JP6289649B2 - Compressor and manufacturing method of compressor - Google Patents

Description

  The present invention relates to a compressor and a method for manufacturing the compressor.

  A conventional compressor is connected to a suction connection pipe having one end connected to the cylinder of the compression mechanism, a joint pipe connected to the airtight container and having the suction connection pipe inserted therein, and the other end of the suction connection pipe. One having a suction pipe has been proposed (see, for example, Patent Document 1). In the compressor described in Patent Document 1, the joining pipe is made of copper, and the suction connecting pipe and the joining pipe are fixed by brazing.

  Further, the conventional compressor includes a suction connection pipe connected to the cylinder of the compression mechanism, and an opening into which the suction connection pipe is inserted, and a sealed container to which the suction connection pipe is joined to the opening. What has is proposed (for example, refer patent document 2). In the compressor described in Patent Document 2, a flange protruding from the inner peripheral surface side to the outer peripheral surface side is formed on the outer peripheral surface of the suction connection pipe. Then, the flange of the suction connection pipe and the portion where the opening of the sealed container is formed are joined by projection welding (resistance welding).

Japanese Patent Laid-Open No. 11-182434 (see, for example, FIG. 1) Japanese Examined Patent Publication No. 7-117043 (for example, see FIG. 1)

  In the compressor described in Patent Document 1, the suction connection pipe and the joining pipe are joined by gas brazing. In performing gas brazing, in consideration of efficiency and quality, a copper material is used for the joint between the suction connection pipe and the joint pipe. For this reason, for example, it is necessary to perform copper plating on the end portion that becomes the joint portion of the suction connection pipe, or to joint a copper pipe to the end portion of the suction connection pipe in advance, which increases the manufacturing cost of the compressor. There is a problem of doing it.

  Moreover, the compressor of patent document 2 installs an electrode in the formation position of a flange, and implements resistance welding. That is, since resistance welding is performed while pressing the electrode against the flange, the flange and the sealed container are pressed against each other. For this reason, when a flange and an airtight container press each other, there exists a possibility of causing the distortion of an airtight container. Further, since the suction connecting pipe formed with the flange is connected to the compression element, there is a possibility that the compression element is also distorted when the flange is pushed. As described above, the compressor described in Patent Document 2 has a problem in that the reliability of the sealed container and the compression element is reduced due to the distortion of the sealed container and the compression element.

  The present invention has been made in order to solve the above-described problems, and includes a compressor and a compressor capable of suppressing a decrease in reliability while suppressing an increase in manufacturing cost. The object is to provide a manufacturing method.

A compressor according to the present invention is provided with a sealed container, a compression element that is provided in the sealed container and compresses the refrigerant, an electric motor element that is provided in the sealed container and drives the compression element, and one of them is connected to the sealed container. and iron joint tube has been inserted into the junction pipe, and the suction connection pipe made of iron one is connected to the compression element, one and a suction tube connected to the other of the suction connection pipe, the intake connection pipe And an annular first protrusion that is provided at the other end and protrudes from the inner peripheral side to the outer peripheral side. The joint pipe has an annular inner diameter corner on the inner peripheral surface of the other end, and the suction connection pipe and the joint pipe have a taper of the first protrusion of the suction connection pipe. It has a 1st welding part by which the surface part and the internal-diameter corner | angular part of the other edge part of the joining pipe were welded .

In the compressor according to the present invention, the inhalation connection pipe for connecting the the suction pipe compression mechanism is connected to the sealed container, der which the junction pipe suction connection pipe is inserted, is joined Therefore, since it is not necessary to configure these with expensive copper compared to iron, an increase in manufacturing cost can be suppressed.

According to the compressor of the present invention, even when joining with a welding means that applies a force for pressing the suction connection pipe against the closed container side, such as resistance welding, the force is prevented from being applied to the compression container and the compression element. be able to. That is, according to the compressor according to the present invention, since the joint pipe is provided, even when the suction connection pipe is pressed against the sealed container side when the suction connection pipe and the joint pipe are joined, the suction connection pipe is not Direct pressing against the sealed container side can be suppressed, and the pressing force is suppressed from being applied directly to the sealed container and the compression element.
Further, according to the compressor according to the present invention, since the joining pipe is provided, for example, when the resistance welding is performed, the suction connecting pipe is pressed against the sealed container side to perform the resistance welding while holding the joining pipe. be able to. For this reason, when the suction connection pipe is pressed against the closed container side, the pressing force is suppressed from being applied to the closed container and the compression element.
Thus, according to the compressor according to the present invention, for example, when it is joined by performing resistance welding, it has a configuration that can suppress the occurrence of distortion in the sealed container and the compression element. Can be reduced.

