JP2007309146A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor for reducing variation in volume efficiency. <P>SOLUTION: The compressors 1 and 101 have crankshafts 17 and 117, rotors 21a and 121, cylinder blocks 24 and 124, and heads 23 and 25. The crankshafts have eccentric shaft parts 17a and 117a. The rotors are fitted to the eccentric shaft parts. The cylinder blocks have cylinder holes 24a and 124a and thermal insulation spaces 24f and 124f. The cylinder holes store the eccentric shaft parts and the rotors. The thermal insulation spaces are formed on the outer periphery of the cylinder holes. The heads cover the cylinder holes and the thermal insulation spaces. These heads are welded by a laser to the cylinder blocks in a position corresponding to a part between the cylinder holes and the thermal insulation spaces. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a compressor, and more particularly to a compressor that can reduce variation in volumetric efficiency between products.

In the past, in swing compressors and rotary compressors, the volumetric efficiency of the compressor has been improved by reducing the amount of heat that leaks from the refrigerant gas compressed in the cylinder chamber to the low-temperature intake gas through the cylinder block. For this purpose, it has been proposed to form a heat insulating space on the outer peripheral side of the cylinder chamber (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-99183

  However, when the heat insulating space is formed on the outer peripheral side of the cylinder chamber in this way, there may be some variation in volume efficiency between products depending on the degree of sealing between the head and the cylinder block.

  An object of the present invention is to provide a compressor with less variation in volumetric efficiency.

  A compressor according to a first invention includes a crankshaft, a rotor, a cylinder block, and a head. Here, the “rotor” includes a rotor portion of a piston of a swing compressor, a rotor of a rotary compressor, and the like. The crankshaft has an eccentric shaft portion. The rotor is fitted to the eccentric shaft portion. The cylinder block has a cylinder hole and a heat insulating space. The cylinder hole accommodates the eccentric shaft portion and the rotor. The heat insulating space is formed on the outer periphery of the cylinder hole. The head covers the cylinder hole and the heat insulating space. The head is laser welded to the cylinder block at a position corresponding to the space between the cylinder hole and the heat insulating space.

  In this compressor, the head is laser welded to the cylinder block at a position corresponding to the space between the cylinder hole and the heat insulating space. For this reason, in this compressor, the space between the cylinder hole and the heat insulating space is almost completely sealed. In addition, since it can be made boltless by laser welding, the cylinder can be made smaller and the heat transfer area can be reduced. Therefore, this compressor can reduce variation in volumetric efficiency between products.

  The compressor according to the second invention is the compressor according to the first invention, and the laser welding is performed through the head.

  In this compressor, laser welding is performed through the head. For this reason, in this compressor, the space between the cylinder hole and the heat insulating space is well sealed.

  The compressor according to the third invention is the compressor according to the first invention or the second invention, wherein the head is located between the cylinder hole and the heat insulation space, and is located on the outer peripheral side of the heat insulation space. It is laser welded to the cylinder block.

  In this compressor, the head is laser welded to the cylinder block at a position corresponding to between the cylinder hole and the heat insulating space and a position corresponding to the outer peripheral side of the heat insulating space. For this reason, in this compressor, not only the sealing performance between the cylinder hole and the heat insulating space can be secured, but also the sealing performance of the heat insulating space can be secured.

  A compressor according to a fourth aspect is the compressor according to any one of the first to third aspects, wherein the cylinder block and the head are formed by a semi-molten die casting method.

  In this compressor, the cylinder block is formed by a semi-molten die casting method. For this reason, in this compressor, in addition to being able to use laser welding for fastening the cylinder block and the head, there is good conformability between the cylinder block and the rotor and sufficient pressure resistance strength of the cylinder block and the head. can get. In addition, when a semi-molten die casting method is used, a near net shape is possible. For this reason, a heat insulation space can be formed more easily than the conventional sand mold forming method.

