JP2015216294A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus which includes a cooler therein and achieves improved sealing performance between a refrigerant pipe extending from the cooler and a through hole provided at a case of the electronic apparatus compared to conventional electronic apparatuses.SOLUTION: An inverter 2 includes a liquid cooling lamination unit 20, which cools electronic components. The inverter 2 includes: an upper case 6 having a through hole 4; and a pipe joint 10. The pipe joint 10 includes: a fitted part 12a in which a refrigerant pipe 23 fits; a narrow diameter part 12b having an inner diameter smaller than that of the fitted part 12a; a flange 13; and three gaskets. The flange 13 is provided at an outer periphery of a joint body. A gasket 15 is disposed between a flange surface of the flange 13 and a case side surface. A gasket 16 is disposed between an inner peripheral surface of the fitted part 12a and an outer peripheral surface of the refrigerant pipe 23. A gasket 17 is disposed in a space between a taper surface 23b of a tip of the refrigerant pipe 23 and a step 18 located between the fitted part 12a and the narrow diameter part 12b.

Description

  The present invention relates to an electronic device. In particular, the present invention relates to an electronic device including an electronic component therein and a liquid-cooled cooler that cools the electronic component.

  Electronic devices that handle large amounts of electricity generate a large amount of heat from the electronic components that are housed. Therefore, a liquid cooling type cooler for cooling electronic components may be provided inside the case of the electronic device. In order to supply the refrigerant to the cooler from the outside of the electronic device or to discharge the refrigerant that has passed through the cooler to the outside of the electronic device, it is necessary to pass a refrigerant tube through the case of the electronic device. Therefore, the case is provided with a through hole. In an electronic device mounted on an automobile, it is necessary to seal between the through hole of the case and the refrigerant pipe in order to prevent moisture from entering. In general, there is also a connecting portion between a refrigerant pipe extending from a cooler inside the case and a refrigerant pipe outside the case (a refrigerant pipe supplying refrigerant to the cooler or a refrigerant pipe discharging refrigerant from the cooler to the outside of the case). It is necessary to seal. For convenience of explanation, the refrigerant pipe extending from the cooler inside the case is called an internal refrigerant pipe, and the refrigerant pipe outside the case is called an external refrigerant pipe.

  Patent Document 1 discloses an example of an electronic device that includes a pipe joint that seals between a case side surface (side wall) and a refrigerant pipe and connects an external refrigerant pipe and an internal refrigerant pipe. Patent Document 1 targets an inverter in an electric vehicle as an electronic device. The technology is as follows. The pipe joint includes a flange, and the space between the flange surface and the case side surface around the through hole is sealed with a surface seal structure. The internal refrigerant pipe passes through the pipe joint, and the inner peripheral surface of the pipe joint and the outer peripheral face of the internal refrigerant pipe are sealed with a shaft seal structure. The connecting portion between the internal refrigerant pipe and the external refrigerant pipe is also sealed with a shaft seal structure.

  The face seal structure is a technique in which a flange is provided in a pipe joint, and a gasket or the like is disposed between the flange face perpendicular to the axis of the pipe joint and the case side surface around the through hole for sealing. With the shaft seal structure, a gasket or the like is arranged between the outer peripheral surface of the pipe joint and the inner peripheral surface of the through hole (or the outer (inner) peripheral surface of the pipe joint and the inner (outer) peripheral surface of the refrigerant pipe). This is a sealing technique. The face seal structure can allow deviation in the radial direction (in-plane direction orthogonal to the axis) of the two parts to be connected. The shaft seal structure can tolerate a deviation in the axial direction of two parts to be connected.

  Moreover, the pipe joint which improved the sealing performance is disclosed by patent document 2. FIG. The technology disclosed in Patent Document 2 relates to a pipe joint that connects a male pipe and a female pipe, and has a double seal structure of a shaft seal structure and a face seal structure.

JP 2012-064724 A Japanese Patent Application Laid-Open No. 06-0050486

  The technology disclosed in this specification also relates to an electronic device including a cooler inside, and the sealing performance between a refrigerant tube (internal refrigerant tube) extending from the cooler and a through hole provided in a case of the electronic device is conventionally increased. Providing enhanced electronic equipment.