It is sectional drawing which shows typically the structure of the compressor 100 which concerns on Embodiment 1 of this invention. FIG. 2 is a cross-sectional view schematically showing joining of a suction connecting pipe 12 and a joining pipe 10 of the compressor 100 shown in FIG. 1. 3 is a schematic diagram illustrating a configuration of a bonded tube 10. FIG. 3 is a schematic diagram illustrating a configuration of a suction connection pipe 12. FIG. 3 is a schematic diagram illustrating a configuration of a suction pipe 15. FIG. It is a schematic diagram explaining a 1st welding part. FIG. 3 is a horizontal cross-sectional view schematically showing a configuration of resistance welding electrodes (first electrode 20 and second electrode 21) in joining the suction connection pipe 12 and the joining pipe 10 shown in FIG. 2. It is the figure which showed typically the structure of the 2nd electrode 21 for resistance welding shown in FIG. It is a perspective view which shows typically the structure of the 1st electrode 20 for resistance welding shown in FIG. It is a side view which shows typically the structure of the 1st electrode 20 for resistance welding shown in FIG. 3 is a flowchart for manufacturing the compressor 100. It is the modification of the joining pipe 10 of the compressor 100 which concerns on Embodiment 1 of this invention, Comprising: It is a schematic diagram explaining the aspect which made the electrode receiving part the taper shape. It is sectional drawing which shows typically about joining of the suction connection pipe 120 and the joining pipe 110 of the compressor 100 which concerns on Embodiment 2 of this invention. It is a schematic diagram explaining the structure of the joining pipe | tube 110. FIG. 3 is a schematic diagram illustrating a configuration of a suction connection pipe 120. FIG. FIG. 10 is a schematic diagram illustrating a modification of the joint pipe 110 of the compressor 100 according to Embodiment 2 of the present invention, in which a configuration in which a protrusion is formed is a suction connection pipe 120. It is explanatory drawing of the prior art example 1. FIG. It is explanatory drawing of the prior art example 2. FIG.

  Hereinafter, the compressor 100 according to the present invention will be described with reference to the drawings. Here, in FIG. 1 and the following drawings, the same reference numerals denote the same or corresponding parts, and are common to the embodiments described below.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view schematically showing the configuration of the compressor 100 according to the first embodiment. FIG. 2 is a cross-sectional view schematically showing the joining of the suction connection pipe 12 and the joining pipe 10 of the compressor 100 shown in FIG. 3A to 3D are schematic views for explaining the configuration of the joining pipe 10 and the like and the first welded portion P. FIG. The configuration of the compressor 100 will be described with reference to FIGS. 1, 2, and 3A to 3D. 1, 2, and 3 </ b> A to 3 </ b> D are longitudinal sectional views of various configurations.

[Description of configuration]
As shown in FIG. 1, the compressor 100 includes a sealed container 1, an electric element 2, a compression element 3, and an accumulator 14 that stores liquid refrigerant. The compressor 100 also includes a joining pipe 10 connected to the sealed container 1, a suction connecting pipe 12 inserted into the joining pipe 10, and a suction pipe 15 that connects the accumulator 14 and the suction connecting pipe 12. ing.
Here, as will be described later, the joining pipe 10 and the suction connecting pipe 12 are joined by resistance welding. A welded part (joined part) between the joined pipe 10 and the suction connecting pipe 12 corresponds to the first welded part P. Moreover, the sealed container 1 and the joining pipe 10 are joined by resistance welding (projection welding), for example. The welded portion between the sealed container 1 and the joining pipe 10 corresponds to the second welded portion. Furthermore, the suction pipe 15 and the suction connection pipe 12 are joined together by brazing or arc welding, for example.

(Sealed container 1)
The hermetic container 1 contains an electric element 2 and a compression element 3. An accumulator 14 is connected to the sealed container 1 through various pipes. The sealed container 1 has a bottomed cylindrical body 1A and an upper shell 1B attached to an opening formed in the upper part of the lower container. The upper shell 1B is press-fitted into the body portion 1A and connected by arc welding. An opening to which the suction connection pipe 12 and the joining pipe 10 are attached is formed in the body 1A of the sealed container 1. A discharge pipe 9 that discharges the refrigerant compressed by the compression element 3 is connected to the upper shell 1B.

(Electric element 2)
The electric element 2 includes, for example, a stator 2A that is fixed to the inner peripheral surface of the hermetic container 1, and a rotor 2B that is rotatably provided inside the stator 2A. The stator 2A is wound with, for example, a winding through which a current flows. The rotor 2B is connected to a drive shaft 4 of a compression element 3 described later.

(Compression element 3)
The compression element 3 includes a cylinder 5 having a space for compressing refrigerant gas, a drive shaft 4 that transmits a driving force of the electric element 2, an upper bearing 7 and a lower bearing 8 that support the drive shaft 4, and the drive shaft 4. It has a rolling piston 6 that is fitted to the eccentric portion and rotates in the cylinder 5.
The cylinder 5 is one to which one end of the suction connection pipe 12 is connected. The refrigerant in the accumulator 14 is supplied to the cylinder 5. The cylinder 5 is provided with a rolling piston 6, and the refrigerant is compressed by the action of the rolling piston 6. The drive shaft 4 has an upper end connected to the rotor 2 </ b> B and a lower end connected to the upper bearing 7 and the lower bearing 8. The drive shaft 4 is used to transmit the driving force of the electric element 2 to the rolling piston 6. The upper bearing 7 and the lower bearing 8 are installed on the upper surface portion and the lower surface portion of the cylinder 5.

