JPS5977091A - Control device for pump - Google Patents

Abstract

PURPOSE:To simplify a control circuit by a method wherein the output from a flip-flop of which output is reversed due to the reversing of signals fed from a pressure sensor or a flow sensor and the output from either of these sensors are logically judged to enable an alternating operation of two pumps. CONSTITUTION:Either one of the outputs Q24' and Q25' from J-K filp-flop circuit is surely at an ''H'' level and the other output is at an ''L'' level and they are reversed when a pressure switch 11 is changed over from its ''ON'' to its ''OFF'' state. If the output Q24' is at an ''L'' level, the output 28 of NOR gate becomes an ''H'' level when the pressure switch 11 is turned on, and a pump 24 is driven or turned on through a transistor 14, a photothyristor 16, a rectifier stack 18 and a magnet conductor 20. In this way, since a small-sized semiconductor element is applied without applying any conventional alternating relay, the control circuit can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a pump having an alternating operation function and used for water supply to buildings and the like.

Conventional configuration: and its problems Generally, when a pump is used as an automatic water supply device for supplying tap water under pressure to a building, etc., a backup pump is often provided in case the pump breaks down. In this case, even if you try to operate the spare pump in the event of a failure, the pump may not operate due to sticking or rusting of the rotating parts because the spare pump has not been used for a long time, or problems may occur such as red water flowing out. There are many. For this reason, at present, an alternate operation system is widely used in which two pumps are operated alternately to prevent the above-mentioned rain-covering and rusting.

The conventional alternating operation type pump control circuit has a sensor 1 that detects pressure or flow rate and turns the contacts ON and OFF, as shown in Fig. 1, and a sensor 1 that always turns ON and one OFF.
An alternating relay 2 which has two contacts 7 and 8 and turns 0FF-, ON, 0N-OFF when the sensor 1 switches from ON to OFF is connected, and the sensor 1 and the contact 7 are both ON [if the magnetic contactor 3 Pump through 6 f ON
When the sensor 1 and the contact point 8 are both turned on, the pump 6 is turned on via the magnetic contactor 4. Therefore, when the pump turns 0FF- and ON, the 2
The pumps 5 and 6 will be operated alternately. However, the alternating relay 2, which is indispensable in the configuration shown in Figure 1, is composed of a complex combination of mechanical parts such as coils, cams, and contacts. The reliability is lower than that of semiconductor circuits, as there is a possibility of wire breakage, coil disconnection, cam wear, etc. Also, because many mechanical parts are used, the shape is also large.
The shape of the control box will also be large. The unit price of a single alternating relay is also quite expensive.

OBJECTS OF THE INVENTION The present invention overcomes the drawbacks of conventional alternating relays and provides a highly reliable and compact control system. .

Structure of the Invention In order to achieve all of the above objects, the present invention provides an 0N-OF sensor.
The flip-flop has an alternating operation function that operates two pumps alternately in response to a pump control device including a logic circuit that logically determines a signal output from the sensor and an output of the flip-flop circuit, and an output circuit that fully operates the two pumps in response to the output of the logic circuit; It is composed of

DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows a pressure gauge suinote 11. as a sensor. IC1 of the flip-flop circuit to J- as a flip-flop circuit
2. NOR gate 21.22 as logic circuit, transistor 13.14 and photothyristor 1 as output circuit
5.16 and Magneno i contactors 19 and 20 are used. 1. Two pumps in addition to alternate operation23.
A select switch 23' is provided in order to carry out independent automatic operation in which 24f is operated independently in response to ON-OFF of the pressure casing note. When the select switch is set to the alternate operation mode, one of the outputs Q24' and Q25' of the 7-linopfronog circuit at J- is always at the H level and the other is at the L level, and the pressure switch 11 is 0
The pressure switch output signal 27, which switches from L level to H level when switching to N-OFF, is input to the flip-flop circuit at J-, so that among the outputs Q24' and Q25', the H level output becomes L level K, L Level output u Hv
Herni is reversed. By logically determining the outputs Q24', Q25' and the pressure cassette output signal using NOR gates, only the NOR gate output 28.29 to which the L level output of 024', Q25' is input is pressure cass isostat. It is at H level only while it is ON. Suppose that the output 024' is at L level, when the pressure cassette 11 is OJ, the NOR gate output 28 is at H level and the transistor 14. Photothyristor 16 rectifier stack 18. Pump 2 via magnetic contactor 20
4'iON.

Next, when the pressure switch 11 is turned off, the pressure switch output signal 27 switches from L level to H level, the pump 24 stops, and output 024' goes to H level, output 026' goes to L level, and then the pressure switch output signal 27 switches from L level to H level. When pump 11 is turned on, pump 23 operates.

Figure 3 is a timing chart of this circuit, 30 is the operation of the pressure switch 33, 34 is the pump 24, 2, respectively.
This shows the operation of No. 3. As shown in FIG. 3, the pumps 24 and 23 operate alternately in response to ON-OFF of the pressure cassette.

In addition, select switch 23'i P1 mode and P2
When switching to mode, outputs Q24' and Q25' are L
Since the level side is always fixed at P1 mode and 025' in uQ 24/p 2 mode regardless of whether the pressure cassette is ON or OFF, each pump performs independent automatic operation at 24°230.

Effects of the Invention As described above, the present invention can have the same function as the conventional alternating relay, but since it uses a highly reliable and small semiconductor element, The control circuit is much more reliable than the
The control bonox will also be made smaller. - Furthermore, since inexpensive semiconductor elements are used, the cost of the control circuit becomes significantly cheaper. Further, since the control is performed by a low voltage circuit, operation modes such as an independent automatic operation mode can be easily added by adding a small number of inexpensive parts by adding the aforementioned select switch 23'. As described above, the present invention has many advantages and is useful compared to the conventional one-way alternating relay type.

In addition, the present invention may use other semiconductor elements for flip-flop circuits, logic circuits, and output circuits, and has functions such as a parallel operation function that operates two pumps at the same time when the amount of water used is large. may be added.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional pump control device, FIG. 2 is a circuit diagram of a pump control device according to an embodiment of the present invention, and FIG. 3 is a timing chart of the circuit of FIG. 2. 11...Pressure switch, 12...J-
Flip-flop IC circuit, 13, 14...
Logic circuit, 15.16...photothyristor,
19,20...Magnetic contactor, 23
, 24...Pump, 23'...Select switch.

Claims (1)

[Claims] It has an alternate operation function that operates two pumps alternately in response to ON/OFF of the sensor, and the two outputs are reversed by reversing the signal output from the pressure switch or flow rate sensor and the sensor. A Noritsubu flop circuit constituted by a semiconductor element, a logic circuit for logically determining the signal output from the sensor and the output of the flip-flop circuit, and two pumps corresponding to the outputs of the logic circuit. A pump control circuit characterized in that it is composed of an output circuit that operates a pump.