Compressor

Abstract

To suppress deformation of a part of a base member in the vicinity of a welded part during welding and reduce manufacturing costs.SOLUTION: A compressor includes a base member welded to a compressor body container and supporting the compressor body container. The base member has a placement surface on which a bottom shell of the compressor body container is placed, and a circular opening into which the bottom shell is fitted is formed in a center of the placement surface. A plurality of welded parts are formed on the same circumference along a circumferential direction of the opening between an outer peripheral edge of the placement surface and an opening edge of the opening in the base member, and the base member is boded to the bottom shell by the plurality of welded parts. At least one of the plurality of welded parts includes a spot-shaped first welding element, and a spot-shaped second welding element adjacent to the first welding element in a circumferential direction of the opening. When a distance between the first welding element and the second welding element is L1 and a circumferential length of the same circumference is C, a formula of 0<(L1 / C)≤0.12 (Formula 1) is satisfied.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a compressor. [Background technology]

[0002] A known compressor has a compressor main body container that contains a compression unit that compresses a refrigerant and a motor that drives the compression unit, and the compressor main body container is supported by a base member. The base member included in this type of compressor has a mounting surface on which the bottom shell of the compressor main body container is placed, and the center of the bottom shell of the compressor main body container is fitted into a circular opening formed in the center of the mounting surface, and the bottom shell and the base member are welded together (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6569488 [Patent Document 2] Japanese Patent Application Publication No. 2023-142291 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned base member has a plurality of welds formed at intervals around the edge of the opening, and heat applied to the welds during welding can cause deformation of the portions between adjacent welds along the edge of the opening. Such deformation of the base member can lead to the formation of a gap between the bottom shell of the compressor main vessel and the mounting surface of the base member. When a gap forms between the bottom shell and the mounting surface of the base member, the base member is more likely to vibrate. As the compressor main vessel vibrates during operation, the base member resonates at the gap, increasing noise.

[0005] One technique to solve this problem is to provide multiple welds between the opening edge and outer periphery of the base member, each extending a predetermined length in the circumferential direction of the opening (see Patent Document 2). This prevents deformation of the base member between adjacent welds in the circumferential direction when welding the base member to the compressor main body container, thereby suppressing the occurrence of resonance during compressor operation. However, with this prior art, it is necessary to weld each weld so that it is continuous over a predetermined length in the circumferential direction when forming the individual welds, which results in a problem of increased consumption of welding material and increased manufacturing costs required for the welding process.

[0006] The disclosed technology has been developed in consideration of the above, and aims to provide a compressor that can suppress deformation of the portion of the base member near the weld when welding the base member to the compressor main body container, and that can reduce manufacturing costs. [Means for solving the problem]

[0007] One aspect of the compressor disclosed herein is a compressor including a vertically-mounted cylindrical compressor main container, a compression unit disposed within the compressor main container for compressing a refrigerant, and a motor disposed within the compressor main container for driving the compression unit. The compressor main container also includes a base member welded to the compressor main container to support the compressor main container. The compressor main container has a cylindrical main shell and a bottom shell that closes the lower end of the main shell. The base member has a mounting surface on which the bottom shell is placed. A circular opening is formed in the center of the mounting surface, into which the central portion of the bottom shell is fitted. A plurality of welds are formed on the same circumference along the circumferential direction of the opening between the outer periphery of the mounting surface of the base member and the edge of the opening, and the base member is joined to the bottom shell by the plurality of welds. At least one of the plurality of welds includes, as welding elements, a spot-shaped first welding element and a spot-shaped second welding element circumferentially adjacent to the first welding element, and satisfies 0<(L1 / C)≦0.12 (Equation 1), where L1 is the distance between the first welding element and the second welding element and C is the circumferential length of the same circumference. [Effects of the Invention]

[0008] According to one aspect of the compressor disclosed in the present application, deformation of the portion of the base member near the welded portion when welding the base member and the compressor main body container can be suppressed, and manufacturing costs can be reduced. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an external view showing a rotary compressor according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing a base member included in the rotary compressor of the first embodiment, viewed from above. [Figure 3] FIG. 3 is a perspective view showing the bottom shell in the first embodiment from above. [Figure 4] FIG. 4 is a plan view showing the base member in the first embodiment from the bottom side. [Figure 5] FIG. 5 is an enlarged plan view showing a welded portion of the base member in the first embodiment. [Figure 6] FIG. 6 is an enlarged plan view showing welded portions of the base members in the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing a welded portion between base members in Example 1. As shown in FIG. [Figure 8] FIG. 8 is a graph showing the relationship between the first ratio (L1 / C) and the amount of deformation due to heat during welding in Example 1. [Figure 9] FIG. 9 is a graph showing the relationship between the second ratio (L2 / C) and the amount of deformation due to a constant load in Example 1. [Figure 10] FIG. 10 is a plan view showing the welded portion of Comparative Example 1. As shown in FIG. [Figure 11] FIG. 11 is a plan view showing the welded portion of Comparative Example 2. As shown in FIG. [Figure 12] FIG. 12 is a diagram comparing the amount of deformation in the Z direction caused by heat during welding for Example 1, Comparative Example 1, and Comparative Example 2. [Figure 13]FIG. 13 is a graph showing the relationship between inertance and frequency for Example 1, Comparative Example 1, and Comparative Example 2. [Figure 14] FIG. 14 is a plan view showing the base member in the second embodiment from the bottom. [Figure 15] FIG. 15 is a plan view showing the base member in the third embodiment from the bottom. [Figure 16] FIG. 16 is an enlarged plan view showing a welded portion of a base member in Example 3. As shown in FIG. [Figure 17] FIG. 17 is a plan view showing the base member in the fourth embodiment from the bottom. [Figure 18] FIG. 18 is a plan view showing the base member in the fifth embodiment from the bottom. [Figure 19] FIG. 19 is an enlarged plan view showing a welded portion of the base member in Example 5. As shown in FIG. [Figure 20] FIG. 20 is a plan view illustrating a modified example of the arrangement of welding elements in a welded portion. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the compressor disclosed in the present application will be described in detail with reference to the drawings. However, the compressor disclosed in the present application is not limited to the following embodiments. [Example]

