KR101149983B1 - A plate heat exchanger of welding type - Google Patents

Abstract

PURPOSE: A plate heat exchanger of a welding type is provided to simplify a manufacturing process because a heat exchanger is manufactured by forming a cut-out unit in an edge side of laminated electric heat plates and directly welding an intake pipe and discharge pipe to the cut-out unit. CONSTITUTION: A plate heat exchanger of a welding type comprises an electric heat assembly, an intake pipe(121), an discharge pipe(122), and outer plates(131,132). The electric heat assembly comprises cut-out units respectively formed in each four edges and composed of a plurality of electric heat plates laminated in up and down directions. An opening is formed in a side of the intake and discharge pipes along a longitudinal direction. The intake and discharge pipes are welded to the cut-out unit so that fluid flows and discharges through a fluid flow path. The outer plates are respectively joined to the upper and lower part of the electric heat assembly.

Description

A plate heat exchanger of welding type

The present invention relates to a welded plate heat exchanger, and more particularly, to form a cutout on the edge side of the heat transfer plate to be laminated, and to produce a heat exchanger by directly welding the oil and the inlet and outlet pipe having openings through which fluid flows in and out. The present invention relates to a welded plate heat exchanger capable of simplifying a manufacturing process by reducing a welding amount for manufacturing a heat exchanger.

In general, heat exchangers are for transferring heat from one fluid (or gas) to another without physical contact. In other words, it is a device used to heat or cool one fluid indirectly by transferring only heat without fluid mixing.

It is effective that such a heat exchanger is large in size, and the unit cost of the heat exchanger increases in proportion to the size. Therefore, it is important to perform large capacity heat exchange at a low cost. Among the types of heat exchanger, the shell & tube type has a very small heat exchange rate compared to its size, and thus many plate heat exchangers with high heat exchange performance have been developed. to be.

The welded plate heat exchanger is divided into full welding type and semi-welding type, and the automatic welding (laser welding, core welding, CO ₂ welding, Tig) to perform the brazing production method and the welding work produced outside in the vacuum furnace according to the manufacturing method. Welding). The environment using such a heat exchanger can be manufactured from low temperature / low pressure to high temperature / high pressure, small capacity to large capacity, and can be applied in various environments.

1 shows a schematic structure of a conventional welded plate heat exchanger 1, in which a plurality of heat transfer plates 10 are stacked to form a heat transfer assembly, and a low temperature side inlet is provided on both top and left and right sides of the heat transfer assembly. Header boxes 12, 14, 16, and 18 that serve as / football and hot side inlet / outlet are further provided.

This conventional heat exchanger is not only bulky because the header box is additionally attached, but also requires a lot of welding work therefor. Accordingly, the production cost for manufacturing the plate heat exchanger is increased due to the increase in manufacturing cost and the decrease in productivity, and the volume of the heat exchanger is inevitably increased, resulting in an increase in the installation area.

In addition, since a lot of welding work is made, there is a problem in that a welding failure occurs in the working process and a fluid accident leaks to the outside. In addition, the header box attached in the form of a rectangular box has a problem of high overall probability of cracking when used at high pressure.

The present invention is to solve the above problems, by forming a cutout on the edge side of the heat transfer plate to be laminated, heat-exchanging by making a heat exchanger by directly welding the oil, the access pipe having an opening through which fluid flows in and out It is to provide a welded plate heat exchanger that can reduce production cost and improve productivity by reducing the amount of welding for fabrication of the machine.

In order to achieve the above object, the present invention is a plate heat exchanger in which a heat transfer plate having a heat transfer surface having a rectangular plate shape is laminated, and the heat transfer surfaces are disposed to face each other so that a fluid passage is formed with cutouts formed at four corners, respectively. A heat transfer assembly including a plurality of heat transfer plates stacked in up and down directions; An opening / exit pipe having an opening formed at one side in a longitudinal direction and welded to the cutout portion so that the opening side communicates with the fluid passage so that the fluid can flow into and out of the fluid passage through the opening; It provides a welded plate heat exchanger comprising; and an outer plate respectively coupled to the upper and lower portions of the heat transfer assembly.

