JP3255504B2 - 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, and more particularly to a scroll compressor having a simple structure, high quality and high reliability, which is used for a refrigerator such as an air conditioner or a refrigerator. .

[0002]

2. Description of the Related Art In recent years, scroll compressors have been employed to reduce vibration and noise of compressors. In this scroll compressor, a check valve for preventing the backflow of the refrigerant and the refrigerating machine oil when the operation is stopped is indispensable. The structure in which this check valve is provided on the suction side is disclosed in
34312.

The function of this check valve will be described with reference to FIGS. 2 and 3 are partially enlarged views showing a suction chamber and a suction passage of the scroll compressor. During the operation of the compressor, the check valve 23 is at a lower position as shown in FIG. 3 due to the suction gas pressure, and the suction gas passes through the upper portion thereof and is sucked into the compression chamber. When the operation is stopped, the check valve 23 is lifted to the position shown in FIG. 2 by the gas flow from the high pressure side to the low pressure side, and the passage between the end face of the seal collar 21 and the suction side in the plane of the check valve 23 is formed. It is closed to prevent backflow of refrigerant and refrigerating machine oil.

[0004] In the prior art, this check valve is generally formed by sintering as a processing means which can be manufactured at a low cost and can satisfy the required functions. For this reason, there has been a problem that there are many holes on the seal surface and leakage defects are very large. If the leakage of the seal surface is large, there is a problem that the compressor reverses due to the backflow of the gas, and there is a problem of generating an abnormal sound and a problem of adversely affecting the main body and electric components due to generation of a back electromotive force. In particular, room air conditioners and refrigerators for ordinary households are very problematic because they are sensitive to noise. Furthermore, if there is much leakage from the seal surface, the refrigerating machine oil in the compressor is taken out to the outside when flowing backward, and there is a problem that the oil supply to the bearings and the like becomes insufficient and the reliability of the compressor is reduced.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and it is possible to reduce a leakage failure of a seal portion between a check valve and a seal collar, and at the same time, it is comfortable as an air conditioner and a refrigerator. To provide a highly reliable scroll compressor.

[0006]

In order to achieve the above object, a structure of a scroll compressor according to the present invention is to house an electric motor and a compression mechanism connected to the electric motor in a closed container. A fixed scroll and an orbiting scroll having a spiral wrap standing upright on each base plate and engaging the wraps with each other to form a compression chamber; and a crankshaft for transmitting a rotational force to the orbiting scroll. And a frame provided with a bearing for rotating the crankshaft, and a rotation preventing mechanism for maintaining an angular relationship between the frame and the orbiting scroll, wherein the scroll compressor includes the fixed scroll and the orbiting scroll. A check valve and a seal collar are provided on the suction side of the compression chamber to prevent backflow from the high pressure side to the low pressure side when the compressor is stopped. To have a check valve structure formed, in which filling the voids present in the sintered molded the check valve.
(First Means) In order to achieve the above object, the constitution of the second means is based on the same premise as that of the first means. Then, the pores on the check valve seal surface are filled by attaching an oxide film to the surface. (Second Means) Furthermore, the structure of the means of claim 3 for achieving the above object is formed by the same fixed scroll and orbiting scroll as described above on the same premise as the first means. The suction side of the compression chamber has a check valve structure consisting of a check valve and a seal collar to prevent backflow from the high pressure side to the low pressure side when the compressor is stopped. It uses a light specific gravity material such as a resin material. (Third means)

[0007]

The operation of the above means is as follows.

[0008] The function of the check valve structure of the first means, the second means and the third means is the same as that of the conventional one. First, the first
The function of the second means is as follows. In the check valve structure provided on the suction side of the compression chamber formed by the fixed scroll and the orbiting scroll, the sealing property between the check valve and the seal collar is improved by performing steam treatment. It is possible to improve and greatly reduce leakage defects. For this reason, the air conditioner and refrigerator equipped with this scroll compressor can reduce the reverse phenomenon caused by the gas flow from the high pressure side to the low pressure side when the compressor is stopped, and generate abnormal noise and back electromotive force. The generation can suppress adverse effects on the main body and electric appliances. Especially in room air conditioners and refrigerators for general households,
It is sensitive to noise and can reduce abnormal sounds, which is very effective in terms of comfort. Further, since the leakage of the seal surface can be reduced, there is no fear that the refrigerating machine oil in the compressor is taken out to the outside, and it is possible to supply a sufficient amount of oil to bearings and the like, thereby providing a highly reliable scroll compressor.

