JP2001153048A - Hermetic motor-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a distortion inside a compression mechanism part from being produced by a stress caused by expansion and shrinkage of an outer suction pipe due to flame produced at the time of copper brazing work of the outer suction pipe, a suction pipe and a coolant pipe to be mounted to the suction side of the compression mechanism part inside a hermetic container. SOLUTION: A distortion influencing a compression mechanism part 13 is prevented by adsorbing the stress caused by expansion and shrinkage of an outer suction pipe 15 due to flame produced at the time of copper brazing work 21 by providing a groove on the outer suction pipe 15. The same effect can be obtained by applying a groove to a suction pipe 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor for an air conditioner / refrigeration conditioner or the like.

[0002]

2. Description of the Related Art Conventionally, a compressor of this type has a motor-driven mechanism 102 and a compression mechanism 103 housed in a sealed container 101 as shown in FIG. A suction tube 104 for sucking the refrigerant gas is connected to and fixed to the closed container 101 by copper brazing and welding 111, and a suction mechanism 104 and a compression mechanism 103.
A discharge pipe 106 for discharging the refrigerant gas compressed by the above is attached, an evaporator (not shown) is provided on the side where the refrigerant pipe 107 is attached to the suction pipe 104, and a condenser (not shown) is provided on the side attached to the discharge pipe 106 side. Are connected to each other to form a so-called refrigeration cycle. The suction outer pipe 105 and the discharge pipe 106 are made of a copper material, and the suction pipe 104 is made of a steel copper-plated product. A material that can be connected to a copper pipe connected to an evaporator and a condenser by copper brazing welding 111 is selected. I have. In addition, the connection between the outer suction pipe 105 and the discharge pipe 106 to the closed vessel 101 is made by making a hole in the closed vessel 101 because the closed vessel 101 is generally made of a steel plate.
5 and silver brazing welding 110 using a flux is performed.

The configuration around the suction pipe 104 for directly sucking the refrigerant gas into the compression mechanism 103 from the outside of the closed vessel 101 is the same as that of the suction hole 108 provided in the compression mechanism 103. A hole is formed by burring in the portion, and a copper outer suction tube 105 is previously attached to the hole by silver brazing welding 110. Suction hole 108 provided in compression mechanism 103
Is provided with a suction tube insertion hole 109 slightly larger than the suction hole 108. The suction pipe 104 is press-fitted into the suction pipe insertion hole 109 from the outside of the closed vessel 101.
The compression mechanism 103 in the inside 1 has a role of sealing and partitioning the discharged high-pressure gas and the suctioned low-pressure gas near the suction. The opposite end face of the suction pipe 104 is set to have the same length as the end of the suction outer pipe 105 attached to the airtight container 101, or to have such a length as to slightly exit. In addition, a refrigerant pipe 107 is inserted into the suction pipe 104, and a partition is made between the outside atmospheric pressure and the suction low-pressure section of the closed vessel 101 and the high-pressure section inside the closed vessel 101. ,
The three parts of the refrigerant pipe 107 are simultaneously heated by a flame, a filler material is added, and joining is performed by copper brazing welding 111.

[0004]

However, in the above-mentioned conventional structure, the outer suction pipe, the suction pipe, and the refrigerant are arranged around the suction section to partition the outside atmospheric pressure and suction low pressure section of the closed vessel and the high pressure section inside the closed vessel. We are performing copper brazing welding 21 to pipes. At the time of the copper brazing welding 21 operation, the member is generally blown with a flame such as a torch, and the molten material is melted and joined in a state where the member is at a high temperature. When this flame is applied to the member, the temperature of the suction outer tube directly hit by the flame is higher than that of the suction tube not hit by the flame. In addition, since the suction outer pipe is made of copper and the suction pipe is made of steel, the suction outer pipe that is directly exposed to the flame has a larger thermal expansion coefficient than the suction pipe.
The overall length of the suction outer tube is longer than in the cold state.

