JP2008050961A - Compressor and refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high quality reliable compressor and refrigerator capable of reducing noise by reducing collision of a component against an inner wall of a compressor due to a shock transmitted in stopping operation of the compressor or in closing a door. <P>SOLUTION: A cylinder block 108 is formed out of material of smaller specific gravity than that of a stator of an electric element, and a compression element 107 is lightened as compared with the electric element 106. Consequently, the cylinder block 108 taking majority of the compression element 107 from a volume point of view is lightened and weight of the compression element 107 is reduced. Since inertia force of the compressor main body 108 at a time of rolling is reduced together with increase of stability of the compressor main body 108 by moving a position of a center of gravity of a compressor main body 108 down, collision of a hermetic vessel 103 with the compressor main body 108 is prevented, and the silent and reliable compressor can be provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a compressor and a refrigerator equipped with the compressor.

  In recent years, refrigerators are required to be more energy-saving from the viewpoint of protecting the global environment, and to be further silenced from the viewpoint of improving usability and storage capacity, as well as improving amenities.

  Hereinafter, the conventional compressor and refrigerator will be described with reference to the drawings. In the following description, the upper and lower relationships are based on a state in which the compressor and the refrigerator are installed in a normal posture.

  FIG. 11 is a side sectional view of a conventional compressor, and FIG. 12 is a side sectional view of a conventional refrigerator.

  First, the compressor 50 is formed by an electric element 6 including a stator 28 and a rotor 31 in the hermetic container 3, and a compression element 7 positioned above the electric element 6 and driven by the electric element 6. The compressor main body 8 is housed (see, for example, Patent Document 1). The oil 5 is stored at the bottom of the sealed container 3, and the compressor body 8 is elastically supported on the lower part of the sealed container 3 by an elastic member 37, for example, a spring.

  In the compression element 7, the main shaft 14 of the crankshaft 16 that is supported by the bearing portion 13 of the cylinder block 10 rotates with the rotation of the rotor 31, and the rotational movement of the eccentric shaft 15 of the crankshaft 16 It is transmitted to the piston 12 through 17.

  The piston 12 is reciprocally inserted into a bore hole 11 of a cylinder 9 formed integrally with the cylinder block 10, and forms a compression chamber 18 together with the bore hole 11 and the valve plate 44. The piston 12 reciprocates in the bore hole 11 to suck and compress the refrigerant 4 in the compression chamber 18. This type of compressor 50 is commonly used in household refrigerators.

  The suction muffler 19 is sandwiched by the cylinder head 21 that covers the valve plate 44.

  In general, most of the members constituting the compression element 7 are made of iron-based material having good workability such as cast iron or sintering except for the connecting means 17, the cylinder head 21, the suction muffler 19, and the like. Has been.

  On the other hand, the electric element 6 includes a stator 28 in which a winding is directly wound around magnetic pole teeth of a stator core 27 in which iron-based silicon steel plates are laminated via an insulating material, and a rotor core 29 in which iron-based silicon steel plates are similarly laminated. A salient pole concentrated winding type DC brushless motor composed of a rotor 31 containing a permanent magnet is mainly used.

  The stator 28 is fastened to the lower surface of the leg portion 32 extending from below the cylinder block 10 by a bolt 34 inserted into a through hole 33 provided in the stator core 27.

  Conventionally, this type of compressor 50 has been installed at the lower back or upper part of the refrigerator main body (see, for example, Patent Document 2).

  The refrigerator 60 discharges cold air generated by a refrigeration cycle in which a compressor 50, an evaporator 63, a condenser (not shown), and an expander (not shown) are connected by piping or the like. It is used to lower the temperature and store foods frozen and refrigerated.

  The box body 65 of the refrigerator has a configuration of a refrigerator room 71, a vegetable room 73, and a freezer room 74 from the top.

  The refrigerating room 71 has a rotary door 75 that is a rotary type whose end is rotatably supported via a hinge on the front surface of the box body 65. Further, the vegetable compartment 73 has a drawer door 78 that is slidable forward and backward via a rail (not shown), and the freezer compartment 74 is reciprocated similarly to the vegetable compartment 73. It has a drawer door 78 of the formula.

  A gasket 80 for closing the inside and the outside of the refrigerator by closely contacting the seal surface 79 of the box main body 65 and the impact when the door is closed at the inner edges of the rotary door 75 and the drawer door 78. Is installed.

  In addition, a plurality of door pockets 76 for storing food and the like are provided inside the rotary door 75.

Above the box body 65, a recess 83 is provided that is recessed toward the refrigerator compartment 71 over the top surface 81 and the back surface 82 of the box body 65. In the recess 83, a compressor 50, a machine room fan (not shown), a condenser (not shown), a dryer (not shown), and the like are installed.
JP 2000-145637 A JP-A-11-183014

  However, in the compressor 50 having the above conventional configuration, when the operation is stopped, depending on the position of the piston 12 in the reciprocating direction, the pressure of the refrigerant 4 remaining in the compression chamber 18 acts to push the piston 12 back. As a result, the compression element 7 may roll. When the roll is large, the compression element 7 collides with the inner wall of the hermetic container 3 of the compressor 50, and a phenomenon such as so-called hook contact occurs.

  In addition, in the refrigerator 60 having the above-described conventional configuration, when the rotary door 75 is closed with a large amount of food stored in the door pocket 76, the gasket 80 provided on the edge of the rotary door 75 and the seal surface 79 of the box body 65. When an impact occurs, an impact force that cannot be completely absorbed by the gasket 80 is transmitted from the seal surface 79 to the box body 65, and the refrigerator 60 may swing back and forth. In such a case, since the compressor 50 swings around, the compression element 7 and the inner wall of the sealed container 3 may collide with each other and a hook contact may occur.

