JP2010048241A - Hermetic compressor and refrigerating cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor and a refrigerating cycle device having this hermetic compressor, capable of holding reliability by dispensing with readjustment work, by holding a pre-carrying state without being affected thereby, even if vibration caused by carrying is applied to connected pipes. <P>SOLUTION: This hermetic compressor R stores an electric motor part 3, a first compression mechanism part 2A and a second compression mechanism part 2B in a sealed case 1. An accumulator 20 is installed on and fixed to an outside surface of the sealed case. A pressure switching mechanism K for switching the connection to a cylinder chamber to the low pressure side or the high pressure side, is arranged in a communicating passage 28 for communicating the accumulator 20 with a cylinder chamber 9b of the second compression mechanism part. The pressure switching mechanism has a three-way switching valve 23, a first communicating tube 22 for communicating the three-way switching valve with the accumulator, and a second communicating tube 25 for communicating the three-way switching valve with the second compression mechanism part. The second communicating tube is installed in and fixed to the accumulator by welding or brazing, and the accumulator for installing and fixing the second communicating tube is installed on and fixed to an outside surface of the sealed case. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hermetic compressor in which an accumulator is attached and fixed to an outer surface of a hermetic case, and a refrigeration cycle apparatus that includes this hermetic compressor and constitutes a refrigeration cycle.

  For example, in a refrigeration cycle apparatus such as an air conditioner, a two-cylinder type hermetic housing an electric motor unit and a first compression mechanism unit and a second compression mechanism unit coupled to the electric motor unit in a hermetic case. A type compressor is frequently used.

  In this type of hermetic compressor, the low-pressure evaporative refrigerant led out of the evaporator is gas-liquid separated on the outer surface of the hermetic case, and only the gas refrigerant is supplied to the first and second compression mechanisms. An accumulator is guided and fixed to each cylinder chamber. Therefore, the hermetic compressor and the accumulator are integrated into a unit.

  [Patent Document 1] discloses an invention in which, in the above-described hermetic compressor, a pressure switching mechanism is provided in a pipe communicating the accumulator and the cylinder chamber of the second compression mechanism. The switching means used here is two on-off valves or three-way switching valves, and switches the connection of the second compression mechanism section to the cylinder chamber to the low pressure side or the high pressure side of the refrigeration cycle.

  When switched to the low-pressure side, the low-pressure refrigerant is introduced from the accumulator into the cylinder chamber of the second compression mechanism unit, and the normal compression operation is performed in the second compression mechanism unit. When switched to the high pressure side, the high pressure refrigerant is directly introduced into the cylinder chamber. The cylinder chamber has the same high-pressure atmosphere as that in the sealed case, and the second compression mechanism portion performs non-compression operation in which compression is stopped.

Furthermore, in [Patent Document 1], a muffler that is a spatial volume is provided in a pipe that connects the accumulator and the cylinder chamber of the second compression mechanism. By providing the muffler, the length dimension of the suction passage is optimized, the supercharging loss is suppressed, and the operation efficiency of the compressor is improved.
JP 2005-171847 A

  As described above, the accumulator is attached and fixed to the outer surface of the hermetic case constituting the hermetic compressor, the switching means constituting the pressure switching mechanism, the piping communicating the accumulator and the switching means, the switching means, A pipe having a muffler that communicates with the cylinder chamber of the compression mechanism section 2 is connected, and the compressor unit is assembled.

  Here, the main body part (the part excluding the accumulator) and the accumulator of the hermetic compressor are manufactured separately, and then the accumulator is attached and fixed to the outer surface of the hermetic case of the main body part. The accumulator is preliminarily fixed with a pipe communicating with the accumulator and the switching means and a pipe provided with a muffler that connects the switching means with the cylinder chamber of the second compression mechanism.

  In the hermetic compressor described in [Patent Document 1], a pipe having a muffler that communicates the switching means and the cylinder chamber of the second compression mechanism is fixed to the accumulator with a band made of a thin steel plate. Was.

  Therefore, the position of the piping relative to the accumulator is likely to shift during transportation, etc., and it is necessary to correct the position of the piping when mounting and fixing the accumulator on the outer surface of the sealed case of the main body. The nature was bad. Further, the pulsation of the suction refrigerant accompanying the operation of the hermetic compressor may cause damage at the connection portion of the pipe with the hermetic case.

  The present invention has been made based on the above circumstances, and the purpose of the present invention is to maintain the state before transportation without affecting pipes and the like even if vibration is applied during transportation, and to perform repair work. It is an object of the present invention to provide a hermetic compressor that can maintain reliability as unnecessary and a refrigeration cycle apparatus including the hermetic compressor.

In order to satisfy the above object, a hermetic compressor according to the present invention accommodates an electric motor part, a first compression mechanism part and a second compression mechanism part connected to the electric motor part in the hermetic case, An accumulator is attached and fixed to the outer surface, and the low-pressure refrigerant is sucked into the cylinder chambers of the first and second compression mechanism sections from the accumulator through the communication path.
A pressure switching mechanism is provided in the communication path that communicates the accumulator and the cylinder chamber of the second compression mechanism, and the connection of the second compression mechanism to the cylinder chamber is switched to the low pressure side or the high pressure side of the refrigeration cycle. A low-pressure refrigerant is introduced into the cylinder chamber of the mechanism unit to perform a normal compression operation, or a high-pressure refrigerant is introduced to perform a non-compression operation in which compression is stopped.
The pressure switching mechanism includes a switching means, a first communication passage portion that communicates the switching means and the accumulator, and a second communication passage portion that communicates the switching means and the cylinder chamber of the second compression mechanism portion. At least the second communication passage portion is attached and fixed to the accumulator by welding or brazing, and the accumulator having the second communication passage portion attached and fixed thereto is attached and fixed to the outer surface of the sealed case.

  According to the present invention, even if vibrations associated with transportation are applied, a hermetic compressor that maintains the state before transportation without being affected by the piping and the like, and does not require rework, and maintains reliability, A refrigeration cycle apparatus provided with this hermetic compressor can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a cross-sectional structure of a hermetic compressor R and a refrigeration cycle configuration of a refrigeration cycle apparatus including the hermetic compressor R. (In order to avoid complications in the drawings, there are parts that are not labeled even if they are described. The same applies hereinafter.)
First, from the hermetic compressor R, reference numeral 1 denotes a hermetic case. The lower part in the hermetic case 1 is provided with a first compression mechanism part 2A and a second compression mechanism part 2B. An electric motor unit 3 is provided. All of the first compression mechanism portion 2A, the second compression mechanism portion 2B, and the electric motor portion 3 are connected via a rotating shaft 4.

  The first compression mechanism 2A includes a first cylinder 5A, and the second compression mechanism 2B includes a second cylinder 5B. The main bearing 6 is attached and fixed to the upper surface portion of the first cylinder 5A, and the auxiliary bearing 7 is attached and fixed to the lower surface portion of the second cylinder 5B. The rotating shaft 4 is integrally provided with two eccentric portions that penetrate through the cylinders 5A and 5B and are formed with a phase difference of about 180 °.

Each eccentric part has the same diameter as each other, and is assembled so as to be located in each cylinder 5A, 5B inner diameter part. Eccentric rollers 8a and 8b having the same diameter are fitted on the peripheral surface of each eccentric portion.
A first cylinder chamber 9a is formed inside the first cylinder 5A, and a second cylinder chamber 9b is formed inside the second cylinder 5B. The cylinder chambers 9a and 9b are formed to have the same diameter and height, and a part of the peripheral wall of the eccentric rollers 8a and 8b is accommodated so as to be eccentrically rotatable while being in line contact with a part of the peripheral wall of the cylinder chambers 9a and 9b. The

FIG. 2 is an exploded perspective view showing the first cylinder 5A in the first compression mechanism portion 2A and the second cylinder 5B in the second compression mechanism portion 2B.
Each cylinder 5A, 5B is provided with vane chambers 10a, 10b communicating with the cylinder chambers 9a, 9b, and the vanes 11a, 11b are movably accommodated therein. The front ends of the vanes 11a and 11b are formed in a semicircular shape in plan view, projecting into the cylinder chambers 9a and 9b, and circular peripheral walls 8a and 8b in plan view, regardless of the rotation angle of the eccentric roller. Line contact is possible.

  The first cylinder 5A is provided with a lateral hole 13 for communicating the outer peripheral surface and the vane chamber 10a, and the spring member 14 is accommodated therein. The spring member 14 is interposed between the rear end surface of the vane 11a and the inner peripheral surface of the sealing case 1, and applies an elastic force (back pressure) to the vane 11a.

  No member other than the vane 11b is accommodated in the vane chamber 10b on the second cylinder 5B side. However, as described later, the tip edge of the vane 11b is brought into contact with the eccentric roller 8b in accordance with the setting environment of the vane chamber 10b and the action of the pressure switching mechanism K.

As shown in FIG. 1 again, a discharge pipe 15 is connected to the upper end portion of the hermetic case 1 constituting the hermetic compressor R. The discharge pipe 15 is connected to the upper end portion of the accumulator 20 via the condenser 16, the expansion device 17 and the evaporator 18, and the accumulator 20 and the hermetic compressor R are connected by piping as will be described later.
The hermetic compressor R, the condenser 16, the expansion device 17, the evaporator 18 and the accumulator 20 described above constitute a refrigeration cycle device.

Two pipes 21 and 22 are extended from the bottom of the accumulator 20. One pipe 21 is a suction pipe that penetrates the sealed case 1 constituting the hermetic compressor R and the side of the first cylinder 5A and communicates directly with the first cylinder chamber 9a.
Therefore, the accumulator 20 and the first compression mechanism 2 </ b> A communicate with each other through the suction pipe 21. The other pipe 22 extending from the accumulator bottom 20 is a first communication pipe (first communication path) constituting the pressure switching mechanism K.

  The pressure switching mechanism K includes the first communication pipe 22 and a three-way switching valve (switching means) 23 to which the first communication pipe 22 is connected to a first port. The pipe connected to the second port of the three-way switching valve 23 is a second communication pipe (second communication passage section) 25 that directly communicates with the second cylinder chamber 9b in the second compression mechanism section 2B. .

A muffler 24 that is a space buffer is provided in the middle of the second communication pipe 25. The muffler 24 is composed of a tank or a cylindrical shape having at least an inner diameter larger than the diameter of the pipe.
The pipe 26 connected to the third port of the three-way switching valve 23 is a high-pressure branch pipe that branches from a middle portion of the discharge pipe 15 that communicates the compressor R and the condenser 16. The three-way switching valve 23 uses a four-way switching valve used in a normal heat pump type refrigeration cycle for cost reduction, and the originally provided fourth port is closed by the plug a.

  In this way, the pressure switching mechanism K is provided in the communication passage 28 that communicates the accumulator 20 and the cylinder chamber 9b of the second compression mechanism 2B. As will be described later, the cylinder of the second compression mechanism 2B is provided. The connection to the chamber 9b can be switched to the low pressure side or the high pressure side of the refrigeration cycle.

  In the above-described hermetic compressor R and the refrigeration cycle apparatus equipped with this hermetic compressor R, the pressure switching mechanism K allows switching between normal operation (full capacity operation) and special operation (capacity half operation). Is possible.

  When the full capacity operation is selected, the three-way switching valve 23 is connected to the accumulator 20 on the low pressure side and the first via the first communication pipe 22 which is the first port and the second communication pipe 25 which is the second port. The second cylinder chamber 9b in the second compression mechanism 2B is switched to communicate. The third port is closed, and the high-pressure branch pipe 26 on the high-pressure side and the three-way switching valve 23 do not communicate with each other.

  An operation signal is sent to the motor unit 3 and the rotary shaft 4 is driven to rotate, so that the eccentric rollers 8a and 8b rotate eccentrically in the cylinder chambers 9a and 9b. In the first cylinder 5A, the vane 11a is pressed and urged against the spring member 14, and the leading edge thereof slidably contacts the peripheral wall of the eccentric roller 8a to bisect the inside of the first cylinder chamber 9a.

  The refrigerant gas is sucked into the first cylinder chamber 9a from the accumulator 20 through the suction pipe 21 and is filled. As the eccentric roller 8a rotates eccentrically, the volume of one of the compartments of the cylinder chamber 9a decreases, and the sucked gas is gradually compressed. When the pressure rises to a predetermined pressure, the discharge valve is opened, and the high-pressure gas is guided into the sealed case 1 through the valve cover.

  The high-pressure gas filled in the sealed case 1 is discharged to the discharge pipe 15 and led to the condenser 16. As described above, since the three-way switching valve 23 is switched to allow the accumulator 20 and the second cylinder chamber 9b to communicate with each other, the high-pressure gas is not guided from the discharge pipe 15 to the three-way switching valve 23.

All of the high-pressure gas is condensed and liquefied in the condenser 16, guided to the expansion device 17, and adiabatically expanded, and evaporated in the evaporator 18, thereby removing the latent heat of evaporation from the air flowing through the evaporator 18 and performing a refrigeration action.
The refrigerant evaporated in the evaporator 18 is led to the accumulator 20 for gas-liquid separation, and the separated low-pressure gas refrigerant is led from the accumulator 20 to the first cylinder chamber 9a through the suction pipe 21 and compressed again. It is discharged into the sealed case 1.

  On the other hand, the low-pressure gas refrigerant separated by the accumulator 20 by switching the three-way switching valve 23 is supplied to the second compression mechanism via the first communication pipe 22, the three-way switching valve 23, and the second communication pipe 25. Guided to the second cylinder chamber 9b constituting the portion 2B.

  While the inside of the second cylinder chamber 9b is in a suction pressure (low pressure) atmosphere, the second vane chamber 10b is exposed in the sealed case 1 and is under a discharge pressure (high pressure). The tip of the vane 11b is under a low pressure condition and the rear end is under a high pressure condition, and there is a differential pressure at the front and rear ends.

  Under the influence of this differential pressure, the tip of the vane 11b is pressed and urged so as to be in sliding contact with the peripheral wall of the eccentric roller 8b, and the same compression action as that of the first cylinder chamber 9a is also performed in the second cylinder chamber 9b. Eventually, the full capacity operation is performed in which the compression action is performed in both the first cylinder chamber 9a and the second cylinder chamber 9b.

  When the special operation is selected, the three-way switching valve 23 switches the high-pressure branch pipe 26 and the second communication pipe 25 to communicate with each other. Since the second communication pipe 25 is connected to the second cylinder chamber 9b, the high-pressure branch pipe 26 on the high-pressure side and the second cylinder chamber 9b communicate with each other, and the accumulator 20 on the low-pressure side is connected to the first accumulator 20 The communication pipes 22 are blocked.

  In the first cylinder chamber 9a, the above-described normal compression action is performed, and the high-pressure gas discharged from the discharge pipe 15 is led to the condenser 16, the expansion device 17, and the evaporator 18 as described above, and the refrigeration cycle. It works. Then, the air is sucked into the first cylinder chamber 9a from the accumulator 20 through the suction pipe 21 and compressed.

By switching the three-way switching valve 23, a part of the high-pressure gas guided to the discharge pipe 15 is diverted to the high-pressure branch pipe 26. The high-pressure gas is introduced into the second cylinder chamber 9b through the three-way switching valve 23 and the second communication pipe 25, and the cylinder chamber 9b is increased in pressure.
While the second cylinder chamber 9b is in a discharge pressure (high pressure) atmosphere, the second vane chamber 10b is in the same situation as the high pressure in the case. Both the front and rear ends of the vane 11b are in a high pressure atmosphere, and there is no differential pressure at the front and rear ends. Therefore, the vane 11b is separated from the outer peripheral wall of the eccentric roller 8b and maintains the stopped state, and the compression action in the second cylinder chamber 9b is not performed.

  Eventually, only the compression action in the first cylinder chamber 9a is effective, and the operation is performed with half the capacity. Since the inside of the second cylinder chamber 9b is at a high pressure, no leakage of compressed gas from the sealed case 1 into the second cylinder chamber 9b occurs, and no loss is caused thereby. Therefore, it is possible to operate with half the capacity without lowering the efficiency.

  As described above, the muffler 24 is provided in the second communication pipe 25 that communicates the accumulator 20 and the second cylinder chamber 9b. The low-pressure refrigerant led from the accumulator 20 is temporarily collected in the muffler 24 and then led to the second cylinder chamber 9b.

  As for the flow of the refrigerant, the pressure is relaxed by the muffler 24, and it is considered as if a new flow has come out from the muffler 24 in a divided state. From this, between the accumulator 20 and the muffler 24, the length of a substantial suction pipe becomes short, and the operating frequency which produces a supercharging loss can be made high.

FIG. 3 is an external view of the compressor unit Y.
That is, the compressor unit Y is carried into the assembly site of the refrigeration cycle apparatus in the state shown in the figure, and assembled at a predetermined site. In addition, a condenser 16 that is separately conveyed, an expansion device 17 and an evaporator 18 are attached to predetermined portions. After that, the compressor unit Y and the condenser 16 and the like are communicated with each other through a pipe to complete the refrigeration cycle apparatus.

  The compressor unit Y includes a hermetic compressor R, an accumulator 20, a suction pipe 21 that communicates the accumulator 20 and the first compression mechanism 2A, a three-way switching valve 23 that constitutes a pressure switching mechanism K, an accumulator. 20 includes a first communication pipe 22 that communicates with the three-way switching valve 23, and a second communication pipe 25 that communicates between the three-way switching valve 23 and the second compression mechanism 2B.

  Further, a discharge guide pipe 15 a is connected to the upper end of the hermetic compressor R, an upper suction pipe 15 b is connected to the upper end of the accumulator, and a high pressure branch guide pipe 26 a is connected to the third port of the three-way switching valve 23. At the assembly site, the discharge pipe 15 is connected to the discharge guide pipe 15a and the upper suction pipe 15b, and the high-pressure branch pipe 26 is connected to the high-pressure branch guide pipe 26a.

In the state shown in the figure, a holder 30 is attached and fixed to a part of the outer peripheral surface of the hermetic case 1 constituting the hermetic compressor R by means such as welding, and a band 31 is attached to the holder 30. The band 31 is wound around the accumulator 20, whereby the accumulator 20 is attached and fixed to the peripheral wall of the sealed case 1.
A suction pipe 21 communicating with the first compression mechanism 2A is connected to the bottom of the accumulator 20. As described above, in the accumulator 20, the fastening and fixing by the band 31 is performed, and the suction pipe 21 is connected, whereby the fixing and holding of the accumulator 20 with respect to the hermetic compressor R is complete.

  The second communication pipe 25 is provided with a muffler 24. The muffler 24 is attached and fixed to a part of the outer peripheral wall of the accumulator 20 via a holder 32 as will be described later. Further, one end of the second communication pipe 25 is fixedly attached to the peripheral wall of the sealed case 1 so as to communicate with the second cylinder chamber 9b.

After all, the second communication pipe 25 is attached and fixed at one end to the hermetic case 1, and the muffler 24 provided at the intermediate part of the communication pipe 25 is integrated with the accumulator 20 via the holder 32. The fixed holding of the second communication pipe 25 with respect to the accumulator 20 is complete.
One end of the first communication pipe 22 is attached and fixed to the bottom of the accumulator 20, and the other end is connected to the three-way switching valve 23. The other end of the second communication pipe 25 is also connected to the three-way switching valve 23.

FIG. 4 is a block diagram of the accumulator assembly AA, and FIGS. 5A to 5I show the manufacturing process of the accumulator assembly AA in order.
The accumulator 20 constitutes an outer case by fitting the upper cup 20b into the lower cup 20a. Inside the case, suction pipes 40a and 40b for guiding the gas refrigerant, a separating plate 41, and a filter assembly 42 are incorporated.

The accumulator assembly AA manufactured as described below is brought into contact with the side of the hermetic compressor R, a band 31 is attached to the holder 30 provided in the hermetic case 1, and the accumulator 20 is wound around the band 31.
The suction pipe 21 is connected to the sealed case 1 and communicated with the first cylinder chamber 9a, the second communication pipe 25 is connected to the sealed case 1 and communicated with the second cylinder chamber 9b, and the first By connecting the communication pipe 22 and the second communication pipe 25 to the three-way switching valve 23, the compressor unit Y described above with reference to FIG. 3 is configured.

Next, a manufacturing process of the accumulator assembly AA will be described with reference to FIGS.
As shown in FIG. 5A, a single muffler 24 and a holder 32 having a curved surface capable of contacting a part of the peripheral wall of the muffler 24 and having both end portions as leg portions are prepared. A copper foil is sandwiched between the muffler 24 and the holder 32 curved surface, and the muffler 24 and the holder 32 are temporarily fixed by CO2 welding.

  As shown in FIG. 5B, the holder 32 leg portion with the muffler 24 temporarily fixed in the previous step is applied to the outer peripheral wall of the lower cup 20 a constituting the accumulator 20. Then, a process of attaching and fixing the holder 32 to the lower cup 20a by projection welding is performed.

