Patent Application
20250237209
The present invention relates to a sealed compressor.
As a sealed compressor, a compressor is known in which a compressing section for compressing a refrigerant and a motor for driving the compressing section are disposed inside a compressor main body container that is supported by a base member, In this type of sealed compressors, the base member has a mounting surface on which the bottom shell of the compressor main body container is mounted; the central part of the bottom shell of the compressor main body container is fit into an opening formed in the center of the mounting surface; and the bottom shell and the base member are joined by means of welding.
In the base member, on the rim of the opening, a plurality of welding spots is formed at intervals along the circumferential direction of the rim of the opening. At the time of performing welding, due to the heat applied to the welding spots, the portions present between the neighboring welding spots undergo deformation along the rim of the opening. Because of such deformation occurring in the base member, there is a risk of formation of a gap between the bottom shell of the compressor main body container and the mounting surface of the base member. In case a gap is formed between the bottom shell and the mounting surface of the base member, the base member becomes prone to vibration, Hence, accompanying the vibration of the compressor main body container during the operation of the sealed compressor, the base member undergoes sympathetic vibration in the portion in which the gap is formed, That results in an increase in the noise attributed to the sympathetic vibration.
The technology disclosed herein is developed in view of the issues explained above, and it is an objective to provide a sealed compressor in which, during the welding of the base member and the compressor main body container, it becomes possible to hold down deformation of the portions present between the neighboring welding spots formed on the base member.
According to an aspect of an embodiments in the present application, a sealed compressor includes; a compressor main body container that is vertically cylindrical in shape; a compressing section that is placed inside the compressor main body container and that compresses a refrigerant; and a motor that is placed inside the compressor main body container and that drives the compressing section, wherein the sealed compressor further comprises a base member that is welded to the compressor main body container and that supports the compressor main body container, the compressor main body container includes a bottom shell, the base member includes a mounting surface on which the bottom shell is mounted, at center of the mounting surface, an opening is formed into which central part of the bottom shell is fit, the base member is joined to the bottom shell by a plurality of welding spots formed at intervals in circumferential direction of the opening, and the plurality of welding spots are formed to extend for a predetermined length in circumferential direction of the opening and are positioned in between outer peripheral border of the mounting surface and opening rim of the opening.
According to one aspect of the sealed compressor disclosed in the application concerned, during the welding of the base member and the compressor main body container, it becomes possible to hold down deformation of the portions present between the neighboring welding spots formed on the base member. As a result, it becomes possible to hold down the occurrence of gaps in the welding spots formed between the base member and the compressor main body container. That enables holding down an increase in the noise attributed to the sympathetic vibration of the base member accompanying the vibration of the compressor main body container.
Exemplary embodiments of a sealed compressor according to the application concerned are described in detail with reference to the accompanying drawings. However, the sealed compressor according to the application concerned is not limited by the embodiments described below.
As illustrated in
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As illustrated in
On the mounting surface 18 of the base member 12, a plurality of slits 21 is formed that extends in the circumferential direction of the opening 19. The slits 21 are through holes that penetrate the mounting surface 18 of the base member 12 from the top face to the bottom face. The slits 21 are formed at intervals on the same circumference along the circumferential direction of the opening 19. In the first embodiment, three slits 21 are positioned on a circumference A (a circle A) that is positioned in a radial direction of the mounting surface 18 and in between an outer peripheral border 18a of the mounting surface 18 and the opening rim 19a of the opening 19. More particularly, in the first embodiment, the circumference A is a circle passing near the midpoint of a line segment joining the outer peripheral border 18a of the mounting surface 18 and the opening rim 19a in a radial direction; and the three slits 21 are formed on that circumference A. Moreover, the slits 21 are formed at regular intervals with respect to the circumferential direction of the circumference A, Meanwhile, neither the positions of the slits 21 in a radial direction of the mounting surface 18 are limited to the explanation given above, nor the number of slits 21 is limited to the explanation given above. For example, the circumference A, on which the slits 21 are formed, can be shifted to one side in a radial direction with respect to the circumference passing through the center of the portion present between the outer peripheral border 18a and the opening rim 19a in a radial direction of the mounting surface 18. Moreover, the number of slits can be equal to or greater than four.
