir is provided on the lower end side of the main shaft. The oil supply passage is provided in the main shaft, and supplies oil in the oil reservoir to the crank part and the bearing part. The oil return passage is provided in the housing and has a vertical hole on the side facing the oil reservoir near the outer peripheral surface in contact with the inner peripheral surface of the casing, and communicates the side facing the oil reservoir and the bottom of the crank chamber. ing. The oil return pipe is installed in a vertical hole, and includes a straight pipe for returning the oil after being supplied to the crank part or the bearing part to the oil reservoir. The vertical hole is formed from the upper end surface to the lower end surface of the housing so as to penetrate the housing. By pressing the oil return pipe into the vertical hole from the upper end surface side of the housing, the flange provided on the upper end side of the oil return pipe is received from below by the receiving portion provided on the lower end surface side of the housing, and the oil return pipe is It is installed in the vertical hole without any gaps.The oil return passage includes a first horizontal hole that passes through the vertical hole and intersects the vertical hole, and the first horizontal hole penetrates the housing through the vertical hole from the outer peripheral surface side of the housing. It is formed over the bottom side of the chamber, and the open end of the first lateral hole on the outer peripheral surface side of the housing is closed by the casing.
[0009]
According to this configuration, there is a vertical hole on the side facing the oil reservoir near the outer peripheral surface of the housing in contact with the inner peripheral surface of the casing, and the return side that communicates the side facing the oil reservoir with the bottom of the crank chamber. Since the oil passage is provided in the housing, the oil return pipe for returning the oil that has been supplied to the crank portion or the bearing portion to the oil sump portion is a straight line attached to the vertical hole of the oil return passage. It is possible to return oil with an oil return pipe made of piping. In the assembly of the scroll compressor, after mounting the housing in the casing, one end of the oil return pipe made of straight piping is connected to the housing along the inner peripheral surface of the casing in parallel with the main shaft using the vertical hole as a guide. By press-fitting into the vertical hole from the upper end side, the flange provided on the upper end side of the oil return pipe is received from below by the receiving part provided on the lower end surface side of the housing, and the oil return pipe is installed in the vertical hole without any gaps Will be. As a result, unlike the conventional scroll compressor, there is no need to mount the housing in the casing with the oil return pipe mounted in advance on the housing, and when the oil return pipe is press-fitted from the lower end surface side of the housing. Compared to the above, there is no obstacle such as an electric motor, and the oil return pipe can be easily attached to the housing, so that the manufacturing cost can be reduced.Further, the oil return passage includes a first horizontal hole that passes through the vertical hole and intersects the vertical hole, and the first horizontal hole passes through the vertical hole from the outer peripheral surface side of the housing so as to penetrate the housing, The opening end of the first lateral hole on the outer peripheral surface side of the housing is closed by the casing. Thus, in forming the oil return passage, in addition to being able to easily form the vertical hole from the side facing the oil reservoir of the housing, the first horizontal hole is machined from the outer peripheral surface of the housing to the bottom of the crank chamber. Can be easily formed. As a result, the manufacturing cost of the scroll compressor can be further reduced. Moreover, since the open end of the outer peripheral surface of the housing is easily closed by the casing, the oil does not leak and the oil can be reliably returned to the oil reservoir through the oil return pipe.
[0010]
In the scroll compressor according to the second aspect, the oil return pipe is opened in the vicinity of the oil reservoir through the gap between the casing and the electric motor.
[0011]
In this case, the oil flowing down from the oil return pipe can be reliably returned to the oil reservoir without being attached to, for example, an electric motor.
[0016]
Claim3In the scroll compressor described in 1), the oil return pipe is made of copper, and the upper end portion of the oil return pipe is fixed to the housing by an iron bush.
[0017]
When the oil return pipe is made of copper, annealing occurs, so that a gap is formed between the oil return pipe and the vertical hole of the housing, and the oil return pipe may come out of the housing. Therefore, by pressing the iron bush into the vertical hole, the copper oil return pipe is more firmly fixed to the housing, and the oil return pipe can be prevented from falling off the housing.
