RU74697U1 - SPIRAL HEAT EXCHANGER - Google Patents

Abstract

1. A spiral heat exchanger comprising a housing with inlet and outlet pipes, a two-channel spiral of sheets, parts fixing the distance between the sheets of the spiral, stops placed in the channels on both sides of the spiral, sealing the ends of the spiral, covers with gaskets on the ends of the spiral, characterized in that the details fixing the distance between the sheets of the spiral are made in the form of zigzag spacers placed along the entire spiral. 2. The spiral heat exchanger according to claim 1, characterized in that the stops laid in the channels on both sides of the spiral are placed on the lateral edges of the extreme rows of zigzag spacers. The spiral heat exchanger according to claim 1, characterized in that the space in the channels between the ends of the spiral and the stops is filled with a sealing mass to prevent the flow of coolant from one channel to another. The spiral heat exchanger according to claim 1, characterized in that the casing is made of two half-cylinders, fastened to each other after installing the spiral. The spiral heat exchanger according to claim 1, characterized in that in heat exchangers operating on contaminated working media, zigzag spacers are provided with turbulators made on the vertical and / or horizontal edges of the zigzag spacers.

Description

The utility model relates to devices for conducting heat exchange processes and can be used in chemical, food and oil refining and other industries.

In various industries, heat exchangers are widely used, which serve to transfer heat from one medium to another through a wall of heat-conducting material that separates these media. Among them are shell-and-tube, lamellar, spiral, coil, etc. heat exchangers that differ in the design of the heat exchange surface (Pat. RF No. 2121122, IPC F28D 7/00; No. 2151991, IPC F28D 3/02; No. 2156423, IPC F28D 3/00, 09/20/2000; No. 2166716, IPC F28D 3/00).

Known spiral heat exchanger containing a cylindrical body in which are placed heat transfer surfaces formed from elements representing a pair of spiral-shaped walls welded in pairs along the contour, forming an internal spiral slotted channel. In a section perpendicular to the axis of the apparatus, spiral-shaped walls form a heat-exchange surface in a spiral of Archimedes. The internal spiral cavities of the heat-exchange elements communicate with the collectors of the input and output of one medium, and the external with the collectors of the input and output of another medium (V.V. Burenin. New recuperative heat exchangers for oil refining and petrochemical industries. "Oil Refining and Petrochemicals", No. 3, 2005 pg. 44-45).

Known spiral heat exchanger containing channels for the working environment, made of rolled tape, in one of which are pins equipped with turbulators made of tape, twisted in the longitudinal direction (RF Patent No. 2156423, IPC F28D 7/04; 09/20/2000 g) .

Known spiral heat exchanger containing two slotted channels for the passage of coolants formed by two sheets folded into a spiral with elements of remote location, external and internal collectors and mechanical seals (RF Patent No. 2306517, IPC F28D 7/04; 04.10.2006).

A common drawback of these technical solutions is the complexity of the design, the low-tech manufacturing of the heat exchanger, as well as the increased weight due to the presence of complex sealing units, which accounts for the high manufacturing cost.

Known spiral heat exchanger containing a housing with inlet and outlet pipes, a two-channel spiral of sheets, parts that fix the distance between the sheets of the spiral, stops placed in the channels on both sides of the spiral, sealing the ends of the channels, covers with gaskets on the ends of the spiral (N.V. Baranovsky and other Plate and spiral heat exchangers. Engineering, M. 1973, S. 262-269).

By the combination of similar features, this spiral heat exchanger is closest to the inventive spiral heat exchanger and is taken as a prototype.

However, the heat exchanger has several disadvantages: in it, pins welded to one of the sheets are used as parts fixing the distance between the sheets of the spiral and to create the rigidity of the sheets. The spiral is sealed using stops made of a tape inserted into the channel welded to the edges of the sheets. (N.V. Baranovsky and others. Lamellar and spiral heat exchangers. Mechanical Engineering, M. 1973, p. 263-264, fig. 142, options a, b, c, d). This leads to a significant complication of the manufacture of the heat exchanger, especially in the case of

its use for heat carriers with high temperatures (above 400 ° C) and in aggressive and corrosive environments. In these cases, the heat exchanger requires the use of alloy steels and leads to considerable complexity and high cost when welding parts. The sealing of the ends only with a gasket (var. In) or a U-shaped cuff (var. G) does not prevent the possibility of overflow of the coolant from one channel to another. In addition, the heat exchanger housing is made of a single piece in the form of a cylinder, which makes it difficult to install the spiral assembled in a single unit into the housing.

Utility Model Task:

- simplification of the design of the heat exchanger, and as a result - reducing the cost of its manufacture;

- the exception of the flow of coolant from one channel to another.

The problem is solved in that the spiral heat exchanger contains a housing with inlet and outlet pipes, a two-channel spiral of sheets, parts that fix the distance between the sheets of the spiral, stops placed in the channels on both sides of the spiral, sealing the ends of the channels, covers with gaskets along the ends of the spiral.

