JP3129103B2 - Hermetic electric compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

It relates to sealed electric compressor used in refrigeration equipment of the air conditioner and refrigerator BACKGROUND OF THE especially those which reduce the noise due to rotation vibration caused by the rotation of the compressor.

[0002]

2. Description of the Related Art As an example of a conventional hermetic electric compressor, an example of a vertical hermetic electric compressor is shown in FIG. 12, and an example of a horizontal hermetic electric compressor is shown in FIGS.

A conventional vertical hermetic electric compressor shown in FIG. 12 has a structure in which a lower portion of a cylindrical hermetic container 1 is fixed, and a support member 10 is disposed near a lower end of the hermetic container 1 to prevent vibration. Supported by an elastic support (not shown) made of rubber or a spring. The number of support points is generally three.

[0004] The hermetic electric compressor shown in FIG.
Are located above the center R of the support point of the hermetic electric compressor. Further, a connection pipe 2 for connecting the hermetic electric compressor and the refrigeration cycle is arranged at an upper end portion or a cylindrical surface of the hermetic container 1.

[0005] Next, in the horizontal hermetic electric compressor shown in Fig. 13, a support member 10 is arranged below a cylindrical surface of a cylindrical hermetic container 1. There are generally four support points, which are supported via an elastic support (not shown) made of rubber or a spring for vibration isolation. Further, the connection pipe 2 connected to the refrigeration cycle is generally provided on both end surfaces of the closed vessel 1, but may be provided on a cylindrical surface as shown by a dotted line in FIG.

[0006] The horizontal hermetic electric compressor shown in Fig. 14 has a cylindrical hermetic container 1 in which support members 10 are disposed at the height of the center axis on both side end surfaces. The center axis is substantially equal to the axis of the rotating shaft (not shown) of the built-in electric motor. The support member 10 supports the closed container 1 at three points, but may support it at four points. Further, connection pipes 2 connected to the refrigeration cycle are arranged at upper portions on both side end surfaces of the sealed container 1.

The relationship between the center of gravity G, the supporting points, and the piping of the hermetic electric compressor in FIGS. 13 and 14 will be described with reference to FIGS. The center of gravity G of the horizontal hermetic electric compressor is generally substantially on the center axis of the cylinder of the hermetic container, that is, on the axis of the rotating shaft (not shown) of the electric motor. 15 shows an example where the center R of the support point of the hermetic electric compressor is below the center of gravity G, and FIG. 16 shows a case where the center R of the support point of the hermetic electric compressor substantially coincides with the center of gravity G. It is shown.

As shown in FIG. 16, when the center R of the supporting point of the hermetic electric compressor substantially coincides with the center of gravity G, that is, the axis of the rotating shaft (not shown) of the motor, vibration at the supporting point is reduced. Since it can be made substantially in the vertical direction, the support structure can be easily simplified, and the amplitude of vibration can be easily reduced. An example of this type is Japanese Utility Model Publication No. 2-16070.

[0009]

In the hermetic electric compressor shown in FIG. 12, the center of gravity G is higher than the center R of the supporting point of the hermetic electric compressor, so that the hermetic electric compressor vibrates. In such a case, a moment whose arm length is equal to the distance between the center R of the support point and the center of gravity G acts on the hermetic electric compressor, and the amplitude width of the vibration tends to increase toward the upper part of the hermetic electric compressor. . Further, since the connection pipe 2 and the connection pipe 2a for connecting the hermetic electric compressor and the refrigeration cycle are arranged on the upper end portion or the cylindrical surface of the hermetic container 1, it is far from the center R of the support point substantially corresponding to the fulcrum of vibration. The larger the connecting pipe, the larger the amplitude of the vibration, and the vibration of the hermetic electric compressor was easily transmitted to the connected refrigeration cycle.

As shown in FIG. 15, when the center R of the support point of the hermetic electric compressor is below the center of gravity G, that is, the axis of the rotating shaft (not shown) of the electric motor, the hermetic electric compressor is turned off. When it rotates and vibrates in the direction of rotation about the center of gravity G, a moment whose arm length is the distance between the center R of the support point and the center of gravity G acts on the support point. Here, since the supporting point is fixed, the amplitude in the rotation direction can be reduced to some extent by the elasticity of the elastic supporting member 11.

