JP2010229834A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost and highly-reliable hermetic compressor stably supplying lubricating with a small supply amount of lubricating oil. <P>SOLUTION: By providing a buffer means 129 for absorbing an impact in the axial direction caused by a collision between an oil cone 127 and a hermetic container 101, the gap between the lower end of the oil cone 127 and the bottom of the hermetic container 101 is reduced, the opening provided on the lower end of the oil cone 127 is immersed in a small amount of lubricating oil 103, and the lubricating oil 103 is stably supplied to sliding parts. Therefore, a low-cost and highly-reliable hermetic compressor is provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement in an oil cone that supplies lubricating oil to each sliding portion of a hermetic compressor.

  In recent years, hermetic compressors used in refrigeration cycle apparatuses such as household refrigerator-freezers, vending machines, and air conditioners are required to have high reliability and low cost.

  As a conventional hermetic compressor, one in which an oil cone is fixedly held at the lower end of the main shaft portion of the crankshaft is generally used (see, for example, Patent Document 1).

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

  FIG. 5 is a longitudinal sectional view of a conventional hermetic compressor described in Patent Document 1. As shown in FIG.

  In FIG. 5, the airtight container 1 stores the lubricating oil 2 and accommodates the electric compression element 5 including the electric element 3 and the compression element 4 driven by the electric element 3. The electric compression element 5 is elastically supported in the sealed container 1 by a plurality of springs 6.

  The electric element 3 includes a stator 7 in which plate-shaped stator iron cores are stacked and a copper wire is wound, and a rotor 8 that is rotatably accommodated in the stator 7.

  The compression element 4 includes a main shaft portion 9 on which a rotor 8 is mounted and an upper portion of the main shaft portion 9. The compression element 4 includes an eccentric shaft portion 10 whose center axis is shifted, and an oil supply mechanism that pumps up the lubricating oil 2 upward. The provided crankshaft 11 is provided.

  A spiral groove 12 is formed on the outer periphery of the main shaft portion 9 forming a part of the crankshaft 11, a centrifugal pump 13 is provided inside, and an oil cone 14 is fixedly held at the lower end. The lower end of the oil cone 14 is opened in the lubricating oil 2 while securing an appropriate distance from the sealed container 1.

  The compression element 4 includes a cylinder block 16 having a cylindrical compression chamber 15, and a bearing portion 17 that is formed in the cylinder block 16 and rotatably supports the crankshaft 11.

  A compression chamber 15 formed in the cylinder block 16 is provided with a reciprocating piston 18, and the piston 18 is rotatably connected to an eccentric shaft portion 10 disposed on an upper portion of the crankshaft 11.

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

  During the transportation of the hermetic compressor, the electric compression element 5 elastically supported by the plurality of springs 6 moves up and down and left and right within the space of the hermetic container 1. At this time, since an appropriate distance is secured between the oil cone 14 and the sealed container 1, collision between the oil cone 14 and the sealed container 1 is avoided, and damage and deformation of the oil cone 14 are prevented. ing.

Next, in the operation of the hermetic compressor, when the electric element 3 is energized, the electric element 3 is activated and the rotor 8 rotates, and the crankshaft that is integrally mounted with the rotor 8 is mounted. 11 is rotated, and the rotational movement of the eccentric shaft portion 10 disposed on the upper part of the crankshaft 11 is caused to reciprocate in the compression chamber 15 by reciprocatingly moving the piston 18 to compress the refrigerant. The refrigerant is sent out to the system.

