WO2014115350A1

WO2014115350A1 - Refrigerator and compressor

Info

Publication number: WO2014115350A1
Application number: PCT/JP2013/066256
Authority: WO
Inventors: 和彦川尻; 佐藤　稔; 英明前山; 高橋　真一; 瀬畑　崇史
Original assignee: 三菱電機株式会社
Priority date: 2013-01-22
Filing date: 2013-06-12
Publication date: 2014-07-31
Also published as: JPWO2014115350A1

Abstract

A refrigerator (100) is provided with a compressor (1), a condenser (2), an expansion valve (3), an evaporator (4), and a refrigerant tube connecting these components, a flame propagation inhibiting device (8) being provided to a discharge refrigerant tube (9) connecting the compressor (1) and the condenser (2).

Description

Refrigerator and compressor

The present invention relates to a refrigerator and a compressor using a combustible material for at least one of a lubricating oil and a refrigerant.

In a refrigerator in which a compressor, a condenser, an expansion mechanism, and an evaporator are connected by refrigerant piping, during operation of the compressor, the refrigerant gas compressed by the compressor incorporating the electric motor is condensed by the condenser, and the expansion mechanism And evaporate with an evaporator. The evaporated refrigerant is sent back to the compressor and circulated in the refrigerator.

For this reason, during the operation of the compressor, the pressure in the refrigerator is a positive pressure higher than the atmospheric pressure from the outlet of the compressor to the inlet of the expansion mechanism, and from the outlet of the expansion mechanism to the inlet of the compressor. The pressure is a negative pressure lower than the atmospheric pressure. Therefore, when a hole is formed in the refrigerant pipe that becomes a refrigerant flow path from the outlet of the expansion mechanism of the refrigerator to the suction port of the compressor due to corrosion, poor welding, or the like, air enters the refrigerator.
In addition, air may be mixed into the refrigerator even when there is a human error in the operation of assembling, installing, and removing the refrigerator.

When flammable oil is used for at least one of the refrigerant and the lubricating oil stored in the compressor, the air mixed in this way is combustible refrigerant (isobutane, propane, R32, etc.) in the refrigerator. Or mixed with lubricating oil vapor or mist to form a combustible mixture. For this reason, there is a possibility that the flammable mixture is ignited or ignited by the sparks coming out of the stator of the compressor motor or the operation of the compressor, and the flame propagates to the entire refrigerator. there were.

Therefore, in a conventional refrigerator, an oxygen adsorbent made of reduced iron or activated carbon is used in a refrigeration cycle comprising a compressor 1, a condenser 2, an expansion mechanism 3, and an evaporator 4 to prevent the generation of a flame. 7, a case 8 for storing the oxygen adsorbent 7, and a transmission plate 9 that transmits oxygen in the refrigeration cycle and partitions the oxygen adsorbent 7 and the refrigeration cycle are proposed (see Patent Document 1). ).

JP 2000-320911 A (summary, FIG. 1)

In the refrigerator described in Patent Document 1, when the air mixed according to the operation of the compressor circulates in the refrigerator together with the refrigerant, the oxygen in the mixed air is circulated through a case housing the oxygen adsorbent. It is configured to remove by adsorption. However, the formation of a combustible air-fuel mixture is inevitable when oxygen exceeding the adsorption rate by the stored oxygen adsorbent or the oxygen exceeding the adsorption capacity is mixed in the refrigerator. For this reason, the conventional refrigerator still ignites or ignites the combustible mixture due to the sparks from the stator of the motor and the high pressure and high temperature of the refrigerant due to the operation of the compressor. There was a problem of propagation.

The present invention has been made to solve the above-described problems, and in a refrigerator and a compressor using a combustible material as at least one of a refrigerant and a lubricating oil, corrosion, poor welding, etc., or The purpose of the present invention is to obtain a refrigerator and a compressor that can prevent a flame from propagating through the entire refrigerator even in the event that air is mixed into the refrigerator due to human error, etc., and it ignites. .

A refrigerator according to the present invention includes a compressor, a condenser, an expansion mechanism, an evaporator, and a refrigerant pipe that connects them, and the compressor includes a compression element, an electric element that drives the compression element, A refrigerating machine in which a combustible material is used for at least one of a refrigerant and a lubricating oil. At least one flame propagation preventing device is provided in the refrigerant flow path from the discharge port to the inlet of the condenser.

Further, a compressor according to the present invention includes a compression element, an electric element that drives the compression element, a sealed container that stores the compression element and the electric element, and stores lubricating oil therein. In a compressor in which a combustible material is used for at least one of refrigerant and lubricating oil, at least one flame propagation preventing device is provided in a refrigerant flow path from a discharge port of the compression element to a discharge port of the sealed container. Is provided.

According to the present invention, air is mixed into the refrigerator, a combustible air-fuel mixture is formed by the air and the combustible refrigerant or lubricating oil, and the refrigerant is generated by the sparks emitted from the stator of the electric motor or the operation of the compressor. Even when the flame is ignited due to high pressure and high temperature, the flame propagation preventing device provided in the refrigerator has an effect of preventing the flame from being propagated to places other than the vicinity of the flame occurrence place.

