JP2013119826A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor having high efficiency by reducing heat received from refrigerant gas passing through inside a suction muffler.SOLUTION: Ribs 161 and 165 having a width equal to a thickness of a wall surface 155 of a muffler body 145 for supporting an inlet pipe 153 and an outlet pipe 163 of a suction muffler 131, are respectively arranged on the wall surface 155 of the muffler body. Thus, since heat generated by a motor-driven element 111 and a compression element 113 in a sealed vessel 101 is hardly transmitted to the cold refrigerant gas 115 passing through the inlet pipe 153 and the outlet pipe 163 while holding rigidity of the wall surface 155 of the muffler body 145, a heat receiving loss is reduced, so that the highly efficient and low noise hermetic compressor can be provided.

Description

  The present invention relates to a compressor used in a refrigeration apparatus or the like.

  As a conventional hermetic compressor, there is one that suppresses wall surface vibration by improving the rigidity of the wall surface of the suction muffler and achieves low noise (for example, see Patent Document 1).

  Hereinafter, the conventional hermetic compressor will be described with reference to the drawings.

  4 is a cross-sectional view of a conventional hermetic compressor, FIG. 5 is a cross-sectional view of the main part of a suction muffler used in the conventional hermetic compressor, and FIG. 6 is a cross-sectional view taken along line BB in FIG. It is.

  4, 5, and 6, the sealed container 1 includes a discharge pipe (not shown) connected to a cooling system (not shown) and a suction pipe 3, and stores and fixes oil 5 at the bottom. An electric element 11 including a child 7 and a rotor 9 and a compression element 13 driven by the electric element 11 are accommodated, and the inside is filled with a refrigerant gas 15.

  Next, the main configuration of the compression element 13 will be described.

  The cylinder 17 includes a substantially cylindrical compression chamber 19 and a bearing portion 21. The valve plate 23 includes a discharge valve device 25 on the side opposite to the cylinder 17 and closes the compression chamber 19.

  The head 27 covers the valve plate 23 and forms a discharge chamber 29. One end of the suction muffler 31 opens into the sealed container 1, and the other end communicates with the compression chamber 19 via a suction valve 33.

  The crankshaft 35 has a main shaft portion 37 and an eccentric portion 39, and is supported by the bearing portion 21 of the cylinder 17 and the rotor 9 is press-fitted and fixed.

  The piston 41 is inserted into the compression chamber 19 so as to be slidable back and forth, and is connected to the eccentric portion 39 by a connecting rod 43.

  Next, the suction muffler 31 provided in the compression element 13 will be described.

  The suction muffler 31 includes a muffler main body 45 and a muffler cover 47, and is coupled to each other by a method such as welding to form a muffler space 49.

  One end of the inlet pipe 51 opens into the sealed container 1 and the other end opens into the suction muffler 31, and is formed integrally with the wall surface 53 of the muffler main body 45.

  One end of the outlet pipe 55 opens in the approximate center of the muffler space 49 of the suction muffler 31, and the other end opens in the compression chamber 19 through the suction valve 33. It is integrally formed.

  The operation of the hermetic compressor configured as described above will be described below.

The pressure pulsation generated in the compression chamber 19 propagates in the direction opposite to the flow of the refrigerant gas 15, and the outlet pipe 55.
Through the muffler space 49. At this time, since the rigidity of the wall surface 53 of the muffler main body 45 is improved by integrally forming the inlet pipe 51 and the outlet pipe 55 against the vibration caused by pressure pulsation, the vibration of the wall surface 53 of the muffler main body 45 is sufficient. To be suppressed.

  Therefore, the noise accompanying the wall vibration can be reduced. In particular, the vibration of the wall surface 53 on the closed container 1 side with respect to the wall surface 53 on the electric element 11 side of the muffler main body 45 tends to appear as noise because it is closer to the closed container 1 that is a noise radiation surface as a hermetic compressor. Therefore, increasing the rigidity of the side wall surface 53 of the sealed container 1 of the muffler main body 45 is effective in reducing noise.

  Further, by opening one end of the outlet pipe 55 at substantially the center of the muffler space 49, low-order resonance vibrations that the muffler space 49 has independently, that is, vibrations with the substantial center of the muffler space 49 as a vibration antinode are suppressed. Therefore, the noise can be reduced more effectively by attenuating the frequency component corresponding to this vibration of the pressure vibration.

JP 2005-113925 A

  However, in the conventional configuration, the inlet pipe 51 and the outlet pipe 55 are integrally formed in contact with the wall surface 53 of the muffler main body 45 so that the cold refrigerant gas 15 returned from the suction pipe 3 is absorbed by the suction muffler. When passing through the inlet pipe 51 and the outlet pipe 55, the heat is generated by the heat generated by the electric element 11 and the compression element 13 in the sealed container 1. As a result, the heat receiving loss is increased and the refrigeration capacity is lowered, so that the efficiency of the hermetic compressor is lowered.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a high-efficiency, low-noise hermetic compressor that maintains the rigidity of the wall surface of the muffler body, reduces heat receiving loss.

