JP5788305B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compressor used in a refrigeration air conditioner and the like, and more particularly to an electric compressor provided with an accumulator.

  As a conventional electric compressor, what is described in the following patent document 1 is already known. In such a conventional electric compressor, an accumulator is coupled to and supported by the compressor, but the structure is such that a plate-like member is supported and fixed by a long joint fixed to the outer periphery of the compressor. Thus, by increasing the rigidity of the accumulator, the vibration of the accumulator due to the propagation of vibration from the compressor is reduced. In addition, the connection part of two places with the accumulator of a plate-shaped member is extended substantially parallel here.

Japanese Unexamined Patent Publication No. 2011-127463

  However, the conventional accumulator fixing structure described above is not sufficient for the force that vibrates the accumulator in the tangential direction. In particular, in a one-cylinder rotary compressor, the discharge per rotation is one time, and the fluctuation However, this propagates to the accumulator, causing the accumulator to vibrate in the tangential direction, which increases the vibration and noise of the compressor, and further increases the vibration and noise of the unit on which the compressor is mounted. In addition, fluctuations also occur in rotary compressors and scroll compressors having a plurality of cylinders, and as with the above, this also increases the vibration and noise of the compressor, and hence the vibration and noise of the unit on which the compressor is mounted. It was the cause of the increase in noise.

  In addition, in order to reduce this, a method has also been attempted in the past, in which a cushioning material such as rubber is sandwiched between the accumulator and the plate-like member and fastened with a band and a screw, but the number of parts and the cost increase. Was invited. In addition, in the case of employing welding, if it is attempted to increase the rigidity by increasing the plate thickness or component dimensions of the plate-like member, an increase in cost and weight becomes a problem.

  Therefore, the present invention has been achieved to solve the above-described conventional problems, and the object thereof is to propagate the compressor vibration to the accumulator at a relatively low cost without increasing the number of existing components. It is an object of the present invention to provide a compressor capable of reducing noise generated by the operation.

  In order to achieve the above object, according to the present invention, first, an electric motor and a compression mechanism that is rotationally driven by the electric motor are provided in a sealed container having a substantially cylindrical shape, and the outer peripheral surface of the sealed container is provided. In the electric compressor to which the accumulator is attached, the connecting portion for attaching the accumulator to the outer peripheral surface of the closed container is partly joined to the outer peripheral surface of the closed container, and the pair of legs are connected to the accumulator. The leg portion is spread outward so as to be in a range of 26 ° to 45 ° with respect to a straight line connecting the center of the closed container and the center of the accumulator. An electric compressor is provided.

  In order to achieve the above object, according to the present invention, an electric motor and a compression mechanism that is rotationally driven by the electric motor are provided in a sealed container having a substantially cylindrical outer shape, and the outer peripheral surface of the sealed container is provided. In the electric compressor to which the accumulator is attached, the connecting portion for attaching the accumulator to the outer peripheral surface of the closed container is partly joined to the outer peripheral surface of the closed container, and the pair of legs are connected to the accumulator. There is provided an electric compressor that is joined to an outer peripheral surface of the electric compressor and that the leg portion is spread outward so as to face the center of the sealed container.

  Further, according to the present invention, in the electric compressor described above, the leg portion is preferably formed by bending a single plate-like member, or the leg portion and the outer peripheral surface of the accumulator are two. It is preferable to weld-join at a point or more. Further, the accumulator includes a pipe inside thereof, and a part of the pipe is coupled to the inner wall of the accumulator, and the position of the coupling is the height of the legs supporting the accumulator and the height direction. It is preferable that both substantially coincide in both the width direction and the width direction.

  According to the present invention described above, a compressor capable of reducing noise generated by propagation of compressor vibration to an accumulator at a relatively low cost without increasing the number of existing components is provided. It also has an excellent practical effect of making it possible.

