JPWO2020049844A1 - Compressor and refrigeration cycle equipment equipped with it - Google Patents

Abstract

Provide highly reliable compressors and the like. The compressor (1) includes a compression mechanism unit (J) and a closed container (19) that houses at least the compression mechanism unit (J) and is filled with refrigerating machine oil. The above-mentioned refrigerant contains trifluoroiodomethane, and the refrigerating machine oil has compatibility with the refrigerant. The compression mechanism unit (J) has a fixed scroll (11) and a swivel scroll (12) that forms a compression chamber (P) between the fixed scroll (11) and the fixed scroll (11) by its movement. The compression mechanism unit (J) is provided with an injection hole (h1) that guides the condensed refrigerant to the compression chamber (P).

Description

The present invention relates to a compressor or the like.

For refrigeration cycle equipment such as air conditioners, it has been proposed to use a refrigerant containing trifluoroiodomethane (CF ₃ I). Trifluoroiodomethane is a nonflammable refrigerant with a very low GWP (Global Warming Potential), but its stability as a substance is not so high. That is, trifluoroiodomethane is easily decomposed at a high temperature, and as a result, an acidic substance such as hydrogen iodide may be generated.

As a device for suppressing the decomposition of such trifluoroiodomethane, for example, the technique described in Patent Document 1 is known. That is, Patent Document 1 describes that the temperature of the refrigerant containing the CI bond is kept below a predetermined upper limit temperature by reducing the discharge capacity of the compressor.

Japanese Unexamined Patent Publication No. 2008-128493

Patent Document 1 describes that the discharge capacity of the compressor is reduced as described above, but another method is used to suppress the decomposition of trifluoroiodomethane and further enhance the reliability of the compressor and the like. There is room.

Therefore, an object of the present invention is to provide a highly reliable compressor or the like.

In order to solve the above-mentioned problems, the compressor according to the present invention includes a compression mechanism unit that compresses the gaseous refrigerant sucked through the suction chamber in the compression chamber and discharges the compressed refrigerant through the discharge port. The refrigerant includes trifluoroiodomethane, and the refrigerating machine oil is compatible with the refrigerant. The compression mechanism unit includes a fixing member provided with the discharge port and a moving member that forms a compression chamber between the fixing member and the fixing member by its movement. It is characterized in that an injection hole for guiding the condensed refrigerant to the compression chamber is provided.

According to the present invention, it is possible to provide a highly reliable compressor or the like.

It is a block diagram which includes the refrigerant circuit of the air conditioner which concerns on embodiment of this invention. It is a vertical sectional view of the compressor which concerns on embodiment of this invention. It is a cross-sectional view of the line II-II of FIG. 2 in the state where the injection hole communicates with the swirl outer line chamber in the compression mechanism part provided in the compressor according to the embodiment of the present invention. FIG. 5 is a cross-sectional view of a compression mechanism portion included in a compressor according to an embodiment of the present invention, in which an injection hole is closed by a swirl wrap. FIG. 5 is a cross-sectional view of a compression mechanism portion included in a compressor according to an embodiment of the present invention, in which an injection hole communicates with a swivel extension chamber. It is a cross-sectional view of the compression mechanism part of the compressor which concerns on the 1st modification of this invention, the state which the injection hole communicates with both the swing outer line chamber and the swing extension chamber. It is sectional drawing of the compression mechanism part of the compressor which concerns on the 2nd modification of this invention, the state which two injection holes communicate with a swivel extension chamber. It is a cross-sectional view which shows another state in the compression mechanism part of the compressor which concerns on the 2nd modification of this invention. It is sectional drawing of the compression mechanism part of the compressor which concerns on the 3rd modification of this invention. It is sectional drawing of the compression mechanism part of the compressor which concerns on 4th modification of this invention. It is sectional drawing of the compression mechanism part of the compressor which concerns on 5th modification of this invention. It is a cross-sectional view which shows another state in the compression mechanism part of the compressor which concerns on 5th modification of this invention.

In the following, as an example, an air conditioner W (refrigeration cycle device: see FIG. 1) including a scroll type compressor 1 (see FIGS. 1 and 2) will be described.

<< Embodiment >>
<Composition of air conditioner>
FIG. 1 is a configuration diagram including a refrigerant circuit Q of the air conditioner W according to the embodiment.
The solid line arrow in FIG. 1 indicates the flow of the refrigerant during the cooling operation.
Further, the broken line arrow in FIG. 1 indicates the flow of the refrigerant during the heating operation.
The air conditioner W is a device that performs air conditioning such as cooling operation and heating operation. As shown in FIG. 1, the air conditioner W includes a compressor 1, an accumulator 2, an outdoor heat exchanger 3, an outdoor fan Fo, an outdoor expansion valve 4, and injection valves Va and Vb. There is. Further, in addition to the above-described configuration, the air conditioner W includes an indoor expansion valve 5, an indoor heat exchanger 6, an indoor fan Fi, a four-way valve 7, an outdoor control circuit Go, and an indoor control circuit Gi. It has.

In the example shown in FIG. 1, a compressor 1, an accumulator 2, an outdoor heat exchanger 3, an outdoor expansion valve 4, and the like are installed in the outdoor unit Uo. On the other hand, the indoor expansion valve 5, the indoor heat exchanger 6, and the like are installed in the indoor unit Ui.

