SU1204909A1 - Heat exchanger - Google Patents

Description

The invention relates to heat exchangers, mainly for ventilation systems 1 for residential and industrial premises.

The purpose of the invention is to intensify heat exchange in the presence of phase transformations of the heating medium in the annular space and prevent the deposition of its solid phase on the surface of the pipes, as well as increasing the manufacturability and operational reliability of the heat exchanger.

On fpg. 1 shows a heat exchanger; general view; in fig. 2 is a view A of FIG. one; in fig. 3 is a view B in FIG. one; in fig. 4 - pipe mounting in a tube plate (section B-B in FIG. 1).

Tei. The exchanger contains a casing 1 in which a bundle of pipes 4 is fixed in pipe boards 2 and 3, through which the heated medium (cold supply air) enters. The fastening of the pipes 4 is effected by means of sealing pads 5, made in the elastic elastic cuffs placed around each pipe 4. In the casing 1, an additional sleeve is built in the bypass channel 6 of the heated medium with the valve 7, having new rotating blades, the position of which is adjusted by the actuator 8 through t gi 9 but a signal from thermopath 10, mounted on the wall of one of the beam pipes at the point of entry of the heated medium and output of the heating medium of warm unperturbed air.

In the transverse m tube bundle 4 on the casing 1, the inlet 1 1 and the outlet 12 are made with flanges to provide a flow of heating medium.

The pipes 4 are fixed in the tube plate 2, located on the input side of the heated medium, with variable steps, increasing during the heating medium from 0.5 S to 2.0 5, where S is a fixed njar fixing of the pipes 4 in the pipe board 3 on the output side of the heated medium.

Tenloobpik works as follows.

The heat exchanger is built into the appropriate ductwork of the intake and exhaust systems of the building so that the intake of cold intake air occurs

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From the side of the tube plate 2, in which the pipes are fixed with variable schagom. system.

The cold supply air entering through the bundle of pipes 4 is heated through their walls by a warm, removed air from the exhaust system passing through the heat exchange variable in the transverse direction from the inlet 1 1 to the outlet 12 orifices. Fixing the pipes 4 in the tube plate 2 with variable air flow, increasing along the exhaust air flow, allows to increase the flow rate of the tube bundle in the zone of the heat exchanger, which has the coldest supply air through the pipes 4 It cools the already partially cooled exhaust air passing through the annular space, which leads to an intensification of heat exchange from the side of the medium and a deeper cooling of the latter.

In the zone with the smallest schm.ft of the tube bundle 4, the heat exchange is intensified due to a decrease in the temperature of the pipe walls from the side of exhaust air to the condensation temperature of the water vapor contained in the letters. By maintaining a constant speed of movement of the cold supply air (due to the constant section of the tube bundle 4 as a whole), a deeper cooling of the exhaust air is achieved without icing up the tube bundle 4. Apart from the danger of icing, the flow of cold supply air decreases tube bundle 4 by opening the valve 7 of the bypass channel 6 at the command of the thermocouple 10. Fixing the tube 4 bundles in the tube snaps 2 and 3 by means of elastic cuffs 5 allows the manufacture, transport heat exchanger assembly, as well as the replacement of pipes 4 in a noochka with the least costs: moreover, it becomes possible to use pipes made of different materials.

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in-in

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VNIIPI Order 8514/39 Branch PPP "Patent, i

Circulation 690

Uzhgorod, st.

Subscription Project, 4

Claims (2)

1. A HEAT EXCHANGER comprising a casing with a tube bundle for a heated medium fixed in tube boards by means of gaskets, characterized in that, in order to intensify FIG. / heat transfer in the presence of phase transformations of the heating medium in the annulus and preventing its solid phase from precipitating on the surface of the pipes, the latter in the tube board located on the inlet side of the heated medium, are fixed with a variable pitch, increasing along the heating medium from 0.5 S to 2 , 0 S, where S is the constant step of fixing the pipes in the tube plate from the outlet side of the heated medium, and the bypass channel of the heated medium with a valve is additionally built into the casing. 2. Heat exchanger according to π. 1, characterized gem. that, in order to improve manufacturability and operational reliability, the gaskets are made in the form of elastic cuffs placed around each pipe. <g