JP5790090B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor including a casing that houses a motor.

  Conventionally, a compressor is configured by housing a compression mechanism and a motor that drives the compression mechanism in a casing. In the compressors of Patent Documents 1 and 2, a terminal connected to the motor and a protective cover arranged around the terminal are attached to one plane formed on the outer peripheral surface of the casing by welding or the like. .

Japanese Utility Model Publication No. 60-55261 JP 2004-92556 A

  In the compressor as described above, if the welded portion of the terminal is distorted, metal fatigue may occur in the welded portion due to repeated changes in the internal pressure of the casing. As a result, there arises a problem that the sealing performance of the casing is lowered. In Cited Document 2, the terminal welding method is devised so that distortion does not occur in the welded part during terminal welding.

  In recent years, a compressor using a CO 2 refrigerant that has little influence on global warming has been developed. In such a compressor, the inside of a casing becomes very high pressure. Therefore, in order to increase the strength of the casing, it is necessary to make the flat portion of the casing as small as possible. On the other hand, in the compressor as described above, it is necessary to provide a plane for attaching the terminal and the protective cover. Here, for example, in a compressor such as Patent Documents 1 and 2, consider the case where a terminal is first attached by resistance welding and then a protective cover is attached by projection welding which is a type of resistance welding. In such a case, if the area of the plane on which the terminal and the protective cover are attached is reduced, the distance between the welded portion of the terminal and the welded portion of the protective cover becomes closer than in the past. In addition, since the terminal and the protective cover are attached to the same plane, the plane is distorted by the applied pressure when the protective cover is welded using the welding electrode, and the welded portion of the previously welded terminal is also distorted. Problems arise. Conversely, even if the protective cover is first attached to the protective cover, it is conceivable that the plane is distorted due to the applied pressure when the protective cover is welded, and the terminal is to be welded. In such a case, there is a possibility that the terminal cannot be securely attached.

  Then, this invention is made | formed in order to solve the above subjects, and it aims at providing the reliable compressor which can suppress the distortion which arises in the welding part of a casing and a terminal.

A compressor according to a first aspect of the present invention is a compressor including a casing that houses a motor, and a terminal connected to the motor is a resistor in a first plane provided on a curved outer peripheral surface of the casing. A protective cover joined by welding and disposed around the terminal is joined by resistance welding on a second plane provided on the curved outer peripheral surface of the casing, and the first plane and the second plane Are separated from each other.

  Note that “the first plane and the second plane are spaced apart” means that the first virtual plane including the first plane and the second virtual plane including the second plane are between the first plane and the second plane. It means that a surface (curved surface or flat surface) that is not included in any virtual plane is provided.

  In this compressor, the first plane for welding the terminal and the second plane for welding the protective cover are separated from each other, and the distortion caused by the applied pressure during welding of the protective cover is between the first plane and the second plane. Since it is transmitted to the welded portion (first plane) of the terminal through the provided surface, distortion generated in the welded portion of the terminal can be suppressed. Therefore, even if the area of the plane for attaching the terminal and the protective cover is reduced, distortion of the welded portion between the casing and the terminal can be suppressed.

  The compressor which concerns on 2nd invention is a compressor which concerns on 1st invention, The outer peripheral surface of the said casing has several said 2nd planes mutually spaced apart.

  In this compressor, when the protective cover is welded at a plurality of positions, the area of the plane can be reduced as compared with welding on one second plane. Accordingly, it is possible to prevent the strength of the casing from being lowered.

  A compressor according to a third aspect is the compressor according to the second aspect, wherein at least two of a plurality of virtual planes including the plurality of second planes are the same.

  In this compressor, the shape of the protective cover to be welded on each of the plurality of second planes can be simplified. Moreover, since a several 2nd plane faces the same direction, when using an electrode at the time of resistance welding, the pressurization direction in a some 2nd plane becomes the same. Therefore, the welding operation of the protective cover on the plurality of second planes can be performed at a time.

  A compressor according to a fourth aspect is the compressor according to the second aspect, wherein at least two of the plurality of virtual planes including the plurality of second planes are parallel to each other.

  In this compressor, since the plurality of second planes face the same direction, when the electrodes are used during resistance welding, the pressurizing directions in the plurality of second planes are the same. Therefore, the welding operation of the protective cover on the plurality of second planes can be performed at a time.

  A compressor according to a fifth aspect is the compressor according to any one of the first to third aspects, wherein a virtual plane including the first plane and a virtual plane including the second plane are the same.

  In this compressor, the shape of the protective cover can be simplified. In addition, the terminal and the protective cover can be easily positioned.

  A compressor according to a sixth aspect of the present invention is the compressor according to any one of the first to fifth aspects, wherein the second flat surface is provided inside a region facing the protective cover on the casing surface. .

  In this compressor, the second plane has no portion protruding from the region facing the protective cover, that is, a useless portion not related to welding. Therefore, the second plane can be made small, and the strength reduction of the casing can be prevented.

  A compressor according to a seventh aspect is the compressor according to any one of the first to sixth aspects, wherein the protective cover is resistance-welded at a plurality of locations on one second plane.

  In this compressor, the protective cover can be reliably joined to the casing by welding at a plurality of locations on one second plane.

  A compressor according to an eighth invention is the compressor according to any one of the first to seventh inventions, wherein the protective cover is formed with a hole capable of suspending the compressor, It is provided near the welding position of the protective cover from the welding position of the terminal.

