JP2013241847A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor capable of preventing damage of a compression mechanism part, when a liquid object such as a liquid refrigerant or refrigerating machine oil has flowed into the compressor in large quantities in a short time.SOLUTION: A scroll compressor is characterized in that at least one release valve device (release hole 15a) is arranged so as to always face to a suction port 5a for sucking a working fluid via a working fluid passage (spiral gas passage 5b) when compressing the working fluid by a compression space 11 by turning a turning scroll 6 to a fixed scroll 5.

Description

  The present invention relates to a scroll compressor.

  In recent years, R32 refrigerant has attracted attention as a refrigerant used in refrigerators, air conditioners, refrigerators and the like. The R32 refrigerant has a global warming potential (GWP) of about 1/3 that of R410a, which is widely used as a refrigerant for room air conditioners, and the ozone depletion coefficient (ODP) is zero. Therefore, according to this R32 refrigerant, it can contribute to the reduction of environmental load.

Conventionally, a refrigerant compressor using an R32 refrigerant is disclosed in Patent Document 1, Patent Document 2, and the like, and a room air conditioner equipped with the compressor is excellent in efficiency without requiring a large design change.
However, the refrigerant compressor of Patent Document 1 has a higher discharge temperature than that using any of R22, R410a, and R407c as a refrigerant. Specifically, the refrigerant compressor of Patent Document 1 has an equivalent compressor efficiency and a discharge temperature that is about 19 ° C. higher than that using R22. For this reason, the refrigerant compressor of Patent Document 1 has a problem that parts and refrigerating machine oil are more likely to deteriorate than those using a refrigerant such as R22 having a lower discharge temperature, and long-term reliability cannot be ensured. In particular, the demagnetizing force of the compressor motor incorporated in the refrigerant compressor tends to decrease as the discharge temperature increases.

On the other hand, the refrigerant compressor of Patent Document 2 suppresses an increase in discharge temperature by lowering the degree of dryness on the compressor suction side. Incidentally, the R32 refrigerant is at a level where the reliability of the compressor can be used when the dryness on the compressor suction side is 0.60 or more.
However, in the case of the refrigerant compressor of Patent Document 2, particularly the scroll compressor, liquid compression occurs in which the liquid refrigerant is compressed, and the compression mechanism may be damaged due to overload at that time.

On the other hand, conventionally, a scroll compressor including a release valve device that connects a compression chamber and a discharge pressure chamber to a base plate above a fixed scroll is known (for example, see Patent Document 3).
In such a scroll compressor with a release valve device, when the pressure in the compression chamber becomes equal to or higher than the discharge pressure during the refrigerant compression process, the pressurized gas or liquid refrigerant is opened by opening the release valve of the release valve device. It is configured to be discharged from the compression chamber to the discharge pressure chamber.
Therefore, according to this scroll compressor with a release valve device, even if the R32 refrigerant is applied, it is conceivable that damage to the compression mechanism can be avoided.

JP 2001-115963 A Japanese Patent No. 039556589 JP 2002-221171 A

  However, in a conventional scroll compressor with a release valve device using R32 refrigerant (see, for example, Patent Document 3), if the dryness on the suction side of the compressor is reduced as described above, liquid substances such as liquid refrigerant and refrigeration oil are used. Flows into the compressor in a short time. A large amount of the liquid material that has flowed in may get stuck at the wrap portion of the orbiting scroll and may stay in the pipe portion upstream from the suction port. Then, the compression mechanism may be damaged by an overload applied to the meshing portion between the orbiting scroll and the fixed scroll when the stuck liquid or the like is about to flow into the compression chamber.

  Then, the subject of this invention is providing the scroll compressor which can prevent damage to a compression mechanism part, when liquid substances, such as a liquid refrigerant and refrigeration oil, flow in large quantities in a compressor in a short time. .

  The scroll compressor of the present invention that solves the above problems includes a sealed container that houses a fixed scroll and a turning scroll, a working fluid suction port formed in the fixed scroll, and a working fluid discharge port formed in the fixed scroll. A spiral working fluid passage formed in the fixed scroll so as to connect, a compression chamber formed in the working fluid passage by meshing the fixed scroll and the orbiting scroll, and the discharge port. A discharge pressure chamber provided in the closed container so as to communicate with the compression chamber, and the fixed scroll, and when the pressure of the working fluid passage rises higher than a set pressure, the working fluid passage and the And a release valve device that opens the circuit so as to communicate with the discharge pressure chamber. When the working fluid is compressed in the chamber, characterized in that at least one of the release valve device is arranged so as to face always through the hydraulic fluid passage to the suction port.

