JP2005264827A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor enabling the secure opening of a discharge valve at a specified timing by a simple structure and also preventing the occurrence of noise from a valve element. <P>SOLUTION: This scroll compressor comprises the discharge valve 62 discharging a compressed refrigerant from a compression chamber 38 to a discharge chamber 60. The discharge valve 62 comprises a communication passage 66 installed at the radial center part of a fixed scroll 32 and joining the compression chamber 38 to the discharge chamber 60, a valve port 67 formed in the communication passage 66, a discharge valve body 84 rotatably disposed in the communication passage 66 and opening/closing the valve port 67 according to a rotating angle, and a connection part 92 connecting between the discharge valve body 84 and a movable scroll 30 and rotating the discharge valve body 84 in association with the swing of the movable scroll 30 to open the valve port 67 at a timing in correspondence with the end period of a compression stroke. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll compressor.

  The scroll compressor is used, for example, in a refrigeration circuit of a vehicle air conditioner, and is used for compressing a refrigerant as a working gas. The scroll compressor includes a fixed scroll and a movable scroll in a housing, and the fixed and movable scrolls arranged to mesh with each other cooperate to form a compression chamber between the scrolls. The movable scroll is swung with respect to the fixed scroll, and the refrigerant in the refrigeration circuit is sucked into the compression chamber through the suction port of the compressor along with the swirling motion, and is compressed in the compression chamber. Thereafter, the compressed refrigerant is discharged from the compression chamber to the discharge chamber of the compressor, and is discharged from the discharge chamber toward the condenser of the refrigeration circuit through the discharge port.

This type of scroll compressor generally includes a discharge valve as a check valve that allows discharge of compressed working gas from the compression chamber, and this discharge valve corresponds to the end of the compression stroke of the refrigerant in the compression chamber. The valve opens at the timing. (Patent Document 1). More specifically, the discharge valve includes a discharge hole formed through the center of the end plate of the fixed scroll so as to communicate between the compression chamber and the discharge chamber in the compressor, and an end plate outer surface on the discharge chamber side. And a reed valve body attached to the. The discharge valve is opened when the pressure of the refrigerant in the compression chamber overcomes the cutoff pressure, and the reed valve body is elastically deformed by being pressed and urged by the pressure of the refrigerant.
JP 2000-257572 A

  In the scroll compressor described above, the timing of opening the discharge valve depends on the followability of the elastic deformation of the reed valve body with respect to the pressure of the working gas (refrigerant). May vary slightly depending on the flow rate. For this reason, the valve opening timing may deviate from the timing at which the valve should be opened. Such a shift in timing causes over-compression and re-compression of the working gas in the scroll unit, leading to an increase in the load on the compressor and a reduction in compression efficiency, and also to a decrease in the refrigeration capacity of the refrigeration circuit.

In addition, the reed valve body also has a problem that a large noise is generated when the flow rate of the refrigerant increases and the number of valve opening increases.
The present invention has been made based on the above-described circumstances, and the object of the present invention is to provide a scroll type fluid machine in which the discharge valve is reliably opened at a predetermined timing and noise generation from the valve body is prevented. Is to provide.

  In order to achieve the above-mentioned object, a discharge valve applied to the scroll compressor of the present invention is provided in the radial center portion of the fixed scroll, and a communication path connecting the compression chamber and the discharge chamber, and a communication path Corresponding to the vicinity of the end of the compression stroke by connecting the formed valve port, the discharge valve body that is rotatably arranged in the communication path, and opening and closing the valve port according to the rotation angle, and the discharge valve body and the movable scroll And a connecting portion for rotating the discharge valve body in conjunction with the turning of the movable scroll so as to open the valve opening at the same timing.

In the scroll compressor according to the first aspect, during the orbiting movement of the movable scroll, the discharge valve body is rotated through the connecting portion, and the valve opening of the communication passage is opened and closed according to the rotation angle of the discharge valve body. For this reason, the valve opening is reliably opened at a timing corresponding to the vicinity of the end of the compression stroke, regardless of the flow rate of the working gas.
The invention of claim 2 is characterized in that the communication path is provided through the end plate of the fixed scroll. According to this configuration, the valve port is formed on the end plate of the fixed scroll, and the discharge valve body is also arranged on the end plate of the fixed scroll.

