JP2000179474A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type compressor obtaining a lap gap corresponding to a revolution number, reducing a motive power loss and accomplishing energy saving. SOLUTION: In the scroll type compressor, a compression part 2 and an electric motor 3 are disposed in a seal container 1 and a stationary scroll 4 having a scroll lap 4b on a mirror plate 4a and a rotative scroll 5 having a lap 5b having the same shape on a mirror plate 5a and engaged with the stationary scroll 4 to form a plurality of compression chamber 9 are provided on the compression part and a gas compression load is applied to a rotative driving shaft 7. A parallel flat portion 7a is provided on an outer periphery of the rotative driving shaft 7 at an angle θ formed with a gas compression load direction and a bush 6 having a shaft bore 6a for slidably retaining the flat portion 7a is provided. A spring member 20 for urging the rotative driving shaft 7 to the other end direction of a non-flat portion and functioning to an opposite direction to a vector component of the gas compression load direction is disposed between one end of the non-flat portion of the shaft bore 6a of the bush 6 and the rotative driving shaft 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a structure of a turning shaft.

[0002]

2. Description of the Related Art FIG. 5 is a longitudinal sectional view showing the structure of a conventional scroll compressor, and FIG. 6 is an explanatory view of a load model acting on a turning drive shaft of the conventional scroll compressor.

[0003] In a scroll type compressor, a compression section 2 and an electric motor 3 are built in a sealed container 1. The compression section 2 is mainly composed of a fixed scroll 4, an orbiting scroll 5, a rotation preventing device, an orbiting drive shaft 7, a crankshaft 8, a main bearing 9, a metal bearing 10, and a shaft 11.

[0004] The compression section 2 is composed of a fixed scroll 4 having a spiral wrap 4b on a head plate 4a and a head plate 5a.
And a plurality of compression chambers 12, 12a, 12
An orbiting scroll 5 for forming b or the like is provided. Further, a shaft 11 for supporting the orbiting drive shaft 5c of the orbiting scroll 5 and forming a crankshaft 8 at the lower end for orbiting driving, a bearing 7 for supporting the crankshaft 8 and a center of the bottom surface of the fixed scroll 4 And a discharge port 15 which communicates with the central compression chamber 12 formed at the center.

In this configuration, when the shaft 11 is rotated by the rotation of the electric motor 3, the orbiting scroll 5 makes a revolving motion with respect to the fixed scroll 4 without rotating by the anti-rotation device, and the fixed scroll 4 and the orbiting scroll 5 mesh with each other. A pair of compression chambers 12 formed by
a and 12b sequentially move from the outer peripheral part to the central part, and the intake pipe 1
3, the volume of the refrigerant gas taken into the intake chamber 14 is reduced, and a compression action occurs. The compressed gas of the refrigerant enters the motor room 17 from the discharge port 15 provided at the center of the fixed scroll 4 through the communication path 16, and is guided to the outside through the discharge pipe 18.

[0006] By the way, the scroll type compressor generally has a small centrifugal force in a low rotation range and increases the gap between the wall surfaces of the wraps 4a and 5a.
The gaps between the wall surfaces a and 5a are reduced in the direction of the centrifugal force.

However, since the sealing effect of the oil is insufficient in the low rotation range, the wraps 4a,
It is desirable that the gap between the wall surfaces of the wraps 4a and 5a is maintained at a predetermined value in a high rotation range where the sealing effect by the oil works effectively by reducing the gap between the wall surfaces of the 5a, thereby reducing power loss due to sliding and aiming at energy saving. A scroll compressor was expected.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a scroll type compressor capable of obtaining a lap gap corresponding to the number of rotations, reducing power loss and conserving energy. The purpose is to do.

