JPS61272493A - Rotary type compressor - Google Patents

Abstract

PURPOSE:To prevent generation of an electromagnetic noise by forming the peripheral face of one of the startor inner peripheral face and the rotor outer peripheral face into the shape of out of roundness with the direction of the longest axis and the direction of the shortest axis arranged in a condition perpendicular to each other. CONSTITUTION:The inner peripheral face of a startor 2a of a motor 2 housed inside an enclosed case 1 of a rotary compressor is formed into the shape of out of roundness with the direction of the longest axis L1 and the direction of the shortest axis L2 are arranged so as to be perpendicular to each other. Due to this formation, if the longest axis of the stator 2a is arranged in the direction corresponding to the direction of a position of an opening angle thetaof a discharge valve with respect to a fitting position B of a blade 1 of a cylinder 5 for the compressor, change of load of a compressive element 3 comes to be absorbed by a rotor gap, and operation of the motor in a condition where uniform rotor gaps exist is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotary compressor with an improved structure of a motor element.

(Technical Background of the Invention) Fig. 5 shows a schematic configuration of the entire rotary compressor, in which 1 is an airtight container for the compressor. The electric motor element 2 is provided with a stator 2a and a rotor 2b.Roughly speaking, the upper end of a rotating shaft 4 is attached to the rotor 2b. Also, the compression element 3 includes a cylinder 5.This cylinder 5
A main bearing 6 is placed at the top of the cylinder 5, and a sub-bearing 7 is placed at the bottom of the cylinder 5. And these cylinders 5. A compression chamber 8 is formed by the main bearing 6 and the auxiliary bearing 7, as shown in FIGS. 5 and 6. Roughly speaking, a roller 9 is disposed within this compression chamber 8. This roller 9 is fitted onto a crank portion 4a of a rotating shaft 4 that is rotatably supported by a main bearing 6 and a sub-bearing 7. The crank portion 4a is provided eccentrically with respect to the rotating shaft 4, and as the rotating shaft 4 rotates, the roller 9 rotates eccentrically within the compression chamber 8. Further, a blade 10 is attached to the wall of the cylinder 5 in the compression chamber 8.
It is installed so that it can be pushed inside. This blade 10 is constantly biased in the direction of protruding into the compression chamber 8, and its tip is held in contact with the outer peripheral surface of the roller 9. It is divided into rooms. Furthermore, a low-pressure gas suction port is formed on the low-pressure chamber side of the compression chamber 8, and a compressed gas discharge port is formed on the high-pressure chamber side of the compression chamber 8, and a discharge valve (not shown) is provided at this discharge port. It is being

When the compressor is in operation, the rotating shaft 4 is rotationally driven by the electric motor element 2, and as the rotating shaft 4 rotates, the roller 9 rotates eccentrically within the compression chamber 8, and the low pressure gas introduced into the compression chamber 8 is rotated. As the roller 9 eccentrically rotates, the compression chamber 8
After being compressed inside, the compressed gas (high-pressure gas) in the compression chamber 8 is discharged into the sealed container 1 via a discharge valve, and is further discharged to the outside via a discharge pipe (not shown) attached to this sealed container 1. It is designed to be discharged to the side.

[Problems with background technology]

In the conventional structure, as shown in FIG. 7, the inner peripheral surface shape of the stator 2a and the outer peripheral surface shape of the rotor 2b of the electric motor element 2 are formed into a substantially perfect circular shape, and these stays, the outer peripheral surface shape of the rotor 2a, and the rotor 2b are arranged concentrically, so that the distance between the stator 2a and the rotor 2b, that is, the motor gap Ma, is equalized by one around the entire circumference. However, during operation of the compressor, the load fluctuation of the motor element 2 reaches its maximum at the moment when the discharge valve of the compression element 3 opens, so that an impact force acts on the rotor 2b of the motor element 2 in the radial direction. In this case, the main body of the compression element 3 is integrated with the rotor 2b of the motor element 2 via the rotation shaft 4, so that if an impact force is applied to the rotor 2b of the motor element 2 in the radial direction, the compressor element 3 is sealed. As the container 1 deforms, as shown in FIG. Tilt diagonally (angle of inclination α). Therefore, as shown in FIG. 9, when the compressor is in operation, the center position 0- of the rotor 2b of the motor element 2 is slightly (distance e) closer to the inner peripheral surface of the stator 2a than the center position 0 when the compressor is stopped. Therefore, the motor gap Ma between the stator 2a and the rotor 2b becomes the 10th
As shown in the figure, the blade 10 of the cylinder 5 is installed at the position @B.
An appropriate rotational angle θ position of the rotating shaft 4 relative to the compression element 3
Ma - e at the angular position V) where the discharge valve opens, and at this position the motor gap Ma when the compressor is stopped
The motor gap becomes narrower by distance e. In this way, the motor gap M between the stator 2a and the rotor 2b
When a deviation occurs, a magnetic attraction force Fpull acts between the stator 2a and the rotor 2b. Note that this magnetic attraction force 1''ptllll is determined by the following equation.

