JP2015025390A - Hermetic type compressor and freezer using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic type compressor which is highly efficient, which has low noise and excellent startability by preventing a lubricating oil contained in a refrigerant gas from staying in an auxiliary discharge chamber connected to a discharge chamber.SOLUTION: A hermetic type compressor includes an auxiliary discharge chamber 152 connected to a discharge chamber 133 by a communication pipe 150, and a bottom surface 151 of the auxiliary discharge chamber 152 is arranged at a position higher than a bottom surface 138 of the discharge chamber 133. Thereby, flowing of a lubricating oil into the auxiliary discharge chamber 152 and staying there is suppressed, and decrease of discharge space can be prevented. Thus, efficiency is improved, noise is reduced and startability can be improved.

Description

  The present invention relates to a hermetic compressor and a refrigeration apparatus using the same.

  Conventionally, some hermetic compressors have an auxiliary discharge chamber in the discharge chamber for the purpose of reducing refrigerant gas discharge pulsation (see, for example, Patent Document 1).

  The conventional hermetic compressor will be described below with reference to the drawings.

  FIG. 8 is a cross-sectional view of a conventional hermetic compressor described in Patent Document 1, and FIG. 9 is a schematic diagram of a discharge portion of the conventional hermetic compressor described in the same document.

  8 and 9, the sealed container 1 includes a discharge pipe 16 and a suction pipe 18 connected to a cooling system (not shown), respectively, and stores lubricating oil 19 at the bottom, and the stator 2 and the rotor 3. And the compression element 23 driven by the electric element 21, and the inside is filled with the refrigerant gas.

  Next, the main configuration of the compression element 23 will be described.

  The cylinder block 25 includes a substantially cylindrical compression chamber 5 and a bearing portion 27. The valve plate 8 includes a discharge valve device 10 and closes the end of the compression chamber 5. The head 11 covers the valve plate 8 to form a discharge chamber 13. One end of the suction muffler 14 opens into the sealed container 1 and the other end communicates with the compression chamber 5.

  The discharge chamber 13 is provided with a discharge muffler 15 and an auxiliary discharge chamber 17, and the auxiliary discharge chamber 17 is connected by a communication pipe 33. The shaft 4 has a main shaft portion 29 and an eccentric shaft portion 31, is supported by a bearing portion 27 of the cylinder block 25 and is press-fitted and fixed to the rotor 3.

  The piston 6 is inserted into the compression chamber 5 so as to be slidable back and forth, and is connected to the eccentric shaft portion 31 of the shaft 4 by a connecting rod 7.

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

  When electricity is supplied to the electric element 21, the rotor 3 rotates and the shaft 4 is driven to rotate. At this time, the eccentric rotational movement of the eccentric shaft portion 31 of the shaft 4 is transmitted to the piston 6 through the connecting rod 7, so that the piston 6 reciprocates in the compression chamber 5.

  As the piston 6 reciprocates, the refrigerant gas in the hermetic container 1 is drawn into the compression chamber 5 from the suction muffler 14, and low-pressure refrigerant gas passes through the suction pipe 18 from the cooling system (not shown). It flows into the sealed container 1.

  The refrigerant gas sucked into the compression chamber 5 is compressed by the reciprocating motion of the piston 6 and discharged from the discharge valve device 10 of the valve plate 8 to the discharge chamber 13.

The high-pressure refrigerant gas discharged to the discharge chamber 13 is once opened to the discharge muffler 15 and then discharged to the cooling system (not shown) through the discharge pipe 16. Further, the discharge pulsation of the refrigerant gas due to the repeated compression generated in the discharge chamber 13 and the pipe connected thereto can be dissipated by the auxiliary discharge chamber 17 connected to the discharge chamber 13 by the communication pipe 33, thereby the discharge chamber. 13 and the discharge pulsation of the refrigerant gas generated in the pipe line can be reduced.

  By reducing the discharge pulsation of the refrigerant gas, the overcompression of the internal pressure of the compression chamber 5 and the open / close delay of the discharge valve device 10 and the intake valve (not shown) are improved to reduce the input, thereby improving the efficiency of the hermetic compressor. In addition to being able to improve, it is possible to reduce the cooling system noise by reducing the discharge pulsation of the refrigerant gas. Moreover, the startability is improved by reducing the pressure increase in the compression chamber at the time of startup.

JP-A-53-20108

  However, in the conventional configuration, since the auxiliary discharge chamber 17 is disposed below the discharge chamber 13, the lubricating oil contained in the refrigerant gas discharged from the compression chamber 5 to the discharge chamber 13 is gradually added to the auxiliary discharge chamber. Accordingly, the volume of the auxiliary discharge chamber 17 is reduced, and there is a problem that a sufficient effect of reducing the discharge pulsation of the refrigerant gas cannot be obtained during use.

