JP2001132668A - Variable displacement scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the opening area of bypass holes while reducing a manufactusing cost of a variable displacement scroll compressor. SOLUTION: A first center line segment LA connecting the center of a first bypass hole 114A of a first operating chamber Vc1 to the center of a first bypass hole 114a of a second operating chamber Vc2 in the same state as the first operating chamber Vc1, a second center line segment LB connecting the center of a second bypass hole 114B of the first operating chamber Vc1 to the center of a second bypass hole 114b of the second operating chamber Vc2 and a third center line segment LC connecting the center of a third bypass hole 114C of the first operating chamber Vc1 to the center of a third bypass hole 114c of the second operating chamber Vc2 are crossed with each other. The lengths a1 to a3 of the respective center line segments LA to LC become equal to each other, and three congruent triangular apexes using midpoints CA, CB, CC of the respective center line segments LA to LC or the respective center line segments LA to LC as a base are juxtaposed on the same straight line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable displacement scroll compressor, and is effective when applied to a vehicle refrigeration cycle (vehicle air conditioner).

[0002]

2. Description of the Related Art The structure of a variable capacity scroll compressor is as follows.
For example, as described in JP-A-9-296787,
A discharge hole (substantial suction amount) is changed by providing a fixed scroll with a bypass hole communicating the working chamber and the suction side during the compression stroke, and opening and closing the bypass hole by a spool valve.

[0003]

By the way, in a scroll type compressor, a working chamber (compression chamber) for sucking and compressing a fluid (refrigerant in a refrigeration cycle) has a spiral shape while changing its volume with the turning of the orbiting scroll. Moving to the center, at this time, there are always two working chambers in a state where the volumes (degrees of compression) are substantially equal to each other with the center of the spiral (discharge port) interposed therebetween.

Therefore, when providing the bypass holes, it is desirable to provide the bypass holes in the working chambers in substantially the same state as shown in FIG.

Further, if the opening area (hole diameter) of the bypass hole is small, the pressure loss (flow resistance) in the bypass hole increases, so that the bypass hole is opened especially when the rotation speed of the orbiting scroll is high. However, since a sufficient amount of fluid does not flow to the suction side, there arises a problem that the discharge capacity cannot be sufficiently reduced.

In order to solve this problem, the opening area of the bypass hole is increased by increasing the number of the bypass holes, and the like.
Although it is necessary to reduce the pressure loss in the bypass holes, simply increasing the number of bypass holes, in combination with providing bypass holes in each of the working chambers in a substantially equal state, causes a work (fixed scroll) In addition, the amount of movement of the drill for drilling holes increases, and it is necessary to move the work or the drill in the X-Y direction (two-dimensional).

Therefore, the number of processing steps for providing the bypass hole increases, and the work or the drill is
-Since an expensive machine tool (machining center) that can be moved in the Y direction (two-dimensional) is required, the manufacturing cost of the variable capacity scroll compressor is increased.

In view of the above, it is an object of the present invention to increase the opening area of a bypass hole while reducing the manufacturing cost of a variable displacement scroll compressor.

[0009]

According to a first aspect of the present invention, in a variable displacement scroll compressor, a bypass hole (114) is provided.
First and second bypass holes (114A, 114B, 114a, 1a, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 2c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c, 1c)
14b), at least four in total, and furthermore, the center of the first bypass hole (114A) of the first working chamber (Vc1) and the first bypass hole (114a) of the second working chamber (Vc2). ), The first center line segment (L
A) and the second bypass hole (1) in the first working chamber (Vc1).
14B) and a second center line segment (LB) connecting the center of the second bypass hole (114b) of the second working chamber (Vc2) intersects with each other and has a length of both center line segments (LA, LB). Are equal to each other.

This makes it possible to form two sets of bypass holes for determining the respective center line segments (LA, LB) as a set and simultaneously form them, which is necessary for drilling (bypass hole formation). Man-hours (time) can be reduced, and while increasing the opening area of the bypass hole (114),
The manufacturing cost of the variable capacity scroll compressor can be reduced.

