JPS6355389A - Closed type rotary compressor - Google Patents

Abstract

(57) [Abstract] 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 hermetic rotary compressor constituting a refrigeration cycle.

2. Description of the Related Art Examples of conventional closed rotary compression are shown in FIGS. 3 and 4.
This will also be explained based on FIG.

A conventional hermetic rotary compressor has a structure in which an electric motor element 21, a compression m element 22, etc. are provided in a hermetically sealed container 23.

Furthermore, the electric VJ machine element 21 is composed of a stator 24 and a rotor 25. On the other hand, the compressor element 2
2 is a crankshaft 26 fixed to the rotor 25;
A piston 27 is rotatably fitted to the eccentric portion of the crankshaft 26, and a piston 27 that houses the piston 27.
The crankshaft 26 is composed of a cylindrical cylinder 28 whose outer peripheral surface and inner surface are in contact with each other, and a bearing end plate 29 which closes openings on both end surfaces of the cylinder 28 and rotatably supports the crankshaft 26. Furthermore, it protrudes from the inner wall of the cylinder 28 toward the inside of the cylinder 28, and its tip contacts the outer periphery of the piston 27 to perform reciprocating motion following the obstruction of the piston 27, thereby sucking the refrigerant into the cylindrical chamber of the cylinder 28. A partition plate 32 is provided to divide the chamber 3G and the compression chamber 31. A notch 33 is provided at the end of the partition plate 32 opposite to the side that is in contact with the piston 27, and one end of the cylindrical coil spring 34 is inserted into this notch 33.
-). Moreover, this cylindrical coil spring 34 is housed to guide the reciprocating movement of the partition plate 32, and the Ii! ! A dynamic guide 35 is provided on the wall of the cylinder 28 . Note that the bearing end plate 29
A discharge port 36 for the compressed refrigerant from the compression chamber 31 to the closed container 23 is provided on the side of the compression chamber 31 .

Further, a refrigerant accumulator 37 is connected to the suction chamber 30, and a compressed refrigerant discharge pipe 38 is connected to the closed container 23.
is provided.

The operation of the conventional hermetic rotary compressor configured as described above will be described below.

The crankshaft 26 is driven by the won element 21,
A piston 27 rotatably fitted to the eccentric portion 26a of the crankshaft 26 rotates along the inner circumference of the cylinder 28.

The partition plate 32 is biased toward the piston 27 by a cylindrical coil spring 34 whose one end is exposed in the notch 33, and reciprocates with its tip in contact with the piston 27. The refrigerant compressed by the rotational movement of the piston 27 is transferred to the bearing end plate 2.
The refrigerant is discharged into the closed container 23 from the discharge port 36 provided in the refrigerant 9, and the inside of the closed container 23 is filled with high-pressure refrigerant during operation.

On the other hand, since the MvJ guide part 35 that accommodates the cylindrical coil spring 34 and guides the reciprocating movement of the partition plate 32 is open to the inside of the closed container 23, this sliding guide part 35 is also filled with the discharged high-pressure refrigerant. It's filled. Therefore, the partition plate 32
In addition to the biasing force of the cylindrical coil spring 34, the high pressure of the refrigerant is added.

Problems to be Solved by the Invention However, in the a-configuration as described above, since high-pressure refrigerant pressure is applied to the side of the notch 33 of the partition plate 32, the attachment of the partition plate 32 to the piston 27 is difficult. The force increases, and the frictional force at the contact portion between the partition plate 32 and the outer periphery of the piston 27 increases. For this reason, there is a problem in that the increased frictional force (I:Q) increases the driving force required to rotate the crankshaft 26, leading to a decrease in mechanical efficiency. Furthermore, wear on the contact area between the outer periphery of the piston 27 and the partition plate 32 increases, leading to a shortened lifespan of the hermetic rotary compressor.
There were 11 questions.

The present invention solves these problems by reducing the frictional force between the outer periphery of the piston and the partition plate, thereby reducing wear on the contact area between the piston and the partition plate, and improving machine efficiency. The purpose is to achieve this goal.

Means for solving the r:rJ problem Therefore, in order to solve the above-mentioned problems, the present invention provides an electrical appliance in a closed container. A lJ machine element and a compression v1 element are provided, and the compressor element includes a crankshaft connected to the electric motor element, a piston rotatably fitted to the eccentric part of the crankshaft, and an inner space for housing the piston. a cylindrical cylinder whose circumferential surface is in line contact with the outer circumferential surface of the piston; a bearing end plate that closes both end surfaces of the cylinder and rotatably supports the crankshaft; a partition plate that protrudes from the piston and makes a reciprocating motion following the movement of the piston with its tip touching the outer periphery of the piston, and divides the inside of the cylinder into a refrigerant suction chamber and a compression chamber, and the piston of the partition plate A layered motion guide is provided with a spring that fits into a notch provided in an end face opposite to the side and urges the partition plate toward the inside of the cylinder, and houses this spring and guides the reciprocating movement of the partition plate. A closed rotary type in which a chamber is provided in the wall of the cylinder, and a communication hole is provided in the wall of the sealed container for sealing the entire sliding guide chamber and introducing pressure from outside the sealed container into the sliding guide chamber. Provide compressors.

Effects According to the above structure, the partition plate is high enough to prevent a jumping phenomenon in which the partition plate is pushed out to the outer circumferential side and the suction chamber and the compression chamber are in communication with each other due to the high pressure inside the cylinder. In addition to the biasing force of the spring, an external pressure low enough to alleviate the contact friction force between the plate and the outer periphery of the piston can be applied to the notch side of the partition plate through the communication hole.

Embodiment An embodiment of the present invention will be described based on FIG. 1 J3 and FIG. 2.