  In this compressor, since the distance between the hole where the compressor can be suspended and the welding position of the protective cover can be made relatively short, when the compressor is suspended during manufacture or transportation, Is difficult to peel off. Therefore, the welding strength of the protective cover can be reduced as compared with the case where the hole is provided on the terminal welding position side. Therefore, the applied pressure at the time of welding the protective cover can be reduced, and the distortion caused by the applied pressure can be reduced.

  A compressor according to a ninth aspect is the compressor according to any one of the first to eighth aspects, wherein the protective cover covers the entire circumference around the terminal.

  In this compressor, the terminal can be reliably protected by the protective cover that covers the entire circumference of the terminal while suppressing distortion generated in the first plane to which the terminal is welded.

  A compressor according to a tenth aspect of the invention is the compressor according to any one of the first to ninth aspects, wherein the first plane and the second plane are provided in a portion that defines a high-pressure space in the casing. It has been.

  In this compressor, it is effective to apply the present invention that can reduce the strength of the casing by reducing the first plane and the second plane.

  A compressor according to an eleventh aspect of the invention is the compressor according to any one of the first to tenth aspects of the invention, and uses a CO2 refrigerant as the refrigerant.

  In this compressor, when a CO2 refrigerant is used, it is necessary to reduce the plane area of the casing so that it can withstand high pressure. Therefore, it is effective to apply the present invention.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, the first plane for welding the terminal and the second plane for welding the protective cover are separated from each other, and the pressure applied when the protective cover is welded is provided between the first plane and the second plane. Since it is transmitted to the welded portion (first plane) of the terminal through the formed surface, distortion generated in the welded portion of the terminal can be suppressed. Therefore, even if the area of the plane for attaching the terminal and the protective cover is reduced, distortion of the welded portion between the casing and the terminal can be suppressed.

  In 2nd invention, when welding a protective cover in multiple places, the area of a plane can be made small rather than welding on one 2nd plane. Accordingly, it is possible to prevent the strength of the casing from being lowered.

  In 3rd invention, the shape of the protective cover welded in each of several 2nd plane can be simplified. Moreover, since a several 2nd plane faces the same direction, when using an electrode at the time of resistance welding, the pressurization direction in a some 2nd plane becomes the same. Therefore, the welding operation of the protective cover on the plurality of second planes can be performed at a time.

  In 4th invention, since several 2nd planes face the same direction, when using an electrode at the time of resistance welding, the pressurization direction in several 2nd planes becomes the same. Therefore, the welding operation of the protective cover on the plurality of second planes can be performed at a time.

  In the fifth invention, the shape of the protective cover can be simplified. In addition, the terminal and the protective cover can be easily positioned.

  In the sixth aspect of the invention, the second plane has no portion protruding from the region facing the protective cover, that is, a useless portion not related to welding. Therefore, the second plane can be made small, and the strength reduction of the casing can be prevented.

  In 7th invention, a protective cover can be reliably joined to a casing by welding in multiple places in one 2nd plane.

  In the eighth invention, since the distance between the hole through which the compressor can be suspended and the welding position of the protective cover can be made relatively short, when the compressor is suspended during the manufacture of the compressor or the transportation of the compressor, Welding is difficult to peel off. Therefore, the welding strength of the protective cover can be reduced as compared with the case where the hole is provided on the terminal welding position side. Therefore, the applied pressure at the time of welding the protective cover can be reduced, and the distortion caused by the applied pressure can be reduced.

  In 9th invention, a terminal can be reliably protected by the protective cover which covers the perimeter of a terminal, suppressing the distortion produced in the 1st plane where a terminal is welded.

  In the tenth invention, it is effective to apply the present invention which can reduce the strength of the casing by reducing the first plane and the second plane.

  In the eleventh aspect, when the CO2 refrigerant is used, it is effective to apply the present invention because the plane area of the casing needs to be reduced so as to withstand high pressure.

1 is a schematic cross-sectional view of a compressor according to a first embodiment of the present invention. It is a top view of the compressor of FIG. FIG. 2 is a top view of the compressor in FIG. 1, in which a protective cover is not shown. It is a fragmentary sectional view which follows the AA line of the airtight casing of FIG. It is a figure explaining the welding method of the terminal of FIG. It is a figure which shows the state before welding of the protective cover of FIG. 1, (a) is a top view, (b) is a X view arrow view of (a), (c) is a Y view arrow view of (a). It is. It is a side view of the compressor concerning a 2nd embodiment of the present invention. It is a top view of the compressor of FIG. (A) is sectional drawing along the BB line of FIG. 8, (b) is sectional drawing along the BC line of FIG. It is a figure which shows the protective cover shown in FIG. 7, (a) is a top view, (b) is an X view arrow view of (a), (c) is sectional drawing along the DD line of (a). It is. It is a schematic sectional drawing of the compressor which concerns on 3rd Embodiment of this invention. FIG. 12 is a side view of the vicinity of the welded portion of the protective cover in the main body of the hermetic casing of FIG. 11A is a cross-sectional view taken along line EE in FIG. 11, FIG. 11B is a cross-sectional view taken along line FF in FIG. 11, and FIG. 11C is a cross-sectional view taken along line GG in FIG. It is. It is sectional drawing of the upper part of the airtight casing in the compressor concerning the modification of 2nd Embodiment.