[0011] (Structure of a rotary compressor) FIG. 1 is an external view showing a rotary compressor of a first embodiment. As shown in FIG. 1, the rotary compressor 1 includes a vertical cylindrical compressor main vessel 10, an accumulator 11, and a base member 12 that supports the compressor main vessel 10. The vertical cylindrical compressor main vessel 10 contains a compression section 14 that draws in refrigerant from the accumulator 11 through a compression section suction pipe 102 and a connecting pipe 104, compresses the refrigerant, and discharges the compressed refrigerant into the compressor main vessel 10, as well as a motor 15 that drives the compression section 14. The rotary compressor 1 is an internal high-pressure hermetic compressor that discharges high-pressure refrigerant compressed in the compression section 14 into the compressor main vessel 10 and further discharges it through a discharge pipe 107.

[0012] As shown in FIG. 1, the compressor main vessel 10 has a cylindrical main shell 10a, a cup-shaped top shell 10b, and a cup-shaped bottom shell 10c. The main shell 10a, top shell 10b, and bottom shell 10c of the compressor main vessel 10 are formed of metal materials. The compressor main vessel 10 is formed by welding the top shell 10b to the upper end of the main shell 10a and welding the bottom shell 10c to the lower end of the main shell 10a. The accumulator 11 is fixed to the main shell 10a of the compressor main vessel 10 by a fixing bracket 13. A base member 12 is welded to the bottom shell 10c of the compressor main vessel 10.

[0013] (Base member and bottom shell structure) Fig. 2 is a perspective view showing the base member 12 provided in the rotary compressor 1 of the embodiment 1 from above. Fig. 3 is a perspective view showing the bottom shell 10c in the embodiment 1 from above.

[0014] As shown in FIG. 2, the base member 12 in this embodiment is formed into a tray shape by pressing a metal material having a thickness of t [mm] (see FIG. 7). The base member 12 has a mounting surface 18, an opening 19, and a plurality of legs 22. The base member 12 supports the compressor main body container 10 from below by placing the bottom shell 10c of the compressor main body container 10 on the mounting surface 18. The mounting surface 18 is formed to fit along a bottom surface portion 10ca (contact surface portion 10ca1) of the bottom shell 10c (described later). The mounting surface 18 of the base member 12 and the bottom shell 10c are in contact with each other over the entire circumferential direction of the opening 19 (hereinafter simply referred to as the circumferential direction). This prevents a gap from being formed between the bottom shell 10c and the mounting surface 18 of the base member 12. In this embodiment, the mounting surface 18 is formed in a generally circular shape with an opening 19 formed in its center, and is gently inclined downward toward the center O of the opening 19. The mounting surface 18 of the base member 12 comes into contact with the outer peripheral surface of the bottom shell 10c, so that the bottom shell 10c placed on the mounting surface 18 can be supported by the entire mounting surface 18, and vibrations occurring in the base member 12 can be suppressed.

[0015] Three legs 22 are integrally formed on the outer periphery of the base member 12. The three legs 22 are formed so as to continue from the annular mounting surface 18 and extend radially outward from the opening 19, protruding from an outer peripheral edge 18a of the mounting surface 18 toward the outer periphery of the mounting surface 18. The three legs 22 are arranged at equal intervals in the circumferential direction of the opening 19. Each leg 22 has a circular mounting hole 22a formed therein that penetrates the base member 12, into which the upper end of an elastic member 26 is fitted, for example. The elastic member 26 is made of, for example, a cylindrical rubber material. With the elastic members 26 attached to the legs 22, the base member 12 is supported via the elastic members 26 on an installation surface such as the bottom plate of an outdoor unit (not shown). In addition, the base member 12 has an outer peripheral rising portion 24 formed thereon that extends from the outer peripheral edge of the base member 12 along the central axis direction passing through the center O of the opening 19, thereby increasing the mechanical strength of the base member 12.

[0016] As shown in Fig. 2, a circular opening 19 is formed in the center of the mounting surface 18 of the base member 12. A fitting portion 10ca2 formed in the center of a bottom surface portion 10ca of a bottom shell 10c (described later) is fitted into the opening 19 of the base member 12. The bottom shell 10c of the compressor main body container 10 is positioned at a predetermined position relative to the mounting surface 18 by fitting the fitting portion 10ca2 of the bottom surface portion 10ca of the bottom shell 10c (described later) into the opening 19 of the mounting surface 18. In the first embodiment, a contact surface portion 10ca1 of the bottom surface portion 10ca of the bottom shell 10c (described later) is in contact with an opening edge 19a of the opening 19 of the base member 12.

[0017] As shown in FIGS. 1 and 3, the bottom shell 10c of the compressor main body container 10 has a U-shaped (cup-shaped) cross section. The bottom shell 10c of the embodiment has a generally disk-shaped bottom surface portion 10ca and a cylindrical portion 10cb extending upward from the outer periphery of the bottom surface portion 10ca. The bottom surface portion 10ca of the bottom shell 10c is gently inclined downward toward the center. The bottom surface portion 10ca of the bottom shell 10c also has a contact surface portion 10ca1 that rests on the mounting surface 18 of the base member 12 and a fitting portion 10ca2 that fits into the opening 19 of the base member 12. The fitting portion 10ca2 protrudes slightly downward so that the outer surface of the fitting portion 10ca2, i.e., the outer periphery (bottom surface) of the bottom shell 10c, contacts the opening edge 19a of the opening 19 of the base member 12. The base member 12 is in contact with the outer peripheral surface of the bottom shell 10c around the entire periphery of the opening edge 19a of the opening 19, preventing resonance caused by a gap between the opening edge 19a and the bottom shell 10c.