In this state, when the refrigerant pipe, the suction outer pipe and the suction pipe are simultaneously copper-brazed and welded 21, the suction pipe is fixed to the suction outer pipe whose length has been lengthened by the flame, and the flame is cooled to perform the entire length. The longer outer suction tube shrinks,
The contraction direction is a direction that pushes the entire compression mechanism. That is, the stress at the time of contraction of the outer suction pipe is transmitted through the suction pipe to the suction side of the compression mechanism as a stress, and may cause the entire compression mechanism to be distorted.

Although the compression mechanism is adjusted and assembled while maintaining the clearance between the sliding surfaces of the components, distortion occurs due to the copper brazing and welding 21 as described above. This gap changes before and after the copper brazing welding 21 operation, and the gap on the sliding surface of the component may become narrower or wider. When the gap between the sliding surfaces of the components is reduced, the components may be rubbed with each other, and the abrasion of the sliding portions and the noise and vibration at that time may be increased. Conversely, when the clearance between the sliding surfaces of the components is widened, the compression ratio in the compression mechanism may be reduced, and the capability exceeding the rating may not be exhibited.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a compressor that minimizes distortion exerted on the entire compression mechanism due to expansion and contraction of an outer suction pipe.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention absorbs and regulates stress generated from thermal expansion and contraction due to a flame during welding of copper brazing 21 to a suction outer pipe and a suction pipe. A mechanism is provided. The influence of the distortion exerted on the compression mechanism by the suction outer pipe and the suction pipe can be reduced, and wear, vibration, noise, and reduction in compression ratio of the sliding surface can be prevented.

[0009]

BRIEF SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention provides a closed container, a compression mechanism provided with a compression chamber for compressing a refrigerant by a drive mechanism provided inside the closed container, A suction pipe which is connected to the suction outer pipe attached to the closed container and a compression chamber of the compression mechanism portion and which is provided through the inside of the suction outer pipe to an end of the suction outer pipe; A hermetic compressor composed of a refrigerant pipe inserted and connected inside the suction pipe, wherein the suction outer pipe is provided with one or more concave or convex grooves so that the suction outer pipe and suction A mechanism is provided to absorb and regulate the stress generated from the thermal expansion and contraction caused by the flame at the time of copper brazing welding of the pipe 21, and the entire compression mechanism is not distorted.

Further, the invention of claim 2 is a case where the concave or convex groove provided in the suction outer tube of claim 1 is changed to a concave or convex spiral.
The same operation as that described above can be obtained.

Further, the invention of claim 3 is a case where the concave or convex groove provided on the suction outer tube of claim 1 is changed to a concave or convex annular shape. An equivalent action is obtained.

Further, the invention according to claim 4 is characterized in that the suction pipe has
By providing one or more concave or convex grooves, an operation equivalent to that of claim 1 can be obtained.

Further, the invention of claim 5 is a case where the concave or convex groove provided in the suction pipe of claim 4 is changed to a concave or convex spiral. An equivalent action is obtained.

The invention according to claim 6 is the one in which the concave or convex groove provided in the suction outer tube according to claim 4 is changed to a concave or convex annular shape. An equivalent action is obtained.

Further, according to the present invention, the suction outer pipe is made of a material having a thermal expansion coefficient equal to or less than that of the suction pipe, so that the flame at the time of copper brazing welding 21 of the suction outer pipe and the suction pipe is performed. This suppresses the thermal expansion and contraction of the suction outer pipe due to the above, and can realize the same expansion and contraction as the suction pipe, thereby reducing the distortion applied to the inside of the compressor.

The invention according to claim 8 is characterized in that the suction outer pipe and the suction pipe are made of steel and are plated with copper so that the copper brazing welding 21 can be easily performed. It is possible to suppress the thermal expansion and contraction of the suction outer tube due to the flame at the time of the brazing welding 21, and to realize the same expansion and contraction as the suction tube.