(Accumulator 14)
The accumulator 14 is used to store liquid refrigerant and supply gas refrigerant to the compression element 3, and a refrigerant inflow pipe 14 </ b> A is connected to the upper part of the accumulator 14. A suction pipe 15 is connected to the lower part of the accumulator 14.

(Joint tube 10)
One of the joining pipes 10 is an iron member that is connected to the sealed container 1 and into which the suction connecting pipe 12 is inserted. As shown in FIG. 3A, the joining tube 10 includes a reduced diameter portion 10A1 joined to the body portion 1A of the sealed container 1, a tubular tubular portion 10A2 formed so as to extend in the horizontal direction, and a tubular portion. It has projection part 10A3 formed in the other edge part of 10A2. Here, the protrusion 10A3 corresponds to the second protrusion.

The reduced diameter portion 10A1 is formed so that the outer diameter decreases from the joining tube 10 side toward the compression element 3 side. That is, the reduced diameter portion 10 </ b> A <b> 1 is formed such that the outer diameter decreases from the other side of the bonded tube 10 toward the one side. The reduced diameter portion 10A1 is formed at one end of the cylindrical portion 10A2. The reduced diameter portion 10 </ b> A <b> 1 is provided at the opening portion of the body portion 1 </ b> A of the sealed container 1 and is joined to the opening forming portion of the sealed container 1. The reduced diameter portion 10A1 and the body portion 1A are joined by, for example, resistance welding.
The cylindrical portion 10A2 is a member having a circular cross-sectional shape. The cylindrical portion 10A2 has a reduced diameter portion 10A1 formed at one end and a protruding portion 10A3 formed at the other end. A suction connection pipe 12 is inserted into the cylindrical portion 10A2. That is, the inner peripheral surface of the cylindrical portion 10A2 and the outer peripheral surface of the suction connection pipe 12 (the straight pipe portion 12A2 of the suction connection pipe 12) face each other.

The protruding portion 10A3 is formed at the other end of the cylindrical portion 10A2, protrudes from the inner peripheral side to the outer peripheral side, and is provided closer to the compression element 3 than the protruding portion 12A3. Between the protrusion 10A3 and the outer peripheral surface of the sealed container 1, a second electrode 21 described later is installed. The protruding portion 10A3 has an inner diameter corner portion 10A4 formed on the inner peripheral surface at the position where the protruding portion 10A3 is formed.
The inner diameter corner 10 </ b> A <b> 4 is formed on the inner peripheral surface of the other end of the bonded tube 10. The inner diameter corner portion 10A4 is formed over the entire circumference of the inner peripheral surface of the other end portion. The inner diameter corner portion 10A4 preferably has an edge shape of 90 degrees, but may have a fine burr or chamfered shape. The inner diameter corner portion 10A4 is joined in a state where the protruding portion 12A3 is pressed. That is, the protrusion 12A3 has a tapered surface portion 12A4 corresponding to the inner diameter corner portion 10A4, and the tapered surface portion 12A4 and the inner diameter corner portion 10A4 are in contact with each other. The suction connection pipe 12 is resistance welded while being pressed against the sealed container 1 by the action of the first electrode 20 described later.

(Suction connection pipe 12)
The suction connection pipe 12 is an iron member having one end connected to the compression element 3 and the other connected to the suction pipe 15. In other words, the suction connection pipe 12 communicates the compression element 3 and the suction pipe 15. The suction connection pipe 12 is joined to the suction pipe 15 in advance. It is preferable that the suction connection pipe 12 and the suction pipe 15 are integrally joined by brazing in the furnace when the accumulator 14 is manufactured, but can be joined by gas brazing, arc welding, laser welding, or the like. . The suction connection pipe 12 is preferably produced by molding such as forging, but can also be obtained by machining.

  As shown in FIG. 3B, the suction connection pipe 12 has one end connected to the compression element 3 and is formed at a cylindrical cylindrical portion 12AA extending in the horizontal direction and the other end of the cylindrical portion 12AA. And a protruding portion 12A3. Here, the protrusion 12A3 corresponds to the first protrusion.

  The cylindrical portion 12AA is inserted into the opening of the body portion 1A of the sealed container 1, and is connected to the compression element 3 and one end is connected to the compression element connection portion 12A1, and the other end is connected to the compression element connection portion 12A1. The end portion is connected to the projecting portion 12A3, and has a straight tube portion 12A2 facing the inner peripheral surface of the bonded tube 10. The compression element connecting portion 12A1 is formed to have an outer diameter smaller than that of the straight pipe portion 12A2. The straight pipe portion 12A2 is inserted into the joining pipe 10. That is, the joint pipe 10 has a function of guiding the suction connection pipe 12 when the suction connection pipe 12 is connected to the compression element 3.