The invention of claim 3 is characterized in that the communication path includes a through hole provided through the end plate and the spiral wrap of the fixed scroll. According to this configuration, the valve port may be formed on either the end plate or the spiral wrap of the fixed scroll, and the discharge valve body is disposed over one or both of the end plate of the fixed scroll and the spiral wrap. Can do.
The invention of claim 4 is characterized in that the communication passage has a cylindrical valve chamber, and the discharge valve body is disposed in the valve chamber so as to be rotatable around the axis of the valve chamber. According to this structure, the space | interval of the outer peripheral surface of a discharge valve body and the internal peripheral surface of a valve chamber can be made small, and the dead volume in a scroll unit can be made small.

The invention according to claim 5 is characterized in that the discharge valve body has an outer peripheral surface in sliding contact with the inner peripheral surface of the valve chamber. In this case, the discharge valve body can be supported by the inner peripheral surface of the valve chamber and rotate.
In the invention of claim 6, the valve chamber extends along the axis of the fixed scroll and opens toward the movable scroll, and the connecting portion projects from the discharge valve body toward the movable scroll along the axis of the valve chamber. According to this configuration, the discharge valve body can be rotated via the pin.

The invention of claim 7 is characterized in that the pin is positioned away from the axis of the valve chamber by a distance equal to the turning radius of the movable scroll. According to this configuration, since the rotation axis of the discharge valve body and the axis of the valve chamber are completely coincident with each other, the outer peripheral surface of the discharge chamber is uniformly slidably contacted with the inner peripheral surface of the valve chamber over the entire surface. The valve body can rotate smoothly.
The invention according to claim 8 is characterized in that the valve port is formed in the peripheral wall of the valve chamber, and according to this configuration, the valve port is formed by the outer peripheral surface of the discharge valve slidably contacted with the inner peripheral surface of the valve chamber. Can be occluded.

  The invention of claim 9 is characterized in that a partition wall is provided between the valve chamber and the discharge chamber, and a valve port is formed in the partition wall. According to this configuration, the end face of the discharge valve body is pressed and urged against the partition wall by the pressure of the working gas in the compression chamber.

  According to the scroll compressor of claims 1 to 9, the discharge valve body is rotated through the connecting portion during the turning motion of the movable scroll, and the valve port can be reliably opened at a timing corresponding to the vicinity of the end of the compression stroke. Therefore, over-compression and re-compression of the working gas in the compression chamber can be prevented, and the load on the compressor can be reduced and the compression efficiency can be improved. Further, since the discharge valve body is not elastically deformed so as to open and close the valve port, no noise is generated even when the refrigerant flow rate increases, and these scroll compressors have excellent quietness.

According to the scroll compressor of claim 2 and claim 3, since the outer diameter shape of the scroll unit does not change, a common housing with the conventional scroll compressor can be used.
According to the scroll compressor of claim 4, the discharge valve can be formed compactly, the recompression of the refrigerant can be reduced by reducing the dead volume, and the compression efficiency can be further improved. According to the scroll compressor 5, the discharge valve body can be rotatably arranged with a simple configuration.

According to the scroll compressor of the sixth aspect, the discharge valve can be formed with a simple configuration. Further, according to the scroll compressor of the seventh aspect, the operation of the discharge valve is performed by the smooth rotation of the discharge valve body. It can be stabilized.
According to the scroll compressor of claim 8, the discharge valve can be formed with a simple configuration,
Furthermore, according to the scroll compressor of the ninth aspect, the valve opening can be reliably closed when the valve is closed by utilizing the working gas pressure in the compression chamber.

FIG. 1 shows a scroll compressor according to a first embodiment. This compressor is incorporated in a refrigeration circuit of a vehicle air conditioner, for example, and is used to compress refrigerant (working fluid) in the refrigeration circuit. Here, the refrigerant includes refrigerating machine oil as lubricating oil, and this refrigerating machine oil is supplied to bearings and various sliding surfaces in the compressor together with the refrigerant to lubricate them.
The compressor includes a housing 2, which includes a drive casing 4 and a compression casing 6. The casings 4 and 6 are connected to each other by a plurality of connecting bolts 8.

