JP2008121554A - Compressor - Google Patents

Abstract

A compressor with low vibration and high productivity is provided.
A cylindrical portion 122 that is higher than the plate thickness is formed in a fixing hole of a balance weight 113 formed of a thin plate, and the balance weight is maintained while maintaining a fixing torque to an eccentric portion of a shaft 108 by the cylindrical portion 122. By reducing the weight of the main body portion by reducing the thickness of the plate 113, the eccentric weight can be reduced, the enlargement of the balance weight 113 can be suppressed, and the rotational moment of the balance weight 113 can be reduced. Therefore, the balance weight 113 can be prevented from shifting when the motor is stopped, and a compact and inexpensive compressor with small vibration can be provided.
[Selection] Figure 2

Description

  The present invention relates to low vibration of a 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, a method of using a balance weight to balance the piston, which is the main vibration source of the compressor, is effective as an elemental technology for reducing vibration.

  As a conventional compressor, there is a compressor that adjusts an unbalanced force of a compression mechanism by providing a balance weight with a substantially arc shape on a shaft (see, for example, Patent Document 1).

  The prior art compressor will be described below with reference to the drawings.

  FIG. 7 is a longitudinal sectional view of a conventional compressor, and FIG. 8 is a configuration diagram of a conventional balance weight.

  7 and 8, 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 shaft 8 has a main shaft portion 9 that is press-fitted and fixed to the rotor 4, and an eccentric portion 10 that is formed eccentrically with respect to the main shaft portion 9, a block 14 has a substantially cylindrical cylinder 15, and a piston 16 is a cylinder 15 is inserted in a reciprocally slidable manner and is connected to the eccentric portion 10 by a connecting means 17.

  The shaft 8 includes a main shaft portion 9 and an eccentric portion 10. A step portion 11 smaller than the outer diameter of the eccentric portion 10 is formed above the eccentric portion 10, and the inner diameter of the step portion 11 is the step portion 11. A substantially arc-shaped balance weight 13 smaller than the outer diameter is press-fitted and fixed.

  The balance weight 13 presses a single plate and forms a substantially annular main body portion 18 and a weight portion 19 at the same time. The weight portion 19 is folded and overlapped, and the overlapping portions are caulked and joined. The fixing hole 20 of the main body portion 18 is press-fitted and fixed to the step portion 11 of the shaft 8.

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

  The rotor 4 of the electric element 5 rotates the shaft 8, and the rotational movement of the eccentric part 10 is transmitted to the piston 16 via the connecting means 17, so that the piston 16 reciprocates in the cylinder 15. As a result, the refrigerant gas 2 is sucked into the cylinder 15 from the cooling system (not shown) and compressed, and then discharged to the cooling system again.

When this compression action is performed, the piston 16 reciprocates to generate a reciprocating inertial force that is an unbalanced force. The reciprocating inertia force is balanced by providing a balance weight 13 so as to be in an opposite phase to the piston 16, and the vibration is reduced by canceling out the reciprocating inertia force of the piston 16 in the horizontal direction.
JP 2002-70740 A

  However, in the above-described conventional configuration, the balance weight main body portion is press-fitted and fixed to the eccentric portion of the shaft. Therefore, it is necessary to secure a press-fitting length necessary for obtaining a fixing force, and the balance weight is increased in thickness. There was a need. Therefore, in addition to the weight of the eccentric part, the weight of the main body part of the balance weight is added as the eccentric weight, and the eccentric weight is increased accordingly.

  However, when the eccentric weight becomes heavier, the weight of the weight part of the balance weight increases and becomes large in order to balance the unbalanced force of the sum of the eccentric weight of the shaft eccentric part and the balance weight. However, since the rotational moment of the balance weight is large, there is a possibility that the balance weight is shifted with respect to the eccentric portion of the shaft and vibration is increased.