  In the electronic device disclosed in this specification, the tip of the refrigerant pipe (internal refrigerant pipe) extending from the cooler accommodated in the case is tapered (tapered). Moreover, the pipe joint which has the following structure is employ | adopted for the through-hole of the case of an electronic device. The pipe joint includes a joint body inserted through the through hole, a flange provided on the outer periphery of the joint body, and three gaskets. The joint body includes a fitting portion having a first inner diameter into which the internal refrigerant pipe is fitted, and a narrow-diameter portion provided adjacent to the case outside of the fitting portion. The inner diameter (second inner diameter) of the narrow diameter portion is smaller than the first inner diameter and is equal to the inner diameter of the tip of the internal refrigerant pipe. The flange surface of the flange contacts the case side surface around the through hole. One gasket provided in the pipe joint is a face seal gasket disposed between the flange face and the case side face. Another gasket is a shaft seal gasket disposed between the inner peripheral surface of the fitting portion of the joint body and the outer peripheral surface of the internal refrigerant pipe. The remaining one gasket is an auxiliary gasket disposed in a space between the outer peripheral surface of the tapered shape (tapered shape) at the tip of the internal refrigerant pipe and the step between the fitting portion and the narrow diameter portion. In addition, as for the cross section of an auxiliary | assistant gasket, it is desirable that it is a triangle so that the level | step difference and the taper surface of the boundary of a fitting part and a narrow diameter part may be touched.

  Since the above electronic device seals between the internal refrigerant tube and the pipe joint with two shaft seal gaskets and auxiliary gaskets, the reliability (reliability) of sealing is increased. In other words, if the double gasket ensures the same sealing reliability as the conventional single gasket, the diameter of each gasket can be reduced compared to the single gasket. In addition, the strength around the gasket can be reduced. Therefore, the size of the joint structure can be reduced.

  Further, the electronic device has a taper tip of the internal refrigerant tube, a fitting portion and a narrower diameter portion narrower than the fitting portion inside the pipe joint, and the tip of the internal refrigerant tube is applied to the step. And an auxiliary gasket is arrange | positioned in the space where the taper surface of the front-end | tip of an internal refrigerant pipe and the level | step difference inside a pipe joint were enclosed. Since the auxiliary gasket is in contact with the tapered surface, the effect of the face seal structure is exhibited. That is, even when a radial shift occurs between the internal refrigerant pipe and the pipe joint, the taper surface and the auxiliary gasket are kept in close contact with each other, and the sealability between the pipe joint and the internal refrigerant pipe is maintained. Further, since the tip of the internal refrigerant pipe is tapered, the internal refrigerant pipe can be easily inserted into the pipe joint. Furthermore, since the inner diameter of the tip of the internal refrigerant pipe is the same as the inner diameter of the narrow diameter portion of the pipe joint, the refrigerant flows smoothly. That is, the loss of the refrigerant flow between the internal refrigerant pipe and the pipe joint is small.

  In this specification, a groove provided in the case and forming a “hole” when the cover is attached to the case is also treated as a through hole for convenience. The pipe joint is a component that connects the external refrigerant pipe and the internal refrigerant pipe on the side surface of the case, but the structure of the pipe joint may be inseparably provided at the tip of the external refrigerant pipe. .

  The technology disclosed in the present specification relates to an electronic device in which a through hole is provided in a case, a pipe joint is fitted, and a refrigerant pipe (internal refrigerant pipe) extending from an internal cooler is connected to the pipe joint. The present specification provides an electronic apparatus with improved reliability of sealing between a pipe joint and an internal refrigerant pipe. Details and further improvements of the technology disclosed in this specification will be described in the following “DETAILED DESCRIPTION”.

It is a disassembled perspective view of the electronic device (inverter) of an Example. It is a perspective view of an inverter (without a cover). It is sectional drawing in the III-III line of FIG. FIG. 4 is an enlarged view of a range surrounded by a broken line IV in FIG. 3. FIG. 5 is a cross-sectional view before inserting a refrigerant pipe in the same cross section as FIG. 4.

  An electronic apparatus according to an embodiment will be described with reference to the drawings. The electronic device according to the embodiment is an inverter 2 mounted on an electric vehicle. The inverter 2 converts the DC power of the battery into AC power and supplies it to the traveling motor. FIG. 1 shows an exploded perspective view of the inverter 2. FIG. 2 is a perspective view of the inverter 2. FIG. 3 is a sectional view taken along line III-III in FIG. Note that the illustration of the cover 59 of the inverter 2 shown in FIG. 3 is omitted in FIGS. Moreover, in FIG. 3, the structure around the pipe joint 10 is illustrated in a simplified manner. Details of the structure around the pipe joint 10 are shown in FIG.

