JPH0412183A - Scroll compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a low-temperature scroll compressor used in container refrigerators and the like.

(Prior Art) Conventionally, this type of scroll compressor has been disclosed in Japanese Patent Publication No. 1-5, for example.
As described in Japanese Patent No. 1745 and shown in FIG. 4, there is a fixed scroll (A) in which a wrap (b) is erected on an end plate (a), and a wrap (C) is erected on an end plate. A movable scroll (B) consisting of
) (B) are arranged opposite each other, and each of the above-mentioned wraps (b) (c
), two systems of compression chambers (X) and (Y) are formed between the opposing parts of By forming two injection ports (e) and (f) and injecting the liquid refrigerant flowing through the refrigerant pipes from these ports (e) and (f) into each of the compression chambers (X) and (Y), The gas compressed in each of the compression chambers (X) and (Y) is cooled.

(Problem to be Solved by the Invention) However, in the scroll compressor described above, two injection ports (e ) (f), two passage systems are required to connect these ports (e) and (f) to the injection piping. In other words, each port (e) is ) (f), and if this injection passage is communicated with the injection piping, the passage structure can be easily configured. In the case where the ports (e) and (f) are formed at symmetrical positions with respect to d), when forming the injection passage, the injection passage passes through the discharge hole (d). Therefore, it is necessary to provide separate injector passages for connecting each port (e) and (f) to the injection piping, and two injector four passages are required. , which has the problem of complicating the passage structure and increasing the number of parts.

The present invention was made in view of the above-mentioned problems, and its purpose is to simplify the passage configuration while minimizing performance deterioration.
An object of the present invention is to provide a scroll capable of cooling discharged gas.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a mirror plate (21).
In a scroll compressor comprising a fixed scroll (2) with wraps (22) (32) erected on (31,) and a movable scroll (3), a compression stroke in an end plate (21) of the fixed scroll (2) Two compression chambers (XI) formed by each of the scrolls (2) and (3) in the rear half
(Yl) is provided with a plurality of liquid injection ports (5) (El) for injecting liquid refrigerant, and a line connecting these liquid injection ports (5) (E3) is connected to a discharge port provided in the fixed scroll (2). (
23) is characterized by being displaced to one side.

(Function) Since each liquid injection port (5) (E3) is formed in a straight line at a position displaced to one side with respect to the discharge port (23) of the fixed scroll (2),
When connecting the ports (5) and (6) to the injection piping, the end plate (
21), 1 which connects each of the ports (5) and (6) in a straight line.
It is only necessary to form two injector 1 passages and connect each of the above-mentioned bows (5) and (6) to the injection piping via these injector passages. Therefore, the passage configuration is simple, and the performance of the compressed gas is reduced with less deterioration. Cooling takes place.

In addition, each of the compression chambers (X1) (Y1) on the latter half side of the compression stroke
In addition, since the liquid refrigerant is injected from each of the ports (5) and (6), the discharged gas can be cooled with little performance degradation.
Liquid injection into Y1) can be performed when the furnace is open, and almost no pressure imbalance occurs.

(Example) The scroll compressor shown in Fig. 3 has a hermetic casing (
1), there is a fixed scroll (2) consisting of an end plate (21) with a wrap (22) standing upright, and an end plate (31).
) with a wrap (32) erected on the movable scroll (3
) are arranged vertically facing each other, and each scroll (2
) (3) is provided with a motor (4) having a drive shaft (41) interlockingly connected to the movable scroll (3), and the drive shaft (41) accompanying the drive of the motor (4). ) rotates the movable scroll (3) to the fixed scroll (
2), the refrigerant gas introduced from the refrigerant suction pipe (11) is passed through two systems of high and low pressure side compression chambers (Xi, X2) (
Yl, Y2) to compress the high pressure side compression chamber (Xi, Y2).
The liquid is discharged from a discharge port (23) provided at the center of the fixed scroll (2) through a discharge pipe (12) to the outside of the casing (1).

Therefore, in the embodiment shown in FIG. 1, the end plate (2) of the fixed scroll (2) is used in the above scroll compressor.
In the second half of the compression stroke in 1), the high pressure side compression chamber (
Xi) Two first and second liquid injection ports (5) (6) for injecting liquid refrigerant into ('Yl)
A line connecting these ports (5) and (6) is displaced to one side with respect to the discharge boat (23), and one line is provided inward from the outer peripheral wall of the end plate (21) toward the center. It communicates with the injection passage (7).

The first liquid injector port (5) discharges the liquid after the movable scroll (3) has made a half rotation from the start of injection at a position in contact with the outside of the fixed scroll (2) near the winding start tip of the wrap (22). Port (23)
The second liquid injector port (6) is provided at a position communicating with the first liquid injector port (5), and the involute curve is ';270.
``Provided at a displaced position and in the center between the wraps (22), each of these liquid injector collars:''
l-to (5) and (6), as described later, each of the compression chambers (
X1) (Y1) is designed so that injection can be started when the furnace is opened.

An injection pipe (6) extending from a refrigerant pipe on the condenser outlet side is connected to the injection passage (7), and the liquid refrigerant is injected into the injection pipe through this pipe (6) and the injection passage (7). Each port (5)
(6) is injected into each compression chamber (X1) (Y1) on the high pressure side.