The function of the third means is to improve the followability of the check valve which operates when the compressor is stopped by using a light specific gravity material such as an aluminum material or a resin material. As a result, the reverse rotation phenomenon at the time of stoppage can be suppressed, and the occurrence of abnormal noise and the generation of back electromotive force can suppress the adverse effects on the main body and the electric components. Further, as an effect of improving the followability of the check valve, it is possible to provide a highly reliable scroll compressor which can suppress the refrigerating machine oil in the compressor from being taken out to the outside. Further, when a resin material is used for the check valve, an impact sound is generated when the check valve collides with the mating seal member when the compressor is stopped, but this noise can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of a scroll compressor according to one embodiment of the present invention, and FIGS. 2 and 3 are longitudinal sectional views showing a check valve structure. First, the overall configuration will be described.

In the scroll compressor shown in FIG. 1, a pump section (compression mechanism section) is accommodated in an upper portion of a closed vessel 1, and an electric motor section is accommodated in a lower portion. The pump section mainly includes the fixed scroll 2, the orbiting scroll 3, the frame 4, and the Oldham ring 11. A suction pipe 22 connected to an external cycle is press-fitted into the suction port 7 of the fixed scroll 2.

The fixed scroll 2 and the orbiting scroll 3 form a compression chamber 6 by engaging spirally-shaped wrap portions standing upright on the respective base plate surfaces toward each other inwardly.

An eccentric portion 5a of the crankshaft 5 is rotatably fitted into the boss portion of the orbiting scroll, and an Oldham ring 11 slides in a groove of the base plate portion and a groove (not shown) of the frame 4. It is arranged freely.

The frame 4 is provided with a bearing surface for supporting the base plate of the orbiting scroll 3, a surface on which the Oldham ring 11 slides, a thrust surface for supporting the crankshaft 5, and a main bearing. Further, the outer peripheral portion of the frame has a fixed scroll 2
And the bolt 13, and the outer peripheral side surface is fixed to the closed container 1 by spot welding.

A rotor 10 constituting an electric motor is fitted to the crankshaft 5 by press fitting or the like, and a stator 9 constituting the electric motor is fixed in the closed casing 1 by shrink fitting or the like.

Reference numeral 16 denotes a bearing for supporting a lower portion of the crankshaft 5.

Next, the operation of the scroll compressor and the oil supply mechanism will be described.

The rotor 10 receives a rotational force from the stator 9 to rotate the crankshaft 5, and the orbiting scroll 3 eccentrically rotates (revolves) without rotating by the action of the Oldham ring 11. The refrigerant gas sucked through the suction pipe 22 by the eccentric rotation of the orbiting scroll 3 is gradually compressed in the compression chamber 6 from the suction port 7 of the fixed scroll 2, and is discharged into the closed casing 1 from the discharge port 8. The released refrigerant gas cools the motor unit and is supplied from the discharge pipe 14 to the external cycle.

The supply mechanism employs a differential pressure oil supply method, and supplies the refrigerating machine oil 15 at the lower part of the compressor to the main bearing orbiting scroll bearing and other sliding parts by the differential pressure between the pressure in the intermediate pressure chamber 12 and the discharge pressure. . The intermediate pressure chamber 12 forms a room at an intermediate pressure between the suction pressure and the discharge pressure by two intermediate pressure holes (not shown) communicating with the compression chamber 6 on the base plate of the orbiting scroll 3. Due to the pressure difference, the refrigerating oil supply 15 passes through the through hole 5a inside the crankshaft, and the orbiting scroll bearing,
The main bearing is refueled.

Further, the refrigerating oil that has entered the intermediate pressure chamber 12 is supplied from the intermediate pressure hole of the orbiting scroll 3 and the outer periphery of the base plate.
The oil is supplied to the compression chamber 6 and discharged from the discharge port 8 together with the refrigerant gas into the closed container 1.