  In the compressor according to the first invention, the gap between the cylinder hole and the heat insulating space is almost completely sealed. In addition, since it can be made boltless by laser welding, the cylinder can be made smaller and the heat transfer area can be reduced. Therefore, this compressor can reduce variation in volumetric efficiency between products.

  In the compressor according to the second aspect of the invention, the space between the cylinder hole and the heat insulating space is well sealed.

  In the compressor which concerns on 3rd invention, not only the sealing performance between a cylinder hole and heat insulation space is ensured but the sealing performance of heat insulation space is also securable.

  In the compressor according to the fourth aspect of the invention, in addition to being able to use laser welding for fastening the cylinder block and the head, good conformability between the cylinder block and the rotor, sufficient pressure strength of the cylinder block and the head, etc. Is obtained. In addition, when a semi-molten die casting method is used, a near net shape is possible. For this reason, a heat insulation space can be formed more easily than the conventional sand mold forming method.

  As shown in FIG. 1, the swing compressor 1 according to the embodiment of the present invention mainly includes a vertically long cylindrical hermetic dome-shaped casing 10, a swing compression mechanism portion 15, a drive motor 16, a suction pipe 19, A discharge pipe 20 and a terminal 95 are included. In the swing compressor 1, an accumulator (gas-liquid separator) 90 is attached to the casing 10. Hereinafter, the components of the swing compressor 1 will be described in detail.

[Details of swing compressor components]
(1) Casing The casing 10 includes a substantially cylindrical trunk casing portion 11, a bowl-shaped upper wall portion 12 that is airtightly welded to the upper end portion of the trunk casing portion 11, and a lower end of the trunk casing portion 11. And a bowl-shaped bottom wall portion 13 which is welded to the portion in an airtight manner. The casing 10 mainly contains a swing compression mechanism 15 that compresses the gas refrigerant and a drive motor 16 that is disposed above the swing compression mechanism 15. The swing compression mechanism 15 and the drive motor 16 are connected by a crankshaft 17 that is disposed so as to extend in the vertical direction in the casing 10.

(2) Swing compression mechanism unit As shown in FIGS. 1 and 3, the swing compression mechanism unit 15 mainly includes a crankshaft 17, a piston 21, a bush 22, a front head 23, and a cylinder block 24. And the rear head 25. In the present embodiment, the front head 23 and the rear head 25 are fastened together with the cylinder block 24 by fastening laser welding through the fastening portions 23b and 25b along the axial direction 1a of the crankshaft 17. In the present embodiment, the swing compression mechanism 15 is immersed in the lubricating oil L stored at the bottom of the casing 10, and the lubricating oil L is supplied to the swing compression mechanism 15 by differential pressure. It is like that. Hereinafter, the components of the swing compression mechanism 15 will be described in detail.

a) Cylinder Block As shown in FIGS. 1 and 2, the cylinder block 24 is formed with a cylinder hole 24a, a suction hole 24b, a discharge passage 24c, a bush accommodation hole 24d, a blade accommodation hole 24e, and a heat insulation groove 24f. ing. As shown in FIGS. 1 and 2, the cylinder hole 24 a is a cylindrical hole penetrating along the thickness direction. The suction hole 24b extends through the cylinder hole 24a from the outer peripheral wall surface. The discharge path 24c is formed by cutting out a part of the inner peripheral side of the cylindrical portion that forms the cylinder hole 24a. The bush housing hole 24d is a hole that penetrates along the plate thickness direction, and is located between the suction hole 24b and the discharge passage 24c when viewed along the plate thickness direction. The blade accommodation hole 24e is a hole that penetrates along the plate thickness direction and communicates with the bush accommodation hole 24d. The heat insulating grooves 24f are a plurality of grooves formed on both upper and lower sides along the penetrating direction of the cylinder hole 24a, and are for insulating the cylinder chamber Rc.

