JPH0666272A - Scroll fluid machine - Google Patents

Abstract

PURPOSE:To prevent liquid compression action and to cause smooth compression action even at the start of a scroll fluid machine by providing liquid refrigerant injection pores through a fixed-scroll end plate portion, and positioning each of the injection pores so that it is intermittently communicated with a gas pressure effluent hole via a sealed space. CONSTITUTION:As a mechanism for injecting liquid refrigerant for cooling operating gas, a liquid-refrigerant inlet pore 139a, 139b is provided through the end plate portion 101a of a fixed scroll member 101 and is opened opposite to the lap addendum face of a rotary scroll member 105. This opening is provided in a position represented by the expression lambdab>lambdain>lambdab-2pi so that it is intermittently communicated with a gas pressure effluent pore 124a, 124b via a sealed space 121 by the rotary motion of the rotary scroll member 105 connected to the sealed space 121. In the expression lambdain represents the liquid- refrigerant inlet pore, and lambdab represents the angle (rad) of winding of a scroll lap at the position of the gas pressure effluent pore. Liquid compression action can thus be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine used as a refrigerant compressor for refrigeration and air conditioning.

[0002]

2. Description of the Related Art In a conventional scroll fluid machine, as disclosed in Japanese Utility Model Laid-Open No. 56-85087, a liquid refrigerant is placed in a compression space formed by both scroll members in order to cool a working gas. The implanting structure is shown.

[0003]

With the cooling system for the working gas in the above cited example, the incompressible liquid refrigerant in the injected closed space is filled up at the time of starting or immediately before stopping the compressor. So that liquid compression occurs,
The scroll wrap may be damaged. Alternatively, there is a problem in that the orbiting scroll member separates from the fixed scroll member due to an abnormally high internal pressure of the closed space, the compression action is lost, and a phenomenon of starting failure is exhibited.

It is an object of the present invention to prevent the liquid compression action between the scroll members described above. Another object is to eliminate the start-up failure phenomenon found in the prior art by promoting a smooth compression action at the time of starting the compressor.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been invented to achieve the above object, and the first invention is a fixed scroll member and an orbiting scroll member for upstanding a spiral wrap on a disk-shaped end plate. Is equipped with a back pressure chamber defined by an orbiting scroll member and a frame for fixing the fixed scroll member, with the wraps being engaged with each other, and the gas pressure deriving pores for guiding gas to the back pressure chamber are fixed scrolls. Provided on the end plate portion of the member or the end plate portion of the orbiting scroll member, the orbiting scroll member is orbitally moved with respect to the fixed scroll member without rotating, and the fixed scroll member has a discharge port opening at the center and an intake opening at the outer periphery. A port is provided, gas is sucked in through the suction port, and the gas is compressed by moving it around the closed space formed by both scroll members to reduce the volume,
A device for discharging a compressed gas from a discharge port, wherein a scroll fluid machine equipped with a liquid refrigerant injection mechanism for cooling a working gas in an end plate portion of a fixed scroll member, a fixed scroll member serving as a liquid refrigerant injection mechanism for cooling a working gas. The end face of the orbiting scroll member is provided with a liquid refrigerant injecting fine hole, the fine hole is opened facing the wrap tooth tip surface of the orbiting scroll member, and the opening of the fine hole is connected to the closed space. The gas pressure deriving pores and the gas pressure deriving pores are represented by the following formulas so that the gas pressure deriving pores are in a positional relationship of intermittently communicating with each other through the closed space by the swirling motion. It is set to the position.

[0006]

## EQU1 ## λ _b > λ _in > λ _b -2π (1) where, λ _in : scroll wrap winding angle (rad) at the position of the liquid refrigerant injecting fine hole λ _b : gas pressure deriving fine hole Scroll wrap winding angle at a position (rad) π: Circular ratio Further, the second invention provides a fixed scroll member and an orbiting scroll member for uprightizing a spiral wrap on a disk-shaped end plate,
The wraps are engaged with each other inside, and the orbiting scroll member is orbitally moved with respect to the fixed scroll member without rotating, and the fixed scroll member is provided with a discharge port opening in the center and an intake port opening in the outer peripheral part. A device that sucks gas from the mouth, moves it around the enclosed space formed by both scroll members to reduce the volume, compresses the gas, and discharges the compressed gas from the discharge port, a liquid refrigerant for cooling the working gas. In a scroll fluid machine provided with an injection mechanism in the end plate portion of the fixed scroll member, a liquid refrigerant injection fine hole is provided in the end plate portion of the fixed scroll member as a liquid refrigerant injection mechanism for cooling the working gas, and the fine hole is Although the opening of the orbiting scroll member faces the wrap tooth tip surface and the opening of the pore is connected to the closed space, it is fixed by the orbiting motion of the orbiting scroll member. As the discharge port side and intermittently communicating position of the wrap central portion of the seal member, it is characterized in that provided in the position shown the liquid refrigerant injection pores by the following equation.

