JP2003120531A - Hermetically closed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetically closed compressor which reduces the noise or vibration level. SOLUTION: This hermetically closed compressor comprising a compression mechanism unit to compress a refrigerant, a motor to drive the compression mechanism unit, and an enclosed vessel with these units disposed on the inner side thereof, has a member in which a part having a cylindrical shape of the closed vessel forms a plurality of layers closely fitted to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor in which an electric motor and a compression mechanism are arranged in a hermetic container.

[0002]

2. Description of the Related Art In a hermetic compressor as described above, a compression mechanism portion arranged inside a hermetically sealed container, an electric motor for driving the compression mechanism portion, or a refrigerant is sucked into the compression mechanism portion and compressed. Sounds and vibrations at the time of being discharged are transmitted to the outside through a hermetically sealed container and transmitted as noises, which causes a discomfort to the user.

As an example of the prior art for reducing such vibration and noise, there is Japanese Utility Model Laid-Open No. 63-57384.

In this prior art, a rotary type hermetic compressor is provided, which has an electric motor having a stator and a rotor in a first hermetic container, and a cylinder and a rolling piston arranged in the cylinder. And place
A second closed container provided on the outer periphery of the first closed container,
The whole of the first closed container is covered. In addition, a space is provided between the first and second closed containers,
Lubricating oil for cooling and lubricating the compression mechanism section and the electric motor, or a refrigerant compressed in the cylinder flows into this space.

In the conventional compressor having such a structure, various noises and vibrations generated by the electric motor and the compression mechanism are transmitted to the first closed container, and then the space around the outer periphery of the first closed container. To the second closed container. These noises and vibrations vibrate the closed container 1 and are transmitted to the outside as noises and vibrations. Generally, when noise and vibration in the closed container 1 pass through the closed container and go out, noise and vibration energy are attenuated by the energy loss when the closed container is vibrated and go out.

[0006]

However, in the hermetically sealed container of the hermetic compressor as in the above-mentioned prior art, energy loss is reduced for noise and vibration having a frequency close to the natural frequency, and noise is reduced. And the energy of vibration is not greatly attenuated and emerges outside. Therefore, such a conventional technique has a problem that noise and vibration during operation cannot be sufficiently reduced.

Further, in the hermetic compressor according to the above-mentioned prior art, when various noises and vibration energy generated from the electric motor which is the electric element and the compression mechanism portion which is the compression element are large, when passing through the hermetic container. Even if the energy is lost, the energy of noise and vibration is transmitted to the outside while maintaining the high energy, and there is a problem that quiet operation cannot be performed.

Further, since a space is provided between the double containers and the space is filled with fluid, the structure becomes complicated, and the pipe to the cylinder must be penetrated to fix the double container. In addition, there is a problem that the assembly takes time and labor and the cost increases.

Further, in the above-mentioned prior art, a structure for supplying and discharging the refrigerant and the lubricating oil to the structure inside the inner container, for example, the compression mechanism portion including the cylinder and the like is required, and noise and vibration from these are required. On the other hand, the same problem occurs in the conventional single closed container.

It is an object of the present invention to provide a hermetic compressor with reduced noise or vibration.

[0011]

In a hermetic compressor provided with a compression mechanism section for compressing a refrigerant, an electric motor for driving the compression mechanism section, and a hermetic container in which these are arranged, This is achieved by a hermetic compressor having a plurality of layers of members in which cylindrical portions of the hermetic container are in close contact with each other. Further, it is achieved by a hermetic compressor in which the members forming the plurality of layers are constituted by the laminated plate materials.

Further, the cylindrical portion formed around the axis of the rotary shaft of the electric motor and the inside of the hermetically-sealed container arranged on either side of the cylindrical portion sandwiching the members forming the plurality of layers. This is achieved by including a pipe that communicates with the outside.

Further, there is provided a compression mechanism portion for compressing the refrigerant, an electric motor for driving the compression mechanism portion, and a hermetically sealed container having a lubricating oil for cooling the rear portion of the compressor and the electric motor for cooling the electric motor. In the hermetic compressor, the hermetic compressor is provided with a plate member which covers the outside of the hermetic container and is in close contact with the outside. This is achieved by a hermetic compressor, in which the plate material is arranged so as to cover the outside of the cylindrical shape of the hermetic container.