It is a block diagram of the refrigerator which concerns on Embodiment 1 of this invention. It is sectional drawing which shows an example of the flame propagation prevention apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows another example of the flame propagation prevention apparatus which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the compressor of the refrigerator based on Embodiment 2 of this invention. It is a figure which shows an example of the flame propagation prevention apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows another example of the flame propagation prevention apparatus which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows the compressor of the refrigerator based on Embodiment 3 of this invention. It is a longitudinal cross-sectional view which shows an example of the flame propagation prevention apparatus which concerns on Embodiment 3 of this invention. It is a longitudinal cross-sectional view which shows the compressor of the refrigerator based on Embodiment 5 of this invention. FIG. 10 (a) is a bottom view showing a cup muffler of the compressor according to the fifth embodiment of the present invention, and FIG. 10 (b) is a diagram of the compressor shown in the second to fourth embodiments. It is a bottom view which shows a cup muffler. It is a bottom view which shows an example of the cup muffler in the compressor of the refrigerator which concerns on Embodiment 6 of this invention. It is a figure which shows another example of the cup muffler in the compressor of the refrigerator which concerns on Embodiment 6 of this invention.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a refrigerator according to Embodiment 1 of the present invention.
As shown in FIG. 1, a refrigerator 100 according to the first embodiment includes a compressor 1, a condenser 2, an expansion valve 3 that is an expansion mechanism, an evaporator 4, and a refrigerant pipe that connects these. Yes. The compressor 1 includes a sealed container 11, a compression element 15 and an electric element 13 housed in the sealed container 11. The compression element 15 compresses the refrigerant sucked into the sealed container 11, and various mechanisms (for example, rotary type, scroll type, vane type, etc.) can be adopted. The electric element 13 includes a stator 16, a rotor 17, and a rotating shaft 14 that connects the rotor 17 and the compression element 15. That is, in the compressor 1, the rotor 17 rotates by supplying electric power to the stator 16 from the outside, and the driving force is transmitted to the compression element 15 via the rotating shaft 14, so that the compression element 15 is driven. Thus, the refrigerant is compressed. A lubricating oil reservoir 12 is formed in the lower part of the sealed container 11. The lubricating oil stored in the lubricating oil reservoir 12 is sucked into the compression element 15 together with the refrigerant and supplied to the sliding portion of the compression element 15 and the like.

Further, the refrigerator 100 according to the first embodiment includes a refrigerant pipe (hereinafter referred to as a discharge pipe) that connects the discharge port 11a of the compressor 1 (in other words, the discharge port of the sealed container 11) and the inlet 2a of the condenser 2. A flame propagation preventing device 8 is provided in the refrigerant pipe 9). The detailed configuration of the flame propagation preventing device 8 will be described later.

The refrigerator 100 according to the first embodiment also includes a four-way valve 5, a muffler 6, and an accumulator 7. The four-way valve 5 switches the flow path of the refrigerant discharged from the compressor 1 to a flow path where the refrigerant flows into the condenser 2 or a flow path where the refrigerant flows into the evaporator 4. For example, when the flow path of the refrigerant discharged from the compressor 1 is switched to a flow path through which the refrigerant flows into the evaporator 4, the evaporator 4 functions as the condenser 2 and the condenser 2 functions as the evaporator. It becomes. The muffler 6 is provided on the discharge refrigerant pipe 9 (more specifically, on the downstream side of the flame propagation preventing device 8), and reduces the pulsation of the refrigerant discharged from the compressor 1. The accumulator 7 is provided between the evaporator 4 and the compressor 1, separates the refrigerant flowing out of the evaporator 4 into a liquid refrigerant and a vapor refrigerant, and the liquid refrigerant is sucked into the compressor 1. Is to prevent.

In the refrigerator 100 configured as described above, a flammable refrigerant (for example, isobutane, propane, R32, etc.) is used. In addition, flammable lubricating oil is also used as the lubricating oil. And the refrigerator 100 comprised in this way operate | moves as follows.

The refrigerant compressed by the compressor 1 is discharged from the discharge port 11 a to the discharge refrigerant pipe 9 and flows into the condenser 2 from the inlet 2 a of the condenser 2. This refrigerant is condensed by the condenser 2, decompressed by the expansion valve 3, and evaporated by the evaporator 4. The evaporated refrigerant returns to the compressor 1 through the accumulator 7 and circulates in the refrigerator. With such an operation, the cold generated by the evaporator 4 can be used for air conditioning, for example.

During operation of the compressor 1, the pressure in the refrigerator 100 is such that the pressure from the discharge port 11 a of the compressor 1 to the inlet of the expansion valve 3 becomes a positive pressure higher than the atmospheric pressure, and the compressor 1 passes through the outlet of the expansion valve 3. The pressure to the suction port becomes a negative pressure lower than the atmospheric pressure. Therefore, when a hole is formed in the refrigerant pipe serving as a refrigerant flow path from the outlet of the expansion valve 3 to the suction port of the compressor 1 due to corrosion, poor welding, or the like, air is mixed into the refrigerator 100.
In addition, air may be mixed into the refrigerator 100 even when there is a human error in the operation of assembling, installing, and removing the refrigerator 100.

For this reason, in the refrigerator 100 according to the first embodiment using the combustible refrigerant and the lubricating oil, the air mixed in the refrigerator 100 is composed of the combustible refrigerant, the lubricant oil vapor, and the mist. Mix to form a flammable mixture.

Here, the flammable range of isobutane is 1.8 vol% to 8.4 vol% at atmospheric pressure, the flammable range of propane is 2.1 vol% to 9.5 vol% at atmospheric pressure, and the flammable range of R32 is atmospheric pressure. 13.3 vol% to 29.3 vol%. Such a combustible refrigerant generally has a wide combustible range when the pressure increases. Lubricating oils used in refrigerators ignite at temperatures of over 200 ° C at low temperatures, and therefore, even if there is no flammable refrigerant, it is combustible when lubricating oil vapor or mist is mixed with air. A sex mixture is formed.

Therefore, when a spark is generated in the combustible air-fuel mixture by the stator 16 of the electric element 13 in the compressor 1, the combustible air-fuel mixture in the compressor 1 is ignited. Even if there is no electric spark, when the compressor 1 is operated, the pressure and temperature of the refrigerant in the compressor 1 rises. For example, when the temperature exceeds the ignition temperature of the lubricating oil, the combustibility in the compressor 1 is reached. The mixture is ignited. For this reason, there is a concern that the combustible air-fuel mixture in the compressor 1 burns and the flame propagates from the discharge refrigerant pipe 9 to the entire refrigerator 100.