[0007]

## EQU2 ## λ _in <λ _s + 2π (2) where λ _s : scroll wrap winding start end P,
The scroll wrap winding angle (rad) at the position of P ′ Further, the third invention is a liquid refrigerant provided on the end plate portion of the fixed scroll member as a combination of compressor structures satisfying the above formulas (1) and (2). The injection pores have a positional relationship with the discharge port side of the wrap center of the fixed scroll member and the gas pressure derivation pores so as to intermittently communicate with each other through the closed space by the orbiting movement of the orbiting scroll member. In addition, the liquid refrigerant injecting pores and the gas pressure deriving pores are provided at the positions represented by the following formulas.

[0008]

## EQU00003 ## λ _s + 2π> λ _in > λ _b -2π (3) The scroll wrap winding angle means the expansion angle of the scroll wrap when the shape of the scroll wrap is an involute curve.

[0009]

The operation of the present invention will be described with reference to the drawings.

In FIG. 2, injection pores 139 (139a, 139) serving as a liquid refrigerant injection portion for cooling the working gas.
In b), the orbiting scroll member 105 is opened so as to face the wrap tooth front surface, and the opening of the fine hole 139 starts from the position of the gas pressure deriving fine hole 124 (124a, 124b). Toward (the lap start points P, P ′ in FIG. 4)
(Toward the position of), the position is set to one or more turns. For this reason, as shown in FIG.
a and the gas pressure derivation pores 124a communicate with each other through the sealed space 121a, while the liquid refrigerant injection pores 139b and the gas pressure derivation pores 124b communicate with each other through the sealed space 121b. . The gas pressure derivation pore 124 is connected to the back pressure chamber 123 on the back surface of the orbiting scroll member 105 by a pipe 125.

With such a structure, the liquid refrigerant injected into the closed spaces 121a and 121b for cooling the working gas has the gas pressure derivation pores 124 (124a and 124).
It can be released from b) to the back pressure chamber 123 side through the pipe 125. When the gas pressure derivation pores 124 are provided in the end plate portion 105a of the orbiting scroll member 105, the liquid refrigerant inside the sealed spaces 121a and 121b directly passes through the gas pressure derivation pores 124. It can be released to the back pressure chamber 123 side. The meaning of the above-mentioned formula (1) means that the liquid refrigerant injecting pores 139 (139a, 139b) must be provided at least once through the sealed spaces 121a, 121b during one orbiting motion of the orbiting scroll member 105. And the gas pressure derivation pores 124 (124a, 124b) are in communication with each other.

Next, the second invention will be described with reference to FIG. The fine holes 141 (141a, 141b) for injecting the liquid refrigerant are the wraps 10 of the end plate portion 101a of the fixed scroll member 101.
It is provided at a position on the outer bottom surface of the wrap tooth that is less than one turn from the winding start ends P and P'of 1b toward the winding direction of the scroll wrap. Due to this structure, a part of the liquid refrigerant injected from the liquid refrigerant injection pores is used as the orbiting scroll member 1.
By the turning motion of 05, the fixed scroll member can be moved to the discharge port 102 side in the central portion of the wrap. In this way, the liquid refrigerant injected from the injection pores intermittently flows to the discharge port, and the amount of the liquid refrigerant left in the sealed spaces 121a and 121b is reduced accordingly. It is possible to avoid the liquid compression action as much as possible at the time of starting.