  Since the main material of both the compression element 7 and the airtight container 3 is iron-based, a metallic sound is generated at the time of collision. This could be perceived as annoying and uncomfortable for the refrigerator user.

  Further, when the sealed container 3 and the compression element 7 collide with each other, crushed pieces are generated due to minute breakage, and if this is caught in a shaft sliding gap represented by the cylinder block 10 and the crankshaft 16, abnormal wear or compression will occur. Inability (lock) could occur.

  In addition, a refrigerant pipe for conveying the compressed refrigerant 4 to the next stroke, for example, a discharge thin tube 23 is also provided in the compressor 50, and the discharge thin tube 23 is frequently in contact with the sealed container 3, the compression element 7, and the like. In this case, metal fatigue gradually accumulates at the contact portion, eventually leading to a brittle fracture of the discharge capillary 23, and the compressor 50 may become incompressible.

  The present invention solves the above-described conventional problems, and reduces the hook contact of the compressor 50 that is generated by an impact that is propagated when the compressor 50 is shut down or when the rotary door 75 is closed. An object of the present invention is to provide a high-quality compressor and a refrigerator that can be made highly reliable.

  In order to solve the above-described conventional problems, a compressor according to the present invention includes, in an airtight container, an electric element including a stator and a rotor, and a compression element driven by the electric element above the electric element. The compressor element comprises a crankshaft having a main shaft and an eccentric shaft, a cylinder block having a bore hole that rotatably supports the main shaft and forms a compression chamber, and the bore A piston that reciprocates in the hole, and a connecting means that connects the piston and the eccentric shaft, and a lower surface of a leg portion extending from below the cylinder block is joined to an upper surface of the stator. The compressor main body is elastically supported via an elastic member between a receiving portion fixed to a lower surface of the stator and a bottom portion of the hermetic container, and the cylinder block is more than the stator. Specific gravity Together are molded in Sai material, wherein the compression element is obtained by reduce the weight in comparison with the electric element.

  This reduces the weight of the compression block by reducing the weight of the cylinder block that occupies most of the compression element in terms of volume, and lowers the center of gravity of the compressor body. Since the inertial force of the compressor main body at the time of shaking is reduced, the collision between the compressor main body and the hermetic container can be suppressed to prevent contact between the hooks, the noise can be reduced, and a highly reliable compressor can be provided.

  Further, the refrigerator of the present invention has a box body in which a storage room having a revolving door that opens and closes on the front surface is disposed at the top, and is recessed to the storage room side over the top surface and the back surface of the box body. In the closed container, and in a sealed container, there is a compressor body composed of an electric element composed of a stator and a rotor, and a compression element driven by the electric element above the electric element. A crankshaft having a main shaft and an eccentric shaft, a cylinder block having a bore hole that rotatably supports the main shaft and forms a compression chamber, a piston that reciprocates in the bore hole, the piston, and the piston The compressor main body is provided with a connecting means for connecting an eccentric shaft, and the lower surface of the leg portion extending from below the cylinder block is joined to the upper surface of the stator, and the lower surface of the stator and the lower surface of the stator Fixed to the bottom of the sealed container The cylinder block is formed of a material having a specific gravity smaller than that of the stator, and the compression element is heavier than the electric element. A lighter compressor is installed.

  This reduces the kinetic energy of the compressor body when rolling, even with a refrigerator equipped with a compressor behind the revolving door that has a high impact force when closed, coupled with improved stability of the compressor body. By mounting the compressor that can be made to occur, the collision between the compressor main body and the sealed container can be suppressed to prevent the hook from hitting, the noise can be reduced, and a highly reliable refrigerator can be provided.

  The compressor and the refrigerator of the present invention suppress the collision between the compressor body and the sealed container to prevent the hook contact, so that the noise can be reduced and the highly reliable compressor and refrigerator can be provided. It is done.

  The invention according to claim 1 has a compressor body including an electric element composed of a stator and a rotor, and a compression element driven by the electric element above the electric element in a sealed container, The compression element includes a crankshaft having a main shaft and an eccentric shaft, a cylinder block having a bore hole that rotatably supports the main shaft and forms a compression chamber, and a piston that reciprocates in the bore hole. The compressor main body includes a connecting means for connecting the piston and the eccentric shaft, and a lower surface of a leg portion extending from below the cylinder block is joined to an upper surface of the stator. The cylinder block is formed of a material having a specific gravity smaller than that of the stator, and is elastically supported through an elastic member between a lower surface of the child and a receiving portion fixed to the bottom of the sealed container. And In the compression element is obtained by reduce the weight in comparison with the electric element.

  This reduces the weight of the cylinder block, which occupies most of the compression element from the viewpoint of volume, and lowers the center of gravity of the compressor body, which in combination with improved stability of the compressor body and the inertia of the compressor body during rolling Since the force is reduced, the collision between the compressor main body and the sealed container can be suppressed to prevent the hook contact, the noise can be reduced, and a highly reliable compressor can be provided.

  The invention according to claim 2 is the invention according to claim 1, wherein the position of the center of gravity of the compressor body is within the height dimension of the electric element.

  As a result, the center of gravity position is within the height dimension of the electric element, and coupled with improved stability of the compressor body, the rolling of the compression element is mitigated by the magnetic force between the stator and the rotor. In addition, it is possible to provide a highly reliable compressor that suppresses the collision of the closed container and prevents the hook contact and can reduce noise.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the main material of the electric element is iron-based and the main material of the cylinder block is aluminum-based.