However, the refrigerator 100 according to the first embodiment is provided with the flame propagation preventing device 8 in the discharge refrigerant pipe 9 as described above. For this reason, even if the combustible air-fuel mixture in the compressor 1 burns and the flame propagates to the discharge refrigerant pipe 9, the flame is extinguished when it reaches the flame propagation prevention device 8. Therefore, the flame does not propagate to the refrigerant pipe on the muffler 6 side of the flame propagation preventing device 8, that is, to the refrigerant flow path on the downstream side of the flame propagation preventing device 8.
For example, the flame propagation preventing device 8 capable of preventing the propagation of the flame has the following configuration.

FIG. 2 is a cross-sectional view showing an example of the flame propagation preventing apparatus according to Embodiment 1 of the present invention.
The flame propagation preventing device 8 shown in FIG. An inlet 42 and an outlet 43 that are cylindrical holes are formed at both ends of the case 40. A discharge refrigerant pipe 9 closer to the compressor 1 than the flame propagation prevention device 8 is connected to the inlet 42, and a discharge on the muffler 6 side (in other words, the condenser 2 side) than the flame propagation prevention device 8 is connected to the outlet 43. A refrigerant pipe 9 is connected. The diameters of the inlet 42 and the outlet 43 are the same D1 as the inner diameter of the discharge refrigerant pipe 9.

A storage portion 40 a that communicates with the inlet 42 and the outlet 43 is formed inside the case 40. The diameter D2 of the storage portion 40a is larger than the diameter D1 of the inlet 42 and the outlet 43. A plurality of disk-shaped wire nets 41 having a diameter D2 are stacked in the storage portion 40a of the case 40. That is, the plurality of laminated metal meshes 41 are configured to partition the refrigerant flow paths before and after the metal mesh 41. In addition, a taper portion is provided in a connecting portion between the inlet 42 and the outlet 43 and the storage portion 40 a so that the wire mesh 41 is not blocked by the inlet 42 and the outlet 43.
Here, the wire mesh 41 corresponds to the partition member of the present invention.

The diameter D2 of the storage portion 40a is made as large as possible than the diameter D1 of the inlet 42 and the outlet 43, thereby reducing the pressure loss of the refrigerant in the flame propagation preventing device 8 during the operation of the refrigerator 100. There exists an effect which can suppress the performance fall of refrigerator 100.
In FIG. 2, the disk-shaped wire mesh 41 is described as an example. However, the cross-sectional shape of the storage portion 40a may be a polygonal shape (for example, a square shape), and the wire mesh 41 having the same shape as the cross-sectional shape of the storage portion 40a may be used. Of course.
In addition, for example, a spacer or the like may be provided between the metal meshes 41, and the metal meshes 41 may be laminated at a predetermined interval.

The operation of the flame propagation preventing device 8 configured as described above will be described below.
The flame that has propagated from the compressor 1 reaches the wire mesh 41 that is stacked in the housing 40 a of the case 40 from the inlet 42 of the flame propagation preventing device 8. The reached flame passes through an opening (for example, 1 mm or less) of the wire mesh 41. At this time, the heat of the flame is transmitted to the plurality of laminated metal meshes 41, and the flame is cooled, so that the combustion reaction cannot be maintained, the flames are extinguished in the middle of the plurality of laminated metal meshes 41, and the flames reach the outlet 43. Do not propagate.

Note that the material of the wire mesh 41 is not particularly limited as long as the material does not burn by flame. For example, the wire mesh 41 may be formed using stainless steel (SUS304, SUS316, etc.) and brass. In FIG. 2, the mesh number of the wire mesh 41 is not particularly limited. However, the wire mesh 41 having various mesh numbers can be used as long as the flame propagation preventing effect is obtained. Incidentally, in the first embodiment, a plurality of metal meshes 41 of several tens of meshes to several hundreds of tens of meshes are stacked. By constructing the flame propagation preventing device 8 by laminating several tens to hundreds of tens of mesh metal mesh 41, the pressure loss of refrigerant when passing through the metal mesh 41 is small, and the capacity and efficiency of the refrigerator 100 are reduced. It can be prevented and the effect of preventing the propagation of flame can be obtained.

Further, the flame propagation preventing device 8 is not limited to the configuration shown in FIG.

FIG. 3 is a diagram showing another example of the flame propagation preventing apparatus according to Embodiment 1 of the present invention. FIG. 3A is a cross-sectional view showing the flame propagation preventing device 8. FIG. 3B is a view of the punching metal 44 provided in the flame propagation preventing device 8 shown in FIG. 3A observed from the direction of arrow A in FIG.

The flame propagation preventing device 8 shown in FIG. An inlet 42 and an outlet 43 that are cylindrical holes are formed at both ends of the case 40. A discharge refrigerant pipe 9 closer to the compressor 1 than the flame propagation prevention device 8 is connected to the inlet 42, and a discharge on the muffler 6 side (in other words, the condenser 2 side) than the flame propagation prevention device 8 is connected to the outlet 43. A refrigerant pipe 9 is connected. A storage portion 40 a that communicates with the inlet 42 and the outlet 43 is formed inside the case 40. The housing 40a of the case 40 is provided with a plurality of disc-shaped punching metals 44 in which a plurality of holes 45 are formed. Between these punching metals 44, a spacer 46 is provided for holding a minute space between adjacent punching metals 44. That is, the plurality of punching metals 44 are stacked in the storage portion 40a of the case 40 with a predetermined interval. Similar to the flame propagation preventing device 8 shown in FIG. 2, the flame propagation preventing device 8 shown in FIG. 3 has a configuration in which a plurality of punching metals 44 partitions the refrigerant flow path before and after the punching metal 44.
Here, the punching metal 44 corresponds to the partition member of the present invention.

Even if the flame propagation preventing device 8 is configured in this way, when the flame that has reached the storage portion 40a passes through the hole 45 of the punching metal 44, the heat of the flame is transmitted to the punching metal 44, and the flame is cooled. For this reason, the combustion reaction cannot be maintained, the flame is extinguished in the middle of the punching metal 44 laminated at a predetermined interval, and the flame does not propagate to the outlet 43. Here, the thickness of the spacer 46 is preferably set to 10 mm or less, so that the flame propagation preventing effect can be further improved.

