KR20080062937A

KR20080062937A - Hermetic compressor

Info

Publication number: KR20080062937A
Application number: KR1020060139126A
Authority: KR
Inventors: 강완봉
Original assignee: 엘지전자 주식회사
Priority date: 2006-12-29
Filing date: 2006-12-29
Publication date: 2008-07-03

Abstract

A hermetic compressor is provided to reduce the number of parts and process steps by commonly using an intake pipe and to reduce the manufacturing cost by facilitating the fabrication of an accumulator and a casing. A hermetic compressor comprises a first cylinder(310) and a second cylinder(410). The first and second cylinders have refrigerant compression spaces(V1,V2) and intake ports(311,411) communicating with the compression spaces, respectively. The first and second cylinders are vertically installed in an internal space of a casing(100). A plurality of bearing plates(320) are installed between the first and second cylinders to separate the compression spaces from each other together with the cylinders. One intake pipe(710) is directly connected to the intake port of the first cylinder. The bearing plate has a communicating port(511) through which the intake port of the first cylinder communicates with the intake port of the second cylinder.

Description

Hermetic compressor {HERMETIC COMPRESSOR}

1 is a longitudinal sectional view showing an example of the rotary compressor of the present invention;

FIG. 2 is a perspective view of the compressor sphere broken in FIG. 1; FIG.

Figure 3 is a longitudinal sectional view showing a suction flow path of the compression mechanism in Figure 1,

4 is a longitudinal cross-sectional view illustrating a process of sucking refrigerant into the first cylinder of FIG. 1;

5 is a longitudinal cross-sectional view illustrating a process of sucking refrigerant into a second cylinder in FIG. 1;

Figure 6 is a longitudinal sectional view showing an example in which the suction flow path of the present invention is applied to a variable displacement rotary compressor.

** Description of symbols for the main parts of the drawing **

100: casing 200: electric mechanism part

300: first compression mechanism 311: first suction port

312: bypass hole 400: second compressor section

410: second cylinder 411: second suction port

411a: seating groove 500: intermediate bearing

511: communication port 550: guide member

551: step 600: accumulator

710: suction tube 720: discharge tube

F: Communication flow path V1, V2: First and second compression spaces

The present invention relates to a hermetic compressor, and more particularly to a hermetic compressor capable of supplying refrigerant to a plurality of cylinders with one suction tube.

In general, the hermetic compressor is provided with an electric mechanism unit for generating a driving force in the inner space of the hermetic casing and a compressor mechanism for compressing the refrigerant by receiving the driving force of the electric mechanism.

The hermetic compressor may be classified into a single hermetic compressor and a double hermetic compressor according to the number of cylinders.

Said single stage hermetic compressor has one suction tube connected to one cylinder, while the above is known.

However, when the suction pipes are independently connected to the plurality of cylinders as described above, the number of the suction pipes increases, thereby increasing the number of parts and increasing the number of assembly operations, thereby increasing the production cost.

In addition, since a plurality of suction pipes are connected to one accumulator and the plurality of suction pipes are connected to the casing, processing and assembly of the accumulator and the casing are difficult, thereby increasing production costs.

In addition, as the vibration generated in the compression mechanism is transmitted through the plurality of suction pipes, the plurality of suction pipes resonate with each other, thereby causing the compressor vibration.

The present invention solves the problems as described above, by using a suction tube in a double hermetic compressor having a plurality of cylinders in common to reduce the number of parts and assembly labor, and at the same time to facilitate the processing of the accumulator and casing, etc. It is an object of the present invention to provide a hermetic compressor that can reduce cost and prevent the vibration transmitted from the compression mechanism unit from being excited.

In order to achieve the object of the present invention, a plurality of cylinders each provided with a compression space; A suction pipe connected directly to only an intake port of one of the plurality of cylinders and indirectly communicating with an intake port of another cylinder through a communication flow path formed between the plurality of cylinders; And a guide member inserted into an inner circumferential surface of the communication passage to block leakage of the refrigerant.

