JP2003083269A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor controlling a reverse turn of turning scroll at a recess of operation or a backward flow of lubricating oil from a lubricating oil reservoir to a suction side, and of a simple structure superior in workability and assemblability. SOLUTION: This scroll compressor is provided with a compressing mechanism part 2 for compressing refrigerant with utilizing the turning scroll 6, a back pressure chamber 24 formed between a bearing frame 8 and a back surface of the turning scroll 6, a suction chamber side communicating hole 37 for communicating the back pressure chamber 24 side and the compressing mechanism part 2, the lubricating oil reservoir 5 for supplying lubricating oil to the compressing mechanism part 2 side through the suction chamber side communication hole 37, a back pressure controlling valve 31 for regulating pressure in the back pressure chamber 24 with using a designated regulating pressure, and a back pressure communicating hole opening and closing valve 41 for controlling supply of lubricating oil under a fixed conditions.

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 in, for example, a refrigerating air conditioner or a refrigerator for vehicles such as passenger cars.

[0002]

2. Description of the Related Art First, the structure and operation of a conventional scroll compressor will be described mainly with reference to FIG. 6, which is a vertical sectional view of a conventional scroll compressor.

In a conventional scroll compressor, a compression mechanism portion 2 is provided in a closed container 1, an electric motor 3 for driving the compression mechanism portion 2 below the compression mechanism portion 2, and a rotational force of the electric motor 3 is applied to the compression mechanism portion. 2, and a lubricating oil sump 5 is provided in the lower portion of the closed container 1.

The compression mechanism section 2 is a combination of an orbiting scroll 6 having a spiral wrap and a fixed scroll 7 facing each other. Then, it is sandwiched and held. Further, the cable of the winding coil of the electric motor 3 is connected to the introduction terminal sealed in the closed casing 1, drawn out of the closed casing 1, and driven and controlled by an external electric motor control power supply.

The sucked refrigerant gas is sucked through a suction pipe 9 which penetrates from the outer circumference of the end plate 7a of the fixed scroll 7 in the radial direction, and enters the outer circumference of a compression chamber 10 formed by the fixed scroll 7 and the orbiting scroll 6. Inhalation chamber 10a located
More flow into the compression chamber 10b. The orbiting scroll 6 is prevented from rotating by a rotation preventing mechanism 11, and performs an orbiting motion via an orbiting bearing 12 by an eccentric drive shaft 4 to compress and discharge the sucked refrigerant gas while sequentially transferring it to the center of the compression chamber 10. The first discharge chamber 1 from the outlet 13 via the reed valve 14.
Discharge to 5.

Thereafter, the first discharge chamber 1 which is compressed and discharged
The high-pressure gas of No. 5 passes through the first descending communication passage 16 in the bearing frame 8, passes through the partition wall 17, the compression mechanism section 2 and the second discharge chamber 18 surrounded by the electric motor 3, and then descends into the second descending chamber in the electric motor 3. It descends through the communication passage 19. Further, after cooling the electric motor 3 through the first ascending passage 20 provided on the outer periphery of the electric motor 3, it is pumped out of the machine through the discharge pipe 21 through the second ascending passage (not shown) on the outer periphery of the compression mechanism portion 2. To be done. During this time, the lubricating oil in the discharge gas is repeatedly separated by centrifugal separation and collision, and drops into the lubricating oil sump 5.

The drive shaft 4 is supported by an upper main bearing 22 and a lower main bearing 23 fixed to the bearing frame 8, and the electric motor 3
It is rotated by the driving force of. The back pressure chamber 24 formed between the bearing frame 8 and the orbiting scroll 6 is maintained at an intermediate pressure between the suction pressure and the discharge pressure as described later, and the pressure of the back pressure chamber 24 causes the orbiting scroll 6 to move. The structure is such that it is pressed against the fixed scroll 7.

An oil supply hole 25 is provided in the drive shaft 4, and a minute passage 26 (may be a bearing gap) is provided in the sliding surface of the drive shaft 4 with each bearing portion in the axial direction. On the electric motor 3 side of the upper main bearing 22, a lubricating oil groove 29 is provided at a position opposite to a through oil supply hole 28 communicating the minute passage 26 and the oil supply hole 25, and the lubricating oil groove 29 is supplied from the through oil supply hole 28 to the lubricating oil groove 29. Due to the sealing action of the accumulated lubricating oil, the upper main bearing 22 and the drive shaft 4
High pressure gas is prevented from entering the back pressure chamber 24 through the gap.