The spiral heat exchanger further includes:

- details fixing the distance between the sheets of the spiral, made in the form of zigzag spacers placed along the entire spiral;

- stops laid in channels on two sides of the spiral, placed on the lateral edges of the extreme rows of zigzag spacers;

- a sealing mass filling the space in the channels between the ends of the spiral and the stops to prevent the flow of coolant from one channel to another;

- a housing made of two half-cylinders, fastened to each other after installing the spiral;

- in heat exchangers operating on contaminated working media, zigzag spacers are equipped with turbulators made on the vertical and / or horizontal edges of the zigzag spacers.

The essence of the utility model is illustrated by drawings, where:

figure 1 is a longitudinal section of a heat exchanger,

figure 2 - remote element B in figure 1.

figure 3 is a section AA in figure 1;

figure 4 - remote element In figure 2

figure 5 - zigzag spacers;

figure 6 - heat exchanger housing assembly.

The spiral heat exchanger consists of a housing 1, a spiral 2, wound from two sheets 3 and 4 onto the core 5. Housing 1 consists of two half cylinders 1.1 and 1.2 and flanges 1.3. Between sheets 3 and 4 of the spiral 2, zigzag spacers 6 are installed (Figure 2). Zigzag spacers 6 are used in two types - ordinary spacers 6.1 (Fig.5a) and spacers with turbulators 6.2 (Fig.5b)

The core 5 is divided into two cavities 5.1 and 5.2 (figures 1, 3). The inner edge of the sheet 3 is welded to the longitudinal cylindrical wall of the core cavity 5.1, and the inner edge of the sheet 4 is welded to the longitudinal cylindrical wall of the core cavity 5.2, two channels 7 and 8 are formed in a spiral. The outer edge of the sheet 3 is welded to the longitudinal edge of the semicylinder 1.1, and the outer edge of the sheet 4 is welded to the longitudinal edge of the half cylinder 1.2. In this case, exits from

channels 7 and 8 (figure 3), which are welded inlet and outlet pipes 9 and 10 of the housing 1 (figure 4).

As the spiral 2 is folded (Fig. 2), zigzag spacers 6 are installed between the sheets of the spiral 3 and 4, and the spacers 6.3, which are closest to the edges of the sheets, are installed one above the other, the remaining spacers are advisable to be placed in adjacent turns of channels in a checkerboard pattern. This sets the channel width.

The spiral 2 wound on the core 5 is covered by half cylinders 1.1 and 1.2 (Figs. 1, 3, 6), fasten them together along the entire length and weld the flanges 1.3, creating a single assembly of the housing 1 and spiral 2.

On the lateral edges of the extreme rows of zigzag spacers 6.3 (figure 2) in the channels 7 and 8 are placed stops 11, for example, in the form of a wire. The channels closest to the ends of the spiral (sheet edges) are filled with a sealing mass 12, and the depth of the stops 11 and the filling of the ends of the channels with a sealing mass 12 are selected from the mandatory condition for excluding the flow of coolant from one channel to another. A gasket 13 is laid on the ends of the spiral 2 in the form of a sheet of sealing material, pressed by the flanges 14 to the ends of the spiral 2 and to the sealing mass 12 filling the channels 7 and 8. Under the pressure of the flange 14, the gasket 13 and the sealing mass 12 in the channels 7 and 8 form a uniform seal.

As a sealing material for heat exchangers operating in aggressive or corrosive environments and / or high temperatures, thermally expanded graphite, or products from graphitized asbestos, or other materials with similar properties, are used.

To connect with the core cavities 5.1 and 5.2 (FIG. 1), holes are made in the central part of the flanges 14. The inlet and outlet pipes 15 and 16 are connected to the flanges 14.

Thanks to this design of the heat exchanger, reliable separation of the channels is ensured and the flow of the coolant from one channel to another is excluded.

In heat exchangers operating on contaminated working media, zigzag spacers 6.2, equipped with turbulators 6.2.2, made in the form of short protrusions to create a turbulent in the channel, are installed in the channels through which the contaminated medium is supplied, to reduce the sedimentation of suspended particles on the walls of the channels in the spiral 2 flow.

The distance between the spacers 6 should be selected depending on the strength characteristics of the metal from which the sheets are made, and the pressure drop of the coolants in the channels.

To clean the channels of possible deposits, it is necessary to remove the sealing mass 12 and the stops 11 from the ends of the spiral 2 from the ends of the channels and clean the channels with narrow scrapers.

Claims (5)

1. A spiral heat exchanger comprising a housing with inlet and outlet pipes, a two-channel spiral of sheets, parts fixing the distance between the sheets of the spiral, stops placed in the channels on both sides of the spiral, sealing the ends of the spiral, covers with gaskets on the ends of the spiral, characterized in that the details fixing the distance between the sheets of the spiral are made in the form of zigzag spacers placed along the entire spiral. 2. The spiral heat exchanger according to claim 1, characterized in that the stops laid in the channels on both sides of the spiral are placed on the lateral edges of the extreme rows of zigzag spacers. 3. The spiral heat exchanger according to claim 1, characterized in that the space in the channels between the ends of the spiral and the stops is filled with a sealing mass to prevent the flow of coolant from one channel to another. 4. The spiral heat exchanger according to claim 1, characterized in that the casing is made of two half-cylinders, fastened to each other after installing the spiral. 5. The spiral heat exchanger according to claim 1, characterized in that in heat exchangers operating on contaminated working media, zigzag spacers are provided with turbulators made on the vertical and / or horizontal edges of the zigzag spacers.