On the other hand, the lubricating oil 2 stored at the bottom in the sealed container 1 is lubricated from the opening provided at the lower end of the oil cone 14 by the centrifugal force generated by the rotation of the oil cone 14 fixedly held on the crankshaft 11. Oil 2 is sucked in, pumped upward by a centrifugal pump 13 provided inside the main shaft portion 9, passes through a spiral groove 12 formed on the outer periphery of the main shaft portion 9, and slides on the bearing portion 17 and the compression element 4. Part of the lubricating oil 2 is taken out to the system together with the flow of the refrigerant.
JP 2000-205129 A

  However, in the above conventional configuration, the electric compression element 5 elastically supported by the plurality of springs 6 vibrates vertically and horizontally in the space of the hermetic container 1 during the conveyance of the hermetic compressor. At this time, in order to avoid a collision between the oil cone 14 and the sealed container 1, an appropriate distance in the axial direction is ensured between the oil cone 14 and the sealed container 1.

  On the other hand, during operation of the hermetic compressor, a part of the lubricating oil 2 stored in the hermetic container 1 is sucked up from the oil cone 14 and used for lubrication of each sliding part, and a part is taken out to the system together with the flow of the refrigerant. Therefore, the amount of the lubricating oil 2 stored at the bottom of the sealed container 1 is reduced. Therefore, it is necessary to sufficiently immerse the lower part of the oil cone 14 in order to stably lubricate the sliding portions.

  However, since an appropriate distance is provided between the oil cone 14 and the sealed container 1 in order to avoid a collision, a large amount of lubrication is required to immerse the lower portion of the oil cone 14 in the lubricating oil 2. The oil 2 needs to be sealed in the hermetic container 1 and has a problem that the cost increases.

  An object of the present invention is to solve the above-described conventional problems, and to provide a stable and reliable supply of lubricating oil with a small amount of lubricating oil. Therefore, an object of the present invention is to provide a low-cost and highly reliable hermetic compressor. To do.

  In order to solve the above-described conventional problems, the hermetic compressor of the present invention has an oil cone that opens to the lubricating oil at the lower end of the main shaft portion of the crankshaft, and at the time when the oil cone collides with the hermetic container. By providing a buffer means for absorbing the collision in the axial direction, the gap between the lower end of the oil cone and the bottom of the sealed container can be reduced, and a buffer means is provided even if the oil cone and the sealed container collide during transportation. Therefore, the oil cone can be prevented from being damaged and deformed. On the other hand, by reducing the gap between the oil cone and the sealed container, the lower part of the oil cone is stored at the bottom of the sealed container even with a small amount of lubricating oil. It has the effect of being sufficiently immersed in the lubricating oil.

  Since the hermetic compressor of the present invention can supply a stable amount of lubricating oil with a small amount of lubricating oil, a hermetic compressor with low cost and high reliability can be provided.

The invention according to claim 1 is a crankshaft that stores lubricating oil in an airtight container, accommodates an electric compression element including an electric element and a compression element driven by the electric element, and constitutes the compression element An oil cone that opens to the lubricating oil is disposed at the lower end of the main shaft portion of the main body, and is provided with a buffer means for absorbing an axial collision when the oil cone collides with the sealed container. The axial gap between the airtight container and the airtight container can be reduced, and even if the oil cone and the airtight container collide during transportation or the like, the shock absorbing means absorbs the impact force at the time of collision. The impact force at the time of collision is weakened, and the oil cone can be prevented from being damaged and deformed.

  On the other hand, by reducing the axial gap between the oil cone and the sealed container, the lower part of the oil cone is immersed in the lubricant stored in the bottom of the sealed container even with a small amount of lubricating oil. Therefore, it is possible to provide a low-cost and highly reliable hermetic compressor.

  According to a second aspect of the present invention, in the first aspect of the present invention, the buffer means includes an oil cone inserted into an inner diameter side or an outer diameter side of the main shaft portion, and the oil cone is axially disposed with respect to the main shaft portion. In addition to the effects of the invention according to claim 1, in addition to the effects of the invention according to claim 1, the reliability is further reduced. It is possible to provide a high-pressure hermetic compressor.