However, since the upper part of the hermetic electric compressor provided with the connection pipe 2 is not supported, a reaction of the moment acting on the above-mentioned support point acts to make the center point R of the support point substantially center. The hermetic electric compressor vibrates right and left as shown by a dashed line in FIG. Since the amplitude of the vibration is substantially centered on the center point R of the support point, the amplitude increases as the upper part of the hermetic electric compressor is increased. Therefore, when the connection pipe 2 is disposed above the closed vessel 1 as shown in FIG. 15, the connection pipe 2 has large amplitude vibration, and the vibration transmitted to the refrigerant pipe of the refrigeration cycle is large. The vibration of the whole apparatus and the vibration noise due to the vibration were likely to increase.

As shown in FIG. 16, when the center R of the supporting point of the hermetic electric compressor substantially coincides with the center of gravity G, that is, the axis of the rotating shaft (not shown) of the electric motor, as shown in FIG. Due to the reaction, the upper portion of the hermetic electric compressor provided with the connection pipe 2 is unlikely to have a large amplitude. Therefore, it is easier to reduce the amplitude of the upper part of the hermetic electric compressor provided with the connection pipe 2 than in the example of FIG. However, the one shown in FIG. 16 is easy to reduce the amplitude of the vibration.
Is far away from the center R of the support point, it cannot be said that the amplitude in the rotational direction at the position of the connection pipe 2 about the center R of the support point can be made sufficiently small.

As described above, the above-described conventional hermetic electric compressor is a factor that causes an increase in the vibration of the refrigeration apparatus and an increase in the noise due to the propagation of the vibration from the connection pipe.
Furthermore, the vibration of the piping of the refrigerating apparatus and the entire refrigerating apparatus due to the propagation of the vibration from the connection pipe may repeatedly generate stress at the pipe joint and the like, leading to deterioration of the joint.

The vibration of the hermetic electric compressor will be described with reference to FIG. 10 which is a sectional view of the electric motor section. The rotor 3 and the compression mechanism (not shown) have an unbalanced weight of the rotating system. When the unbalanced weight rotates, a centrifugal force acting in the outer peripheral direction of the closed container 1 is partially generated, Due to this partial centrifugal force, the hermetic electric compressor revolves around the rotation axis M that was located at the time of stop.

The unbalanced weight of the compression mechanism is, for example, a roller (also called a rotary piston) that rotates eccentrically in the case of a rotary compressor. The unbalanced weight of the rotor is a balance weight provided on the rotor to balance with the eccentrically rotating roller.

As shown by the arrow in FIG. 10, the stator 4 and the sealed container 1 are rotated by the rotating shaft M as a reaction between the rotating motion of the rotor 3 and the rotating motion of the compression structure of the hermetic electric compressor.
Around a small angle corresponding to the magnitude of the reaction. The revolving motion and the revolving motion are repeated, and the hermetic electric compressor vibrates.

FIG. 11 is a schematic diagram for explaining the vibration of the conventional hermetic electric compressor, which is generated by the relationship between the rotation axis of the hermetic electric compressor and the rotation center when the hermetic electric compressor vibrates. FIG. 4 is a schematic diagram illustrating a vibrating vibration. That is, FIG.
As shown in FIG. 5, four support points 10 are provided below the position of the axis of the rotating shaft M of the hermetic electric compressor (motor unit). Two pairs of the support points 10 are provided near both end faces of the hermetic electric compressor, and the center R of the pair of support points 10 and the center point R of the other pair of support points 10 are connected. The line S is supported so as to be parallel to the rotation axis M. The reaction of the stator 4 repelling to the magnetic force of the rotor 3 with the rotation of the rotor 3 and the reaction due to the fluctuation of the compression torque of the refrigerant gas compression at the start of the compression mechanism and during one rotation are caused by the hermetic electric compressor. The whole body is caused to repeat the rotation at a slight angle about the line S as a fulcrum. Moreover,
The axis of the rotation shaft M is located at a position higher than the height position of the center R of the support point 10. This is because the supporting form is unstable, and the line S connecting the centers R of the supporting points 10 of the hermetic electric compressor is used as a fulcrum of vibration, and the fulcrum line S The greater the distance from to the rotation axis M corresponding to the center of gravity, the greater the amplitude of the vibration. In particular, since one connection pipe 2 is far away from the center R (the above-mentioned line S) of the support point 10, this connection pipe 2 has a large amplitude.