[0018] (Welding holes) 2, a plurality of circular welding holes 21 for joining the base member 12 and the bottom shell 10c are formed on the mounting surface 18 of the base member 12, aligned in the circumferential direction of the opening 19, between the outer peripheral edge 18a of the mounting surface 18 and the opening edge 19a of the opening 19 in the radial direction of the mounting surface 18. The welding holes 21 are through holes that penetrate from the upper surface to the lower surface of the mounting surface 18 of the base member 12.

[0019] In Example 1, each welding hole 21 is located on the same circumference A with the same radius from the center O of the opening 19. The shape of the welding holes 21 is not limited to a circular shape, and may be other shapes such as a rectangle or a triangle, similar to the contour shape of each welding element 25 in the welding portion 23 described later. Also, although an explanation of the distance between each welding hole 21 will be omitted here, the holes are formed in the same manner as the welding elements 25 in the welding portion 23 described later.

[0020] (weld) Fig. 4 is a plan view showing the base member 12 in Example 1 from below, illustrating the welded portion 23 of the base member 12. Fig. 5 is a plan view showing an enlarged view of the welded portion 23 of the base member 12 in Example 1. Fig. 6 is a plan view showing an enlarged view of the welded portions 23 of the base member 12 in Example 1. Fig. 7 is a cross-sectional view showing the welded portion 23 between the bottom shell 10c and the base member 12 in Example 1.

[0021] 4, 5, and 6, a plurality of welds 23 are formed on the same circumference A along the circumferential direction of the opening 19 between the outer peripheral edge 18a of the mounting surface 18 of the base member 12 and the opening edge 19a of the opening 19. The welds 23 are formed at intervals in the circumferential direction of the opening 19. In Example 1, the same circumference A is located near the center of the opening 19 in the radial direction, as an example.

[0022] Each welded portion 23 includes a plurality of weld elements 25 (25a, 25b) that are welded locations (welded areas). As an example of the plurality of weld elements 25, one welded portion 23 includes a first weld element 25a in the shape of a circular spot and a second weld element 25b in the shape of a circular spot adjacent to the first weld element 25a in the circumferential direction of the opening 19.

[0023] In Example 1, as an example, each of the multiple welds 23 has two weld elements 25a and 25b as the multiple weld elements 25. By making the number of the multiple weld elements 25 in each weld 23 equal, the joint strength of each weld 23 is made equal. Note that Example 1 illustrates a structure in which each of the multiple welds 23 has the same number of weld elements 25, but this is not limited thereto. Each of the multiple welds 23 may have two or more weld elements 25. For example, the number of weld elements 25 in each of the multiple welds 23 may be different. Furthermore, the contour shape of each weld element 25 in the weld 23 is not limited to a circular shape and may be other shapes such as a square or a triangle. In this example, the spot-shaped weld elements 25 are dot-shaped welded areas that do not extend continuously around the circumferential direction of the opening 19.

[0024] As shown in FIGS. 4 and 7 , in the first embodiment, a plurality of welding holes 21 are formed in the mounting surface 18 of the base member 12. The welding elements 25 of each welding portion 23 are formed to connect the mounting surface 18 of the base member 12 and the bottom shell 10c through the welding holes 21. The welding elements 25 are formed, for example, by arc welding the contact portion between the bottom shell 10c and the mounting surface 18 of the base member 12. In the first embodiment, since the welding holes 21 are formed in the base member 12, when forming the welding portions 23 by arc welding, the electrode of a welding torch (not shown) can be brought close to the contact portion between the bottom shell 10c and the mounting surface 18 through the welding holes 21. The bottom shell 10c of the compressor main vessel 10 and the base member 12 are joined by each welding portion 23 having a plurality of welding elements 25 formed on the same circumference A.

[0025] The welding method for forming the weld element 25 of the welded portion 23 is not limited to arc welding, and may be spot welding, projection welding, etc. In the case of projection welding, although not shown, a protrusion for welding is formed on the mounting surface 18 of the base member 12 or on the bottom surface of the contact surface portion 10ca1 of the bottom shell 10c that comes into contact with the mounting surface 18.

[0026] Furthermore, each of the multiple welds 23 is disposed adjacent to the base end 22b side of each leg 22 (toward the outer peripheral edge 18a of the mounting surface 18) in the circumferential direction of the same circumference A. By disposing the welds 23 close to the vicinity of the legs 22, which have high mechanical strength, on the mounting surface 18 of the base member 12, deformation of the portion near the welds 23 (deformation of the mounting surface 18) is suppressed compared to a structure in which the welds 23 are disposed away from the legs 22, and the joining strength of the welds 23 can be further increased.

[0027] As shown in FIGS. 4 and 5, in each welded portion 23, when the distance between the first welding element 25a and the second welding element 25b is L1 [mm] and the circumferential length of the same circumference A is C [mm], the first ratio (L1 / C) is 0<(L1 / C)≦0.12 (Formula 1) Meet the following.

[0028] 5, distance L1 in Example 1 is the linear distance between two points: point P1, which is the end of first welding element 25a on the same circumference A that faces second welding element 25b, and point P2, which is the end of second welding element 25b on the same circumference A that faces first welding element 25a. In other words, distance L1 approximately coincides with the distance between first welding element 25a and second welding element 25b when viewed from the top-bottom direction of base member 12 (the direction of the central axis of opening 19). Therefore, one weld 23 refers to a collection (welding group) of multiple welding elements 25 arranged so as to satisfy distance L1 from each other.

[0029] Fig. 8 is a graph showing the relationship between the first ratio (L1 / C) and the amount of deformation due to heat during welding in Example 1. In Fig. 8, the horizontal axis represents the first ratio (L1 / C) in [%], and the vertical axis represents the amount of deformation [mm] of the portion of base member 12 near welded portion 23.

