JPH08240395A - Heat exchanger - Google Patents

Abstract

PURPOSE: To obtain the diameter of an exit and inlet pipe in the size in which no passage resistance occurs even if a tank is reduced in size with a simple structure. CONSTITUTION: Pipe inserting parts 25, 26 with bottoms are formed on the extension of the partition plate 19 of a tank 11 which is partitioned by the plate 19 to an inlet side 20 and an outlet side 21 to communicate with an inlet pipe 9 and an outlet pipe 10. The parts 25, 26 are gradually reduced at the inner peripheries from the openings in contact with the ends of the pipes 9, 10, and provided with openings 30 opened at the inlet side 20 or the outlet side 21 at the bottom 27 from the contact sites of the pipes 9, 10. The plate 19 is formed with a recess 22 which can be brought into contact with the parts 25, 26 without gap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used as, for example, a heater core in an air conditioner for vehicles, in which both inlet and outlet pipes are connected to a tank on one side.

[0002]

2. Description of the Related Art A conventional heat exchanger of a type in which an inlet side and an outlet side of a tank are partitioned in the stacking direction and both the inlet and outlet pipes are connected to one tank
The one shown in FIG. 2 of Japanese Utility Model Laid-Open No. 63-154962 is already known.

An outline of such a heat exchanger is as follows: Tank 3
Is an elongated tank-shaped inlet-side tank plate and an outlet-side tank plate that are open at the bottom side, and the openings of the flat tubes 1 that are closed in multiple layers and close the openings of the inlet-side tank plate and the outlet-side tank plate. And a tube plate 4 into which the side is inserted.

The inlet pipe 5 is provided on the upper surface of the inlet side tank plate between the side walls of the inlet side tank plate in the ventilation direction, and the outlet pipe 6 is located on the upper surface of the outlet side tank plate in the ventilation direction side wall of the outlet tank plate. It is provided between them.

[0005]

On the other hand, with the recent demand for miniaturization of vehicle air-conditioning systems, miniaturization of heat exchangers has also been demanded.
In order to realize the miniaturization of this heat exchanger, it is conceivable to reduce the width of the tank in the ventilation direction, but as mentioned above, the inlet and outlet pipes of the heat exchanger should be installed on the inlet side and the outlet side of the tank plate on the inlet side. If it is provided between the side walls of the tank plate or the outlet side tank plate in the ventilation direction, the diameter of the inlet / outlet pipe is inevitably reduced if the width of the tank in the ventilation direction is reduced.

When the diameter of the inlet / outlet pipe is reduced, the passage resistance is increased and the performance of the heat exchanger is deteriorated.

Therefore, as shown in FIG. 1 of Japanese Patent Laid-Open No. 4-353397, there is provided a heat exchanger which secures the diameter of the inlet / outlet pipe so that the passage resistance does not increase even if the width of the tank in the ventilation direction is reduced. It is considered.

This heat exchanger comprises a front tank section 28 defined by partition walls extending in the stacking direction, a right tank section 40 defined by partition walls extending in the ventilation direction in the rear tank section tanks 28, 29, and a left tank section. 41 is added to the front tank portion 28 and the right tank portion 40, and the rear tank portion 29 and the left tank portion 41 are connected to each other by providing openings at their contact surfaces, and the right tank portions 4 are connected to each other.
0, on the upper surface of the left tank part 41,
I am thinking of connecting four. As a result, the diameters of the inlet and outlet pipes 9 and 10 can be ensured by the widths of the maximum right side tank portion 40 and the left side tank portion 41 in the substantially ventilation direction, so that the above object can be achieved.

However, the structure of the tank of the heat exchanger has the disadvantages that the structure of the tank becomes too complicated and the manufacturing cost becomes high.

In view of the above problems, in the present invention, in a heat exchanger in which both inlet and outlet pipes are connected to a tank on one side, the inlet and outlet are simple in structure even if the width in the ventilation direction of the tank is reduced. An object of the present invention is to provide a heat exchanger that can secure the diameter of a pipe to the extent that the passage resistance does not increase.