According to the second aspect of the present invention, in the variable displacement scroll compressor, the first and second working chambers (Vc1) in which the bypass hole (114) is substantially equal in the compression stroke of the working chamber (Vc). , Vc2) respectively
3 Bypass holes (114A to 114C, 114a to 114
c), at least six of them are provided, and the first bypass hole (114) of the first working chamber (Vc1) is further provided.
A first center line segment (LA) connecting the center of A) to the center of the first bypass hole (114a) of the second working chamber (Vc2);
The center of the second bypass hole (114B) of the working chamber (Vc1) and the second bypass hole (114b) of the second working chamber (Vc2).
A second center line segment (LB) connecting the centers of the first and second centers and the center of the third bypass hole (114C) of the first working chamber (Vc1).
Third center line segments (LC) connecting the centers of the third bypass holes (114c) of the working chamber (Vc2) intersect with each other, and the lengths of the respective center line segments (LA to LC) are equal to each other.
In addition, the midpoints (CA, CB,
CC) are characterized by being aligned on the same straight line.

[0012] This makes it possible to form two sets of two bypass holes for determining the respective center line segments (LA, LB, LC), and to form them at the same time, as in the first aspect of the present invention. Therefore, man-hours (time) required for drilling (bypass hole formation) can be reduced, and the manufacturing cost of the variable displacement scroll compressor can be reduced.

Since the center points (CA, CB, CC) of the respective center line segments (LA to LC) are aligned on the same straight line,
As described later, a plurality of sets of bypass holes (114) can be formed by using two sets of bypass holes without moving a work or a drill in the XY directions (two-dimensionally).

Therefore, the bypass hole (114) can be formed without introducing an expensive machine tool (machining center) (investing in equipment), and in combination with the effect of reducing the number of manufacturing steps of the bypass hole (114), The manufacturing cost of the variable displacement scroll compressor can be further reduced while increasing the opening area of the bypass hole (114).

According to the third aspect of the present invention, in the variable displacement scroll compressor, the bypass hole (114) is formed by the first to fourth bypass holes (114A, 114B, 114a, 1).
14b), at least four are provided, and a first center line (LA) connecting the center of the first bypass hole (114A) and the center of the third bypass hole (114a);
The second center line (LB) connecting the center of the second bypass hole (114B) and the center of the fourth bypass hole (114b) intersects each other, and the lengths of both center lines (LA, LB) are mutually different. It is characterized by being equal.

Thus, similarly to the first aspect of the present invention, two bypass holes for determining the respective center line segments (LA, LB) can be formed as one set and formed simultaneously. In addition, the man-hour (time) required for drilling (bypass hole formation) can be reduced, and the bypass hole (11
4) The manufacturing cost of the variable displacement scroll compressor can be reduced while increasing the opening area of 4).

According to the fourth aspect of the present invention, the fixed scroll (104) and the orbiting scroll (105) are provided, and the fluid is sucked and compressed by turning the orbiting scroll (105) with respect to the fixed scroll (104). A compression mechanism (Cp) for expanding and contracting the working chamber (Vc); a bypass hole (114) for communicating the working chamber (Vc) during the compression stroke with the suction side of the compression mechanism (Cp);
14) A variable displacement scroll compressor having a valve element (116) for opening and closing the first and second working chambers of the working chamber (Vc) in which the bypass hole (114) is in a substantially equal state in the compression stroke. (Vc1, Vc2) respectively
3 Bypass holes (114A to 114C, 114a to 114
c), and a total of at least six are provided, the center of the first bypass hole (114A) of the first working chamber (Vc1) and the first bypass hole (114) of the second working chamber (Vc2).
a) a first center line segment (LA) connecting the centers of (a), the center of the second bypass hole (114B) of the first working chamber (Vc1) and the second
A second center line (LB) connecting the centers of the second bypass holes (114b) of the working chamber (Vc2), and a first working chamber (Vc2).
The third center line (LC) connecting the center of the third bypass hole (114C) of 1) and the center of the third bypass hole (114c) of the second working chamber (Vc2) intersects with each other and each center line segment. The lengths of (LA-LC) are equal to each other, and
When assuming three congruent triangles each having the center line segment (LA to LC) as the base, the vertices of these triangles are arranged on the same straight line.

[0018] Thus, the man-hour (time) required for drilling (bypass hole formation) can be reduced, and the work or the drill can be moved in the XY direction (2). Without moving it two-dimensionally)
A plurality of bypass holes (11
Since 4) can be formed, the manufacturing cost of the variable displacement scroll compressor can be reduced.

Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a variable displacement scroll compressor (hereinafter abbreviated as a compressor) according to the present invention is applied to a vehicle refrigeration cycle (vehicle air conditioner). FIG. 1 is a schematic diagram of a vehicle refrigeration cycle (hereinafter, abbreviated as a cycle).

Reference numeral 100 denotes a compressor according to the present embodiment,
Reference numeral 200 denotes a condenser (radiator) for cooling the refrigerant (fluid) discharged from the compressor 100. 300 decompresses the refrigerant flowing out of the condenser 200 and evaporator 4 described later.
Reference numeral 400 denotes an expansion valve (decompressor) whose opening is controlled so that the degree of heating on the outlet side of the expansion valve becomes a predetermined value.
This is an evaporator for evaporating the liquid-phase refrigerant decompressed at.

The compressor 100 has a V-belt 510,
The vehicle is driven by a vehicle driving engine (hereinafter abbreviated as engine) 500 via a power transmission means (not shown) for transmitting power intermittently such as a pulley 520 and an electromagnetic clutch.

Reference numeral 600 denotes a driving load sensor (driving load detecting means) for detecting an opening of a load of the engine 500 (in this embodiment, a throttle valve (not shown)). An electronic control unit (ECU) that controls a pressure adjusting unit 118 (first and second solenoid valves 118b and 118d) described below in accordance with a program set in advance based on the detected value.

Next, the structure of the compressor 100 will be described.

FIG. 2 shows a cross section of the compressor 100.
Reference numeral 101 denotes a shaft that is rotationally driven via power transmission means (an electromagnetic clutch). Reference numeral 102 denotes a front housing that holds a rolling bearing 103 that rotatably supports the shaft 101. A fixed scroll (fixed portion) 104 having a spiral tooth portion 104a is fixed to the front housing 102. .

The space defined by the fixed scroll 104 and the front housing 102 has a tooth 1
An orbiting scroll (movable portion) 105 provided with a spiral tooth portion 105a that meshes with the rotating scroll 104a is provided. The orbiting scroll 105 is a crank ( Eccentric part)
It is rotatably attached to 101a via a bearing 101b and a bushing 101c.

In this embodiment, the bushing 10
1c is slightly slidable with respect to the crank portion 101a, and slides the orbiting scroll 105 in a direction in which the contact pressure between the two tooth portions 104a and 105a increases due to the compression reaction force acting on the orbiting scroll 105. As a result, the contact pressure between the teeth 104a and 105a is increased (driven crank mechanism).

The orbiting scroll 105 orbits around the shaft 101 together with the rotation of the shaft 101, so that the volume of the working chamber Vc formed by the two scrolls 104 and 105 is enlarged or reduced to suck and compress the refrigerant. Hereinafter, a mechanism that sucks and compresses the refrigerant of the scrolls 104 and 105 and the like is referred to as a compression mechanism Cp.

A suction chamber 106 communicates with a suction port (not shown) connected to the outlet side of the evaporator 400.
A discharge chamber 107 communicates with a discharge port (not shown) connected to the inlet side of the condenser 200 and smoothes the pulsation of the refrigerant discharged from the working chamber Vc. And the discharge chamber 1
07 is an end plate portion (tooth portion 104a) of the fixed scroll 104.
Working chamber Vc through a discharge port 104c (see FIG. 3) formed in a plate-shaped portion 104b formed at the root of
A discharge valve 108 in the form of a reed valve for preventing the refrigerant from flowing backward from the discharge chamber 107 to the working chamber Vc is provided on the discharge chamber 107 side of the discharge port.

The discharge chamber 107 is formed in a space surrounded by the rear housing 151 fixed to the fixed scroll 104 via a gasket (not shown) and the fixed scroll 104. Also, the discharge valve 108
The end plate portion 104b is bolted together with a valve stop plate (valve retainer) 109 for regulating the maximum opening of the discharge valve 108.
Are fixed together.

As shown in FIG. 3, a bypass port (bypass hole) 114 for communicating the working chamber Vc and the suction chamber 106 during the compression stroke is formed in the end plate portion 104b. 114 is the end plate portion 104b
Of the working chamber Vc is about 5
It is provided at a site where the percentage is 0%.