  The inverter 2 includes a voltage converter circuit that boosts the voltage of the battery and an inverter circuit that converts the boosted DC power into AC power. The inverter 2 includes, as hardware, a plurality of power cards 22, a plurality of cooling plates 21, a stacked unit 20, a reactor 52, a capacitor 51, a circuit board (not shown), and the like. In FIG. 1, reference numeral “22” is attached to only one power card, and reference numerals are omitted for other power cards having the same shape. Similarly, in FIG. 1, the reference numeral “21” is given to only one cooling plate, and the reference numerals are omitted for other cooling plates having the same shape. In FIG. 2, the reference numerals of all power cards and cooling plates included in the stacked unit 20 are omitted. In addition, the inverter 2 includes another cooler 8 (described later).

  The inverter 2 has two independent cases (upper case 6 and lower case 7). The upper case 6 accommodates the above-described device group such as the laminated unit 20 and the reactor 52. The lower case 7 is the cooler 8 itself. The inverter 2 includes two types of coolers, and one is a cooler 8 that cools the reactor 52 and the condenser 51. The other is a stacked unit 20 in which power cards 22 and cooling plates 21 are alternately stacked, and cools the power cards 22 in a concentrated manner. The cooler 8 is fixed to the bottom surface of the upper case 6.

  The power card 22 is a package in which switching elements of a voltage converter circuit and an inverter circuit are molded with resin. The stacked unit 20 is a device in which power cards 22 and cooling plates 21 are alternately stacked. A transistor such as an IGBT is used as the switching element.

  The circuit board generates a drive signal to be supplied to the switching element. Although the circuit board is disposed above the laminated unit 20, its illustration is omitted. The power card 22, the capacitor 51, and the reactor 52 are electrically connected to each other by a metal bus bar, but the illustration thereof is omitted.

  The cooling plate 21 of the laminated unit 20 is a flat plate type cooler through which a refrigerant passes. The power card 22 is sandwiched between the cooling plates 21 on both sides, and the switching elements in the power card are efficiently cooled.

  The laminated unit 20 is further laminated with an insulating plate 55 and a leaf spring 54 at one end in the laminating direction. The laminated unit 20 is supported so as to be sandwiched between the inner surface of the upper case 6 and the support column 53. The laminated unit 20 is supported by the upper case 6 by the leaf spring 54 while applying a load in the laminating direction. Due to the load of the leaf spring 54, the adhesiveness between the alternately stacked cooling plates 21 and the power card 22 is increased, and the heat transfer efficiency from the power card 22 to the cooling plate 21 is improved.

  The inside of the cooling plate 21 is a cavity through which the refrigerant passes. Through holes are provided in both ends of the cooling plate in the longitudinal direction as viewed from the stacking direction (both ends in the Y-axis direction in the figure and both sides of the power card 22). The through holes of adjacent cooling plates 21 are connected by a connecting pipe 25. And two refrigerant pipes 23 and 24 extend from the through hole of the cooling plate 21 at the end in the stacking direction. When the stacked unit 20 is housed in the upper case 6, the refrigerant tubes 23 and 24 reach the through holes 4 and 56 of the case provided on the side surface (side wall) of the upper case 6.

  A supply pipe 61 for supplying refrigerant from the outside is connected to the through hole 56 of the case from the outside of the upper case 6. The supply pipe 61 and the refrigerant pipe 24 communicate with each other through a through hole 56 on the side surface of the case.

  The other refrigerant pipe 23 of the stacked unit 20 reaches the other through hole 4 at the tip. A pipe joint 10 is fitted in the through hole 4, and the refrigerant pipe 23 is connected to the pipe joint 10. The upper opening of the external connection pipe 3 is coupled to the outside of the pipe joint 10 (the case outside). The external connection pipe 3 connects the refrigerant pipe 23 of the laminated unit 20 and the cooler 8 of the lower case 7. The lower opening of the external connection pipe 3 is connected to the refrigerant supply port 5 provided in the lower case 7. A flange 3 a is provided around the lower opening of the external connection pipe 3. The flange 3 a is coupled to the side surface around the refrigerant supply port 5 with a bolt. Illustration of the bolt is omitted. The lower case 7 is provided with another opening (refrigerant discharge port 57), to which a discharge pipe 62 is connected.

