Compressor and device

Abstract

The present application provides a compressor which is low in cost, light in weight and high in long-term reliability, and in which a frame composed mainly of a light metal is fixed to an iron-based container without deformation. The structure is such that a component (97) composed mainly of iron is fixed to a frame (30) composed of a light metal having a specific gravity of 5 or less, which is a constituent member of a compression mechanism section, the component (97) is welded to an iron-based container (1), and the frame (30) composed of a light metal having a specific gravity of 5 or less is fixed to the iron-based container (1). Thus, the frame (30) composed mainly of a light metal can be fixed to the iron-based container (1) without deformation on the frame (30) composed of a light metal, as in the case where the frame (30) composed mainly of a light metal and the iron-based container (1) are directly welded. In addition, since the assembly man-hours can be reduced, a compressor which is low in cost, light in weight and high in long-term reliability can be provided.

Description

Technical Field

[0001] This invention relates to a compressor that achieves lightweighting by fixing a frame made of a material mainly composed of light metals to an iron-based container, and to equipment using the compressor. Background Technology

[0002] In recent years, based on the perspective of protecting the Earth's environment and in order to reduce the use of fossil fuels, there is a push to make compressors used in refrigeration cycles more efficient and lighter.

[0003] Patent document 1 discloses a compressor for a refrigeration cycle. The compressor's compression mechanism components, such as the frame supporting the rotating body of the compressor, are made of heavy iron-based container components.

[0004] Patent document 2 discloses other compressors. In order to achieve high efficiency and lightweight design, the frame supporting the rotating body is changed to a material mainly composed of light metal and fixed to an iron-based container mainly composed of iron.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2009-2290

[0008] Patent Document 2: Japanese Patent Application Publication No. 2010-84688 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] (The knowledge and insights that form the basis of this disclosure, etc.)

[0011] When the inventors conceived of this invention, as disclosed in Patent Document 1, the compressor employed a structure in which a frame made of ferrous metal and a container made of ferrous metal were welded together. With this structure, the frame and container were made of ferrous metal, making welding easy, but increasing the weight of the compressor. To solve this technical problem, if the frame were changed to a material primarily composed of lightweight metal, a large difference in melting point and thermal conductivity would occur. Therefore, welding would become difficult and lack reliability.

[0012] On the other hand, another type of compressor disclosed in Patent Document 2 involves embedding or pressing a frame made of aluminum alloy, a lightweight metal, into or fixing it to the inside of a container made of iron. A locking member, made entirely of iron or with only iron welded parts, is used to lock the frame from the outside of the container, and this locking member is welded to the container.

[0013] However, if the structure described in Patent Document 2 is adopted, multiple steps are involved, such as inserting and welding the locking component after the frame is fired or pressed in. This increases assembly costs. Furthermore, during firing or pressing, the relatively soft frame is subjected to increased stress, causing deformation, which may lead to performance deviations and reduced reliability over long-term use.

[0014] Furthermore, in cases where the frame and the ferrous container are fitted with a gap, the fixing method described in Patent Document 2 involves locking the precision-machined frame from the outside of the container. Therefore, when inserting or tightening the locking component, deformation can occur on the frame, which has relatively low hardness, potentially leading to performance deviations and reduced reliability.

[0015] The inventors derived the subject of this invention in order to solve this problem.

[0016] The present invention provides a low-cost, lightweight and highly reliable compressor, which fixes a frame made of a material mainly composed of light metals to an iron container without deformation.

[0017] Methods for solving problems

[0018] The compressor of the present invention comprises a frame for the compression mechanism made of a light metal with a specific gravity of 5 or less, primarily composed of light metal. Furthermore, the compressor of the present invention is structured such that a component primarily composed of iron is fixed to the frame, the component is welded to an iron container, and the frame made of the aforementioned light metal with a specific gravity of 5 or less is fixed to the iron container.

[0019] Invention Effects

[0020] The compressor of the present invention pre-fixes iron-based components to a frame primarily composed of light metal, and then welds the iron-based components to an iron-based container. Therefore, as in the case of directly welding the light metal frame to the iron-based container, the frame can be fixed to the iron-based container without deformation on the light metal frame, and assembly time can be reduced. Thus, a low-cost, lightweight compressor with high long-term reliability can be provided. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the compressor in Embodiment 1.