Preferably, the heat transfer plate is provided at both ends with a first flange bent higher than the heat transfer surface and a second flange formed bent lower than the heat transfer surface, the first flange and the second flange are alternately arranged And the first flange of the heat transfer plate disposed on the upper portion and the second flange disposed on the lower portion may be welded to each other.

Preferably, the cutout may be formed on the first flange and the second flange.

Preferably, the mutual bonding of the first flange and the second flange may be made of any one of core welding, CO ₂ welding, Tig welding or automatic welding.

Preferably, the inner plate may be additionally provided between the heat transfer assembly and the outer plate to increase airtightness with the outside.

Preferably, any one side of the outer plate disposed on the upper, lower portions of the heat transfer assembly may be provided with an outlet and an inlet to communicate with the oil, the inlet and outlet pipe, respectively.

Preferably, the cutout and the oil and the inflow pipe may be exposed to the outside of the weld.

Preferably, the flow-in and out pipes may be formed to have a polygonal cross section, a circular cross section and a cross section in combination thereof.

Preferably, the front plate of the heat transfer assembly may be additionally provided with a side plate to prevent the fluid flowing through the fluid passage to leak to the outside.

Preferably, the heat transfer surface may be formed in an embossing pattern in which the peaks and valleys are repeatedly provided.

According to the present invention, there is no need to attach a separate header box by forming a cutout at the corner of the heat transfer plate to be laminated, and directly manufacturing a heat exchanger by directly welding the oil / exit pipe having openings through which fluid flows in and out. There is an effect that can reduce the amount of welding for the production of heat exchanger to simplify the manufacturing process to reduce the production cost and improve the productivity.

1 is a schematic view showing a conventional welded plate heat exchanger.
Figure 2 is a perspective view showing a welded plate heat exchanger according to the present invention.
3 is an exploded perspective view of FIG. 2;
Figure 4 is a perspective view of the heat transfer assembly in a welded plate heat exchanger according to the present invention.
5 is a longitudinal cross-sectional view and a cross-sectional view of FIG. 4.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

In order to facilitate understanding of the present invention, the same reference numerals will be used to denote the same constituent elements even if they are shown in different drawings.

Welded plate heat exchanger 100 according to a preferred embodiment of the present invention is a plurality of cut-out portion (114a1, 114b, 114c, 114d) in four corners of each of the heat transfer plate (110) constituting the heat transfer assembly (A) And weld the inlet pipe 121 and the outlet pipe 122 through which the fluid flows in and out of the cutouts 114a1, 114b, 114c, 114d to form a heat exchanger 100. It is easy to weld because it is exposed to prevent leakage of fluid sufficiently and improve productivity.

The welded plate heat exchanger 100 includes a heat transfer assembly A, oil and flow pipes 121 and 122, and a pair of outer plates 131 and 132.

The heat transfer assembly (A) is arranged in a state in which a plurality of heat transfer plate 110 is spaced apart so as to form a fluid passage (S), one end is welded in a zigzag manner, the two different types of fluids are not mixed with each other. To allow heat exchange to occur.

That is, the plurality of heat transfer plates 110 constituting the heat transfer assembly (A) is provided in a substantially rectangular plate shape having a heat transfer surface 112, and for bonding with other heat transfer plates 110 stacked on top and bottom. The first flange 116 and the second flange 118 are provided at the end.

The heat transfer surface 112 has a predetermined area to form a fluid passage (S) through which the fluid is moved in pairs with the heat transfer surface 112 disposed opposite to the upper and lower sides, and the valleys (not shown) and the peak on the surface. It is preferable to maximize the heat exchange efficiency by forming an embossed pattern (not shown) repeatedly formed to widen the heat transfer area.

The first flange 116 is bent higher than the heat transfer surface 112 forming the fluid passage, and the second flange 118 is bent lower than the heat transfer surface 112. The first and second flanges are bent by press working.

As such, the heat transfer plates 110 on which the first flange 116 and the second flange 118 are formed are respectively spaced apart from each other so as to form a fluid passage S through which the fluid moves. The first flange 116 and the second flange 118 are stacked in such a way that they are alternately arranged.

