JP6501876B2 - Compressor muffler - Google Patents

Description

  The present invention relates to a compressor muffler, and more particularly to the arrangement of an inlet pipe and an outlet pipe of a refrigerant.

  In a refrigerant circuit formed by sequentially connecting a compressor, a high pressure side heat exchanger, a throttling device, and a low pressure side heat exchanger with a refrigerant pipe etc., the refrigerant discharged from the compressor is synchronized with the operating frequency of the motor and discharged. Be done. At this time, since the pressure of the refrigerant already in the discharge space is different from the pressure of the compressed refrigerant, the pressure in the space immediately after the discharge fluctuates, and a compressional wave (hereinafter referred to as “pulsating”) of the refrigerant is generated. As one of the suppression methods, the refrigerant immediately after discharge is once released to a space having a sufficiently large volume such as in the compressor or a part of the space, thereby reducing pressure fluctuation in the space and suppressing pulsation. There is a way. However, when the space can not be secured in the compressor, the discharge pressure is high, etc. and pulsation can not be sufficiently mitigated sufficiently, there are dangers such as vibration due to pulsation, increase of noise, pipe breakage due to increase of piping load, etc. is there. Therefore, when the pulsation of the refrigerant circuit is large, a container (hereinafter referred to as a "compressor muffler") having a sufficient volume to alleviate the pulsation of the discharged refrigerant is installed between the compressor and the high pressure side heat exchanger. There is a method of reducing the pulsation of the discharged refrigerant.

  Further, for example, in a rotary compressor, a crankshaft having an eccentric shaft is rotationally driven to compress a refrigerant with a space in the cylinder as a compression chamber. At this time, refrigerator oil is used to lubricate between the parts driven inside the compressor and the parts supporting them and to improve the durability. In the compressor, refrigeration oil is caught in the refrigerant at the time of compression, and is discharged from the compressor together with the high-temperature high-pressure refrigerant. Also in order to secure the amount of lubricating oil required by the compressor, a structure is required that allows the refrigeration oil to quickly return to the compressor.

  For example, in the technology disclosed in Patent Document 1, there is proposed a compressor muffler having a cyclone type oil separation function capable of reducing pulsation due to a refrigerant and separating refrigerator oil from the refrigerant. The inlet pipe and the outlet pipe are attached to the upper lid constituting the outer shell of the compressor muffler, and the oil return pipe is provided on the lower lid constituting the outer shell. And the compressor muffler which concerns on patent document 1 was provided with the cylindrical-shaped rigid body part which connects an upper side cover part and a lower side cover part. The rigid body portion has an advantage that the capacity of the compressor muffler can be easily changed since the rigid body portion can be obtained easily at low cost and easily with a simple configuration, and the length in the pipe core direction can be easily changed.

JP, 2009-74756, A

  However, since the compressor muffler disclosed in Patent Document 1 is provided with the inlet pipe and the outlet pipe in the upper lid, there is a space for fixing the inlet pipe and the outlet pipe to the outer shell by fillet welding. Instead, it was a process of attaching the inlet pipe and the outlet pipe by furnace brazing. As a result, the number of parts and the number of processes have increased, and the cost of manufacturing a compressor muffler has been increased.

  The present invention has been made against the background described above, and has an object to provide a compressor muffler which can be manufactured at low cost while suppressing the manufacturing cost while securing the refrigerant pulsation reducing performance.

The compressor muffler according to the present invention is disposed on the refrigerant discharge side of the compressor of the refrigerant circuit formed by sequentially connecting the compressor, the high pressure side heat exchanger, the expansion device, and the low pressure side heat exchanger, and the compressor A compressor muffler for forming a space for alleviating pulsations of the refrigerant discharged from the housing and storing refrigeration oil separated from the refrigerant in a lower part of the outer shell, the compressor muffler being inserted on the upper surface side of the outer shell Pipe connected to the refrigerant discharge side of the compressor, a lead-out pipe inserted to the lower surface side of the outer shell, and connected to the refrigerant suction side of the high-pressure heat exchanger, the lower portion inside the outer shell And an oil return pipe for connecting the refrigerant suction side of the compressor and returning the refrigeration oil accumulated in the lower part of the outer shell to the compressor, wherein the outer shell is an upper shell component constituting an upper portion of the outer shell And the lower shell part that constitutes the lower part of the outer shell The oil return pipe is connected from the lower shell part of the side surface, the inlet pipe is formed by joining at least two components including inlet tube tip, the outlet pipe has outlet pipe of the outer inner shell the tip of the tip, the outer shell in the upwardly disposed in the vertical direction, so as to be positioned above the distal end of the inlet tube tip of the outer inner shell is fixed to said shell.

