KR20000050519A - Unit plate of a parallel heat exchanger - Google Patents

Abstract

PURPOSE: A component plate of a parallel type heat exchanger is provided to increase surface area of flow passage formed between the respective component plates crossly overlapped, thereby improving heat exchange efficiency. CONSTITUTION: A component plate(1) of a parallel type heat exchanger includes through holes(H) at four corners of the component plate in the approximately rectangular shape, shutting ribs(R3) are formed on respective two through holes in a symmetrical direction, a plurality of such a component plate being crossly overlapped for forming heating water-returning water and water-warm water passages alternately, and introducing ribs(R1,R2) for promoting water flow between the respective layers, wherein passage ribs(4) are disposed in the shape of "V" or fish born and the passage ribs are made in forms of wave by deep drawing on a blank of the component plates.

Description

Unit plate of a parallel heat exchanger

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single type gas boiler system, and more particularly, to a unit component plate constituting a parallel heat exchanger in a plate heat exchanger used as the hot water heat exchanger.

A boiler is a device that provides heating or hot water by using heated water or steam generated by heating water. These boilers use a variety of fuels, and can be classified into instant heating type and low boiling type according to the heating characteristics of the fuel.

The low boiling water boiler heats water using briquettes or oil as fuel and stores it in a hot water storage tank to supply heating or hot water as needed. On the other hand, the instantaneous heating boiler has a main heat exchanger and / or a hot water heat exchanger in the body so that it can immediately supply heating or hot water if necessary. Gas boilers correspond to instantaneous heating boilers. Recently, the gas boilers are widely used as household heating boilers due to the ease of supply and use of city gas.

Gas boilers are also divided into single type and dual type according to the supply method of heating water and hot water, that is, the configuration of the heat exchanger. In the single type system, the main heat exchanger performs only heat exchange of the heating water, and the hot water is heated separately using a secondary heat exchanger or a hot water heat exchanger using the heating water heated in the main heat exchanger. On the other hand, the dual type system simultaneously heats the heating water and hot water in the main heat exchanger.

1 schematically shows a gas boiler system employing the above-described single method. In FIG. 1, a heat exchanger X is provided above burner B to heat the heating water. In an open system equipped with a supplementary tank (not shown), the circulating water supplied from the supplementary tank is preheated by circulating the preheating tube P installed at the outer circumference of the heat exchanger X, and then the heating tube inside the heat exchanger X Heated through (H), then heated via a three-way valve (V).

On the other hand, the downstream side of the three-sided (V) is connected to the secondary heat exchanger (X2) through the hot water heating tube (W), the secondary heat exchanger (X2) is a sandwich (sandwitch) of the heating water pipe and the direct water pipe line Is crossing. When the user opens the hot water valve, the three-way valve (V) cuts off the supply to the heating pipe, converts the heating water heated in the heat exchanger (X) into the hot water heating pipe (W), and heats the direct water with hot water. Is returned to the heat exchanger (X) via the refill tank.

In such a single-type gas boiler system, the secondary heat exchanger (X2), that is, a conventional heat exchanger was mainly used as a hot water heat exchanger. However, in recent years, the plate heat exchanger illustrated in FIG. Mainly used.

In FIG. 2, one component plate U of the plate heat exchanger is formed with two through holes H1 and H2 at intervals of 90 °, and one through hole H2 is formed in the circular rib R3 to form another through hole H1. ) And a step corresponding to the height of the ribs R1 to R3 is formed.

When the plurality of component plates U having such a configuration are laminated by staggering by 90 °, the through holes H2 in the circular ribs R3 of the component plates U have the through holes H1 of the upper component plates U. ) And the component plates U constitute a plate heat exchanger in communication with each other. At this time, the inlet and the outlet on each path have a distance of 180 °, and the circulating water flowing into the through hole H1, which becomes the inlet, flows in a complicated path in the space formed by the ribs, and then the circular shape of the upper component plate U The through-hole H2 in the rib R3 flows out to the downstream side of the upper layer or the lower layer as an outlet.

Accordingly, the heated water from the heat exchanger X introduced into the plate heat exchanger X and the direct water from the direct pipe are not mixed with each other, and are heat-exchanged, and are discharged as return water to the replenishment tank and hot water to the hot water pipe.

In such a heat exchanger, the path from the heated water to the return water and the path from the direct water to the hot water cross each other in complexity but each has a single path. Therefore, such a heat exchanger is called a direct type.

However, since the series heat exchanger has a complicated path as described above, the pipe resistance is large and the pressure loss is large. Accordingly, the series heat exchanger has a problem that it is difficult to use in a low pressure range with low direct pressure and has a low heat exchange efficiency.