The large amplitude of the connection pipe 2 is propagated to the refrigeration system, causing the refrigerant pipe of the refrigeration apparatus to vibrate to generate a specific frequency sound having a characteristic value of the refrigerant pipe, and that the refrigerant pipe comes into contact with another member. Therefore, there is a problem that abnormal noise is generated, and further, repeated stress due to vibration is applied, thereby causing deterioration of a pipe connection portion.

The present invention relates to an electric motor in a hermetic electric compressor .
Rotational vibration caused by the rotation of the machine is reduced at the connection pipe section connecting the refrigerant pipes, so that the vibration of the refrigerant pipes and the propagation from the refrigerant pipes to the entire apparatus are reduced, and the noise due to the vibrations and vibrations is reduced. The purpose is to make it smaller.

[0020]

Above object to an aspect of the, in the motor unit and the motor unit and the sealed electric compressor accommodating a compression mechanism portion connected with the rotating shaft in a sealed container, fitted tightly closed container a connecting pipe refrigerant pipes of the refrigeration cycle is connected with its, axis substantially the same position Moshiku of axial center away of the rotating shaft is provided connecting pipe to the axial center of the rotating shaft and the connecting pipe a position between, and a support member which center points of the support point for supporting the sealed electric compressor is located, double the support member
The supporting points of the plurality of supporting members are the axis of the rotating shaft.
This is achieved by providing a hermetic electric compressor provided at a position sandwiching .

[0021]

[Function] When the hermetic electric compressor vibrates, the support point of the hermetic electric compressor is brought closer to the connection pipe,
The amplitude of the connecting pipe due to the rotational vibration of the hermetic electric compressor is reduced, and the vibration energy transmitted to the refrigerant pipe connected to this connecting pipe is suppressed, so that the pipe vibration and the stress applied to the pipe can be reduced. is there.

[0022]

1 shows an embodiment of a horizontal hermetic electric compressor. The horizontal hermetic electric compressor shown in FIG. 1 includes a suction pipe 2a at one of end faces on both sides of a cylindrical hermetic container 1,
On the other hand, a connection pipe 2 for the discharge pipe 2b is provided. Moreover, the center R of the support point supported by the support member 10 is made to substantially coincide with the axis of each connection pipe 2. This support member 10 is made by molding a metal plate.
Elastic supports 11 such as vibration-proof rubber or vibration-producing strips at four locations
Are provided in two places for assembling, and are attached to the refrigerating apparatus via the elastic support 11.

Here, the axis of the connecting pipe 2 and the supporting member 10
The middle part of the supporting member 10 is connected to the connecting pipe 2 so that the centers of the two vibration-isolating rubber mounting holes described above coincide with each other and the supporting member 10 does not contact the connecting pipe 2 to cause interference. It is shaped to escape.

Further, the suction pipe 2a is disposed on one end face of the closed casing 1 at a position lower than the center of gravity G of the hermetic electric compressor, that is, lower than the axis of the rotating shaft of the electric motor section. And the center of the support point of the support member 10 is made substantially coincident. Similarly, the discharge pipe 2b and the support member 10 are
The other end face of the closed casing 1 is disposed at a position higher than the center of gravity of the hermetic electric compressor, that is, the axis of the rotating shaft of the electric motor section, and the center of the axis of the suction pipe 2 a and the supporting point of the support member 10. Approximately match.

With the above structure, when the hermetic electric compressor vibrates, the moment whose arm length is equal to the distance between the center R of the supporting point and the center of gravity G acts on the hermetic electric compressor. Connect the support point of the electric compressor to the connection pipe 2 (2a.2b).
Since this distance is close to 0 as a point substantially the same as the axis of the shaft, during rotation vibration of the hermetic electric compressor, the hermetic electric compressor swings substantially with the center R of the support point as a fulcrum. Thus, the amplitude of the position of the connection pipe 2 (2a, 2b) due to the rotational vibration was small, the vibration energy transmitted to the connection pipe 2 was suppressed, and the pipe vibration and the stress applied to the pipe could be reduced.