[0018]
Claim4In the scroll compressor described, the lower end side of the oil return pipe is fixed by a fixing member provided in the casing.
[0019]
In this case, since the lower end side of the oil return pipe is fixed, it is possible to prevent the oil return pipe from vibrating during the operation of the scroll compressor.
[0020]
Claim5In the scroll compressor described in the above, the fixing member is formed of a plastic member and has an opening for receiving the oil return pipe having a diameter larger than that of the oil return pipe, and the oil return pipe is surrounded by the opening. Convex portions extending toward the center of the opening for supporting from the direction are formed radially.
[0021]
In this case, when the lower end of the oil return pipe is fixed to the fixing member, the lower end portion can be easily inserted into the opening of the fixing member even if the axial center of the oil return pipe is slightly displaced. . And since the convex part of a fixing member is bent toward that direction by inserting the oil return pipe, the oil return pipe is not pulled back easily and can be fixed more firmly.
[0022]
Claim6In the scroll compressor described in the above, the oil return passage further includes a second horizontal hole that communicates the side surface of the crank chamber and the vertical hole at a position higher than the upper end surface of the bearing portion mounted in the crank chamber. Yes.
[0023]
In this case, even if excess oil accumulates beyond the upper end of the bearing portion, the oil can be returned to the lower oil reservoir portion via the second lateral hole. As a result, excessive oil does not exist in the crank chamber, and the drive loss of the scroll compressor can be reduced.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Reference example1
Reference exampleA scroll compressor according to No. 1 will be described with reference to the drawings. Referring to FIG. 1, an electric motor 12 having a crankshaft 10 is disposed in a casing 2 of the scroll compressor. The upper end side and the lower end side of the crankshaft 10 are rotatably supported by an upper bearing 13 and a lower bearing 14, respectively. An eccentric shaft portion 10 a is provided on the upper end side of the crankshaft 10 and is inserted into the boss portion 6 b of the movable scroll 6. The movable scroll 6 is provided with movable scroll teeth 6a. The fixed scroll 4 is provided with fixed scroll teeth 4a. The movable scroll teeth 6a and the fixed scroll teeth 4a mesh with each other to form a compression element.
[0025]
The movable scroll 6 and the fixed scroll 4 are supported by the housing 8 from below. The housing 8 is formed with a crank chamber 8 a for accommodating the upper bearing 13, the eccentric shaft portion 10 a and the boss portion 6 b of the movable scroll 6. As shown in FIG. 2 or 3, the housing 8 has a lower lateral through hole 20a that communicates the bottom of the crank chamber 8a below the upper bearing 13 and the outer peripheral surface of the housing 8 that contacts the inner peripheral surface of the casing 2. Is formed. Further, in the vicinity of the outer peripheral surface of the housing 8, a vertical hole 20 b is formed to communicate the side facing the oil reservoir 15 and the lower horizontal through hole 20 a. The vertical hole 20b is fitted with an oil return pipe 16 made of a straight pipe toward an oil reservoir 15 provided on the lower end side of the crankshaft 10.
[0026]
In the operation of the scroll compressor described above, as in the prior art, the movable scroll 6 revolves with respect to the fixed scroll 4 via the eccentric shaft portion 10a as the crankshaft 10 of the electric motor 12 rotates. The compression operation is performed. During the operation of the scroll compressor, the oil in the oil reservoir 15 is supplied to the sliding portion between the upper bearing 13 and the eccentric shaft portion 10a and the boss portion 6b through the oil supply passage 10b formed in the crankshaft 10. . The oil after being supplied is returned to the oil reservoir 15 through the oil return passage 20 and the oil return pipe 16 formed in the housing 8.