[0022] Figure 2 This is an enlarged cross-sectional view showing the iron container and the fixed part of the frame, which are the main parts of the compressor in Embodiment 1.

[0023] Figure 3 This is an enlarged cross-sectional view showing the iron container and the fixed part of the frame, which are the main parts of the compressor in embodiments 1-2.

[0024] Figure 4 This is a cross-sectional view showing the relationship between the diameter A of the bolt head of the bolt member in the fixing part of the iron container and frame, which are the main parts of the compressor in embodiments 1-3, and the diameter B of the through hole of the welding hole of the iron container.

[0025] Figure 5A This is a diagram showing the bolt head of the bolt assembly of the compressor in embodiments 1-3.

[0026] Figure 5B This is a diagram showing the other bolt heads of the bolt components of the compressor in embodiments 1-3.

[0027] Figure 6 This is an enlarged cross-sectional view showing the iron container and the fixed part of the frame, which are the main parts of the compressor in embodiments 1-4.

[0028] Figure 7 This is an enlarged cross-sectional view showing the iron container and the fixed part of the frame, which are the main parts of the compressor in embodiments 1-5.

[0029] Figure 8 This is an enlarged cross-sectional view showing the iron container and the fixed part of the frame, which are the main parts of the compressor in embodiments 1-6.

[0030] Figure 9 This is an enlarged cross-sectional view showing the iron container and the fixed part of the frame, which are the main parts of the compressor in embodiments 1-7.

[0031] Figure 10 This is a cross-sectional view of the compressor in Embodiment 2. Detailed Implementation

[0032] The embodiments will now be described in detail with reference to the accompanying drawings. However, sometimes unnecessary detailed descriptions will be omitted. For example, there may be omissions of detailed descriptions of matters that are already known, or repetitive descriptions of substantially the same structures. This is to avoid the following description becoming excessively lengthy and to facilitate understanding by those skilled in the art.

[0033] Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the invention, and are not intended to limit the subject matter of the claims.

[0034] (Implementation Method 1)

[0035] Furthermore, the present invention is not limited to the following embodiments.

[0036] [1-1. Structure]

[0037] Figure 1 This is a longitudinal cross-sectional view of the scroll compressor in Embodiment 1.

[0038] The scroll compressor 41a has a compression mechanism 10 for compressing refrigerant and an electric mechanism 20 for driving the compression mechanism 10, which are arranged in a sealed iron container 1.

[0039] The ferrous container 1 consists of a main body 1a, a lower cover 1b, and an upper cover 1c. The main body 1a is formed into a cylindrical shape extending vertically. The lower cover 1b closes the lower opening of the main body 1a. The upper cover 1c closes the upper opening of the main body 1a. The ferrous container has an oil reservoir 4 at the bottom for storing lubricating oil.

[0040] The iron 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 to the outside of the iron container 1.

[0041] The compression mechanism 10 has a fixed scroll member 11, a rotating scroll member 12, and a rotating shaft 13 that drives the rotating scroll member 12 to rotate.

[0042] The electric mechanism 20 includes a stator 21 fixed to the ferrous container 1 and a rotor 22 disposed inside the stator 21. A rotating shaft 13 is fixed to the rotor 22. An eccentric shaft 13a is formed at the upper end of the rotating shaft 13, which is eccentric to the rotating shaft 13.

[0043] A frame 30 supporting the fixed scroll 11 and the rotating scroll 12 is provided below them.

[0044] A bearing portion 31 for supporting the rotating shaft 13 and a boss housing portion 32 are formed on the frame 30. The frame 30 is fixed to the ferrous container 1 by the fixing method of the embodiment of the present invention.

[0045] The fixed scroll member 11 includes: a circular plate-shaped fixed scroll member end plate 11a; scroll-shaped fixed scroll teeth 11b erected on the fixed scroll member end plate 11a; and an outer peripheral wall portion 11c erected to surround the fixed scroll teeth 11b. An outlet 14 is formed at approximately the center of the fixed scroll member end plate 11a.

[0046] The swirling vortex member 12 includes: a circular plate-shaped swirling vortex member end plate 12a; swirling vortex teeth 12b erected on the rolled edge side end face of the swirling vortex member end plate 12a; and a cylindrical boss portion 12c formed on the reverse rolled edge side end face of the swirling vortex member end plate 12a.