[0011]

[Means for Solving the Problems] The heat exchanger,
A tank whose interior is divided into an inlet side and an outlet side by a partition wall extending in the stacking direction, an inlet / outlet pipe that communicates with the inlet side or the outlet side of the tank, and an inlet side and an outlet side of the tank that communicate with each other. In a heat exchanger including a plurality of tube elements laminated via fins, a bottomed pipe insertion part to which the inlet / outlet pipe is connected is provided on a partition wall extension of the tank, and the pipe insertion part The partition wall is abutted with no space, the inner peripheral surface of the pipe insertion part is gradually narrowed from the opening, and the tip of the inlet / outlet pipe is abutted on the inner peripheral surface, and the inlet / outlet pipe is connected to the pipe insertion part. An opening that opens to the inlet side or the outlet side is provided on the bottom side with respect to the contacting portion with (1).

Here, a notch is provided at the bottom of the pipe insertion part, and the partition wall is fitted into the notch so as to project into the pipe insertion part and the tip of the inlet / outlet pipe inserted into the pipe insertion part. You may make it form the protrusion part which contacts with (Claim 2).

The heat exchanger has a tank whose inside is divided into an inlet side and an outlet side by a partition wall extending in the stacking direction, an inlet / outlet pipe communicating with the inlet side or the outlet side of the tank, and the tank. In a heat exchanger including a tube element that connects the inlet side and the outlet side and is laminated in a plurality of stages via fins, an insertion hole into which the inlet and outlet pipes are inserted and joined is formed on the partition wall extension of the tank. The partition wall may be provided with a pedestal that is bent at a portion facing the insertion hole toward the inlet side or the outlet side and is in contact with the tip of the inlet / outlet pipe (claim 3).

In this case, since it is necessary to increase the opening area of the inlet / outlet pipe, it is desirable to axially cut out the tip of the inlet / outlet pipe protruding from the pedestal in the range of being inserted into the tank (claim 4). .

[0015]

Therefore, according to the heat exchanger of claim 1,
Since the inlet / outlet pipe is attached to the pipe insertion portion provided on one of the inlet side and the outlet side of the tank and provided on the extension of the partition wall of the tank, the heat exchange medium flowing from the inlet pipe is It flows into the inlet side of the tank through the opening of the insertion portion, passes through the tube element, reaches the outlet side of the tank, and flows out of the outlet pipe through the opening of the pipe insertion portion. In this way, by adopting a configuration in which the inlet / outlet pipe is attached to the pipe insertion portion provided on the extension of the partition wall of the tank, it is possible to maximize the size of the diameter substantially the same as the width in the ventilation direction of the tank.

Further, according to the heat exchanger of the second aspect, when the inlet / outlet pipe is inserted into the pipe insertion portion, in addition to the inner peripheral surface of the pipe insertion portion, the projection extending from the partition wall also has the tip end portion of the inlet / outlet pipe. Since the abutment is made in contact with each other, the entrance / exit pipe can be easily positioned.

Also, according to the heat exchanger of the third aspect, the inlet / outlet pipe is inserted into the insertion hole provided on the extension of the partition wall of the tank of the heat exchanger, and the tip end is brought into contact with the pedestal of the partition wall. Because of the structure, it is possible to maximize the diameter of the tank in the ventilation direction.

Further, as described in claim 4, the opening area of the heat exchange medium is increased by notching the part of the tip of the inlet / outlet pipe protruding from the pedestal, so that the flow rate of the heat exchanger is increased. Therefore, the passage resistance of the heat exchanger can be reduced.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

One embodiment of the heat exchanger is shown in FIGS. 1 to 4, and the heat exchanger 1 is of a one-sided tank type used as a heater core in a vehicle air conditioner, for example, and a tube element 2 is used. And corrugated fins 3 are alternately laminated in a plurality of stages, and a tank 11 provided with an inlet pipe 9 and an outlet pipe 10 is joined to one end of the laminated tube element 2 so as to be basically configured. ing.

Of these, the tube element 2 has a substantially rectangular shape although its entire structure is not shown, and includes two forming plates formed of an aluminum alloy whose main material is aluminum clad with a brazing material. It is constructed by joining together in the middle.

