JPS61168795A - Grid for heat exchanger - Google Patents

Abstract

PURPOSE:To provide a grid that can be easily manufactured and has a high vibration resistance by performing the brazing for fastening after multiple elements that make up the grid are stackd in the direction of thickness and inserting a fastening rod into the drilled hole to connect respective elements. CONSTITUTION:The hole 1 in the top of the wave of respective elements 2 is shaped in the form of burring, and its outer diameter fits into the hole 1 in the bottom. The respective elements are stacked up in the direction of thickness with the tops and bottoms of the adjacent elements fit with each other, and fastened by inserting a fastening rod 3 into these holes 1. The surface of the respective elements 2 and fastening rods 3 are applied with solder plating in advance. By placing them in the oven to melt the solder, they are fixedly connected into one unit by brazing. The frame is mounted to the perimeter of the grid main body so connected, and is connected by welding etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat exchanger used in a dusty environment such as a civil engineering work site or a desert area, and to a grid for protecting the heat exchanger.

[Prior art and its problems]

When a heat exchanger used for construction machinery and the like blows air with a cooling fan, dust gets mixed into the air. Then,
The dust may damage the outer surface of the tube and cause the tube to break in a relatively short period of time. Therefore, in order to prevent the tube from being damaged by such dust, a grid 6 as shown in FIGS. 5 and 6 has been conventionally used. That is, the grid 6 is placed on the ventilation side of the heat exchanger 5.
is provided, and the grid 6 captures the dust in the air which is accelerated in the longitudinal direction and the circumferential direction by the cooling fan, and its kinetic energy is absorbed to prevent damage to the heat exchanger a5. However, such a grid has the drawback that it is extremely troublesome to manufacture because it involves combining plate materials in a lattice shape and welding them together.

Therefore, there has been a proposal in which elements are formed by forming plate materials into a trapezoidal wave shape, and the elements are laminated on each other in the thickness direction to form a mesh-like surface pattern. In this case, the brazing between each element was fixed and integrated. Although such a grid requires relatively few manufacturing steps and can be easily manufactured, according to experiments conducted by the present inventor, such a conventional grid has a drawback of lacking vibration resistance.

That is, when a vibration test was conducted, it was found that the vibrations were especially intense in the center of the grid, and the brazing material in that area became fatigued, causing the brazing parts of each element to separate.

[Summary of the invention]

Therefore, the present invention aims to eliminate the above-mentioned problems and provide a grid that has extremely high vibration resistance and is easy to manufacture.The gist of the present invention is as follows.

That is, the large number of elements 2 constituting the grid are formed by bending metal strips into trapezoidal or rectangular waveforms, and a plurality of perforated holes 1 are formed spaced apart from each other in the longitudinal direction. And such a large number of elements 2.2
are stacked in the thickness direction so that the crests and bottoms of the waves of adjacent elements are in contact with each other. In this state, the fastening rods 3 are inserted into each of the perforated holes 1 to fasten the elements together. In this state, they are integrally fixed by brazing.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described based on the drawings.

Fig. 1 is a partially enlarged view of Fig. 2, Fig. 2 is a schematic elevation view of the main part of the present invention, Fig. 3 is a partially enlarged perspective view of the element 2, and Fig. 4 is an explanation of the assembly of the present grid. It is a diagram.

In this embodiment, each element 2 of the grid bends a strip of steel plate into a trapezoidal wave shape as shown in FIGS. 3 and 1, and holes 1 are formed at the top and bottom of the wave, respectively. The perforation hole 1 at the top of the wave is formed in a burring shape, and its outer diameter is configured to match the perforation hole 1 at the bottom. Therefore, many such elements,
As shown in FIGS. 1 to 4, the elements are laminated in the thickness direction, the crests and bottoms of the waves of adjacent elements are fitted into each other, and the fastening rods 3 are inserted into the holes 1 formed therein. Then, it is fastened and fixed with a nut 4. Note that the surfaces of each element 2 and fastening rod 3 are solder-plated in advance. Therefore, by inserting them into a furnace in the state shown in FIG. 2 and melting the solder, they are integrally fixed by brazing. Therefore, in this grid, the fastening rod 3 itself serves as a positioning jig for brazing each element, and also serves as a component of the grid itself. Frames 7 and 8 are attached to the outer periphery of the grid body thus integrally formed as shown in FIG. 4, and the frames 7 and 8 are joined by welding or the like.

In this embodiment, the frame 7 constituting the side plate is provided with holes 9 at intervals of the fastening rods 3 as shown in FIG. It is welded as shown in Figure 1.

〔Effect of the invention〕

As is clear from the above description, the heat exchanger grid of the present invention has the following configuration.

That is, the large number of elements 2 constituting the grid are formed by bending metal strips into trapezoidal or rectangular waveforms, and a plurality of perforated holes 1 are formed spaced apart from each other in the longitudinal direction. And such a large number of elements 2.2
are stacked in the thickness direction so that the crests and bottoms of the waves of adjacent elements are in contact with each other. In this state, the fastening rods 3 are inserted into each of the perforated holes 1 to fasten the elements together. In this state, they are integrally fixed by brazing.

The grid of the present invention has the above configuration and has the following effects.

(1) In the grid of the present invention, the fastening rods 3 are inserted between each element, and they are integrally fixed together with the fastening rods 3 by brazing, resulting in a grid with great vibration resistance. . That is, in addition to brazing the elements together, they are integrated by the fastening rod 3, so
The bonding force between them is increased, and the vibration resistance is significantly improved.

(2) Also, the fastening rod 3 itself has a grid effect against dust, and when the dust collides with the fastening rod 3, the kinetic energy of the dust is absorbed, causing damage to the heat exchanger, especially its tubes. can be more effectively prevented.

(3) Also, according to this grid 2J node, the fastening rod 3 itself can be used as a positioning member during brazing, so the production of this grid is easy, brazing is performed reliably, and it is reliable. This has the effect that the grid can be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a partially enlarged view of Fig. 2, Fig. 2 is a schematic elevation view of the main part of the present invention, Fig. 3 is a partially enlarged perspective view of the element 2, and Fig. 4 is an explanation of the assembly of the present grid. 5 is a perspective view of a heat exchanger 5 having a conventional grid 6, and FIG. 6 is an enlarged perspective view of a main part of the conventional grid. 1...Drilling hole 2...Element 3...
Fastening rod 4... Nut 5... Heat exchanger
6...Grid 7.8...Frame 9...
- Hole 10... Welding Department Agent Patent Attorney Kubo 1) Takumi Figure 1 Figure 5 Figure 6

Claims (1)

[Claims] An element (2) formed by bending a metal strip into a trapezoidal wave shape or a rectangular wave shape, in which a plurality of perforated holes (1) are formed spaced apart from each other in the longitudinal direction, and a large number of the elements (2).
) and (2) are stacked in the thickness direction so that the tops and bottoms of the waves of adjacent elements are in contact with each other,
Each element (2) is inserted through each of the perforated holes (1).
), (2) a plurality of fastening rods (3) that are fastened to each other;
A grid for a heat exchanger, which is equipped with the following and is integrally fixed by brazing.