  A drive shaft 10 is disposed in the drive casing 4, and the drive shaft 10 has a large-diameter end portion 12 on the compression casing 6 side, and a small-diameter shaft portion 14 extends from the large-diameter end portion 12. The large diameter end portion 12 is rotatably supported by the drive casing 4 via a needle bearing 16, and the small diameter shaft portion 14 is rotatably supported by the drive casing 4 via a ball bearing 18. Further, a lip seal 20 is attached to the small diameter shaft portion 14 between the ball bearing 18 and the large diameter end portion 12, and the lip seal 20 is slidably contacted with the small diameter shaft portion 14 so that the inside of the drive casing 4 is airtight. It is divided into.

The small-diameter shaft portion 14 of the drive shaft 10 protrudes from the drive casing 4, and a drive pulley 24 incorporating an electromagnetic clutch 22 is attached to the protruding end. The drive pulley 24 rotates to the drive casing 4 via a bearing 26. It is supported freely.
The drive pulley 24 is rotated by receiving power from the engine of the vehicle, and the rotation of the drive pulley 24 can be transmitted to the drive shaft 10 via the electromagnetic clutch 22. Therefore, if the electromagnetic clutch 22 is turned on during driving of the engine, the drive shaft 10 is rotated together with the drive pulley 24.

On the other hand, a scroll unit 28 is accommodated in the compression casing 6, and the scroll unit 28 includes a movable scroll 30 and a fixed scroll 32. Both the movable and fixed scrolls 30 and 32 are made of an aluminum alloy, and are formed of an end plate (substrate) 34 and a spiral wall (spiral wrap) 36 formed integrally with the end plate 34.
As is apparent from FIG. 1, the movable and fixed scrolls 30 and 32 are arranged so that the end plates 34 face each other and the spiral walls 36 are engaged with each other, whereby the compression chamber 38 is interposed between the spiral walls 36. Is formed. The volume of the compression chamber 38 is increased or decreased as the movable scroll 30 rotates with respect to the fixed scroll 32, whereby the refrigerant suction process and the refrigerant compression / discharge process into the compression chamber 38 are performed. become.

  In order to impart the orbiting motion to the movable scroll 30 described above, the end plate 34 of the movable scroll 30 has a boss 40 protruding into the drive casing 4, and this boss 40 rotates to the eccentric bush 44 via the needle bearing 42. It is supported freely. The eccentric bush 44 is supported by a crank pin 46, and the crank pin 46 protrudes in an eccentric state from the large-diameter end portion 12 of the drive shaft 10. Accordingly, when the drive shaft 10 is rotated, the movable scroll 30 performs a turning motion via the crank pin 46 and the eccentric bush 44.

  A counterweight 48 for the movable scroll 30 is attached to the eccentric bush 44, and a rotation stopper 50 for the movable scroll 30 is provided between the drive casing 4 and the movable scroll 30. More specifically, the rotation stopper 50 is supported by the large-diameter end of the drive casing 22 and the substrate 54b, respectively, and a pair of ring plates 52 having annular races at equal intervals in the circumferential direction thereof, and these ring plates 52. The plurality of balls 54 sandwiched between the annular races prevents rotation of the movable scroll 30 around the axis of the needle bearing 42.

On the other hand, the fixed scroll 32 is fixed in the compression casing 6, and a discharge chamber 60 is formed between the end plate 34 of the fixed scroll 32 and the inner wall of the compression casing 6 via an O-ring 56. The discharge chamber 60 can communicate with the compression chamber 38 via a discharge valve 62 (described later) provided at the radial center of the scroll unit 28.
A suction chamber 64 is formed between the outer peripheral wall of the compression casing 6 and the scroll unit 28. Although not shown in FIG. 1, the suction chamber 64 and the discharge chamber are provided on the outer peripheral wall of the compression casing 6. A suction port and a discharge port communicating with each of 60 are formed. The suction port is connected to the evaporator of the refrigeration circuit via a refrigerant pipe, and the discharge port is connected to the condenser of the refrigeration circuit.