  ADVANTAGE OF THE INVENTION According to this invention, when liquid substances, such as a liquid refrigerant and refrigerating machine oil, flow in large quantities into a compressor for a short time, the scroll compressor which can prevent damage to a compression mechanism part can be provided.

It is a cross-sectional view of the compression mechanism part of the scroll compressor corresponding to the II cross section of FIG. It is a longitudinal cross-sectional view of the scroll compressor which concerns on embodiment of this invention. (A) is a schematic diagram showing a compression chamber formed between the outer periphery of the orbiting scroll wrap and the fixed scroll, and (b) is formed between the inner periphery of the orbiting scroll wrap and the fixed scroll. It is a schematic diagram which shows the compression chamber made. It is a top view of the fixed scroll of the scroll compressor of FIG. It is sectional drawing of the release valve apparatus corresponding to the VV cross section of FIG. 4, (a) is sectional drawing which shows the release valve apparatus of a closed state, (b) is sectional drawing which shows the release valve apparatus of an open state It is. FIG. 5 is a partially enlarged view of a VI part in FIG. 1, illustrating a position of a release valve device arranged closer to the suction port than a moving range of a lap of a turning scroll. It is the elements on larger scale which show the other example of the position of the release valve apparatus arrange | positioned near an inlet. It is the elements on larger scale which show the other example of the position of the release valve apparatus arrange | positioned near an inlet. (A) is a perspective view which shows the other example of the position of the release valve apparatus arrange | positioned near an inlet port, (b) is a top view of (a). It is a longitudinal cross-sectional view which shows the 1st modification of a release valve apparatus. It is a longitudinal cross-sectional view which shows the 2nd modification of a release valve apparatus.

Next, embodiments of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a cross-sectional view of a compression mechanism portion of a scroll compressor corresponding to the II section of FIG. FIG. 2 is a longitudinal sectional view of the scroll compressor according to the embodiment of the present invention.
As shown in FIGS. 1 and 2, the scroll compressor 1 according to this embodiment includes a working fluid (in the present embodiment, an ether-based or ester) in which the orbiting scroll 6 is swung with respect to the fixed scroll 5. When compressing R32 refrigerant including system refrigerating machine oil), at least one release valve device 15 is arranged so as to always face the suction port 5a for the working fluid. Here, after describing the overall configuration of the scroll compressor 1, the arrangement of the release valve device 15 and the release valve device 15 will be described.

(Overall configuration of scroll compressor)
As shown in FIG. 2, the scroll compressor 1 is comprised of a high-pressure chamber type hermetic scroll compressor and is used as part of a refrigeration cycle such as a room air conditioner and used under a wide range of operating conditions. The scroll compressor 1 includes a compression mechanism unit 3 having a revolving scroll 6 and a fixed scroll 5, an electric motor 4 that drives the compression mechanism unit 3, and a cylindrical vertically long sealed container that houses the compression mechanism unit 3 and the electric motor 4. 2 are provided. In addition, the compression mechanism part 3 is arrange | positioned at the upper part in the airtight container 2, and the electric motor 4 is arrange | positioned at the lower part in the airtight container 2. FIG. And the refrigerator oil 13 is stored by the bottom part in the airtight container 2. FIG.

The sealed container 2 is configured by welding a lid chamber 2b and a bottom chamber 2c up and down to a cylindrical case 2a. The lid chamber 2b is provided with a suction pipe 2d. Reference numeral 8 denotes a backflow prevention valve. A discharge pipe 2e is provided on the side surface of the case 2a. The inside of the sealed container 2 is a discharge pressure chamber 2f.
The suction pipe 2d is for guiding the refrigerant gas to the suction side of the compression mechanism section 3 through the sealed container 2 from its upper surface. The discharge pipe 2e is connected to the side surface so as to communicate with the discharge pressure chamber 2f in the sealed container 2.

The compression mechanism unit 3 includes a fixed scroll 5 in which a spiral fixed scroll wrap 5c is erected on a base plate 5d, a revolving scroll 6 in which a spiral orbiting scroll wrap 6a is erected on a base plate 6d, The frame 9 is integrated with the fixed scroll 5 by a fastening member or the like and supports the orbiting scroll 6.
In FIG. 2, reference numeral 11 denotes a working fluid compression chamber, which will be described in detail later, formed between the fixed scroll wrap 5c and the orbiting scroll wrap 6a. Reference numeral 5e is compressed in the compression chamber 11. The discharge port discharges the working fluid into the discharge pressure chamber 2f.