The bypass port 114 has first to third bypass ports 114A to 114C and 114a to 114c in the first and second working chambers Vc1 and Vc2 of the working chamber Vc which are substantially in the same state in the compression stroke. Thus, a total of at least six are provided. The first
-3 bypass ports 114A-114C, 114a-1
14c is positioned so that the center thereof draws a substantially circular arc along the involute curve of the tooth portion 105a.

A first center line LA connecting the center of the first bypass port 114A of the first working chamber Vc1 and the center of the first bypass port 114a of the second working chamber Vc2, the second bypass of the first working chamber Vc1. Port 114B center and second
A second center line LB connecting the center of the second bypass port 114b of the working chamber Vc2, and a center of the third bypass port 114C of the first working chamber Vc1 and the center of the third bypass port 114c of the second working chamber Vc2. The third center line segments LC intersect each other, the lengths a1 to a3 of the respective center line segments LA to LC are equal to each other, and the respective center line segments LA to L
The middle points CA to CC of C are the same straight line (in this embodiment, the second
Center line segment LB).

When the shaft 101 is rotated, the orbiting scroll 105 tries to rotate around the crank portion 101a. However, as shown in FIG. 2, a well-known rotation preventing mechanism 105c including a pin and a ring is provided. Therefore, the orbiting scroll 105 does not rotate, but orbits (revolves) around the shaft 101.

As shown in FIGS. 2 and 3, a guide cylinder bore (cylindrical hole) 115 extending in a straight line is formed in the end plate portion 104b, and this guide cylinder bore (hereinafter, abbreviated as a cylinder) is formed. .) 115, a spool valve element (hereinafter, abbreviated as spool) 116 for opening and closing the bypass port 114 is slidably disposed.

The spool 116 is provided with the cylinder 1
The first and second valve portions 116a open and close the bypass port 114 with an outer dimension substantially equal to the inner diameter of the cylinder 15, and the passage of the refrigerant flowing out of the bypass port 114 having an outer dimension smaller than the inner diameter of the cylinder 115. Is formed.

The bypass passages 117a to 117c guide the refrigerant flowing out of the bypass port 114 to the suction chamber 106.

By the way, one end of the spool 116 in the sliding direction (the direction of the arrow in FIG. 2) (in this embodiment, the upper side of FIGS. A coil spring (elastic means) 118c that exerts an elastic force for pressing the pressure 116 is provided, and the suction pressure (pressure in the suction chamber 106) Ps of the compression mechanism Cp acts via the bypass passages 117a and 117c. ing. Hereinafter, the elastic force Fs of the coil spring 118c and the suction pressure P acting on one end of the spool 116 in the sliding direction will be described.
The force due to s is called the valve opening force.

On the other hand, the other end of the spool 116 in the sliding direction (the lower side of FIGS. 2 and 3 in the present embodiment) is adjusted to reduce the discharge pressure Pd of the compression mechanism Cp as shown in FIG. Pressure adjusting means 118 is provided for causing the adjusted pressure (hereinafter, this adjusted pressure is referred to as control pressure Pc) to be applied to the other end of the spool 116 in the sliding direction.

Hereinafter, the other end of the spool 116 in the sliding direction (the space 119 in which the control pressure Pc is introduced) is referred to as a control pressure chamber 119, and the control pressure acting on the other end of the spool 116 in the sliding direction. The force due to Pc is called a valve closing force.

The pressure adjusting means 118 is provided in the suction chamber 10.
Control passage 118a for communicating the pressure chamber 6 with the control pressure chamber 119
And a solenoid valve (valve means) 11 for opening and closing the control passage 118a
8b. Incidentally, the solenoid valve 118b
Is a normally open solenoid valve.

Reference numeral 120 denotes a stopper which regulates the maximum displacement of the spool 116 and also serves as a lid (plug) for closing one end of the cylinder 115. Reference numeral 121 denotes a predetermined pressure loss between the discharge chamber 107 and the control pressure chamber 119. Is a fixed diaphragm (diaphragm means) that communicates with the diaphragm.

Next, the general operation of the compressor 100 will be described.

1. At the time of minimum capacity (about 50%) operation, the control passage 118a is communicated by shutting off the power supply to the solenoid valve 118b.

