JP2005220793A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor enabling the use of carbon dioxide as a refrigerant and the use of a container formed of an aluminum material and having a sleeve of simple structure fixed to the outer wall of the container with sufficient strength. <P>SOLUTION: In this compressor, compression elements 32 and 34 and a refrigerant inlet pipe 94 and a refrigerant discharge pipe 96 having one ends inserted and connected to sleeves 143A and 144A fixedly inserted into the side wall of the container 12 are installed in the container 12. The refrigerant led from the refrigerant inlet pipe 94 is compressed by the compression elements, and the compressed refrigerant is discharged from the refrigerant discharge pipe 96. The portions 143B of the sleeves on the inside of the container 12 are formed in a tapered shape having an outside diameter larger than the outside diameter of a sleeve body, the portions 12C of the corresponding receiving parts on the inside of the container 12 are formed in a tapered shape corresponding to that tapered shape, and the sleeves are inserted into the container side wall from the inside of the container 12 to hold and fixedly tighten the container side wall. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressor, and more particularly to a compressor provided with a container made of an aluminum material using carbon dioxide among natural refrigerants.

Conventionally, chlorofluorocarbon (R11, R12, R134a, etc.) is generally used as a refrigerant in the refrigeration cycle. However, when CFCs are released into the atmosphere, they have problems such as a large warming effect and ozone layer destruction. For this reason, in recent years, other natural refrigerants having little influence on the environment, such as oxygen (O ₂ ), carbon dioxide (CO ₂ ), hydrocarbon (HC), ammonia (NH ₃ ), and water (H ₂ O), are used. Research on use as a refrigerant has been conducted. Among these natural refrigerants, oxygen and water are low in pressure and difficult to use as refrigerants in the refrigeration cycle, and ammonia and hydrocarbons are flammable, and therefore have a problem that they are difficult to handle. For this reason, a compressor using carbon dioxide has been proposed (see Patent Document 1).

  Conventionally, this type of compressor accommodates an electric element or a compression element as a driving element in a container, and a refrigerant introduced into the cylinder of the compression element on the side surface of the container and a refrigerant compressed by the compression element A sleeve for connecting a refrigerant discharge pipe for discharging the gas is welded and fixed from the outside of the container, and one end of a refrigerant introduction pipe and a refrigerant discharge pipe communicating with the cylinder are inserted into and connected to the sleeve. (For example, refer to Patent Document 2).

Next, an example of a conventional compressor will be described with reference to FIG.
In FIG. 4, reference numeral 10 denotes an internal intermediate pressure type multi-stage compression rotary compressor that uses carbon dioxide (CO ₂ ) as a refrigerant. And the lower rotary compression element 32 (first stage) and the upper rotary compression element 34 (lower stage) driven by the rotating shaft 16 of the electric element 14. The rotary compression mechanism unit 18 is composed of a second stage).
The sealed container 12 has an oil reservoir at the bottom, a container body 12A that houses the electric element 14 and the rotary compression mechanism 18, and a generally bowl-shaped end cap (lid body) 12B that closes the upper opening of the container body 12A. A circular mounting hole 12D is formed in the center of the upper surface of the end cap 12B, and a terminal (wiring is omitted) 20 for supplying power to the electric element 14 is mounted in the mounting hole 12D. It has been.

The electric element 14 is a so-called magnetic pole concentrated winding type DC motor, and includes a stator 22 attached in an annular shape along the inner peripheral surface of the upper space of the hermetic container 12 and a slight gap inside the stator 22. And a rotor 24 inserted and installed. The rotor 24 is fixed to a rotating shaft 16 that passes through the center and extends in the vertical direction.
The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. Further, the rotor 24 is formed of a laminated body 30 of electromagnetic steel sheets, like the stator 22, and is formed by inserting a permanent magnet MG into the laminated body 30.
An intermediate partition plate 36 is sandwiched between the lower rotary compression element 32 and the upper rotary compression element 34. That is, the lower rotary compression element 32 and the upper rotary compression element 34 include an intermediate partition plate 36, an upper cylinder 38 and a lower cylinder 40 disposed above and below the intermediate partition plate 36, and the upper and lower cylinders 38, 40. The upper and lower rollers 46 and 48 are rotated omnidirectionally by upper and lower omnidirectional portions 42 and 44 provided on the rotating shaft 16 with a phase difference of 180 degrees, and the upper and lower cylinders are in contact with the upper and lower rollers 46 and 48. 38 and 40 are divided into a low pressure chamber side and a high pressure chamber side, respectively, and the upper opening surface of the upper cylinder 38 and the lower opening surface of the lower cylinder 40 are closed to support the bearing of the rotary shaft 16. An upper support member 54 and a lower support member 56 are also used as supporting members.