[0047] The fixed vortex teeth 11b of the fixed vortex component 11 mesh with the rotating vortex teeth 12b of the rotating vortex component 12, forming a plurality of compression chambers 15 between the fixed vortex teeth 11b and the rotating vortex teeth 12b.

[0048] A boss portion 12c is formed approximately at the center of the end plate 12a of the gyratory scroll member. An eccentric shaft 13a is inserted into the boss portion 12c, and the boss portion 12c is housed in a boss housing portion 32.

[0049] The fixed scroll member 11 is fixed to the frame 30 using multiple bolts (not shown) on its outer peripheral wall 11c. Meanwhile, the rotating scroll member 12 is supported by the fixed scroll member 11 via a rotation-limiting member 17, such as an Oldham ring. The rotation-limiting member 17, which restricts the rotation of the rotating scroll member 12, is provided between the fixed scroll member 11 and the frame 30. Thus, the rotating scroll member 12 rotates relative to the fixed scroll member 11 without rotating.

[0050] The lower end 13b of the rotating shaft 13 is supported by the subframe 18 at the bottom of the ferrous container 1. A positive displacement oil pump 5 is also provided at the lower end of the rotating shaft 13. The oil pump 5 is configured such that its suction inlet is located within the oil reservoir 4. Driven by the rotating shaft 13, the oil pump 5 reliably draws lubricating oil from the oil reservoir 4 located at the bottom of the ferrous container 1, regardless of pressure conditions or operating speed. This eliminates concerns about oil shortage.

[0051] A rotary shaft oil supply hole 13c is formed on the rotary shaft 13. The rotary shaft oil supply hole 13c extends from the lower end 13b of the rotary shaft 13 to the eccentric shaft 13a. Lubricating oil drawn in by the oil pump 5 is supplied to the bearing portion of the sub-frame 18, the bearing portion 31 of the frame 30, and the boss portion 12c through the rotary shaft oil supply hole 13c formed in the rotary shaft 13.

[0052] Refrigerant drawn in through refrigerant suction pipe 2 is introduced into compression chamber 15 through suction port 15a. Compression chamber 15 moves from the outer periphery towards the center while compressing its volume. Refrigerant that reaches a specified pressure in compression chamber 15 is discharged from discharge port 14 located in the center of fixed scroll member 11 to discharge chamber 6. Discharge valve is provided at discharge port 14. Refrigerant that reaches a specified pressure in compression chamber 15 pushes open discharge valve and is discharged into discharge chamber 6. Refrigerant discharged into discharge chamber 6 is directed to the upper part of ferrous container 1 and discharged through refrigerant discharge pipe 3.

[0053] The swirling scroll 12 is pressed against the fixed scroll 11 by applying a predetermined intermediate pressure to the end plate 12a of the swirling scroll. This reduces leakage losses from the thrust surface.

[0054] In the device of this embodiment, the scroll compressor 41a, condenser 42, pressure reducing device 43, and evaporator 44 are connected in a ring shape by piping. The refrigerant discharged from the refrigerant discharge pipe 3 is condensed in the condenser 42, the pressure reducing device 43 reduces the pressure of the refrigerant condensed in the condenser 42, and the pressure reducing device 43 evaporates the refrigerant that has been depressurized in the pressure reducing device 43.

[0055] The refrigerant evaporated in the evaporator 44 returns to the scroll compressor 41a from the refrigerant suction pipe 2.

[0056] The frame 30 and sub-frame 18 of the scroll compressor 41a constructed in the above manner are made primarily of a light metal (aluminum alloy) with a specific gravity of 5 or less. On the other hand, the base material of the ferrous container 1 is made primarily of iron. Therefore, as described above, if the frame 30 and sub-frame 18 are directly welded to the ferrous container 1, the difference in melting point or thermal conductivity leads to technical problems such as difficulty in welding and fixing, deformation, and lack of reliability.

[0057] Therefore, in the scroll compressor 41a of this embodiment, as Figure 2 As shown, firstly, a component 97, primarily composed of iron, is pre-fixed to the outer periphery of the frame 30 and the sub-frame 18. Then, the component 97 is welded to the iron container 1. Thus, the frame 30 and the sub-frame 18 are indirectly fixed to the iron container 1.