  The protruding portion 12A3 is an annular member that is formed at the other end of the suction connecting pipe 12 and protrudes from the inner peripheral side to the outer peripheral side. The protruding portion 12A3 is formed with a tapered surface portion 12A4 that is formed so that the outer diameter increases from the compression element 3 side toward the joining tube 10 side. That is, the tapered surface portion 12A4 is formed so that the outer diameter increases as it goes from one side of the suction connection pipe 12 to the other side. Further, the protruding portion 12A3 is formed on the side opposite to the tapered surface portion 12A4, the tapered surface portion 12A4 formed on the surface on the closed container 1 side, the tapered surface portion 12A5 formed on the inner peripheral surface at the position where the protruding portion 12A3 is formed. And a flat surface portion 12A6.

  The tapered surface portion 12A4 is provided so as to contact the inner diameter corner portion 10A4 of the joining tube 10. The tapered surface portion 12A5 is a portion serving as an inlet into which the suction pipe 15 is inserted. The tapered surface portion 12A5 is formed such that the inner diameter increases from the closed container 1 side toward the suction connecting pipe 12 side. That is, the tapered surface portion 12A5 is formed such that the inner diameter increases from one side of the suction connection pipe 12 toward the other side. By forming the tapered surface portion 12A5, the suction pipe 15 can be easily inserted into the pipe insertion portion 12A7 of the suction connection pipe 12. The flat surface portion 12A6 has a flat surface perpendicular to the longitudinal direction of the suction connecting pipe 12. On the flat surface portion 12A6, a first electrode 20 used at the time of resistance welding described later is installed.

(Suction pipe 15)
One of the suction pipes 15 is connected to the suction connection pipe 12 and the other is connected to the accumulator 14. The material of the suction pipe 15 is changed depending on the connection method with the suction connection pipe 12. For example, when the suction pipe 15 and the suction connection pipe 12 are joined by arc welding, laser welding, or the like, the suction pipe 15 must be made of iron, but when joined by integral brazing, gas brazing, or the like, it is made of iron. It may be made of copper.

(First weld P)
As shown to FIG. 3D, the 1st welding part P is formed in the contact surface of protrusion part 12A3 and protrusion part 10A3. That is, it is formed on the contact surface between the tapered surface portion 12A4 and the inner diameter corner portion 10A4. And the other edge part side of the 1st welding part P is formed so that a diameter may expand. The first welded portion P is formed by resistance welding of the suction connection pipe 12 and the joint pipe 10.

[Description of operation]
Next, the operation will be described. When the drive shaft 4 is rotated by the electric element 2, the rolling piston 6 rotates eccentrically in the cylinder 5, so that the refrigerant is introduced into the cylinder 5 from the accumulator 14 through the suction connection pipe 12, and the refrigerant is compressed. Is called. The compressed refrigerant is once discharged into the sealed container 1 and then discharged from the discharge pipe 9 to a condenser or the like (not shown) through the gap of the electric element 2. The refrigerant that has flowed through the condenser, the expansion device, the evaporator, etc. returns to the accumulator 14 again. This cycle is repeated.

[Production method]
FIG. 4 is a horizontal cross-sectional view schematically showing the configuration of the resistance welding electrodes (first electrode 20 and second electrode 21) in the joining of the suction connecting pipe 12 and the joining pipe 10 shown in FIG. is there. FIG. 5A is a diagram schematically showing the configuration of the second electrode 21 for resistance welding shown in FIG. FIG. 5B is a perspective view schematically showing the configuration of the first electrode 20 for resistance welding shown in FIG. FIG. 5C is a side view schematically showing the configuration of the first electrode 20 for resistance welding shown in FIG. FIG. 5D is a flowchart when the compressor 100 is manufactured. A method for manufacturing the compressor 100 will be described with reference to FIGS. 4 and 5A to 5D.

  As shown in FIG. 5D, when connecting the joint pipe 10, the suction connection pipe 12, and the suction pipe 15 of the compressor 100, the following steps are performed. That is, the manufacturing method of the compressor 100 includes a joining pipe connection process, a suction pipe connection process, a suction connection pipe connection process, an electrode installation process, and a resistance welding process.

(Joint pipe connection process)
In the joining pipe connecting step, one end of the iron joining pipe 10 is connected to the body 1 </ b> A of the sealed container 1. Specifically, the welded tube 10 and the body portion 1A are resistance-welded. In addition, resistance welding here is implemented in the state in which the compression element 3, the electric element 2, etc. are not installed in the airtight container 1. FIG. For this reason, resistance welding can be carried out in a state in which a member for holding the inner peripheral side of the body portion 1A of the closed container 1 is installed. For this reason, even if the joining pipe 10 is pressed against the body 1 </ b> A of the sealed container 1 to perform resistance welding, it is possible to suppress the occurrence of distortion in the sealed container 1. The compression element 3 and the like are installed in the hermetic container 1 after the joining pipe connecting process and before the next suction connecting pipe connecting process.

(Suction pipe connection process)
In the suction pipe connecting step, one end of the suction pipe 15 is connected to the other end of the suction connection pipe 12. This suction pipe connection process is a process of connecting the suction pipe 15 and the suction connection pipe 12 in advance before the next suction connection pipe connection process. In this suction pipe connecting step, for example, joining is performed by brazing in a furnace, gas brazing, arc welding, laser welding, or the like.