  As shown in FIG. 1, the fixed scroll 5 is provided with a spiral gas passage 5b (a spiral working fluid passage) that communicates with the suction port 5a and the discharge pressure chamber 2f (see FIG. 2). The gas passage 5b is spirally formed by the fixed scroll wrap 5c. The orbiting scroll 6 (see FIG. 2) formed in a substantially disk shape so as to face the fixed scroll 5 is disposed so as to be rotatable. As described above, the orbiting scroll wrap 6a provided on the upper surface of the orbiting scroll 6 is arranged to mesh with the fixed scroll wrap 5c.

A compression chamber 11 is formed between the fixed scroll wrap 5c and the orbiting scroll wrap 6a according to the position of the orbiting scroll wrap 6a that rotates with respect to the fixed scroll wrap 5c.
And the compression chamber 11 in this embodiment is formed in the outer peripheral side and inner peripheral side of the turning scroll wrap 6a.

3A is a schematic diagram showing a compression chamber formed between the outer periphery of the orbiting scroll wrap and the fixed scroll, and FIG. 3B is an inner periphery of the orbiting scroll wrap and the fixed scroll. It is a schematic diagram which shows the compression chamber formed between.
The compression chamber 11 in this embodiment is formed between the outer peripheral side of the orbiting scroll wrap 6a and the fixed scroll 5 as shown in FIG. 3 (a), and as shown in FIG. 3 (b). It is formed between the orbiting scroll wrap 6a and the fixed scroll 5 on the inner peripheral side.
A discharge port 5 e is formed on the center side of the fixed scroll 5, and the suction port 5 a is formed on the outer peripheral side of the fixed scroll 5.

In the present embodiment, the working fluid confining volume in the compression chamber 11 (see FIG. 3A) formed on the outer peripheral side of the orbiting scroll wrap 6a is formed on the inner peripheral side of the orbiting scroll wrap 6a. It is larger than the closed volume of the working fluid in the compression chamber 11 (see FIG. 3B).
According to the scroll compressor 1 (see FIG. 2) according to the present embodiment, the working fluid sucked from the suction port 5a can be efficiently compressed before being discharged to the discharge port 5e.

  Returning again to FIG. 2, the fixed scroll 5 is fixed to the frame 9 by bolts B1, and the outer peripheral side of the frame 9 is fixed to the inner wall surface of the sealed container 2 by welding. The fixed scroll 5 is provided with a release valve device 15 which will be described in detail later. The frame 9 includes a main bearing 9a that rotatably supports the crankshaft 7. An eccentric portion 7 b of the crankshaft 7 is connected to the lower surface side of the orbiting scroll 6.

  An Oldham ring 12 is disposed between the lower surface side of the orbiting scroll 6 and the frame 9, and the Oldham ring 12 is attached to a groove formed on the lower surface side of the orbiting scroll 6 and a groove formed on the frame 9. Has been. In addition, the Oldham ring 12 functions to cause the orbiting scroll 6 to revolve without rotating due to the eccentric rotation of the eccentric portion 7 b of the crankshaft 7.

  The electric motor 4 includes a stator 4a and a rotor 4b. The stator 4a is fastened to the sealed container 2 by press fitting or the like. The rotor 4b is rotatably arranged in the stator 4a. The electric motor 4 is configured to orbit the orbiting scroll 6 via a crankshaft 7 fixed to the rotor 4b.

  The crankshaft 7 includes a main shaft portion 7 a and the eccentric portion 7 b and is supported by a main bearing 9 a and a lower bearing 17 provided on the frame 9. The eccentric part 7 b is formed integrally with the main shaft part 7 a of the crankshaft 7, and is fitted to a turning bearing (not shown) provided on the back surface of the orbiting scroll 6. The crankshaft 7 is driven by the drive of the electric motor 4, and the eccentric portion 7 b is eccentrically rotated with respect to the main shaft portion 7 a of the crankshaft 7 to drive the orbiting scroll 6. In addition, the crankshaft 7 is provided with an oil supply passage 7c for guiding the refrigeration oil 13 to the main bearing 9a, the lower bearing 17 and the slewing bearing (not shown), and sucks the refrigeration oil 13 to the shaft end on the motor 4 side. An oil supply pipe 7d leading to the oil supply passage 7c is attached.

