JP3527704B2 - Plate heat exchanger - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a brazing-type plate heat exchanger in which a plurality of heat transfer plates such as stainless steel plates are laminated and integrally assembled by brazing and fixing.

[0002]

2. Description of the Related Art A conventional example of a brazing type plate heat exchanger will be described with reference to FIG. This plate-type heat exchanger includes a plurality of heat transfer plates 1 that are stacked on top of each other and integrally assembled by brazing, and a plurality of heat transfer plates 1 that are integrally assembled are protected above and below. It is composed of a pair of pressure resistant frames 11 and 12 brazed and fixed via plates 1 ′ and 1 ″, and metal nozzles 21 and 22 brazed and fixed to one of the pressure resistant frames 11.

Each heat transfer plate 1 is made of, for example, a substantially rectangular thin plate made of stainless steel and has the same external dimensions, and openings 2 and 3 for allowing two kinds of fluids to flow in and out are formed at four corners. Note that FIG. 3 shows only the openings 2 and 3 at both corners located on the one end side in the longitudinal direction.

Further, each heat transfer plate 1 has a corrugated plate-shaped heat transfer portion 1a having an unevenness in a central portion, and an outer peripheral portion 1b in which a peripheral edge of the heat transfer portion 1a is bent into a substantially L shape, The outer peripheral portion 1b of each of the laminated heat transfer plates 1 and the peripheral edge portions of the openings 2 and 3 are brazed and fixed, and the contact portions of the heat transfer portion 1a are brazed and fixed to be integrally assembled.

The protective plates 1 ′ and 1 ″ are made of, for example, a stainless steel rectangular plate, and have a flat portion 1 having no unevenness.
The outer peripheral portions 1b ', 1b "are formed by bending around the peripheral edges of a', 1a".

The pressure-resistant frames 11 and 12 are made of, for example, a substantially rectangular thick plate made of stainless steel and have the same outer dimensions, and metal nozzles 21 and 22 serving as inlets and outlets of two kinds of fluids are provided at four corners of one pressure-resistant frame 11. It is penetrated and fixed by brazing. Note that, in FIG. 3, only the nozzles 21 and 22 at both corners located on the one end side in the longitudinal direction are shown.

When a plurality of heat transfer plates 1 are integrally assembled, fluid passages P and Q through which the two kinds of fluids A and B flow are alternately formed between the heat transfer plates 1. For example, when both nozzles 21 and 22 of the pressure-resistant frame 11 are used as fluid inlet nozzles, one type of fluid A flows from one nozzle 21 through the openings 2 of the heat transfer plates 1 and the fluid passage P is formed from the openings 2.
Through the fluid outlet nozzle (not shown). Another type of fluid B flows from the other nozzle 22 through the openings 3 of the plurality of heat transfer plates 1, flows through the fluid passage Q from the openings 3, and flows out from a fluid outlet nozzle (not shown) to the outside. Adjacent fluid passages P and Q have two types of fluids A and B.
While heat is flowing, heat is exchanged via the heat transfer portion 1a of the heat transfer plate 1.

In the plate heat exchanger, when the pressure resistant frames 11 and 12 and the plurality of heat transfer plates 1 are stacked and fixed to each other by brazing, the nozzles 21 and 22 are also fixed to the pressure resistant frame 11 by brazing. . At that time, the brazing position of the pressure resistant frame 11 and the nozzles 21 and 22 may be displaced when tightening the pressure resistant frames 11 and 12 and the heat transfer plates 1 that have been stacked, or during the brazing heat treatment process. Thereby the nozzles 21, 22
There is a risk of defective brazing. Therefore, the nozzle 2
In order to prevent brazing failure of Nos. 1 and 22,
It is necessary to preliminarily fix 22 to the pressure-resistant frame 11 by welding, crimping, screwing or the like.

[0009]

By the way, in the conventional brazing type plate heat exchanger, as described above, the nozzles 21 and 22 are previously welded to the pressure resistant frame 11 by caulking,
Although it is necessary to temporarily fix the nozzles 21 and 22 to the pressure resistant frame 11 by screwing or the like, when the nozzles 21 and 22 are temporarily fixed to the pressure resistant frame 11, the nozzles 21 and 22 and the pressure resistant frame 11 are not closely fixed (within a gap of 0.1 mm). Poor quality such as wax breakage occurs. For this reason, the work is considerably troublesome and the work efficiency is extremely low, so that there is a problem that it takes a lot of labor and time to improve the productivity.

An object of the present invention is to provide a brazing-type plate heat exchanger capable of performing good brazing and improving productivity.

[0011]

[Means for Solving the Problems] Technical means for achieving the above object of the present invention is to stack a plurality of heat transfer plates and assemble them integrally by brazing, and to assemble the plurality of plates assembled together. A pair of pressure resistant frames were brazed and fixed to both ends of the heat transfer plate directly or through protection plates, and nozzles which were two kinds of fluid inlet and outlet for heat exchange were brazed and fixed to one of the pressure resistant frames. In a brazing-type plate heat exchanger, a sandwiched flange portion is formed at the peripheral edge of the nozzle so that the two types of fluid can be discharged.
One of the inlet nozzles is the flanking flan
Two pieces that form a fluid passage through which one type of fluid flows
Sandwiched between the heat transfer plates of the
A fluid passage through which another fluid flows is formed in the lunge section.
It is characterized by being sandwiched between two heat transfer plates .

