JP2007092601A - Hermetic compressor and cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact hermetic compressor making the width of the outer contour small while maintaining a low noise level. <P>SOLUTION: Since a hermetic vessel 102 is formed to keep curvature of a surface near a delivery muffler is larger than curvature of an opposite surface 178 thereof, stiffness of the surface near the delivery muffler is increased, resonance of the hermetic vessel 102 due to radiation noise generated from the delivery muffler 116 can be prevented and size of the outer contour of the hermetic compressor can be kept small while maintaining noise level. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  Conventionally, this type of hermetic compressor includes a hermetic container in which the curvature of the surface near the discharge muffler and the curvature of the opposite surface are the same (see, for example, Patent Document 1).

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

  FIG. 5 is a front sectional view of a conventional hermetic compressor described in Patent Document 1, and FIG. 6 is a side sectional view of the conventional hermetic compressor described in Patent Document 1. FIG. 7 is a schematic view when the conventional hermetic compressor described in Patent Document 1 is mounted on a cooling device.

  5 and 6, an electric element 2 and a compression element 3 that is rotationally driven by the electric element 2 are accommodated in the sealed container 1, and oil 4 is stored at the bottom. The electric element 2 and the compression element 3 are assembled together and elastically held in the sealed container 1 by a plurality of support springs 5.

  The block 10 constituting the compression element 3 is formed with a discharge muffler 13 and a suction muffler 14 on both sides of the cylinder 11 between the cylinder 11 and the cylinder 11, and a piston 15 is fitted in the cylinder 11 in a reciprocating manner. A bearing 16 is fixed to the upper part of the block 10.

  A cylinder head 22 having a discharge chamber 21 on the side opposite to the cylinder 11 sandwiching the intake / exhaust valve 20 is disposed at the open end of the cylinder 11.

  The discharge chamber 21 communicates with the discharge muffler 13, and the discharge muffler 13 and the outside of the sealed container 1 are connected by a discharge path 23. The suction muffler 14 is provided with a suction muffler pipe 24 at the top.

  The shaft 25 includes a main shaft portion 26 supported by the bearing 16 and an eccentric portion 27 formed below the main shaft portion 26, and the eccentric portion 27 and the piston 15 are connected by a connecting rod 28.

  The electric element 2 includes a stator 31 fixed above the block 10 and provided with a winding 30 and a rotor 32 fixed to the main shaft portion 26 by shrink fitting or the like.

  In the sealed container 1, a surface 35 near the discharge muffler facing the discharge muffler 13 and a surface 36 near the suction muffler facing the suction muffler 14 are formed with the same curvature.

  In FIG. 7, the cooling device 41 includes a cooling system 42, an interior 43, an engine room 45 opened on the back surface 44 side of the cooling device 41, an interior 43, and a partition wall 46 that partitions the engine room 45.

  The conventional hermetic compressor 47 shown in FIGS. 5 and 6 is installed in the engine room 45 with the surface 35 near the discharge muffler facing the inside of the engine room 45.

  The cooling system 42 is connected to a hermetic compressor 47 to form a refrigeration cycle, and a refrigerant (not shown) is enclosed therein.

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

  When the electric element 2 is energized, the rotor 32 rotates and the shaft 25 rotates accordingly, and the movement of the eccentric portion 27 is transmitted to the piston 15 via the connecting rod 28, so that the piston 15 is moved inside the cylinder 11. A reciprocating motion is performed, and the compression element 3 performs a predetermined compression operation.

  A refrigerant gas (not shown) in the hermetic container 1 is sucked from the tip of the suction muffler pipe 24 during the suction process of the compression element 3 and supplied to the cylinder 11 through the suction muffler 14. At this time, pressure pulsation blown back toward the suction muffler 14 occurs due to re-expansion of the refrigerant gas remaining in the cylinder 11, but is attenuated in the suction muffler 14 to prevent the pressure pulsation from being transmitted directly into the sealed container 1. . The refrigerant gas supplied into the cylinder 11 is compressed in the cylinder 11 by the piston 15 during the compression process. The compressed refrigerant gas is discharged from the intake / exhaust valve 20 to the discharge chamber 21, and the pressure pulsation is attenuated while flowing in the order of the discharge muffler 13 and the discharge path 23, and is discharged outside the sealed container 1.

During cooling, the cooling device 41 energizes the hermetic compressor 47 and circulates the refrigerant in the cooling system 42 to cool the interior 43.
JP 2004-293463 A

  However, in the above conventional configuration, when the hermetic compressor 47 is installed in the engine room 45, the hermetic container 1 is wide so that the hermetic container 1 does not protrude from the outside of the engine room 45 to the back 44 side. In order to install the compressor 47 inside the engine room 45, the partition wall 46 had to be designed so as to project toward the interior 43 side. As a result, the engine room 45 cannot be saved in space, and the volume of the interior 43 is reduced.

  The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a narrow hermetic compressor including a small-sized hermetic container.

  In order to solve the above conventional problems, the hermetic compressor according to the present invention is such that the hermetic container is formed such that the curvature of the surface near the discharge muffler is larger than the curvature of the opposite surface, and the curvature of the surface near the discharge muffler. Because of its large size and high rigidity, resonance of the sealed container due to the radiated sound generated from the discharge muffler can be prevented, and the size of the sealed container can be suppressed while maintaining a low noise level.

  The hermetic compressor of the present invention can provide a hermetic compressor having a narrow width by including a hermetic container having a small size.

  The invention according to claim 1 includes a compression element that compresses refrigerant gas and a sealed container that accommodates the compression element. The compression element includes a block that forms a cylinder, a piston that reciprocates in the cylinder, and the cylinder. An intake / exhaust valve disposed at the opening end of the cylinder, a cylinder head disposed on the side opposite to the cylinder sandwiching the intake / exhaust valve and having a discharge chamber, a discharge muffler formed in the block and communicating with the discharge chamber, and the discharge A discharge path that communicates between the muffler and the outside of the sealed container, and the closed container is formed so that the curvature of the surface in the vicinity of the discharge muffler is larger than the curvature of the opposite surface, and the curvature of the surface in the vicinity of the discharge muffler Because of its large size and high rigidity, it can prevent resonance of the sealed container due to the radiated sound generated from the discharge muffler, and the size of the sealed container can be reduced while maintaining a low noise level. It is possible to provide a narrow hermetic compressor in width because of its use of suppression is even.

  The invention according to claim 2 is the invention according to claim 1, wherein a resin suction muffler is disposed in the vicinity of the cylinder head. The space near the cylinder head has a large space volume in the hermetic container, and the volume of the suction muffler. Since the pressure pulsation blown back to the suction muffler by the re-expansion of the refrigerant gas in the suction process can be attenuated in the suction process, the pressure pulsation can be prevented from being transmitted directly into the sealed container. Since the rate is small, heat is not easily transmitted from the cylinder head, and the refrigerant gas in the suction muffler has an effect of being heated. In addition to the effect of the invention of claim 1, the noise level is further reduced and the efficiency is increased. Can be planned.

  The invention according to claim 3 is the invention according to claim 1, wherein the discharge path is disposed in the discharge muffler side space in the sealed container, and the surface near the discharge muffler has a large curvature and high rigidity. In addition to the effect of the first aspect of the present invention, the noise level can be further reduced since the resonance of the surface near the discharge muffler can be prevented by the radiated sound generated from the path.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the sealed container communicates the surface near the discharge muffler and the opposite surface thereof with a connection surface having a larger curvature than the surface near the outlet muffler, and discharges the discharge container. Since the discharge pipe to which the path is connected is fixed to the connection surface and the discharge pipe is fixed to the connection surface having a large curvature and high rigidity, even if the vibration of the compression element is transmitted to the discharge pipe through the discharge path In addition to the effect of the first aspect of the present invention, the noise level can be further reduced because the connection surface can be prevented from resonating.

  The invention according to claim 5 has an engine room, and the hermetic compressor according to any one of claims 1 to 4 is housed in the engine room, and the hermetic compressor is an airtight container. The cooling device is arranged with the surface near the discharge muffler facing the inside of the engine room, and the hermetic compressor has an opposing surface on the outside of the engine room whose curvature is smaller than the curvature of the surface near the discharge muffler. Since it can be installed on the outside of the engine room along the back of the cooling device, it can be designed to project the partition wall to the engine room side, saving the engine room space, The internal volume can be expanded relatively.

  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 front cross-sectional view of a hermetic compressor according to Embodiment 1 of the present invention, FIG. 2 is a side cross-sectional view of the hermetic compressor according to the same embodiment, and FIG. 3 is a hermetic compressor according to the same embodiment. FIG.

  1, 2, and 3, an electric element 104 and a compression element 106 that is rotationally driven by the electric element 104 are housed in an airtight container 102, and oil 108 is stored at the bottom. The electric element 104 and the compression element 106 are assembled together and elastically held by a plurality of support springs 110.

  Next, the main configuration of the compression element 106 will be described.

  The block 112 cast from a casting has a cylindrical cylinder 114 and a discharge muffler 116 integrally formed in parallel with the cylinder 114. A bearing 118 is fixed to the upper portion of the block 112. The piston 120 is fitted in the cylinder 114 so as to reciprocate.

  The intake / exhaust valve 130 is disposed at the opening end of the cylinder 114, and a cylinder head 134 having a discharge chamber 132 is disposed on the opposite side of the cylinder 114 across the intake / exhaust valve 130.

  At the opening end of the discharge muffler 116, a hemispherical muffler cover 136 formed by iron plate drawing is fixed by a muffler bolt 138 to form a discharge muffler chamber 140.

  The discharge muffler chamber 140 communicates with the discharge chamber 132, and the discharge muffler chamber 140 and the outside of the sealed container 102 are connected by a discharge path 142.

  The discharge path 142 formed by the steel pipe is disposed so as to follow the discharge muffler side space 144 secured between the inner wall surface of the sealed container 102 and the discharge muffler 116.

  The suction muffler 150 made of resin is formed so that the suction muffler front surface portion 152 facing the sealed container 102 follows the curvature of the sealed container 102 and is disposed in the space above the cylinder head 134. A suction port 154 is formed in the front surface portion 152 of the suction muffler.

  In the shaft 160, a main shaft portion 162 is pivotally supported by a bearing 118, and an eccentric portion 164 is formed therebelow, and the eccentric portion 164 and the piston 120 are connected by a connecting rod 166.

  In the sealed container 102, an upper container 170 and a lower container 172 formed by drawing a steel plate are hermetically coupled by welding or the like at a joint point 174.

  The curvature of the surface 176 near the discharge muffler opposed to the discharge muffler 116 of the sealed container 102 is formed to be larger than the curvature of the facing surface 178. Further, the surface 180 near the discharge path facing the discharge path 142 and the surface 182 near the suction muffler facing the suction muffler 150 are formed with substantially the same curvature as the surface 176 near the discharge muffler.

  Furthermore, the surface 180 near the discharge path and the opposing surface 178 are connected by a connection surface a184 that is larger in curvature than the surface 176 near the discharge muffler. The surface 182 in the vicinity of the suction muffler and the opposing surface 178 are connected by a connection surface b186 that is larger in curvature than the surface 176 in the vicinity of the discharge muffler.

  A discharge pipe 190 that communicates between the inside and outside of the sealed container 102 is fixed to the connection surface a184 by welding, and a suction pipe 192 that communicates between the inside and outside of the sealed container 102 is fixed to the connection surface b186 by welding. A discharge path 142 formed of a thin steel pipe communicates with the discharge muffler 116 and the discharge pipe 190 and is fixed to the discharge pipe 190 by welding.

  The electric element 104 includes a stator 196 fixed above the block 112 and provided with a winding 194, and a rotor 198 fixed to the main shaft portion 162 by shrink fitting or the like.

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

  When the electric element 104 is energized, the rotor 198 is rotated and the shaft 160 is rotated accordingly, and the movement of the eccentric portion 164 is transmitted to the piston 120 via the connecting rod 166, so that the piston 120 is moved in the cylinder 114. A reciprocating motion is performed, and the compression element 106 performs a predetermined compression operation.

  Refrigerant gas (not shown) in the sealed container 102 is sucked from the suction port 154 and supplied to the cylinder 114 through the suction muffler 150 during the suction process of the compression element 106. At this time, pressure pulsation that blows back toward the suction muffler 150 occurs due to re-expansion of the refrigerant gas remaining in the cylinder 114.

  Here, since the suction muffler 150 is disposed in a wide space above the cylinder head 134 and the suction muffler front portion 152 is formed so as to follow the curvature of the sealed container 102, a large volume of the suction muffler 150 can be secured. For this reason, the pressure pulsation is greatly attenuated in the suction muffler 150 and the energy of the pressure pulsation transmitted to the sealed container 102 can be greatly reduced, the radiated sound from the sealed container 102 can be suppressed, and the noise can be reduced.

  Further, since the suction muffler 150 is formed of a resin having a low thermal conductivity, it is difficult for heat from the cylinder head 134 to be transmitted and the refrigerant gas in the suction muffler 150 can be prevented from being heated. As a result, the suction efficiency is increased and the efficiency can be increased.

  Next, the refrigerant gas supplied to the cylinder 114 is compressed in the cylinder by the piston 120 during the compression process of the compression element 106. The refrigerant gas compressed in the cylinder 114 passes through the intake / exhaust valve 130 and is discharged to the discharge chamber 132. The refrigerant gas flows in the order of the discharge muffler chamber 140 and the discharge path 142, and the pressure pulsation of the refrigerant gas is gradually attenuated and passes through the discharge pipe 190. Supplied to a cooling system (not shown).

  At this time, the refrigerant gas compressed to a high pressure includes a pressure pulsation component at a high energy level and its harmonic component generated when the refrigerant gas is intermittently compressed to a high pressure. Therefore, when the refrigerant gas passes through the discharge muffler chamber 140, these pressure pulsation components and harmonic components are released as transmitted sound from the muffler cover 136.

  Further, the muffler cover 136 is vibrated by a pressure pulsation component having a high energy level or its harmonic component, thereby generating a resonance sound.

  Further, the refrigerant gas is supplied to the cooling system (not shown) through the discharge path 142, but the pressure pulsation component of the refrigerant gas is not completely removed in the discharge muffler chamber 140. The discharge path 142 is formed of a thin steel pipe, and the remaining pressure pulsation component and harmonic component are easily emitted as transmitted sound, and the discharge path 142 is vibrated by the pressure pulsation component and its harmonic component. Resonance sound is generated.

  However, in the present embodiment, the curvature of the surface 176 near the discharge muffler of the sealed container 102 is formed to be larger than the curvature of the opposing surface 178, and the curvature of the surface 180 near the discharge path is the surface near the discharge muffler. Since it is formed with a large curvature close to 176, the rigidity is high, and it is difficult to resonate with noise radiated from the discharge muffler chamber 140 and the discharge path 142. As a result, noise emitted from the discharge muffler chamber 140, the discharge path 142, and the discharge pipe 190 can be effectively insulated.

  On the other hand, the closed container 102 made of a steel plate diaphragm generally has a high rigidity when the curvature is large, and a rigidity is low when the curvature is small. However, if the curvature is small, the extension of the iron plate is suppressed to be small, so that the plate thickness becomes thick. Therefore, the opposing surface 178 has a small curvature but a large plate thickness, and can suppress a decrease in rigidity to some extent. Further, since there is no strong noise source in the vicinity of the opposing surface 178 like the surface 180 in the vicinity of the discharge path, the size of the sealed container 102 can be suppressed small while maintaining the noise level low.

  As a result, it is possible to provide a narrow hermetic compressor that maintains a low noise level.

  Further, since the width of the sealed container 102 can be suppressed to be small, the amount of oil 108 sealed in the sealed container 102 can be reduced, and the cost can be reduced.

  The compression element 106 vibrates greatly by repeating the suction / compression process, and the vibration is not attenuated by the discharge path 142 but is propagated to the discharge pipe 190 to vibrate the discharge pipe 190. However, the discharge pipe 190 is fixed to the connection surface a184 having a larger curvature than the surface 176 in the vicinity of the discharge muffler. Since the connection surface a184 has a large curvature and high rigidity, resonance of the connection surface a184 can be prevented even when the discharge pipe 190 is vibrated, and as a result, the noise level can be further reduced.

  The suction pipe 192 connected to the cooling system is fixed to a connection surface b186 having a larger curvature than the surface 176 in the vicinity of the discharge muffler. Since the connection surface b186 has a large curvature and high rigidity, even if vibration is propagated from the cooling system to the suction pipe 192, resonance of the connection surface b186 can be prevented. As a result, the noise level can be further reduced.

  Further, the surface 182 in the vicinity of the suction muffler has a high curvature and thus has high rigidity, and resonance can be prevented by the radiated sound generated from the front surface portion 152 of the suction muffler, and the noise level can be further reduced.

(Embodiment 2)
FIG. 4 is a schematic diagram when the hermetic compressor according to the second embodiment of the present invention is mounted on a household refrigerator or the like which is a kind of cooling device.

  The details of the hermetic compressor will be described with reference to FIGS. 1, 2, and 3.

  In FIG. 4, the cooling device 210 includes a cooling system 212, an interior 214, an engine room 218 opened on the back surface 216 side of the cooling device 210, an interior 214, and a partition wall 220 that partitions the engine room 218.

  The cooling system 212 is equipped with the hermetic compressor 222 shown in the first embodiment. From the hermetic compressor 222, a condenser 224, a dryer 226, an expander 228, an evaporator 230, and a hermetic compressor 222. They are connected in order to form a refrigeration cycle. Inside the cooling system 212, HFC refrigerants such as R134a and R404A and HC refrigerants such as R600a and R290a are sealed.

  The hermetic compressor 222 is formed so that the curvature of the surface 234 in the vicinity of the discharge muffler is larger than the curvature of the opposing surface 236, and the surface 234 in the vicinity of the discharge muffler is arranged toward the inside of the engine room 218. .

  The operation and action of the cooling device configured as described above will be described below.

  At the time of cooling, the evaporator 230 cools the inside 214 of the cooling chamber by energizing the hermetic compressor 222 and rotating a so-called refrigeration cycle that sucks, compresses, condenses, decompresses and expands the refrigerant in the cooling system 212.

  In the hermetic compressor 222, a surface 234 near the discharge muffler having a large curvature is disposed toward the inside of the engine room 218, and a facing surface 236 having a small curvature is disposed toward the outside of the engine room 218. Therefore, since the hermetic compressor 222 can be installed outside the engine room 218 so that the opposing surface 236 is along the back surface 216 side of the cooling device 210, the partition wall 220 can be designed to project to the engine room 218 side. As a result, the space in the engine room 218 can be saved, and only the volume of the interior 214 can be expanded while keeping the size of the cooling device 210 as it is.

  As described above, the hermetic compressor according to the present invention can provide a narrow hermetic compressor by providing a small-sized hermetic container, so that it can be used for a vending machine, a freezer showcase, a dehumidifier, and the like. It can also be applied to.

Front sectional view of the hermetic compressor according to the first embodiment of the present invention. Side sectional view of a hermetic compressor in the same embodiment Plan sectional view of the hermetic compressor in the same embodiment Schematic at the time of mounting the hermetic compressor in Embodiment 2 of this invention in a cooling device Front sectional view of a conventional hermetic compressor Side sectional view of a conventional hermetic compressor Schematic diagram when installing a conventional hermetic compressor in a cooling device

Explanation of symbols

102,232 Sealed container 106 Compression element 112 Block 114 Cylinder 116 Discharge muffler 120 Piston 130 Intake / exhaust valve 132 Discharge chamber 134 Cylinder head 142 Discharge path 144 Discharge muffler side space 150 Suction muffler 176, 234 Surfaces near discharge muffler 178, 236 Opposing surfaces 184 Connection surface a
186 Connection surface b
190 Discharge pipe 210 Cooling device 218 Engine room 222 Hermetic compressor

Claims (5)

  A compression element that compresses the refrigerant gas and a sealed container that accommodates the compression element are provided, and the compression element is disposed at a block that forms a cylinder, a piston that reciprocates in the cylinder, and an opening end of the cylinder. An intake / exhaust valve, a cylinder head disposed on the side opposite to the cylinder sandwiching the intake / exhaust valve, having a discharge chamber, a discharge muffler formed in the block and communicating with the discharge chamber, the discharge muffler, and the outside of the sealed container A hermetic compressor having a discharge path that communicates, wherein the sealed container is formed such that a curvature of a surface near the discharge muffler is larger than a curvature of an opposing surface thereof.   2. The hermetic compressor according to claim 1, wherein a resin suction muffler is disposed in the vicinity of the cylinder head.   The hermetic compressor according to claim 1, wherein the discharge path is disposed in a discharge muffler side space in the sealed container.   The airtight container connects the surface in the vicinity of the discharge muffler and its opposite surface with a connection surface having a larger curvature than the surface in the vicinity of the discharge muffler, and the discharge pipe to which the discharge path is connected is fixed to the connection surface. The hermetic compressor as described.   An engine room is provided, and the hermetic compressor according to any one of claims 1 to 4 is accommodated in the engine room, and the hermetic compressor has a surface near the discharge muffler of the hermetic container in the engine room. Cooling device arranged toward the inside.

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