  An intermediate pressure chamber 14 is formed between the back side of the orbiting scroll 6 and the frame 9. The intermediate pressure chamber 14 is an intermediate pressure between the pressure of the suction pipe 2 d and the pressure of the discharge pressure chamber 2 f. The intermediate pressure chamber 14 is formed in the course of supplying the refrigerating machine oil 13 in the sealed container 2 to the sliding portion of the compression mechanism unit 3. Incidentally, the refrigerating machine oil 13 stored at the bottom of the hermetic container 2 is connected to the main bearing 9a via an oil supply passage 7c formed in the center of the crankshaft 7 by the pressure difference between the intermediate pressure chamber 14 and the discharge pressure chamber 2f. Etc.

  In such a scroll compressor 1, the orbiting scroll 6 is swung through the crankshaft 7 by rotating the rotor 4 b of the electric motor 4. Thus, the working fluid sucked from the suction pipe 2d is sent to the spiral gas passage 5b (see FIG. 1) via the backflow prevention valve 8 and the suction port 5a (see FIG. 1). In the spiral gas passage 5b, as shown in FIG. 1, the compression chamber 11 is formed between the fixed scroll wrap 5c and the orbiting scroll wrap 6a.

  As the orbiting scroll 6 revolves with respect to the fixed scroll 5 without rotating, the working fluid is sucked into the suction chamber 10 shown in FIG. 1 from the suction port 5a. On the other hand, the compression chamber 11 shown in FIG. 1 approaches the central discharge port 5e with the revolution movement of the orbiting scroll wrap 6a.

  The compression chamber 11 decreases the volume of the compression chamber 11 as it approaches the central discharge port 5e. That is, the working fluid in the compression chamber 11 is compressed. And the compression chamber 11 which moved to the position which faces the center discharge outlet 5e discharges the compressed working fluid to the discharge pressure chamber 2f (refer FIG. 2) in the airtight container 2 via the discharge outlet 5e. The discharged working fluid is guided downward through a passage provided on the outer periphery of the frame 9 (see FIG. 2), and after cooling the electric motor 4 (see FIG. 2), is discharged from the discharge pipe 2e (see FIG. 2). It is fed into the refrigeration cycle outside the sealed container 2 (see FIG. 2).

On the other hand, the suction chamber 10 of the spiral gas flow path 5b shown in FIG. 1 sucks the working fluid by the revolving motion of the orbiting scroll wrap 6a and then moves the working fluid between the fixed scroll wrap 5c and the orbiting scroll wrap 6a. The compression chamber 11 is formed so as to be confined in the chamber. The working fluid confined in the compression chamber 11 is compressed and discharged to the central discharge port 5e as described above.
In FIG. 1, reference numeral 15 a is a release hole described later of the release valve device 15 (see FIG. 2).

(Release valve device)
Next, the release valve device 15 will be described. 4 is a plan view of a fixed scroll of the scroll compressor of FIG.
As shown in FIG. 4, the release valve device 15 is installed at a plurality of locations of the fixed scroll 5 corresponding to the plurality of compression chambers 11 (see FIG. 1) formed in the compression mechanism section 3 (see FIG. 2). Yes. Such a release valve device 15 is for discharging the working fluid from the compression chamber 11 to the discharge pressure chamber 2f (see FIG. 2) when the pressure in the compression chamber 11 becomes larger than the set pressure. is there.
In FIG. 4, reference numeral 5 e is a discharge port, and reference numeral 16 is a retainer described later.

FIG. 5 to be referred to next is a cross-sectional view of the release valve device corresponding to the VV cross section of FIG. 4, (a) is a cross-sectional view showing the release valve device in a closed state, and (b) is an open state It is sectional drawing which shows this release valve apparatus.
As shown in FIGS. 5A and 5B, the release valve device 15 includes a release valve 15d and a valve pressing body 15h arranged in the release flow path 15i, and a retainer 16 arranged on the upper surface of the fixed scroll 5. And.

  The release channel 15i is formed in the base plate 5d of the fixed scroll 5 so as to communicate the spiral gas passage 5b (see FIG. 1) and the discharge pressure chamber 2f (see FIG. 2). The release flow path 15i includes a release hole 15a and a release valve chamber 15c.