Further, the lower end of the drive shaft 4 is immersed in the lubricating oil sump 5, and the back pressure chamber 24 and the lubricating oil sump 5 are communicated with each other by the oil supply hole 25, the through oil supply hole 28 and the minute passage 26. Further, although the lubricating oil sump 5 has a discharge pressure, it is decompressed by the minute passage 26 and the back pressure chamber 24 is maintained at an intermediate pressure which is an intermediate pressure between the discharge pressure and the suction pressure.
Therefore, the lubricating oil is stored in the lubricating oil sump 5 to which the discharge pressure is applied.
Is supplied to the upper main bearing 22 and the slewing bearing 12 through the oil supply hole 25 due to the pressure difference between the back pressure chamber 24 and the back pressure chamber 24, and the bearings are lubricated and then supplied to the back pressure chamber 24. The lubricating oil accumulated in the back pressure chamber 24 is guided through the back pressure control valve 31 to the suction chamber 10a,
Then, after entering the compression chamber 10b to lubricate the seal and the sliding portion of the compression mechanism portion 2, it is discharged together with the discharge gas.

As means for maintaining the back pressure chamber 24 at an intermediate pressure, the lubricating oil groove provided on the drive shaft 4 and the back pressure partition strip on the back of the orbiting scroll 6 provided on the bearing frame 8 and the orbiting scroll 6 are provided. In combination with a pressure reducing valve,
Some scroll compressors do this.

Next, referring to FIG. 7 which is a vertical cross-sectional view of the back pressure control valve 31 of the conventional scroll compressor (however, hatching is slightly different from FIG. 6),
The back pressure control valve 31 will be described in detail.

The back pressure chamber 24 and the suction chamber 10a include a valve-side communication hole 32, an adjustment chamber 34 for accommodating a steel ball 33 serving as a valve,
It communicates with the suction chamber side communication hole 37. Steel ball 3
3 is pressed against the valve-side communication hole 32 by the elastic force of the spring 35, and FIG. 7 shows a state in which the steel ball 33 closes the valve-side communication hole 32. Also, the cap 36 is
The spring 35 is supported and sealed to the fixed scroll 7 so as to prevent the lubricating oil and the refrigerant gas in the adjustment chamber 34 from leaking to the discharge space side.

In the steel ball 33 in the state shown in FIG. 7, the pressure of the back pressure chamber 24 is lower than the valve side communication hole 32, and the spring 35 is higher than the upper side.
And the pressure of the adjusting chamber 34 (the same suction pressure as the suction chamber 10a because it passes through the suction chamber side communication hole 37) are acting, and when the pressure of the back pressure chamber 24 rises, the elasticity of the spring 35 is overcome. The steel ball 33 is pushed upward, the lubricating oil and the gas in the back pressure chamber 24 flow into the adjustment chamber 35, the pressure in the back pressure chamber 24 decreases and returns to the original pressure, and the steel ball 33 also returns to the balance position. Thus, during operation, the opening and closing of the steel ball 33 is controlled by the spring 35 so that the pressure difference between the back pressure chamber 24 and the suction chamber 10a becomes substantially constant.

By the way, the following phenomenon may occur immediately after the compressor stops operating.

That is, when the compressor stops operating, the reed valve 14 closes the discharge port 13 and the suction chamber 10 is closed.
a remains the suction pressure. In the back pressure chamber 24, from the lubricating oil sump 5 to which the discharge pressure is applied, the oil supply hole 25 and the through oil supply hole 2 are provided.
The lubricating oil flows in through 8 and the minute passage 26. Then, since the pressure in the back pressure chamber 24 increases, the back pressure control valve 31 opens,
The lubricating oil in the back pressure chamber 24 flows back to the suction side through the back pressure control valve 31 and the suction chamber 10a and flows out, so that the lubricating oil in the lubricating oil sump 5 is rapidly reduced.

As described above, according to the structure in which the reed valve 14 is provided, the reverse flow of the lubricating oil occurs (although the reverse rotation of the orbiting scroll can be prevented when the operation is stopped), and the lubricating oil in the lubricating oil sump decreases. Insufficient amount of oil supply will occur, causing seizure and wear on sliding parts such as bearings.