This problem of pressure loss prevents sufficient hot water supply from the upper floors of low-rise apartments without direct pressure facilities, and it is easy for users to judge this problem as being caused by the boiler system. have.

Accordingly, attempts have been made to reduce the size of parallel heat exchangers, which are mainly used for large-scale industrial boilers, and to use them as hot water heat exchangers for domestic gas boiler systems.

As shown in FIG. 3, the parallel heat exchanger includes two through holes H1 and two through holes H2 in the shielding rib R3 in each component plate U '. Entering heated water is discharged to the return water outlet through a plurality of paths, and direct water entering the direct inlet is also discharged to the hot water outlet through the plurality of paths.

Accordingly, the pipe resistance is greatly reduced compared to the series type, and the heat exchange efficiency is improved, thereby reducing the size of the heat exchanger.

Figure 4 shows an example of the actual configuration of such a parallel heat exchanger, which is a utility model registration application No. 95-39048 (parallel heat exchanger), 96-21854 (of heat exchanger) Nipple coupling structure) and design registration No. 212841 (heat transfer fin of heat exchanger).

The heat exchanger is composed of a stack of a plurality of component plates (U1 to U3), each component plate (U1 to U3) is basically composed of a rectangular bowl surrounded by a flange (F) bent its outer periphery Through-holes H (forming H1 or H2 depending on the arrangement) are formed at four corners, and shielding ribs R3 surround two through-holes H of the four through-holes H.

On the other hand, the body of the component plates (U1 to U3) is a fishbone type, that is, a V-shaped path rib (R4) is arranged so that when the laminated between the component plates (U1 to U3) between the direct water and hot water The path V is formed.

Meanwhile, a nipple (N) is preferably coupled to the uppermost component plate (U3) for connection with an external pipe. For this purpose, a nipple (N) is formed around the through hole (H) of the uppermost component plate (U3). A sleeve S is formed to be in contact with the inside.

On the other hand, the through hole (H) is not formed in the lowermost component plate (U2) to shield the path.

In this case, all of the shielding ribs R3 are not provided and the ones provided are indicated by the same component plate U1, which forms two shielding ribs R3 on one side or diagonal of the four through holes H. This configuration can be obtained by stacking the component plates U1 alternately in opposite directions.

On the other hand, the component plates (U1 to U3) are configured by forming and piercing the plate material by blanking the plate material sequentially by a series of progressive molds. Accordingly, the U2 component plate is taken out before drilling the through hole H in the manufacturing process of the U1 component plate, and the U3 component plate is taken out during the expansion process of the through hole H. U3) can be obtained from one progressive mold.

Each of the component plates U1 to U3 and the nipples N are coated or placed with a suitable material such as a paste at the contact portion thereof, and then laminated as shown in FIG. 4 (A), followed by brazing furnace. When it is put into and heated, as shown in Fig. 4B, each of the component plates U1 to U3 and the nipples N are integrally joined to form a parallel plate heat exchanger. The configuration shown represents the direct inlet or hot water outlet side of this plate heat exchanger.

Figure 5 illustrates a component plate U1 constituting the body of such a heat exchanger, which is in particular according to the aforementioned design registration No. 212841.

As described above, the component plate U1 forms a through-hole H at four corners and a shielding rib R3 at two diagonal through-holes H, and has a directional rib in between. (R4) is formed, and stacked alternately in the opposite direction as shown in Fig. 4 (A), (B), the heat exchange in which the direct and hot water path and the heating water and return path are separated as shown in FIG. The group can be configured.

The pre-registered designs of the present inventors have two protruding ribs R3 in the diagonal direction of the four through holes H in the conventional fishbone structure plates U1 to U3 having a simple V-shaped path rib R4. It is possible to manufacture a plate heat exchanger by alternating stacking of the constituent plates U1 to U3 of a single type, and the heat exchanged by arranging the induction ribs R1 and R2 around the through hole H. It is configured to induce the movement between floors smoothly.

Here, the flow of the water of the heated water-returned water and the direct-hot water flows in a turbulent state because the flow path is complicated as will be described later. This heat exchange efficiency is mainly determined by the surface area of the flow path.

Based on these considerations, an object of the present invention is to provide a component plate of a parallel heat exchanger which can significantly improve heat exchange efficiency.