In the ninth aspect of the present invention, the suction outer pipe and the suction pipe are made of a copper material, and the thermal expansion and shrinkage of the suction outer pipe caused by a flame at the time of copper brazing welding 21 of the suction outer pipe and the suction pipe are suppressed. In addition, the same expansion and contraction as the suction pipe can be realized, and the same operation as that of the seventh aspect can be obtained.

Furthermore, the invention of claim 10 is characterized in that at least one convex shape of the inner diameter of the suction outer tube is applied with an enlarged portion of the expansion shape of the suction tube, and a copper brazing welding 21 for the suction outer tube and the suction tube is provided. It is possible to reduce the distortion exerted on the compression mechanism by restricting the movement of the suction pipe by moving the suction pipe which contracts and moves during cooling after the operation by the protrusion of the inner diameter of the suction outer pipe.

The eleventh aspect of the present invention is characterized in that the refrigerant pipe is inserted into the suction pipe, and three ends of the suction outer pipe end, the suction pipe, and the refrigerant pipe are welded to each other.

Hereinafter, the present invention will be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 shows a rolling piston hermetic compressor in a preferred embodiment of a compressor according to the present invention. The closed container 11 includes an upper lid 11a, a body 11b, and a lower lid 11c. They are made by forming a steel plate and hermetically welded.
It is 1. The electric mechanism 1 is provided inside the closed container 11.
2 and the compression mechanism 13 are housed. Further, the inside of the sealed container 11 in this embodiment is a so-called high-pressure closed refrigerant compressor filled with a refrigerant gas compressed by a rolling piston type compression mechanism 13, and discharges the compressed gas into the closed container 11. A pipe 14 is attached to the upper lid 11a, while a suction outer pipe 15 is attached to the body 11b on the suction side for sucking refrigerant gas.

FIG. 2 shows the detailed structure. Inhalation outer tube 15
In advance, a concave groove is formed in the cylindrical portion, and the suction outer tube 15 is formed into a shape in which the entire length thereof contracts. The outer suction pipe 15 is connected to the body 11 b of the closed container 11. The suction outer tube 15 is joined to a position corresponding to a hole previously opened in the body 11b of the closed casing 11 at the same position as the suction hole 16 provided in the compression mechanism 13. The outer suction pipe 15 is generally made of a copper pipe, and is joined by silver brazing welding 20 using a flux because the closed vessel 11 is made of steel. The inlet of the suction hole 16 provided in the compression mechanism 13 is provided with a suction pipe insertion hole 17 which is a hole slightly larger than the suction hole 16. Into the suction pipe insertion hole 17, a suction pipe 18 is inserted from the outside of the closed vessel 11 through the inside of the suction outer pipe 15, pressed into the suction pipe insertion hole 17, and inserted into the closed vessel 11.
Seals the discharge high pressure and suction low pressure inside. The opposite end face of the suction pipe 18 is set to have a length such that it slightly protrudes from the end of the suction outer pipe 15 attached to the body 11 b of the closed container 11. The refrigerant pipe 1 is connected to the suction pipe 18.
9 is inserted and the suction outer pipe 15, the suction pipe 18, the refrigerant pipe 1
By heating 9 and adding a filler material and simultaneously joining by brazing and welding, the outside atmospheric pressure and suction low pressure portion of the sealed container 11 and the high pressure portion inside the sealed container 11 are partitioned.

With this configuration, the temperature 7 for melting the solubilized material by the flame of the torch at the time of copper brazing welding 21 of the suction outer pipe 15 and the suction pipe 18 during the work.
When the member is heated to about 00 ° C., the expansion coefficient of the suction outer pipe 15 is slightly larger than the expansion length of the suction pipe 18 because the expansion coefficient of the suction outer pipe 15 directly hitting the flame is larger than that of the suction pipe 18. Length differences occur. In this state, the copper pipe brazing welding 21 was fixed while simultaneously adding the solubilizing material to the refrigerant pipe 19, the suction outer pipe 15, and the suction pipe 18,
When cooled, the expansion of the suction outer tube 15 and the suction tube 18 generated by the flame shifts to contraction, and the difference in the expansion length at the time of the flame becomes the difference in the contraction length as it is. The contraction direction is a direction that pushes the entire compression mechanism. That is, the difference between the contraction lengths of the outer suction pipe 15 and the suction pipe 18 becomes a stress, and the stress is transmitted through the suction pipe 18 to cause a distortion from the suction side of the compression mechanism 13 to the entire compression mechanism 13. . However, the difference between the contraction lengths when cooling was performed on the cylinder of the suction outer pipe 15 was used as a cushion, so that the difference in contraction length could be absorbed. This allows
Since the stress generated due to the difference in contraction of the suction outer tube 15 is absorbed by the concave groove formed on the cylinder of the suction outer tube 15, the stress is transmitted to the suction side of the compression mechanism 13. And the distortion of the entire compression mechanism 13 is no longer exerted.