A third invention in which a compressor structure satisfying the above formulas (1) and (2) is combined will be described with reference to FIG. The liquid refrigerant injecting pores 142 (142a, 142b) provided in the end plate portion 101a of the fixed scroll member 101 are
Discharge port 10 at the center of the wrap of the fixed scroll member 101
The second side and the gas pressure derivation pores 143 (143a, 143b) are in a positional relationship of intermittently communicating with each other through the closed spaces 121a, 121b by the orbiting movement of the orbiting scroll member 105. The liquid refrigerant injected from the pores intermittently flows to the discharge port side and can move to the back pressure chamber side through the gas pressure derivation pores connected to the closed space. Therefore, it is possible to completely avoid the liquid refrigerant compression action at the time of start-up described above, and it is possible to greatly improve the reliability of the scroll fluid machine.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a scroll fluid machine having a liquid refrigerant injection mechanism will be described below with reference to FIGS.

FIG. 1 shows a horizontal refrigeration / air-conditioning scroll compressor in which the fixed scroll side of the scroll compressor is exposed to the atmosphere and the crankshaft is laterally arranged, and its refrigerant circuit. The fixed scroll member 101 and the orbiting scroll member 105 are engaged with each other with the wrap portions facing inward, and the orbiting scroll member 105 is housed between the fixed scroll member 101 and the claim 106 that fixes the fixed scroll member 101. A frame 106 is provided on the back of the end plate 105a of the orbiting scroll member 105.
The back pressure chamber 123 is formed in the recess.

A rotating shaft 107 supported by a frame 106
Has an eccentric shaft 107a formed at its tip, and the eccentric shaft 107a
Engages with the boss 105c of the orbiting scroll member.
Reference numeral 108 denotes an Oldham mechanism, which is an orbiting scroll member 105.
The eccentric rotation of the eccentric shaft 107a causes the fixed scroll member 101 to orbit through the Oldham mechanism 108.

By the swiveling motion, the closed space 121 formed by both scroll members gradually moves to the center and the volume thereof decreases.

Gas is introduced into the suction chamber 1 through the suction port 103 at the outer peripheral portion.
22 and is discharged from the central discharge port 102.

The back pressure chamber 123 and the closed space 121 in the compression process
Is the small holes 124a, 124b formed in the end plate 101a,
It is connected through a pipe 125 and an intermediate pressure in the compression process is introduced into the back pressure chamber 123 to obtain an axial pressing force.

A discharge pipe 131 is connected to the discharge port 102, the other end is connected to a condenser 182, and a pipe 183 connected to the outlet side of the condenser 182 is connected to an evaporator 185 via an expansion valve 184. The outlet side of the evaporator is a suction pipe 164
Is connected to the suction port 103.

A liquid injection pipe 135 is branched from the inflow side pipe of the expansion valve 184, and the pressure reducer 13 is connected to the pipe 135.
7, and the other end is connected to liquid injection fine holes 139a and 139b formed in the end plate 101a of the fixed scroll.
It communicates with the enclosed space. In the figure, the solid line arrow indicates the flow direction of the refrigerant gas, and the broken line arrow indicates the flow direction of the liquid refrigerant.

In the case of a compressor for refrigeration and air conditioning, the discharge pressure P _d
And the suction pressure P _s , that is, the operating pressure ratio Pd / P _s is 7 to
It may be 10 and abnormally large. In this case, the discharge gas temperature of the refrigerant rises to about 120 ° C. to 150 ° C., the liquid refrigerant is decompressed through the illustrated liquid injection pipe 135, and then injected into the closed space to cool the working gas.

However, when the compressor is stopped, in the prior art, a large amount of liquid refrigerant flows into the closed space 121 through the liquid injection pipe 135, and the liquid refrigerant flows in the closed space 12.
It accumulates in 1. If you restart the compressor in this state,
As described above, the liquid refrigerant in the closed space is compressed.

For this reason, in this embodiment, the liquid injection fine holes 139a, 139b and the gas pressure deriving fine holes 124a, 1 described above are used.
By providing 24b in the positional relationship described below,
The liquid refrigerant injected into the closed space is released to another pressure chamber to remove or reduce liquid compression.

FIG. 2 shows a cross section of both scroll members in a meshed state.

The gas pressure deriving pores 124a, 124b
And the liquid injecting pores 139a and 139b are provided in a positional relationship such that they are intermittently connected to each other through the sealed spaces 121a and 121b formed by the scroll members. Each of the pores is provided in the end plate portion along the side wall of the scroll wrap.

That is, if the liquid injection fine pores 139a, 139b are provided within one roll from the gas pressure deriving fine pores 124a, 124b toward the beginning of the wrap (toward the central portion of the lap), as shown in the drawing. So that the pores 139a, 139b and 1
24a and 124b are formed intermittently, that is, so as to communicate with each other through the closed space at least once during one orbit of the orbiting scroll member. The above positional relationship is expressed as follows.

[0028]

Λ _b > λ _in > λ _b −2π (4) where λ _in is the scroll wrap winding angle (rad) at the liquid refrigerant injection fine hole position λ _{b is the} gas pressure deriving fine hole position Scroll wrap winding angle (rad) π: Circumferential ratio Incidentally, the hole diameters of the liquid refrigerant injecting pores 139a and 139b and the gas pressure deriving pores 124a and 124b may be set to values smaller than the lap thickness in practical use. desirable.

In the drawing, a liquid refrigerant injection fine hole 139.
The positions of a and 139b are λ _in ≈8.0 rad as the scroll wrap winding angle. Further, the gas pressure derivation pores 12
The positions of 4a and 124b are positions of λ _b ≈12.0 rad as the scroll wrap winding angle, which satisfies the above formula (4).

By setting the pores for injecting the liquid refrigerant and the pores for deriving the gas pressure as described above, the liquid refrigerant filled in the closed space 121 at the time of stop or start is used for introducing the gas pressure. The pores 124a and 124b are intermittently communicated with each other and easily escape to the back pressure chamber 123.

The above equation (4) can be replaced by the following equation.

[0032]

Λ _in = λ _b (5) where λ _in is the scroll wrap winding angle (rad) at the position of the liquid refrigerant injection pores λ _b is the scroll wrap winding angle at the gas pressure deriving pores (Rad) In the above equation, the liquid refrigerant injecting pores and the gas pressure deriving pores are in constant communication with each other through the sealed space. The above configuration is most effective in the function of preventing or mitigating liquid compression.

FIG. 3 shows the acupressure diagram (P-.lamda. Diagram) at the initial stage of starting the scroll compressor in the case of this embodiment (solid line) and in the case where there is no escape passage for liquid refrigerant (conventional machine). It is shown in comparison with the one-dot chain line).

The horizontal axis indicates the scroll wrap winding angle λ instead of the volume V. (λ _s is the scroll wrap winding start angle, and λ _e is the scroll wrap winding end angle.) In the case of the conventional machine, since the incompressible liquid refrigerant is tried to be compressed, the pressure inside the scroll is the discharge pressure. P _d
An abnormal hydraulic pressure P _max that greatly exceeds the above is applied, but in the case of the present embodiment, the gas pressure derivation pores 124a, 1a.
24b is a liquid refrigerant injection fine hole 139a, 1 through the closed space.
Since it is communicated with 39b intermittently, the closed space 121
a and 121b are not completely enclosed spaces, and form a compression working chamber with an open outlet. Therefore, the liquid pressure P
_The liquid refrigerant moves to the back pressure chamber 123 whose pressure level is lower than _max , and the pressure in the sealed spaces 121a and 121b decreases. Of course, the pressure P _b in the back pressure chamber 123 becomes a relationship of P _b << P _max with respect to the liquid pressure P _max. Since the area surrounded by the acupressure diagram is proportional to the required power of the compressor, according to the present embodiment, abnormal pressure rise in the sealed space due to liquid compression is prevented, and power consumption is reduced at the moment of startup. (Reduction of starting torque) can be achieved.

In the above embodiment, the gas pressure derivation pores 124a and 124b are provided in the end plate 101 of the fixed scroll member.
Although it is provided at a, it may be provided at a position corresponding to the end plate of the orbiting scroll member.

Further, liquid refrigerant injection fine holes 139a, 139
b and the gas pressure derivation pores 124a and 124b,
A pair (two pieces) are provided at positions symmetrical in terms of pressure,
Practically, even if each one of the above-mentioned fine pores is provided, the same effect can be obtained.

FIG. 4 is a sectional view showing another embodiment of the positional relationship of the pores and showing the meshing state of the scroll wrap.

In this embodiment, the liquid refrigerant injection pores 141 are provided.
a and 141b are drilled at a position within one turn from the winding start end of the scroll wrap and along the side wall of the end plate of the fixed scroll wrap so that the liquid refrigerant injection sealed space is intermittently communicated with the discharge space 102. It was formed in.

The position of the pores for liquid injection is shown by the following equation.

[0040]

## EQU6 ## λ _in <λ _s + 2π (6) where λ _in : scroll wrap winding angle (rad) at the position of the liquid refrigerant injection pores λ _s : scroll wrap winding start angle (rad) π: circle Periphery With the above structure, the liquid refrigerant injected into the closed space is intermittently injected into the discharge space 102, the amount of the liquid refrigerant injected into the closed space is reduced, and decompression can be avoided.

The above-mentioned liquid injection fine pores 141a, 141b.
The space that is open to and intermittently communicates with the discharge space is a space that can also be a discharge space due to the closed spaces 121a and 121b in the compression process or the orbiting movement of the orbiting scroll.

In the above equation (6), practically, the liquid refrigerant injecting pores 141a and 141b are

[0043]

[Equation 7]

The positional relationship of is considered to be preferable. Figure 5
Is an acupressure diagram (P in an ideal case) showing the relationship between the pressure inside the scroll of this embodiment and the scroll wrap winding angle.
-Λ diagram) is shown. In the figure, λ _q represents the scroll wrap winding angle at the first positions Q and Q ′ from the scroll wrap winding start portions P and P ′ shown in FIG. 4 toward the outside of the wrap. Therefore, according to FIG. 5, the liquid refrigerant injecting period during the discharge process, in other words, the period in which the discharge port and the liquid refrigerant injecting pores 141a and 141b communicate with each other through the closed space in the discharge process, is shown in FIG. When expressed, the contact section is expressed by the following equation.

[0045]

[Formula 8] Δλ _d = λ _q −λ _in (8) where Δλ _d is the contact range (rad) on the scroll wrap winding angle that becomes the liquid refrigerant injection section during the discharge stroke λ _in : For the liquid refrigerant injection Scroll wrap winding angle (rad) λ _{q at} the position of the fine pores: contact point Q of both scrolls at the instant when the discharge stroke is completed,
When the scroll wrap winding angle (rad) at the position of Q ′ is compared with the above equations (7) and (8), Δλ _d is Δλ _d =
The value is (λ / 6 to λ / 4). Therefore, during one rotation of the main shaft, the liquid refrigerant injection pores are intermittently communicated with the discharge space within the range of the rotation angle of Δλ _d (rad).

FIG. 6 shows still another embodiment, in which the positional relationship between the liquid refrigerant injecting pores and the gas pressure deriving pores is set to a position where the above-described embodiments of FIGS. 2 and 4 are combined. It corresponds to the embodiment.

When the liquid refrigerant injecting holes 142a and 142b are formed at positions along the wrap within one turn from the winding start end of the scroll wrap, the gas outlet hole 143 is obtained.
The holes a and 143b are drilled from the positions of the liquid refrigerant injection fine holes 142a and 142b toward the winding end (outer side) of the wrap along the wrap within one wrap.

The above positional relationship is expressed by the following equation.

[0049]

Λ _s + 2π> λ _in > λ _b −2π (9) where λ _in : scroll wrap winding angle (rad) at the position of the liquid refrigerant injection pores λ _s : scroll wrap winding start angle (rad) ) Λ _b : Scroll wrap winding angle (rad) at the position of the gas pressure derivation pores π: Circumferential ratio By configuring each pore in the above positional relationship, for injecting the liquid refrigerant into the closed space Pores 142a, 142
b intermittently communicates with the discharge space, and the pores 142
The a and 142b can also intermittently communicate with the gas pressure derivation pores 143a and 143b through the sealed spaces 121a and 121b.

As described above, since the injected liquid refrigerant intermittently flows into the discharge space and the back pressure chamber, liquid compression is prevented and abnormal pressure rise in the sealed space is prevented.

The illustrated pores 142a, 142b, 1
Specific numerical values of the positional relationship between 43a and 143b are

[0052]

## EQU10 ## λ _s ≈1.1 rad λ _q ≈7.4 rad λ _in ≈6.8 rad λ _b ≈12.5 rad (10), which satisfies the above equation (9).

Further, as can be seen from the equation (9), the positions of the liquid refrigerant injecting holes 142a and 142b are set inside the lap with respect to the gas pressure deriving holes 143a and 143b. This is to prevent excessive cooling action by reducing the liquid refrigerant injection amount by minimizing the differential pressure between the high pressure discharge pressure and the internal pressure of the closed space where the liquid refrigerant injection pores are opened. is there.

FIG. 7 shows an embodiment of a scroll compressor having still another structure. This compressor is a low pressure chamber type vertical hermetic scroll compressor in which the inside of the hermetic container is mainly in the atmosphere of suction pressure. is there.

