RU73462U1 - HEAT EXCHANGER - Google Patents

Abstract

The utility model relates to heat exchangers, specifically to shell and tube heat exchangers, which can be used in energy, chemical industry and other areas of the national economy. The technical problem solved by the utility model is to reduce the deposition of hardness salts on the heat exchange surface, increase the reliability of the apparatus, increase heat transfer and improve environmental performance.

The problem is solved in that in the known heat exchanger comprising a housing 1 with nozzles and a cover 2, a pipe system, pipe boards, according to a utility model, one of the pipe boards 3 is located between the cover 2 and the housing 1, a membrane 4 is installed parallel to it with its center is a piezoelectric element 5 connected via a converter 6 to an AC source. 1 s.p. f-ly, 2 ill.

Description

The utility model relates to heat exchangers, specifically to shell and tube heat exchangers, which can be used in energy, chemical industry and other areas of the national economy.

A known heat exchanger comprising a housing with inlet and outlet nozzles, a pipe system and tube boards (RF patent No. 2282786, publ. 08/27/2006), as well as additional nozzles connected by a pipe with fittings to a tank of chemical solution, and the inlet and outlet nozzles heated The water is connected by pipelines to the fittings with the discharge pipe of the chemical solution pump, through which a part of the heat exchanger is flushed, while its other part is used in the technological process.

The disadvantage of this device is the impossibility of simultaneously using the entire volume of the heat exchanger, the presence of additional connecting pipelines and a tank, necessary for switching and washing the apparatus, as well as the deterioration of the thermal characteristics of the apparatus during operation due to the periodicity of cleaning the heat exchange surface from contaminants. The disadvantage is also the deterioration of environmental indicators due to the use of aggressive solutions.

The technical problem solved by the utility model is to reduce the deposition of hardness salts on the heat exchange surface, increase the reliability of the apparatus, increase heat transfer and improve environmental performance.

The problem is solved in that in the known heat exchanger containing a housing with nozzles and a cover, a pipe system, pipe

boards, according to the utility model, one of the tube plates is located between the cover and the body, a membrane is installed parallel to it with a piezoelectric element located in its center, connected via an converter to an alternating current source.

In addition, the heat exchanger is provided with gaskets located between the tube plate and the membrane and between the tube plate and the cover.

Figure 1 shows a longitudinal section of a heat exchanger, figure 2 - the shape of the membrane.

The heat exchanger comprises a housing 1, a cover 2, a tube plate 3 located between the cover 2 and the housing 1, a membrane 4 mounted parallel to the tube board 3. In the center of the membrane 4, a piezoelectric element 5 is connected, connected via an converter 6 to an AC source. Between the tube plate 3 and the membrane 4, as well as between the tube plate 3 and the cover 2, there are gaskets 7 that provide sealing of the connection and the necessary clearance between the membrane 4 and the tube plate 3, sufficient for unobstructed oscillation of the membrane 4. Figure 1 shows one tube 8 from the pipe system. The membrane 4 is made of elastic material in the form of a circle (figure 2) with holes 9 for the passage of tubes of the pipe system and holes 10 for attachment to the housing 1 of the heat exchanger.

The device operates as follows. A periodic electrical signal from the transducer 6 to the piezoelectric element 5 leads to oscillations of the membrane 4. The oscillation frequency of the membrane 4 is controlled by changing the electric signal supplied to the piezoelectric element 5. Fluctuations in the membrane 4 lead to fluid oscillations around the tubes 8 of the pipe system, thereby exfoliating deposits the walls of the tubes.

This device allows to reduce deposits of hardness salts on the heat exchange surface of the tubes and thereby reduce

thermal resistance between the heat carriers in the heat exchanger and increase the duration of the intervals between shutdowns of the system in which the heat exchanger is installed to clean its heat exchange surface. At certain vibrational frequencies of the membrane, an increase in heat transfer is achieved, which leads to an increase in the transmitted thermal power. The absence of aggressive solutions for the cleaning process improves environmental performance during the operation of the proposed heat exchanger.

Claims (2)

1. A heat exchanger comprising a housing with nozzles and a lid, a pipe system, tube boards, characterized in that one of the tube plates is located between the lid and the housing, a membrane is installed parallel to it with a piezoelectric element located in its center and connected via an converter to an AC source. 2. The heat exchanger according to claim 1, characterized in that it is provided with gaskets located between the tube plate and the membrane and between the tube plate and the cover.