Furthermore, the inside of the hermetically sealed container is arranged on either side of the cylindrical portion formed around the axis of the rotating shaft of the electric motor and the plate material provided on the cylindrical portion and overlapped with each other. This is achieved by providing a pipe that communicates the outer side with the outside.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

A first embodiment of the hermetic compressor according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view showing a first embodiment of a hermetic compressor according to the present invention. FIG. 2 is an enlarged cross-sectional view of a part of the container of the hermetic compressor shown in FIG. FIG. 3 is a cross-sectional view showing a BB cross section shown in FIG.

In FIG. 1, a compression mechanism portion and an electric motor are arranged inside a container 1 of the compressor, and a pipe for connecting the compression mechanism portion and the internal space of the container to the outside of the container is provided penetrating the container. Has been. In this embodiment, the container 1 is composed of three parts, and has a cylindrical portion 1a that covers the compression mechanism portion and the electric motor portion 2, and lid members 1b and 1c joined to the cylindrical portion. ing. The electric motor 2 includes a stator 2a and a rotor 2b, the inner rotor 2b is joined to the crankshaft 6, and the rotation of the rotor 2b of the electric motor 2 rotates and drives the compression mechanism portion coupled to the crankshaft 6. It

The compression mechanism portion has a cylinder 3 having two compression chambers 3a and 3b, and a piston having two rolling pistons 4a and 4b arranged in each compression chamber of the cylinder 3 and attached to a crankshaft 6. It is equipped with 4. Further, in the figure, bearing parts 5a and 5b are provided on both sides of these cylinders 3 and are attached to and support the crankshaft 6, respectively. The first bearing 5a is on the electric motor 2 side (cylinder 3
And the electric motor 2), the second bearing 5b is attached to the crankshaft 6 so as to support the front end side of the crankshaft.

The cylindrical portion 1a of the container 1 is provided with a first container 7 inside a cylindrical compressor formed of a plate material and a second container 8 provided on the outer side of the first container 7 so as to overlap each other. Here, the first bearing 5 a and the stator 2 a are fitted and connected inside the first container 7.

In the cylindrical container 1a, the inner first
The container 7 and the second container 8 on the outer side are combined with each other so as to have a shape superimposed on each other, and the lid members 1b and 1c are fitted inside the first container 7 and joined to each other. . That is, the first container 7 and the lid members 1b and 1c are joined and hermetically sealed, and the first container 7 and the lid member form a hermetically sealed container of the compressor. In addition, the cylindrical outer side of the cylindrical first container 7 and the cylindrical inner side portion of the second container 8 are in a combined state in which they are superposed and in close contact with each other, and the ends thereof are aligned. First lid member 1b, 1c
The outside of the fitting portion (joint portion) with the container 7 is covered with the second container 8. As a method for joining these containers, shrink fitting, press fitting, drawing by stacking two plates, etc. can be considered.

Further, as shown in FIG. 1, the lid member 1b is provided with a second bearing 5b and a pipe penetrating the space inside the container 1 and the outside of the container 1 therethrough.

FIG. 2 shows an enlarged view of the container 1 in the A section of FIG. 1, and FIG. 3 is a sectional view showing a BB section of FIG. As shown in these figures, the first container 7 and the second container 8 are superposed on each other, joined together, and in close contact with each other. As a result, in this embodiment, the container 1 forms a layer of a plurality of plate materials from the inside to the outside of the compressor.

With such a structure, vibrations and sounds generated from the cylinder 3 inside the compressor, the electric motor 2 and the like are transmitted to the first and second containers, and the first and second containers 7 and 8 vibrate with each other. To do. At this time, friction occurs due to mutual vibrations on the surfaces of these containers that are intimately connected to each other. That is, the first and second containers 7 and 8 are different in mass and shape. Therefore, depending on the frequency of the vibration or sound, the amplitude or phase of the vibration transmitted to these containers is deviated. Therefore, the vibration of the first and second containers 7 and 8 causes friction between them.

Due to this friction, the energy of vibration or sound is converted into another energy such as heat, so that the vibration or sound is attenuated and its magnitude is reduced. In order to more effectively reduce the vibration and sound due to this friction, it is desirable that the joining surface between the first and second containers does not have another member such as a soft adhesive or resin.

Further, the deformations of the first and second containers 7 and 8 caused by the transmission of internal vibrations and sounds have characteristic deformation modes at their natural frequencies. The magnitude of the deformation based on the above and the phase also shift. Since both the first and second containers are closely attached to each other on the surface, deformation caused by vibration of one acts to prevent deformation of the other. This also suppresses the deformation caused by the vibration of the both, and reduces the vibration and sound propagating from the inside of the compressor to the outside.