  As a result, the specific gravity is about 1/3 of that of conventional iron-based materials, lowering the center of gravity of the compressor body, and using materials such as aluminum die casting and aluminum alloy casting that are inexpensive and have good workability. In addition, the collision between the compressor main body and the hermetic container can be suppressed to prevent contact between the hooks, noise reduction can be achieved, and a highly reliable and inexpensive compressor can be provided.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the main material of the piston is aluminum.

  Thus, by molding the piston with a material whose specific gravity is about 1/3 of that of the conventional iron system, the refrigerant remaining in the compression chamber tries to push the piston back immediately after the operation of the compressor is stopped. Even if the reaction force acts on the compression element, the weight of the piston is light, so the inertial force applied to the compression element is reduced to reduce the rolling, and the collision between the compressor body and the sealed container is suppressed and Therefore, it is possible to provide a compressor with high reliability and noise reduction.

  The invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein the main material of the piston is a resin.

  As a result, by molding the piston with a material having a specific gravity of about 1/4 to 1/10 of that of the conventional iron system, the refrigerant remaining in the compression chamber pushes the piston immediately after the operation of the compressor is stopped. Even if the reaction force to be returned acts on the compression element, the weight of the piston is light, so the inertial force applied to the compression element is reduced to reduce rolling and suppress the collision between the compressor body and the sealed container. Thus, it is possible to provide a compressor with high reliability that can prevent the hook from hitting and reduce noise.

  The invention according to claim 6 is the invention according to claim 4 or 5, wherein an iron-based elastic ring is engaged with the side surface of the piston.

  Thereby, since the elastic ring engaged with the side surface of the piston is along the inner peripheral surface of the cylinder, the leakage of the refrigerant can be suppressed without processing the side surface of the piston with high accuracy. It is possible to provide a highly reliable and inexpensive compressor that can prevent collision between the main body of the compressor and the hermetic container to prevent contact with the hook, and can be quiet.

  The invention according to claim 7 is a refrigerator equipped with the compressor according to any one of claims 1 to 6.

  By installing a compressor that can suppress rolls on the back of the refrigerator, the impact of the impact force when the door is closed can be mitigated, so the collision between the compressor body and the sealed container is suppressed. Thus, the hook contact can be prevented, noise reduction can be achieved, and a highly reliable refrigerator can be provided.

  The invention according to claim 8 is the invention according to claim 7, further comprising a box body in which a storage chamber having a revolving door that opens and closes on the front surface is arranged at the uppermost stage, and the top surface and the back surface of the box body. A compressor is installed in a recess that is recessed toward the storage chamber.

  As a result, by installing a compressor on the back of the refrigerator that can suppress rolls, the stability of the compressor itself, even in refrigerators that have a compressor behind the revolving door that has a high impact force when closed. Combined with the improvement, by installing a compressor that can reduce the kinetic energy of the compressor body when rolling, the collision between the compressor body and the sealed container is suppressed, and the noise per unit is prevented and the noise is reduced. Therefore, it is possible to provide a refrigerator with high reliability and high usability and storage.

  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 side sectional view of a compressor according to Embodiment 1 of the present invention, FIG. 2 is a plan sectional view of the compressor according to the embodiment, FIG. 3 is an enlarged sectional view of a piston according to the embodiment, and FIG. It is a characteristic view which shows the behavior of the compressor immediately after the stop of operation in the same embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  A mortar-shaped lower container 101 formed by deep drawing a rolled steel plate having a thickness of 2 to 4 mm and an inverted mortar-shaped upper container 102 are engaged, and the entire portion is welded to form a sealed container 103. The Inside the airtight container 103 is filled with isobutane (R600a) as the refrigerant 104, stores mineral oil as the oil 105, and a compressor main body 108 including the electric element 106 and the compression element 107 is disposed.

  The compression element 107 includes a cylinder block 110 in which a cylinder 109 is integrally formed, a piston 112 that is reciprocally fitted in a bore hole 111 of the cylinder 109, and a main shaft 114 that is pivotally supported by a bearing 113 of the cylinder block 110. A crankshaft 116 comprising a core shaft 115 and a connecting means 117 for connecting the eccentric shaft portion 115 and the piston 112 are provided, and the rotational motion of the crankshaft 116 is converted into the reciprocating motion of the piston 112.

  The cylinder block 110 constituting the skeleton of the compression element 107 and occupying most of the compression element 107 is integrally formed by aluminum die casting (JIS: ADC12) mainly made of aluminum.

  On the other hand, the piston 112 has an expansion coefficient at the time of heat load equivalent to that of the cylinder 109, and must maintain a gap with the bore hole 111 to suppress refrigerant leakage. (JIS: AC8C). In addition, since sliding between aluminum is generally likely to cause adhesive wear, PTFE (polytetrafluoroethylene) resin having a solid lubricating effect is blended on the surface based on PAI (polyamideimide) resin. A wear-resistant coating 143 is coated.

  The space volume of the compression chamber 118 formed by the piston 112, the bore hole 111, and the valve plate 144 is increased or decreased by the reciprocating motion of the piston 112, so that the refrigerant 104 in the hermetic container 103 is allowed to flow into the suction port of the suction muffler 119. After being sucked in from 120 and sucked and compressed in the compression chamber 118 through a valve (not shown) provided in the cylinder head 121, a discharge capillary is discharged from a discharge muffler 122 formed in the cylinder block 110. 123, the gas is discharged to a discharge pipe 125 outside the sealed container 103 through a discharge tube 124 which is a high-pressure pipe provided in the sealed container 103.

  The discharge thin tube 123 is a steel tube having an inner diameter of 1.5 mm to 3.0 mm, and is formed by L-shaped or U-shaped bending. Further, the discharge thin tube 123 and the discharge tube 124 of the sealed container 103 are joined with elasticity at a connection portion 126.