(Suction connection pipe connection process)
In the suction connection pipe connection step, an iron suction connection pipe 12 is inserted into the joint pipe 10, and one end of the suction connection pipe 12 is connected to the compression element 3 in the sealed container 1.

(Electrode installation process)
In the electrode installation step, the first electrode 20 is installed on the suction connection pipe 12, and the second electrode 21 is installed on the back surface of the protruding portion 10A3 of the joint pipe 10. That is, in the electrode installation step, the first electrode 20 is installed on the protrusion 12A3 formed in advance at the other end of the suction connection pipe 12, and is formed in advance at the other end of the joining pipe 10, This is a step of installing the second electrode 21 so as to be interposed between the protruding portion 10A3 located closer to the sealed container 1 than the protruding portion 12A and the sealed container 1. The first electrode 20 is installed on the flat surface portion 12A6. Here, the first electrode 20 and the second electrode 21 are electrodes used for resistance welding, and are connected to a power source (not shown) for resistance welding.

  In the electrode installation step, the first electrode 20 and the second electrode 21 are installed such that the first electrode 20 is positioned above the second electrode 21. That is, the sealed container 1 is positioned on the lower side and the suction connection pipe 12 is positioned on the upper side.

The first electrode 20 is disposed on the flat surface portion 12A6 of the suction connection tube 12, and the suction connection tube 12 is pressed against the joint tube 10 by pressing the flat surface portion 12A6 downward.
The 2nd electrode 21 is arrange | positioned at the back surface (surface by the side of the airtight container 1) of the joining pipe 10 (projection part 10A3). In other words, the second electrode 21 is arranged in such a manner as to enter the lower side of the protruding portion 10A3 of the bonding tube 10. Accordingly, the second electrode 21 is interposed between the protruding portion 10A3 and the sealed container 1.

  Thereby, the suction connection pipe 12 is pressed against the joining pipe 10 by pressing the first electrode 20 downward. For this reason, even if the first electrode 20 presses the suction connection pipe 12 downward, it is possible to prevent the sealed tube 1 from being depressed by the action of the second electrode 21, and Distortion of the container 1 and the compression element 3 can be suppressed. That is, the second electrode 21 receives a pressure force that pushes the joining tube 10 by the suction connecting tube 12 into the sealed container 1, and holds the joining tube 10 so that the sealed container 1 is not loaded.

(Resistance welding process)
The resistance welding process (projection welding process) is a process in which a current is passed through the first electrode 20 and the second electrode 21 to resistance weld the joint pipe 10 and the suction connection pipe 12. By carrying out the resistance welding process, a current flows through the contact portion between the joining pipe 10 and the suction connecting pipe 12 and is heated to join them. A contact surface between the suction connection pipe 12 and the joining pipe 10 is joined by flowing a current having a preset magnitude between the first electrode 20 and the second electrode 21 for a preset time.

[About the first electrode 20 and the second electrode 21]
The configurations of the first electrode 20 and the second electrode 21 will be described. The first electrode 20 and the second electrode 21 used for manufacturing the compressor 100 will be described with reference to FIGS. 4 and 5A to 5C.

  As shown in FIG. 5A, the second electrode 21 adopts a form that is divided into left and right sides (to be front and back) in order to stably join the entire circumferences of the suction connection pipe 12 and the joining pipe 10. The second electrode 21 has an opening 21 </ b> A into which the joining pipe 10 and the suction connection pipe 12 are inserted. Further, the second electrode 21 is formed with a concave portion 21B that is formed by cutting out the back surface portion of the joining tube 10 and a stitch line 22 so that no step is generated in the left and right second electrodes 21. Yes. The concave portion 21B is an annular concave portion, and the protruding portion 10A3 is installed. The opening 21A is formed at the center of the concave portion 21B.

  Further, when the hermetic container 1 and the back surface of the second electrode 21 come into contact with each other, there is a possibility that a portion where the current flows there and is not desired to be joined (or a portion different from the joining location) is joined. Therefore, the second electrode 21 is provided with an insulating material 23 on the surface on the sealed container 1 side.

  In addition, the first electrode 20 and the second electrode 21 can be made of a copper material or a copper alloy material with improved strength. Here, when the distance between the protruding portion 10A3 of the bonding tube 10 and the sealed container 1 is narrow, if the strength of the second electrode 21 is insufficient, the first electrode 20 is pressed against the bonding tube 10. When the second electrode 21 is deformed, a pressure is applied to the sealed container 1 and the sealed container 1 and the cylinder 5 may be distorted. Therefore, as for the 2nd electrode 21, the contact part with the joining pipe | tube 10 is made into a product made from copper or a copper alloy, and the part by the side of the airtight container 1 is good as an iron-type nonmagnetic material, and it is good to ensure intensity | strength.

