JP7269829B2 - Compressor and refrigeration cycle equipment - Google Patents

Description

The present invention relates to compressors and refrigeration cycle devices.

A protective device is known in which a terminal cover that houses a sealed terminal is attached to the outer wall of a compressor via a gasket.

Japanese Unexamined Patent Application Publication No. 2002-5019

In order to prevent global warming, the use of natural refrigerants with a low global warming potential (GWP) is gaining momentum. Therefore, in refrigeration cycle apparatuses, the application of hydrocarbon-based (HC-based) refrigerants is being promoted. HC-based refrigerants include flammable refrigerants such as propane.

When using electrical equipment in a flammable atmosphere, the specifications of the explosion-proof structure must comply with the "Explosion-proof Guidelines for Factory Electrical Equipment (International Harmonized Explosion-proof Guidelines 2015)" based on Article 5 of the "Electrical Equipment Explosion-proof Structural Standards". Formulated. The "Explosion-proof Guidelines for Factory Electrical Equipment (International Harmonized Explosion-proof Guidelines 2015)" is a standard that conforms to the IEC80079 series established by the International Electrotechnical Commission.

The connecting portion between the sealed terminal and the lead wire is not connected/disconnected while the compressor is running (while the power is on). Also, the inside of the cover that covers the connecting portion between the sealed terminal and the lead wire does not become a flammable atmosphere during normal operation. In other words, the inside of the cover is a Class 2 hazardous area. Therefore, the connection point between the sealed terminal and the lead wire or the cover that covers them can be regarded as a structure equivalent to the non-sparking type, and the specification of the explosion-proof structure can be established.

However, in an unsteady state, such as when a flammable refrigerant leaks from the closed container of the compressor, overheating due to loosened terminals may become a fire source. If a flammable refrigerant ignites inside the cover, the flame propagates through the gap in the cover for the lead wire to pass through, or through the gap in the bushing provided between the lead wire and the cover, causing the surrounding flammable refrigerant to ignite. The refrigerant may catch fire.

Therefore, the present invention provides an explosion-proof structure that can keep the flame inside the cover without affecting the outside of the cover even if a combustible refrigerant ignites inside the cover. It is an object of the present invention to provide a hermetic compressor and a refrigerating cycle device.

In order to solve the above-described problems, a hermetic compressor according to an embodiment of the present invention includes a hermetic container, a compression mechanism part accommodated in the hermetic container and capable of compressing a refrigerant introduced into the hermetic container, An electric motor for driving the compression mechanism, a sealed terminal provided on the sealed container, a lead wire drawn out from the electric motor and connected to the sealed terminal, and an opening for passing a lead wire connected to the sealed terminal. and a gasket sandwiched between the cover and the sealed container, or sandwiched between the cover and a pedestal provided on the sealed container to inhibit gas flow. a fixing part for fixing the cover to the closed container or to the base; and a fixing part for fixing the cover to the pedestal, which is arranged in the opening of the cover to protect the lead wire and has a mesh of 30 mesh or more. a metal bushing, wherein the inner and outer sides of the cover define a gap of 0.9 millimeters or less between the lead wire and the bushing and between the opening in the cover and the bushing ; and the mesh of the bushing .

Further, a refrigeration cycle apparatus according to an embodiment of the present invention includes the hermetic compressor, the radiator, the expansion device, the heat absorber, the hermetic compressor, the radiator, the expansion device, and the heat absorber. a refrigerant pipe that connects the devices and circulates the refrigerant.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram of the refrigerating-cycle apparatus and compressor which concern on embodiment of this invention. 1 is a partially enlarged view of a compressor according to an embodiment of the present invention; FIG. Figure 3 shows a portion of the compressor from arrow A in Figure 2; The figure which shows the other example of the bushing which concerns on embodiment of this invention. The figure which shows the other example of a bushing from the arrow A of FIG. The figure which shows the other example of the protection apparatus which concerns on embodiment of this invention. The figure which shows the other example of a protection apparatus from the arrow A of FIG.

An embodiment of a hermetic compressor and a refrigeration cycle apparatus according to the present invention will be described with reference to FIGS. 1 to 7. FIG. In addition, the same code|symbol is attached|subjected to the structure which is the same or corresponds in several drawings.
FIG. 1 is a schematic diagram of a refrigeration cycle device and a compressor according to an embodiment of the invention.