[0058] [1-2. Actions]

[0059] In the scroll compressor 41a of the present invention constructed in the above manner, the component 97, which is mainly composed of iron, is fixed to the frame 30 and the sub-frame 18 in advance. By welding the component 97 to the iron container 1 in a single process, the frame 30 and the sub-frame 18 can be easily fixed to the iron container 1 without deformation.

[0060] That is, in order to achieve a lightweight compressor, the base material of the frame 30 and the sub-frame 18 of the compression mechanism section 10 of the scroll compressor 41a of the present invention is a material with a specific gravity of less than 5 (aluminum alloy) as the main component. Therefore, it becomes difficult to directly weld the frame 30 and the sub-frame 18 onto the iron-based container 1, which is made of a material with iron as the main component, and deformation may occur.

[0061] However, a component 97, primarily composed of iron, is pre-fixed to the outer periphery of the aforementioned frame 30 and sub-frame 18, and this component 97 is then welded to the iron-based container 1. Thus, without deforming the frame 30 and sub-frame 18, the frame 30 and sub-frame 18 can be fixed to the iron-based container 1 through a single welding process. This reduces costs and, for example, suppresses the misalignment of the axial center of the bearing portion 31 of the frame 30 and sub-frame 18 supporting the rotating shaft 13. Therefore, performance and reliability degradation can be prevented, ensuring long-term reliability.

[0062] Here, for the fixing of component 97, which is mainly composed of iron, to frame 30 and sub-frame 18, in Figure 2 In this process, the small-diameter shaft portion 97a of component 97 can be easily inserted into the component fixing hole 50 provided on the frame 30 and the sub-frame 18. As a result, cost reduction is promoted by simplifying assembly.

[0063] Furthermore, the aforementioned component fixing hole 50 has a large-diameter hole 50a on the inlet side, forming a gap T between it and the large-diameter portion 97b of the component 97. This gap T provides a heat insulation effect. As a result, the heat conducted from the welded Z portion through the large-diameter portion 97b of the component 97 to the frame 30 and the sub-frame 18 can be reduced.

[0064] Furthermore, the fixing of the aforementioned iron-based component 97 to the frame 30 and sub-frame 18 is not limited to the aforementioned structure.

[0065] For example, as in implementation methods 1-2, such as Figure 3 As shown, a structure can also be adopted in which the small-diameter shaft portion 97a is screwed onto the bolt component 102, which is made into a screw, for fixation. This simplifies assembly and reduces costs.

[0066] In this case, since the base materials of the frame 30 and the sub-frame 18 are light metals, deformation occurs when bolting the bolted components 102, which are primarily composed of iron. However, by performing a finishing process in the pre-bolted state, this deformation is removed. This prevents performance degradation and provides a highly reliable compressor.

[0067] In addition, such as Figure 3As shown, the aforementioned component 97 preferably employs a bolt component 102 with a recess 99. This bolt component 102, the frame 30, and the sub-frame 18 are dissimilar metals, and due to their different coefficients of linear expansion, they experience differences in expansion and contraction due to temperature changes. However, this difference can be absorbed within the range of elastic deformation of the protrusions at the threaded engagement portion. Therefore, a compressor that ensures long-term reliability can be provided even under harsh conditions such as repeated temperature changes. Furthermore, it has the effect of trapping harmful spatter (metal particles) generated during welding Z within the recess 99 of the bolt component 102. In the case of a hexagonal bolt without a recess 99, a countersunk hole equivalent to the recess 99 can be provided at the bolt head.

[0068] Figure 4 The relationship between the diameter A of the bolt head 102b of the bolt component 102 in embodiments 1-2 and the diameter B of the through hole 96 for welding provided on the ferrous container 1 is shown (the same applies to component 97; the case of bolt component 102 will be used as an example for explanation). The diameters A and B satisfy A > B, and the through hole 96 for welding of the ferrous container 1 can be covered by the bolt head 102b of the bolt component 102.

[0069] Therefore, based on the heat insulation effect of the aforementioned gap T, the heat during welding Z is difficult to transfer to the frame 30 and sub-frame 18, which are light metals with low melting points, thus suppressing defects such as cracks and deformation in the frame 30 and sub-frame 18. The shape of the bolt head 102b of the bolt component 102 is not... Figure 5A The cylindrical shape shown (e.g.) Figure 5B In the case of hexagonal bolts (e.g., those shown), the distance between opposite sides of the bolt head 102b is set as A.

