JP3172242B2 - Rotary compressor manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rotary compressor in which a cylinder of a rotary compression element is attached to a closed vessel by welding.

[0002]

2. Description of the Related Art In a conventional general rotary compressor, a cylinder is mounted on the inner wall of a closed vessel, and this cylinder is fixed by spot welding from the outside of the closed vessel (Japanese Utility Model Publication No. 51-2).
No. 326).

[0003]

However, in the conventional rotary compressor, spot welding is performed one by one in order.
Alternatively, a method of performing spot welding simultaneously has been adopted. Therefore, in the method performed one by one in order, the pushing force acts on the cylinder each time welding is performed, and when the welding positions cannot be arranged evenly by the simultaneous method, the resultant force of the pushing force due to the thermal stress of welding is balanced. Or the cylinder moves or falls down in the closed container, the center of the cylinder is displaced, and the gap between the stator and the rotor of the electric element is varied, and the rotation is caused by the suction of the stator. There was a problem that the child hit the stator.

The present invention solves the above problem,
It is an object of the present invention to provide a method for manufacturing a rotary compressor in which movement and fall of a cylinder due to a pushing force during spot welding are prevented.

[0005]

SUMMARY OF THE INVENTION The present invention provides a closed container,
An electric element housed on the upper side of the container, a rotary compression element housed on the lower side, and a rotary shaft for transmitting the rotational force of the electric element to the rotary compression element,
A cylinder block having a cylindrical cylinder and a support arm extending radially on opposite sides of the cylinder and contacting the inner wall of the closed container; and a roller rotated by an eccentric portion of a rotating shaft along the inner wall of the cylinder. A vane that contacts the roller and partitions the inside of the cylinder into a high-pressure chamber and a low-pressure chamber, and a frame that seals the opening of the cylinder. The spot welding is fixed to this closed container, and the spot welding is applied to one of the support arms at one place,
Two places are provided on the other support arm on the opposite side, the start of the welding of the one place is earlier than the start of the welding of the two places, and the welding of the two places is performed simultaneously.

[0006]

According to the present invention having the above-described structure,
First, the vertices of the spot welds formed into a substantially isosceles triangular shape are welded first, then the start is shifted and the remaining two are welded.
At the same time, the welding is performed at two points, and the pushing force acting on the cylinder by each welding is canceled to prevent the cylinder from moving or falling.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings.

FIG. 1 is a sectional view of a rotary compressor showing one embodiment of the present invention. FIG. 2 is a plan view showing a state where the closed vessel and the cylinder are spot-welded.

Reference numeral 1 denotes a closed container, in which an electric element 2 is accommodated on the upper side, and a rotary compression element 3 driven by the electric element is accommodated on the lower side. The electric element 2 includes a stator 4, a rotor 5 arranged inside the stator, and a rotating shaft 6 inserted and mounted at the center of the rotor.

The rotary compression element 3 includes a cylinder block 10 having a cylindrical cylinder 7 and support arms 8, 9 extending radially on opposite sides of the cylinder and attached to the inner wall of the closed casing 1. The roller 12 is rotated along the inner wall of the cylinder 7 by the eccentric portion 11, and the roller 12 slides in a sliding groove 13 formed in one of the support arms 9.
A vane 16 which partitions the inside of the cylinder 7 into a high-pressure chamber 14 and a low-pressure chamber 15 in contact with the upper frame 17 and a lower frame 18 which seal the opening of the cylinder 7; And a cup body 20 formed with the same. The upper frame 17 is provided with a discharge port 21 that communicates between the inside of the cylinder 7 and the inside of the cup body 20. This discharge port is opened and closed by a discharge valve 22. The cup body 20 is provided with a discharge port 23 that opens into the closed container 1.

Reference numerals 24, 25, and 26 denote spot welds for fixing the support arms 8, 9 of the cylinder 7 to the inner wall of the closed casing 1. One spot weld is provided on one support arm 8 and the other support arm 9 is provided. And is formed in a substantially isosceles triangular shape.

First, one spot welding is applied to the support arm 8 and then two spots are simultaneously applied to the support arm 9. That is, spot welding starts the next welding while performing the first welding. The spot welding time is about 1 second each, and the time from the start of the first welding to the start of the next welding is 0.3 to 0.6 seconds.

Reference numeral 27 denotes a suction pipe communicating with the inside of the cylinder 7.
An accumulator 28 is attached to this suction pipe by welding. Reference numeral 29 denotes a discharge pipe attached to the upper wall of the closed container 1.