  In the cylinder block 24, the eccentric shaft portion 17a of the crankshaft 17 and the rotor portion 21a of the piston 21 are accommodated in the cylinder hole 24a, and the blade portion 21b and the bush 22 of the piston 21 are accommodated in the bush accommodation hole 24d. When the blade portion 21b of the piston 21 is accommodated in the accommodation hole 24e, the discharge passage 24c is fitted to the front head 23 and the rear head 25 so as to face the front head 23 side (see FIG. 3). As a result, a cylinder chamber Rc1 is formed in the swing compression mechanism portion 15, and this cylinder chamber Rc1 is partitioned by the piston 21 into a suction chamber that communicates with the suction hole 24b and a discharge chamber that communicates with the discharge passage 24c. Become. In this state, the rotor portion 21a is fitted into the eccentric shaft portion 17a. Moreover, nothing is accommodated in the heat insulation hole 24f. The heat insulating holes 24f are preferably in a state as close to a vacuum as possible.

b) Crankshaft The crankshaft 17 is provided with an eccentric shaft portion 17a at one end. The crankshaft 17 is fixed to the rotor 52 of the drive motor 16 on the side where the eccentric shaft portion 17a is not provided.

c) Piston The piston 21 has a substantially cylindrical rotor portion 21a and a blade portion 21b protruding outward in the radial direction of the rotor portion 21a. The rotor portion 21 a is inserted into the cylinder hole 24 a of the cylinder block 24 while being fitted to the eccentric shaft portion 17 a of the crankshaft 17. Thereby, when the crankshaft 17 rotates, the rotor portion 21a performs a revolving motion around the rotation shaft of the crankshaft 17. The blade portion 21b is housed in the bush housing hole 24d and the blade housing hole 24e. As a result, the blade portion 21b swings and moves forward and backward along the longitudinal direction.

d) Bush The bush 22 is a substantially semi-cylindrical member, and is accommodated in the bush accommodation hole 24d so as to sandwich the blade portion 21b of the piston 21.

e) Front Head The front head 23 is a member that covers the discharge path 24 c side of the cylinder block 24 and is fitted to the casing 10. A bearing portion 23a is formed in the front head 23, and the crankshaft 17 is inserted into the bearing portion 23a. The front head 23 has an opening (not shown) for guiding the refrigerant gas flowing through the discharge passage 24 c formed in the cylinder block 24 to the discharge pipe 20. And this opening is obstruct | occluded or open | released by the discharge valve (not shown) for preventing the reverse flow of refrigerant gas. The front head 23 is provided with a fastening portion 23b. The fastening part 23b is thinned so that penetration laser welding is possible.

f) Rear Head The rear head 25 covers the opposite side of the cylinder block 24 to the discharge path 24c side. A bearing portion 25a is formed in the rear head 25, and the crankshaft 17 is inserted into the bearing portion 25a. The rear head 25 is provided with a fastening portion 25b. The fastening part 25b is thinned so that penetration laser welding is possible, like the fastening part 23a of the front head 23.

(3) Drive Motor The drive motor 16 is a DC motor in the present embodiment, and mainly includes an annular stator 51 fixed to the inner wall surface of the casing 10 and a slight gap (air gap) inside the stator 51. The rotor 52 is rotatably accommodated with a passage).

  In the stator 51, a copper wire is wound around a tooth portion (not shown), and a coil end 53 is formed above and below. Further, the outer peripheral surface of the stator 51 is provided with core cut portions (not shown) that are notched at a plurality of locations from the upper end surface to the lower end surface of the stator 51 and at predetermined intervals in the circumferential direction. .

  The crankshaft 17 is fixed to the rotor 52 along the rotation axis.

(4) Suction Pipe The suction pipe 19 is provided so as to penetrate the casing 10, one end is fitted in the suction hole 24 b formed in the cylinder block 24, and the other end is fitted in the accumulator 90. .

(5) Discharge pipe The discharge pipe 20 is provided so as to penetrate the upper wall portion 12 of the casing 10.