Each tube element 2 is shown in FIG.
As shown in FIG. 3, a heat exchange medium passage 2a formed in a U shape by a central partition wall 2c is provided inside, and a brazing margin portion 2b is brazed when the tube elements 2 are joined in the middle. Is provided on the periphery. Further, projecting plates 2d for preventing the fins 3 from coming off extend to both sides in the stacking direction on the lower side of the tube element 2, and on the front end side,
As shown in FIG. 2, it has a connecting portion 5 to be inserted into an insertion hole 15 described below, and the connecting portion 5 is formed with outflow inlets 6 and 6 that open into the tank 11.

As shown in FIGS. 2 and 3, in particular, the tank 11 has a substantially flat plate-shaped end plate 12 having a plurality of locking pieces 12a provided upright on the edge portion thereof, and a deep drawing fit into the end plate 12. The tank member 16 and a partition wall 19 that divides the inside of the tank 11 into an inlet side 20 and an outlet side 21.
It is basically composed of and.

Of these, the end plate 12 is shown in FIG.
As shown in FIG. 5, a plurality of insertion holes 15 for inserting the connection portions 5 of the tube element 2 are provided in parallel in the stacking direction. The insertion hole 15 is formed by burring, and the central portion and both end portions are the partition walls 2 of the tube element.
It has a narrowed shape according to the shapes of c and the brazing allowance portion 2b.

The partition wall 19 extends along the center of the tube element of the tank 11 in the stacking direction, and the deep drawing tank member 1 is formed.
It is a plate-shaped object that is placed so as to contact the inside of 3.
As a result, the tank 11 can be divided into the inlet side 20 and the outlet side 21 in a substantially equal size. Further, on the tube element side of the partition wall 19, as shown in FIG. 4, a plurality of notches 19a that mesh with the partition walls 2c of the tube element 2 are formed. Further, on the side opposite to the side where the partition wall 2c is formed, recesses 22 and 22 are formed which come into contact with the outer surfaces of the side portion 28 and the bottom portion 27 of the pipe insertion portion 25 described below without a gap.

The deep-drawing tank member 13 is a box-shaped member having an opening on the end plate 12 side, and has a shape in which its side surface extends from the inlet / outlet pipe side to the end plate side. Then, on the extension of the partition wall 19 of the tank 11, as shown in FIG. 3 and FIG.
A pipe insertion portion 25 for attaching the tank 10 to the tank 11,
26 is formed.

The one pipe insertion portion 25 is shown in FIGS.
As shown in a, at the portion that abuts the partition wall 19 and at the tank outlet side 21 of the partition wall 19, a side that has a horizontal bottom portion 27 and an inner peripheral surface that is gradually narrowed from the tank opening side and inclined. Section 28 and is not in communication with the tank outlet side 10. Further, the pipe insertion portion 25 has an opening 30 on the side of the bottom portion 27 that is closer to the partition wall 19 of the side portion 28, and the opening 30 communicates with the tank inlet side 20.

However, when the inlet pipe 9 is connected to the pipe insertion portion 25, the tip end portion of the inlet pipe 9 contacts the side portion 28 as shown by the imaginary line in FIG. 4a.
The opening 30 maintains an open state, and the side portion 28 and the bottom portion 2 are provided between the tank outlet side 21 and the inlet pipe 9.
It is closed at 7. Therefore, from the inlet pipe 9 to the opening 3
The heat exchange medium flows into the tank inlet side 20 only through 0, but the heat exchange medium does not flow from the inlet pipe 9 into the tank outlet side 21.

The other pipe insertion portion 26 is shown in FIGS.
As shown in b, it has a symmetrical shape with the pipe insertion portion 25. That is, a portion that contacts the partition wall 19 and a tank inlet side 20 with respect to the partition wall 19 are provided with a horizontal bottom portion 27 and a side portion 28 having an inner peripheral surface that is gradually narrowed from the tank opening side and inclined. There is no communication with the tank inlet side. Also, the partition wall 19
An opening 30 is provided on the tank outlet side 20 with respect to the portion abutting with, and on the bottom 27 side with respect to the portion of the side portion 28 abutting on the partition wall 19, and the opening 30 communicates with the tank outlet 21. It is supposed to do.

However, when the outlet pipe 10 is connected to the pipe insertion portion 25, the tip end portion of the outlet pipe 10 abuts the side portion 28 as shown by the imaginary line in FIG. The open state is maintained, and the tank inlet side 20 and the outlet pipe 10 are closed by a side portion 28 and a bottom portion 27. Therefore, the heat exchange medium flows from the tank outlet side 21 through the opening 30 to the outlet pipe 10, but the heat exchange medium does not flow from the outlet pipe 10 to the tank inlet side 20.