In the hermetic container 200, the compressor part composed of the fixed scroll part 201 and the orbiting scroll member 205 is arranged in the upper part, the electric motor part 259 is arranged in the lower part, and the rotary shaft 257 is arranged.
The compressor unit and the electric motor unit are connected to each other via the.

The rotating shaft 257 is supported by a main bearing 262 provided on the frame 256, a lower bearing 263 provided on the bottom wall, and an eccentric bearing 2 provided eccentrically on the upper part of the main shaft.
An orbiting shaft 257a of an orbiting scroll member is supported by 61. 262a is a thrust bearing (rolling bearing),
The gas force generated in the closed space (compression chamber) of the compressor section is supported by the bearing. 258 is an Oldham mechanism, 264 is a suction pipe, 274 is a discharge pipe, and 278 is a liquid refrigerant injection pipe. Two
67 is an intermediate pressure chamber formed by a partition wall 267a at the back of the fixed scroll, which is a closed space 221 in the compression process.
And the pores 268 communicate with each other to form a preliminary pressure chamber. In the figure, the solid line arrow indicates the flow direction of the refrigerant gas, and the broken line arrow indicates the flow direction of the liquid refrigerant.

The refrigerant gas is introduced through the suction pipe 264,
It reaches the electric motor space of the hermetic container 200, cools the electric motor and becomes an upward flow, and the suction hole 256 provided in the frame 256.
After a, it is sucked into the suction chamber 222 at the outer peripheral portion of the scroll compressor. Next, the orbiting scroll member moves to the center by the orbiting motion, is compressed, is cooled by the injecting liquid refrigerant described below, and is discharged from the discharge port 266 in the upper portion of the sealed container 271.
Is discharged.

Then, it is delivered to the outside of the machine (condenser) via the discharge pipe 274.

On the other hand, the liquid refrigerant supplied from the liquid refrigerant injection pipe 278 is injected into the closed space 221 through the fine holes 269 to cool the working gas.

In this embodiment, one liquid refrigerant injection fine hole 269 is provided on the end plate, and the fine hole 269 is different from the gas pressure deriving fine hole 268 as shown in the above equation (4). It is formed in such a positional relationship that it intermittently communicates with the gas pressure deriving pores 268 via a closed space.
Intermediate pressure chamber 267 in which the gas pressure derivation pore 268 is opened
With the above configuration, the liquid refrigerant is intermittently injected at the time of liquid compression, such as in the initial stage of activation, and serves as an escape space for the liquid refrigerant.

The positional relationship between the liquid refrigerant injecting pores and the gas pressure deriving pores may be set to the positional relationship shown in the above equation (5) or (9).

[0062]

As described above, according to the present invention, the following effects can be obtained.

(1) A large amount of the cooling liquid refrigerant is injected and filled in the closed space formed by both scroll members immediately before the compressor is stopped and when the compressor is started, and liquid compression is not caused.

(2) In connection with the above item (1), it is possible to prevent the accident of the scroll wrap from being broken and the phenomenon of poor starting, which have been found in the conventional machine, and to reduce the power at the time of starting. The reliability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a scroll fluid machine showing an embodiment of the present invention and a diagram showing a refrigeration cycle refrigerant circuit.

FIG. 2 is a cross-sectional view of the scroll wrap of the embodiment of FIG. 1 in a meshed state.

FIG. 3 is an acupressure diagram (P-λ diagram) showing changes in pressure in the closed space of the embodiment of FIG. 2.

FIG. 4 is a cross-sectional view of a scroll wrap according to another embodiment in a meshed state.

FIG. 5 is an acupressure diagram showing pressure changes in the closed space of the embodiment of FIG.

FIG. 6 is a cross-sectional view in a meshed state of a scroll wrap showing still another embodiment.

FIG. 7 is a vertical cross-sectional view of a low pressure container type sealed scroll fluid machine showing still another embodiment.

[Explanation of symbols]

101 ... Fixed scroll member, 105 ... Orbiting scroll member, 122 ... Suction chamber, 121 (121a, 121b)
... Closed space, 141 ... Pore for injecting liquid refrigerant, 102 ... Discharge port, 124 (124a, 124b) ... Pore for deriving gas pressure.

Claims (4)

[Claims] 1. A fixed scroll member (101) and an orbiting scroll member (10) for vertically standing a spiral wrap (101b, 105b) on a disk-shaped end plate (101a, 105a).
5) is equipped with a back pressure chamber (123) which is meshed with the wraps inside each other and is defined by the orbiting scroll member and the frame (106) for fixing the fixed scroll member (101). Gas pressure derivation pores 124a for guiding the
124b is provided on the end plate portion (101a) of the fixed scroll member or the end plate portion (105a) of the orbiting scroll member, and the orbiting scroll member is orbitally moved with respect to the fixed scroll member without rotating, and the fixed scroll member is opened at the center. A discharge port (102) and a suction port (103) that opens to the outer periphery are provided, and gas is suctioned from the suction port.
Closed space formed by both scroll members (121, 12
1a, 121b) to reduce the volume to compress the gas and discharge the compressed gas from the discharge port. A scroll provided with a liquid refrigerant injection mechanism for cooling the working gas in the end plate portion of the fixed scroll member. In a fluid machine, as a liquid refrigerant injection mechanism for cooling a working gas, a liquid refrigerant injection hole (139a, 139b) is formed in an end plate portion of a fixed scroll member.
And the pores are opened so as to face the wrap tooth tip surface of the orbiting scroll member, and the gas pressure derivation is performed by the orbiting motion of the orbiting scroll member (105) even though the opening portion of the pores is connected to the closed space. The liquid refrigerant injecting pores and the gas pressure deriving pores are provided at the positions shown by the following formulas so that the pores and the pores are in intermittent communication with each other through a closed space. And scroll fluid machinery. [lambda] _b > [lambda] _in > [lambda] _{b-2 [} pi] where [lambda] _in : scroll wrap winding angle (rad) at the position of the liquid refrigerant injection pores [lambda] _b : scroll wrap winding angle (rad at the gas pressure deriving pores). ) Π: Pi 2. A fixed scroll member (101) and an orbiting scroll member (10) for vertically setting a spiral wrap (101b, 105b) on a disk-shaped end plate (101a, 105a).
5) are engaged with each other with the wraps inward, and the orbiting scroll member is orbitally moved with respect to the fixed scroll member without rotating, and the fixed scroll member has a discharge port (102) opening in the central portion and an opening in the outer peripheral portion. Intake port (10
3) is provided, gas is sucked through the suction port, and a closed space (121, 121a, 12) formed by both scroll members is provided.
1b) to move around to reduce the volume and compress the gas,
A device for discharging a compressed gas from a discharge port, wherein a scroll fluid machine equipped with a liquid refrigerant injection mechanism for cooling a working gas in an end plate portion of a fixed scroll member, a fixed scroll member serving as a liquid refrigerant injection mechanism for cooling a working gas. Is provided with liquid refrigerant injecting fine pores (141a, 141b), the fine pores are opened to face the wrap tooth front surface of the orbiting scroll member, and the fine pores are connected to the closed space. The liquid refrigerant injecting pores are provided at the positions shown by the following formulas so that the orbiting scroll member is in a position where it intermittently communicates with the discharge port side of the wrap center of the fixed scroll member by the orbiting motion of the orbiting scroll member. Characteristic scroll fluid machine. λ _in <λ _s + 2π where λ _s : scroll wrap winding start end (P,
P ') position scroll wrap winding angle (ra
d) 3. An opening portion of a liquid refrigerant injection fine hole is intermittently communicated with a discharge port side of a lap center portion of a fixed scroll member in a communication angle range Δλ _d represented by the following formula by the orbiting motion of the orbiting scroll member. The scroll fluid machine according to claim 2, wherein the liquid refrigerant injecting pores are provided at positions indicated by the following formulas so as to have a positional relationship. λ _in ≈λ _s + 2π−Δλ _d where λλ _d : angular range of λ / 6 or λ / 4 (ra
d) 4. The liquid refrigerant injecting pores (142a, 142b) provided in the end plate portion of the fixed scroll member, the discharge port side of the central portion of the lap of the fixed scroll member and the gas pressure deriving hole (143a, 143b). On the other hand, the positions of the liquid refrigerant injecting fine holes and the gas pressure deriving fine holes are downward so that the orbiting scroll member (105) has a positional relationship in which the orbiting scroll member (105) communicates intermittently through the closed space. The scroll fluid machine according to claim 2, wherein the scroll fluid machine is provided at a position represented by a formula. λ _s + 2π> λ _in -2π