An embodiment of the present invention will be described with reference to FIGS.

First, the structure of the check valve will be described. When the compressor is operated, the refrigerant gas passes through the suction passage 7, and the suction gas pressure causes the check valve 23 to be pushed down to a lower position as shown in FIG. 3, and a space communicating with the compression chamber 6 is formed above the check valve 23. Is done. Thereby, the suction gas passes through the space and is sucked into the compression chamber 6. Further, the compressed refrigerant gas is discharged from the discharge port 8 into the closed container 1. Discharge port 8
The high-pressure gas discharged from the space is supplied from the upper space of the closed casing 1 to a lower space for accommodating an electric motor and the like through a notch or a communication hole provided on an outer peripheral portion of a pump section forming a compression mechanism section. At this time, the stator 9 forming the electric motor is cooled by the flow of the gas, and the high-pressure gas passes through the space of the electric motor and the like, so that the refrigeration for lubrication is discharged in the form of a mist together with the refrigerant gas from the discharge port 8. Machine oil is separated,
High pressure refrigerant gas is returned from the discharge pipe 14 to the external cycle. When the operation is stopped from the operation state, the compression chamber 6,
Due to the force of the high-pressure refrigerant gas flowing back from the closed vessel 1 and the discharge pipe to the external cycle toward the low-pressure side in front of the suction port 7, and the spring 26 provided below the check valve 23. The check valve 23 is pushed back to the position shown in FIG. 2 to close the passage between the end face of the seal collar 21 and the plane of the check valve 23 to the suction side, thereby preventing the refrigerant from flowing backward, and allowing the refrigerating machine oil 15 at the lower part of the compressor to flow. It is prevented from being taken out of the compressor through the through-hole 5b of the crankshaft 5, which is an oil supply path to the sliding portion, the orbiting scroll bearing, the frame bearing, the intermediate pressure chamber 12, the intermediate pressure hole, the compression chamber 6, and the like. Things.

At this time, the space between the suction port 7 and the compression chamber 6 is sealed by the end face of the seal collar 21 and the plane of the check valve 23. The check valve 23 has a hole like a sintered material. In the case of a material, holes serving as concave portions are scattered in the plane portion of the check valve 23 and the sizes thereof are varied, so that the refrigerant flows backward from a large portion of the concave portion and the refrigerating machine oil flows into the suction port. In many cases, leakage was poor. If the leakage of the sealing surface is large, the compressor may be reversed due to the backflow of the gas, causing an abnormal sound or generating a back electromotive force, which may adversely affect the main body and electric components. This is because, as a condition that can actually occur in the absence of a check valve experimentally, a stop with a pressure difference of 25 kg / cm ² ,
Reverse rotation occurs at 000 rotations, and a voltage close to 200 V is generated as a back electromotive force. Also, if there is a lot of leakage from the seal surface, when the refrigerant flows backward, the refrigerating oil 15 at the lower part of the compressor passes through the through hole 5b of the crankshaft 5 which is an oil supply path to the sliding portion, the orbiting scroll bearing, the frame bearing, Then, the oil is taken out of the compressor through the intermediate pressure hole, the compression chamber 6, and the like, and the amount of oil is reduced. As a result, there is a problem that the oil supply to the bearings and the like becomes insufficient and the reliability of the compressor is reduced.

For this reason, in this embodiment, as a means for filling the pores which cause the leakage failure, the non-return valve 23 formed by sintering is subjected to steam treatment so that an oxide film is adhered to the surface. Further, as another dissimilar material, a molybdenum disulfide is adhered by performing a defric coating process. Thereby, the above-mentioned problem can be solved and a comfortable and highly reliable scroll compressor can be provided.