The compressor 1 is a device that compresses a low-temperature low-pressure gas refrigerant and discharges it as a high-temperature high-pressure gas refrigerant. The suction side of the compressor 1 is connected to the accumulator 2 via a suction pipe ka. On the other hand, the discharge side of the compressor 1 is connected to the four-way valve 7 via the discharge pipe kb.
The accumulator 2 is a shell-shaped member that separates gas and liquid from the refrigerant that sequentially flows through the four-way valve 7 and the pipe kc.

The outdoor heat exchanger 3 is a heat exchanger in which heat exchange is performed between the refrigerant flowing through the heat transfer tube (not shown) and the outside air sent from the outdoor fan Fo. One end (gas side) of the outdoor heat exchanger 3 is connected to the four-way valve 7 via the pipe kd, and the other end (liquid side) is connected to the indoor heat exchanger 6 via the pipe ke.
The outdoor fan Fo is a fan that sends outside air to the outdoor heat exchanger 3, and is installed in the vicinity of the outdoor heat exchanger 3.

The outdoor expansion valve 4 is a valve for reducing the pressure of the refrigerant condensed by the "condenser" (one of the outdoor heat exchanger 3 and the indoor heat exchanger 6), and is provided in the pipe ke. Then, the refrigerant decompressed by the outdoor expansion valve 4 is directed to the "evaporator" (the other of the outdoor heat exchanger 3 and the indoor heat exchanger 6) via the pipe ke. The indoor expansion valve 5 provided in the vicinity of the indoor heat exchanger 6 in the piping ke also has the same function as the outdoor expansion valve 4.

The indoor heat exchanger 6 is a heat exchanger in which heat exchange is performed between the refrigerant passing through the heat transfer tube (not shown) and the indoor air (air in the air conditioning target space) sent from the indoor fan Fi. Is. One end (liquid side) of the indoor heat exchanger 6 is connected to the outdoor heat exchanger 3 via the pipe ke, and the other end (gas side) is connected to the four-way valve 7 via the pipe kf.
The indoor fan Fi is a fan that sends indoor air to the indoor heat exchanger 6, and is installed in the vicinity of the indoor heat exchanger 6.

The four-way valve 7 is a valve that switches the flow path of the refrigerant according to the operation mode of the air conditioner W. That is, during the cooling operation (see the solid arrow in FIG. 1), the compressor 1, the outdoor heat exchanger 3 (condenser), the outdoor expansion valve 4 (expansion valve), the indoor expansion valve 5 (expansion valve), and Refrigerant circulates in the refrigeration cycle through the indoor heat exchanger 6 (evaporator) in sequence.

On the other hand, during the heating operation (see the dashed arrow in FIG. 1), the compressor 1, the indoor heat exchanger 6 (condenser), the indoor expansion valve 5 (expansion valve), the outdoor expansion valve 4 (expansion valve), and Refrigerant circulates in the refrigeration cycle through the outdoor heat exchanger 3 (evaporator) in sequence.

That is, in the refrigerant circuit Q in which the refrigerant circulates sequentially through the compressor 1, the "condenser", the "expansion valve", and the "evaporator", one of the above-mentioned "condenser" and "evaporator" is outdoors. The heat exchanger 3 and the other is the indoor heat exchanger 6.

The injection valves Va and Vb are valves for guiding the refrigerant condensed by the "condenser" to the compressor 1, and are provided in the pipe kg. One end of the pipe kg is connected between the outdoor heat exchanger 3 and the outdoor expansion valve 4 in the pipe ke described above. Further, the other end of the pipe kg is connected between the indoor heat exchanger 6 and the indoor expansion valve 5 in the pipe ke.

Then, during the cooling operation, one injection valve Va is appropriately opened, and the other injection valve Vb is closed. As a result, the refrigerant condensed in the outdoor heat exchanger 3 is guided to the compression chamber P (see FIG. 2) through the pipe ke (part), the pipe kg (part), and the pipe kh in that order.
On the other hand, during the heating operation, one injection valve Va is closed and the other injection valve Vb is appropriately opened. As a result, the refrigerant condensed in the indoor heat exchanger 6 is guided to the compression chamber P (see FIG. 2) through the pipe ke (part), the pipe kg (part), and the pipe kh in that order.

The upstream end of the pipe kh is connected between the injection valves Va and Vb in the pipe kg, and the downstream end is inserted into the injection hole h1 (see FIG. 2) of the fixed scroll 11 (see FIG. 2) described later. It has been.
The "switching means" provided in the pipe kg for guiding the refrigerant to the injection hole h1 and switching the flow / cutoff of the refrigerant through the pipe kg includes the injection valves Va and Vb.

The discharge temperature sensor 8 is a sensor that detects the temperature of the refrigerant discharged from the compressor 1, and is installed in, for example, the discharge pipe kb. In addition, although not shown in FIG. 1, sensors for detecting the suction pressure, discharge pressure, indoor temperature, outdoor temperature, etc. of the compressor 1 are provided. The detected value of each sensor including the discharge temperature sensor 8 is output to the outdoor control circuit Go and the indoor control circuit Gi described below.

Although not shown, the outdoor control circuit Go is configured to include electronic circuits such as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and various interfaces. Then, the program stored in the ROM is read out and expanded in the RAM, and the CPU executes various processes. The outdoor control circuit Go controls the compressor 1, the outdoor fan Fo, the outdoor expansion valve 4, the injection valves Va, Vb, etc., based on the command from the remote controller (not shown) and the detected value of the discharge temperature sensor 8. ..

