JP2016176452A - Hermetic type compressor and refrigeration device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic type compressor with high durability which prevents lowering of the natural frequency of a discharge path and which prevents breakage and avoids resonance of a discharge inlet pipe and a discharge outlet pipe due to vibration during an operation of the hermetic type compressor, even when an intermediate muffler is provided between the discharge inlet pipe and the discharge outlet pipe in the discharge path.SOLUTION: Even when an intermediate muffler 168 having large mass is connected between a discharge inlet pipe 164 and a discharge outlet pipe 166 in a discharge path 154, the intermediate muffler 168 is fixed to a cylinder block 134. Thereby, lowering of the natural frequency of the discharge path 154 can be prevented, and the natural frequency of the discharge path 154 does not come close to the operation frequency of a hermetic type compressor. Thus, resonance of the discharge inlet pipe 164 and the discharge outlet pipe 166 due to the vibration during an operation of the hermetic type compressor can be avoided and breakage can be prevented, and durability of the hermetic type compressor can be improved.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hermetic compressor and a refrigeration apparatus such as a household electric refrigerator-freezer and a showcase using the same.

  Conventionally, this type of hermetic compressor reduces the pressure pulsation of the refrigerant gas that is compressed and discharged by the compression element, and suppresses the thermal effect that the cylinder receives from the high-temperature discharged refrigerant gas. There is one in which an intermediate muffler is provided in the discharge path leading out of the sealed container (for example, see Patent Document 1).

  FIG. 6 is a longitudinal sectional view of a conventional hermetic compressor described in Patent Document 1, and FIG. 7 is a transverse sectional view of the conventional hermetic compressor described in Patent Document 1.

  As shown in FIGS. 6 and 7, the conventional hermetic compressor stores oil (not shown) at the bottom of the hermetic container 1 and is filled with the refrigerant gas 3 so that the compressor main body 5 is suspended. The spring 7 is elastically supported in the sealed container 1. A discharge pipe 11 and a suction pipe 13 communicating with the inside and outside of the sealed container 1 are fixed to the sealed container 1 by welding or the like, and are connected to a high pressure side and a low pressure side of a refrigeration apparatus (not shown), respectively. .

  The compressor body 5 includes an electric element 25 composed of a stator 21 and a rotor 23, and a compression element 31 disposed above the electric element 25.

  The compression element 31 includes a cylinder block 37 in which a cylinder 33 and a bearing 35 are integrally formed, a piston 39 that reciprocates in the cylinder 33, an eccentric shaft 41, and a main shaft 43 that is supported by the bearing 35. A connecting means 47 for connecting the shaft 45, the eccentric shaft 41 and the piston 39, a valve plate 51 for sealing the opening end face of the cylinder 33 opposite to the crankshaft 45, and a cylinder head 53 for covering the valve plate 51. And a discharge path 55 that connects the cylinder block 37 and the discharge pipe 11.

  The discharge path 55 is connected between the discharge inlet pipe 57 connected at one end to the cylinder block 37, the discharge outlet pipe 59 connected at one end to the discharge pipe 11, and the discharge inlet pipe 57 and the discharge outlet pipe 59. And an intermediate muffler 61.

JP-T 63-500878

  However, in the conventional configuration, by providing the intermediate muffler 61 having a large mass between the discharge inlet pipe 57 and the discharge outlet pipe 59 of the discharge path 55, the natural frequency of the discharge path 55 is reduced, and the hermetic compression is performed. Since the operation frequency of the machine is approached, the discharge inlet pipe 57 and the discharge outlet pipe 59 are liable to resonate due to vibration during operation and break easily, resulting in a problem of poor compression.

The present invention solves the above-mentioned conventional problems, and even if an intermediate muffler is provided between the discharge inlet pipe and the discharge outlet pipe of the discharge path, the natural frequency of the discharge path is prevented from being lowered, and hermetic compression is performed. An object of the present invention is to provide a hermetic compressor with high durability, which prevents breakage by avoiding resonance between the discharge inlet pipe and the discharge outlet pipe due to vibration during operation of the machine.

