JP2012036751A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve volume efficiency by enhancing a heat insulating effect at a suction part, while improving assemblability and reliability by simplifying the shape of a pipe at the suction part of a compressor and inhibiting strength poverty at the connection part of the pipe.SOLUTION: A suction inner pipe 17 is provided inside a suction pipe 14 connected to a suction chamber 13, a heat insulating space 18 is formed between the suction pipe 14 and the suction inner pipe 17, the suction pipe 14 is connected to a suction connection pipe 15 to be connected to a refrigerating cycle, and the suction connection pipe 15 is positioned by the suction inner pipe 17. Thus, there is no need to do stepping or pipe enlarging work for both the suction pipe and the suction connection pipe which are not used for positioning, and the suction connection pipe connected to the suction pipe connected to the suction chamber secures its strength.

Description

  The present invention relates to a compressor that repeatedly sucks, compresses and discharges fluid.

  Conventionally, this type of compressor is provided with a suction pipe so as to introduce a refrigerant into the suction chamber, and in order to insulate the suction pipe from ambient heat, a space is formed around the suction pipe. The space portion is formed between the suction pipe and an outer pipe arranged so as to surround the outside of the suction pipe. The suction pipe or the outer pipe is connected to a pipe through which the refrigerant flows, and the suction pipe is used for positioning the pipe. Alternatively, the outer pipe or the pipe is stepped or expanded (for example, see Patent Document 1).

  FIG. 2 shows a conventional compressor described in Patent Document 1. As shown in FIG. As shown in FIG. 2, a space 23 is formed between the suction pipe 21 and the outer pipe 22 arranged so as to surround the outside of the suction pipe 21, and the suction pipe 21 is connected to a pipe 24 through which the refrigerant flows. The piping 24 is stepped for positioning.

JP 2008-169816 A

  However, the conventional configuration requires a stepped process on the pipe for positioning the pipe. Moreover, since the suction pipe to which the pipe is connected is not directly connected to the suction chamber and is fixed in a cantilever state, it has a problem that bending due to insufficient strength occurs.

  The present invention solves the above-mentioned conventional problems, and simplifies the shape of the tube and suppresses the lack of strength at the connecting portion of the tube, thereby improving the assemblability and reliability, and the heat insulating effect at the suction portion. An object is to provide a highly efficient compressor with high productivity and high reliability by increasing the volumetric efficiency.

  In order to solve the above-described conventional problems, the compressor of the present invention is provided with a suction inner pipe inside a suction pipe connected to the suction chamber, and forms a heat insulating space between the suction pipe and the suction inner pipe. The suction pipe is connected to a suction pipe for connecting to the refrigeration cycle, and positioning is performed by bringing the inlet end of the suction inner pipe into contact with the outlet end of the suction pipe.

  As a result, since neither the suction pipe nor the suction pipe is used for positioning, there is no need for stepping or expansion, and the suction pipe is connected to the suction pipe connected to the suction chamber, so there is no problem of insufficient strength.

  The compressor of the present invention simplifies the shape of the tube, suppresses insufficient strength at the connection portion of the tube, improves the assembly and reliability, enhances the heat insulating effect at the suction portion, and improves the volume efficiency by suction heating. The decrease can be suppressed.

1 is a longitudinal sectional view of a suction portion of a compressor according to Embodiment 1 of the present invention. Vertical section of a conventional compressor

  According to a first aspect of the present invention, there is provided a compression mechanism for compressing the refrigerant provided in the housing, a suction chamber provided in the compression mechanism, a suction pipe for introducing the refrigerant from the outside into the suction chamber, and a suction pipe. A compressor having a suction pipe for connecting to a cycle, the suction pipe being fixed to the housing, provided on the outer periphery of the suction pipe, and an intake pipe provided inside the suction pipe And positioning the suction pipe by bringing the inlet end of the suction pipe and the outlet end of the suction pipe into contact with each other, so that neither the suction pipe nor the suction pipe is used for positioning. Therefore, the suction connection pipe is connected to the suction pipe connected to the suction chamber, so that the strength is ensured.

  In the second invention, in particular, since the inlet end of the suction inner pipe of the first invention is expanded, the suction pipe and the suction inner pipe can be easily fixed.

  In the third aspect of the invention, in particular, by making the thickness of the suction inner pipe of the second invention thinner than the thickness of the suction pipe and the suction pipe, the pipe expansion process can be easily performed.

  In the fourth aspect of the invention, in particular, since the expanded portion of the suction inner pipe of the second or third aspect is located outside the outer periphery of the housing, a heat insulating space is formed in a portion in the housing that is at a high temperature. A decrease in volumetric efficiency due to suction heating can be suppressed.

  In the fifth invention, in particular, since the inner end of the suction pipe of any one of the first to fourth inventions and the outlet end of the suction inner pipe exist at substantially the same position, the positioning of the suction inner pipe can be facilitated. Productivity can be improved.

  In the sixth aspect of the invention, in particular, since the refrigerant gas of any one of the first to fifth aspects is CO2, the discharge temperature is high, so the effect of heat insulation is more remarkable.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a suction portion of a compressor according to a first embodiment of the present invention.

