JPH0723712B2 - Internal discharge structure of discharge fluid in hermetic compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a hermetically sealed casing with a compression element including a cylinder, and a front head and a rear head arranged at the upper and lower positions of the cylinder. The present invention relates to a discharge fluid internal discharge structure in a hermetic compressor, which discharges a compressed discharge fluid into an internal space of the casing through an upper discharge chamber provided on the front head side and a lower discharge chamber provided on the rear head side.

(Prior Art) Conventionally, a motor is internally mounted on the upper part of a closed casing, and
The internal discharge structure of the discharge fluid in a hermetic compressor in which a compression element including a cylinder and a front head and a rear head arranged at the upper and lower positions of the cylinder is installed below the motor has an internal discharge structure of the front head or the rear head. While forming a discharge hole in either one, a muffler is attached, an upper or lower discharge chamber is formed inside the muffler, an opening provided in the muffler forming the upper discharge chamber, or a rear head from the lower discharge chamber, The discharge fluid in the discharge chamber is discharged into the internal space of the casing from a bypass circuit penetrating the cylinder and the front head.

However, when the compressor is operated at high speed, it is necessary to discharge the fluid in a short time. However, if the discharge hole is provided only in either the front head or the rear head, the discharge resistance becomes large. There was a problem that the efficiency could not be reduced because the discharge adapted to high speed operation could not be performed.

Therefore, in order to cope with high-speed rotation of the compressor, discharge holes are formed in the front head and the rear head, and mufflers are attached to the upper part of the front head and the lower part of the rear head, respectively. A discharge chamber is formed inside, and an opening to the inner space of the casing is formed at an appropriate position of the muffler above the upper discharge chamber formed on the front head side, and a lower discharge formed on the rear head side. A bypass passage communicating the chamber with the upper discharge chamber is opened in the rear head, the cylinder and the front head, and the discharge fluid in the lower discharge chamber is sent into the upper discharge chamber via the bypass passage.
The discharge fluid discharged from each discharge hole is discharged into the internal space of the casing from the opening provided in the muffler forming the upper discharge chamber.

(Problems to be Solved by the Invention) However, when the high speed operation is performed, the discharge fluid velocity increases, so that the discharge fluid is mixed in the upper discharge chamber by communicating the lower discharge chamber with the upper discharge chamber through the bypass passage. At this time, the flow of the discharge fluid is severely disturbed in the upper discharge chamber, and the discharge fluid discharged from the opening is not discharged vertically upward from the opening, and the coil end or the front of the motor is not discharged. Therefore, the ink is discharged while being bent toward the bearing portion protruding from the head. Therefore, even when the opening position on the muffler is determined so that the discharge is aimed at the gap between the rotor and the stator or the gap between the stator and the casing, the discharge fluid loses the straightness, and therefore the coil of the motor is The discharge fluid discharged to the end side and colliding with the coil end bounces downward, disturbing the oil surface of the oil accumulated in the casing bottom, and discharge discharged to the bearing portion of the front head. The fluid blows up the oil flowing out from the tip of the bearing portion, and in any case,
There was a problem of causing oil to rise and lowering of the oil level.

The present invention is made in view of the above problems,
By individually discharging the discharge fluid in the upper and lower discharge chambers into the casing, and by advancing the direction of the discharge fluid discharged from the lower discharge chamber into the closed casing, the oil blow-up is reduced. ,
The main object of the present invention is to provide an internal discharge structure of discharge fluid in a hermetic compressor that can prevent oil rising and oil level drop.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides a closed casing (1) with a cylinder (3) and a front head (4) arranged above and below the cylinder (3). And a compression element (6) comprising a rear head (5) and the compression element (6)
A motor (2) consisting of a rotor (2a) and a stator (2b) is installed above the above, and the discharge fluid compressed by the compression element (6) is provided on the front head (4) side. 12a) and the lower discharge chamber (12b) provided on the rear head (5) side, respectively, to the internal discharge structure of the discharge fluid in the hermetic compressor, which discharges into the internal space of the casing (1). An opening (17a) for opening the upper discharge chamber (12a) into the internal space of the casing (1) is provided, and the opening (17a) is provided.
A) A guide body (15a) for directing the direction of the discharged fluid toward the gap between the rotor (2a) and the stator (2b).
On the other hand, a bypass passage (14a) is formed in the compression element (6), one end of which opens to the lower discharge chamber (12b) and the other end of which opens to the internal space of the casing (1). The discharge fluid is directed to the opening (17b) on the inner space side of the passage (14a) by a gap between the rotor (2a) and the stator (2b) or the stator (2b).
The guide body (15b) is provided to move straight toward the gap between the casing (1) and the casing (1).

(Operation) The discharge fluids from the upper and lower discharge chambers (12a) and (12b) can be discharged individually into the internal space of the casing (1), and the problem of discharge resistance during high-speed operation can be solved. Also, since the discharge fluid of the upper discharge chamber (12a) is not mixed with the discharge fluid of the lower discharge chamber (12b) in either chamber (12a) (12b), the discharge fluid is discharged directly into the casing (1). Disturbance of the discharge fluid from the upper and lower discharge chambers (12a) and (12b) can be reduced.

Moreover, the discharge fluid discharged from the upper discharge chamber (12a) through the opening (17a) into the casing (1), and the lower discharge chamber (12b).
Since the discharge fluid discharged from the inside of the casing (1) through the bypass circuit (14a) and the opening (17b) is guided by each of the guide bodies (15a) (15b), the discharge fluid is intended more. You can climb smoothly in the direction you want to.

Therefore, even if high-speed operation is performed, the fluid discharged from the upper and lower discharge chambers (12a) (12b) can be smoothly raised as a whole, so that the fluid discharged from the coil ends of the stator of the motor, or Since it is possible to reduce discharge toward the bearing portion side of the front bed (4), it is possible to prevent oil rising and oil level lowering.

(Example) Hereinafter, an internal discharge structure of a discharge fluid in a hermetic compressor according to the present invention will be described with reference to Examples of the drawings.

The compressor shown in FIG. 1 has a motor (2) including a rotor (2a) and a stator (2b) on an upper part of a closed casing (1).
And a compression element (6) including a cylinder (3) below the motor (2) and a front head (4) and a rear head (5) arranged above and below the cylinder (3). ) Is provided, and the front head (4) and the rear head (5) are provided with vertically extending bearing portions (4a) (5a), and the drive shaft (7) is provided at each of these bearing portions (4a) (5a). While supporting a bearing, the upper end of the drive shaft (7) is connected to the motor (2), while a roller (8) is fitted into an eccentric shaft portion (7a) of the drive shaft (7).

In addition, the cylinder (3) is provided with a blade (not shown) that is constantly in contact with the roller (8) and moves back and forth, and a suction hole (16) is provided on the front side of the blade in the rotation direction of the roller (8). ), And upper and lower discharge holes (9a) (9b) communicating with the inside of the cylinder (3) on the rear side in the rotation direction.
The discharge valve (1) is installed in the discharge hole (9a) (9b).
0) and (10) are provided.

Further, an upper muffler (11) is attached to the front head (4), and the muffler (11) constitutes one of the discharge chambers (12) to form an upper discharge chamber (12a).
And a lower muffler (13) is attached to the rear head (5) to form a lower discharge chamber (12b) constituting another one of the discharge chambers (12) by the muffler (13). There is.

Then, the rotation of the roller (8) accompanying the rotational driving of the motor (2) sucks a compressive fluid such as a gas refrigerant into the cylinder (3) from the suction hole (16), and the suction fluid is transferred to the roller. When the fluid is compressed by the rotation of (8) and the fluid is increased to a predetermined pressure, the discharge valve (10)
(10) is opened to discharge the ink from the discharge holes (9a) (9b) of the front head (4) and the rear head (5) into the upper and lower discharge chambers (12a) (12b). The discharge fluid is discharged to the inside of the casing (1) via the 12a and 12b.
Incidentally, (1a) is an intake pipe, and (1b) is an external discharge pipe.

Thus, while opening the upper discharge chamber (12a) into the internal space of the casing (1), the compression element (6) communicates the lower discharge chamber (12b) with the internal space of the casing (1). Bypass passage (14
a) and forms a guide body (1) for advancing the direction of the discharged fluid straight to the internal space side opening (17) of the bypass passage (14a).
5) is provided.