Here, S: area of motor gap Ma between stator 2a and rotor 2b - πDLi /C (cd), B: 1
) Effective value of flux density (Gauss), B-CBo Xl
, 11 (where Bg is the average magnetic flux density.

1.11 indicates waveform ratio), C; Carter coefficient -1D:
Stator inner diameter (υ), Li; effective core length (3).

When the magnetic attraction force Fpull acts between the stator 2a and the rotor 2b in this way, the stator 2a vibrates in the direction of the angle θ at which the discharge valve of the compression element 3 opens due to the magnetic attraction force Fpull. There was a problem in that the closed chamber 111 was driven together with the stator 2a of the compressor □, and electromagnetic noise was generated from the compressor □.

[Purpose of the invention]

An object of the present invention is to provide a rotary compressor that can effectively suppress the generation of electromagnetic noise during operation.

[Summary of the invention]

This invention provides that the shape of the circumferential surface of at least one of the inner circumferential surface of the stator and the outer circumferential surface of the rotor forming the electric motor element is such that the longest axis direction has the longest length and the shortest axis direction has the shortest length. It is characterized by having a non-perfect circular shape arranged in an orthogonal state.

(Embodiment of the Invention) An embodiment of the invention will be described below with reference to FIG. Note that Fig. 1 shows a schematic configuration of the main parts of the rotary compressor shown in Fig. 5, and the same parts in Fig. 1 as in Fig. 5 are given the same reference numerals and their explanations will be explained. Omitted. That is, in this embodiment, as shown in FIG.
The circumferential surface shape of the inner circumferential surface of the stator 2a forming the stator 2a is an ellipse (non-perfect circle) in which the longest axis L1 direction having the longest length and the shortest axis L2 direction having the shortest length are arranged at right angles to each other. It is characterized by the fact that In this case, the blade 10 of the cylinder 5 is attached to the stator 2a with the longest axis L1 oriented in the direction corresponding to the zero opening angle position of the discharge valve with respect to the position width. The opening angle θ position V of the discharge valve relative to the installation position 11B of the blade 10 of the cylinder 5 is, for example, θ-210°±10" for an air conditioner compressor, and θ-250°±10 for a refrigerator compressor. Further, the outer peripheral surface shape of the rotor 2b of the electric motor element 2 is formed into a substantially perfect circular shape.

Therefore, in the case of the above configuration, the circumferential shape of the inner circumferential surface of the i data 2a forming the electric motor element 2 is such that the direction of the longest axis L1 having the longest length and the direction of the shortest axis L2 having the shortest length are relative to each other. The blades 10 of the cylinder 5 are attached to the longest axis L1 of the stator 2a in a direction corresponding to the opening angle 0 position of the discharge valve with respect to the position. Since the load fluctuation of the electric motor element 2 becomes maximum at the moment when the discharge valve of the compression element 3 opens during operation of the compressor, an impact force acts on the rotor 2b of the electric motor element 2 in the radial direction, and the compression element 3, the rotating shaft 4 and the rotor 2b of the electric motor element 2 are tilted diagonally around the joining area between the main body (cylinder 5) of the compression element 3 and the sealed case 1, and the rotor 2b of the electric motor element 2 is tilted obliquely with the main body of the compressor 3 during operation of the compressor. The center position 0- is the center position 0 when the compressor is stopped.
When the blade 10 of the cylinder 5 is installed slightly (distance e) closer to the inner peripheral surface of the stator 2a, the stator 2a and rotor 2b are attached in a direction corresponding to the opening angle 0 position of the discharge valve with respect to position B. The degree to which the motor gap Ma between the two motors becomes narrower can be made smaller than in the past. Therefore, it is possible to reduce the deviation of the motor gap Ma between the stator 2a and the rotor 2b, and therefore it is possible to reduce the effect of the magnetic attraction force between the stator 2a and the rotor 2b, and this magnetic attraction The generation of electromagnetic noise from the compressor can be suppressed by reducing the movement of the stator 2a and the closed container 1 due to force. Therefore, there is no need to particularly increase the rigidity of the sealed container 1, and the stator 2a
Since there is no risk of an increase in material costs, it is also possible to suppress increases in costs compared to conventional methods.

In the above embodiment, the shape of the inner circumferential surface of the stator 2a forming the electric motor element 2 is the longest axis. The case where the elliptical shape is shown in which the direction and the shortest axis L2 direction with the shortest length are arranged perpendicular to each other is shown, but the shape is a non-perfect circle as shown in the second factor, that is, the following formula is satisfied. It may be shaped.

Outer diameter dimension: rl+e-cosβ, (0≦β≦π), where the major axis is Ll-r(1+e, and the minor axis is L2-ra).

Moreover, FIG. 3 shows yet another embodiment. In this embodiment, the shape of the outer peripheral surface of the rotor 2b forming the electric motor element 2 is changed to the maximum eccentricity direction (dotted chain line in FIG. It is characterized by having an elliptical (non-perfect circular) shape with the shortest axis L2 facing the direction (indicated by X). In addition,
The inner peripheral surface of the stator 2a of the electric motor element 2 is formed into a substantially perfect circular shape.