1 is a system diagram of a single gas boiler using a plate heat exchanger,

Figure 2 is a schematic cross-sectional view showing the purification of the in-line heat exchanger of the plate heat exchanger,

Figure 3 is a schematic cross-sectional view showing the circulation of the parallel heat exchanger,

4 is a view showing an example of the actual configuration of a parallel heat exchanger, (A) is an exploded state. (B) is the assembled state profile,

FIG. 5 is a perspective view showing the configuration of the applicant's pre-registered design 212841 as an example of the component plate of FIG. 4; FIG.

6 is a perspective view showing the configuration of the present invention,

7 (A) and (B) are path diagrams of hot water comparing the action of the pre-registered chairman and the component plate of the present application.

<Description of the code | symbol about the principal part of drawing>

1: construction plate (of heat exchanger)

H: H1, H2: Through hole (of component board)

R1, R2: guide rib

R3: Shielded Rib

4: Path rib

P: flow path

In order to achieve the above object, the component plate according to the present invention is characterized in that the path ribs arranged to form a V-shape as a whole bends in a wave form.

Accordingly, the surface area of the flow paths formed between the respective component plates is significantly increased, whereby the heat exchange efficiency is remarkably improved.

As a result, the present invention provides a parallel heat exchanger having a low fuel consumption and a small size.

Such specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

6 and 7, the component plate 1 according to the present invention is formed in a substantially rectangular shape, and through holes H; H1 and H2 are formed at four corners, respectively, in two through holes H in a diagonal direction. When the shielding ribs R3 are formed to overlap the component plates 1 with each other, the flow paths of the heated water-returned water and the direct water-hot water are alternately formed. Symbols R 1 and R 2 are induction ribs which respectively promote the flow of water between the layers.

In such a configuration, the path ribs 4 are arranged in a substantially V-shape, that is, in the form of a fishbone, as in the prior art, and each path rib 4 is bent in a waveform according to the present invention.

Here, the path ribs 4 are formed by deep drawing molding a blank of the component plate 1 together with other bent portions by means of a mold, which is formed by forming in the uniaxial direction. Even if the bend waveform is complex, there is no manufacturing problem.

As described above, the component plates 1 having the curved wave ribs 4 are alternately stacked in the opposite directions as shown in FIG. 8 and then bonded to each other to form a heat exchanger. Here, the bonding method may be performed by a brazing bonding method in which a thin plate of a thin copper-based bonding material is laminated between the component plates 1 and then charged and heated in a high temperature bonding furnace.

In order to explain the function and effect of the heat exchanger of the present invention configured as described above, FIG. 9 is shown in comparison with the flow path by the conventional component plate (U).

9 (A) and (B) show only one of the flow paths of both the hot water-returned water or the hot water-hot water, and the other flow path is the component plate 1 for the path shown. ) Is bounded by and becomes the form which meshes with each other.

First, as shown in FIG. 9 (A), the flow paths P ′ by the first application and the registration proposal of FIG. 5 are each other, and the flow ribs P4 of the component plates U are alternately arranged with each other. When viewed from the top to form a lattice (lattice) form intersecting with each other, three-dimensionally viewed the upper path (P1) of the trapezoidal cross section inclined to one side and the lower path (P2) of the inverted trapezoidal cross section inclined to the other side at They cross in communication with each other.

As such, the flow path P ′ is complicated, so that the flowing water flows in the turbulent state, and thus, the possibility of promoting heat exchange efficiency by changing the flow state such as the acceleration of turbulence is low.

In comparison with this, the flow path P of the present invention shown in Fig. 9B is similar to the conventional configuration of Fig. 9A in its basic form, but the flow path P is formed by the wave bend of the path rib 4. A bend is formed on the surface of).

As a result, the surface area of the flow path P is greatly increased as compared with the related art, and consequently, the turbulence of the flow is further increased, and as a result, the heat exchange efficiency is greatly improved.

According to the development test of the applicant carried out in the configuration step of the present application, in the case of the heat exchanger constituted by the component plate 1 of the present invention, the heat exchange efficiency of 10% compared to the heat exchanger by the pre-application and the registration component plate (U) of FIG. Improvements were recorded.

These results indicate that the present invention can not only reduce fuel consumption by 10%, but also reduce the size of the heat exchanger by 10% in the same heating capacity.

Therefore, the present invention has the effect of improving the heat exchange efficiency, thereby reducing the size and weight of the heat exchanger and reducing the fuel consumption rate, and is particularly suitable for use in domestic gas boilers.

Claims (1)

In the component plate constituting a parallel heat exchanger is a plurality of V-shaped ribs are arranged and stacked in plurality to alternately form a flow path of hot water-return water and hot water-hot water, Parallel path exchanger component plate, characterized in that the path ribs (4) are bent in a wave form.