As shown in FIG. 1, a refrigeration cycle device 1 according to this embodiment is, for example, an air conditioner. The refrigerant used in the refrigeration cycle device 1 contains a hydrocarbon-based (HC-based) refrigerant such as R290 (propane, C3H8).

The refrigeration cycle device 1 includes a hermetic compressor 2 , a radiator 3 , an expansion device 5 , a heat absorber 6 , an accumulator 7 , and refrigerant pipes 8 . A refrigerant pipe 8 connects the compressor 2, the radiator 3, the expansion device 5, the heat absorber 6, and the accumulator 7 in order, and circulates the refrigerant. The radiator 3 is also called a condenser. The heat absorber 6 is also called an evaporator.
The compressor 2 sucks in the refrigerant that has passed through the heat absorber 6 through the refrigerant pipe 8 , compresses it, and discharges high-temperature, high-pressure refrigerant to the radiator 3 through the refrigerant pipe 8 .

The compressor 2 includes a cylindrical sealed container 11 that is placed vertically, a compression mechanism section 12 that is housed in the sealed container 11 and capable of compressing the refrigerant introduced into the sealed container 11, and drives the compression mechanism section 12. and a rotary shaft 15 for transmitting the rotational driving force of the electric motor 13 to the compression mechanism portion 12 .
The airtight container 11 includes a vertically extending cylindrical body 11a, a panel 11b covering the upper end of the body, and a panel 11c covering the lower end of the body.

A discharge pipe 8a for discharging the refrigerant is connected to the end plate 11b on the upper side of the sealed container 11. As shown in FIG. The discharge pipe 8 a is connected to the refrigerant pipe 8 . A sealed terminal 18 for power supply and a protective device 21 covering the sealed terminal 18 are provided on the upper end plate 11 b of the sealed container 11 .

The electric motor 13 is arranged in the upper half of the closed container 11 . The electric motor 13 generates a driving force for rotating the compression mechanism section 12 with electric power supplied through the sealed terminal 18 . The electric motor 13 is arranged above the compression mechanism portion 12 . The electric motor 13 has lead wires 23 connected to the sealed terminals 18 .

The plurality of lead wires 23 are wires for supplying electric power to the electric motor 13 through the sealed terminals 18, and are so-called lead wires. The lead wire 23 is led out from the electric motor 13 and connected to the sealed terminal 18 . A plurality of lead wires 23 are wired according to the type of the electric motor 13 .
The rotary shaft 15 connects the electric motor 13 and the compression mechanism section 12 . The rotating shaft 15 transmits the rotational driving force generated by the electric motor 13 to the compression mechanism portion 12 .

The compression mechanism part 12 is arranged in the lower half part inside the sealed container 11 . The compression mechanism section 12 can compress the refrigerant. When the electric motor 13 rotates the rotating shaft 15 , the compression mechanism section 12 sucks gaseous refrigerant from the refrigerant pipe 8 , compresses it, and discharges it into the sealed container 11 .
The accumulator 7 prevents the liquid refrigerant that has not been gasified in the heat absorber 6 from being sucked into the compressor 2 .
Next, the protective device 21 for the sealed terminal 18 will be described.
FIG. 2 is a partially enlarged view of a compressor according to an embodiment of the invention;
3 is a view of part of the compressor from arrow A in FIG. 2; FIG.
As shown in FIGS. 2 and 3, the compressor 2 according to this embodiment includes a sealing terminal 18 provided on the end plate 11b of the closed container 11 and a protective device 21. As shown in FIGS.
The end plate 11b has a flat surface 11d on which the sealing terminal 18 and the protective device 21 are arranged.

The sealed terminal 18 is provided in a terminal opening 36 passing through the flat surface 11d of the end plate 11b. The sealed terminal 18 has a plurality of connection terminals 37 protruding upward. Each connection terminal 37 is connected to a lead wire W connected to the drive circuit of the electric motor 13 . The lead wire W is laid outside the compressor 2 .

The protective device 21 includes a terminal cover 31 that has a wiring opening 31a through which the lead wire W passes and covers the sealed terminal 18, a fixing portion 32 that fixes the terminal cover 31 to the sealed container 11, the terminal cover 31 and the sealed container 11. and a bushing 35 arranged in the wiring opening 31a of the terminal cover 31 to protect the lead wire W.