  According to the scroll compressor described above, the movable scroll 30 makes a turning motion as the drive shaft 10 rotates, and at this time, the rotation of the movable scroll 30 is blocked by the rotation stopper 50 described above. As described above, the orbiting movement of the movable scroll 30 periodically moves the compression chamber 38 in the direction of contacting and separating from the discharge valve 62, and the volume of the compression chamber 38 is increased or decreased accordingly.

As a result, the refrigerant is sucked into the compression chamber 38 from the suction chamber 64, and the sucked refrigerant is compressed in a process in which the compression chamber 38 moves toward the discharge valve 62 and its volume decreases. . When the compression chamber 38 reaches the discharge valve 62, the discharge valve 62 is opened near the end of the compression stroke, and the compressed refrigerant is discharged from the compression chamber 38 into the discharge chamber 60 through the discharge valve 62.
A part of the refrigerant in the suction chamber 64 is also introduced into the drive casing 4, and the refrigeration oil in the refrigerant is used for lubrication between the bearings and the sliding surfaces in the drive casing 4.

Hereinafter, the discharge valve 62 applied to the scroll compressor described above will be described.
The discharge valve 62 has a communication passage 66 connecting the compression chamber 38 and the discharge chamber 60 and a valve port 67 formed as a part of the communication passage 66. More specifically, as shown in FIG. 3A, the spiral wall 36 of the fixed scroll 32 has an increased thickness at its radially inner end 68. A through hole 70 is formed in the fixed scroll 32 through the radially inner end 68 and the end plate 34, and the through hole 70 extends in the axial direction of the fixed scroll 32, and the outer surface 72 of the end plate 34 and the spiral. It has both ends opened at the side end face 74 of the wall 36. The inner peripheral surface of the through hole 70 is stepped, and the through hole 70 includes a large diameter portion 76 and a small diameter portion 78 arranged coaxially. The large diameter portion 76 is positioned on the end plate 34 side of the movable scroll 30, while the small diameter portion 78 is positioned on the discharge chamber 60 side, and an annular step surface 80 is formed between the small diameter portion 78 and the large diameter portion 76. ing.

A groove 82 is formed on the end surface 74 of the radially inner end portion 68, and the groove 82 opens on the outer peripheral surface of the radially inner end portion 68 and the inner peripheral surface of the large diameter portion 76. The communication passage 66 of the discharge valve 62 is formed by the through hole 70 and the groove 82, and the valve port 67 is formed by the inner end of the groove 82 that opens at the inner peripheral surface of the large diameter portion 76.
The discharge valve 62 includes a discharge valve body 84 that is rotatably disposed in the communication passage 66. The discharge valve body 84 opens and closes the valve port 67 according to the rotation angle. More specifically, as shown in FIGS. 4A to 4C, the discharge valve body 84 has a cylindrical shape having an outer diameter substantially the same as the inner diameter of the large diameter portion 76, and is coaxial with the large diameter portion 76. Contained. The outer peripheral surface of the discharge valve body 84 is in sliding contact with the inner peripheral surface of the large-diameter portion 76, while both end surfaces of the discharge valve body 84 are in sliding contact with the step surface 80 and the end plate 34 of the movable scroll 30. The discharge valve body 84 is rotatable around the axis of the large diameter portion 76 serving as a valve chamber. The discharge valve body 84 is formed with an axial hole 86 penetrating through its radial center, and an arcuate cutout 88 is formed at the end of the movable scroll 30. The notch 88 has a radially inner end and an outer end that open on the inner peripheral surface of the axial hole 86 and the outer peripheral surface of the discharge valve body 84, and the discharge valve body 84 rotates about the axis of the large diameter portion 76. In the predetermined rotation angle region, the radially outer end of the notch 88 and the aforementioned valve port 67 are overlapped with each other to open the valve port 67, while in the remaining rotation angle region, the valve port 67 is the discharge valve element. The outer peripheral surface 84 is closed. Since the axial hole 86 of the discharge valve body 84 and the small diameter portion 78 of the communication passage 66 are arranged coaxially with each other, the end face of the large diameter portion 76 is always provided regardless of the rotation of the discharge valve body 84. Communicate.