As shown in FIG. 2, the amplitude of the connection pipe due to the vibration caused by the rotation of the hermetic electric compressor which occurs as a reaction of the rotation of the electric motor portion is also determined by the center of gravity G of the hermetic electric compressor. On the other hand, support points are provided above and below, and the hermetic electric compressor is supported so as to vibrate around a straight line S connecting the center R of one of the two support points. Since S is not parallel and has an angle, the straight line S forming the angle is included in the force to be rotated.
Since the directional component acts, apparently the force for rotating the hermetic electric compressor is reduced, and the vibration of the connection pipe 2 can be suppressed. Moreover, in FIG. 2, the right side of the hermetic electric compressor has the connection pipe 2 and the center of the support point positioned at the upper part, and the left side has the connection pipe 2 and the center of the support point positioned at the lower part. The fulcrum that oscillates in amplitude has a positional relationship to face each other across the rotation axis M. For this reason, the right side of the hermetic electric compressor swings about the center of the support point located at the upper part as a fulcrum, and the upper part hardly swings and tries to increase the amplitude toward the lower part. However, the left side of the hermetic electric compressor swings around the center of the support point located at the lower part, and the lower part hardly swings and tries to increase the amplitude toward the upper part. become. Thus, not only the amplitude of the connection pipe portion can be reduced, but also the vibration of the entire hermetic electric compressor can be reduced.

Here, the energy of the non-rotation of the hermetic electric compressor due to the structure of the support member is equivalent to the energy of the elastic support 1.
1 absorbs vibration. In recent years, low-vibration hermetic electric compressors such as a rotary hermetic electric compressor having a plurality of cylinders and a scroll hermetic electric compressor have a small rotational vibration. Absorption has made that much less problematic. Even in the case of such a low-vibration hermetic electric compressor, the above-described embodiment is very effective in the case where noise due to the connection pipe becomes a problem.

Therefore, the vibration transmitted to the connection pipe can be reduced, thereby reducing the pipe noise and the stress applied to the pipe.

FIGS. 3 and 4 show the vibration caused by the relationship between the support point R and the position of the connection pipe 2 in the embodiment shown in FIG.

FIG. 3 shows the center R of the supporting point of the hermetic electric compressor.
Is below the center of gravity G (position substantially the same as the axis of the rotating shaft). As shown in FIG. 3, when the center R of the support point of the hermetic electric compressor is below the center of gravity G, the moment whose arm length is the distance between the center R of the support point and the center of gravity G is at the support point. Works. Here, since the support point is fixed, the elasticity of the elastic support member 11 absorbs the amplitude in the rotation direction to some extent and reduces it.

On the other hand, since the upper portion of the hermetic electric compressor provided with the connection pipe 2 is not supported, a reaction of the moment acting on the above-mentioned support point acts to substantially move the center point R of the support point. The hermetic electric compressor vibrates right and left around the center as shown by the dashed line in FIG. The amplitude of this vibration is
Since the center point R of the support point is substantially at the center, the larger the upper part of the hermetic electric compressor.

Therefore, in the embodiment shown in FIG. 3, since the center R of the supporting point and the position of the connection pipe 2 substantially coincide with each other, the connection connection pipe 2 connecting the hermetic electric compressor and the refrigeration cycle is rotated in the rotation direction. The refrigerant pipe of the refrigeration cycle connected to the connection pipe 2 does not vibrate greatly, and the vibration of the whole connected apparatus and the noise due to the vibration can be reduced.

FIG. 4 shows an embodiment in which the center R of the supporting point of the hermetic electric compressor is above the center of gravity G. As shown in FIG. 4, when the center R of the support point of the hermetic electric compressor is above the center of gravity G, the moment whose arm length is equal to the distance between the center R of the support point and the center of gravity G becomes the support point. 3, the hermetic electric compressor oscillates like a pendulum about the center R of the supporting point, and the center R of the supporting point.
A position distant from the main point has a large amplitude in the rotation direction, and a position near the center R of the support point has almost no amplitude in the rotation direction.