The terminal cover 31 accommodates a portion 18a of the sealed terminal 18 exposed to the outside of the sealed container 11 from the flat surface 11d of the sealed container 11 . The terminal cover 31 has a cylindrical shape with a sufficient capacity to accommodate the portion 18a of the sealed terminal 18. As shown in FIG. The bottom surface of the terminal cover 31 is open. By pressing the bottom surface of the terminal cover 31 against the gasket 33, the flow of gas between the terminal cover 31 and the sealed container 11 is prevented.

The terminal cover 31 also has a lead wire extraction portion 38 that protrudes radially outward from the sealed container 11 and that is inclined downward. The lower surface of the lead wire extraction portion 38 is a wiring opening 31a for wiring the lead wire W. As shown in FIG.

A lead wire W connected to the connection terminal 37 of the sealed terminal 18 is passed through the wiring opening 31 a of the terminal cover 31 . The wiring opening 31a faces downward. The wiring opening 31 a is inclined so as to become lower as the distance from the connection terminal 37 increases. The wiring opening 31 a is not defined by the terminal cover 31 alone, but includes an edge defined by the closed container 11 or an edge defined by the gasket 33 .
The fixing portion 32 includes a stud bolt 41 provided on the end plate 11 b of the closed container 11 and a nut 42 tightened on the stud bolt 41 .

The terminal cover 31 has a bolt hole 45 through which the stud bolt 41 passes, and a seating surface 46 for the nut 42 . The terminal cover 31 is pressed against the gasket 33 by tightening the nut 42 onto the stud bolt 41 and pressing the seat surface 46 with the nut 42 . The terminal cover 31 also has a bolt insertion chamber 48 through which the stud bolt 41 is inserted, separately from the terminal chamber 47 that accommodates the connection terminal 37 . A partition wall 49 is provided between the terminal chamber 47 and the bolt insertion chamber 48 . The partition wall 49 prevents gas flow between the terminal chamber 47 and the bolt insertion chamber 48 .

The gasket 33 is made of rubber or highly elastic synthetic resin. The gasket 33 is installed on the flat surface 11 d of the closed container 11 . The gasket 33 has a plate-like shape that is one size wider than the outer shape of the open end 31 b of the terminal cover 31 . The gasket 33 has a first opening 33a in which the sealing terminal 18 is arranged and a second opening 33b in which the stud bolt 41 is arranged. The gasket 33 is sandwiched between the terminal cover 31 and the sealed container 11 and pressed against the sealed container 11 by the fixing portion 32 via the terminal cover 31 . Therefore, the gasket 33 is crushed between the terminal cover 31 and the sealed container 11 and prevents the gas from flowing through the bottom surface of the terminal cover 31 . Note that the bottom surface of the terminal cover 31 includes the lower edge of the partition wall 49 . That is, the lower edge of the partition wall 49 is also pressed against the gasket 33 . The gasket 33 also prevents gas flow between the terminal chamber 47 and the bolt insertion chamber 48 at the lower edge of the partition wall 49 .

The bushing 35 allows the lead wire W to pass through the inside and outside of the terminal cover 31 for wiring, and closes the wiring opening 31 a of the terminal cover 31 . The bushing 35 is made of wire mesh having a mesh size of 30 mesh or more. That is, the bushing 35 is preferably made of metal, preferably stainless steel. The bushing 35 may be a woven mesh woven with metal wires, or may be a plate material punched with a large number of holes, that is, a so-called punching metal.

The term "mesh", which is a unit of wire mesh fineness, indicates the number of meshes per inch (25.4 mm). Thus, 30 mesh or more means 30 or more meshes per inch.

The outer edge of the bushing 35 is fitted in the wiring opening 31 a of the terminal cover 31 , or folded inside the terminal cover 31 via the wiring opening 31 a of the terminal cover 31 . The folded outer edge in this way narrows the gap between the bushing 35 and the wiring opening 31 a more reliably than the mesh of the bushing 35 .

The bushing 35 has a lead wire insertion hole 51 through which the lead wire W is inserted, and a folded portion 52 folded inside the terminal cover 31 along the lead wire W. As shown in FIG. The opening diameter of the lead wire insertion hole 51 is equal to or smaller than the diameter of the lead wire W. As shown in FIG. In other words, the fitting relationship between the lead wire insertion hole 51 and the lead wire W is intermediate fit or interference fit. Such a fitting relationship suppresses the gap between the lead wire insertion hole 51 and the lead wire W to be equal to or less than the mesh of the bushing 35 .

