JP2003129960A - Accumulator integrated compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure causing no heat loss in a refrigerant supply passage from an accumulator part A to a compression mechanism part C and provide a secure oil supply structure causing no liquid compression and running out of oil in the structure. SOLUTION: This structure is constituted inside a pressure proof sealed vessel 10 through the refrigerant supply passage from the accumulator part A to the compression mechanism part C. Moreover, a refrigerant introduction pipe 42 having an oil suction hole 42b and a supply passage part having such shape that is extended onto a top side in the direction of top and bottom once from the oil suction hole 42b is provided in the accumulator part A to eliminate heat loss by heat exchange with external atmosphere in the refrigerant supply passage. Furthermore, oil does not drop freely from the oil suction hole 42b even when a compressor is stopped in a configuration in which the accumulator part A is arranged above the compression mechanism part C to prevent liquid compression when starting the operation and running out of oil in order to supply oil securely during operation.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an accumulator-integrated compressor used in a refrigeration cycle.

[0002]

2. Description of the Related Art Conventionally, JP-A-61-272478, JP-A-6-66258, and JP-A-2000-33.
Japanese Patent No. 7737 discloses a structure of a compressor which is integrated with an accumulator.

[0003]

However, in each of the accumulator-integrated compressors disclosed in the above publications, the accumulator section and the electric compression mechanism section are integrated, but the accumulator section to the compression mechanism section is integrated. The refrigerant supply path has a structure that surrounds the outside of the compressor body, and when this refrigerant supply path passes outside the compressor, heat dissipation and heat absorption occur with the external atmosphere, resulting in heat loss,
It is a factor that reduces efficiency.

Further, in the structure disclosed in Japanese Patent Laid-Open No. 61-272478, the accumulator section is arranged in the upper part, and when the compressor is stopped, the lubricating oil freely falls from the accumulator section and collects in the compression mechanism section. In order to prevent liquid compression at the time of start-up, there is usually no oil suction hole provided in the refrigerant introduction pipe in the accumulator for sucking and supplying separated oil together with the refrigerant. For this reason, it is difficult to reliably supply the lubricating oil to the compression mechanism section.

On the other hand, in the structures disclosed in JP-A-6-66258 and JP-A-2000-337737, the accumulator portion is arranged in the lower part, and the separated oil is introduced into the refrigerant introduction pipe in the accumulator. An oil suction hole for sucking together with the refrigerant is provided. However, when the compressor is stopped, conversely to the above, the lubricating oil may freely fall from the compression mechanism unit and return to the accumulator unit, causing lubrication failure due to oil shortage at the time of startup.

The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide an accumulator-integrated structure which does not cause heat loss in the refrigerant supply path from the accumulator section to the compression mechanism section. To provide, second
The purpose of is to provide a reliable oil supply structure that neither causes liquid compression nor oil shortage in the accumulator integrated structure.

[0007]

In order to achieve the above object, the present invention employs the following technical means.

According to the first aspect of the invention, the entire refrigerant supply path from the accumulator section (A) to the compression mechanism section (C) is formed inside the pressure-resistant airtight container (10) and is not exposed to the outside. Is characterized by. As a result, heat loss due to heat exchange with the external atmosphere in the refrigerant supply path can be eliminated, and an efficient compressor can be obtained.

According to the second aspect of the present invention, as a part of the refrigerant supply path, the accumulator section (A) has an oil suction section (42b), and the oil suction section (42b) temporarily turns upside down. It is characterized in that a coolant introducing portion (42) having a supply path portion extending in the direction of the arrow is provided.

As a result, even if the compressor is stopped with the structure in which the accumulator section (A) is arranged above the compression mechanism section (C), the oil from the oil suction section (42b) is free to the compression mechanism section (C). It does not drop, and it is possible to prevent liquid compression and oil shortage at startup, and to ensure reliable oil supply during operation.

According to a third aspect of the invention, the accumulator section (A) is formed between the compression mechanism section (C) and the motor section (M). As a result, a part of the space of the motor unit (M) can be used as the accumulator unit (A), so that the entire compressor can be downsized.