Although not shown, the indoor control circuit Gi includes electronic circuits such as a CPU, ROM, RAM, and various interfaces. The indoor control circuit Gi performs predetermined communication with the outdoor control circuit Go to control the indoor expansion valve 5, the indoor fan Fi, and the like. Hereinafter, the outdoor control circuit Go and the indoor control circuit Gi are collectively referred to as “control means”.

For example, when the detection value of the discharge temperature sensor 8 becomes equal to or higher than the “predetermined value” during the cooling operation, the “control means” sequentially passes through the pipes kg, kh and the injection hole h1 (see FIG. 2) described later. The injection valve Va (switching means) is switched from closed to open so that the refrigerant can flow through. During the cooling operation, the other injection valve Vb is maintained in the closed state. Further, during the heating operation, the other injection valve Vb is appropriately opened. As a result, it is possible to prevent the temperature of the refrigerant compressed by the compressor 1 from becoming too high.
The above-mentioned "predetermined value" is a predetermined temperature threshold value lower than the temperature at which trifluoroiodomethane contained in the refrigerant starts to decompose, and is set in advance.

<Refrigerant>
The refrigerant circulating in the refrigerant circuit Q contains trifluoroiodomethane (CF ₃ I). As such a refrigerant, trifluoroiodomethane may be used alone, or a mixed refrigerant containing trifluoroiodomethane and another refrigerant may be used. Examples of other refrigerants include CO ₂ , hydrocarbons, ethers, fluoroethers, fluoroalkenes, HFCs, HFOs, HClFOs, HBrFOs and the like.

In addition, "HFC" indicates hydrofluorocarbon. "HFO" is a hydrofluoroolefin composed of a carbon atom, a fluorine atom, and a hydrogen atom, and has at least one carbon-carbon double bond. "HClFO" consists of carbon, chlorine, fluorine and hydrogen atoms and has at least one carbon-carbon double bond. "HBrFO" consists of carbon, bromine, fluorine and hydrogen atoms and has at least one carbon-carbon double bond.

Examples of HFC include difluoromethane (HFC32), pentafluoroethane (HFC125), 1,1,2,2-tetrafluoroethane (HFC134), 1,1,1,2-tetrafluoroethane (HFC134a), and trifluoroethane. (HFC143a), difluoroethane (HFC152a), 1,1,1,2,3,3,3-heptafluoropropane (HFC227ea), 1,1,1,3,3,3-hexafluoropropane (HFC236fa), 1 , 1,1,3,3-pentafluoropropane (HFC245fa), and 1,1,1,3,3-pentafluorobutane (HFC365mfc) are exemplified.

Examples of the above-mentioned fluoroalkene include fluoroethane, fluoropropene, fluorobutene, chlorofluoroethane, chlorofluoropropene, and chlorofluorobutene. Fluoropropenes include 3,3,3-trifluoropropene (HFO1243zf), 1,3,3,3-tetrafluoropropene (HFO1234ze), 2,3,3,3-tetrafluoropropene (HFO1234yf), and HFO1225. Is exemplified.

Examples of the above-mentioned fluorobutene include C ₄ H ₄ F ₄ , C ₄ H ₃ F ₅ (HFO 1345), and C ₄ H ₂ F ₆ (HFO 1336). The chlorofluorohydrocarbons _{ethene, C 2 F 3 Cl (CTFE} ) are exemplified. Examples of chlorofluoropropene include 2-chloro-3,3,3-trifluoro-1-propene (HCFO1233xf) and 1-chloro-3,3,3-trifluoro-1-propene (HCFO1233zd). ..

Trifluoroiodomethane, difluoromethane (HFC32), pentafluoroethane (HFC125), and hexafluoropropene as refrigerants to adjust GWP (Global Warming Potential), vapor pressure, and flame retardancy parameters. It is preferable to use one or more of (FO1216).

In addition, in order to obtain a vapor pressure that matches the capacity of the equipment, the refrigerant includes HFO1234yf, HFO1234ze, 1,1,1,2-tetrafluoroethane (HFC134a), HFO1123, etc., and affects the vapor pressure and efficiency related to the capacity. It is preferable to adjust the degree of temperature gradient to be applied by the mixed concentration.

The blending amount of trifluoroiodomethane in the mixed refrigerant is 10% or more and 100% or less, preferably 20% or more and 80% or less, and more preferably 30% or more and 50% or less on a mass basis.

For the GWP, the value (100-year value) of the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) is used. Further, as the GWP of the refrigerant not described in AR4, the value of the IPCC Fourth Assessment Report (AR5) may be used, or the value described in other publicly known documents may be used, or a known value may be used. The value calculated or measured by the method may be used. According to AR4, the GWP of trifluoroiodomethane is 0.4, the GWP of HFC32 is 675, and the GWP of HFC125 is 3,500.

The GWP of the refrigerant is 750 or less, preferably 500 or less, more preferably 150 or less, still more preferably 100 or less, and particularly preferably 75 or less.
The vapor pressure of the refrigerant at 25 ° C. is preferably in the range of 1.4 MPa to 1.8 MPa. The flame retardant parameter of the refrigerant represented by the following mathematical formula (1) is preferably 0.46 or less. In the mathematical formula (1), F _mix indicates the flame retardancy parameter of the mixed refrigerant, Fi indicates the flame retardancy parameter of each refrigerant component, and xi indicates the mole fraction of each refrigerant component.

F _mix = Σ _i Fi · xi ・ ・ ・ (1)

As the refrigerating machine oil, a polyol ester oil or a polyvinyl ether oil having a kinematic viscosity at 40 ° C. of 30 to 100 mm ² / s is preferable. The kinematic viscosity is measured based on standards such as ISO (International Organization for Standardization) 3104, ASTM (American Society for Testing and Materials) D445, D7042 and the like. The low-temperature side critical dissolution temperature of the refrigerant and the refrigerating machine oil is preferably + 10 ° C. or lower.

Examples of the refrigerating machine oil having the above characteristics include polyol ester oil represented by the chemical formulas (1) and (2) and polyvinyl ether oil represented by the chemical formula (3). In formulas (1) and (2), R ^{1 to} R ¹⁰ represent alkyl groups having 4 to 9 carbon atoms, which may be the same or different. Further, in the formula (3), OR ¹¹ is a methyloxy group, an ethyloxy group, a propyloxy group or a butyloxy group, and n is 5 to 15.

Refrigerating machine oils such as the polyol ester oil and polyvinyl ether oil described above have compatibility with the refrigerant. As a result, even if a part of the refrigerating machine oil flows out from the compressor 1 together with the refrigerant, the refrigerating machine oil circulates in the refrigerant circuit Q together with the refrigerant and returns to the compressor 1. Therefore, since the refrigerating machine oil hardly accumulates in a place other than the compressor 1, the lubricity and reliability of each component of the compressor 1 can be ensured.

<Compressor configuration>
FIG. 2 is a vertical sectional view of the compressor 1 according to the embodiment.
The compressor 1 shown in FIG. 2 is a device that compresses a gaseous refrigerant in the compression chamber P between the fixed scroll 11 and the swivel scroll 12. As shown in FIG. 2, the compressor 1 includes a crankshaft 14, an electric motor 18, a closed container 19, and the like, in addition to the compression mechanism unit J including the fixed scroll 11 and the swivel scroll 12.

The compression mechanism unit J is a mechanism that compresses the gaseous refrigerant sucked through the suction chamber M in the compression chamber P and discharges the compressed refrigerant through the discharge port N. The compression mechanism portion J includes a fixed scroll 11 and a swivel scroll 12, and is arranged in the upper space inside the closed container 19 in the example shown in FIG.

The fixed scroll 11 is a "fixing member" fixed in the closed container 19. The fixed scroll 11 has a base plate 11a and a spiral fixed wrap 11b (see also FIG. 3A) erected on the base plate 11a.

A discharge port N for discharging the compressed refrigerant is provided near the center of the base plate 11a which has a circular shape in a plan view. Further, an injection hole h1 for guiding the refrigerant condensed by the "condenser" to the compression chamber P is provided at a predetermined position on the base plate 11a. The above-mentioned pipe kh (see also FIG. 1) is inserted into the injection hole h1.

The swivel scroll 12 is a "moving member" that forms a compression chamber P with the fixed scroll 11 by its movement. The swivel scroll 12 is arranged so as to be swivelable while facing the fixed scroll 11. The swivel scroll 12 has a base plate 12a and a spiral swirl wrap 12b erected on the base plate 12a.

Then, the fixed lap 11b and the swivel lap 12b are meshed with each other, so that a plurality of compression chambers P are formed between the fixed scroll 11 and the swivel scroll 12. The compression chamber P described above is a space for compressing the refrigerant.
For example, the swivel outer line chamber Po (see FIG. 3A), which is a space between the outer line side of the swivel scroll 12 and the fixed scroll 11, functions as the compression chamber P described above. Further, the turning extension chamber Pi (see FIG. 3A), which is a space between the extension side of the turning scroll 12 and the fixed scroll 11, functions as another compression chamber P.

Then, as the swivel scroll 12 turns, the injection hole h1 communicates with at least one of the swivel outer line chamber Po and the swivel extension chamber Pi. The details of the communication of the injection hole h1 will be described later.

The frame 13 shown in FIG. 2 is a member that supports the swivel scroll 12, and is fastened to the fixed scroll 11.
The crankshaft 14 is a shaft that rotates with the drive of the electric motor 18, and is rotatably supported by a main bearing 15 and an auxiliary bearing 16. Further, the upper end portion of the crankshaft 14 is eccentrically rotated with respect to the rotation shaft of the electric motor 18. Inside the crankshaft 14, an oil supply flow path i for guiding refrigerating machine oil is provided in the main bearing 15, the sub bearing 16, and the like.

The old dam ring 17 is a ring-shaped member that receives eccentric rotation of the upper end portion of the crankshaft 14 and rotates the swivel scroll 12 without rotating.
The electric motor 18 is a drive source for rotating the crankshaft 14, and is arranged below the frame 13. The electric motor 18 includes a stator 18a fixed to the inner peripheral wall of the closed container 19 and a rotor 18b that is rotatable in the stator 18a.

The closed container 19 is a shell-shaped container that houses the compression mechanism portion J, the crankshaft 14, the electric motor 18, and the like, and is in a substantially sealed state. Refrigerating machine oil L (also referred to as lubricating oil) for improving the lubricity and sealing property of the compressor 1 is sealed in the closed container 19. The refrigerating machine oil L is stored in the bottom of the closed container 19.

The suction pipe ka shown in FIG. 2 is a pipe that guides the refrigerant to the suction chamber M of the compression mechanism unit J, and is inserted into a predetermined position of the closed container 19. The suction chamber M is a space for temporarily storing the refrigerant during suction by the compression mechanism unit J, and is provided in the fixed scroll 11.

When the swivel scroll 12 is swiveled by the drive of the electric motor 18, the gaseous refrigerant is guided to the suction chamber M via the suction pipe ka. Then, the compression chamber P between the fixed scroll 11 and the swirling scroll 12 moves in a spiral shape while gradually reducing its volume, so that the refrigerant is compressed. The compressed refrigerant is discharged through the discharge port N near the center of the fixed scroll 11. The gaseous refrigerant discharged in this way fills the inside of the closed container 19 and is further guided to the four-way valve 7 (see FIG. 1) via the discharge pipe kb.

<Refrigerant injection>
As described above, the refrigerant circulating in the refrigerant circuit Q (see FIG. 1) contains trifluoroiodomethane. Therefore, if the temperature of the refrigerant discharged from the compressor 1 becomes too high, trifluoroiodomethane contained in the refrigerant may be decomposed in some cases. Therefore, in the present embodiment, in order to suppress the decomposition of trifluoroiodomethane, a part of the refrigerant condensed by the "condenser" is injected into the compression chamber P.

In the example shown in FIG. 2, the injection hole h1 is opened at a predetermined position in the groove portion between the fixed wraps 11b. Then, the relatively low-temperature refrigerant condensed by the "condenser" is sequentially injected into the compression chamber P through the pipe kh and the injection hole h1.

Further, in the present embodiment, as will be described with reference to FIGS. 3A, 3B, and 3C below, the refrigerant intermittently and alternately enters the swivel outer line chamber Po and the swivel extension chamber Pi through one injection hole h1. Is injected.

FIG. 3A is a cross-sectional view of the line II-II of FIG. 2 in a state where the injection hole h1 communicates with the swivel outer line chamber Po in the compression mechanism unit J included in the compressor.
As shown in FIG. 3A, one injection hole h1 is provided in the base plate 11a of the fixed scroll 11. Then, in the process of turning the turning scroll 12, the turning outside line chamber Po and the injection hole h1 are temporarily communicated with each other.

As a result, the liquid-phase or gas-liquid two-phase refrigerant condensed by the "condenser" is injected into the swirling outer line chamber Po through the injection hole h1. As a result, the temperature rise of the refrigerant compressed in the swirling outer line chamber Po is suppressed, and the decomposition of trifluoroiodomethane contained in the refrigerant is suppressed.

FIG. 3B is a cross-sectional view of a state in which the injection hole h1 is closed by the swivel lap 12b.
As shown in FIG. 3B, the diameter of the injection-side opening in the injection hole h1 is smaller than the wall thickness of the swirl wrap 12b. Therefore, when the swivel scroll 12 moves to the predetermined position shown in FIG. 3B, the injection hole h1 is temporarily closed by the swivel lap 12b.

FIG. 3C is a cross-sectional view of a state in which the injection hole h1 communicates with the turning extension chamber Pi.
In the process of turning the swivel scroll 12, the injection hole h1 is once closed by the swivel lap 12b (see FIG. 3B), and then the swivel extension chamber Pi and the injection hole h1 are temporarily communicated with each other. As a result, since the refrigerant is injected into the swirling extension chamber Pi through the injection hole h1, the temperature rise of the refrigerant in the swirling extension chamber Pi can be suppressed.

As described above, in the present embodiment, the communication of the injection hole h1 to the turning extension chamber Po and the communication of the injection hole h1 to the turning extension chamber Pi are intermittently and alternately repeated with the turning of the turning scroll 12. It is designed to be used.

<Effect>
According to the present embodiment, by using a refrigerant containing trifluoroiodomethane, the GWP is significantly lower than before, so that the influence on global warming can be suppressed. Further, the relatively low temperature refrigerant condensed by the "condenser" is injected into the compression chamber P (see FIG. 2). As a result, the temperature rise of the refrigerant compressed by the compression mechanism unit J is suppressed, and the decomposition of trifluoroiodomethane contained in the refrigerant is suppressed. Therefore, the reliability of the compressor 1 can be increased, and the reliability of the air conditioner W can be increased.

Further, according to the present embodiment, one injection hole h1 is provided in the fixed scroll 11 (see FIG. 3A). Therefore, the configuration of the compressor 1 can be simplified and the manufacturing cost can be reduced as compared with the configuration in which a plurality of injection holes (not shown) are provided.

Further, the refrigerant is alternately injected into the turning outer line chamber Po and the turning extension chamber Pi through one injection hole h1. Therefore, even if there is a predetermined pressure difference between the turning outer line chamber Po and the turning extension chamber Pi, it is almost impossible that a large amount of refrigerant is injected to one side and no refrigerant is injected to the other side. As a result, a relatively low temperature refrigerant can be injected into both the swirling extension chamber Po and the swirling extension chamber Pi through the injection hole h1.

≪Modification example≫
Although the compressor 1 and the like according to the present invention have been described above in the embodiments, the present invention is not limited to these descriptions, and various modifications can be made.
For example, in the embodiment, a configuration in which the diameter of the opening of the injection hole h1 on the injection side is smaller than the wall thickness of the swirl wrap 12b (see FIG. 3B) has been described, but the present invention is not limited to this. That is, the configuration shown in FIG. 4 below may be used.

<First modification>
FIG. 4 is a cross-sectional view of the compression mechanism portion JA of the compressor according to the first modification, in which the injection hole h2 communicates with both the swivel outer line chamber Po and the swivel extension chamber Pi.
In the example shown in FIG. 4, the diameter of the opening on the injection side in the injection hole h2 is larger than the wall thickness of the swirl wrap 12b. Then, when the swivel scroll 12 moves near the center of the injection hole h2, the swivel outer line chamber Po and the swivel extension chamber Pi communicate with the injection hole h1 at the same timing.

That is, the injection hole h2 communicates with both the turning outer line chamber Po and the turning extension chamber Pi in the process in which the injection hole h2 and the turning lap 12b partially overlap with each other as the turning scroll 12 turns. Even with such a configuration, it is possible to suppress the temperature rise of the refrigerant and suppress the decomposition of trifluoroiodomethane contained in the refrigerant in each of the swirling extension chamber Po and the swirling extension chamber Pi.

<Second modification>
FIG. 5A is a cross-sectional view of the compression mechanism portion JB of the compressor according to the second modification, in which two injection holes h3a and h3b are communicated with the swivel extension chamber Pi.
In the example shown in FIG. 5A, two injection holes h3a and h3b are provided in the base plate 11a of the fixed scroll 11. Then, when the swivel scroll 12 moves to the predetermined position shown in FIG. 5A, both the injection holes h3a and h3b communicate with the swivel extension chamber Pi. As a result, the temperature rise of the refrigerant compressed in the swirl extension chamber Pi can be suppressed.

FIG. 5B is a cross-sectional view showing another state in the compression mechanism portion JB of the compressor according to the second modification.
When the swivel scroll 12 moves from the state of FIG. 5A to the predetermined position shown in FIG. 5B, one injection hole h3a communicates with the swivel extension chamber Pi and the other injection hole h3b communicates with the swivel extension chamber Po. As a result, the temperature rise of the refrigerant can be suppressed even in the swirling outer line chamber Po. In this way, in the configuration in which the plurality of injection holes h3a and h3b are provided, the injection holes h3a and h3b communicate with at least one of the turning outer line chamber Po and the turning extension chamber Pi as the turning scroll 12 turns. May be good.

<Third variant>
FIG. 6 is a cross-sectional view of the compression mechanism portion JC of the compressor according to the third modification.
As shown in FIG. 6, the three injection holes h4a, h4b, and h4c may be provided on the base plate 11a of the fixed scroll 11. Then, in the "compression chamber" including the swivel outer line chamber Po and the swivel extension chamber Pi, the respective injection holes h4a, h4b, h4c may communicate with different "compression chambers". Even with such a configuration, it is possible to appropriately suppress the temperature rise of the refrigerant compressed in the swirling extension chamber Po and the swirling extension chamber Pi.
The number of the plurality of injection holes provided in the base plate 11a of the fixed scroll 11 may be two, or may be four or more.

<Fourth modification>
FIG. 7 is a cross-sectional view of the compression mechanism portion JD of the compressor according to the fourth modification.
In the example shown in FIG. 7, two injection holes h5a and h5b are provided on the base plate 11a of the fixed scroll 11. Of these two injection holes h5a and h5b, one of the injection holes h5a communicates only with the swivel extension chamber Po, and the other injection hole h5b communicates only with the swivel extension chamber Pi. According to such a configuration, the pressure pulsation in the pipe kh (see FIG. 2) for guiding the refrigerant to the injection holes h5a and h5b is suppressed and the refrigerant is injected as compared with the above-described embodiment (see FIG. 3A). It will be easier.

In the configuration of the fourth modification described above, the number of injection holes may be three or more. Then, as the swivel scroll 12 turns, at least one of the plurality of injection holes communicates with the swivel extension chamber Po, but does not communicate with the swivel extension chamber Pi, and the rest of the plurality of injection holes communicates with the swivel extension. It may be configured so as to communicate with the chamber Pi but not to the swivel external line chamber Po.

<Fifth variant>
FIG. 8A is a cross-sectional view of the compression mechanism portion JE of the compressor according to the fifth modification.
In the example shown in FIG. 8A, two injection holes h6a and h6b are provided in the base plate 11a of the fixed scroll 11. Then, as shown in FIG. 8A, at least one of the injection holes h6b communicates with the turning extension chamber Pi immediately after the compression of the refrigerant is started in the turning extension chamber Pi with the turning of the turning scroll 12. As a result, the temperature rise of the refrigerant in the turning extension chamber Pi can be suppressed.

FIG. 8B is a cross-sectional view showing another state in the compression mechanism portion JE of the compressor according to the fifth modification.
When the swivel scroll 12 moves to the predetermined position shown in FIG. 8B, the injection hole h6a communicates with the swivel outside line chamber Po. That is, as the swivel scroll 12 swivels, at least the other injection hole h6a communicates with the swivel outer line chamber Po immediately after the compression of the refrigerant is started in the swivel outer line chamber Po. As a result, the temperature rise of the refrigerant in the swirling outer line chamber Po can be suppressed.

According to the configurations shown in FIGS. 8A and 8B, the refrigerant is injected through the injection holes h6a and h6b at the start of compression when the pressure of the turning extension chamber Pi and the turning outside line chamber Po is relatively low. Therefore, since the pressure in the swirling extension chamber Pi and the swirling extension chamber Po tends to be lower than that on the downstream side of the "condenser", the refrigerant is likely to be injected through the injection holes h6a and h6b.

Immediately after the start of compression of the refrigerant, the refrigerant is injected through the injection holes h6a and h6b. As a result, the compression ratio of the refrigerant in the vicinity of the injection hole h6a and the compression ratio of the refrigerant in the vicinity of the injection hole h6b become substantially equal, so that the pipe kh communicating with the injection holes h6a and hb (see FIG. 2). Pressure pulsation within is suppressed. This makes it easier for the refrigerant to be injected, coupled with the low pressure of the turning extension chamber Pi and the turning outside line chamber Po. As a result, the decomposition of trifluoroiodomethane contained in the refrigerant is suppressed.

The diameters of the injection-side openings in the two injection holes h6a and h6b may be smaller than the wall thickness of the swirl wrap 12b, respectively (see FIGS. 8A and 8B). Then, as the swivel scroll 12 swivels, one injection hole h6b communicates with the swivel extension chamber Pi immediately after compression of the refrigerant is started in the swivel extension chamber Pi, and the other injection hole h6a is closed by the swivel lap 12b. It is preferable that it comes off. Further, as the swivel scroll 12 turns, the other injection hole h6a communicates with the swivel outer line chamber Po immediately after the compression of the refrigerant is started in the swivel outer line chamber Po, and one injection hole h6b is closed by the swivel lap 12b. It is preferable that it comes off. According to such a configuration, even if there is a slight pressure difference between the turning extension chamber Pi and the turning outside line chamber Po, the pressure pulsation in the pipe kh (see FIG. 2) communicating with the injection holes h6a and hb. Is further suppressed. Therefore, the decomposition of trifluoroiodomethane contained in the refrigerant can be appropriately suppressed.

<Other variants>
The configuration of the refrigerant circuit Q shown in FIG. 1 is an example, and is not limited to this. For example, a three-way valve (not shown) may be used instead of the injection valves Va and Vb. Further, instead of the injection valves Va and Vb, a plurality of capillary tubes (not shown) having different flow path resistances are provided, and the capillary tubes through which the refrigerant flows are appropriately provided by "switching means" (not shown). You may switch.

Further, in the embodiment, the case where the compressor 1 is a scroll type compressor has been described, but the present invention is not limited to this. That is, it can be applied to other types of compressors such as rotary type and reciprocating type.

Further, in the embodiment, the air conditioner W (see FIG. 1) in which one outdoor unit Uo and one indoor unit Ui are provided has been described, but the present invention is not limited to this. For example, the embodiment or the like can be applied to a multi-type air conditioner including a plurality of indoor units. Further, as a "refrigeration cycle device" other than the air conditioner W, the embodiment or the like can be applied to a refrigerator, a chiller, a refrigerator, or the like.

Moreover, the embodiment and each modification can be appropriately combined. For example, by combining the embodiment (see FIG. 3A) and the fifth modification (see FIGS. 8A and 8B), the turning extension chamber Pi and the turning outside line chamber Po immediately after the start of compression (fifth modification), 1 The refrigerant may be intermittently and alternately injected through the two injection holes h1 (embodiment).

In addition, each embodiment is described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the configurations described. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.
In addition, the above-mentioned mechanism and configuration show what is considered necessary for explanation, and do not necessarily show all the mechanisms and configurations in the product.

1 Compressor 2 Accumulator 3 Outdoor heat exchanger (condenser / evaporator)
4 Outdoor expansion valve (expansion valve)
5 Indoor expansion valve (expansion valve)
6 Indoor heat exchanger (evaporator / condenser)
7 Four-way valve 8 Discharge temperature sensor 11 Fixed scroll (fixed member)
11a Base plate 11b Fixed wrap 12 Swivel scroll (moving member)
12a Base plate 12b Swivel wrap 13 Frame 14 Crankshaft 18 Electric motor 19 Sealed container h1, h2, h3a, h3b, h4a, h4b, h4c, h5a, h5b, h6a, h6b Injection hole Go Outdoor control circuit (control means)
Gi indoor control circuit (control means)
J, JA, JB, JC, JD, JE Compression mechanism part kg, kh Piping L Refrigerator oil M Suction chamber N Discharge port P Compression chamber Po Swirling outside line chamber (compression chamber)
Pi swivel extension chamber (compression chamber)
Q Refrigerant circuit Va, Vb injection valve (switching means)
W air conditioner (refrigeration cycle device)

In order to solve the above-mentioned problems, the compressor according to the present invention includes a compression mechanism unit that compresses the gaseous refrigerant sucked through the suction chamber in the compression chamber and discharges the compressed refrigerant through the discharge port. The refrigerant includes trifluoroiodomethane, and the refrigerating machine oil is compatible with the refrigerant. The compression mechanism unit includes a fixing member provided with the discharge port and a moving member that forms a compression chamber between the fixing member and the fixing member by its movement. An injection hole is provided to guide the condensed refrigerant to the compression chamber, the fixing member is a fixed scroll having a spiral fixing wrap, and the moving member is a swirling scroll having a spiral swirling wrap. The swivel outer line chamber, which is a space between the outer line side of the swivel scroll and the fixed scroll, functions as the compression chamber and is a space between the inner line side of the swivel scroll and the fixed scroll. The swivel internal line chamber functions as another compression chamber, and the injection hole communicates with at least one of the swivel outer line chamber and the swivel internal line chamber as the swivel scroll turns, and the injection hole is formed by the injection hole. In the fixed scroll, the diameter of the opening on the injection side in the injection hole is larger than the wall thickness of the swivel lap, which is provided on the base plate on which the fixed lap is erected. It is characterized in that the injection hole communicates with both the swivel outer line chamber and the swivel inner line chamber in the process in which the injection hole and the swivel lap partially overlap each other.

Claims (12)

A compression mechanism unit that compresses the gaseous refrigerant sucked through the suction chamber in the compression chamber and discharges the compressed refrigerant through the discharge port.
A closed container that houses at least the compression mechanism and is filled with refrigerating machine oil is provided.
The refrigerant contains trifluoroiodomethane,
The refrigerating machine oil has compatibility with the refrigerant and has a compatibility.
The compression mechanism unit includes a fixing member provided with the discharge port and a moving member that forms a compression chamber between the fixing member by its movement.
The compressor is provided with an injection hole for guiding the condensed refrigerant to the compression chamber in the compression mechanism unit. The fixing member is a fixed scroll having a spiral fixing wrap.
The moving member is a swirl scroll having a swirl swirl lap.
The swivel outer line chamber, which is a space between the outer line side of the swivel scroll and the fixed scroll, functions as the compression chamber and also functions as the compression chamber.
The turning extension chamber, which is a space between the extension side of the turning scroll and the fixed scroll, functions as another compression chamber.
The compressor according to claim 1, wherein the injection hole communicates with at least one of the turning outer line chamber and the turning extension chamber with the turning of the turning scroll. The compressor according to claim 2, wherein the injection hole is provided in a base plate on which the fixed wrap is erected in the fixed scroll. The diameter of the injection-side opening in the injection hole is smaller than the wall thickness of the swirl wrap.
Along with the turning of the swivel scroll, the injection hole is temporarily closed by the swivel lap, and the injection hole communicates with the swivel outer line chamber and the injection hole communicates with the swivel extension chamber. The compressor according to claim 3, wherein the compressors are intermittently and alternately repeated. The diameter of the injection-side opening in the injection hole is larger than the wall thickness of the swirl wrap.
A claim characterized in that, in a process in which the injection hole and the swivel lap partially overlap with each other as the swivel scroll is swiveled, the injection hole communicates with both the swivel outer line chamber and the swivel extension chamber. Item 3. The compressor according to item 3. The base plate of the fixed scroll is provided with a plurality of the injection holes.
The compressor according to claim 3, wherein in the compression chamber including the swivel outer line chamber and the swivel extension chamber, each of the injection holes communicates with a different compression chamber. The base plate of the fixed scroll is provided with a plurality of the injection holes.
With the turning of the swivel scroll, at least one of the plurality of injection holes communicates with the swivel extension chamber, but does not communicate with the swivel extension chamber, and the rest of the plurality of injection holes communicates with the swivel extension chamber. The compressor according to claim 3, wherein the compressor communicates with the extension chamber but does not communicate with the turning outer line chamber. The base plate of the fixed scroll is provided with the two injection holes.
Immediately after the compression of the refrigerant is started in the turning extension chamber with the turning of the turning scroll, at least one of the injection holes communicates with the turning extension chamber.
The compressor according to claim 3, wherein at least one of the injection holes communicates with the swirling outer line chamber immediately after the compression of the refrigerant is started in the swirling outer line chamber as the swivel scroll turns. .. The diameter of the injection-side opening in the two injection holes is smaller than the wall thickness of the swirl wrap, respectively.
Immediately after the compression of the refrigerant is started in the turning extension chamber with the turning of the turning scroll, one of the injection holes communicates with the turning extension chamber, and the other injection hole is closed by the turning lap. ,
Immediately after the compression of the refrigerant is started in the swivel outer line chamber with the swivel of the swivel scroll, the other injection hole communicates with the swivel outer line chamber, and one of the injection holes is closed by the swivel lap. The compressor according to claim 8, wherein the compressor is characterized by the above. It is equipped with a refrigerant circuit in which the refrigerant circulates sequentially through a compressor, a condenser, an expansion valve, and an evaporator.
The compressor
A compression mechanism unit that compresses the gaseous refrigerant sucked through the suction chamber in the compression chamber and discharges the compressed refrigerant through the discharge port.
A closed container that houses at least the compression mechanism and is filled with refrigerating machine oil is provided.
The refrigerant contains trifluoroiodomethane,
The refrigerating machine oil has compatibility with the refrigerant and has a compatibility.
The compression mechanism unit includes a fixing member provided with the discharge port and a moving member that forms a compression chamber between the fixing member by its movement.
A refrigeration cycle device provided with an injection hole for guiding the condensed refrigerant to the compression chamber in the compression mechanism unit. A discharge temperature sensor that detects the temperature of the refrigerant discharged from the compressor, and
A switching means provided in a pipe for guiding the refrigerant to the injection hole to switch the flow / cutoff of the refrigerant through the pipe,
When the detection value of the discharge temperature sensor becomes equal to or higher than a predetermined value, the control means for switching the switching means so that the refrigerant sequentially flows through the pipe and the injection hole is provided. The refrigeration cycle apparatus according to claim 10. The refrigerating cycle apparatus according to claim 10 or 11, wherein the refrigerating machine oil is a polyol ester oil or a polyvinyl ether oil.

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