JP7561391B2 - Compressors and Equipment - Google Patents

Description

This disclosure relates to a compressor that has been made lightweight by fixing a frame made of a material whose main component is light metal to an iron-based container, and to equipment that uses this compressor.

In recent years, in order to reduce the use of fossil fuels from the viewpoint of protecting the global environment, efforts have been made to improve the efficiency and reduce the weight of compressors used in refrigeration cycles.
Patent Document 1 discloses a compressor used in a refrigeration cycle. The compression mechanism components of the compressor, for example, a frame supporting a rotor included in the compressor, are made of iron-based members having a large specific gravity.
Patent Document 2 discloses another compressor, in which the frame supporting the rotor is changed to a material mainly composed of light metal and fixed to an iron-based container mainly composed of iron in order to increase the efficiency and reduce the weight of the compressor.

JP 2009-2290 A JP 2010-84688 A

(Knowledge and other information that forms the basis of this disclosure)
At the time when the inventors came up with the present disclosure, the compressor was configured by welding a frame made of an iron-based material to a container made of an iron-based material, as disclosed in Patent Document 1. With this configuration, since the frame and the container are both made of iron-based metal, welding is easy, but the weight of the compressor is large. If the frame is changed to a material mainly composed of light metal to solve this problem, a large difference in melting point and thermal conductivity will occur. This makes welding difficult and causes a problem of lack of reliability.
Meanwhile, in another compressor disclosed in Patent Document 2, a frame made of an aluminum alloy, which is a light metal, is fixed to the inside of a container made of an iron-based material by shrink fitting or press fitting. The frame is fastened from the outside of the container with a fastening member made entirely of iron or with iron only at the welded parts, and the fastening member and the container are welded together.
However, the configuration described in Patent Document 2 requires many steps, such as inserting and welding the locking member after shrink fitting or press fitting of the frame, which increases the assembly cost. In addition, during shrink fitting or press fitting, a strong stress is applied to the frame, which has a relatively low hardness, causing distortion, which may lead to variations in performance and reduced reliability over long-term use.
In addition, in the case of a configuration in which the frame and the iron-based container are fitted together with a clearance fit, the fixing method described in Patent Document 2 locks the frame, which has been finished from the outside of the container, and therefore, when the locking member is inserted or tightened, distortion occurs in the frame, which has a relatively low hardness, and this can cause variations in performance and reduced reliability.
In order to solve such problems, the inventors have come up with the subject matter of the present disclosure.

The present disclosure provides a low-cost, lightweight compressor with long-term reliability by fixing a frame made of a material primarily composed of light metal to an iron-based container without distortion.

In the compressor of the present disclosure, the frame of the compression mechanism is made of a light metal that is primarily composed of light metal and has a specific gravity of 5 or less. The compressor of the present disclosure is also configured such that the frame is housed in an iron-based container with a member primarily composed of iron fastened to the frame in advance, and the member is welded to the iron-based container to fix the frame made of the light metal with a specific gravity of 5 or less to the iron-based container.

In the compressor disclosed herein, a member mainly made of iron is attached to a frame mainly made of light metal in advance, and the member mainly made of iron is welded to the iron-based container. This allows the frame to be fixed to the iron-based container without causing distortion in the light metal frame, as occurs when the frame mainly made of light metal and the iron-based container are directly welded, and also reduces the number of assembly steps. This makes it possible to provide a low-cost, lightweight compressor with long-term reliability.