Each slit 21 extends in an arc-like manner along the circumference A that runs along the circumferential direction of the opening 19. In the first embodiment, when viewed from the position of the central point of the circumference A on the central axis passing through the center of the opening 19, the slits 21 are positioned to overlap with the legs 22 (explained later) in the circumferential direction. Meanwhile, the positions and the shapes of the slits 21 are not limited to the explanation given above.
In the direction orthogonal to the circumference A that runs along the circumferential direction of the opening 19, each of the three slits 21 has a slit width W1 [mm] (in the first embodiment, the slit width W1 [mm] in a radial direction of the opening 19) to be equal to or greater than 1.5 times a thickness T [mm] of the mounting surface 18 of the base member 12, That is, W1≤1.5×T holds true. As a result, at the time of forming welding spots 23 (explained later), when the electrode of a welding torch (not illustrated) is moved closer to the contact portions between the bottom shell 10c and the mounting surface 18 of the base member 12 via the slits 21, the electrode of the welding torch can be prevented from colliding with the rim portion of the slits 21, thereby making it easier to form the welding spots 23. In the first embodiment, as an example, the thickness T of the base member 12 at the mounting surface 18 is set to be about 1.7 times the slit width W1 of the slits 21.
When 12 represents the length of a plurality of welding spots 23 (explained later) in the circumferential direction (hereinafter, referred to as the welding length), a slit length L1 of the opening 19 in the circumferential direction is equal to or greater than the length L2 (see
Since the slit length 11 and the welding length 12 satisfy the relationship 11>12 as explained above, at the time of performing welding using the welding spots 23 (explained later), for example, when the electrode of the welding torch (not illustrated) during arc welding is moved closer to the contact portions between the bottom shell 10c of the compressor main body container 10 and the mounting surface 18 of the base member 12, the electrode of the welding torch can be prevented from colliding with the rim portion of the slits 21. That is, the slit length 11 of the slits 21, on which the welding spots 23 are formed, is set to be greater (longer) than the welding length L2, while securing sufficient welding length 12 for maintaining the welding strength at the welding spots 23. That enables achieving improvement in the welding activity. Moreover, the welding spots 23 are formed by avoiding the edges at both ends of the slits 21 at which the electrode of the welding torch is at the risk of not being able to pass through. Hence, it becomes possible to appropriately form the welding spots 23 in such a way that the mounting surface 18 of the base member 12 and the bottom shell 10c of the compressor main body container 10 are linked. As a result, it becomes possible to avoid variability in the joint strength between the bottom shell 10c and the base member 12 using the welding spots 23.
On the outer periphery of the base member 12, the three legs 22 are formed in an integrated manner. The three legs 22 are formed to be continuous from the toric mounting surface 18 and to extend outward in a radial direction of the opening 19. Moreover, the three legs 22 are placed at regular intervals in the circumferential direction of the opening 19. Each leg 22 has an elastic member (not illustrated) attached thereto and is thus supported on an installation surface (not illustrated) via the elastic member. For example, on each leg 22, an attachment hole 22a is formed through the base member 12 so that the upper end of the elastic member (not illustrated) can be fit into the attachment hole 22a. As the elastic member, for example, a columnar rubber material is used.
In an identical manner to the arrangement of the three slits 21, three welding spot 23 are positioned in a radial direction of the mounting surface 18 and in between the outer peripheral border 18a of the mounting surface 18 and the opening rim 19a of the opening 19. More particularly, the three welding spots 23 are formed at regular intervals with respect to the circumferential direction of the circumference A that is present in between the outer peripheral border 18a and the opening rim 19a in a radial direction. Since the welding spots 23 are formed in between the outer peripheral border 18a of the mounting surface 18 and the opening rim 19a of the opening 19; on both sides of the mounting surface 18 sandwiching the welding spots 23 in a radial direction, portions 18b of the mounting surface 18 can be secured. As a result, any deformation occurring around the welding spots 23 (the slits 21) of the base member 12 due to the heat applied during welding can be effectively held down due to the stiffness of the base member 12 itself in the portions 18b secured on both sides of the welding spots 23 (the slits 21). For that reason, it becomes possible to hold down deformation around the welding spots 23 accompanying the welding. Thus, because of the welding spots 23, the bottom face of the bottom shell 10c of the compressor main body container 10 and the mounting surface 18 of the base member 12 can be joined without any gaps. That enables holding down the occurrence of a peculiar phenomenon in which, when there are gaps between the bottom face of the bottom shell 10c and the mounting surface 18 of the base member 12, the base member 12 undergoes sympathetic vibration accompanying the vibration of the compressor main body container 10. Consequently, it becomes possible to hold down the occurrence of the noise attributed to the sympathetic vibration of the base member 12.