  According to a third aspect of the present invention, in the second aspect of the present invention, the oil cone is formed of a material having a specific gravity smaller than that of the lubricating oil, and the oil cone is sealed with the buoyancy in the axial direction of the oil cone. Since the impact force at the time of collision with the container is further reduced, in addition to the effect of the invention of claim 2, it is possible to provide a highly reliable hermetic compressor at a lower cost.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the buffer means is formed by forming at least a part of the oil cone with an elastic body. Therefore, in addition to the effect of the first aspect of the invention, it is possible to provide a hermetic compressor with low cost and high reliability.

  The invention according to claim 5 is the effect of the invention according to claim 4 because the elastic body is a coil spring in the invention according to claim 4 and the elastic body can be made with an inexpensive coil spring. In addition, a highly reliable hermetic compressor can be provided at low cost.

  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 according to Embodiment 1 of the present invention, and FIG. 2 is an assembly view of a crankshaft and an oil cone according to the embodiment.

  In FIG. 1 and FIG. 2, an electric compression element 109 including an electric element 105 and a compression element 107 driven by the electric element 105 is accommodated in the sealed container 101. The electric compression element 109 is elastically supported in the sealed container 101 by a plurality of springs 111.

  The electric element 105 includes a stator 113 in which plate-shaped stator cores are stacked and a copper wire is wound thereon, and a rotor 115 that is rotatably accommodated in the stator 113.

The compression element 107 includes a main shaft portion 117 on which a rotor 115 is mounted and an upper portion of the main shaft portion 117. The compression element 107 includes an eccentric shaft portion 119 whose center axis is shifted, and an oil supply mechanism that pumps up the lubricating oil 103 upward. The provided crankshaft 121 is provided.

  A spiral groove 123 is formed on the outer periphery of the main shaft portion 117 forming a part of the crankshaft 121, a centrifugal pump 125 is provided inside, and an oil cone 127 that opens to the lubricating oil 103 is provided at the lower end. In addition, a buffer means 129 is provided for absorbing the collision in the axial direction when the oil cone 127 and the sealed container 101 collide. Furthermore, the oil cone 127 is assembled so that the distance between the lower end portion of the oil cone 127 and the bottom portion in the sealed container 101 is as small as possible.

  The compression element 107 includes a cylinder block 133 having a cylindrical compression chamber 131, and a bearing portion 135 that is formed in the cylinder block 133 and rotatably supports the crankshaft 121. The compression chamber 131 is formed with a reciprocating piston 137, and the piston 137 is rotatably connected to an eccentric shaft portion 119 disposed on the crankshaft 121.

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

  During the conveyance of the hermetic compressor, the electric compression element 109 elastically supported by the plurality of springs 111 vibrates vertically and horizontally in the space of the hermetic container 101. When the electric compression element 109 vibrates in the axial direction (vertical direction), the lower end portion of the oil cone 127 and the bottom portion in the sealed container 101 collide with each other.

  At this time, since the buffering means 129 is provided, the impact force at the time of collision is reduced by the buffering means 129, and the oil cone 127 can be prevented from being damaged and deformed.

  Next, in the operation of the hermetic compressor, when the electric element 105 is energized, the electric element 105 is activated to rotate the rotor 115, and the crankshaft that is integrally mounted with the rotor 115. 121 is rotated, and the rotational movement of the eccentric shaft portion 119 disposed on the upper portion of the crankshaft 121 is caused to reciprocate in the compression chamber 131 by reciprocating the piston 137 that is rotatably connected to compress the refrigerant. The refrigerant is sent out to the system.

  On the other hand, the lubricating oil 103 stored at the bottom in the sealed container 101 sucks the lubricating oil 103 from the opening provided at the lower end of the oil cone 127 by the centrifugal force generated by the rotation of the oil cone 127, and the main shaft portion 117. The pump is pumped upward by a centrifugal pump 125 provided inside the shaft, passes through a spiral groove 123 formed on the outer periphery of the main shaft portion 117, and is supplied to each sliding portion of the bearing portion 135 and the compression element 107. The lubricating oil 103 is taken out to the system along with the flow of the refrigerant.

