RU205899U1 - Closed heating system filling device - Google Patents

Abstract

The utility model relates to hydraulic equipment, namely to modular pumping installations for maintaining pressure with an electric drive, and can be used to work as part of closed heating systems. The technical result consists in increasing the reliability of the system by eliminating the possibility of dry running when starting the pumps. The technical result is achieved by the fact that the filling device of the closed heating system includes a make-up manifold connected to the water source, centrifugal pumps installed in parallel hydraulic lines, the input of which is connected to the make-up manifold, and the outputs of the parallel hydraulic lines are connected to the outlet collector connected to the heating system ... According to the utility model, the inputs of the parallel hydraulic lines are connected by a suction manifold, the make-up manifold is connected to the suction manifold by means of a ball valve and a pressure switch and is made in the form of a separate pipeline. 2 c.p. f-ly, 4 dwg.

Description

The utility model relates to hydraulic equipment, namely to modular pressure maintenance installations with an electric drive, and is intended for use as part of closed heat supply systems.

From the prior art, there is a known installation for maintaining the pressure of heating systems, containing centrifugal pumps fixed on a single frame, combined with suction and pressure manifolds with connecting pipes. In this case, the supply pipeline contains a filter, manual balancing valves and solenoid valves through which it is combined with a make-up pipeline equipped with a liquid meter, a solenoid valve and a safety valve. The outlet from the manifold that connects the pipelines with the supply from the heating and make-up system and the inlet to the suction manifold are connected to a pressureless expansion tank (see patent RU 133259 U1, published 10.10.2013).

The disadvantages of the known device are the low reliability of the system due to the possibility of allowing the pumps to run dry at startup, as well as low productivity and insufficient reliability of the system.

A technical problem is the elimination of these disadvantages and the creation of a pumping unit for automatic pressure maintenance with a long service life. The technical result consists in increasing the reliability of the system by eliminating the possibility of dry running when starting the pumps.

The problem is solved, and the technical result is achieved by the fact that in the filling device of a closed heating system, including a make-up manifold connected to a water source, centrifugal pumps installed in parallel hydraulic lines, the input of which is connected to the make-up manifold, and the outputs of the parallel hydraulic lines are connected to the manifold the outlet associated with the heating system, according to the utility model, the inputs of the parallel hydraulic lines are united by a suction manifold, the make-up manifold is connected to the suction manifold by means of a ball valve and a pressure switch and is made in the form of a separate pipeline. A pressure sensor and a hydraulic accumulator tank with a damping function can be installed in the branch manifold, while check valves, shut-off valves and manual balancing valves are installed in parallel hydraulic lines after the centrifugal pumps. The device may contain an expansion tank, which is connected via a pipeline to the suction manifold through a check valve and a drain cock, and shut-off valves are installed at the inlet to each pump.

FIG. 1 shows a schematic diagram of the proposed device;

in fig. 2 - the wiring diagram of the device is presented;

in fig. 3 - the same, side view;

in fig. 4 - the same, top view.

The proposed device for filling a closed heating system is intended to be used as part of closed heating systems when filling them, further maintaining pressure or making up. For this, the device is completed as a module. Frame 1 contains two or three centrifugal pumps 2 with check valves 3, ball stop valves 4 at the inlet and ball stop valves 5 in the hydraulic lines behind pumps 2, balancing valves 6, solenoid solenoid valves 7 and 22, control cabinet 9, to which connected instrumentation and electric motors (no positions indicated) of pumps 2. Expansion tank 8 and damping accumulator tank 12 are mounted to the device. Each centrifugal pump 2, through a check valve 3, a ball valve 5, a balancing valve 6, is brought to a branch manifold 29 with a pressure sensor 11, a damping tank 12 and through a connecting pipe with a ball valve 18 to the heating system. The pressure sensor 11, located in the discharge manifold of the branch 29, provides a pressure feedback for its smooth adjustment or identification of an emergency condition.

In addition, the inlet suction manifold 15 of centrifugal pumps 2 is connected to the refill manifold 17 through a ball valve 13 and a pressure switch 14, which simplifies filling the system at start-up and makes it possible to control the absence of dry running of pumps 2. A pressureless expansion tank 8 is connected to the suction manifold 15 through the check valve 16 to compensate for the thermal expansion of the heat carrier, which can be used as a working fluid, for example, water. The ball valve 26 provides the ability to connect a non-pressure tank 8 to the suction manifold 15 of the pumping unit, while the balancing valves 6 provide the ability to equalize the flow of the working fluid when 2 or more pumps are connected in parallel into one collector outlet 29.

The outlet from the make-up manifold 17 combines the supply manifold pipes 10 with supply from closed systems, the make-up pipeline and the inlet to the suction manifold 15 connected to a pressureless expansion tank 8. In this case, the manifold 10 contains a filter 19, solenoid valves 7 and manual balancing valves 20, through which it is combined with a make-up manifold 17 equipped with a filter 21, a solenoid valve 22, a liquid meter 23 and a safety valve 24. Solenoid valves 7 and 22 are connected to the control cabinet 9 for manual or automatic control, a pressure sensor 11 for monitoring the pressure in the discharge manifold 29 at the outlet, a pressure limiting safety valve 24, which relieves pressure above a predetermined one to protect the expansion tank 8 from destruction, a pressure switch 14 for protection against dry running, a strain gauge sensor 31 for filling the expansion tank and a liquid flow meter 23.