  According to the present invention, the compressor muffler fixes the inlet tube to the upper side of the shell, secures the outlet tube to the lower side of the shell, and places the outlet tube tip above the inlet tube tip. The space for welding the inlet and outlet pipes to the outer shell can be secured, which can eliminate the in-furnace brazing step while securing the relaxation performance of the refrigerant pulsation, and the manufacturing cost This makes it possible to obtain a compressor muffler that can be manufactured inexpensively.

It is a schematic block diagram which shows the refrigerant circuit of the refrigerating cycle concerning Embodiment 1 of this invention. It is a side view which shows the structure of the compressor and compressor muffler which concern on Embodiment 1 of this invention. It is explanatory drawing which showed the structure of the compressor muffler 5 in a prior art. It is explanatory drawing which shows the structure of the compressor muffler which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the structure of the compressor muffler which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows the structure of the compressor muffler which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the structure of the compressor muffler which concerns on Embodiment 4 of this invention.

Embodiment 1
FIG. 1 is a schematic configuration view showing a refrigerant circuit of a refrigeration cycle according to a first embodiment of the present invention. The refrigerant circuit is formed by connecting the compressor 1, the compressor muffler 5, the high pressure side heat exchanger 2, the expansion device 3, and the low pressure side heat exchanger 4 by refrigerant pipes. The refrigerant in the refrigerant circuit circulates as follows. The low pressure refrigerant gas is compressed by the compressor 1 and the high pressure refrigerant gas is discharged. The discharged refrigerant passes through the compressor-side discharge pipe 7 and the muffler-side inflow pipe 7a and enters the compressor muffler 5, and the refrigerant and the refrigerator oil are separated. The separated refrigeration oil is returned from the oil return pipe 9 to the suction side of the compressor 1. Thereafter, the high temperature and pressure gas refrigerant enters the high pressure side heat exchanger 2. In the high-pressure side heat exchanger 2, the high-temperature and high-pressure gas refrigerant releases heat and changes its state to a liquid state. The refrigerant that has become a liquid in the high pressure side heat exchanger 2 is expanded by the expansion device 3 and the pressure is reduced. The refrigerant leaving the expansion device 3 absorbs heat in the low pressure side heat exchanger 4 and changes its state back to the gas state. The gaseous refrigerant enters the compressor 1 through the suction pipe 6 and circulates again in the refrigerant circuit.

  FIG. 2 is a side view showing the structures of the compressor 1 and the compressor muffler 5 according to Embodiment 1 of the present invention. The compressor muffler 5 is juxtaposed to the side surface of the compressor 1 so that the refrigerant flows to the compressor muffler 5 immediately after being discharged from the compressor 1. The high-temperature and high-pressure refrigerant compressed by the compressor 1 flows from the compressor-side discharge pipe 7 into the inside of the compressor muffler 5 through the muffler-side inflow pipe 7 a. Thereby, the influence on the refrigerant circuit due to the pulsation of the refrigerant immediately after the discharge from the compressor 1 is minimized. The compressor muffler 5 also has a function of separating refrigeration oil in the refrigerant. The refrigerant from which the refrigerator oil has been separated is sent to the high-pressure heat exchanger 2 through the muffler-side discharge pipe 8. The refrigeration oil accumulates at the bottom of the compressor muffler 5 and is returned to the compressor 1 from the suction pipe 6 through the oil return pipe 9.

  Here, in order to clarify the subject which this invention solves, the compressor muffler 50 in a prior art is demonstrated.

  FIG. 3 is an explanatory view showing the structure of the compressor muffler 50 in the prior art. The outer pipe 26 of the compressor muffler 50 has a structure in which the lead-out pipe 21 and the lead-in pipe 22 are brazed by brazing in the furnace.

  When performing fillet welding in the arrangement of the lead-out pipe 11 and the lead-in pipe 12 in the prior art compressor muffler 5 shown in FIG. 3, the lead-out pipe 11 fixed to the upper shell 13 and the lead-in pipe 12 The gap can not be secured, and fillet welding is difficult. In order to secure the distance between the lead-out pipe 11 and the introduction pipe 12, it is necessary to increase the size of the upper shell 13 and thus the entire size of the compressor muffler 5. It is also conceivable to secure the distance between the lead-out pipe 11 and the lead-in pipe 12 by means of a structure in which the lead-in pipe 12 is inserted from the side of the upper shell 13. The process of drilling holes is required, which causes cost increase. In addition, when piping is connected to the side, there is a concern that the space occupied by the compressor muffler 5 and the piping may increase.