<First Embodiment>
The first embodiment of the present invention will be described below.
This embodiment is an example in which the present invention is applied to a rotary compressor.
As shown in FIG. 1, the compressor 1 of this embodiment includes a sealed casing 9, a compression mechanism 10 and a drive mechanism 6 disposed in the sealed casing 9. In FIG. 1, hatching indicating a cross section of the drive mechanism 6 is omitted. The compressor 1 is a so-called high-pressure dome type compressor, and is used by being incorporated in a refrigeration cycle such as an air conditioner, for example, and compresses a refrigerant (CO2 in this embodiment) introduced from the suction pipe 2. And discharged from the discharge pipe 3. The compressor 1 will be described below with the vertical direction in FIG.

  The hermetic casing 9 is a cylindrical container with both ends closed, a cylindrical main body 91 having both ends open, an upper lid 92 that closes the upper end opening of the main body 91, and a lower end that closes the lower end opening. It is comprised with the cover body 93. FIG. Both the upper lid body 92 and the lower lid body 93 are curved so as to bulge outward as a whole. The upper lid 92 is provided with a discharge pipe 3, a terminal 4 for supplying a current to a coil of a stator 7 b described later of the drive mechanism 6, and a protective cover 5 for protecting the terminal 4. As shown in FIG. 2, the protective cover 5 has a protective wall 5 b that covers the entire circumference around the terminal 4. As will be described in detail later, the terminal 4 and the protective cover 5 are joined to the hermetic casing 9 by resistance welding. In FIG. 1, the wiring connecting the coil and the terminal 4 is omitted. Also. A suction pipe 2 is provided in the main body 91 of the hermetic casing 9. Lubricating oil L for smoothing the operation of the sliding portion of the compression mechanism 10 is stored in the lower part of the hermetic casing 9. Inside the hermetic casing 9, the drive mechanism 6 and the compression mechanism 10 are arranged vertically.

  The drive mechanism 6 is provided to drive the compression mechanism 10 and includes a motor 7 serving as a drive source and a shaft 8 attached to the motor 7.

  The motor 7 includes a substantially annular stator 7b fixed to the inner peripheral surface of the hermetic casing 9, and a rotor 7a disposed on the radially inner side of the stator 7b via an air gap. . The rotor 7a has a magnet (not shown), and the stator 7b has a coil. The motor 7 rotates the rotor 7a by an electromagnetic force generated by passing a current through the coil.

  The shaft 8 is provided to transmit the driving force of the motor 7 to the compression mechanism 10, is fixed to the inner peripheral surface of the rotor 7a, and rotates integrally with the rotor 7a. The shaft 8 has an eccentric portion 8a at a position in the compression chamber 31 described later. The eccentric portion 8 a is formed in a columnar shape, and its axis is eccentric from the rotation center of the shaft 8. A piston 40 (to be described later) of the compression mechanism 10 is attached to the eccentric portion 8a.

  The compression mechanism 10 includes a front head 20 that is fixed to the inner peripheral surface of the hermetic casing 9, a muffler 11 that is disposed above the front head 20, a cylinder 30 that is disposed below the front head 20, and a cylinder 30. Is provided with a piston 40 slidably disposed in the interior thereof, and a rear head 50 disposed below the cylinder 30. Although details will be described later, the cylinder 30 is a substantially annular member, and a compression chamber 31 is formed at the center thereof. The cylinder 30 is fixed to the lower side of the front head 20 together with the rear head 50 by bolts.

  As shown in FIG. 1, each of the front head 20 and the rear head 50 is a substantially annular member, and bearing holes 21 and 51 through which the shaft 8 is rotatably inserted are respectively formed at the center thereof. Yes. The front head 20 closes the upper end of the compression chamber 31, and the rear head 50 closes the lower end of the compression chamber 31. The muffler 11 is attached to the upper surface of the front head 20 with bolts, and forms a muffler space M between which the refrigerant is discharged from the discharge hole (not shown).

  The cylinder 30 is formed with the above-described compression chamber 31 and a suction hole 32 for introducing the refrigerant into the compression chamber 31. In the compression chamber 31, a piston 40 mounted on the eccentric portion 8a is disposed so as to be swingable.

  In the compression mechanism 10, when the shaft 8 is rotated by driving the motor 7 while supplying the refrigerant from the suction pipe 2 to the compression chamber 31 through the suction hole 32, the piston 40 attached to the eccentric portion 8 a It moves along the peripheral wall surface of 31. Along with this, the volume of the space formed by the outer peripheral surface of the piston 40 and the peripheral wall surface of the compression chamber 31 is reduced. Thereby, the refrigerant is compressed in the compression chamber 31. Then, the refrigerant compressed in the compression chamber 31 is discharged into the muffler space M through a discharge hole (not shown) of the front head 20. The refrigerant discharged into the muffler space M is discharged out of the compression mechanism 10 through a muffler discharge hole (not shown) of the muffler 11. Therefore, the internal space of the sealed casing 9 is at a high pressure. The refrigerant discharged from the compression mechanism 10 passes through an air gap between the stator 7b and the rotor 7a, and is finally discharged from the discharge pipe 3 to the outside of the sealed casing 9.

Here, the joint portion of the terminal 4 of the upper lid 92 of the sealed casing 9 and the protective cover 5 will be described.
As shown in FIGS. 3 and 4, a first flat surface 95 for welding the terminal 4 and a second flat surface 96 for welding the protective cover 5 are provided on the surface of the upper lid 92. As described above, the upper lid 92 is curved so as to swell outward as a whole. That is, most of the portions other than the first plane 95 and the second plane 96 on the surface of the upper lid 92 are curved surfaces. In FIG. 2, the second plane 96 is indicated by a two-dot chain line. The terminal 4 is welded to the first plane 95 by resistance welding. The protective cover 5 is welded to the second plane 96 by projection welding, which is a type of resistance welding.