  In order to solve the above-described conventional problems, the hermetic compressor of the present invention has a discharge path with a discharge inlet pipe having one end connected to the cylinder head and a discharge pipe having one end communicating with the inside and outside of the sealed container. A discharge outlet pipe connected to the discharge outlet pipe and an intermediate muffler connected between the discharge inlet pipe and the discharge outlet pipe. The intermediate muffler is fixed to the cylinder block.

  This prevents a large mass of the intermediate muffler from being added to the discharge path, thereby preventing a decrease in the natural frequency of the discharge path and avoiding resonance between the discharge inlet pipe and the discharge outlet pipe due to vibration during operation of the hermetic compressor. Breakage can be prevented.

  The hermetic compressor of the present invention fixes an intermediate muffler connected between a discharge inlet pipe and a discharge outlet pipe to a cylinder block, so that the discharge inlet pipe and the discharge outlet are caused by vibration during operation of the hermetic compressor. Since resonance of the pipe can be avoided and breakage can be prevented, the durability of the hermetic compressor can be improved.

The longitudinal cross-sectional view seen from the side of the hermetic compressor in Embodiment 1 of the present invention Longitudinal sectional view seen from the front of the hermetic compressor in the same embodiment Cross-sectional view of hermetic compressor in the same embodiment Sectional drawing of the principal part seen from the AA direction of FIG. 3 in the embodiment Schematic diagram of a refrigeration apparatus in Embodiment 2 of the present invention Vertical section of a conventional hermetic compressor Cross-sectional view of a conventional hermetic compressor

  According to a first aspect of the present invention, an electric element and a compression element driven by the electric element are accommodated in a sealed container, and the compression element includes a cylinder block having a cylinder and a piston that reciprocates in the cylinder. A valve plate that seals the open end of the cylinder to form a discharge hole, a cylinder head that covers the valve plate to form a discharge space, and a refrigerant gas compressed by the compression element to the outside of the sealed container A discharge path that leads out, the discharge path having a discharge inlet pipe having one end connected to the cylinder head, a discharge outlet pipe having one end connected to a discharge pipe communicating with the inside and outside of the sealed container, An intermediate muffler connected between the discharge inlet pipe and the discharge outlet pipe, and the intermediate muffler is fixed to the cylinder block.

  This prevents a large mass of the intermediate muffler from being added to the discharge path, thus preventing a decrease in the natural frequency of the discharge path, and resonance between the discharge inlet pipe and the discharge outlet pipe due to vibration during operation of the hermetic compressor. Since this can be avoided and breakage can be prevented, the durability of the hermetic compressor can be improved.

  According to a second invention, in particular, in the first invention, the intermediate muffler is fixed to the cylinder block via a heat insulating material.

As a result, the heat of the high-temperature refrigerant gas in the intermediate muffler is prevented from being transferred from the intermediate muffler to the cylinder inner surface through the cylinder block, and the temperature rise on the cylinder inner surface is suppressed, and the cylinder interior in the intake stroke is suppressed. Therefore, in addition to the effects of the first invention, the volumetric efficiency of the hermetic compressor can be improved.

  In a third aspect of the invention, in particular, in the first or second aspect of the invention, the outer periphery of the side surface of the intermediate muffler is covered with a fastener, and the intermediate muffler is fixed by a fixing bolt.

  As a result, even if the length and shape of the discharge inlet pipe and the discharge outlet pipe vary, the position and angle of the fastener can be shifted and the intermediate muffler can be fixed to the cylinder block with the fixing bolt, and the intermediate muffler is fixed to the cylinder block. The degree of freedom increases, the intermediate muffler can be easily fixed to the cylinder block, and the productivity of the hermetic compressor is improved.

  In particular, according to a fourth aspect of the present invention, in any one of the first to third aspects, the inverter is driven at a plurality of operating frequencies.