[0070] Furthermore, the relationship between the engagement length of the bolt 102a of the bolt component 102 and the diameter D of the bolt 102a of the bolt component 102 satisfies 0.4 ≤ L / D ≤ ​​8.0. If L / D is less than 0.4, the axial force may be reduced due to loosening of the bolt component 102, potentially failing to meet structural strength requirements. Additionally, compressors used in air conditioning units or water heaters require adaptability to various temperature changes depending on the operating environment. Therefore, if L / D exceeds 8.0, the difference in elongation between the bolt 102a and the component fixing hole (which is a threaded hole in this case) 50 due to the difference in expansion and contraction rates of dissimilar metals caused by temperature changes (the greater the distance from the head seat surface of the bolt component 102, the greater the difference in elongation) may cause shear failure of the protrusions of the bolt 102a.

[0071] Furthermore, an air hole (through hole) 100 communicating with the internal space of the container is provided in the component fixing hole 50 provided on the frame 30 and the sub-frame 18. According to the above structure, air existing in the component fixing hole 50 that expands due to heat during welding Z is discharged into the internal space of the container. Therefore, in the case of the bolt component 102, the effects of tightening the bolt 102a (in this case, the component fixing hole 50 is a threaded hole) and the engagement of the protrusions of the bolt 102a on the bolt component 102 can be eliminated. Additionally, as described above, a through hole 98 extending axially can also be provided on the bolt component 102. Figure 3 (As shown). Therefore, no voids are generated when the molten solidified material is formed in the recess 99 of the bolt component 102, thus ensuring stable weld strength.

[0072] Furthermore, in this embodiment, the base material of the compression forming component, such as the fixed scroll member 11, fastened to the frame 30 is a material mainly composed of light metals, having the same coefficient of linear expansion as the frame 30. With this structure, not only can lightweighting be expected, but also, because it expands and contracts similarly with respect to temperature changes, the gaps between components can be appropriately maintained, ensuring long-term reliability.

[0073] Furthermore, the base material of the rotary scroll 12, which is fitted with the fixed scroll 11, is also a lightweight metal-based material with the same coefficient of linear expansion as the fixed scroll 11. This structure allows for further weight reduction while maintaining the same expansion and contraction rate with respect to temperature changes. Therefore, the gap between the scroll teeth can be appropriately maintained, resulting in a highly efficient compressor.

[0074] The above embodiments 1 to 1-3 describe examples of directly fixing components 97 or bolt components 102, which are mainly composed of iron, to the frame 30 and sub-frame 18, which are mainly composed of light metal.

[0075] However, the aforementioned component 97 can also be, for example, as follows: Figure 6 As shown in embodiments 1-4, the component 97, which is mainly composed of iron, is fixed to the frame 30 and the sub-frame 18 using fasteners 103 (e.g., bolts). Alternatively, in the case of bolt component 102, as... Figure 7 As shown in embodiments 1-5, a method of fixing the frame 30 and the sub-frame 18 by using bolts 102a and nuts 105 to clamp them can also be adopted.

[0076] Based on the above structures, since the components 97 or bolt components 102 are joined to the frame 30 and sub-frame 18 at two points where welding Z is applied to fastener 103 or at two points where welding Z is applied to nut 105, the welding strength is stable, further improving reliability. Furthermore, by precision machining the frame 30 and sub-frame 18 while fixing the iron-based components 97 or bolt components 102, deformation of the frame 30 and sub-frame 18 during fixing can be eliminated. Additionally, the differences in expansion or contraction rates caused by temperature variations due to different coefficients of linear expansion can be absorbed within the elastic deformation range of the fastener 103.

[0077] Furthermore, it can handle situations where direct threading cannot be performed on the frame 30 and sub-frame 18, which are primarily composed of light metals. Therefore, the components 97 or bolt components 102, which are primarily composed of iron and are pre-fixed to the frame 30 and sub-frame 18, are not limited to the shape of direct screw connection.

[0078] In addition, such as Figure 8 As shown in embodiments 1-6, in order to suppress plastic deformation caused by thermal stress due to the difference in linear expansion rates of components, the bolt seat surfaces that are in direct contact with the frame 30 and the sub-frame 18 are preferably equipped with washers 95 or the like to increase the contact area.

[0079] In addition, such as Figure 9 As shown in embodiments 1-7, it is preferable to form the small-diameter shaft portion 97a into a tapered shape, and to form the component fixing hole 50 into which the component is inserted into the small-diameter shaft portion 97a into a tapered shape. In this way, by forming the small-diameter shaft portion 97a and the component fixing hole 50 into which the component is inserted into the small-diameter shaft portion 97a into tapered shapes, it is possible to avoid the recess of the seat surface of the aluminum component caused by the difference in thermal expansion coefficients.

[0080] [1-3. Effects, etc.]

[0081] As described above, the compressor of the present invention has a compression mechanism 10 for compressing refrigerant and an electric mechanism 20 for driving the compression mechanism 10 within a sealed ferrous container 1. The compression mechanism 10 has a rotating shaft 13 and a frame 30 supporting the rotating shaft 13. The base material of the frame 30 supporting the rotating shaft 13 is a light metal with a specific gravity of 5 or less. A component 97, primarily composed of iron, is pre-fixed to the frame 30. The component 97, primarily composed of iron, is welded and fixed to the ferrous container 1, which is also primarily composed of iron, thereby indirectly fixing the ferrous container 1 and the frame 30.

[0082] This allows for significant weight reduction in compressors with a frame 30, or even those with an integrated frame 30. Furthermore, the lightweight metal frame 30 can be securely fixed to the ferrous container 1 without deformation, and assembly time can be reduced. Therefore, a low-cost, lightweight compressor with high long-term reliability can be provided.

[0083] In addition, this embodiment adopts a structure in which a spiral-shaped component fixing hole 50 is provided on the frame 30, and then the component 97, which is mainly composed of iron, is screwed on.

[0084] Therefore, the component 97, which is mainly composed of iron, can be directly fixed to the frame 30, thus simplifying the structure.

[0085] In addition, the component 97, which is mainly composed of iron and is screwed to the frame 30 of this embodiment, is used as a bolt component 102.

[0086] Therefore, managing the tightening torque in the mounting holes 50 of the frame 30 for fixing components with helical thread grooves becomes easier, reducing manufacturing costs. Additionally, the bolts 102a include bolts that are not used in pairs with the nuts 105.

[0087] In addition, the bolt member 102, which is screwed to the frame 30 of this embodiment, has a structure with a recess 99.

[0088] Therefore, even under harsh conditions such as repeated temperature changes, long-term reliability can be ensured, and harmful spatter (metal particles) generated during welding Z can remain in the recess 99 of the bolt component 102. This further improves reliability.

[0089] Furthermore, in this embodiment, the diameter A of the bolt head 102b of the bolt component 102 and the diameter B of the through hole 96 for welding provided on the iron-based container 1 satisfy the relationship that A > B. Additionally, when the bolt head 102b of the bolt component 102 is not cylindrical (e.g., a hexagonal bolt), the length of opposite sides of the bolt head is set to A.

[0090] This reduces the heat transfer of welding heat to the frame 30, suppresses defects such as cracks and deformation of components, and improves reliability.

[0091] Furthermore, in this embodiment, the relationship between the bolt engagement length L and the bolt diameter D of the bolt component 102 satisfies 0.4≤L / D≤8.

[0092] Therefore, the structural strength of the bolt component 102 can be met and shear failure can be prevented, and the reliability can be further improved.

[0093] In addition, an air hole 100 communicating with the internal space of the iron container 1 is provided on the component fixing hole 50 provided on the frame 30 of this embodiment.

[0094] This allows air from the component fixing hole 50, which expands due to the heat during welding, to be discharged into the space inside the ferrous container 1. Furthermore, it reduces the impact of air expansion within the component fixing hole 50 on the fixation of component 97 or bolt component 102 on the frame 30, improving the connection with the frame 30.

[0095] Alternatively, fasteners 103 or nuts 105 or other engaging mechanisms can be used to fix the component 97 or the bolt component 102 of this embodiment into the component fixing hole 50 of the frame 30.

[0096] This ensures stable welding strength between component 97 or bolt component 102 and frame 30 and sub-frame 18, further improving quality.