  As shown in FIG. 5C, the suction pipes 40a and 40b, the separation plate 41, and the filter assembly 42 are assembled in the lower cup 20a, and then the lower cup 20a is covered with the upper cup 20b. Note that a brazing material in the form of a sheet or paste is interposed in the combination portion of the lower cup 20a and the upper cup 20b.

As shown in FIG. 5D, the assembly described above with reference to FIG. 5C is placed in a heating furnace, and a brazing process in the furnace is performed. The copper foil interposed between the muffler 24 and the holder 32 and the brazing material interposed at the joining portion of the lower cup 20a and the upper cup 20b are melted.
After heating for a predetermined time, the accumulator 20 is assembled by taking out and cooling from the heating furnace, and the muffler 24 is integrally attached and fixed to the accumulator 20 via the holder 32.

  As shown in FIG. 5E, the flame brazing process is performed with the upper suction pipe 15b end inserted into the upper end of the accumulator 20 and temporarily held.

  As shown in FIG. 5 (F), the end of the suction pipe 21 bent at a substantially right angle is inserted into the bottom of the accumulator 20, and a flame brazing process is performed in a temporarily held state.

  As shown in FIG. 5G, the end of the first communication pipe 22 bent in a substantially U shape is inserted into the bottom of the accumulator 20, and a flame brazing process is performed in a temporarily held state. The first communication pipe 22 brazed here constitutes only a part of the first communication pipe, not the whole.

  As shown in FIG. 5 (H), a flame brazing process is performed with the second communication pipe lower portion 25a inserted into the bottom of the muffler 24 and temporarily held. The second communicating pipe lower part 25 a brazed here constitutes only between the muffler 24 and the sealed case 1.

  As shown in FIG. 5I, the flame brazing process is performed with the second communication pipe upper portion 25b inserted into the upper portion of the muffler 24 and temporarily held. The second communication pipe upper part 25 b brazed here constitutes only a part between the muffler 24 and the three-way switching valve 23.

By completing the above steps, the accumulator assembly AA described above with reference to FIG. 4 is completed.
By fixing the suction pipe 21 and the second communication pipe 25 to the accumulator 20 in this way, a sub-assembly process is not required when connecting and assembling the accumulator assembly AA and the hermetic compressor R. Will improve.

  And the height of the pipe at the time of joining with piping will also become stable, and the improvement of an assembly precision can be aimed at. Since the piping is fixedly held against the suction pulsation as in the conventional case, fatigue failure of the piping can be prevented and reliability can be improved.

  In the above embodiment, as shown in FIGS. 5A and 5B, a copper foil is sandwiched between the muffler 24 and the holder 32, and the muffler 24 and the holder 32 are temporarily fixed by CO2 welding. Then, although the process of attaching and fixing the holder 32 to the accumulator 20 by projection welding is performed, it is not limited to this.

  For example, as shown in FIGS. 6A and 6B, a sheet-like or paste-like brazing material 45 is interposed between the holder 32 and the accumulator 20, and between the muffler 24 and the holder 32, so that The muffler 24 may be integrated with the accumulator 20 via the holder 32 by brazing. By brazing in the furnace, it can be manufactured at lower cost and higher quality.

  Further, when the accumulator 20, the holder 32, and the muffler 24 are housed in a heating furnace, they are temporarily fixed by spot welding of arc welding such as TIG welding or carbon dioxide gas welding so that the joint positions are not shifted from each other. You may do it.

  In the above-described embodiment, the muffler 24 is projection welded to the lower cup 20a of the accumulator 20 through the holder 32 in the step of FIG. 5B, and the accumulator 20 is inserted into the lower cup 20a in the step of FIG. 5C. These internal components are incorporated and the lower cup 20a is covered with the upper cup 20b in the step of FIG. 5D, and brazing is performed in the furnace. However, the present invention is not limited to this.

  That is, the muffler 24 constituting the second communication pipe 25 and the accumulator 20 are fixed by brazing, and at the same time, the lower cup 20a and the upper cup 20b constituting the accumulator 20 are placed in a furnace using a brazing material. You may comprise so that it may integrate by brazing.

  At this time, as shown in FIG. 7, components such as the suction pipes 40a, 40b, the separation plate 41, and the filter assembly 42 are accommodated in the lower cup 20a constituting the accumulator 20. A ring-shaped brazing material 50 is attached to the base plate. Then, the brazing material 50 is also interposed on the mating surface of the lower cup 20a with the upper cup 20b, and then the upper cup 20b is covered to braze in the integrated furnace.

