JPH10288157A - Hermetic electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain vibration while securing safety even on a narrow support projection surface by miniaturization by arrangement of a support position concerning a comparatively small reciprocating piston to be used for a house- hold refrigerator, etc. SOLUTION: An elastic support material 15 is arranged on one end on the side where an overweighed part of a block 5 from a central line CL in the sliding direction of a piston 8 exists and an elastic support material is also arranged on another end roughly symmetrically and, furthermore, another elastic support material is arranged on an extension in the sliding direction of the piston 8 on a bracket 13 on the side of a cylinder 6 against a central line C4 of a crankshaft 4. Additionally, as an elastic support material is arranged and constituted by being biased to the side where the overweighed part of the block 5 exists from the central line CL in the sliding direction of the piston 8 on the bracket on the side of the cylinder 6 opposite to the crankshaft 4, it is possible to restrain vibration while securing safety even on a narrow support projection surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relatively small hermetic electric compressor used for home refrigerators and the like.

[0002]

2. Description of the Related Art In recent years, various improvements have been made to hermetic electric compressors from the viewpoint of miniaturization.

A conventional hermetic electric compressor is disclosed in Japanese Utility Model Publication No. Sho 58-52391 and Japanese Utility Model Publication No. Sho 62-30311.
Is disclosed in Japanese Patent Publication No.

Hereinafter, with reference to FIGS. 5 and 6,
A conventional hermetic electric compressor disclosed in Japanese Utility Model Publication No. 58-52391 will be described.

FIG. 5 is a vertical sectional view of a conventional hermetic electric compressor, and FIG. 6 is a plan view showing a supporting position of the conventional hermetic electric compressor.

First, there is an airtight container 101, and a motor case (not shown) is provided inside the airtight container 101. A compression element 102 is provided above the motor case.
Is installed, and the electric element 103 is installed below. The compression element 102 and the electric element 103 are connected via a rotating shaft 104.

The electric element 103 includes a rotor 105 press-fitted into a rotating shaft 104 and a stator 107 having a stator winding 106. Stator fixing bolts 108 are provided at the four corners of the stator 107, and a resin cap 109 is covered on the head of the stator fixing bolt 108. A boss 110 is provided at a position facing the resin cap 109, and the resin cap 109 is provided.
A support coil spring 111 is provided between the boss 110 and the boss 110.

[0008]

However, in the above-mentioned conventional structure, the boss 110 is not provided as shown in FIGS.
, And the distances (L1) and (L2) between the stator fixing bolts 108 are substantially equal to each other. Here, a piston performing a reciprocating motion is disposed on the compression element 102 disposed on the electric element 103. According to the above-described support structure, the support area of the boss 110 is larger than the projected area of the electric element 103 itself. Since the projection area is small, there is a problem that the stability is poor and the vibration increases.

To cope with this, it is conceivable to increase the distance (Lb) between the bosses 110. In this case, the distances (L1) and (L2) between the stator fixing bolts 108 are increased. As a result, there is a disadvantage that the stator 107 itself becomes large.

Further, since the arrangement of the stator fixing bolts 108 is substantially rectangular, the closed type container 101 for accommodating the same is provided.
Has a substantially circular cross-sectional shape, which is not only a limitation in terms of shape when miniaturized, but also the mounting position of the boss 110 on the inner surface of the sealed container 101 has a bottom shape approaching a flat surface, and the rigidity of the sealed container 101 decreases. And increased noise.

[0011] The present invention solves the conventional disadvantages.
The arrangement of the supporting positions does not depend on the rectangular shape, and even if it is on a narrow supporting projection surface, it is possible to suppress vibration while securing stability even if it is small, and the sealing that does not hinder the assembly work even with the miniaturization It is to provide a type electric compressor.

[0012]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a block having a cylinder for slidably storing a piston and having a biased portion in one direction about the sliding direction of the piston. An electric element fixed below the block, a bracket disposed under the electric element, and a block disposed between the bracket and the casing to support the block and the electric element; On the other hand, on the cylinder side, a plurality of elastic support members are disposed substantially symmetrically on both sides about the sliding direction of the piston. It has a configuration including an elastic support member that is singly displaced to the side having the eccentric portion and a terminal that is disposed through the casing and supplies power to the electric element. There.

The elastic support member, which is located on the side opposite to the cylinder with respect to the crankshaft and which is deviated toward the side having the deviated portion of the block with the center of the sliding direction of the piston as the center, and the deflected portion, And a resilient support member disposed substantially on an extension of the position of the center of gravity of the block and having a cylinder side with respect to the crankshaft.