  At this time, since the axial gap between the lower end portion of the oil cone 127 and the bottom portion in the sealed container 101 is small, the opening portion provided at the lower end portion of the oil cone 127 is covered with the lubricating oil 103 with a small amount of the lubricating oil 103. Since it can be immersed and the lubricating oil 103 can be stably supplied to each sliding part, a low-cost and highly reliable hermetic compressor can be provided.

  Further, an oil cone 127 is inserted into the main shaft portion 117 as a buffer means and is movable in the axial direction with respect to the main shaft portion 117, so that the electric compression element 109 vibrates in the axial direction (vertical direction), and the oil cone 127. When the lower end of the cylinder and the bottom of the airtight container 101 collide, the oil cone 127 expands and contracts in the axial direction between the insertion with the main shaft part 117 to buffer the impact at the time of the collision, thereby breaking the oil cone 127 And deformation can be prevented.

Therefore, since it is a buffer means which prevented the shift of the shaft core with a simple configuration, a low-cost and highly reliable hermetic compressor can be provided.

  Furthermore, by forming the oil cone 127 with a material having a specific gravity smaller than that of the lubricating oil 103, the electric compression element 109 vibrates in the axial direction (vertical direction), and the lower end portion of the oil cone 127 and the bottom portion in the sealed container 101 are separated. In the event of a collision, the buoyancy in the axial direction of the oil cone 127 further reduces the force at the time of the collision between the oil cone 127 and the sealed container 109 and prevents the oil cone 127 from being damaged and deformed. A high hermetic compressor can be provided.

  Further, by forming the oil cone 127 with a material having a specific gravity smaller than that of the lubricating oil 103, the oil cone 127 floats while being partially immersed in the lubricating oil 103, and is always located away from the bottom in the sealed container 101. . Therefore, although the oil cone 127 expands and contracts in the axial direction during insertion with the main shaft portion 117, the lubricating oil 103 can always be pumped up through the oil cone 127, and the oil cone 127 and the bottom portion in the sealed container 101 are in contact with each other. Can also be prevented.

(Embodiment 2)
FIG. 3 is a longitudinal sectional view of the hermetic compressor according to the second embodiment of the present invention, and FIG. 4 is an assembly diagram of the crankshaft and the oil cone according to the second embodiment.

  3 and 4, the airtight container 201 stores the lubricating oil 203 and houses an electric compression element 209 including an electric element 205 and a compression element 207 driven by the electric element 205. The electric compression element 209 is elastically supported in the sealed container 201 by a plurality of springs 211.

  The electric element 205 includes a stator 213 in which plate-shaped stator iron cores are stacked and a copper wire is wound, and a rotor 215 that is rotatably accommodated in the stator 213.

  The compression element 207 includes a main shaft portion 217 on which a rotor 215 is mounted and an upper portion of the main shaft portion 217. The compression element 207 includes an eccentric shaft portion 219 whose center axis is shifted, and an oil supply mechanism that pumps up the lubricating oil 203 upward. A crankshaft 221 is provided.

  A spiral groove 223 is formed in the outer periphery of the main shaft portion 217 forming a part of the crankshaft 221. A centrifugal pump 225 is provided in the inside. The lower end opens to the lubricating oil 203, and at least a part thereof is an elastic body. An oil cone 227, which is 226, is provided. Furthermore, the oil cone 227 is assembled so that the distance between the lower end portion of the oil cone 227 and the bottom portion in the sealed container 201 is as small as possible.

  The compression element 207 includes a cylinder block 233 having a cylindrical compression chamber 231, and a bearing portion 235 that is formed in the cylinder block 233 and rotatably supports the crankshaft 221. The compression chamber 231 is formed with a piston 237 that reciprocates, and the piston 237 is rotatably connected to an eccentric shaft portion 219 disposed on an upper portion of the crankshaft 221.