1 is a cross-sectional view of a compressor according to a first embodiment of the present invention; FIG. 1 is an enlarged cross-sectional view showing a fixing portion between an iron-based container and a frame, which are essential parts of a compressor according to a first embodiment; FIG. 13 is an enlarged cross-sectional view showing a fixing portion between an iron-based container and a frame, which are essential parts of a compressor according to embodiment 1-2. FIG. 11 is a cross-sectional view showing the relationship between the diameter A of the bolt head of the bolt member at the fixing portion between the iron-based container, which is a main part of the compressor, and the frame, and the diameter B of the through hole, which is the weld hole of the iron-based container, in the embodiment 1-3. FIG. 13 is a diagram showing a bolt head of a bolt member of a compressor according to an embodiment 1-3. FIG. 13 is a diagram showing another bolt head of the bolt member of the compressor in the embodiment 1-3. FIG. 11 is an enlarged cross-sectional view showing a fixing portion between an iron-based container and a frame, which are essential parts of a compressor according to embodiment 1-4. FIG. 13 is an enlarged cross-sectional view showing a fixing portion between an iron-based container and a frame, which are essential parts of a compressor according to embodiment 1-5. FIG. 13 is an enlarged cross-sectional view showing a fixing portion between an iron-based container and a frame, which are essential parts of a compressor according to embodiment 1-6. FIG. 13 is an enlarged cross-sectional view showing a fixing portion between an iron-based container and a frame, which are essential parts of a compressor according to embodiment 1-7. 1 is a cross-sectional view of a compressor according to a second embodiment of the present invention;

Hereinafter, the embodiments will be described in detail with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming more redundant than necessary and to facilitate understanding by those skilled in the art.
It should be noted that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
It should be noted that the present invention is not limited to the following embodiments.

[1-1. Configuration]
FIG. 1 is a vertical cross-sectional view of a scroll compressor according to a first embodiment.
In this scroll compressor 41 a , a compression mechanism 10 for compressing a refrigerant and an electric mechanism 20 for driving the compression mechanism 10 are arranged in a sealed iron-based container 1 .
The iron-based container 1 is composed of a body 1a, a lower lid 1b, and an upper lid 1c. The body 1a is formed in a cylindrical shape extending in the vertical direction. The lower lid 1b closes the lower opening of the body 1a. The upper lid 1c closes the upper opening of the body 1a. The iron-based container 1 has an oil storage section 4 formed at the bottom for storing lubricating oil.
The iron-based container 1 is provided with a refrigerant suction pipe 2 for introducing refrigerant into the compression mechanism 10 and a refrigerant discharge pipe 3 for discharging the refrigerant compressed by the compression mechanism 10 out of the iron-based container 1.

The compression mechanism 10 has a fixed scroll 11, an orbiting scroll 12, and a rotation shaft 13 that drives the orbiting scroll 12 to orbit.
The electric mechanism 20 includes a stator 21 fixed to the iron-based container 1, and a rotor 22 disposed inside the stator 21. The rotating shaft 13 is fixed to the rotor 22. An eccentric shaft 13a that is eccentric with respect to the rotating shaft 13 is formed on the upper end of the rotating shaft 13.

A frame 30 that supports the fixed scroll 11 and the orbiting scroll 12 is provided below the fixed scroll 11 and the orbiting scroll 12 .
The frame 30 is formed with a bearing portion 31 that supports the rotating shaft 13, and a boss receiving portion 32. The frame 30 is fixed to the iron-based container 1 by a fixing method according to an embodiment of the present disclosure.

The fixed scroll 11 includes a disk-shaped fixed scroll end plate 11a, a spiral-shaped fixed spiral wrap 11b standing on the fixed scroll end plate 11a, and an outer peripheral wall portion 11c standing to surround the periphery of the fixed spiral wrap 11b. A discharge port 14 is formed in the approximate center of the fixed scroll end plate 11a.
The orbiting scroll 12 comprises a disk-shaped orbiting scroll end plate 12a, a orbiting spiral wrap 12b erected on the wrap side end surface of the orbiting scroll end plate 12a, and a cylindrical boss portion 12c formed on the anti-wrap side end surface of the orbiting scroll end plate 12a.
The fixed spiral wrap 11b of the fixed scroll 11 and the orbiting spiral wrap 12b of the orbiting scroll 12 are meshed with each other, and a plurality of compression chambers 15 are formed between the fixed spiral wrap 11b and the orbiting spiral wrap 12b.
The boss portion 12c is formed at approximately the center of the orbiting scroll end plate 12a. The eccentric shaft 13a is inserted into the boss portion 12c, and the boss portion 12c is accommodated in the boss accommodating portion 32.
The fixed scroll 11 is fixed to the frame 30 at its outer circumferential wall portion 11c by a plurality of bolts (not shown). On the other hand, the orbiting scroll 12 is supported by the fixed scroll 11 via a rotation restraining member 17 such as an Oldham ring. The rotation restraining member 17, which restrains the rotation of the orbiting scroll 12, is provided between the fixed scroll 11 and the frame 30. As a result, the orbiting scroll 12 orbits relative to the fixed scroll 11 without rotating on its own axis.