[0097] In addition, in the compressor of this embodiment, apart from the frame 30 and the sub-frame 18, the components constituting the compression chamber 15 are made of light metal.

[0098] As a result, the components constituting the compression chamber 15 have the same rate of thermal expansion as the frame 30, expanding and contracting in the same way according to temperature changes. Therefore, the gaps between components can be appropriately maintained, achieving high efficiency while providing a significantly lighter compressor.

[0099] (Implementation Method 2)

[0100] In Embodiment 1, an example of a scroll compressor 41a was described. However, this structure can also be applied to a rotary compressor 41b.

[0101] Figure 10 This is a longitudinal cross-sectional view of a rotary compressor. An electrically driven component 113, consisting of a stator 111 and a rotor 112, is housed within a sealed ferrous container 110; and a compression component 114 driven by this electrically driven component 113. Figure 10As shown, the rotating shaft 118 has an eccentric portion 116. A cylinder 117 forms a compression chamber concentrically with the rotation center of the rotating shaft 118. A frame 119 and a sub-frame 120 hermetically seal both sides of the cylinder 117. A piston 121 is mounted on the eccentric portion 116 and rotates along the inner wall of the compression chamber. A blade (not shown) reciprocates in contact with the piston 121, dividing the compression chamber into a high-pressure chamber and a low-pressure chamber. One end of the suction pipe 122 is pressed into the cylinder 117, opening into the low-pressure chamber of the compression chamber. The other end of the suction pipe 122 connects to the low-pressure side of the system (not shown) outside the ferrous container 110. A discharge valve (not shown) is provided on the frame 119. A discharge muffler with an opening is embedded in the frame 119. One end of the discharge pipe 123 opens into the space inside the ferrous container 110, and the other end of the discharge pipe 123 connects to the high-pressure side of the system (not shown).

[0102] In the above structure, the rotation of rotor 112 is transmitted to rotating shaft 118, and piston 121, mounted on eccentric portion 116, rotates in compression chamber. Furthermore, blades abutting against piston 121 divide the compression chamber into high-pressure and low-pressure chambers, continuously compressing the gas drawn in from suction pipe 122. The compressed gas is discharged from discharge valve (not shown) into discharge silencer and then opens into the space inside ferrous container 110, exiting through discharge pipe 123.

[0103] In this embodiment, the rotary compressor 41b, condenser 42, pressure reducing device 43, and evaporator 44 are connected in a ring shape by piping. The refrigerant discharged from the discharge pipe 123 is condensed in the condenser 42. The pressure reducing device 43 reduces the pressure on the refrigerant condensed in the condenser 42. The refrigerant reduced by the pressure reducing device 43 is evaporated in the evaporator 44.

[0104] The refrigerant evaporated in evaporator 44 returns from suction pipe 122 to rotary compressor 41b.

[0105] In this structure, at least one material of the frame 119 or sub-frame 120 is primarily composed of a light metal (aluminum alloy) with a specific gravity of 5 or less. A component 97, primarily composed of iron, is pre-fixed to the outer periphery of the frame 119 or sub-frame 120. The frame 119 or sub-frame 18 is indirectly fixed by welding the iron-based component 97 to the iron container 1.

[0106] This allows for a significant reduction in the weight of the rotary compressor 41b. In this structure, the base material of the cylinder 117 is primarily composed of a lightweight metal (aluminum alloy) with a specific gravity of 5 or less. According to an embodiment of the invention, the same effect can be achieved even when the base material is fixed.

[0107] Furthermore, in each compressor of the present invention, a refrigerant having R32, carbon dioxide, or a double bond between carbon atoms can be used as the refrigerant. With the structure of this embodiment, it is possible to cope with greater temperature and pressure variations and maintain the reliability of the compressor.

[0108] Furthermore, the above embodiments are for illustrative purposes only, and various changes, substitutions, additions, omissions, etc., can be made within the scope of the claims or their equivalents.

[0109] Industrial availability

[0110] The compressor of this invention can maintain low cost, lightweight and high long-term reliability, and can be used in equipment such as air conditioners, dehumidifiers, heat pump water heaters, hot water heating devices, cold storage (household cold storage, commercial cold storage), ice makers, display cabinets, heat pump washer-dryers, and vending machines.