  Also, if the thickness of the balance weight 13 is reduced in order to reduce the eccentric weight, the force (fixing torque) for fixing the balance weight to the shaft decreases, and when the compressor stops suddenly, the eccentric portion of the shaft On the other hand, there is a possibility that the balance weight rotates due to rotation of the balance weight, or the balance weight rotates and the fixation position shifts even during operation of the compressor.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a compressor that reduces the eccentric weight and realizes downsizing and low vibration.

  In order to solve the above-described conventional problems, the compressor according to the present invention includes a balance weight having a body portion in which a weight portion and a fixing portion are integrally formed of a thin plate, and a cylindrical portion fitted into an eccentric portion in the fixing portion. This is a projecting part that reduces the eccentric weight by reducing the weight of the fixed part of the balance weight while maintaining the fixing torque to the eccentric part. It has the effect | action that a rotational moment can be reduced.

  The compressor of the present invention reduces the eccentric weight by reducing the weight of the fixed portion of the balance weight while maintaining the fixed torque to the eccentric portion, and suppresses the enlargement of the balance weight and the rotation of the balance weight. Since the moment can be reduced, it is possible to prevent the balance weight from shifting when the compressor is operated or stopped, and to provide a compact and inexpensive compressor with small vibration.

  The invention according to claim 1 of the present invention includes a compression element and an electric element in a sealed container, and the compression element includes a shaft having a main shaft portion and an eccentric portion, a block forming a cylinder, and the cylinder. A piston that reciprocates inside, a connecting means that connects the piston and the eccentric part, and a balance weight fixed to the eccentric part, wherein the balance weight is integrally formed of a thin plate with the weight part and the fixed part The fixed portion is provided with a cylindrical portion that is fitted into the eccentric portion, and the balance weight of the balance weight is maintained while maintaining the fixing torque to the shaft eccentric portion by the cylindrical portion of the balance weight. By reducing the thickness of the main body by reducing the plate thickness, the eccentric weight is reduced, the balance weight is not enlarged, and the rotation weight of the balance weight is reduced. It is possible to reduce, such as when the compressor stops can be prevented that the balance weight is shifted, it is possible to provide an inexpensive compressor vibrations in small size.

  The invention according to claim 2 is the invention according to claim 1, wherein the cylindrical portion is formed by burring, and when forming the balance weight with a thin plate, the cylindrical portion can be simultaneously formed. In addition to the effect of the first aspect of the invention, the balance weight can be easily manufactured, and a highly productive and inexpensive compressor can be provided.

  The compressor according to claim 3 is the compressor according to claim 1, wherein a counterweight is added to the weight portion, and the unbalanced force of the compressor is canceled in order to cancel out the unbalanced force that varies depending on the compressor. Therefore, in addition to the effect of the invention of claim 1, the balance weight corresponding to each compressor can be easily manufactured and the productivity can be improved. A high-priced and inexpensive compressor can be provided.

  According to a fourth aspect of the present invention, in the compressor according to the first or second aspect, the protrusion is provided on the inner diameter of the cylindrical portion, and the notch corresponding to the protrusion is recessed on the inner diameter of the eccentric portion. Even if the fixed torque that fixes the balance weight to the eccentric part decreases due to a sudden stop due to extremely high speed operation or for some reason, the balance weight protrusion will become a notch in the shaft eccentric part. Since it is always locked, it is possible to reliably prevent the balance weight from shifting, and in addition to the effect of the invention according to claim 1 or 2, it is possible to provide an inexpensive compressor with further reduced vibration. it can.

  In the compressor according to claim 5, in the invention according to claim 1, ribs are formed on the outer peripheral portion of the main body, and the thin plate can be prevented from being bent or warped. The center of gravity position in the direction of gravity can be prevented from shifting, and in addition to the effect of the invention of claim 1, an increase in vibration due to a shift in the center of gravity position of the counterweight can be prevented, and further vibration can be reduced. .

  According to a sixth aspect of the present invention, in the first aspect of the present invention, the fitting direction of the balance weight to the eccentric portion coincides with the direction in which the cylindrical portion protrudes, and the lower end surface of the balance weight is gravity. Since the distance from the piston is increased in the direction, it is not necessary to change the fixed position of the balance weight upward even if the piston diameter is large, and even if the balance weight is bent, contact with the piston can be prevented. In addition to the effect of the first aspect of the invention, a more compact and highly reliable compressor can be provided.