  As a result, even in an inverter-driven hermetic compressor that operates at a frequency higher than the commercial power supply frequency, by fixing the intermediate muffler to the cylinder block, a reduction in the natural frequency of the discharge path is prevented, and the natural vibration of the discharge path Since the number can be maintained at a high frequency, resonance between the discharge inlet pipe and the discharge outlet pipe due to vibration during operation can be avoided and breakage can be prevented. In addition to the effects of the first to third inventions, sealing is also performed in the inverter drive. The durability of the mold compressor can be improved.

  5th invention has a refrigerant circuit which connected the compressor, the heat radiator, the decompression device, and the heat absorber cyclically | annularly by piping, The said compressor is used as the hermetic compressor of any one of 1st to 4th invention. This is a refrigeration apparatus.

  Accordingly, the durability of the refrigeration apparatus can be improved by mounting the hermetic compressor that prevents resonance between the discharge inlet pipe and the discharge outlet pipe of the discharge path due to vibration during operation, prevents breakage, and improves durability.

  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 as seen from the side of the hermetic compressor according to Embodiment 1 of the present invention, FIG. 2 is a longitudinal sectional view as seen from the front of the hermetic compressor according to the same embodiment, and FIG. FIG. 4 is a cross-sectional view of the hermetic compressor in the same embodiment, and FIG. 4 shows a cross-sectional view of the main part as seen from the AA direction of FIG. 3 in the same embodiment.

  1 to 4, the hermetic compressor in the first embodiment includes an upper container 102 and a lower container 104 formed by drawing a steel plate, and is welded in a sealed container 106 formed by welding. A compressor main body 114 including an electric element 110 and a compression element 112 driven by the electric element 110 is disposed.

  The compressor body 114 is elastically supported by a suspension spring 116. Further, in the sealed container 106, for example, a refrigerant gas 120 such as a hydrocarbon-based R600a having a low global warming potential is at a pressure equivalent to that of the low-pressure side of the refrigeration apparatus (not shown) and in a relatively low temperature state. In addition to being sealed, lubricating oil 122 is sealed at the bottom of the sealed container 106. A discharge pipe 124 and a suction pipe 126 communicating with the inside and outside of the sealed container 106 are fixed to the side surface of the lower container 104 of the sealed container 106 by welding, and are connected to the high-pressure side and the low-pressure side of the refrigeration apparatus, respectively.

  The compression element 112 includes a cylinder block 134 in which a cylinder 130 and a bearing 132 are integrally formed, a piston 136 that reciprocates in the cylinder 130, a crank that includes an eccentric shaft 140 and a main shaft 142 that is supported by the bearing 132. The shaft 144, the connecting means 146 for connecting the eccentric shaft 140 and the piston 136, the valve plate 150 for sealing the end face of the cylinder 130 opposite to the crankshaft 144, and the cylinder head 152 for covering the valve plate 150 And a discharge path 154 that connects the cylinder head 152 and the discharge pipe 124.

  The electric element 110 includes a DC brushless motor that includes a rotor 156 that is fixed to the main shaft 142 by press-fitting or the like, and a stator 158 that is disposed coaxially with the rotor 156 so as to surround the rotor 156. It is.

  The discharge path 154 includes a discharge inlet pipe 164 having one end connected to the cylinder head 152 by a muffler bolt 162, a discharge outlet pipe 166 having one end connected to the discharge pipe 124 and a plurality of arc-shaped bent portions for absorbing vibrations, The intermediate muffler 168 is connected between the discharge inlet pipe 164 and the discharge outlet pipe 166 by welding or the like.

  The intermediate muffler 168 is a cylindrical double-drawer-shaped pipe that is welded by fitting the openings of two single-drawer pipes that are drawn at one end and opened at the other end by drawing a steel plate. Are arranged substantially in parallel with the reciprocating direction of. A loop-shaped fastener 170 made of metal covering a part of the outer periphery of the side surface is wound around the outer periphery of the side surface of the intermediate muffler 168.