  As shown in FIG. 5B and FIG. 5C, the first electrode 20 is also divided into left and right like the second electrode 21. The first electrode 20 has a cavity 20A in which the suction pipe 15 is disposed, and an opening 20A1 formed on one side and the other side of the cavity 20A. Further, the first electrode 20 has a flat surface portion 20B that comes into contact with the flat surface portion 12A6 of the suction connection pipe 12. Since the first electrode 20 and the suction connection pipe 12 are configured so that the surfaces of the flat surface portion 12A6 and the flat surface portion 20B coincide with each other, the applied pressure of the first electrode 20 is efficiently reduced to the suction connection tube 12 side. Resistance welding can be carried out more reliably.

[Effects of Compressor 100 according to Embodiment 1]
The compressor 100 according to the first embodiment is connected to the iron suction connection pipe 12 that connects the suction pipe 15 on the accumulator 14 side and the compression element 3, and the sealed container 1, and the suction connection pipe 12 is inserted therein. It has the 1st welding part P formed by joining with the joining pipe 10 made from iron by resistance welding. In other words, the suction connecting pipe 12 and the joining pipe 10 are not joined by brazing, and an increase in manufacturing cost can be suppressed because an expensive material such as copper can be used.

In the compressor 100 according to the first embodiment, the suction connection pipe 12 is not directly pressed against the sealed container 1 and resistance welded, but the suction connection pipe 12 is pressed against the joint pipe 10 and resistance welded. Is. That is, when the suction connection pipe 12 is pressed against the sealed container 1 side, the presence of the joint pipe 10 prevents the pressing force from being applied directly to the sealed container 1 and the compression element 3.
In addition, since the compressor 100 according to the first embodiment includes the joining pipe 10, the suction connecting pipe 12 is pressed against the sealed container 1 side while holding the joining pipe 10 when performing resistance welding. Resistance welding. For this reason, when the suction connection pipe 12 is pressed against the closed container 1, the pressing force is suppressed from being applied to the closed container 1 and the compression element 3.
As described above, the compressor 100 according to the first embodiment has a configuration capable of suppressing the occurrence of distortion in the sealed container 1 and the compression element 3 when the resistance bonding is performed. Can be suppressed.

  Since the compressor 100 according to the first embodiment can suppress the occurrence of distortion in the compression element 3, it can suppress an increase in wear of various members of the compression element 3 based on the distortion, and the reliability is reduced. Can be suppressed.

  The compressor 100 according to the first embodiment welds the joint pipe 10 and the suction connection pipe 12 by resistance welding, and thus suppresses the occurrence of gas scattering, noise, and the like, and prevents the workplace environment from deteriorating. be able to. Note that in brazing, gas scattering, noise, and the like are likely to occur compared to resistance welding.

  In brazing, it is necessary to apply heat to the welded portion until the brazing material can penetrate into the welded portion of the pipe. For this reason, heat may be transmitted to the compression element 3 (cylinder 5 or the like) connected to the suction connection pipe 12 to cause distortion of the compression element 3. In brazing, heat may be applied not only to the welded portion but also to the side surface of the sealed container 1. The heat applied to the side surface of the sealed container 1 may cause distortion of the sealed container 1. On the other hand, in the compressor 100 according to the first embodiment, since the joining pipe 10 and the suction connecting pipe 12 are joined by resistance welding, it is possible to suppress the occurrence of distortion in the compression element 3 due to heat. It is possible to suppress a reduction in reliability.

  FIG. 10 is an explanatory diagram of the first conventional example. In Conventional Example 1, copper plating is applied to the suction connection pipe 12 for joining by brazing. Then, the suction connecting pipe 12 and the guiding copper pipe 10a connected to the joining pipe 10 are brazed. Thus, the manufacturing cost increases by the amount of copper material required. In addition, problems such as performance degradation due to distortion of the cylinder 5 caused by brazing and problems such as deterioration of the work environment may occur. However, in Embodiment 1, these problems can be solved by joining the suction connection pipe 12 and the joining pipe 10 by resistance welding.

  FIG. 11 is an explanatory diagram of the second conventional example. In Conventional Example 2, the suction pipe 15 that also serves as the suction connection pipe is bulged to form a bulging portion 15A having a flat portion, and is bulged on the outer side of the side surface of the hermetic container 1 by burring to bulge the trunk portion. Part 1AA is formed. And the bulging part 15A and the trunk | drum bulging part 1AA of the airtight container 1 are welded. In this method, the sealed container 1 directly receives the pressure applied for resistance welding, and not only the deformation of the sealed container 1, but also the cylinder 5 on the compression element 3 side is deformed. For this reason, the performance of the compressor may be reduced and reliability may be impaired. However, in this Embodiment 1, it has the structure which can prevent the deformation | transformation of the cylinder 5 by adding the joining pipe 10 and receiving a load with the joining pipe 10, and the reliability of the compressor 100 reduces. Can be suppressed.

  Moreover, in the aspect of FIG. 11, it does not have a structure like the joining pipe 10, but the bulging part 15A and the airtight container 1 are contacting directly. For this reason, it is difficult to hold the pressed member (the bulging portion 15A) so as not to be pushed in. On the other hand, since the compressor 100 according to the first embodiment includes the joining pipe 10, it is easy to hold a member that is pushed in during resistance welding.