The folded portion 52 is a portion where the lead wire insertion hole 51 is folded toward the inside of the terminal cover 31 . The folded portion 52 narrows the gap between the lead wire insertion hole 51 and the lead wire W more reliably. In addition, the folded portion 52 prevents a gap between the lead wire insertion hole 51 and the lead wire W from opening due to the effect of tension applied to the lead wire W. As shown in FIG.

The bushing 35 has a notch (not shown) for arranging the lead wire W in the lead wire insertion hole 51 . The cut reaches the lead wire insertion hole 51 from the outer edge of the bushing 35 . The notch is closed in the process of restoring the bushing 35 to an appropriate shape that closes the wiring opening 31 a of the terminal cover 31 .
FIG. 4 is a diagram showing another example of the bushing according to the embodiment of the invention.
5 is a diagram showing another example of a bushing from arrow A in FIG. 4. FIG.

The bushing 35 of the compressor 2 according to this embodiment may have a portion sandwiched between the gasket 33 and the sealed container 11 like the bushing 35 of the first example shown in FIGS. However, it may be fitted and held between the gasket 33 and the wiring opening 31a of the terminal cover 31, like the bushing 35A of the second example shown in FIGS.

The bushing 35A of the second example is a plate-shaped wire mesh wound around the lead wire W. As shown in FIG. The bushing 35A protects the lead wire W over a longer distance in the extension direction of the lead wire W, unlike the bushing 35 of the first example, and ensures a gap between the lead wire insertion hole 51 and the lead wire W. Narrow. Moreover, unlike the bushing 35 of the first example, the bushing 35</b>A of the second example does not require a cut for arranging the lead wire W in the lead wire insertion hole 51 .

The bushing 35A is wound around each lead wire W individually. That is, the bushing 35A is wound around each lead wire W in a cylindrical shape. Therefore, the portions between the bushings 35A are closed with a plate-shaped wire net like the bushing 35 of the first example .
An assembly sequence of the protective device 21 having such a configuration will be described.

In the bushing 35 of the first example, the bushing 35 is laid on the flat surface 11d of the closed container 11, and the gasket 33 is laid thereon. In the bushing 35A of the second example, the bushing 35 is laid directly on the flat surface 11d of the closed container 11. As shown in FIG. Each lead wire W is connected to each connection terminal 37 of the sealed terminal 18 .

The bushing 35 is then attached to the lead wire W. As shown in FIG. In the bushing 35 of the first example, the lead wire W is arranged in the lead wire insertion hole 51 . Wire mesh is wound around the lead wire W in the bushing 35A of the second example. In this state, the lead wire W is passed through the wiring opening 31a of the lead wire extraction portion 38 of the terminal cover 31, and the terminal cover 31 is placed over the sealed terminal 18 while the bushings 35 and 35A are arranged in the wiring opening 31a. .
After that, the terminal cover 31 is fixed to the sealed container 11 by tightening the nut 42 onto the stud bolt 41 . The protective device 21 is then assembled.

Through such an assembly process, the space between the terminal cover 31 and the gasket 33 is airtightly closed. The wiring opening 31a of the terminal cover 31 is closed with bushings 35 and 35A. In this way, the inner side and the outer side of the terminal cover 31 are connected through a gap of 0.9 mm or less, specifically, through the mesh of the bushings 35 and 35A.
The stud bolt 41 passes through a bolt insertion chamber 48 independent of the terminal chamber 47 . Therefore, the bolt holes 45 of the terminal cover 31 do not communicate with the terminal chamber 47 .

In addition, in IEC 80079-20-1 (2017) Part20-1: Material characteristics for gas and vapor classification - Test methods and date, electrical equipment group IIA The Maximum Expermental Safe Gap (MESG) for combustible gases (flammable refrigerants), such as propane, is 0.92 millimeters. Therefore, the inner side and the outer side of the terminal cover 31 communicate with each other with a clearance smaller than the maximum safety clearance.

As described above, the compressor 2 and the refrigeration cycle device 1 according to this embodiment connect the inside and the outside of the terminal cover 31 through a gap of 0.9 mm or less. Therefore, in the compressor 2 and the refrigeration cycle device 1, even if propane, which is a refrigerant, leaks from the sealed container 11 and ignites inside the terminal cover 31, the flame inside the terminal cover 31 will spread out of the terminal cover 31. transmission can be prevented. Further, even if propane, which is a refrigerant, leaks from the sealed container 11 and enters the terminal cover 31, the compressor 2 and the refrigeration cycle device 1 can exhaust the propane to the outside of the terminal cover 31 through the gap.