  Flat portions 172 and 174 are formed at both ends of the fastener 170, and a bolt hole is provided in the center of the flat portions 172 and 174.

  The fastener 170 makes a round around the outer periphery of the side surface of the intermediate muffler 168, and the flat portions 172 and 174 overlap each other. Between the flat portions 172 and 174 and the muffler fixing portion 182 formed on the end surface of the cylinder block 134 on the cylinder 130 side. In this case, a heat insulating washer 184 made of a heat insulating material such as ceramic is laid and fastened to the muffler fixing portion 182 together with the intermediate muffler 168 through the fixing bolt 180 in the bolt hole.

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

  When the electric element 110 is energized from an inverter power source (not shown), a current flows through the stator 158, a magnetic field is generated, and the rotor 156 fixed to the main shaft 142 rotates.

  The rotation of the rotor 156 causes the crankshaft 144 to rotate, and the piston 136 reciprocates in the cylinder 130 via the connecting means 146 rotatably attached to the eccentric shaft 140, so that the compression element 112 is predetermined. Perform the compression operation. The high-temperature refrigerant gas 120 compressed in the cylinder 130 is discharged from the cylinder head 152 through the discharge path 154 to the high pressure side of the refrigeration apparatus through the discharge pipe 124.

  Next, the operation and effect of fixing the intermediate muffler 168 to the muffler fixing portion 182 of the cylinder block 134 with the fastener 170 will be described.

The compressor body 114 vibrates greatly at the operating frequency because the piston 136 reciprocates in the cylinder 130 during operation. The compressor main body 114 is elastically supported by the suspension spring 116 so that the vibration is attenuated and not directly transmitted to the sealed container 106. Similarly, the discharge outlet pipe 166 of the discharge path 154 through which the high-temperature refrigerant gas 120 compressed by the compression element 112 is led out of the sealed container 106 is also provided with a plurality of elastic arc-shaped bent portions. Yes. The cylindrical intermediate muffler 168 connected between the discharge inlet pipe 164 and the discharge outlet pipe 166 of the discharge path 154 reduces the pressure pulsation of the refrigerant gas 120 and reduces the vibration of the discharge outlet pipe 166. Yes.

  In the present embodiment, the intermediate muffler 168 is arranged so that the longitudinal direction thereof is substantially parallel to the reciprocating direction of the piston 136. Thereby, the installation space of the intermediate muffler 168 of the muffler fixing portion 182 of the cylinder block 134 can be effectively utilized, and the muffler volume of the intermediate muffler 168 can be increased, so that the pressure pulsation of the refrigerant gas 120 can be further reduced. It is possible to reduce the vibration of the discharge outlet pipe 166 and the pipe vibration on the high-pressure side of the refrigeration apparatus.

  As described above, the intermediate muffler 168 has an effect of reducing the pressure pulsation of the refrigerant gas 120 and reducing the pipe vibration. However, since the mass is large, the natural frequency of the discharge passage 154 is reduced unless the cylinder block 134 is fixed. Since it approaches the operating frequency of the compressor, the discharge inlet pipe 164 and the discharge outlet pipe 166 are likely to resonate and break easily due to vibration during operation, and in the case of breakage, a compression failure may occur.

  Therefore, in the present embodiment, in order to avoid resonance between the discharge inlet pipe 164 and the discharge outlet pipe 166 during operation, the intermediate muffler 168 is covered with the fastener 170 and the outer periphery of the intermediate muffler 168 is fixed, and the cylinder block 134 is fixed to the muffler. It is fixed to the part 182 with fixing bolts 180. As a result, since the large mass of the intermediate muffler 168 is not added to the discharge path 154, the natural frequency of the discharge path 154 can be prevented from approaching the operating frequency, which is caused by vibration during operation of the hermetic compressor. Since resonance between the discharge inlet pipe 164 and the discharge outlet pipe 166 can be avoided and breakage can be prevented, the durability of the hermetic compressor can be improved.