  In order to solve the above-described conventional problems, the hermetic compressor of the present invention includes ribs having a width equivalent to the wall thickness of the muffler body supporting the inlet pipe and the outlet pipe of the suction muffler, respectively. Is provided.

  This makes it difficult to transfer the heat generated by the electric element or compression element in the sealed container to the cold refrigerant gas passing through the inlet pipe and outlet pipe while maintaining the rigidity of the wall surface of the muffler body. It has the effect | action which reduces.

  Since the hermetic compressor of the present invention reduces the heat receiving loss while maintaining the rigidity of the wall surface of the muffler body, a highly efficient and low noise hermetic compressor can be provided.

Sectional drawing of the hermetic compressor in Embodiment 1 of this invention Sectional drawing of the principal part of the suction muffler used for the hermetic compressor in Embodiment 1 of the present invention. AA line sectional view of FIG. Cross section of a conventional hermetic compressor Cross section of the main part of a suction muffler used in a conventional hermetic compressor BB sectional view of FIG.

  The invention according to claim 1 is a sealed container, an electric element disposed in the sealed container, a compression element that is rotationally driven by the electric element, a suction pipe disposed in the sealed container, a muffler body, A suction muffler comprising a muffler cover, wherein the muffler body has an inlet pipe having one end opened in the sealed container and the other end opened in the suction muffler, and one end opened in the suction muffler. The end is provided with an outlet pipe that opens to the compression element, and a wall having a width equal to the wall thickness of the wall that supports the inlet pipe and the outlet pipe, and includes a wall surface excluding the upper wall surface among the wall surfaces that form the muffler space. Each is provided on the wall.

  By adopting such a configuration, the rigidity is maintained by the rib provided on the wall surface of the muffler body against vibration due to pressure pulsation in the suction muffler, so that vibration of the wall surface of the muffler body is sufficiently suppressed, and The rib having a width equivalent to the wall thickness makes it difficult to transfer heat generated from the electric element and the compression element in the sealed container to the cold refrigerant gas passing through the inlet pipe and the outlet pipe. As a result, since the heat receiving loss is reduced, it is possible to provide a highly efficient and low noise hermetic compressor.

  According to a second aspect of the present invention, in the first aspect of the present invention, the rib is provided on the side wall surface of the closed container of the suction muffler.

  By adopting such a configuration, it is possible to further reduce heat reception by suppressing the wall vibration on the side of the sealed container that is likely to appear as noise, and by providing ribs on the side wall of the sealed container whose temperature is lower than that of the electric element side wall. Furthermore, it is possible to provide a hermetic compressor with higher efficiency and lower noise.

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

(Embodiment 1)
1 is a cross-sectional view of a hermetic compressor according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a main part of a suction muffler used in the hermetic compressor according to Embodiment 1 of the present invention. 3 is a cross-sectional view taken along line AA in FIG.

  1, 2, and 3, the sealed container 101 includes a discharge pipe (not shown) connected to a cooling system (not shown) and a suction pipe 103, and stores oil 105 at the bottom and a stator. An electric element 111 composed of 107 and a rotor 109 and a compression element 113 driven by the electric element 111 are accommodated, and the inside is filled with a refrigerant gas 115.

  Next, the main configuration of the compression element 113 will be described.

  The cylinder 117 includes a substantially cylindrical compression chamber 119 and a bearing portion 121. The valve plate 123 includes a discharge valve device 125 on the side opposite to the cylinder 117 and closes the compression chamber 119. The head 127 covers the valve plate 123 and forms a discharge chamber 129.

  One end of the suction muffler 131 opens into the sealed container 1, and the other end communicates with the compression chamber 119 via the suction valve 133.

The crankshaft 135 has a main shaft portion 137 and an eccentric portion 139, and is supported by the bearing portion 121 of the cylinder 117, and the rotor 109 is press-fitted and fixed.

  The piston 141 is inserted into the compression chamber 119 so as to be slidable back and forth, and is connected to the eccentric portion 139 by a connecting rod 143.

  Next, the suction muffler 131 provided in the compression element 113 will be described.

  The suction muffler 131 is a silencer as a means for attenuating noise generated in the compression chamber 119 and the suction valve 133. From the viewpoint of improving the performance of the hermetic compressor, it is desirable to be made of a material having low thermal conductivity, such as a synthetic resin material. The synthetic resin material is preferably a PBT or PPS material in consideration of the usage environment such as a refrigerant gas atmosphere and high temperature.

  The suction muffler 131 includes a muffler main body 145 and a muffler cover 147, and normally forms the suction muffler 131 by being welded together by an ultrasonic welding method or the like. The muffler cover 147 is flat and has a simple shape, and has a function as an upper wall surface that forms the muffler space 149.