The same effect can be obtained even if the groove formed on the cylinder of the suction outer tube 15 is convex, and the same effect can be obtained if the number of grooves is not limited to one and two or more. .
Furthermore, the same effect can be obtained even if the shape of the groove is spiral or annular.

(Embodiment 2) FIG. 3 shows that the suction outer pipe 25 is a straight pipe, a concave groove is previously formed in a cylindrical portion of the suction pipe 28, and the suction pipe 28 has a shape in which the entire length is contracted. It indicates that Note that portions corresponding to FIG. 2 are denoted by the same reference numerals, and redundant description is omitted. Specifically, a suction pipe 28 is inserted into the suction pipe insertion hole 17 from the outside of the closed container 11.
And is press-fitted into the suction pipe insertion hole 17 to seal the discharge high pressure and suction low pressure inside the sealed container 11. The suction pipe 28 is inserted through the inside of the suction outer pipe 25 and is pressed into the suction pipe insertion hole 17 to seal the discharge high pressure and the suction low pressure inside the closed container 11. Suction pipe 28
Of the suction outer tube 25 attached to the body 11b of the sealed container 11 is set to have a length slightly protruding from the end of the suction outer tube 25. The refrigerant pipe 19 is inserted into the suction pipe 28, and the suction outer pipe 25, the suction pipe 28, and the refrigerant pipe 19 are heated, a filler material is added thereto, and the two are simultaneously joined by brazing and welding. The suction low-pressure section and the high-pressure section inside the sealed container 11 are partitioned.

With the above construction, the difference between the contraction lengths when cooling is performed during the copper brazing welding 21 of the suction outer pipe 25 and the suction pipe 28 and the suction pipe 2
Since the concave groove processed on the cylinder No. 8 plays a role of a cushion, the difference in contracted length could be absorbed. As a result, the stress generated due to the difference in contraction of the suction outer tube 25 is absorbed by the concave groove formed on the cylinder of the suction tube 28, and the stress on the suction side of the compression mechanism 13 is increased. And the distortion of the compression mechanism 13 as a whole is no longer exerted.

The same effect can be obtained even if the grooves formed on the cylinder of the suction pipe 28 are convex, and the number of grooves is one.
The same effect can be obtained with not only one but also two or more. Furthermore, the same effect can be obtained even if the shape of the groove is spiral or annular.

(Embodiment 3) FIG. 4 shows that the suction outer pipe 35 is a straight pipe, the suction pipe 38 is a straight pipe on the side inserted into the suction pipe insertion hole 17, and the opposite end is an expanded pipe. This shows that a material having a thermal expansion coefficient of copper is used for the suction pipe 35 and the suction pipe 38. Note that portions corresponding to FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.

With this configuration, the temperature 7 for melting the solubilized material with the flame of the torch at the time of copper brazing welding 21 of the suction outer tube 35 and the suction tube 38 is performed.
The member is heated to about 00 ° C., and since the suction outer tube 35 and the suction tube which are directly exposed to the flame are made of the same material of copper, the thermal expansion coefficients are equal, and the expansion length of the suction outer tube 35 is equal to the expansion length of the suction tube 38. The lengths are almost equal. In this state, the refrigerant pipe 1
9, the brazing pipe 35 and the suction pipe 38 are fixed by welding with a copper braze 21 while simultaneously adding a solubilizer, and when cooled, the expansion of the suction pipe 35 and the suction pipe 38 expanded by the flame shifts to contraction. The expansion length at the time of flame becomes the contraction length as it is. As a result, there is no difference between the contraction lengths of the outer suction pipe 35 and the suction pipe 38, so that the compression mechanism 13
No stress is generated on the suction side of the compression mechanism 13, and the entire compression mechanism 13 is not distorted.