Next, a process of assembling the heat exchanger having the above structure will be briefly described with reference to FIGS.

First, the partition wall 19 is attached to the end plate 12
Then, the deep drawing tank member 13 is fitted into the end plate 12. Next, the tube element 2 is laminated in a plurality of stages with the fins 3 interposed therebetween, and the connecting portion 5 of the tube element 2 is inserted into the insertion hole 15 of the end plate 12.
And the notch 19a of the partition wall 19 and the partition wall 2c.
Mesh with. Further, the inlet pipe 9 and the outlet pipe 10 are connected to the pipe insertion portions 25 and 26 of the deep drawing tank member 13, respectively. Then, although not shown, the heat exchanger assembled by the above procedure is placed in a furnace and brazed by a so-called heating brazing method to complete the process. However, the inlet pipe 9 and the outlet pipe 10 may be connected to the pipe insertion portions 25 and 26 by torch brazing independently of the furnace brazing.

5 to 7, there is shown a modified example of the heat exchanger shown as the one embodiment, and the heat exchanger has a partition wall 1 at the bottom 27 of the pipe insertion portions 25 and 26.
Notches 31 and 31 are formed at a position where 9 abuts, with a width substantially the same as the inner diameter of the inlet and outlet pipes 9 and 10. The deepest portion 22a of the recess 22 of the partition wall 19
From the protrusions 23, 23 with the same width as the notches 31, 31
And the extension dimension of the protrusion 23 is inserted into the pipe insertion portions 25 and 26.
It is dimensioned so as to come into contact with the tip portion of 0.

As a result, the protrusions 23, 23 are notched 3
Since the fitting walls 1 and 31 are fitted, the partition wall 19 and the deep-drawing tank member 13 can be more firmly assembled. Also,
Since the tips of the inlet / outlet pipes 9 and 10 are brought into contact with the side portions 28 and the protrusions 23 and 23 for positioning, the positioning can be further facilitated.

In the heat exchanger shown in FIGS. 5 to 7, the partition wall 19 is provided with the projecting portion 23 as described above, and the notches 31 are formed in the bottom portions 27 of the pipe insertion portions 25, 26. The configuration is the same, except that the is formed. Therefore, the same reference numerals are given to the same configurations, and the description thereof will be omitted.

Another embodiment of the heat exchanger is shown in FIGS. 8 to 10. The heat exchanger 1 is of a one-sided tank type used as a heater core in, for example, a vehicle air conditioner, and has a tube element 2. And the corrugated fins 3 are alternately laminated in a plurality of stages, and the tank 11 provided with the inlet pipe 9 and the outlet pipe 10 is joined to one end side of the laminated tube element 2,
The basic configuration is the same as that of the previous embodiment. The configurations of the tube element 3, the fin 4, and the end plate 12 of the tank 11 are the same as in the previous embodiment.

However, the deep drawing tank member 1 of the tank 11
3. The constructions of the partition wall 19 and the entrance / exit pipes 9 and 10 are different from those of the previous embodiment, and therefore only those portions will be described below.

As shown in FIG. 8, the deep-drawing tank member 13 has the same shape as that shown in the previous embodiment, but the inlet pipe 9 described below is provided on the partition wall extension of the tank 11. ', Insertion holes 33 and 34 for connecting the outlet pipe 10 are provided.

The partition wall 19 'has the insertion holes 33, 34.
The pedestal 35 in which a part of the partition wall 19 ′ is bent to the tank outlet side 21 and the pedestal 36 in which a part of the partition wall 19 ′ is bent to the tank inlet side 20 are provided. The width of the pedestals 35 and 36 in the ventilation direction is larger than the outer radius of the inlet / outlet pipes 9 ′ and 10 ′.

The inlet pipe 9'can flow the heat exchange medium into the tank inlet side 20 from the tip portion protruding from the pedestal 35 without any processing on the tip portion, but the opening area of the inlet pipe 9'is As shown in FIG. 9a to increase the size of the tank, when it comes into contact with the pedestal 35 formed on the partition wall 19 ', the portion protruding from the pedestal 35 is not used.
You may have the notch part 40 cut out in the axial direction in the range inserted.

