JPH03141883A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent damage of a bearing, which rotates a main crank shaft due to its eccentric rotation by supporting the bearing at a frame with a ring- shaped resilient member interposed. CONSTITUTION:A main crank shaft 5 to transmit torque to a revolving scroll is supported by a bearing 16 at a frame 4 with a ring-shaped resilient member 15 interposed. This ring-shaped member 15 consists of a stellate ring-shaped metal plate 15a or aggregate 15b of metal plates, and is installed at the periphery of the bearing 16 and on the inside circumference of the frame 4. Thus the main crank shaft 5 can move in any direction horizontally, in the case that foreign matter is bitten between laps of the revolving scroll 3 and a stationary scroll 2 and excessive force is produced so as to separate them from each other. This reduces excessive load to be applied on the bearing 16, to lead to elimination of damages.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a scroll compressor, and particularly to an air conditioner,
The present invention relates to a scroll compressor that is suitable for use in refrigerators and other refrigerators to improve performance with a simple structure.

[Prior Art] Scroll compressors have been attracting attention in order to reduce vibration and noise of the compressor. However, since this type of compressor is a constant displacement type, especially when a large amount of liquid refrigerant is sucked in, there is no place for the liquid refrigerant to escape, which can easily cause problems such as damage to the wrap. For example, there is a structure in which a swing link mechanism is applied to the crankshaft, the crankshaft is made eccentric, and when liquid is compressed, the eccentricity is reduced, and the gap between the wraps of the fixed scroll and the orbiting scroll is increased to prevent liquid compression. be.

Furthermore, as described in Japanese Patent Application Laid-Open No. 62-178790, there is also a structure in which a slidable swing bearing is provided on the eccentric part of the crankshaft and supported by a spring to have the same function as the above-mentioned swing link mechanism. .

[Problems to be Solved by the Invention] In the prior art described above, the former swing link mechanism has a complicated movable eccentric mechanism and requires a large storage space, which poses problems in terms of economy and space efficiency.

The latter technique described in JP-A-62-178790 is
Ultra-precise processing technology was required, and insufficient consideration was given to productivity and economic efficiency.

The present invention was made in order to solve the problems of the prior art described above, and does not require ultra-precision machining, has a simpler structure than the conventional one, and has a load applied to the main crankshaft and lap during abnormal loads such as liquid compression. The objective (first objective) is to provide a scroll compressor that can release air in any radial direction and improve reliability.

Another object (second object) of the present invention is to provide a scroll compressor in which the rotation prevention mechanism of the orbiting scroll is composed of two or more sub-crankshafts, in which the orbiting scroll is connected to the sub-crankshafts. It is an object of the present invention to provide a scroll compressor that can absorb fluctuations in distance between the main crankshaft and the main crankshaft due to differences in thermal expansion with other parts, etc., and can operate smoothly.

Furthermore, a third object of the present invention is to substantially enlarge the gap between the outer circumferential portion of the orbiting scroll base plate and the inner circumferential portion of the frame that faces the outer circumferential portion of the base plate, thereby reducing resistance caused by entrapment of refrigerating machine oil. Another object of the present invention is to provide a technique for reducing distortion when processing the base plate and spiral portion of an orbiting scroll.

A fourth object of the present invention is to provide a scroll compressor that can efficiently separate refrigerant gas and refrigerating machine oil discharged from a compression chamber to reduce outflow of refrigerating machine oil from the compressor.

[Means for Solving the Problems] In order to achieve the above first object, the configuration of the first invention related to the scroll compressor of the present invention includes an electric motor and a compressor connected to the electric motor in a closed container. It houses the mechanical parts, each having a spiral wrap on the base plate,
A fixed scroll and an orbiting scroll that form a compression chamber by meshing their respective wraps, a main crankshaft that transmits rotational force to the orbiting scroll, a frame that includes a bearing that rotates the main crankshaft, and the frame. In a scroll compressor comprising an anti-rotation mechanism that maintains an angular positional relationship with the orbiting scroll, a bearing for rotating the main crankshaft is supported by the frame via an annular elastic body.

Moreover, in order to achieve the above-mentioned second object, the structure of the second invention related to the scroll compressor of the present invention is as follows.

Under the same premise as above, the anti-rotation mechanism is composed of a plurality of sub-crankshafts having eccentric parts, and the bearings supporting the sub-crankshafts are eccentric bushes whose inner and outer diameter centers are different. .

Furthermore, in order to achieve the above third object, the configuration of the third invention related to the scroll compressor of the present invention is based on the same premise as above, and the base plate of the orbiting scroll that rotates eccentrically at the inner diameter part of the frame is , a concave groove is formed along the outer periphery of the base plate.

The manufacturing method for the scroll is to form a concave groove along the outer periphery of the scroll base plate, insert a locking pawl part into this concave groove, and apply a load almost vertically downward, with the base plate being the standard. After clamping to the surface, the top surface of the base plate and the spiral wrap portion are processed.

Further, in order to achieve the above fourth object, a fourth aspect of the scroll compressor of the present invention has a configuration in which a refrigerant gas conduction hole is formed in the outer peripheral part of the fixed scroll, and a cylindrical cylinder is formed in the upper part of the conduction hole. It has a protrusion shaped like this.

[Function] In the first invention, since the bearing of the main crankshaft is supported by the frame via the annular elastic body, liquid compression occurs between the wraps of the orbiting scroll and the fixed scroll and the bearings tend to separate from each other. The main crankshaft can be moved in any radial direction by the outer annular elastic body,
Overload on the lap and bearing caused by liquid compression can be significantly reduced.

In addition, in the second invention, since the eccentric bushing is provided on the outside of the sub-crankshaft, and the centers of the inner and outer diameters are different, the eccentric bushing is rotated within half a turn to minimize the external force caused by the difference in coefficient of thermal expansion, etc. The distance between the bearings is automatically adjusted to minimize the force acting between each bearing.

Furthermore, in the third invention, since a concave groove is provided on the outer periphery of the base plate of the orbiting scroll, the substantial gap between the outer diameter of the base plate and the inner diameter of the frame is expanded, and the resistance to jamming of refrigerating machine oil can be alleviated. Furthermore, by clamping the concave groove and applying a clamping load vertically downward to the base plate surface, no distortion occurs during machining of the base plate upper surface and lap portion.

Furthermore, in the fourth invention, since the cylindrical protrusion protruding from the upper surface of the fixed scroll is provided on the outer circumference of the fixed scroll as a gas passage, the refrigerating machine oil adhering to the upper surface of the fixed scroll is not drawn in. Only refrigerant gas can pass through.

[Example] An example of the present invention will be described below with reference to FIGS. 1 to 11.

First, FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, and the overall configuration will be explained with reference to FIG.

A pump section (compression mechanism section) is located in the upper part of the airtight container 1.

The electric motor is housed at the bottom.

The pump section includes a fixed scroll 2, an orbiting scroll 3, a frame 4. Main crankshaft5. The sub-crankshaft 6 is the main component. A suction pipe 8 connected to an external cycle is press-fitted into the suction lower portion of the fixed scroll 2, and further on its outer periphery.

A refrigerant gas communication hole 10 having a cylindrical protrusion 9 is bored. The fixed scroll 2 and the orbiting scroll 3 engage their respective lap portions to form a compression chamber (1).

The eccentric part 12 of the main crankshaft 5 is rotatably fitted into the boss part of the orbiting scroll 3, and the sub-crankshaft 6 is fitted into the base plate part.
An eccentric portion 13 is rotatably fitted therein. The sub-crankshaft 6 is supported by the frame 4 via an eccentric bushing 14 whose inner and outer diameter centers are different.

A bearing 16 is supported at the center of the frame 4 via an annular elastic body 15, and the main crankshaft 5 is rotatably fitted into the bearing 16.

The frame 4 and the fixed scroll 2 are fastened together with bolts 17 and fixed inside the closed container l. Further, the outer circumference of the base plate of the orbiting scroll 3 is slidably fitted into the joint between the frame 4 and the fixed scroll 2, and a concave groove 18 is formed along the outer circumference of the base plate.

A rotor 19, which constitutes the motor, is fitted onto the main crankshaft 5 by shrink fitting or the like, and a stator 20, which constitutes the electric motor, is fixed in the closed container 1 by shrink fitting or the like.

The operation of a scroll compressor will be explained.

The rotor 19 receives rotational force from the stator 20, causing the main crankshaft 5 to rotate, and as the eccentric portion 12 of the main crankshaft 5 rotates, the orbiting scroll 3 rotates eccentrically. The orbiting scroll 3 revolves around its axis without rotating due to the action of the sub-crankshaft 6. Refrigerant gas sucked through the suction pipe 8 by the eccentric rotation of the orbiting scroll 3 is gradually compressed in the compression chamber 11 from the suction lower of the fixed scroll 2, and is discharged into the closed container 1 from the discharge port 22. Refrigerating machine oil 26 supplied to each sliding part through the oil supply hole 21 of the main crankshaft 5 is mixed in this discharged gas. It separates, travels along the surface of the fixed scroll 2, and falls to the bottom through the gap with the closed container 1. A cylindrical protrusion 9 is provided in the refrigerant gas communication hole 10 provided on the outer periphery of the fixed scroll 2.
Because of this, the refrigerant gas cools the stator 20 and rotor 19 that pass through the electric motor section, and is supplied from the discharge pipe 23 to the external cycle without mixing with the refrigerating machine oil flowing on the surface.