Further, the compressor 2 and the refrigeration cycle device 1 according to the present embodiment are provided with the bushing 35 having the folded portion 52 that folds inside the terminal cover 31 along the lead wire W. As shown in FIG. Therefore, the compressor 2 and the refrigeration cycle device 1 can reliably narrow the gap between the lead wire insertion hole 51 and the lead wire W more than the mesh size of the bushing 35 . In addition, the compressor 2 and the refrigeration cycle device 1 can prevent a gap between the lead wire insertion hole 51 and the lead wire W from opening due to the tension applied to the lead wire W.

Further, the compressor 2 and the refrigeration cycle apparatus 1 according to this embodiment are provided with a terminal cover 31 having a wiring opening 31a facing downward. Therefore, the compressor 2 and the refrigerating cycle device 1 are operated before the refrigerant is ignited even if the propane refrigerant (which has a higher specific gravity than air) leaks from the sealed container 11 into the terminal cover 31 . Therefore, the refrigerant can be easily discharged to the outside of the terminal cover 31 .

Further, the compressor 2 and the refrigeration cycle device 1 according to this embodiment are provided with stainless steel bushings 35 and 35A. Therefore, it is possible to prevent the bushings 35, 35A of the compressor 2, which is housed in the outdoor unit and is installed outdoors, from being broken due to rusting and increasing the size of the mesh.
Next, a second example of the protective device 21 will be described.
FIG. 6 is a diagram showing another example of the protective device according to the embodiment of the invention.
FIG. 7 is a diagram showing another example of the protective device from arrow A in FIG.

As shown in FIGS. 6 and 7, a protective device 21B (hereinafter simply referred to as “protective device 21B”) of the second example of the compressor 2 according to the present embodiment includes a pedestal 61 provided on the sealed container 11 and a a terminal cover 31B having a wiring opening 31a through which the lead wire W passes, covering the sealed terminal 18 and closing the pedestal 61; a fixing portion 32B fixing the terminal cover 31B to the pedestal 61; and a bushing 35B arranged in the wiring opening 31a of the terminal cover 31B to protect the lead wire W.

The pedestal 61 and the terminal cover 31</b>B are combined in a box shape to define a space surrounding the sealed terminal 18 . The pedestal 61 and the terminal cover 31B, which are combined in a box shape, accommodate a portion 18a of the sealed terminal 18 exposed to the outside of the sealed container 11 from the flat surface 11d of the sealed container 11. As shown in FIG.

The pedestal 61 is fixed to the flat surface 11d of the sealed container 11 by a joining method such as adhesion or welding. The pedestal 61 has a vertically flat rectangular shape, and has a rectangular bottom wall 62 fixed to the sealed container 11 and three side walls 63 , 64 , 65 . The pedestal 61 is open upward and to one side. The bottom wall 62 is flat and has a flat first surface 62b fixed to the sealed container 11, a flat second surface 62t facing upward, and an opening 62a in which the sealing terminal 18 is arranged. there is A pair of side walls 63 and 64 facing each other have openings 66 for hooking the ends of the band-shaped fixing portion 32B. The side walls 63 and 64 are inclined so that the heights of the side walls 63 and 64 protrude downward toward the open side surface of the base 61 . A sidewall 65 connects the pair of sidewalls 63 and 64 .

The gasket 33B is made of rubber or highly elastic synthetic resin. The gasket 33B is installed on the second surface 62t of the base 61. As shown in FIG. The gasket 33B has a plate-like shape that is one size wider than the outer shape of the open end 31b of the terminal cover 31B. The gasket 33B has a first opening 33a in which the connection terminal 37 of the sealed terminal 18 is arranged. The gasket 33B is sandwiched between the terminal cover 31B and the pedestal 61, and pressed against the pedestal 61 via the terminal cover 31B by the fixing portion 32B. Therefore, the gasket 33B is crushed between the terminal cover 31B and the pedestal 61 to prevent the gas from flowing through the bottom surface of the terminal cover 31B.

