JP5237029B2 - Rotary compressor - Google Patents

Description

  The present invention relates to a method for assembling a rotary compressor used in a refrigeration apparatus.

A rotary compressor used in a refrigeration apparatus includes a cylinder having a cylindrical inner wall surface and a piston rotor provided eccentrically with respect to the center of the cylinder in a sealed container.
Then, the refrigerant is supplied from the suction port to the compression chamber formed between the cylinder and the piston rotor, the volume of the compression chamber is reduced by the rotation of the piston rotor, and the refrigerant is compressed and discharged from the discharge port.

  Among such compressors, there is a multi-cylinder type that includes a plurality of sets of cylinders and piston rotors. In a multi-cylinder type compressor, a plurality of sets of cylinders and piston rotors are arranged in a container along the axial direction of the container, and each set of piston rotors is fixed to a single shaft. .

By the way, when assembling a multi-cylinder type compressor, as shown in FIG. 6, the shaft 1 having a plurality of piston rotors (not shown) spaced apart in the axial direction and the outer peripheral side of each piston rotor. A plurality of opposed cylinders 2 and bearings 3 and 3 for instructing the plurality of cylinders 2 to rotate the shaft 1 are integrated in advance as a unit 5, and the unit 5 is set in a container 6.
At this time, the container 6 is set on the base jig 7, and the unit 5 is held by the cylinder holding jig 8 positioned in the container 6.
In this state, the tip of the pipe 9 for feeding the refrigerant into the cylinder 2 is press-fitted into the cylinder 2 from the opening 6a formed in the container 6, and then the cylinder 2 is fixed to the container 6 integrally by welding or the like. (For example, refer to Patent Document 1).

JP 2006-37757 A (FIG. 6)

However, according to the conventional method as described above, when the pipe 9 is press-fitted into the cylinder 2, the unit 5 has the lower cylinder 2B positioned and fixed to the cylinder holding jig 8 by the pin 8a or the like. Yes.
In this state, when the pipe 9 is press-fitted into the upper cylinder 2 </ b> A, the pressure input is received by the lower cylinder 2 </ b> B fixed to the cylinder holding jig 8. The upper-stage cylinder 2A and the lower-stage cylinder 2B constituting the unit 5 are integrally connected with a bolt or the like (not shown). When the pressure input of the pipe 9 to the upper cylinder 2A exceeds the fastening force of a bolt or the like connecting the upper cylinder 2A and the lower cylinder 2B, the pressure of the pipe 9 to the upper cylinder 2A The upper cylinder 2A and the lower cylinder 2B are orthogonal to the axial direction of the shaft 1 due to the input and the reverse force that the lower cylinder 2B receives from the cylinder holding jig 8 through the pin 8a. There may be a relative displacement in the direction. When the upper cylinder 2A and the lower cylinder 2B are displaced, the upper cylinder 2A and the lower cylinder 2B that are misaligned from the original position interfere with the piston rotor (not shown) and operate. Occasionally, there are problems such as abnormal noise being generated and the rotation of the piston rotor being locked.

  In the technique described in Patent Document 1, the pipe 9 inserted into the lower cylinder 2B is devised to reduce the outer diameter of the pipe 9 at a certain distance from the tip. This is to suppress variations in load, and the problem is different from the above.

  The present invention has been made based on such a technical problem, and an object of the present invention is to provide a method for assembling a rotary compressor that does not cause cylinder misalignment when a pipe is press-fitted.

The present invention made for this purpose includes a plurality of sets of cylinders to which refrigerant is supplied, and an outer diameter smaller than the inner diameter of the cylinder, which is driven to rotate eccentrically with respect to the center of the cylinder in each cylinder. And a piston rotor having a first step of inserting and arranging a plurality of cylinders and piston rotors in the case, and a lower-stage cylinder. With the first fixing means positioned and fixed, the second step of press-fitting a pipe for supplying refrigerant into the cylinder into the lower cylinder and the lower cylinder positioning and fixing by the first fixing means A third step of releasing and fixing the upper cylinder by the second fixing means, and a fourth step of press-fitting a pipe into the upper cylinder;
It is characterized by providing.
Thus, in the second step of press-fitting the pipe into the lower cylinder, the lower cylinder is positioned and fixed by the first fixing means, so the upper cylinder and the lower cylinder are relatively fixed. It is possible to avoid the occurrence of misalignment. Further, in the fourth step of press-fitting the pipe into the upper cylinder, the upper cylinder is fixed by the second fixing means, so the upper cylinder and the lower cylinder have a relative core. Deviations can be avoided.