Meanwhile, in the first embodiment, there is no restriction on the positions at which the welding spots 23 are formed on the mounting surface 18 in a radial direction. That is, as long as the welding spots 23 (the slits 21) are formed in between the outer peripheral border 18a of the base member 12 and the opening rim 19a of the opening 19, it serves the purpose. Moreover, in the first embodiment, there is no restriction on the number of welding spots 23. Thus, there can be two welding spots 23 or there can be four or more welding spots 23.
Furthermore, in the first embodiment, the welding spots 23 (the slits 21) are formed at the positions overlapping with the legs 22 in a radial direction. However, there is no restriction on the positions of the welding spots 23. Thus, the welding spots 23 can alternatively be formed at positions not overlapping with the legs 22 in a radial direction.
When the base member 12 is viewed from below, each welding spot 23 makes contact with at least some part of the rim portion of the corresponding slit 21, More particularly, each welding spot 23 is formed in such a way that the rim portion of the corresponding slit 21 on the mounting surface 18 of the base member 12 is linked to that portion of the bottom shell 10c which overlaps with the concerned slit 21 when viewed in the axial direction. Thus, as a result of forming the welding spots 23 via the slits 21, the bottom shell 10c is joined to the mounting surface 18 of the base member 12. In the first embodiment, the welding spots 23 are formed to make contact with the rim portion on the outer periphery side of the slits 21 on the mounting surface 18. Meanwhile, when the welding spots 23 are formed via the slits 21, as long as the welding spots 23 make contact with at least either the rim portion on the inner periphery side or the rim portion on the outer periphery side of the slits 21 on the mounting surface 18, it serves the purpose. For example, the welding spots 23 can be formed to make contact with the rim portion only on the inner periphery side of the slits 21 on the mounting surface 18. Alternatively, as explained later in a third embodiment, the welding spots 23 can be formed to make contact with the rim portion on the inner periphery side as well the rim portion on the outer periphery side of the slits 21 on the mounting surface 18.
Each welding spot 23 is formed to extend for a predetermined length in the circumferential direction of the opening 19. Herein, the length of the arc joining both ends of each welding spot 23 along the circumferential direction of the opening 19 is set to be equal to the welding length 12 of the welding spots 23. Moreover, assume that C1 represents the circumferential length of the circle (the circumference A) passing through the slits 21 in a radial direction of the mounting surface 18. In the first embodiment, the arcs representing the welding length 12 are positioned to concyclically overlap with the circumference A. At that time, it is desirable that the welding length 12 of the welding spots 23 has the ratio to be equal to or greater than 5 [%] with respect to the circumferential length C1 of the circumference A running along the circumferential direction of the opening 19 (i.e., it is desirable that 12/C1≥0.05 holds true). With that, the welding spots 23 are formed to have the welding length L2 that is sufficient for preventing wobbling in the circumferential direction. That makes it possible to appropriately secure the joint strength between the bottom shell 10c and the mounting surface 18.
In the first embodiment, as an example, in each welding spot 23, the center of a welding width W2 is positioned on the circumference A that is present at a radius r [mm] from the center of the opening 19. At that time, the circumferential length C1 of the circumference A is equal to C1=2×π×r [mm], and the ratio of the welding length 12 of the welding spots 23 with respect to the circumferential length C1 of the circumference A is set to be approximately equal to 10 [%] (i.e., L2/C1≈0.1 holds true).
Moreover, in the first embodiment, the welding spots 23 are formed in such a way that the slit length L1 of the slits 21 is greater than the welding length L2. Thus, for example, each welding spot 23 is formed not to reach both ends of the corresponding slit 21. In other words, the slit length I1 is greater than the welding length L2 (i.e., L1>L2 holds true). As a result, at the time of performing welding at the welding spots 23, the electrode of the welding torch (not illustrated) during arc welding is prevented from colliding with the rim portion at both ends of the slits 21. That enables achieving improvement in the welding activity. Meanwhile, there is no restriction on the slit length 11 of the slits 21 according to the first embodiment. Thus, the slit length 11 can be set to be equal to the welding length 12, because of which the slits 21 get entirely covered by the welding spots 23.