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

  During the conveyance of the hermetic compressor, the electric compression element 209 elastically supported by the plurality of springs 211 vibrates vertically and horizontally in the space of the hermetic container 201. When the electric compression element 209 vibrates in the axial direction (vertical direction), the lower end portion of the oil cone 227 collides with the bottom portion in the sealed container 201.

  At this time, since at least a part of the oil cone 227 is formed by the elastic body 226 which is the buffer means 229, the impact force at the time of collision is reduced by the elastic body 226, and the oil cone 227 is prevented from being damaged and deformed. be able to.

  Next, in the operation of the hermetic compressor, when the electric element 205 is energized, the electric element 205 is activated and the rotor 215 rotates, and the crankshaft that is integrally mounted with the rotor 215 is mounted. 221 is rotated, and the rotational movement of the eccentric shaft portion 219 disposed on the upper portion of the crankshaft 221 is caused by reciprocating the piston 237 that is rotatably connected in the compression chamber 231, compressing the refrigerant, and compressing it. The refrigerant is sent out to the system.

  On the other hand, the lubricating oil 203 stored at the bottom in the sealed container 201 sucks the lubricating oil 203 from the opening provided at the lower end of the oil cone 227 by the centrifugal force generated by the rotation of the oil cone 227, and the main shaft portion 217. The pump is pumped upward by a centrifugal pump 225 provided inside the shaft, passes through a spiral groove 223 engraved on the outer periphery of the main shaft portion 217, and is supplied to each sliding portion of the bearing portion 235 and the compression element 207. The lubricating oil 203 is taken out to the system together with the refrigerant flow.

  At this time, since the axial gap between the lower end portion of the oil cone 227 and the bottom portion in the sealed container 201 is small, the opening portion provided at the lower end portion of the oil cone 227 with a small amount of the lubricating oil 203 is covered with the lubricating oil 203. Since it can be immersed and the lubricating oil 203 can be stably supplied to each sliding part, a low-cost and highly reliable hermetic compressor can be provided.

  Further, as shown in FIG. 4, the elastic body 226 forming at least a part of the oil cone 227 is constituted by an inexpensive coil spring 240, thereby providing a low-cost and highly reliable hermetic compressor. be able to.

  As described above, the hermetic compressor according to the present invention can supply a stable lubricating oil with a small amount of lubricating oil, and can provide a low-cost and highly reliable hermetic compressor. It can also be applied to applications such as household refrigeration refrigerators, vending machines, refrigeration cycle devices such as air conditioners.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. Assembly drawing of crankshaft and oil cone in the same embodiment Vertical sectional view of a hermetic compressor according to Embodiment 2 of the present invention Assembly drawing of crankshaft and oil cone in the second embodiment Vertical section of a conventional hermetic compressor

101, 201 Airtight container 103, 203 Lubricating oil 105, 205 Electric element 107, 207 Compression element 109, 209 Electric compression element 121, 221 Crankshaft 117, 217 Main shaft part 127, 227 Oil cone 129, 229 Buffering means 226 Elastic body 240 coil spring

Claims (5)

The lubricating oil is stored in a sealed container, and an electric compression element including an electric element and a compression element driven by the electric element is accommodated, and the lubricating oil is disposed at a lower end of a main shaft portion of a crankshaft constituting the compression element. A hermetic compressor provided with a buffer means for disposing an oil cone that opens in the shaft and absorbing an axial collision when the oil cone collides with the hermetic container. 2. The hermetically sealed type according to claim 1, wherein the buffer means is configured such that an oil cone is inserted into an inner diameter side or an outer diameter side of the main shaft portion, and the oil cone is movable in an axial direction with respect to the main shaft portion. Compressor. The hermetic compressor according to claim 2, wherein the oil cone is formed of a material having a specific gravity smaller than that of the lubricating oil. The hermetic compressor according to claim 1, wherein the buffer means is configured by forming at least a part of the oil cone with an elastic body. The hermetic compressor according to claim 4, wherein the elastic body is a coil spring.