[0014] The stator of the electric element is provided with a bracket that is fastened together with a stator fixing bolt to restrict excessive run-out in the casing.

Further, a bracket having a notch on the side opposite to the cylinder having the eccentric portion of the block on the side opposite to the cylinder with respect to the crankshaft, and having a terminal of the casing provided at a position opposed to the notch. And a configuration including

[0016]

DETAILED DESCRIPTION OF THE INVENTION The invention according to a first aspect of the present invention is directed to a block having a cylinder for slidably storing a piston, having a biased portion in one direction about the sliding direction of the piston, and a block below the block. An electric element fixed to the motor, a bracket disposed below the electric element, and a block disposed between the bracket and the casing to support the block and the electric element. On the side, a plurality of elastic support members are arranged substantially symmetrically on both sides with respect to the sliding direction of the piston, and on the side opposite the cylinder with respect to the crankshaft, the unbalanced portion of the block centering on the sliding direction of the piston. It has a configuration in which it consists of an elastic support member that is displaced to the side having the sole and a terminal that is disposed through the casing and supplies power to the electric element. Kagemen can provide which can be downsized hermetic electric compressor without being restricted in shape with narrowed to.

According to the second aspect of the present invention, the block is singly displaced from the crankshaft on the side opposite to the cylinder and having the biased portion of the block with the piston sliding in the center. Since the elastic support member and the elastic support member are disposed substantially on an extension of the center of gravity of the block having the unbalanced portion and are disposed on the cylinder side with respect to the crankshaft, the projection area of the support surface is small. Also, since the center of gravity can be placed on the center line of the support position, it is possible to provide a small hermetic electric compressor capable of improving stability and suppressing vibration.

According to a third aspect of the present invention, there is provided a component having a bracket which is fastened together with a stator of an electric element by a stator fixing bolt to restrict excessive run-out in the casing. It is possible to provide a hermetic electric compressor that requires a small number of points and can prevent the electric element from directly colliding even when an excessive impact is applied during transportation or the like, and can prevent damage to components and the like.

Further, the invention according to claim 4 has a notch on a side of the bracket opposite to the crankshaft on the side opposite to the side having the unbalanced portion of the block,
Since the terminal of the casing is provided at a position opposed to the notch, the compression element and the electric element can be used without any interference with other parts even during assembly, with respect to the complexity of downsizing. It is possible to provide a small hermetic electric compressor that can easily perform an assembling operation, such as not causing interference even when inserted in an assembled state, without increasing dead space.

(Embodiment 1) Hereinafter, a first embodiment of a hermetic electric compressor according to the present invention will be described with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a vertical partial sectional view of a hermetic electric compressor according to an embodiment of the present invention. FIG. 2 is a lateral partial cross-sectional view of the hermetic electric compressor according to the embodiment of the present invention, and FIG. 3 is a plan view showing a mounting position of an elastic support member of the hermetic electric compressor.

In FIGS. 1 and 2, reference numeral 1 denotes a casing. In the casing 1, a compression element 2 is provided above the casing 1 and an electric element 3 is provided below the casing. The compression element 2 and the electric element 3 are connected via a crankshaft 4.

The compression element 2 is mainly composed of a block 5 which is a cast product. The block 5 is provided with a bearing 7 for rotatably supporting a cylinder 6 and a crankshaft 4. Is provided with a piston 8 housed reciprocally, and the piston 8 is connected to a connecting rod 9.
Is rotatably connected to the flank shaft 4.

Here, the block 5 constituting the compression element 2
Has a deviated portion 5G at its center of gravity with respect to a line segment in the sliding direction of the piston 8 passing through the center of the crankshaft 4. The dashed line in the figure indicates the center line C1 in the casing 1, and the two-dot chain line indicates the center line C in the crankshaft 4.
4 is shown.

The electric element 3 comprises a rotor 10 press-fitted into a crankshaft 4 and a stator 11 having a stator winding (not shown). At four corners of the stator 11, there are stator fixing bolts 12. A bracket 13A is fixed to the bottom of the stator 11 with respect to the crankshaft 4 on the cylinder 6 side, and a bracket 13B is fixed on the side opposite to the cylinder 6 with respect to the crankshaft 4.

Bracket 13A and bracket 13B
, A stud pin 14 is fixed downward, and a similar stud pin 14 is also installed at a position of the inner bottom portion of the casing 1 facing the stud pin 14, and between the stud pins 14. Is the elastic support material 1
5 are installed.