In this case, the held flange of the nozzle
The part is 2 of the forming depth of the unevenness in the heat transfer part of the heat transfer plate.
It has a thickness equivalent to twice that of the heat transfer plate between the two heat transfer plates.
By filling the gap formed by the molding depth of the heat transfer part
Sandwich it .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to FIGS. 1 and 2. 1 and 2
In FIG. 3, the same reference numerals are used for the same or corresponding portions as those in FIG. 3 showing the conventional example.

FIG. 1 shows a plate heat exchanger according to the first embodiment, in which a plurality of heat transfer plates 1 are vertically stacked and integrally assembled by brazing, and the plurality of integrally assembled plates are assembled. Protective plates 1 ′ and 1 ″ above and below the heat transfer plate 1 (the upper protective plate 1 ′ in FIG. 1)
(Only shown) via a pair of pressure resistant frames 11,1
2 (only the pressure-resistant frame 11 located on the upper side is shown in FIG. 1) is brazed and fixed, and one pressure-resistant frame 1
Nozzles 1 and 2 made of metal, which serve as inlets and outlets for fluids A and B
2 is brazed and fixed.

The plurality of heat transfer plates 1 assembled integrally form fluid passages P and Q in which two kinds of fluids A and B flow alternately between the heat transfer plates 1, and adjacent fluid passages are formed. Heat exchange is performed via the heat transfer plate 1 while the two types of fluids A and B flow through P and Q.

The pressure resistant frame 11 has nozzles 2 at four corners.
Through holes 13 and 14 are formed so that the through holes 1 and 22 pass therethrough (in FIG. 1, the through holes 13 and 14 located at one end in the longitudinal direction are located at both ends).
(Only shown), the peripheral portion of the through hole 14 through which the nozzle 22 penetrates is projected upward to form the holding portion 15.

The nozzles 21 and 22 have sandwiched flange portions 21 a and 22 a formed at the peripheral edges of the base ends, and one of the nozzles 21
The sandwiched flange portion 21a is sandwiched between the protective plate 1'and the heat transfer plate 1 located at the uppermost stage, and the other nozzle 22 has the sandwiched flange portion 22a at the pressure-resistant frame 1.
1 and the holding portion 15 of the protective plate 1 '. Here, the sandwiched flange portion 21a of the nozzle 21 has a thickness corresponding to the forming depth of the unevenness of the heat transfer portion 1a of the heat transfer plate 1, and the protection plate 1'and the heat transfer plate positioned at the uppermost stage. It is sandwiched between the heat transfer plate 1 and the heat transfer plate 1 so as to fill the gap formed by the molding depth of the unevenness in the heat transfer portion 1a of the heat transfer plate 1. Further, the held flange portion 22a of the nozzle 22 has a thickness corresponding to the protruding depth of the holding portion 15 of the pressure-resistant frame 11, and the holding portion between the pressure-resistant frame 11 and the holding portion 15 of the protective plate 1 '. It is sandwiched so as to fill the gap formed by 15.

As described above, the held flange portions 21a and 22a of the nozzles 21 and 22 are sandwiched between the protective plate 1'and the heat transfer plate 1 and between the pressure resistant frame 11 and the protective plate 1 ', so that the nozzle 21, Since 22 is fixed to the pressure-resistant frame 11, the pressure-resistant frame 11 and the nozzles 21 and 22 are connected to each other during the tightening of the plurality of heat transfer plates 1 and the pressure-resistant frames 11 and 12 after lamination and during the brazing heat treatment process. Brazing position does not shift. This can prevent brazing defects of the nozzles 21 and 22, and it is not necessary to temporarily fix and fix the nozzles 21 and 22 to the pressure resistant plate 11 in advance.

FIG. 2 shows a plate heat exchanger according to a second embodiment, in which the held flange portion 21 of the nozzles 21 and 22 is held.
a and 22a are sandwiched between the heat transfer plates 1. That is, the held flange portion 21a of the one nozzle 21
Is located in the uppermost stage and is a fluid passage P through which one kind of fluid A flows
Of the two heat transfer plates 1 that form a fluid passage P through which another type of fluid B flows, in which the held flange portion 22a of the other nozzle 22 is located at the uppermost stage. It is sandwiched between the heat transfer plates 1. Here, the sandwiched flange portions 21a and 22 of the nozzles 21 and 22 have a thickness corresponding to twice the forming depth of the unevenness of the heat transfer portion 1a of the heat transfer plate 1, and the two heat transfer plates are provided. The heat transfer section 1a is sandwiched between the two by filling the gap formed by the molding depth of the heat transfer section 1a.