  Here, a jig or the like can be used as the first fixing means for positioning and fixing the lower cylinder.

  As a second fixing means for fixing the upper cylinder, the case and the upper cylinder can be welded to fix the upper cylinder, and the case can be held by a case holding jig. Accordingly, the upper cylinder is fixed by the case holding jig through the case.

  A jig can also be used as the second fixing means for fixing the upper cylinder.

  According to the present invention, it is possible to avoid the misalignment between the upper cylinder and the lower cylinder. Thereby, it is possible to reliably avoid problems such as the occurrence of noise during operation due to interference between the cylinder and the piston rotor, or the rotation of the piston rotor being locked.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
[First embodiment]
FIG. 1 is a diagram showing a configuration of a rotary compressor 10 in the present embodiment.
As shown in FIG. 1, the compressor 10 has disk-like cylinders 20A and 20B provided in two upper and lower stages in a cylindrical sealed case 11 having a central axis in the vertical direction in FIG. The so-called two-cylinder type. Cylindrical cylinder inner wall surfaces 20S each having an axial line in the vertical direction are formed at the central portions of the cylinders 20A and 20B.

Piston rotors 21A and 21B having an outer diameter smaller than the inner diameter of the cylinder inner wall surface 20S are arranged inside the cylinders 20A and 20B. Each of the piston rotors 21 </ b> A and 21 </ b> B is inserted and fixed to an eccentric portion of the shaft 23 along the central axis of the case 11. Thus, spaces R each having a crescent-shaped cross section are formed between the cylinder inner wall surfaces 20S of the cylinders 20A and 20B and the outer peripheral surfaces of the piston rotors 21A and 21B.
Here, the upper-stage piston rotor 21 </ b> A and the lower-stage piston rotor 21 </ b> B are provided so that their phases are different from each other.
A disk-shaped partition plate 24 is provided between the upper and lower cylinders 20A and 20B. The partition plate 24 partitions the space R in the upper cylinder 20A and the space R in the lower cylinder 20B into the compression chamber R1 and the compression chamber R2 without communicating with each other.

  As shown in FIG. 2, the upper and lower cylinders 20A and 20B are provided with blades 25 that divide the compression chambers R1 and R2 into two, respectively. In each of the cylinders 20A and 20B, the blade 25 is held in an insertion groove 26 formed to extend in the radial direction of the cylinders 20A and 20B so as to be able to advance and retract in a direction approaching and separating from the piston rotors 21A and 21B. Has been. The rear end portion 25a of the blade 25 is pressed by the coil spring 28, and the front end portion 25b is always pressed against the piston rotors 21A and 21B.

  As shown in FIG. 1, the shaft 23 is supported by upper and lower bearings 29A and 29B fixed to upper and lower cylinders 20A and 20B by bolts 29 so as to be rotatable around the axis. Thus, when the shaft 23 rotates, the upper and lower piston rotors 21A and 21B roll eccentrically in the cylinders 20A and 20B. At this time, since the blade 25 is pressed by the coil spring 28, the tip portion 25b advances and retreats following the movement of the piston rotors 21A and 21B, and is always pressed against the piston rotors 21A and 21B.

  The shaft 23 protrudes upward from the bearing 29 </ b> A, and a motor rotor 37 of a motor 36 for rotating the shaft 23 is integrally provided at the protruding portion. A motor stator 38 is fixed to the inner peripheral surface of the case 11 so as to face the outer peripheral portion of the motor rotor 37.

  Openings 12A and 12B are formed on the sides of the case 11 at positions facing the outer peripheral surfaces of the cylinders 20A and 20B. Cylindrical sleeves 13A and 13B are inserted into the openings 12A and 12B and fixed by brazing. The other ends of the sleeves 13 </ b> A and 13 </ b> B protrude outside the case 11. The cylinders 20A and 20B are formed with suction ports 30A and 30B that communicate with the openings 12A and 12B up to a predetermined position on the cylinder inner wall surface 20S. Then, the distal ends of cylindrical pipes 17A and 17B are inserted into the suction ports 30A and 30B through the sleeves 13A and 13B. The rear ends of the pipes 17A and 17B are located at substantially the same position as the other ends of the sleeves 13A and 13B protruding to the outside of the case 11.