Therefore, in the embodiment shown in FIG. 4, since the center R of the support point and the position of the connection pipe 2 substantially coincide with each other, the connection pipe 2 connecting the closed type electric compressor and the refrigeration cycle is rotated in the rotation direction. With little amplitude, the refrigerant pipe of the refrigeration cycle connected to the connection pipe 2 does not vibrate significantly, and the vibration of the whole connected apparatus and the noise due to the vibration can be reduced.

FIG. 5 is a left side view schematically showing an embodiment in which the positions of the connection pipes in the schematic view of FIG. 3 are changed, and FIG. 7 is a left side view specifically showing the schematic view of FIG. It is. Closed container 1
The supporting member 10 is fixed to one end face of the refrigeration apparatus by welding or the like, and is an example in which the supporting member 10 is installed in a refrigerating apparatus via an elastic support 11. The center point of the support point is defined as the middle point of the mounting portions of the two elastic supports 11 provided on the support member 10. Here, due to the configuration of the hermetic electric compressor, when the center of the connection pipe 2 is not located at the center in the left-right direction in the side view of the hermetic electric compressor, the center of the connection pipe 2 with respect to the center of gravity G. This is an example in which the center of the connection pipe 2 and the center R of the support point are brought close to each other by setting the height of the connection point and the center R of the support point in a substantially horizontal direction.

FIG. 6 is a right side view schematically showing an embodiment in which the position of the support member in the schematic diagram of FIG. 4 is changed, and FIG.
FIG. 7 is a right side view specifically illustrating the schematic diagram of FIG. 6. That is, the support member 10 is fixed to one end surface of the closed container 1 by welding or the like, and is an example in which the support member 10 is installed in a refrigerating apparatus via the elastic support 11. The connection pipe 2 is set on the upper end of one end face of the closed vessel 1, and the support member 10 is fixed to the closed vessel 1 via welding or a rotatable pin or the like, and is fixed to the refrigeration apparatus via the elastic support 11. Have been.
In the embodiment shown in FIGS. 6 and 8, the center of the connection pipe 2 is set above the center of gravity G, the center R of the support point is set between the connection pipe 2 and the center of gravity G, and the connection pipe is connected. This is an example in which the center of the support 2 and the center R of the support point are close to each other. The embodiment shown in FIGS. 6 and 8 does not make the center of the connection pipe 2 coincide with the center R of the support point as shown in FIG.
The center R of the support point is provided between the elastic support 11 and the center of gravity G between the center of gravity and the center of gravity G. If the height of the elastic support 11 is too large, it is difficult to secure the strength against the pendulum-shaped vibration as shown by the one-dot chain line in FIG. As a result of consideration in consideration of mass productivity, it has been found that it is sufficient that the distance is between the center of gravity G (corresponding to the position of the axis of the rotating shaft) and the connection pipe. The position to be determined between the center of gravity G (corresponding to the position of the axis of the rotating shaft) and the connection pipe is determined by the output of the motor unit, the compression torque set by the compression mechanism unit, and the motor unit and the compression mechanism unit. It is necessary to determine the optimum position according to the mass of the rotating part, the mass of the non-rotating part, the characteristics of the elastic support member, mass productivity, and other factors.

As described above, in the examples shown in FIGS.
Even when the center of the connection pipe 2 does not always coincide with the center point R of the support, the vicinity of the connection pipe 2 is supported, and the center point R of the support and the center of the pipe with respect to the distance between the center R of the support point and the center of gravity G. By shortening the distance to the point, a superior result can be obtained with respect to the conventional support structure in terms of vibration suppression.

Next, FIG. 9 shows an example of a vertical hermetic electric compressor. The vertical hermetic electric compressor shown in FIG.
Discharge pipe 2b on the upper end surface and suction pipe 2 on the cylindrical surface
a supporting member 10 near the connection pipe 2a.
And a support member 10 provided near the connection pipe 2b and a support member 10 provided below the connection pipe 2b. However, the attenuation in the horizontal direction of the elastic support member 11 attached to the support member 10 provided below the connection pipe 2b is small, and the amplitude is set with the line S connecting the other two elastic support members 11 as a fulcrum. Like that. The connection pipe 2a. The support member 10 provided at a position distant from 2b may not be provided, and it may be better to provide two instead of one. This is determined according to the above factors.