The same can be said for the case where the suction outer tube 35 is made of steel and the suction tube 38 is also made of steel. When a material other than copper is used for the outer suction pipe 35 and the suction pipe 38, it is necessary to apply copper plating to the members in order to perform the copper brazing welding 21 operation.

As described in Embodiments 1 and 2, concave or convex grooves are formed on the cylinders of the suction outer tube 35 and the suction tube 38, and the number of grooves is one.
The same effect can be obtained by processing not only one groove but also two or more grooves, and further, by processing spiral or annular grooves other than concave or convex.

(Embodiment 4) FIG. 5 shows that at least one annular groove having a convex shape is provided on the inner diameter of the suction outer pipe 45, and the suction pipe 48 is connected to the compression chamber communication side, and the opposite side is connected to the suction pipe. Suction pipe 4 having an expanded shape larger than the inner diameter convex portion of pipe 45.
8 shows that the enlarged portion 8 is brought into contact with the suction outer tube convex portion. Note that portions corresponding to FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.

By implementing with such a configuration, the difference in contraction length when cooling is performed after the copper brazing welding 21 operation is reduced to at least one convex shape that projects to the inner diameter of the outer suction tube 45. Since the movement of the suction pipe 48 can be restricted by making contact with the expanded portion of the suction pipe 48, stress is not transmitted to the suction side of the compression mechanism 13, and distortion of the entire compression mechanism 13 is distorted. Has no effect. In the above embodiment, a rolling piston type hermetic compressor has been described as an example. However, it goes without saying that the present invention can be applied to different types of compressors such as a low-pressure reciprocating compressor and a scroll compressor. .

[0034]

As described above, by providing grooves on the cylinder of the suction outer pipe or the suction pipe as described in the first and fourth aspects of the present invention, expansion by flame during copper brazing welding and shrinkage by cooling. Thus, the stress transmitted from the outer suction pipe to the suction pipe and applied to the compression mechanism can be absorbed. Therefore, while the compression mechanism is assembled while maintaining the clearance between the sliding surfaces of the components, the stress generated by performing the copper brazing and welding work as described above is reduced by the suction outer pipe or the outer pipe. Since it is absorbed in the groove of the suction pipe, it can be configured as a finished product without changing the gap of the sliding surface, so that the parts rub, the sliding part wears and the noise, vibration and compression rate at that time are improved. Therefore, the best and best compressor can be provided.

Further, when the suction outer pipe and the suction pipe are made of the same thermal expansion coefficient or a material having a lower thermal expansion coefficient than that of the suction pipe, the working is easy. Therefore, it can be manufactured at low cost, and the same effect as described above can be obtained.

Further, by utilizing the convex protrusion of the inner diameter of the suction outer tube as in the invention of claim 10, the contraction of the suction outer tube at the time of copper brazing welding is received by the shoulder of the suction tube. An equivalent effect can be obtained.

Further, according to the present invention, no special parts are required, and only simple processing is required for the piping, so that the working efficiency at the time of copper brazing and welding is not reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment of the present invention.

FIG. 2 is a detailed longitudinal sectional view of the vicinity of a refrigerant gas intake of the hermetic compressor according to the first embodiment of the present invention.

FIG. 3 is a detailed longitudinal sectional view of the vicinity of a refrigerant gas intake of the hermetic compressor according to the second embodiment of the present invention.

FIG. 4 is a detailed vertical sectional view of the vicinity of a refrigerant gas intake of a hermetic compressor according to a third embodiment of the present invention.