[0030] As shown in FIG. 8, in Example 1, when the first ratio (L1 / C) is less than 12%, the amount of deformation due to heat during welding is kept to about 0.01 mm, but when the first ratio (L1 / C) exceeds 12%, the amount of deformation due to heat during welding suddenly exceeds 0.01 mm and becomes large. This is presumably because, when the above-mentioned distance L1 between two circumferentially adjacent welding elements (first welding element 25a and second welding element 25b) of the multiple welding elements 25 included in one welded portion 23 is small, that is, when the first ratio (L1 / C) is less than 12% as in Example 1, the circumferentially adjacent first welding element 25a and second welding element 25b act as a single continuous welded portion 23 and behave as if they were a welded portion 23 having a circumferential length of L1, and sufficient joint strength is obtained so that they do not deform even under the heat during welding. On the other hand, when the above-mentioned distance L1 between two circumferentially adjacent welding elements (first welding element 25a and second welding element 25b) of the multiple welding elements 25 included in one welded portion is large, that is, when the first ratio (L1 / C) exceeds 12% as in Comparative Example 2, the circumferentially adjacent first welding element 25a and second welding element 25b act as independent, separate welded portions, resulting in insufficient joint strength and allowing them to easily deform under the heat during welding. Therefore, in Example 1, by forming weld 23 so that first ratio (L1 / C) satisfies Equation 1, the joint strength of weld 23 can be appropriately ensured, and deformation of the portion of base member 12 near weld 23 due to heat during welding can be suppressed, and the amount of deformation can be kept to, for example, 0.10 mm or less. Furthermore, weld 23 is formed by so-called spot-shaped weld elements 25 without extending in the circumferential direction of opening 19, thereby reducing the amount of welding material consumed and the manufacturing costs required for the welding process.

[0031] In Example 1, when viewed from the top and bottom of base member 12, the center of first welding element (welding area) 25a and the center of second welding element (welding area) 25b are located on the same circumference A. Also, in Example 1, the distances L1 in the three welds 23 are equal.

[0032] 4 and 5 , in each of the plurality of welds 23, the circumferential length of the same circumference A is defined as C [mm] as described above, and the distance between point P3, which is one circumferential end of opening 19 on the same circumference A in one welded portion 23 (the end of first welding element 25a in the direction away from second welding element 25b), and point P4, which is the other circumferential end of opening 19 on the same circumference A in this welded portion 23 (the end of second welding element 25b in the direction away from first welding element 25a), is defined as L2 [mm]. In this case, in each of the plurality of welds 23, when the distance between point P3, which is the other circumferential end of first welding element 25a located on one circumferential end side on the same circumference A, and point P4, which is the one circumferential end of second welding element 25b located on the other circumferential end side on the same circumference A, is defined as L2 [mm], the second ratio (L2 / C) is 0.04≦(L2 / C) (Formula 2) Meet the following.

[0033] Distance L2 in Example 1 is the distance between point P3, which is one circumferential end of first welding element 25a, and point P4, which is the other circumferential end of second welding element 25b, and is the linear distance connecting two points, P3, which is one circumferential end of first welding element 25a, and point P4, which is the other circumferential end of second welding element 25b, when viewed from the top and bottom of base member 12. Distance L2 also corresponds to the weld length of welded portion 23 made up of multiple welding elements 25. Although not shown, the distance between welding holes 21 in base member 12 is also formed to satisfy the above-mentioned distances L1 and L2.

[0034] FIG. 9 is a graph showing the amount of vertical deformation of the base member 12, which is welded with multiple welds 23 and receives a constant load equivalent to the weight of the compressor main body casing 10, when the second ratio (L2 / C) is changed in Example 1. In FIG. 9, the horizontal axis represents the second ratio (L2 / C) in % and the vertical axis represents the amount of vertical deformation (mm) of the portion of the base member 12 near the welds 23. The amount of deformation shown in FIG. 9 is the amount of deformation in the central axis direction of the opening 19 (the vertical direction of the bottom shell 10c) at the mounting surface 18 when a constant load (approximately 160 N) is applied to the base member 12. The constant load (approximately 160 N) applied to the base member 12 corresponds to the weight of the compressor main body casing 10 with the motor 15 and the compression unit 14 mounted therein. In FIG. 9, Example 1 is shown by a solid line, Comparative Example 1 is shown by a dashed line, and Comparative Example 2 is shown by a dashed line. In addition, in FIG. 9, an auxiliary line indicating the boundary condition when the deformation due to a constant load is suppressed more than that in Comparative Example 2 is drawn at the position where the second ratio (L2 / C) is 4% (0.04).

[0035] Fig. 10 is a plan view showing the welded portion 123 of Comparative Example 1. As shown in Fig. 10, in Comparative Example 1, six spot-like (dot-like) welded portions 123 are formed at equal intervals in the circumferential direction of the opening between the opening edge of the opening and the outer periphery of the mounting surface. In Comparative Example 1, as shown in Fig. 9, the amount of deformation under a constant load is about 0.40 mm.

[0036] FIG. 11 is a plan view showing a weld 223 of Comparative Example 2. In Comparative Example 2, three arc-shaped welds 223 are formed at intervals in the circumferential direction of the opening, extending along the edge of the opening of the base member. The length of each of the three welds 223 in Comparative Example 2 extending in the circumferential direction of the opening is approximately the same as the weld length L2 of each weld 23 in Example 1, where (L2 / C) is approximately 0.10. As shown in FIG. 9, in Comparative Example 2, the amount of deformation due to a constant load (approximately 160 N) is approximately 0.22 mm, which is less than that of Comparative Example 1.

[0037] 9, it can be confirmed that in Example 1, when the second ratio (L2 / C) is 4% or more, the amount of deformation due to a certain load can be suppressed to 0.2 mm or less (less than the amount of deformation in Comparative Example 2). In other words, in Example 1, because the second ratio (L2 / C) is 4% or more, the amount of deformation due to a load equivalent to the weight of the compressor main body container 10 can be suppressed more than in Comparative Example 2, in which the welded portion is formed to extend in the circumferential direction along the opening edge. In other words, the mechanical strength of the base member 12, which serves as a support member for supporting the compressor main body container 10, can be ensured more than in Comparative Example 2.

