JPH07103152A - Scroll compressor - Google Patents

Abstract

PURPOSE:To promote a good liquid injection into both compression spaces as preventing any structural complication and pressure unevenness from occurring by forming an interspace, connecting to plural compression spaces, in an end plate of a fixed scroll, and connecting one liquid injection pipe to this interspace. CONSTITUTION:At least a compressor part 9 is installed upward in the inner part of a hermetically sealed vessel 1, and it is composed of both fixed and turning scrolls 23 and 25, while two compression spaces 35a and 35b are formed in space between both these scrolls. In this case, a groove 45 is formed in an end plate 27 of the fixed scroll 23, while a cover body 47 covering this groove 45 is additionally installed there. On the other hand, a liquid injection pipe 57 is connected to this cover body 47. After a liquid coolant is fed to the groove 45 from the liquid injection pipe 57, and it is also fed to both these compression spaces 35a and 35b through two interconnecting passages 47a and 47b, thereby cooling the compressor part 9. With this constitution, a liquid injection into both these compression spaces 35a and 35b is favorably performed as preventing any structural complication and pressure unevenness from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to a scroll compressor having a structure for supplying a fluid into a compression chamber or for causing a fluid to flow out of the compression chamber during a compression process.

[0002]

2. Description of the Related Art In general, a scroll compressor meshes a spiral stationary blade of a fixed scroll with a spiral moving blade of an orbiting scroll to form a gas sucked from an intake port between the stationary blade and the moving blade. Trapped in a pair of compressed chambers,
The volume of the compression chamber is gradually reduced with the orbiting motion of the orbiting scroll, and during this time the gas is compressed into high pressure gas, which is discharged from the discharge port provided near the center of the spiral of the stationary blade of the fixed scroll at the end of the compression process. It discharges in a discharge chamber.

When such a scroll compressor is incorporated in a refrigeration cycle, the liquid refrigerant discharged from the discharge port and condensed and liquefied by the condenser is supplied to the compression chamber of the scroll compressor, so-called liquid injection is performed to perform compression. What cools a part to improve the refrigerating capacity is described in JP-A-63-147982.

In this structure, two refrigerant injection holes communicating with the pair of compression chambers are formed in the end plate of the fixed scroll, and the two refrigerant injection holes supply liquid refrigerant to the pair of compression chambers. The injection pipes are connected to each other. The two injection pipes are drawn to the outside through the upper cover of the closed container in which the fixed and swivel scrolls are housed, and are connected to the refrigerant pipe through which the liquid refrigerant flowing from the condenser merges with each other. ing.

[0005]

However, in the conventional scroll compressor as described above, two liquid injection pipes are required to supply the liquid refrigerant to the pair of compression chambers, and moreover, the liquid injection pipes are required. Since it penetrates the airtight container and is drawn out of the compressor, there are four seals including the connection part to the end plates of the two injection pipes and the penetrating part between the two injection pipes and the airtight container. Is required, and the structure is complicated.

Further, since there is a distance from the branch portion between the two injection pipes to the two compression chambers, the split flow of the liquid refrigerant to the two injection pipes does not work well, and the pressures of the two compression chambers become inadequate. It is uniform and causes an increase in vibration due to unbalanced compression.

This is not limited to the liquid injection for cooling the compression section, but when the gas refrigerant is supplied to the compression chamber during the compression process to increase the amount of refrigerant circulation, or the gas in the middle of compression is taken out from the compression chamber. Even when returning to the suction side and performing release to reduce the capacity, the injection pipe or the release pipe is connected to each of the two compression chambers, and the same problem occurs.

Therefore, the present invention makes the structure complicated and
It is an object of the present invention to prevent uneven pressures in the two compression chambers, and to perform liquid injection, gas injection into the two compression chambers or release for releasing gas from the compression chambers.

[0009]

In order to achieve the above object, the present invention is, firstly, to provide a fixed scroll having an end plate and a spiral stationary vane erected on the end plate, and an end plate. And a swirl scroll that is provided upright on the end plate and that swivels with respect to the fixed scroll with the stationary blades and the swivel blades meshing with each other. In a scroll compressor in which a pair of compression chambers are sequentially formed from the outer circumference to the center with a decrease in volume, a portion of the end plate of the fixed scroll opposite to the stationary blades is provided with a portion facing both the pair of compression chambers. A space provided is formed, and a communication passage that connects the space and the pair of compression chambers is provided in the end plate, and a liquid injection pipe that supplies a liquid refrigerant to the pair of compression chambers is connected to the space. Constitution Are you.