However, when the inlet pipe 9'is inserted through the insertion hole 33 and abuts on the pedestal 35, the inlet pipe 9'protrudes from the pedestal 35 as shown by the phantom line in FIG. 9a. The tank outlet side 21 and the inlet pipe 9 ′ are closed by the pedestal 35 and the side portion of the inlet pipe 9 ′ while communicating with the tank inlet side 20 via the section and the notch 40. Therefore, the cutout 40 from the inlet pipe 9 '
The heat exchange medium flows into the tank inlet side 20 through the
The heat exchange medium does not flow out from the inlet pipe 9 ′ to the tank outlet side 21.

The other outlet pipe 10 'is symmetrical with the inlet pipe 9', as shown in FIG. 9b. That is, the heat exchange medium can flow into the tank inlet side 20 from the tip portion protruding from the pedestal 35 without any processing being applied to the tip portion thereof, but as shown in FIG. Partition wall 19 ', as shown
When the pedestal 36 formed on the
You may have the notch part 40 cut out in the axial direction in the range which the part protruding from 6 is inserted in the tank 11.

However, the outlet pipe 10 'is inserted into the insertion hole 33.
When it is inserted from the base 36 and comes into contact with the pedestal 36, the outlet pipe 10 ′ is connected to the tank outlet side 21 through the notch 40 and the tip portion protruding from the pedestal 36, as shown by the imaginary line in FIG. 9b. The tank inlet side 20 and the outlet pipe 10 ′ are in communication with the side portion of the outlet pipe 10 ′ and the pedestal 3.
It is closed at 6. Therefore, the heat exchange medium flows out from the tank outlet side 21 through the notch 40 to the outlet pipe 10 ', but the heat exchange medium does not flow out from the tank inlet side 20 to the outlet pipe 10'.

Next, a process of assembling the heat exchanger having the above structure will be briefly described with reference to FIGS. 9 and 10.

First, the partition wall 19 'is attached to the end plate 1
2 and then the deep drawing tank member 13 is fitted into the end plate 12. Next, the tube element 2 is laminated in a plurality of stages with the fins 3 interposed therebetween, the connecting portion 5 of the tube element 2 is inserted into the insertion hole 15 of the end plate 12, and the notch 19a of the partition wall 19 'is formed. Engage with the partition wall 2c. Further, the inlet / outlet pipes 9 ', 10' are inserted from the insertion holes 33, 34 of the deep-drawing tank member 13 until they come into contact with the bases 35, 36, respectively. At this time, the inlet / outlet pipes 9 ′, 10 are arranged so that the cutout portion 40 of the inlet pipe 9 ′ faces the inlet side 20 of the tank and the notch portion 40 of the outlet pipe 9 ′ faces the outlet side 21 of the tank. 'Must be installed. Then, although not shown, the heat exchanger assembled by the above procedure is put into a furnace, and brazing is performed by a so-called heat brazing method to complete the process. Since the inlet / outlet pipes 9 ′ and 10 ′ are fixed by a jig during brazing in the furnace of the heat exchanger, the cutout 40 is formed in the tank 11.
Does not rotate in a direction communicating with the inlet / outlet side of the tank in which the heat exchange medium does not flow.

Finally, the heat exchanger described so far is
Although it is a one-sided tank type, it goes without saying that even if it is a two-sided tank type, the above invention can be used as long as it has a structure in which both the inlet and outlet pipes are connected to one tank.

[0047]

As described above, according to the heat exchanger of the first aspect, the inlet / outlet pipe is opened on one of the tank inlet side and the outlet side provided on the extension of the partition wall of the tank of the heat exchanger. Since it has a structure to be attached to the pipe insertion part, it is possible to maximize the size of the diameter that is approximately the same as the width of the tank in the ventilation direction. Therefore, even if the width of the tank in the ventilation direction is reduced, the diameter of the inlet / outlet pipe suppresses passage resistance. Since the size can be made and the structure is simple, an increase in manufacturing cost can be suppressed.

Further, according to the heat exchanger of the second aspect, the positioning can be easily performed by inserting the inlet / outlet pipe into the pipe insertion portion until it abuts on the protruding portion.