As a result, the control pressure Pc in the control pressure chamber 119 becomes the suction pressure Ps.
The valve opening force exceeds the valve closing force due to the elastic force Fs of c, and the spool 116 slides and displaces in the direction of the elastic force Fs until the spool 116 collides with the stopper 120. In this state, since the bypass port 114 is opened, the refrigerant once sucked into the working chamber Vc returns to the suction chamber 106 from the bypass port 114 in the compression stroke, and the discharge capacity of the compressor 100 (compression mechanism Cp) becomes It is about 50% of the maximum.

3. When the maximum capacity (100%) operation is performed, the control passage 11 is energized by energizing the first solenoid valve 118b.
8a is closed.

As a result, the control pressure Pc becomes the discharge pressure Pd, so that the valve closing force exceeds the valve opening force, and the coil spring 1
18c is compressed by the elastic force Fs.
Sliding displacement in the direction opposite to the direction of In this state, since the bypass port 114 is configured to close, the discharge capacity of the compressor 100 (compression mechanism Cp) becomes the maximum capacity.

Next, the features of this embodiment will be described.

First to third bypass ports 114A to 114
As described above, C, 114a to 114c are positioned so that their centers draw circular arcs, and therefore, each of the center line segments LA to 114c.
LC is the first to third bypass ports 1 as shown in FIG.
It can be regarded as a chord with respect to the center O of the arc S1 drawn by the centers of 14A to 114C and 114a to 114c.

At this time, the length a of each center line segment LA-LC
Since 1 to a3 are equal to each other, the bypass port 114
A, 114a and a center O, an isosceles triangle OAa,
An isosceles triangle OBb composed of bypass ports 114B and 114b and a center O;
The isosceles triangle OCc consisting of 14c and the center O is a congruent isosceles triangle.

Therefore, as in the present embodiment, when the lengths a1 to a3 of the center line segments LA to LC are equal to each other and intersect each other, the isosceles triangle O
Since Bb and OCc are obtained by rotating the isosceles triangle OAa around the center O, as shown in FIG. 5, the first and second drills Dri are used to hold the first and second isosceles.
The two working chambers Vc1 and Vc2 can be simultaneously drilled.

Therefore, the drilling process (formation of the bypass port 114) can be performed by using two bypass ports as one set, and the man-hour (time) required for the drilling process can be performed.
Can be reduced. By extension, bypass port 1
It is possible to reduce the manufacturing cost of the compressor 100 while increasing the number of 14 and increasing the opening area of the bypass port 114.

In the above description, the vertices (centers O) of the triangles are described as being coincident for easy understanding. However, in reality, they do not completely coincide with each other, but the deviation is slight. Therefore, there is no practical problem even if it is considered as described above.

In the present embodiment, the center line segment is considered with the bypass port 114A and the bypass port 114a, the bypass port 114B and the bypass port 114b, and the bypass port 114C and the bypass port 114c as a set. Bypass port 114A and bypass port 114c, bypass port 114B and bypass port 114b, bypass port 114C
When the center line segments are considered as a pair with the bypass port 114a, these center line segments do not cross each other and have different lengths. Therefore, drilling cannot be performed with two bypass ports as one set.

By the way, isosceles triangles OBb, OCc
Is obtained by rotating the isosceles triangle OAa around the center O. Therefore, when each bypass port 114 is set so as to simply rotate the isosceles triangle OAa around the center O, one set of holes is formed. Each time the machining is completed, the two drills Dri are rotationally moved at the center between the two drills Dri, and the fixed scroll 104 is moved by the drill Dr.
It is necessary to move in the X-Y direction (i.e., up, down, left, and right on the paper) with respect to i.

On the other hand, as in the present embodiment, the midpoints CA to CC of the respective center line segments LA to LC are arranged so as to be aligned on the same straight line (in this embodiment, the second center line segment LB). When the ports 114 are set, as shown in FIG. 3, the fixed scroll 104 is moved in a straight line without moving in the XY directions (up, down, left, and right directions on the paper surface), thereby forming each set of bypass ports 114 (114A to 114A). 114C,
114a to 114c) can be formed.

More specifically, first, the bypass ports 114A and 114a are formed with the drill reference line (not shown) connecting the two drills Dri aligned with the center line LA, and then the drill reference line is formed. The two drills Dri are rotationally moved so that the minutes coincide with the center line LB, and the fixed scroll 104 is moved so that the midpoint of the drill reference line moves from the midpoint CA to the midpoint CB. After being moved linearly, bypass ports 114B and 114b are formed.

