CN207003545U - A kind of water supply pump constant pressure frequency conversion speed-regulating control device - Google Patents

Abstract

The utility model discloses a water supply pump constant pressure frequency conversion speed regulation control device, which relates to the technical field of water pump constant pressure frequency conversion speed regulation control. A water supply pump set is installed inside the water storage tank, and the upper part of the water storage tank is connected to the water supply pipeline. The water supply pump set is mainly composed of two sets of water supply pumps, each set of water supply pumps is equipped with a filter at the front end, and one end of the two sets of water supply pumps passes through the water pipe. Connected to the end user, the water pipe between the water supply pump and the end user is provided with a hammer check valve, a butterfly valve, a pressure sensor and an electromagnetic flowmeter in sequence, and the other end of the two sets of water supply pumps is installed with an on-site pressure gauge and a check valve. Valves and filters, and the two sets of water supply pumps are controlled and connected to the controller through the frequency converter, and the controller is connected to the pressure sensor. According to the running state and pressure deviation of the pump, the speed increase and decrease, sleep and wake-up control of the water pump can be carried out in time, so as to realize the stepless continuous speed regulation control of multiple water pumps, reduce energy waste and prolong the operating life of the water pump.

Description

A water supply pump constant pressure frequency conversion speed regulation control device

technical field

The utility model relates to a water supply pump constant pressure frequency conversion speed regulation control device, which belongs to the technical field of water pump constant pressure frequency conversion speed regulation control.

Background technique

The current constant-pressure water supply of multiple water pumps mainly uses two methods of mechanical throttling and multi-stage speed regulation to regulate the flow. For the mechanical throttling method, this method is to adjust the flow by changing the characteristics of the system pipe network. During the change of water consumption, the power consumed changes very little, and the energy waste is serious; for the multi-level speed regulation method, this method requires Cooperating with the mechanical throttling mode adjustment, a certain amount of energy waste will also be generated. At the same time, the water pump will start and stop frequently, which will not only reduce the service life of the equipment, but also increase the occurrence of equipment accidents.

Utility model content

In view of the above problems, the technical problem to be solved by the utility model is to provide a constant pressure frequency conversion speed regulation control method for water supply pumps.

The utility model provides a water supply pump constant pressure frequency conversion speed regulation control method, which includes a water supply pump, a heavy hammer check valve, a butterfly valve, a pressure sensor, an electromagnetic flowmeter, an end user, a controller, a frequency converter, a check valve, a filter, a storage Water tank, local pressure gauge and water supply pipeline. A water supply pump group is installed inside the water storage tank. The upper part of the water storage tank is connected with the water supply pipeline. The water supply pump group is mainly composed of two groups of water supply pumps. A filter is installed, and one end of the two sets of water supply pumps is connected to the end user through a water pipe. The water pipe between the water supply pump and the end user is sequentially equipped with a hammer check valve, a butterfly valve, a pressure sensor and an electromagnetic flowmeter. The other end of the water supply pump is installed with a local pressure gauge, a check valve and a filter, and the two sets of water supply pumps are connected to the controller through the frequency converter, and the controller is connected to the pressure sensor.

Beneficial effects of the utility model: it can overcome the disadvantages of the prior art, and can timely increase and decrease the speed of the water pump, sleep and wake up control according to the operating state and pressure deviation of the water pump, and realize the stepless continuous speed regulation control of multiple water pumps , Stabilize the water supply pressure of the system, reduce unnecessary energy waste, prolong the operating life of the water pump, reduce the occurrence of equipment accidents, and improve the degree of automation control. Moreover, the device has the characteristics of simple structure and reliable performance, which can reduce energy waste and prolong the service life of the equipment.

Description of drawings

For ease of illustration, the utility model is described in detail by the following specific implementation and accompanying drawings.

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the electrical control principle structural diagram of the present utility model;

Fig. 3 is the control flowchart of the utility model.

