JPH09144658A - Coolant compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress discharge pulsation while ensuring the passage sectional area of coolant necessary for a connecting discharge pipe. SOLUTION: This compressor has a plurality of connecting discharge pipes 20, 21 for guiding the coolant discharged from the cylinder of a compression element 5 housed in a sealed vessel to a discharge pipe 3. The connecting discharge pipes 20, 21 are branched, thereby minimizing the inner diameter for each pipe while ensuring a necessary passage sectional area. Therefore, the flow velocity of the coolant passing there can be enhanced to reduce the discharge pulsation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant compressor used in a refrigerator or the like, and improves a refrigerant discharge passage extending from a cylinder to a discharge pipe of a closed container.

[0002]

2. Description of the Related Art A conventional refrigerant compressor will be described with reference to FIG. In FIG. 4, reference numeral 1 denotes a closed container, which is provided with a suction pipe 2 and a discharge pipe 3 which are connected to an external refrigeration circuit and which penetrate through the lower portion. A compression element 5 and an electric element 6, which are fixed above and below a support frame 4, are elastically supported and housed in a closed container 1 via a support device 7. The supporting device 7 is configured by fitting a guide pin provided on the inner wall of the closed container 1 facing upward and a guide pin facing downward facing the support frame 4 facing downward, with a coil spring.

The electric element 6 has a stator 8 having a winding wound therein, a rotor 9 disposed inside the stator 8, and a rotor 9 mounted in the center of the rotor 9 to support the support frame 4. It comprises a rotating shaft (not shown) rotatably supported by bearings in a direction perpendicular to the plane of the drawing.

The compression element 5 includes a cylinder 10 and a piston 12 that reciprocates in the cylinder 10 due to eccentric rotation of a crankpin 11 provided on the top of a rotary shaft, and a valve seat plate 13 provided on an end surface of the cylinder 10. And this valve seat plate 13
And a cylinder head 14 attached to the cylinder 10 via A suction hole and a discharge hole are formed in the valve seat plate 13, and a suction reed valve and a discharge reed valve for opening and closing the respective openings are provided. The suction reed valve and the discharge reed valve open and close the suction hole and the discharge hole of the valve seat plate 13 in accordance with the reciprocating movement of the piston 12 in the cylinder 10.

Reference numeral 15 is an intake muffler, into which the refrigerant from the intake pipe 2 is introduced and connected to the end of the cylinder 10 via a passage pipe 16. The end opening of the passage pipe 16 has a valve seat plate 13
It is located so as to face the suction hole formed in. 1
Reference numeral 7 is a discharge muffler provided in the cylinder head 14, into which the refrigerant discharged from the cylinder 10 is introduced. 1
Reference numeral 8 denotes a discharge pipe for connection, which is connected between the discharge muffler 17 and the discharge pipe 3 to discharge the refrigerant from the discharge muffler 17 to the discharge pipe 3
Lead to.

Refrigerant returned from the external refrigeration circuit enters the inside of the cylinder 10 from the suction pipe 2 through the suction muffler 15, the passage pipe 16, and the suction hole of the valve seat plate 13 as the piston 12 moves away from the end of the cylinder 10. Inhaled into. Then, as the piston 12 approaches the end of the cylinder 10, the refrigerant is compressed in the cylinder 10 and discharged from the discharge hole of the valve seat plate 13, and the discharge pipe 3 via the discharge muffler 17 and the connection discharge pipe 18. Is exhaled from.

[0007]

In the conventional refrigerant compressor as described above, the inner diameter of the connecting discharge pipe 18 is designed according to the output of the compressor (the size of the excluded volume). Generally, the inner diameter of the connecting discharge pipe is increased as the output of the refrigerant compressor is increased so as not to become the passage resistance of the discharged refrigerant. When the inner diameter of the connecting discharge pipe is increased, the flow velocity of the refrigerant flowing in the pipe becomes slow, so that the pulsation becomes large and the vibration of the refrigerant compressor becomes large.

It is an object of the present invention to provide a refrigerant compressor in which the discharge pulsation is suppressed while ensuring the passage sectional area of the refrigerant required for the connecting discharge pipe.

