SU779522A1 - Device for controlling pumping plant - Google Patents

Description

The invention relates to pumping installations and can be used in water supply, in particular, in automatic pump control systems. A device for controlling two pumps, including control sensors, command appliances and control units 1, is known. This device does not provide automatic alternation of pump operation for the purpose of their equal wear. It is also known a device for controlling a pump power unit, including pressure sensors installed on a porous container, pump motor control units, magnetic flux tubes and an intermediate relay, as well as a power supply unit 2. However, this device provides only hard, alternating operation pumps without each time work. Due to the fact that the cycles of operation of pumps are heterogeneous, the total time of operation of each of the pumps is unequal, which leads to unevenly I wear them, which is the reason for reducing the durability and reliability of the pumping unit. The purpose of the invention is to optimize the alternate operation of the pumps by leveling the time of their operating conditions. This goal is achieved in that the device contains capacitors connected to the contacts of magnetic actuators and transistor switches connected to the contacts of magnetic actuators and a capacitor discharge relay, while the capacitor discharge relay is connected to the power supply through the contacts of magnetic starters and an intermediate relay. FIG. 1 shows a functional diagram of an automated pump installation; in fig. 2 is a circuit diagram of a device for controlling a pumping unit. The device contains sensors 1 and 2 of pressure, installed on a porous tank, on which pumps operate, blocks 3 and 4 of motor control of pumps. The control unit 3 of the first pump contains a transistor 5, a relay with winding 6 and contacts 7 and 8, a capacitor 9, resistors 10-12, an intermediate relay valve 13 and contacts 14-16. And a magnetic starter of the pump c. winding 17 and pins 18-20. Block 4:., .- “.;. .:.: -: -.-, .. and. --v-- ,--. -. control of the second pump contains a transistor 21, the collector circuit of which includes a relay with a winding 22 and contacts 23 and 24, a capacitor 25 resistors 26-28, an intermediate relay with a winding 29 and contacts 30-32 and a magnetic starter of the pump with a winding 33 and contacts 34-36.In addition, the circuit contains a common intermediate relay with a winding 37 and contacts 38. and 39 and the discharge of capacitors with a coil of 40 and contacts 41-43. Sensor 1 closes and opens the connector taKT at pressure P and .Р., (РТТ) correspondingly, sensor 2 closes and pTaiTwKKaieT contact at pressures Pj and Р Р4 4. 999T is natural. When, this p P „and R. Rts. . Instead of pressure sensors 1 and 2, level sensors and other controls can be used. Transistors 5 and 21 are switches for controlling the windings of relays 6 and 22, respectively. Capacitors 9 and 25 and resistors TO. And 26 are designed to take into account the time of pump operation by charging capacitors 9 and 25 through resistors 10 and 26 through contacts 18 and 34 when the work of nepBOrd and the second yaysov cooiSeifsztVenno. The total charge time on the RC circuit (9-10 and 25-26) corresponds to the maximum possible cycle time of the pumps to account for the duration of the cycles of any duration. Resistors 11, 12 and 27, 28 are designed to set circuit parameters to provide. Identity to achieve equal to H of capacitors 9 and 25 across transistors 5 and 21 according to BeHHOi. This time must be single-ended for both blocks 3 and 4, and sufficiently short, no more than the technological time of idle operation. . Device pa6otofef e Hefly} 6iiiKM way; To bring the circuit back to its original state (when the pumps were not running, j uncharged capacitors 9 and 25), the first peg pump should be selected when the pump is first turned on. installation, for example, the first, it is necessary to apply the voltage to the winding 13 of the first pump or charge the capacitor 25 of the pump, for example by briefly pressing pins 14 and 34 respectively or by pressing the Pötsigal s Ш 7 Ш Thré; ; parallel to those shown there} (not shown). In this case, the relay with winding 13 through contacts 41 and 14 becomes energized and closes contact 15 in the supply circuit of winding 17 of the magnetic starter of the first pump. ,; ... Water from the water supply source with the pump is pumped into the pressure tank (pneumo tank) 7 From where it comes - J into the water supply network) to the consumer. Water injection into the pressure tank is carried out to the RZ pressure, which is due to the value of the necessary pressure in the water supply network. When water is consumed from a pressure vessel of an unacceptable level; the air pressure in it drops to P, after which the contact of sensor 1 closes and the magnetic starter 17 of the first pump triggers its electric motor. The starter; 17 closes. A fault contact 18 in the circuit of the charge of the capacitor 9. When the water level in the supply capacitance reaches the required value: the pressure input P, the contact of sensor 1 opens, the current de-energizes winding 17 of the magnetic actuator, which opens contact 18, stopping condenser 9. The magnitude of the charge of the condenser is 9 gtOi on the operation time of the first pump. Through the closed contact 20, contacts 36 and 38, the discharge relay is triggered with the winding 40, which closes its contacts 42 and 43. Next, through the closed contact 19, the discharge of the capacitor 9 to the transistor 5 begins, resulting in a decrease in the potential of the transistor 5 and the current increases the collector, which triggers the relay with a shroud 6, closing its contact 7. Simultaneously with the capacitor 9, the capacitor 25 discharges 25 to the transistor 21 through contacts 35 and 43 /, resulting in a decrease in the capacitance of the base transistor 21 and Vectorial current that triggers the relay coil 22, zamykayschogo your contact .23.KonZgakty 8 and 24 at the discharge of the capacitors 9 and 25 are open. The discharge of capacitors 9 and 25 starts when the pumps are not running at the same time and occurs in parallel .. Since the magnitudes of the capacitors 9 and 25 are not the same, one of them ends the discharge before the other, for example, the charge of the capacitor 9 is large 25, since the second nayos did not work (the first pump worked more time than the second). Then the capacitor 125 is discharged earlier than the capacitor 9, and the winding and the 22 relays are de-energized, closes its own, pin 24 and energizes the winding 37 of the common intermediate relay, which, in turn, disconnects its contact 38 and de-energizes the winding 40 of the relay yes capacitors whose contacts are 42

