JP2533732B2 - Refrigeration equipment using scroll fluid machinery - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A conventional scroll fluid machine is used.
Examples of the refrigeration system, first of JP Utility Model 56-85087
As shown in FIG. 11 , in order to cool the working gas, the condenser space is provided in the compression space formed by both scroll members .
A structure is shown in which the liquid refrigerant is injected from the outlet side .

[0003]

In the above-mentioned conventional example, the incompressible liquid refrigerant injected is filled in the closed space, especially when the compressor is started up or immediately before it is stopped, and the compressed space is compressed. As a result, liquid compression may occur, resulting in damage to the scroll wrap. Alternatively, even if the liquid compression is not achieved, the pressure in the sealed space abnormally rises, the orbiting scroll member separates from the fixed scroll member, and does not perform a compression action, which causes a problem such as start failure.

An object of the present invention, as well as to cool the working gas by injecting liquid refrigerant into the sealed space formed by both scroll members, capable of preventing an abnormal pressure increase inside the liquid compression or enclosed space sucrose − Refrigeration equipment using fluid machinery
It is to get a table .

[0005]

To formed the object reaches Means for Solving the Problems] The first aspect of the present invention, the spiral wrap on the end plate directly
Standing fixed scroll member and orbiting scroll member,
Fixed scroll part
The frame for fixing the material and the end plate of the orbiting scroll member
And a back pressure chamber configured by
The dense member formed by the roll member and the orbiting scroll member.
The gas pressure derivation pores that guide the gas under compression from the closed space are fixed.
End plate part of constant scroll member or swivel scroll member
It is installed on the end plate part of the
The fixed scroll member is swung to the fixed scroll member.
The roll member has a discharge port that opens in the center and an opening in the outer periphery.
A suction port is provided, and gas is sucked in through the suction port.
The volume is moved around the enclosed space formed by the roll members.
To compress the gas and discharge the compressed gas from the discharge port.
Scroll fluid machine and the suction of the scroll fluid machine.
An evaporator connected to the inlet side of the scroll fluid machine
A condenser connected to the discharge side, the outlet side of the condenser and the
It is equipped with an expansion valve installed in the pipe between the suction side of the evaporator and
In a refrigerating device that constitutes a freezing cycle,
It faces the wrap tooth tip of the roll member and opens in the enclosed space.
Penetrate the end plate of the fixed scroll member
And due to the turning movement of the turning scroll member,
Through the space formed by both scroll members,
The gas pressure so that it communicates intermittently with the gas pressure derivation pores.
Raise from the position of the lead-out hole toward the winding start side of the wrap.
Liquid for cooling the working gas provided within one roll
A refrigerant injection hole is provided to connect the condenser and expansion valve.
Using a liquid injection pipe for the pipe and the liquid refrigerant injection pores.
To establish a pressure reducer in the liquid injection pipe.
is there.

A second feature of the present invention is that the end plate is swirled.
-Shaped wrap upright fixed scroll member and revolving disc
Engage the roll members with the wraps inside each other and engage
Fixed scroll part without rotating the scroll member
The material is swiveled, and the fixed scroll member has a central part.
A suction port that opens to the outside and a suction port that opens to the outer periphery are provided.
Gas is taken in through the inlet and formed by both scroll members.
It moves around the enclosed space to reduce the volume and pressurize the gas.
A scroll flow that contracts and discharges compressed gas from the discharge port.
Connected to the body machine and the suction side of the scroll fluid machine.
Connected to the evaporator and the discharge side of the scroll fluid machine.
Condenser, outlet side of the condenser and suction side of the evaporator
And the expansion valve provided in the pipe between
In the refrigerating apparatus thus constructed, the lathe of the swivel scroll member is
Opposed to face the tooth tip surface and open in the enclosed space
It is provided by penetrating the end plate of the fixed scroll member.
By the turning movement of the turning scroll member,
Through the space formed by the roll member,
Make sure that only the outlet of the roll member communicates intermittently.
Roll from the start of the wrap to the outer surface of the wrap.
Within one roll and outside the fixed scroll wrap
Liquid cooling for working gas cooling provided in a position close to the peripheral surface
A pore for medium injection is provided to connect the condenser and the expansion valve.
Pipe and the liquid refrigerant injection pores using the liquid injection pipe
There is a decompressor installed in the liquid injection pipe for communication.
It