  Brazing can join components of complicated shapes, and is used for joining piping etc. which require airtightness like a refrigerant circuit. Brazing has the advantage of being able to cope with complicated shapes and ensuring air tightness, but when brazing to a thick shell like the shell of the compressor muffler 5, brazing is When heating, the amount of heat is insufficient, the members can not be heated, and the solder may not be melted to the end. In this "in-furnace brazing", a thick member is heated in the furnace over time to warm the entire member and facilitate the penetration of the wax to the back. Therefore, special equipment and time are required, and as a result, the manufacturing cost of the compressor muffler 5 is increased.

In view of the above-described problems of the prior art, in the present embodiment, the brazing process of the inlet pipe 12 and the outlet pipe 11 of the compressor muffler 5 can be eliminated.
FIG. 4 is an explanatory view showing a structure of a compressor muffler according to Embodiment 1 of the present invention. In the present embodiment, the brazing in the furnace of the lead-out pipe 11 and the lead-in pipe 12 which are expensive in processing cost in the prior art is eliminated and changed to fillet welding which can be processed at low cost.

  In the present embodiment, in order to avoid the enlargement of the compressor muffler 5, of the lead-out pipe 11 and the lead-in pipe 12 fixed to the upper shell 13, the lead-out pipe 11 is moved to the lower shell 15 and drawn out. The pipe 11 and the introduction pipe 12 are separated and fixed.

  The outer shell 16 according to the present embodiment is configured of, for example, three parts. The outer shell 16 is composed of an upper shell 13, an intermediate shell 14 and a lower shell 15. The outer shell 16 constitutes a sealed space, and its enlarged volume reduces the pulsation of the refrigerant discharged from the compressor 1. The muffler side inflow pipe 7 a is connected to the introduction pipe 12 fixed to the upper shell 13, and the introduction pipe 12 is connected to the introduction pipe tip 10 inside the compressor muffler 5. The introductory tube distal end portion 10 is horizontally bent so as to be directed substantially in the inner circumferential direction in the outer shell 16. That is, the leading end portion 10 of the introduction pipe is shaped along the cylindrical shape inside the compressor muffler 5. The compressed refrigerant is discharged from the leading end portion 10 of the introduction pipe in the direction along the circumferential direction of the cylindrical surface inside the compressor muffler 5. The compressed refrigerant, which has flowed into the outer shell 16, is swirled and lowered in a spiral manner by being lowered by gravity while performing rotational movement along the inner peripheral surface of the outer shell 16. At this time, since the atomized refrigerant oil in the compressed refrigerant subjected to the centrifugal force has a heavy specific gravity compared with the refrigerant, the cyclone effect in which the refrigerant collides with and adheres to the inner peripheral surface of the outer shell 16 Occur. As a result, the misty refrigerator oil contained in the compressed gas is gradually separated from the refrigerant. The refrigeration oil separated by the centrifugal force gathers on the wall side in the outer shell 16 and falls down and accumulates at the bottom of the compressor muffler 5. The high-temperature and high-pressure gas refrigerant passes through the outlet pipe 11 and is guided from the muffler side discharge pipe 8 to the high pressure side heat exchanger 2.

In the present embodiment, the introduction pipe 12 is inserted through the center of the cylindrical upper shell 13 from the upper surface side and welded by fillet welding. The lead-out pipe 11 is inserted from the lower side to the center of the cylindrical lower shell 15 and welded by fillet welding. Further, the oil return nozzle 9a is welded on the outer periphery of the lower shell 15 by fillet welding. At the end of the inner side of the outer shell 16 of the introducing pipe 12, the introducing pipe tip 10 is silver brazed. At the inner end of the shell of the lead-out pipe 11, silver lead-out of the lead-out pipe tip 11a. In this case, to have a function of the refrigerating machine oil separator to the compressor muffler 5, the previous end of the outlet tube tip section 11a is positioned at a higher Ri by-edge of the introduction tube tip 10. Then, the muffler side inflow pipe 7a is soldered to the introduction pipe 12, the muffler side discharge pipe 8 to the lead pipe 11, and the oil return pipe 9 to the oil return pipe 9a.