As the ring-shaped brazing material 50, bronze or tough pitch copper material of about φ1 mm is used. The furnace temperature may be 1130 ° C. in a reducing gas atmosphere.
In the above-described embodiment, the suction pipe 21 is flame brazed to the accumulator 20 in the process of FIG. 5 (F), and the first communication pipe 22 is flame brazed to the accumulator 20 in the process of FIG. 5 (G). 5H, the second lower communication pipe 25a is flame brazed to the muffler 24 in the step of FIG. 5 (H), but is not limited to this.
That is, these pipes 21, 22, 25a may be connected by brazing in the furnace.

  The suction pipe 40a, which is an internal component of the accumulator 20, and the suction pipe 21 may be integrated with each other. However, here, the suction pipes 40a and 40b use iron pipes, and the suction pipe 21 and other external pipes are made of copper. A tube was used to reduce costs.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments.

Sectional drawing of the hermetic type compressor based on embodiment in this invention, and the refrigerating cycle block diagram of the refrigerating cycle apparatus provided with this hermetic type compressor. The perspective view which decomposed | disassembled each one part of the 1st compression mechanism part which comprises the sealed compressor based on the embodiment, and the 2nd compression mechanism part. The front view of the compressor unit based on the embodiment. The block diagram which made the cross section of a part of accumulator assembly based on the embodiment. The figure explaining in order the manufacturing process of the accumulator assembly based on the embodiment. The figure explaining the assembly of an accumulator and a muffler based on the modification of the embodiment. The figure explaining the assembly of the accumulator internal component based on the modification of the same embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sealing case, 3 ... Electric motor part, 2A ... 1st compression mechanism part, 2B ... 2nd compression mechanism part, 20 ... Accumulator, R ... Sealing type compressor, 28 ... Communication path, 9b ... 2nd cylinder Chamber, K ... pressure switching mechanism, 23 ... three-way switching valve (switching means), 22 ... first communication pipe (first communication path), 25 ... second communication pipe (second communication path), 24 ... muffler, 32 ... holder, 20b ... upper cup, 20a ... lower cup, 16 ... condenser, 17 ... expansion device, 18 ... evaporator.

Claims (4)

In the sealed case, the motor unit, the first compression mechanism unit and the second compression mechanism unit coupled to the motor unit are housed, and an accumulator is attached and fixed to the outer surface of the sealed case, and is connected to the accumulator. In the hermetic compressor configured to suck the low-pressure refrigerant into the cylinder chambers of the first compression mechanism portion and the second compression mechanism portion through the passage,
The communication path connecting the accumulator and the cylinder chamber of the second compression mechanism section is switched to the low pressure side or the high pressure side of the refrigeration cycle by switching the connection of the second compression mechanism section to the cylinder chamber, and the second compression mechanism A pressure switching mechanism for introducing a low-pressure refrigerant into the cylinder chamber of the part to perform a normal compression operation, or introducing a high-pressure refrigerant to perform a non-compression operation that is a compression stop,
The pressure switching mechanism is
A switching means, a first communication passage portion that communicates the switching means and the accumulator, and a second communication passage portion that communicates the switching means and the cylinder chamber of the second compression mechanism portion, The second communication path portion is attached and fixed to the accumulator by welding or brazing,
A hermetic compressor characterized in that the accumulator to which the second communication passage portion is attached and fixed is attached and fixed to the outer surface of the hermetic case. A muffler made of a space volume is provided in the second communication path portion that communicates the switching means and the cylinder chamber of the second compression mechanism portion, which constitutes the pressure switching mechanism,
A holder is provided between the muffler and the accumulator,
2. A sheet-like or paste-like brazing material is interposed between the muffler and the holder, and the muffler is integrated with the accumulator via the holder by brazing in a furnace. The hermetic compressor as described. The second communication path and the accumulator are fixed by brazing, and at the same time, the upper cup and the lower cup constituting the accumulator are integrated by brazing using a brazing material. The hermetic compressor according to claim 1.   A refrigeration cycle apparatus comprising the hermetic compressor according to any one of claims 1 to 3, a condenser, an expansion device, and an evaporator to constitute a refrigeration cycle.

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