That is, according to the configuration of the above embodiment, even if the first container 7 is vibrated by the various noises and vibrations generated from the compression element and the electric element 2, the first container 7 is vibrated.
Friction generated on the contact surface between the second container 8 and the second container 8 attenuates noise and vibration energy. Further, the first container 7 and the second container 8 are coupled by shrink fitting, press-fitting, drawing, or the like so that the first container 7 and the second container 8 have a binding force. As a result, the first container 7 and the second container 8 suppress mutual vibrations, so that various noises and vibrations generated by the compression element and the electric element are attenuated, and the energy of the noises and vibrations propagated to the outside of the compressor. Can be attenuated, and the magnitude of the amplitude at the natural frequency of the closed container can be reduced. Further, inside the first container 7, the first bearing 5
a and the stator 2a are fitted and joined to the container 7, and an outer second container 8 is provided so as to cover this joining position. Sound can be effectively reduced by coupling the first and second containers 7 and 8.

In this embodiment, the second container 8 is arranged so as to cover the joint between the lid members 1b and 1c and the first container, and the stator 2a joined to the inside of the first container 7 and Vibration and sound transmitted from the first bearing 5a are suppressed from being transmitted to the lid member.

Further, in FIG. 1, the outer second container 8 is formed by being superposed on the shape of the inner first container.
The shape of the second container 8 outside the first container, which is a closed container constituted by the first container and the lid member, may not be the same as the shape of the first container, and can be freely determined according to use. That is, it is possible to make the shape so as to cover the location of the first container 7 more effectively according to the internal vibration, the volume of sound, and the generation position.

For example, as shown in FIG. 8, an outer plate may be arranged so as to overlap a part of the closed container so as to cover it. FIG. 8 is a sectional view showing a modified example of the hermetic compressor shown in FIG. In this figure, 1 / of the inner container 7 which is a closed container
An outer plate is shown which overlaps two or more turns and is overlapped, and this outer plate corresponds to the outer second container 8 with respect to the inner first container 7. The outer plate and the container 7 are intimately coupled to each other, and the vibration and sound of the electric motor 2 and the compression mechanism portion transmitted to the first container are transmitted to the container 7 and the outer plate 81 to generate vibration. The energy is dissipated and attenuated by the friction on the surfaces that are joined and contact.

Further, since the overlapping portions are provided over more than 1/2 circumference of the cylindrical portion of the container 7 forming the closed container, the outer plate 81 and the inner container 7 are firmly connected. Therefore, the close contact state can be maintained for a long time. This makes it possible to reduce vibration and sound over a longer period.

Further, in the present embodiment, the pipe is attached to the lid member in consideration of the ease of attaching the pipe arranged to penetrate therethrough. This is because, in order to attach and seal the pipes through the container 1a forming a plurality of layers, the work process and time are increased, the manufacturing cost is increased, and the reliability is maintained for a long time. It is difficult to do so. From this point, the pipe may be provided in the first container 7 made of one plate material that is not covered by the outer second container.

Further, although the compressor of the present embodiment is described in the form of horizontal installation in which the crankshaft of the electric motor is arranged in a substantially horizontal direction, for example, the lid member 1c is downward and the lid member 1b is upward. The same effect can be achieved in a so-called vertical arrangement as well. The same applies when the lid member 1b is placed upside down with the lid member 1b inverted. However, in this case, the compression mechanism section including the cylinder 3 is the electric motor 2.
Since it is arranged below, the space for arranging the pipe for sucking in and discharging the refrigerant with respect to the cylinder 3 is smaller than that in the case where the compression mechanism is above and the case of the horizontal tail machine. In particular, it is expected that it will be difficult to provide a pipe through the portion of the lid member 1b located below the cylinder 3.

In this case, it is desirable in terms of mounting that the pipes penetrate the cylinder 3 from the side. Therefore, the outer container 8 is arranged outside the inner container 7 to a position where the first bearing member 5a is covered, while the inner container 7 is provided so as to be exposed to the outside of the compressor in a portion where it is arranged through the pipe. May be. By doing so, it is possible to easily attach the pipes, fix the pipes by welding, and reduce vibration and noise. Further, the cylindrical portion of the lid member 1b may be formed longer than that shown in FIG. 1, and an outer plate may be provided so as to cover and close the cylindrical portion.

Alternatively, a pipe may be provided in the cylindrical portion of the lid member 1b. In this case, the lid member 1b is the first bearing 5a.
The end portion on the opposite side of the electric motor 2 is shaped so as to cover the periphery of the cylinder 3.