  The release hole 15a opens to the spiral gas passage 5b (see FIG. 1). The volume of the release hole 15a becomes a part of the volume of the compression chamber 11 (see FIG. 1) formed in the spiral gas passage 5b and becomes a dead volume accompanied by re-expansion loss of the gas remaining in the compression stroke. It is desirable to make the volume (inner diameter dimension and length dimension) of the hole 15a as small as possible.

The release valve chamber 15c is formed with a large diameter portion 15j in which a guide member 15f of a valve pressing body 15h, which will be described later, is mainly disposed, a smaller diameter than the large diameter portion 15j, and a larger diameter than the release hole 15a. The lever is formed by a small-diameter portion 15k that the lever release hole 15a faces and communicates.
The large diameter portion 15j and the small diameter portion 15k communicate with each other via a taper portion 15m.

A valve seat 15b is formed on the bottom of the small-diameter portion 15k. The valve seat 15b is a stepped portion that rises in an annular shape around the release hole 15a.
A release valve 15d is disposed in the valve seat 15b so as to close the release hole 15a. The release valve 15d is formed of a disc-shaped spring steel plate or the like.

The valve pressing body 15h includes a guide member 15f and an urging member 15e.
The guide member 15f is a substantially cylindrical shape to which a urging member 15e is attached while extending from the main body portion to the small diameter portion 15k side of the release valve chamber 15c and a main body portion disposed in the large diameter portion 15j of the release valve chamber 15c. It is mainly composed of the mounting part.
The outer diameter of the main body portion of the guide member 15f is set so as to have a clearance C1 so as to be accommodated in the large diameter portion 15j of the release valve chamber 15c.

Further, the length of the main body in the vertical direction is set to be slightly shorter than the depth of the large diameter portion 15j. That is, as will be described later, a clearance C2 is formed between the main body portion arranged in the large-diameter portion 15j so as to contact the retainer 16 with the urging member 15e and the taper portion 15m.
Such a guide member 15f has a plurality of escape holes 15g as flow paths for the working fluid.

  The urging member 15e in the present embodiment is formed of a coil spring, and at both ends thereof, a tightly wound portion where adjacent windings are in close contact with each other is formed. And the attachment part of the guide member 15f is inserted by one close winding part. The tip of the other tightly wound portion is in contact with the upper surface of the release valve 15d disposed on the valve seat 15b. In addition, although the release valve 15d in this embodiment is configured not to be connected to the tip of the other tightly wound portion, the tip of the tightly wound portion and the release valve 15d can be connected.

  According to the urging member 15e formed of such a coil spring, the attachment portion of the guide member 15f can be inserted and fitted at both ends of the tightly wound portion, so that the assembly is excellent. Further, since the attachment portion is inserted into the tightly wound portion where the winding interval is dense, the attachment stability of the urging member 15e with respect to the guide member 15f is excellent.

  As shown in FIG. 4, the retainer 16 in the present embodiment is a plate that is attached to the upper surface of the base plate 5 d of the fixed scroll 5 with a bolt B <b> 2. In the retainer 16, an opening 16a for allowing the relief hole 15g of the release valve device 15 to face the discharge pressure chamber 2f (see FIG. 2) and a discharge port 5e of the fixed scroll 5 face the discharge pressure chamber 2f (see FIG. 2). An opening 16b is formed.

As shown in FIG. 5A, the edge of the opening 16a of the retainer 16 is in contact with the upper surface of the valve pressing body 15h in the release valve chamber 15c urged upward by the urging member 15e. That is, the retainer 16 restricts the valve pressing body 15h from moving upward in the release valve chamber 15c. Thus, the valve pressing body 15h is held at a predetermined position in the release valve chamber 15c, and the urging member 15e attached to the valve pressing body 15h has a predetermined pressing force for pressing the release valve 15d against the valve seat 15b. Set to be within range.
Such a retainer 16 can be manufactured by, for example, press forming of a steel plate.

  In the release valve device 15, during normal operation of a refrigeration cycle (for example, a room air conditioner) in which the scroll compressor 1 according to this embodiment is incorporated, the release valve 15d has a release hole 15a as shown in FIG. It arrange | positions on the valve seat 15b so that it may block | close, and the urging member 15e of the valve pressing body 15h presses the release valve 15d toward the valve seat 15b with a predetermined urging force (pressing force). In other words, during normal operation, the working fluid compressed in the compression chamber 11 shown in FIG. 1 does not go through the release hole 15a closed by the release valve 15d (see FIG. 5A), but the fixed scroll 5 (FIG. 2). 2) (see FIG. 2) through a discharge port 5e (see FIG. 2) formed at the center of the discharge pressure chamber 2f.