[0038] Therefore, in the welded portion 23 in Example 1, the multiple welded elements 25, including the first welded element 25a and the second welded element 25b, are arranged close to each other so as to satisfy Formula 1, and further satisfy Formula 2, so that the multiple welded elements 25 behave as if they were welded portion 23 extending continuously in the circumferential direction for a length of L2. Therefore, even if a load similar to that of an existing rotary compressor (compressor main body container) is applied to the base member 12, the joint strength of each welded portion 23 can be ensured to be equal to or greater than that of an existing rotary compressor, and deformation of the compressor main body container 10 due to the load can be sufficiently suppressed.

[0039] As shown in FIG. 6, when the distance between the plurality of welds 23 is L2 [mm] as described above and the distance between the welds 23 adjacent to each other in the circumferential direction of the same circumference A is D [mm], D>L2...(Formula 3) That is, in Example 1, 0.04≦(L2 / C)<(D / C) is satisfied.

[0040] Here, distance D is the shortest distance between one welded portion 23 (first welded portion 23a) and another welded portion 23 (second welded portion 23b) that is adjacent to the first welded portion 23a in the circumferential direction on the same circumference A. In other words, in two welded portions 23 (first welded portion 23a, second welded portion 23b) that are adjacent to each other in the circumferential direction, distance D is the distance between point P3, which is the end of one welded portion 23 (first welded portion 23a) that is closer to the other welded portion 23 (second welded portion 23b) (i.e., the end of first welded element 25a of first welded portion 23a that is closer to second welded portion 23b), and point P5, which is the end of the other welded portion 23 (second welded portion 23b) that is closer to one welded portion 23 (first welded portion 23a) (i.e., the end of second welded element 25b of second welded portion 23b that is closer to first welded portion 23a). In other words, when viewed from the top and bottom of the base member 12, it is the straight-line distance connecting two points: point P3 at one end of the first welding element 25a of one welding portion 23 and point P5 at the other end of the second welding element 25b of another welding portion 23 adjacent to it in the circumferential direction.

[0041] By ensuring that the distance D of the multiple welds 23 satisfies Equation 3, the number of welds 23 formed on the base member 12 can be reduced, thereby reducing the workload during the welding process, while still ensuring the appropriate joint strength obtained by the multiple welds 23.

[0042] Furthermore, when the circumferential length of the same circumference A of the opening 19 of the base member 12 is C [mm] as described above and the circumferential length of the circular opening edge 19a is E [mm], the third ratio (C / E) is 1<(C / E)≦3 (Formula 4) Meet the following.

[0043] In the multiple welds 23 of Example 1, even if the mechanical strength of base member 12 is low because the size of opening 19 occupies a large proportion of mounting surface 18 of base member 12 (i.e., the size of opening 19 satisfies Equation 4), first welding element 25a and second welding element 25b have welds 23 that satisfy the above-mentioned Equation 1, so that the joint strength of welds 23 can be appropriately ensured. Therefore, deformation of the portions of base member 12 near welds 23 due to heat during welding can be suppressed.

[0044] 12 shows the experimental results of measuring the amount of deformation of the base member occurring in the direction of the central axis (Z) of the opening for the present invention, Comparative Example 1, and Comparative Example 2, which use the same compressor main body casing 10 and base member 12 except for the positions and shapes of the welds, at a position on the circumference with a radius of 41 mm from the center of the opening (near the weld, the position indicated by the dotted line in FIG. 12).

[0045] As shown in FIG. 12, the maximum amount of deformation in the Z direction caused by heat during welding in the base member 12 of Example 1 is approximately 0.09 [mm]. Compared to the maximum amount of deformation in the Z direction caused by heat during welding in the base member of Comparative Example 1, which is 0.25 [mm], it can be seen that the amount of deformation caused by heat during welding has been reduced to less than half.

[0046] When six welds 123 are formed at equal intervals around the circumferential direction of the opening of the base member, as in the welded structure of Comparative Example 1, a large amount of deformation occurs between adjacent welds 123 around the circumferential direction of the opening in the base member, and this large amount of deformation results in a gap between the bottom shell 10c of the compressor main body vessel 10 and the base member. In contrast, in the welded structure of Example 1, in which each weld 23 extends around the circumferential direction of the opening 19 of the base member 12 so as to satisfy Equation 1, the amount of deformation due to heat during welding is small, and this makes it possible to prevent a gap from occurring between the bottom shell 10c of the compressor main body vessel 10 and the base member 12.

[0047] Fig. 13 shows the experimental results of measuring the relationship between inertance [(m / s2) / N] and frequency [Hz] for each of the welded structures of Example 1, Comparative Example 1, and Comparative Example 2. Here, inertance is a value that indicates the ease of resonance with respect to an exciting force at a predetermined frequency. In other words, a large inertance at a certain frequency indicates that vibration is likely to increase at that frequency.

[0048] As shown in Fig. 13, Example 1 can reduce the inertance in the frequency band of approximately 2500 [Hz] to 4000 [Hz] compared to Comparative Examples 1 and 2. In particular, Example 1 does not have the inertance peak that appeared at 2500 [Hz] to 2800 [Hz] in Comparative Examples 1 and 2. The inertance peak at 2500 [Hz] to 2800 [Hz] is a peak that clearly indicates that the base member 12 is resonating due to the vibration caused by driving the compression section 14. This confirms that the occurrence of resonance in the base member 12 is suppressed in Example 1.