In the manufacturing method of the rotary compressor having the above-described structure, the assembling sequence will be described. First, the cylinder block 10 is fixed to the inner wall of the closed casing 1 by shrink fitting. Then, the support arms 8 and 9 of the cylinder block 10 are spot-welded from the outside of the closed container 1 and fixed to the closed container. That is, the cylinder block 10 is
9 is fixed to the closed casing 1 by spot welds 24, 25, 26 formed in a substantially isosceles triangular shape. In this spot welding, the first welding at the top is applied to the support arm 8 at one location, and two spot weldings are simultaneously applied to the opposite support arm 9 before the end of the spot welding.

The spot welds 24, 25, and 26 are formed by first performing one spot welding with a small thermal stress.
By increasing the rigidity of the first spot weld 24 in advance,
The resultant force due to the thermal stress of the spot welding performed simultaneously at two places is canceled to prevent the cylinder block 10 from being distorted by the thermal stress due to the welding. As a result, the cylinder blocks 10 are spot-welded 24, 25, 26
Even if they are not evenly arranged so that thermal stresses are balanced, they can be prevented from moving or falling by spot welding.

The rotary compressing element 3 balances the supporting arms 8 and 9 of the cylinder block 10 by spot welding and fixes the supporting arms 8 and 9 to the inner wall of the closed vessel 1 so that the center of the cylinder 7 is displaced or the cylinder 7 falls. And the stator 4 and the rotor 5 with the rotating shaft 6 transmitting the torque of the electric element 2
The gap between the rotor and the rotor is kept constant so that the rotor can be prevented from hitting the stator and generating noise due to the suction effect during operation.

The spot weld 24 at the top is ± 15.
Even if the welding point is moved within the range of
It is configured to be able to cancel the thermal stress at the time of welding of Nos. 5 and 26.

Further, the cylinder block 10 is prevented from being affected by the thermal stress due to welding when the accumulator 28 is mounted by suppressing the center displacement and falling due to spot welding.

[0019]

As described above, according to the present invention, the closed container, the electric element accommodated in the upper part of the container, the rotary compression element accommodated in the lower part, and the rotational force of the electric element are reduced. A rotary shaft for transmitting to the rotary compression element, a cylinder block having a cylindrical cylinder and a support arm extending radially on opposite sides of the cylinder and in contact with the inner wall of the sealed container, A roller rotating along an inner wall of the cylinder by an eccentric portion of a rotating shaft, a vane in contact with the roller to partition the inside of the cylinder into a high-pressure chamber and a low-pressure chamber, and a frame body closing an opening of the cylinder. Then, the supporting arm of the cylinder of the rotary compression element is fixed by spot welding from the outside of the closed vessel, and the spot welding is performed at one position on one of the supporting arms and 2 on the other supporting arm on the opposite side. Ke Provided, the start of the welding of the one place,
Since the welding at the two locations is performed earlier than the start of the welding at the two locations and the welding at the two locations is performed at the same time, even if the spot welds cannot be evenly arranged on the cylinder block, the thermal stress due to the spot welding is balanced. Thus, it is possible to prevent the center of the cylinder from being displaced or falling down, and to prevent the stator and the rotor of the electric element from hitting each other during operation to generate noise.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rotary compressor showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the rotary compression element of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric element 3 Rotary compression element 6 Rotating shaft 7 Cylinder 8, 9 Support arm 11 Eccentric part 12 Roller 13 Sliding groove 16 Vane 17 Upper frame body 18 Lower frame body 24, 25, 26 Spot welding part

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hitomi Takagi 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-60-101290 (JP, A) 2-135688 (JP, U) JP-A-58-156190 (JP, U) JP-A-51-2326 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 29/00 B23K 11/00 510 B23K 11/11 540

Claims (1)

(57) [Claims] 1. An airtight container, comprising: a motorized element housed in an upper part of the container; a rotary compression element housed in a lower part; and a rotary shaft for transmitting a torque of the motorized element to the rotary compression element. A cylinder block having a cylindrical cylinder and a support arm extending radially on opposite sides of the cylinder and in contact with the inner wall of the closed container; and an eccentricity of a rotating shaft along the inner wall of the cylinder. A roller rotating by a portion, a vane in contact with the roller to partition the inside of the cylinder into a high-pressure chamber and a low-pressure chamber, and a frame closing an opening of the cylinder, wherein the rotary compression element includes a support arm of the cylinder. Is spot-welded from the outside of the closed container to the rotary compressor fixed to the closed container, and the spot welding is performed at one place on one of the support arms and two on the other support arm on the opposite side. A method for manufacturing a rotary compressor, wherein the start of welding at one location is earlier than the start of welding at two locations, and the welding at two locations is performed simultaneously.