RU1827506C - Heat-and-moisture exchanger - Google Patents

Abstract

Use: in conditioning systems for hypo-storage storages of agricultural products. SUMMARY OF THE INVENTION: Capillary-porous plates form channels for air flow and are immersed in a liquid sump. The ends of the plates are inserted into the slots of the bottom of the bath with liquid. The pipe is introduced by the lower and upper ends into the pan and bath. A pressure air line with a differential pressure valve is connected to the atmosphere at one end, and at the other end it is introduced into the lower end of the pipe below the liquid level in the sump. An air duct connects the airspace for the bathtub to the start of the airflow passages. The upper end of the pipe is brought to the liquid level in the bath. A pair of closely spaced electrical contacts are installed at the bottom of the pipe. 2 ill.

Description

The invention relates to a ventilation and air conditioning technique and, in particular, can be used in conditioning systems of hypobaric storage facilities for agricultural products.

The purpose of the invention is to increase the efficiency and reliability of the heat exchanger under conditions of reduced pressure of the medium being treated.

With the proposed implementation of the device, a positive effect is achieved as follows

When the liquid level in the pan rises from the sensor to the secondary device, which controls the differential pressure valve, a signal is received, as a result of which the valve opens and the air flows due to the pressure differential inside the heat exchanger and in the environment, rushes up the pipe, carries the portion of the liquid contained therein, which then flows into the upper bath. The liquid level in the sump is reduced and a shut signal is sent to the valve. The pipe is filled with a new portion of liquid. In the event that the next portion of the liquid is not fast enough into the pipe, close contacts mounted inside the pipe are included in the control circuit. When wetted with liquid, the air valve opens and a portion of the liquid is ejected through the pipe into the upper bath; when they are drained, the signal from the level sensor does not pass to the secondary device. Opening and closing the valve will occur until the liquid level in the sump is again reduced to normal. The fluid, entrained in air, enters the bath with slots for the plates and enters them to moisturize. Due to leaks, fluid flows through slots along the surface of the plates into the pallet, resulting

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whereupon the bathtub is again empty and an excess of liquid appears in the pan. When the liquid level reaches the contact of the level sensor, the process of transferring air into the bath of portions of the liquid coming from the pan is repeated. As a result, the efficiency and reliability of the heat and moisture exchanger increase as the process medium is evacuated. Thus, the presence of a pressure air line with a pressure regulating valve A, which is connected at one end to the atmosphere and the other below the liquid level in the sump, into the lower end of the pipe discharged by the overflow liquid in the bath, the duct connecting the air space above the bath with liquid with the beginning of the channels for the air flow, the regulator of the liquid level in the sump, which controls the operation of the differential pressure valve, close electrical circuits installed in the lower part of the pipe, allows increase in efficiency and reliable operation of the heat and moisture exchanger under conditions of reduced pressure of the treated medium.

Figure 1 presents a diagram of a heat exchanger, figure 2 is a diagram of the switching of the main electrical circuits of a heat exchanger.

The heat and moisture exchanger (see Fig. 1) contains capillary-porous plates 1 forming channels 2 for air flow, a tray 3c with liquid, into which capillary-porous plates 1 are immersed, a bath 4 with liquid with slots in the bottom into which the upper the ends of the plates 1, the pipe 5, introduced by the lower and upper ends into the pan 3 and the bath 4. The heat exchanger also contains a pressure air line b with a differential pressure valve 7, which is connected to the atmosphere with one end and the lower end of the pipe 5 is lower than the liquid level in pallet 3, air duct 8 connecting the air space under the important 4 with the liquid With the beginning of channels 2 for the air flow (Fig. 1 is shown conventionally), a level 9 regulator with three level sensors, which controls the operation of the differential pressure valve 7. The upper end of the pipe 5 is led out above the liquid level in the bath 4. In the heat exchanger in the lower part of the pipe 5, a pair of nearby electrical contacts 10 is installed. The structure of the switching circuit (see figure 2) includes a switch 11 of the kind of work, with which you can either include in the switching circuit a pair of nearby electrical contacts 10 (position 1-2), or turn them off from the switching circuit.

A heat and moisture exchanger under conditions of reduced pressure of the medium operates as follows.