  Further, by fixing the intermediate muffler 168 to the muffler fixing portion 182 of the cylinder block 134, the natural frequency of the discharge path 154 can be maintained at a high frequency, so that the inverter-driven hermetic compression that operates at a frequency higher than the commercial power supply frequency. Also in the machine, resonance between the discharge inlet pipe 164 and the discharge outlet pipe 166 due to vibration during operation can be avoided and breakage can be prevented, so that the durability of the hermetic compressor can be improved even in inverter driving.

  In the present embodiment, the fastener 170 is used as a fixing method of the intermediate muffler 168 and is fixed to the muffler fixing portion 182 of the cylinder block 134. By using the fastener 170, the position of the fastener 170 can be reduced even if the length and shape of the discharge inlet pipe 164 and the discharge outlet pipe 166 vary as compared with the case where the intermediate muffler 168 is integrally provided with a fastener by welding or the like. It can be fixed to the muffler fixing portion 182 of the cylinder block 134 with the fixing bolt 180 while shifting the angle. As a result, the degree of freedom when fixing the intermediate muffler 168 is increased, and the intermediate muffler 168 can be easily fixed to the muffler fixing portion 182 of the cylinder block 134, so that the productivity of the hermetic compressor can be improved.

  Next, the operation and effect of laying a heat insulating washer 184 made of a heat insulating material between the flat portions 172 and 174 of the fastener 170 and the muffler fixing portion 182 of the cylinder block 134 and fixing with the fixing bolt 180 will be described.

  In addition to the effect of reducing the pressure pulsation of the refrigerant gas 120, the intermediate muffler 168 functions to reduce the heat of the high-temperature refrigerant gas 120 in the intermediate muffler 168 by forming the intermediate muffler 168 separately from the cylinder block 134. There is a heat insulation effect that is not directly transmitted to the cylinder block 134 having 130.

However, when the intermediate muffler 168 is directly fixed to the muffler fixing portion 182 of the cylinder block 134 with the fastener 170, the heat of the high-temperature refrigerant gas 120 in the intermediate muffler 168 is transferred from the surface of the intermediate muffler 168 via the fastener 170 to the cylinder block. 134, the inner wall of the cylinder 130 is heated, the temperature of the low-temperature refrigerant gas 120 sucked in the suction stroke rises, and the volumetric efficiency decreases.

  Therefore, in the present embodiment, in order to make it difficult to transfer the heat transmitted to the fastener 170 to the cylinder block 134, a ceramic or the like is provided between the flat portions 172 and 174 of the fastener 170 and the muffler fixing portion 182 of the cylinder block 134. A heat insulating washer 184 made of a heat insulating material is laid and the intermediate muffler 168 is fixed with a fixing bolt 180.

  As a result, the heat transferred from the surface of the intermediate muffler 168 to the fastener 170 is blocked by the heat insulating washer 184, and the cylinder block 134 can be prevented from being heated. As a result, the temperature rise of the inner surface of the cylinder 130 can be suppressed, and the temperature rise of the low-temperature refrigerant gas 120 sucked into the cylinder 130 during the suction stroke can be prevented, thereby improving the volumetric efficiency of the hermetic compressor. it can.

  In the present embodiment, a heat insulating material is laid between the flat portions 172 and 174 of the fastener 170 and the muffler fixing portion of the cylinder block 134. Similarly, the outer periphery of the side surface of the intermediate muffler 168 and the fastener Even if a heat insulating material is sandwiched between them, the same effect can be obtained.

(Embodiment 2)
FIG. 5 is a schematic diagram showing the configuration of the refrigeration apparatus in Embodiment 2 of the present invention. Here, an outline of the basic configuration of the refrigeration apparatus will be described assuming that the hermetic compressor described in Embodiment 1 is mounted on the refrigerant circuit.

