JP2010127217A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reciprocating type hermetic compressor having small vibrations and high productivity and connected to a refrigerating cycle such as an electric refrigerator, an air conditioner and a freezing/refrigerating device. <P>SOLUTION: The hermetic compressor includes a crankshaft having a main shaft part 109 and an eccentric shaft part 110 and including a balance weight 111. The balance weight 111 includes a weight part 121 and a fixation part 120 and the fixation part 120 is arranged on a main shaft part 109 side of the eccentric shaft part 110. A part of the fixation part 120 is processed and removed so that rotational unbalance of a piston, a connection means, the eccentric shaft part 110 and the like is adjusted to balance. There is thus provided the hermetic compressor in which adjustment for having more balance is made even when inertia force of the balance weight 111 is insufficient, variation of vibrations is suppressed and the vibrations themselves are reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to low vibration of a hermetic compressor connected to a refrigeration cycle such as an electric refrigerator, an air conditioner, and a refrigeration apparatus.

  In recent years, due to demands due to housing circumstances, household refrigerators are increasingly moving toward low vibration. Under such circumstances, the method of using a balance weight in order to balance the main vibration source piston is effective as an elemental technique for reducing vibration.

  As a conventional hermetic compressor, there is one that adjusts the unbalanced force of the hermetic compression mechanism by providing the crankshaft with a balance weight having a substantially arc-shaped outer shape (see, for example, Patent Document 1). ).

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

  7 is a longitudinal sectional view of a conventional hermetic compressor described in Patent Document 1, FIG. 8 is an exploded view of a main part of the conventional hermetic compressor, and FIG. 9 is an arrow view in the direction C in FIG. FIG.

  7 to 9, the hermetic container 1 is filled with a refrigerant gas 2, and an electric element 5 including a stator 3 and a rotor 4, and a compression element 6 driven by the electric element 5 are suspension springs. 7 is accommodated elastically.

  The crankshaft 8 has a main shaft portion 9 press-fitted and fixed to the rotor 4, a balance weight 11 of the same member integrally cast with the main shaft portion 9, an eccentric shaft portion 10 formed eccentrically with respect to the main shaft portion 9, The block 13 has a cylinder 14 which is a substantially cylindrical compression chamber. The piston 15 is inserted into the cylinder 14 so as to be slidable back and forth, and is connected to the eccentric shaft portion 10 by a connecting means 16.

  Above the eccentric shaft portion 10 of the crankshaft 8, a separate balance weight 12 centering on the shaft center of the main shaft portion 9 is fixed.

  Since the balance weight 11 and the separate balance weight 12 of the main shaft portion 9 and the same member balance the rotational imbalance, they greatly contribute to low vibration and low noise of the hermetic compressor.

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

  The rotor 4 of the electric element 5 rotates the crankshaft 8, and the rotational movement of the eccentric shaft portion 10 is transmitted to the piston 15 via the connecting means 16, so that the piston 15 reciprocates within the cylinder 14. As a result, the refrigerant gas 2 is sucked and compressed from the cooling system (not shown) into the cylinder 14 and then discharged to the cooling system again.

When performing this compression action, the piston 15 reciprocates to generate a reciprocating inertial force that is an unbalanced force. This reciprocating inertia force is balanced by providing a balance weight 11 and a separate balance weight 12 so as to have an opposite phase to the piston 15, and vibration is reduced by offsetting the reciprocating inertia force of the piston 15 in the horizontal direction. I am letting.
JP 2002-70740 A

  However, in the above-described conventional configuration, the balance weight 11 and the separate balance weight 12 of the main shaft portion 9 and the same member are disposed on the horizontal extension of the piston 15 for reasons such as reducing the overall height of the hermetic compressor on the crankshaft 8. In this case, the balance weight 11 and the separate balance weight 12 cannot obtain a sufficiently large inertial force, and as a result, the reciprocating inertial force of the piston 15 cannot be sufficiently offset. There was a possibility that the vibration would increase.

  In particular, the balance weight 11 and the separate balance weight 12 are closest to the piston 15 when the piston 15 is at the bottom dead center. However, if the outer shape is designed to be substantially arcuate so as to avoid this interference, the above problem becomes significant. In addition, there is a possibility that the inertia force of the balance weight 11 and the separate balance weight 12 may be insufficient due to manufacturing variations.

  An object of the present invention is to provide a hermetic compressor with low vibration and high productivity.

  In order to solve the above conventional problems, the hermetic compressor of the present invention has a main shaft portion and an eccentric shaft portion and a crankshaft having a balance weight, and the balance weight has a weight portion and a fixed portion, The fixed part is arranged on the main shaft part side of the eccentric shaft part, and by adjusting and removing the part of the fixed part to balance the rotational unbalance of the piston, connecting means, eccentric shaft part, etc. Even when the inertial force of the weight is insufficient, the weight can be adjusted to be more balanced.