[0007]

The above-mentioned scroll fluid machine of the present invention is used.
The refrigerating device has the following effects. (1) The opening position of the liquid refrigerant injection pores for cooling the working gas is intermittently communicated with the gas pressure derivation pores through the closed space by the swirling motion of the swirl scroll member. In the case where it is provided within one wrap from the position of the gas pressure derivation pores toward the winding start side of the wrap, the refrigerant injection pores and the gas pressure derivation pores are swirl scrolled. Of 1
It is possible to communicate once every time through the closed space during rotation, so when the incompressible liquid refrigerant injected is filled in the closed space at the time of starting or just before stopping the compressor. However, when the liquid refrigerant in the closed space communicates with the gas pressure derivation pores during one revolution of the swirl scroll, it is discharged into the back pressure chamber through the gas pressure derivation pores, and as a result, the liquid refrigerant is discharged. It is possible to cool the working gas by injecting the liquid refrigerant into the closed space formed by both scroll members while preventing compression and abnormal pressure rise inside the closed space.

(2) The position of the opening of the fine hole for injecting the liquid refrigerant is intermittently communicated only with the discharge port of the fixed scroll member by the swirling motion of the swirl scroll member. With the scroll provided at a position within one turn from the winding start end along the outer peripheral surface of the wrap and at a position close to the outer peripheral surface of the fixed scroll wrap, the refrigerant injection fine hole and the discharge port are swirl scrolled. -If the incompressible liquid refrigerant is filled in the sealed space at the time of starting or just before stopping the compressor, it is possible to make sure that it can be communicated once during one rotation of the compressor. However, the liquid refrigerant in this closed space is discharged to this discharge port when communicating with the discharge port during one rotation of the swirl scroll, and as a result, liquid compression and abnormal pressure rise inside the closed space are prevented, Liquid in the enclosed space formed by both scroll members It can be by injecting a medium to cool the working gas.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. ◆ FIG. 1 shows a refrigeration system using a horizontal scroll compressor whose fixed scroll side is exposed to the atmosphere and whose crankshaft is laterally arranged.

The fixed scroll member 101 and the orbiting scroll member 105 are intermeshed with each other with their lap portions facing inward, and the orbiting scroll member 105 is disposed between the fixed scroll member 101 and the frame 106 for fixing the fixed scroll member 101. A back pressure chamber 123 is formed in a recess of the frame 106 at the back of the end plate 105a of the orbiting scroll member 105.

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.
108 is the Oldham mechanism, and the orbiting scroll member 105 is
By the eccentric rotation of the eccentric shaft 107a, the Oldham mechanism 1
The orbiting motion is performed on the fixed scroll member 101 via 08.

By the swiveling motion, the enclosed 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.

Further, a liquid refrigerant injection pipe (hereinafter abbreviated as liquid injection pipe) 135 is branched from the inflow side pipe of the expansion valve 184, a pressure reducer 137 is interposed in the pipe 135, and the other end is a fixed scroll. It is connected to liquid refrigerant injection fine holes (hereinafter abbreviated as liquid injection fine holes) 139a and 139b formed in the end plate 101a and communicates with the closed 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 P _d / P _s is 7 to
It may be 10 and abnormally large. In this case, the discharge gas temperature of the refrigerant becomes as high as 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 sealed space 121 through the liquid injection pipe 135, and the liquid refrigerant flows into the sealed space 1.
It collects in 21. When the compressor is restarted in this state, the liquid refrigerant in the closed space is compressed as described above.

Therefore, in the present embodiment, the liquid injection fine holes 139a and 139b and the gas pressure deriving fine holes 124a and 1 described above are used.
By providing 24b in the positional relationship described below,
The liquid refrigerant injected into the closed space is escaped to another pressure chamber (closed space) via the back pressure chamber 123 to remove or reduce the liquid compression.