The terminal cover 31B accommodates a part 18a of the sealed terminal 18 exposed from the bottom wall 62 of the pedestal 61. As shown in FIG. The terminal cover 31B has a rectangular shape with a sufficient volume to accommodate the portion 18a of the sealed terminal 18. As shown in FIG. The terminal cover 31B is seated on the gasket 33 on the bottom wall 62 so as to be fitted inside the pedestal 61 . The terminal cover 31B has a pair of side walls 73, 32 facing the side walls 63, 64 of the base 61, a side wall 75 facing the side wall 65 of the base 61, and a side wall 76 whose entire surface is exposed through the open side of the base 61. have. The bottom surface of the terminal cover 31B is open. By pressing the bottom surface of the terminal cover 31B against the gasket 33B, the flow of gas between the terminal cover 31B and the pedestal 61 is blocked.

The side wall 75 is provided with a hook 77 that hooks on the side wall 65 of the pedestal 61 from above to position the terminal cover 31B. The hook 77 prevents the terminal cover 31B from separating from the side wall 65 of the base 61, in other words, from moving the terminal cover 31B toward the open side surface of the base 61. As shown in FIG.

The wiring opening 31 a of the terminal cover 31 B is provided in the side wall 76 . Therefore, the wiring opening 31a of the terminal cover 31B faces the horizontal direction. The wiring opening 31a is vertically elongated near one of the side walls 73 and 74, the side wall 73 in this case. A lead wire W connected to the connection terminal 37 of the sealed terminal 18 is passed through the wiring opening 31a. Note that the wiring opening 31a is not defined only by the terminal cover 31B, but includes an edge defined by the pedestal 61 or an edge defined by the gasket 33B. That is, the lower end of the wiring opening 31a is open at the opening end 31b of the terminal cover 31B.

The fixing portion 32B is elastically deformed so as to press the terminal cover 31B against the pedestal 61 and is hooked on the opening 66 of the pedestal 61 . The fixing portion 32B is hung over the top surface of the terminal cover 31B in an arch shape to the openings 66 of the side walls 63 and 64 of the pedestal 61 .

The bushing 35B allows the lead wire W to pass through the inside and outside of the terminal cover 31 for wiring, and closes the wiring opening 31a of the terminal cover 31B. The bushing 35B is made of wire mesh having a mesh of 30 mesh or more. That is, the bushing 35B is preferably made of metal, preferably stainless steel. The bushing 35B may be a woven mesh made of woven metal wires, or may be a so-called punching metal made by punching a large number of holes in a plate material.

The outer edge of the bushing 35B fits into the wiring opening 31a of the terminal cover 31B, or is folded inside the terminal cover 31B through the wiring opening 31a of the terminal cover 31B. The outer edge folded in this way narrows the gap between the bushing 35B and the wiring opening 31a more reliably than the mesh of the bushing 35B.

The bushing 35B has a lead wire insertion hole 51 through which the lead wire W is inserted. The opening diameter of the lead wire insertion hole 51 is equal to or smaller than the diameter of the lead wire W. As shown in FIG. In other words, the fitting relationship between the lead wire insertion hole 51 and the lead wire W is intermediate fit or interference fit. Such a fitting relationship suppresses the gap between the lead wire insertion hole 51 and the lead wire W to be equal to or less than the mesh of the bushing 35B.

The bushing 35B also has a notch (not shown) for arranging the lead wire W in the lead wire insertion hole 51 . The cut reaches the lead wire insertion hole 51 from the outer edge of the bushing 35B. The notch is closed in the process of restoring the bushing 35B to an appropriate shape that closes the wiring opening 31a of the terminal cover 31B.
It should be noted that the bushing 35B may have a folded portion that is folded back inside the terminal cover 31 along the lead wire W, like the bushing 35 of the first example.
The assembly order of the protective device 21B having such a configuration will be described.

First, the pedestal 61 is fixed to the flat surface 11 d of the closed container 11 . Then, the gasket 33B is laid on the second surface 62t of the base 61. As shown in FIG. Each lead wire W is connected to each connection terminal 37 of the sealed terminal 18 .

The bushing 35B is then attached to the lead wire W. As shown in FIG. A lead wire W is arranged in the lead wire insertion hole 51 . In this state, the lead wire W is passed through the wiring opening 31a of the terminal cover 31B, and the terminal cover 31 is placed over the sealed terminal 18 while the bushing 35B is arranged in the wiring opening 31a.
After that, the terminal cover 31B is fixed to the pedestal 61 by hooking the fixing portion 32B to the opening 66 of the pedestal 61 . The protective device 21B is then assembled.