Next, an embodiment of the third invention will be described. The check valve moves in the push-up direction due to the flow of gas when the compressor is stopped. Therefore, the lighter the check valve itself, the better the followability. In the present embodiment, the followability of the check valve that operates when the compressor is stopped is improved by using a light specific gravity material such as an aluminum material or a resin material instead of the heavy specific gravity material in the check valve structure. I do. As a result, the reverse rotation phenomenon at the time of stoppage can be suppressed, and the occurrence of abnormal noise and the generation of back electromotive force can suppress the adverse effects on the main body and the electric components.
Further, as an effect of the improvement of the followability of the check valve, it is possible to suppress the carry-out of the refrigerating machine oil 15 in the compressor to the outside, thereby providing a highly reliable scroll compressor. Further, when a resin material is used for the check valve, an impact sound is generated when the check valve collides with the mating seal member when the compressor is stopped, but this noise can be reduced. In addition, since the aluminum material or the resin material does not have a hole, it is possible to suppress a leak failure from the sealing surface.

[0026]

According to the present invention, in the check valve structure provided on the suction side of the compression chamber, leakage of the backflow from the high pressure side to the low pressure side when the compressor is stopped can be reduced, and abnormal noise caused by the reverse rotation phenomenon can be reduced. It is possible to suppress the adverse effects on the main body and electric appliances due to generation and generation of back electromotive force. Further, since the leakage of the seal surface can be reduced, there is no fear that the refrigerating machine oil in the compressor is taken out to the outside, and it is possible to supply a sufficient amount of oil to bearings and the like, thereby providing a highly reliable scroll compressor.

The use of a low specific gravity material such as an aluminum material or a resin material has the effect of improving the followability of the check valve that operates when the compressor is stopped and preventing a delay in closing. As a result, the reverse rotation phenomenon at the time of stoppage can be suppressed, and the occurrence of abnormal noise and the generation of back electromotive force can suppress the adverse effects on the main body and the electric components. Further, as an effect of improving the followability of the check valve, it is possible to provide a highly reliable scroll compressor which can suppress the refrigerating machine oil in the compressor from being taken out to the outside. Further, when a resin material is used for the check valve, an impact sound is generated when the check valve collides with the mating seal member when the compressor is stopped, but this noise can be reduced.

[Brief description of the drawings]

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

FIG. 2 is an enlarged view of the check valve structure (when the compressor is stopped).

FIG. 3 is an enlarged view of the check valve structure (when the compressor is operating).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Fixed scroll, 3 ... Orbiting scroll, 4 ... Frame, 5 ... Crankshaft, 6 ... Compression chamber, 7 ...
Suction port, 8 ... discharge port, 9 ... stator, 10 ... rotor, 1
1, ... Oldham ring, 12 ... intermediate pressure chamber, 13 ... bolt, 14 ... discharge pipe, 15 ... refrigerating machine oil, 16 ... lower bearing, 21 ... seal collar, 22 ... suction pipe, 23 ...
Check valve, 26 ... spring,

Continuing on the front page (72) Inventor Koichi Sekiguchi 800, Tomita, Odai-machi, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Living Equipment Division, Hitachi, Ltd. (72) Inventor Tatsuya Wakana 800, Tomita, Ohira-cho, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture Inside the Living Equipment Division of Hitachi, Ltd. Field (Int.Cl. ⁷ , DB name) F04C 18/02 311 F04C 29/00

Claims (3)

(57) [Claims] An electric motor and a compression mechanism connected to the electric motor are housed in an airtight container. The compression mechanism has spiral wraps that stand upright on two base plates, respectively. A fixed scroll and an orbiting scroll that form a compression chamber by engaging the respective wraps with each other, a crankshaft that transmits a rotational force to the orbiting scroll, and a frame including a bearing that receives rotation of the crankshaft; A rotation preventing mechanism for maintaining an angular positional relationship between a frame and the orbiting scroll is provided, and a check valve is provided on a suction side of a compression chamber formed by the fixed scroll and the orbiting scroll to prevent backflow of refrigerant and refrigerating machine oil. In the scroll compressor, the check valve is made of a material having a hole, and a treatment for filling the hole or a different material is attached to the check valve. Scroll compressor to be. 2. The scroll compressor according to claim 1, wherein said check valve is formed by sintering, and said check valve is subjected to a steam process. 3. The scroll compressor according to claim 1, wherein the check valve is made of a light specific gravity material such as an aluminum material or a resin material.