(6) Terminal As shown in FIG. 1, the terminal 95 is mainly composed of a terminal pin 95a and a terminal body 95b. The terminal pin 95a is supported by a terminal body 95b, and the terminal body 95b is fitted into the upper wall portion 12 of the casing 10 and welded. A lead wire (not shown) extending from the coil end 53 is connected to the casing 10 inside of the terminal pin 95a, and an external power source (not shown) is connected to the casing 10 outside of the terminal pin 95a.

[Manufacturing method of main parts]
In the swing compressor 1 according to the present embodiment, the piston 21, the cylinder block 24, the front head 23, the rear head 25, and the crankshaft 17 are manufactured according to the following manufacturing method.

(1) Raw material In the present embodiment, the iron raw material used as the raw material of the main part is C: 2.3 to 2.4 wt%, Si: 1.95 to 2.05 wt%, Mn: 0.6 to 0 7 wt%, P: <0.035 wt%, S: <0.04 wt%, Cr: 0.00-0.50 wt%, Ni: 0.50-1.00 wt% are added. The In addition, the weight ratio here is a ratio with respect to the whole quantity. Here, the “billet” means a material before final molding which is formed into a cylindrical shape or the like by a continuous casting apparatus after the iron material having the above components is melted in a melting furnace. Here, the content of C and Si is such that the tensile strength and tensile modulus are higher than those of flake graphite cast iron, and the fluidity suitable for molding a sliding part substrate having a complicated shape is provided. Be determined to satisfy both. The content of Ni is determined so as to constitute a metal composition suitable for improving the toughness of the metal structure and preventing surface cracks during molding.

(2) Manufacturing process The said main components are manufactured through a semi-molten die-casting process, a heat treatment process, and a final finishing process. Hereinafter, each process is explained in full detail.

a) Semi-molten die-cast molding process In the semi-molten die-cast molding process, first, the billet is heated to a high frequency to be in a semi-molten state. Next, when the billet in the semi-molten state is poured into a predetermined mold, the billet is formed into a desired shape while applying a predetermined pressure with a die casting machine to obtain a component base. When the component base is taken out of the mold and rapidly cooled, the metal structure of the component base is entirely whitened. Note that the component base is slightly larger than the finally obtained component, and this component base becomes the final component after the machining allowance is removed in the final finishing step.

b) Heat treatment step In the heat treatment step, the component substrate after the semi-molten die casting molding step is heat treated. In this heat treatment step, the metal structure of the component base changes from a whitened structure to a metal structure composed of pearlite / ferrite matrix and granular graphite. The graphitization and pearlization of the whitened structure can be adjusted by adjusting the heat treatment temperature, holding time, cooling rate, and the like. For example, as described in Honda R & D Technical Review Vol.14 No.1 paper "Study on the semi-melting technology of iron", cooling at 0.05 to 0.10 ° C / sec after holding at 950 ° C for 60 minutes By slowly cooling in the furnace at a speed, tensile strength of about 500 MPa to 700 MPa, HB150 (HRB81 (converted value from SAE J417 hardness conversion table)) to HB200 (HRB96 (SAE J417 hardness conversion table) A metal structure having a hardness of the order of conversion))) can be obtained. Such a metal structure is soft and excellent in machinability because it has a ferrite center, but there is a possibility of forming a cutting edge during machining and reducing the tool life. In addition, after holding at 1000 ° C. for 60 minutes, air cooling, and further holding for a predetermined time at a temperature slightly lower than the initial temperature and then air cooling, tensile strength of about 600 MPa to 900 MPa, HB200 (HRB96 (SAE J 417 hardness conversion) Conversion value from the table)) to HB250 (HRB105, HRC26 (conversion value from SAE J417 hardness conversion table, HRB105 is a reference value because it exceeds the effective practical range of the test type))) A metal structure can be obtained. In such a metal structure, those having hardness equivalent to flake graphite cast iron have machinability equivalent to flake graphite cast iron, and machinability compared to spheroidal graphite cast iron having equivalent ductility and toughness. Is excellent. In addition, by holding the oil at 1000 ° C. for 60 minutes, cooling with oil, and holding the air at a temperature slightly lower than the initial temperature for a predetermined time and then air cooling, tensile strength of about 800 MPa to 1300 MPa, HB250 (HRB105, HRC26 (SAE J 417) Conversion value from hardness conversion table, HRB105 is a reference value because it exceeds the effective practical range of test type))-HB350 (HRB122, HRC41 (converted value from SAE J417 hardness conversion table, HRB122) It is possible to obtain a metal structure having a hardness of a reference level because it exceeds the effective practical range of the test type. Such a metal structure is hard because it has a pearlite center and is inferior in machinability, but has excellent wear resistance.