Note that the present invention is characterized by an m-structure that applies a biasing force to the partition plate, and the other configurations are the same as the conventional example and are not shown in FIGS. 3, 4, and 5, so detailed explanation thereof will be Omitted. In the figure, a piston 2 rotatably fitted to a crankshaft 1
is housed in the cylinder 3 with its outer periphery in contact with the inner periphery of the cylindrical cylinder 3. Both end surfaces of the cylinder 3 are closed by bearing end plates 4 that rotatably support the crankshaft 1. Inside the wall of the cylinder 3, the cylindrical shape of the cylinder 3 protrudes from the wall toward the inside of the cylinder 3, touches the outer periphery of the piston 2 with its tip, and makes a reciprocating motion that follows the movement of the piston 2. The room is connected to the refrigerant suction chamber 5 and the pressure F
A partition plate 7 is provided to separate the fi room 6 and the fi room 6. A discharge port 9 for the compressed refrigerant into the closed container 8 is provided on the side of the compression chamber 6 of the bearing end plate 4 . A notch 10 is provided at the end of the partition plate 7 opposite to the side that contacts the piston 2, and a spring 11 for biasing the partition plate 7 toward the piston 2 is installed. ! I'm playing. This spring 11 and the partition plate 7
is housed in a sliding guide chamber 12 provided on the wall of the cylinder 3, and the partition plate 7 is guided into this sliding guide chamber 12 during reciprocating motion. This sliding guide chamber 12 is
It is sealed by an extended bearing end plate 4. A communication hole 13 is provided in the wall of the sealed container 8 for introducing pressure from outside of the sealed container 8 into the sealed sliding guide chamber 12 .

In the above configuration, in addition to the biasing force of the spring applied to the partition plate 7, an appropriate external pressure can be introduced into the sealed sliding guide chamber 12 through the communication hole 13. That is, the high pressure of the refrigerant in the cylinder 3 is high enough not to cause a jumping phenomenon in which the partition plate 7 is pushed outward and the suction chamber 5 and the compression chamber 6 are brought into communication. Oscillation I with the outer circumference of piston 2! An external pressure low enough to alleviate J friction may be added to the biasing force of the spring 11 and introduced into the sliding guide chamber 12.

In order to apply such an appropriate total biasing force to the partition plate 7,
When air at normal temperature and pressure is introduced, a spring 11 that can generate a value obtained by subtracting air pressure from the above-mentioned pressure may be selected.

However, since the internal pressure of the cylinder 3 fluctuates depending on the ambient conditions (for example, ambient temperature) of the equipment in which this hermetic rotary compressor is installed, the necessary The total biasing force also changes. Therefore, an external pressure is added to the urging force of the spring 11 to apply a total urging force to the partition plate 7 according to this variation, and the sliding guide hole 12
It is preferable to introduce it into

As this external pressure, a branch pipe is branched from the middle between the compressed refrigerant discharge pipe and the accumulator in the refrigeration cycle of the equipment in which this compressor is installed, and the internal pressure of this branch pipe is transferred to the sliding guide chamber. Preferably, it is introduced at 12.

This pressure is proportional to the pressure inside the cylinder 3, which varies depending on the ambient conditions as described above, and can reduce the contact friction force between the partition plate 7 and the outer periphery of the piston 2 without causing jumping of the partition plate 7. It's pressure.

Effects of the Invention As described above, the present invention prevents the jumping phenomenon of the partition plate by providing a communication hole for introducing external pressure to make the biasing force on the partition plate an appropriate value. Moreover, it is possible to reduce the frictional force between the piston outer circumference and the partition plate, reduce wear on the sliding parts between the piston outer circumference and the partition plate, and improve mechanical efficiency, resulting in high performance and high reliability. A closed-type rotary compressor can be provided.

4. Explanation of Drawing No. rfU111 Fig. 1 is a cross-sectional view of a compressor element according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the same compressor element, and Fig. 3 is a conventional closed type rotary compression. The longitudinal cross-sectional view of the machine, FIGS. 4 and 5, are a cross-sectional view and a longitudinal cross-sectional view, respectively, of the compression-specific elements in FIG. 3.

2... Piston, 3... Cylinder, 5... Partition plate, 7... Bearing end plate, 11... Spring, 12... Sliding guide chamber, 13... Communication hole.

Agent Hiroshi Mori Moto Figure 1 2- Piston 3-8. Shin9 link 7-Makura T777 class //-' (Ding /3...[Chuuri] Figure 2 4-axis Kanhanawa class 12-Inside sliding rack 1 Figure 3 Figure 4

Claims (1)

[Claims] 1. A motor element and a compressor element are provided in a sealed container,
The compressor element houses a crankshaft connected to the electric motor element, a piston rotatably fitted to an eccentric portion of the crankshaft, and the piston is housed, and an inner peripheral surface thereof is in line contact with an outer peripheral surface of the piston. a cylindrical cylinder; a bearing end plate that closes both end surfaces of the cylinder and rotatably supports the crankshaft; and a bearing end plate that protrudes from the wall of the cylinder toward the inside of the cylinder and has a tip contacting the outer periphery of the piston. The cylinder is configured with a partition plate that performs reciprocating motion following the movement of the piston and divides the inside of the cylinder into a refrigerant suction chamber and a compression chamber, and a notch provided on the end surface of the partition plate on the opposite side to the piston side. A spring is provided in the wall of the cylinder for accommodating the spring and for guiding the reciprocating movement of the partition plate. A sealed rotary compressor in which the entire guide chamber is sealed and a communication hole is provided in the wall of the sealed container for introducing pressure from outside the sealed container into the sliding guide chamber.