  In the first embodiment, the aspect in which the suction connection pipe 12 and the joint pipe 10 are joined by resistance welding is described, but the present invention is not limited thereto. A joining method other than resistance welding may be adopted as long as the iron suction connecting pipe 12 and the iron joining pipe 10 can be joined.

[Modification of Embodiment 1]
FIG. 6 is a schematic diagram illustrating a modified example of the joining pipe 10 of the compressor 100 according to the first embodiment, in which the electrode receiving portion is tapered. FIG. 6 is a horizontal sectional view of the joining pipe 10 and the like. As shown in FIG. 6, the joining tube 10 has a cylindrical portion 10 </ b> B <b> 2 that is formed so that the outer diameter increases from one side to the other side. The outer peripheral surface of the cylindrical portion 10B2 is an electrode receiving portion. In the aspect of FIG. 6, a force is applied to expand the second electrode 21 that is divided into left and right, so that it is necessary to add a holding mechanism, but since the load in the vertical direction is reduced, the second electrode 21 There is an effect of extending the life of the electrode 21. Further, there is an effect that the joining tube 10 can be easily formed by forging.

Embodiment 2. FIG.
FIG. 7 is a cross-sectional view schematically showing joining of the suction connection pipe 120 and the joining pipe 110 of the compressor 100 according to the second embodiment. FIG. 8A is a schematic diagram illustrating the configuration of the bonded tube 110. FIG. 8B is a schematic diagram illustrating the configuration of the suction connection pipe 120. The compressor 100 according to the second embodiment will be described with reference to FIGS. 7, 8A and 8B. In the second embodiment, the same reference numerals are given to configurations common to the first embodiment, and differences will be mainly described.

  In the first embodiment, the first welded portion P is formed on the contact surface between the inner diameter corner portion 10A4 of the joining pipe 10 and the tapered surface portion 12A4 of the suction connecting pipe 12. On the other hand, in the second embodiment, the inner diameter corner portion 10A4 is not formed in the joining tube 110, and instead, the cross section parallel to the longitudinal direction of the joining tube 10 is set to be a right angle. And in the joining pipe 110, protrusion 110A4 is formed in the formation position of protrusion part 10A3. In the second embodiment, instead of the projecting portion 12A3 of the suction connecting pipe 120, a projecting portion 120A3 not having the tapered surface portion 12A4 is formed.

  The joining pipe 10 is formed at the other end, protrudes from the inner peripheral side to the outer peripheral side, and has a protruding portion 10A3 provided closer to the compression element 3 than the protruding portion 120A3. And this protrusion part 10A3 is formed so that protrusion part 120A3 may be opposed, and has protrusion 110A4 which protrudes in protrusion part 120A3 side. The protrusion 110A4 is formed in an annular shape along the opposing surfaces of the protrusion 10A3 and the protrusion 120A3. Here, the protrusion 110A4 corresponds to the first protrusion.

  The suction connecting pipe 12 has an annular projecting portion 120A3 formed at the other end and projecting from the inner peripheral side to the outer peripheral side. The protrusion 120A3 and the protrusion 10A3 are provided to face each other. And this protrusion part 120A3 is formed in parallel with the opposing surface with protrusion part 10A3. That is, the surface of the protruding portion 120A3 on the protruding portion 10A3 side is parallel to the vertical direction.

  Although not shown, the first weld P is formed on the contact surface between the protrusion 120A3 and the protrusion 110A4.

[Effects of the compressor 100 according to the second embodiment]
The compressor 100 according to the second embodiment has the following effects in addition to the same effects as the compressor 100 according to the first embodiment.

  In the compressor 100 according to the second embodiment, since the joining pipe 110 has the protrusion 110A4, when the suction connecting pipe 120 is inserted into the cylinder 5, the core of the suction connecting pipe 120 and the joining pipe 110 are arranged. Even if the core is misaligned, the contact surface between the projecting portion 120A3 and the projecting portion 10A3 is stabilized, so that the joining quality can be improved.

[Modification of Embodiment 2]
FIG. 9 is a schematic diagram illustrating a modified example of the joint pipe 110 of the compressor 100 according to the second embodiment, in which the suction connection pipe 120 is used to form a protrusion. As shown in FIG. 9, the protrusion 110 </ b> A <b> 4 may be formed on the suction connection pipe 120 instead of forming the protrusion 110 </ b> A <b> 4 on the joining pipe 110. That is, the protrusion 120A3 has a protrusion 120A4 that is formed on the surface facing the protrusion 10A3 and protrudes toward the protrusion 10A3. The protrusion 120A4 is formed in an annular shape along the opposing surfaces of the protrusion 10A3 and the protrusion 120A3. Here, the protrusion 120A4 corresponds to the first protrusion.

  In addition, the aspect which forms a protrusion in both combining this Embodiment 2 and the modification of this Embodiment 2 may be sufficient. That is, the protrusion 110A4 may be formed on the joining pipe 110, and the protrusion 120A4 may be formed on the suction connection pipe 120.