  In the present embodiment, the introductory tube distal end portion 10 is described as a structure connected with the introductory tube 12 by silver brazing, but the introductory tube distal end portion 10 and the introductory tube 12 are integrally formed. It may be something. Alternatively, the inlet tube tip 10 and the inlet tube 12 may be connected before the inlet tube 12 is fixed to the upper shell 13. Moreover, although the lead-out pipe | tube front-end | tip part 11a is demonstrated as a structure which silver solders and connects with the lead-out pipe | tube 11, the lead-out pipe front-end part 11a and the lead-out pipe | tube 11 may be shape | molded integrally. Alternatively, the lead-out pipe tip 11 a and the lead-out pipe 11 may be connected before the lead-out pipe 11 is fixed to the lower shell 15.

  Further, although the oil return nozzle 9 a is provided on the outer peripheral portion of the outer shell 16 in the present embodiment, the oil return nozzle 9 a may be fixed so as to be inserted from the lower surface of the lower shell 15.

In the present embodiment, unlike the prior art, the lead-out pipe 11 is disposed at the center of the cylinder of the lower shell 15, and the introduction pipe 12 is disposed at the center of the upper cylinder of the outer shell 16. The inlet pipe tip 10 is disposed so as to separate the refrigerator oil by the cyclone effect as in the prior art. The tip of the lead-out pipe tip 11a is positioned above the tip of the lead-in pipe tip 10 because the refrigerant flowing from the lead-in pipe tip 10 is directed directly upward with the refrigerant oil contained. The purpose is to suppress entry into the portion 11 a and also to prevent the refrigerant oil that has swirled inside the outer shell 16 from being wound up again and separated from the separated refrigerator oil and entering the outlet pipe 11.
The introduction pipe 12 may not be disposed at the center of the upper cylinder of the outer shell 16 as long as the refrigerant can be discharged so as to swirl the inside of the outer shell 16 so as to separate the refrigeration oil.

[Effect by Embodiment 1]
As described above, the compressor muffler 5 of the present embodiment fixes the inlet pipe 12 to the upper shell 13 and fixes the outlet pipe 11 to the lower shell 15 so as to surround the inlet pipe 12 and the outlet pipe 11. Space can be secured. Thereby, the inlet pipe 12 and the outlet pipe 11 can be fillet welded to the outer shell 16. Further, in the compressor muffler 5 of the present embodiment, the refrigerator oil is disposed by disposing the tip of the lead-out pipe tip 11a installed vertically upward in the outer shell 16 above the tip of the introduction pipe tip 10. Therefore, the refrigerant mixed with the refrigerant does not flow out, and the function of separating the refrigeration oil from the refrigerant and the ability to reduce the refrigerant pulsation can be secured. According to the above configuration, it is possible to eliminate the in-furnace brazing step at the time of manufacture while securing the conventional function, thereby suppressing the manufacturing cost and obtaining the compressor muffler 5 which can be manufactured inexpensively.

Second Embodiment
FIG. 5 is an explanatory view showing a structure of a compressor muffler 5a according to Embodiment 2 of the present invention. The compressor muffler 5a according to the present embodiment is configured such that the outer shell 16 of the compressor muffler 5 in the first embodiment is configured from two parts, an upper shell 13 and a lower shell 15.

[Effect of Embodiment 2]
As described above, by eliminating the intermediate shell 14 in the first embodiment, it is possible to reduce the number of parts of the outer shell 16a and the circumferential welding point. Also, the complicated shape of the weld required to weld the intermediate shell 14 in the upper shell 13 and the lower shell 15 can be eliminated. The upper shell 13a and the lower shell 15a can be formed into simple shapes, so that they can be formed by forging such as deep drawing, yield can be improved, and cost can be further reduced compared to the first embodiment. It becomes.

Third Embodiment
FIG. 6 is an explanatory view showing a structure of a compressor muffler 5b according to Embodiment 3 of the present invention. The compressor muffler 5b according to the present embodiment is the compressor muffler 5a according to the first embodiment, in which the introduction pipe 12 and the lead-out pipe 11 are integrally provided with the components constituting the outer shell 16b. The structure of the outer shell 16b is composed of three parts, and in the upper shell 13b and the lower shell 15b, the portions corresponding to the inlet pipe 12 and the outlet pipe 11 are integrally molded and processed. The upper shell 13 and the lower shell 15 are formed and processed by forging or cutting, or both of them. As in the upper shell 13b and the lower shell 15b shown in FIG. 6, the outer peripheral portion and the inner peripheral portion have a shape in which a portion corresponding to the inlet pipe 12 and the outlet pipe 11 is provided at the center of the cylindrical shape. At the same time, it is also possible to process or shape the portions corresponding to the inlet pipe 12 and the outlet pipe 11.