The lower end 13b of the rotating shaft 13 is journalled on a subframe 18 disposed at the bottom of the iron-based container 1. A volumetric oil pump 5 is also provided at the lower end of the rotating shaft 13. The oil pump 5 is disposed so that its suction port is located within the oil reservoir 4. The oil pump 5 is driven by the rotating shaft 13, and can reliably suck up the lubricating oil in the oil reservoir 4 disposed at the bottom of the iron-based container 1, regardless of pressure conditions or operating speed. This eliminates the worry of running out of oil.
A rotating shaft oil supply hole 13c is formed in the rotating shaft 13. The rotating shaft oil supply hole 13c extends from the lower end portion 13b of the rotating shaft 13 to the eccentric shaft 13a. The lubricating oil sucked up by the oil pump 5 is supplied through the rotating shaft oil supply hole 13c formed in the rotating shaft 13 to the bearing portion of the subframe 18, the bearing portion 31 of the frame 30, and the boss portion 12c.

The refrigerant sucked through the refrigerant suction pipe 2 is guided from the suction port 15a to the compression chamber 15. The compression chamber 15 moves from the outer periphery toward the center while reducing its volume. When the refrigerant reaches a predetermined pressure in the compression chamber 15, it is discharged from the discharge port 14 provided in the center of the fixed scroll 11 to the discharge chamber 6. A discharge valve is provided in the discharge port 14. When the refrigerant reaches a predetermined pressure in the compression chamber 15, it pushes open the discharge valve and is discharged into the discharge chamber 6. The refrigerant discharged into the discharge chamber 6 is led to the upper part of the iron-based container 1 and discharged from the refrigerant discharge pipe 3.
The orbiting scroll 12 is pressed against the fixed scroll 11 by applying a predetermined intermediate pressure to the orbiting scroll end plate 12a, thereby making it possible to reduce leakage loss from the thrust surface.

In the device according to the present embodiment, a scroll compressor 41a, a condenser 42, a pressure reducing device 43, and an evaporator 44 are connected in a ring shape by piping. The condenser 42 condenses the refrigerant discharged from the refrigerant discharge pipe 3, the pressure reducing device 43 reduces the pressure of the refrigerant condensed in the condenser 42, and the evaporator 44 evaporates the refrigerant reduced in pressure by the pressure reducing device 43.
The refrigerant evaporated in the evaporator 44 is returned from the refrigerant suction pipe 2 to the scroll compressor 41 a.

The base material of the frame 30 and the subframe 18 of the scroll compressor 41a configured as described above is made of a material mainly composed of a light metal (aluminum alloy) having a specific gravity of 5 or less. On the other hand, the base material of the iron-based container 1 is made of a material mainly composed of iron. Therefore, as described above, if the frame 30 and the subframe 18 are directly welded to the iron-based container 1, problems arise in that welding is difficult due to differences in melting points and thermal conductivity, distortion occurs, and reliability is lacking.
2, in the scroll compressor 41a of the present embodiment, a member 97 mainly made of iron is first attached in advance to the outer periphery of the frame 30 and the subframe 18. Then, the member 97 and the iron-based container 1 are welded Z. As a result, the frame 30 and the subframe 18 are indirectly fixed to the iron-based container 1.