In addition, the flame propagation prevention apparatus 8 is not limited to the structure shown in FIG.2 and FIG.3. For example, a plate-shaped foam metal may be provided as a partition member in the housing portion 40 a of the case 40. Moreover, you may provide the metal fiber lump formed, for example in plate shape in the accommodating part 40a of case 40 as a partition member. Even when the flame propagation preventing device 8 is configured in this way, the flame heat is generated when the flame that has reached the storage portion 40a passes through the partition member, similarly to the flame propagation preventing device 8 shown in FIGS. It transmits to a partition member and a flame is cooled. For this reason, the combustion reaction cannot be maintained, the flame is extinguished in the middle of the partition member, and the flame does not propagate to the outlet 43.
When a plate-like foam metal is used as the partition member or when a metal fiber lump formed in a plate shape is used, the flame propagation preventing effect can be further improved by laminating a plurality of plate-like members.

As described above, in the refrigerator 100 configured as in the first embodiment, even when a combustible material is used as at least one of the refrigerant and the lubricating oil, the flame propagation preventing device 8 is provided in the discharge refrigerant pipe 9. Therefore, even if the combustible air-fuel mixture in the compressor 1 burns and the flame propagates to the discharge refrigerant pipe 9, the flame is extinguished when it reaches the flame propagation prevention device 8. Therefore, the refrigerator 100 configured as in the first embodiment can prevent the downstream flame from propagating from the flame propagation preventing device 8.

Embodiment 2. FIG.
The installation position and configuration of the flame propagation preventing device are not limited to the flame propagation preventing device 8 shown in the first embodiment. By providing a flame propagation preventing device in the refrigerant flow path downstream of the compression element 15 of the compressor 1, a flame propagation preventing effect can be obtained. For this reason, for example, as shown in the second embodiment, a flame propagation preventing device may be provided. Note that items not particularly described in the second embodiment are the same as those in the first embodiment, and the same functions and configurations may be described using the same reference numerals.

FIG. 4 is a longitudinal sectional view showing a compressor of a refrigerator according to Embodiment 2 of the present invention.
As shown in FIG. 4, the compressor 1 includes a sealed container 11 having a lubricating oil reservoir 12 formed in the lower part. An electric element 13 is accommodated in the upper side of the sealed container 11. A compression element 15 driven by the rotating shaft 14 of the electric element 13 is housed in the lower side of the sealed container 11.

The electric element 13 includes a stator 16 fixed to the inner wall of the sealed container 11 and a rotor 17 inserted into the rotary shaft 14 inside the stator 16. The stator 16 includes an iron core 19 having a plurality of oil return holes 18 and a winding 21. The compression element 15 includes a cylinder 24, a roller 26 that is rotatably attached to the eccentric portion 25 of the rotating shaft 14 and rotates inside the cylinder 24, a vane 27 that contacts the roller 26 and divides the cylinder 24, and the cylinder 24 And an upper bearing portion 28 and a lower bearing portion 29 that rotatably support the rotating shaft 14. Further, the upper bearing portion 28 is formed with a discharge port 15a of the compression element 15. The discharge port 15a is provided with a discharge valve 30 that opens the discharge port 15a when the inside of the cylinder 24 becomes a predetermined pressure or higher. A cup muffler 31 that covers the discharge port 15a is provided above the discharge port 15a. In other words, the refrigerant compressed by the compression element 15 and discharged from the discharge port 15 a is once discharged into the space in the cup muffler 31, and then discharged from the discharge port 34 of the cup muffler 31 into the sealed container 11. 11 discharge ports 11 a are discharged to the outside of the compressor 1.

Furthermore, the compressor 1 according to the second embodiment is provided with a flame propagation preventing device 35 so as to partition the space in the sealed container 11 between the electric element 13 and the compression element 15. This flame propagation preventing device 35 is configured as follows, for example.

FIG. 5 is a diagram showing an example of a flame propagation preventing apparatus according to Embodiment 2 of the present invention.
The flame propagation preventing device 35 shown in FIG. 5 includes a holder 61, a plurality of wire meshes 62, a pressing plate 65, and a pressing plate 66.

The holder 61 includes a disk-shaped bottom plate portion in which an opening for inserting the upper bearing portion 28 is formed at a substantially central portion, and side wall portions erected on the inner peripheral side edge portion and the outer peripheral side edge portion of the bottom plate portion. And have. Further, a plurality of openings 61 a serving as refrigerant flow paths are formed in the bottom plate portion of the holder 61. The plurality of wire meshes 62 are formed in the same shape as the bottom plate portion of the holder 61, for example. These wire meshes 62 are stacked so as to cover the opening 61 a of the holder 61. The holding plate 65 is fixed to the holder 61 by, for example, welding, and sandwiches the inner peripheral side edge of the laminated wire mesh 62 together with the holder 61. The holding plate 66 is fixed to the holder 61 by welding, for example, and sandwiches the outer peripheral side edge of the laminated wire mesh 62 together with the holder 61.

In the flame propagation preventing device 35 configured as described above, the outer peripheral side edge of the holder 61 is press-fitted into the inner wall of the hermetic container 11, and the inner peripheral side edge of the holder 61 is fitted into the upper bearing portion 28. 11 is fixed.

In addition, if the laminated metal mesh 62 covers the opening 61a of the holder 61 serving as a refrigerant flow path, a flame propagation preventing effect can be exhibited. For this reason, the shape of the metal mesh 62, the pressing plate 65, and the pressing plate 66 is arbitrary as long as the laminated metal mesh 62 covers the opening 61a of the holder 61 serving as the refrigerant flow path.

The operation of the refrigerator 100 having the compressor 1 configured as described above will be described below. In addition, since the basic operation as the refrigerator 100 is the same as that of Embodiment 1, the description is abbreviate | omitted. For this reason, below, operation | movement of the compressor 1 provided with the flame propagation prevention apparatus 35 is demonstrated.