Specifically, a bypass passage (14a) is opened through the rear head (5), the cylinder (3) and the front head (4) above the lower discharge chamber (12b), and the bypass passage (14a) is formed. ), The bypass passage (14a) is provided in the opening (17) on the front head (4) side.
A cylinder formed with a step hole having a slightly larger diameter and facing the air gap (2c) between the rotor (2a) and the stator (2b) of the motor (2) in the casing (1) in the step hole. A guide body (15) made of a sheet is vertically inserted and fixed, and the upper portion of the guide body (15) is projected above the muffler (11).

The projecting fluid in the upper discharge chamber (12a) is discharged from an opening (not shown) provided at an appropriate location of the upper muffler (11).

Thus, with the above configuration, the discharge fluids from the upper and lower discharge chambers (12a) and (12b) are individually discharged into the internal space of the casing (1), in other words, the lower discharge chamber (12b). ) Is discharged directly into the casing (1) without being confused with the upper discharge chamber (12a), it is possible to reduce the turbulence of the discharge fluid in the upper discharge chamber (12a). The problem of bending of the fluid discharged from the upper discharge chamber (12a) can be reduced.

Moreover, the discharge fluid discharged from the lower discharge chamber (12b) into the casing (1) through the bypass passage (14a) and the opening (17) is guided to the guide body (15).
You will be guided to go straight.

Therefore, even if high-speed operation is performed, the discharge fluid from the upper and lower discharge chambers (12a) (12b) can be smoothly raised as a whole, so that the discharge fluid is the stator (2b) of the motor (2). ) Coil end (2f)
Alternatively, since it is possible to reduce the discharge toward the bearing portion (4a) side of the front head (4), it is possible to prevent oil rising and oil level lowering.

Further, since the guide body (15) is opposed to the air gap (2c) between the rotor (2a) and the stator (2b) of the motor (2) in the casing (1), the guide body (15). ), It is possible to discharge straightly toward the air gap (2c).
It is possible to raise the oil more smoothly through the oil, and it is possible to more effectively prevent oil rising and oil level lowering.

In the above embodiment, the guide body (15) is composed of a cylindrical body made of a separate member. However, as shown in FIG. 2, the bypass passage (14a extending from the lower discharge chamber to the front head (4) is also used. ), A protrusion (41) having an inner hole (40) communicating with the front head (4) may be formed integrally with the front head (4) by the protrusion (41). Further, as shown in FIG. 3, the muffler (11) is drawn to form a concave hole (50), and the concave hole (50) causes the guide body (15) to be integrated with the muffler (11). May be configured.

In the above embodiment, the lower discharge chamber (12
A bypass passage (14a) is opened through the rear head (5), the cylinder (3) and the front head (4) upward from b), and the bypass passage (14a) is provided on the front head (4) side. The guide body (15) is vertically fixed and fixed to the opening (17), and the upper portion of the guide body (15) is projected above the muffler (11) so as to penetrate the upper discharge chamber (12a). However, as shown in FIG. 4, the opening (17a) facing the air gap (2c) is opened in the upper muffler (11) forming the upper discharge chamber (12a), while the compression element ( 6) vertically rising from the lower discharge chamber (12b) through the rear head (5) in the wall of the cylinder (3) and horizontally extending to the casing (1) side at an appropriate position, ) The casing (1 ), A bypass passage (14b) that rises vertically upward and opens into the internal space of the casing (1) is formed, and the opening (1) of the bypass passage (14b) on the cylinder (4) side is formed.
7b) has a step hole having a diameter slightly larger than that of the bypass passage (14b), and the step hole has an inner wall surface of the casing (1) and a core cut surface (2d) of the motor (2). A guide body (15b) made of a cylindrical body may be vertically inserted and fixed so as to face the passage (2e) formed between the two.

Thus, with the above structure, the two chambers (12a) (12a) (12a)
The fluid discharged from b) is discharged from each opening (17a) (17a).
b) individually discharged from the upper discharge chamber (12
Bending of the discharge fluid due to mixing in a) can be eliminated, and the discharge fluid discharged from each of the openings (17a) and (17b) can be supplied to the air gap (2c) and the passage (2e), respectively.
And the upper discharge chamber (12) can be smoothly raised to the upper part in the casing (1).
a) through the opening (17a) to the casing (1)
The discharge fluid discharged into the casing and the discharge fluid discharged from the lower discharge chamber (12b) into the casing (1) through the bypass circuit (14a) and the opening (17b) are provided in each of the guide bodies. By (15a) and (15b), it is possible to move straight toward the air gap (2c) and the passage (2e), and the discharge fluid passes through the air gap (2c) and the air gap (2e) more smoothly. Since the oil can be raised, the effect of preventing oil rising and oil level lowering can be further improved as a whole.