As explained above, the welding spots 23 are formed through the slits 21 that are present at a distance from the opening 19 of the base member 12. Thus, the welding spots 23 are formed at a distance from the opening rim 19a of the opening 19. Hence, the portion 18b of the mounting surface 18 of the base member 12 can be secured on the inner diameter side as well as the outer diameter side of each welding spot 23 in a radial direction of the mounting surface 18 (i.e., in the direction of the welding width W2). At the time of forming the welding spots 23 via the slits 21, due to the heat applied during welding, the base member 12 undergoes deformation in the form of expansion around the welding spots 23. In that regard, in the first embodiment, the mounting surface 18 is kept intact around the welding spots 23 (the slits 21), Hence, the mounting surface 18 has high stiffness around the slits 21. Moreover, in the first embodiment, since the mounting surface 18 is kept intact around the slits 21 (the welding spots 23), the stress generated on the mounting surface 18 in the vicinity of the welding spots 23 due to the heat applied during welding is offset around the slits 21. For that reason, in the base member 12, the portion in the vicinity of the opening 19 is prevented from undergoing deformation along the opening rim 19a attributed to the heat applied onto the welding spots 23 during welding. That enables holding down deformation occurring in the portions between the neighboring welding spots 23 on the mounting surface 18 due to the heat applied during welding. As a result, at the time of welding, it becomes possible to prevent gaps from occurring between a bottom face 10d of the bottom shell 10c of the compressor main body container 10 and the mounting surface 18 of the base member 12. Consequently, it becomes possible to avoid the sympathetic vibration of the base member 12 that would occur in case gaps are formed between the compressor main body container 10. That enables holding down an increase in the noise attributed to the sympathetic vibration of the base member 12 accompanying the vibration of the compressor main body container 10.
Moreover, in the first embodiment, the bottom shell 10c makes contact with the rim portion of the opening 19 of the base member 12. Thus, the rim portion of the opening 19 of the base member 12 is pressed by the bottom shell 10c, which results in an increase in the strength around the rim portion of the opening 19 of the base member 12. Hence, it becomes possible to hold down deformation in the base member 12 attributed to the heat applied during welding. Moreover, because of the contact made by the bottom shell 10c with the rim portion of the opening 19 of the base member 12, it becomes possible to prevent the formation of a gap between the bottom shell 10c and the rim portion of the opening 19 of the base member 12. That enables avoiding vibration of the base member 12 that would occur in case gaps are formed in between the compressor main body container 10.
Furthermore, in the first embodiment, the welding spots 23 are formed to be raised above the rim portion on the outer periphery side of the slits 21, which are formed on the mounting surface 18, by about 1 [mm]. Thus, the welding spots 23 are formed to ensure that the rim portion of the slits 21 on the base member 12 are reliably linked to the bottom shell 10c. That results in an increased joint strength based on the welding, and enables holding down deformation of the base member 12 due to the heat applied during welding. Hence, it becomes possible to prevent the formation of gaps between the rim portion of the slits 21 of the base member 12 and the bottom shell 10c. That enables avoiding vibration of the base member 12 that would occur in case gaps are formed in between the compressor main body container 10.
Meanwhile, in the first embodiment, the welding spots 23 are formed to extend in an arc-like manner along the rim portion of the outer periphery side of the slits 21. Alternatively, for example, the welding spots 23 can be formed to extend in a linear manner while making contact with the rim portion of the slits 21.
In the first embodiment, the explanation is given about the case in which the welding spots 23 are formed by performing arc welding via the slits 21. However, the formation of the welding spots 23 is not limited to arc welding, Alternatively, the welding spots 23 can be formed according to a welding method that does not involve the slits 21. For example, the welding spots 23 can be formed by performing laser welding or projection welding, In the case of implementing a welding method that does not involve the slits 21, there is no need to form the slits 21 on the mounting surface 18 of the base member 12. Thus, as long as a plurality of welding spots 23 is formed in between the outer peripheral border 18a of the base member 12 and the opening rim 19a of the opening 19, it serves the purpose.