According to the heat exchanger of the third aspect, the inlet / outlet pipe is inserted into the insertion hole provided on the extension of the partition wall of the tank of the heat exchanger, and the tip of the partition wall is brought into contact with the pedestal. Since the structure is in contact with each other, it is possible to maximize the size of the diameter that is almost the same as the width of the tank in the ventilation direction. Moreover, since the structure is simple, the increase in manufacturing cost can be suppressed.

Further, according to the heat exchanger of the fourth aspect, the opening area of the inlet / outlet pipe can be increased, so that the flow rate of the heat exchanger is increased and the passage resistance of the heat exchanger is reduced. be able to.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the overall structure of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a part of an assembling process of the heat exchanger of the above.

FIG. 3 is an explanatory view showing a connection structure between a tank and an inlet / outlet pipe, which is a main part of the above heat exchanger.

FIG. 4a is a sectional view taken along line AA of the above heat exchanger, and FIG. 4b is a sectional view taken along line BB of the above heat exchanger.

FIG. 5 to FIG. 7 are exploded views of modifications of the partition wall and the deep drawing tank member of the heat exchanger of the above.

6A and 6B are cross-sectional views of a modified example of the heat exchanger of the above, viewed in the stacking direction.

FIG. 7 is a cross-sectional view taken along line CC of the modification of the heat exchanger of the above when viewed in the ventilation direction.

FIG. 8 is an explanatory diagram showing a connection structure between a tank and an inlet / outlet pipe, which is a main part of a heat exchanger different from the previous embodiment.

9a is a DD line sectional view of the above heat exchanger, and FIG. 9b is a EE line sectional view of the above heat exchanger.

FIG. 10 is an explanatory view showing a part of the assembling process of the same.

[Explanation of symbols]

 2 Tube element 3 Fin 9 Inlet pipe 9'Inlet pipe 10 Outlet pipe 10 'Outlet pipe 11 Tank 10 Partition wall 10' Partition wall 13 Deep drawing tank member 20 Tank inlet side 21 Tank outlet side 22 Recessed portion 23 Projection portion 25 Pipe insertion Part 26 Pipe insertion part 27 Bottom part 28 Side part 30 Opening part 31 Notch 33 Insertion hole 34 Insertion hole 35 Pedestal 36 Pedestal 40 Cutout part

Claims (4)

[Claims] 1. A tank whose inside is divided into an inlet side and an outlet side by a partition wall extending in the stacking direction, an inlet / outlet pipe communicating with the inlet side or the outlet side of the tank, and an inlet side and an outlet side of the tank. In a heat exchanger comprising a tube element that is communicated with and is laminated in a plurality of stages via fins, a bottomed pipe insertion part to which the inlet and outlet pipes are connected is provided on a partition wall extension of the tank, The pipe insertion portion and the partition wall are brought into contact with each other without a gap, the inner peripheral surface of the pipe insertion portion is gradually narrowed from the opening, and the distal end portion of the inlet / outlet pipe is brought into contact with the inner peripheral surface, and the pipe insertion is further performed. A heat exchanger characterized in that an opening opening to the inlet side or the outlet side is provided on the bottom portion side of the portion that is in contact with the inlet / outlet pipe. 2. A notch is provided in a bottom portion of the pipe insertion portion, and the partition wall is fitted into the notch and protrudes into the pipe insertion portion and is inserted into the pipe insertion portion. The heat exchanger according to claim 1, wherein a protrusion is formed so as to abut the tip of the inlet / outlet pipe. 3. A tank whose inside is divided into an inlet side and an outlet side by a partition wall extending in the stacking direction, an inlet / outlet pipe communicating with the inlet side or the outlet side of the tank, and an inlet side and an outlet side of the tank. In a heat exchanger including a tube element that is communicated with and is laminated in multiple stages via fins, an insertion hole into which the inlet / outlet pipe is inserted and joined is provided on an extension of the partition wall of the tank, and the partition wall The heat exchanger is characterized in that a pedestal is formed in which a portion facing the insertion hole is bent toward the inlet side or the outlet side and abuts against a tip end portion of the inlet / outlet pipe. 4. The heat exchange according to claim 3, wherein a portion protruding from the pedestal is axially cut out at a tip end portion of the inlet / outlet pipe in a range in which the portion is inserted into the tank. vessel.