  The electric element 106 is located below the cylinder block 110 and the main material is iron. In general, a permanent magnet 130 is mounted on a stator 128 in which a winding is directly wound around a magnetic pole tooth of a stator core 127 in which iron-based silicon steel plates are laminated via an insulating material, and a rotor core 129 in which iron-based silicon steel plates are similarly laminated. A salient pole concentrated winding type DC brushless motor composed of a rotor 131 including a main body is mainly used. The electric element 106 is driven at a plurality of operation frequencies including an operation frequency lower than the commercial power supply frequency by an inverter drive circuit.

  The stator 128 is fastened to the lower surface of the leg portion 132 extending from below the cylinder block 110 by a bolt 134 inserted into a through hole 133 provided in the stator core 127. The compressor main body 108 is elastically supported via a spring as an elastic member 137 between a support portion 136a fixed to the receiving portion 135 at the bottom of the hermetic container 103 and a support portion 136b fixed to the lower end of the stator 128. Has been.

  The discharge tube 124 and the suction tube 142 formed on the side surface of the sealed container 103 are welded to the discharge pipe 125 and the suction pipe 164 formed on the refrigerator side, respectively, and are fixed below the sealed container 103. Since the leg 138 is fixed to the installation surface 186 provided on the back side of the refrigerator via the pin 140, the sealed container 103 constituting the outer shell of the compressor 150 is restrained by the refrigerator. It is in such a state.

Here, the specific gravity of the aluminum-based material is about 2.7 g / cm ^3, which is about 1/3 of the specific gravity of the iron-based material (about 7.8 g / cm ³ ). The weight of the cylinder block 110 in which the main material is made of an aluminum system is about 500 g, while the weight of the stator 128 in which the main material is made of an iron system is about 1500 g.

  Thus, since the cylinder block 110 is formed of a material having a specific gravity smaller than that of the stator 128, the cylinder block forms a skeleton, and the weight of the compression element 107 that occupies most of the volume is approximately 1500 g in total. On the other hand, the weight of the electric element 106 is about 2000 g as a whole, and the weight of the compression element 107 is lighter than the weight of the electric element 106.

  A result obtained by analyzing the center of gravity of the compressor main body 108 is indicated by a point G in the figure. Thus, it can be seen that the center of gravity position G is within the height dimension of the electric element 106.

  Therefore, in the present embodiment, the stability of the compressor body is improved by reducing the weight of the cylinder block 110 that occupies most of the compression element 107 from the viewpoint of volume and lowering the position of the center of gravity of the compressor body 108. In addition, since the weight of the compressor main body 108 is reduced, the inertial force that acts on the compressor main body 108 during rolling can be reduced. Furthermore, we experimentally confirmed the phenomenon in which the magnetic force between the rotor 131 and the stator 128 acts to alleviate the roll by setting the position of the center of gravity within the range of the height dimension of the electric element 106. Yes.

  Next, the behavior of the compressor immediately after the operation in which the hook contact occurs sporadically stops will be described with reference to FIG.

  Immediately after the operation is stopped, the compressor main body 108 is suddenly braked, so that the compressor main body 108 slightly rolls in the directions of arrows B1 and B2 shown in the figure. After that, the crankshaft 116 is rotating by inertia for about one to two turns, but in the direction of arrow A by the refrigerant 104 remaining in the compression chamber 118 formed by the piston 112, the bore hole 111, and the valve plate 144. The piston 112 is pushed back, and the main shaft 113 of the crankshaft 116 rotates in a direction B2 opposite to the rotation direction arrow B1.

  At the moment when the main shaft 114 rotates in the direction of the arrow B2, the compressor body 108 composed of the compression element 107 and the electric element 106 is apparently subjected to a centrifugal force in the B2 direction by elastic support, and is fixed to the sealed container 103. Twist occurs in the discharge thin tube 123 welded to the discharge tube 124 and the elastic member 137 at the bottom of the sealed container 103. Thereafter, due to the elastic restoring force of the discharge thin tube 123 and the elastic member 137, the compressor main body 108 has an arc-shaped arrow centered on the connection portion 126 where the discharge thin tube 123 and the discharge tube 124 of the sealed container 103 are joined. It swings around in the C1 and C2 directions. At this time, if the first roll immediately after the stop and the roll caused by the pushing back of the piston 112 by the remaining refrigerant are combined, the roll width exceeds the gap distance between the compressor body 108 and the inner wall of the sealed container 103. As a result, both sides collide to generate a so-called hook contact.

  However, in the present embodiment, the piston 112 is made of an aluminum system (specific gravity is about 1/3 as compared with an iron system generally used in the past), so it remains very light and remains. Reducing the inertial force acting on the piston when the refrigerant is pushed back in the direction of the arrow A and reducing the speed at which the main shaft 113 of the crankshaft 116 rotates in the direction of the arrow B2 due to the reaction. Thus, the swing of the compressor main body 108 is suppressed.

  According to the inventor's compressor test using the compressor (the test evaluating the hook contact when the power was turned off after operating with pressure as a parameter), a conventional iron cylinder block and piston were used. It has been confirmed that the frequency per hook is reduced by about 50% in comparison with the compressor.

  From the above, when the refrigerant remaining in the compression chamber when the suction compression operation stops, the kinetic energy acting on the compressor is reduced when the piston is pushed back, thereby suppressing the collision between the compressor body and the sealed container. Thus, it is possible to provide a highly reliable compressor and refrigerator that can prevent the hook contact and reduce noise.