  The first plane 95 and the second plane 96 are separated from each other and are both included in the same virtual plane P1 (a plane indicated by a two-dot broken line in FIG. 4). That is, the virtual plane including the first plane 95 and the virtual plane including the second plane 96 are the same. A curved surface 97 that is not included in the virtual plane P <b> 1 is provided between the first plane 95 and the second plane 96. The curved surface 97 is a part of the curved surface that constitutes the surface of the upper lid 92 that is curved so as to bulge outward from the hollow. The first plane 95 and the second plane 96 are connected by a curved surface 97.

  The terminal 4 includes four terminal pins 4a and a substantially disc-shaped holding member 4b that holds the terminal pins 4a. The terminal pin 4a penetrates the holding member 4b. The lower end portion of the holding member 4b is an enlarged diameter portion 4c that gradually increases in diameter as it approaches the lower end. In the first plane 95, an opening 95a into which the terminal 4 is fitted is formed. More specifically, the upper end portion of the holding member 4b of the terminal 4 is fitted into the opening 95a. The terminal 4 is joined to the first plane 95 by resistance welding in a state of being fitted into the opening 95a.

  Here, the welding method of the terminal 4 is demonstrated, referring FIG. First, as described above, the upper end portion of the holding member 4b of the terminal 4 is fitted into the opening 95a formed in the first plane 95. At this time, the enlarged diameter portion 4c of the holding member 4b is positioned below the opening 95a. Then, the lower electrode 71 of the resistance welder 70 is pressed against the lower surface of the holding member 4 b, and the upper electrode 72 is pressed against the first plane 95 to energize the electrodes 71 and 72. Thereby, the contact portion between the first flat surface 95 and the holding member 4b is melted and integrated.

  As shown in FIG. 6, the protective cover 5 is composed of a flat bottom wall 5a having a substantially rectangular shape, and a protective wall 5b raised vertically from the edge of the bottom wall 5a to the bottom wall 5a. ing. An opening 5c through which the holding member 4b of the terminal 4 is inserted is formed in approximately half of the bottom wall 5a in the longitudinal direction (the upper half of FIG. 6A). Further, three welding projections 5d are formed on the half portion (the lower half portion of FIG. 6A) opposite to the side where the opening 5c is formed in the longitudinal direction of the bottom wall 5a. The welding projection 5d is for joining the protective cover 5 to the second plane 96 by projection welding. The protective wall 5b is provided all around the bottom wall 5a.

  Moreover, as shown in FIG.6 (c), the hole for hanging the compressor 1 is provided in the protective wall 5b provided in the edge part by which the welding protrusion 5d is formed in the longitudinal direction of the bottom wall 5a. 5e is formed. That is, the hole 5e is provided closer to the formation position of the welding protrusion 5d (in other words, the welding position of the protective cover 5) than the formation position of the opening 5c (in other words, the welding position of the terminal 4). Therefore, as shown by an arrow in FIG. 4, when the hole 5 e is provided near the welding position of the terminal 4, the distance between the position where the force is applied when the compressor 1 is suspended and the welding position of the protective cover 5. Can be shortened.

  A compressor protection device (not shown) such as an overload relay may be attached in the protective cover 5. Therefore, the protective walls 5b provided on both sides in the short direction of the portion where the welding projections 5d of the bottom wall 5a are formed are formed with openings 5f for fixing a stopper when the protective device is attached. Yes.

  With the terminal 4 welded to the first plane 95 inserted through the opening 5c, the protective cover 5 has three welding projections 5d opposed to the second plane 96, and a current is passed to each welding projection 5d by the projection welding electrode. By heating and pressurizing at the same time, the second plane 96 is joined. That is, the protective cover 5 is welded at three locations on the second plane 96. Since the virtual plane including the first plane 95 and the virtual plane including the second plane 96 are the same as described above, the lower surface of the flat bottom wall 5a is the first plane as shown in FIG. It abuts both the plane 95 and the second plane 96.

  As shown in FIG. 2, the second plane 96 is provided only inside the region facing the bottom wall 5 a of the protective cover 5 and does not protrude from the region facing the bottom wall 5 a. Note that the second plane 96 serves as a contact surface with the sensor surface of the protection device when the protection device is mounted in the protection cover 5 as described above. In the present embodiment, the second plane 96 is secured larger than the sensor surface of the protection device. Accordingly, the entire surface of the sensor surface can be brought into contact with the second flat surface 96 provided in the sealed casing 9, and the temperature of the sealed casing 9 can be accurately detected. In a compressor without a protective device attached, it is preferable that the second plane 96 has a minimum size that allows the protective cover 5 to be welded from the viewpoint of securing the strength of the sealed casing 9.

<Characteristics of the compressor 1 of this embodiment>
In the compressor 1 of the present embodiment, a first casing 95 that joins the terminal 4 connected to the motor 7 to the sealed casing 9 that houses the motor 7 by resistance welding, and a protective cover 5 that is disposed around the terminal 4. And a second plane 96 for joining the two by resistance welding. The first plane 95 and the second plane 96 are separated from each other.
Therefore, the first flat surface 95 for welding the terminal 4 and the second flat surface 96 for welding the protective cover 5 are separated from each other, and the distortion caused by the applied pressure when the protective cover 5 is welded is the first flat surface 95 and the second flat surface 96. Is transmitted to the welded portion (first flat surface 95) of the terminal 4 via the curved surface 97 provided between the terminal 4 and the terminal 4 can be prevented from being distorted. Therefore, even if the area of the plane for attaching the terminal 4 and the protective cover 5 is reduced, distortion of the welded portion between the sealed casing 9 and the terminal 4 can be suppressed.