[1-2. Operation]
The scroll compressor 41a of the present disclosure configured as described above can easily and without distortion fix the frame 30 and the subframe 18 to the iron-based container 1 in a single process of first fastening the iron-based component 97 to the frame 30 and the subframe 18, and then welding Z the component 97 to the iron-based container 1.
That is, in the scroll compressor 41a of the present disclosure, in order to reduce the weight of the compressor, the base material of the frame 30 and the subframe 18 of the compression mechanism 10 is made of a material mainly composed of a light metal (aluminum alloy) having a specific gravity of 5 or less. Therefore, it is difficult to directly weld the frame 30 and the subframe 18 to the iron-based container 1 made of a material mainly composed of iron, and there is a risk of distortion occurring.
However, a member 97 mainly made of iron is attached to the outer periphery of the frame 30 and the subframe 18 in advance, and the member 97 mainly made of iron is welded to the iron-based container 1 by a single welding process without causing distortion in the frame 30 and the subframe 18. This makes it possible to reduce costs and, for example, suppress misalignment of the axes of the bearings 31 of the frame 30 and the subframe 18 that support the rotating shaft 13. This prevents deterioration in performance and reliability and ensures long-term reliability.

Here, in Fig. 2, the member 97 whose main component is iron can be easily attached to the frame 30 and the subframe 18 by tightly inserting the small diameter shaft portion 97a of the member 97 into the member attachment holes 50 provided in the frame 30 and the subframe 18. This facilitates assembly and promotes cost reduction.
In addition, the member fastening hole 50 has a large diameter hole 50a at the inlet side, which forms a gap T between the large diameter portion 97b of the member 97 and the member fastening hole 50, and this gap T provides a heat insulating effect. This reduces the effect of heat conducted from the weld Z portion through the large diameter portion 97b of the member 97 to the frame 30 and the subframe 18.

The manner in which the iron-based member 97 is attached to the frame 30 and the subframe 18 is not limited to the above-mentioned structure.
3 as an embodiment 1-2, the small diameter shaft portion 97a may be fastened by being screwed into a threaded bolt member 102. This can facilitate assembly and reduce costs.
In this case, since the base material of the frame 30 and the subframe 18 is a light metal, distortion occurs when the bolt members 102, which are mainly made of iron, are fastened. However, this distortion can be removed by performing finish processing in a previously fastened state. This prevents a decrease in performance and provides a highly reliable compressor.

In addition, as shown in FIG. 3, it is preferable that the member 97 is a bolt member 102 having a recess 99. The bolt member 102, the frame 30, and the subframe 18 are made of dissimilar metals and have different linear expansion coefficients, so that a difference in expansion and contraction occurs due to temperature changes. However, this difference can be absorbed within the range of elastic deformation of the threaded engagement parts. This makes it possible to provide a compressor that ensures long-term reliability even under harsh conditions such as repeated temperature changes. In addition, this has the effect of keeping harmful spatter (metal particles) generated during welding Z in the recess 99 of the bolt member 102. If there is no recess 99, such as in a hexagonal bolt, a counterbore equivalent to the recess 99 may be provided in the bolt head.