Further, a terminal 16 is provided in the casing 1 so as to penetrate the wall surface and to energize the electric element 3.

With such a configuration, the electric element 3 and the compression element 2 are supported in the casing 1 in a vibration-proof manner.

The operation of the above configuration will be described below. 2 and 3, first, the bracket 13 on the cylinder 6 side with respect to the center line C4 of the crankshaft 4 is shown.
At A, a stud pin 14A is arranged at one end on the side where the deflected portion 5G of the block 5 is located from the center line CL corresponding to the sliding direction of the piston 8, and a stud pin 14B is arranged substantially symmetrically at the other end. The stud pin 14C is disposed on an extension of the sliding direction 8. Each of these makes a pair with a stud pin provided to face the bottom surface of the casing 1. An elastic support member 15A for damping vibration is provided between the pair of stud pins 14A, 14B, and 14C.
An elastic support material 15B and an elastic support material 15C are arranged, respectively.

Further, the cylinder 6 is opposite to the crankshaft 4.
On the side bracket 13B, a stud pin 14D is disposed so as to be deviated from the center line CL corresponding to the sliding direction of the piston 8 to the side where the deflected portion 5G of the block 5 is located, and provided to face the bottom surface of the casing 1. A pair is formed with the stud pin, and an elastic support member 15D is arranged between the pair.

Because of the above-described configuration, the arrangement of the stud pins is close to a substantially triangular shape with one vertex being an acute angle, and the elastic support member 1 is provided on the inner wall of the casing 1 on the side opposite to the cylinder 6.
Crankshaft 4 so that the 5D arrangement point is as close as possible
By displacing the center, it is possible to offset from the center of the casing 1, so that a space for arranging the components of the compression element 2 on the cylinder 6 side can be secured, and compared with a rectangular support arrangement. The bracket 13B on the side opposite to the cylinder 6 can be small. Therefore, compared to a compressor having a substantially circular cross section, one direction can be narrowed to reduce the installation space.

As described above, according to the present embodiment, only one stud pin is disposed on the bracket on the side opposite to the cylinder so as to be deviated to the side where the biased portion of the block is located in the sliding direction of the piston. , The arrangement of the stud pins is almost triangular, and the bracket on the side opposite to the cylinder can be smaller than the square arrangement. Further, since the center of the crankshaft can be offset from the center of the casing so as to be as close as possible to the casing on the side opposite to the cylinder, a space for centrally disposing the components of the compression element on the cylinder side can be secured. As a result, it is possible to reduce the installation space in a machine room or the like of the refrigerator by narrowing one direction with respect to the compressor having a substantially circular cross section.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIGS. 1, 3 and 4. FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. FIG. 4 is a plan view showing a mounting position of an elastic supporting member according to a second embodiment of the present invention.

In FIGS. 1, 3 and 4, 5g is
The position of the center of gravity of the block 5 in the block 5 having the unbalanced portion 5G, and 2g is the position of the total center of gravity of the assembly of the compression element 2 and the electric element 3.

The operation of the above configuration will be described below. The block center of gravity position 5g is represented by the center of gravity of the compression element 2 mainly composed of the block 5.

The position of the center of gravity of the stator 11 and the rotor 10 of the electric element 3 is equal to the center position of the crankshaft 4, and the total of the assembly of the compression element 2 and the electric element 3 which must be vibration-proof supported. The position of the center of gravity 2g is
Are substantially equal to each other under the influence of the center of gravity of the electric element 2 or are located on a line closer to the center of the crankshaft 4 and closer to the center of the crankshaft 4.

The sliding direction of the piston 8 passes through the position of the center of gravity of the block 5g and extends along the line connecting the position of the block 5 with the elastic supporting member 15D provided on the side where the deflected portion 5G is located. The elastic support member 15C is disposed at a position where the elastic support member 15C intersects on the center line CL corresponding to the above.

Therefore, the case where the weight element at the block center of gravity 5g deviated by the weighted portion 5G of the block 5 is larger than the influence of the weight element of the electric element 2 and the influence of the weight element of the electric element 2 can be neglected. Since the block center of gravity 5g is located on the straight line between the elastic support 15D and the elastic support 15C, stable support is possible. Further, even when the total center of gravity 2g in the assembly of the compression element 2 and the electric element 3 is shifted due to the influence of the center of gravity of the electric element 2, the piston is located in a direction close to the center of the crankshaft 4. The elastic support members 15A and 15B arranged symmetrically on both sides from the center line CL corresponding to the sliding direction of 8 function to perform vibration proof support.