On the other hand, the pressure in the compression chamber 11 (see FIG. 1) is equal to or higher than the discharge pressure. More specifically, the pressure in the compression chamber 11 is the set pressure (discharge pressure + weight of the release valve 15d + elastic pressing force of the biasing member 15e. ), The release valve 15d that has blocked the release hole 15a is lifted upward against the urging force (pressing force) of the urging member 15e as shown in FIG. 5B. It is done. As a result, the working fluid in the compression chamber 11 (see FIG. 1) passes through the release hole 15a, the release valve chamber 15c, and the opening 16a as shown by the white arrow in FIG. It is discharged into the chamber 2f (see FIG. 2).
When the working fluid is discharged into the discharge pressure chamber 2f and the pressure in the compression chamber 11 (see FIG. 1) becomes less than the set pressure, the biasing member 15e is as shown in FIG. 5 (a). In addition, by restoring, the release valve 15d closes the release hole 15a again.

(Arrangement of release valve device)
Next, the position where the release valve device 15 is arranged on the fixed scroll 5 in this embodiment will be described.
As shown in FIG. 1, a plurality of release valve devices 15 (release holes 15a) are arranged along a spiral gas passage 5b in which the compression chamber 11 is formed. More specifically, the spiral gas passage 5b discharges the discharge port 5e formed at the center of the fixed scroll 5 and the suction port 5a formed radially outside the fixed scroll 5 from the discharge port 5e. The release valve device 15 (release hole 15a) extends in a spiral shape around the outlet 5e, and the extending direction of the spiral gas passage 5b extending between the suction port 5a and the discharge port 5e. Are arranged along the line.

  As described above, in the release valve device 15 (release hole 15a), at least one release valve device 15 (release hole 15a) always faces the suction port 5a (see FIG. 1) via the spiral gas passage 5b. Are arranged as follows. In the present embodiment, at least one of the plurality of release valve devices 15 (release holes 15a) is disposed near the suction port 5a of the spiral gas passage 5b.

FIG. 6 is a partially enlarged view of the VI part in FIG. 1 and is a view for explaining the position of the release valve device formed closer to the suction port than the moving range of the orbiting scroll lap.
As shown in FIG. 6, the release valve device 15 (release hole 15a) is disposed closer to the suction port 5a than the moving range L of the orbiting scroll wrap 6a when the orbiting scroll 6 revolves and is fixed. The scroll 5 is disposed near the extension 5f.
Here, when the release valve device 15 (release hole 15a) is “disposed closer to the suction port 5a than the movement range L”, the release valve device 15 (release hole 15a) is released regardless of the position of the orbiting scroll wrap 6a moving within the movement range L. This means that at least a part of the opening of the hole 15a always communicates with the suction port 5a via the spiral gas passage 5b. In other words, as shown in FIG. 6, a part of the opening of the release hole 15 a may overlap the movement range L.
Further, by disposing the release valve device 15 (release hole 15a) closer to the inner line 5f of the fixed scroll 5, there is an advantage that the area of the retainer 16 can be reduced.

  Of the plurality of release valve devices 15 (see FIG. 1), the center of the release valve device 15 (see FIG. 6) formed closest to the suction port 5a (the center of the release hole 15a in plan view) is the center. The swivel scroll 6 is positioned closer to the suction port 5a than the moving range L drawn by the end on the suction port 5a side when the orbiting scroll 6 is turned.

Next, the effect of the scroll compressor 1 according to the present embodiment will be described.
In the scroll compressor 1 as described above, the release valve 15d causes the release hole 15a during normal operation in which the pressure in the compression chamber 11 is equal to or lower than the set pressure in the process in which the working fluid (R32 refrigerant including refrigeration oil) is compressed. Is closed (see FIG. 5A). Therefore, the working fluid is not discharged into the discharge pressure chamber 2f via the release valve device 15 during normal operation.

  On the other hand, if the pressure in the compression chamber 11 exceeds the set pressure in the process of compressing the working fluid (refrigerant gas or liquid refrigerant including refrigerating machine oil) depending on the operation status of the air conditioner or the like, the compression chamber 11 becomes higher than the pressure in the discharge pressure chamber 2f, and the release valve 15d is separated from the valve seat 15b by the pressure difference, and the release hole 15a is opened (see FIG. 5B). The working fluid in the compression chamber 11 that has passed through the release hole 15a due to the opening of the release hole 15a flows in the direction indicated by the white arrow in FIG. 5B and reaches the discharge pressure chamber 2f. Such a release valve device 15 can prevent over-compression loss and damage to the fixed scroll wrap 5c and the orbiting scroll wrap 6a.