  The structure of the pipe joint 10 will be described in detail later. In addition, between the supply pipe 61 and the through hole 56 of the case, between the through hole 56 of the case and the refrigerant pipe 24, between the discharge pipe 62 and the refrigerant discharge port 57, and between the external connection pipe 3 and the refrigerant supply port 5. Although each has a specific sealing structure, in this embodiment, since the focus is on the sealing structure by the pipe joint 10, the illustration and description of the sealing structure at other locations are omitted.

  The flow of the refrigerant will be described. The refrigerant is a liquid, for example, water or LLC (Long Life Coolant). The stacked unit 20 and the cooler 8 are liquid-cooled coolers.

  The refrigerant is supplied to the inverter 2 from the outside through the supply pipe 61. The refrigerant flows into the laminated unit 20 through the through hole 56 of the case and the one refrigerant pipe 24. The refrigerant flowing in from the refrigerant pipe 24 is distributed to all the cooling plates 21 through one connection pipe 25 connected to the cooling plate 21. The refrigerant flows in the cooling plate 21 in the longitudinal direction (Y-axis direction in the figure), and cools the power card 22 in contact with the cooling plate 21. The refrigerant that has absorbed the heat of the power card 22 flows to the refrigerant pipe 23 through the other connection pipe 25 connected to the cooling plate 21. The refrigerant is further discharged from the upper case 6 through the refrigerant pipe 23 and the through hole 4 of the case.

  Thereafter, the refrigerant moves to the lower case 7 (that is, the cooler 8) through the external connection pipe 3. Inside the lower case 7, a refrigerant flow path 9 (see FIG. 3) is provided at a position corresponding to a position directly below the reactor 52 and the condenser 51 installed in the upper case 6. While the refrigerant passes through the flow path 9, the heat of the reactor 52 and the condenser 51 is absorbed. The refrigerant is finally discharged out of the inverter 2 through the discharge pipe 62 connected to the refrigerant discharge port 57. A cooling system including a radiator that cools the refrigerant that has absorbed heat and a pump that circulates the refrigerant is provided outside the inverter 2. The refrigerant that has absorbed the heat of the electronic components (such as a switching element and a reactor) in the inverter 2 is cooled by the radiator and sent to the inverter 2 again.

  With reference to FIG. 4 and FIG. 5, the connection structure using the pipe joint 10 is demonstrated. 4 is an enlarged cross-sectional view of a broken line area IV in FIG. FIG. 5 shows the same cross section as FIG. 4 but before the refrigerant pipe 23 is inserted into the pipe joint 10. The pipe joint 10 includes a joint main body 12, a flange 13, and three gaskets 15, 16, and 17. The joint body 12 and the flange 13 are made of metal or resin. The three gaskets 15, 16, and 17 are made of a flexible material (for example, silicon rubber). The joint body 12 is divided into a cylindrical fitting portion 12a and a cylindrical narrow-diameter portion 12b according to the function. The narrow diameter portion 12b is provided adjacent to the case outer side of the fitting portion 12a. A flange 13 is provided on the outer periphery of the joint body at approximately the center in the axial direction of the joint body 12. In the following description, the upper case 6 may be simply referred to as “case 6” in order to simplify the description.

  The joint body 12 is inserted through the through hole 4 until the flange surface 13a of the flange 13 contacts the case side surface 6a around the through hole 4. The flange surface 13 a is a surface facing the case side surface 6 a of the flange 13. A gasket groove 14 b is provided on the flange surface 13 a so as to surround the joint body 12. A face seal gasket 15 is disposed in the gasket groove 14b. The face seal gasket 15 has a ring shape and surrounds the through hole 4. Although not shown, the flange 13 is fixed to the upper case 6 with bolts. At this time, the face seal gasket 15 is clamped between the case side surface 6a and the flange surface 13a, and the gap between the flange 13 and the upper case 6 is sealed. This sealing structure is a face seal structure. A gap G is secured between the inner peripheral surface of the through hole 4 and the outer peripheral surface of the joint body 12. This gap G allows the pipe joint 10 to move in the radial direction (in the YZ plane in the figure) before being fixed with bolts. The gap G absorbs the radial displacement between the pipe joint 10 and the refrigerant pipe 23.