  Further, the discharge valve 62 includes a connecting portion 90 that connects the discharge valve body 84 and the movable scroll 30, and the connecting portion 90 opens the valve port 67 at a timing corresponding to the end of the refrigerant compression stroke. The discharge valve body 84 is rotated in conjunction with the turning of the movable scroll 30. More specifically, a pin hole 92 is formed in each of the end plate 34 of the movable scroll 30 and the end surface of the discharge valve body 84 that is in sliding contact with the end plate 34. The pin hole 92 extends in the axial direction of the discharge valve body 84, and the distance between the axis of the pin hole 92 of the discharge valve body 84 and the axis of the discharge valve body 84 is equal to the turning radius of the movable scroll 30. One end of a pin 94 is rotatably fitted in the pin hole 92 of the discharge valve body 84, the pin 94 projects from the discharge valve body 84 along the axis of the discharge valve body 84, and the other end of the pin 94 is The movable scroll 30 is fitted in a pin hole 92 so as not to be relatively rotatable.

  According to the above-described discharge valve 82, as shown in FIGS. 5A to 5D, as the movable scroll 30 turns with respect to the fixed scroll 32, the compression chamber 38 is reduced and the refrigerant is compressed. On the other hand, the discharge valve body 84 is rotated via the pin 94, and the rotation angle of the discharge valve body 84 changes. Then, in a predetermined rotation angle region, the discharge valve 82 is opened when the radially outer end of the notch 88 in the discharge valve body 84 and the valve port 67 overlap (FIG. 5D), and the groove 82, shaft The compressed refrigerant is discharged from the compression chamber 38 to the discharge chamber 60 through the direction hole 86 and the small diameter portion 78. In this way, the discharge valve 82 opens and closes the valve port 67 of the communication passage 66 according to the rotation angle of the discharge valve body 84 that is linked to the movable scroll 30. Therefore, the valve port 67 is opened at a predetermined timing regardless of the refrigerant flow rate. It opens and closes reliably. Therefore, in this scroll compressor, over-compression and re-compression of the refrigerant are prevented, and the load is reduced and the compression efficiency is improved. Further, since the discharge valve body 84 is not elastically deformed when opening and closing the valve port, no noise is generated even when the refrigerant flow rate increases, and this scroll compressor has excellent silence.

  As in the case of the conventional scroll compressor, in this scroll compressor, the discharge valve 82 is opened at a timing corresponding to the vicinity of the end of the refrigerant compression stroke. The end timing is the circumferential position of the pin hole 92 of the movable scroll 30, the circumferential position of the pin hole 92 of the discharge valve body 84, and the notch 88 of the discharge valve body 84 when viewed with respect to the axis of the large diameter portion 76. The circumferential position and the circumferential length and the circumferential position and the circumferential length of the valve port 67 of the fixed scroll 32 can be adjusted as appropriate.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
FIGS. 6-8 has shown the movable scroll 30, the fixed scroll 32, and the discharge valve body 84 which were applied to the scroll compressor of 2nd Example. In the second embodiment, the radially inner end 68 of the spiral wrap 36 of the fixed scroll 32 is thinner than in the first embodiment, and the through hole 70 penetrates only the end plate 34 of the movable scroll 30. However, the groove 82 is not formed in the radially inner end portion 68. Further, in the through hole 70, the diameter of the small diameter portion 78 is less than half the diameter of the large diameter portion 76, and the interval between the axis of the small diameter portion 78 and the axis of the large diameter portion 76 is the radius of the small diameter portion 78. Bigger than. That is, the small-diameter portion 78 is positioned eccentrically with respect to the large-diameter portion 76, and the step surface 80 has a C-shape. Further, the large-diameter portion 76 accommodates a disc-shaped discharge valve body 84, and an axial groove 96 is formed in the discharge valve body 84 in place of the axial hole 86 and the notch 88. The axial groove 96 extends in the axial direction of the discharge valve body 84 and opens at the outer peripheral surface and both ends of the discharge valve body 84. On the other hand, the pin hole 92 of the movable scroll 30 is formed in the side end face 98 of the spiral wall 36 of the movable scroll 30. In the case of this second embodiment, the valve port 67 comprises an opening of a small diameter portion 78 defined by the step surface 80, and when the discharge valve body 84 rotates around the axis of the large diameter portion 76, a predetermined rotation angle region is obtained. Then, the opening end of the axial groove 96 and the valve port 67 are overlapped with each other to open the valve port 67, while the valve port 67 is opened by the end surface of the discharge valve body 84 positioned on the stepped surface 80 side in the remaining rotation angle region. Blocked.