  In FIG. 1, a compression mechanism 12 is accommodated in a housing 11, and a suction chamber 13 is provided in the compression mechanism 12. In addition, a suction pipe 14 for introducing a refrigerant from the outside is connected to the suction chamber 13, and a suction pipe 15 for connecting to the refrigeration cycle is connected to the suction pipe 14. Further, a suction outer tube 16 is provided on the outer periphery of the suction tube 14, and the suction outer tube 16 is fixed to the housing 11. The suction pipe 14 is fixed to the suction outer pipe 16, and the suction inner pipe 17 is fixed inside the suction pipe 14. Here, a heat insulating space 18 is formed between the suction pipe 14 and the suction inner pipe 17. Further, the suction pipe 15 is inserted so that the inlet end 17a of the suction inner pipe 17 and the outlet end 15a of the suction pipe 15 are in contact with each other.

  Next, the assembly process will be described.

First, the suction outer pipe 16 is fixed to the housing 11 by brazing or the like, and the compression mechanism 12 is fixed in the housing 11 by welding or the like. The suction inner pipe 17 is fixed inside the suction pipe 14 by press fitting or the like, and the suction pipe 14 passes through the suction outer pipe 16 and is connected to the suction chamber 13 of the compression mechanism 12. The suction tube 15 is inserted inside the suction tube 14 so that the inlet end 17a of the suction inner tube 17 and the outlet end 15a of the suction tube 15 are in contact with each other, and fixed together with the outer suction tube 16 and the suction tube 14 by brazing or the like. To do.

  Here, since the suction pipe 15 is positioned at the inlet end 17a of the suction inner pipe 17, there is no need for positioning at the connection portion between the suction pipe 14 and the suction pipe 15, so that step processing or pipe expansion processing is not required. Therefore, the shape can be simplified and the cost of parts can be reduced.

  Further, since the suction pipe 14 to which the suction pipe 15 is connected is fixed to the suction chamber 13 and the suction outer pipe 16, there is no problem of insufficient strength.

  Next, the operation and action of the compressor assembled and configured as described above will be described below.

  First, the refrigerant gas returned from the refrigeration cycle passes through the suction pipe 15, passes through the suction inner pipe 17, and reaches the suction chamber 13. A part of the refrigerant reaching the suction chamber 13 is guided to the heat insulating space 18 between the suction pipe 14 and the suction inner pipe 17.

  The refrigerant gas passing through the inside of the suction inner pipe 17 can suppress heat transfer from the outer periphery of the suction pipe 14 by the refrigerant gas guided to the heat insulating space 18, reduce suction heating, and improve volumetric efficiency. Can do.

  As shown in FIG. 1, since the inlet end 17a of the suction inner pipe 17 is expanded and press-fitted into the suction pipe 14, the suction pipe 14 and the suction inner pipe 17 can be easily fixed.

  As shown in FIG. 1, the expansion of the inner pipe 17 is facilitated by making the thickness of the suction inner pipe 17 thinner than the thickness of the suction pipe 14 or the suction contact pipe 15.

  As shown in FIG. 1, since the expanded portion 17b of the suction inner pipe 17 is located outside the outer periphery of the housing 11, a heat insulation space 18 is formed in a portion exposed to a high temperature, so that the heat insulation effect is improved. To do.

  As shown in FIG. 1, since the inner end 14a of the suction pipe 14 and the outlet end 17c of the suction inner pipe 17 are located at substantially the same position, the positioning of the suction inner pipe 17 can be facilitated.

  Moreover, when CO2 is used as the refrigerant gas, since the discharge temperature is high, the effect of heat insulation is more remarkable.

  As described above, the compressor according to the present invention simplifies the shape of the tube, suppresses insufficient strength at the connection portion of the tube, improves the assembly and reliability, and enhances the heat insulating effect at the suction portion, Since a decrease in volumetric efficiency due to suction heating can be suppressed, a highly efficient compressor with high productivity and excellent reliability can be provided. Furthermore, it is possible to make the product more comfortable and environmentally friendly as an air conditioner such as a room air conditioner or a heat pump water heater.

DESCRIPTION OF SYMBOLS 11 Housing 12 Compression mechanism 13 Suction chamber 14 Suction pipe 14a Inner end 15 Suction contact pipe 16 Suction outer pipe 17 Suction inner pipe 17a Inlet end 17b Expanded part 17c Outlet end 18 Thermal insulation space

Claims (6)

A compression mechanism for compressing a refrigerant provided in the housing, a suction chamber provided in the compression mechanism, a suction pipe for introducing a refrigerant into the suction chamber from the outside, and a refrigeration cycle in the suction pipe A compressor having a suction pipe for connection,
A suction outer pipe fixed to the housing and provided on an outer periphery of the suction pipe;
A suction inner pipe provided inside the suction pipe, and
The compressor characterized in that an inlet end of the suction inner pipe and an outlet end of the suction contact pipe are in contact with each other. The compressor according to claim 1, wherein an inlet end of the suction inner pipe is expanded. The compressor according to claim 2, wherein a thickness of the suction inner pipe is smaller than a thickness of the suction pipe and the suction contact pipe. The compressor according to claim 2 or 3, wherein the expanded portion of the suction inner pipe is located outside the outer periphery of the housing. The compressor according to any one of claims 1 to 4, wherein an inner end of the suction pipe and an outlet end of the suction inner pipe exist at substantially the same position. The compressor according to any one of claims 1 to 5, wherein the refrigerant gas is CO2.