It is a top view which shows the whole structure of the vertical rotary compressor which becomes Example 1 of this invention. It is a longitudinal cross-sectional view of the vertical rotary compressor of the present invention. It is a figure for demonstrating an example of the propagation direction of the exciting force in the vertical rotary compressor of this invention. It is a figure for demonstrating the other example of the propagation direction of the exciting force in the vertical rotary compressor of this invention. It is a figure for demonstrating an example of the propagation direction of the exciting force in the conventional vertical rotary compressor (comparative example). It is a figure which shows an example of the other structure of the welding part of a plate-shaped member and an accumulator. It is a figure which shows the attachment structure at the time of using the plate-shaped member in which the connection part curved. It is a top view which shows the whole structure of the vertical rotary compressor which becomes Example 2 of this invention. It is sectional drawing which shows the attachment structure at the time of curving the front-end | tip of the suction pipe in an accumulator.

  Hereinafter, some preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a top view of a rotary compressor according to a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the rotary compressor according to the first embodiment of the present invention. That is, in the rotary compressor of the present invention, as shown in these drawings, the electric element and the compression mechanism connected to the electric element by the crankshaft 5 are enclosed in the sealed container 1. The sealed container 1 includes a cylindrical body 1A, a lid body 1B, and a bottom body 1C. The cylindrical body 1A has a cylindrical shape with an upper and lower opening made of an iron plate. The lid body 1B and the bottom body 1C are fitted to the cylindrical body 1A, and the fitting portion is welded to seal the inside. The electric element includes a stator 3 fixed to the sealed container 1 by shrink fitting or the like, and a rotor 4 to which a crankshaft 5 is fitted. The compression mechanism section includes the main bearing 6, the crankshaft 5, the auxiliary bearing 10, the cylinder 7, the roller 11, and the vane 13 as main elements.

  The crankshaft 5 has a main bearing insertion portion 20 that is inserted into the main bearing 6 on one side, and a sub bearing insertion portion 21 that is inserted into the sub bearing 10 on the other side. Further, the crankshaft 5 is formed integrally with an eccentric portion 5A between the main bearing insertion portion 20 and the auxiliary bearing insertion portion 21. A roller 11 is rotatably fitted in the eccentric portion 5 </ b> A of the crankshaft 5. A vane 13 is fitted into the cylinder 7 so as to contact the outer periphery of the roller 11. That is, the compression mechanism portion includes therein a compression element having the eccentric portion 5A, the roller 11 fitted to the eccentric portion, and the cylinder 7 arranged so as to contact the outer periphery of the roller. .

  A main bearing insertion portion 20 and a sub bearing insertion portion 21 that support the crankshaft 5 are disposed on the outer side in the axial direction of the compression mechanism portion. By inserting the main bearing insertion portion 20 and the auxiliary bearing insertion portion 21 into the main bearing 6 and the auxiliary bearing 10, respectively, the crankshaft 5 is rotatably arranged. The cylinder 7 is fastened to the main bearing 6 by main bearing fastening bolts 15. Further, the sub bearing 10 is fastened to the cylinder 7 by the sub bearing tightening bolt 16. In addition, the outer diameter of the main bearing 6 is fixed to the cylindrical body 1 </ b> A by welding or the like, so that the compression mechanism portion is fixed in the sealed container 1. And the required quantity of refrigerating machine oil (not shown) is enclosed in the airtight container 1 of this structure.

  On the other hand, the accumulator 2 is coupled in front of the suction port 30 of the compression mechanism section, and more specifically, is coupled by welding with a plate-like member 22 coupled to the sealed container 1. Then, the refrigerant sucked into the cylinder 7 through the accumulator 2 is compressed from the suction pressure to the discharge pressure in the compression element. Thereafter, the compressed refrigerant is once discharged into the sealed container 1 and then discharged from a discharge pipe 17 installed in the sealed container 1 to a cycle such as an air conditioner. In addition, the flow path | route to the compressor of a refrigerant | coolant is shown with the arrow in a figure.

  Subsequently, as described above, an attachment structure for fixing the accumulator 2 to the outer peripheral surface of the sealed container 1 having a compression mechanism portion (that is, a vibration generation source) therein will be described in detail below.

<Vibration in the tangential direction of the accumulator>
First, the inventors of the above-described conventional mounting structure, when vibration due to the operation of the compressor is transmitted to the accumulator, most of its components are in the tangential direction, and electric compression provided with a compression mechanism that performs rotational motion. In the machine, the torque variation is caused by compressing the gas by the rotational movement of the compression mechanism, so that the tangential direction is dominant in the vibration component. That is, in particular, in a one-cylinder rotary compressor, since the discharge per revolution is one time, a large fluctuation occurs, which is propagated to the accumulator, and as a result, the accumulator is vibrated in the tangential direction. Increased vibration and noise, and in turn, increased vibration and noise of the unit equipped with the compressor. Similarly, a rotary compressor having a plurality of cylinders, a scroll compressor, and the like have also caused fluctuations that cause the accumulator to vibrate in the tangential direction.