(Embodiment 2)
5 is a side sectional view of the compressor according to the second embodiment of the present invention, FIG. 6 is an enlarged perspective view of the piston according to the same embodiment, and FIG. 7 shows the behavior of the compressor immediately after the operation stop in the same embodiment. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  A mortar-shaped lower container 201 formed by deep drawing of a rolled steel plate having a thickness of 2 to 4 mm is engaged with an inverted mortar-shaped upper container 202, and the entire portion is welded to form a sealed container 203. The Inside the sealed container 203 is filled with isobutane (R600a) as the refrigerant 204, stores mineral oil as the oil 205, and a compressor main body 208 including the electric element 206 and the compression element 207 is disposed.

  The compression element 207 includes a cylinder block 210 that forms the cylinder 209, a piston 212 that is reciprocally fitted in the bore hole 211 of the cylinder 209, and a main shaft portion 214 that is pivotally supported by a bearing 213 of the cylinder block 210 and an eccentricity. A crankshaft 216 comprising a shaft portion 215 and a connecting means 217 for connecting the eccentric shaft portion 215 and the piston 212 are provided, and the rotational motion of the crankshaft 216 is converted into the reciprocating motion of the piston 212.

  The cylinder block 210 that forms the skeleton of the compression element 207 and occupies most of the skeleton is integrally formed by aluminum die casting (JIS: ADC12) mainly made of aluminum.

  On the other hand, the piston 212 is molded of PAI (polyamideimide) resin having a thermal expansion coefficient substantially equal to that of the aluminum die casting that is the material of the cylinder block 210. In general, since the processing accuracy of resin is about several tens of μm, an elastic ring 245 made of cast iron having elasticity is mounted near the tip of the piston 212. The elastic ring 245 is engaged with a ring mounting groove 248 provided near the top surface 247 of the piston 212.

  After engagement with the piston 212, the piston 212 and the elastic ring 245 are mounted in the bore hole 211 of the cylinder 209 with the abutment 246 provided in the elastic ring 245 being closed. At this time, the elastic ring 245 is brought into close contact with the inner peripheral wall of the bore hole 211 with a force to open radially, so-called tension. As a result, the inner circumference wall of the bore hole 211 is evenly adapted, and a stable function can be exhibited even after long-term use.

  Thereby, it is not necessary to finish the processing accuracy of the piston 212 on the order of several μm, so the specification is excellent in processing productivity. In the present embodiment, a cast iron elastic ring 245 having a good conformability and containing a large amount of graphite having a solid lubricating effect is used. However, depending on the severe use conditions, for example, chromium nitride is formed on the surface of the elastic ring 245. You may give ceramic coating as represented.

  The space volume of the compression chamber 218 formed by the piston 212, the bore hole 211, and the valve plate 244 is increased or decreased by the reciprocating motion of the piston 212, so that the refrigerant 204 in the hermetic container 203 is allowed to flow into the suction port of the suction muffler 219. After being sucked from 220 and sucked and compressed in the compression chamber 218 via a valve (not shown) provided inside the cylinder head 221, the discharge capillary is discharged from a discharge muffler 222 formed in the cylinder block 210. It is discharged to a discharge pipe 225 outside the sealed container 203 through a discharge tube 224 that is a high-pressure pipe provided in the closed container 203.

  The discharge thin tube 223 is a steel tube having an inner diameter of 1.5 mm to 3.0 mm, and is formed by bending an L shape or a U shape. Further, the discharge thin tube 223 and the discharge tube 224 of the sealed container 203 are joined with elasticity at a connection portion 226.

  The electric element 206 is located below the cylinder block 210, and the main material is iron. Generally, a permanent magnet 230 is attached to a stator 228 in which a winding is directly wound around a magnetic pole tooth of a stator core 227 in which iron-based silicon steel plates are laminated, and a rotor core 229 in which iron-based silicon steel plates are similarly laminated. A salient pole concentrated winding type DC brushless motor composed of a rotor 231 including a main body is the mainstream. The electric element 206 is driven at a plurality of operation frequencies including an operation frequency lower than the commercial power supply frequency by an inverter drive circuit.

  The stator 228 is fastened to the lower surface of the leg portion 232 extending from below the cylinder block 210 by a bolt 234 inserted into a through hole 233 provided in the stator core 227. The compressor main body 208 is elastically supported via a spring which is an elastic member 237 between a support portion 236a fixed to the receiving portion 235 at the bottom of the sealed container 203 and a support portion 236b fixed to the lower end of the stator 228. Has been.

  The discharge tube 224 and the suction tube 242 formed on the side surface of the sealed container 203 are respectively welded to the discharge pipe 225 and the suction pipe 264 formed on the refrigerator side, and are fixed below the sealed container 203. Since the leg 238 is fixed to the installation surface 286 provided on the back side of the refrigerator via the pin 140, the sealed container 203 constituting the outer shell of the compressor 150 is restrained by the refrigerator. State.

  Next, the behavior of the compressor immediately after the operation in which the hook contact occurs sporadically stops will be described with reference to FIG.

  Immediately after the operation is stopped, the compressor body 208 suddenly brakes, so that the compressor body 208 slightly rolls in the directions of arrows B1 and B2 shown in the figure. After that, the crankshaft 216 is rotated by inertia for about one to two rotations, but in the direction of arrow A by the refrigerant 204 remaining in the compression chamber 218 formed by the piston 212, the bore hole 211, and the valve plate 244. The piston 212 is pushed back, and the main shaft 213 of the crankshaft 216 rotates in the direction B2 opposite to the arrow B1 in the rotation direction.