As described above, according to the present embodiment, optimal support is possible regardless of the size of the deviating element of the center of gravity position due to the deviated portion of the block. Therefore, optimal vibration support can be ensured.

(Embodiment 3) Embodiment 3 of the present invention will be described with reference to FIGS. 1, 2 and 3. FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In FIGS. 1, 2 and 3, the bracket 13A and the bracket 13B are located at the bottom of the stator 11, and are fastened together with the stator 11 to the block 5 with the stator fixing bolts 12.

For this reason, bolts for fastening the bracket to the stator 11 in advance are not required, so that the number of parts can be reduced, and at the time of assembly, the air gap between the stacked stator 11 and rotor 10 can be made uniform. , And can be directly fixed to the block 5 to facilitate the assembling operation.

When the bracket 13A and the bracket 13B are fastened together with the stator 11 to the block 5, they extend from the outer periphery of the stator 11 by a predetermined value with respect to the clearance with the casing 1. For example, when an excessive impact is applied, such as during transportation, the compression element 2 and the electric element 3 are shaken, and even when the compression element 2 and the electric element 3 come into contact with the casing 1, it is possible to prevent a direct collision. Can be prevented.

As described above, according to the present embodiment, the number of parts is reduced by using a bracket configured so that the stator of the electric element and the bolt are fastened together and the excessive run-out in the casing is restricted. In addition, at the time of assembling, the air gap between the stator and the rotor can be positioned so as to be kept uniform and can be directly fixed to the block, so that the assembling operation can be facilitated.

(Embodiment 4) Embodiment 4 of the present invention will be described with reference to FIGS. 1, 2 and 3. FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 1, FIG. 2 and FIG.
Bracket 13 on the side opposite to cylinder 6 with respect to crankshaft 4
B, the terminal 16 provided in the casing 1
And a notch provided at a position opposite to the notch.

The bracket 13B on the side opposite to the cylinder 6 with respect to the crankshaft 4 has a substantially arcuate shape, and the outer arc has a predetermined value with respect to the clearance with the arc on the inner peripheral surface of the casing 1. It has an arc shape to maintain.

A stud pin 14D is arranged on the bracket 13B so as to be deviated to the side where the deflected portion 5G of the block 5 is located in the sliding direction of the piston 8, while the stud pin 14D is shifted in the sliding direction of the piston 8. On the opposite side of the block 5 from the side where the deflected portion 5G is located, a notch 17 is provided at a position facing the terminal 16 provided on the casing 1, and this terminal 16 and the notch 17 It is configured without interference.

The elastic support 15D at the position of the stud pin 14D is mounted as close to the casing 1 as possible, so that the support length between the elastic support 15A, the elastic support 15B and the elastic support 15C is ensured. In order to stabilize the center of gravity, the position of the notch 17 and the mounting position of the stud pin 14D are alternately symmetrical with respect to the reciprocating direction of the piston 8 so that the terminal 16 provided on the casing 1 does not contact the bracket 13B. Are located in

Therefore, with this configuration, when assembling the assembly of the compression element 2 and the electric element 3 into the casing 1, the terminal 16 and the bracket 13B can be easily inserted without contact. In addition, there is no problem even when the connector is inserted after being assembled, and damage such as disconnection of the connector or disconnection due to contact between the terminal 16 and the bracket 13B can be prevented.

As described above, according to the present embodiment, the bracket on the side opposite to the cylinder with respect to the crankshaft has the notch on the side opposite to the deviated elastic support member side, and the notch is opposed to the notch. The terminal and the bracket can be easily inserted without contact between the terminal and the bracket when the assembly of the compression element and the electric element is inserted and arranged in the casing, assembling the terminal and the bracket. There is no hindrance when inserting the connector after assembling, and furthermore, even if an excessive load is applied during transportation after the assembly is completed, it can be prevented from coming off or being damaged by contact.