Thereafter, the two drills Dri are rotated so that the drill reference line segment coincides with the center line segment LC, and the midpoint of the drill reference line segment is shifted from the midpoint CB to the midpoint CC. After moving the fixed scroll 104 linearly so as to move, the bypass ports 114C, 11C
4c is formed.

Therefore, there is no need to move the fixed scroll 104 (work) or the drill Dri in the X-Y direction (two-dimensionally), so that an expensive machine tool (machining center) is not introduced (capital investment is made). , A bypass port 114 can be formed.

Therefore, the bypass port 114 (11
4A to 114C and 114a to 114c), the manufacturing cost of the compressor 100 can be further reduced. (Other Embodiments) In the above embodiment, the fixed scroll 104 is moved linearly. Although the two drills Dri are rotated, the fixed scroll 104 may be fixed and the two drills Dri may be moved linearly and rotationally.

The first to third bypass ports 114A to 114A
The positional relationship between 114C and 114a to 114c is shown in FIGS.
Is not limited to the relationship shown in FIG. 6, and even if the relationship is as shown in FIG.
114C and first to third bypass ports 114a to 114c
Is provided in the first and second working chambers Vc1 and Vc2 of the working chamber Vc, which are substantially in the same state in the compression stroke.

Further, in the above-described embodiment, the total number of bypass ports 114 is six, but the present invention is not limited to this, and two or more bypass ports 114 are provided for each of the first and second working chambers Vc1 and Vc2. It suffices if the total is four or more. In addition,
When the number of bypass ports 114 is four in total, the number of center lines is two, so it is practically irrelevant whether or not the center point of the center line is located on the same straight line.

In the above embodiment, each center line segment L
A to LC intersect each other, and their lengths a1 to a
3 are equal to each other, and the midpoints CA to CC of the respective center line segments LA to LC are arranged on the same straight line, but at least the respective center line segments LA to LC intersect each other and have a length a
If 1 to a3 are equal to each other, two bypass ports 114 can be formed at the same time, as described above.
The present invention can be implemented even if the midpoints CA to CC of the respective center line segments LA to LC are not aligned on the same straight line.

In the above-described embodiment, a plurality of bypass ports 1 are provided in each of the first and second working chambers Vc1 and Vc2 of the working chamber Vc which are substantially in the compression stroke.
The present invention is not limited to this, but may be applied to a configuration in which a plurality of bypass ports 114 are arranged in a substantially arc shape.

In the above-described embodiment, the midpoint of the drill reference line segment coincides with the midpoints CA to CC of the center line segments LA to LC. The center lines LA to LC may be arranged at positions shifted from the midpoints CA to CC. In addition, as shown in FIG. 7, when the midpoint of the drill reference line segment is arranged at a position shifted from the midpoints CA to CC of the center line segments LA to LC, the center line segments LA to LC are positioned at the bases. Assuming three congruent triangles,
The vertices of these triangles are aligned on the same straight line.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a refrigeration cycle.

FIG. 2 is a cross-sectional view of the compressor according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an explanatory diagram for explaining an effect of the compressor according to the embodiment of the present invention.

FIG. 5 is a schematic view of a drill forming a bypass port of the compressor according to the embodiment of the present invention.

FIG. 6A shows a compressor according to a modification of the present invention.
It is sectional drawing corresponding to -A cross section.

FIG. 7 is a schematic view of a drill forming a bypass port of a compressor according to a modification of the present invention.

[Explanation of symbols]

104: fixed scroll, 114: bypass port (bypass hole), 116: spool valve.

Claims (4)