[0049] (Effects of Example 1) As described above, in the rotary compressor 1 of the first embodiment, the base member 12 has a mounting surface 18 on which the bottom shell 10c of the compressor main body vessel 10 is placed, and a circular opening 19 into which the central portion of the bottom shell 10c is fitted is formed in the center of the mounting surface 18. A plurality of welds 23 are formed on the same circumference A along the circumferential direction of the opening 19 between the outer peripheral edge 18a of the mounting surface 18 of the base member 12 and the opening edge 19a of the opening 19. At least one of the plurality of welds 23 includes, as welding elements 25, a spot-shaped first welding element 25a and a spot-shaped second welding element 25b adjacent to the first welding element 25a in the circumferential direction of the opening 19, and when the distance between the first welding element 25a and the second welding element 25b is L1 and the circumferential length of the same circumference A is C, a first ratio (L1 / C) satisfies 0<(L1 / C)≦0.12 (Equation 1). In this manner, a plurality of welds 23 are formed on the same circumference A along the circumferential direction of the opening 19 between the outer peripheral edge 18a of the mounting surface 18 of the base member 12 and the opening edge 19a of the opening 19. The first spot-shaped welding elements 25a and the second spot-shaped welding elements 25b included in the welds 23 satisfy Equation 1, thereby ensuring appropriate joint strength of the welds 23 and suppressing deformation of the base member 12 near the welds 23 during welding. As a result, the occurrence of a gap between the bottom shell 10c and the mounting surface 18 is suppressed, thereby suppressing resonance of the base member 12 near the welds 23 due to vibration of the compressor main body casing 10 during operation of the rotary compressor 1, thereby reducing noise due to resonance. Additionally, in the rotary compressor 1, the welds 23 are formed using spot-shaped welding elements 25 that are not continuously extended, thereby reducing the consumption of welding material and the manufacturing costs required for the welding process.

[0050] Furthermore, in the rotary compressor 1 of the first embodiment, when the distance between point P3, which is an end on one circumferential end side of the opening 19 in one welded portion 23, and point P4, which is an end on the other circumferential end side of the opening 19 in this one welded portion 23, is defined as L2, the second ratio (L2 / C) of each of the plurality of welded portions 23 satisfies 0.04≦(L2 / C) (Equation 2). As a result, when a constant load equivalent to that of existing rotary compressor products is applied to the base member 12 by the compressor main body container 10, it is possible to ensure appropriate joint strength of each welded portion 23 equivalent to that of existing rotary compressor products.

[0051] Furthermore, in the rotary compressor 1 of the first embodiment, the multiple welds 23 satisfy D>L2 (Equation 3), where D is the distance between adjacent welds 23 in the circumferential direction of the same circumference A. This reduces the number of welds 23 formed in the base member 12, thereby reducing the workload in the welding process, while ensuring an appropriate joint strength obtained by the multiple welds 23.

[0052] Furthermore, in rotary compressor 1 of embodiment 1, opening 19 of base member 12 has a third ratio (C / E) that satisfies 1<(C / E)≦3 (Equation 4), where E is the circumferential length of circular opening edge 19a. Even if the mechanical strength of base member 12 is low because the size of opening 19 occupies a large proportion of mounting surface 18 of base member 12 (i.e., the size of opening 19 satisfies Equation 4), welded portion 23 of embodiment 1 has first weld element 25a and second weld element 25b that satisfy Equation 1 above, and therefore the joint strength of welded portion 23 can be appropriately ensured.

[0053] Furthermore, in the rotary compressor 1 of the first embodiment, each of the multiple welds 23 is disposed adjacent to the base end 22b of the leg 22 in the circumferential direction of the same circumference A. By disposing the welds 23 close to the vicinity of the leg 22, which has high mechanical strength, on the mounting surface 18 of the base member 12, deformation of the portion near the welds 23 is further suppressed compared to a structure in which the welds 23 are disposed away from the leg 22, and the joining strength of the welds 23 is further increased.

[0054] Other embodiments will be described below with reference to the drawings. In the other embodiments, the base member 12 and the same components as those in the first embodiment are denoted by the same reference numerals as in the first embodiment, and descriptions thereof will be omitted. The other embodiments differ from the first embodiment in the positions of the welded portions 23, the number of welded elements 25 included in one welded portion 23, the positions of the welded elements 25 relative to the same circumference A, etc. [Example]

[0055] 14 is a plan view showing the bottom side of the base member 12 in Example 2. Example 2 differs from Example 1 in the positions of the plurality of welds 23 in the circumferential direction of the opening 19.

[0056] 14, in the base member 12 of Example 2, three welds 23 located on the same circumference A are arranged between the legs 22 in the circumferential direction of the opening 19. In Example 2 as well, the three welds 23 have a distance L1 that satisfies the above-mentioned formula 1, a distance L2 that satisfies the above-mentioned formula 2, and a distance D that satisfies the above-mentioned formula 3.

[0057] In the second embodiment, as in the first embodiment, deformation of the portion of the base member 12 near the welded portion 23 during welding can be suppressed, and the manufacturing cost required for the welding process can be reduced. [Example]

[0058] Fig. 15 is a plan view showing the bottom side of base member 12 in Example 3. Fig. 16 is an enlarged plan view showing welded portions 23 of base member 12 in Example 3. Example 3 differs from Examples 1 and 2 in that the multiple welded portions 23 include welded portions 23 with different numbers of weld elements 25.

[0059] 15, in the base member 12 of Example 3, a welded portion 23 including two welded elements 25, namely, a first welded element 25a and a second welded element 25b, and a welded portion 23 including three welded elements 25, namely, a first welded element 25a, a second welded element 25b, and a third welded element 25c, are formed on the same circumference A. The three welded portions 23 in Example 3 have different distances L2. Furthermore, the distances L1 between the welded portions 23 including two welded elements 25 are also different from each other.

[0060] As shown in FIG. 16, in a welded portion 23 including three welding elements 25, the distance L1 between the first welding element 25a and the second welding element 25b, which are adjacent in the circumferential direction of the opening 19, satisfies the above-mentioned formula 1, and the distance L1 between the second welding element 14b and the third welding element 25c, which are adjacent in the circumferential direction of the opening 19, also satisfies formula 1.