  In FIG. 5, the refrigeration apparatus includes a heat-insulating box having an opening on one side, a main body 202 having a door structure that opens and closes the opening, and a section that divides the inside of the main body 202 into an article storage space 204 and a machine room 206. A wall 208 and a refrigerant circuit 210 for cooling the inside of the storage space 204 are provided.

  The refrigerant circuit 210 has a configuration in which the hermetic compressor described in Embodiment 1 as the compressor 212, the radiator 214, the decompression device 216, and the heat absorber 218 are connected in a ring shape. And the heat absorber 218 is arrange | positioned in the storage space 204 which comprised the air blower (not shown). The cooling heat of the heat absorber 218 is agitated so as to circulate in the storage space 204 by a blower as indicated by an arrow, and the storage space 204 is cooled.

  By mounting the hermetic compressor according to the first embodiment of the present invention as the compressor 212 in the refrigeration apparatus described above, the compressor 212 includes the intermediate muffler 168 and the fastener 170 for fixing the muffler of the cylinder block 134. Since the large mass of the intermediate muffler 168 is not added to the discharge path 154 by being fixed to the portion 182 with the fixing bolt 180, it is possible to prevent the natural frequency of the discharge path 154 from being lowered. Thereby, since the natural frequency of the discharge path 154 does not approach the operating frequency of the hermetic compressor, resonance between the discharge inlet pipe 164 and the discharge outlet pipe 166 due to vibration during operation can be avoided and breakage can be prevented. Since the durability of the hermetic compressor can be improved, the durability of the refrigeration apparatus can also be improved.

  As described above, the hermetic compressor and the refrigeration apparatus according to the present invention can prevent a decrease in the natural frequency of the discharge path even if an intermediate muffler is provided between the discharge inlet pipe and the discharge outlet pipe of the discharge path. In addition, it is possible to prevent resonance between the inlet / outlet pipe and the outlet / outlet pipe due to vibration during operation of the hermetic compressor, prevent breakage, and improve durability, so that it is not limited to household use such as electric refrigerators or air conditioners, but for business use It can be widely applied to refrigeration equipment such as showcases and vending machines.

106 Sealed container 110 Electric element 112 Compression element 120 Refrigerant gas 124 Discharge pipe 130 Cylinder 134 Cylinder block 136 Piston 150 Valve plate 152 Cylinder head 154 Discharge path 164 Discharge inlet pipe 166 Discharge outlet pipe 168 Intermediate muffler 170 Fastener 180 Fixing bolt 184 Thermal insulation Washer 210 Refrigerant circuit 212 Compressor 214 Radiator 216 Pressure reducing device 218 Heat absorber

Claims (5)

An electric element and a compression element driven by the electric element are accommodated in the sealed container,
The compression element includes a cylinder block having a cylinder, a piston that reciprocates in the cylinder, a valve plate that seals an opening end of the cylinder to form a discharge hole, and a lid that covers the valve plate to form a discharge space. A cylinder head, and a discharge path for leading the refrigerant gas compressed by the compression element to the outside of the sealed container,
The discharge path includes a discharge inlet pipe connected at one end to the cylinder head, a discharge outlet pipe connected at one end to a discharge pipe communicating with the inside and outside of the sealed container, the discharge inlet pipe, and the discharge outlet pipe. And an intermediate muffler connected between
A hermetic compressor in which the intermediate muffler is fixed to the cylinder block. The hermetic compressor according to claim 1, wherein the intermediate muffler is fixed to the cylinder block via a heat insulating material. The hermetic compressor according to claim 1 or 2, wherein an outer periphery of a side surface of the intermediate muffler is covered with a fastener, and the intermediate muffler is fixed by a fixing bolt. The hermetic compressor according to any one of claims 1 to 3, which is inverter-driven at a plurality of operating frequencies. 5. A refrigeration apparatus having a refrigerant circuit in which a compressor, a radiator, a decompression device, and a heat absorber are connected in an annular shape by piping, and the compressor is the hermetic compressor according to claim 1. .

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