The proposed device through the ball valve 18 is connected to the return from closed systems, and through the tee 28, the filter 21 and the ball valve 27 to the make-up system, and through the outlet pipe of the pressure header of the branch 29 to the entrance to the closed systems. The proposed device implements a system for filling the suction manifold 15, consisting of a ball valve 27, a filter 21, a ball valve 13 and a pressure switch 14 for automatic filling from the make-up pipeline to pumps 2. The system for air release, filling and filling control to the suction manifold 15 is formed by an expansion tank 8, ball valve 26 and check valve 16. The system for filling and venting the manifold 15 and pumps consists of a ball valve 27, a filter 21 and a pressure switch 14, combined into a single line with a make-up pipeline. This solution allows filling the system bypassing the expansion tank 8, keeping the suction manifold 15 uniting the pumps 2 under the fill, preventing the pumps from failing in the absence of working fluid in them. In addition, the simultaneous shutdown of ball valves 30 and 26, thereby disconnecting the expansion tank 8 from the device, makes it possible to transfer it to the pumping station mode from filling functions through ball valves 27 and 13, filter 21 from the make-up system and dry running control through a pressure switch 14. By installing check valves 3 and balancing valves 5, pumps 2 are protected from operation beyond their operating characteristics. The balancing valve 6 allows you to keep the hydraulic resistance and the flow rate of the working fluid at the outlet of the pump 2 within the range of the pump's operating characteristics. In addition, during the start-up of the pump 2, the protection of the system behind the outlet of the collector outlet 29 from water hammer is performed preferably by a damping tank 12 connected to it, which performs the purpose and function of the accumulator tank. For the proposed device, the absence of water hammer is a very important indicator, since with each water hammer there is a possibility of destruction of the hoses (hoses, pipelines) at the outlet of the device, which is an emergency.

The proposed device works as follows. At the beginning of operation, according to a signal from the control cabinet 9, the reading of the pressure sensor and the strain gauge sensor (not shown in the drawings) of the expansion tank 8 is monitored, if the signal level is less than the limit, the control cabinet goes into filling mode. For this, the solenoid valve 22 is opened. After reaching the preset level of the working fluid in the expansion tank 8, the solenoid valve 22 closes. The ball valve 26 opens and through the ball valve 25 air is released from the pipeline between the expansion tank 8 and the suction manifold 15. Then the ball valve 13 opens between the make-up pipeline and the suction manifold 15. At the signal of the pressure switch 14, about filling the suction manifold, start pumps 2, in system fill mode, allowed. According to the ratio of the set pressure and the actual pressure recorded by the sensor 11, using the controller of the control cabinet 9, pumps 2 are started in cascade or as needed. In this case, the second pump 2 and subsequent ones are started, or the second pump is turned off. Decrease or increase the rotational speed of the first pump in filling mode. Upon reaching the pressure setpoint, the ball valve 13 is closed. The control cabinet issues a command to switch to the pressure maintenance mode.

The number of standby and working pumps in the filling mode and in the pressure maintenance mode may be different for the same device. Due to the presence of several pumps, the proposed device allows their simultaneous or alternate switching on, allowing the equipment to work smoothly in a gentle mode or at maximum output, quickly reach the required operating pressure and maintain it at a given level. For this, it is possible to combine different numbers of working and standby pumps. In this case, the presence of interconnected manifolds 15, 17 and the corresponding fittings, as well as the connection of the make-up pipeline to the common supply manifold 10 ensures efficient filling of the system, rapid development and further maintenance of the operating pressure in it. In addition, deaeration of the filled system is realized by the mode of liquid circulation through the expansion tank 8 during operation.

Thus, the proposed device makes it possible to significantly increase the reliability of the system by reducing the overload of the pumps in the filling mode of the heating system, as well as to simplify the device by reducing the number of pumps in the device by increasing their performance.

Claims (3)

1. A filling device for a closed heating system, including a make-up manifold connected to a water source, centrifugal pumps installed in parallel hydraulic lines, the input of which is connected to the make-up manifold, and the outlets of parallel hydraulic lines are connected to a drain collector connected to the heating system, characterized in that that the inputs of the parallel hydraulic lines are connected by a suction manifold, the make-up manifold is connected to the suction manifold by means of a ball valve and a pressure switch and is made in the form of a separate pipeline. 2. The device according to claim 1, characterized in that a pressure sensor and a hydraulic accumulator tank with a damping function are installed in the outlet manifold, while check valves, shut-off valves and manual balancing valves are installed in parallel hydraulic lines after the centrifugal pumps. 3. The device according to claim. 1, characterized in that it contains an expansion tank, which is connected by a pipeline to the suction manifold through a check valve and a drain valve, and at the inlet to each pump there are shut-off valves.

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