The invention according to claim 4 is characterized in that the compression mechanism portion (C), the motor portion (M), and the accumulator portion (A) are horizontally arranged. This increases the degree of freedom in disposing the compressor using the present invention in a vehicle, an outdoor unit, or the like. Incidentally, the reference numerals in parentheses of the above-mentioned respective means are examples showing the corresponding relationship with the concrete means described in the embodiments described later.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram of an accumulator-integrated compressor (hereinafter, referred to as a first embodiment of the present invention).
Abbreviated as compressor. ) Is a cross-sectional view of FIG. Figure 1 shows the refrigeration cycle
And 100 is a compressor according to the present invention,
Reference numeral 200 is a radiator for radiating heat from the high-temperature and high-pressure refrigerant discharged from the compressor 100. 300 is a decompressor for decompressing the refrigerant flowing out from the radiator 200, and 400 is an evaporator for evaporating the refrigerant decompressed by the decompressor 300.

Next, the structure of the compressor 100 will be described with reference to sectional views. In the compressor 100, a pressure-resistant airtight container 10 is formed by joining an upper casing 12 and a lower casing 13, which are also made of metal such as iron, to both ends of a cylindrical casing 11 made of an iron pipe by welding.

The inside is roughly divided into a compression mechanism section C for compressing the refrigerant, a motor section M for driving the compression mechanism section C, and the refrigerant flowing from the previous evaporator 400 into a liquid phase refrigerant and a gas phase refrigerant. It is composed of an accumulator section A that separates and supplies only the gas-phase refrigerant to the suction side of the compression mechanism section C, and stores the excess refrigerant in the cycle. The accumulator section A is the top side in the vertical direction, and the motor section below it. M and the compression mechanism portion C are arranged on the ground side in the vertical direction.

The compression mechanism portion C is a well-known scroll type compression mechanism composed of an orbiting scroll 21, a fixed scroll 22, and the like, and 20 is a compressor housing for accommodating movable portions such as the orbiting scroll 21 and the like. These are also made of metal such as iron, and after combined, the compressor housing 2
0 and the fixed scroll 22 are fixed by bolts (not shown).

A DC brushless motor 30 (hereinafter abbreviated as a motor) is housed in the motor section M. The motor 30 includes a stator 31 including a stator core and windings.
And the magnet rotor 3 rotating in the stator 31.
2 and are configured.

One end side of the rotor shaft 33 supporting the magnet rotor 32 in the longitudinal direction penetrates the compressor housing 20 and is connected to the orbiting scroll 21, and is rotatable by a radial bearing 34 fixed to the compressor housing 20. Is held. On the other hand, the other end of the rotor shaft 33 is connected to the motor housing 3
It is rotatably held by a radial bearing 36 fixed to 5.

In the accumulator section A, there is fixed a collision plate 41 for separating the gas-liquid by causing the gas-liquid two-layer refrigerant flowing from the suction port 14 to collide with the refrigerant. A plurality of holes are formed on the outer periphery of the collision plate 41, and the liquid refrigerant separated from the gas and liquid falls from the holes into the space below. Then, in the center of the space below it, a refrigerant introducing pipe 42 as a refrigerant introducing means for introducing the gas refrigerant separated into gas and liquid into the compression mechanism portion C is installed, and an opening at the upper end face is a refrigerant as a refrigerant suction portion. Suction port 42
It is a.

The refrigerant introducing pipe 42 has a substantially horizontal S shape, and an oil suction hole 42b as an oil suction portion is opened at a portion near the motor housing 35 at the lower end of the bent portion, and the accumulator portion A is formed. The oil in the liquid refrigerant accumulated inside is sucked from this hole together with the gas refrigerant sucked from the refrigerant suction port 42a, and is supplied to the compression mechanism portion C.
The upper casing 12 is provided with an electric terminal portion 37 for supplying electric power to the motor 30.

Next, the flow of the refrigerant will be described.

The upper casing 12 has a suction port 14 for introducing the refrigerant flowing out of the evaporator 400 into the closed container 10. The gas-liquid two-layer refrigerant that has flowed into the closed container 10 through the suction port 14 first collides with the collision plate 41 in the accumulator portion A and is separated into gas and liquid. And the refrigerant introduction pipe 4
The gas refrigerant sucked from the second refrigerant suction port 42a enters the motor unit M while sucking oil through the oil suction hole 42b on the way.

