JP2012036750A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve volume efficiency by enhancing a heat insulating effect while reducing pressure loss at the suction part of a compressor.SOLUTION: A suction inner pipe 17 is provided inside a suction pipe 14, the suction pipe 14 is connected to a suction connection pipe 15 to be connected to a refrigerating cycle, the inner diameter of the suction inner pipe 17 is set larger than the inner diameter of the suction connection pipe 15, and a clearance is provided between an inlet end 17a of the suction inner pipe 17 and an outlet end 15a of the suction connection pipe 15. Refrigerant is introduced into a heat insulating space 18 between the suction inner pipe 17 and the suction pipe 14 to reduce pressure loss due to a flow path resistance without reducing a flow path cross section, thus suppressing the degradation of volume efficiency due to suction heating.

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 disposed so as to surround the outside of the suction pipe, and the outer pipe is connected to a pipe through which the refrigerant flows (see, for example, Patent Document 1).

  FIG. 3 shows a conventional compressor described in Patent Document 1. As shown in FIG. As shown in the figure, 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 outer pipe 22 is connected to a pipe 24 through which the refrigerant flows. ing.

JP 2008-169816 A

  However, in the conventional configuration, the cross-sectional area is reduced with respect to the piping at the suction pipe inlet, and pressure loss occurs. Further, when the suction pipe is connected to the pipe, the refrigerant is not guided to the space portion, so that there is a problem that the heat insulating effect is lowered.

  The present invention solves the above-described conventional problems, and provides a highly efficient compressor by reducing pressure loss at the suction portion, guiding refrigerant to the space, enhancing the heat insulation effect, and improving volumetric efficiency. The purpose is to do.

  In order to solve the above-described conventional problems, the compressor of the present invention is provided with a suction inner pipe inside the suction pipe, connected to the suction suction pipe for connecting the suction pipe to the refrigeration cycle, and the inner diameter of the suction inner pipe is reduced. It is larger than the inner diameter of the suction pipe, a gap is provided between the inlet end of the suction inner pipe and the outlet end of the suction suction pipe, and the refrigerant is guided to the space between the suction inner pipe and the suction pipe.

  Thereby, there is no pressure loss due to the reduction in the cross-sectional area, and the refrigerant can be guided to the space.

  The compressor of the present invention can reduce pressure loss due to flow path resistance, and can suppress a decrease in volumetric efficiency due to suction heating.

1 is a longitudinal sectional view of a suction portion of a compressor according to Embodiment 1 of the present invention. Fig. 8 is a longitudinal sectional view of a suction portion of a compressor according to Embodiment 2 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 the inner diameter of the suction inner pipe is larger than the inner diameter of the suction tube, so that there is no reduction in the cross-sectional area of the flow path, pressure loss due to flow path resistance is reduced, and volumetric efficiency is reduced due to suction heating. Can be suppressed.

  According to the second aspect of the present invention, a gap is formed between the inlet end of the suction inner pipe and the outlet end of the suction pipe, so that the refrigerant is guided to the space between the suction inner pipe and the suction pipe and insulated from the surrounding heat. In addition, it is possible to suppress a decrease in volume efficiency due to suction heating.

  In the third aspect of the invention, in particular, since the inlet end of the suction inner pipe of the first or second aspect of the invention is positioned outside the outer periphery of the housing, the high temperature portion in the housing has a double pipe structure. A decrease in volumetric efficiency due to suction heating can be suppressed.

  In the fourth invention, in particular, the outlet end of the suction tube of the first to third inventions is expanded, and the inlet end of the suction inner tube overlaps the inside of the expanded portion of the suction tube. Since all have a double-pipe structure, it is possible to suppress a decrease in volumetric efficiency due to suction heating.

  In particular, the fifth aspect of the invention is characterized in that the outer end of the suction pipe of the first to fourth aspects of the invention and the outer end of the suction outer pipe are located at substantially the same position, thereby fixing the suction pipe and the suction outer pipe, And the suction tube can be fixed simultaneously by brazing or the like, which facilitates manufacture.

  In the sixth aspect of the invention, in particular, since the outlet end of the suction inner pipe of the first to fifth inventions is expanded, the suction pipe and the suction inner pipe can be easily fixed. Further, since the refrigerant guided between the suction inner pipe and the suction pipe does not flow into the suction chamber, suction heating by the refrigerant warmed from the surroundings can be suppressed.

  In the seventh invention, in particular, the refrigerant gas according to any one of the first to sixth inventions is CO2, so that the discharge temperature is high, and thus 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. The compression mechanism 12 is provided with a suction chamber 13, and the suction chamber 13 is provided with a suction pipe 14 for introducing a refrigerant from the outside. Further, a suction pipe 15 for connecting to the refrigeration cycle is connected to the suction pipe 14. A suction outer pipe 16 is provided on the outer periphery of the suction pipe 14, and the suction outer pipe 16 is fixed to the housing 11. Further, the suction pipe 14 is fixed to the suction outer pipe 16. Further, an inner suction pipe 17 is provided inside the suction pipe 14.

  The inner diameter of the suction inner tube 17 is larger than the inner diameter of the suction tube 15, and there is a gap between the inlet end 17 a of the suction inner tube 17 and the outlet end 15 a of the suction tube 15.