(Effects of the Invention) As described above, the present invention provides the upper discharge chamber (12a) provided on the front head (4) side and the lower fluid provided on the rear head (5) side with the discharge fluid compressed by the compression element (6). In the internal discharge structure of the discharge fluid in the hermetic compressor configured to discharge into the internal space of the casing (1) through each of the discharge chambers (12b), the upper discharge chamber (12a) is connected to the casing (1). An opening (17a) that opens into the internal space is provided, and the opening (1a)
7a) A guide body (15a) for directing the direction of the discharged fluid toward the gap between the rotor (2a) and the stator (2b).
On the other hand, a bypass passage (14a) is formed in the compression element (6), one end of which opens to the lower discharge chamber (12b) and the other end of which opens to the internal space of the casing (1). The discharge fluid is directed to the opening (17b) on the inner space side of the passage (14a) by a gap between the rotor (2a) and the stator (2b) or the stator (2b).
Since the guide body (15b) that advances straight toward the gap between the casing (1) and the casing (1) is provided, the discharge fluids from the upper and lower discharge chambers (12a) (12b) are individually and individually inside the casing (1). The discharge fluid of the upper discharge chamber (12a) and the discharge fluid of the lower discharge chamber (12b) can be discharged into the space, and the discharge fluid of the lower discharge chamber (12b) can be discharged in either chamber (12a) while solving the problem of discharge resistance during high speed operation.
Since (12b) is also directly discharged into the casing (1) without being mixed, the turbulence of the discharge fluid from the upper and lower discharge chambers (12a) (12b) can be reduced.

Moreover, the discharge fluid discharged from the upper discharge chamber (12a) through the opening (17a) into the casing (1), and the lower discharge chamber (12b).
Since the discharge fluid discharged from the inside of the casing (1) through the bypass circuit (14a) and the opening (17b) is guided by each of the guide bodies (15a) (15b), the discharge fluid is intended more. You can climb smoothly in the direction you want to.

Therefore, even if high-speed operation is performed, the fluid discharged from the upper and lower discharge chambers (12a) (12b) can be smoothly raised as a whole, so that the fluid discharged from the coil ends of the stator of the motor, or Since it is possible to reduce discharge toward the bearing portion side of the front head (4), it is possible to prevent oil rising and oil level lowering.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of a compressor having an internal discharge structure according to the present invention, and FIGS. 2 and 3 are cross-sectional views of main parts for explaining another example of a guide body for a lower discharge chamber. FIG. 4 is a longitudinal sectional view of another embodiment of the compressor having the same internal discharge structure. (1) ... closed casing (3) ... cylinder (4) ... front head (5) ... rear head (6) ... compression element (12a) ... upper discharge chamber (12b) ... lower discharge chamber ( 14a) (14b) ...... Bypass passage (15) (15b) ...... Guide (17) (17b) ...... Opening

Claims (1)

[Claims] 1. A cylinder (3) in a closed casing (1).
And a compression element (6) consisting of a front head (4) and a rear head (5) arranged in the vertical position of the cylinder (3), and a rotor (2a) and a stator (2b) above the compression element (6). And a motor (2) composed of (1), and discharge fluid compressed by the compression element (6) is provided in the upper discharge chamber (12a) provided on the front head (4) side and the lower fluid provided on the rear head (5) side. Discharge chamber (12b)
The internal discharge structure of the discharge fluid in the hermetic compressor configured to discharge into the internal space of the casing (1) through each of the upper discharge chamber (12a).
Is provided with an opening (17a) that opens into the internal space of the casing (1), and the direction of the discharge fluid goes straight through the opening (17a) toward the gap between the rotor (2a) and the stator (2b). While providing a guide body (15a) for the bypass passage (14a), one end of the compression element (6) is opened to the lower discharge chamber (12b) and the other end is opened to the internal space of the casing (1). To form the bypass passage (1
The discharge fluid is directed toward the opening (17b) on the inner space side of 4a) toward the gap between the rotor (2a) and the stator (2b) or the gap between the stator (2b) and the casing (1). An internal discharge structure of discharge fluid in a hermetic compressor, characterized in that a guide body (15b) for moving straight forward is provided.