In addition, the first cylinder is formed in each of the inlet port is formed so that the compression space in which the refrigerant is sucked and compressed and communicate with each of the compression space, and each of the inlet port is in communication with each other and installed up and down in the sealed inner space; Second cylinder; A plurality of bearing plates respectively provided between the first cylinder and the second cylinder and on the other side of the first cylinder and the second cylinder so as to separately form each compression space together with the plurality of cylinders; And one suction pipe directly connected to the suction port of the first cylinder, among the plurality of cylinders, wherein the bearing plate provided between the both cylinders is configured such that the suction port of the first cylinder communicates with the suction port of the second cylinder. There is provided a hermetic compressor through which a communication passage is formed, and a tube-shaped guide member is inserted between the suction port and the communication port to block leakage of the refrigerant.

Hereinafter, the hermetic compressor according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

1 to 5 show a double rotary compressor as an example of the hermetic compressor of the present invention.

As shown in FIG. 1, the double rotary compressor according to the present invention includes an electric mechanism part 200 generating a driving force on an upper side of a closed space of the casing 100, and a lower side of the closed space of the casing 100. The first compression mechanism unit 300 and the second compression mechanism unit 400 are installed to compress the refrigerant by the rotational force generated by the mechanism unit 200.

The first compression mechanism 300 is the first cylinder 310, the upper bearing plate (hereinafter, the upper bearing) 320, the first rolling piston 330, the first vane 340, the first The discharge valve 350 and the first muffler 360.

The second compression mechanism 400 includes a second cylinder 410, a lower bearing 420, a second rolling piston 430, a second vane 440, a second discharge valve 450, And a second muffler 460.

An intermediate bearing separating the first compression space V1 of the first cylinder 310 and the second compression space V2 of the second cylinder 410 between the first cylinder 310 and the second cylinder 410. Plate (hereinafter, intermediate bearing) 500 is installed.

Here, one suction pipe 710 connected to the accumulator 600 is connected to the lower half of the casing 100, and the first compression mechanism 300 and the second compression mechanism 400 are connected to the upper end of the casing 100. One discharge pipe 720 is connected so that the refrigerant discharged into the closed space is delivered to the refrigeration system.

The first suction port 311 of the first compression mechanism 300 is directly connected to the suction pipe 710, and the second suction port 411 of the second compression mechanism 400 is connected to the first compression mechanism 300. The first suction port 311 is connected in parallel through a communication flow path (F), the refrigerant flow path (F) between the interface between the first cylinder 310, the intermediate bearing 500 and the second cylinder (410) The tube-shaped guide member 550 is inserted and fixed to block leakage.

The communication flow path F is connected to the intermediate bearing 500 such that the bypass hole 312 formed in the middle of the first suction port 311 and the bypass hole 312 and the second suction port 411 communicate with each other. It consists of a communication port 511 is formed.

As shown in FIG. 2, the first suction port 311 is formed through the radial direction, the bypass hole 312 is formed through the intermediate bearing 500, the communication hole 511 is formed through the axial direction. The second suction port 411 is formed to be inclined toward the second compression space V2.

The bypass hole 312 may be formed to be smaller than or equal to the diameter of the first suction port 311, but in some cases, the stepped surface of the guide member 550, which will be described later, is caught and the insertion depth is limited. (Not shown) may be formed in the middle.

As shown in FIG. 3, the inlet end edge of the bypass hole 312 may be rounded or inclined to allow the refrigerant to smoothly flow into the communication port 511 from the first suction port 311.

The communication hole 511 may be formed with the same diameter as the bypass hole 312, but the stepped portion 551 of the guide member 550 to be described later is caught so that the insertion depth of the bypass hole 312 It may be formed smaller than the diameter.

In addition, the communication port 511 is formed so that the volume is about 1% to 10% of the volume of the compressed space of the second cylinder 410 is directly connected to the suction pipe to each cylinder (310, 410). Although it is preferable to prevent the compressor performance from being lowered, the volume of the communication port 511 is about 3% to 7% of the volume of the compression space V2 of the second cylinder 410 as shown in FIG. 7. It is more desirable that it be formed so as to reduce the compressor input.