  Therefore, also in the case of the second embodiment, as shown in FIGS. 9A to 9D, as the movable scroll 30 turns with respect to the fixed scroll 32, the compression chamber 38 is reduced and the refrigerant is reduced. Is compressed, the discharge valve body 84 is rotated via the pin 94, and the rotation angle of the discharge valve body 84 changes. Then, in a predetermined rotation angle region, the discharge valve is opened when the opening end diameter of the axial groove 96 in the discharge valve body 84 and the valve port 67 overlap (FIG. 9D), and the axial groove 96 and The compressed refrigerant is discharged from the compression chamber 38 to the discharge chamber 60 through the small diameter portion 78. Thus, also in the discharge valve of the second embodiment, the valve port 67 of the communication passage 66 is opened and closed according to the rotation angle of the discharge valve body 84 interlocked with the movable scroll 30, so that the valve port 67 can be opened at a desired timing. It can be opened reliably.

As can be seen from the first and second embodiments described above, the discharge valve applied to the scroll compressor of the present invention only needs to include a discharge valve body that rotates in conjunction with the turning of the movable scroll. The shapes and positions of the body, the connecting portion, the communication passage, and the valve port are not particularly limited.
However, if the communicating path is formed through the end plate 34 of the fixed scroll 32 or the end plate 34 of the fixed scroll 32 and the spiral wall 36, the outer diameter shape of the scroll unit 28 itself does not change, and the conventional scroll compressor This is preferable because a common housing can be used.

  Further, if a cylindrical large-diameter portion (valve chamber) is formed in the communication passage, and a discharge valve body is arranged in the valve chamber so as to be rotatable around the axis of the large-diameter portion, the inner peripheral surface of the valve chamber The gap with the outer peripheral surface of the discharge valve body can be reduced, and the discharge valve is formed compact, which is preferable, and the dead volume in the scroll unit 28 is reduced, so that the recompression of the refrigerant is further reduced. The compression efficiency can be further increased. Further, in this case, when the discharge valve body has an outer peripheral surface that is slidably contacted with the inner peripheral surface of the valve chamber as in the first and second embodiments, a rotating shaft that pivotally supports the discharge valve body is not provided. This is also preferable because the discharge valve body can rotate around the axis of the valve chamber, and the discharge valve can be formed with a simple configuration.

  Further, if the large-diameter portion (valve chamber) extends along the axis of the fixed scroll and opens toward the movable scroll 30, the movable scroll from the discharge valve body along the axis of the valve chamber serves as a connecting portion. A pin protruding toward 30 can be used, and the discharge valve is formed with a simple configuration, which is preferable. In this case, as in the first and second embodiments, if the pin is positioned away from the axis of the valve chamber by a distance equal to the turning radius of the movable scroll 30, the axis of rotation of the discharge valve body and the axis of the valve chamber And exactly match. For this reason, since the outer peripheral surface of the discharge chamber is uniformly slidably contacted with the inner peripheral surface of the valve chamber and the discharge valve body rotates smoothly, the operation of the discharge valve can be stabilized. In addition, at least one of both ends of the pin only needs to be rotatably fitted to the pin hole, and the pin is integrally formed on one of the movable scroll and the discharge valve body, and the pin hole is formed on the other. It may be formed.

  Further, when the outer peripheral surface of the discharge chamber is slidably contacted with the inner peripheral surface of the valve chamber, the valve port is connected to the inner peripheral surface of the large-diameter portion (the peripheral wall of the valve chamber) as in the first embodiment. If the outer peripheral surface of the discharge valve body is used as a sealing surface, the discharge valve can be formed with a simple configuration. On the other hand, if the valve port is formed in the end face of the large diameter portion (end wall of the valve chamber) as in the case of the second embodiment, the discharge valve body becomes the end wall of the valve chamber by the pressure of the refrigerant in the compression chamber 38. The end face of the discharge valve body is brought into close contact with the end wall of the valve chamber, so that the valve opening can be reliably closed with a simple configuration.