  In this embodiment, in this heat treatment step, the hardness of the component base is higher than HRB90 (HB176 (converted value from SAE J417 hardness conversion table)) and HRB100 (HB219 (SAE J417 from hardness conversion table). The heat treatment is carried out under such a condition that the value becomes lower than the conversion value)). When the component base is manufactured by a semi-molten die casting method, it is clear that the hardness of the component base is proportional to the tensile strength of the component base. Substantially corresponds to a range of 600 MPa to 900 MPa.

c) Final finishing process In the final finishing process, the component base is machined to complete the component. However, in the present embodiment, the cylinder block 24 is manufactured through a quenching process after the heat treatment process and before the final finishing process. In the quenching process, a high-frequency heater (not shown) is inserted into the bush housing hole 24d, and the cylinder block 24 is quenched so that the hardness of the portion around the bush housing hole 24d is higher than HRC50 and lower than HRC65. Is done.

[Assembly of compression mechanism]
In the embodiment of the present invention, the compression mechanism 15 is manufactured through a crimping process and a penetration laser welding process.

  In the crimping step, the heads 23 and 25 are positioned and crimped to the cylinder block 24 in a state where the eccentric shaft portion 17a and the rotor portion 21a of the crankshaft 17 are accommodated in the cylinder hole 24a. In this crimping step, the front head 23 and the rear head 25 may be simultaneously crimped to the cylinder block 24, or only one of the heads 23, 25 may be crimped first. When only one of the heads 23 and 25 is pressure-bonded, the head 23 is subjected to penetration laser welding to the cylinder block 25, and then the other head 23 and 25 is pressure-bonded and subjected to penetration laser welding. In the penetrating laser welding process, the laser beams LS are irradiated from the direction indicated by the solid arrows in FIG. 4 to the heads 23 and 25 that are pressure-bonded to the cylinder block 24, and the heads 23 and 25 are penetrating laser welded to the cylinder block 24. The In the present embodiment, the welding position Pw of the heads 23 and 25 is a position corresponding to between the cylinder hole 24a of the cylinder block 24 and the heat insulating groove 24f of the heads 23 and 25, as shown in FIG. , And a position corresponding to the outer peripheral side of the heat insulation groove 24f of the cylinder block 24 in the heads 23 and 25. In order to guarantee the swing of the piston 21 and the rotational movement of the bush 22, penetration laser welding is not performed at positions corresponding to the blade portion 21 b and the bush 22 of the piston 21. In the present embodiment, no bolts are used for assembling the compression mechanism section 15.

[Operation of swing compressor]
When the drive motor 16 is driven, the eccentric shaft portion 17a rotates eccentrically around the crankshaft 17, and the roller portion 21a fitted to the eccentric shaft portion 17a causes the outer peripheral surface to become the inner peripheral surface of the cylinder chamber Rc1. Revolve in contact. As the roller portion 21 a revolves in the cylinder chamber Rc, the blade portion 21 b moves forward and backward while being held by the bush 22 on both sides. Then, the low-pressure refrigerant gas is sucked into the suction chamber 19 from the suction port 19 and is compressed in the discharge chamber to be high pressure, and then the high-pressure refrigerant gas is discharged from the discharge passage 24c.