FIG. 4 shows a modification of this embodiment. 9 is
The inner grooved first container, 10 is the outer grooved second container. As shown in FIG. 4, the grooved first container 9 and the grooved second container 10 are joined together by fitting the grooves provided on the plate members of the respective containers. With this structure, even if the grooved first container 9 is vibrated and vibrated by various noises and vibrations generated from the compression element and the electric element, the contact surface between the grooved first container 9 and the grooved second container 10 By the friction generated at 1, noise and vibration energy can be attenuated. Further, the grooved first container 9 and the grooved second container 10 are coupled by fitting the grooves provided on the plate materials of the respective containers, whereby the grooved first container 9 and the grooved second container 1
Since the coupling force is given to 0, the grooved first container 9 and the grooved second container 10 suppress mutual vibrations, so that various noises and vibration energy generated from the compression element and the electric element are attenuated. The energy of noise and vibration transmitted to the outside of the compressor can be attenuated. Further, the vibration level of the natural frequency as the shell of the closed container can be attenuated.

If the compressor has a closed container,
The hermetic compressor is not limited to the rotary type but may be, for example, a scroll type hermetic compressor.

The procedure for assembling the hermetic compressor according to the present invention will be described with reference to FIG. FIG. 5 is a diagram illustrating a procedure of assembling the hermetic compressor according to the present invention.

In (a), the outer second container 8 is shrink-fitted to the inner first container. The first container 7 is inserted into the inside of the second container 8 which has been expanded due to the increased temperature, through a predetermined gap. When the temperature of the container 8 decreases, the container 8 contracts, and the first container 7 and the second container 8 receive the contracting force of the second container as a bonding force and are closely bonded to each other. (B) shows a process of shrink-fitting the first container 7, the compression mechanism portion, and the electric motor 2 including the rotor 2b. Inside the inner container 7,
The electric motor 2 including the compression mechanism portion and the rotor 2b is inserted. Similarly, in (c), the inner container and the stator 2a of the electric motor 2 are shrink-fitted. Here, the first and second containers 7 and 8 are on the side that is heated and expanded, and have the same action as (a) above in that they are joined by contraction when the temperature drops.

In (d), the lid member 1c is fitted and joined to the inner container 7. In this example, the first container 7 is
The lid member 1b on the right side of FIG. 1 is formed of the same member so as to also serve as the lid member 1b, and the lid member 1c on the left side and the first container 7 are the containers 7.
It is joined and sealed inside. That is, in the present embodiment, the plate-shaped first container 7 is fitted and fitted so as to cover the outside of the cylindrical portion of the plate-shaped cylindrical second container 8 and to be in close contact with each other. Also in this embodiment, a pipe may be arranged so as to penetrate the first container 7 or the lid member 1c on the right side with the second container 8 interposed therebetween. Alternatively, the second container 8
The pipe may be arranged so as to penetrate the cylindrical portion of the first container whose outer side is not covered.

Another example of the process of assembling the container according to the hermetic compressor of the present invention will be described with reference to FIG. In this figure, an example of performing drawing using two plate materials will be described. In (a), a plate having a substantially circular hole formed on one side and a flat plate having no hole on the other side are overlapped with each other, and in (b), a convex portion having a cylindrical shape is extruded around the hole. . At the end of this cylindrical portion, the member expands and contracts and is drawn. The drawing process is adjusted so that the hole is located at the tip of the protrusion.
In (c), the root of the convex portion having this cylindrical shape is cut to form a double container. That is, in this embodiment, the flat plate having the holes is the outer second container, and the plate having no holes is the inner first container. (D) shows a cross-sectional view of a container in which a double layer is formed by the plate obtained by this processing. In particular, in this embodiment, the plate member corresponding to the second container covers the right side of the container in the drawing and the portion corresponding to the lid member in the above-described embodiments. That is, the second container 8 is configured to cover not only the cylindrical portion of the first container 7 but also the spherical curved surface of the end of the container 7. With this spherical curved surface, the friction between the two plate materials becomes large at the time of forming, so resin or oil may be added, but even after the container shape is formed, the joining force between the two is maintained by the coupling force of the cylindrical portion. be able to.

Next, a modification of the drawing of the container shown in FIG. 6 will be described with reference to FIG. FIG. 7 is a diagram showing a modification of the container forming process shown in FIG.