  In the compressor 1 of the present embodiment, the virtual plane including the first plane 95 and the virtual plane including the second plane 96 are the same. Therefore, the shape of the protective cover 5 can be simplified. In this embodiment, since the bottom wall 5a of the protective cover 5 is formed in a flat plate shape, it can be brought into contact with both the first plane 95 and the second plane 96. At this time, the terminal 4 and the protective cover 5 can be easily positioned by inserting the terminal 4 welded to the first plane 95 into the opening 5c formed in the bottom wall 5a.

  Further, in the compressor 1 of the present embodiment, the second flat surface 96 is provided only inside the region facing the bottom wall 5a of the protective cover 5 on the surface of the closed casing 9. Therefore, the second flat surface 96 has no portion protruding from the region facing the bottom wall 5a of the protective cover 5, that is, a useless portion not related to welding. Therefore, the 2nd plane 96 can be made small and the strength reduction of the airtight casing 9 can be prevented.

  Furthermore, in the compressor 1 of the present embodiment, the protective cover 5 is projection welded at three locations on one second plane 96. Therefore, the protective cover 5 can be reliably joined to the sealed casing 9.

  In addition, in the compressor 1 of this embodiment, the suspension hole 5 e formed in the protective cover 5 is provided closer to the welding position of the protective cover 5 than the welding position of the terminals 4. Accordingly, since the distance between the suspension hole 5e and the welding position of the protective cover 5 can be made relatively short, the welding of the protective cover 5 is difficult to peel off when the compressor 1 is suspended during production or transportation. . Therefore, compared with the case where the hole 5e is provided on the welding position side of the terminal 4, the welding strength of the protective cover 5 can be reduced. As a result, the applied pressure during welding of the protective cover 5 can be reduced, and distortion caused by the applied pressure can be reduced.

  In the compressor 1 of the present embodiment, the protective wall 5 b of the protective cover 5 covers the entire periphery around the terminal 4. Therefore, the terminal 4 can be reliably protected by the protective cover 5.

  Furthermore, in the compressor 1 of the present embodiment, the closed casing 9 provided with the first plane 95 and the second plane 96 defines a space that becomes a high pressure. Therefore, it is effective to apply the present invention in which the first flat surface 95 and the second flat surface 96 are made small to prevent the strength of the sealed casing 9 from being lowered.

  Moreover, in the compressor 1 of this embodiment, the CO2 refrigerant is used as the refrigerant. In the case of using a CO2 refrigerant, it is necessary to reduce the area of the plane of the sealed casing 9 so that it can withstand high pressure. Therefore, it is effective to apply the present invention.

Second Embodiment
Next, a second embodiment of the present invention will be described.
The compressor 201 of the present embodiment is different from the first embodiment in the configuration of the protective cover 205. Since other configurations are substantially the same as those of the first embodiment, the same reference numerals are used and description thereof is omitted as appropriate.

  As shown in FIG. 7, the compressor 201 includes a sealed casing 209 that is a cylindrical container in which the drive mechanism 6 and the compression mechanism 10 are disposed, as in the compressor 1 of the first embodiment. . The hermetic casing 209 includes a main body 291, an upper lid body 292, and a lower lid body 293. A terminal 204 and a protective cover 205 are provided on the upper lid 292 of the sealed casing 209. The main body 291 of the sealed casing 209 is provided with a suction pipe 202 and a discharge pipe 203.

  As shown in FIGS. 8 and 9, the upper cover 292 of the sealed casing 209 has a substantially hemispherical shape, and a first plane 295 for welding the terminal 204 and a protective cover 205 are welded to the surface thereof. A second flat surface 296 is provided. As shown in FIG. 8, three second planes 296 are provided. In each second plane 296, two first welding legs 205b and one second welding of the protective cover 205 described later in detail. A total of three welding legs of the leg 205c are welded respectively. The first plane 295 and the three second planes 296 are separated from each other. That is, a curved surface 297 that is not included in any of the virtual plane including the first plane 295 and the virtual plane including the second plane 296 is disposed between the first plane 295 and the second plane 296. ing. As shown in FIG. 9B, a curved surface 297 between the first flat surface 295 and the second flat surface 296 to which the second welding leg 205c is welded constitutes the surface of the upper lid 292 having a substantially hemispherical shape. Part of a sphere. Of the three second planes 296, the two second planes 296 to which the first welding legs 205b are welded (that is, the two second planes 296 shown in FIG. 9A) are all the same. It is included in a virtual plane P3 (a plane indicated by a two-dot chain line in FIG. 9A). That is, the two virtual planes including the two second planes 296 are the same. The virtual plane P3 is located below the first plane 295. In the first plane 295, an opening 295a into which the terminal 204 is fitted is formed. The terminal 204 is joined to the first plane 295 by resistance welding while being inserted into the opening 295a.

  As shown in FIGS. 8 and 9, the protective cover 205 has a U shape in a top view, and has a protective wall 205 a that partially covers the periphery of the terminal 204. Two first welding legs 205b and one second welding leg 205c are provided on the lower edge of the protective wall 205a. As shown in FIG. 10A, both the first welding leg 205b and the second welding leg 205c extend outside the region surrounded by the protective wall 205a.