  At the moment when the main shaft 214 rotates in the direction of the arrow B2, the centrifugal force apparently acts in the B2 direction by the elastic support on the compressor body 208 including the compression element 207 and the electric element 206, and is fixed to the sealed container 203. Twist occurs in the discharge thin tube 223 welded to the discharge tube 224 and the elastic member 237 at the bottom of the sealed container 203. Thereafter, due to the elastic restoring force of the discharge thin tube 223 and the elastic member 237, the compressor main body 208 causes the arcuate arrow centering on the connection portion 226 where the discharge thin tube 223 and the discharge tube 224 of the sealed container 203 are joined. It swings around in the C1 and C2 directions. At this time, if the initial roll immediately after the stop and the roll caused by the pushing back of the piston 212 by the remaining refrigerant are combined, the roll width exceeds the gap distance between the compressor body 208 and the inner wall of the sealed container 203. As a result, both sides collide to generate a so-called hook contact.

  However, in the present embodiment, the piston 212 is molded with PAI resin (specific gravity 1/5 or less as compared with conventional iron-based materials). By relatively reducing the inertial force acting on the piston when the piston 212 is pushed back in the direction of arrow A, the speed at which the main shaft 213 of the crankshaft 216 rotates in the direction of arrow B2 by reaction is reduced. , The swinging of the compressor body 208 is suppressed.

  According to the inventor's compressor test using the compressor (the test evaluating the hook contact when the power was turned off after operating with pressure as a parameter), a conventional iron cylinder block and piston were used. It has been confirmed that the frequency per hook is reduced by about 60% compared to the compressor.

  From the above, when the refrigerant remaining in the compression chamber when the suction compression operation stops, the kinetic energy acting on the compressor is reduced when the piston is pushed back, thereby suppressing the collision between the compressor body and the sealed container. Thus, it is possible to provide a highly reliable compressor and refrigerator that can prevent the hook contact and reduce noise.

(Embodiment 3)
8 is a side sectional view of the compressor according to the third embodiment of the present invention, FIG. 9 is a side sectional view of the refrigerator according to the same embodiment, and FIG. 10 is a view of the compressor when the rotary door is closed according to the same embodiment. It is a characteristic view which shows a behavior.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  Inside the sealed container 303 is filled with isobutane (R600a) as the refrigerant 304, stores mineral oil as the oil 305, and a compressor main body 308 including the electric element 306 and the compression element 307 is disposed.

  The compression element 307 includes a cylinder block 310 that forms a cylinder 309, a piston 312 that is reciprocally fitted in a bore hole 311 of the cylinder 309, a main shaft portion 314 that is pivotally supported by a bearing 313 of the cylinder block 310, and an eccentricity. A crankshaft 316 including a shaft portion 315 and a connecting means 317 for connecting the eccentric shaft portion 315 and the piston 312 are provided, and the rotational motion of the crankshaft 316 is converted into the reciprocating motion of the piston 312.

  The cylinder block 310 constituting the skeleton of the compression element 307 and occupying most of the compression element 307 is integrally formed by aluminum die casting (JIS: ADC12) mainly made of aluminum.

  On the other hand, the piston 312 is molded from an aluminum alloy casting (JIS: AC8C) whose main material is aluminum, from the viewpoint of expansion during heat load. In addition, since sliding between aluminum is generally likely to cause adhesive wear, PTFE (polytetrafluoroethylene) resin having a solid lubricating effect is blended on the surface based on PAI (polyamideimide) resin. Abrasion resistant coating is applied.

  The space volume of the compression chamber 318 formed by the piston 312, the bore hole 311, and the valve plate 344 is increased or decreased by the reciprocating motion of the piston 312, so that the refrigerant 304 in the sealed container 303 is allowed to flow into the suction port of the suction muffler 319. After being sucked from 320 and sucked and compressed in the compression chamber 318 via a valve (not shown) provided inside the cylinder head 321, the discharge capillary is discharged from a discharge muffler 322 formed in the cylinder block 310. It is discharged to a discharge pipe 325 outside the sealed container 303 via a discharge tube 324 which is a high-pressure pipe provided in the closed container 303. The discharge thin tube 323 and the discharge tube 324 of the sealed container 303 are joined with elasticity at a connection portion 326.

  The electric element 306 is located below the cylinder block 310, and the main material is iron. Generally, a permanent magnet 330 is formed on a stator 328 in which a winding is directly wound around magnetic pole teeth of a stator core 327 in which iron-based silicon steel plates are laminated, and a rotor core 329 in which iron-based silicon steel plates are similarly laminated. A salient pole concentrated winding type DC brushless motor composed of a rotor 331 enclosing a coil is the mainstream. The electric element 306 is driven by the inverter drive circuit at a plurality of operation frequencies including an operation frequency lower than the commercial power supply frequency.

  The stator 328 is fastened to the lower surface of the leg portion 332 extending from below the cylinder block 310 by a bolt 334 inserted into a through hole 333 provided in the stator core 327. The compressor main body 308 is elastically supported via a spring which is an elastic member 337 between a support portion 336a fixed to the receiving portion 335 at the bottom of the hermetic container 303 and a support portion 336b fixed to the lower end of the stator 328. Has been.

Here, the specific gravity of the aluminum-based material is about 2.7 g / cm ^3, which is about 1/3 of the specific gravity of the iron-based material (about 7.8 g / cm ³ ). The weight of the cylinder block 310 in which the main material is molded from an aluminum system is about 500 g, while the weight of the stator 328 in which the main material is molded from an iron system is about 1500 g.

  Thus, since the cylinder block 310 is formed of a material having a specific gravity smaller than that of the stator 328, the cylinder block 310 forms a skeleton, and the weight of the compression element 307 that occupies most of the volume is approximately about as a whole. On the other hand, the weight of the electric element 306 is about 2000 g as a whole, and the weight of the compression element 307 is lighter than the weight of the electric element 106.