  The suction connection pipe 120 is normally press-fitted into the insertion part of the cylinder 5. Here, an insulating sealing material may be provided at a contact position between the compression element connecting portion 12A1 of the suction connecting pipe 120 and the cylinder 5. Accordingly, the distortion of the cylinder 5 due to the press-fitting of the suction connection pipe 120 can be suppressed, and the welding current is not diverted, and the welding current is concentrated between the suction connection pipe 120 and the joining pipe 110. It can be performed stably.

  DESCRIPTION OF SYMBOLS 1 Airtight container, 1A trunk | drum, 1AA trunk | drum bulging part, 1B upper shell, 2 Electric element, 2A stator, 2B rotor, 3 Compression element, 4 Drive shaft, 5 Cylinder, 6 Rolling piston, 7 Upper bearing, 8 lower bearing, 9 discharge pipe, 10a copper pipe, 10 joint pipe, 10A1 reduced diameter part, 10A2 cylindrical part, 10A3 protruding part, 10A4 inner diameter corner part, 10B2 cylindrical part, 12 suction connection pipe, 12A first protrusion Part, 12A1 compression element connection part, 12A2 straight pipe part, 12A3 projecting part, 12A4 taper surface part, 12A5 taper surface part, 12A6 flat surface part, 12A7 suction pipe insertion part, 12AA cylindrical part, 14 accumulator, 14A refrigerant inflow pipe, 15 suction Tube, 15A bulge, 20 first electrode, 20A cavity, 20A1 opening, 20B plane, 21 second electrode 21A opening, 21B concave portion, 22 muscle seam, 23 insulating material, 100 a compressor, 110 joint tube, 110A4 protrusion 120 suction connection pipe, 120A3 protruding portion, 120A4 protrusion, the first weld portion P.

Claims (10)

A sealed container;
A compression element provided in the sealed container for compressing the refrigerant;
An electric motor element provided in the sealed container for driving the compression element;
An iron joining pipe, one of which is connected to the sealed container;
An iron suction connecting pipe inserted into the joining pipe, one of which is connected to the compression element;
A suction pipe, one of which is connected to the other of the suction connection pipe;
With
The suction connection pipe is
Provided at the other end, having an annular first protrusion protruding from the inner periphery to the outer periphery,
The first protrusion is
Having a tapered surface portion whose outer diameter expands from one side of the suction connection pipe to the other side;
The joint pipe is
Having an annular inner diameter corner on the inner peripheral surface of the other end,
The suction connection pipe and the joint pipe are:
A compressor having a first welded portion in which the tapered surface portion of the first projecting portion of the suction connecting pipe and the inner diameter corner portion of the other end of the joining pipe are welded . The joint pipe is
2. The compressor according to claim 1, wherein an outer diameter of the joint pipe is increased from one side to the other side. The joint pipe is
Provided at the other end, protrudes from the inner peripheral side to the outer peripheral side, and has a second protrusion provided at the compression element side from the first protrusion,
The first protrusion and the second protrusion are provided to face each other.
The first weld is
The compressor according to claim 1 or 2, wherein the compressor is provided on surfaces of the first protrusion and the second protrusion that face each other. The first protrusion is
The compressor according to claim 3, further comprising a first protrusion that is provided on a surface facing the second protrusion and protrudes toward the second protrusion. The first protrusion is
5. The compressor according to claim 4, wherein the compressor is provided in an annular shape so as to be along the opposing surfaces of the first protrusion and the second protrusion. The second protrusion is
The compression according to any one of claims 3 to 5, further comprising a second protrusion that is provided on a surface facing the first protrusion and protrudes toward the first protrusion. Machine. The second protrusion is
The compressor according to claim 6, wherein the compressor is provided in an annular shape so as to be along the opposing surfaces of the first protrusion and the second protrusion. The sealed container and the joining pipe are:
The compressor according to any one of claims 1 to 7, wherein a second welded portion in which the sealed container and the joining pipe are welded is provided. A sealed container;
A compression element provided in the sealed container for compressing the refrigerant;
An electric motor element provided in the sealed container for driving the compression element;
A method of manufacturing a compressor comprising:
A joining pipe connecting step of connecting one end of the iron joining pipe to the sealed container;
A suction connection pipe connecting step of inserting an iron suction connection pipe into the joint pipe and connecting one end of the suction connection pipe to the compression element;
An electrode installation step of installing a first electrode on the other end of the suction connection pipe and installing a second electrode on the joining pipe;
An electric current is passed through the first electrode and the second electrode, and is provided at an annular first projecting portion provided at the other end of the suction connection pipe, from one side of the suction connection pipe to the other. A resistance welding step of resistance-welding a tapered surface portion with an outer diameter extending toward the side and an annular inner diameter corner portion provided on the inner peripheral surface of the other end of the joint pipe;
A method for manufacturing a compressor, comprising: In the electrode installation step,
Installing the first electrode and the second electrode on the suction connection pipe and the joining pipe so that the first electrode is located above the second electrode;
In the resistance welding process,
Pressing the first electrode against the first protrusion,
Performing the resistance welding while holding the second electrode so that the first electrode is pressed against the first protrusion and the suction connecting pipe and the joining pipe do not move to the compression element side. The method for manufacturing a compressor according to claim 9.

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