  The two first welding legs 205b are provided in the vicinity of both ends of the lower edge of the U-shaped protective wall 205a. As shown in FIG. 10B, the first welding leg 205b extends from the lower edge of the protective wall 205a in a direction substantially orthogonal to the protective wall 205a. The lower surfaces of the two first welding legs 205b are included in the same virtual plane P2 (a plane indicated by a two-dot chain line in FIG. 10B). The 2nd welding leg 205c is provided in the curved part in the lower edge of the U-shaped protection wall 205a. More specifically, the second welding leg 205c is provided at a position shifted from the center of the curved portion of the protective wall 205a (a position shifted to the right from the center of the curved portion in FIG. 10B). As shown in FIG.10 (c), the 2nd welding leg 205c is diagonally extended toward the downward direction rather than the direction orthogonal to the protective wall 205a from the lower edge of the protective wall 205a. The angle of the second welding leg 205c is substantially the same as that of the second plane 296 to which the second welding leg 205c is welded.

  The two first welding legs 205b and the one second welding leg 205c are respectively in contact with the three second flat surfaces 296 provided on the upper lid 292 of the sealed casing 209 as described above. More specifically, the two first welding legs 205b are in contact with two second planes 296 included in the same virtual plane P3 among the three second planes 296, and the second welding legs 205c are , Abuts against the remaining second plane 296. The protective cover 205 is joined to the second plane 296 by performing projection welding with each of the weld legs 205b and 205c in a state where the first weld leg 205b and the second weld leg 205c are in contact with the second plane 296. The

  In addition, since the upper cover body 292 is generally used for a plurality of types of compressors, it is desirable that the pressure applied during welding is not applied to the upper cover body 292 as much as possible. Therefore, if the strength of hanging the compressor can be secured, such as when the compressor is relatively light, welding with the second welding leg 205c may be omitted and welding may be performed with only the first welding leg 205b. At this time, the second welding leg 205c can also be used for positioning.

  As shown in FIG. 10B, a hole 205e for suspending the compressor 201 is formed in the protective wall 205a of the protective cover 205. The hole 205e is provided at a position shifted from the center of the curved portion of the protective wall 205a (position shifted to the left from the center of the curved portion in FIG. 10B).

<Characteristics of Compressor 201 of this Embodiment>
In the compressor 201 of the present embodiment, as in the compressor 1 of the first embodiment, the first plane 295 for welding the terminal 204 and the second plane 296 for welding the protective cover 205 are separated from each other. The distortion due to the applied pressure during 205 welding is transmitted to the welded portion (first plane 295) of the terminal 204 via the curved surface 297 provided between the first plane 295 and the second plane 296. Accordingly, the terminal 204 and the protective cover 205 can be properly attached to the sealed casing 209.

  In the compressor 201 of this embodiment, the second casing 209 is provided with three second flat surfaces 296 for welding the protective cover 205. Therefore, when the protective cover 205 is welded at a plurality of locations, the area of the plane can be made smaller than when welding at a plurality of locations on one second plane. Therefore, the strength reduction of the sealed casing 209 can be prevented.

  Furthermore, in the compressor 201 of the present embodiment, two of the three second planes 296 are included in the same virtual plane P3. Therefore, the two first welding legs 205b welded to the two second planes 296 may be formed so that their lower surfaces are included in the same virtual plane P2. Therefore, the shape of the protective cover 205 welded to each of the plurality of second planes 296 can be simplified. In addition, since the two second planes 296 that weld the two first welding legs 205b face in the same direction, when the electrodes are used during resistance welding, the pressing directions in the two second planes 296 are the same. Therefore, the welding operation of the protective cover 205 on the two second planes 296 can be performed at a time.

<Third Embodiment>
Next, a third embodiment of the present invention will be described.
This embodiment is an example in which the present invention is applied to a scroll compressor.
As shown in FIG. 11, the compressor 301 of this embodiment includes a sealed casing 309, and a compression mechanism 310 and a drive mechanism 306 that are disposed inside the sealed casing 309. In FIG. 11, hatching indicating a cross section of the drive mechanism 306 is omitted. The compression mechanism 310 is also a so-called high pressure dome type compressor. The compressor 301 will be described below with the vertical direction in FIG.

  The sealed casing 309 is a cylindrical container with both ends closed, similar to the sealed casing 9 of the first embodiment, and includes a main body 391, an upper lid body 392, and a lower lid body 393. The upper lid 392 of the hermetic casing 309 is provided with a suction pipe 302 for introducing a refrigerant. A main body 391 of the hermetic casing 309 protects the discharge pipe 303 for discharging the compressed refrigerant, a terminal 304 for supplying electricity to a coil of a stator 307b described later of the drive mechanism 306, and the terminal 304. A protective cover 305 is provided. As will be described in detail later, the terminal 304 and the protective cover 305 are joined to the hermetic casing 309 by resistance welding. In addition, a lubricating oil L for smoothing the operation of the sliding portion of the compression mechanism 310 is stored in a lower portion in the hermetic casing 309. Inside the hermetic casing 309, a compression mechanism 310 and a drive mechanism 306 are arranged vertically.

  The drive mechanism 306 includes a motor 307 serving as a drive source and a shaft 308 attached to the motor 307. The motor 307 and the shaft 308 for transmitting the driving force of the motor 307 to the compression mechanism 310 are provided.