Reference signs: water supply pump 1, weight check valve 2, butterfly valve 3, pressure sensor 4, electromagnetic flowmeter 5, end user 6, controller 7, frequency converter 8, check valve 9, filter 10, water storage tank 11. On-site pressure gauge 12, water supply pipeline 13.

detailed description

As shown in Figures 1-3, this embodiment adopts the following technical solutions: it includes a water supply pump 1, a weight check valve 2, a butterfly valve 3, a pressure sensor 4, an electromagnetic flowmeter 5, an end user 6, a controller 7, Inverter 8, check valve 9, filter 10, water storage tank 11, local pressure gauge 12 and water supply pipeline 13, water supply pump set is installed inside the water storage tank 11, and the upper part of the water storage tank 11 is connected with the water supply pipeline 13, so The water supply pump group described above is mainly composed of two sets of water supply pumps 1, each set of water supply pumps 1 is provided with a filter 10 at the front end, and one end of the two sets of water supply pumps 1 is connected to the end user 6 through a water pipe, and the water supply pump 1 and the end user The water pipes between 6 are provided with hammer check valve 2, butterfly valve 3, pressure sensor 4 and electromagnetic flowmeter 5 in sequence, and the other ends of the two sets of water supply pumps 1 are installed with local pressure gauge 12, check valve 9 and The filter 10, and the two groups of water supply pumps 1 are controlled and connected to the controller 7 through the frequency converter 8, and the controller 7 is connected to the pressure sensor 4 for control.

The working principle of this specific embodiment is: the system uses one controller 7 to control multiple frequency converters 8 at the same time, each frequency converter 8 corresponds to a water supply pump 1, and the given pressure setting value in the controller 7 is constant , in line with the constant pressure required by the system. At the same time, the controller 7 collects the on-site pressure value, compares it with the given value to calculate the deviation, and uses the selective PID control method internally to realize the speed adjustment of the water supply pump 1. When the external water demand is small, one water supply pump 1 can meet the water consumption at this time, and the controller 7 independently performs PID adjustment on this water supply pump 1 according to the pressure deviation, and the adjusted site pressure is basically equal to the set pressure, and the other water supply pumps 1 is in a dormant state; when the external water demand gradually increases and reaches the design capacity of the first water supply pump 1, the first water supply pump 1 keeps running at full load at 50Hz, and when it runs at full load for 5s, wake up the second pump at this time The first water supply pump 1 runs stably at 10Hz. As the external water consumption continues to increase, the second water supply pump 1 is used as a speed-regulating pump for pressure regulation, and the increase and decrease of the speed are adjusted according to the pressure deviation to keep the system pressure constant; The external water consumption gradually decreases. After the second water supply pump 1 keeps running at 10Hz for 60s, the controller 7 sleeps the second water supply pump 1 and adjusts the first water supply pump 1 as a speed-regulating pump. Adjust the speed of the water pump to keep the system pressure constant.

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (1)

1. A kind of 1. water supply pump constant pressure frequency conversion speed-regulating control device, it is characterised in that：It includes supply-water pump (1), weight check-valves (2), butterfly valve (3), pressure sensor (4), electromagnetic flowmeter (5), terminal temperature difference (6), controller (7), frequency converter (8), non-return Valve (9), filter (10), on the spot tank (11), pressure gauge (12) and water pipe (13), tank (11) is internal to be provided with Water supply pump group, tank (11) top are connected with water pipe (13), and described water supply pump group is mainly by two groups of supply-water pump (1) groups Into the front end of every group of supply-water pump (1) is provided with filter (10), and one end of two groups of supply-water pumps (1) passes through water pipe and end User (6) is connected, and weight check-valves (2), butterfly valve are disposed with the water pipe between supply-water pump (1) and terminal temperature difference (6) (3), pressure sensor (4) and electromagnetic flowmeter (5), and the other end of two groups of supply-water pumps (1) be provided with the spot pressure gauge (12), Check-valves (9) and filter (10), and two groups of supply-water pumps (1) are connected by frequency converter (8) and controller (7) control, and control Device (7) processed connects with pressure sensor (4) control.