According to the construction in which the reed valve 14 is not provided, the reverse flow of the lubricating oil in the lubricating oil sump 5 to the suction side does not occur, but the orbiting scroll 6 reverses due to the pressure difference between the discharge pressure and the suction pressure. Will end up. In other words, according to the configuration without using the conventional reed valve, although the reverse flow of the lubricating oil can be prevented, the orbiting scroll causes the orbiting scroll to rotate in reverse and the inversion noise is generated. It is necessary to increase the number of windings of the wrap to obtain a high compression ratio, and the compressor becomes large (thus, as a result, as described in JP-A-57-73886, the orbiting scroll 6 It is often the case that the reed valve 14 is attached so as not to reverse.

Therefore, as disclosed in Japanese Patent Publication No. 1-34312, a suction check valve using a spring and an opening / closing valve is installed inside the suction pipe 9 to prevent reverse rotation of the orbiting scroll 6 and reverse flow of lubricating oil. Prevented scroll compressors are considered.

[0019]

However, when the suction check valve is attached to prevent the backflow of the lubricating oil when the operation is stopped, the number of parts such as the spring and the on-off valve is increased and the machining accuracy of the suction pipe is improved. Necessity and deterioration of assembly productivity become problems, and when the suction pipe is laterally inserted as in the above-mentioned conventional example (see FIG. 6), the suction valve cannot be installed due to space limitation.

In consideration of the above-mentioned conventional problems, the present invention can suppress the reversal of the orbiting scroll and the backflow of the lubricating oil from the lubricating oil reservoir to the suction side when the operation is stopped, and the workability and the assembly productivity are simplified. Another object is to provide an excellent scroll compressor.

[0021]

[Means for Solving the Problems] The first invention (Claim 1)
Corresponds to a compression mechanism part for compressing a predetermined fluid by using an orbiting scroll, a bearing frame supporting a drive shaft for driving the compression mechanism part, a bearing frame and the orbiting scroll. A back pressure chamber formed between the back surface, a communication hole for communicating the back pressure chamber side and the compression mechanism portion side, and a lubricating oil to the compression mechanism portion side via the communication hole. An oil supply mechanism for supplying, a back pressure adjusting means for adjusting the pressure of the back pressure chamber by utilizing a predetermined adjusting pressure, and for suppressing the supply of the lubricating oil under a predetermined condition. And a refueling suppressing means for the scroll compressor.

In the second aspect of the present invention (corresponding to claim 2), suppressing under the predetermined conditions means suppressing when the driving of the compression mechanism section is stopped. It is a scroll compressor of the invention.

In a third aspect of the present invention (corresponding to claim 3), the refueling suppressing means includes a communication hole blocking member for blocking the communication hole, and the communication hole is blocked under the predetermined condition. As described above, the scroll compressor of the first or second aspect of the invention has the communication hole blocking member position changing means for changing the position of the communication hole blocking member.

According to a fourth aspect of the present invention (corresponding to claim 4), the communication hole blocking member position changing means changes the position of the communication hole blocking member using the generated electromagnetic force. Is a scroll compressor according to the third aspect of the present invention.

In a fifth aspect of the present invention (corresponding to claim 5), the back pressure adjusting means adjusts the pressure of the back pressure chamber by opening and closing the communication hole according to the predetermined adjustment pressure. A back pressure adjusting valve for adjusting the predetermined adjusting pressure so that the communication hole is blocked by the back pressure adjusting valve under the predetermined condition. It is the scroll compressor of the 1st or 2nd this invention which has a pressure change means.

According to a sixth aspect of the present invention (corresponding to claim 6), the adjusting pressure changing means has an electromagnetic coil for changing the predetermined adjusting pressure by utilizing the generated electromagnetic force. It is a scroll compressor of the present invention.

According to a seventh aspect of the present invention (corresponding to claim 7), an electric motor having a coil for driving the drive shaft is provided, and the electromagnetic coil is provided in an airtight container for housing the entire apparatus. It is the scroll compressor according to the fourth or sixth aspect of the invention, which is connected in series or in parallel with the coil of the electric motor.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) First, FIG. 1 which is an enlarged vertical cross-sectional view of a main part of a scroll compressor according to Embodiment 1 of the present invention during a driving operation, and a scroll according to Embodiment 1 of the present invention. The configuration of the scroll compressor according to the present embodiment will be described with reference to FIG. 2, which is an enlarged vertical cross-sectional view of the main part of the compressor when the operation is stopped.