  The motor 307 has substantially the same configuration as the motor 7 of the first embodiment, and has a substantially annular stator 307b fixed to the inner peripheral surface of the hermetic casing 309, and a radially inner side of the stator 307b. And a rotor 307a disposed through an air gap.

  The shaft 308 is provided to transmit the driving force of the motor 307 to the compression mechanism 310, is fixed to the inner peripheral surface of the stator 307b, and rotates integrally with the rotor 307a. The shaft 308 has an eccentric portion 308a at its upper end. The eccentric part 308 a is cylindrical, and its axis is eccentric from the rotation center of the shaft 308. A bearing portion 343 described later of the movable scroll 340 is attached to the eccentric portion 308a.

  The compression mechanism 310 includes a housing 320 that is fixed to the inner peripheral surface of the hermetic casing 309, a fixed scroll 330 that is disposed above the housing 320, and a movable scroll 340 that is disposed between the housing 320 and the fixed scroll 330. It has.

  The housing 320 is a substantially annular member, and an eccentric portion accommodating hole 321 and a bearing hole 322 having a diameter smaller than that of the eccentric portion accommodating hole 321 are formed in the center portion thereof. . The eccentric portion 308 a of the shaft 308 is accommodated inside the eccentric portion accommodation hole 321 in a state of being inserted inside the bearing portion 343 of the movable scroll 340. The bearing hole 322 supports the shaft 308 through a cylindrical bearing 323 so as to be relatively rotatable.

  A substantially circular recess 331 is formed at the center of the lower surface of the fixed scroll 330. Further, a spiral fixed side wrap 332 protruding downward is formed on the bottom surface of the recess 331. Further, the fixed scroll 330 is formed with a suction path 333 and a discharge hole 336 that open to the upper surface of the fixed scroll 330 and communicate with the recess 331. The suction path 333 is provided in the vicinity of the edge of the recess 331 in a top view, and the lower end of the suction pipe 302 is fitted into the upper end thereof. The discharge hole 336 is provided at the center of the recess 331 when viewed from above.

  A recess 334 is formed at a substantially central portion of the upper surface of the fixed scroll 330, and a cover member 335 is attached to the fixed scroll 330 so as to cover the recess 334. Further, the space surrounded by the recess 334 and the cover member 335 communicates with the space below the housing 320 through the communication holes 325 and 337 formed in the housing 320 and the fixed scroll 330, respectively.

  The movable scroll 340 includes a disk-shaped flat plate portion 341, a spiral movable side wrap 342 that protrudes upward from the upper surface of the flat plate portion 341, and a cylindrical bearing portion 343 that protrudes downward from the lower surface of the flat plate portion 341. It is composed of An eccentric portion 308a is inserted inside the bearing portion 343 so as to be relatively rotatable.

  The flat plate portion 341 is supported by the housing 320 via an Oldham ring 350 which is a member for preventing the movable scroll 340 from rotating. The movable-side wrap 342 of the movable scroll 340 has a substantially symmetric shape with the fixed-side wrap 332 of the fixed scroll 330 and is disposed on the flat plate portion 341 so as to mesh with the fixed-side wrap 332.

  In the compression mechanism 310, when the shaft 308 is rotated by driving the motor 307 while supplying the refrigerant from the suction pipe 302 to the recess 331 via the suction path 333, the movable scroll 340 mounted on the eccentric portion 308a rotates. Turn without any problems. Accordingly, the space formed by the side surface of the movable side wrap 342, the side surface of the fixed side wrap 332, and the peripheral wall surface of the concave portion 331 moves toward the center, and the volume thereof decreases. As a result, the refrigerant is compressed in the recess 331. The space communicates with the discharge hole 336, and the compressed refrigerant in the space is discharged from the discharge hole 336. The refrigerant discharged from the discharge hole 336 passes through the communication hole 337 of the fixed scroll 330 and the communication hole 325 of the housing 320 and is discharged into the space below the housing 320, and finally, the discharge pipe 303. To the outside of the sealed casing 309. Therefore, the internal space of the hermetic casing 309 is at a high pressure.

Here, the joint part of the terminal 304 of the main body 391 of the sealed casing 309 and the protective cover 305 will be described.
As shown in FIGS. 11 to 13, a first plane 395 for welding the terminal 304 and a second plane 396 for welding the protective cover 305 are provided on the outer peripheral surface of the main body 391 of the sealed casing 309. It has been. Similar to the first plane 95 and the second plane 96 of the first embodiment, the first plane 395 and the second plane 396 are separated from each other, and both are the same virtual plane P4 (two points in FIG. 11). The plane indicated by the chain line). A curved surface 397 that is not included in the virtual plane P4 is provided between the first plane 395 and the second plane 396. As illustrated in FIG. 13C, the curved surface 397 is a part of the surface of the cylindrical main body 391. The first plane 395 is formed with an opening 395a through which the terminal 304 is inserted. The terminal 304 is joined to the first plane 395 by resistance welding while being inserted into the opening 395a.

  As shown in FIG. 13, the protective cover 305 is formed with a bottom wall 305a in which an opening 305c into which the terminal 304 is inserted and a hole 305e for suspension are formed, as in the protective cover 5 of the first embodiment. And a protective wall 305b. The protective cover 305 is joined to the second plane 396 by projection welding in a state where the terminal 304 welded to the first plane 395 is inserted into the opening 305c.