[0052]

As described above, the first aspect of the present invention is provided with a cylinder for slidably storing a piston,
A block having an unbalanced portion in one direction about the sliding direction of the piston, an electric element fixed below the block, a bracket disposed below the electric element, and a bracket disposed between the bracket and the casing. An elastic support member disposed on the cylinder side with respect to the crankshaft and arranged substantially symmetrically on both sides with respect to the sliding direction of the piston. On the other hand, on the side opposite to the cylinder, an elastic support member is provided which is independently displaced toward the side having the unbalanced portion of the block with respect to the sliding direction of the piston, and is provided through the casing to supply power to the electric element. According to this configuration, the arrangement by each stud pin is almost triangular, and the bracket on the side opposite to the cylinder is smaller than the square arrangement. Need. Further, since the center of the crankshaft can be offset from the center of the casing so as to be as close as possible to the casing on the side opposite to the cylinder, a space for centrally disposing the components of the compression element on the cylinder side can be secured. As a result, a compressor having a substantially circular cross section can be narrowed in one direction to reduce the installation space in a machine room or the like of a refrigerator.

According to the second aspect of the present invention, the block is singly disposed on the side opposite to the cylinder with respect to the crankshaft and displaced toward the side having the biased portion of the block with respect to the sliding direction of the piston. According to this configuration, the elastic support member includes an elastic support member that is disposed substantially on an extension of the position of the center of gravity of the block having the unbalanced portion and is disposed on the cylinder side with respect to the crankshaft. Optimal support is possible irrespective of the size of the deviating element of the center of gravity position due to the unbalanced portion, and optimal vibration support can be ensured even when the weight changes due to a change in parts due to a change in cylinder volume or a change in the electric element .

Further, the invention according to claim 3 is provided with a bracket for restricting excessive run-out in the casing by being fastened together with the stator of the electric element by a bolt for fixing the stator. According to the configuration, the number of parts such as fixing bolts can be reduced in assembling, and the air gap between the stator and the rotor can be positioned so as to keep the air gap uniform and can be directly fixed to the block, thereby facilitating the assembling work. It can be.

According to a fourth aspect of the present invention, a notch is provided on a side of the cylinder opposite to the crankshaft opposite to the side having the unbalanced portion of the block, and the notch is opposed to the notch. According to this configuration, when the assembly of the compression element and the electric element is inserted and arranged in the casing to assemble the terminal, the terminal and the bracket do not come in contact with each other. The connector can be easily inserted, there is no problem when the connector is inserted after the connector is assembled, and furthermore, even if an excessive load is applied in the transportation after the completion of the assembly, it can be prevented from coming off or being damaged by the contact.

[Brief description of the drawings]

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

FIG. 2 is a horizontal partial cross-sectional view showing the hermetic electric compressor of the embodiment.

FIG. 3 is a plan view showing a mounting position of an elastic support member of the hermetic electric compressor of the embodiment.

FIG. 4 is a plan view showing a mounting position of an elastic supporting member according to a second embodiment of the present invention.

FIG. 5 is a vertical partial sectional view of a conventional hermetic electric compressor.

FIG. 6 is a plan view showing a supporting position of a conventional hermetic electric compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 3 Electric element 4 Crankshaft 5 Block 5G Unbalanced part 6 Cylinder 8 Piston 11 Stator 12 Stator fixing bolt 13 Bracket 15 Elastic support material 16 Terminal 17 Notch

Continuation of front page (72) Inventor Ikutomo Umeoka 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka Matsushita Refrigeration Co., Ltd.

Claims (4)

[Claims] 1. A block having a cylinder for slidably storing a piston and having an unbalanced portion in one direction about the sliding direction of the piston, an electric element fixed below the block, and an electric element A bracket disposed at a lower part of the bracket and a bracket disposed between the bracket and the casing to support the block and the electric element,
On the cylinder side with respect to the crankshaft, a plurality of elastic support members are arranged substantially symmetrically on both sides with respect to the sliding direction of the piston, and on the opposite side of the crankshaft with respect to the sliding direction of the piston. A hermetic electric compressor comprising: an elastic support member which is singly displaced to the side having the eccentric portion of the block and a terminal disposed through the casing to supply electric power to the electric element. 2. The elastic support member, which is located on the side opposite to the cylinder with respect to the crankshaft and singly displaced toward the side having the unbalanced portion of the block about the sliding direction of the piston, and the unbalanced portion. 2. The hermetic electric compressor according to claim 1, further comprising an elastic support member substantially on an extension of a position of the center of gravity of the block and having a cylinder side with respect to the crankshaft. 3. The hermetic electric compression system according to claim 1, wherein said bracket is tightened together with a stator of said electric element by a stator fixing bolt to restrict excessive run-out in said casing. Machine. 4. A notch is provided on a side of the bracket opposite to the crankshaft with respect to the crankshaft, on a side opposite to a side having an unbalanced portion of the block, and a casing terminal is provided at a position opposed to the notch. The hermetic electric compressor according to claim 1, wherein: