JPH0735081A - Relief mechanism of scroll compressor - Google Patents

Abstract

PURPOSE:To prevent lubricating oil in a scroll compressor from being diluted by ensuring that high and low pressures are bypassed even if a great pressure pulse is generated by fluid compression at the flooded start of the scroll compressor. CONSTITUTION:A first space 31 communicating with the high- and low-pressure spaces of a compressor portion as a circuit linking the high- and low-pressure spaces to each other, a second space 33 communicating the low-pressure space of the compressor portion with the first space 31 in the relief mechanism of a scroll compressor which is provided inside the first space 31 and equipped with a first valve system 30 that opens and blocks the high- and low-pressure spaces of the compressor portion, and a second valve system 32 for opening and blocking the low-pressure space of the compressor portion and the second space 33 are provided, the second valve system 32 being located within the second space 33. The first valve system 30 opens and blocks the first 31 and second 33 spaces and shuts off the high- and low-pressure spaces of the compressor portion from each other by the action of dynamic pressure which is generated by shutting off the low-pressure space of the compressor portion from the second space using the second valve system during operation of the scroll compressor.

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 or a refrigerator.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing a conventional scroll compressor disclosed in Japanese Patent Laid-Open No. 3-237286.
In the figure, 1 is a fixed scroll having a spiral body portion,
2 is a discharge hole formed substantially in the center of the fixed scroll 1,
Reference numeral 3 is an orbiting scroll having a scroll portion, 4 is an Oldham ring for preventing the orbiting scroll 3 from rotating and giving an orbiting motion, 5 is a thrust bearing for receiving a thrust load of the orbiting scroll 3, and 6 is a driving force of an electric motor. Is a centrifugal pump hole formed eccentrically to the crankshaft 6, and 8 is an Oldham ring 4 and a thrust bearing 5.
Is a main frame for supporting the sub-frame, 9 is a sub-frame, and 10 is a balance weight. The aforementioned reference numerals 1 to
The component shown at 10 is the compression element of a scroll compressor. Reference numeral 11 represents a stator, and 12 represents a rotor, and these constituent parts are electric motor elements. The fixed scroll 1, the main frame 8 and the sub-frame 9 in the compression element are airtightly joined to the inner wall of the closed container 13 by shrink fitting or the like, and the discharge muffler 14 and the suction pressure chamber, that is, the suction pressure atmosphere portion 15 are divided in the vertical direction. There is. Further, 16 is a discharge pipe for discharging a discharge gas, 17 is a suction pipe for introducing a suction gas, and 18 is a lubricating oil for lubricating a sliding portion such as a compressor bearing.

Next, the operation of the above-mentioned conventional scroll compressor will be described. The power generated by the electric motor element is transmitted to the orbiting scroll 3 by the crankshaft 6, and the Oldham ring 4 performs the orbiting operation to form a pair of orbiting bodies of the orbiting scroll 3 and the fixed scroll 1. The volume of the compression chamber 19 is changed so that the refrigerant gas sucked from the suction pipe 17 toward the inner circumference from the outer peripheral portion of the spiral body is sucked and compressed through the suction passage 20 and is discharged as a high-temperature high-pressure discharge gas. It is discharged from 2 into the discharge muffler 14, and then discharged from the discharge pipe 16 to the outside of the compressor. At that time, the lubricating oil 18 at the bottom of the closed container 13 is given a refueling head by centrifugal force by the eccentric hole 7 of the crankshaft 6 and rises in the eccentric hole 7 to lubricate rocking parts such as bearings, and then the suction pressure. It is discharged into the atmosphere part 15 and returns to the bottom part of the closed container.

Since the conventional scroll compressor is constructed as described above, when the compressor is stopped, especially when the compressor is in a stopped state for a long time and the temperature of the compressor is low, the scroll compressor or the air-conditioning system can be operated. The refrigerant may be liquefied and flow into the compressor in a large amount, and a large amount of saturated liquid in which the lubricating oil in the compressor is dissolved may remain (sleeping state). When the compressor is started in such a state, the space in which the saturated liquid stays is the suction pressure space, so the pressure of the activated child is suddenly lowered from the balanced state and the refrigerant of the saturated liquid is vaporized rapidly. Due to the viscosity of the lubricating oil, a foaming state occurs, and the bubbles formed by the refrigerant and the lubricating oil are sucked into the compression chamber through the suction passage 20, compressed, and discharged to the discharge muffler 14,
It is discharged to the circuit of the refrigeration or air conditioner through the discharge pipe 16. This causes a large amount of lubricating oil to be discharged to the outside of the compressor, reducing the amount of lubricating oil inside the compressor, causing abnormal wear and seizure of the sliding part due to poor supply of lubricating oil to the sliding part of the compressor. Was becoming. Further, when lying down, a large amount of liquid refrigerant may accumulate not only in the compressor but also in the accumulator (not shown) attached to the suction side of the compressor. If the compressor is started in such a state, as described above, the lubricating oil in the compressor is taken out of the compressor and the large amount of liquid refrigerant accumulated in the accumulator when the compressor residual oil becomes small And the lubricating oil in the compressor was diluted, and abnormal wear and seizure occurred on the sliding parts of the compressor due to the decrease in oil concentration.

FIG. 9 is a cross-sectional view of a conventional scroll compressor provided with a high / low pressure bypass valve mechanism for the purpose of preventing lubricating oil from being taken out of the compressor when the bed is started up. In the scroll compressor shown in FIG. 9, the discharge scroll muffler 14 and the suction pressure atmosphere part 15 penetrate through the fixed scroll 1, the main frame 8 and the sub-frame 9 which are hermetically fitted in the hermetically sealed container 13 and pass through the peripheral edges thereof. A communication hole 33 that communicates with and is formed. On the upper surface of the fixed scroll 1 in which the opening of the communication hole 33 on the discharge muffler 14 side is formed, a valve device 34 for opening and closing the opening is provided. The valve device 34 is made of, for example, a bimetal or a shape memory alloy, and opens the communication hole 33 at a low temperature, and when the temperature rises, the communication hole 33.
A valve 35 that closes the opening is fixed to the upper surface of the fixed scroll 1 with a bolt 32.

According to the scroll compressor configured as described above, when the compressor is stopped for a long time and the refrigerant is condensed inside the compressor, the temperature of the compressor is almost equal to the outside atmosphere. At this time, the valve 35 is in a state where the communication hole 33 is opened. When the compressor is activated, the suction pressure atmosphere portion 15 is depressurized by sucking the refrigerant gas into the compressor. However, since the communication hole 33 is opened to the discharge muffler 14, the discharge gas bypasses to the suction side. The depressurization rate (ratio of pressure decrease to elapsed time) decreases. Therefore, the degree of foaming of the mixed liquid of the refrigerant and the lubricating oil can be suppressed, and the amount of the mixed bubbles of the refrigerant and the lubricating oil flowing into the compression chamber through the suction passage 20 can be suppressed. Further, since the lubricating oil flowing into the compression chamber and discharged to the discharge muffler 14 is returned to the suction pressure atmosphere portion 15 through the communication hole 33, the amount of lubricating oil taken out of the compressor can be reduced. If the discharge muffler 14 is provided with a concave portion or the like serving as an oil reservoir and the communication hole 33 is provided in that portion, oil return can be effectively performed. After a lapse of a certain time after the compressor is started, the valve 35 in the high-temperature discharge gas atmosphere is
Deforms so that the temperature rises and the communication hole 33 is closed.
This puts the compressor in a normal operating state, but the communication hole 3
By setting the cross-sectional area of No. 3 and the opening / closing temperature of the valve 35 to the optimum values, the degree and duration of the bubbling state can be controlled and the amount of lubricating oil in the compressor can be maintained at an appropriate value.

[0007]

The scroll compressor provided with the conventional high and low pressure bypass mechanism is constructed as described above, but the bypass valve mechanism using the temperature sensitive valve such as bimetal shape memory alloy is used. However, because the rigidity of these valves is lower than that of general steel such as Swedish steel, when the valve is closed and the collision speed against the fixed scroll base plate is high, the valve cracks at the valve tip and the valve root Parts may be damaged. Therefore, in order to reduce the collision speed, the valve lift amount must be reduced.However, if the valve lift amount is reduced, the valve will close due to a slight difference in pressure between high and low pressure. There is a problem that the valve may be closed before the bubbling of the liquid refrigerant is stopped, and the necessary bypass time and the bypass effect cannot be obtained. Further, in the case of starting with a large amount of liquid refrigerant lying down, the refrigerant may be sucked into the compression chamber in a liquid state, and a large pressure pulse may be generated as discharge pressure due to liquid compression. In this case, the dynamic pressure due to the pressure pulse acts on the back pressure of the valve to close the valve, and the valve closes within a few seconds immediately after startup, and the bypass effect cannot be obtained at all. Further, when the valve is closed by the pressure pulse, the collision speed against the fixed scroll base plate is considerably high, which causes problems such as valve cracking and valve root damage.

The present invention has been made in order to solve the above-mentioned problems, and a large-pressure pulse due to liquid compression is required only for the bypass required time until the foaming of the liquid refrigerant in the compressor and the accumulator at start-up is stopped. Even if occurs, the high and low pressures are reliably bypassed, the sudden pressure drop on the suction pressure atmosphere side at startup is mitigated, and the generation of the mixed liquid of the refrigerant and lubricating oil retained in the compressor is suppressed, By preventing the oil from being taken out of the machine and mitigating the sudden liquid back phenomenon from the accumulator, it is possible to prevent the oil from diluting inside the compressor and ensure the required oil concentration, as well as valve cracking, valve root damage, etc. An object of the present invention is to provide a scroll compressor provided with a highly reliable high and low pressure bypass mechanism that does not occur.

[0009]

A scroll compressor according to the present invention is a combination of a fixed scroll and an orbiting scroll in which a spiral body such as an involute is projected from an end plate surface, and the orbiting scroll is orbited. A compression part for compressing the fluid by reducing the compression chamber formed by the scrolls of both scrolls and the end plate from the outer circumference to the inner circumference of the end plate at any time, a motor part for driving the compression part, and the compression part. A main shaft having an eccentric part for transmitting the driving force of the motor part and a shell containing a frame part supporting the main shaft, and communicating with a high and low pressure space as a circuit connecting the high and low pressure spaces of the compression part. In a relief mechanism of a scroll compressor, which is configured to include a first space and a first valve mechanism that is provided in the first space and opens and closes a high and low pressure space of the compression unit. A second space that communicates the low-pressure space of the compression unit with the first space, and a second valve mechanism that is provided in the second space and that opens and closes the low-pressure space of the compression unit and the second space. And the first space and the second space
And the low pressure space of the compression section is closed by the second valve mechanism when the scroll compressor is in operation, and the high and low pressure space of the compression section is created by the dynamic pressure action. The valve mechanism for shutting off is constituted by the first valve mechanism.

Further, in the scroll compressor according to the present invention, a low pressure space of the compression unit is provided in a second space that communicates the low pressure space of the compression unit with the first space. And a second valve mechanism that opens and closes the second space, and opens and closes the first space and the second space to operate the scroll compressor at a low pressure space of the compression unit and the second space. The first valve mechanism constitutes a valve mechanism for shutting off the high and low pressure space of the compression section by a dynamic pressure action by shutting off the space of the second valve mechanism by the second valve mechanism. The mechanism is provided with a communication means for communicating the first space and the second space.

Also, in the scroll compressor according to the present invention, a low pressure space of the compression unit is provided in a second space that communicates the low pressure space of the compression unit with the first space. And a second valve mechanism that opens and closes the second space, and opens and closes the first space and the second space to operate the scroll compressor at a low pressure space of the compression unit and the second space. The first valve mechanism constitutes a valve mechanism for shutting off the high and low pressure space of the compression section by a dynamic pressure action by shutting off the space of the second valve mechanism by the second valve mechanism. The mechanism is formed by a circular valve, and a small hole that connects the first space and the second space is provided at the center of the circular valve.

Also, in the scroll compressor according to the present invention, a low pressure space of the compression unit is provided in a second space that communicates the low pressure space of the compression unit with the first space. And a second valve mechanism that opens and closes the second space, and opens and closes the first space and the second space to operate the scroll compressor at a low pressure space of the compression unit and the second space. The first valve mechanism constitutes a valve mechanism for shutting off the high and low pressure space of the compression section by a dynamic pressure action by shutting off the space of the second valve mechanism by the second valve mechanism. The mechanism is formed by a circular valve or a reed valve, and the first space and the second space are communicated with a part of a valve seat portion that is in contact with the circular valve or the reed valve and shields the high-low pressure space. The groove is formed.

According to the scroll compressor of the present invention, in the relief mechanism of the scroll compressor according to claim 1, claim 2, claim 3 or claim 4, the valve of the second valve mechanism is compressed. It is made of a material that opens and closes due to the pressure difference between the low-pressure space and the second space.

Further, in the scroll compressor according to the present invention, in the relief mechanism of the scroll compressor according to claim 1, claim 2, claim 3 or claim 4, the second valve mechanism is a temperature sensitive valve. It is composed of.

[0015]

In the scroll compressor according to the present invention, the second space communicating the low pressure space of the compression section and the first space, the low pressure space of the compression section and the second space provided in the second space, A second valve mechanism that opens and closes the second space is provided, and the first space and the second space are opened and closed to operate the scroll compressor, and the low-pressure space of the compression unit and the second space. Since the valve mechanism that shuts off the high and low pressure space of the compression unit by the dynamic pressure action due to the shutoff of and by the second valve mechanism is configured by the first valve mechanism, In the low temperature state immediately after startup, the first valve mechanism does not shield the high and low pressure space by the dynamic pressure generated by the large pressure pulse generated in the compression section. On the contrary, at high temperature such as during normal operation, the second valve mechanism shields the second space and the low pressure space by the high temperature and high pressure gas slightly leaking from the first space to the second space, and First by dynamic pressure due to generated pressure pulse
Is blocked by the valve mechanism.

Further, in the scroll compressor according to the present invention, the high temperature and high pressure gas acts on the second space by the passage that slightly leaks from the first space to the second space during the normal operation, and the first valve mechanism. Keeps shielded.

Further, the scroll compressor according to the present invention uses a material for opening and closing the valve of the second valve mechanism by the pressure difference between the low pressure space of the compression section and the second space, and the large pressure generated in the compression section is used. The first valve mechanism that does not block the high and low pressure spaces by the dynamic pressure of the pulse blocks the second valve mechanism that is caused by the high and low pressure difference during normal operation, so that the first valve mechanism blocks.

Also, in the scroll compressor according to the present invention, the second valve mechanism is a temperature sensitive valve, and the first valve mechanism does not shield the high and low pressure spaces by the dynamic pressure generated by the large pressure pulse generated in the compression section. However, during normal operation, the first valve mechanism is shielded by shielding the second valve mechanism with the high temperature gas.

[0019]

【Example】

Example 1. In FIG. 1A, the basic structure is shown in FIGS.
The same reference numerals denote the same or corresponding portions, and detailed description thereof will be omitted. In the figure, 30 is a first valve mechanism,
It is composed of a valve 30a and a coil spring 30b. 31
Is a first space for accommodating the first valve mechanism 30. 32
Is a second valve mechanism and includes a valve 32a and a valve retainer 32b. Reference numeral 33 is a second space that houses the second valve mechanism 32, 34 is a passage that connects the discharge muffler 14 and the first space 31, and 35 is the first space 31.
Is a passage for guiding the fluid from the to the second space 33. Further, 36 is a passage that communicates the first space 31 and the suction atmosphere portion 15, and 37 is a passage that communicates the second space 33 and the suction atmosphere portion 15. Note that FIG. 1B is a sectional view showing another scroll compressor.
Similar to the scroll compressor of (a), the valve mechanism 30, the first
The first space 31, which houses the valve mechanism 30, the second valve mechanism 32, the second space 33 which houses the second valve mechanism 32, the passage 34 which connects the discharge muffler 14 and the first space 31,
Passage 3 for guiding fluid from the first space 31 to the second space 33
5, a passage 36 that connects the first space 31 and the suction atmosphere portion 15 and a passage 37 that connects the second space 33 and the suction atmosphere portion 15.

Next, the operation will be described. FIG. 2 shows a low temperature state before and after starting. As is clear from the figure, since the passage 34 and the passage 36 communicate with each other through the first space 31, if the liquid refrigerant is filled in the compressor after the start-up in this state, a large amount of liquid compression will occur. The valve 30a does not block passage 34 and 36 in the event of a pressure pulse. This is because a part of the fluid passes through the passage 35 from the minute gap between the valve seat 30c and the valve 30a and the second space 3
3, the flow to the suction atmosphere portion 15, from the passage 34 to the passage 36
This is because the dynamic pressure generated when the fluid flows into the chamber is suppressed. After the start-up, the valve 32a starts to close as time passes, as shown in FIG. This is because when the pressure difference between the second space 33 and the suction atmosphere portion 15 is used,
A high-rigidity material valve may be used as the valve 32a, and when the temperature increase in the second space 33 is to be used, the valve 3
A temperature sensitive valve may be used as 2a. And valve 32
When a is closed, the pressure in the second space 33 rises as shown in FIG. 4, and this time the dynamic pressure generated when the fluid flows from the passage 34 to the passage 36 causes the valve 30a to close, thereby closing the passage 34 and the passage. 36 is shielded, and a normal operating state without so-called relief is achieved. FIG. 5 shows the inside of the second space 33 and the suction atmosphere portion 15.
It is a figure showing how a pressure difference and a temperature difference of change from after starting a compressor. According to the experiment, FIG.
If there is no relief mechanism as shown in (a), a large pressure pulse as shown by a dotted line is generated. On the other hand, when a high-rigidity material valve is used for the valve 32a, the pressure pulse is reduced and the pressure difference becomes ΔP at time T1, and the valve 32a closes. When a temperature sensitive valve is used as the valve 32a, the temperature difference becomes ΔT at time T2 and the valve 3
2a is closed (see FIG. 5 (b)). Time T2 at this time
In general, T1 <T2, and the effect of suppressing vaporization of the liquid refrigerant becomes clearer when the temperature-sensitive valve is used. (See FIG. 5 (c)). However, the high-rigidity material valve is less expensive than the temperature-sensitive valve, and may be selected as needed. In this embodiment, the high-rigidity material valve / temperature-sensitive valve is shown as one reed valve, but the number of valves and valve type are not particularly specified and may be selected as required.

As described above, the second space 33 communicating the low pressure space of the compression section and the first space 31, and the low pressure space of the compression section and the second space 33 provided in the second space 33 are opened and closed. And a second valve mechanism 32 for operating the scroll compressor to open and close the first space 31 and the second space 33, and the low pressure space of the compression section and the second space 33 form the second valve. Mechanism 32
Since the valve mechanism that shuts off the high and low pressure space of the compression section by the dynamic pressure effect due to the shutoff by the first valve mechanism 30 can be relieved (bypassed) only for the required time, the suction atmosphere at startup The sudden pressure drop on the part 15 side is alleviated to suppress the foaming of the mixed liquid of the refrigerant and the lubricating oil staying in the compressor, prevent the oil from being taken out of the compressor, and prevent the oil from coming out from the accumulator (not shown). The oil in the compressor can be prevented from being diluted by mitigating the sudden liquid back of the liquid.

Example 2. In the first embodiment, it was described that the passage 34 and the passage 36 are shielded by the valve 30a to be in the normal operating state. However, the high pressure fluid leaks from the gap between the valve 32a and the valve seat 32c in the closed state, and the first space In some cases, the pressure in 31 and the second space 33 becomes lower than the pressure in the discharge muffler 14, and the blocking of the passage 34 and the passage 36 by the valve 30a may be incomplete. In this embodiment, the valve 30a completely blocks the passage 34 and the passage 36, and will be described with reference to FIGS. FIG. 6 is a sectional view of the scroll compressor according to the present embodiment. Reference numeral 30d is a small hole that is opened substantially in the center of the valve 30a. Further, FIG. 7 is a sectional view of a compression portion of another scroll compressor according to the present embodiment. Reference numeral 30e is a minute groove that connects the passage 34 and the passage 35.

Next, the operation will be described. According to FIG. 6, a small hole 30d is formed in the center of the valve 30a so that the first space 3
The first and second spaces 33 and the passage 34 communicate with each other. By adopting such a configuration, the valve 30a
When the passage 34 and the passage 36 are shielded by means of, the pressure in the first space 31 and the second space 33 becomes equal to the pressure in the discharge muffler 14, and the shielding is maintained stably. In addition, when the passage 30 and the passage 36 are not blocked by the valve 30a as described in the first embodiment, the valve seat 3
0c and the valve 30a pass through the passage 35 to the second space 33 and the suction atmosphere portion 15, and the passage 3
The function of suppressing the dynamic pressure generated when flowing from 4 to the passage 36 can be performed by the small hole 30d. Similarly, as shown in FIG.
The groove 30e may be used instead of 0d so that the first space 31 and the second space 33 communicate with the passage 34.

As described above, the first valve mechanism provided in the first space for opening and closing the high and low pressure space has the minute passage connecting the first space and the second space. Therefore, the dynamic pressure generated in the first space can be suppressed at the time of start-up, and the passage 34 and the passage 36 are reliably shielded in the normal operating state.

[0025]

According to the first aspect of the present invention, a second space communicating the low pressure space of the compression section and the first space, and a low pressure space of the compression section provided in the second space. The second
And a second valve mechanism for opening and closing the space of
And the second space are opened and closed, and when the scroll compressor is in operation, the low pressure space of the compression unit and the second space are shut off by the second valve mechanism. The valve mechanism for shutting off the high and low pressure space of the compression unit is the first
The first valve mechanism shields the high and low pressure spaces by the dynamic pressure generated by the large pressure pulse generated in the compression unit in the normal temperature state such as before starting or in the low temperature state immediately after starting because it is configured by the above valve mechanism. Never. On the other hand, when the temperature is high during normal operation, the second valve mechanism shields the second space and the low pressure space by the high temperature and high pressure gas slightly leaking from the first space to the second space, and The first valve mechanism can block the high and low pressure space of the compression unit by the dynamic pressure generated by the generated pressure pulse.

Further, according to the second invention, a second space communicating the low pressure space of the compression section and the first space, and a low pressure space of the compression section provided in the second space. A second valve mechanism that opens and closes the second space is provided, and the first space and the second space are opened and closed to operate the scroll compressor at a low pressure space of the compression unit and the second space. The first valve mechanism constitutes a valve mechanism that shuts off the high-low pressure space of the compression section by a dynamic pressure action due to the fact that the space is shut off by the second valve mechanism. Since the communication means for connecting the first space and the second space to each other is provided, the high-temperature and high-pressure gas that slightly leaks from the first space to the second space through the communication means during the normal operation is It is possible to act on the space and maintain the state in which the first valve mechanism is shielded.

Further, according to the third invention, the first valve mechanism is constituted by a circular valve, and a small hole for communicating the first space and the second space is provided at the center of the circular valve. Therefore, during normal operation, the high-temperature and high-pressure gas slightly leaking from the first space to the second space through the small holes acts on the second space to maintain the state in which the first valve mechanism is shielded. be able to.

According to a fourth aspect of the present invention, the first valve mechanism is a circular valve or a reed valve, and a valve seat for abutting the circular valve or the reed valve to shield the high and low pressure space. Since a groove that connects the first space and the second space is formed in a part of the portion, a high-temperature high-pressure gas that slightly leaks from the first space to the second space through the groove during normal operation is formed. It is possible to act on the second space and maintain the state in which the first valve mechanism is shielded.

According to the fifth aspect of the invention, the valve of the second valve mechanism is formed of a material that opens and closes due to the pressure difference between the low pressure space of the compression section and the second space. Two
The second valve mechanism can be operated by utilizing the pressure difference between the space and the suction atmosphere portion.

Further, according to the sixth aspect of the invention, since the second valve mechanism is constituted by a temperature sensitive valve, the second valve mechanism can be operated by utilizing the temperature rise in the second space. It can be operated.

[Brief description of drawings]

1A and 1B are cross-sectional views of a compressor of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts of the scroll compressor according to the embodiment of the present invention during relief.

FIG. 3 is a cross-sectional view of a main part of the scroll compressor according to an embodiment of the present invention while the first valve mechanism is being shielded.

FIG. 4 is a cross-sectional view of essential parts of the scroll compressor according to the embodiment of the present invention during normal operation.

5A, 5B, and 5C are explanatory views showing changes in pressure, temperature, and the like of the scroll compressor according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view of essential parts of a scroll compressor according to another embodiment of the present invention during normal operation.

FIG. 7 is a cross-sectional view of essential parts of a scroll compressor according to another embodiment of the present invention during normal operation.

FIG. 8 is a sectional view of a conventional scroll compressor.

FIG. 9 is a cross-sectional view of a conventional scroll compressor.

[Explanation of symbols]

 1 Fixed Scroll 2 Oscillating Scroll 14 Discharge Muffler (High Pressure Space) 15 Suction Pressure Atmosphere 30 First Valve Mechanism 31 First Space 32 Second Valve Mechanism 33 Second Space

Claims (6)

[Claims] 1. A spiral scroll and an end plate of both scrolls are formed by combining a fixed scroll and an orbiting scroll in which a spiral body such as an involute is projected from an end plate surface and rotating the orbiting scroll. A compression section for compressing the fluid by reducing the compression chamber from the outer circumference to the inner circumference at any time, a motor section for driving this compression section, and an eccentric section for transmitting the driving force of the motor section to the compression section. A first space that is composed of a main shaft and a shell that encloses a frame portion that supports the main shaft, and that is provided in the first space and a first space that communicates with the high and low pressure space as a circuit that connects the high and low pressure spaces of the compression unit; In a relief mechanism of a scroll compressor configured to include a first valve mechanism that opens and closes a high-low pressure space of the compression unit, a second mechanism that communicates the low-pressure space of the compression unit with the first space. A second valve mechanism for opening and closing the low pressure space of the compression section and the second space, the space being provided in the second space, and the first space and the second space.
And the low pressure space of the compression section is closed by the second valve mechanism when the scroll compressor is in operation, and the high and low pressure space of the compression section is created by the dynamic pressure action. A relief mechanism for a scroll compressor, characterized in that the valve mechanism for shutting off is constituted by the first valve mechanism. 2. A spiral scroll and an end plate of both scrolls are formed by combining a fixed scroll and an orbiting scroll in which a spiral body such as an involute is projected from an end plate surface and rotating the orbiting scroll. A compression section for compressing the fluid by reducing the compression chamber from the outer circumference to the inner circumference at any time, a motor section for driving this compression section, and an eccentric section for transmitting the driving force of the motor section to the compression section. A first space that is composed of a main shaft and a shell that encloses a frame portion that supports the main shaft, and that is provided in the first space and a first space that communicates with the high and low pressure space as a circuit that connects the high and low pressure spaces of the compression unit; In a relief mechanism of a scroll compressor configured to include a first valve mechanism that opens and closes a high-low pressure space of the compression unit, a second mechanism that communicates the low-pressure space of the compression unit with the first space. A second valve mechanism for opening and closing the low pressure space of the compression section and the second space, the space being provided in the second space, and the first space and the second space.
And the low pressure space of the compression section is closed by the second valve mechanism when the scroll compressor is in operation, and the high and low pressure space of the compression section is created by the dynamic pressure action. A scroll compressor characterized in that the valve mechanism for shutting off the valve is constituted by the first valve mechanism, and the first valve mechanism is provided with a communicating means for communicating the first space and the second space. Relief mechanism. 3. A fixed scroll and an orbiting scroll having a scroll body such as an involute protruding from an end plate surface are combined with each other, and the orbiting scroll is swung to form a scroll body and an end plate of both scrolls. A compression section for compressing the fluid by reducing the compression chamber from the outer circumference to the inner circumference at any time, a motor section for driving this compression section, and an eccentric section for transmitting the driving force of the motor section to the compression section. A first space that is composed of a main shaft and a shell that encloses a frame portion that supports the main shaft, and that is provided in the first space and a first space that communicates with the high and low pressure space as a circuit that connects the high and low pressure spaces of the compression unit; In a relief mechanism of a scroll compressor configured to include a first valve mechanism that opens and closes a high-low pressure space of the compression unit, a second mechanism that communicates the low-pressure space of the compression unit with the first space. A second valve mechanism for opening and closing the low pressure space of the compression section and the second space, the space being provided in the second space, and the first space and the second space.
And the low pressure space of the compression section is closed by the second valve mechanism when the scroll compressor is in operation, and the high and low pressure space of the compression section is created by the dynamic pressure action. The valve mechanism for shutting off is constituted by the first valve mechanism, the first valve mechanism is formed by a circular valve, and the first space and the second space are communicated with each other at the center of the circular valve. A relief mechanism for a scroll compressor, which is provided with small holes. 4. A spiral scroll and an end plate of both scrolls are formed by combining a fixed scroll and an orbiting scroll in which a spiral body such as an involute is projected from an end plate surface and rotating the orbiting scroll. A compression section for compressing the fluid by reducing the compression chamber from the outer circumference to the inner circumference at any time, a motor section for driving this compression section, and an eccentric section for transmitting the driving force of the motor section to the compression section. A first space that is composed of a main shaft and a shell that encloses a frame portion that supports the main shaft, and that is provided in the first space and a first space that communicates with the high and low pressure space as a circuit that connects the high and low pressure spaces of the compression unit; In a relief mechanism of a scroll compressor configured to include a first valve mechanism that opens and closes a high-low pressure space of the compression unit, a second mechanism that communicates the low-pressure space of the compression unit with the first space. A second valve mechanism for opening and closing the low pressure space of the compression section and the second space, the space being provided in the second space, and the first space and the second space.
And the low pressure space of the compression section is closed by the second valve mechanism when the scroll compressor is in operation, and the high and low pressure space of the compression section is created by the dynamic pressure action. A valve mechanism for shutting off the valve is constituted by the first valve mechanism, the first valve mechanism is formed by a circular valve or a reed valve, and the circular valve or the reed valve is brought into contact with the high-low pressure space. 3. A groove that connects the first space and the second space is formed in a part of the valve seat portion that shields.
Relief mechanism for the scroll compressor described. 5. The valve of the second valve mechanism is formed of a material that opens and closes due to the pressure difference between the low pressure space of the compression section and the second space. The relief mechanism for a scroll compressor according to claim 3 or 4. 6. A relief mechanism for a scroll compressor according to claim 1, 2 or 3, wherein the second valve mechanism is a temperature sensitive valve.