  The position of the center of gravity of the compressor main body 308 is obtained by analysis and is indicated by a point G in the figure. Thereby, it can be seen that the center-of-gravity position G is within the height dimension of the electric element 306.

  Next, the refrigerator 360 will be described.

  The refrigerator 360 includes a compressor 350, a discharge pipe 325 connected to the compressor 350, a condenser (not shown), a capillary 361 that is a decompressor, a dryer (not shown) that removes moisture, The box body 365 has a built-in refrigeration cycle constituted by connecting an evaporator 363 in the vicinity of the internal fan 362 and an intake pipe 364, and discharges the cold air generated by the refrigeration cycle, The temperature in the storage chamber 366 is lowered, and food and the like are stored frozen and refrigerated.

  The box body 365 injects a heat insulating body 369 for foam filling into a space formed by an inner box 367 formed by vacuum-forming a resin body such as ABS and an outer box 368 using a magnetic body made of a metal material such as a pre-coated steel plate. It has a thermal insulation wall.

  The box main body 365 is divided into a plurality of heat insulating sections, and doors 370 are provided on the front surface of the box main body 365, respectively. From the top, the heat-insulated storage room 366 is a refrigerating room 371, a switching room 372a and an ice making room 372b provided side by side, a vegetable room 373, and a freezing room 374.

  The refrigerator compartment 371 is provided with two rotary doors 375 whose end portions are rotatably supported via hinges. The revolving door 375 is provided with a plurality of door pockets 376 as spaces for storing food and the like.

  On the other hand, the switching chamber 372a, the ice making chamber 372b, the vegetable chamber 373, and the freezing chamber 374 are all drawer chambers 377, all of which can be slid forward and backward via rails (not shown). Drawer doors 378a, 378b, 378c, and 378d, which are formulas, are provided.

  When the inside and outside of the refrigerator are shut off by close contact with the seal surface 379 of the box body 365 at the inner edges of the revolving door 375 and the drawer doors 378a, 378b, 378c, 178d, and each door 370 is closed A gasket 380 for absorbing the impact is attached.

  The gasket 380 is formed by extruding a soft vinyl chloride resin body having features such as durability, flexibility, and economy and having excellent processability. The gasket 380 contains a permanent magnet and a large number of air pockets divided by a partition, and the seal surface 379 on the side of the box body 365 to which the gasket 380 is closely attached is one end surface of the outer box 368. Thus, it becomes a magnetic body.

  Above the box body 365, a recess 383 is provided that is recessed toward the refrigerator compartment 371 over the top surface 381 and the back surface 382 of the box body 365. The concave portion 383 is provided with a top cover 384 fixed with screws or the like, and includes a compressor 350, a machine room fan (not shown), a condenser (not shown), a dryer (not shown), a discharge A part of the pipe 325 and the suction pipe 364 are accommodated.

  A plurality of legs 338 are fixed below the sealed container 303 of the compressor 350, and are fixed to the recesses 383 of the refrigerator through elastic mounting rubbers 339 locked to the legs 338. The position is fixed by loosely fitting the hole 141 of the mount rubber 339 to the provided pin 340.

  A mechanism per hook of the compressor generated under the influence from the outside of the compressor will be described with reference to FIG.

  In general, there is angular momentum as a quantity representing the momentum of the rotating body. Angular momentum is proportional to each of mass, circumferential speed, and rotational radius. That is, as the angular momentum applied to the rotary door 375 increases when the rotary door 375 is closed, the impact force generated at the time of collision between the rotary door 375 and the side receiving the rotary door, that is, the seal surface 379 of the box body 365 is smaller. growing. Further, the impact force affects the vertical direction with respect to the front surface 185 of the refrigerator.

  Factors that affect the overall angular momentum include the mass of the revolving door 375 and the food stored in the door pocket 376, the circumferential speed of the revolving door 375 immediately before the collision with the seal surface 379, and the revolving door. The width is 375. These govern the overall impact force applied to the box body 301 of the refrigerator when the gasket 380 and the sealing surface 379 collide.

  When the revolving door 375 is closed, a magnetic force acts between the permanent magnet built in the gasket 380 and the seal surface 379 made of a magnetic material, and the gasket 380 comes into close contact with the seal surface 379. At this time, although the air pocket built in the gasket 380 absorbs the impact force to some extent, the impact force that cannot be completely absorbed is transmitted to the box body 365 of the refrigerator through the seal surface 379.

  Nowadays, the main capacity of the main refrigerator capacity band is 300L or more. Thereby, as the refrigerator size increases, the width of the revolving door 375 increases, and in addition, the total amount of the revolving door 375 including the stored items is inevitably increased due to the increase in the amount of storage in the door pocket 376. It is presumed that the impact force applied to the box body 365 when the revolving door 375 is closed increases synergistically.

  This also applies to the drawer door 378, and the storage capacity tends to increase. Therefore, when the drawer door is closed, an impact force that cannot be absorbed by the gasket 380 is transmitted to the box body 365 of the refrigerator through the seal surface 379. become.

  The discharge tube 324 and the suction tube 342 formed on the side surface of the sealed container 303 are respectively welded to the discharge pipe 323 and the suction pipe 364 formed on the refrigerator side, and are fixed below the sealed container 303. Since the leg 338 is fixed to the installation surface 386 of the recess 383 via the pin 340, it can be said that the sealed container 303 constituting the outer shell of the compressor 350 is in a state of being restrained by the refrigerator. . Therefore, when the refrigerator swings in the front-rear direction (arrow B1 direction, B2 direction in the figure) due to the impact (arrow A in the figure) from the front surface 385 when the revolving door 375 is closed, the sealed container 303 is pulled to the refrigerator. In the same manner, it will swing back and forth.