  The present invention solves the above-described conventional problems, and provides a hermetic compressor that has high efficiency, low noise, and excellent startability by preventing lubricating oil from staying in an auxiliary discharge chamber.

  In order to solve the conventional problems, the hermetic compressor of the present invention is such that the position of the bottom surface of the auxiliary discharge chamber is higher than the bottom surface of the discharge chamber.

  As a result, the lubricant contained in the refrigerant gas can be prevented from accumulating in the auxiliary discharge chamber and the volume of the auxiliary discharge chamber can be prevented from being reduced. It is possible to reduce the noise and reduce the noise, and it is possible to improve the startability by reducing the pressure increase in the compression chamber at the time of starting.

  The present invention can suppress the accumulation of lubricating oil in the auxiliary discharge chamber, so that it is possible to provide a hermetic compressor with high efficiency, low noise, and excellent startability.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. The longitudinal cross-sectional view seen from the auxiliary discharge chamber side of the hermetic compressor in the first embodiment Top sectional view of the hermetic compressor in the first embodiment Side surface sectional drawing of the hermetic compressor in Embodiment 1 The principal part expanded fragmentary sectional view in Embodiment 1 Vertical sectional view of a hermetic compressor according to Embodiment 2 of the present invention Schematic diagram of a refrigeration apparatus in Embodiment 3 of the present invention Vertical section of a conventional hermetic compressor Schematic of the discharge part of a conventional hermetic compressor

  According to a first aspect of the present invention, lubricating oil is stored in an airtight container, and an electric element having a stator and a rotor and a compression element driven by the electric element are accommodated, and the compression element forms a compression chamber. A cylinder block that reciprocates, a piston that reciprocates in the compression chamber, a valve plate that seals an end surface of the cylinder block and includes a discharge valve device on the non-compression chamber side, and a discharge chamber that houses the discharge valve device. A head formed and an auxiliary discharge chamber connected to the discharge chamber by a discharge communication passage are provided, and the position of the bottom surface of the auxiliary discharge chamber is higher than the bottom surface of the discharge chamber.

  This prevents the lubricant contained in the refrigerant gas from accumulating in the auxiliary discharge chamber and prevents the volume of the auxiliary discharge chamber from decreasing, thereby reducing the discharge pulsation of the refrigerant gas sufficiently and reducing the input. Noise can be reduced, and startability can be improved by reducing the pressure increase in the compression chamber during startup. As a result, a hermetic compressor having high efficiency, low noise and excellent startability can be provided.

  In the second aspect of the invention, in particular, the bottom surface of the auxiliary discharge chamber of the first aspect of the invention is arranged so as to be inclined so that the communication pipe side is lowered.

  As a result, even if lubricating oil enters the auxiliary discharge chamber, the bottom surface of the auxiliary discharge chamber is inclined toward the communication pipe side, so that the lubricating oil is discharged without accumulating in the auxiliary discharge chamber, and the volume of the auxiliary discharge chamber is increased. It can be prevented from decreasing. Accordingly, it is possible to reduce the discharge pulsation of the sufficient refrigerant gas, reduce the input, and reduce the noise. Moreover, since the pressure rise in the compression chamber at the time of starting can be reduced, the startability can be improved. As a result, a hermetic compressor with high efficiency, low noise, and excellent startability can be provided.

  In the third invention, in particular, the communication pipe of the first invention is connected to the bottom surface side of the auxiliary discharge chamber.

  Thereby, even if the lubricating oil enters the auxiliary discharge chamber, the lubricating oil is discharged from the communication pipe without accumulating in the auxiliary discharge chamber, and the volume of the auxiliary discharge chamber can be prevented from decreasing. Accordingly, it is possible to reduce the discharge pulsation of the sufficient refrigerant gas, reduce the input, and reduce the noise. Moreover, since the pressure rise in the compression chamber at the time of starting can be reduced, the startability can be improved. As a result, a hermetic compressor with high efficiency, low noise, and excellent startability can be provided.

  A fourth invention is a refrigeration apparatus having a refrigerant circuit in which the hermetic compressor according to any one of the first to third inventions, a radiator, a pressure reducing device, and a heat absorber are connected in a ring shape by a pipe. is there.

  As a result, the power consumption of the refrigeration system can be reduced by mounting the hermetic compressor with high efficiency, low noise and excellent startability, and low noise and excellent startability can be realized.

  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)
FIG. 1 is a longitudinal sectional view of a hermetic compressor in Embodiment 1 of the present invention, FIG. 2 is a longitudinal sectional view of the hermetic compressor in the same embodiment as viewed from the auxiliary discharge chamber side, and FIG. 4 is a top sectional view of the hermetic compressor in the same embodiment, FIG. 4 is a side sectional view of the hermetic compressor in the same embodiment, and FIG. 5 is an enlarged view of a main part of the first embodiment of FIG. It is sectional drawing.