In the structure of the scroll compressor according to this embodiment, the same functional parts as those in the conventional example (see FIG. 6) are designated by the same reference numerals, and the description of the same structure and operation will be omitted. Further, the scroll compressor according to the embodiment of the present invention will be described by taking as an example the case where HFC410A is used as the refrigerant. However, the refrigerant does not contain chlorine such as HFC134a and hydrocarbon (HC), carbon dioxide, and the conventional HCFC22. The same can be applied to the case where a refrigerant such as the above is used, and the same effect can be obtained (the same applies to the following embodiments).

In FIG. 1, reference numeral 41 denotes a back pressure communication hole opening / closing valve which is installed so that the suction side communication hole 37 can be opened and closed. Further, 31 is a back pressure control valve, which is the same as the conventional example of FIG.

The back pressure communication hole opening / closing valve 41 has a suction side communication hole 3
7 and a rod-shaped valve body 43 that is movably installed in the valve guide hole 42 and that opens and closes the suction side communication hole 37 that intersects by the movement, and applies electromagnetic force to the valve body 43. An electromagnetic coil 44, a spring 45 that exerts an elastic force on the valve body 43 in a direction to close the suction side communication hole 37, and a holder 46 that supports the valve body 43, the spring 45, and the electromagnetic coil 44 and installs and fixes them on the fixed scroll 7. It is composed of. Further, an iron piece 46a is installed in the upper part of the inside of the holder 46, the iron piece 46a is magnetized by the magnetic field generated by the electromagnetic coil 44, and an attractive force due to an electromagnetic force acts between the iron piece 46a and the valve body 43, so that the valve body 43 Is pulled up. The electromagnetic coil 44 here is connected to a control power source 47 and its energization is controlled. The electromagnetic coil 44 is energized by interlocking with an energizing switch of the electric motor 3 (see FIG. 6).

In FIG. 1, when the scroll compressor is in operation, the electromagnetic coil 44 is energized by the control power supply 47, and the valve element 43 is pulled up by the action of electromagnetic force to communicate with the suction side. The state where the hole 37 is open is shown.

FIG. 2 shows a state in which the scroll compressor is stopped, and the electromagnetic coil 44 is de-energized by the control power source 47, so that the valve element 43 moves downward in the figure by the action of the elastic force of the spring 45. When the valve body 43 is pushed down, the suction side communication hole 3
7 shows a closed state.

In the present embodiment, the valve body 43 and the valve guide hole 42 have a cylindrical shape in consideration of workability and assemblability, and their cross-sectional diameter is large enough to close the suction side communication hole (φ1). The thickness is φ2, and the gap between the valve guide hole 42 and the valve body 43 is set so that the refrigerant gas and the lubricating oil do not leak (here, about 10 μm). Further, S45C material is used for the valve body 43 in consideration of the action of electromagnetic force, and a coil spring is used for the elastic spring 45 (of course, refrigerant gas, lubricating oil,
These specifications vary depending on the usage conditions).

The back pressure control valve 31 corresponds to the means including the back pressure adjusting means of the present invention. Further, the back pressure communication hole opening / closing valve 41 corresponds to the means including the oil supply suppressing means of the present invention.

Next, the operation of the scroll compressor of this embodiment will be described. While describing the operation of the scroll compressor of the present embodiment, an embodiment of the scroll compression method of the present invention will also be described (the same applies to the following second to third embodiments).

During operation, the valve body 43 is pulled upward and the suction side communication hole 37 is opened as shown in FIG. 1 by the electromagnetic force generated when the electromagnetic coil 44 is energized.
The back pressure control valve 31 functions similarly to the conventional example.

When the operation is stopped, the electromagnetic coil 44 is de-energized and the electromagnetic force does not act, and the valve element 43 is pushed downward by the action of the elastic force of the spring 45 as shown in FIG. The suction side communication hole 37 is closed.

Therefore, even if the back pressure control valve 31 is opened due to the pressure difference between the back pressure chamber 24 and the suction chamber 10a, lubricating oil or gas does not flow from the back pressure chamber 24 to the suction chamber 10a.

Therefore, the lubricating oil in the lubricating oil sump 5 can be prevented from flowing back to the suction side through the back pressure control valve 31 and the suction chamber 10a, and the lubricating oil in the lubricating oil sump 5 can be prevented from being rapidly reduced. .

As described above, according to the configuration of the first embodiment, the intake side communication hole 37 can be closed with the valve body 43 reliably with a simple configuration, and thus the lubricating oil sump 5
It is possible to prevent the backflow of the lubricating oil from the suction side to the suction side, and it is possible to improve the reliability of the scroll compressor at low cost.