[0061] Furthermore, in welded portion 23 including three welding elements 25, when the distance between point P3, which is an end on one side of the periphery of first welding element 25a located on one circumferential end of opening 19, and point P4, which is an end on the other side of the periphery of third welding element 25c located on the other circumferential end, is defined as L2, distance L2 satisfies the above-mentioned formula 2. Furthermore, although not shown, between welded portions 23 adjacent in the circumferential direction on the same circumference A, distance D satisfies the above-mentioned formula 3. Note that the number of welding elements 25 may be four or more as long as welded portion 23 satisfies formula 2 (see FIG. 19).

[0062] In this way, by having three welds 23 with different numbers of weld elements 25, it becomes possible to shift the resonance frequencies at which the portions of the base member 12 near each weld 23 resonate among the multiple welds 23. This prevents simultaneous resonance in the portions near all welds 23, further suppressing vibration of the base member 12 when resonance occurs in the portions near the welds 23.

[0063] According to the third embodiment, similarly to the first and second embodiments, deformation of the portion of the base member 12 near the welded portion 23 during welding can be suppressed, and the manufacturing cost required for the welding process can be reduced. [Example]

[0064] 17 is a plan view showing the bottom side of the base member 12 in Example 4. Example 4 differs from Examples 1 to 3 in the number of welded portions 23.

[0065] 17, four welds 23 are formed on the base member 12 in Example 4, and the two weld elements 25 included in each weld 23 are formed on the same circumference A. The four welds 23 are formed at intervals in the circumferential direction of the opening 19. In Example 4 as well, the four welds 23 have a distance L1 that satisfies the above-mentioned formula 1, a distance L2 that satisfies the above-mentioned formula 2, and a distance D that satisfies the above-mentioned formula 3.

[0066] In the fourth embodiment, as in the first to third embodiments, deformation of the portion of the base member 12 near the welded portion 23 during welding can be suppressed, and the manufacturing cost required for the welding process can be reduced. [Example]

[0067] Fig. 18 is a plan view showing the bottom side of base member 12 in Example 5. Fig. 19 is an enlarged plan view showing welded portions 23 of base member 12 in Example 5. Example 5 differs from Examples 1 to 4 in the positions of multiple welded portions 23 in the radial direction of opening 19 (positions on the same circumference A).

[0068] As shown in Figure 18, in the base member 12 of Example 5, the same circumference A on which three welds 23 are formed is located closer to the outer peripheral edge 18a than the central circumference B that passes through the center between the outer peripheral edge 18a of the mounting surface 18 and the opening edge 19a of the opening 19, and is located in the vicinity of the outer peripheral edge 18a.

[0069] In this way, the same circumference A on which multiple welds 23 are formed is positioned closer to the outer peripheral edge 18a than the central circumference B, so that the welds 23 are positioned on the outer peripheral edge 18a side, which has higher mechanical strength than the opening edge 19a side on the mounting surface 18, thereby preventing the mounting surface 18 from being deformed by the heat generated during welding (when forming the welds 23 on the base member 12).

[0070] Furthermore, the base member 12 in Example 5 has different numbers of welding elements 25, with welds 23 including two welding elements 25, welds 23 including three welding elements 25, and welds 23 including four welding elements 25. This makes it possible to shift the resonance frequencies generated in the vicinity of the three welds. This prevents simultaneous resonance in the vicinity of all welds 23, further suppressing vibration of the base member 12 when resonance occurs in the vicinity of the welds 23.

[0071] In Example 5, in each welded portion 23, the distance L1 satisfies the above-mentioned formula 1, the distance L2 satisfies the above-mentioned formula 2, and the distance D satisfies the above-mentioned formula 3.

[0072] As shown in FIG. 19, in a welded portion 23 including four welding elements 25, the distance L1 between the first welding element 25a and the second welding element 25b that are adjacent in the circumferential direction of the opening 19, the distance L1 between the second welding element 14b and the third welding element 25c that are adjacent in the circumferential direction of the opening 19, and the distance L1 between the third welding element 14c and the fourth welding element 25d that are adjacent in the circumferential direction of the opening 19 satisfy Equation 1.

[0073] Furthermore, in welded portion 23 including four welding elements 25, when the distance between point P3, which is an end on one side of the periphery of first welding element 25a located on one circumferential end of opening 19, and point P4, which is an end on the other side of the periphery of fourth welding element 25d located on the other circumferential end, is defined as L2, distance L2 satisfies the above-mentioned formula 2. Furthermore, although not shown, in welded portion 23 including four welding elements 25, distance D between welded portions 23 adjacent in the circumferential direction on the same circumference A satisfies the above-mentioned formula 3.

[0074] In the fifth embodiment, as in the first to fourth embodiments, deformation of the portion of the base member 12 near the welded portion 23 during welding can be suppressed, and the manufacturing cost required for the welding process can be reduced.

[0075] (Modification of the arrangement of welding elements) 20 is a plan view illustrating a modified example of the arrangement of welding elements 25 in welding portion 23. In the above-described first to fifth embodiments, the centers of the welding elements (welding regions) 25 of welding portion 23 are located on the same circumference A, but the arrangement is not limited to this. The welding portion 23 of the modified example differs from the first to fifth embodiments in that it includes welding elements 25 that are shifted in position in the radial direction of opening 19 relative to the same circumference A.

[0076] As shown in FIG. 20, the modified weld portion 23 includes a first weld element 25a, a second weld element 25b, and a third weld element 25c, and the first weld element 25a and the third weld element 25c are positioned differently relative to the radial direction of the opening 19 and are formed to be tangent to the same circumference A.

[0077] The center of first welding element 25a is located radially inside opening 19 with respect to the same circumference A, and the outer portion of first welding element 25a in the radial direction of opening 19 overlaps with the same circumference A. The center of second welding element 25b is located on the same circumference A. The center of third welding element 25c is located radially outside opening 19 with respect to the same circumference A, and the inner portion of third welding element 25c in the radial direction of opening 19 overlaps with the same circumference A.