  According to a seventh aspect of the present invention, there is provided the compressor according to the first aspect, wherein the cylindrical portion is shrink-fitted or welded to the eccentric portion, and the balance weight cylinder is inserted when the fixing portion is inserted into the eccentric portion. Since there is a clearance between the portion and the eccentric portion, no load is applied during the insertion operation. Therefore, in addition to the effect of the first aspect of the invention, the insertion operation is facilitated and the workability can be further improved.

  The compressor according to claim 8 is the compressor according to claim 1, wherein the balance weight is a hot-rolled steel plate or a cold-rolled steel plate, and the balance weight is formed from an iron plate material having little variation in thickness. Since the weight variation of the balance weight itself can be reduced, a compressor with higher productivity and less vibration variation can be provided in addition to the effect of the invention of claim 1.

  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 longitudinal sectional view of a compressor according to Embodiment 1 of the present invention, FIG. 2 is an essential part assembly diagram according to the same embodiment, and FIG. 3 is a configuration diagram of a balance weight according to the same embodiment.

  In FIG. 1 to FIG. 3, an airtight 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 include: A plurality of suspension springs 107 are elastically accommodated.

  The block 115 forms a substantially cylindrical cylinder 116, and a piston 117 is inserted into the cylinder 116 so as to be freely slidable. The piston 117 is connected to the eccentric part 110 of the shaft 108 by connecting means 118.

  The shaft 108 has a main shaft portion 109 press-fitted or shrink-fitted and fixed to the rotor 104, and an eccentric portion 110 formed eccentrically with respect to the main shaft portion 109. A stepped portion 111 into which the fixing hole 120 of the balance weight 113 is inserted and fixed is formed above the eccentric portion 110 of the shaft 108, and the outer diameter of the stepped portion 111 is smaller than that of the eccentric portion 110.

  In addition, a notch portion 128 in which a protrusion 127 of a balance weight 113 (to be described later) is fitted is provided on the upper portion of the stepped portion 111.

  The balance weight 113 includes a body portion 123 in which a weight portion 126 and a fixing hole 120 as a fixing portion are integrally formed of a thin plate. Further, a cylindrical portion 122 that forms a fixing hole 120 that is fitted into the stepped portion 111 of the eccentric portion 110 is projected by burring, and a protruding portion 127 that protrudes from the inner diameter of the cylindrical portion 122 is projected. A notch 128 corresponding to the protrusion 127 is recessed and fitted.

  Here, the burring process is a method in which a pilot hole is formed in a thin plate in advance, and a cylindrical shape is raised perpendicularly to the thin plate by pressing.

  Further, a counterweight 129 is added to the weight portion 126 of the main body portion 123 by projection welding.

  The balance weight 113 is shrink-fitted into the eccentric portion by the cylindrical portion 122 forming the fixed hole 120, and the balance weight 113 is a hot rolled steel plate or a cold rolled steel plate.

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

  The rotor 104 of the electric element 105 rotates the shaft 108, and the rotational movement of the eccentric part 110 is transmitted to the piston 117 via the connecting means 118, so that the piston 117 reciprocates in the cylinder 116. As a result, the refrigerant gas 102 is sucked and compressed from the cooling system (not shown) into the cylinder 116 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 117. However, the balance weight 113 cancels the reciprocating inertia force of the piston 117 in the horizontal direction to reduce the vibration.

  Next, fixing of the balance weight 113 and the eccentric part 110 of the shaft 108 will be described.

  Before the balance weight 113 is inserted into the stepped portion 111 of the eccentric portion 110, the balance weight 113 is heated to about 800 ° C. by high frequency induction heating or the like. After the size becomes smaller than the outer diameter of the eccentric portion 110, the balance weight 113 is inserted to a position where it comes into contact with the upper portion of the eccentric portion 110. That is, since the inner diameter of the fixing hole 120 is smaller than the outer diameter of the eccentric part 110, the fixing hole 120 is not inserted at a position above the eccentric part 110.