FIG. 5 is a detailed vertical cross-sectional view of a hermetic compressor according to a fourth embodiment of the present invention in the vicinity of refrigerant gas suction;

FIG. 6 is a longitudinal sectional view of a conventional hermetic compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Closed container 11a Upper lid part 11b Trunk part 11c Lower lid part 12 Electric mechanism part 13 Compression mechanism part 14 Discharge pipe 15 Slotted suction outer pipe 16 Suction hole 17 Suction pipe insertion part 18 Suction pipe 19 Refrigerant pipe 20 Silver brazing welding 21 Copper brazing welding 25 Suction outer tube 28 Suction tube with groove 35 Suction outer tube (copper material) 38 Suction tube (copper material) 45 Suction tube with groove 48 Suction tube

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Hiroyuki Fukuhara 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 3H003 AA05 AB04 AC03 CD07 3H029 AA04 AA13 AB03 BB31 CC24 CC38

Claims (11)

[Claims] 1. A closed container, a drive mechanism inside the closed container, and a compression mechanism section having a compression chamber for compressing the refrigerant by the drive mechanism are housed, and refrigerant is supplied to the compression chamber from outside the closed container. A suction pipe connected to the closed container with the suctioned refrigerant passage in a sealed manner, and a suction pipe communicating with a compression chamber of the compression mechanism and penetrating through the inside of the suction outer pipe, near an end of the suction outer pipe; A sealed electric compressor characterized in that the suction outer pipe is provided with one or more concave or convex grooves. 2. The hermetic electric compressor according to claim 1, wherein the suction outer tube is provided with a concave or convex spiral groove extending over 360 °. 3. The hermetic electric compressor according to claim 1, wherein the suction outer tube is provided with a concave or convex annular groove. 4. A closed container, a drive mechanism inside the closed container, and a compression mechanism section having a compression chamber for compressing the refrigerant by the drive mechanism are housed, and the refrigerant is supplied to the compression chamber from outside the closed container. A suction pipe connected to the closed container with the suctioned refrigerant passage in a sealed manner, and a suction pipe communicating with a compression chamber of the compression mechanism and penetrating through the inside of the suction outer pipe, near an end of the suction outer pipe; A hermetic electric compressor, characterized in that the suction pipe is provided with one or more concave or convex grooves. 5. The hermetic electric compressor according to claim 4, wherein the suction pipe is provided with a concave or convex spiral groove extending over 360 °. 6. The hermetic electric compressor according to claim 4, wherein the suction pipe is provided with a concave or convex annular groove. 7. The hermetic electric compressor according to claim 1, wherein the suction outer pipe is made of a material having a thermal expansion coefficient equal to or less than that of the suction pipe. 8. The hermetic electric compressor according to claim 7, wherein the outer suction pipe and the suction pipe are made of steel and plated with copper. 9. The hermetic electric compressor according to claim 7, wherein the suction outer pipe and the suction pipe are made of copper. 10. A closed container, a drive mechanism inside the closed container, and a compression mechanism section having a compression chamber for compressing the refrigerant by the drive mechanism are housed, and refrigerant is supplied to the compression chamber from outside the closed container. A suction pipe connected to the closed container with the suctioned refrigerant passage in a sealed manner, and a suction pipe communicating with a compression chamber of the compression mechanism and penetrating through the inside of the suction outer pipe, near an end of the suction outer pipe; At least one annular groove having a convex shape is provided on the inner diameter of the suction outer pipe, and the suction pipe is connected to the compression chamber communication side, and the opposite side is formed with the inner diameter protrusion of the suction outer pipe. 2. The hermetic electric compressor according to claim 1, wherein an enlarged portion of the suction pipe, which is enlarged to a size larger than that of the suction pipe, abuts on the projection of the suction outer pipe. 11. A sealed electric motor according to claim 1, wherein a refrigerant pipe is inserted into the suction pipe, and three ends of the suction outer pipe end, the suction pipe, and the refrigerant pipe are welded to each other. Compressor.