Although the valve element 43 is made of the S45C material, it is not limited to this, and needless to say, the same effect can be obtained even if the sectional shape is not limited to a circle but an ellipse or a quadrangle.

The portion of the valve body 43 inserted into the valve guide hole 42 is made of a non-magnetic material such as aluminum or a material having a low magnetic permeability, and the portion of the electromagnetic coil 44 on which the electromagnetic force acts is a magnetic body or a high permeability material. It goes without saying that even if the material is made of a magnetic material, the same operation as in the present embodiment can be realized and the same effect can be obtained.

(Embodiment 2) First, FIG. 3 which is an enlarged vertical sectional view of a main part of the scroll compressor according to Embodiment 2 of the present invention at the time of operating operation, and the scroll according to Embodiment 2 of the present invention. The configuration of the scroll compressor according to the present embodiment will be described with reference to FIG. 4, which is an enlarged vertical cross-sectional view of the main part of the compressor when the operation is stopped.

The scroll compressor according to the present embodiment is characterized in that the back pressure communication hole opening / closing valve 51 and the back pressure control valve 31 are integrally formed, and the steel ball 33 of the back pressure control valve 31 plays two roles. There is a point.

In FIG. 3, reference numeral 51 denotes a back pressure communication hole opening / closing valve, which is a rod-shaped pushing member 53 for pushing the steel ball 33 in the adjusting chamber 34 downward, and a valve guide for inserting the pushing member 53 and regulating its moving direction. A hole 52, an electromagnetic coil 54 that applies an electromagnetic force that pulls the pushing member 53 upward, a spring 55 that pushes the pushing member 53 downward, and acts an elastic force that pushes the steel ball 33 against the valve side communication hole 32, and a pushing member. 53
And a holder cap 56 for internally supporting and fixing the spring 55 and the electromagnetic coil 55 to the fixed scroll 7 (as described in detail later, the electromagnetic force of the electromagnetic coil 54 and the elastic force of the spring 55 are adjusted. It is used as a pressure to regulate the pressure (back pressure) in the back pressure chamber 24 while suppressing the supply of lubricating oil when the operation is stopped).

The holder cap 56 supports the spring 35 of the back pressure control valve 31 and is sealed to the fixed scroll 7 so as to prevent the lubricating oil and the refrigerant gas in the adjusting chamber 34 from leaking to the discharge space side. ing. Here, as in the first embodiment, the energization of the electromagnetic coil 44 is performed in conjunction with the energizing switch of the electric motor 3 (see FIG. 6).

The back pressure communication hole opening / closing valve 51 corresponds to the means including the oil supply suppressing means of the present invention.

Next, the operation of the scroll compressor of this embodiment will be described.

During operation, as shown in FIG. 3, the pushing member 53 is pulled up by the electromagnetic force generated by energizing the electromagnetic coil 54 of the back pressure communication hole opening / closing valve 51, so that the pushing member 53 is pulled up. Does not contact the steel ball 33 of the back pressure control valve 31. Therefore, the back pressure control valve 31 opens and closes the valve side communication hole 32 by the pressure of the back pressure chamber 24 and the pressure of the suction chamber 10a and the elastic force of the spring 35, and the back pressure chamber 24 and the suction chamber 10a.
It is possible to control so that the differential pressure of is almost constant.

When the operation is stopped, the coil 54 is de-energized, so that the pushing member 53 is pushed downward by the action of the elastic force of the spring 55 as shown in FIG. Close 32. Even if the steel ball 33 receives an upward force due to the pressure difference between the back pressure chamber 24 and the suction chamber 10a, the steel ball 33 does not rise upward and the valve side communication hole 32 can be kept closed. The lubricating oil and the refrigerant gas do not flow into the chamber 10a. Therefore, it is possible to prevent the lubricating oil in the lubricating oil sump 5 from flowing back to the suction side via the back pressure control valve 31 and the suction chamber 10a, and it is also possible to prevent a sudden decrease in the lubricating oil in the lubricating oil sump 5.

As described above, according to the configuration of the second embodiment, it is possible to close the valve side communication hole 32 with the steel ball 33 through the pushing member 53 when the operation is stopped. With a simple configuration, it is possible to reliably prevent the backflow of the lubricating oil from the lubricating oil sump 5 to the suction side, and at a low cost, it is possible to improve the reliability of the scroll compressor.

Since the back pressure communication hole opening / closing valve 41 and the back pressure control valve 31 are integrated with each other, the number of parts and the number of processing points can be reduced as compared with the first embodiment. It is possible to improve the property and reduce the cost.