As illustrated in
As illustrated in
On the other hand, in the comparison example, upon comparing the deformation before and after the welding of the bottom shell 10c and the base member 12 (i.e., before and after the formation of the welding spots 23), that portion of the mounting surface 18 which is positioned on the circumference A present at the distance r [mm] from the center of the opening 19 is deformed in the direction of the central axis by an amount of deformation equal to or greater than thrice at a maximum as compared to the first embodiment. Moreover, in the comparison example, on the mounting surface 18 on the circumference A, there are sections that are significantly deformed in the direction of the rotation axis and there are sections having almost no deformation in the direction of the rotation axis. As a result, on comparison of the state before and after the welding, the mounting surface 18 of the base member 12 exhibits undulation. For that reason, if the welding spots 23 are formed along the opening 19 as explained in the comparison example, gaps can get easily formed between the bottom shell 10c and the mounting surface 18 of the base member 12.
In contrast to the comparison example, according to the first embodiment, when the welding spots 23 are formed in between the opening rim 19a of the opening 19 and the outer peripheral border of the mounting surface 18, it becomes possible to prevent any gaps from forming between the bottom shell 10c of the compressor main body container 10 and the mounting surface 18 of the base member 12 due to welding-induced deformation at the time of welding. Hence, in the first embodiment, it becomes possible to hold down the occurrence of vibration of the base member 12 attributed to the formation of gaps between the compressor main body container 10 and the base member 12.
In the following explanation, regarding the comparison between the first embodiment and the comparison example, the reason behind the occurrence of a significant difference in the amount of deformation before and after the welding as illustrated in
In the comparison example, since the welding spots 23 are formed along the opening 19, that portion of the base member 12 which is in the vicinity of the opening rim 19a of the opening 19 expands away from a particular welding spot 23 (for example, from a first welding spot 231) in the circumferential direction of the opening 19. Moreover, around a different welding spot 23 (for example, a second welding spot 232) too, that portion of the base member 12 which is in the vicinity of the opening rim 19a of the opening 19 expands away from the welding spot 23 (the second welding spot 232) in the circumferential direction of the opening 19. As a result, the base member 12 experiences a force from both welding spots 23 (the first welding spot 231 and the second welding spot 232), which are adjacent in the circumferential direction, in the direction of getting compressed toward an intermediate position between those two welding spots 23. Hence, the base member 12 creases at the intermediate position between the two welding spots 23, and it results in sagging of the mounting surface 18.
In contrast, in the first embodiment, as explained earlier, the mounting surface 18 is kept intact around the welding spots 23 (the slits 21). Hence, the mounting surface 18 has high stiffness around the slits 21. Moreover, in the first embodiment, since the mounting surface 18 is kept intact around the slits 21 (the welding spots 23), the stress generated on the mounting surface 18 in the vicinity of the welding spots 23 due to the heat applied during welding is offset around the slits 21. For that reason, in the base member 12 according to the first embodiment, it is estimated that the deformation in the form of sagging of the portions present between the neighboring welding spots 23 on the mounting surface 18 due to the heat applied during welding is held down.
A transfer function illustrated in
As illustrated in
Thus, as compared to the comparison example in which the welding spots 23 are formed along the opening rim 19a of the opening 19, in the first embodiment in which the welding spots 23 are formed in between the outer peripheral border 18a of the mounting surface 18 and the opening rim 19a of the opening 19, deformation occurring around the welding spots 23 due to the heat applied during welding can be held down, and the base member 12 and the bottom shell 10c in a contact state can be joined without any gaps therebetween. As a result, it can be said that the noise attributed to the sympathetic vibration of the base member 12 can be reduced. As an example, in the first embodiment, the noise attributed to the sympathetic vibration of the base member 12 in the vicinity of 2500 [Hz] is reduced to a greater extent as compared to the comparison example.