Secondly, a fixed scroll having an end plate and a spiral stationary vane standing upright on the end plate, and an end plate and a spiral moving blade standing upright on the end plate are provided. A stationary scroll is provided with an orbiting scroll that orbits with the stationary blades and the moving blades meshing with each other, and a pair of compression chambers are formed corresponding to the orbiting motion of the orbiting scroll, with the volume gradually decreasing from the outer circumference to the center. Scroll compressor,
A space having a portion facing both the pair of compression chambers is formed on a surface of the end plate of the fixed scroll opposite to the stationary blades, and a communication passage communicating between the space and the pair of compression chambers is formed. A gas injection pipe for supplying a gas refrigerant to the pair of compression chambers is connected to the space while being provided on the end plate.

Thirdly, a fixed scroll having an end plate and a spiral stationary vane standing on the end plate, and an end plate and a spiral moving blade standing on the end plate are provided. A stationary scroll is provided with an orbiting scroll that orbits with the stationary blades and the moving blades meshing with each other, and a pair of compression chambers are formed corresponding to the orbiting motion of the orbiting scroll, with the volume gradually decreasing from the outer circumference to the center. Scroll compressor,
A space having a portion facing both the pair of compression chambers is formed on a surface of the end plate of the fixed scroll opposite to the stationary blades, and a communication passage communicating between the space and the pair of compression chambers is formed. The release pipe is provided on the end plate, and a release pipe for allowing gas to flow out from the pair of compression chambers is connected to the space.

[0012]

According to the scroll compressor having such a construction, one liquid injection pipe is provided in the two compression chambers through the space formed on the surface of the end plate on the side opposite to the stationary blades and communicating with the two compression chambers. ， Because one gas injection pipe or one release pipe is connected and connected, liquid injection into two compression chambers is prevented while preventing the complication of the structure and the non-uniformity of pressure between the two compression chambers. Can perform gas injection or release to release gas from the compression chamber.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a scroll compressor showing an embodiment of the present invention. The airtight container 1 is connected with a suction pipe 3 on a side portion and a discharge pipe 5 on an upper portion, a drive unit 7 is provided on a lower portion of the airtight container 1, and a compressor portion 9 is provided on an upper portion thereof. .

The drive unit 7 is a rotor 1 fixed to a main shaft 11.
3 and a stator 15 fixed to the inner surface of the hermetic container 1, and when a current flows through the stator 15, rotational power is applied to the main shaft 11 via the rotor 13. The main shaft 11 is rotatably supported at both ends by upper and lower bearing members 17 and 19 fixed to the closed container 1, and
The upper end is a crankshaft portion 21 which is eccentric from the axis of the main shaft 11 by a predetermined amount.

On the other hand, the compressor section 9 is composed of a fixed scroll 23 made of an iron material and an orbiting scroll 25 made of an aluminum material. The fixed scroll 23 has a shape in which a spiral stationary vane 29 rises from a flat plate-shaped end plate 27, and the outer circumference of the end plate 27 is the closed container 1.
Is fixed to the frame portion 30 on the outer peripheral side of the bearing member 17, which is fixedly supported on the inner wall surface of the.

The orbiting scroll 25 has a flat end plate 31.
The spiral moving blade 33 rises from the above, and the moving blade 33 meshes symmetrically with the stationary blade 29 of the fixed scroll 23, and these mesh with each other between the stationary blade 29 and the moving blade 33. As shown in FIG. 2, which is a plan view showing the compression process in the opened state, a pair of compression chambers 35a and 35b are formed, respectively. The compression chambers 35a and 35b are the fixed scroll 2
The discharge hole 37 provided through almost the central portion of the end plate 27 of No. 3 communicates in the discharge state of FIG. Also,
The crank bearing 39 formed on the lower surface of the end plate 31 of the orbiting scroll 25 is rotatably fitted in the crank shaft portion 21 of the main shaft 11.

The end plate 31 of the orbiting scroll 25 is supported by a thrust bearing 41, and an Oldham mechanism 43 is also provided.
The orbiting scroll 25 is given a orbiting motion via the.
As a result, the compression chambers 35a and 35b are shown in the binding completion state of FIG. 2 (a), the compression state of FIG. 2 (b), the compression completion state of FIG. 2 (c), and the discharge state of FIG. 2 (d). As described above, the volume gradually decreases toward the center corresponding to the orbiting movement of the orbiting scroll 25.

A V-shaped groove 45 is formed on the upper surface of the end plate 27 of the fixed scroll 23, as shown in FIG. 3 which is a plan view of FIG. 1 at this portion. This groove 45
Is located at a position facing the compression chambers 35a and 35b in FIG. 2 (b) showing the compressed state in the vicinity of the two compression regions 35a and 45b. Is the communication passage 4 formed in the end plate 27.
7a and 47b communicate with each other.

On the upper surface of the end plate 27 of the fixed scroll 23, a circular lid 49 that covers the entire V-shaped groove 45 is formed.
Are fixed by three bolts 51. This lid 4
The inside of the groove 49 closed by 9 is the fixed scroll 2
3 is a space formed on the surface of the end plate 27 of No. 3 opposite to the stationary blade 29. Since the lid 49 has a shape that also covers the ejection hole 37 of the end plate 27, an opening hole 53 is formed at a position aligned with the ejection hole 37. As a result, the compression chambers 35a and 35b have the discharge holes 37 in FIG.
And the discharge chamber 54 is opened through the opening hole 53.

A connection port 55 is opened in the lid 49 at a substantially central portion of the groove 45, that is, at a position corresponding to a V-shaped bent portion.
Liquid injection pipe 57 for supplying to a and 35b
One end of is connected. The other end of the liquid injection pipe 57 penetrates the upper surface of the closed container 1 and is drawn to the outside.

FIG. 4 shows a case where the scroll compressor 59 as described above is incorporated in a refrigeration cycle comprising a condenser 61, a first throttle mechanism 63, a gas-liquid separator 65, a second throttle mechanism 67 and an evaporator 69. 2 shows a refrigeration cycle configuration of FIG. The high-temperature and high-pressure gas refrigerant discharged from the scroll compressor 59 is condensed in the condenser 61 and is decompressed by the first throttle mechanism 63 to reach the gas-liquid separator 65, where it becomes the liquid refrigerant L and the gas refrigerant G. To be separated. The liquid refrigerant L is further depressurized by the second throttling mechanism 67 and then reaches the evaporator 69,
Here, it vaporizes and becomes a gas refrigerant and returns to the compressor 59.

The other end of the above-mentioned liquid injection pipe 57 is connected to the lower portion of the gas-liquid separator 65 where the liquid refrigerant L exists, and the liquid refrigerant L in the gas-liquid separator 65 is connected.
Is supplied to the compressor section 9 of the scroll compressor 59 through the liquid injection pipe 57. Gas-liquid separator 6
5, the liquid refrigerant L flowing out from the liquid injection pipe 57
Enters the groove 45 of the end plate 27 of the fixed scroll 23 in the scroll compressor 59, and the communication passage 47a,
Two compression chambers 35 during the compression of FIG.
a and 35b, and the compressor part 9 is cooled.

According to such a scroll compressor, the groove 45 is formed in the end plate 27 of the fixed scroll 23 as a structure for supplying the liquid refrigerant from the gas-liquid separator 65 to the compression chambers 35a, 35b of the scroll compressor 59. However, one liquid injection pipe 57 is connected to the groove 45. Therefore, the liquid injection pipe 57
The connection configuration of the liquid injection pipe 57 to the compressor main body is simplified, and the sealing portion for the connection portion of the liquid injection pipe 57 to the compressor main body side is also connected to the lid 49 of the liquid injection pipe 57 and the closed container 1. It is only necessary to provide the two penetrating portions, and the structure is simplified and the manufacturing is easy.

Further, since the liquid refrigerant is supplied to the two compression chambers 35a and 35b by the single liquid injection pipe 57, the amount of the refrigerant supplied to the two compression chambers 35a and 35b becomes uniform and the two compression chambers 35a and 35b are compressed. The pressures in the chambers 35a and 35b are also kept uniform, and an increase in vibration due to unbalanced compression is prevented.

In FIG. 5, instead of the circular lid 49 shown in FIG. 3, on the end plate 27 of the fixed scroll 23, a V-shaped lid 71 matching the V-shape of the groove 45 is fixed with bolts 51. It was done. The lid 71 also has a connection port 73 through which the liquid injection pipe 57 is connected.

FIG. 6 shows the liquid injection pipe 5 described above.
7 as a gas injection pipe 75, and a gas-liquid separator 6
The gas refrigerant G in 5 is supplied to the compression chambers 35a and 35b to make the capacity of the compressor variable. That is, one end of the gas injection pipe 75 is connected to the groove 45 of the fixed scroll 23 of the scroll compressor 59, and the other end is connected to the upper part of the gas-liquid separator 65 in which the gas refrigerant G is stored.

In FIG. 7, the pipe communicating with the groove 45 of the fixed scroll 23 of the scroll compressor 59 is replaced with the liquid injection pipe 57 or the gas injection pipe 75, and the gas under compression in the compression chambers 35a, 35b is replaced by the scroll compressor 59. The release pipe 77 is for returning to the suction side to reduce the capacity. That is, one end of the release pipe 77 is connected to the groove 4 of the fixed scroll 23.
5, and the other end is connected to a pipe 79 on the suction side of the scroll compressor 59.

Even when the gas injection pipe 75 or the release pipe 77 is used, the same effect as that of the liquid injection pipe 57 is obtained.

In the above embodiment, the fixed scroll 2
Although the groove 45 is formed on the side of the end plate 27 of 3, the groove for connecting the two compression chambers 35a and 35b may be formed on the side of the lid 49 or 71, and the groove 45 is not limited to the V shape. Instead, it may be arcuate.

[0031]

As described above, according to the present invention, a space communicating with two compression chambers is formed on the surface of the end plate of the fixed scroll on the side opposite to the stationary blades.
Since one liquid injection pipe, one gas injection pipe or one release pipe is connected in communication,
It is possible to perform liquid injection into two compression chambers, gas injection to the two compression chambers, or release of gas from the compression chambers, while preventing the structure from becoming complicated and the pressure in the two compression chambers from becoming uneven.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is an operation explanatory view showing a compression process in the scroll compressor of FIG.

FIG. 3 is a plan view of a fixed scroll equipped with a lid in the scroll compressor of FIG.

FIG. 4 is a refrigeration cycle configuration diagram in which the scroll compressor of FIG. 1 is incorporated.

5 is a plan view showing a modified example of a lid body mounted on the surface of the fixed scroll in the scroll compressor of FIG. 1. FIG.

6 is a refrigeration cycle configuration diagram when a gas injection pipe is connected to the scroll compressor in FIG. 1. FIG.

7 is a refrigeration cycle configuration diagram in which a release pipe is connected to the scroll compressor of FIG.

[Explanation of symbols]

 23 fixed scroll 25 orbiting scroll 27 end plate 29 stationary blade 33 moving blade 35a, 35b compression chamber 43 end plate 45 groove (space) 47a, 47b communication passage 57 liquid injection pipe 75 gas injection pipe 77 release pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masao Ozu Inventor Masao Ozu 8th Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Incorporated, Toshiba Living Space Systems Engineering Laboratory Co., Ltd. No. 9 within Toshiba Abu E, Inc.

Claims (3)

[Claims] 1. A fixed scroll provided with an end plate and a spiral stationary blade standing on the end plate, and the fixed scroll provided with an end plate and a spiral moving blade standing on the end plate. On the other hand, a scroll having a orbiting scroll that orbits in a state where the stationary blades and the moving blades are meshed with each other, and a pair of compression chambers in which the volume gradually decreases from the outer periphery to the center in response to the orbiting motion of the orbiting scroll. In the compressor, a space having a portion facing both of the pair of compression chambers is formed on a surface of the end plate of the fixed scroll opposite to the stationary vanes, and the space for communicating the space with the pair of compression chambers is formed. A scroll compressor, wherein a passage is provided in the end plate, and a liquid injection pipe for supplying a liquid refrigerant to the pair of compression chambers is connected in communication with the space. 2. A fixed scroll having an end plate and a spiral stationary vane standing upright on the end plate, and the fixed scroll having an end plate and a spiral moving vane standing upright on the end plate. On the other hand, a scroll having a orbiting scroll that orbits in a state where the stationary blades and the moving blades are meshed with each other, and a pair of compression chambers in which the volume gradually decreases from the outer periphery to the center in response to the orbiting motion of the orbiting scroll. In the compressor, a space having a portion facing both of the pair of compression chambers is formed on a surface of the end plate of the fixed scroll opposite to the stationary vanes, and the space for communicating the space with the pair of compression chambers is formed. A scroll compressor, wherein a passage is provided in the end plate, and a gas injection pipe for supplying a gas refrigerant to the pair of compression chambers is connected in communication with the space. 3. A fixed scroll having an end plate and a spiral stationary vane standing on the end plate, and the fixed scroll having an end plate and a spiral moving blade standing on the end plate. On the other hand, a scroll having a orbiting scroll that orbits in a state where the stationary blades and the moving blades are meshed with each other, and a pair of compression chambers in which the volume gradually decreases from the outer periphery to the center in response to the orbiting motion of the orbiting scroll. In the compressor, a space having a portion facing both of the pair of compression chambers is formed on a surface of the end plate of the fixed scroll opposite to the stationary vanes, and the space for communicating the space with the pair of compression chambers is formed. A scroll compressor, wherein a passage is provided in the end plate, and a release pipe for allowing gas to flow out from the pair of compression chambers is connected in communication with the space.