  Therefore, the present inventors have achieved the mounting structure described in detail below based on the above-described knowledge, and the structure will be described below with reference to FIGS. Add.

  First, in the present invention, as shown in FIG. 3, the connection part (leg part) 22 </ b> A of the plate-like member 22 for attaching the accumulator 2 to the outer peripheral surface of the sealed container 1 is used as the compressor (that is, the sealed container 1). The angle with respect to a straight line connecting the center and the center of the accumulator 2 (that is, the angle “θ” in the figure) is widened outwardly to be approximately 26 °. Specifically, the plate-like member 22 such as a single steel plate is preliminarily substantially V-shaped so as to have such an angle (however, the central portion is flat or curved along the outer peripheral surface of the container). The member was attached to the outer peripheral surface of the sealed container 1 by welding, and the accumulator 2 was also attached to the pair of tip portions of the V-shaped plate-like member 22 by welding.

  When an excitation force is applied to the accumulator 2 by operating the compressor to which the accumulator 2 is attached by the plate-like member 22 described above, the excitation force propagates via the connecting portion 22A.

  At this time, according to the plate-like member 22 described above, if the excitation force is F, the excitation force F is decomposed into two forces of Fcosθ and Fsinθ by the above-described angle of the connecting portion 22A. As a result, the component Fcosθ, which is a component perpendicular to the connecting portion 22A, that is, approximately tangential to the compressor, is smaller than when the two connecting portions 22A are parallel (comparative example in FIG. 5). . Note that Fsinθ is a component that tends to be normal to the compressor.

  Furthermore, as shown in FIG. 4, when the angle “θ” is increased to approximately 45 °, the above-described tangential component becomes approximately 70% (≈F / √2).

  Here, FIG. 5 shows, as a comparative example, a substantially U-shaped plate-like member 22 having a conventional structure, that is, a structure in which the connecting portions 22A are parallel to each other (or the angle “θ” ≈0 defined above). In this case, almost all components of the excitation force F are in the tangential direction.

  As described above, according to the findings by the present inventors, the main component of the compressor vibration is the tangential component due to torque fluctuation during gas compression, and the normal component is significantly larger than that. small. Therefore, it can be seen that the increase in noise and vibration due to the resonance of the accumulator 2 can be reduced by reducing the tangential component of the vibration propagation from the compressor to the accumulator 2. That is, as a result of various experiments by the present inventors, it was found that it is particularly preferable to set the angle “θ” within a range of approximately 26 ° to 45 °.

  Further, the welded portion 22B between the accumulator 2 and the connecting portion (leg portion) 22A is, as shown in FIG. 6, a two-point or more multi-point joint, or a linear shape (not shown). It is also possible to increase the rigidity by welding.

  In addition, the welded portion 22B between the accumulator 2 and the connecting portion (leg portion) 22A is not necessarily linear, and may be curved, for example, as shown in FIG. Furthermore, the effect of absorbing vibration is also obtained by the elasticity of the material.

  Further, FIG. 8 shows a structure in which the accumulator 2 is attached using the plate-like member 22 in which the direction of the connecting portion (leg portion) 22A described above is directed substantially to the center of the compressor. Also with the plate-like member 22, as in the above-described embodiment, the excitation force component Fsinθ is substantially normal to the compressor, and the tangential vibration can be more reliably reduced. Further, with respect to Fsinθ, since the connecting portion 22A is in the same direction, the rigidity is high and vibration in the normal direction can also be suppressed.

  Also in the configuration of the second embodiment, as shown in FIG. 2, the suction pipe 2 </ b> A that is a refrigerant path from the accumulator 2 to the compressor is inclined and coupled to the inner wall of the accumulator 2. As a result, the vibration of the suction pipe 2A is reduced. In this configuration, the position of the coupling is made to coincide with the plate-like member 22A in the height direction as shown in FIG. 2 and in the width direction as shown in FIG. Then, by coupling the suction pipe 2A to a position where the connecting portion 22A and the accumulator 2 are welded and the rigidity is increased, the vibration of the suction pipe 2A is reduced, and thus the vibration and noise generated from the accumulator 2 are reduced. It has a structure.