(Third Embodiment) First, the electric motor 63 and the back pressure communication hole opening / closing valve 61 according to the third embodiment of the present invention.
The configuration and operation of the scroll compressor according to the present embodiment will be described with reference to FIG. 5, which is an explanatory diagram of the connection with the control power supply 67.

The scroll compressor of the present embodiment is characterized in that the electromagnetic coil 62 of the back pressure communication hole opening / closing valve 61 is connected in series with one of the coil windings 64 of the electric motor 63 and inside the hermetically sealed container 66 of the compressor. (The configuration and operation of the back pressure communication hole opening / closing valve 61 are the same as the back pressure communication control valve 41 (see FIGS. 1-2) of the first and second embodiments described above).
51 (see FIGS. 3-4)).

That is, more specifically, in the first and second embodiments, each back pressure communication hole opening / closing valve 4 is
1, 51 are the electromagnetic coils 44 (see FIGS. 1-2), 5
4 (see FIGS. 3 to 4) is connected to each control power supply 47, and its energization is controlled together with the energizing switch of the electric motor 3. In these configurations, the control power source 47 is provided separately from the control power source of the electric motor 3, and the introduction terminal (not shown) for pulling out the cables of the electromagnetic coils 44 and 54 from the closed container 1 is also provided separately.

In the present embodiment, as shown in FIG. 5, the electromagnetic coil 62 of the back pressure communication hole opening / closing valve 61 is arranged in series with one of the coil windings 64 of the electric motor 63 inside the hermetically sealed container 66 of the compressor. Connected by. Therefore, when the electric motor 63 is energized from the control power supply 67 during operation of the scroll compressor, the electromagnetic coil 62 of the back pressure communication hole opening / closing valve 61 is also energized, and the back pressure communication hole opening / closing valve 61 is opened. Further, when the operation of the scroll compressor is stopped, the power supply from the control power supply 67 is cut off, so that the back pressure communication hole opening / closing valve 61 is closed when the electric motor 63 is stopped.

As described above, according to the configuration of the third embodiment, it is possible to prevent the backflow of the lubricating oil at the time of the stop as in the above-described first and second embodiments, and to control the electromagnetic power by the control power supply 67 of the electric motor 63. The coil 62 can also be used as a control power source, and the introduction terminal 65 does not need to be separately provided.
The reliability of the scroll compressor can be improved with a configuration that is simpler and cheaper than 2.

Although the electromagnetic coil 62 is connected in series to the coil winding 64 in the third embodiment, it is connected in parallel between the U and V lines of the coil winding 64 in FIG. 5, for example. The same effect can be obtained even with this configuration. Of course, the same effect can be obtained even if the configuration is such that the induced voltage from the U, V, and W lines is used for energization.

The method of connecting the U, V and W wires of the coil winding 64 may be another method. Of course, the electric motor is not limited to the one driven by three phases of U, V and W, and the same effect can be obtained even if the electric motor is driven by two phases or multiple phases or a DC motor.

Further, in the above-described first to third embodiments, the electromagnetic coil is used as the drive means for the back pressure communication hole opening / closing valve, but the same applies even if other drive means such as an electric motor or a fluid machine is used. The effect of is obtained.

Further, in the first to third embodiments, the elastic force of the spring is used as the restoring force of the valve of the back pressure communication hole opening / closing valve, but it is received from, for example, magnetic force or fluid such as refrigerant gas or lubricating oil. The same effect can be obtained by using other restoring force such as force or gravity.

In the above, the first to third embodiments have been described in detail.

Although the communication hole of the present invention is a means including the suction chamber side communication hole 37 in the above-mentioned embodiment, the communication hole is not limited to this, in short, the back pressure chamber side and the compression mechanism portion. Any means for communicating with the side may be used.

Further, the communication hole blocking member of the present invention is a means including the rod-shaped valve body 43 in the above-mentioned first embodiment, but the invention is not limited to this, and in short, in order to block the communication hole. Any means may be used.

Further, although the communication hole blocking member position changing means of the present invention is the means including the electromagnetic coil 44 in the above-described first embodiment, it is not limited to this, but in short,
Any means may be used for changing the position of the communication hole blocking member so that the communication hole is blocked under a predetermined condition.

Further, although the back pressure adjusting valve of the present invention is a means including the steel ball 33 in the above-mentioned present embodiment, the present invention is not limited to this, that is, in short, the communicating hole depending on a predetermined adjusting pressure. Any means may be used for adjusting the pressure in the back pressure chamber by opening and closing.

Further, the adjusting pressure changing means of the present invention is the means including the electromagnetic coil 54 in the second embodiment described above, but the present invention is not limited to this, and in short, the adjusting pressure changing means can be changed under a predetermined condition. Any means may be used for changing the predetermined adjustment pressure so that the communication hole is blocked by the pressure adjustment valve.

In short, according to the present invention, the orbiting scroll is used to compress a predetermined fluid, the compression mechanism portion, the bearing frame supporting the drive shaft for driving the compression mechanism portion, the bearing frame and the orbiting scroll. The back pressure chamber formed between the back pressure chamber and the back surface of the compressor, a communication hole for communicating the back pressure chamber side and the compression mechanism side, and for supplying lubricating oil to the compression mechanism side via the communication hole. Oil supply mechanism section, a back pressure adjusting means for adjusting the pressure of the back pressure chamber using a predetermined adjustment pressure, and the supply of lubricating oil under predetermined conditions (for example, driving the compression mechanism section). And a refueling suppressing means for suppressing the refueling of the scroll compressor.

(1) It is formed between a bearing frame supporting a drive shaft for driving a compression mechanism portion for compressing a predetermined fluid by utilizing the orbiting scroll and the back surface of the orbiting scroll. And (2) a step of supplying lubricating oil to the compression mechanism section side via a communication hole for communicating the back pressure chamber side and the compression mechanism section side, and utilizing a predetermined adjustment pressure. The invention also includes a scroll compression method including a step of adjusting the pressure of the back pressure chamber and a step of suppressing the supply of the lubricating oil under a predetermined condition.

As described above, according to the present invention, for example, a compression mechanism portion including a fixed scroll and an orbiting scroll, a drive shaft for driving the compression mechanism portion, and a main bearing for supporting the drive shaft are provided in a closed container. A bearing frame provided and an electric motor that rotationally drives the drive shaft are provided, and a back pressure communication that communicates the back pressure space formed by the back surface of the orbiting scroll and the bearing frame with the suction chamber of the compression mechanism section. And a back pressure control means for opening and closing the back pressure communication hole to set the pressure in the back pressure chamber to an intermediate pressure between the suction pressure and the discharge pressure, and to store the lubricating oil in the lubricating oil reservoir in the closed container. By the pressure difference between the discharge pressure and the back pressure chamber, the oil is supplied to the back pressure chamber via the oil supply hole provided in the drive shaft and the main bearing sliding portion, and further due to the pressure difference between the back pressure chamber and the suction chamber. The compressor through the back pressure communication hole In a scroll compressor provided with a lubrication mechanism for supplying oil to a portion, a back pressure communication hole opening / closing means for opening the back pressure communication hole when the electric motor is operating and closing the back pressure communication hole when the electric motor is stopped is provided. .

Further, the present invention is characterized in that, for example, the back pressure communication hole opening / closing means has a valve body for opening / closing the back pressure communication hole and a valve body drive section for driving the valve body to open / close. It is the scroll compressor described above.

Further, according to the present invention, for example, the back pressure communication hole opening / closing means is constructed integrally with the back pressure control means, and serves as an opening / closing valve of the back pressure control means for opening / closing the communication hole. And a pressing member that presses the valve body toward the side where the back pressure communication hole is closed, and a valve body drive unit that presses the valve body through the pressing member and closes the back pressure communication hole only when the electric motor is stopped. The scroll compressor described above.

Further, according to the present invention, for example, in the above scroll compressor, the valve body driving section has an electromagnetic coil, and the electromagnetic coil is connected in series or in parallel with the coil of the electric motor. is there.

The present invention is also the scroll compressor described above, wherein, for example, the electromagnetic coil and the coil of the electric motor are connected in the closed container.

Therefore, according to the present invention, for example, since the back pressure communication hole is closed when the compressor is stopped, it is possible to prevent the lubricating oil in the lubricating oil sump from flowing back to the suction side and prevent the reduction of the lubricating oil. Therefore, it is possible to provide a hermetic scroll compressor having a simple structure, good assembly productivity, and high reliability.

Further, by integrally forming the back pressure control valve and the back pressure communication hole opening / closing means, it is compact and the installation space can be reduced, the degree of freedom in design can be maintained, and the number of parts can be reduced. Therefore, the assembly productivity can be improved with a simple structure.