As described above, the sandwiched flange portions 21 a and 22 a of the nozzles 21 and 22 are sandwiched between the heat transfer plates 1, so that the nozzles 21 and 22 are made to withstand the pressure resistant frame 1.
Since it is fixed with respect to No. 1, the plurality of heat transfer plates 1 and the pressure resistant frame 1 are provided as in the first embodiment.
The brazing positions of the pressure resistant frame 11 and the nozzles 21 and 22 do not deviate during tightening after laminating Nos. 1 and 12 and during the brazing heat treatment process, so that defective brazing of the nozzles 21 and 22 can be prevented and the nozzle 21, It is not necessary to temporarily fix 22 to the pressure resistant frame 11 in advance.

According to the plate heat exchanger of the second embodiment, the sandwiched flange portion 21 of the nozzles 21 and 22.
By sandwiching a and 22a between the heat transfer plates 1,
As in the first embodiment, the holding portion 15 is attached to the pressure resistant frame 11.
Need not be formed.

Although the first and second embodiments of the present invention have been described above, the present invention is not limited to these embodiments and various modifications can be made. For example,
In the second embodiment, the sandwiched flange portions 21a and 22a of the nozzles 21 and 22 are sandwiched between the heat transfer plates 1, but the sandwiched flange portion 21a of the nozzle 21 is located at the uppermost stage with the protective plate 1 '. Even if it is sandwiched between the heat transfer plate 1 and the sandwiched flange portion 22a of the nozzle 22 is sandwiched between the heat transfer plates 1, the same operation can be performed without forming the sandwiching portion 15 in the pressure resistant frame 11.

Further, in the first and second embodiments,
A pair of pressure resistant frames 11, 1 are provided above and below the plurality of heat transfer plates 1 assembled together through protective plates 1 ′, 1 ″.
2 are brazed and fixed, but a pair of pressure resistant frames 1 are directly provided on the upper and lower sides of a plurality of heat transfer plates 1 assembled together.
The same operation can be performed by fixing 1 and 12 by brazing. In this case, in the first embodiment, the held flange portions 21a and 22 of the nozzles 21 and 22 are sandwiched between the pressure resistant frame 11 and the heat transfer plate 1 located at the uppermost stage.

Further, in the first and second embodiments,
The nozzles 21 and 22 serving as inlets and outlets of the fluids A and B are brazed and fixed to the pressure resistant frame 11 located on the upper side, but the nozzles 21 and 22 serving as inlets and outlets of the fluids A and B are mounted to the pressure resistant frame located on the lower side. The same operation can be performed by brazing and fixing.

[0025]

EFFECTS OF THE INVENTION The present invention is a brazing-type plate heat exchanger, in which a flange to be clamped is provided at the peripheral edge of the nozzle.
Part of the nozzle that serves as a port for two types of fluid.
One type of fluid is
It is sandwiched between two heat transfer plates that form a fluid passage for circulation.
Insert the held flange part of the other nozzle into another type
Heat transfer play that forms a fluid passage through which the fluid of
Since it is sandwiched between the nozzles, it is possible to prevent brazing failure of the nozzle, and the work of temporarily fixing the nozzle to the pressure resistant plate beforehand can be omitted, so good brazing can be performed and productivity can be improved. An improved brazing type plate heat exchanger can be obtained. Well
Moreover, it is not necessary to form the holding portion on the pressure resistant frame.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a plate heat exchanger.

FIG. 2 is a plate heat exchanger showing an embodiment of the present invention .
FIG.

FIG. 3 is a cross-sectional view of a main part of a plate heat exchanger showing a conventional example.

[Explanation of symbols]

1 Heat transfer plate 1 ', 1 "protection plate A few openings 11 Pressure-resistant frame 15 Clipping part 21,22 nozzle 21a, 22a Clamped flange part A, B fluid P, Q fluid passage

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Claims (2)

(57) [Claims] 1. A plurality of heat transfer plates are laminated and assembled integrally by brazing and fixed, and a pair of heat transfer plates integrally assembled is directly connected to both ends of the heat transfer plate or through a protective plate. Brazing-type plate heat exchanger in which a pressure-resistant frame of No. 2 is brazed and fixed, and one of the pressure-resistant frames is brazed with nozzles that serve as inlets and outlets for two types of fluids for heat exchange. clamping flange is formed, the
Nozzle of one of the nozzles that is the entrance and exit of two types of fluid
The clamped flange part of the
It is sandwiched between two heat transfer plates that form a passage, and the other
Another type of fluid flows through the clamped flange of the nozzle.
Sandwiched between two heat transfer plates that form a fluid passage
Plate heat exchanger, characterized in that it. 2. The sandwiched flange portion of the nozzle is a heat transfer plate.
It corresponds to twice the forming depth of the unevenness in the heat transfer part of the rate
The thickness of the heat transfer part is between the two heat transfer plates.
It is sandwiched by the shape that fills the gap formed by the shape depth
Plate heat exchanger according to claim 1, characterized in that is.