  About the compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

First, the refrigerant gas that has returned from the refrigeration cycle reaches the suction pipe 14 through the suction pipe 15. Most of the refrigerant gas that has reached the suction pipe 14 passes through the inside of the suction inner pipe 17, is led to the suction chamber 13, and the remaining part is led to the heat insulating space 18 between the suction pipe 14 and the suction inner pipe 17. It is burned.

  The refrigerant gas passing through the inside of the suction inner pipe 17 has a larger inner diameter of the suction inner pipe 17 than the inner diameter of the suction contact pipe 15, so that pressure loss does not occur. Heat transfer from the outer periphery can be suppressed, suction heating can be reduced, and volumetric efficiency can be improved.

  Further, as shown in FIG. 1, since the inlet end 17 a of the suction inner pipe 17 is positioned outside the outer periphery of the housing 11, the heat insulating space 18 is formed outside the outer periphery of the housing 11. Since the portion exposed to the high-temperature refrigerant gas is insulated, the reduction in suction heating is large, and the volume efficiency is improved.

(Embodiment 2)
FIG. 2 is a longitudinal sectional view of the suction portion of the compressor according to the second embodiment of the present invention.

  In FIG. 2, a compression mechanism 12 is accommodated in a housing 11, and a suction chamber 13 is provided in the compression mechanism 12. The suction chamber 13 is provided with a suction pipe 14 for introducing a refrigerant from the outside, and a suction pipe 15 for connecting to the refrigeration cycle is connected to the suction pipe 14. A suction outer pipe 16 is provided on the outer periphery of the suction pipe 14, the suction outer pipe 16 is fixed to the housing 11, and the suction pipe 14 is fixed to the suction outer pipe 16. A suction inner pipe 17 is provided inside the suction pipe 14, and the inner diameter of the suction inner pipe 17 is larger than the inner diameter of the suction contact pipe 15, and there is a gap between the inlet end 17 a of the suction inner pipe 17 and the outlet end 15 a of the suction contact pipe 15. .

  Here, in the compressor of the present embodiment, the outlet end 15 a of the suction tube 15 is expanded, and the inlet end 17 a of the suction inner tube 17 overlaps the inside of the expanded portion 15 b of the suction tube 15.

  About the compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, most of the refrigerant gas returned from the refrigeration cycle passes through the suction pipe 15 and is introduced into the suction chamber 13 through the inside of the suction inner pipe 17 overlapping the inside of the expanded portion 15b of the suction pipe 15. It is burned. The remaining part is directly led from the suction pipe 15 to the heat insulation space 18 between the suction pipe 14 and the suction inner pipe 17, and the heat insulation space 18 is formed in the entire suction pipe 14.

  The refrigerant gas passing through the inside of the suction inner pipe 17 has a larger inner diameter of the suction inner pipe 17 than the inner diameter of the suction contact pipe 15, so that pressure loss does not occur. Heat transfer from the outer periphery can be suppressed over the entire length of the suction pipe 14, so that suction heating can be reduced and volumetric efficiency can be improved.

  1 and 2, since the outer end 14a of the suction pipe 14 and the outer end 16a of the suction outer pipe 16 exist at substantially the same position, the fixing of the suction pipe 14 and the suction outer pipe 16; Since the suction pipe 14 and the suction pipe 15 can be fixed simultaneously by brazing, the manufacturing process can be facilitated.

  As shown in FIGS. 1 and 2, the outlet end 17 b of the suction inner pipe 17 is expanded and press-fitted into the outlet end 14 b of the suction pipe 14. Therefore, the suction pipe 14 and the suction inner pipe 17 can be easily fixed, and the refrigerant gas guided to the heat insulation space 18 stays in the heat insulation space 18 and does not flow into the suction chamber 13, and is thus warmed from the surroundings. Inhalation heating by the refrigerant in the heat insulation space 18 is suppressed.

  In addition, 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 can reduce the pressure loss due to the reduction in the cross-sectional area of the flow path, and can suppress the decrease in volumetric efficiency by reducing the suction heating in the heat insulating space. 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 Outer end 14b Outlet end 15 Suction tube 15a Outlet end 15b Expanded part 16 Suction outer pipe 16a Outer end 17 Suction inner pipe 17a Inlet end 17b Outlet end 18 Thermal insulation space

Claims (7)

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 according to claim 1, wherein an inner diameter of the suction inner pipe is larger than an inner diameter of the suction contact pipe. The compressor according to claim 1, wherein there is a gap between an inlet end of the suction inner pipe and an outlet end of the suction contact pipe. The compressor according to claim 1 or 2, wherein an inlet end of the suction inner pipe is located outside an outer periphery of the housing. The outlet end of the suction tube is expanded, and the inlet end of the suction inner tube overlaps the inside of the expanded portion of the suction tube. Compressor. The compressor according to any one of claims 1 to 4, wherein an outer end of the suction pipe and an outer end of the suction outer pipe exist at substantially the same position. The compressor according to any one of claims 1 to 5, wherein an outlet end of the suction inner pipe is expanded. The compressor according to any one of claims 1 to 6, wherein the refrigerant gas is CO2.