  Further, as shown in FIG. 9, the suction pipe 2 may be curved so as to be coupled with the accumulator inner wall, while avoiding liquid refrigerant dripping along the inner wall and sucking refrigerant gas. Or although not shown here, you may comprise by two or more components.

  In the above description, a sealed vertical rotary compressor has been described as an example of the embodiment of the present invention. However, the present invention is not limited to this, and for example, a non-sealed rotary compressor, for example. The present invention can also be applied to a compressor or a scroll compressor. The present invention described above is not limited to the following embodiments, and is not intended to limit the scope of the present invention only to those embodiments unless otherwise limited. It will be clear that this is only an illustrative example.

  DESCRIPTION OF SYMBOLS 1 ... Sealed container, 1A ... Cylindrical body, 1B ... Cover body, 1C ... Bottom body, 2 ... Accumulator, 2A ... Suction pipe, 3 ... Stator, 4 ... Rotor, 5 ... Crankshaft, 5A ... Eccentric part, 6 ... Main bearing, 7 ... Cylinder, 10 ... Sub-bearing, 11 ... Roller, 13 ... Vane, 15 ... Main bearing fastening bolt, 16 ... Sub-bearing fastening bolt, 17 ... Discharge pipe, 20 ... Main bearing insertion part, 21 ... sub-bearing insertion part, 22 ... plate-like member, 22A ... connection part (leg part), 22B ... welded part.

Claims (5)

In the electric compressor provided with an electric motor and a compression mechanism that is rotationally driven by the electric motor, the outer shape is provided in a substantially cylindrical sealed container, and an accumulator is attached to the outer peripheral surface of the sealed container.
The connecting portion for attaching the accumulator to the outer peripheral surface of the sealed container is partly joined to the outer peripheral surface of the sealed container, and the pair of legs are joined to the outer peripheral surface of the accumulator,
The accumulator includes a pipe inside thereof, and a part of the pipe is coupled to the inner wall of the accumulator, and the position of the coupling includes the leg portion supporting the accumulator, the height direction and the width direction The electric compressor characterized by substantially agree | coinciding in both . In the electric compressor provided with an electric motor and a compression mechanism that is rotationally driven by the electric motor, the outer shape is provided in a substantially cylindrical sealed container, and an accumulator is attached to the outer peripheral surface of the sealed container.
The connecting portion for attaching the accumulator to the outer peripheral surface of the sealed container is partly joined to the outer peripheral surface of the sealed container, and the pair of legs are joined to the outer peripheral surface of the accumulator, And the said leg part is extended outside so that it may become the range of 26 degrees-45 degrees with respect to the straight line which connects the center of the said airtight container, and the center of the said accumulator ,
The accumulator includes a pipe inside thereof, and a part of the pipe is coupled to the inner wall of the accumulator, and the position of the coupling includes the leg portion supporting the accumulator, the height direction and the width direction The electric compressor characterized by substantially agree | coinciding in both . In the electric compressor provided with an electric motor and a compression mechanism that is rotationally driven by the electric motor, the outer shape is provided in a substantially cylindrical sealed container, and an accumulator is attached to the outer peripheral surface of the sealed container.
The connecting portion for attaching the accumulator to the outer peripheral surface of the sealed container is partly joined to the outer peripheral surface of the sealed container, and the pair of legs are joined to the outer peripheral surface of the accumulator, And the said leg part is extended outside so that it may face the center of the said airtight container ,
The accumulator includes a pipe inside thereof, and a part of the pipe is coupled to the inner wall of the accumulator, and the position of the coupling includes the leg portion supporting the accumulator, the height direction and the width direction The electric compressor characterized by substantially agree | coinciding in both . In the electric compressor as claimed in any one of claims 1 to 3, wherein the leg portion includes an electric compressor, characterized in that it is formed by bending a single plate-shaped member. Wherein the electric compressor as claimed in any one of claims 1 to 3, the electric compressor being characterized in that welded joint and an outer peripheral surface of the said leg accumulator in two or more points.

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