JP2006009682A - Hermetic electric compressor - Google Patents

Abstract

An object of the present invention is to improve the assembly workability of a compressor and reduce noise.
An electric element 120, a discharge pipe 134, etc. are directly connected to the inside of the hermetic container 101 by providing a protective plate 140 projecting outside the outer diameter of the stator 124 on the upper end surface of the stator 124 on the side opposite to the compression element. It can be prevented from hitting the wall surface, the centering of the crankshaft 116 can be simplified, the assembly workability of the compressor can be improved, and the noise can be reduced without generating abnormal noise. It can be planned.
[Selection] Figure 1

Description

  The present invention relates to a reduction in the occurrence of abnormal noise in a hermetic electric compressor (hereinafter referred to as a compressor).

  Conventionally, in this type of compressor, a crank stopper for inserting an upper end portion of a crankshaft connecting an electric element and a compression element is generally attached to an inner surface top surface portion of an upper container (for example, a patent) Reference 1).

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

  4 is a cross-sectional view showing a conventional compressor described in Patent Document 1, and FIG. 5 is a top view showing the conventional compressor described in Patent Document 1. As shown in FIG.

  4 and 5, the sealed container 1 is formed of an upper container 2 and a lower container 3 formed by drawing a steel plate.

  The compression element 5 includes a block 8 that forms a cylinder 7, a piston 10 that is reciprocally fitted in the cylinder 7, and a crank that includes a main shaft portion 12 and an eccentric portion 14 that are supported by a bearing portion 9 of the block 8. The shaft 16, the eccentric portion 14, and a connecting rod 18 that connects the piston 10 are provided to form a reciprocating compression element.

  The electric element 20 is composed of a stator 24 and a rotor 26 provided with a winding 22 fixed above the block 8. The rotor 26 is fixed to the main shaft portion 12 of the crankshaft 16 by shrink fitting or the like.

  The plurality of springs 30 elastically support the electric compression element 32 including the electric element 20 and the compression element 5 in the sealed container 1. The electric compression element 32 is connected to the lower container 3 by welding or the like by an elastic discharge pipe 34.

  The upper container 2 includes a crank stopper 36 into which the tip contact portion 35 of the crankshaft 16 is inserted. The crank stopper 36 includes a cylindrical side surface portion 37 and a bottom surface portion 38 formed by drawing a steel plate, and the bottom surface portion 38 is fixed to the top surface portion inside the upper container 2 by resistance welding.

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

  Supplying electricity to the electric element 20 causes the crankshaft 16 to rotate, and the eccentric movement of the eccentric portion 14 performs a compression operation by reciprocating the piston 10 in the cylinder 7 via the connecting rod 18. The refrigerant compressed in 7 passes through the discharge pipe 34 and is supplied to a refrigeration cycle (not shown) connected to the sealed container 1.

  Since the rotational fluctuation is large when the compressor is started and stopped, the electric compression element 32 swings in the sealed container 1 in the axial direction perpendicular to the rotation axis of the crankshaft 16, and similarly the tip contact portion 35 of the crankshaft 16. Also swings around in the crank stopper 36. If the runout becomes too large due to the load conditions at the start and stop of the compressor, the tip abutting portion 35 of the crankshaft 16 is moved before the electric element 20, the discharge pipe 34, etc. hit the inner wall surface of the sealed container 1. It is possible to prevent the electric element 20, the discharge pipe 34 and the like from directly hitting the inner wall surface of the sealed container 1 by hitting the cylindrical side surface portion 37 of the stopper 36 first. Next, when the compressor is transported, the electric compression element 32 is elastically held by the plurality of springs 30 and thus vibrates in the sealed container 1 due to vibration during transportation. At this time, the tip contact portion 35 of the crankshaft 16 contacts the bottom surface portion 38 and the cylindrical side surface portion 37 of the crank stopper 36, thereby preventing the electric element 20, the discharge pipe 34, and the like from directly contacting the inner wall surface of the sealed container 1. . Further, the electric compression element 32 is prevented from being detached from the plurality of springs 30.

  Next, the process of assembling the compressor will be described.

A crank stopper 36 is fixed to the upper container 2 of the hermetic container 1 from the inside in advance at a substantially center position on the top surface of the upper container 2 by resistance welding. Next, the electric element 20 and the compression element 5 are assembled together, loaded into the lower container 3 constituting the sealed container 1 via a plurality of springs 30, and the discharge pipe 34 is connected to the lower container 3 by welding or the like. Thereafter, the tip contact portion 35 of the crankshaft 16 is aligned with the approximate center position of the cup-shaped crank stopper 36 welded to the upper container 2 by the operator's centering operation. Finally, the upper container 2 is fitted into the lower container 3 in which the electric compression element 32 is loaded, and the joint is welded all around. Further, the centering work is usually performed only by shaping the discharge pipe 34 by manual work of a skilled worker.
JP-A-11-303740

  However, in the above-described conventional configuration, when an external impact is applied during operation of the compressor, the elastically supported electric compression element 32 is shaken, and the tip contact portion 35 of the crankshaft 16 becomes the cylindrical side surface portion 37 of the crank stopper 36. In such a case, rolling occurs while contacting along the cylindrical side surface portion 37 of the crank stopper 36, and abnormal noise may be generated.