  On the other hand, inside the compressor 350 at the moment of impact, the compressor body 308 composed of the compression element 307 and the electric element 306 is not only subjected to an apparent inertial force in the B2 direction due to elastic support, but also sealed. Along with the vibration of the container 303, the support part 336a fixed to the receiving part 335 at the bottom of the sealed container 303 is displaced in the direction of arrow B1, and the discharge welded to the discharge tube 324 fixed to the sealed container 303. A force that pulls the compressor main body 308 in the direction of the arrow B <b> 1 through the thin tube 323 acts, and the elastic member 337 is twisted. Thereafter, due to the restoring force due to the elasticity of the elastic member 337 and the discharge thin tube 323, the compressor main body 308 has an arc-shaped arrow C1 centering on the connection portion 326 where the discharge thin tube 323 and the discharge tube 324 of the sealed container 303 are joined. , It swings around in the C2 direction.

  Therefore, in the present embodiment, the main shaft 313 is moved in the direction of the arrow B1 by molding the cylinder block 310 with an aluminum-based material having a specific gravity smaller than that of the stator 328 and reducing the weight of the compressor body 308. At the moment of rotation, the centrifugal force acting on the compressor body 108 in the direction of the arrow B1 or B2 is reduced as a whole, and the compression element 107 located above the compressor 150 from the side is located below. By making it lighter than the electric element 106, the stability of the compressor body is improved, so that the compressor 150 can be prevented from hitting the hook, and noise reduction can be achieved, and a highly reliable compressor and refrigerator are provided. can do.

  In addition, in the present embodiment, since the piston 312 is formed of an aluminum system (specific gravity is about 1/3 as compared with an iron system generally used conventionally), the compressor 312 is very lightweight. The inertial force acting on the piston 312 when the refrigerant remaining in the compression chamber 318 immediately after the operation of the piston is pushed back in the direction of the arrow A is relatively reduced, and the main shaft of the crankshaft 316 is caused by the reaction. By reducing the speed at which 313 rotates in the direction of the arrow B2, the whirling of the compressor main body 308 is suppressed.

  From the above, the compressor main body 308 and the hermetic container 303 are reduced by reducing the rolling of the compressor 350 immediately after the compressor 350 is stopped or when a force applied from outside the compressor 350 is applied. Therefore, it is possible to provide a highly reliable compressor and refrigerator.

  As described above, since the refrigerator according to the present invention can achieve noise reduction and has high reliability, it can be applied to domestic and commercial compressors and refrigerator-freezers.

Side sectional view of the compressor according to Embodiment 1 of the present invention. Plan sectional drawing of the compressor in the embodiment The expanded sectional view of the piston of the embodiment Characteristic diagram showing the behavior of the compressor immediately after shutdown in the same embodiment Side sectional view of the compressor according to Embodiment 2 of the present invention. Enlarged perspective view of the piston of the same embodiment Characteristic diagram showing the behavior of the compressor immediately after shutdown in the same embodiment Side sectional view of the compressor according to Embodiment 3 of the present invention. Side sectional view of the refrigerator of the same embodiment Characteristic diagram showing the behavior of the compressor when the revolving door is closed in the same embodiment Side view of a conventional compressor Side view of a conventional refrigerator

Explanation of symbols

103, 203, 303 Airtight container 106, 206, 306 Electric element 107, 207, 307 Compression element 108, 208, 308 Compressor body 110, 210, 310 Cylinder block 111, 211, 311 Bore hole 112, 212, 312 Piston 114 , 214, 314 Main shaft 115, 215, 315 Eccentric shaft 116, 216, 316 Crankshaft 117, 217, 317 Connecting means 118, 218, 318 Compression chamber 128, 228, 328 Stator 131, 231, 331 Rotor 132, 232, 332 Leg 135, 235, 335 Receiving part 137, 237, 337 Elastic member 150, 250, 350 Compressor 245 Elastic ring 360 Refrigerator 365 Box body 366 Storage room 375 Revolving door 381 Top surface 382 Back surface 383 Recessed part 3 85 front

Claims (8)

  A hermetic container includes a compressor body including an electric element including a stator and a rotor, and a compression element driven by the electric element above the electric element. The compression element includes a main shaft and an eccentricity. A crankshaft having a shaft; a cylinder block having a bore hole that rotatably supports the main shaft and forming a compression chamber; a piston that reciprocates in the bore hole; the piston and the eccentric shaft; And a compressor body in which a lower surface of a leg portion extending from below the cylinder block is joined to an upper surface of the stator, the lower surface of the stator and a bottom portion of the sealed container The cylinder block is molded of a material having a specific gravity smaller than that of the stator, and the compression element is Compressor weight is lighter than the dynamic element.   The compressor according to claim 1, wherein the position of the center of gravity of the compressor body is within the height dimension of the electric element.   The compressor according to claim 1 or 2, wherein the main material of the electric element is iron-based and the main material of the cylinder block is aluminum-based.   The compressor according to any one of claims 1 to 3, wherein a main material of the piston is aluminum.   The compressor according to any one of claims 1 to 3, wherein a main material of the piston is resin.   The compressor according to claim 4 or 5, wherein an elastic ring is engaged with a side surface of the piston.   A refrigerator equipped with the compressor according to any one of claims 1 to 6.   A storage room with a revolving door that opens and closes on the front has a box body arranged at the top, and a compressor is installed in a recess recessed on the side of the storage room across the top and back of the box body. The refrigerator according to claim 7.

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