  The hermetic compressor of the present invention includes a crankshaft having a main shaft portion and an eccentric shaft portion and having a balance weight, the balance weight has a weight portion and a fixed portion, and the fixed portion is on the main shaft portion side of the eccentric shaft portion. Is adjusted to balance the rotational unbalance of the piston, connecting means, eccentric shaft part, etc. by processing and removing a part of the fixed part, even if there is insufficient inertia force of the balance weight, It is possible to provide a hermetic compressor that can be adjusted to be more balanced, suppress variation in vibration, and reduce vibration itself.

  According to a first aspect of the present invention, an electric element and a compression element driven by the electric element are accommodated in a hermetic container, and the compression element has a main shaft portion and an eccentric shaft portion and has a balance weight. A shaft, a block that forms a compression chamber, a piston that reciprocates in the compression chamber, and a coupling means that couples the piston and the eccentric shaft portion. The balance weight includes a weight portion and a fixing portion. The fixed portion is arranged on the main shaft portion side of the eccentric shaft portion, and a part of the fixed portion is processed and removed to balance rotational unbalance of the piston, the connecting means, the eccentric shaft portion, and the like. Even if there is a shortage of the reciprocating inertia force of the balance weight, it is adjusted to easily balance the rotational unbalance of the piston, connecting means, eccentric shaft, etc. Bets can be, suppress variations in the vibration, the vibration is small, it is possible to provide a highly productive hermetic compressor.

  The invention according to claim 2 is the invention according to claim 1, wherein a part of the anti-eccentric shaft portion side of the fixing portion or the outer edge portion of the fixing portion is processed and removed. In addition to the effects, the structure can be adjusted to balance effectively without reducing the strength of the structure.

  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 cross-sectional view of a hermetic compressor according to Embodiment 1 of the present invention, FIG. 2 is an exploded view of a main part of the hermetic compressor according to the same embodiment, and FIG. 3 is a view in the direction of arrow A in FIG. is there.

  1 and 2, the hermetic container 101 is filled with a refrigerant gas 102, and an electric element 105 including a stator 103 and a rotor 104, and a compression element 106 driven by the electric element 105 are suspended. The spring 107 is elastically accommodated.

  The block 113 forms a cylinder 114 that is a substantially cylindrical compression chamber, and a piston 115 is inserted into the cylinder 114 so as to be freely slidable. The piston 115 is connected to the eccentric shaft part 110 by the connecting means 116.

  The crankshaft 108 has a main shaft portion 109 press-fitted and fixed to the rotor 104, an eccentric shaft portion 110 formed eccentrically with respect to the main shaft portion 109, and includes a balance weight 111 and a separate balance weight 112.

  The balance weight 111 has a fixed portion 120 and a weight portion 121 for balancing with a reciprocating inertia force that is an unbalanced force, and the fixed portion 120 is disposed on the main shaft portion 109 side of the eccentric shaft portion 110.

  A separate balance weight 112 is inserted and fixed above the eccentric shaft portion 110 of the crankshaft 108.

  The material of the balance weight 111 is the same material as the crankshaft 108, or a hot rolled steel plate or a cold rolled steel plate.

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

  The rotor 104 of the electric element 105 rotates the crankshaft 108, and the rotational movement of the eccentric shaft portion 110 is transmitted to the piston 115 via the connecting means 116, so that the piston 115 reciprocates in the cylinder 114. As a result, the refrigerant gas 102 is sucked and compressed from the cooling system (not shown) into the cylinder 114 and then discharged to the cooling system again.

  When the compression action is performed, an unbalanced force is generated due to the reciprocating motion of the piston 115, but the reciprocating inertia force of the piston 115 in the horizontal direction is offset by the balance weight 111 and the separate balance weight 112 of the crankshaft 108. This reduces the vibration.

  Next, the balance weight 111 will be described.

  The balance weight 111 has a fixed portion 120 and a weight portion 121 for balancing with a reciprocating inertial force that is an unbalanced force.

  The balance weight 111 has a substantially disk shape arranged in parallel to the axial center of the piston 115, and the weight portion 121 of the balance weight 111 is located on the side of the eccentric shaft portion 110 with respect to the center of the main shaft portion 109. It arrange | positions and the fixing | fixed part 120 is arrange | positioned at the anti-eccentric axial part 110 side.

  The balance weight 111 reduces vibrations by canceling the unbalance moments of the piston 115, the coupling means 116, the eccentric shaft portion 110, and the fixed portion 120 that are generated when the piston 115 reciprocates when performing a compression action. is doing.

  In the weight portion 121, there is a case where the inertia force is insufficient due to an insufficient weight or an insufficient distance from the center of the crankshaft 108, and the unbalance moment due to the reciprocating motion of the piston 115 may not be offset.