[0027]
As described above, the oil return passage 20 of the scroll compressor includes the lower horizontal through hole 20a and the vertical hole 20b as shown in A in FIG. The lower lateral through hole 20a is easily formed by machining in advance from the outer peripheral surface side of the housing 8 toward the bottom of the crank chamber 8a. The vertical hole 20b is also easily formed by machining from the side (lower side) facing the oil reservoir 15 of the housing 8 toward the lower horizontal through hole 20a. And the oil return pipe 16 with which the vertical hole 20b was mounted | worn consists of linear piping.
[0028]
Thus, in the assembly work of the scroll compressor, after mounting the relatively heavy housing 8 in the casing 2 in advance, the upper end of the oil return pipe 16 extends from the motor 12 side along the inner peripheral surface of the casing 2. The oil return pipe 16 can be easily attached to the housing 8 by being press-fitted into the vertical hole 20 b in parallel with the crankshaft 10. As a result, as in the case of the conventional scroll compressor, it is not necessary to carefully mount the housing 8 in the casing 2 in a state where the bent oil return pipe is previously mounted on the housing, and the assembly work becomes easier. The manufacturing cost can be reduced by shortening the construction period.
[0029]
The oil return passage 20 communicates with the side facing the oil reservoir 15 and the bottom of the crank chamber 8a, and vertically extends to the side facing the oil reservoir 15 in the vicinity of the outer peripheral surface of the housing 8 in contact with the inner peripheral surface of the casing 2. As long as the hole 20b is provided, the oil return passage 20 is not limited to the above, and after the housing 8 is mounted in the casing 2, the oil return pipe 16 formed of a straight pipe is easily press-fitted into the vertical hole 20b. Can be installed.
[0030]
In particular, the bookReference exampleThen, since the lower horizontal through-hole 20a is formed by machining from the outer peripheral surface side of the housing 8 as a horizontal hole communicating the vertical hole 20b and the bottom of the crank chamber 8a, it can be easily formed. In addition, the opening end of the lower lateral through hole 20a on the outer peripheral surface side of the housing 8 is closed by the casing 2, so that the oil can be reliably returned to the oil reservoir 15 without leaking.
[0031]
Further, even when the oil return pipe 16 is opened in the vicinity of the oil sump 15 through the gap between the casing 2 and the electric motor 12, the oil flowing down from the oil return pipe 16 does not adhere to the electric motor 12 or the like. The oil sump 15 can be reliably returned.
[0032]
Reference example2
Reference exampleA scroll compressor according to No. 2 will be described with reference to the drawings. Referring to FIG. 4, a vertical penetration 20 c is formed in the housing 8 of the scroll compressor from the upper end surface to the lower end surface of the housing 8 so as to penetrate the housing 8 as shown in A in the figure. ing. Since the configuration other than this is the same as that of the scroll compressor shown in FIG. 1 described in Reference Example 1, the same members are denoted by the same reference numerals, and the description thereof is omitted.
[0033]
In the above scroll compressor, after assembling the housing 8 in the casing 2, the oil return pipe 16 is press-fitted from the upper end side of the vertical through hole 20 c provided in the housing 8, thereby Installed. In addition, since the vertical through hole 20c has an appropriate length, it can serve as a guide and the oil return pipe 16 can be easily arranged at a predetermined position.Reference example1, when the oil return pipe 16 is press-fitted from the side of the housing 8 facing the oil reservoir 15, the oil return pipe 16 needs to be passed through a narrow gap between the stator 12 a of the electric motor 12 and the casing 2. is there. On the other hand, in this scroll compressor, since it press-fits from the upper end side of the housing 8, the oil return pipe 16 can be easily attached to the housing 8 without such a situation. As a result, the assembly of the scroll compressor is further facilitated, and the manufacturing cost can be reduced.
[0034]
Embodiment
Embodiment of the present inventionStateSuch a scroll compressor will be described with reference to the drawings. Referring to FIG. 5, the oil return pipe 16 of the scroll compressor is made of copper, and the upper end of the oil return pipe 16 is fixed to the housing 8 by an iron bush 17 as shown in A in the figure. ing. That is, as shown in FIG. 6, after the oil return pipe 16 is press-fitted from the upper end of the vertical through hole 20 c of the housing 8 mounted in the casing 2, the iron bush 17 is press-fitted and the upper end of the oil return pipe 16 is inserted. Is fixed to the housing 8. For other configurations,Reference exampleSince the configuration of the scroll compressor shown in FIG. 4 described in FIG.