On the other hand, the upper support member 54 and the lower support member 56 are respectively provided with a suction passage 60 (the upper suction passage is not shown) that communicates with the inside of the upper and lower cylinders 38 and 40 through a suction port (not shown), and a part thereof is recessed. Discharge silencing chambers 62 and 64 formed by closing the recessed portion with an upper cover 66 and a lower cover 68 are provided.
The discharge silencer chamber 64 and the inside of the sealed container 12 are communicated with each other through a communication passage that penetrates the upper and lower cylinders 38 and 40 and the intermediate partition plate 36, and an intermediate discharge pipe 121 is provided upright at the upper end of the communication passage. The intermediate pressure refrigerant gas compressed by the lower rotary compression element 32 is discharged from the intermediate discharge pipe 121 into the sealed container 12.

Carbon dioxide (CO ₂ ) is used as the refrigerant, and the oil as the lubricating oil is, for example, an existing oil such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, PAG (polyalkyl glycol), or the like. used.

On the side surface of the container main body 12A of the sealed container 12, the suction passage 60 (upper side is not shown) of the upper support member 54 and the lower support member 56, the discharge silencer chamber 62, the upper side of the upper cover 66 (on the lower end of the electric element 14). The sleeves 142 and 143 are fixed by welding at positions corresponding to the substantially corresponding positions.
In addition, one end of a refrigerant introduction pipe 94 for introducing refrigerant gas into the lower cylinder 40 is inserted and connected in the sleeve 142, and one end of the refrigerant introduction pipe 94 communicates with the suction passage 60 of the lower cylinder 40. Further, one end of a refrigerant discharge pipe 96 is inserted and connected into the sleeve 143, and one end of the refrigerant discharge pipe 96 communicates with the discharge silencer chamber 62.

When the stator coil 28 of the electric element 14 of the compressor 10 is energized via the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the upper and lower rollers 46 and 48 fitted to the upper and lower eccentric portions 42 and 44 provided integrally with the rotary shaft 16 rotate eccentrically in the upper and lower cylinders 38 and 40.
Thereby, the low-pressure refrigerant gas sucked into the low-pressure chamber side of the cylinder 40 from the suction port (not shown) via the suction passage 60 formed in the refrigerant introduction pipe 94 and the lower support member 56 is transferred between the roller 48 and the vane 52. It is compressed by the operation to become an intermediate pressure, and is discharged from the intermediate discharge pipe 121 into the sealed container 12 through a communication path (not shown) from the high pressure chamber side of the lower cylinder 40. Thereby, the inside of the sealed container 12 becomes an intermediate pressure.
The refrigerant discharged into the sealed container 12 is cooled by removing heat from the sealed container 12.

  The intermediate-pressure refrigerant gas is drawn into a low pressure chamber side of the upper cylinder 38 of the upper rotary compression element 34 from a suction port (not shown) via a suction passage (not shown) formed in the upper support member 54, and the roller 46. The second stage of compression is performed by the operation of the vane 50 to generate high-pressure and high-temperature refrigerant gas, and from the high-pressure chamber side, through a discharge port (not shown), and through a discharge silencer chamber 62 formed in the upper support member 54, a refrigerant discharge pipe 96. More discharged to the outside.