  The introduction portion 151 is formed integrally with the muffler main body 145, one end opens in the sealed container 101, and the other end opens in the inlet pipe 153, and the wall surface forming the introduction portion 151 and the wall surface 155 forming the muffler main body 145. Unlike the other wall surfaces that remain coincident with each other only on the back surface 157, the sealed container 101 side opening 159 of the introduction portion 151 has a substantially rectangular opening shape and has a space in a substantially rectangular parallelepiped and has a direction facing the suction pipe 103. have.

  One end of the inlet pipe 153 opens into the sealed container 101 and the other end opens into the suction muffler 131, and the side wall surface 155 of the sealed container 101 of the muffler body 145 has a width equivalent to the wall thickness of the wall surface 155. The rib 161 is supported and formed.

  One end of the outlet pipe 163 opens to the approximate center of the muffler space 149 of the suction muffler 131, and the other end opens to the compression chamber 119 via the suction valve 133. The outlet pipe 163 opens on the side wall surface 155 of the sealed container 101 of the muffler body 145. The ribs 165 having a width equivalent to the wall thickness of the wall surface 155 are supported and formed.

  The operation and action of the hermetic compressor configured as described above will be described below.

  The cold refrigerant gas 115 returned from the suction pipe 103 flows into the muffler space 149 from the inlet pipe 153 through the introduction portion 151, passes through the outlet pipe 163, and is sent to the compression chamber 119 to obtain higher efficiency. Can do.

  Ribs 161 and 165 having a width equivalent to the wall thickness of the wall surface 155 of the muffler main body 145 are formed on the wall surface 155 of the suction muffler main body 145, and the inlet pipe 153 and the outlet pipe 163 are supported, respectively. The transfer of heat generated by the electric element 111 and the compression element 113 in 101 can be minimized. (Ie the heat transfer area can be minimized). As a result, the heat receiving loss to the cold refrigerant gas 115 passing through the inlet pipe 153 and the outlet pipe 163 is reduced.

  Further, by making the widths of the ribs 161 and 165 equal to the wall thickness of the wall surface 155, the suction muffler body 145 can be molded without sink or distortion.

In the first embodiment, the wall thickness 155 of the suction muffler body 145 is about 1.5 mm, and the width of the ribs 161 and 165 is about 1 of the wall thickness of the wall surface 155 of the suction muffler body 145.
. This action and effect are made effective by constituting as 0 to 2.0 times.

  Therefore, since the refrigerant gas 115 passing through the suction muffler 131 can be sent to the compression chamber 119 at a lower temperature, a highly efficient hermetic compressor can be provided.

  On the other hand, the pressure pulsation generated in the compression chamber 119 propagates in the direction opposite to the flow of the refrigerant gas 115 and is temporarily opened to the muffler space 149 through the outlet pipe 163. At this time, the wall surface 155 of the muffler main body 145 is formed by supporting the inlet pipe 153 and the outlet pipe 163 with ribs 161 and 165 having a width equivalent to the wall thickness of the wall surface 155 against vibration due to pressure pulsation. Therefore, the vibration of the wall surface 155 of the muffler body 145 is sufficiently suppressed. Therefore, the noise accompanying the wall vibration can be reduced at the same time.

  In particular, the vibration of the wall surface 155 on the sealed container 101 side with respect to the wall surface 155 on the electric element 111 side of the muffler main body 145 appears as noise because it is closer to the sealed container 101 which is a noise radiation surface as a hermetic compressor. Cheap. Further, the wall surface 155 on the closed container 101 side is less susceptible to heat from the electric element 111 than the wall surface 155 on the electric element 111 side, and the temperature of the wall surface 155 is low, so that the ribs 161 and 165 are connected to the closed container 101 side. By forming it on the wall surface 155, it is possible to provide a hermetic compressor with higher efficiency and lower noise.

  As described above, the compressor according to the present invention is a high-efficiency and low-noise compressor, can be applied to a compressor used in a refrigeration cycle, and can be widely mounted in a refrigeration apparatus. In addition, an article storage device equipped with such a compressor can be applied to various devices such as a dehumidifier, a showcase, and a vending machine, including a household refrigerator, and is widely applied as a storage device with reduced power consumption. be able to.

101 Sealed Container 103 Suction Pipe 111 Electric Element 113 Compression Element 131 Suction Muffler 145 Muffler Body 147 Muffler Cover 149 Muffler Space 153 Inlet Pipe 155 Wall Face 163 Outlet Pipe 161, 165 Rib

Claims (2)

An airtight container, an electric element disposed in the airtight container, a compression element that is rotationally driven by the electric element, a suction pipe disposed in the airtight container, a suction muffler including a muffler body and a muffler cover, The muffler body has an inlet pipe having one end opened in the sealed container and the other end opened in the suction muffler, and an outlet opened in the suction muffler and the other end opened in the compression element. A hermetic compressor including a pipe and a wall surface excluding the upper wall surface among the wall surfaces forming the muffler space, each having a rib having a width equivalent to a wall thickness supporting the inlet pipe and the outlet pipe. . The hermetic compressor according to claim 1, wherein the rib is provided on a side wall surface of the hermetic container of the suction muffler.