[0009]

SUMMARY OF THE INVENTION According to the present invention, an electric element provided in a closed container and a cylinder driven by an electric element provided in the closed container sucks a refrigerant into a cylinder, compresses the refrigerant, and discharges the refrigerant to the outside of the cylinder. In the refrigerant compressor provided with a compression element and a discharge pipe provided in the closed container for discharging the refrigerant to the outside of the closed container, a plurality of connecting discharge pipes for guiding the refrigerant discharged from the cylinder to the discharge pipe are provided. Characterize. By providing a plurality of connecting discharge pipes and branching the pipes, the inner diameter of each pipe can be reduced while ensuring the required passage cross-sectional area, and therefore the flow velocity of the refrigerant passing therethrough can be increased. Further, since the surface area of the connecting discharge pipe is large, the amount of heat radiation is large, the temperature of the discharged refrigerant is lowered, and the volume efficiency is improved.

Further, by virtue of the plurality of connecting discharge pipes extending from the cylinder in mutually opposite directions and connected to the discharging pipes, vibrations due to discharge pulsations in the respective connecting discharge pipes can be canceled out.

Further, a plurality of connecting discharge pipes are arranged in the axial direction of the rotating shaft of the electric element. Since the refrigerant compressor oscillates by receiving a rotational reaction force in the direction opposite to the rotation direction of the rotating shaft at the time of starting / stopping, by arranging a plurality of connecting discharge pipes in the axial direction of the rotating shaft, rigidity in the vibration direction is improved. Avoid vibrations at start / stop by not increasing the height. By arranging the plurality of connecting discharge pipes in this way, the rigidity in the arranged direction becomes high, and therefore, the rigidity becomes strong against external force during transportation.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
It will be described based on the schematic configuration diagram of FIG. The refrigerant compressor is configured by housing an electric element 6 and a compression element 5 in a closed container 1.
The closed container 1 is provided with a suction pipe 2 for sucking the refrigerant from the external refrigeration circuit and a discharge pipe 3 for discharging the refrigerant compressed by the compression element 5 driven by the electric element 6 to the external refrigeration circuit. . The compression element 5 has only one cylinder in which the refrigerant is sucked into the space and the sucked refrigerant is compressed due to the reduction of the volume of the space. The refrigerant from the external refrigeration circuit is sucked into the cylinder from the suction pipe 2 through the suction passage 19. The refrigerant compressed in the cylinder is
It is discharged from the discharge pipe 3 through the discharge passage 22 including the connection discharge pipes 20 and 21. The discharge pipes 20 and 21 for connection are 1
A plurality of cylinders are connected to each other, and the refrigerant from the cylinders is branched and merged in the discharge pipe 3.

Since the connecting discharge pipes 20 and 21 are divided into a plurality of pipes, the inner diameter of the pipe required to secure the same cross-sectional area of the discharge passage as when connecting with one pipe becomes small. As a result, the flow velocity of the discharged refrigerant passing through the discharge passage pipes 20 and 21 becomes high, and the pulsation becomes small. Therefore, the vibration due to the discharge pulsation is suppressed.

Further, since the total surface area of the plurality of connecting discharge pipes 20 and 21 is larger than that of the conventional one,
The amount of heat radiation increases, and the temperature of the discharged refrigerant passing through is lowered.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view showing the refrigerant compressor of the first embodiment. The same parts as those of the refrigerant compressor of FIG. 4 described in the prior art are designated by the same reference numerals and the description thereof will be omitted. . In this embodiment, two outlets for the refrigerant from the discharge muffler 17 are provided, and connecting discharge pipes 23, 24 for connecting the respective outlets and the discharge pipe 3 are provided. Discharge pipe 23 for connection,
Numerals 25 extend from the discharge muffler 17 in mutually opposite directions, and are gathered at the end portions of the discharge pipe 3 protruding along the inner wall of the closed container 1 into the closed container 1. The refrigerant discharged from the discharge muffler 17 branches into two connecting discharge pipes 23 and 24, merges in the discharge pipe 3, and is discharged to the outside.