1 to 5, the sealed container 101 includes a discharge pipe 135 and a suction pipe 137 that are connected to a cooling system (not shown), and stores a lubricating oil 106 at the bottom, and a stator 146 and a rotor 140. And the compression element 104 driven by the electric element 102, and the inside is filled with the refrigerant gas.

  Next, the main configuration of the compression element 104 will be described.

  A cylinder block 122 made of cast iron (for example, FC 200) includes a substantially cylindrical compression chamber 120 and a bearing portion 126. The valve plate 127 includes a discharge valve device (not shown) and closes the compression chamber 120. As shown in FIG. 5, the head 131 covers the valve plate 127 and forms a discharge chamber 133. One end of the suction muffler 136 opens into the sealed container 101, and the other end communicates with the compression chamber 120.

  The shaft 116 has a main shaft portion 110 and an eccentric shaft portion 114. The main shaft portion 110 is pivotally supported by a bearing portion 126 of the cylinder block 122, and the rotor 140 is press-fitted and fixed.

  The piston 128 is inserted into the compression chamber 120 so as to be slidable in a reciprocating manner, and is connected to the eccentric shaft portion 114 and the connecting rod 130. The discharge chamber 133 constituted by the head 131 and the valve plate 127 includes a discharge muffler 132 that communicates with the discharge communication pipe 134 and forms an expansion space in a part of the discharge communication pipe 134. The discharge muffler 132 is connected through a discharge pipe 139 to a discharge pipe 135 that penetrates the sealed container.

  An auxiliary discharge chamber 152 is connected to the discharge chamber 133 through a communication pipe 150. The bottom of the auxiliary discharge chamber 152 is located higher than the bottom of the discharge chamber 133. The bottom surface 151 of the auxiliary discharge chamber 152 is disposed so as to be inclined so that the communication pipe 150 side is lowered. Further, the auxiliary discharge chamber 152 and the communication pipe 150 are connected at a location near the bottom surface 151 of the auxiliary discharge chamber 152.

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

  When electricity is supplied to the electric element 102, the rotor 140 rotates and the shaft 116 is driven to rotate. At this time, the eccentric rotational movement of the eccentric shaft portion 114 is transmitted to the piston 128 via the connecting rod 130, so that the piston 128 reciprocates in the compression chamber 120.

  As the piston 128 reciprocates, the refrigerant gas in the hermetic container 101 is drawn into the compression chamber 120 from the suction muffler 136, and the low-pressure refrigerant gas passes from the cooling system (not shown) through the suction pipe 137. It flows into the sealed container 101.

  The refrigerant gas sucked into the compression chamber 120 from the suction muffler 136 is compressed by the reciprocating motion of the piston 128 and discharged from the discharge valve device (not shown) of the valve plate 127 to the discharge chamber 133. The high-pressure refrigerant gas discharged into the discharge chamber 133 passes through the discharge communication pipe 134 and is temporarily opened to the discharge muffler 132 in the middle of the discharge communication pipe 134, and then is discharged from the discharge pipe 135 through the discharge pipe 135 to the cooling system ( (Not shown).

  Further, the auxiliary discharge chamber 152 is connected to the discharge chamber 133 through the communication pipe 150, and the volume of the discharge space is the combined volume of the discharge chamber 133 and the auxiliary discharge chamber 152. Thereby, even if the refrigerant gas suddenly flows into the discharge chamber 133 from the compression chamber 120 via the valve plate 127, an increase in discharge pulsation in the discharge chamber can be suppressed. As a result, the overcompression in the compression chamber 120 is reduced, the input is lowered, and the efficiency of the hermetic compressor can be improved.

  Here, since the discharge chamber 133 and the auxiliary discharge chamber 152 are connected by the communication pipe 150, the lubricating oil particles contained in the refrigerant gas discharged to the discharge chamber 133 drift to the auxiliary discharge chamber 152, It tries to collect in the auxiliary discharge chamber 152. However, since the bottom surface 151 of the auxiliary discharge chamber 152 is configured to be higher than the bottom surface 138 of the discharge chamber 133, the lubricating oil hardly flows from the discharge chamber 133 into the auxiliary discharge chamber 152. Further, since the bottom surface 151 of the auxiliary discharge chamber 152 is inclined so that the communication pipe 150 side is lowered, the auxiliary discharge chamber 152 does not stay in the auxiliary discharge chamber 152, and the lubricating oil flows into the communication pipe 150 by its own weight, and the discharge chamber 133. Go back to.