An accumulator 14 for gas-liquid separation of the refrigerant prior to supply to the compressor 10 is fixed to the case 11 via a stay 15 outside the case 11.
The accumulator 14 is provided with suction pipes 16A and 16B for letting the compressor 10 suck the refrigerant in the accumulator 14. The distal ends of the suction pipes 16A and 16B are inserted into the pipes 17A and 17B. The entire circumferences of the leading ends of the suction pipes 16A and 16B, the rear ends of the pipes 17A and 17B, and the other ends of the sleeves 13A and 13B are fixed by brazing.

In such a compressor 10, the refrigerant is taken into the accumulator 14 from the suction port 14 a of the accumulator 14, the refrigerant is separated into gas and liquid in the accumulator 14, and the gas phase is drawn from the suction pipes 16 </ b> A and 16 </ b> B to the pipe 17 </ b> A, 17B and the suction ports 30A and 30B of the cylinders 20A and 20B are supplied to the compression chambers R1 and R2 which are the internal spaces of the inner wall surfaces 20S of the cylinders 20A and 20B.
Then, due to the eccentric rolling of the piston rotors 21A and 21B, the volumes of the compression chambers R1 and R2 are gradually reduced and the refrigerant is compressed. Discharge holes (not shown) for discharging the refrigerant are formed at predetermined positions of the cylinders 20A and 20B, and reed valves (not shown) are provided in the discharge holes. Thereby, when the pressure of the compressed refrigerant increases, the reed valve is pushed open, and the refrigerant is discharged to the outside of the cylinders 20A and 20B. The discharged refrigerant passes through upper and lower muffler chambers 41 and is discharged to an external pipe (not shown) from a discharge port 42 provided in the upper part of the case 11.

Next, a method for assembling the compressor 10 as described above will be described.
As shown in FIG. 3A, the case 11 is set on the base jig 70 with the upper and lower sealing lids not attached. Here, the base jig 70 is integrally provided with a cylinder holding jig 71 for positioning and fixing the lower cylinder 20 </ b> B inside the case 11.
On the other hand, the shaft 23 in which the piston rotors 21A and 21B are integrated, the cylinders 20A and 20B, the partition plate 24, and the bearings 29A and 29B are assembled in advance to form a unit 80.
Then, the unit 80 is set inside the case 11. At this time, the pin 72 provided in the cylinder holding jig 71 is inserted into a pin hole (not shown) formed in the lower cylinder 20B constituting the unit 80, whereby the lower cylinder 20B, that is, the unit 80 is mounted. Position and fix to the cylinder holding jig 71.

  In the lower cylinder 20B, the pipe 17B is press-fitted into the suction port 30B of the cylinder 20B through a sleeve 13B that is brazed and fixed to the case 11 in advance. At this time, since the lower cylinder 20B is positioned and fixed to the cylinder holding jig 71 by the pin 72, the force when the pipe 17B is press-fitted can be directly received by the lower cylinder 20B. There is no relative misalignment between the cylinder 20A and the lower cylinder 20B.

  Next, spot welding is performed from the outside of the case 11 at the welding position W2, and the case 11 and the upper cylinder 20A are welded. As a result, the upper cylinder 20A is fixed to the case 11.

Thereafter, the integrated case 11 and the upper cylinder 20 </ b> A (unit 80) are released from the cylinder holding jig 71. Subsequently, as shown in FIG. 3B, the case 11 is held by a case holding jig 73 that positions and fixes the case 11 itself.
In this state, in the upper cylinder 20A, the pipe 17A is press-fitted into the suction port 30A of the cylinder 20A through the sleeve 13A that is brazed and fixed to the case 11 in advance. At this time, the upper cylinder 20A is already fixed to the case 11 by welding, and the case 11 is held by the case holding jig 73. Therefore, the force when the pipe 17A is press-fitted is as it is. It can be received by the cylinder 20A and the case 11, and it is possible to avoid a relative misalignment between the upper cylinder 20A and the lower cylinder 20B.

  Thereafter, as shown in FIG. 1, other components arranged in the case 11, such as the motor rotor 37 and the motor stator 38 of the motor 36, are assembled, and hermetic lids are attached to the upper and lower sides of the case 11. , The compressor 10 is completed.