[Claims] An orbiting scroll (105) having a fixed scroll (104) and an orbiting scroll (105);
5) a compression mechanism (Cp) for expanding or reducing a working chamber (Vc) for sucking and compressing a fluid by orbiting the fixed scroll (104), and the working chamber (Vc) and the compression mechanism during a compression stroke. A bypass hole (114) communicating with the suction side of (Cp), and the bypass hole (11);
4) A variable displacement scroll type compressor provided with a valve element (116) for opening and closing a valve body, wherein the bypass hole (114) is in the first and second working chambers (Vc) in a substantially equal state during a compression stroke. The first and second bypass holes (1) are provided in the working chambers (Vc1, Vc2), respectively.
14A, 114B, 114a, 114b), and a total of at least four are provided. Further, the center of the first bypass hole (114A) of the first working chamber (Vc1) and the second working chamber (Vc2) ) First
A first center line (L) connecting the centers of the bypass holes (114a)
A) and the center of the second bypass hole (114B) of the first working chamber (Vc1) and the second of the second working chamber (Vc2).
A second center line (L) connecting the centers of the bypass holes (114b)
B) intersect each other, and the two center line segments (L
A, LB), wherein the lengths are equal to each other. 2. An orbiting scroll (10) having a fixed scroll (104) and an orbiting scroll (105).
5) a compression mechanism (Cp) for expanding or reducing a working chamber (Vc) for sucking and compressing a fluid by orbiting the fixed scroll (104), and the working chamber (Vc) and the compression mechanism during a compression stroke. A bypass hole (114) communicating with the suction side of (Cp), and the bypass hole (11);
4) A variable displacement scroll type compressor provided with a valve element (116) for opening and closing a valve body, wherein the bypass hole (114) is in the first and second working chambers (Vc) in a substantially equal state during a compression stroke. The first to third bypass holes (1) are respectively provided in the working chambers (Vc1, Vc2).
14A to 114C, 114a to 114c), and a total of at least six are provided. Further, the center of the first bypass hole (114A) of the first working chamber (Vc1) and the second working chamber (Vc2) ) First
A first center line (L) connecting the centers of the bypass holes (114a)
A), a second bypass hole (1) of the first working chamber (Vc1).
14B) and a second center line (L) connecting the center of the second bypass hole (114b) of the second working chamber (Vc2).
B) and the center of the third bypass hole (114C) of the first working chamber (Vc1) and the third of the second working chamber (Vc2).
A third center line (L) connecting the centers of the bypass holes (114c)
C) cross each other and each of the center line segments (LA)
-LC), and the center points (CA, CB, CC) of the center line segments (LA-LC) are aligned on the same straight line. Machine. 3. An orbiting scroll (10) having a fixed scroll (104) and an orbiting scroll (105).
5) a compression mechanism (Cp) for expanding or reducing a working chamber (Vc) for sucking and compressing a fluid by orbiting the fixed scroll (104), and the working chamber (Vc) and the compression mechanism during a compression stroke. A bypass hole (114) communicating with the suction side of (Cp), and the bypass hole (11);
4) A variable displacement scroll type compressor provided with a valve element (116) for opening and closing 4), wherein the bypass hole (114) has first to fourth bypass holes (1).
14A, 114B, 114a, 114b), and at least four are provided. Further, a first center line connecting the center of the first bypass hole (114A) and the center of the third bypass hole (114a). (LA), and a second center line (LB) connecting the center of the second bypass hole (114B) and the center of the fourth bypass hole (114b) intersects each other and the two center line segments (LA). , LB) are equal in length to each other. 4. An orbiting scroll (10) having a fixed scroll (104) and an orbiting scroll (105).
5) a compression mechanism (Cp) for expanding or reducing a working chamber (Vc) for sucking and compressing a fluid by orbiting the fixed scroll (104), and the working chamber (Vc) and the compression mechanism during a compression stroke. A bypass hole (114) communicating with the suction side of (Cp), and the bypass hole (11);
4) A variable displacement scroll type compressor provided with a valve element (116) for opening and closing the first and second valve bodies (116), wherein the bypass hole (114) is in the first and second working chambers (Vc) in a substantially equal state during a compression stroke. The first to third bypass holes (1) are respectively provided in the working chambers (Vc1, Vc2).
14A to 114C, 114a to 114c), and a total of at least six are provided. The first bypass hole (114) of the first working chamber (Vc1) is provided.
A first center line (LA) connecting the center of A) to the center of the first bypass hole (114a) of the second working chamber (Vc2), and the second bypass hole (114B) of the first working chamber (Vc1).
And a second center line (LB) connecting the center of the second working chamber (Vc2) to the center of the second bypass hole (114b) of the second working chamber (Vc2), and the third bypass hole (114) of the first working chamber (Vc1).
A third center line (LC) connecting the center of C) and the center of the third bypass hole (114c) of the second working chamber (Vc2) intersects each other, and each of the center lines (LA to LC).
Are equal to each other, and each of the center line segments (LA to LC) is a base.
A variable displacement scroll compressor characterized in that when three congruent triangles are assumed, the vertices of the triangles are arranged on the same straight line.