<Characteristics of the compressor 301 of the present embodiment>
In the compressor 301 of the present embodiment, as in the compressor 1 of the first embodiment, the first plane 395 for welding the terminal 304 and the second plane 396 for welding the protective cover 305 are separated from each other. Since the distortion due to the applied pressure during 305 welding is transmitted to the welded portion (first plane 395) of the terminal 304 via the curved surface 397 provided between the first plane 395 and the second plane 396, the welding of the terminal 304 is performed. Therefore, the terminal 304 and the protective cover 305 can be properly attached to the sealed casing 309.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the second embodiment described above, as shown in FIGS. 9 and 10, the lower surfaces of the two first welding legs 205b provided on the protective cover 205 are included in the same virtual plane P2, Although the case where the two second planes 296 that weld one welding leg 205b are both included in the same virtual plane P3 has been described, the present invention is not limited to this. As shown in FIG. 14, in the modification of 2nd Embodiment, the height level of the lower surface of the two 1st welding legs 405b of the protective cover 405 differs. That is, the virtual planes P4 and P5 including the two first welding legs 405b are parallel to each other. The two second planes 496 for welding the two first welding legs 405b are also included in virtual planes P4 and P5 that are parallel to each other. The first plane 495 to which the terminal 404 is welded is located above the virtual planes P4 and P5.

  Also in the above-described modification, as in the second embodiment, when the electrodes are used during resistance welding, the pressing directions in the two second planes 496 are the same, and thus the protective covers in the two second planes 496 are used. 405 welding operations can be performed at once.

  Further, the three virtual planes including the second plane 296 that welds all the welding legs 205b and 205c provided on the protective cover 205 may be the same, or the three virtual planes may be parallel to each other. Good. Furthermore, none of the three virtual planes may be parallel.

  In addition, in the first and third embodiments described above, a virtual plane including the first plane 95 (395) for welding the terminal 4 (304) and a second plane 96 (396 for welding the protective cover 5 (305)). However, the present invention is not limited to this. For example, these virtual planes may be parallel, or may be planes that are not parallel but face different directions.

  Furthermore, in the first and third embodiments described above, the case where the second flat surface 96 (395) is provided inside the region facing the protective cover 5 (305) on the surface of the sealed casing 9 (309) will be described. However, the second plane 96 (395) may protrude from the region facing the protective cover 5 (305).

  In addition, in the first and third embodiments described above, the case where the protective cover 5 (305) is projection welded at three locations on one second plane 96 (396) has been described. It is not limited to. That is, the number of welding locations may be one or two. Moreover, you may weld in four or more places.

  Furthermore, in the first and third embodiments described above, the suspension hole 5e (305e) formed in the protective cover 5 (305) is formed on the protective cover 5 (305) from the welding position of the terminal 4 (304). Although the case where it is provided near the welding position has been described, the present invention is not limited to this. The hole 5e (305e) may be provided closer to the welding position of the terminal 4 (304) than the welding position of the protective cover 5 (305).

  In the first to third embodiments described above, the sealed casing 9 (209, 309) provided with the first flat surface 95 (295, 395) and the second flat surface 96 (296, 396) has a high pressure space. Although the case where it demarcates was demonstrated, the airtight casing 9 (209,309) may demarcate the space used as a low voltage | pressure.

  In the first to third embodiments described above, the case where the CO2 refrigerant is used as the refrigerant has been described. However, the present invention is not limited to this, and can be applied to a compressor that uses a refrigerant other than the CO2 refrigerant. .

  If this invention is utilized, the distortion which arises in the welding part of a casing and a terminal can be suppressed and reliability can be improved.

1, 201, 301 Compressor 5, 205, 305, 405 Protective cover 5e, 205e, 305e Hole 7, 307 Motor 9, 209, 309 Sealed casing 4, 204, 304, 404 Terminal 95, 295, 395, 495 First Plane 96, 296, 396, 496 Second plane

Claims (11)

A compressor having a casing for accommodating a motor,
The terminal connected to the motor is joined by resistance welding on the first plane provided on the curved outer peripheral surface of the casing,
A protective cover disposed around the terminal is joined by resistance welding on a second plane provided on the curved outer peripheral surface of the casing,
The compressor characterized in that the first plane and the second plane are separated from each other.   2. The compressor according to claim 1, wherein an outer peripheral surface of the casing has a plurality of the second flat surfaces spaced apart from each other.   The compressor according to claim 2, wherein at least two of the plurality of virtual planes including the plurality of second planes are the same.   The compressor according to claim 2, wherein at least two of the plurality of virtual planes each including the plurality of second planes are parallel to each other.   The compressor according to any one of claims 1 to 3, wherein a virtual plane including the first plane and a virtual plane including the second plane are the same.   The compressor according to any one of claims 1 to 5, wherein the second flat surface is provided inside a region facing the protective cover on the casing surface.   The compressor according to any one of claims 1 to 6, wherein the protective cover is resistance-welded at a plurality of locations on one second plane. The protective cover is formed with a hole capable of hanging the compressor,
The compressor according to claim 1, wherein the hole is provided closer to a welding position of the protective cover than a welding position of the terminal.   The compressor according to any one of claims 1 to 8, wherein the protective cover covers the entire periphery of the terminal.   The compressor according to any one of claims 1 to 9, wherein the first plane and the second plane are provided in a portion that defines a high-pressure space in the casing.   The compressor according to any one of claims 1 to 10, wherein a CO2 refrigerant is used as the refrigerant.

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