  A portion of the joint body 12 closer to the inner side of the case corresponds to the fitting portion 12a, and a portion closer to the outer side of the case corresponds to the narrow-diameter portion 12b. As shown in FIG. 5, the inner diameter of the fitting portion 12a is represented by the symbol D1, and the inner diameter of the narrow-diameter portion 12b is represented by the symbol D2. Note that the inner diameter of the tip of the refrigerant pipe 23 is represented by the symbol D3. The fitting part 12a is a part into which the refrigerant pipe 23 is fitted. Therefore, the inner diameter D1 of the fitting portion 12a is substantially equal to the outer diameter of the refrigerant pipe 23. A gasket groove 14a is provided on the inner peripheral surface of the fitting portion 12a so as to go around the inner periphery. A shaft seal gasket 16 is disposed in the gasket groove 14a. The shaft seal gasket 16 has a ring shape and surrounds the refrigerant pipe 23. When the refrigerant tube 23 is inserted into the fitting portion 12a, the shaft seal gasket 16 is narrowed between the inner peripheral surface of the fitting portion 12a and the outer peripheral surface of the refrigerant tube 23, and the fitting portion 12a and the refrigerant tube 23 are connected to each other. The gap is sealed. As will be described later, the gap between the joint body 12 and the refrigerant pipe 23 is also sealed by the auxiliary gasket 17. That is, the joint body 12 and the refrigerant pipe 23 are double-sealed by the shaft seal gasket 16 and the auxiliary gasket 17.

  The inner diameter D2 of the narrow diameter portion 12b is smaller than the inner diameter D1 of the fitting portion 12a. Therefore, a step 18 is formed at the boundary between the narrow diameter portion 12b and the fitting portion 12a. The refrigerant tube 23 is inserted until the tip 23a reaches the step 18. Note that the tip 23a of the refrigerant pipe 23 is tapered. The auxiliary gasket 17 is disposed so as to be in contact with the inner periphery of the fitting portion 12 a and the step 18. The auxiliary gasket 17 has a ring shape and surrounds the tip of the refrigerant pipe 23. The auxiliary gasket 17 has a triangular cross section. When the refrigerant pipe 23 is inserted to the step 18, a space having a triangular cross section is formed by the step 18, the inner peripheral surface of the fitting portion 12 a, and the tapered surface 23 b at the tip of the refrigerant pipe 23. The auxiliary gasket 17 having a triangular cross section fits into the space. When the refrigerant pipe 23 is inserted up to the step 18, the auxiliary gasket 17 is narrowed by the step 18, the inner peripheral surface of the fitting portion 12a, and the tapered surface 23b at the tip of the refrigerant pipe 23, so that the inside of the fitting portion 12a The space between the peripheral surface and the tapered surface 23b (refrigerant pipe 23) is sealed. In FIGS. 4 and 5, a gap is drawn around each gasket so that the structure can be easily understood. However, each gasket is actually in close contact with the members on both sides and is compressed / compressed. Seal between the members.

  The inner diameter D2 of the narrow diameter portion 12b is substantially the same as the inner diameter D3 of the tip of the refrigerant tube 23. Further, the external connection pipe 3 is press-fitted into the outer periphery of the narrow diameter portion 12b. Since the narrow-diameter portion 12b (pipe joint 10) and the external connection pipe 3 are connected by press-fitting, sealing between them is also ensured. A shaft seal gasket may be disposed between the narrow diameter portion 12b and the external connection pipe 3.

  The advantage of the connection structure of the pipe joint 10 and the refrigerant pipe 23 described above will be described. First, the space between the refrigerant pipe 23 and the pipe joint 10 is double sealed with the shaft seal gasket 16 and the auxiliary gasket 17. Therefore, the reliability of sealing between the refrigerant pipe 23 and the pipe joint 10 is increased. When the sealing performance between the refrigerant pipe 23 and the pipe joint 10 may be the same as that of the conventional single gasket, the sealing performance of the shaft seal gasket 16 and the auxiliary gasket 17 can be lowered. This leads to a reduction in the cross-sectional areas of the shaft seal gasket 16 and the auxiliary gasket 17 and a reduction in the strength of parts on both sides of the gasket. This means that reducing the strength contributes to simplification of the structure or miniaturization.