Through such an assembly process, the space between the terminal cover 31B and the gasket 33B is airtightly closed. The wiring opening 31a of the terminal cover 31B is closed with a bushing 35B. In this way, the inner side and the outer side of the terminal cover 31B are connected through a gap of 0.9 mm or less, specifically, through the mesh of the bushing 35B.

As described above, the compressor 2 and the refrigeration cycle device 1 according to this embodiment connect the inside and the outside of the terminal cover 31B through a gap of 0.9 mm or less. Therefore, in the compressor 2 and the refrigeration cycle device 1, even if propane, which is a refrigerant, leaks from the sealed container 11 and ignites inside the terminal cover 31B, the flame inside the terminal cover 31B will spread out of the terminal cover 31B. transmission can be prevented. Further, the compressor 2 and the refrigeration cycle device 1 can exhaust the propane to the outside of the terminal cover 31 through the gap even if propane, which is a refrigerant, leaks from the sealed container 11 and enters the terminal cover 31B.

Further, the compressor 2 and the refrigeration cycle device 1 according to this embodiment are provided with a bushing 35B made of stainless steel. Therefore, it is possible to prevent the bushing 35B of the compressor 2, which is housed in the outdoor unit and is installed outdoors, from breaking due to rusting and increasing the size of the mesh.

Therefore, according to the refrigeration cycle device 1 and the compressor 2 according to the present embodiment, even if the combustible refrigerant ignites inside the cover, the outside of the cover is not affected. It can have explosion-proof construction to keep the flames contained within.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1... Refrigeration cycle apparatus, 2... Compressor, 3... Radiator, 5... Expansion device, 6... Heat absorber, 7... Accumulator, 8... Refrigerant pipe, 8a... Discharge pipe, 11... Closed container, 11a... Body part , 11b... End plate 11c... End plate 11d... Flat surface 12... Compression mechanism part 13... Electric motor 15... Rotary shaft 18... Sealed terminal 18a... Part 21, 21B... Protective device 23... Lead Lines 31, 31B Terminal cover 31a Opening for wiring 31b Opening end 32, 32B Fixing portion 33, 33B Gasket 33a First opening 33b Second opening 35, 35A, 35B Bushing 36 Terminal port 37 Connection terminal 38 Lead wire outlet 41 Stud bolt 42 Nut 45 Bolt hole 46 Seat surface 47 Terminal chamber 48 Bolt insertion chamber 49... Partition wall 51... Lead wire insertion hole 52... Folding part 61... Pedestal 62... Bottom wall of pedestal 62b... First surface 62t... Second surface 62a... Opening 63, 64, 65... Pedestal side wall of terminal cover 66... opening 73, 74, 75, 76... side wall of terminal cover 77... hook.

Claims (5)

a closed container;
a compression mechanism unit that is housed in the hermetic container and capable of compressing a refrigerant introduced into the hermetic container;
an electric motor for driving the compression mechanism;
a sealed terminal provided in the sealed container;
a lead wire drawn out from the electric motor and connected to the sealed terminal;
a cover that covers the sealed terminal and has an opening for passing a lead wire connected to the sealed terminal;
a gasket sandwiched between the cover and the closed container or sandwiched between the cover and a pedestal provided on the closed container to inhibit gas flow;
a fixing part for fixing the cover to the closed container or fixing the cover to the pedestal;
a metal bushing disposed in the opening of the cover to protect the lead wire and having a mesh of 30 mesh or more;
The inside and outside of the cover are connected by a gap of 0.9 mm or less between the lead wire and the bushing and between the opening in the cover and the bushing, and the mesh of the bushing. hermetic compressor. 2. The hermetic compressor according to claim 1, wherein said bushing has a folded portion folded back inside said cover along said lead wire. 3. The hermetic compressor according to claim 1, wherein said opening of said cover faces downward. 4. The hermetic compressor according to claim 1, wherein said bushing is made of stainless steel. a hermetic compressor according to any one of claims 1 to 4;
a radiator;
an inflator;
a heat absorber;
A refrigeration cycle apparatus comprising: a refrigerant pipe that connects the hermetic compressor, the radiator, the expansion device, and the heat absorber and allows the refrigerant to flow.

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