In recent years, a sealed container made of an aluminum-based material has been proposed in order to reduce the weight of the compressor (see, for example, Patent Document 3).
Japanese Patent Laid-Open No. 10-19401 JP 2000-1046889 A Japanese Patent Application No. 2003-077983

However, when carbon dioxide is used as refrigerant, refrigerant pressure reaches even about 150 kg / cm ² G on the high pressure side, to be about 30-40 kg / cm ² G in the low pressure side, carbon dioxide is used as refrigerant refrigerator In the cycle, the refrigerant pressure is higher than that of Freon.
Here, generally, a technique of welding a sleeve to a container using a silver-copper-zinc or alloy such as cadmium, nickel and tin called silver solder as a welding rod has been used. In the refrigeration cycle used as the refrigerant, the refrigerant pressure is higher than that of Freon, so that there is a problem that the connecting portion of the sleeve fixed by welding is damaged.

  In addition, aluminum-based materials have the advantage of being significantly lighter than steel plates, but when heat such as welding is applied, the strength suddenly decreases and the sealed container is deformed, so the sleeve is welded from the outside of the container. However, there was a problem that sufficient strength could not be secured.

  An object of the present invention is a compressor that can solve various problems of the prior art and can use carbon dioxide as a refrigerant or a container made of an aluminum material without significant changes. Another object of the present invention is to provide a compressor in which a sleeve having a simple structure is secured to an outer wall of a container while securing sufficient strength.

A compressor according to claim 1 of the present invention for solving the above-mentioned problems is provided with a compression element in a container, a refrigerant introduction pipe and a refrigerant discharge pipe having one end inserted and connected in a sleeve inserted and fixed to the side wall of the container. A compressor that compresses the refrigerant introduced from the refrigerant introduction pipe with the compression element, and discharges the compressed refrigerant from the refrigerant discharge pipe.
The inner portion of the sleeve has a tapered or stepped shape with an outer diameter larger than the outer diameter of the sleeve body, and the corresponding inner portion of the container on the receiving side corresponds to the tapered or stepped shape. The sleeve is tapered or stepped, and the sleeve is inserted into the container side wall from the inside of the container, and the container side wall is sandwiched and fastened.

  The compressor according to claim 2 of the present invention is characterized in that in the compressor according to claim 1, a sealing material or a gasket is interposed between the sleeve and the side wall of the container.

  A compressor according to claim 3 of the present invention is the compressor according to claim 1 or 2, wherein the container is made of an aluminum-based material.

  A compressor according to a fourth aspect of the present invention is the compressor according to any one of the first to third aspects, wherein the refrigerant is carbon dioxide.

The compressor according to claim 1 of the present invention includes a compression element in a container, a refrigerant introduction pipe and a refrigerant discharge pipe having one end inserted and connected in a sleeve inserted and fixed to the side wall of the container, and the refrigerant introduction pipe In the compressor that compresses the refrigerant introduced from the compression element with the compression element and discharges the compressed refrigerant from the refrigerant discharge pipe,
The inner portion of the sleeve has a tapered or stepped shape with an outer diameter larger than the outer diameter of the sleeve body, and the corresponding inner portion of the container on the receiving side corresponds to the tapered or stepped shape. It is tapered or stepped, and the sleeve is inserted into the container side wall from the inside of the container and sandwiched between the container side walls, and is fastened and fixed by, for example, welding or using a nut without welding. So
For example, even when carbon dioxide is used as a refrigerant, a high refrigerant pressure during operation uniformly presses the tapered or stepped portion of the sleeve from the inside of the container, and the tapered shape inside the corresponding receiving side container In addition, it acts to improve and enhance the pressing contact with the stepped shape portion, so that the connecting portion of the sleeve is not damaged, durability and reliability are improved, and a nut is used instead of welding. If fastened and fixed, even if a container made of aluminum material is used, heat is not applied, so the strength does not decrease, the container does not deform, and the sleeve is secured to the container side wall with practically sufficient strength. It is possible to fix them and to achieve a remarkable effect that the weight can be reduced.

  The compressor according to claim 2 of the present invention is the compressor according to claim 1, wherein a sealing material or a gasket is interposed between the sleeve and the side wall of the container. There is a further remarkable effect that there is no leakage.

  The compressor according to claim 3 of the present invention is the compressor according to claim 1 or 2, wherein the container is made of an aluminum-based material, but is fastened with a nut instead of welding the sleeve. Further, there is a further remarkable effect that the sleeve can be secured to the side wall of the container while securing a practically sufficient strength without lowering or deforming the container.

  The compressor according to claim 4 of the present invention is the compressor according to any one of claims 1 to 3, wherein the refrigerant is carbon dioxide, but during operation, a high refrigerant pressure is the tapered shape or stepped shape. This portion is pressed uniformly from the inside of the container to act to improve and improve the contact, so that the connection portion of the sleeve is not damaged.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of a compressor according to the present invention, in which a cylindrical sealed container 12 made of an aluminum-based metal is used, carbon dioxide is used as a refrigerant, and a sleeve 142A is provided on the side of the container body 12A of the sealed container 12. And 143A are inserted into the container side wall, sandwiched between the container side walls, and fastened and fixed using a nut 70, the same as the compressor 10 shown in FIG.
Since the sleeves 142A and 143A have the same configuration, the sleeve 143A will be described below.
An inner portion 143B of the container body 12A of the sleeve 143A has a tapered shape having an outer diameter D larger than the outer diameter d of the sleeve body 143C, and the inner side of the receiving container body 12A corresponding to the tapered portion 143B. The portion 12C has a tapered shape having an angle and a size corresponding to the configuration of the taper angle and size of the tapered portion 143B.

FIG. 2 is an explanatory view schematically illustrating a state when the sleeve 143A is inserted into the container body 12A.
As shown in FIG. 2, the sleeve 143A is inserted into a predetermined position on the side wall of the container body 12A in the direction of the arrow from the inside of the container body 12A. Although not shown, after insertion, the container wall is sandwiched and fastened and fixed using a nut 70.

  Although not shown, a seal material made of a material such as metal, rubber, synthetic rubber, engineering plastic, or a composite material at any appropriate position of the contact portion including the fastening portion of the sleeve 143A and the container main body 12A, or If a gasket is interposed, the airtightness is further improved, and refrigerant leakage or the like is eliminated.

In the compressor 10 of the present invention, the sealed container 12 is made of an aluminum-based metal. However, since the sleeve 143A is clamped and fixed using a nut 70 with the container side wall sandwiched, the sealed container 143A is fixed when the sleeve 143A is fastened. Therefore, the sleeve 143A can be secured to the side wall of the container while securing a practically sufficient strength.
Carbon dioxide is used as the refrigerant. When the compressor 10 is operated, the high refrigerant pressure uniformly presses the tapered portion 143B of the sleeve 143A from the inside of the sealed container 12, and the receiving side corresponding to this portion 143B. This acts to improve and enhance the pressing contact with the tapered portion 12C inside the container body 12A, so that the connecting portion of the sleeve 143A is not damaged.

In the above description, the sleeve 143A is clamped and fixed using the nut 70 with the container side wall of the sealed container 12 interposed therebetween. Instead of using the nut 70, an appropriate welding method is selected from known welding methods. Then, the sleeve 143A can be clamped and fixed by sandwiching the container side wall of the sealed container 12 under the condition that the strength of the sealed container 12 is not lowered or deformed by welding. A means for clamping and fixing the container side wall is not particularly limited.
Even in the case of the welding method, the sealing material or the gasket can be interposed at any appropriate position of the contact portion including the fastening and fixing portion of the sleeve 143A and the container main body 12A, but the sealing material or the gasket need not be interposed. Sometimes it is good.
However, when the sealed container 12 made of an aluminum material is used and carbon dioxide is used as the refrigerant, heat is not applied when the sleeve 143A is fastened and fixed, so that the strength of the sealed container 12 is reduced or deformed. For reasons such as not occurring, it is preferable to fasten and fix using the nut 70.

FIGS. 3A and 3B are explanatory views schematically illustrating a state when another sleeve is inserted into the container main body 12A.
A portion 145B inside the container body 12A of the sleeve 154A shown in FIG. 3A has a single stepped shape having an outer diameter D larger than the outer diameter d of the sleeve main body 145C, and this single stepped shape. The inner portion 12E of the receiving-side container body 12A corresponding to the portion 145B has a one-step step having a structure corresponding to each step, such as the number of steps and dimensions of the step-shaped portion 145B. It has a shape.
As shown in FIG. 3A, the sleeve 145A is inserted into a predetermined position on the container side wall of the container body 12A from the inside of the container body 12A in the direction of the arrow. Although not shown, after insertion, the container wall is sandwiched and fastened and fixed using a nut 70. As described above, the means for fastening and fixing the sleeve 145A by sandwiching the container side wall of the sealed container 12 may be welding as long as appropriate welding is performed, and the means for fastening and fixing the sleeve 145A is not particularly limited.

The portion 144B inside the container body 12A of the sleeve 144A shown in FIG. 3B has a two-stepped shape having an outer diameter D larger than the outer diameter d of the sleeve body 144C, and this two-stepped shape. A portion 12D inside the container body 12A on the receiving side corresponding to the portion 144B of the step has two steps having a structure corresponding to each constitution such as the number of steps of the stepped portion 144B and the size of the stepped shape 144B. It has a shape.
As shown in FIG. 3B, the sleeve 144A is inserted into a predetermined position on the container side wall of the container main body 12A in the arrow direction from the inside of the container main body 12A. Although not shown, after insertion, the container wall is sandwiched and fastened and fixed using a nut 70. As described above, the means for fastening and fixing the sleeve 144A by sandwiching the container side wall of the sealed container 12 may be welding as long as appropriate welding is performed, and means for fastening and fixing the sleeve 144A is not particularly limited.
Although not shown in the drawing, if a sealing material or gasket made of the above-described material is interposed at any appropriate location of the contact portion including the fastening portion of the sleeve 145A and the sleeve 144A and the container body 12A, the airtightness is further enhanced. This eliminates refrigerant leakage.

In the above description, an example in which the sealed container 12 is made of an aluminum-based metal has been shown. However, an iron-based metal or the like may be used, and the material constituting the sealed container 12 is not particularly limited. However, when an aluminum-based material is used, the weight can be reduced, so that it can be preferably used in the present invention.
The material of the sleeves 143A, 144A, the nut 70, etc. may be aluminum metal or iron metal, and is not particularly limited. However, when an aluminum-based material is used, the weight can be reduced, so that it can be preferably used in the present invention.

And if it supplies with electricity to the stator coil 28 of the electric element 14 of the compressor 10 of this invention through the terminal 20 and the wiring which is not shown in figure, the electric element 14 will start and the rotor 24 will rotate. By this rotation, the upper and lower rollers 46 and 48 fitted to the upper and lower eccentric portions 42 and 44 provided integrally with the rotary shaft 16 rotate eccentrically in the upper and lower cylinders 38 and 40.
Thereby, the low-pressure refrigerant gas sucked into the low-pressure chamber side of the cylinder 40 from the suction port (not shown) via the suction passage 60 formed in the refrigerant introduction pipe 94 and the lower support member 56 is transferred between the roller 48 and the vane 52. It is compressed by the operation to become an intermediate pressure, and is discharged from the intermediate discharge pipe 121 into the sealed container 12 through a communication path (not shown) from the high pressure chamber side of the lower cylinder 40. Thereby, the inside of the sealed container 12 becomes an intermediate pressure.
The refrigerant discharged into the sealed container 12 is cooled by removing heat from the sealed container 12. The intermediate-pressure refrigerant gas is drawn into a low pressure chamber side of the upper cylinder 38 of the upper rotary compression element 34 from a suction port (not shown) via a suction passage (not shown) formed in the upper support member 54, and the roller 46. Then, the second stage of compression is performed by the operation of the vane 50 to form high-pressure and high-temperature refrigerant gas, and from the high-pressure chamber side, through a discharge port (not shown), and through a discharge silencer chamber 62 formed in the upper support member 54, a refrigerant discharge pipe 96. More discharged to the outside.