  After the insertion, the balance weight 113 is returned to its original size by cooling the balance weight 113 using an air brush or the like. Since the inner diameter of the balance weight 113 before heating is smaller than the outer diameter of the stepped portion 111, the inner diameter of the balance weight 113 is reduced and tightened in the radial direction with cooling. As a result, the balance weight 113 is shrink-fitted and fixed to the stepped portion 111.

  At this time, since the cylindrical portion 122 formed in the fixing hole 120 of the balance weight 113 has a longer distance in the insertion direction than the plate thickness T, even if a thin plate of about 1.5 to 2.0 mm is used for the balance weight 113, A sufficient contact area with the stepped portion 111 can be secured, and the fixing torque is greatly increased.

  The fixing torque referred to here is a fixing force for fixing the balance weight 113 to the step portion 111 of the shaft 108. In particular, since it is necessary to prevent the balance weight 113 from rotating with respect to the stepped portion 111, this is a fixing force for fixing the balance weight 113 to the stepped portion 111 of the shaft 108 and preventing rotational deviation.

  For example, when the fixing hole 120 is formed by press punching or the like, a part of the inner diameter portion of the fixing hole 120 has a broken surface, and a sufficient contact area cannot be secured, so that the fixing torque may not be stable. Thus, the cylindrical portion 122 can be formed in the fixing hole 120 without forming a fracture surface, and the fixing torque is stably increased.

  The operation and action of the balance weight 113 configured as described above will be described below.

  The reciprocating inertia force, which is an unbalanced force generated by the reciprocating motion of the piston 117, is balanced by providing a balance weight 113 so as to be in the opposite phase to the piston 117, and the reciprocating inertia force of the piston 117 in the horizontal direction is offset. This reduces the vibration.

  However, if the thin plate of the balance weight 113 is thick and the eccentric weight that is eccentric with respect to the rotation axis of the shaft 108 is large, a part of the weight of the main body 123 of the balance weight 113 is eccentric in addition to the weight of the eccentric portion 110. It is added as weight, and the eccentric weight becomes heavier than necessary.

  Therefore, the weight of the weight portion 126 of the balance weight 113 is increased and the size of the balance weight 113 is increased and the compressor is suddenly stopped in order to balance the unbalanced force of the sum of the eccentric weights of the eccentric portion 110 and the main body portion 123 of the balance weight 113. In such a case, since the rotational moment 140 of the weight portion 126 of the balance weight 113 is large, the balance weight 113 rotates with respect to the eccentric portion 110, and the balance weight 113 deviates from a predetermined position fixed at the time of assembly. There is.

  However, by forming the main body 123 of the balance weight 113 with a thin plate, the eccentric weight can be reduced. Therefore, the weight of the weight 126 can be reduced, and the weight 126 of the balance weight 113 can be reduced when the compressor suddenly stops. Since the rotational moment 140 can be reduced, it can be firmly held at a predetermined position during assembly.

  Therefore, the balance weight can be prevented from shifting when the compressor is stopped, and the compressor can be reduced in vibration.

  Furthermore, since the eccentric weight can be reduced by adopting a thin plate, the weight of the weight portion 126 for balancing with the unbalanced force of the total eccentric weight can be reduced. In other words, since the weight portion 126 can be made smaller and the radius of rotation can be made smaller, the gap between the balance weight 113 and the block 115 becomes larger, the block can be made smaller by the obtained gap, and the compressor can be made smaller. Furthermore, since the amount of material used for the balance weight 113, the block 115, and the sealed container 101 can be reduced, a more inexpensive compressor can be obtained.