In FIG. 6 (a), the two plates are superposed on each other in the same manner as in FIG. 6, but no holes are formed in any of the plates in this example. (B) is formed by extruding a convex portion as in FIG. 6 so that a cylindrical portion is formed. However, in this example, a portion having a large extrusion diameter is provided on the base side (plate material side) of the convex portion, and the convex portion has two steps. In (c), a double container is formed by cutting at the position of the convex portion on the root side. In (d), the lid member is joined to the double container so as to cover the upper side of the double container formed in (d), and the double container is hermetically sealed to form a hermetic container for a compressor. In particular, this example is suitable for a container of a reciprocating compressor.According to the above-described embodiment, various noises and vibrations generated by the compression element and the electric element cause the first container to vibrate and vibrate. Also, noise and vibration energy can be attenuated by the friction generated at the contact surface between the first container and the second container.

Further, the first container and the second container are joined by closely contacting each other, and since the first container and the second container have a binding force, the first container and the second container are mutually connected. Since the vibration is suppressed, the energy of various noises and vibrations generated by the compression element and the electric element is attenuated, and the noises and vibrations transmitted to the outside of the compressor can be reduced.

Further, since the vibration of the natural frequency of the closed container can be reduced, the noise can be further reduced.

[0045]

As described above, according to the present invention, it is possible to provide a hermetic compressor with reduced noise or vibration.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a hermetic compressor according to the present invention.

FIG. 2 is an enlarged sectional view of a part of the container of the hermetic compressor shown in FIG.

FIG. 3 is a cross-sectional view showing a BB cross section shown in FIG.

FIG. 4 is a sectional view showing a modification of the embodiment of the hermetic compressor shown in FIG.

FIG. 5 is a diagram illustrating a procedure of assembling the hermetic compressor according to the present invention.

FIG. 6 is a diagram showing another example of the process of assembling the container according to the hermetic compressor of the present invention.

7 is a diagram showing a modified example of the forming process of the container shown in FIG.

8 is a cross-sectional view showing a modified example of the hermetic compressor shown in FIG.

[Explanation of symbols]

1 ... airtight container, 1a ... (cylindrical) container, 1b ... lid member, 1c ... lid member 2 ... electric motor, 2a ... stator, 2b ... rotor 3 ... -Cylinder 3a ... First cylinder 3b ... Second cylinder 4 ... Rolling piston 4a ... First rolling piston, 4b ... Second rolling piston 5 ... Stationary member, 5a ... first bearing 5b ... second bearing 6 ... crank shaft 7 ... first container 8 ... second container 9 ... grooved first container 10 ... grooved first Two containers

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tatsuya Wakana             2 709 Tomita, Ohira Town, Shimotsuga District, Tochigi Prefecture             Hitachi Tochigi Electronics Co., Ltd. F term (reference) 3H003 AA05 AB05 BA07 BB08 BE07                       CD01 CE02                 3H029 AA04 AA15 BB21 BB32 CC09                       CC24 CC25 CC30

Claims (10)

[Claims] 1. A hermetic compressor provided with a compression mechanism section for compressing a refrigerant, an electric motor for driving the compression mechanism section, and a hermetically sealed container in which the electric motor is arranged. A hermetic compressor having a plurality of layers of which parts having a cylindrical shape are in close contact with each other. 2. The hermetic compressor according to claim 1, wherein the members that form the plurality of layers are formed of stacked plate materials. 3. The cylindrical portion formed around the axis of rotation of the electric motor, and the inside of a closed container which is arranged on either side of the cylindrical portion sandwiching the members forming the plurality of layers. The hermetic compressor according to claim 1, further comprising a pipe that communicates with the outside. 4. A hermetically sealed container having a compression mechanism section for compressing a refrigerant, an electric motor for driving the compression mechanism section, and a lubricating oil for cooling the rear section of the compressor and the electric motor. A hermetic compressor, comprising a plate member which covers the outside of the hermetic container and is in close contact with it. 5. The hermetic compressor according to claim 3, further comprising the plate member arranged so as to cover the outer side of the cylindrical shape of the hermetic container. 6. The inside of a hermetically sealed container, which is arranged on either side of the cylindrical portion formed around the axis of rotation of the electric motor and the plate material provided on the cylindrical portion and overlapped with each other. 4. A pipe for communicating between the outside and the outside.
Or the hermetic compressor according to item 4. 7. The hermetic compressor according to claim 3, wherein the plate member and the hermetic container are arranged in a plurality of layers from the inside to the outside of the hermetic container. 8. The plate members are overlapped with each other so as to cover more than 1/2 circumference of the cylindrical portion of the closed container.
The hermetic compressor according to any one of 1. 9. The hermetic compressor according to claim 2, wherein the plate members are fitted and closely attached. 10. The hermetic compressor according to claim 2, wherein the plate members are stacked by press fitting.