4 shows the relationship between diameter A of bolt head 102b of bolt member 102 in embodiment 1-2 and diameter B of through hole 96 for welding provided in ferrous container 1 (the same applies to member 97, but the bolt member 102 will be used as an example for explanation). Diameters A and B are set to satisfy A>B, and the bolt head 102b of bolt member 102 is configured to cover and hide through hole 96 for welding in ferrous container 1.
As a result, the heat generated during welding Z is less likely to be transmitted to the frame 30 and subframe 18, which are made of light metal with a low melting point, due to the insulating effect of the gap T described above, thereby making it possible to suppress defects such as cracking and distortion of the frame 30 and the subframe 18. When the shape of the bolt head 102b of the bolt member 102 is not cylindrical as shown in Figure 5A (for example, a hexagonal bolt as shown in Figure 5B), the distance between opposite sides of the bolt head 102b is taken as A.
In addition, the relationship between the fitting length L of the bolt 102a of the bolt member 102 and the diameter D of the bolt 102a of the bolt member 102 satisfies 0.4≦L/D≦8.0. If L/D is less than 0.4, the bolt member 102 may loosen due to a decrease in axial force, and the structural strength may not be sufficient. In addition, compressors used in air conditioners, water heaters, etc. are required to respond to various temperature changes depending on the usage environment. Therefore, if L/D exceeds 8.0, shear fracture may occur between the crests of the bolt 102a due to the difference in elongation between the bolt 102a and the member fastening hole (the member fastening hole in this case is a screw hole) 50 caused by the difference in the expansion and contraction rates of different metals due to temperature changes (the greater the distance from the head seat of the bolt member 102, the greater the difference in elongation).

In addition, the member fastening holes 50 provided in the frame 30 and the subframe 18 are provided with air holes (through holes) 100 that communicate with the space inside the container. According to the above configuration, the air present in the member fastening holes 50 that expands due to the heat during welding Z is guided to the space inside the container. Therefore, in the case of the bolt member 102, it is possible to eliminate the influence on the tightening of the bolt 102a (in this case, the member fastening holes 50 are threaded holes) and the engagement of the threads of the bolt 102a of the bolt member 102. In addition, the bolt member 102 may be provided with a through hole 98 (shown in FIG. 3) that penetrates in the axial direction as described above. This prevents voids from occurring when a molten solidified material is formed in the recess 99 of the bolt member 102, so that the welding strength can be stabilized.

In addition, in this embodiment, the base material of the compression section forming parts fastened to the frame 30, for example the fixed scroll 11, is a material mainly composed of a light metal having a linear expansion coefficient equivalent to that of the frame 30. This configuration is expected to reduce weight, and since they expand and contract in the same way in response to temperature changes, the gaps between the parts are properly maintained and long-term reliability can be ensured. In addition, the base material of the orbiting scroll 12 that is fitted with the fixed scroll 11 is also a material mainly composed of a light metal having a linear expansion coefficient equivalent to that of the fixed scroll 11. This configuration allows for further weight reduction, and at the same time, they expand and contract in the same way in response to temperature changes. Therefore, the gaps between the wraps are properly maintained, resulting in a highly efficient compressor.

In the above-mentioned embodiments 1 to 1-3, examples have been described in which the iron-based member 97 or the bolt member 102 is directly attached to the frame 30 and the subframe 18, which are primarily made of light metal.
However, for example, as shown in Fig. 6 as embodiment 1-4, the member 97 may be an iron-based member that is fixed to the frame 30 and the subframe 18 with fasteners 103 (e.g., bolts). Alternatively, in the case of the bolt member 102, as shown in Fig. 7 as embodiment 1-5, a method of fixing the frame 30 and the subframe 18 by sandwiching them together using a bolt 102a and a nut 105 may be used.

According to each of the above configurations, the member 97 or bolt member 102 is connected to the frame 30 and subframe 18 at two points, the weld Z and the stopper 103, or the weld Z and the nut 105, so that the weld strength is stable and reliability can be improved. In addition, by finishing the frame 30 and subframe 18 with the iron-based member 97 or bolt member 102 fixed, the distortion of the frame 30 and subframe 18 that occurs during fixing can be removed. Furthermore, the difference in the expansion rate or contraction rate due to temperature changes caused by different linear expansion coefficients can be absorbed within the range of elastic deformation of the stopper 103.

In addition, this is also possible in cases where it is not possible to directly thread the frame 30 and subframe 18, which are primarily made of light metal. Therefore, the iron-based member 97 or bolt member 102 that is pre-fixed to the frame 30 and subframe 18 is not limited to a shape that allows direct screwing.

