RU2770082C1 - Layout of the unit for control and regulation of hot water supply parameters - Google Patents

Abstract

FIELD: heat engineering.

SUBSTANCE: invention relates to the field of heat engineering and can be used to regulate the parameters of hot water supply of buildings, houses or structures. The control and regulation unit for hot water supply parameters includes a heating supply pipeline branched off from it and a hot water pipeline connected in parallel, connected in series with the heating supply pipeline, and a control unit, while the first temperature measurement unit is installed on the section of the supply pipeline before the branch of the hot water pipeline, the second temperature measurement unit is installed on the hot water pipeline, the outputs of the temperature measurement units are connected to the inputs of the control unit, one pressure sensor is installed on each, the hot water supply pipeline and on the return pipeline, the outputs of which are connected to the inputs of the control unit, a control valve is installed on the hot water supply pipeline, the input of which is connected to the output of the electric drive, the input of which is connected to the output of the control unit, made with the possibility of generating control signals based on the readings of temperature measurement units and coolant temperature measurement units, a damping line with a check valve is connected between the hot water supply pipeline and the heating supply pipeline.

EFFECT: creation of an automatic control system for regulating the parameters of hot water, which provides reliable and long-term operation by ensuring a stable mode of regulating the pressure and temperature of the coolant.

1 cl, 1 dwg

Description

The invention relates to the field of heat engineering and can be used to control the parameters of hot water supply in heating systems of buildings, houses or structures.

The following technical solutions are known from the prior art.

A known diagram of the control unit for a hot water supply system (USSR Author's certificate No. 1495583, 07/23/1989), containing the return pipeline of the heating network, on which temperature sensors are installed before and after the first stage heater, associated with an electric drive that controls the operation of a control valve located on the supply pipeline heating network in front of the heater of the second stage, connected in series. The motorized valve is connected to the starter of the circulation pump. A temperature sensor connected to the control valve electric drive is installed on the hot water supply pipeline after the heater.

The disadvantage of this scheme lies in the significant complexity of implementation, which is associated with the need to use two heat exchangers, which negatively affects the speed of the water temperature control process.

The closest analogue of the patented solution is a device for regulating the parameters of hot water supply (RF patent No. 2499198, published on November 20, 2013), containing a supply line connected through a water temperature meter in the supply line and a key to the first input of the mixing chamber, to the second input of which through the meter the return line is connected to the return line, and the outlet of the mixing chamber through the hot water temperature meter and the flow meter is connected to the inlet of the hot water consumer, and the second outlet of the water temperature meter in the supply line is connected to the first input of the control unit, to the second input of which the hot water temperature setting unit is connected, the second output of the flow meter is connected to the third input of the control unit, the fourth input of the control unit is connected to the second output of the hot water temperature meter, the fifth input of the control unit is connected to the second output of the temperature meter s water in the return line, and the output of the control unit is connected to the second input of the key.

The disadvantage of the known solution is the lack of automatic stable mode for regulating the pressure of hot water supply.

The technical problem solved by the claimed system is the need to control the parameters of hot water and reduce the amplitude of jumps in the control parameters.

The problem is solved by introducing a damper line into the circuit, connected in parallel with the supply line, which ensures the reduction of pulsations and pressure overshoot, by placing pressure and temperature measurement units on the supply and return pipelines, which makes it possible to regulate the pressure according to the pressure value in the return pipeline, due to which overflow is excluded coolant, installation on the return pipeline of a regulator of direct action "to itself" with a check valve for stabilizing and increasing pressure.

The technical result of the claimed invention is the creation of an automatic control system for regulating the parameters of the coolant in the heating points of buildings and structures, which ensures reliable and long-term operation by providing a stable regime for regulating the pressure and temperature of the coolant in the supply and return pipelines.

The claimed technical result is achieved due to the design of the scheme of the control unit and regulation of the hot water supply parameters of the heating system, including the heating supply pipeline branched from it and connected in parallel to the hot water supply pipeline, connected in series with the heating supply pipeline, a water-jet elevator, a heating system and a return pipeline and a control unit , while the first temperature measurement unit is installed on the section of the supply pipeline up to the branch of the hot water supply pipeline, the second temperature measurement unit is installed on the hot water supply pipeline, the outputs of the temperature measurement units are connected to the inputs of the control unit, one sensor is installed on the hot water supply pipeline and on the return pipeline pressure, the outputs of which are connected to the inputs of the control unit, a valve is installed on the hot water pipeline, the input of which is connected to the output of the electric drive, the input to which is connected to the output of the control unit, configured to generate control signals based on the readings of the temperature measurement units and the heat carrier temperature measurement units, a damper line with a check valve is connected in parallel between the hot water supply pipeline and the heating supply pipeline.

In a particular case of the invention, on the heating return pipeline, a direct-acting regulator “to itself” is installed in parallel with it, together with a check valve.

Pressure measurement units located on the supply and return pipelines are necessary for the implementation of emergency situations prevention algorithms implemented in the control unit. The pressure measuring units determine the emergency situation on the supply pipeline outside the heating point, in the event of which the valve is closed with an electric drive. The unit for measuring the temperature of the coolant before branching the supply pipeline is necessary to monitor the temperature of the coolant entering the system from the source, and serves as an indicator for changing control modes, which may differ depending on the incoming parameters of the coolant. A damper line with a non-return valve reduces pressure pulsations in the DHW line.