[0009]

According to the present invention, a compressor and an electric motor are arranged in a sealed container, and the compressor is engaged with a fixed scroll having a spiral wrap and the fixed scroll. A swivel scroll having a spiral wrap to form a plurality of pairs of compression chambers; and a shaft that supports a swivel drive shaft of the swivel scroll and forms a crankshaft at one end and revolves. And a main bearing that supports the crankshaft. In a scroll compressor in which a gas compression load is applied to the orbiting drive shaft, an outer peripheral portion of the orbital drive shaft has a direction in which the gas compression load is applied. A parallel flat portion having an angle θ is provided, and a bush having a shaft hole for slidably holding the flat portion is provided, and between one end of the non-flat portion of the shaft hole of the bush and the turning drive shaft, The turning drive shaft is connected to the other Biased in a direction, so formed by disposing a spring member which acts in the opposite direction to the same direction vector component of the gas compression load.

Further, the angle θ between the flat portion and the direction of the gas compression load acting on the turning drive shaft is set to an angle which increases the gap of the wrap wall surface when the gas compression load is applied. .

The angle θ is set to an angle at which the pressing force against the wrap wall becomes zero when the rotation speed during operation is a predetermined value. Alternatively, the strength of the spring is set such that the pressing force against the wrap wall surface becomes zero when the rotation speed during operation is a predetermined value.

The spring material is a leaf spring having a V-shaped cross section. Further, notches are formed at both ends of the spring material, and locking portions for locking the notches are provided so as to protrude from both ends of the non-flat portion toward the spring material. Further, a convex piece for locking the upper end of the spring material and restricting the movement of the bush in the axial direction is provided on an upper portion of one side wall of the non-flat portion of the shaft hole of the bush.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail based on embodiments with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a configuration of a scroll compressor of the present invention, and FIG.
FIG. 3 is an enlarged cross-sectional view of a main part of FIG. 1 and FIG. 3 is an enlarged explanatory view of a main part of a scroll compressor according to an embodiment of the present invention.

Other than the basic configuration of the present embodiment, it is the same as the conventional example shown in FIG. 5, so that the description of the overall configuration will be omitted. The same numbers are used for the same components.

A compression unit 2 and an electric motor 3 are arranged in a sealed container 1, and the compression unit is formed into a fixed scroll 4 having a spiral wrap 4b, and a fixed scroll 4 meshed with the fixed scroll 4 to form a spiral. Compression chambers 1 having a plurality of wraps 5b
Swivel scroll 5 forming 2, 12a, 12b, etc.
A shaft 11 that supports the turning drive shaft 7 of the turning scroll 5 and that forms a crankshaft 8 at one end and turns.
The main bearing 9 which supports the crankshaft 8 constitutes a scroll compressor.

A discharge port 15 is provided at the center of the fixed scroll 4 and the compression chambers 12 and 1 are provided near the discharge port 15.
Discharge chambers 2a and 12b and a normal discharge pressure are provided.

A gas compressing load acts on the turning drive shaft 7. Here, flat portions 7a, 7b having an angle θ formed with the direction of the gas compression load are provided on the outer peripheral portion of the turning drive shaft 7, and a shaft hole 6a for slidably holding the flat portions 7a, 7b. Is provided.

At the same time, between the one end of the non-flat portion 6a3 of the shaft hole 6a of the bush 6 and the turning drive shaft 7, the turning drive shaft 7 is urged toward the other end of the non-flat portion 6a3,
A spring member 20 acting in the opposite direction to the same-direction vector component of the gas compression load is provided.

The flat portion 7a and the turning drive shaft 7
Of the wraps 4b, 5b when the gas compression load is applied is made an angle θ with the direction of the gas compression load acting on the wrap 4b, 5b. And the angle θ
When the rotation speed during operation is a predetermined value, the lap 4b,
The angle is set so that the pressing force against the 5b wall surface becomes zero. Alternatively, the strength of the spring member 20 may be such that the pressing force against the wall surfaces of the wraps 4b and 5b becomes zero when the rotation speed during operation is a predetermined value.