[0078] In the present disclosure, an arrangement in which a part of the welding area is in contact with (overlaps with) the same circumference A, such as the first welding element 25a and the third welding element 25c of the modified welding portion 23, is also defined as being located on the same circumference A. In addition, in the present disclosure, an arrangement in which the periphery of the welding element 25 is located on the same circumference A, that is, an arrangement in which the periphery is circumscribed or inscribed on the same circumference A, is also defined as being located on the same circumference A.

[0079] The distance L1 in the welded portion 23 of the modified example, when viewed from the vertical direction of the base member 12 (the direction of the central axis of the opening 19), is the distance L1 between the first welding element 25a and the second welding element 25b that are adjacent in the circumferential direction of the opening 19, and is the straight-line distance connecting two points, point P1A which is the end on one end side of the first welding element 25a and point P2A which is the end on one end side of the second welding element 25b, on a line connecting the center of the first welding element (welded area) 25a and the center of the second welding element (welded area) 25b, and satisfies the above-mentioned formula 1. Similarly, the distance L1 between the second welding element 25b and the third welding element 25c that are adjacent in the circumferential direction of the opening 19 is the straight-line distance connecting two points, point P1B which is an end on one side of the second welding element 25b and point P2B which is an end on one side of the third welding element 25c, on a line connecting the center of the first welding element (welding area) 25a and the center of the second welding element (welding area) 25b, and satisfies the above-mentioned formula 1.

[0080] In welded portion 23 of the modified example, when the distance between point P3, which is an end on one side of the periphery of first welding element 25a located on one circumferential end of opening 19, and point P4, which is an end on the other side of the periphery of third welding element 25c located on the other circumferential end, i.e., the straight-line distance connecting points P3 and P4, is L2, distance L2 satisfies the above-mentioned formula 2. Furthermore, although not shown, in welded portion 23 of the modified example, distance D between welded portions 23 adjacent in the circumferential direction on the same circumference A satisfies the above-mentioned formula 3.

[0081] The welded portion 23 of the modified example includes three welded elements 25, but this does not limit the number of welded elements 25 in the case where the welded elements 25 are located at different radial positions of the opening 19, and is not limited to welded elements 25 whose centers are located on the same circumference A. For example, the welded portion 23 may be formed by only two welded elements 25 located at different radial positions of the opening 19.

[0082] Furthermore, in the modified welded portion 23, each weld element 25 can be easily formed by, for example, slightly moving the electrode of the welding torch in the radial direction of the opening 19 during arc welding.

[0083] As in the first to fifth embodiments, the welded portion 23 of the modified example also prevents the portion of the base member 12 near the welded portion 23 from being deformed during welding, and reduces the manufacturing cost required for the welding process. [Explanation of symbols]

[0084] 1 Rotary compressor (compressor) 10 Compressor main body container 10a Main Shell 10c bottom shell 12 Base member 14 Compression section 15 Motor 18 Placement surface 18a outer edge 19 Opening 19a Opening edge 21 Welding holes 22 Legs 22b Proximal end 23 Welded section 25 Welding Elements 25a First welding element 25b Second welding element P1, P2 points (one end) P1A, P1B, P2A, P2B points (one end) P3 point (one end) Point P4 (other end) A Circumference (same circumference) B. Central circumference (circumference passing through the center between the outer edge and the opening edge) C Circumference D distance E Circumference length L1 distance L2 distance (L1 / C) 1st ratio (L2 / C) 2nd ratio (C / E) 3rd ratio

Claims

1. A compressor including a vertically placed cylindrical compressor main body container, a compression unit disposed in the compressor main body container and compressing a refrigerant, and a motor disposed in the compressor main body container and driving the compression unit, a base member welded to the compressor main body container to support the compressor main body container, The compressor main body container has a cylindrical main shell and a bottom shell that closes a lower end side of the main shell, the base member has a mounting surface on which the bottom shell is placed, a circular opening into which the center of the bottom shell is fitted is formed at the center of the mounting surface; a plurality of welds are formed on the same circumference along the circumferential direction of the opening between the outer peripheral edge of the placement surface of the base member and the opening edge of the opening, and the base member is joined to the bottom shell by the plurality of welds; At least one of the plurality of welds includes, as welding elements, a spot-shaped first welding element and a spot-shaped second welding element adjacent to the first welding element in the circumferential direction, and when a distance between the first welding element and the second welding element is L1 and a circumferential length of the same circumference is C, 0<(L1 / C)≦0.12 (Formula 1) Fill the compressor.

2. Each of the plurality of welds has the first welding element and the second welding element. The compressor according to claim 1 .

3. The plurality of welds include welds having the same number of weld elements or welds having different numbers of weld elements. The compressor according to claim 2 .

4. the same circumference on which the plurality of welds are formed is located on the outer circumferential edge side of a circumference passing through a center between an outer circumferential edge of the placement surface and an opening edge of the opening; The compressor according to claim 2 .

5. When a distance between one end of one of the welded portions in the circumferential direction and the other end of the one of the welded portions in the circumferential direction is L2, 0.04≦(L2 / C) ... (Formula 2) fulfill, The compressor according to claim 2 .

6. When the distance between the welds adjacent to each other in the circumferential direction of the same circumference is D, D>L2...(Formula 3) fulfill, The compressor according to claim 5.

7. When the circumferential length of the circular opening edge is E, the opening has the following characteristics: 1<(C / E)≦3...(Formula 4) fulfill, The compressor according to any one of claims 1 to 6.

8. The first welding element and the second welding element are positioned at different radial positions of the opening and are formed to be in contact with the same circumference. The compressor according to claim 1 .

9. the base member has a plurality of legs that protrude from the outer periphery of the placement surface toward the outer periphery of the placement surface, The plurality of welded portions are arranged adjacent to each other on the base end side of the leg portion in the circumferential direction of the same circumference. The compressor according to claim 1 .

10. The plurality of welds are formed by spot welding, projection welding, or arc welding. The compressor according to claim 1 .

11. The mounting surface of the base member contacts the bottom shell. The compressor according to claim 1 .

12. the mounting surface of the base member and the bottom shell are in contact with each other over the entire circumferential direction. The compressor according to claim 1 .

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