As explained above, in the rotary compressor 1 according to the first embodiment, in the center of the mounting surface 18 of the base member 12, the opening 19 is formed into which the central part of the bottom shell 10c is fit. The base member 12 is joined to the compressor main body container 10 using a plurality of welding spots 23 formed after every interval S1 in the circumferential direction of the opening 19. The welding spots 23 are formed to extend for a predetermined length in the circumferential direction of the opening 19, and are positioned in between the outer peripheral border 18a of the mounting surface 18 and the opening rim 19a of the opening 19. As a result, portions of the mounting surface 18 are secured on both sides of the welding spots 23 in a radial direction of the mounting surface 18. Hence, the deformation occurring in the base member 12 due to the heat applied during welding is held down using the stiffness of the base member 12 itself. Particularly, in the first embodiment, the mounting surface 18 is kept intact around the welding spots 23 (the slits 21), so that the stress generated on the mounting surface 18 in the vicinity of the welding spots 23 due to the heat applied during welding is offset around the slits 21. That enables holding down the deformation of the mounting surface 18. For that reason, that portion of the base member 12 which is positioned on the inner periphery side of the slits 21 on the mounting surface 18 can be joined with the bottom shell 10c in a contact state and without any gaps therebetween. As a result, the sympathetic vibration of the base member 12 accompanying the vibration of the compressor main body container 10 can be held down, and the occurrence of the noise attributed to the sympathetic vibration of the base member 12 can be held down.
Moreover, in the rotary compressor 1 according to the first embodiment, the mounting surface 18 of the base member 12 is formed along the bottom shell 10c of the compressor main body container 10, and makes contact with the contact face 10cal of the bottom shell 10c. As a result, it becomes possible to prevent the formation of gaps between the bottom shell 10c, which is placed on the mounting surface 18, and the mounting surface 18; and the vibration occurring in the base member 12 can be held down. Moreover, in the first embodiment, the opening rim 19a of the opening 19 of the base member 12 makes contact with the bottom shell 10c. As a result, the opening rim 19a of the opening 19 of the base member 12 is pressed by the bottom shell 10c, which results in an increase in the mechanical strength around the rim portion of the opening 19 of the base member 12. Hence, it becomes possible to hold down deformation in the base member 12 attributed to the heat applied during welding. Moreover, it becomes possible to prevent the formation of gaps between the bottom shell 10c and the rim portion of the opening 19 of the base member 12. That enables avoiding vibration attributed to the sympathetic vibration of the base member 12.
Furthermore, in the base member 12 of the rotary compressor 1 according to the first embodiment, when the welding width W2 of each welding spot 23 is set as the width of the welding spot 23 in the direction orthogonal to the direction of the welding length 12 (the circumferential direction) (i.e., in a radial direction), and when the circumference A is set as the circumference passing through the center of the welding width W2 and running along the circumferential direction of the opening 19; the welding length 12 of each welding spot 23 represents the ratio equal to or greater than 5 [%] with respect to the circumferential length C1 of the circumference A. That makes it possible to appropriately secure the joint strength attributed to the welding spots 23.
Moreover, in the base member 12 of the rotary compressor 1 according to the first embodiment, a plurality of welding spots 23 is formed along the same circumference passing through the portion between the outer peripheral border 18a of the mounting surface 18 and the opening rim 19a of the opening 19 (i.e., formed along the circumference A). As a result, the portions 18b of the mounting surface 18 are secured on both sides of the welding spots 23 in a radial direction of the mounting surface 18. Hence, the deformation occurring in the base member 12 due to the heat applied during welding is held down using the stiffness of the base member 12 itself. For that reason, the base member 12 and the bottom shell 10c can be joined without any gaps therebetween. As a result, the sympathetic vibration of the base member 12 can be held down in an effective manner, and the occurrence of the noise attributed to the sympathetic vibration of the base member 12 can be held down in an effective manner.
Furthermore, in the base member 12 of the rotary compressor 1 according to the first embodiment, a plurality of slits 21 extending in the circumferential direction of the opening 19 is formed through the mounting surface 18 at intervals on the circumference A that runs along the circumferential direction of the opening 19. Then, the welding spots 23 are formed via the slits 21 and make contact with the rim portion of the slits 21. With that, it becomes possible to enhance the joint strength attributed to the welding spots 23.
Moreover, in the base member 12 of the rotary compressor 1 according to the first embodiment, the slit width W1 of each slit 21 in the direction orthogonal to the circumferential direction of the opening 19 (i.e., in a radial direction of the opening 19) is equal to or greater than 1.5 times the thickness T of the mounting surface 18 of the base member 12 (i.e., W1≤1.5×T holds true). As a result, when the electrode of a welding torch (not illustrated) is moved closer to the contact portions between the bottom shell 10c and the mounting surface 18 of the base member 12 via the slits 21, the electrode of the welding torch can be prevented from colliding with the rim portion of the slits 21. That makes the manufacturing easier.