Next, an embodiment of the first invention will be described with reference to FIGS. 2 to 4 in conjunction with FIG. 1.

2 is an enlarged cross-sectional view of the main part of the frame in FIG. 1, and FIGS. 3 and 4 are views taken in the direction of arrow A in FIG. Indicates a supported state.

FIG. 3 shows an example in which the annular elastic body is formed of a star-shaped annular metal plate 15a, and FIG.
5b, and is mounted on each circumference of the outer circumference of the bearing 16 and the inner circumference of the frame 4.

According to this embodiment, when the liquid refrigerant is sucked between the laps of the orbiting scroll 3 and the fixed scroll 2 and liquid compression occurs, or when foreign objects are caught and excessive force is generated to separate them from each other, Since the main crankshaft 5 can move in any horizontal direction, excessive loads on the lap portion and the bearing 16 can be significantly reduced, which has the effect of preventing damage to the lap and the bearing.

Next, an embodiment of the second invention will be described with reference to FIGS. 5 and 6 along with FIG.

5 is an enlarged cross-sectional view of essential parts showing the eccentric portions of the main and sub-crankshafts in FIG. 1, and FIG. 6 is a view taken in the direction of arrow B in FIG. 5.

Eccentric bushes 14 whose inner and outer diameter centers differ by Δε are fitted onto the outer periphery of a plurality of (two in the illustrated example) sub-crankshafts 6 shown in FIGS. 5 and 6.

The main crankshaft 5 and the sub-crankshaft 6 are rotatably fitted into and fixed to the frame 4, and the eccentric portion 12 of the main crankshaft 5
The eccentric portion 13 of the auxiliary crankshaft 6 is rotatably fitted into and fixed to the orbiting scroll 3.

The eccentric dimension between the center of the main crankshaft 5 and the center of the eccentric portion 12, and the eccentric dimension between the center of the sub-crankshaft 6 and the center of the eccentric portion 13 are each ε. Therefore, the orbiting scroll 3 only revolves without rotating. However, since the shaft part and eccentric part of each crankshaft are restrained by separate parts, without the eccentric bushing 14, the crankshaft 5 would move in the direction to reduce the load due to the difference in coefficient of thermal expansion and liquid compression. Even if such an attempt is made, the distance between the eccentric parts 12 and 13 does not change, and the load acts on the eccentric parts 12 and 13, resulting in stagnation of rotation.

According to this embodiment, since the eccentric bushing 14 whose outer and inner diameter centers differ by Δε is fitted onto the outer periphery of the sub-crankshaft 6, if the eccentric bush 14 rotates by θ, the main crankshaft 5 ．． The distance between the sub-crankshafts 6 is approximately Δ
It moves by ε and θ, and can maintain smooth rotation by following the movement of the main crankshaft 5 due to the difference in thermal expansion coefficient or liquid compression.For example, normally due to the difference in thermal expansion coefficient or liquid compression. Since the change in the distance between the crankshafts is about 0.2 nn or less, if Δε=0.5 nn, then θ=25°.

As described above, according to the embodiment of the second invention, since the eccentric bushing is fitted around the outer circumference of the sub-crankshaft which has the function of preventing the rotation of the orbiting scroll, it is possible to absorb fluctuations in the distance between the main crankshaft and the sub-crankshaft. , the difference in thermal expansion coefficient between the orbiting scroll and the frame does not pose a problem. It also has the effect of increasing the latitude in material selection, and offering the possibility of lower cost, improved reliability, and improved performance.

Next, an embodiment of the third invention will be described with reference to FIGS. 7 to 1 in conjunction with FIG. 1.

7 is an enlarged cross-sectional view of the main parts of the orbiting scroll shown in FIG. 1 and the fly 11, FIG. 8 is a view taken in the direction of arrow C in FIG. 7, and FIG. 9 is a machining state of the orbiting scroll shown in FIG. 7. A cross-sectional view showing
FIG. 10 is a view taken along arrow D in FIG. 9, and FIG. 11 is a sectional view showing the processing state of a conventional orbiting scroll.

In the embodiment shown in FIGS. 7 and 8, a concave groove 18 is formed along the outer periphery of the base plate 3a of the orbiting scroll 3. 3 in diagram
b shows a spiral wrap.

Generally, in the relationship between the orbiting scroll 3 and the frame 4, the orbiting scroll 3 rotates eccentrically at the inner diameter part of the frame 4 as the main crankshaft 5 rotates. If the gap between the inner diameter portion of the frame 4 and the frame 4 is too small, refrigerating machine oil will be trapped, resulting in an increase in mechanical loss. Increasing the clearance increases the outer diameter of the compressor, which reduces space efficiency. Further, even if the diameter of the base plate 3a of the orbiting scroll 3 is reduced, a becomes larger, but this base plate 3a has a function of maintaining airtightness between the base plate 3a and the fixed scroll 2, and the base plate 3a
If the diameter is made smaller, the sealing performance will be deteriorated and the performance will be lowered.

According to this embodiment, since the concave groove 18 is provided along the outer periphery of the base plate 3a of the orbiting scroll 3, it is equivalent to substantially increasing the gap α without deteriorating the sealing performance with the fixed scroll 2. This function allows the radial size of the compressor to remain the same while reducing mechanical loss due to refrigerating machine oil and improving efficiency.

By the way, in the conventional machining of an orbiting scroll, as shown in FIG.
' is applied, clamped, and then processed, but as shown by the broken line, distortion occurs in the spiral wrap 3b' of the pedestal 3a due to the clamping, resulting in a problem of reduced processing accuracy. According to the processing method shown in the figure, a concave groove 18 is formed along the outer periphery of the base plate 3a of the scroll 3, a locking pawl part 24 is pushed into the concave groove 18, and a load 25 is applied almost vertically downward. 1 after clamping the base plate 3a to the reference surface.
The upper surface of the base plate 3a and the spiral wrap 3b are processed.

According to this method, it is possible to eliminate distortion during ramping as in the conventional example shown in FIG. 11, and it is possible to perform faster and more accurate processing.

Next, the embodiment of the fourth invention is as already described with reference to FIG. That is, fixed scroll 2
A refrigerant gas conduction hole 10 is bored in the outer circumferential portion of the refrigerant gas, and a cylindrical protrusion 9 is formed above the conduction hole.

In this way, according to this embodiment, since the cylindrical protrusion is provided in the refrigerant gas passage, it is possible to prevent mixed flow of refrigerant gas and refrigerating machine oil, and it is possible to reduce the amount of refrigerating machine oil carried out to the external cycle. . Therefore, the heat exchange rate is increased by reducing the amount of sealed refrigerating machine oil and reducing the oil film on the inner wall of the cycle piping.
It also has the effect of reducing flow path resistance and increasing efficiency.

Note that in the above embodiment, the first. Second. 3rd degree: A scroll compressor to which all of the fourth inventions are applied has been explained,
The present invention is not limited to this. Second. Third.
Even if the fourth invention is applied independently, a corresponding effect can be obtained, and even if any of the inventions is applied in combination, a corresponding effect can be obtained. However, it is a matter of course that the one in which all of the inventions are applied as in the above embodiment is the most excellent.

[Effects of the Invention] As explained in detail above, the present invention has the following effects.

1) According to the first invention, ultra-precise processing is not required;
It is possible to provide a scroll compressor that has a simpler structure than the conventional one, can release the load applied to the main crankshaft and the wrap in any radial direction during abnormal loads such as liquid compression, and can improve reliability.

2) According to the second invention, in a scroll compressor in which the rotation prevention mechanism of the orbiting scroll is constituted by two or more sub-crankshafts, the orbiting scroll and other parts connected by the sub-crankshafts. It is possible to provide a scroll compressor that can absorb fluctuations in the distance from the main crankshaft due to differences in thermal expansion between the main crankshaft and the main crankshaft, and can operate smoothly.

3) According to the third invention, the gap between the outer periphery of the orbiting scroll base plate and the inner periphery of the frame that faces the outer periphery of the base plate is substantially enlarged, thereby reducing resistance due to entrapment of refrigerating machine oil. At the same time, it is possible to provide a technique for reducing distortion when processing the base plate and spiral portion of the orbiting scroll.

4) According to the fourth invention, it is possible to provide a scroll compressor that can efficiently separate refrigerant gas and refrigerating machine oil discharged from a compression chamber and reduce outflow of refrigerating machine oil from the compressor.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part of the frame in FIG. 1, and FIGS. 3 and 4 are FIG. The A arrow view, Figure 5, is
FIG. 1 is an enlarged cross-sectional view of main parts showing the eccentric parts of the main and sub-crankshafts, FIG. 6 is a view taken along arrow B in FIG. 5, and FIG. 7 is a main part showing the orbiting scroll and frame of FIG. 1. Enlarged sectional view, No. 8
The diagram is. FIG. 7 is a view in the direction of arrow C, FIG. 9 is a sectional view showing the machining state of the orbiting scroll in FIG. 7, FIG. 10 is a view in the direction of arrow D in FIG. 9, and FIG. 11 is a view of the conventional example. It is a sectional view showing a processing state of an orbiting scroll. 1...Airtight container, 2...Fixed scroll, 3...
Rotating frame C1-) Li, 3 a... base plate, 4...
Frame, 5...Main crankshaft, 6...Sub-crankshaft, 9...Protrusion, 10...Refrigerant gas communication hole, 12
．． 13... Eccentric part, 14... Eccentric bushing, 15.
...Annular elastic body, 15a...Star-shaped annular metal plate, 15b
...Aggregation of metal plates, 16... Bearing, 18... Concave groove, 19... Rotor, 2o... Stator, 24...
・Claw parts.

Claims (1)

[Claims] 1. An electric motor and a compression mechanism connected to the electric motor are housed in an airtight container, each having a spiral wrap on a base plate, and each wrap having a spiral shape. a fixed scroll and an orbiting scroll that form a compression chamber by meshing with each other; a main crankshaft that transmits rotational force to the orbiting scroll; a frame that includes a bearing that rotates the main crankshaft; the frame and the orbiting scroll; A scroll compressor comprising a rotation prevention mechanism that maintains an angular positional relationship with the main crankshaft, wherein a bearing for rotating the main crankshaft is supported by the frame via an annular elastic body. . 2. The scroll compressor according to claim 1, wherein the annular elastic body is formed of a star-shaped annular metal plate. 3. The scroll compressor according to claim 1, wherein the annular elastic body is constituted by an assembly of metal plates mounted on each circumference of the outer circumference of the bearing and the inner circumference of the frame. 4. An electric motor and a compression mechanism unit connected to the electric motor are housed in a sealed container, each having a spiral wrap on a base plate, and by meshing each wrap, a compression chamber is formed. a fixed scroll and an orbiting scroll that form the orbiting scroll; a main crankshaft that transmits rotational force to the orbiting scroll; a frame that includes a bearing that rotates the main crankshaft; and maintaining an angular positional relationship between the frame and the orbiting scroll. In a scroll compressor equipped with an anti-rotation mechanism, the anti-rotation mechanism is composed of a plurality of sub-crankshafts each having an eccentric portion, and the bearings supporting the sub-crankshafts have different centers of inner and outer diameters. A scroll compressor characterized by an eccentric bush. 5. An electric motor and a compression mechanism unit connected to the electric motor are housed in a sealed container, each having a spiral wrap on a base plate, and by meshing each wrap, a compression chamber is formed. a fixed scroll and an orbiting scroll that form the orbiting scroll; a main crankshaft that transmits rotational force to the orbiting scroll; a frame that includes a bearing that rotates the main crankshaft; and maintaining an angular positional relationship between the frame and the orbiting scroll. A scroll compressor equipped with an anti-rotation mechanism, characterized in that the base plate of the orbiting scroll that rotates eccentrically at the inner diameter of the frame has a concave groove formed along the outer periphery of the base plate. scroll compressor. 6. A claim characterized in that the rotation prevention mechanism is constituted by a plurality of sub-crankshafts having eccentric portions, and the bearings supporting the sub-crankshafts are eccentric bushes whose inner and outer diameters have different centers. 6. The scroll compressor according to any one of 1 to 5. 7. The scroll according to any one of claims 1 to 6, wherein the base plate of the orbiting scroll that rotates eccentrically at the inner diameter of the frame has a concave groove formed along the outer periphery of the base plate. compressor. 8. The scroll compressor according to any one of claims 1 to 7, characterized in that a refrigerant gas passage hole is formed in the outer circumference of the fixed scroll, and a cylindrical projection is formed above the passage hole. 9. Form a concave groove along the outer periphery of the base plate of the scroll, insert a locking claw part into this concave groove, apply a load almost vertically downward, and crank the base plate to the reference surface. A method for manufacturing a scroll characterized by processing the top surface of the plate and the spiral wrap.