[0111] Explanation of reference numerals in the attached figures

[0112] 1. Iron-based containers

[0113] 1a Main Cadre

[0114] 1b Lower cover

[0115] 1c top cover

[0116] 2 Refrigerant Suction Pipe

[0117] 3 Refrigerant discharge pipe

[0118] 4. Oil storage section

[0119] 5. Oil pump

[0120] 6. Exhaust chamber

[0121] 10. Compression Mechanism Department

[0122] 11. Fixed scroll component (compression section forming component)

[0123] 11a Fixed scroll end plate

[0124] 11b Fixed vortex gear

[0125] 11c Peripheral wall portion

[0126] 12-rotation scroll components (compression section forming parts)

[0127] 12a Rotary scroll end plate

[0128] 12b Cycloidal Vortex

[0129] 12c Boss section

[0130] 13 Rotation axis

[0131] 13a Eccentric Shaft

[0132] 13b Lower end

[0133] 13c Rotary shaft oil supply hole

[0134] 14 Discharge outlets

[0135] 15 Compression Chamber

[0136] 15a Inlet

[0137] 17 Rotation limiting components

[0138] 18 Sub-racks

[0139] 20 Electric Mechanism Department

[0140] 21 Stator

[0141] 22 Rotors

[0142] 30 racks

[0143] 31 Bearing section

[0144] 32. Surface storage unit

[0145] 41a Scroll compressor

[0146] 41b Rotary compressor

[0147] 42 Condenser

[0148] 43 Pressure reducing device

[0149] 44 Evaporator

[0150] 50 Component mounting holes

[0151] 50a large diameter hole

[0152] 95 Washer

[0153] 96 Through holes for welding

[0154] 97 parts

[0155] 97a Small Diameter Shaft

[0156] 97b Large diameter part

[0157] 98 through hole

[0158] 99 recess

[0159] 100 air hole (through hole)

[0160] 102 Bolt components

[0161] 102a bolt

[0162] 102b Bolt Head

[0163] 103 Fasteners

[0164] 105 Nut

[0165] 110 Iron-based containers

[0166] 111 Stator

[0167] 112 Rotor

[0168] 113 Electrical components

[0169] 114 Compression components

[0170] 116 Eccentric part

[0171] 117 cylinders

[0172] 118 Rotating Axis

[0173] 119 racks

[0174] 120 auxiliary racks

[0175] 121 Piston

[0176] 122 Inhalation tube

[0177] 123 Discharge pipe.

Claims

1. A compressor, characterized in that: The sealed ferrous container contains a compression mechanism for compressing refrigerant and an electric mechanism for driving the compression mechanism. The compression mechanism has a rotating shaft and a frame supporting the rotating shaft. The base material of the frame supporting the rotating shaft is a light metal with a specific gravity of less than 5, primarily composed of light metals. A component primarily composed of iron is pre-fixed to the outer periphery of the frame. By ensuring that the component primarily composed of iron does not protrude from the outer periphery of the frame, and with the component primarily composed of iron fixed to the frame, the frame is housed into the iron-based container without being embedded or pressed in. The frame is fixed to the iron-based container by welding and fixing the component, which is mainly composed of iron, to the iron-based container.

2. The compressor as described in claim 1, characterized in that: The frame is provided with holes for fixing components with helical threaded grooves, so as to screw the components, which are mainly composed of iron, together.

3. The compressor as described in claim 2, characterized in that: The screwed component, which is mainly composed of iron, is used as a bolt component.

4. The compressor as described in claim 3, characterized in that: The bolt component has a through hole.

5. The compressor as described in claim 3, characterized in that: The relationship between the diameter A of the bolt head of the bolt component and the diameter B of the through hole for welding provided in the iron-based container satisfies A > B.

6. The compressor as described in claim 3, characterized in that: The relationship between the engagement length L of the bolt component and the diameter D of the threaded portion satisfies 0.4≤L / D≤8.

7. The compressor as described in claim 4, characterized in that: The component fixing hole provided on the frame is provided with a through hole that communicates with the internal space of the iron container.

8. The compressor as described in any one of claims 1 to 7, characterized in that: The base material of the compression section forming component is a material with light metal as the main component.

9. A device, characterized in that: The compressor, condenser, pressure reducing device, and evaporator according to any one of claims 1 to 8 are connected in a ring shape by piping.

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