  On the other hand, the auxiliary gasket 17 has a triangular cross section so as to be in contact with the two surfaces constituting the step 18 at the boundary between the fitting portion 12a and the narrow diameter portion 12b and the tapered surface 23b at the tip of the refrigerant tube 23. This structure improves the sealing performance between the tapered surface 23b and the inner peripheral surface of the fitting portion 12a.

  Moreover, that the front-end | tip of the refrigerant | coolant pipe | tube 23 is a tapered shape makes it easy to insert the refrigerant | coolant pipe | tube 23 in the fitting part 12a. Furthermore, since the inner diameter D3 of the tip of the refrigerant tube 23 and the inner diameter D2 of the narrow diameter portion 12b are substantially equal, the refrigerant flows smoothly.

  In the inverter (electronic device) of the embodiment, the external connection pipe 3 is fitted to the outer peripheral surface of the joint body 12 of the pipe joint 10. In the technology of the embodiment, a radial shift between the pipe joint 10 and the case is allowed, and an axial shift between the pipe joint 10 and the refrigerant pipe 23 is allowed. Therefore, the pipe joint 10 and the external connection pipe 3 may be rigidly joined without allowing deviation. That is, the pipe joint 10 is a component that connects the external connection pipe 3 outside the case and the refrigerant pipe 23 inside the case, but the pipe joint 10 may be configured inseparably from the external connection pipe 3. In other words, an aspect in which the structure of the pipe joint 10 is provided at the tip of the external connection pipe 3 is also included in the “pipe joint for connecting the external refrigerant pipe and the internal refrigerant pipe”.

  In the examples, the connection structure between the refrigerant pipe 23 and the pipe joint 10 was described, and the structure of other connection parts was omitted from the illustration and description. For example, a pipe joint may be disposed between the refrigerant pipe 24 and the through hole 56. In addition, the technology disclosed in this specification can be applied not only to an inverter of an electric vehicle but also to other electronic devices. Moreover, as for the pipe joint 10 of an Example, the flange 13 is contact | abutting to the side surface of a case outer side. The pipe joint may be attached to the case so that its flange abuts the side surface inside the case.

  Points to be noted regarding the technology described in the embodiments will be described. The power card 22 is an example of an electronic component housed in a case. The laminated unit 20 is an example of a cooler inside the case. The refrigerant pipe 23 corresponds to an example of an internal refrigerant pipe extending from a cooler inside the case. The “upper case 6” corresponds to an example of a “case”. The external connection pipe 3 corresponds to an example of an external refrigerant pipe.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2: Inverter (electronic equipment)
3: External connection pipe 3a: Flange 4, 5: Through hole 6: Upper case 6a: Side face 7: Lower case 8: Cooler 9: Channel 10: Pipe joint 12: Fitting body 12a: Fitting portion 12b: Narrow Diameter 13: Flange 13a: Flange surfaces 14a, 14b: Gasket groove 15: Face seal gasket 16: Shaft seal gasket 17: Auxiliary gasket 18: Step 20: Laminate unit (cooler)
21: Cooling plate 22: Power card 23, 24: Refrigerant pipe 23a: Refrigerant pipe tip 23b: Tapered surface 25: Connection pipe 56, 57: Through hole 61: Supply pipe 62: Discharge pipe

Claims (1)

It is an electronic device that includes an electronic component inside and a liquid-cooled cooler that cools the electronic component.
A case having a through hole;
An internal refrigerant pipe extending from the cooler and having a tapered tip;
A pipe joint that fits into the through hole and connects the internal refrigerant pipe and an external refrigerant pipe outside the case;
With
The pipe joint is
A joint body that is inserted through the through-hole, and has a first inner diameter fitting portion into which the internal refrigerant pipe is fitted, and is provided adjacent to the fitting portion, and the inner diameter is larger than the first inner diameter. A joint body having a narrow-diameter portion having a second inner diameter that is small and equal to the inner diameter of the tip of the internal refrigerant tube;
A flange that is provided on the outer periphery of the joint body, and abuts against a side surface of the case around the through hole;
A face seal gasket disposed between the flange surface of the flange and the case side surface;
A shaft seal gasket disposed between the inner peripheral surface of the fitting portion and the outer peripheral surface of the internal refrigerant pipe;
An auxiliary gasket disposed in a space between the tapered outer peripheral surface of the tip of the internal refrigerant pipe and the step between the fitting portion and the narrow-diameter portion;
An electronic device comprising:

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