In FIG. 2, both scroll members are engaged with each other.
It is a cross-sectional view showing a state . ◆ Pore for derivation of gas pressure 1
24a, 124b and liquid injection fine pores 139a, 139b are formed in both scroll members in a sealed space 121a, 1
The holes are formed in such a positional relationship that they are intermittently connected via 21b. 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 holes 139a and 139b are provided within one turn toward the lap winding start portion (lap central portion) from the gas pressure derivation fine holes 124a and 124b, as shown in the figure. , The pores 139a, 139b and 12
4a and 124b are formed intermittently, that is, so as to communicate with each other at least once during one orbit of the orbiting scroll member via the closed space. The above positional relationship is expressed as follows.

Λ _b > λ _in > λ _b −2π (1) where λ _in : scroll wrap winding angle (rad) at liquid coolant injection fine hole position λ _b : scroll at gas pressure deriving fine hole position Lap winding angle (rad) π: circular constant.

The liquid refrigerant injection fine holes 139a and 139 are provided.
b and the pore diameters of the gas pressure derivation pores 124a and 124b are
Practically, it is desirable to set the value smaller than the lap thickness.

In the embodiment shown in this figure, the positions of the liquid refrigerant injection fine holes 139a and 139b are λ _in ≉8.0 rad as the scroll wrap winding angle. Further, the positions of the gas pressure derivation fine holes 124a and 124b are positions where the scroll wrap winding angle is λ _b ≈12.0 rad,
The above expression (1) is satisfied.

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 sealed space 121 at the time of stop or start is used for the gas pressure deriving. The pores 124a and 124b are intermittently communicated with each other and easily escape to the back pressure chamber 123.

Next, the operation of the above embodiment will be described.
With the above-described structure, when the swirl scroll rotates and the positional relationship with the fixed scroll becomes as shown in FIG. 2, the liquid refrigerant injecting pores 139a and the gas pressure deriving pores 1a.
24a communicates with each other through the sealed space 121a, and the liquid refrigerant injecting pores 139b and the gas pressure deriving pores 124b communicate with each other through the sealed space 121b. As a result, the gas pressure derivation pores communicate with the back pressure chamber 123 on the back surface of the orbiting scroll member 105 via the pipe 125.

Therefore, the liquid refrigerant injected into the closed spaces 121a and 121b for cooling the working gas escapes from the gas pressure derivation fine holes 124a and 124b to the back pressure chamber 123 side through the pipe 125. be able to.

When the gas pressure deriving hole is provided in the end plate portion 105a of the orbiting scroll member 105, the liquid refrigerant inside the closed spaces 121a and 121b directly flows through the gas pressure deriving hole 124. It can be escaped to the back pressure chamber 123 side through.

The meaning of the above equation (1) means that during one orbiting movement of the orbiting scroll member 105, the liquid refrigerant injecting pores 139a and 139b must be provided at least once through the closed spaces 121a and 121b. And gas pressure deriving pore 12
4a and 124b are in communication with each other. That is, in the scroll compressor, the contact points of the wraps of the swirling and fixed scrolls that form the closed space are exactly one turn (2π) between the discharge side contact and the suction side contact at the wrap winding angle. ), The position of the liquid injection pore is set to 1 with respect to the gas pressure derivation pore.
By setting the number of turns within (2π), these pores are surely communicated once through the sealed space during one rotation of the orbiting scroll (2π).

Further, instead of the equation (1), the following equation may be used. ◆ λ _in = λ _b (2) where, λ _in : scroll wrap winding angle at the position of the liquid refrigerant injection pores (rad) λ _b : scroll wrap winding angle at the gas pressure deriving pores (rad) ).

The above expression (2) means that the liquid refrigerant injecting pores and the gas pressure deriving pores are always in 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-λ diagram) at the initial stage of starting the scroll compressor in the case of the present embodiment (solid line) and in the case where there is no liquid refrigerant escape passage (conventional device) ( It is a figure which compares with a dashed-dotted line) and shows.

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
An abnormal hydraulic pressure P _max that greatly exceeds _d acts, but in the case of this embodiment, the gas pressure derivation pores 124a, 1
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 closed space due to liquid compression is prevented, so that power reduction at the moment of starting (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.

Another embodiment of the present invention will be described with reference to FIGS.

The embodiment shown in FIG. 4 has a pore 1 for injecting a liquid refrigerant.
41a and 141b are drilled at a position within one winding from the winding start ends P and P'of the scroll wrap and along the side wall of the end plate 101a of the fixed scroll wrap, and the closed space for injecting the liquid refrigerant is the discharge port. It is configured so as to communicate intermittently with 102.

The position of the pores for liquid injection is shown by the following equation. ◆ λ _in <λ _s + 2π (3) 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: circular constant.

With the above structure, the liquid refrigerant injected into the closed space can be intermittently discharged to the discharge port 102 by the swirling motion of the swirl scroll, and even when a large amount of the liquid refrigerant is injected into the closed space. Liquid compression can be prevented.

In the above formula (3), practically the liquid refrigerant injecting pores 141a and 141b preferably have a positional relationship of λ _in ≈λ _s + 2π− (π / 6 to π / 4) (4).

FIG. 5 shows an acupressure diagram (P-λ diagram) in an ideal case showing the relationship between the pressure inside the scroll and the scroll wrap winding angle in this embodiment. In the figure, λ _q means the scroll wrap winding start portions P and P ′ shown in FIG.
Shows the scroll wrap winding angle at the positions Q and Q'of the first winding from the outside toward the outside of the lap. Therefore, the liquid refrigerant injection period during the discharge process, in other words, the discharge port and the liquid refrigerant injection fine holes 141a, 14 through the closed space in the discharge process.
According to FIG. 5, the period in which 1b is in communication is a contact section expressed by the following equation when expressed by the scroll wrap winding angle.

Δλ _d = λ _q −λ _in (5) where Δλ _d is the contact range (rad) on the scroll wrap winding angle that is the liquid refrigerant injection section during the discharge stroke λ _{in is the} liquid refrigerant injection fine Scroll wrap winding angle (rad) λ _{q at} the position of the hole: Contact point Q of both scrolls at the instant when the discharge stroke is completed
Scroll wrap winding angle (ra
d).

With the above structure, the turning scroll is
- the liquid refrigerant injection pores during one rotation of the Le ejection space and [Delta] [lambda] _d (r
It is possible to connect intermittently within the range of the rotation angle of (ad).

FIG. 6 corresponds to a combination of the embodiments of FIGS. 2 and 4 described above, and the positional relationship between the liquid refrigerant injection pores, the gas pressure derivation pores and the discharge port is shown below. It is configured as follows.

That is, the liquid refrigerant injection pores 142a, 1
42b is provided at a position close to the fixed scroll wrap within one turn from the winding start end of the scroll wrap, and gas pressure derivation fine holes 143a, 143b are further provided than the liquid refrigerant injection fine holes 142a, 142b. It is provided at a position within one winding toward the end (outside) of the winding end of the wrap.

The above positional relationship is expressed by the following equation. ◆ λ _s + 2π> λ _in > λ _b −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) λ _b : scroll wrap winding angle (rad) at the position of the gas pressure deriving pore π: circular constant.

By constructing the respective pores in the above-mentioned positional relationship, the liquid refrigerant injecting pores 14 for injecting the liquid refrigerant into the closed space are provided.
2a and 142b communicate with the discharge space intermittently,
Furthermore, it is possible to intermittently communicate with the gas pressure derivation pores 143a and 143b through the closed spaces 121a and 121b. Therefore, the injected liquid refrigerant intermittently flows into the discharge space and the back pressure chamber, so that the liquid compression at the time of start-up can be completely prevented and an abnormal pressure rise in the closed space can be prevented.

The fine pores 142a in the embodiment of FIG.
Numerical examples of the positional relationship between 142b, 143a, and 143b are shown by numerical values. For example, λ _s ≈1.1 rad λ _q ≈7.4 rad λ _in ≈6.8 rad λ _b so that equation (6) is satisfied. ≈12.5 rad (7)

Further, as shown in the equation (6), the positions of the liquid refrigerant injection fine holes 142a, 142b are set in the direction of the winding start portion of the wrap from the positions of the gas pressure derivation fine holes 143a, 143b. To be done. This is to minimize 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, and to prevent the excessive cooling action by reducing the liquid refrigerant injection amount. is there.

FIG. 7 shows a low pressure chamber type vertical hermetic scroll compressor in which the inside of the hermetically sealed container is mainly in an atmosphere of suction pressure. In the case of the embodiment described with reference to FIG. It can also be applied to scroll compressors.

In FIG. 7, a hermetically-sealed container 200 is provided with a compressor section composed of a fixed scroll member 201 and an orbiting scroll member 205 on the upper side and an electric motor section 259 on the lower side, and a compressor section via a rotary shaft 257. It houses the electric motor section in a row.

The rotary shaft 257 is supported by a main bearing 262 provided on the frame 256 and a lower bearing 263 provided on the bottom wall, and the slewing bearing 2 eccentrically provided on the upper part of the main shaft.
An orbiting shaft 257a of an orbiting scroll member is supported by 61. 262a is a slide be sampled bearings (rolling bearings), the gas forces generated in the enclosed space of the compressor unit (compression chamber) 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. Reference numeral 267 denotes an intermediate pressure chamber formed at the back of the fixed scroll by the partition wall 267a, which communicates with the closed space 221 in the compression process through the pores 268 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 later, and is discharged from the discharge port 266 in the upper portion of the sealed container through the discharge port 27.
1 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, the liquid refrigerant injection fine hole 269 is provided in the end plate, and the fine hole 269 is different from the gas pressure deriving fine hole 268 as shown in the equation (1). 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.

Further, 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 equation (2). Further, as shown in FIG. 7, a low pressure chamber type hermetic scroll with an electric motor built in a low pressure refrigerant gas region.
When Le compressor, since it is due Ri motor cooled to a low temperature of suction refrigerant gas, there is less possible benefits the liquid refrigerant amount to be injected for cooling the electric motor. Since the amount of the liquid refrigerant to be injected can be further reduced, the amount of the liquid refrigerant injected and remaining in the closed space is further reduced, and the liquid compression action at the time of starting in the closed space can be further avoided. Then, by reducing the amount of the injected liquid refrigerant for cooling, the power of the compressor can be reduced and the energy saving of the entire refrigeration system can be realized. Further, the liquid refrigerant compressing action at the time of start-up described above can be completely avoided, the start-up torque can be reduced, and the power at start-up can be reduced. Therefore, subordinate
Scroll as seen in coming apparatus - Rurappu of damage accident and starting failure phenomena and the like contamination to the condenser side can be prevented in advance, sucrose - Shin of the entire refrigeration apparatus using the Le compressor <br / > The reliability can be greatly improved.

[0057]

As described above, according to the present invention, a working liquid is cooled by injecting a liquid refrigerant into a closed space formed by both scroll members, and at the time of starting or immediately before stopping the compressor. In addition, even if the injected incompressible liquid refrigerant is filled in the closed space, the liquid refrigerant is cooled by the swirl scroll.
Refrigeration using a scroll fluid machine that can prevent liquid compression and abnormal pressure rise inside the enclosed space because it can be discharged through the pressure derivation pores and the discharge port during rotation.
There is an effect that the device can be obtained. Therefore, it is possible to prevent a start-up failure such as a breakage accident of the scroll wrap due to the liquid compression or an abnormal pressure rise in the closed space so that the orbiting scroll member separates from the fixed scroll member and does not perform a compression action.

[Brief description of drawings]

FIG. 1 is a refrigeration system using a scroll fluid machine of the present invention.
A diagram showing a refrigeration cycle refrigerant circuit showing an example of
It is the figure which showed only the principal part of a scroll fluid machine by the longitudinal cross-sectional view .

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 in an engaged state according to another embodiment of the present invention.

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 showing a scroll lap meshing state according to still another embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing an example in which the present invention is applied to a low pressure chamber type hermetic scroll fluid machine.

[Explanation of symbols]

101 ... Fixed scroll member, 101a ... End plate, 103
... Suction port, 105 ... Orbiting scroll member, 122 ... Suction chamber, 121a, 121b ... Sealed space, 123 ... Back pressure chamber,
131 ... Discharge pipe, 102 ... Discharge port, 124a, 124
b ... Pores for derivation of gas pressure, 135 ... Pipes for liquid injection, 137
... Pressure reducer 139a, 139b, 141a, 141b ...
Liquid refrigerant injection pores, 164 ... Intake pipe, 182 ... Condenser, 184 ... Expansion valve, 185 ... Evaporator.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F25B 1/04 F25B 1/04 Y

Claims (2)

(57) [Claims] 1. A fixed disc for upstanding a spiral wrap on an end plate.
Put the roll member and the orbiting scroll member together with the wrap
Engage the inner side and fix the fixed scroll member.
Consists of a frame and the back of the end plate of the orbiting scroll member
A back pressure chamber is provided, and the back pressure chamber and the fixed scroll member are rotated.
Compressed from the enclosed space formed by the orbiting scroll member
Fixed gas pressure derivation pore that guides gas in the middle Scroll section
Installed on the end plate of the material or on the end plate of the swivel scroll member.
The fixed scroll without rotating the rotating scroll member.
-Rotate to the fixed member to make it a fixed scroll member.
Has a discharge port that opens in the center and a suction port that opens in the outer periphery.
Gas is sucked in through the suction port, and the scroll members
The volume is reduced by moving the formed enclosed space to the center.
Scroll that compresses gas and discharges compressed gas from the discharge port
Fluid machine and evaporator connected to the suction side of the scroll fluid machine
And a condenser connected to the discharge side of the scroll fluid machine.
And a pipe between the outlet side of the condenser and the suction side of the evaporator.
In a refrigerating apparatus comprising a provided expansion valve to constitute a refrigerating cycle, said densely facing the wrap tooth tip surface of said swirl scroll member.
Mirror of the fixed scroll member so as to open in the closed space
Pivoting movement of the swivel scroll member penetrating the plate portion
Through the space formed by both scroll members.
Then, so as to communicate intermittently with the gas pressure derivation pores,
From the position of the gas pressure derivation pores to the winding start side of the wrap
Working gas provided within one wrap
A liquid refrigerant injection hole for cooling is provided, and a pipe connecting the condenser and the expansion valve and the liquid refrigerant injection
The micropores for communication are made to communicate with each other using a liquid injection pipe, and the liquid is injected.
Scroll flow characterized by a decompressor installed in the piping
Refrigeration equipment using body machines. 2. A fixed disc for upstanding a spiral wrap on an end plate.
Put the roll member and the orbiting scroll member together with the wrap
Engage inside to allow the orbiting scroll member to rotate.
The fixed scroll member is swung to the fixed scroll member.
The crawl member has a discharge port that opens in the center and an opening in the outer periphery.
A suction port is provided to allow the gas to be sucked in through the suction port.
Move around the enclosed space formed by the roll members
The volume is reduced to compress the gas, and the compressed gas is discharged from the discharge port.
And a evaporator connected to the suction side of the scroll fluid machine.
And a condenser connected to the discharge side of the scroll fluid machine.
And a pipe between the outlet side of the condenser and the suction side of the evaporator.
In a refrigerating apparatus comprising a provided expansion valve to constitute a refrigerating cycle, said densely facing the wrap tooth tip surface of said swirl scroll member.
Mirror of the fixed scroll member so as to open in the closed space
The swivel scroll member is provided so as to penetrate the plate portion.
Formed by the two scroll members by the turning motion of
Only through the discharge space of the fixed scroll member through the space
Scroll wrap winding starts to allow intermittent communication
At a position within 1 turn from the edge along the outer surface of the wrap
Provided at a position close to the outer peripheral surface of one fixed scroll wrap
The liquid refrigerant injection pore for working gas cooling provided, the liquid refrigerant injected pipe that connects the condenser and the expansion valve
The micropores for communication are made to communicate with each other using a liquid injection pipe, and the liquid is injected.
Scroll flow characterized by a decompressor installed in the piping
Refrigeration equipment using body machines.