The second suction port 411 is inclined so that the outlet end thereof can communicate with the inner circumferential surface of the second compression space (V2), the inlet end is seated so that the end of the guide member 550 to be described later can be inserted It is preferable that the groove 411a is expanded to block the leakage of the refrigerant between the intermediate bearing 500 and the second cylinder 410.

In addition, the second suction port 411 may be formed to be inclined by cutting the edge of the inner circumferential surface of the second cylinder 410 as shown in FIGS. 2 and 3, but the second cylinder 410 is not illustrated. It may be formed so as to be inclined to).

The guide member 550 is inserted and fixed through the bypass hole 312, the communication port 511, and the second suction port 411, as shown in FIGS. 2 and 3.

In addition, the guide member 550 may be formed of a material that is easily molded, such as plastic, or may be formed of a metal material to have strength.

In addition, the guide member 550 is formed to have the same diameter so that the outer peripheral surface of the guide member 550 can be pressed into the bypass hole 312 or the communication port 511, the bypass hole 312 on the end outer peripheral surface of the guide member 550 A stepped portion 551 is formed to be caught on the stepped surface (not shown) or the end surface of the communication port 511 of the intermediate bearing 500 to limit the indentation depth.

In addition, the guide member 550 is formed in a cylindrical shape in the drawing, in some cases may be formed in a polygonal shape. In this case, it is possible to prevent the guide member 550 from rotating in the communication passage F in advance, thereby increasing reliability.

In the drawing, reference numeral 210 denotes a stator, 220 denotes a rotor, and 230 denotes a rotating shaft.

Effects of the present invention of the double rotary compressor of the present invention are as follows.

That is, when the rotor 220 rotates by applying power to the stator 210 of the power mechanism unit 200, the rotation shaft 230 rotates together with the rotor 220 while the power mechanism unit 200 is rotated. The rotational force of the first compression mechanism 300 and the second compression mechanism 400, the first compression mechanism 300 and the second compression mechanism 400, respectively, the first rolling piston 330 and the first 2 the rolling piston 430 and the first vane 340 and the second vane 440 together with the first vane 340 and the second vane 440 while eccentric rotational movement in each of the first compression space (V1) and the second compression space (V2) A suction chamber having a phase difference is formed to suck the refrigerant.

For example, as shown in FIGS. 1 and 4, when the first compression space V1 starts a suction stroke, the refrigerant flows into the first suction port 311 through the accumulator 600 and the suction pipe 710. The refrigerant is sucked into the first compression space V1 through the first suction port 311 and compressed.

Also, as shown in FIGS. 1 and 5, the second cylinder 410 has a phase difference of 180 ° with the first compression space V1 during the compression stroke. Compression space (V2) also starts the suction stroke. In this case, the second suction port 411 of the second cylinder 410 communicates with the first suction port 311 of the first cylinder 310 through the communication port (including the bypass hole) 511. Refrigerant sucked into the first suction port 311 through the suction pipe 710 bypasses the bypass hole 312 and the communication port 511 and flows into the second suction port 411, and the refrigerant flows into the second compression space. It is sucked into V2 and compressed.

In this way, the refrigerant sucked into one suction pipe 710 is communicated with the first compression space V1 and the second compression space through the communication passage F between the first cylinder 310 and the second cylinder 410. By alternately suctioning to (V2), the number of parts can be reduced, as well as the suction pipe 710 to the casing 100 and the accumulator 600, as compared with the independent connection of the suction pipe to each cylinder (310, 410). The manufacturing cost for the connection can be reduced, thereby reducing the production cost.

In addition, as the compressor vibration generated in the first compression mechanism unit 300 and the second compression mechanism unit 400 is transmitted to one suction tube 710, the compressor vibration due to resonance is increased compared to using a plurality of suction tubes. Can be prevented in advance.