  Moreover, in the scroll compressor 1 (refer FIG. 2) which concerns on this embodiment, R32 refrigerant | coolant is used for the purpose of reduction of an environmental load. And in this scroll compressor 1, compared with the conventional scroll compressor using R32 refrigerant | coolant, in order to ensure the long-term reliability, the dryness by the suction side is set low so that the temperature of a discharge side may be reduced. . Thus, when a large amount of liquid refrigerant or refrigerating machine oil flows into the scroll compressor 1 from the suction pipe 2d (see FIG. 2) in a short time, the conventional scroll compressor (see, for example, Patent Document 3) Depending on the hydraulic pressure, the set pressure may be exceeded in the suction chamber before the compression chamber is molded. On the other hand, according to the scroll compressor 1 according to the present embodiment, as shown in FIG. 6, liquid refrigerant and refrigerating machine oil are discharged by the release valve device 15 (release hole 15a) provided near the suction port 15a. Since it can discharge to the pressure chamber 2f, the compression mechanism part 3 can be prevented from being damaged by an overload applied to the fixed scroll wrap 5c and the orbiting scroll wrap 6a.

  Further, according to the scroll compressor 1 according to the present embodiment, since the liquid refrigerant and the refrigerating machine oil can be discharged to the discharge pressure chamber 2f by the release valve device 15 (release hole 15a), the circulation of the liquid refrigerant and the refrigerating machine oil is performed. It is possible to improve the reliability of the scroll compressor 1 by preventing the pipes and valves from being damaged.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can implement with a various form.
Next, FIG. 7, FIG. 8, and FIG. 9 (a) and (b) referred to are figures which show the other example of the position of the release valve apparatus arrange | positioned near an inlet. FIG. 10 is a longitudinal sectional view showing a first modification of the release valve device. FIG. 11 is a longitudinal sectional view showing a second modification of the release valve device.

In the above embodiment, the release valve device 15 (release hole 15a) disposed near the suction port 5a is disposed near the extension 5f of the fixed scroll wrap 5c. In the present invention, as shown in FIG. It can also be arranged near the outer line 5g of the fixed scroll wrap 5c.
According to such a release valve device 15 (release hole 15a), the distance from the suction port 5a is increased, and the deformation of the fixed scroll 5 at the time of processing such as formation of the release flow path 15i (see FIG. 5A) is performed. Can be prevented. In FIG. 7, reference numeral 5 f is an extension of the fixed scroll 5, and reference numeral L is a moving range drawn by the end portion of the orbiting scroll 6 when it is orbiting.

Further, as shown in FIG. 8, the release valve device 15 (release hole 15a) can be disposed at the center in the width direction of the spiral gas passage 5b. In FIG. 8, reference numeral 5 a denotes an inlet, reference numeral 5 g denotes an outer line of the fixed scroll 5, and reference numeral L denotes a moving range drawn by an end portion of the orbiting scroll 6 when turning.
According to the release valve device 15 (release hole 15a), since the release hole 15a is arranged at the center in the width direction of the spiral gas passage 5b, liquid refrigerant or the like easily flows into the release hole 15a, and the release valve device 15 ( Liquid refrigerant or the like can be discharged efficiently through the release hole 15a).

In the above embodiment, at least one release valve device 15 is disposed closer to the suction port 5a. However, in the present invention, at least one release valve device 15 is connected to the suction port 5a via the spiral gas flow path 5b. It only has to be arranged so that it always faces.
Therefore, as shown in FIGS. 9 (a) and 9 (b), the compression chambers 11 (FIG. 3 (a)) are provided on the inner peripheral side and the outer peripheral side of the orbiting scroll wrap 6a at the orbiting scroll 6 portion near the suction port 5a. And (b)), the release valve device 15 (release hole 15a) is provided on the inner peripheral side and the outer peripheral side of the orbiting scroll wrap 6a so that at least one side always communicates with the suction port 5a. It can also be set as the structure which each arrange | positioned.
In this case, it is desirable to provide a digging 5h around the suction port 5a. Such digging 5h can reduce the flow path loss when refrigerant or the like flows through the release valve device 15 (release hole 15a).
In FIGS. 9A and 9B, reference numeral 5 denotes a fixed scroll.