The refrigerant that has flowed into the cylinder 24 from the connection pipe that connects the accumulator 7 and the compression element 15 of the compressor 1 is compressed by the cooperation of the roller 26 and the vane 27. When the refrigerant in the cylinder 24 reaches a predetermined pressure or higher, the refrigerant opens the discharge valve 30 and is discharged into the cup muffler 31, and is discharged into the sealed container 11 from the discharge port 34. Is discharged out of the compressor 1 from the discharge refrigerant pipe 9.

As in the first embodiment, when air enters the refrigerator 100, it mixes with the combustible refrigerant in the refrigerator 100, the vapor or mist of lubricating oil, and forms a combustible mixture. Due to the operation of the compressor 1, the pressure and temperature of the refrigerant in the compressor 1 rises. For example, when the temperature reaches or exceeds the ignition temperature of the lubricating oil, the combustible mixture is ignited in the compression element 15 or in the vicinity of the discharge port 15 a. Burn. The flame propagates in the sealed container 11 and reaches the flame propagation preventing device 35 installed in the space between the electric element 13 and the compression element 15. When this flame passes through the openings of the plurality of laminated metal meshes 62, the heat of the flame is transmitted to the metal mesh 62, and the flame is cooled, so that the combustion reaction cannot be maintained. The flame is extinguished on the way.

Note that the flame propagation preventing device 35 is not limited to the configuration shown in FIG. 5 and may have the following configuration, for example.

FIG. 6 is a diagram showing another example of the flame propagation preventing apparatus according to Embodiment 2 of the present invention.
In the flame propagation preventing device 35 shown in FIG. 6, a plurality of wire meshes 62 are fixed to the holder 61 by a plurality of pressing plates 65 and pressing plates 66 by welding or the like.
Also in the flame propagation preventing device 35 configured as described above, the same flame propagation preventing effect as that of the flame propagation preventing device 35 shown in FIG. 5 can be obtained. In addition, the flame propagation preventing effect can be further improved by setting the interval of each of the plurality of wire meshes 62 to preferably 10 mm or less.

The flame propagation preventing device 35 is not limited to the configuration shown in FIGS. As the partition member, instead of the plurality of wire meshes 62, for example, a plurality of punching metals laminated at a predetermined interval may be provided. Further, as the partition member, for example, a plate-shaped foam metal may be provided instead of the plurality of wire meshes 62. Moreover, instead of the plurality of wire meshes 62, for example, a metal fiber lump formed in a plate shape may be provided as the partition member. Even if the flame propagation preventing device 8 is configured in this manner, the same flame propagation preventing effect as that of the flame propagation preventing device 35 shown in FIGS. 5 and 6 can be obtained.

As described above, in the refrigerator 100 configured as in the second embodiment, as in the first embodiment, at least one of the refrigerant and the lubricating oil is used as a combustible one. Even when the combustible air-fuel mixture burns and a flame is generated, the flame can be prevented from propagating throughout the refrigerator 100.
Further, by using the compressor 1 configured as in the second embodiment, even when the combustible mixture in the compressor 1 burns and a flame is generated, the combustion of the combustible mixture is performed in the compressor 1. It is also possible to obtain a flame propagation preventing effect that is limited to only a part of the inside.

Embodiment 3 FIG.
When providing the flame propagation prevention device in the sealed container 11, it may be provided between the discharge port 15a of the compression element 15 and the discharge port 11a of the sealed container 11, for example, a flame propagation prevention device may be provided as follows. . Note that items not particularly described in the third embodiment are the same as those in the first and second embodiments, and the same functions and configurations may be described using the same reference numerals.

FIG. 7 is a longitudinal sectional view showing a compressor of a refrigerator according to Embodiment 3 of the present invention.
The compressor 1 according to the third embodiment is different from the compressor 1 shown in the second embodiment only in that a flame propagation preventing device 36 is provided instead of the flame propagation preventing device 35, and the other configurations are as follows. This is the same as the compressor 1 shown in the second embodiment. The flame propagation preventing device 36 is provided so as to partition a space in the sealed container 11 between the electric element 13 and the discharge port 11 a of the sealed container 11. The flame propagation preventing device 36 is configured as follows, for example.

FIG. 8 is a longitudinal sectional view showing an example of a flame propagation preventing apparatus according to Embodiment 3 of the present invention.
The flame propagation preventing device 36 shown in FIG. 8 includes a holder 63 and a plurality of wire meshes 64.

The holder 63 has a disc-shaped bottom plate portion and a side wall portion erected on the outer peripheral side edge portion of the bottom plate portion. In addition, a plurality of openings 63a serving as refrigerant flow paths are formed in, for example, a substantially central portion of the bottom plate portion of the holder 63. The plurality of wire meshes 64 are formed in the same shape as the bottom plate portion of the holder 63, for example. These wire meshes 64 are stacked and arranged so as to cover the opening 63 a of the holder 63. The laminated wire mesh 64 is fixed to the holder 63 by welding or the like, for example. Note that the wire mesh 64 may be fixed to the holder 63 using a pressing plate or the like.

In the flame propagation preventing device 36 configured in this way, the outer peripheral side edge of the holder 63 is press-fitted into the inner wall of the sealed container 11 and is fixed in the sealed container 11.

In addition, if the laminated metal mesh 64 covers the opening 63a of the holder 63 serving as a refrigerant flow path, a flame propagation preventing effect can be exhibited. For this reason, the shape of the wire mesh 64 is arbitrary as long as the laminated wire mesh 64 covers the opening 63a of the holder 63 serving as a coolant channel.

The operation of the refrigerator 100 having the compressor 1 configured as described above will be described below. Note that the basic operation of the refrigerator 100 is the same as that of the first and second embodiments, and thus the description thereof is omitted. For this reason, below, operation | movement of the compressor 1 provided with the flame propagation prevention apparatus 36 is demonstrated.