Since the connecting discharge pipes 23 and 24 are divided into two, the inner diameter of the pipe required to secure the same cross sectional area of the discharge passage as in the case of connecting with one pipe becomes small. This allows
The flow velocity of the discharged refrigerant passing through the discharge passage pipes 23, 24 becomes high, and the pulsation becomes small. Therefore, the vibration due to the discharge pulsation is suppressed. Further, the amount of heat radiation increases due to the increase in the total surface area of the two connecting discharge pipes 23 and 24, and the temperature of the discharge refrigerant passing therethrough is lowered.

Furthermore, since the connecting discharge pipes 23 and 24 extend in opposite directions from the discharge muffler, vibrations due to discharge pulsations occur in mutually opposite directions, so that even if vibrations occur, they cancel each other out. It is possible to reduce the occurrence of vibration.

FIG. 3 is a schematic sectional view showing another embodiment. The same parts as those of the refrigerant compressor shown in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the connecting discharge pipes 25 and 26 branched from the outlet of the discharge muffler 17 are arranged in the axial direction of the rotary shaft 27 of the electric element 6. this is,
This is to prevent the rigidity in this direction from increasing because a reaction force is generated in the direction opposite to the rotation direction of the rotary shaft 27 at the time of starting and stopping. Further, the absorbing action for the reaction force generated in this direction is not reduced. Moreover, the rotating shaft 27
Since the rigidity in the axial direction (the arrangement direction of the connecting discharge pipes 25 and 26) becomes high, the rigidity becomes strong against external force during transportation.

[0020]

As described above, according to the present invention, the passage through which the refrigerant discharged from the cylinder of the compression element is guided to the discharge pipe provided in the closed container is formed by a plurality of connecting discharge pipes. With this configuration, the inner diameter of each connecting discharge pipe can be reduced, and the total surface area of the connecting discharge pipe can be increased. Therefore, the flow velocity of the refrigerant flowing in the pipe is increased, discharge pulsation can be suppressed,
The resulting vibration is reduced. Further, the amount of heat radiation can be increased to lower the temperature of the discharged refrigerant, and the volumetric efficiency can be improved.

Further, by providing a plurality of connecting discharge pipes extending in opposite directions from the cylinder, it is possible to cancel the vibrations caused by the discharge pulsation and reduce the vibrations.

Furthermore, by arranging the plurality of connecting discharge pipes in the axial direction of the rotary shaft, the rigidity against the external force during transportation is improved without reducing the absorbing action of the vibration generated when the compressor starts and stops. You can

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a refrigerant compressor of the present invention.

FIG. 2 is a plan view of the refrigerant compressor of the present invention.

FIG. 3 is a cross-sectional view of the refrigerant compressor of the present invention.

FIG. 4 is a plan view of a conventional refrigerant compressor.

[Explanation of symbols]

 1 Closed Container 3 Discharge Pipe 5 Compression Element 6 Electric Element 10 Cylinder 20 Discharge Pipe for Connection 21 Discharge Pipe for Connection 23 Discharge Pipe for Connection 24 Discharge Pipe for Connection 25 Discharge Pipe for Connection 26 Discharge Pipe for Connection 27 Rotation Shaft

Claims (3)

[Claims] 1. An electric element provided in an airtight container, a compression element provided in the airtight container, driven by the electric element to suck a refrigerant into a cylinder, compress the refrigerant, and discharge the refrigerant outside the cylinder. A refrigerant compressor provided with a discharge pipe for discharging the refrigerant to the outside of the closed container, wherein a plurality of connecting discharge pipes for guiding the refrigerant discharged from the cylinder to the discharge pipe are provided. Refrigerant compressor. 2. The refrigerant compressor according to claim 1, wherein the plurality of connecting discharge pipes extend in opposite directions from the cylinder and are connected to the discharge pipes. 3. An electric element provided in a closed container and having a rotary shaft, and a compression element provided in the closed container and driven by the electric element to suck and compress the refrigerant into the cylinder and discharge it outside the cylinder. In the refrigerant compressor provided with a discharge pipe for discharging the refrigerant to the outside of the closed container provided in the closed container, a connecting discharge pipe for guiding the refrigerant discharged from the cylinder to the discharge pipe, A refrigerant compressor, wherein a plurality of refrigerant compressors are arranged in the axial direction.