Moreover, in the said embodiment, although the retainer 16 is attached so that the upper surface of the baseplate 5d of the fixed scroll 5 may be contacted, as shown in FIG. It can also be set as the structure arrange | positioned with a clearance gap on the upper surface of the board 5d.
In FIG. 10, reference numeral 15a is a release hole, reference numeral 15c is a release valve chamber, reference numeral 15d is a release valve, reference numeral 15e is an urging member, and reference numeral 15f is a guide member. Reference numeral 15g is a relief hole, and reference numeral 15i is a release flow path. According to such a retainer 16, it is possible to ensure a large movement stroke when the release valve 15d is opened and closed.

  Moreover, in the said embodiment, although it was set as the structure which arrange | positions the release valve 15d (refer FIG. 5 (a)) in the release flow path 15i (refer FIG. 5 (a)), as shown in FIG. In addition, a spring-plate-like release valve 15d is provided on the upper surface of the base plate 5d of the fixed scroll 5 so as to close the upper opening of the release passage 15i, and one side of the release valve 15d is connected to the opening of the release passage 15i. The release valve device 15 can be fixed around the periphery. And in this release valve apparatus 15, the retainer 16 of the shape which curved over the upper side opening of the release flow path 15i can be arrange | positioned. Such a retainer 16 can limit the degree of warping of the release valve 15d when opening the release passage 15i so that the release valve 15d warps.

DESCRIPTION OF SYMBOLS 1 Scroll compressor 2 Airtight container 2f Discharge pressure chamber 3 Compression mechanism part 4 Electric motor 5 Fixed scroll 5a Suction port 5b Spiral gas passage (spiral working fluid passage)
5c Fixed scroll wrap 5e Discharge port 6 Orbiting scroll 6a Orbiting scroll wrap 10 Suction chamber 11 Compression chamber 15 Release valve device 15a Release hole 15b Valve seat 15c Release valve chamber 15d Release valve 15e Energizing member 15f Guide member 15g Escape hole 15h Valve press Body 15i Release channel 16 Retainer

Claims (6)

A sealed container for storing the fixed scroll and the orbiting scroll;
A spiral working fluid passage formed in the fixed scroll so as to connect a working fluid suction port formed in the fixed scroll and a working fluid discharge port formed in the fixed scroll;
A compression chamber formed in the working fluid passage by meshing the fixed scroll and the orbiting scroll;
A discharge pressure chamber provided in the sealed container so as to communicate with the compression chamber through the discharge port;
A release valve device that is disposed on the fixed scroll and opens to communicate the working fluid passage and the discharge pressure chamber when the pressure of the working fluid passage rises above a set pressure;
With
When the orbiting scroll revolves with respect to the fixed scroll and the working fluid is compressed in the compression chamber, at least one release valve device always faces the suction port via the working fluid passage. The scroll compressor characterized by being arrange | positioned. The scroll compressor according to claim 1, wherein
The scroll compressor characterized in that the release valve device is disposed closer to the suction port of the working fluid passage than a moving range of the swirling wrap of the orbiting scroll turning in the working fluid passage. . The scroll compressor according to claim 1, wherein
The compression chamber is formed by meshing a spiral wrap of the fixed scroll and a spiral wrap of the orbiting scroll,
The closed volume of the compression chamber formed between the outer peripheral side of the wrap of the orbiting scroll and the wrap of the fixed scroll is the same as that of the compression chamber formed on the inner peripheral side of the wrap of the orbiting scroll. A scroll compressor characterized by being larger than a confined volume. The scroll compressor according to claim 1, wherein
The release valve device includes a release passage that communicates the compression chamber and the discharge pressure chamber, a release valve that opens and closes the release passage, and an elastic pressing force on the release valve that is disposed above the release valve. A scroll compressor comprising: a valve pressing body to be applied; and a retainer for limiting a moving range of the valve pressing body. The scroll compressor according to claim 1, wherein
The release valve device includes: a release channel that communicates the compression chamber and the discharge pressure chamber; a spring plate-like release valve that opens and closes the release channel and is provided on a top surface of the fixed scroll; And a retainer for limiting a moving range of the release valve. The scroll compressor according to claim 1, wherein
The scroll compressor according to claim 1, wherein the release valve device is arranged at a center in a width direction of the working fluid passage.

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