JP2770630B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for an air conditioner, a refrigerator and the like.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view showing an example of a conventional scroll compressor.
1a is a joint surface between the fixed scroll 1 and the frame 4, 2 is an orbiting scroll, and 3 is a discharge port for discharging fluid compressed in a compression chamber formed by the fixed scroll 1 and the orbiting scroll 2. The frame 4 is joined to the closed vessel 5 and divides the high-pressure chamber 6 and the low-pressure chamber 7 by a cylindrical joining surface 4a. The close contact between the frame joining surface 4b and the fixed scroll joining surface 1a prevents the discharge gas from the high-pressure chamber 6 from entering the suction chamber 8.

Reference numeral 9 denotes a crankshaft. The crankshaft 9 is supported by a bearing 4c of the frame 4 and a sub-frame 10, and transmits the driving force of the motor rotor 11 and the motor stator 12 to the orbiting scroll 2. . Reference numeral 13 denotes an oil pump element for supplying lubricating oil to bearings and sliding parts, and reference numeral 14 denotes an Oldham ring.

Next, the operation of the scroll compressor will be described. The crankshaft 9 is rotated by the driving force generated by the motor rotor 11 and the motor stator 12, and the orbiting scroll 2 does not rotate through the Oldham ring 14 but makes a revolving motion. With this, fixed scroll 1
The suction chamber 8 formed between the and the orbiting scroll sucks the gas on the low pressure side filled in the low pressure chamber 7, gradually compresses the gas, and discharges the gas from the discharge port 3 into the high pressure chamber 6.

[0005]

In THE INVENTION It is an object of the above, in the conventional scroll compressor, the compressor housing 5 is joining surface 4a of the frame 4, for sealing and dividing the high pressure chamber 6 and the low-pressure chamber 7, fitted Ri fastening It is necessary to Due to this tightening force, the joint surface 4b of the frame 4, which is the joint surface with the fixed scroll 1, is deformed so that the outer peripheral side is high and gradually inclines inward as shown in FIG. Therefore, the fixed scroll joint surface 1a is flat as shown in FIG. 9, so that the joint surface 4b of the frame 4 and the fixed scroll joint surface 1a are in a line joint state at the time of assembly, and a sufficient sealing surface cannot be secured. However, the high-pressure gas in the high-pressure chamber 6 leaks to the suction chamber 8, and the performance is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to secure an effective seal surface at a joint surface between a fixed scroll and a frame and to obtain a scroll compressor having good performance. And

[0007]

In order to achieve the above object, the following configuration is provided. That is, the fixed scroll and the orbiting scroll combined with the fixed scroll are housed in a closed container together with the electric motor, and a frame that divides the closed container into a discharge pressure space and a suction pressure space is provided in the closed container. Is provided on the frame via a bearing, and a crankshaft is provided for engaging with the orbiting scroll, and the crankshaft is driven by the electric motor to cause the orbiting scroll to perform an oscillating motion,
In a scroll compressor configured to compress and discharge a fluid in a compression chamber formed between the fixed scroll and the orbiting scroll, one of a joint surface of the frame to be joined and a joint surface of the fixed scroll. The joining surface is formed so as to be gradually inclined inward from the outer peripheral side, so that when the frame and the fixed scroll are incorporated into the closed container, the two joining surfaces are surface-joined.

Further, a frame is provided in which a fixed scroll and an orbiting scroll combined with the fixed scroll are housed together with an electric motor in a closed container, and the closed container is divided into a discharge pressure space and a suction pressure space. A crankshaft is provided in the closed container, and is supported by the frame via a bearing, and is provided with a crankshaft that engages with the orbiting scroll.
In a scroll compressor, the crankshaft is driven by the electric motor to swing the orbiting scroll, and a fluid is compressed and discharged in a compression chamber formed between the fixed scroll and the orbiting scroll. Forming the joint surface of the fixed scroll as a flat surface, and forming a flexible structure in the vicinity of the joint surface of the fixed scroll,
When the frame and the fixed scroll are incorporated into the closed container, the elastic scroll deforms the flexible structure so that the joint surface of the fixed scroll is surface-joined to the joint surface of the frame.

Further, the joint surface of the fixed scroll is formed into a flat surface, and the joint surface of the frame is formed so as to be gradually raised and inclined inward from the outer peripheral side. Also, the configuration is such that the two joining surfaces are surface-joined at the time of assembling.