In addition, as shown in Figure 8 as embodiment 1-6, it is desirable to increase the contact area of the bolt bearing surface that comes into direct contact with the frame 30 and the subframe 18 by using a washer 95 or the like to suppress plastic deformation due to thermal stress caused by differences in the linear expansion coefficients of the components.

9 as embodiment 1-7, it is desirable to tape the small diameter shaft portion 97a and tape the member fastening hole 50 into which the small diameter shaft portion 97a is inserted. By tapering the small diameter shaft portion 97a and the member fastening hole 50 into which the small diameter shaft portion 97a is inserted in this way, it is possible to prevent the seat surface of the aluminum member from collapsing due to the difference in thermal expansion coefficient.

[1-3. Effects, etc.]
As described above, the compressor of the present disclosure has, in a sealed iron-based container 1, a compression mechanism unit 10 that compresses a refrigerant, and an electric mechanism unit 20 that drives the compression mechanism unit 10. The compression mechanism unit 10 has a rotating shaft 13 and a frame 30 that supports the rotating shaft 13. The base material of the frame 30 that supports the rotating shaft 13 is a light metal having a specific gravity of 5 or less. A member 97 whose main component is iron is attached to the frame 30 in advance. The member 97 whose main component is iron is welded and fixed to the iron-based container 1 which also has iron as its main component, thereby indirectly fixing the iron-based container 1 and the frame 30.
This allows for a significant weight reduction in the frame 30, and in turn, in the compressor incorporating the frame 30. Furthermore, the frame 30 made of light metal can be fixed to the iron-based container 1 without distortion, and the number of assembly steps can be reduced. Therefore, a compressor that is low cost, lightweight, and has high long-term reliability can be provided.

In this embodiment, a spiral member fastening hole 50 is provided in the frame 30, and the member 97 mainly made of iron is screwed into the spiral member fastening hole 50.
This allows the iron-based member 97 to be fixed directly to the frame 30, simplifying the structure.

In this embodiment, the member 97 made mainly of iron that is screwed into the frame 30 is a bolt member 102 .
This makes it easier to control the tightening torque to the member fastening hole 50 with the helical thread groove of the frame 30, thereby reducing manufacturing costs.

In addition, the bolt member 102 screwed into the frame 30 in this embodiment has a structure having a recess 99 .
This ensures long-term reliability even when used under harsh conditions where there are repeated temperature changes, and also makes it possible to keep harmful spatters (metal particles) generated during welding Z within the recess 99 of the bolt member 102. This makes it possible to improve reliability.

In this embodiment, the relationship between the diameter A of the bolt head 102b of the bolt member 102 and the diameter B of the through hole 96 for welding provided in the iron-based container 1 is set to satisfy A>B. When the bolt head 102b of the bolt member 102 is not cylindrical (e.g., a hexagonal bolt, etc.), the length of the opposite side of the bolt head is defined as A.
This reduces the transfer of welding heat to the frame 30, suppressing defects such as cracks and distortions in the components, and improving reliability.
The bolt member 102 of this embodiment is configured so that the relationship between the bolt fitting length L and the bolt diameter D satisfies 0.4≦L/D≦8.
This satisfies the structural strength of the bolt member 102 and prevents shear fracture, thereby further improving reliability.

In addition, in this embodiment, the member fastening hole 50 provided in the frame 30 is configured to have an air hole 100 communicating with the internal space of the iron-based container 1.
This allows the air in the member fastening hole 50, which expands due to the heat during welding Z, to be guided into the space within the iron-based container 1. Furthermore, the effect of air expansion in the member fastening hole 50 on the fixing of the member 97 or the bolt member 102 to the frame 30 is reduced, and the connection with the frame 30 can be improved.