  Further, the cylindrical portion 122 of the balance weight 113 is formed by burring, and a protruding portion 127 protruding to the inner diameter side of the cylindrical portion 122 is also formed at the same time. Since the eccentric part 110 is provided with a notch part 128 corresponding to the projection part 127, the eccentric part 110 is suddenly stopped from an extremely high speed operation due to a power failure or the like, or the step part 111 is insufficiently balanced or has a balance due to processing failure. When the fixing torque of the weight 113 with respect to the stepped portion 111 is lowered, even if the balance weight 113 tries to shift in the rotational direction around the eccentric portion 110, the protruding portion 127 and the cutout portion 128 are locked. The balance weight 113 can be prevented from shifting from a predetermined position.

  Therefore, an increase in vibration due to the shift of the balance weight 113 can be prevented, and a low-cost and inexpensive compressor can be obtained.

  Further, since the cylindrical portion 122 is subjected to burring after being punched out by pressing so that the protruding portion 127 can be formed in the direction toward the central axis of the eccentric portion 110, the protruding portion 127 becomes the central axis of the cylindrical portion 122 immediately after burring processing. Since the protrusion 127 can be formed simply by bending the protrusion 127 by 90 ° in the direction of the central axis of the cylindrical portion 122 after burring, it is easy to process and increases productivity. be able to.

  Furthermore, the compressor needs to change the weight of the balance weight 113 and give an inertia moment according to the unbalanced force of the compressor, but the balance weight 113 adds a counterweight 129 to the main body 123 by projection welding or the like. Thus, the moment of inertia according to the unbalanced force of the compressor can be given, and it is not necessary to produce dedicated parts according to the unbalanced force of the compressor, and the productivity can be further increased.

  Note that as a method of attachment other than welding of the counterweight 129, productivity can be similarly increased by a method of caulking a pin through a hole penetrating the main body and the counterweight 129 using a caulking pin or the like.

  Further, since the electric element 105 and the compression element 106 are elastically supported by the suspension spring 107 in the hermetic container 101, in addition to the swinging motion in the rotation direction, the swinging motion is performed with the suspension spring 107 as a base point. Do it. Even in such a swinging motion, the rib 133 formed by bending the outer peripheral portion 130 is formed on the outer peripheral portion 130 of the main body portion 123, so that the thin plate of the balance weight 113 bends or warps. Therefore, it is possible to prevent an increase in vibration due to a shift in the center of gravity position of the balance weight 113 and further reduce the vibration.

  In addition, as a method of fixing the balance weight 113 to the stepped portion 111, the stepped portion 111 and the cylindrical portion 122 are set as interference fit dimensions and are shrink-fitted and fixed, so that the cylindrical portion 122 is inserted into the stepped portion 111. Since no load is sometimes applied, the insertion work is facilitated, and the workability can be further improved.

  Further, as a method for fixing the balance weight 113 to the stepped portion 111, the stepped portion 111 and the cylindrical portion 122 may be dimensioned so as to be loosely fitted, and the cylindrical portion 122 may be welded and fixed after being inserted into the stepped portion 111. By fixing it, it becomes possible to hold it in place more firmly and, like shrink fitting, no load is applied during the operation of inserting the cylindrical portion 122 into the stepped portion 111, so that the insertion operation can be performed. It becomes easy.

  In addition, as a method of fixing the balance weight 113 to the stepped portion 111, the cylindrical portion 122 may be press-fitted and fixed to the stepped portion 111, and the stepped portion 111 and the cylindrical portion 122 can be firmly held at a predetermined position. .

  Furthermore, the balance weight 113 is formed of a hot-rolled steel plate or a cold-rolled steel plate. However, since the hot-rolled steel plate or the cold-rolled steel plate has a small thickness variation, the balance weight 113 itself has a small mass variation. A stable vibration reduction effect can be obtained. Further, the cylindrical portion 122 of the fixing hole 120 can be easily formed, and is inexpensive and excellent in workability.

(Embodiment 2)
4 is a longitudinal sectional view of the compressor according to the second embodiment of the present invention, FIG. 5 is an essential part assembly diagram according to the same embodiment, and FIG. 6 is a configuration diagram of a balance weight according to the same embodiment.

  4 to 6, the hermetic container 201 is filled with the 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 include: A plurality of suspension springs 207 are elastically accommodated.