[0010]

According to the above-described respective structures, the scroll compressor according to the present invention forms the joint surface between the frame and the fixed scroll in consideration of the fastening distortion between the frame and the closed container. At the time of assembling, the shapes of the joining surfaces of the two coincide with each other, and a good sealing surface can be obtained.

[0011]

【Example】

Embodiment 1 FIG. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The detailed description of the same components as those in the related art is omitted, and the reference numerals in the drawings for the same components as those in the related art are the same as those described above.

FIG. 1 is a sectional view of a fixed scroll according to an embodiment of the present invention.
Is a joint surface with the frame 4. The joining surface 1a is formed so as to gradually incline from the outer peripheral side to the inner side as shown in the drawing. Also, the bonding surface 4b flat frame 4 alone component state as shown in FIG. 8, when the fastening is fitted Ri tighten the closed container 5, the junction surface of the frame 4 is closed vessel 5 4
a receives a compressive force. For this reason, it is deformed as shown by the solid line in FIG. Due to this deformation, the joining surface 4 of the frame 4
b is displaced and inclined so that the outer peripheral side is high and the inner side is low as shown in the figure. In anticipation of this amount of deformation, as shown in FIG. 1, the joint surface 1a of the fixed scroll 1, if formed so as to gradually inclined downward from the outer peripheral side to the inner side, in concluding as shown in FIG. 2 Further, the two joining surfaces 1a and 4b are surface-joined, and a good sealing surface can be obtained, so that the discharge gas of the high-pressure chamber 6 can be prevented from entering the suction chamber 8. Therefore, it is possible to prevent a decrease in compressor performance due to gas leakage, and to obtain a scroll compressor having good performance.

Embodiment 2 FIG. FIG. 3 is a sectional view of a fixed scroll 1 showing another embodiment of the present invention. The joining surface 1a is formed as a flat surface, and a slit 1 is provided near the joining surface 1a.
b is provided. By this slit 1b, the joining surface 1a
Is a flexible structure portion, and elastically deforms when fastened to the frame 4 as shown in FIG. This frame 4 has a flat joining surface 4b in a single component state. When the fixed scroll 1 is fastened to the closed container 5, the fixed scroll 1 undergoes elastic deformation as described above, and its joint surface 1 a
Deforms obliquely so as to decrease from the outer peripheral side to the inner side. Therefore, the joint surface 1a of the fixed scroll 1 is elastically deformed so as to abut the joint surface 4b of the frame 4 by the tightening force of the bolts at the time of fastening to the frame 4, and the joint surface 1a of the fixed scroll 1 and the frame 4 Bonding surface 4b
Means that a good sealing surface is formed.

The formation of the slit 1b can be easily carried out by machining, and when the frame 1 is fastened to the frame 4, the joining surface 1a of the fixed scroll 1 automatically comes into close contact. Compared to forming the surfaces 1a and 4b so as to be gradually inclined from the outer peripheral side to the inner side, the dimensional control is easy and the processing is simple.

Embodiment 3 FIG. FIG. 5 is a sectional view of a frame 4 according to another embodiment of the present invention, and 4b is a joint surface of the frame 4. The joint surface 4b of the frame 4 is formed so as to be gradually raised and inclined from the outer peripheral side to the inner side in a single component state. Further, the inclination angle, as shown by the solid line in FIG. 6, when fitted Ri tighten the frame 4 in a sealed container 5, the bonding surface of the frame 4 4
It is set so that b is deformed and becomes flat.

[0016] bonding surface 4b in this single component state, a frame 4 which is formed so as to gradually raised inclined inwardly from the outer circumferential side, is fastened by tightening Ri fitted in a sealed container 5, the frame 4
Receives a compressive force on the joint surface 4 a with the closed container 5. Therefore, it undergoes deformation as shown in FIG. With this deformation,
Although the joint surface 4b is displaced, the displacement amount on the inner side of the frame 4 and the displacement amount on the outer peripheral side are different. If it is formed as shown in FIG. 5, the joint surface 4 a of the frame 4 will have a flat shape without inclination after fastening to the closed container 5. Also, the joining surface 1a of the fixed scroll 1
Is formed into a flat shape as shown in FIG. 7, so that the joining surfaces 1a and 4b are surface-joined to each other by fastening them, and a good sealing surface is obtained. Therefore, the high pressure chamber 6
Of the discharge gas is prevented from entering the suction chamber 8, and a scroll compressor having good performance in which a decrease in compressor performance due to gas leakage is prevented can be obtained.

[0017]

As described above, according to the present invention, one of the joining surface of the frame and the joining surface of the fixed scroll is formed so as to be gradually inclined from the outer peripheral side to the inner side. When the frame and fixed scroll are assembled inside, the two joint surfaces are surface-joined, so that both joint surfaces are in close contact and a good sealing surface is obtained, and the discharge gas from the high-pressure chamber enters the suction chamber. This can prevent the compressor performance from deteriorating due to gas leakage, and provide a scroll compressor with good performance.

The fixed scroll joint surface is formed flat and a flexible structure is formed in the vicinity of the fixed scroll joint surface. The joint surface of the fixed scroll is joined to the joint surface of the frame by the elastic deformation of the structure, so that both joint surfaces can be in close contact to form a good sealing surface, and the discharge gas of the high-pressure chamber is reduced. It is possible to obtain a scroll compressor having good performance in which the intrusion into the suction chamber can be prevented, and the performance of the compressor can be prevented from lowering due to gas leakage.

Further, the joint surface of the fixed scroll is formed in a flat shape, and the joint surface of the frame is formed so as to be gradually raised and inclined inward from the outer peripheral side, so that the frame and the fixed scroll are assembled in the closed container. sometimes, by the joining surfaces is such that the surface bonding, when fastened with a tightening Ri fit the frame to the closed container, the bonding surface of the frame becomes flat shape, the junction surface between the fixed scroll and the frame is good in close contact It is possible to obtain a sealing surface, prevent discharge gas from the high-pressure chamber from entering the suction chamber, and obtain a scroll compressor having good performance in which compressor performance is prevented from being deteriorated due to gas leakage.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing an assembled state of the fixed scroll according to the embodiment of the present invention.

FIG. 3 is a sectional view showing a fixed scroll according to another embodiment of the present invention.

FIG. 4 is a sectional view showing an assembled state of a fixed scroll according to another embodiment of the present invention.

FIG. 5 is a sectional view showing a frame according to another embodiment of the present invention.

FIG. 6 is a sectional view showing a deformed state of a frame according to another embodiment of the present invention.

FIG. 7 is a sectional view showing a conventional scroll compressor.

FIG. 8 is a sectional view showing a modification of a conventional frame.

FIG. 9 is a cross-sectional view showing an assembled state of a conventional fixed scroll and a frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 1a Fixed scroll joint surface 1b Fixed scroll flexible structure 2 Oscillating scroll 4 Frame 4b Joint surface with frame fixed frame 4c Frame bearing 9 Crankshaft 11 Motor rotor 12 Motor stator

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-164181 (JP, A) JP-A-3-15686 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 18/02

Claims (3)

(57) [Claims] 1. A frame for accommodating a fixed scroll and an orbiting scroll combined with the fixed scroll together with an electric motor in a closed container, and dividing the closed container into a discharge pressure space and a suction pressure space. A crankshaft is provided in the closed container, and is supported by the frame via a bearing, and is provided with a crankshaft that engages with the orbiting scroll.
In a scroll compressor, the crankshaft is driven by the electric motor to swing the orbiting scroll, and a fluid is compressed and discharged in a compression chamber formed between the fixed scroll and the orbiting scroll. One of the joint surfaces of the frame and the fixed scroll to be joined is formed so as to be gradually inclined inward from the outer peripheral side, and when the frame and the fixed scroll are incorporated into the closed container. A scroll compressor characterized in that both joint surfaces are surface-joined. 2. A frame for accommodating a fixed scroll and an orbiting scroll combined with the fixed scroll together with an electric motor in a closed container and dividing the closed container into a discharge pressure space and a suction pressure space. A crankshaft is provided in the closed container, and is supported by the frame via a bearing, and is provided with a crankshaft that engages with the orbiting scroll.
In a scroll compressor, the crankshaft is driven by the electric motor to swing the orbiting scroll, and a fluid is compressed and discharged in a compression chamber formed between the fixed scroll and the orbiting scroll. Forming the joint surface of the fixed scroll as a flat surface, and forming a flexible structure in the vicinity of the joint surface of the fixed scroll,
A scroll compressor characterized in that, when a frame and a fixed scroll are incorporated in a closed container, the elastic scroll deforms the flexible structure so that the joint surface of the fixed scroll is surface-joined to the joint surface of the frame. 3. A joint surface of the fixed scroll is formed in a flat surface shape, and a joint surface of the frame is formed so as to be gradually raised and inclined inward from an outer peripheral side. 2. The scroll compressor according to claim 1, wherein the two joining surfaces are surface-joined at the time of assembling.