Accordingly, referring to the left side in FIG. 5B, the second flange 118 of the heat transfer plate 110 disposed on the upper portion is interviewed with and joined to the first flange 116 of the heat transfer plate disposed on the lower portion thereof. The second flange 118 of the heat transfer plate is disposed in the interview with the first flange 116 of the heat transfer plate 110 is formed in the form that is mutually bonded.

For this reason, the heat transfer assembly (A) is formed in each of the first flange 116 and the second flange 118 provided at both ends of the heat transfer plate 110 in the opposite direction relative to the heat transfer surface 112 and the first Since the flange 116 and the second flange 118 are stacked in an alternately arranged shape, the flange 116 and the second flange 118 are alternately bonded to each other in a zigzag shape to form a fluid passage S in which one side is opened and the other side is sealed by mutual bonding.

In this way, the plurality of heat transfer plates 110 are stacked on each other, so that the first flange 116 and the second flange 118 are before and after the heat transfer assembly A in which the fluid passage S is formed through the zigzag bonding. , Left and right sides, as shown in FIGS. 4 and 5, separate side plates 141 and 142 are welded to seal the open portion of the fluid passage S. FIG.

Here, the mutual bonding of the first flange 116 and the second flange 118 is bonded through core welding, CO 2 welding, Tig welding or automatic welding.

On the other hand, the heat transfer plate 110 provided in the shape of a square plate is provided with cutouts 114a1, 114b, 114c, 114d are formed in each of the four corners. As shown in FIGS. 2 and 3, the cutouts 114a1, 114b, 114c, and 114d come into contact with the side surfaces of the inflow pipe 121 and the outflow pipe 122 to weld the fluid toward the fluid passage S. Allow it to flow in and out.

Here, the inflow pipe 121 and the outflow pipe 122 are provided to have a predetermined length by having openings 121a and 122a that are formed in the side portion in the longitudinal direction. Accordingly, the heat transfer assembly A joined in a zigzag manner such that one side has a sealed fluid passage S through the first flange 116 and the second flange 118 has the remaining open portions of the side plates 141 and 142. The inlet pipe 121 and the outlet pipe 122 are directly welded to the cutouts 114a1, 114b, 114c, and 114d by being sealed by the liquid, thereby preventing the leakage of fluid. Through the openings (121a, 122a) provided on one side of the 122 to allow the fluid to flow into or out of the fluid passage (S) side.

As described above, in the welded plate heat exchanger 100 according to the present invention, the inlet pipe 121 and the outlet pipe 122 are directly connected to the cutouts 114a1, 114b, 114c, and 114d provided at four corners of the heat transfer plate 110. Since the welded part constitutes a heat exchanger, the welding part is exposed to the outside, so the work is very easy to increase productivity, and since the welding is performed directly from the outside, welding defects generated during the welding process can be prevented.

Meanwhile, in the drawing, the inlet pipe 121 and the outlet pipe 122 are provided in a substantially cylindrical shape having a predetermined height, and the cutouts 114a1, 114b, 114c, 114d are provided in the shape of an arc corresponding thereto. Although not shown, it is not limited thereto, but it is understood that it may be provided in the form of a polygonal pillar such as a square pillar or a triangular pillar.

The outer plates 131 and 132 are provided in a rectangular plate shape having a larger area than the heat transfer plate 110 and are coupled to the upper side and the lower side of the heat transfer assembly A, respectively. The outer plates 131 and 132 are provided to have a relatively thick thickness so that the plate heat exchanger according to the present invention can be used even at high temperature / high pressure. At this time, any one side 131 of the pair of outer plates (131, 132) is provided in the form having the inlet (133a, 133b) and the outlet (134a, 134b) in communication with the inlet pipe 121 and outlet pipe 122. do. Here, the inlets 133a and 133b and the outlets 134a and 134b are provided in two, respectively, and two different types of fluids are introduced into the fluid passage S through the inlets 133a and the inlet pipe 121, respectively. After the heat exchange with the fluid introduced into the fluid passage (S) through the other inlet (133b) and the inlet pipe 121 is made to be discharged again to the outside through different outlets (134a, 134b).