In addition, as the first cylinder 310, the intermediate bearing 500, and the second cylinder 410 are fastened by bolts, an assembly error may occur between the cylinders 310, 410 and the intermediate bearing 500. A fine gap may be generated, and high-pressure refrigerant leaks into the communication flow path F in the first compression space V1 or the second compression space V2 through the gap, and a 180 ° phase difference is caused by the pressure difference. The branch may be introduced into the other compression space to cause suction loss, but the guide member 550 inserted into the communication flow path F blocks the interface between the cylinders 310 and 410 and the intermediate bearing 500. Accordingly, the refrigerant in the high pressure side compression space under compression flows into the low pressure side compression space under suction, thereby effectively preventing the compressor performance from being lowered.

On the other hand, the double rotary compressor according to the present invention can be applied to a variable displacement double rotary compressor.

For example, in the variable displacement double type rotary compressor of the present embodiment, a vane chamber 412 is formed at a rear side of a second vane slot (unsigned) of the second cylinder 410 and separated from an inner space of the casing 100. The vane chamber 412 is connected to the mode switching means 800 that can supply the suction pressure or the discharge pressure according to the operation mode of the compressor. Even in this case, the suction pipe 710 is connected only to the first suction port 311 of the first cylinder 310, and the second suction port 411 of the second cylinder 410 is connected through the communication path F. FIG. The first suction port 311 is communicated with. Detailed configuration and operation thereof is similar to the conventional double rotary compressor described above, so a detailed description thereof will be omitted. The detailed configuration and operation thereof are similar to those of the conventional double rotary compressor described above, and thus detailed description thereof will be omitted.

In the hermetic compressor according to the present invention, a plurality of cylinder suction ports are communicated with each other through a communication flow path, and a suction pipe is connected only to one of the cylinder suction ports, so that the number of parts and accordingly The production cost is reduced by reducing the number of assembly processes, and the vibration of the compressor can be prevented from being increased due to the resonance compared to using a plurality of suction pipes, and a tube-shaped guide member is inserted into the communication flow path to block leakage of refrigerant. Compressor performance can be improved by blocking refrigerant leakage to the low pressure side.

Claims

A plurality of cylinders each provided with a compression space;

A suction pipe connected directly to only an intake port of one of the plurality of cylinders and indirectly communicating with an intake port of another cylinder through a communication flow path formed between the plurality of cylinders; And

And a guide member inserted into an inner circumferential surface of the communication passage to block leakage of the refrigerant.

The method of claim 1,

The guide member is provided on one side of the outer peripheral surface of the hermetic compressor characterized in that the stepped portion is formed to limit the insertion depth.

First and second cylinders each having a suction space formed therein so as to communicate with each of the compression spaces, and each suction hole communicates with each other and is installed up and down in an inner space of the sealed casing. cylinder; A plurality of bearing plates respectively provided between the first cylinder and the second cylinder and on the other side of the first cylinder and the second cylinder so as to separately form each compression space together with the plurality of cylinders; And one suction pipe connected directly to the suction port of the first cylinder among the plurality of cylinders.

The bearing plate provided between the two cylinders is formed with a communication port through which the suction port of the first cylinder communicates with the suction port of the second cylinder, a tube for blocking the leakage of the refrigerant between the suction port and the communication port ( A hermetic compressor, in which a guide member of a tube shape is inserted.

The method of claim 3,

At least one of the first cylinder and the second cylinder is a hermetic compressor characterized in that the sealing groove is further formed so that the end of the guide member is inserted.

The method of claim 3,

The guide member is provided on one side of the outer peripheral surface is formed with a stepped portion to limit the insertion depth, the stepped surface is formed in the cylinder or bearing plate corresponding to the stepped portion of the guide member.

The method of claim 5,

The stepped part is a hermetic compressor, characterized in that coupled to the side of the bearing plate installed between the cylinder.

The method of claim 3,

The inlet of the first cylinder is formed through the radial direction, the inlet of the second cylinder is hermetic compressor, characterized in that formed inclined at the outlet of the communication.