In addition, the member 97 or the bolt member 102 in this embodiment may be fastened to the member fastening hole 50 of the frame 30 using an engagement means such as a stopper 103 or a nut 105 .
This makes it possible to stabilize the welding strength between the member 97 or the bolt member 102 and the frame 30 and the subframe 18, and to further improve the quality.

In the compressor of this embodiment, the components constituting the compression chamber 15, in addition to the frame 30 and the subframe 18, are made of light metal.
As a result, the components constituting the compression chamber 15 have the same thermal expansion coefficient as the frame 30, and expand and contract in the same manner in response to temperature changes. This allows the gaps between the components to be appropriately maintained, resulting in a highly efficient compressor that is also significantly lighter in weight.

(Embodiment 2)
In the first embodiment, the scroll compressor 41a is described as an example, but the present configuration may also be applied to the rotary compressor 41b.
FIG. 10 is a vertical cross-sectional view of a rotary compressor. A motor element 113 consisting of a stator 111 and a rotor 112, and a compression element 114 driven by the motor element 113 are housed in a sealed iron-based container 110. As shown in FIG. 10, a rotating shaft 118 has an eccentric part 116. A cylinder 117 forms a compression chamber concentric with the center of rotation of the rotating shaft 118. A frame 119 and a subframe 120 hermetically close both sides of the cylinder 117. A piston 121 is attached to the eccentric part 116 and rolls along the inner wall of the compression chamber. The compression chamber is divided into a high pressure chamber and a low pressure chamber by a vane (not shown) that reciprocates in contact with the piston 121. One end of a suction pipe 122 is press-fitted into the cylinder 117 and opens into the low pressure chamber of the compression chamber. The other end of the suction pipe 122 is connected to the low pressure side of a system (not shown) outside the iron-based container 110. A discharge valve (not shown) is provided on the frame 119. A discharge muffler having an opening is fitted to the frame 119. One end of a discharge pipe 123 opens into the space inside the iron-based container 110, and the other end of the discharge pipe 123 is connected to the high-pressure side of the system (not shown).

In the above configuration, the rotation of the rotor 112 is transmitted to the rotating shaft 118, and the piston 121 fitted in the eccentric portion 116 rolls in the compression chamber. The vane abutting the piston 121 divides the compression chamber into a high-pressure chamber and a low-pressure chamber, and the gas sucked in through the intake pipe 122 is continuously compressed. The compressed gas is discharged from the discharge valve (not shown) into the discharge muffler, then released into the space inside the iron-based container 110 and discharged from the discharge pipe 123.

In the device according to the present embodiment, a rotary compressor 41b, a condenser 42, a pressure reducing device 43, and an evaporator 44 are connected in a ring shape by piping. The condenser 42 condenses the refrigerant discharged from the discharge pipe 123. The pressure reducing device 43 reduces the pressure of the refrigerant condensed by the condenser 42. The evaporator 44 evaporates the refrigerant reduced in pressure by the pressure reducing device 43.
The refrigerant evaporated in the evaporator 44 is returned from the suction pipe 122 to the rotary compressor 41b.

In this configuration, the base material of at least one of the frame 119 and the subframe 120 is a material mainly composed of a light metal (aluminum alloy) having a specific gravity of 5 or less. A member 97 mainly composed of iron is attached in advance to the outer periphery of the frame 119 or the subframe 120. The member 97 mainly composed of iron is welded to the iron-based container 1, thereby indirectly fixing the frame 119 or the subframe 18.
This allows the rotary compressor 41b to be significantly lighter in weight. In this configuration, the base material of the cylinder 117 is made of a material mainly composed of a light metal (aluminum alloy) having a specific gravity of 5 or less. The same effect can be obtained when the base material is fixed according to the embodiment of the present disclosure.

In addition, each compressor disclosed herein can use R32, carbon dioxide, or a refrigerant having a double bond between carbon atoms as the refrigerant. The configuration of this embodiment can accommodate larger changes in temperature and pressure, and maintain the reliability of the compressor.