Meanwhile, a separate inner plate 150 may be additionally provided between the outer plates 131 and 132 and the upper and lower surfaces of the heat transfer assembly A to increase airtightness with the outside. The inner plate 150 is provided to have a thickness relatively thinner than the outer plate (131,132), and supports the heat transfer plate 110, the heat transfer surface 112 is formed in the embossed pattern to be easily stacked on the outer plate (131,132). Play a role. The inner plate 150 is also provided with cutouts 154a, 154b, 154c, and 154d at four corners such that the inlet pipe and the outlet pipe are welded.

According to the present invention, there is no need to attach a separate header box by forming a cutout at the corner of the heat transfer plate to be laminated, and directly manufacturing a heat exchanger by directly welding the oil / exit pipe having openings through which fluid flows in and out. There is an effect that can reduce the amount of welding for the production of heat exchanger to simplify the manufacturing process to reduce the production cost and improve the productivity.

While the foregoing is directed in detail to a particular embodiment of the invention with reference to the drawings, it is not intended to limit the invention to this specific construction. Those skilled in the art will be able to easily modify or change without departing from the technical spirit described in the claims below. However, all such simple design variations or modifications are clearly disclosed in advance within the scope of the present invention.

100: welded plate heat exchanger
110: heat transfer plate 112: heat transfer surface
114a, 114b, 114c, 114d: Incision 116: First flange
118: second flange A: heat transfer assembly
S: fluid passage 121: inlet pipe
121a: Opening 122: Outflow pipe
122a: opening 131,132: outer plate
133a, 133b: inlet 134a, 134b: outlet
141,142: side plate 150: inner plate

Claims (10)

In a plate heat exchanger in which a heat transfer plate having a heat transfer surface having a rectangular plate shape is laminated,
A heat transfer assembly having a plurality of heat transfer plates stacked in up and down directions with the heat transfer surfaces disposed to face each other such that fluid passages are formed to have cutouts formed at four corners;
An opening / exit pipe having an opening formed at one side in a longitudinal direction and welded to the cutout portion so that the opening side communicates with the fluid passage so that the fluid can flow into and out of the fluid passage through the opening; And
Welded plate heat exchanger comprising a; outer plate coupled to the upper and lower portions of the heat transfer assembly. The method of claim 1,
The heat transfer plate is provided at both ends with a first flange bent higher than the heat transfer surface and a second flange bent lower than the heat transfer surface, and the first flange and the second flange are alternately arranged to be disposed above Welded plate heat exchanger, characterized in that the first flange and the second flange disposed in the lower portion of the heat transfer plate are welded to each other. The method of claim 2,
The cut portion is welded plate heat exchanger, characterized in that formed on the first flange and the second flange. The method of claim 2,
Weld plate heat exchanger, characterized in that the mutual bonding of the first flange and the second flange is any one of core welding, CO ₂ welding, Tig welding or automatic welding. The method of claim 1,
Welded plate heat exchanger characterized in that the inner plate is further provided between the heat transfer assembly and the outer plate to increase the airtightness with the outside. The method of claim 1,
Welded plate heat exchanger, characterized in that the one side of the outer plate disposed in the upper, lower portion of the heat transfer assembly is provided with an outlet and an inlet communicating with the oil, the inlet and outlet pipe respectively. The method of claim 1,
Welded plate heat exchanger, characterized in that the cutout and the oil, the access pipe is exposed to the outside of the weld. The method of claim 1,
The oil-and-oil pipe is welded plate heat exchanger, characterized in that it is formed to have a polygonal cross section, a circular cross section and a cross section combined. The method of claim 1,
Welded plate heat exchanger, characterized in that the side plate is further provided to prevent leakage of the fluid moving through the fluid passage to the front / rear / left / right of the heat transfer assembly. The method of claim 1,
The heat transfer surface is a welded plate heat exchanger, characterized in that formed in the embossed pattern is provided with a peak and the valley portion repeatedly.

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