According to the compressor 10 as described above, when the lower cylinder 20B is positioned and fixed to the cylinder holding jig 71, the pipe 17B is press-fitted into the lower cylinder 20B to press-fit the pipe 17B. The force is received as it is by the lower cylinder 20B.
Thereafter, the positioning and fixing of the lower cylinder 20B by the cylinder holding jig 71 is released, the case 11 and the upper cylinder 20A are welded to fix the upper cylinder 20A, and the case 11 is fixed to the case holding jig. The pipe 17A is press-fitted into the upper cylinder 20A while being held at 73, so that the force when the pipe 17A is press-fitted is directly received by the upper cylinder 20A.
As a result, it is possible to avoid a relative misalignment between the upper cylinder 20A and the lower cylinder 20B, and the cylinders 20A and 20B and the piston rotors 21A and 21B interfere with each other to generate abnormal noise during operation. Generation | occurrence | production or malfunctions, such as the rotation of piston rotor 21A, 21B locking, can be avoided reliably.

[Second Embodiment]
Next, the assembly method of the compressor 10 in 2nd embodiment concerning this invention is demonstrated. In the following description, configurations different from those of the first embodiment will be described, and the same reference numerals are given to configurations common to the first embodiment, and description thereof will be omitted.
First, the press-fitting process of the pipe 17B into the lower cylinder 20B is performed in the same manner as in the first embodiment.
That is, as shown in FIG. 4A, the case 11 is set on the base jig 70 with the upper and lower sealing lids not attached. Here, the base jig 70 is integrally provided with a cylinder holding jig 71 for positioning and fixing the lower cylinder 20 </ b> B inside the case 11.
On the other hand, the shaft 23 in which the piston rotors 21A and 21B are integrated, the cylinders 20A and 20B, the partition plate 24, and the bearings 29A and 29B are assembled in advance to form a unit 80.
Then, the unit 80 is set inside the case 11. At this time, the pin 72 provided in the cylinder holding jig 71 is inserted into a pin hole (not shown) formed in the lower cylinder 20B constituting the unit 80, whereby the lower cylinder 20B, that is, the unit 80 is mounted. Position and fix to the cylinder holding jig 71.

  In the lower cylinder 20B, the pipe 17B is press-fitted into the suction port 30B of the cylinder 20B through a sleeve 13B that is brazed and fixed to the case 11 in advance. At this time, since the lower cylinder 20B is positioned and fixed to the cylinder holding jig 71 by the pin 72, the force when the pipe 17B is press-fitted can be directly received by the lower cylinder 20B. There is no relative misalignment between the cylinder 20A and the lower cylinder 20B.

Next, the pipe 17A is press-fitted into the upper cylinder 20A as follows.
That is, first, the positioning and fixing of the lower cylinder 20B by the cylinder holding jig 71 is released. Thereafter, as shown in FIG. 4B, the case 11 and the unit 80 are set on the base jig 70. Here, the base jig 70 is integrally provided with a cylinder holding jig 74 inside the case 11 for positioning and fixing the upper cylinder 20A. The cylinder holding jig 74 includes an extending portion 74a extending upward, and a pin 75 protruding upward is formed at the upper end portion of the extending portion 74a. Then, a pin 75 provided on the cylinder holding jig 74 is inserted into a pin hole (not shown) formed on the lower surface of the upper cylinder 20A, whereby the upper cylinder 20A, that is, the unit 80 is connected to the cylinder holding jig. Position and fix to 74.
Since the upper cylinder 20A is positioned and fixed by the cylinder holding jig 74 in this way, the outer periphery of the lower cylinder 20B is interfered with the extension 74a of the cylinder holding jig 74 as shown in FIG. In order to prevent this, a concave 76 is formed on the inner peripheral side. If the upper cylinder 20A can be positioned and fixed without interfering with the lower cylinder 20B, there is no intention to limit the arrangement and shape of the extending portion 74a and the relief 76 of the cylinder holding jig 74. .

  In this state, in the upper cylinder 20A, the pipe 17A is press-fitted into the suction port 30A of the cylinder 20A through the sleeve 13A that is brazed and fixed to the case 11 in advance. At this time, the upper cylinder 20A is positioned and fixed to the cylinder holding jig 74 by the pin 75, and the positioning and fixing of the lower cylinder 20B by the cylinder holding jig 71 is released. The force for press-fitting can be received only by the upper cylinder 20A, and no relative misalignment occurs between the upper cylinder 20A and the lower cylinder 20B.