[Characteristics of swing compressor]
(1)
In the swing compressor 1 according to the embodiment of the present invention, the front head 23 and the rear head 25 are through-laser welded to the cylinder block 24 at a position corresponding to between the cylinder hole 24a and the heat insulating groove 24f of the cylinder block 24. It is concluded. For this reason, in this swing compressor 1, the space between the cylinder hole 24a and the heat insulating groove 24f is almost completely sealed. Therefore, the swing compressor 1 can reduce the variation in volumetric efficiency between products.

(2)
In the swing compressor 1 according to the embodiment of the present invention, the front head 23 and the rear head 25 are located between the cylinder hole 24a and the heat insulation groove 24f of the cylinder block 24 and the heat insulation groove 24f of the cylinder block 24. Through laser welding is performed on the cylinder block 24 at a position corresponding to the outer peripheral side. For this reason, in this swing compressor 1, the sealing property of the heat insulation groove 24f can be ensured.

(3)
In the swing compressor 1 according to the embodiment of the present invention, the front head 23, the rear head 25, and the cylinder block 24 are formed by a semi-molten die casting method. For this reason, in this swing compressor 1, in addition to being able to use laser welding to fasten the cylinder block 24 and the heads 23 and 25, good compatibility between the cylinder block 24 and the rotor portion 21a and the cylinder block 24 and sufficient pressure resistance of the heads 23 and 25 can be obtained.

(4)
In the swing compressor 1 according to the embodiment of the present invention, no bolt is used for assembling the swing compression mechanism portion 15. For this reason, in this swing compressor 1, it is not necessary to provide bolt holes in the front head 23, the cylinder block 24, and the rear head 25. For this reason, the swing compressor 1 is reduced in diameter. Moreover, since the cost of the conventionally used bolt is unnecessary, the manufacturing cost of the swing compressor 1 is reduced.

[Modification]
(A)
In the swing compressor 1 according to the previous embodiment, the heads 23 and 25 are fastened to the cylinder block 24 by through laser welding, and the swing compression mechanism portion 15 is assembled. Here, such an assembly technique is applied to the cylinder block 124 and the head (not shown, but the same as the heads 23 and 25 according to the previous embodiment) of the rotary compressor 101 as shown in FIG. May be. That is, the cylinder block is located at a position where the front head and the rear head of the rotary compressor 101 correspond to between the cylinder hole 124a and the heat insulation groove 124f of the cylinder block 124 and on the outer peripheral side of the heat insulation groove 124f of the cylinder block 124. That is, the laser beam may be penetrated and welded to 124. 6 and 7, reference numeral 117 indicates a crankshaft, reference numeral 117a indicates an eccentric shaft portion of the crankshaft, reference numeral 121 indicates a rotor, reference numeral 122 indicates a vane, reference numeral 123 indicates a spring, Reference numeral 124b indicates a suction hole, reference numeral 124c indicates a discharge passage, reference numeral 124d indicates a vane accommodation hole, and reference numeral Rc2 indicates a cylinder chamber.

(B)
In the swing compressor 1 according to the previous embodiment, mainly the position corresponding to the position between the cylinder hole 24a of the cylinder block 24 and the heat insulating groove 24f in the heads 23 and 25 and the cylinder block in the heads 23 and 25. Through laser welding was performed discontinuously at positions corresponding to the outer peripheral side of the 24 heat insulation grooves 24 f, and the heads 23 and 25 were fastened to the cylinder block 24. However, the penetration laser welding may be performed continuously as shown in FIG. In this way, the sealing performance between the cylinder hole 24a and the heat insulating groove 24f and the sealing performance of the heat insulating groove 24f can be further improved.