  The block 215 forms a substantially cylindrical cylinder 216, and a piston 217 is inserted into the cylinder 216 so as to be slidable back and forth. The piston 217 is connected to the eccentric part 210 of the shaft 208 by connecting means 218.

  The shaft 208 includes a main shaft portion 209 that is press-fitted or shrink-fitted and fixed to the rotor 204, and an eccentric portion 210 that is formed eccentric to the main shaft portion 209. A stepped portion 211 into which the fixing hole 220 of the balance weight 213 is inserted and fixed is formed above the eccentric portion 210 of the shaft 208, and the outer diameter of the stepped portion 211 is smaller than that of the eccentric portion 210.

  The balance weight 213 includes a main body portion 223 in which the weight portion 226 and the fixing hole 220 are integrally formed of a thin plate. Furthermore, the cylindrical part 222 inserted in the level | step-difference part 211 of the eccentric part 210 is protrudingly provided by the burring process.

  Here, the burring process is a method in which a pilot hole is formed in a thin plate in advance, and a cylindrical shape is raised perpendicularly to the thin plate by pressing.

  Further, a counterweight 229 is added to the weight portion 226 of the main body portion 223 in a direction opposite to the projecting direction of the cylindrical portion 222 by projection welding, and the fitting direction of the balance weight 213 to the eccentric portion 210 of the shaft 208 is This corresponds to the direction in which the cylindrical portion 222 protrudes.

  The balance weight 213 is shrink-fitted into the eccentric portion by the fixing hole 220, and the balance weight 213 is a hot rolled steel plate or a cold rolled steel plate.

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

  The rotor 204 of the electric element 205 rotates the shaft 208, and the rotational movement of the eccentric part 210 is transmitted to the piston 217 via the connecting means 218, so that the piston 217 reciprocates within the cylinder 216. As a result, the refrigerant gas 202 is sucked and compressed from the cooling system (not shown) into the cylinder 216 and then discharged to the cooling system again.

  When the compression action is performed, an unbalanced force is generated by the reciprocating motion of the piston 217. However, the balance weight 213 cancels the reciprocating inertia force of the piston 217 in the horizontal direction, thereby reducing the vibration.

  Next, fixing of the balance weight 213 and the eccentric part 210 of the shaft 208 will be described.

  The balance weight 213 is heated to about 800 ° C. by high-frequency induction heating or the like before being inserted into the step portion 211 of the eccentric portion 210, and the inner diameter of the fixing hole 220 which is the fixing portion is thermally expanded by heating, so that the step portion 211. After the outer diameter of the eccentric portion 210 is larger than the outer diameter of the eccentric portion 210, the balance weight 213 is inserted into the stepped portion 211 so that the fitting direction of the balance weight 213 coincides with the protruding direction of the cylindrical portion 222. Is inserted to a position where the end surface 227 abuts on the upper portion of the eccentric portion 210. That is, since the inner diameter of the fixing hole 220 is smaller than the outer diameter of the eccentric part 210, the fixing hole 220 is not inserted at a position above the eccentric part 210.

  After insertion, the balance weight 213 is returned to its original size by cooling the balance weight 213 using an air brush or the like. Since the inner diameter of the balance weight 213 before heating is smaller than the outer diameter of the stepped portion 211, the inner diameter of the balance weight 213 is reduced in the radial direction and tightened with cooling, and as a result, it is shrink-fitted and fixed to the stepped portion 211.

  At this time, the cylindrical portion 222 formed in the fixing hole 220 of the balance weight 213 has a longer distance in the insertion direction than the plate thickness T. Therefore, even if a thin plate of about 1.5 to 2.0 mm is used for the balance weight 213, A sufficient contact area with the stepped portion 211 can be secured, and the fixing torque is greatly increased.

  The fixing torque referred to here is a fixing force for fixing the balance weight 213 to the step portion 211 of the shaft 208. In particular, since it is necessary to prevent the balance weight 213 from rotating with respect to the stepped portion 211, the balance weight 213 is fixed to the stepped portion 211 of the shaft 208, and is a fixing force for preventing rotational deviation.

