JP2008256340A - Multitubular heat exchanger with truncated cone shaped tube plate and spiral bent tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multitubular heat exchanger having a reduced size by changing the construction for increasing the heat transfer area and improving the heat transfer coefficient, because the specifications are not developed in another type than a multitubular type, although the number of heat transfer tubes to be mounted and the heat transfer area are determined by the size of a tube plate and the heat transfer coefficient is conventionally and disadvantageously lowered by an unnecessary space formed in an internal structure along with the increased size. <P>SOLUTION: In the small multitubular heat exchanger, many spirally bent heat transfer tubes 4 are mounted while utilizing the face which is widened by adopting a truncated cone shaped or cylindrical tube plate. This increases the heat transfer area and improves the heat transfer coefficient along with a more adequate gap between each of the heat transfer tubes and a body container 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a multi-tube heat exchanger in which the main body is reduced in size by devising the shapes of the tube plate and the heat transfer tube.

  Conventionally, a multi-tube heat exchanger has been used as a typical heat exchanger. Among these types of products, there are standardized domestic and foreign standards as design and production standards, and to date, they are widely used according to specifications according to pressure, temperature, and fluid type without changing the basic structure. Yes.

  In the conventional structure, the number of installed heat transfer tubes and the heat transfer area are determined by the size of the tube sheet, and it must be solved by increasing the size. Further, as a result of the configuration in which the heat transfer tube is mounted on the tube plate and the tube bundle is housed in the main body, when the inner surface of the main body is observed, it is surprising that there are many gaps that do not contribute to heat exchange between the main body and the tube bundle or between the tubes. It is an object to solve this inconvenience while relying on the basic characteristics of a multi-tubular system that can satisfy a wide range of usage conditions.

  In order to solve this problem, the invention according to claim 1 is to increase the mounting quantity and the heat transfer area with the expansion of the area by making the tube plate to which the heat transfer pipe is mounted into a truncated cone shape. The conventional tube sheet is π × (radius) × (radius) in terms of the plane area of the circular cross section of the main body. On the other hand, the surface area of the truncated cone is π × (slope) × (radius + small radius), and the truncated cone is represented by π × {1.5 × (radius)} × {1.5 × (radius)} = 2.25π. X (radius) x (radius), and it can be seen that the image can be enlarged more than twice.

  The invention of claim 2 is obtained by replacing the shape of the truncated cone with a cylindrical shape. The area of the cylinder is π × 2 × (radius) × (cylinder length), and assuming the dimensions of the tube plate inner diameter and the cylinder length, π × 2 × {0.8 × (radius)} × {1.25 X (radius)}, and it can be seen that it can be doubled. It has the same effect in that it increases the number of heat transfer tubes by expanding the area of the tube sheet. However, it is applied in an advantageous case such as a cylinder having a large diameter and being easier to manufacture than a truncated cone, and has the same purpose as the previous item.

Furthermore, the invention of claim 3 reinforces the effect of each of the preceding paragraphs using the property of fluid flow.
By making the heat transfer tube into a spiral bent tube, the gap between the main body container and the tube is optimized, and the flow of diffusion and gathering is changed at all points where the fluid flows, so that contact and heat transfer are balanced and precise Proceed to. As a result, the heat exchange amount can be increased.

  According to the present invention, the amount of heat exchange is increased as compared with a conventional multi-tube heat exchanger on the same scale, so that it is possible to reduce the size, thereby expanding the application.

FIG. 1 is an external perspective view in which a part of a multi-tube heat exchanger is provided, which is provided with a tube sheet formed by a frustum-shaped metal plate. FIG. 2 is a plan view of this portion, and a part thereof is omitted so that the tube plate can be seen.
Metal tube plates 3a and 3b each having a truncated cone shape are provided at both ends in the main body container 2. A plurality of metal tubes 4 spirally bent are attached to this tube sheet. The main body container 2 is provided with inlets and outlets for two kinds of fluids for heat exchange, and communicates from 5a to the outside 5b of the heat transfer tube 4. The other leads from 6a to the inside 6b of the heat transfer tube 4. In this way, each fluid flows inside and outside the heat transfer tube 4 to exchange heat.

  FIG. 3 shows the shape of the tube plate formed into a cylinder. In practice, this shape has a large diameter of the main body container 2 and the inner diameter of the cylindrical tube plates 7a and 7b, that is, a sufficient heat transfer tube accommodating opening diameter. Must be secured. Except the tube sheet, it is the same as the previous item.

  Next, the structure and function of the embodiment will be described with reference to the drawings. First, the structure of the main body container 2 is a hermetically sealed structure. However, this is also for the purpose of avoiding the complexity of the drawings in the description, and may be a system that can be easily disassembled depending on the convenience of use. One fluid having a temperature difference is guided to 5a in FIG. 1 and reaches the outside of the spiral heat transfer tube 4 through the opening of the tube plate 3a. This tube group is fitted with folded spirally bent tubes. Therefore, while optimizing the gap between the main body container 2 and the heat transfer tubes 4, the flow path is complicatedly changed by the mutual contact and bending of the tubes, so that the fluid has a complicated flow such as dispersion and aggregation. It discharges from 5b through this gap repeatedly indefinitely. The contact of the fluid rich in the direction change on the outer surface of the heat transfer tube generates an effect of making the heat exchange with the fluid flowing in the tube dense and uniform.

  The other fluid is guided to 6b in FIG. 1 and flows into each of the multiple heat transfer tubes 4 mounted on the tube plate 3b. Thus, heat exchange is performed with the fluid from the outside of the tube described in the previous section until the fluid reaches the tube plate 3a as the outlet. The fluid that has completed heat exchange from the tube plate 3a is collected and discharged from the opening 6a.

  The present invention makes it possible to use a small-sized multi-tubular heat exchanger by increasing the heat transfer area and making the structure characterized by enhanced heat transfer action. This adds particular significance to the fact that there is a specification that cannot be tolerated without a multi-tube system.

  It is one Example of the multitubular heat exchanger which provided the tube sheet shape-processed with the truncated-cone-shaped metal plate, Comprising: It is the external appearance perspective view which a part of main body was missing.   It is one Example of the multitubular heat exchanger which provided the tube sheet shape-processed with the truncated-cone-shaped metal plate, Comprising: It is the top view which lacked a part of main body upper part.   It is one Example of the multi-tube heat exchanger provided with the tube sheet shape-processed by the cylindrical metal plate, Comprising: It is an external appearance perspective view which a part of main body was missing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Main body container 3a Frustum-shaped (conical cone) tube plate 3b Frustum-shaped (conical cone) tube plate 4 Heat transfer tube 5a Fluid connection port 5b Fluid connection port 6a Fluid connection port 6b Fluid connection port 7a Cylinder Tube sheet 7b Cylindrical tube sheet

Claims (3)

A multi-tube heat exchanger characterized in that a tube plate formed by a truncated conical metal plate is provided. A multi-tube heat exchanger characterized in that a tube plate formed by a cylindrical metal plate is provided. A multi-tube heat exchanger characterized in that a plurality of metal tubes are bent into a spiral shape, and the bent tube group is mounted on a tube plate molded into a frustum or cylindrical shape.

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