  Further, when the compressor is installed at an inclination, the electric compression element 32 is elastically supported, so that the electric compressor is further inclined within the hermetic container 1, and therefore the tip contact portion 35 of the crankshaft 16. And the cylindrical abutting side surface 37 of the crank stopper 36 are secured to the center of the cup-shaped crank stopper 36 welded to the upper container 2 so that the tip end abutting portion 35 of the crankshaft 16 is secured in any direction. It is matched.

  The operation of adjusting to the substantially center position is to manually shape and adjust the discharge pipe 34 connected to the lower container 3 by welding or the like and restraining the electric compression element 32, which requires skill and labor. The assembly cycle time cannot be shortened.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a compressor with good workability and low noise.

  In order to solve the above-described conventional problems, the compressor of the present invention is provided with a protective plate protruding outward from the outer diameter of the stator at the upper end surface on the side opposite to the compression element of the stator, and has no crank stopper. Therefore, the crankshaft tip abutting portion rolls while contacting in the crank stopper and does not generate abnormal noise, and the centering of the crankshaft can be simplified.

  In the compressor according to the present invention, the centering of the crankshaft can be simplified, so that the workability is good and no abnormal noise is generated.

  The invention according to claim 1 includes a compression element elastically supported in a sealed container, and an electric element that is disposed above the compression element and includes a stator and a rotor. There is a protective plate over the outside diameter of the stator above the element side end face. Since there is no crank stopper, the crankshaft tip contact part rolls while contacting within the crank stopper Therefore, workability is good because the center of the crankshaft can be simplified.

  The invention according to claim 2 is the protective plate according to claim 1, which is stamped and formed from an iron plate. The protective plate can be created by a single press process, the molding process is simplified, and capital investment is suppressed. Therefore, the cost can be further reduced in addition to the effect of the invention of the first aspect.

  The invention according to claim 3 is the protection plate according to claim 2, wherein the protection plate is formed from a surplus material obtained by punching the blank material of the sealed container, and the protection plate can be made from the surplus material and purchase of materials. Therefore, the cost can be further reduced in addition to the effect of the invention of the second aspect.

  According to a fourth aspect of the present invention, a tip abutting portion that hits the top surface of the upper container is provided near the upper end of the crankshaft constituting the compression element according to the first to third aspects. When the top and bottom of the crankshaft hits the top surface of the upper container when the top and bottom vibrations occur in the direction, the movement is restricted, preventing the electric element, discharge pipe, etc. from directly hitting the inner wall of the sealed container. Since the compression element can be prevented from coming off from the spring, a highly reliable compressor is provided in addition to the effects of the inventions of claims 1 to 3.

  According to a fifth aspect of the present invention, the crankshaft constituting the compression element according to the fourth aspect is such that the tip abutting portion that contacts the top surface portion of the upper container has a spherical shape, and the crankshaft is formed on the top surface portion of the upper container. Even if the front end contact portion of the crankshaft hits, the top end contact portion of the crankshaft is less likely to damage the top surface portion of the upper container, and generation of iron powder or the like can be prevented. In addition to the invention of claim 4, the reliability is further improved. Can be improved.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a sectional view of a compressor according to an embodiment of the present invention, FIG. 2 is a top sectional view of the compressor according to the embodiment, and FIG. 3 is a plan view showing material removal according to the embodiment. is there.

  1, 2, and 3, the sealed container 101 is formed of an upper container 102 and a lower container 103 formed by drawing a steel plate.

  The compression element 105 includes a block 108 that forms a cylinder 107, a piston 110 that is reciprocally fitted in the cylinder 107, and a crank that includes a main shaft portion 112 and an eccentric portion 114 that are supported by a bearing portion 109 of the block 108. A reciprocating compression element is formed by including a shaft 116, a connecting rod 118 that connects the eccentric portion 114 and the piston 110.

  The crankshaft 116 is provided with a tip contact portion 135 that hits the upper inner surface of the upper container 102 in the vicinity of the upper end, and the upper end surface of the tip contact portion 135 is processed into a spherical shape.

  The electric element 120 includes a stator 124 and a rotor 126 which are disposed above the block 108 and are provided with windings 122. The rotor 126 is fixed to the main shaft portion 112 of the crankshaft 116 by shrink fitting or the like.

  The electric compression element 132 including the electric element 120 and the compression element 105 is elastically supported in the sealed container 101 via a plurality of springs 130. The electric compression element 132 is connected to the lower container 3 by a discharge pipe 34 having elasticity.