  For example, when the fixing hole 220 is formed by press punching or the like, a part of the inner diameter portion of the fixing hole 220 becomes a fracture surface, and a sufficient contact area cannot be secured, so that the fixing torque may not be stable. Thus, the cylindrical portion 122 can be formed in the fixing hole 220 without forming a fracture surface, and the fixing torque is stably increased.

  The operation and action of the balance weight 213 configured as described above will be described below.

  The reciprocating inertia force, which is an unbalanced force generated by the reciprocating motion of the piston 217, is balanced by providing a balance weight 213 so as to be in an opposite phase to the piston 217, thereby canceling the reciprocating inertia force of the piston 217 in the horizontal direction. This reduces the vibration.

  Further, the fitting direction of the balance weight 213 to the stepped portion 211 is made to coincide with the direction in which the cylindrical portion 222 protrudes, and the counterweight 229 is attached to the main body portion 223 opposite to the protruding direction of the cylindrical portion 222. As a result, the lower end surface of the balance weight 213 is upward in the gravity direction, and the distance from the piston 217 is increased.

  Therefore, it is not necessary to change the position of the stepped portion 211 and change the fixed position of the balance weight 213 upward when the outer diameter of the piston 217 is increased in order to obtain a large refrigeration capacity as a compressor. Even when producing compressors having different refrigeration capacities, the balance weight 213 can be shared and used, and high productivity can be obtained at low cost.

  Furthermore, even if the balance weight 213 is bent, the distance to the piston 217 is long, so that contact with the piston 217 can be prevented, and noise and operation stop due to contact can be prevented. It can be a high compressor.

  As described above, the compressor according to the present invention enables a low-vibration and low-cost compressor while ensuring high productivity, so that it can be used in home refrigerators, dehumidifiers, showcases, vending machines, etc. It can be applied to a compressor used in a refrigeration cycle.

The longitudinal cross-sectional view of the compressor in Embodiment 1 of this invention Main part assembly drawing in the same embodiment Configuration diagram of balance weight in the same embodiment The longitudinal cross-sectional view of the compressor in Embodiment 2 of this invention Main part assembly drawing in the same embodiment Configuration diagram of balance weight in the same embodiment Vertical section of a conventional compressor Configuration diagram of conventional balance weight

Explanation of symbols

101, 201 Sealed container 105, 205 Electric element 106, 206 Compression element 108, 208 Shaft 109, 209 Main shaft part 110, 210 Eccentric part 113, 213 Balance weight 115, 215 Block 116, 216 Cylinder 117, 217 Piston 118, 218 Connection Means 120, 220 Fixed hole 122, 222 Cylindrical portion 123, 223 Main body portion 126, 226 Weight portion 127 Projection portion 128 Notch portion 129, 229 Counterweight 133 Rib

Claims (8)

  A closed container includes a compression element and an electric element. The compression element includes a shaft having a main shaft portion and an eccentric portion, a block forming a cylinder, a piston reciprocating in the cylinder, the piston, and the piston. A connecting means for connecting the eccentric part; and a balance weight fixed to the eccentric part, wherein the balance weight has a main body part integrally formed of a thin plate with the weight part and the fixed part. A compressor having a cylindrical portion projecting from the eccentric portion.   The compressor according to claim 1, wherein the cylindrical portion is formed by burring.   The compressor according to claim 1, wherein a counterweight is added to the weight portion.   The compressor according to claim 1 or 2, wherein a protrusion is provided on the inner diameter of the cylindrical portion, and a notch corresponding to the protrusion is recessed on the inner diameter of the eccentric portion.   The compressor according to claim 1, wherein a rib is formed on an outer peripheral portion of the main body portion.   The compressor according to claim 1, wherein a fitting direction of the balance weight to the eccentric part coincides with a direction in which the cylindrical part protrudes.   The compressor according to claim 1, wherein the cylindrical portion is shrink-fitted or welded to the eccentric portion.   The compressor according to claim 1, wherein the balance weight is a hot-rolled steel plate or a cold-rolled steel plate.

Images