Further, by connecting the electromagnetic coil of the back pressure communication hole opening / closing means and the coil of the electric motor in series or in parallel in the closed container, it is possible to make the structure simpler and more compact.
Since the degree of freedom in design can be maintained and the number of parts can be reduced, the cost can be reduced and the assembling productivity can be improved with a simple structure.

[0080]

As is apparent from the above description,
INDUSTRIAL APPLICABILITY The present invention has an advantage that it is possible to provide a scroll compressor that can suppress the reversal of the orbiting scroll and the reverse flow of the lubricating oil from the lubricating oil reservoir to the suction side when the operation is stopped, and has a simple structure and excellent workability and assembly productivity. Have.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view of a main part of a scroll compressor according to a first embodiment of the present invention during a driving operation.

FIG. 2 is an enlarged vertical sectional view of a main part of the scroll compressor according to Embodiment 1 of the present invention when operation is stopped.

FIG. 3 is an enlarged vertical cross-sectional view of a main part of the scroll compressor according to Embodiment 2 of the present invention during a driving operation.

FIG. 4 is an enlarged vertical sectional view of a main part of the scroll compressor according to Embodiment 2 of the present invention when operation is stopped.

FIG. 5 is an explanatory diagram of connections between an electric motor 63, a back pressure communication hole opening / closing valve 61 and a control power supply 67 according to a third embodiment of the present invention.

FIG. 6 is a vertical sectional view of a conventional scroll compressor.

FIG. 7 is a vertical cross-sectional view of the vicinity of a back pressure control valve 31 of a conventional scroll compressor.

[Explanation of symbols]

1 closed container 2 compression mechanism 3,63 electric motor 4 drive shaft 5 Lubricant oil sump 6 orbiting scroll 7 fixed scroll 8 bearing frame 24 Back pressure chamber 25 lubrication hole 65 Introduction Terminal 31 Back pressure control valve 32 Valve side communication hole 33 steel balls 34 Adjustment room 35 spring 36 cap 37 Inlet side communication hole 41, 51, 61 Back pressure communication hole opening / closing valve 42, 52 Valve guide hole 43 valve body 44, 54 electromagnetic coil 45, 55 spring 46 holder 47, 67 Control power supply 53 Push member 64 coil winding 65 Introduction Terminal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Hasegawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Mitsuharu Matsuo             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3H039 AA03 AA06 AA12 BB28 CC29                       CC30 CC33

Claims (7)

[Claims] 1. A compression mechanism section for compressing a predetermined fluid using an orbiting scroll, a bearing frame for supporting a drive shaft for driving the compression mechanism section, and a bearing frame for the orbiting scroll. A back pressure chamber formed between the back surface, a communication hole for communicating the back pressure chamber side and the compression mechanism portion side, and lubricating oil for the compression mechanism portion side via the communication hole. An oil supply mechanism for supplying, a back pressure adjusting means for adjusting the pressure of the back pressure chamber using a predetermined adjustment pressure, and for suppressing the supply of the lubricating oil under predetermined conditions. Scroll compressor provided with the oil supply suppression means of. 2. The scroll compressor according to claim 1, wherein suppressing under the predetermined condition is suppressing when the driving of the compression mechanism section is stopped. 3. The oil supply restraining means controls a position of the communication hole blocking member for blocking the communication hole and a position of the communication hole blocking member so as to block the communication hole under the predetermined condition. 3. The scroll compressor according to claim 1, further comprising a communication hole blocking member position changing means for changing the position. 4. The scroll compressor according to claim 3, wherein the communication hole blocking member position changing means has an electromagnetic coil for changing the position of the communication hole blocking member using the generated electromagnetic force. 5. The back pressure adjusting means includes a back pressure adjusting valve for adjusting the pressure of the back pressure chamber by opening and closing the communication hole according to the predetermined adjustment pressure, 3. The suppressing means has an adjusting pressure changing means for changing the predetermined adjusting pressure so that the communication hole is blocked by the back pressure adjusting valve under the predetermined condition. Scroll compressor. 6. The scroll compressor according to claim 5, wherein the adjusted pressure changing unit has an electromagnetic coil for changing the predetermined adjusted pressure by using the generated electromagnetic force. 7. An electric motor having a coil for driving the drive shaft is provided, wherein the electromagnetic coil is connected in series or in parallel with the coil of the electric motor in a closed container for housing the entire apparatus. The scroll compressor according to claim 4 or 6.