  At that time, among the piston 115, the coupling means 116, the eccentric shaft portion 110, and the fixed portion 120 in which an unbalance moment is generated, the anti-eccentric shaft portion 110 of the fixed portion 120 is processed and removed as shown in FIG. 122), the shortage of the reciprocating inertia force of the weight portion 121 is compensated, and the unbalance moment due to the reciprocating motion of the piston 115 is adjusted to be offset.

  In particular, as shown in FIG. 2, since the machining removal portion 122 is far from the center of the main shaft portion 109, even if the weight is slightly reduced by the machining removal portion 122, the reciprocating inertia force of the weight portion 121 is insufficient. The effect which supplements is large.

  This is because the inertial force is proportional to the square of the distance from the center to the mass point.

  In the embodiment shown in FIG. 2, the center of gravity of the processing removal portion 122 and the center of gravity of the weight portion 121 are substantially the same distance from the center of the main shaft portion 109, and the weight portion 121 is compensated for the lack of reciprocal inertial force of the weight portion 121. By removing the equivalent mass from the machining removal unit 122 instead of adding the mass, there is an equivalent balance adjustment effect, that is, an unbalance moment canceling effect.

  In the crankshaft 108, since the eccentric shaft portion 110 and the fixed portion 120 are eccentric, stress is most generated between the center of the eccentric shaft portion 110 and the center of the main shaft portion 109 during the reciprocating motion of the piston 115. The processing removal portion 122 of the fixed portion 120 is not located between the center of the eccentric shaft portion 110 and the center of the main shaft portion 109 and is provided at a position where stress generation is low. Since there are almost no restrictions and it is difficult to be limited by the range of the processing removal portion and the size of processing, the piston 115, the coupling means 116, the eccentric shaft portion 110, and the fixed portion 120 that are generated when the piston 115 reciprocates. The balance adjustment range is wide so as to cancel the unbalance moment, and a large effect can be obtained.

  For this reason, when the weight part 121 cannot cancel the unbalance moment due to the reciprocating motion of the piston 115, the work removal part 122 shown in FIG. Thus, it is possible to provide a hermetic compressor that suppresses variations in vibration, has low vibration, and has high productivity.

(Embodiment 2)
4 is a cross-sectional view of the hermetic compressor according to the second embodiment of the present invention, FIG. 5 is an exploded view of a main part of the hermetic compressor according to the same embodiment, and FIG. 6 is an arrow in the direction B in FIG. FIG.

  4 and 5, the hermetic container 201 is filled with a refrigerant gas 202, and an electric element 205 including a stator 203 and a rotor 204, and a compression element 206 driven by the electric element 205 are suspended. The spring 207 is elastically accommodated.

  The block 213 forms a cylinder 214 which is a substantially cylindrical compression chamber, and a piston 215 is inserted into the cylinder 214 so as to be slidable back and forth. The piston 215 is connected to the eccentric shaft part 210 by the connecting means 216.

  The crankshaft 208 includes a main shaft portion 209 that is press-fitted and fixed to the rotor 204, an eccentric shaft portion 210 that is formed eccentrically with respect to the main shaft portion 209, and includes a balance weight 211 and a separate balance weight 212.

  The balance weight 211 has a fixed portion 220 and a weight portion 221 for balancing with a reciprocating inertia force which is an unbalanced force, and the fixed portion 220 is disposed on the main shaft portion 209 side of the eccentric shaft portion 210.

  A separate balance weight 212 is inserted and fixed above the eccentric shaft portion 210 of the crankshaft 208.

  The material of the balance weight 211 is the same material as the crankshaft 208, a hot-rolled steel plate, or a cold-rolled steel plate.

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

  The rotor 204 of the electric element 205 rotates the crankshaft 208, and the rotational movement of the eccentric shaft portion 210 is transmitted to the piston 215 via the connecting means 216, so that the piston 215 reciprocates within the cylinder 214. As a result, the refrigerant gas 202 is sucked and compressed from the cooling system (not shown) into the cylinder 214 and then discharged to the cooling system again.

  When the compression action is performed, an unbalanced force is generated due to the reciprocating motion of the piston 215. However, the balance weight 211 of the crankshaft 208 and the separate balance weight 212 cancel the reciprocating inertia force of the piston 215 in the horizontal direction. This reduces vibration.

  Next, the balance weight 211 will be described.

  The balance weight 211 has a fixed portion 220 and a weight portion 221 for balancing with a reciprocating inertial force that is an unbalanced force.

  The balance weight 211 has a substantially disc shape arranged in parallel to the axis of the piston 215, and the weight portion 221 of the balance weight 211 is located on the side of the eccentric shaft portion 210 with respect to the center of the main shaft portion 209. Arranged, the fixing part 220 is arranged on the side opposite to the eccentric shaft part 210.