[Effect by Embodiment 3]
As described above, the introduction pipe 12 and the lead-out pipe 11 are fixed by integrally molding the lead-in pipe 12 with the upper shell 13 and the lead-out pipe 11 with the lower shell 15. Furnace brazing can be eliminated. As a result, compared to the first embodiment and the second embodiment, the number of parts and places such as brazing can be reduced, and the cost can be reduced.

Fourth Embodiment
FIG. 7 shows a compressor muffler 5c according to a fourth embodiment of the present invention. With respect to the compressor muffler 5 according to the third embodiment, the outer shell 16c is composed of two parts, an upper shell 13c and a lower shell 15c.

[Effect of Embodiment 4]
As described above, eliminating the intermediate shell 14 can reduce the number of parts and the number of welds. Also, the complicated shape of the weld required to weld the intermediate shell 14 in the upper shell 13 and the lower shell 15 can be eliminated. As a result, the upper shell 13 and the lower shell 15 can be formed by forging such as deep drawing, and the yield at the time of manufacture can be improved. It is possible to further reduce the cost of the compressor muffler 5 according to the third embodiment.

  1 compressor, 2 high pressure side heat exchanger, 3 expansion device, 4 low pressure side heat exchanger, 5 compressor muffler, 5a compressor muffler, 5b compressor muffler, 5c compressor muffler, 6 suction pipe, 7 compressor side Discharge pipe, 7a muffler side inflow pipe, 8 muffler side discharge pipe, 9 oil return pipe, 9a oil return pipe head, 10 inlet pipe tip, 11 outlet pipe, 11a outlet pipe tip, 12 inlet pipe, 13 upper shell, 13a upper side Shell, 13b upper shell, 13c upper shell, 14 middle shell, 15 lower shell, 15a lower shell, 15b lower shell, 15c lower shell, 16 outer shell, 16a outer shell, 16b outer shell, 16c outer shell, DESCRIPTION OF SYMBOLS 20 introduction pipe tip part, 21 lead-out pipe, 22 introduction pipe, 23 upper shell, 24 middle shell, 25 lower shell, 26 outer shell, 27a muffler side inflow pipe , 28 muffler side discharge pipe, 29 oil return pipe, 50 compressor muffler.

Claims (5)

A compressor, a high-pressure side heat exchanger, a throttling device, and a low-pressure side heat exchanger, which are arranged in sequence on the refrigerant discharge side of the compressor of the refrigerant circuit formed by sequentially connecting
A compressor muffler comprising: an outer shell forming a space for alleviating pulsations of the refrigerant discharged from the compressor, wherein the refrigeration oil separated from the refrigerant is accumulated under the outer shell,
An introduction pipe inserted to the upper surface side of the outer shell and connected to the refrigerant discharge side of the compressor;
A lead-out pipe inserted to the lower surface side of the outer shell and connected to the refrigerant suction side of the high-pressure side heat exchanger;
And a return pipe connecting the lower portion inside the outer shell and the refrigerant suction side of the compressor and returning the refrigeration oil accumulated in the lower portion of the outer shell to the compressor;
The shell is
An upper shell part constituting an upper part of the outer shell;
It consists of two parts with the lower shell part which constitutes the lower part of the outer shell,
The oil return pipe is
Connected from the side of the lower shell part,
The introduction pipe is
It is formed by joining at least two parts including the introduction pipe tip,
The outlet pipe is
The tip of the outlet tube distal end of the outer inner shell is the outer shell within the are upwardly installed vertically, so as to be positioned above the distal end of the inlet tube tip of the outer inner shell, the outer shell Fixed to the compressor muffler. The introduction pipe is
The tip of the introductory tube tip located inside the outer shell is fixed to the outer shell so that the refrigerant is discharged horizontally and in a direction inclined with respect to the inner peripheral surface of the outer shell. The compressor muffler according to 1. The introduction pipe is
It is fixed by welding on the upper surface side of the outer shell,
The outlet pipe is
The compressor muffler according to claim 1, wherein the compressor muffler is fixed to the lower surface side of the outer shell by welding. The introduction pipe is
Integrally formed with the outer shell by cutting;
The outlet pipe and the oil return pipe are
The compressor muffler according to claim 1, wherein the compressor muffler is integrally formed with the outer shell by cutting. The introduction pipe is
Integrally formed with the shell by forging;
The outlet pipe and the oil return pipe are
The compressor muffler according to claim 1, wherein the compressor muffler is formed integrally with the shell by forging.

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