As in the first embodiment, when air enters the refrigerator 100, it mixes with the combustible refrigerant in the refrigerator 100, the vapor or mist of lubricating oil, and forms a combustible mixture. For this reason, when a spark occurs in the combustible air-fuel mixture in the stator 16 of the electric element 13 in the compressor 1, the combustible air-fuel mixture is ignited and combusted in the compression element 15 or in the vicinity of the discharge port 15a. Even if there is no electric spark, when the compressor 1 is operated, the pressure and temperature of the refrigerant in the compressor 1 rises. For example, when the temperature exceeds the ignition temperature of the lubricating oil, the inside of the compression element 15 or its discharge In the vicinity of the outlet 15a, the combustible mixture ignites and burns. The flame propagates in the sealed container 11 and reaches the flame propagation preventing device 36 installed above the electric element 13. When this flame passes through the opening of the wire mesh 64, the heat of the flame is transmitted to the wire mesh 64, and the flame is cooled, so that the combustion reaction cannot be maintained. It is extinguished.

The flame propagation preventing device 36 is not limited to the configuration shown in FIG. For example, a plurality of wire meshes 64 may be stacked at a predetermined interval. Further, as the partition member, instead of the plurality of wire meshes 64, for example, a plurality of punching metals stacked at a predetermined interval may be provided. Further, as the partition member, for example, a plate-shaped foam metal may be provided instead of the plurality of wire nets 64. Moreover, instead of the plurality of wire nets 64, for example, a metal fiber lump formed in a plate shape may be provided as the partition member. Even if the flame propagation preventing device 8 is configured in this manner, the same flame propagation preventing effect as that of the flame propagation preventing device 36 shown in FIG. 8 can be obtained.

Further, when the flame propagation preventing device is installed so as to partition the space in the sealed container 11 between the electric element 13 and the discharge port 11a of the sealed container 11, the discharge port 11a of the sealed container 11 (in other words, the discharged refrigerant) A flame propagation preventing device may be installed so as to cover the inlet 9 of the pipe 9.

As described above, in the refrigerator 100 configured as in the third embodiment, as in the first embodiment, at least one of the refrigerant and the lubricating oil is used as a combustible one. Even when the combustible air-fuel mixture burns and a flame is generated, the flame can be prevented from propagating throughout the refrigerator 100.
Further, by using the compressor 1 configured as in the third embodiment, the combustible air-fuel mixture in the compressor 1 is combusted and a flame is generated as in the second embodiment. It is also possible to obtain a flame propagation preventing effect that combustion of the air-fuel mixture is limited to only a part of the compressor 1.

Embodiment 4 FIG.
In the second embodiment, the compressor 1 in which the flame propagation preventing device 35 is installed in the space in the sealed container 11 between the electric element 13 and the compression element 15 has been described. In the third embodiment, the compressor 1 in which the flame propagation preventing device 36 is installed in the space in the sealed container 11 between the electric element 13 and the discharge port 11a of the sealed container 11 has been described. The flame propagation preventing device 35 and the flame propagation preventing device 36 are not necessarily provided separately, and both the flame propagation preventing device 35 and the flame propagation preventing device 36 may be installed in the compressor 1.
Even if both the flame propagation preventing device 35 and the flame propagation preventing device 36 are installed in the compressor 1, as in the second and third embodiments, the combustible mixture burns only in a part of the compressor 1. It is possible to obtain the effect of preventing flame propagation that is limited to the above.

Embodiment 5 FIG.
When providing a flame propagation prevention device in the sealed container 11, for example, a flame propagation prevention device may be provided as follows. Note that items not particularly described in the fifth embodiment are the same as those in the first to fourth embodiments, and the same functions and configurations may be described using the same reference numerals.

FIG. 9 is a longitudinal sectional view showing a compressor of a refrigerator according to the fifth embodiment of the present invention.
The difference between the compressor 1 according to the fifth embodiment and the compressor 1 shown in the second and third embodiments is that a cup muffler 51 is provided instead of the cup muffler 31. In addition, the cup muffler 51 is a flame propagation preventing device instead of the flame propagation preventing device 35 and the flame propagation preventing device 36. The cup muffler 51 (flame propagation preventing device) is configured as follows, for example.

FIG. 10 (a) is a bottom view showing a cup muffler of the compressor according to the fifth embodiment of the present invention, and FIG. 10 (b) is a diagram of the compressor shown in the second to fourth embodiments. It is a bottom view which shows a cup muffler.

As shown in FIG. 10 (b), the cup muffler 31 of the compressor 1 shown in the second to fourth embodiments is formed by processing a metal plate in the same manner as a conventional compressor. It was. That is, the cup muffler 31 of the compressor 1 shown in the second to fourth embodiments includes the discharge port 34, and the refrigerant discharged from the discharge port 15a of the compression element 15 into the inner space of the cup muffler 31 is a cup. It was the structure discharged from the discharge port 34 of the muffler 31 into the sealed container 11.

On the other hand, the cup muffler 51 of the compressor 1 according to the fifth embodiment is formed by molding a plurality of laminated wire meshes. That is, in the cup muffler 51 according to the fifth embodiment, the refrigerant discharged from the discharge port 15a of the compression element 15 permeates from the entire surface of the cup muffler 51 formed of a wire mesh and is discharged into the sealed container 11. It is the composition which becomes.

The compressor 1 including the cup muffler 51 as in the fifth embodiment operates as follows.
As in the first embodiment, when air is mixed into the refrigerator 100, it mixes with the combustible refrigerant in the refrigerator 100, the vapor or mist of lubricating oil, and forms a combustible mixture. For this reason, when the compressor 1 operates, the pressure and temperature of the refrigerant in the compressor 1 rises. For example, when the refrigerant reaches or exceeds the ignition temperature of the lubricating oil, a combustible air-fuel mixture is generated inside the compression element 15 or in the vicinity of the discharge port 15a. Ignites and burns. Then, the flame reaches the inside of the cup muffler 51. When this flame passes through the openings of the plurality of laminated wire meshes constituting the cup muffler 51, the heat of the flame is transferred to the wire mesh and the flame is cooled, so that the combustion reaction cannot be maintained, and the plurality of laminated layers The flame is extinguished in the middle of the wire mesh.