It is a longitudinal cross-sectional view of the scroll compressor of 1st Example. The movable scroll of the scroll compressor of FIG. 1 is shown, (a) is a front view, (b) is sectional drawing which follows the IIb-IIb line | wire in (a). The fixed scroll of the scroll compressor of FIG. 1 is shown, (a) is a front view, (b) is sectional drawing which follows the IIIb-IIIb line | wire in (a). The discharge valve body of the scroll compressor of FIG. 1 is shown, (a) is a front view, (b) is sectional drawing in alignment with the IVb-IVb line | wire in (a), (c) is a rear view. It is a cross-sectional view of the scroll unit in the scroll compressor of FIG. 1, (a)-(c) is arrangement | positioning at the time of a compression stroke (discharge valve close), (d) is at the time of a discharge stroke (discharge valve open). Indicates placement. The movable scroll of 2nd Example is shown, (a) is a front view, (b) is sectional drawing which follows the VIb-VIb line | wire in (a). The fixed scroll of 2nd Example is shown, (a) is a front view, (b) is sectional drawing which follows the VIIb-VIIb line | wire in (a). The discharge valve body of 2nd Example is shown, (a) is a front view, (b) is sectional drawing which follows the VIIIb-VIIIb line | wire in (a). It is a cross-sectional view of the scroll unit of 2nd Example, (a)-(c) is arrangement | positioning at the time of a compression stroke (discharge valve close), (d) is arrangement | positioning at the time of a discharge stroke (discharge valve open). Show.

Explanation of symbols

2 Housing 30 Movable scroll 32 Fixed scroll 34 End plate 36 Swirl wall 38 Compression chamber 60 Discharge chamber 66 Communication path 76 Large diameter portion (valve chamber)
84 Discharge valve body 94 Pin (connecting part)

Claims (9)

A movable and fixed scroll which are arranged to mesh with each other to form a compression chamber in the housing, and perform the suction of the working gas into the compression chamber and the compression of the working gas in the compression chamber in cooperation with each other;
A discharge valve provided in the housing, opened at the end of the compression stroke of the compressed working gas, and discharging the compressed working gas from the compression chamber to a discharge chamber adjacent to the fixed scroll in the housing. Scroll compressor,
The discharge valve is
A communication path provided at a radial center of the fixed scroll, and connecting between the compression chamber and the discharge chamber;
A valve port formed in the communication path;
A discharge valve body that is rotatably arranged in the communication path and opens and closes the valve opening according to a rotation angle;
A connecting portion that connects the discharge valve body and the movable scroll, and rotates the discharge valve body in conjunction with the turning of the movable scroll to open the valve port at a timing corresponding to the end of the compression stroke; A scroll compressor characterized by comprising:   The scroll compressor according to claim 1, wherein the communication path is provided through an end plate of the fixed scroll.   2. The scroll compressor according to claim 1, wherein the communication path includes a through-hole penetrating an end plate and a spiral wall of the fixed scroll. The communication passage has a cylindrical valve chamber,
The scroll compressor according to any one of claims 1 to 3, wherein the discharge valve body is disposed in the valve chamber so as to be rotatable around an axis of the valve chamber.   The scroll compressor according to claim 4, wherein the discharge valve body has an outer peripheral surface that is in sliding contact with an inner peripheral surface of the valve chamber. The valve chamber extends along an axis of the fixed scroll and opens toward the movable scroll;
The scroll compressor according to claim 5, wherein the connecting portion includes a pin protruding from the discharge valve body toward the movable scroll along the axis of the valve chamber.   The scroll compressor according to claim 6, wherein the pin is positioned away from the axis of the valve chamber by a distance equal to a turning radius of the movable scroll.   The scroll compressor according to claim 7, wherein the valve port is formed in a peripheral wall of the valve chamber.   The scroll compressor according to claim 7, wherein the communication path has a partition wall between the valve chamber and the discharge chamber, and the valve port is formed in the partition wall.

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