(C)
In the swing compressor 1 according to the previous embodiment, the irradiation direction of the laser beam LS is along the axis 1a of the crankshaft 17, but the irradiation direction of the laser beam LS is as shown in FIG. You may incline with respect to the 17 axis | shaft 1a.

(D)
In the swing compressor 1 according to the previous embodiment, the heads 23 and 25 are penetrating laser welded to the cylinder block 24. However, in the heads 23 and 25, a position corresponding to the space between the cylinder hole 24a of the cylinder block 24 and the heat insulation groove 24f, and a position of the heads 23 and 25 corresponding to the outer peripheral side of the heat insulation groove 24f of the cylinder block 24. Through holes 23c and 25c as shown in FIG. 10 may be provided, and the walls of the through grooves 23c and 25c and the cylinder block 24 may be corner-welded. In such a case, laser welding may be performed using a filler, or laser welding may be performed without using a filler.

(E)
In the swing compressor 1 according to the previous embodiment, the heat insulating grooves 24f are formed on both upper and lower sides, but the heat insulating grooves may penetrate in the plate thickness direction like the cylinder holes 24a.

(F)
In the swing compressor 1 according to the previous embodiment, the heat insulating grooves 24f are divided into four parts, but the heat insulating grooves may be formed so that all the heat insulating grooves communicate with each other.

(G)
Although the swing compressor 1 according to the previous embodiment is a one-cylinder type swing compressor, the assembly technique of the swing compression mechanism unit 15 according to the present invention is a two-cylinder type swing compressor or rotary compressor. Is also applicable.

(H)
In the swing compressor 1 according to the previous embodiment, the swing compression mechanism unit 15 is assembled without bolts. However, not only through laser welding but also bolts may be used for assembling the swing compression mechanism portion 15.

It is a longitudinal section of a swing compressor concerning an embodiment of the invention. It is an upper surface of the cylinder block which comprises the swing compressor which concerns on embodiment of this invention. It is AA sectional drawing of the compression mechanism part which comprises the swing compressor which concerns on embodiment of this invention. It is a figure which shows the laser irradiation direction in the penetration laser welding which concerns on embodiment of this invention. It is a figure which shows the penetration laser welding part of the head which concerns on embodiment of this invention (In addition, the head is drawn partially). It is an upper surface of the cylinder block which comprises the rotary compressor which concerns on a modification (A). It is a cross-sectional view of the compression mechanism part of the rotary compressor which concerns on a modification (A). It is a figure which shows the penetration laser welding part of the head which concerns on a modification (B) (In addition, the head is drawn partially). It is a figure which shows the laser irradiation direction which concerns on a modification (C). It is a figure which shows the aspect of the corner welding which concerns on a modification (D).

Explanation of symbols

1 Swing compressor (compressor)
17, 117 Crankshaft 17a, 117a Eccentric shaft portion 21a Rotor portion 23 Front head (head)
25 Rear head (head)
24,124 Cylinder block 24a, 124a Cylinder hole 24f, 124f Insulation groove (insulation space)
101 Rotary compressor (compressor)
121 rotor

Claims (4)

A crankshaft (17, 117) having an eccentric shaft portion (17a, 117a);
A rotor (21a, 121) fitted to the eccentric shaft portion;
A cylinder block (24, 124) having a cylinder hole (24a, 124a) for accommodating the eccentric shaft portion and the rotor, and a heat insulating space (24f, 124f) formed on the outer periphery of the cylinder hole;
A head (23, 25) that is laser welded to the cylinder block at a position corresponding to the space between the cylinder hole and the heat insulation space, and covers the cylinder hole and the heat insulation space;
A compressor (1, 101). The laser welding is performed through the head,
The compressor according to claim 1. The head is laser welded to the cylinder block at a position corresponding to the space between the cylinder hole and the heat insulating space and a position corresponding to the outer peripheral side of the heat insulating space.
The compressor according to claim 1 or 2. The cylinder block and the head are formed by a semi-molten die casting method,
The compressor according to any one of claims 1 to 3.

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