and 43 in the discharge circuit of the capacitors 9 and 25 is opened, stopping the discharge of capacitors, 9 and 25, the discharge of the capacitor Y stops and there remains a charge equal to the charge difference on the capacitors 9 and 25, which characterizes the difference between the durations of the first and second pumps. After the operation of the common intermediate relay with the winding 37, its contact 39 closes and via the contact 7 feeds the winding of the intermediate relay 29 of the second pump, which locks through its contact 30, since the operating time of the first pump is longer and therefore the second cycle should work in the next cycle pump. When re-closure-. The research institute of contact 1 is energized on the winding 33 of the actuator of the second pump and it is started. The process indicated by the first pump for charging the condenser 25 of the second pump occurs and then discharging it after switching off the actuator 33, stopping the pump and comparing the charge values of the capacitors 9 and 25 to determine the difference in pump operation time and selecting a working pump for the next pumping cycle. installations

Thus, the pumps operate taking into account the operation time of each one, which ensures equality of the duration of operation of the first and second pumps, therefore, their wear will be uniform and equal.

If the water flow rate from the pressure tank is higher than the capacity of one operating pump, the pressure in the tank drops to PJ, then the sensor 2 contact closes and the starter of the idle pump receives power through the contacts of the intermediate relay of the operating pump and it starts. For example, if the first pump is running, then the contact 16 in the circuit of the actuator 33 of the inoperative second pump is closed, and in case of contact closure of the sensor 2, the starter 33 will operate, which ensures the input of the second pump. The total capacity of the two running pumps covers a shortage

water, the tank starts to fill up and the pressure in it rises to P, the contact of sensor 2 opens and the second pump is cooled. With the final filling of the tank in pressure, pressure P is restored and the contact of sensor 1 opens, stopping the first pump.

In all cases, the charge kondensa TOjpOB 9 and 25 occurs when working

pumps and, accordingly,

the operation time of each pump, followed by comparison and selection of a pump with a lower failure.

The proposed pumping unit control device provides optimization of pump operation by leveling the pumping times during their alternate operation, which makes it possible to operate the pumps alternately with their equal efficiency.

and increased reliability of the entire installation.

 the invention

The device, for controlling the pumping unit, turns on pressure sensors installed on the pressure tank, pump electric motor control units containing magnetic starters and intermittent

relays, as well as power units, characterized in that, in order to optimize the alternate operation of the pumps by leveling their time

operating conditions, it contains capacitors connected to the contacts of the magnetic starters, and transistor switches connected to the contacts of the magnetic starters and the discharge switch

capacitors, while the capacitor discharge relay is connected to the power supply through the contacts of the magnetic starters and the intermediate relay.

Sources of information taken into account in the examination

1. Copyright certificate USSR 435332, class / E 03 B 5 / 00,13.08.74.

2. Collection of the Mechanization and Electrification of Socialist Agriculture. 1975, 11, p. 25

Claims (1)

Claim A device for controlling a pump installation, including pressure sensors installed on a pressure vessel, control units for electric motors of pumps', containing magnetic starters and an intermediate relay, as well as a power supply unit, which, in order to optimize alternately pumps by equalizing the time of their operating conditions, it contains capacitors associated with the contacts of the magnetic starters, and transistor switches connected to the contacts # of the magnetic starters and the capacitor discharge relay, while the relay capacitor discharge is connected to the power supply through the contacts of magnetic starters and an intermediate relay.