[0035]
When the oil return pipe 16 is made of copper, a creep phenomenon that eliminates residual stress occurs due to copper annealing due to heat during operation, so a gap is formed between the oil return pipe 16 and the vertical through hole 20c. Oil may leak. Moreover, the oil return pipe 16 may fall out of the vertical through hole 20c. Therefore, this is prevented by press-fitting an iron bush 17. When the oil return pipe 16 is made of iron, the annealing of iron is not as noticeable as in the case of copper, so that it is not necessary to press-fit the bush 17 in particular.The scroll compressor according to the present embodiment has the configuration of the scroll compressor described in Reference Example 2 except that the upper end of the oil return pipe 16 is fixed to the housing 8 by an iron bush 17. Thus, an effect that the oil return pipe 16 can be easily attached to the housing 8 is obtained. Similarly to the case of Reference Example 1, the oil return pipe 16 passes through the gap between the casing 2 and the electric motor 12 and opens in the vicinity of the oil sump 15 so that the oil flowing down from the oil return pipe 16 is The oil can be reliably returned to the oil sump 15 without being attached to the electric motor 12 or the like. You may fix the lower end of the oil return pipe 16 using the fixing tool 18 described in the reference example 3 mentioned later, or the fixing tool 19 described in the reference example 4. FIG. Thereby, it is possible to prevent the oil return pipe 16 from vibrating during operation of the scroll compressor. Further, in addition to the lower horizontal through hole 20 a formed in the housing 8, an upper through hole 20 d described in Reference Example 5 may be formed. Thereby, the oil accumulated excessively in the crank chamber 8a can be returned to the oil reservoir 15 through the upper through hole 20d.
[0036]
Reference example 3
Reference example 3A scroll compressor according to the above will be described with reference to the drawings. Referring to FIG. 7, the lower end of the oil return pipe 16 of the scroll compressor is fixed to the casing 2 by a fixture 18 as shown in B in the figure. For other configurations,Reference example1 is the same as the configuration of the scroll compressor shown in FIG. 1 described in FIG.
[0037]
According to this scroll compressor,Reference exampleIn addition to the ease of assembly described in 1 above, the following effects can be obtained. That is, by fixing the lower end of the oil return pipe 16, it is possible to prevent the oil return pipe 16 from vibrating during the operation of the scroll compressor. As a result, it is possible to prevent problems such as noise generated when the oil return pipe 16 contacts the casing 2 and vibrations of the oil return pipe 16 causing the oil return pipe 16 to fall out of the vertical hole 20b.
[0038]
Reference example 4
Reference example 3Then, the lower end of the oil return pipe 16 was fixed to the casing 2 by the fixture 18. BookReference exampleIn the scroll compressor according to the present invention, a case where a fixture 19 with a slit is applied as the fixture will be described. Referring to FIG. 8, the lower end of the oil return pipe 16 of the scroll compressor is fixed by a fixture 19 with a slit as shown in B in FIG.
[0039]
The fixture 19 with a slit is formed, for example from spring steel. As shown in FIGS. 9 and 10, the slitted fixture 19 has an opening 19 a having a diameter larger than the diameter of the oil return pipe 16. In the opening 19a, convex portions 19b extending radially toward the center of the opening 19a are radially provided so that the oil return pipe 16 can be bent appropriately in the direction in which the oil return pipe 16 is inserted and supported from the circumferential direction. Is arranged. The diameter of the circle obtained by connecting the tips of the convex portions 19 b is smaller than the diameter of the oil return pipe 16.