On the other hand, as the spring member 20, a leaf spring having a V-shaped cross section is used. In addition, notches 20a are formed at both ends of the spring member 20, and locking portions 7c1 corresponding to the notches 20a protrude from both ends of the non-flat portion 7c toward the spring member 20. Further, a convex piece 6b for locking the upper end of the spring member 20 and restricting the movement of the bush 6 in the axial direction is provided on an upper portion of one side wall of the non-flat portion 7c of the shaft hole 6a of the bush 6.

Next, the operation and effect of the present invention will be described. The relationship between the high pressure (Pd) and the low pressure (Ps) in a scroll compressor when an air conditioner is installed is generally as shown in FIG. As shown in the figure, the ratio of high pressure to low pressure is small at low rotation, and therefore the effect of gas compression load is small, but as the rotation speed increases, the ratio of high pressure to low pressure increases, and the gas compression load increases. The effect of is increased.

FIG. 6 shows a model of the load acting on the turning drive shaft 7. When the turning drive shaft 7 turns in the direction of the arrow, centrifugal force, seal reaction force,
Gas compression load acts. In the present invention, description will be made focusing on the gas compression load. FIG. 4 is an explanatory diagram of a gas compression load and a pressing force model of a spring material of the scroll compressor according to the embodiment of the present invention.

Here, the gas compression load is set at an arbitrary angle θ.
Received by the flat portions 7a and 7b, and a reaction force parallel to the flat portions,
Vector decomposition into normal force. The pressing force of the spring member 20 according to the present invention is a force opposing the reaction force. Also,
The vector composite force of the reaction force and the pressing force of the spring member 20 is the pressing force against the wall surfaces of the wraps 4b and 5b.

For this reason, in the low rotation range, the reaction force is smaller than the pressing force of the spring member 20, and the wraps 4b, 5b
b Acts in the direction of reducing the wall gap. On the other hand, in the high rotation range, the reaction force is larger than the pressing force of the spring member 20, and the gap between the wall surfaces of the wraps 4b and 5b is enlarged and acts in a direction of separating. As a result, the sealing effect of the oil in the low rotation range is improved to eliminate the leakage, and in the high rotation range, the contact between the wall surfaces of the wraps 4b and 5b is suppressed, and the power loss is reduced.

The angle θ between the flat portions 7a and 7b and the direction of the gas compression load acting on the turning drive shaft 7 is defined as:
When the gas compression load is applied, the wraps 4b, 5b
When the rotation speed during operation is a predetermined value, the pressing force against the wall surfaces of the wraps 4b and 5b is zero.
Since the pressing angle is set to the following angle, the direction can be always reversed while the pressing force changes from the above-described low rotation range to the high rotation range.

On the other hand, the spring member 20 uses a leaf spring having a V-shaped cross section, and has notches 20a formed at both ends of the spring member, and a locking portion 7 corresponding to the notch 20a.
c1 protrudes from both ends of the non-flat portion 7c toward the spring material 20, so that the spring material 20 is removed from the non-flat portion 7c.
Can be locked at both ends. Further, since the upper end of the spring member 20 is locked on the upper portion of one side wall of the non-flat portion 6a3 of the shaft hole 6a of the bush 6, a convex piece 6b for restricting the movement of the bush 6 in the axial direction is provided. , The bush 6
Can be restricted in the axial direction. Thus, even when the scroll compressor is of the horizontal type, the same operation and effect as those of the vertical type can be obtained.