[0039]

According to the present invention, can reduce the stress on the piping vibration and piping, low vibration, low noise of the refrigerating device can be configured, reliability for the stress can be reduced to a connecting pipe improved it can.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hermetic electric compressor according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an axis of a rotation shaft and a line connecting center points of two support points according to the embodiment.

FIG. 3 is a left side view illustrating a support state on the left side of the schematic diagram of FIG. 2;

FIG. 4 is a right side view illustrating a support state on the right side of the schematic diagram of FIG. 2;

FIG. 5 is a left side view showing an embodiment in which the positions of the connection pipes in the schematic diagram of FIG. 3 are changed.

FIG. 6 is a right side view showing an embodiment in which the position of the support member in the schematic diagram of FIG. 4 is changed.

FIG. 7 is a left side view specifically illustrating the schematic view of FIG. 5;

FIG. 8 is a right side view specifically illustrating the schematic view of FIG. 6;

FIG. 9 is a perspective view showing an embodiment of a vertical hermetic electric compressor.

FIG. 10 is a schematic cross-sectional view of a motor unit showing a reaction that a closed container receives with respect to rotation of a rotor.

FIG. 11 is a perspective view illustrating the vibration of a conventional hermetic electric compressor.

FIG. 12 is a perspective view illustrating vibration of a conventional vertical hermetic electric compressor.

FIG. 13 is a perspective view illustrating vibration of a conventional horizontal hermetic electric compressor.

FIG. 14 is a perspective view illustrating vibration of another conventional horizontal hermetic electric compressor.

FIG. 15 is a schematic view illustrating a vibration mode of a conventional horizontal hermetic electric compressor.

FIG. 16 is a schematic view for explaining a vibration mode of a conventional other horizontal hermetic electric compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed container 2 ... Compressed fluid piping 2a ... Suction pipe 2b ... Discharge pipe 3 ... Rotor 4 ... Stator 10 ... Support member 11 ... Elastic support body G ... Center of gravity (axis of a rotating shaft) M ... Motor Rotation axis S: A straight line connecting the center points R of the two support points
R: Center point of support point

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Sekiguchi 800, Tomita, Ohira-cho, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture Inside the Living Equipment Division, Hitachi, Ltd. (72) Inventor Tatsuya Wakana 709-2, Tomita, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture, Japan Inside Hitachi Tochigi Electronics Corporation (56) References JP-A-2-153277 (JP, A) ( 58) Field surveyed (Int. Cl. ⁷ , DB name) F04B 39/00 102

Claims (2)

(57) [Claims] We claim: 1. In a motor unit in a sealed container and the electric motor portion and the hermetic electric compressor accommodating a concatenated compression mechanism in the rotary shaft, the refrigerant pipe before Symbol mounted in the refrigerating cycle in a sealed container a connecting pipe but to be connected, axial center set apart of the rotary shaft
The vignetting the axis of the connection pipe of the axis substantially the same position or before <br/> Symbol rotation axis position between the front Symbol connecting pipe, supporting the dense <br/> closed form electric compressor And a supporting member at which a center point of the supporting point is located .
The support point of the support member is located at the position
Sealed electric compressor, characterized in that provided. 2. A hermetic electric compressor in which an electric motor section and a compression mechanism section connected to the electric motor section by a rotating shaft are housed in an airtight container, wherein a refrigerant pipe of a refrigeration cycle attached to the airtight container is provided. The connecting pipe to be connected and the rotating shaft
The height between the vignetting the axial center of the connecting axis and substantially the same height as the pipe or pre <br/> Symbol rotation axis and the front Symbol connecting pipe, the dense <br/> closed form electric compressor and a support member in which the center point of the support point is located to support the mounting position prior Symbol connecting pipe are respectively provided in the axial direction of both ends of the front Symbol rotating shaft, is connected pipe provided respectively to the opposite ends , sealed electric compressor which is characterized in that provided above and below the height position of the axis so as to sandwich the axis of the pre-Symbol rotation axis.