[0040]
According to this scroll compressor,Reference exampleIn addition to the ease of assembly described in 1 above, the following effects can be obtained. That is, the convex portion 19b of the fixing tool 19 with the slit holds the oil return pipe 16 from the circumferential direction in a state of being bent appropriately in the insertion direction of the oil return pipe 16, so that the oil return pipe 16 is easily pulled back. It will not be. Further, when the oil return pipe 16 is inserted into the opening 19a, the opening diameter of the opening 19a is larger than the diameter of the oil return pipe 16, even if the position of the axial center of the oil return pipe 16 is slightly shifted. The oil return pipe 16 can be reliably caught and supported. Such a fixture 19 with a slit and the fixture 18 are desirably provided in the casing 2 and the lower bearing 14.
[0041]
The aboveReference exampleThen, although the spring steel was mentioned as an example as the fixing tool 19 with a slit, if it consists of plastic members, such as resin, the effect similar to a spring steel can be acquired. Moreover, according to the fixing tool 19 with such a slit, this bookReference exampleThe lower end of the bent oil return pipe 116 used in the conventional scroll compressor can be easily fixed.
[0042]
Reference Example 5
Reference Example 5A scroll compressor according to the above will be described with reference to the drawings. Referring to FIG. 11, the housing 8 of the scroll compressor has a side surface of the crank chamber 8a and a vertical hole 20b at a position higher than the upper end surface of the upper bearing 13, as shown in A in FIG. An upper horizontal through hole 20d that communicates is formed. For other configurations,Reference example1 is the same as the configuration of the scroll compressor shown in FIG. 1 described in FIG.
[0043]
Similar to the lower lateral through hole 20a, the upper lateral through hole 20d is easily formed by machining in advance from the outer peripheral surface side of the housing 8 toward a predetermined position of the crank chamber 8a.
[0044]
According to this scroll compressor,Reference exampleIn addition to the ease of assembly described in 1 above, the following effects can be obtained. That is, when the upper lateral through hole 20d is formed in the housing 8, if the oil supplied from the oil reservoir 15 excessively accumulates in the crank chamber 8a beyond the upper end surface of the upper bearing 13, the excess The oil can be returned to the oil sump 15 from the upper horizontal through hole 20 d through the vertical hole 20 b and the oil return pipe 16. As a result, when the crank portion 10a is driven, it is possible to reduce the drive loss of the scroll compressor caused by excessive oil in the crank chamber 8a becoming a resistance.
[0045]
The aboveReference exampleThen, instead of the vertical hole 20b formed in the housing 8, a vertical through hole 20c as shown in FIG. 4 may be applied. Moreover, you may fix the lower end of the oil return pipe 16 using the fixing tool 18 and the fixing tool 19 with a slit, as shown in FIG.7 and FIG.8.
[0046]
The embodiments disclosed herein are illustrative in all respects and should not be construed as being restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0047]
【The invention's effect】
According to the scroll compressor according to claim 1, the side facing the oil reservoir near the outer peripheral surface of the housing in contact with the inner peripheral surface of the casing has a vertical hole, and the side facing the oil reservoir and the crank Since the housing is provided with an oil return passage that communicates with the bottom of the chamber, the oil return pipe for returning the oil that has been supplied to the crank portion or the bearing portion to the oil reservoir portion is It is possible to return oil with an oil return pipe comprising a straight pipe mounted in the hole. In the assembly of the scroll compressor, after the housing is mounted in the casing, one end of the oil return pipe made of a straight pipe is connected to the housing along the inner peripheral surface of the casing in parallel with the main shaft using the vertical hole as a guide. By press-fitting into the vertical hole from the upper end side, the flange provided on the upper end side of the oil return pipe is received from below by the receiving part provided on the lower end surface side of the housing, and the oil return pipe is installed in the vertical hole without any gaps Will be. As a result, unlike conventional scroll compressors, there is no need to install the housing in the casing with the oil return pipe already installed in the housing, and when the oil return pipe is press-fitted from the lower end side of the housing. Compared to the above, there is no obstacle such as an electric motor, and the oil return pipe can be easily attached to the housing, so that the manufacturing cost can be reduced.Further, the oil return passage includes a first horizontal hole that passes through the vertical hole and intersects the vertical hole, and the first horizontal hole passes through the vertical hole from the outer peripheral surface side of the housing so as to penetrate the housing, The opening end of the first lateral hole on the outer peripheral surface side of the housing is closed by the casing. Thereby, in forming the oil return passage, in addition to being able to easily form the vertical hole from the side facing the oil reservoir of the housing, the first horizontal hole is machined from the outer peripheral surface of the housing to the bottom of the crank chamber. Can be easily formed. As a result, the manufacturing cost of the scroll compressor can be further reduced. Moreover, since the open end of the outer peripheral surface of the housing is easily closed by the casing, oil does not leak and the oil can be reliably returned to the oil reservoir through the oil return pipe.
[0048]
In the scroll compressor according to claim 2, the oil returning pipe passes through a gap between the casing and the electric motor and is opened in the vicinity of the oil reservoir, so that the oil flowing down from the oil returning pipe adheres to the electric motor, for example. It is possible to reliably return to the oil sump without causing it to occur.
[0051]
Claim3In the scroll compressor described in, the oil return pipe is made of copper. In this case, since the upper end portion of the oil return pipe is fixed to the housing by the iron bush, it is possible to prevent the copper oil return pipe from being annealed and falling out of the housing.
[0052]
Claim4In the scroll compressor described in the above, the lower end side of the oil return pipe is fixed by a fixing member provided in the casing, so that the oil return pipe can be prevented from vibrating during operation of the scroll compressor. .
[0053]
Claim5In the scroll compressor described in the above, the fixing member is formed of a plastic member and has an opening for receiving the oil return pipe having a diameter larger than that of the oil return pipe, and the oil return pipe is surrounded by the opening. When the lower end of the oil return pipe is fixed to the fixing member, the position of the axis of the oil return pipe is fixed by forming the convex part extending toward the center of the opening to support from the direction radially. Can be easily inserted into the opening of the fixing member. And since the convex part of a fixing member is bent toward that direction by inserting the oil return pipe, the oil return pipe is not pulled back easily and can be fixed more firmly.
[0054]
Claim6In the scroll compressor described in the above, the oil return passage further includes a second horizontal hole that communicates the side surface of the crank chamber and the vertical hole at a position higher than the upper end surface of the bearing portion attached to the crank chamber. Therefore, even if excess oil accumulates beyond the upper end of the bearing portion, the oil can be returned to the lower oil reservoir portion via the second lateral hole. As a result, excessive oil does not exist in the crank chamber, and the drive loss of the scroll compressor can be reduced.
[Brief description of the drawings]
[Figure 1]Reference example1 is a longitudinal sectional view of a scroll compressor according to FIG.
[Figure 2]Reference exampleFIG. 2 is a side view transparently showing the structure of the housing shown in FIG.
[Figure 3]Reference exampleFIG. 2 is a plan view transparently showing the structure of the housing shown in FIG. 1.
[Fig. 4]Reference example2 is a longitudinal sectional view of a scroll compressor according to FIG.
FIG. 5 shows an embodiment of the present invention.StateIt is a longitudinal cross-sectional view of the scroll compressor which concerns.
6 is a partial enlarged cross-sectional view of A shown in FIG. 5 in the same embodiment. FIG.
[Fig. 7]Reference example 3It is a longitudinal cross-sectional view of the scroll compressor concerning.
[Fig. 8]Reference example 4It is a longitudinal cross-sectional view of the scroll compressor concerning.
FIG. 9Reference exampleFIG. 9 is a side view of the fixture with slits shown in FIG. 8.
Fig. 10Reference exampleFIG. 9 is a plan view of the fixture with slits shown in FIG. 8.
FIG. 11Reference Example 5It is a longitudinal cross-sectional view of the scroll compressor concerning.
FIG. 12 is a longitudinal sectional view of a conventional scroll compressor.
[Explanation of symbols]
2 Casing
4 Fixed scroll
4a Fixed scroll teeth
6 Moveable scroll
6a Movable scroll tooth
6b Boss
8 Housing
8a Crank chamber
10 Crankshaft
10a Eccentric shaft
10b Oil supply passage
12 Electric motor
12a Stator
13 Upper bearing
14 Lower bearing
15 Oil sump
16 Oil return pipe
17 Bush
18 Fixing tool
19 Fixture with slit
19a opening
19b Convex part
20 Oil return passage
20a Lower horizontal through hole
20b Vertical hole
20c vertical through hole
20d Upper horizontal through hole

Claims (6)

A casing (2) and an electric motor (12) disposed in the casing (2) and having a main shaft (10);
A bearing portion (13) that rotatably supports the upper end side of the main shaft (10);
Compression elements (4, 6) provided on the upper end side of the main shaft (10) via a crank portion (10a);
A housing (8) for supporting the compression element (4, 6) from below and having a crank chamber (8a) for accommodating the bearing portion (13) and the crank portion (10a);
An oil reservoir (15) provided on the lower end side of the main shaft (10);
An oil supply passage (10b) provided in the main shaft (10) for supplying the oil in the oil reservoir (15) to the crank portion (10a) and the bearing portion (13);
A vertical hole (20b, 20c) is provided on the side facing the oil reservoir (15) in the vicinity of the outer peripheral surface provided in the housing (8) and in contact with the inner peripheral surface of the casing (2), and the oil reservoir An oil return passage (20) communicating the side facing the portion (15) and the bottom of the crank chamber (8a);
From a straight pipe for returning the oil after being supplied to the crank part (10a) or the bearing part (13) to the oil reservoir part (15), which is attached to the vertical holes (20b, 20c). An oil return pipe (16)
The vertical hole (20c) is formed from the upper end surface to the lower end surface of the housing (8) so as to penetrate the housing (8),
By pressing the oil return pipe (16) into the vertical hole (20c) from the upper end surface side of the housing (8), a flange provided on the upper end side of the oil return pipe (16) becomes the housing (8 ) Is received from below by a receiving portion provided on the lower end surface side, and the oil return pipe (16) is attached to the vertical hole (20c) without a gap ,
The oil return passage (20) includes a first horizontal hole (20a) that communicates with the vertical holes (20b, 20c) and intersects the vertical holes (20b),
The first lateral hole (20a) passes through the vertical hole (20b, 20c) from the outer peripheral surface side of the housing (8) so as to pass through the housing (8), and then the crank chamber (8a). Formed over the bottom side,
The scroll compressor by which the opening end in the outer peripheral surface side of the said housing (8) of the said 1st horizontal hole (20a) is closed by the said casing (2) . The scroll compressor according to claim 1, wherein the oil return pipe (16) opens in the vicinity of the oil reservoir (15) through a gap between the casing (2) and the electric motor (12). The oil return pipe (16) is made of copper,
The scroll compressor according to claim 1 or 2, wherein an upper end portion of the oil return pipe (16) is fixed to the housing (8) by an iron bush (17) . The scroll compressor according to any one of claims 1 to 3 , wherein a lower end side of the oil return pipe (16) is fixed by a fixing member (18, 19) provided in the casing (2) . The fixing member (19) is formed of a plastic member,
An opening (19a) for receiving the oil return pipe (16) having a larger diameter than the oil return pipe (16);
The opening (19a) is radially formed with convex portions (19b) extending toward the center of the opening (19a) for supporting the oil return pipe (16) from the circumferential direction. The scroll compressor according to claim 4 . The oil return passage (20) includes a side surface of the crank chamber (8a) at a position higher than an upper end surface of the bearing portion (13) attached to the crank chamber (8a) and the vertical holes (20b, 20c). ) and further comprising a second lateral hole communicating (20d), the scroll compressor according to claim 1-5 Neu Zurekani described.

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