Note that the cup muffler 51 is not limited to the configuration shown in FIG. For example, the cup muffler 51 may be formed of a wire mesh laminated at a predetermined interval. Moreover, you may form the cup muffler 51 with the some punching metal laminated | stacked through the predetermined space | interval. Moreover, you may form the cup muffler 51 with a foam metal. Moreover, you may form the cup muffler 51 with a metal fiber lump. Even if the cup muffler 51 is configured in this manner, the same flame propagation preventing effect as that of the flame propagation preventing device 35 shown in FIG. 10B can be obtained.

As described above, in the refrigerator 100 configured as in the fifth embodiment, as in the first embodiment, at least one of the refrigerant and the lubricating oil is used as a combustible one. Even when the combustible air-fuel mixture burns and a flame is generated, the flame can be prevented from propagating throughout the refrigerator 100.
Further, by using the compressor 1 configured as in the fifth embodiment, the flame can be extinguished only by burning the combustible air-fuel mixture in a very small space in the cup muffler 51.
Further, by providing the cup muffler 51 as in the fifth embodiment, a great silencing effect can be obtained as a cup muffler, and further, oil droplets contained in the refrigerant discharged from the discharge port 15a of the compression element 15 are trapped. (Capturing) separation effect is also obtained.

Embodiment 6 FIG.
When providing a flame propagation prevention device in the sealed container 11, for example, a flame propagation prevention device may be provided as follows. Note that items not particularly described in the sixth embodiment are the same as those in the first to fourth embodiments, and the same functions and configurations may be described using the same reference numerals.

FIG. 11: is a bottom view which shows an example of the cup muffler in the compressor of the refrigerator based on Embodiment 6 of this invention.
In the cup muffler 31 of the compressor 1 according to the sixth embodiment, a plurality of laminated metal meshes 52 are fixed to the cup muffler 31 by welding or the like so as to cover the discharge port 34. These wire meshes 52 serve as a flame propagation prevention device.

The compressor 1 including the cup muffler 31 as in the sixth embodiment operates as follows.
As in the first embodiment, when air is mixed into the refrigerator 100, it mixes with the combustible refrigerant in the refrigerator 100, the vapor or mist of lubricating oil, and forms a combustible mixture. For this reason, when the compressor 1 operates, the pressure and temperature of the refrigerant in the compressor 1 rises. For example, when the refrigerant reaches or exceeds the ignition temperature of the lubricating oil, a combustible air-fuel mixture is generated inside the compression element 15 or in the vicinity of the discharge port 15a. Ignites and burns. Then, the flame reaches the inside of the cup muffler 51. When this flame passes through the openings of the plurality of wire meshes 52 covering the discharge ports 34 of the cup muffler 31, the heat of the flame is transferred to the wire mesh 52, and the flame is cooled, so that the combustion reaction cannot be maintained. The flame is extinguished in the middle of the laminated metal mesh 52.

The flame propagation prevention covering the discharge port 34 of the cup muffler 31 is not limited to the configuration shown in FIG. For example, the discharge port 34 may be covered with a metal mesh laminated at a predetermined interval to constitute flame propagation prevention. Moreover, the discharge port 34 may be covered with a plurality of punching metals stacked at a predetermined interval to constitute flame propagation prevention. Further, the discharge port 34 may be covered with foam metal to prevent flame propagation. Further, the discharge port 34 may be covered with a metal fiber lump to constitute flame propagation prevention. Even if the outlet 34 of the cup muffler 31 is covered with such a flame propagation preventing device, the same flame propagation preventing effect as that of the flame propagation preventing device shown in FIG. 11 can be obtained.

Further, the method of covering the discharge port 34 of the cup muffler 31 by the flame propagation preventing device is not limited to the configuration shown in FIG.

FIG. 12 is a diagram illustrating another example of the cup muffler in the compressor of the refrigerator according to the sixth embodiment of the present invention.
As shown in FIG. 12, a metal mesh 52 in which a plurality of cup mufflers 31 having discharge ports 34 are stacked may be fixed to and covered with the cup muffler 31 by welding or the like with a pressing plate 71 and a pressing plate 72. When the flame reaches the wire mesh 52 covering the cup muffler 31, when passing through the openings of the plurality of wire meshes 52, the heat of the flame is transmitted to the wire mesh 52 and the flame is cooled, so that the combustion reaction cannot be maintained. The flame is extinguished in the middle of the laminated metal mesh 52.

As described above, in the refrigerator 100 configured as in the sixth embodiment, as in the first embodiment, at least one of the refrigerant and the lubricating oil is used as a combustible one. Even when the combustible air-fuel mixture burns and a flame is generated, the flame can be prevented from propagating throughout the refrigerator 100.
Further, by using the compressor 1 having the configuration as in the sixth embodiment, the flame can be extinguished only by burning the combustible air-fuel mixture in a very small space in the cup muffler 51.

In Embodiments 2 to 6 described above, the rotary type compressor has been described as an example. However, in the present invention, the mechanism of the compression element of the compressor is not limited to the rotary type. By providing the flame propagation preventing device shown in the second to sixth embodiments in a compressor having compression mechanisms of various mechanisms (for example, scroll type, vane type, etc.), the second to the second embodiments The effect similar to the form 6 of this can be acquired.

Further, except for the fourth embodiment, each of the above embodiments has a configuration in which only one flame propagation preventing device is provided in one refrigerator 100. Of course, the flame propagation preventing device described in the first to fifth embodiments is appropriately selected, and a plurality of flame propagation preventing devices may be installed in one refrigerator 100. Similarly, it is of course possible to appropriately select the flame propagation preventing device described in the first to fourth embodiments and the sixth embodiment and install a plurality of flame propagation preventing devices in one refrigerator 100.