Air under reduced pressure is supplied (by known methods) to the channels 2 formed by capillary-porous plates 1 for heat and heat treatment. Due to the capillary effect, the plates 1 are moistened with liquid from below from the tray 3 and from above from the bath 4 under the action of gravity. In the latter case, due to surface tensile forces and

5 to adhere to the material of the plates 1, a thin film of liquid flows only onto the plates 1 and does not spill between them. As a result of heat and moisture exchange between the liquid and the flowing air, part of the liquid is absorbed by the air. (A certain amount of liquid from the bathtub with 4 film drains into the pan 3. Over time, in the pan

The level of the liquid may increase, its excess is created. Plate 2 is flooded with liquid5, which can lead to a violation of the regime of heat-moisture treatment of air and to the failure of the heat and moisture exchanger as a whole. In this case, when the upper sensor of the regulator is flooded

0 level 9, its control unit is activated and the differential pressure valve 7, its electromagnetic coil receives voltage - the differential pressure valve 7 opens. From the atmosphere through the valve

5 differential pressure 7, the pressure air line 6 enters the pipe 5 air. The flow of air captures the liquid 4 located in the pipe 5 and with it enters the bath 4. In the bath 4, the air is separated from

0 liquid and through the duct 8 enters the beginning of the air ducts 2. Then this air is mixed with the air flow flowing here and enters the heat-moisture treatment and then to the object

5 air conditioning, etc. The liquid from which the air has separated accumulates in the bath 4 and then flows onto the plates 1, again participating in the heat-moisture treatment of the air flow. As fluid is pumped through pipe 5 from sump 3 to the bath

4, the liquid level in the pan 3 decreases and when a predetermined level is reached (the location of the lower sensor of the level regulator 9), the control unit of the level 5 regulator 5 disconnects the voltage from the differential pressure valve 7 and the latter blocks the flow of air from the atmosphere into the pipe 5. Pumping the liquid stop from the pan 3 to the bath 4 Since the upper end of the pipe 5 is discharged above the liquid level of the bath 4, the liquid is not poured back from the bath 4 into the pan 3 through the pipe 5. The liquid flows only onto the plates 1. In considered ohm operation teplovlagoobmennika embodiment the selector switch 11 is set in position 1-3, when the work control valve differential pressure is effected only immediately prior regulator 9:

In a number of cases, including the excess of the pressure of the inflowing air above the pressure of the fluid flowing into the pipe 5, the leakage of fluid into the pipe 5 through the gap between the pressure air pipe 6 and the pipe 5 is difficult. When valve 7 is activated, the air flow from the atmosphere ejects the liquid located in the pipe 5 under the upper end of the pressure air line 6 into the bath 4 and then into the space under the bath 4 only air can enter - the pumping of liquid from the pan 3 into the bath 4 is stopped.

In this case, the switch of the type of work 11 is set to position 1-2, thereby connecting a pair of nearby electrical contacts 10 to the control circuit of the differential pressure valve 7. Now, when the maximum specified level of liquid in the pan 3 is reached and the regulator of level 9 is triggered, power is supplied to the electromagnetic coil the differential pressure 7 is supplied through nearby electrical contacts 10. The operation of the heat and moisture exchanger in this case occurs as follows. When you open the differential pressure valve 7, air enters through the pressure air line b into the pipe 5. As previously discussed, the liquid from the bottom of the pipe 5 together with the air enters the pipe 5 up into the bath 4. But after the first portion of the liquid is ejected from the bottom of the pipe 5 from Due to the difficulty of getting fluid there from the pan 3, only air is present there. In this case, when there are a pair of closely spaced contacts 10 in the air, the differential pressure valve 7 opens, the last one closes, the flow of air to the main line stops, and pipe 5 leaks fluid from the sump 3. The liquid level rises to a pair of nearby electrical contacts

10. After wetting the electrical contacts 10 with liquid, current flows again through them and the electromagnetic coil is powered by the differential pressure valve.

5 sec Through the valve 7 and the pressure air line 6, air again enters the pipe 5, which throws another portion of the liquid into the bath 4 and so on. The process of transferring the liquid from the pan 3 to the bath

0 4 continues. Upon reaching a predetermined liquid level in the pan 3, the control unit of the level 9 regulator disconnects the voltage from the differential pressure valve -7. A new boost cycle begins

5 level of liquid in the pan 3.

The liquid level in the bath 4 can be adjusted using known methods, in particular a float valve, blocking the flow of fluid from

0 external source.

The proposed heat and moisture exchanger can be used in air conditioning systems of hypobaric storages of agricultural products and can improve the efficiency of heat and moisture treatment with ventilating air.

Claims (1)

SUMMARY OF THE INVENTION A heat and moisture exchanger comprising a capillary-porous plate forming ducts for air flow, a liquid tray in which capillary-porous plates are immersed, a liquid bath with slots in the bottom into which 5 the upper ends of the plates, and the pipe introduced by its lower and upper ends into the pan and bath, characterized in that. what. in order to increase efficiency and reliability under conditions of reduced pressure of the medium being treated, it is additionally equipped with a pressure air line with a differential pressure valve, one end connected to the atmosphere, and the other introduced into the lower 5, the end of the pipe is below the liquid level in the pan, with an air duct connecting the air space above the liquid bath to the beginning of the air flow channels and a liquid level regulator in the pan. 0 in this case, the upper end of the pipe is brought out above the liquid level in the bath, and a pair of closely spaced electrical contacts are installed in the lower part of the pipe. T-j fe / $. 1 10 G / 7T // "X G qw & l