  The description of the above embodiment is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope thereof. Moreover, each part structure of this invention is not restricted to the said embodiment, For example, the following various deformation | transformation are possible within the technical scope as described in a claim.

In the above description, the two-stage compression rotary compressor has been described. However, the present invention is not particularly limited in the form of the compressor, and specifically, a reciprocating compressor, a vibration compressor, and a multi-vane rotary compressor. A scroll compressor or the like may be used, and the number of compression stages may be at least one stage of compression.
In the above description, the example in which the electric element is provided in the sealed container has been described. However, the electric element may be provided outside the sealed container.

  The compressor of the present invention includes a home air conditioner, a commercial air conditioner (package air conditioner), an automotive air conditioner, a home refrigerator, a commercial refrigerator, a commercial freezer, a commercial freezer refrigerator, a showcase, a vending machine, a water heater, etc. It can be used for.

The compressor of the present invention includes a compression element in a container, a refrigerant introduction pipe having one end inserted and connected in a sleeve inserted and fixed to the side wall of the container, and a refrigerant discharge pipe, and the refrigerant introduced from the refrigerant introduction pipe In the compressor that compresses the compressed refrigerant with the compression element and discharges the compressed refrigerant from the refrigerant discharge pipe,
The inner portion of the sleeve has a tapered or stepped shape with an outer diameter larger than the outer diameter of the sleeve body, and the corresponding inner portion of the container on the receiving side corresponds to the tapered or stepped shape. It is tapered or stepped, and the sleeve is inserted into the container side wall from the inside of the container and sandwiched between the container side walls, and is fastened and fixed by, for example, welding or using a nut without welding. Therefore, a sleeve with a simple structure can be secured to the side wall of the container with sufficient strength without significant changes, and carbon dioxide, which is a natural refrigerant, is used as a refrigerant, or a container made of aluminum is used. It can be used, and the durability and reliability are improved and the weight can be reduced. Therefore, the industrial utility value is high.

It is a section explanatory view explaining one embodiment of the compressor of the present invention. It is explanatory drawing which illustrates typically the state at the time of inserting a sleeve in the predetermined location of a container wall. (A), (b) is explanatory drawing which illustrates typically the state at the time of inserting another sleeve in the predetermined location of a container wall. It is sectional explanatory drawing explaining the conventional compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotary compressor 12 Airtight container 12A Container main body 12C Tapered part 12D inside container main body Stepped part 12E inside container main body Stepped part 14 inside container main body Electric element 18 Rotary compression mechanism part 32 Lower stage Rotary compression element 34 Upper rotary compression element 70 Nut 94 Refrigerant introduction pipe 96 Refrigerant discharge pipes 142, 143, 142A, 143A, 144A, 145A Sleeve 143B Tapered portions 144B, 145B Stepped portions 143C, 144C, 145C Sleeves Main body d Outer diameter of sleeve main body D Outer diameter of tapered portion and stepped portion of sleeve

Claims (4)

A compression element is provided in the container, and a refrigerant introduction pipe and a refrigerant discharge pipe having one end inserted and connected in a sleeve inserted and fixed to the side wall of the container, and the refrigerant introduced from the refrigerant introduction pipe is compressed by the compression element. In the compressor for discharging the compressed refrigerant from the refrigerant discharge pipe,
The inner portion of the sleeve has a tapered or stepped shape with an outer diameter larger than the outer diameter of the sleeve body, and the corresponding inner portion of the container on the receiving side corresponds to the tapered or stepped shape. A compressor having a tapered shape or a stepped shape, wherein the sleeve is inserted into the container side wall from the inside of the container, and the container side wall is sandwiched and fastened. The compressor according to claim 1, wherein a sealing material or a gasket is interposed between the sleeve and the container side wall. The compressor according to claim 1 or 2, wherein the container is made of an aluminum-based material. The compressor according to any one of claims 1 to 3, wherein the refrigerant is carbon dioxide.

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