In the motor section M, first, the radial bearing 36 is passed through, and a refrigerant passage (not shown) formed between the stator 31 and the inner wall of the cylindrical casing 11 and a gap between the stator 31 and the magnet rotor 32 are passed. Enter the compression mechanism section C.

In the compression mechanism portion C, it enters the suction chamber 24 via a refrigerant passage (not shown) formed in the compressor housing 20. The gas refrigerant is also supplied to the space 26 between the fixed scroll 22 and the lower casing 13 via a refrigerant passage (not shown) formed between the fixed scroll 22 and the inner wall of the cylindrical casing 11. .

The gas refrigerant that has entered the suction chamber 24 is compressed between the scrolls 21 and 22 to become a high-pressure gas refrigerant,
It is discharged to the discharge chamber 25 formed by the fixed scroll 22 and the plate 23, and discharged from the discharge port 27 communicating with the discharge chamber 25 to the outside to the outside of the compressor (radiator 200).

Next, the features of this embodiment will be described.

The refrigerant supply path from the accumulator section A to the compression mechanism section C is entirely inside the pressure-resistant closed container 10 and is not exposed to the outside. This eliminates the heat loss due to heat exchange with the external atmosphere in the refrigerant supply path, and makes the compressor efficient.

As a part of the refrigerant supply path, an oil suction hole 42b is provided in the accumulator section A, and in the course of the path from the oil suction hole 42b to the motor section M, the temperature temporarily rises in the direction of gravity, that is, the vertical direction. Introduction pipe 42 having an inverted U-shaped supply path portion extending to the top side of the
Is provided. Further, the entire refrigerant introduction pipe 42 is formed in a laterally inverted S shape.

As a result, even when the compressor is stopped with the structure in which the accumulator section A is arranged above the compression mechanism section C, the oil from the oil suction hole 42b does not fall freely into the compression mechanism section C, and at the time of startup. In addition to preventing liquid compression and oil shortage, reliable oil supply is achieved during operation.

(Second Embodiment) FIG. 2 is a sectional view of an accumulator-integrated compressor according to a second embodiment of the present invention. The difference from the first embodiment is that the accumulator section A is formed between the compression mechanism section C and the motor section M. Portions different in structure from the first embodiment will be described together with the flow of the refrigerant.

The gas-liquid two-layer refrigerant flowing from the suction port 14 into the closed container 10 is first transferred to the motor housing 3 in the motor section M.
5, a coolant passage (not shown) formed between the stator 31 and the inner wall of the cylindrical casing 11 through a hole provided in
And, it goes into the accumulator portion A through the gap between the stator 31 and the magnet rotor 32.

In the accumulator portion A, the liquid refrigerant separated into gas and liquid and the separated oil are accumulated on the bottom of the partition plate 43 provided on the upper surface of the compressor housing 20. Further, a lip seal 44 is provided at the center of the partition plate 43, and seals with the shaft 33. Further, a tubular refrigerant separation pipe 45 is provided above the lip seal 44 at the center of the partition plate 43 so as to surround the shaft 33 and prevent the liquid refrigerant from accumulating on the lip seal 44.

Further, a refrigerant introduction pipe 42 similar to that of the first embodiment is provided on the partition plate 43, and sucks the gas refrigerant from the refrigerant suction port 42a at the upper end thereof and at the oil suction hole at the lower end of the bent portion. The oil accumulated on the partition plate 43 is sucked from 42b and supplied to the compression mechanism portion C below the partition plate 43. The gas refrigerant is sucked from the refrigerant suction port 42a at the upper end and the oil is sucked from the oil suction hole 42b at the lower end of the bent portion to be supplied to the compression mechanism portion C.

The shape of the refrigerant introduction pipe 42 is an inverted S-shape which is oriented horizontally like the first embodiment, and the oil suction hole 42b is formed.
It has an inverted U-shaped supply path portion extending toward the top side in the vertical direction. In the compression mechanism portion C, it first passes through the radial bearing 34 and enters the suction chamber 24 via a refrigerant passage (not shown) formed in the compressor housing 20. Thereafter, the path of being compressed and discharged to the outside is the same as in the first embodiment.

Next, the characteristics of this embodiment will be described. The accumulator section A is formed between the compression mechanism section C and the motor section M. As a result, a part of the space of the motor unit M can be used as the accumulator unit A, so that the entire compressor can be downsized.

(Third Embodiment) FIG. 3 is a sectional view of an accumulator-integrated compressor according to a third embodiment of the present invention. The difference from the first and second embodiments is that the compression mechanism portion C, the motor portion M, and the accumulator portion A are arranged horizontally. FIG. 3 is an example in which the configuration of the first embodiment is placed horizontally, and the suction port 14 and the collision plate 41 correspond to the horizontal placement.
Is configured above.

Further, the shape of the refrigerant introduction pipe 42 is slightly changed from that in the vertical installation in accordance with the vertical direction and the gas refrigerant supply direction. That is, the shape of the refrigerant introduction pipe 42 is a U-shape that extends toward the top in the vertical direction, and the oil suction hole 4 is provided at the bottom thereof.
2b is provided. This increases the degree of freedom in disposing the compressor using the present invention in a vehicle, an outdoor unit, or the like.

(Other Embodiments) The present invention is not limited to the above-described embodiments, but can be modified or expanded as follows.

In the above-described third embodiment, the configuration of the first embodiment is placed horizontally, but the configuration in which the accumulator section A of the second embodiment is arranged in the center may be placed horizontally. In that case, A configuration is provided in which a refrigerant introduction tube 42 for horizontal installation as shown in the third embodiment is provided, and a partition plate of a lip seal is also provided on the end surface of the motor section M on the accumulator section A side to partition the liquid refrigerant and the magnet rotor 32. Becomes

Further, although the scroll type compression mechanism is adopted as the compression mechanism C in the above-described embodiment, the accumulator-integrated compressor according to the present invention can be applied to other compression mechanisms such as a vane type and a Rotasco (rolling piston) type. May be Although the motor 30 is a DC brushless motor, it may be another electric motor such as an induction motor.

[Brief description of drawings]

FIG. 1 is a sectional view of an accumulator-integrated compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an accumulator-integrated compressor according to a second embodiment of the present invention.

FIG. 3 is a sectional view of an accumulator-integrated compressor according to a third embodiment of the present invention.

[Explanation of symbols]

10 pressure tight container 42 Refrigerant introduction pipe (refrigerant introduction means) 42a Refrigerant inlet (refrigerant inlet) 42b Oil suction hole (oil suction part) A Accumulator section C compression mechanism M motor part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyasu Kato             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Kazuhide Uchida             14 Iwatani Shimohakaku-cho, Nishio-shi, Aichi Stock Association             Company Japan Auto Parts Research Institute F-term (reference) 3H003 AA05 AB04 AB05 AC03 CD06

Claims (4)

[Claims] 1. A compression mechanism section (C) for sucking and compressing the refrigerant, inside a pressure-resistant airtight container (10) in which the refrigerant flows.
A motor section (M) that drives the compression mechanism section (C), and an accumulator section that separates the refrigerant into a liquid phase refrigerant and a vapor phase refrigerant and supplies only the vapor phase refrigerant to the compression mechanism section (C) ( A) a built-in accumulator compressor, in which the refrigerant supply path from the accumulator section (A) to the compression mechanism section (C) is entirely in the pressure-resistant closed container (1).
(1) A compressor integrated with an accumulator, which is configured inside and is not exposed to the outside. 2. An oil suction part (42b) in the accumulator part (A) as a part of the refrigerant supply path.
The accumulator-integrated type according to claim 1, further comprising: a refrigerant introduction means (42) having a supply path portion having a shape that extends from the oil suction portion (42b) to a top side in a vertical direction. Compressor. 3. The integrated accumulator according to claim 1, wherein the accumulator section (A) is formed between the compression mechanism section (C) and the motor section (M). Compressor. 4. The compression mechanism section (C), the motor section (M), and the accumulator section (A) are arranged in a horizontal position. The accumulator-integrated compressor described in.