1 compressor, 2 condenser, 2a inlet, 3 expansion valve, 4 evaporator, 5 4-way valve, 6 muffler, 7 accumulator, 8 flame propagation prevention device, 9 discharge refrigerant piping, 11 sealed container, 11a discharge port, 12 lubrication Oil reservoir, 13 electric element, 14 rotary shaft, 15 compression element, 15a discharge port, 16 stator, 17 rotor, 18 oil return hole, 19 iron core, 21 winding, 24 cylinder, 25 eccentric part, 26 roller, 27 Vane, 28 Upper bearing part, 29 Lower bearing part, 30 Discharge valve, 31 Cup muffler, 34 Discharge port, 35 Flame propagation prevention device, 36 Flame propagation prevention device, 40 Case, 40a storage part, 41 Wire mesh, 42 Entrance, 43 Exit, 44 punching metal, 45 holes, 46 spacers, 51 cup muffler, 52 wire mesh, 6 Holder, 61a opening, 62 wire mesh, 63 holder, 63a opening, 64 wire mesh, 65 pressing plate, 66 pressing plate, 71 pressing plate, 72 pressing plate, 100 refrigerator.

Claims

A compressor, a condenser, an expansion mechanism, an evaporator, and a refrigerant pipe connecting them;
The compressor includes a compression element, an electric element that drives the compression element, a sealed container that stores the compression element and the electric element, and stores lubricating oil therein.
In a refrigerator in which a combustible material is used for at least one of refrigerant and lubricating oil,
A refrigerator having at least one flame propagation preventing device provided in a refrigerant flow path from a discharge port of the compression element to an inlet of the condenser.
The flame propagation preventing device is
The refrigerator according to claim 1, wherein the refrigerator is provided in the refrigerant pipe connecting the compressor and the condenser.
The flame propagation preventing device is
The space between the discharge port side of the sealed container and the space between the discharge port side of the compression element is partitioned into a space in the sealed container between the discharge port of the compression element and the discharge port of the sealed container. The refrigerator according to claim 1 or 2, wherein the refrigerator is provided.
The electric element is disposed above the compression element;
The discharge port of the sealed container is disposed above the electric element,
The flame propagation preventing device is
At least one of the space in the sealed container between the discharge port of the sealed container and the electric element, and the space in the sealed container between the electric element and the compression element The refrigerator according to claim 3, wherein the refrigerator is provided so as to partition the space.
The flame propagation preventing device is
As a partition member for partitioning the refrigerant flow path before and after the refrigerant flow direction, a plurality of laminated metal meshes, a plurality of punching metals, a plate-shaped foam metal, and a metal formed in a plate shape with a predetermined interval Comprising at least one of the fiber masses,
The refrigerating machine according to any one of claims 1 to 4, wherein the partition member partitions the refrigerant flow path before and after the partition member.
The compressor includes a cup muffler that covers a discharge port of the compression element,
The cup muffler is formed of at least one of a plurality of laminated metal meshes, a plurality of punching metals, a foam metal, and a metal fiber lump that are laminated at a predetermined interval.
The refrigerator according to any one of claims 1 to 5, wherein the cup muffler serves as the flame propagation preventing device.
The compressor includes a cup muffler that covers a discharge port of the compression element, and after the refrigerant is once discharged from the discharge port of the compression element to a space in the cup muffler, the refrigerant is discharged from the discharge port of the cup muffler. It is a compressor that is discharged into a sealed container,
The flame propagation preventing device is at least one of a plurality of laminated metal meshes, a plurality of punching metals, a foam metal, and a metal fiber lump that are laminated at a predetermined interval,
The refrigerator according to any one of claims 1 to 5, wherein the flame propagation preventing device is provided so as to cover a discharge port of the cup muffler.
A compression element; an electric element that drives the compression element; and a sealed container that houses the compression element and the electric element and stores lubricating oil therein.
In a compressor in which a combustible material is used for at least one of refrigerant and lubricating oil,
A compressor characterized in that at least one flame propagation preventing device is provided in a refrigerant flow path from a discharge port of the compression element to a discharge port of the sealed container.
The flame propagation preventing device is
The space between the discharge port side of the sealed container and the discharge port side of the compression element is partitioned into the space inside the sealed container between the discharge port of the closed container and the discharge port of the compression element. The compressor according to claim 8, wherein the compressor is provided.
The electric element is disposed above the compression element;
The discharge port of the sealed container is disposed above the electric element,
The flame propagation preventing device is
The space is partitioned into at least one of a space in the sealed container that is above the electric element and a space in the sealed container that is between the electric element and the compression element. The compressor according to claim 9, wherein the compressor is provided.
The flame propagation preventing device is
The partition member includes at least one of a plurality of metal meshes stacked, a plurality of punching metals stacked at a predetermined interval, a plate-like foam metal, and a metal fiber lump formed in a plate shape. ,
The compressor according to any one of claims 8 to 10, wherein the partition member partitions the refrigerant flow path before and after the partition member.
A cup muffler covering the discharge port of the compression element;
The cup muffler is formed of at least one of a plurality of laminated metal meshes, a plurality of punching metals, a foam metal, and a metal fiber lump that are laminated at a predetermined interval.
The compressor according to any one of claims 8 to 11, wherein the cup muffler serves as the flame propagation preventing device.
The compressor includes a cup muffler that covers a discharge port of the compression element, and after the refrigerant is once discharged from the discharge port of the compression element to a space in the cup muffler, the refrigerant is discharged from the discharge port of the cup muffler. It is a compressor that is discharged into a sealed container,
The flame propagation preventing device is at least one of a plurality of laminated metal meshes, a plurality of punching metals, a foam metal, and a metal fiber lump that are laminated at a predetermined interval,
The compressor according to any one of claims 8 to 11, wherein the flame propagation preventing device is provided so as to cover an outlet of the cup muffler.