  After this, the case 11 is welded to the upper cylinder 20A or the lower cylinder 20B. When welding the case 11 and the lower cylinder 20B, the welding may be performed immediately after the pipe 17B is press-fitted into the lower cylinder 20B, or the pipe 17A is press-fitted into the upper cylinder 20A. Later. Further, as shown in FIG. 1, other parts arranged in the case 11 such as the motor rotor 37 and the motor stator 38 of the motor 36 are assembled, and a sealing lid is attached to the top and bottom of the case 11, and the accumulator 14 is attached. Thus, the compressor 10 is completed.

According to the compressor 10 as described above, when the lower cylinder 20B is positioned and fixed to the cylinder holding jig 71, the pipe 17B is press-fitted into the lower cylinder 20B to press-fit the pipe 17B. The force is received as it is by the lower cylinder 20B.
Thereafter, the positioning and fixing of the lower cylinder 20B by the cylinder holding jig 71 is released, and the pipe 17A is press-fitted into the upper cylinder 20A while the upper cylinder 20A is positioned and fixed by the cylinder holding jig 74. Thus, the force for press-fitting the pipe 17A is received only by the upper cylinder 20A.
As a result, it is possible to avoid a relative misalignment between the upper cylinder 20A and the lower cylinder 20B, and the cylinders 20A and 20B and the piston rotors 21A and 21B interfere with each other to generate abnormal noise during operation. Generation | occurrence | production or malfunctions, such as the rotation of piston rotor 21A, 21B locking, can be avoided reliably.

In the above-described embodiment, the configuration of the compressor 10 has been described. However, the configuration of each unit can be appropriately changed within a range that does not depart from the gist of the present invention.
In the above description, the two-cylinder compressor 10 including the two sets of cylinders 20A and 20B and the piston rotors 21A and 21B is taken as an example. However, the present invention can also be applied to a compressor having three or more cylinders.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

It is sectional drawing which shows the structure of the rotary compressor in this Embodiment. It is a figure which shows the cylinder and piston rotor of a compressor, and is sectional drawing in the surface orthogonal to the axis line of a compressor. It is a figure which shows the assembly process of the compressor in 1st embodiment, (a) is a figure which shows the process of positioning and fixing a lower stage side cylinder, and press-fitting a pipe, (b) is an upper stage side cylinder as a case It is a figure which shows the process of welding and fixing and press-fitting a pipe. It is a figure which shows the assembly process of the compressor in 2nd embodiment, (a) is a figure which shows the process of positioning and fixing a lower cylinder with a jig, and press-fitting a pipe, (b) is a cylinder holding jig. FIG. 7 is a diagram showing a process of positioning and fixing an upper cylinder with a jig and press-fitting a pipe after releasing positioning and fixing of a lower cylinder 20B by 71; It is a figure which shows the state which planarly viewed the cylinder in the state of FIG.4 (b). It is a figure which shows the assembly process of the conventional compressor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Compressor, 11 ... Case, 14 ... Accumulator, 16A, 16B ... Suction pipe, 17A, 17B ... Pipe, 20A, 20B ... Cylinder, 71, 74 ... Cylinder holding jig, 72, 75 ... Pin, 73 ... Case Holding jig, 80 ... unit

Claims (3)

A plurality of cylinders to which refrigerant is supplied; and
An assembly method for a rotary compressor in which a piston rotor having an outer diameter smaller than the inner diameter of the cylinder is driven to rotate eccentrically with respect to the center of the cylinder in each of the cylinders. There,
A first step of inserting and arranging a plurality of sets of the cylinder and the piston rotor in the case;
A second step of press-fitting a pipe for supplying a refrigerant into the cylinder in the lower-stage cylinder, with the lower-stage cylinder positioned and fixed by a first fixing means;
A third step of releasing the positioning and fixing of the lower-stage cylinder by the first fixing means and fixing the upper-stage cylinder by the second fixing means;
A fourth step of press-fitting the pipe into the cylinder on the upper stage side;
A method of assembling a rotary compressor, comprising:   In the third step, as the second fixing means, the case and the upper cylinder are welded to fix the upper cylinder, and the case is held by a case holding jig. 2. The method for assembling a rotary compressor according to claim 1.   The method of assembling a rotary compressor according to claim 1, wherein, in the third step, the upper cylinder is positioned and fixed by a jig as the second fixing means.

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