RU20371U1 - INDIVIDUAL HEAT ITEM HEATING SYSTEM - Google Patents

Abstract

An individual heating unit heating system comprising supply and return pipelines, a coolant supply regulator, a water-jet elevator, a pump, heating devices, a jumper connecting the elevator receiving chamber to the return pipe, and a bypass line with a shut-off element connected in parallel with the pump, sequentially installed on the supply pipe characterized in that in the bypass line connected parallel to the pump, a check valve is installed in series with the normally open shut-off element.

Description

The heating system of an individual heating unit.

The solution relates to heat power devices and can be used in newly built and reconstructed heating units designed to connect heating, ventilation, air conditioning, hot water supply and technological heat-using installations of industrial and agricultural enterprises, residential and public buildings to heating networks.

A heat supply system is known (Energy Saving Magazine, No. 3, 1999, p. 3839), comprising a supply and return piping, a control valve, a tee, a mixing pump, heating devices and a jumper between the return piping and a tee, sequentially installed on the supply piping. The heat supply system is also provided electronic valve control equipment that takes into account changes in the temperature of outdoor air, indoor air, coolant temperature in the supply and return pipelines and has additional temperature settings at night and on non-working days. The mixing pump circulates the coolant in the heating system.

A disadvantage of the known heat supply system is the lack of reservation of the operability of the circulation circuit - a mixing pump, heating devices, a jumper connecting the receiving chamber of the elevator with the return pipe, since when the pump fails or the power supply fails, the hydraulic resistance of the circulation circuit increases and the coolant circulation decreases him. t

As a prototype, the authors adopted a heating system for an individual heating unit (utility model No. 16673, F24D3 / 00), containing a supply and return piping, successively installed coolant supply regulator, a water-jet elevator, a pump, and heating devices

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MnK7-F24D3 / 00

and a jumper connecting the receiving chamber of the elevator to the return pipe, moreover, bypass lines with a normally closed shut-off element are included in parallel with the coolant supply controller and / or pump.

The prototype system works as follows.

The control device receives signals from temperature sensors and provides a control action to the controller. The control action on the regulator is in such a way as to maintain the required temperature of the coolant entering the heating devices. With the regulator fully open, the pressure drop on it is small and the elevator operates in the usual mixing mode for it, injecting the coolant from the return pipe. If the degree of opening of the regulator is small, then due to a drop in pressure at the inlet to the elevator, the injection coefficient drops sharply and the circulation of the coolant through the heating devices with a mixture of the coolant from the return pipe provides a circulation pump. The opening of normally closed shut-off elements on bypass lines connected in parallel with the coolant supply regulator and / or the pump ensures the operation of the well-known heating system of an individual heat point in case of failure of the main elements of the circuit, as well as in the event of a power failure.

A disadvantage of the known heating system of an individual heating unit is the insufficient reservation of the operability of the circulation circuit - a pump, heating devices, a jumper connecting the receiving chamber of the elevator with a return pipe. In the event of a failure or emergency shutdown of the pump power supply, the hydraulic resistance of the circulation circuit increases, which significantly reduces the circulation of the coolant and in severe frosts will lead to freezing of the heating system.

EFFECT: functional separation in operation of the applied locking elements is provided.

The specified technical result is achieved by the fact that in the known heating system of an individual heating unit containing the supply and return pipelines, the coolant supply regulator, a water-jet elevator, a pump, heating devices, a jumper connecting the elevator receiving chamber to the return pipeline, and also a bypass line with a shut-off element connected in parallel with the pump, in a by-pass line in series with a normally open shut-off element return valve.

According to the proposal of the authors, there is now a functional separation in the operation of the locking elements and the check valve. A normally closed shut-off element in the bypass line connected in parallel with the coolant regulator opens when the latter is replaced or repaired. The shut-off element in the bypass line, connected in parallel with the pump, is open when the pump is operating, out of order or power failure, as it is selected normally open. It closes during repairs with equipment in the system after the pump, for example with heating devices. The non-return valve opens at any stop of the pump, when the pressure drop of the coolant on it increases. This allows you to increase the reliability of the heating system, as with. failure of the pump or interruptions in power supply increases the pressure drop of the coolant on the pump and the check valve instantly opens, ensuring uninterrupted operation of the heating system. And after that, at any time, you can repair or replace the pump.

The attached drawing shows an embodiment of the proposed

technical solution.

The heat supply system comprises a supply pipe 1, a return pipe 2, a coolant supply regulator 3, a water-jet elevator 4, a pump 5, heating devices 6, a bypass line 7 with a normally closed shut-off element 8, connected in parallel with the coolant supply regulator 3, sequentially installed on the supply pipe 1, and a bypass line 9 connected in parallel to the pump 5 and in which a normally open shut-off element 10 and a check valve 11 are connected in series. The return pipe 2 is connected by a jumper 12 to the input 13 of the receiving chamber of the elevator 4 to provide a mixture of coolant from the return pipe 2. The control device 14 is electrically connected to the regulator 3 and to the sensors 15, 16, 17 and 18, respectively, the outdoor temperature, the room, the coolant in the supply pipe 1 and the coolant in the return pipeline 2.

The system works as follows.

The control device 14 receives signals from temperature sensors 15, 16, 17 and 18 and gives a control action to the regulator 3. The control action on the valve 3 is such that it maintains the required dependence of the temperature of the coolant entering the heaters 6 on the outdoor (outdoor) temperature ) air. Moreover, depending on the parameters of the coolant in the external heat network, the controller 3 can have any degree of opening. With the regulator 3 fully open, the coolant pressure drop on it is small and the elevator 4 operates in its usual mixing mode. If the degree of opening of the regulator 3 is small, the pressure drop of the coolant on it is large, the elevator 4 leaves the water-jet pump mode and loses the ability to mix the coolant from the return pipe. In this case, the circulation of the coolant through the heating

6 is provided by the pump 5. The regulating device 14, having a control effect on the heat supply regulator 3, maintains the set room temperature using the sensor 16. In the normal mode of operation of the heating system, the shut-off element 8 is in the closed state, and the shut-off element 10 is in the open state . When the pump 5 is operating, the pressure of the coolant in the supply pipe after the pump is greater than the pressure of the coolant in the pipeline to the pump, so the check valve 11 is in the closed state. The opening of the locking element 8 occurs when the controller 3, control device 14, temperature sensors 15, 16, 17, 18 fail or power failure occurs. If the pump 5 fails or the power supply fails, the pressure in the supply pipe after it becomes less than the pressure of the coolant in the pipe before it due to an increase in the hydraulic resistance of the idle pump. The resulting pressure drop on the idle pump 5 is sufficient to open the check valve 11 and the coolant continues to flow into the heating devices 6. The amount of heat supplied to the heating devices 6 is determined by the operation of the water-jet elevator 4.

Thus, the proposed implementation of the heating system of an individual heating unit allows to increase the reliability and controllability of the system in the event of a pump failure or a power outage.

Claims (1)

An individual heating unit heating system, comprising supply and return pipelines, a coolant supply regulator, a water-jet elevator, a pump, heating devices, a jumper connecting the elevator receiving chamber to the return pipe, and a bypass line with a shut-off element connected in parallel with the pump, sequentially installed on the supply pipe characterized in that in the bypass line connected in parallel with the pump, a check valve is installed in series with the normally open shutoff element.