  The balance weight 211 reduces vibration by canceling the unbalance moments of the piston 215, the connecting means 216, the eccentric shaft portion 210, and the fixed portion 220 that are generated when the piston 215 reciprocates when performing compression. is doing.

  In the weight portion 221, there is a case where the inertia force is insufficient due to an insufficient weight or a distance from the center of the crankshaft 208 and the unbalance moment due to the reciprocating motion of the piston 215 may not be offset.

  At that time, among the piston 215, the coupling means 216, the eccentric shaft portion 210, and the fixing portion 220 that generate an unbalance moment, the anti-eccentric shaft portion 210 of the fixing portion 220 is removed by machining as shown in FIG. 222), the shortage of the reciprocating inertia force of the weight portion 221 is compensated, and the unbalance moment due to the reciprocating motion of the piston 215 is adjusted to cancel.

  In particular, as shown in FIG. 5, since the processing removal unit 222 is far from the center of the main shaft portion 209, even if the processing removal unit 222 slightly reduces the weight, the reciprocal inertia force of the weight unit 221 is insufficient. The effect which supplements is large.

  This is because the inertial force is proportional to the square of the distance from the center to the mass point.

  In the embodiment shown in FIG. 5, the center of gravity of the processing removal portion 222 and the center of gravity of the weight portion 221 are substantially the same distance from the center of the main shaft portion 209, and the weight portion 221 is used to compensate for the shortage of the reciprocating inertia force of the weight portion 221. By removing the equivalent mass from the machining removal unit 222 instead of adding the mass, there is an equivalent balance adjustment effect, that is, an unbalance moment canceling effect.

  Further, in the crankshaft 208, since the eccentric shaft portion 210 and the fixed portion 220 are eccentric, the stress is most generated between the center of the eccentric shaft portion 210 and the center of the main shaft portion 209 during the reciprocating motion of the piston 215. The processing removal portion 222 of the fixed portion 220 is not located between the center of the eccentric shaft portion 210 and the center of the main shaft portion 209 and is provided at a position where stress generation is low. Since there are almost no restrictions and it is difficult to be restricted by the range of the processing removal portion and the size of processing, the piston 215 generated by the reciprocating motion of the piston 215, the connecting means 216, the eccentric shaft portion 210, and the fixing portion 220. The balance adjustment range is wide so as to cancel the unbalance moment, and a large effect can be obtained.

  In the processing removal unit 222 in the present embodiment, since the distance from the center of the main shaft portion 209 can be set to be the largest in the fixed portion 220, the effect of canceling the unbalance moment is further high.

  For this reason, when the weight part 221 cannot cancel the unbalance moment due to the reciprocating motion of the piston 215, the work removal part 222 shown in FIG. Therefore, it is possible to provide a hermetic compressor that suppresses variations in vibration and has low vibration and high productivity.

  As described above, the hermetic compressor according to the present invention enables an inexpensive hermetic compressor with low vibration while securing high productivity. It can be applied to a hermetic compressor used in a refrigeration cycle such as a vending machine.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. Main part exploded view of hermetic compressor in the same embodiment Arrow view of direction A in FIG. Vertical sectional view of a hermetic compressor according to Embodiment 2 of the present invention Main part exploded view of hermetic compressor in the same embodiment Arrow view of direction B in FIG. Longitudinal sectional view of a hermetic compressor in a conventional hermetic compressor Exploded view of the main parts of a conventional hermetic compressor Arrow view of direction C in FIG.

Explanation of symbols

101, 201 Airtight container 105, 205 Electric element 106, 206 Compression element 108, 208 Crankshaft 109, 209 Main shaft part 110, 210 Eccentric shaft part 111, 211 Balance weight 113, 213 Block 114, 214 Cylinder (compression chamber)
115, 215 Piston 116, 216 Connecting means 120, 220 Fixed part 121, 221 Weight part

Claims (2)

  An electric element and a compression element driven by the electric element are accommodated in an airtight container, and the compression element has a main shaft portion and an eccentric shaft portion, and a crankshaft having a balance weight, and a block forming a compression chamber And a piston that reciprocates in the compression chamber, and a connecting means that connects the piston and the eccentric shaft portion, wherein the balance weight includes a weight portion and a fixed portion, and the fixed portion is the eccentric shaft. It is arranged on the main shaft part side of the part, and is adjusted so as to balance rotational unbalance of the piston, the connecting means, the eccentric shaft part, etc. by processing and removing a part of the fixed part. A hermetic compressor.   2. The hermetic compressor according to claim 1, wherein a part of an anti-eccentric shaft portion of the fixed portion or an outer edge portion of the fixed portion is processed and removed.

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