  Further, since the communication pipe 150 is disposed on the bottom surface 151 side of the auxiliary discharge chamber 152, it is possible to prevent the lubricating oil from staying on the bottom surface 151 of the auxiliary discharge chamber 152. Thereby, a decrease in the volume of the auxiliary discharge chamber 152 due to the accumulation of lubricating oil can be suppressed.

(Embodiment 2)
FIG. 6 shows the refrigerant compressor according to the second embodiment. In the first embodiment, the auxiliary discharge chamber 152 is configured as a tank separately from the cylinder block 122. In the second embodiment, FIG. As shown in FIG. 6, the auxiliary discharge chamber 252 is integrally provided in a part of the cylinder block 222 by casting or the like, so that a separate tank is not required and the configuration is simplified, 1 can be obtained.

  In the second embodiment, the communication hole 250 that connects the discharge chamber 233 and the auxiliary discharge chamber 252 provided in the valve plate 227 functions as the communication tube 150.

  As described above, according to each embodiment, it is possible to suppress the retention of lubricating oil in the auxiliary discharge chambers 152 and 252 and to suppress a decrease in the volume of the auxiliary discharge chambers 152 and 252. Thus, a sufficient refrigerant gas discharge pulsation reduction effect can be stably obtained. As a result, it is possible to stably prevent an increase in the pressure in the compression chamber 120 at the time of start-up with low noise and low input, and a highly efficient and low-noise hermetic compressor with excellent startability. Can be provided.

(Embodiment 3)
FIG. 7 is a schematic diagram showing the configuration of the refrigeration apparatus in Embodiment 3 of the present invention. This refrigeration apparatus is equipped with the hermetic compressor described in the first or second embodiment, and an outline of the basic configuration of the refrigeration apparatus will be described.

  In FIG. 7, the refrigeration apparatus includes a heat-insulating box having an opening on one side, a main body 301 having a door structure that opens and closes the opening, and a compartment that divides the inside of the main body 301 into an article storage space 303 and a machine room 305. A wall 307 and a refrigerant circuit 309 for cooling the inside of the storage space 303 are provided.

  The refrigerant circuit 309 has a configuration in which the hermetic compressor described in the first or second embodiment, the radiator 313, the decompression device 315, and the heat absorber 317 are connected in a ring shape as the compressor 311. Yes. And the heat absorber 317 is arrange | positioned in the storage space 303 which comprised the air blower (not shown). The cooling heat of the heat absorber 317 is agitated so as to circulate in the storage space 303 by a blower as indicated by an arrow.

  The refrigeration apparatus configured as described above is equipped with the hermetic compressor according to Embodiment 1 or 2 of the present invention as the compressor 311, thereby reducing input of the compressor 311, reducing noise, and improving startability. Therefore, the input of the refrigeration apparatus can be reduced, noise can be reduced, and excellent startability can be realized.

  As described above, the hermetic compressor and the refrigeration apparatus according to the present invention suppress the retention of lubricating oil in the auxiliary discharge chamber of the hermetic compressor, thereby reducing input, reducing noise, and excellent startability. And can be widely applied to refrigeration apparatuses such as commercial showcases and vending machines, not limited to home use such as electric refrigerators or air conditioners.

DESCRIPTION OF SYMBOLS 101 Sealed container 102 Electric element 104 Compression element 106 Lubricating oil 120 Compression chamber 122, 222 Cylinder block 127, 227 Valve plate 128 Piston 131 Head 133, 233 Discharge chamber 134 Discharge communication pipe 138 Bottom surface 140 Rotor 146 Stator 150 Communication pipe 151 Bottom surface 152, 252 Auxiliary discharge chamber 250 Communication hole

Claims (4)

The lubricating oil is stored in an airtight container, and an electric element including a stator and a rotor and a compression element driven by the electric element are accommodated, the compression element forming a compression chamber, A piston that reciprocates in a compression chamber; a valve plate that seals an end surface of the cylinder block and includes a discharge valve device on the side opposite to the compression chamber; a head that forms a discharge chamber that houses the discharge valve device; A hermetically sealed type comprising a discharge pipe connected to the discharge chamber, and an auxiliary discharge chamber connected to the discharge chamber by a communication pipe, wherein the position of the bottom surface of the auxiliary discharge chamber is higher than the bottom surface of the discharge chamber Compressor. 2. The hermetic compressor according to claim 1, wherein a bottom surface of the auxiliary discharge chamber is arranged to be inclined so that the communication pipe side is lowered. The hermetic compressor according to claim 1, wherein the communication pipe is connected to a bottom surface side of the auxiliary discharge chamber. A refrigeration apparatus having a refrigerant circuit in which the hermetic compressor, the radiator, the decompressor, and the heat absorber according to any one of claims 1 to 3 are connected in a ring shape.