Furthermore, in the base member 12 of the rotary compressor 1 according to the first embodiment, the slit length L1 in the circumferential direction of the opening 19 is greater than the welding length L2 for which each welding spot 23 extends in the circumferential direction of the opening 19 (i.e., L1>L2 holds true). As a result, when the electrode of a welding torch (not illustrated) is moved closer, it becomes possible to prevent collision of the electrode of the welding torch with the rim portion of the slits 21. For that reason, the welding spots 23 can be appropriately formed to ensure that the mounting surface 18 of the base member 12 is linked to the bottom shell 10c. Hence, the base member 12 and the bottom shell 10c can be joined while maintaining the state of mutual contact, and the joint strength attributed to the welding spots 23 can be enhanced.
Moreover, in the base member 12 of the rotary compressor 1 according to the first embodiment, each welding spot 23 is formed to make contact with at least either the rim portion on the inner periphery side or the rim portion on the outer periphery side of the corresponding slit 21. As a result, the base member 12 and the bottom shell 10c can be joined in the state of mutual contact and without any gaps therebetween, and the joint strength attributed to the welding spots 23 can be enhanced.
Given below is the description of other embodiments with reference to the accompanying drawings. In the other embodiments, the identical portions and the identical constituent elements to the first embodiment are referred to by the same reference numerals.
In the second embodiment, the slits 21 formed on the base member 12 have, what is called, a semicircular cross-sectional surface (hog-backed shape) that includes an arc-like rim portion on the outer periphery side and a linear rim portion on the inner periphery side. The arc on the outer periphery side of the slits 21 has, for example, a smaller curvature than the curvature of the circumference A running along the circumferential direction of the opening 19. The straight line running along the rim portion on the inner periphery side of the slits 21 is parallel to a straight line tangent to the circumference A.
As illustrated in
In the second embodiment too, in an identical manner to the first embodiment, the welding spots 23 are positioned in between the outer peripheral border 18a of the mounting surface 18 and the opening rim 19a of the opening 19. Hence, at the time of welding, it becomes possible to hold down the deformation of the portions present between the neighboring welding spots 23 in the circumferential direction of the opening 19, For that reason, at the time of welding, it becomes possible to prevent the formation of gaps between the bottom face 10d of the bottom shell 10c and the mounting surface 18 of the base member 12, thereby enabling holding down the sympathetic vibration of the base member 12 accompanying the vibration of the compressor main body container 10.
As illustrated in
In the second and third embodiments too, in an identical manner to the first embodiment, a plurality of welding spots 23 is formed to extend for a predetermined welding length 12 in the circumferential direction of the opening 19, and is positioned in between the outer peripheral border 18a of the mounting surface 18 and the opening rim 19a of the opening 19. Hence, at the time of welding, it becomes possible to hold down the deformation in the portions present between the neighboring welding spots 23 in the circumferential direction of the opening 19. As a result, the sympathetic vibration of the base member 12 accompanying the vibration of the compressor main body container 10 can be held down, and the noise attributed to the sympathetic vibration of the base member 12 can be held down.
As illustrated in
Moreover, in the base member 12 according to the fourth embodiment, for example, the welding spots 23 can be formed according to a plurality of projection welding instances. Hence, instead of forming the slits 21, for example, a plurality of salient portions (not illustrated) meant for enabling the formation of the welding spots 23 can be formed at the positions of the welding spots 23 and on the side on which the bottom shell 10c of the mounting surface 18 comes into contact. Thus, in the case of forming the welding spots 23 according to projection welding, a plurality of salient portions (not illustrated) meant for enabling the formation of the welding spots 23 can be formed on the bottom face 10d of the bottom shell 10c of the compressor main body container 10.
Meanwhile, in the first to fourth embodiments, although the explanation is given about an example in which three welding spots 23 are formed; the number of welding spots 23 is not limited to three, and four or more welding spots 23 can also be formed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022-049121 | Mar 2022 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2023/006876 | 2/24/2023 | WO |