  A protection plate 140 is fixed to the upper end surface of the anti-compression element of the stator 124. The protection plate 140 has a flat plate shape, the crankshaft 116 side has a shape along the outer peripheral shape of the winding 122, the sealed container 101 side of the protection plate 140 has a shape along the inner wall surface of the upper container 102, and both ends The part has a loose protrusion.

  Further, as shown in FIG. 3, the protective plate 140 is formed of an iron plate surplus material 146 obtained by punching a blank material 144 before press drawing of the upper container 102 and the lower container 103 forming the sealed container 101.

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

  Supplying electricity to the electric element 120 causes the crankshaft 116 to rotate, and the eccentric movement of the eccentric portion 114 performs a compression operation by reciprocating the piston 110 in the cylinder 107 via the connecting rod 118. The refrigerant compressed in 107 passes through the discharge pipe 134 and is supplied to a refrigeration cycle (not shown) connected to the sealed container 101.

  When the compressor is started and stopped, since the inertial force in the rotational direction of the electric compression element 132 is large, the electric compression element 132 swings in the sealed container 101 in the axial direction perpendicular to the rotation axis of the crankshaft 116. At this time, the protection plate 140 directly contacts the sealed container 101 with the electric element 120, the discharge pipe 134, etc. by first hitting the inner wall surface of the sealed container 101 before the electric element 120, the discharge pipe 134, etc. hits the sealed container 101. prevent. As a result, it is possible to avoid damage to the electric element 120 including the winding 122, the discharge pipe 134, and the like.

  Next, when the compressor is transported, the electric compression element 132 is elastically held by the plurality of springs 130, and therefore vibrates in the sealed container 1 due to vibration during transportation.

  At this time, the tip contact portion 135 of the crankshaft 116 contacts the inner wall surface of the upper container 102 to restrict the vertical movement of the electric compression element 132, while the protective plate 140 contacts the inner wall surface of the sealed container 101. The movement in the axial direction perpendicular to the rotation axis 116 is restricted. As a result, the electric element 120, the discharge pipe 134, and the like are prevented from directly contacting the sealed container 101, thereby avoiding damage to the electric element 120, the discharge pipe 134, etc. including the winding 122, and the electric compression element 132. Is prevented from coming off from the plurality of springs 130.

  Here, since the upper end surface of the tip contact portion 135 of the crankshaft 116 is spherical, even if the tip contact portion 135 of the crankshaft 116 hits the inner wall surface of the upper container 102, the tip contact portion 135 of the crankshaft. However, it becomes difficult to damage the inner wall surface of the upper container 102, and higher reliability can be obtained by preventing the generation of iron powder or the like.

  Furthermore, when an external impact is applied during the operation of the compressor, the tip contact portion 135 of the crankshaft 116 does not have a counterpart that swings in the axial direction perpendicular to the rotation axis of the crankshaft 116. There is no abnormal noise generated by rolling while contacting. Therefore, it is possible to provide a low noise compressor that does not generate abnormal noise.

  Further, since the upper container 102 does not include a crank stopper for inserting the tip contact portion 135 of the crankshaft 116, the so-called centering that aligns the axis of the tip contact portion 135 of the crankshaft 116 with the axis of the crank stopper. No need for work. As a result, it is possible to simplify the centering operation which requires skill and labor, so that the assembly cycle time can be shortened.

  Further, since the protective plate 140 is formed from an iron plate surplus material 146 obtained by punching the blank material 144 before press drawing of the upper container 102 and the lower container 103 forming the sealed container 101, purchase of a new iron plate member is performed. Is unnecessary, and the cost can be further reduced.

  As described above, according to the present embodiment, it is possible to provide a compressor with good workability, low cost, and low noise.

  As described above, the compressor according to the present invention can provide a highly reliable compressor that has good workability, can shorten the assembly cycle time, and does not easily generate abnormal noise. It can also be applied to applications such as freezer showcases and dehumidifiers.

Sectional view of an embodiment of a compressor according to the invention Top view sectional view of the compressor of the embodiment Plan view showing material removal of the embodiment Cross section of a conventional compressor Top view of a conventional compressor

Explanation of symbols

101 Sealed Container 105 Compression Element 116 Crankshaft 120 Electric Element 124 Stator 126 Rotor 135 Tip Contact 140 Protection Plate

Claims (5)

  A compression element elastically supported in a hermetic container; and an electric element disposed on an upper portion of the compression element and including a stator and a rotor. Hermetic type electric compressor provided with a protective plate projecting outside the outer diameter of the.   The hermetic electric compressor according to claim 1, wherein the protective plate is stamped and formed from an iron plate.   The hermetic electric compressor according to claim 2, wherein the protective plate is formed from a surplus material obtained by punching a blank material of the hermetic container.   4. The hermetic electric compressor according to claim 1, wherein a tip abutting portion that hits an upper inner surface of the hermetic container is provided in the vicinity of the upper end of the crankshaft constituting the compression element.   The hermetic electric compressor according to claim 4, wherein an upper end surface of the tip contact portion is spherical.

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