Note that the above-described embodiments are intended to illustrate the technology disclosed herein, and various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents.

The compressor of the present invention is low-cost, lightweight, and maintains high reliability over the long term, and is used in equipment such as air conditioners, dehumidifiers, heat pump water heaters, hot water heating systems, refrigerators (domestic refrigerators, commercial refrigerators), ice makers, showcases, heat pump washing and drying machines, and vending machines.

REFERENCE SIGNS LIST 1 Iron-based container 1a Body 1b Bottom lid 1c Top lid 2 Refrigerant suction pipe 3 Refrigerant discharge pipe 4 Oil storage section 5 Oil pump 6 Discharge chamber 10 Compression mechanism section 11 Fixed scroll (compression section forming part)
11a: fixed scroll end plate; 11b: fixed spiral wrap; 11c: outer peripheral wall portion; 12: orbiting scroll (compression portion forming part);
12a Orbiting scroll end plate 12b Orbiting spiral wrap 12c Boss portion 13 Rotating shaft 13a Eccentric shaft 13b Lower end portion 13c Rotating shaft oil supply hole 14 Discharge port 15 Compression chamber 15a Suction port 17 Rotation restraining member 18 Subframe 20 Electric mechanism portion 21 Stator 22 Rotor 30 Frame 31 Bearing portion 32 Boss accommodating portion 41a Scroll compressor 41b Rotary compressor 42 Condenser 43 Pressure reducing device 44 Evaporator 50 Hole for fastening member 50a Large diameter hole 95 Washer 96 Through hole for welding 97 Member 97a Small diameter shaft portion 97b Large diameter portion 98 Through hole 99 Recess 100 Air hole (through hole)
REFERENCE SIGNS LIST 102 Bolt member 102a Bolt 102b Bolt head 103 Fastener 105 Nut 110 Iron-based container 111 Stator 112 Rotor 113 Electric element 114 Compression element 116 Eccentric portion 117 Cylinder 118 Rotating shaft 119 Frame 120 Subframe 121 Piston 122 Suction pipe 123 Discharge pipe

Claims (9)

A compressor mechanism that compresses a refrigerant and an electric mechanism that drives the compressor mechanism are disposed within a sealed iron-based container, the compressor mechanism having a rotating shaft and a frame that supports the rotating shaft, and a base material of the frame that supports the rotating shaft is a light metal having a specific gravity of 5 or less and containing light metal as a main component,
A member mainly made of iron is fixed to the outer periphery of the frame in advance ,
Since the member mainly made of iron does not protrude from the outer periphery of the frame, the frame is housed in the iron-based container without being shrink-fitted or press-fitted in a state in which the member mainly made of iron is fixed to the frame,
The compressor, characterized in that the member mainly composed of iron is welded and fixed to the iron-based container, thereby fixing the frame to the iron-based container . The compressor according to claim 1, characterized in that the frame is provided with a member fastening hole with a helical screw groove, and the member made of iron as a main component is screwed into the member. The compressor according to claim 2, characterized in that the screwed member made mainly of iron is a bolt member. The compressor according to claim 3, characterized in that the bolt member has a through hole. The compressor according to claim 3 or 4, characterized in that the relationship between the diameter A of the bolt head of the bolt member and the diameter B of the through hole for welding provided in the iron-based container satisfies A>B. The compressor according to any one of claims 3 to 5, characterized in that the relationship between the fitting length L of the bolt member and the diameter D of the threaded portion satisfies 0.4≦L/D≦8. The compressor according to any one of claims 4 to 6, characterized in that the member fastening hole provided in the frame has a through hole communicating with the internal space of the iron-based container. The compressor according to any one of claims 1 to 7, characterized in that the base material of the compression section forming part is a material mainly composed of light metal. An apparatus comprising a compressor, a condenser, a pressure reducing device, and an evaporator according to any one of claims 1 to 8, connected in a ring shape by piping.