Therefore, in the structure described above, the shape of the outer peripheral surface of the rotor 2b is changed in the direction of maximum eccentricity of the crank portion 4b that supports the roller 9 of the compression element 3 in an eccentric state with respect to the compression chamber 8 (the dashed dotted line in FIG. 3). Since the shape is an ellipse (not a perfect circle) with the shortest axis L2 facing toward the outer circumferential surface of the rotor 2b (indicated by It can be applied in the direction. Therefore, during operation of the compressor, the impact force applied to the rotor 2b of the electric motor element 2 causes the main body of the compression element 3 and the rotating shaft 4 to
and the rotor 2b of the electric motor element 2 is the main body of the compression element 3 (
When the cylinder 5) and the sealed case 1 are tilted diagonally around the joint part, the part corresponding to the shortest axis L2 of the outer peripheral surface shape of the rotor 2b can be moved closer to the inner peripheral surface of the stator 2a. The degree to which the dark motor gap Ma between the rotor 2a and the rotor 2b becomes narrower can be made smaller than in the past. Therefore, the deviation of the motor gap Ma between the stator 2a and the rotor 2b can be reduced, so that the effect of the magnetic attraction force between the stator 2a and the rotor 2b can be reduced, and this magnetic attraction The generation of electromagnetic noise from the compressor can be suppressed by reducing the movement of the stator 2a and the closed container 1 due to force. Furthermore, there is no need to particularly increase the rigidity of the closed container 1, and there is no fear that the cost of materials for the rotor 2b will increase, so an increase in cost can be suppressed compared to the conventional case. In this case, during operation of the compressor, the impact force applied to the rotor 2b of the electric motor element 2 causes the main body of the compression element 3, the rotating shaft 4, and the rotor 2b of the electric motor element 2 to be damaged by the cylinder 5). When the stator 2b is tilted diagonally around the joint part with the sealed case 1, the part corresponding to the shortest axis L2 of the outer peripheral surface shape of the stator 2b is brought closer to the inner peripheral surface of the stator 2a, so that the rotating shaft 4 Regardless of the rotational angular position of , it is possible to always reduce the deviation of the motor gap Ma between the stator 2a and the rotor 2b. Therefore, for example, even if the opening position of the discharge valve is changed due to a change in the refrigerating capacity, this can be easily handled.

Note that in the above embodiment, the 〇-ta 2 forming the electric motor element 2
Fig. 4 shows the case where the peripheral surface shape of the outer peripheral surface of b is an ellipse in which the direction of the longest axis L1 having the longest length and the direction of the shortest axis L2 having the shortest length are arranged orthogonal to each other. It is also possible to use a non-perfect circular shape as shown, that is, a shape that satisfies the following equation.

Outer diameter dimension...rl)+e-CO3β, (0≦β≦π)
Here, the long axis Ll -r@+e and the short axis L: 2-r+.

Furthermore, it goes without saying that various other modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

- According to the present invention, the shape of the circumferential surface of at least one of the inner circumferential surface of the stator and the outer circumferential surface of the rotor forming the electric motor element is set such that the length is the longest in the 24 axial direction and the length is the shortest in the axial direction. Since the non-circular shape is arranged such that the shortest axes are orthogonal to each other, it is possible to effectively suppress the generation of electromagnetic noise during operation.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main part showing one embodiment of this invention, Figs. 2 to 4 are cross-sectional views of the main part showing different embodiments, and Fig. 5 is a rotary type compression Fig. 6 is a longitudinal sectional view showing the schematic structure of the entire machine; Fig. 6 is a transverse sectional view showing the compression element;
The figures are a cross-sectional view taken along the line ■-■ in Fig. 5, Fig. 8 is a schematic configuration diagram showing the tilted state of the rotor during operation of the compressor, and Fig. 9 is a cross-sectional view of the electric motor element during operation of the compressor. FIG. 10 is a cross-sectional view of the main parts of a conventional example. 2... Electric motor element, 2a... Stator, 2b...
Rotor, 3... Rotary compression element, Ll...
Longest axis, L2... Shortest axis. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 3 Figure 4 Figure 5 Figure 1G 10 Figure

Claims (3)

[Claims] (1) In a rotary compressor equipped with an electric motor element and a rotary compression element, the circumferential shape of at least one of the inner circumferential surface of the stator and the outer circumferential surface of the rotor forming the electric motor element is determined by the length. A rotary compressor characterized in that the rotary compressor has a non-perfect circular shape in which the longest axis direction and the shortest axis direction are orthogonal to each other. (2) The electric motor element has a non-perfect circular shape in which the inner peripheral surface of the stator is oriented in a direction corresponding to the opening angle direction of the discharge valve with respect to the blade position of the rotary compression element. Claim No. 1 characterized in that
) The rotary compressor described in section 2. (3) The motor element has a rotor whose outer peripheral surface is a non-perfect circular shape with the shortest axis facing the direction of maximum eccentricity of the crank part that supports the roller of the rotary compression element eccentrically with respect to the compression chamber. A rotary compressor according to claim (1), characterized in that: