JP7345131B2 - compressor - Google Patents

Description

The present invention relates to a compressor and a refrigeration cycle device using the same, and particularly to a compressor and a refrigeration cycle device suitable for using a working medium containing an ethylene fluorohydrocarbon having a double bond such as HFO1123.

In general, refrigeration cycle devices such as air conditioners are constructed by connecting a compressor, if necessary, a four-way valve, a radiator (or condenser), a pressure reducer such as a capillary tube or an expansion valve, an evaporator, etc. A cooling or heating effect is performed by configuring a cycle and circulating a working medium (refrigerant) inside the cycle.

As the working medium in these refrigeration cycle devices, fluorocarbons (fluorocarbons are specified by the US ASHRAE34 standard to be written as R○○ or R○○○.Hereinafter, they will be referred to as R○○ or R○○○. Halogenated hydrocarbons derived from methane or ethane called methane or ethane are known.

Although R410A is often used as a working fluid for refrigeration cycle devices as described above, the global warming potential (GWP) of R410A refrigerant is as large as 2090, which poses a problem from the perspective of preventing global warming.

Therefore, from the perspective of preventing global warming, working media containing ethylene-based fluorinated hydrocarbons having double bonds, such as HFO1123 (1,1,2-trifluoroethylene), are recommended as working media with low GWP. HFO1132 (1,2-difluoroethylene) has been proposed (see, for example, Patent Document 1 or Patent Document 2).

International Publication No. 2012/157764 International Publication No. 2012/157765

However, HFO1123 (1,1,2-trifluoroethylene) and HFO1132 (1,2-difluoroethylene) have lower stability than conventional working fluids such as R410A, and when they generate radicals, they self-decompose. There is a possibility that it may change into another compound due to reaction. Self-decomposition reactions cause a pressure increase accompanied by large heat release, which may reduce the reliability of compressors and refrigeration cycle equipment. Therefore, when HFO1123 or HFO1132 is used in a compressor or a refrigeration cycle device, it is necessary to suppress this self-decomposition reaction.

Such a self-decomposition reaction starts when high energy is applied in an atmosphere of excessively high temperature and pressure.

For example, the discharge pressure (on the high pressure side of the refrigeration cycle) increases excessively under conditions other than normal operating conditions, such as when the blower fan on the condenser side stops or the refrigeration cycle circuit is blocked.

Under these conditions, the compressor locks abnormally, and if power continues to be supplied to the compressor even under this lock abnormality, excessive power will be supplied to the compressor's motor, causing the motor to generate abnormal heat. . As a result, the insulation of the stator windings that make up the motor's stator melts and breaks down, causing a phenomenon called layer short between conductors, which becomes a source of high energy and induces a self-decomposition reaction.

When the disproportionation autolysis reaction occurs, the pressure within the compressor may rise abnormally, which may reduce the reliability of the compressor.

The present invention was made in view of the above points, and is a compressor and refrigeration cycle device using a working medium containing an ethylene fluorinated hydrocarbon having a double bond such as HFO1123. The purpose is to make it high.

In order to achieve the above object, the present invention provides a compressor that includes a partition wall for isolating a current-carrying part of a motor element from a working fluid, so that the current-carrying part is placed under a fluid having a composition different from that of the working fluid. The configuration is as follows. The refrigeration cycle device is configured using the compressor described above.

As a result, the current-carrying part is located in an environment with different components or composition from the working fluid, so even if a layer short occurs in the current-carrying part of the motor element of a compressor that compresses a refrigerant containing HFO1123 as the working fluid, for example, , it is possible to avoid adding high energy to the working fluid, and it is possible to prevent the working fluid from causing a self-decomposition reaction. In addition, the safety and reliability of the refrigeration cycle device can be improved.

In the present invention, with the above configuration, even if a layer short occurs in the current-carrying part of the electric motor element of the compressor, it is possible to avoid adding high energy to the working fluid, so that the working fluid undergoes self-decomposition reaction. Even if a working medium containing an ethylene-based fluorinated hydrocarbon having a double bond such as HFO1123 is used, the safety and reliability of a compressor and a refrigeration cycle device using the same can be made high. be able to.

Schematic configuration diagram of a compressor in Embodiment 1 of the present invention Schematic configuration diagram of a compressor in Embodiments 2 and 3 of the present invention Schematic configuration diagram of a compressor in Embodiment 4 of the present invention Schematic configuration diagram of a compressor in Embodiment 5 of the present invention Schematic configuration diagram of a compressor in Embodiment 6 of the present invention Refrigeration cycle diagram of an air conditioner in Embodiment 9 of the present invention A schematic cross-sectional view showing the indoor unit of the air conditioner

A first invention is a compressor, which includes a compression mechanism that compresses a working fluid and an electric motor element that drives the compression mechanism, and a stator winding in the electric motor element and a power supply to the stator winding. The current-carrying parts such as the parts are isolated from the working fluid by a partition wall, and the current-carrying parts are installed in an environment having a different component or composition from the working fluid.

As a result, the current-carrying part is located in an environment with different components or composition from the working fluid, so even if a layer short occurs in the current-carrying part of the motor element of the compressor, high energy is added to the working fluid. For example, even when a working fluid containing HFO1123 is used, it is possible to prevent the working fluid from causing a self-decomposition reaction. That is, even if a working medium containing an ethylene-based fluorohydrocarbon having a double bond such as HFO1123 is used, the safety and reliability of the compressor can be made high.

A second aspect of the present invention is a configuration in which a partition wall is provided between the compression mechanism section and the electric motor element and between the electric mechanism element and the atmospheric atmosphere to isolate the electric motor element from the working fluid. It is said that

As a result, as in the first invention, even if a layer short occurs in the current-carrying part of the motor element, it is possible to avoid adding high energy to the working fluid, thereby increasing the safety and reliability of the compressor. can be taken as a thing. Furthermore, it is not necessary to provide a partition wall between the stator and rotor of the motor element in order to isolate the current-carrying portion of the motor element from the working fluid. Therefore, the distance between the motor stator and the rotor can be maintained as small as it currently is, and the efficiency of the motor can be increased. Further, since the rotor can be prevented from coming into contact with droplets of working fluid or lubricating oil by the partition wall that is isolated from the compression mechanism, stirring loss can also be suppressed. Furthermore, if the coefficient of thermal expansion of the gas or liquid in the environment in which the electric motor element is installed in the partition wall is set to the same level as the working fluid on the side where the compression mechanism is installed, the pressure of the gas or liquid in the partition wall during compression operation can be reduced. The pressure can be made close to the working fluid pressure on the compression mechanism side, reducing the pressure difference between the working fluid and the environment inside the bulkhead, and suppressing sliding loss and viscous loss that occur at the sealing part of the bulkhead. .

A third aspect of the present invention is based on the first aspect, in which the electric motor element is housed together with the compression mechanism in a closed container, and a partition wall is installed to isolate the current-carrying portion of the electric motor element from the working fluid.

This makes it possible to isolate the energized part of the motor element from the working fluid while the motor element is housed together with the compression mechanism in a sealed container, thereby avoiding the addition of high energy to the working fluid, thereby increasing the safety of the compressor. and reliability can be made high.

A fourth invention is based on the third invention, wherein the partition wall rises from the outer circumferential side and the inner circumferential side of the upper end surface or the lower end surface of the stator laminated plate in the stator, and extends from the upper and lower coil end portions of the stator winding, respectively. The current-carrying portion is individually covered so as to be isolated from the working fluid.

Thereby, the partition wall that isolates the current-carrying portion from the working fluid can be concentrated above the upper end surface of the motor laminate or below the lower end surface of the motor laminate. Therefore, there is no need to isolate the current-carrying parts by, for example, providing a partition between the stator and rotor of the electric motor element, and the distance between the stator and rotor of the electric motor can be kept small. This makes it possible to maintain high motor efficiency while improving the reliability of the compressor.

A fifth invention is based on the third or fourth invention, wherein the partition wall integrally isolates a stator including a stator laminated plate of the motor element, a stator winding, a current-carrying part such as a power supply part, etc. from the working fluid. In order to do this, the current-carrying part is isolated from the working fluid.

This allows the partition wall to have a simpler structure. Further, when sealing the partition wall that covers the current-carrying portion of the motor element, the joining is facilitated because the same materials are joined.

A sixth invention is based on the first invention, wherein a partition is provided between the stator and the rotor of the electric motor element, and the stator and stator windings of the electric motor element, current-carrying parts such as a power supply part are placed in an atmospheric environment. It is configured so that it is installed at the bottom.

This makes it possible to radiate heat from the motor stator to the atmosphere while suppressing refrigerant leakage, thereby improving the efficiency and reliability of the motor elements.

According to a seventh invention, in the first invention, a partition is provided between the compression mechanism section and the electric motor element, and the electric motor element is installed in an atmospheric atmosphere.

As a result, the motor elements can be installed in the atmosphere without partially isolating current-carrying parts such as the stator, stator windings, and power supply parts from the rotor. While doing so, the distance between the motor stator and rotor can be reduced, and the efficiency of the motor can be improved.

According to an eighth aspect of the present invention, in the first to fifth aspects of the present invention, the environment in which the current-carrying portion of the motor element is installed is a gas atmosphere.

As a result, the electrical insulation of the environment surrounding the motor increases, and the influence of electrical input due to layer shorts, for example, can be kept to a very small area.

A ninth aspect of the invention is that in the first to fifth aspects, the environment in which the current-carrying part of the motor element is installed is in a liquid.

As a result, the heat capacity of the environment surrounding the motor increases, and the influence of temperature rise caused by high energy addition due to layer shorts, for example, can be absorbed in a very small area.

A tenth invention is that in the first to fifth inventions, the environment in which the motor element is installed is sealed in a partition wall with a gas or liquid containing an element or molecule whose valence or outermost electron is a closed shell. The structure was constructed using the following methods.

As a result, even if a layer short occurs in the current-carrying portion of the motor element of the compressor, it is possible to avoid adding high energy to the working fluid, thereby preventing the working fluid from causing a self-decomposition reaction. In other words, even if a layer short occurs in the current-carrying part of the motor element of the compressor, the inside of the partition where the motor element is installed is in an inert environment, so the motor element will be damaged due to the high energy added during the layer short. It is possible to suppress the reaction of the surrounding environment. Therefore, even if a working medium containing an ethylene fluorinated hydrocarbon having a double bond such as HFO1123 is used, the safety and reliability of the compressor can be improved.

According to an eleventh invention, in the first to fifth inventions, the environment in which the electric motor element is installed is constructed by sealing a gas or liquid containing a Group 18 element in the partition wall.

As a result, like the tenth invention, even if a layer short occurs in the current-carrying part of the electric motor element of the compressor, it is possible to avoid adding high energy to the working fluid, so that the working fluid undergoes a self-decomposition reaction. can be prevented from occurring. In addition, even if a layer short occurs in the current-carrying part of the motor element of the compressor, the inside of the bulkhead where the motor element is installed is an inert environment, so the area around the motor element due to the addition of high energy when the layer short occurs. Environmental reactions can be suppressed, and the safety and reliability of the compressor can be increased.

A twelfth invention is that in the first to fifth, tenth, or eleventh inventions, the environment in which the electric motor element is installed is constructed by sealing a gas or liquid containing nitrogen or carbon dioxide in the partition wall. It is said that

As a result, like the tenth invention, even if a layer short occurs in the current-carrying part of the electric motor element of the compressor, it is possible to avoid adding high energy to the working fluid, so that the working fluid undergoes a self-decomposition reaction. can be prevented from occurring. Furthermore, the inertization of the environment surrounding the motor element can be constructed from inexpensive gases or liquids.

A thirteenth invention is the first to fifth or eighth to twelfth inventions, wherein the environment in which the electric motor element is installed has a thermal conductivity of 0.001 to 0.3 [W/mK] under atmospheric pressure. The structure is constructed by sealing a gas within the partition wall.

Thereby, heat dissipation from the motor element can be performed more efficiently.

A fourteenth invention is the first to fifth or eighth to thirteenth inventions, wherein the environment in which the electric motor element is installed has a thermal conductivity of 0.05 to 0.7 [W/mK] under atmospheric pressure. The structure is constructed by sealing a liquid within the partition wall.

Thereby, similarly to the thirteenth invention, heat radiation from the electric motor element can be performed more efficiently.

A fifteenth invention is a refrigeration cycle device, and the refrigeration cycle device includes a compressor, a condenser, an expansion valve, and an evaporator connected in a ring to form a refrigeration cycle circuit. A working fluid containing a refrigerant gas containing a double bond and two carbon atoms is sealed in the compressor, and the compressor is configured to be the compressor according to any one of the first to fourteenth inventions.

Thereby, both the compressor and the refrigeration cycle device can be made highly safe.

Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to this embodiment.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a compressor according to Embodiment 1 of the present invention.

The compressor of this embodiment is configured by providing a motor element 2 and a compression mechanism section 3 in a closed container 1. The airtight container 1 is connected to a refrigeration cycle device such as an air conditioner through a suction pipe (not shown) and a discharge pipe (not shown).

The compression mechanism section 3 is arranged at the upper part of the closed container 1, and the electric motor element 2 is arranged at the lower part of the compression mechanism section 3. The electric motor element 2 and the compression mechanism section 3 are connected by a rotating shaft 4.

The electric motor element 2 is constituted by a concentrated winding DC brushless motor including a stator 5 and a rotor 6. The stator 5 is constructed by winding a winding 7 around a stator core formed by laminating stator laminated plates, and is energized by an inverter circuit (not shown) and driven by the inverter. The rotor 6 is fixed to the rotating shaft 4 and rotates together with the rotating shaft 4.

The compression mechanism section 3 is constituted by, for example, a double rotary type compression mechanism, and a rolling piston (not shown) is rotationally driven by the rotation of the rotating shaft 4, and sucks in and compresses the working medium.

A power supply terminal 8 is provided at a suitable location in the airtight container 1, and current is passed through the stator winding 7 via a power supply part 9 such as a lead wire. The power feeding section 9 and the winding 7 serve as a current conducting section 10 of the motor element 2.

Here, the compressor is provided with a partition wall 11 for isolating the current-carrying part 10 of the electric motor element 2 from the working fluid in a portion of the airtight container 1 where the compression mechanism part 3 is provided. The working fluid is configured to be installed in an environment having a different component or composition from the working fluid. For example, in this example, a partition wall 11 is provided between the electric motor element 2 and the compression mechanism section 3 to isolate the winding 7 of the stator 5 and the power feeding section 9, that is, the current conducting section 10 from the working fluid. A partition wall 11a is also provided between the electric motor element 2 and the atmosphere, and the housing portion of the electric motor element 2 having the current-carrying part 10 is hermetically sealed. In this example, since the motor element 2 is provided inside the closed container 1, the bottom wall of the closed container 1 serves as a partition wall, and the partition wall 11a is not necessarily required.

Next, the functions and effects of the compressor configured as described above will be explained.

When the motor element 2 is energized from the inverter circuit section via the terminal 8, current flows through the winding 7 of the stator 5, a magnetic field is generated, and the rotating shaft 4 rotates. When the rotating shaft 4 rotates, an eccentric shaft portion (not shown) of the rotating shaft 4 rotates a rolling piston (not shown) to repeatedly suck and compress the working medium, thereby performing a predetermined compression operation.

Here, a working medium containing an ethylene-based fluorinated hydrocarbon having a double bond is used as a working medium of the compressor, specifically a refrigerant containing HFO1123 (1,1,2-trifluoroethylene), When conditions other than normal operating conditions occur, for example, the blower fan on the condenser side stops, the refrigeration cycle circuit is blocked, etc., the discharge pressure (on the high pressure side of the refrigeration cycle) increases excessively.

Under such conditions, a lock abnormality occurs in the compressor, and if power continues to be supplied to the compressor even under this lock abnormality, excessive power is supplied to the motor element 2 of the compressor, causing the motor element 2 to I get an abnormal fever. As a result, the insulation of the winding 7 constituting the stator 5 is melted and destroyed, causing a layer short between the conducting wires. At this time, since the current-carrying part 10 consisting of the winding 7 of the motor element 2 and the power supply part 9 is isolated from the working fluid by the partition wall 11, layer shorts do not become a source of high energy to the working fluid, and the working fluid can be prevented from causing a self-decomposition reaction.

In other words, even if the electric motor element 2 is housed in the airtight container 1 together with the compression mechanism part 3 in the same form as before, the current-carrying part 10 in the stator 5 of the electric motor element 2 is reliably isolated from the working fluid, and the compressor The safety and reliability of the system can be improved.

Furthermore, it is not necessary to provide a partition wall 11 between the stator 5 and rotor 6 of the electric motor element 2 in order to isolate the current-carrying portion 10 of the electric motor element 2 from the working fluid. Therefore, the distance between the stator 5 and the rotor 6 of the electric motor element 2 can be maintained as small as it is, and the efficiency of the electric motor element 2 can be maintained high without decreasing.

In addition, the partition wall 11 separating the compression mechanism section 3 can prevent the rotor 6 from coming into contact with droplets of working fluid or lubricating oil, so that stirring loss can also be suppressed.

Furthermore, if the coefficient of thermal expansion of the gas or liquid in the environment in which the electric motor element is installed in the partition wall 11 is set to the same level as that of the working fluid on the side where the compression mechanism is installed, the pressure of the gas or liquid in the partition wall during compression operation can be increased. can be brought to a pressure close to the working fluid pressure on the compression mechanism side, reducing the pressure difference between the working fluid and the environment inside the partition wall, and suppressing sliding loss and viscous loss occurring at the sealing part of the partition wall 11. You can also do it. For example, when the working medium is a refrigerant containing HFO1123 (1,1,2-trifluoroethylene), it is preferable that the gas or liquid in the environment in which the motor element is installed is R32.

(Embodiment 2)
FIG. 2 is a schematic configuration diagram of a compressor according to a second embodiment. In the configuration of this embodiment, a motor element 2 and a compression mechanism section 3 are provided in a closed container 1, as in the first embodiment. The current-carrying part 10 consisting of the winding 7 of the stator 5 constituting the element 2, the bare coil end part 7a, and the power supply part 9 is covered with a partition wall 11 to isolate the current-carrying part 10 from the working fluid in the closed container 1. ing.

Also in this embodiment, the current-carrying portion 10 in the stator 5 of the motor element 2 can be reliably isolated from the working fluid while the motor element 2 is housed in the closed container 1 together with the compression mechanism portion 3. Therefore, even if a layer short occurs in the current-carrying section 10, since the current-carrying section 10 is isolated from the working fluid, the layer short will not become a source of high energy to the working fluid, and the working fluid will not undergo a self-decomposition reaction. It is possible to prevent this from happening.

Further, since the rotor 6 can be prevented from coming into contact with droplets of working fluid or lubricating oil, stirring loss can also be suppressed.

Note that in this embodiment, the environment inside the partition wall may be in a negative pressure state lower than atmospheric pressure, or may be filled with the atmosphere, and as long as it is isolated from the working fluid, it falls within the scope of this embodiment. It is something that goes into.

(Embodiment 3)
The compressor of the third embodiment has a structure in which the partition walls 11 shown in FIG. 2 are individually provided on the upper and lower end surfaces of the laminated plates of the stator 5 to isolate the current-carrying portion 10 from the working fluid. That is, the partition wall 11 is formed into a substantially U-shaped cross section with rising walls on the outer and inner circumferential sides of a donut-shaped plate, and is joined to the upper and lower end surfaces of the stator laminated plate of the stator 5.

As a result, even if the electric motor element 2 is housed in the airtight container 1 together with the compression mechanism section 3 as in the first and second embodiments, the electric motor element 2 can be removed as described in the second embodiment. The power feeding part 9 of the current carrying part 10, the winding 7, and its coil end part 7a can be covered with the partition wall 11 and isolated from the working fluid. Therefore, even if a layer short occurs in the current-carrying section 10, since the current-carrying section 10 is isolated from the working fluid, the layer short will not become a source of high energy to the working fluid, and the working fluid will not undergo a self-decomposition reaction. It is possible to prevent this from happening.

Further, as in the first embodiment, it is not necessary to provide a partition wall 11 between the stator 5 and rotor 6 of the electric motor element 2, so the distance between the rotor 6 and stator 5 can be reduced. Since the efficiency of the motor element 2 can be maintained at a high level by leaving the rotor 6 alone, and the rotor 6 can be prevented from coming into contact with droplets of working fluid or lubricating oil, stirring loss can also be suppressed.

In this embodiment, the partition wall 11 and the stator laminated plate may be joined by, for example, welding, press-fitting, or caulking, as long as the inside of the partition wall and the working fluid can be isolated and mixing of the fluids can be prevented. Further, the environment within the partition wall may be in a state of negative pressure lower than atmospheric pressure, for example, or the atmosphere may be enclosed, and as long as it is isolated from the working fluid, it falls within the scope of this embodiment. .

(Embodiment 4)
FIG. 3 is a schematic configuration diagram of a compressor according to Embodiment 4. In the configuration of this embodiment, a partition wall 11 is installed to integrally isolate the entire stator 5 including the stator laminate and the current-carrying section 10 from the working fluid. The structure is as follows. That is, the individual partition walls 11 bonded to the upper and lower end surfaces of the stator laminate described in the third embodiment are integrated, and a part of the partition walls 11 are also formed between the rotor 6 and the stator 5. This is where it will be located.

As a result, even if the electric motor element 2 is housed in the airtight container 1 together with the compression mechanism part 3, as in each of the embodiments described above, the current-carrying part 10 in the electric motor element 2 is covered with the partition wall 11, and the working fluid is The current-carrying section 10 can be isolated from the surrounding air. Therefore, even if a layer short occurs in the current-carrying section 10, since the current-carrying section 10 is isolated from the working fluid, the layer short will not become a source of high energy to the working fluid, and the working fluid will not undergo a self-decomposition reaction. It is possible to prevent this from happening.

Note that the other effects are the same as those in Embodiment 1, and their explanation will be omitted.

(Embodiment 5)
FIG. 4 is a schematic configuration diagram of a compressor according to Embodiment 5. In this embodiment, the compression mechanism section 3 and the rotor 6 of the electric motor element 2 are installed under the working fluid, and the stator 5 of the electric motor element 2 and the energized The section 10 is installed in an atmospheric atmosphere and isolated from the working fluid by a partition wall 11. That is, the rotor 6 of the electric motor element 2 is housed in the closed container 1 together with the compression mechanism part 3 and installed under the working fluid, and the stator 5 and the current-carrying part 10 other than the rotor 6 of the electric motor element 2 are connected to the partition wall 11. The structure is such that it is installed in an atmospheric atmosphere isolated from the working fluid by the wall of the sealed container 1.

In this embodiment, the stator 5 and the current-carrying section 10 of the electric motor element 2 are installed in the atmospheric atmosphere, so even if a layer short occurs in the current-carrying section 10, the current-carrying section 10 is not exposed to the atmospheric atmosphere. Since the layer is isolated from the working fluid, a layer short does not become a source of high energy to the working fluid, and it is possible to prevent the working fluid from causing a self-decomposition reaction.

Further, since the stator 5 of the electric motor element 2 is located in the atmosphere, the stator 5 can radiate heat to the atmosphere, so that an increase in stator temperature can be suppressed. Therefore, while keeping the efficiency of the motor element 2 high, it is possible to suppress the occurrence of layer shorts.

Further, since the rotating shaft 4 does not penetrate the partition wall 11 and there is no need to provide a seal portion on the partition wall 11, it is possible to suppress sliding loss and minute leakage of refrigerant due to sealing.

Thereby, the safety of the compressor can be increased.

Note that in this embodiment, the humidity of the atmosphere around the current-carrying part may be any value, water droplets such as rainwater may be attached to the motor element, and the volume ratio of gas to liquid may be gas>liquid. This falls within the scope of this embodiment.

(Embodiment 6)
FIG. 5 is a schematic configuration diagram of a compressor according to a sixth embodiment. In this embodiment, only the compression mechanism section 3 is housed in a closed container 1 and installed under the working fluid, and the electric motor element 2 has a current-carrying section 10. The entire system including the compressor is installed in an atmospheric pressure atmosphere separated from the working fluid by a partition wall 11 formed from the wall surface of the closed container 1, and the compression mechanism section 3 and the rotor 6 receive power via the rotating shaft 4 passing through the partition wall 11. The structure is designed to communicate.

Also in this embodiment, the stator 5 and the current-carrying part 10 of the motor element 2 are installed in the atmospheric atmosphere, so even if a layer short occurs in the current-carrying part 10, the current-carrying part 10 is not exposed to the atmospheric atmosphere. Since the layer is isolated from the working fluid, a layer short does not become a source of high energy to the working fluid, and it is possible to prevent the working fluid from causing a self-decomposition reaction.

Further, since the stator 5 of the electric motor element 2 is located in the atmosphere, the stator 5 can radiate heat to the atmosphere, thereby suppressing a rise in stator temperature. Therefore, it is possible to keep the efficiency of the electric motor high while also suppressing the occurrence of layer shorts.

In addition, there is no partition wall 11 between the rotor 6 and stator 5, and the distance between the rotor 6 and stator 5 can be reduced, so the efficiency of the electric motor can be kept high, and working fluid and lubricating oil can be maintained. It is also possible to suppress the occurrence of agitation loss due to a rise in the liquid level in a closed container of , or a mixture thereof.

Note that it is necessary to provide a hole in the partition wall 11 through which the rotating shaft 4 passes, and to provide a sealing mechanism in the hole to prevent leakage of the refrigerant, but the sealing mechanism may be a contact mechanism such as an O-ring, or a non-contact mechanism such as a labyrinth seal. It may also be a contact item.

Further, in this embodiment, the humidity of the atmosphere around the current-carrying part may be any value, water droplets such as rainwater may adhere to the motor element, and the volume ratio of gas to liquid may be gas>liquid. This falls within the scope of this embodiment.

(Embodiment 7)
The compressor in Embodiment 7 has a structure in which the environment inside the partition wall isolating the current-carrying portion 10 of the motor element 2 described in Embodiments 1 to 5 is made up of valences or outermost electrons in a closed shell. The atmosphere is a gas containing a group 18 element or a group 18 element, such as argon gas.

In this embodiment as well, it is possible to prevent the working fluid from causing a self-decomposition reaction, but furthermore, in this embodiment, since the current-carrying part 10 is in a gas atmosphere, it is possible to prevent the working fluid from causing a self-decomposition reaction. Since the environment surrounding the motor has great electrical insulation, the influence of electrical input can be kept to a very small area.

Thereby, the safety and reliability of the compressor can be improved.

In this embodiment, the current-carrying part 10 may be in a gas atmosphere with a dryness of less than 1.0, and the gas may be a mixture of several types of gas or a mixture of impurity gases. However, if the volume ratio of gas exceeds the volume ratio of liquid in the environment around the current-carrying part, it falls within the scope of this embodiment.

(Embodiment 8)
The compressor in Embodiment 8 has a structure in which the environment within the partition wall isolating the current-carrying portion 10 of the motor element 2 described in Embodiments 1 to 5 is a closed shell of valence or outermost shell electrons. The liquid environment is a liquid containing elements or molecules of Group 18, or a liquid environment containing Group 18 elements.

In this embodiment as well, it is possible to prevent the working fluid from causing a self-decomposition reaction, but furthermore, in this embodiment, since the current-carrying part 10 is in a liquid environment, it is possible to prevent the working fluid from causing a self-decomposition reaction. Since the heat capacity of the environment surrounding the motor is large, the effect of temperature rise due to high energy addition can be absorbed in a very small area.

Thereby, the safety and reliability of the compressor can be improved.

Note that in this embodiment, the current-carrying unit 10 may be under a liquid whose dryness is 0 or more, and the liquid may be a mixed liquid such as a mixture of different liquids or an impurity liquid. Generally, if the volume ratio of liquid in the environment around the current-carrying part exceeds the volume ratio of gas, it falls within the scope of this embodiment.

Here, the environment surrounding the electric motor may be a gas containing nitrogen or carbon dioxide, or a liquid, other than those shown in the seventh and eighth embodiments.

Further, the gas or liquid constituting the environment surrounding the electric motor is a gas having a thermal conductivity of 0.001 to 0.3 [W/mK] at atmospheric pressure, or a gas having a thermal conductivity of 0.05 at atmospheric pressure. It is preferable to use a liquid having a power of ~0.7 [W/mK].

By doing this, the heat dissipation effect of the stator 5 increases, making it possible to suppress the temperature of the stator winding below the temperature at which its insulation coating melts, and also preventing the occurrence of layer shorts. can. Therefore, the safety of the compressor can be made higher.

(Embodiment 9)
Embodiment 9 shows a refrigeration cycle device, and this example shows an air conditioner configured using the compressor described in each of the above embodiments. FIG. 6 is a refrigeration cycle diagram of the air conditioner, and FIG. 7 is a schematic sectional view showing an indoor unit of the air conditioner.

6 and 7, this air conditioner includes an outdoor unit 51 and an indoor unit 52 connected to the outdoor unit 51. The outdoor unit 51 includes a compressor 53 that compresses the refrigerant, a four-way valve 54 that switches the refrigerant circuit during cooling/heating operation, an outdoor heat exchanger 55 that exchanges heat between the refrigerant and the outside air, a pressure reducer 56 that reduces the pressure of the refrigerant, and an outdoor A blower 59 is provided. Further, the indoor unit 52 is provided with an indoor heat exchanger 57 that exchanges heat between the refrigerant and indoor air, and an indoor blower 58. The compressor 53, four-way valve 54, indoor heat exchanger 57, pressure reducer 56, and outdoor heat exchanger 55 are connected through a refrigerant circuit to form a heat pump type refrigeration cycle.

Note that the refrigerant circuit according to the present embodiment uses a refrigerant in which a working medium containing an ethylene-based fluorohydrocarbon having a double bond such as HFO1123 is used alone or in a two-component mixture or a three-component mixture.

In the air conditioner having the above configuration, during cooling operation, the four-way valve 54 is switched so that the discharge side of the compressor 53 and the outdoor heat exchanger 55 communicate with each other. As a result, the refrigerant compressed by the compressor 53 becomes a high-temperature, high-pressure refrigerant and is sent to the outdoor heat exchanger 55 through the four-way valve 54. The refrigerant then exchanges heat with the outside air to radiate heat, becomes a high-pressure liquid refrigerant, and is sent to the pressure reducer 56. The pressure is reduced in the pressure reducer 56 to become a low-temperature, low-pressure two-phase refrigerant, which is sent to the indoor unit 52. In the indoor unit 52, the refrigerant enters the indoor heat exchanger 57, exchanges heat with indoor air, absorbs heat, and evaporates into a low-temperature gas refrigerant. At this time, the indoor air is cooled to cool the room. Furthermore, the refrigerant returns to the outdoor unit 51 and is returned to the compressor 53 via the four-way valve 54.

During heating operation, the four-way valve 54 is switched so that the discharge side of the compressor 53 and the indoor unit 52 communicate with each other. As a result, the refrigerant compressed by the compressor 53 becomes a high-temperature, high-pressure refrigerant and is sent to the indoor unit 52 through the four-way valve 54 . The high-temperature, high-pressure refrigerant enters the indoor heat exchanger 57, exchanges heat with indoor air, radiates heat, and is cooled to become a high-pressure liquid refrigerant. At this time, the indoor air is heated to heat the room. Thereafter, the refrigerant is sent to the pressure reducer 56, where it is depressurized to become a low-temperature, low-pressure two-phase refrigerant.The refrigerant is sent to the outdoor heat exchanger 55, where it is evaporated by exchanging heat with the outside air, and passed through the four-way valve 54. and is returned to the compressor 53.

In the air conditioner configured as described above, by using the compressor 53 as the compressor shown in each of the above embodiments, even when using a working fluid containing HFO1123, the working fluid is self-sufficient. It is possible to prevent a decomposition reaction from occurring and provide a highly safe and reliable refrigeration system.

Although the compressor of the present invention and the refrigeration cycle device using the same have been described above using the above embodiments, the present invention is not limited thereto.

For example, in the present embodiment, a rotary compressor having a double compression mechanism is used as the compression mechanism 3, but this is a rotary compressor having one compression mechanism. Alternatively, the compressor may be of any other type, such as a positive displacement compressor such as a scroll type or a reciprocating type, or a centrifugal type compressor.

Moreover, although the electric motor element 2 has been described using an inner rotor type electric motor as an example, in a case like the sixth embodiment, an outer rotor type electric motor element can also be applied.

Furthermore, although Embodiments 1 to 6 have been illustrated as configurations for isolating the current-carrying section 10 from the working fluid, these may be used in any appropriate combination, thereby more reliably isolating the current-carrying section 10 from the working fluid. It is possible and suitable.

In addition, we have explained an air conditioner as an example of a refrigeration cycle device, but this is a refrigeration system in which components such as a compressor, condenser, expansion means, and evaporator are connected via piping, and has an outdoor unit. The specific example of application is not particularly limited as long as it is a cycle device, and for example, it may be a heat pump water heater or the like.

As described above, the present invention can provide a compressor and a refrigeration cycle device that are safe even when a working medium containing an ethylene-based fluorohydrocarbon having a double bond, such as HFO1123, is used as the working medium. Therefore, it can be widely applied to various compressors and refrigeration cycle devices using the compressors.

1 Airtight container 2 Electric motor element 3 Compression mechanism section 4 Rotating shaft 5 Stator 6 Rotor 7 Winding 7a Coil end section 8 Terminal 9 Power supply section 10 Current carrying section 11, 11a Partition wall 51 Outdoor unit 52 Indoor unit 53 Compressor 54 Four-way valve 55 Outdoor heat exchanger 56 Pressure reducer 57 Indoor heat exchanger 58 Indoor blower 59 Outdoor blower

Claims (2)

comprising a compression mechanism that compresses a working fluid and an electric motor element that drives the compression mechanism,
the electric motor element comprises a stator and a rotor;
The stator is configured by winding a winding around a stator core configured by laminating stator laminate plates,
Isolating the winding and a current-carrying part such as a power supply part to the winding from the working fluid by a partition,
A compressor in which the winding and the current-carrying part are installed in an environment having a different component or composition from the working fluid,
The partition wall is formed into a substantially U-shaped cross section with rising walls on the outer circumferential side and the inner circumferential side of the donut-shaped plate,
The partition walls were individually bonded to the upper and lower end surfaces of the stator laminate.
A compressor characterized by : The compressor according to claim 1 , wherein the environment in which the current - carrying portion of the motor element is installed is a gas atmosphere.

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