[0027]

According to the present invention, a compression section and an electric motor are arranged in a sealed container, and the compression section is swirled by engaging a fixed scroll having a spiral wrap and the fixed scroll with each other. A revolving scroll having a wound wrap and forming a plurality of pairs of compression chambers; a shaft for supporting a revolving drive shaft of the revolving scroll and forming a crankshaft at one end for revolving motion; A main bearing that supports a crankshaft, and in a scroll compressor in which a gas compression load is applied to the orbiting drive shaft, an outer peripheral portion of the orbiting drive shaft includes:
A flat portion parallel to the direction of the gas compression load is formed at an angle θ, and a bush having a shaft hole for slidably holding the flat portion is provided, and one end of the non-flat portion of the shaft hole of the bush and the bush. Between the turning drive shafts, a spring material that urges the turning drive shaft toward the other end of the non-flat portion and acts in the opposite direction to the same direction vector component of the gas compression load is provided. did. As a result, it is possible to obtain a scroll type compressor that can obtain a lap gap corresponding to the number of rotations, reduce power loss, and save energy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part in FIG.

FIG. 3 is an enlarged explanatory view of a main part of the scroll compressor according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram of a gas compression load and a pressing force model of a spring material of the scroll compressor according to the embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a configuration of a conventional scroll compressor.

FIG. 6 is an explanatory diagram of a load model acting on a turning drive shaft of a scroll compressor according to the present invention and a conventional example.

FIG. 7 is an explanatory diagram of pressure (high pressure and low pressure) with respect to the rotation speed of a scroll compressor according to the present invention and a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing container 2 Compressor 3 Electric motor 4 Fixed scroll 4a End plate 4b Lapping 5 Orbiting scroll 5a End plate 5b Lapping 6 Bush 6a Shaft hole 6a1 Flat portion 6a2 Flat portion 6a3 Non-flat portion 6a4 Non-flat portion 6b Convex piece 7 Flat driving shaft Part 7b Flat part 7c Non-flat part 7c1 Locking part 7d Non-flat part 8 Crankshaft 9 Main bearing 10 Metal bearing 11 Shaft 12 Compression chambers 12a, 12b A pair of compression chambers 13 Intake pipe 14 Intake chamber 15 Discharge port 16 Communication path 17 Motor room 18 Discharge tube 19 Discharge chamber 20 Spring material 20a Notch

Claims (7)

[Claims] 1. A compressor and an electric motor are arranged in a sealed container,
A fixed scroll having a spiral wrap; a rotating scroll having a spiral wrap to form a plurality of pairs of compression chambers; It comprises a shaft that supports a swing drive shaft of the swing scroll, forms a crankshaft at one end and swings, and a main bearing that supports the crankshaft, and a gas compression load acts on the swing drive shaft. In the scroll type compressor, a flat portion parallel to an angle θ formed with the direction of the gas compression load is provided on an outer peripheral portion of the orbiting drive shaft, and a shaft hole for slidably holding the flat portion is provided. A bush is provided, and between the one end of the non-flat portion of the shaft hole of the bush and the turning drive shaft, the turning drive shaft is urged toward the other end of the non-flat portion,
A scroll compressor comprising a spring member acting in a direction opposite to the same direction vector component of the gas compression load. 2. An angle θ between the flat portion and a direction of a gas compression load acting on the turning drive shaft is set to an angle which increases the gap of the wrap wall surface when the gas compression load acts. The scroll type compressor according to claim 1, wherein 3. The scroll compressor according to claim 2, wherein the angle θ is set to an angle at which the pressing force against the wrap wall becomes zero when the rotation speed during operation is a predetermined value. . 4. The scroll type according to claim 2, wherein the strength of the spring material is such that the pressing force against the wrap wall surface becomes zero when the rotation speed during operation is a predetermined value. Compressor. 5. The scroll compressor according to claim 1, wherein the spring member is a leaf spring having a V-shaped cross section. 6. A notch formed at both ends of the spring material, and locking portions for locking the notches are provided so as to protrude from both ends of the non-flat portion toward the spring material. The scroll type compressor according to claim 5, wherein: 7. A bush which locks the upper end of the spring material and restricts the movement of the bush in the axial direction, on the upper portion of one side wall of the non-flat portion of the shaft hole of the bush. The scroll type compressor according to claim 6, wherein