Therefore, each of the injection ports (5) (6)
The straight line connecting these ports (5) and (6) will be displaced to one side with respect to the discharge port (23), and each of these ports (5) and (6) will be displaced to the center side. The high-pressure side compression chambers (Xl) (Yl) are formed in such a manner that they are opened to the high-pressure side compression chambers (Xl) (Yl). To explain in more detail, at the tip end of the wrap (22) in the fixed scroll (2),
The first injection port (5) is provided at an outer peripheral position on the opposite side of the discharge port (23) in the wrap (22), and is displaced with respect to the discharge port (23), and the first injection port (5) For port (5),
27 along the involute curve of the wrap (22)
At the position rotated by 0 degrees, the winding start tip of the wrap (22) and the next wrap (22) that is continuously wound thereon.
The second injection extension port (6
) will be established. and one injection passage provided in a straight line from the outer peripheral wall of the end plate (21) of the fixed scroll (2) to the inner center side (toward the inner center side) so as to connect the above-mentioned ports (5) and (6) in a straight line. (7).As mentioned above, each port (5)
(6) is one injection passage provided in a straight line (
By connecting the injector B passage (7) to the injector piping (6), the liquid refrigerant introduced from the piping (6) can be communicated with each port (5) (
6) into the respective compression chambers (X1) (Y1), the discharged gas can be cooled with a simple passage configuration of one system.

Next, the operation of the scroll compressor configured as above is explained.
This will be explained based on FIG. First, when the movable scroll (3) is rotated by a predetermined angle with respect to the fixed scroll (2) and is in the state shown in FIG.
At the wrap (32) of 3), the injection ports (5) and (6) are opened, and injection is started into the high pressure side compression chambers (X1) (Y1) on the latter half side of each compression stroke, Within the rotation range from the state (A) where this injection starts to the state (C) where it is rotated 180 degrees through the intermediate state (B),
Each compression chamber (Xl) (Yl
) Since the liquid refrigerant is simultaneously injected into the compression chambers (Xl) (Yl), there is no pressure imbalance in each compression chamber (X1) (Y1), and the compressed gas is cooled by the liquid refrigerant in each compression chamber (X1) (Y1). Ru. Moreover, the movable scroll (
3) is rotated 180 degrees from state (c) in the same figure, through intermediate states (d) and (e), and then rotated 380 degrees (to)
In the rotation range up to the state, each port)
(5) (6) is among the compression chambers (X1) (Y1),
The movable scroll ( 3) exceeds 180 degrees,
When in the state (d) above, each compression chamber (Xl) (
Immediately thereafter, Yl) opens to the discharge boat (23), and due to the opening to the discharge boat (23), the discharge gas from this discharge boat (23) flows backward, and flows into each of the compression chambers. The internal pressure of (XI) (Yl) rises instantaneously and becomes higher than the injection pressure from each of the boats (5) and (6), so that virtually no injection is performed. Therefore, the movable scroll (
Even if 3) is in a rotation range exceeding 180 degrees, the pressure imbalance in each of the compression chambers (X1) (Y1) becomes negligible.

Furthermore, each of the injection ports (5) and (6),
Of the two systems of high and low pressure side compression chambers (Xi, X2) (Yl, ¥2) formed between the wraps (22) and (32),
When opening the low pressure side compression chambers (X2) (¥2) formed on the outside of each of the scrolls (2) and (3), during the suction stroke of each of these compression chambers (X2) (¥2) or Liquid refrigerant is injected during the first half of the compression stroke, resulting in a decrease in volumetric efficiency and an increase in input power.
) are opened to the high-pressure side compression chambers (X1) (Y1) in the latter half of the compression stroke, and liquid refrigerant is injected into the closed space, resulting in a decrease in volumetric efficiency.
The input does not increase, and the discharged gas can be cooled with less performance deterioration. In the above embodiment, two injection ports (5) and (6) are formed in the end plate (21) of the fixed scroll (2) to be opened to each of the compression chambers (X1) (Y1) in the latter half of the compression stroke. However, it is also possible to form a plurality of these boats (5) (E3).

(Effects of the Invention) As explained above, the scroll pressure machine of the present invention is formed by the fixed and movable scrolls (2) and (3) in the latter half of the compression stroke of the end plate (21) of the fixed scroll (2). A plurality of injection ports (5) (6) inject liquid refrigerant into two compression chambers (Xl) (Yl).
), and the line connecting these boats (5) and (6) was displaced to one side with respect to the discharge port (23) formed in the fixed scroll (2), so one injection passage can handle two injection passages. Since injection can be carried out into two compression chambers (Xl) (Yl) and two injection passages as required in the past can be eliminated, a simple passage configuration can be achieved without complicating the passage configuration. The number of parts can be reduced because the connection with the injection piping is simplified, and since the injection is performed in the latter half of the compression stroke, there is little performance deterioration, and the discharged gas can be cooled in the same way as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a fixed scroll showing an embodiment of a scroll compressor according to the present invention, FIGS. FIG. 4 is a partially cutaway sectional view showing the overall structure of the compressor, and is a drawing showing a conventional example. (2) --- Fixed scroll (3) --- Fist --- Movable scroll (21, 31) --- 1111 end plate (22, 32) --- Wrap (23) --- @ Battle -- Discharge boat (5, 6 )φ...Liquid injection port (Xi, Y
l)...Compression chamber

Claims (1)

[Claims] 1) Fixed scroll (2) and movable scroll (3) with wraps (22) (32) erected on end plates (21) (31)
A scroll compressor comprising: a second half of the compression stroke in the end plate (21) of the fixed scroll (2);
A plurality of liquid injection ports (5) (6) are provided for injecting liquid refrigerant into the two compression chambers (X1) (Y1) formed by the respective scrolls (2) (3), and these liquid injection ports (5) are provided. )(6
) is displaced to one side with respect to the discharge port (23) provided in the fixed scroll (2).