Further, the solution is explained by references to the figure, which shows the hot water parameters control unit.

The automatic control system for hot water supply parameters includes a heating supply pipeline T1, which supplies the coolant from the heating network 1 to an individual heating point 3 of a building or structure, branched from it and connected in parallel to the hot water supply pipeline T5, connected in series with the heating supply pipeline, the return pipeline T4, leading to consumer 4, with a functionally built-in regulator of direct action "to itself" (12v), and control unit 6.

The first temperature measurement unit 8a is installed on the section of the supply pipeline up to the branch of the hot water supply pipeline, designed to monitor the temperature of the incoming coolant. This block serves as an indicator for changing control modes, which may differ depending on the incoming coolant parameters.

The second temperature measurement unit 3a is installed on the hot water supply pipeline, the outputs of the temperature measurement units are connected to the inputs of the control unit 6. The second temperature measurement unit is necessary to maintain the DHW parameters, pressure and temperature at a given level. Readings are taken by blocks 3b and 3a. So, when the temperature readings on block 8a are equal to the required temperature to maintain at 3a, DHW is regulated only by pressure. When the temperature readings on block 8a are higher than the required temperature to maintain at 3a, the DHW is regulated by pressure and temperature.

On the hot water pipeline and on the return pipeline, one pressure sensor 3g (on the return pipeline) and 3b (on the hot water supply pipeline) are installed, the outputs of which are connected to the inputs of the control unit 6. To ensure a stable control mode, the DHW pressure measured by unit 3b is maintained at the pressure level on the return pipeline of the heating point, measured by block 3g with the addition of an additional value in the amount of 0.1-1.0 kgf / cm ² . A regulator of direct action "after itself" 12b is also installed. This regulator is a direct-acting regulator that maintains the coolant pressure on the regulator outlet line at a pre-set level. Increases the smoothness of regulation of valves 12a by reducing the pressure drop across it.

A valve 12a is installed on the hot water supply pipeline, the input of which is connected to the output of the electric drive 13a, the input of which is connected to the output of the control unit 6. The valve 12a with the electric drive 13a regulates the pressure and temperature at a given level based on data received from the temperature measurement units 3a and 8a .

The control unit 6 generates control signals for the electric drive 13a according to a given algorithm based on the readings of the coolant pressure measuring units 3b and 3d and the coolant temperature measuring units 3a and 8a. In the main mode, the control unit 6 issues commands to close and open the control valve 12a to maintain the temperature 3a and pressure 3b at a given level. In an additional mode, when the temperature of the coolant measured by the block 8a is below the threshold value, the control unit 6 issues commands to close and open (valve) 12a to maintain the pressure 3b at a given level.

To reduce pulsations and overshoot the pressure in the DHW line, a damper line 14 was added, connected between the hot water supply pipeline and the heating supply pipeline, and a check valve 14a installed on this damper line. With short-term pressure surges on the DHW line (T5), excess pressure is discharged into the T3 line (the line of the supply pipeline to consumers). The smoothness of pressure regulation increases. Valve 14a prevents the coolant from flowing back from T3 to T5.

Since the pressure is controlled according to the value of the pressure in the return pipeline, there is no constant flow of the coolant. If necessary, to stabilize and increase the pressure in the return pipeline T2, a 12v direct-acting regulator "to itself" can be installed together with a 12g check valve. The 12v regulator is a direct acting regulator that maintains the coolant pressure in the inlet line to the valve at a pre-set level. Required to maintain the minimum DHW pressure. Creates a pressure reference for DHW control.

The control unit for hot water supply parameters operates in two modes: manual and automatic. The automatic mode is the main one, the automation maintains the specified parameters of the coolant entering the DHW line. Manual mode is an additional mode, it is necessary for debugging the system or manual intervention in the work. In manual mode, it is possible to independently give signals to open and close the valve 12a.

Claims (2)

1. A unit for controlling and regulating hot water supply parameters, including a heating supply pipeline, a hot water supply pipeline branched off from it and connected in parallel and a control unit connected to the heating supply pipeline, while the first temperature measurement unit is installed on the section of the supply pipeline before the hot water supply pipeline branch, a second temperature measurement unit is installed on the hot water supply pipeline, the outputs of the temperature measurement units are connected to the inputs of the control unit, one pressure sensor is installed on the hot water supply pipeline and on the return pipeline, the outputs of which are connected to the inputs of the control unit, a control valve is installed on the hot water supply pipeline, the input of which is connected to the output of the electric drive, the input of which is connected to the output of the control unit, configured to generate control signals based on the readings of the temperature measurement units and the unit ov for measuring the temperature of the coolant, a damper line with a check valve is connected between the hot water supply pipeline and the heating supply pipeline. 2. The unit for controlling and regulating the parameters of hot water supply according to claim 1, characterized in that a direct-acting regulator “to itself” along with a check valve is installed parallel to it on the heating return pipeline.

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