JPH0278776A - Liquid level detecting type automatic pumping device - Google Patents

Abstract

PURPOSE:To previously prevent falling water phenomenon by providing a liquid level sensor for detecting that a water level in proximity to a water pump on a suction line reaches the predetermined water level, and continuing drive of a vacuum pump so far as the suction line is actually not filled with water. CONSTITUTION:A liquid level sensor WS provided in proximity to a water pump WP on a suction line 1 outputs a water level detected signal a, when the water level on the suction line 1 reaches the predetermined water level. Further, a pressure sensor PS provided in proximity to the water pump WP on a discharge line 2 outputs a pressure detected signal b, when the discharge pressure of the water pump WP reaches the predetermined pressure. A controller C stops drive of a vacuum pump VP, when input of the water level detected signal a from the liquid level sensor WS continues for a certain duration.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an automatic water pumping device.

In particular, it is used in a liquid level detection type automatic water pumping device that can prevent water falling by monitoring the water level in the suction line.

(Prior Art) As shown in FIG. 5, a conventional automatic water pumping device includes a water pump WP that sucks water W to be pumped through a suction line 3 and drains it through a discharge line 2, and this water pump WP.
A pressure sensor PS detects when the outlet pressure of the suction line 1 reaches a predetermined pressure, and a vacuum pump vP sucks up water while sucking out the air in the suction line 1.

At the start of water pumping, this automatic water pumping device operates both the vacuum pump vP and the water pump WP, sucks out the air in the suction line 1, and sucks up water.
When the outlet pressure of P reaches a predetermined pressure, it is assumed that the suction line including the water pump WP is filled with water, and the water pump WP
When pressure sensor PS detects that the outlet pressure of If you open it, water will be sprayed out.

(Invention or problem to be solved) However, the conventional automatic water pumping device mentioned above.

When the outlet pressure of the water pump WP reaches a predetermined pressure, it is assumed that the suction line l containing the water pump WP is filled with water, and even if the suction line l is not actually filled with water, the water pump WP If the pressure sensor PS detects that the outlet pressure of the pump has reached a predetermined pressure, the drive of the vacuum pump P is stopped, so there is a problem that a water drop phenomenon occurs in this case.

When a water drop phenomenon occurs, it is necessary to manually turn on the switch of the automatic water pumping device again to restart it, which cannot be called automatic water pumping.

An object of the present invention is to solve the problems of the conventional device as described above and to prevent the phenomenon of water falling.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a water pump that sucks water to be pumped through a suction line and drains water through a discharge line, and a water pump that pumps water while sucking out air in the suction line. In a water pumping device equipped with a vacuum pump for suction, there is provided a liquid level sensor that outputs a water level detection signal when the water level near the water pump in the suction line or a predetermined water level is reached, and a water level detection signal from the liquid level sensor. The configuration includes a controller that stops driving the vacuum pump when input is continuously made for a certain period of time.

(Effects) Since the liquid level detection type automatic water pumping device of the present invention has the above-described configuration, it has the following effects.

In other words, a liquid level sensor was installed to detect when the water level near the water pump in the suction line reached a predetermined level.
This allows the water level on the suction line side of the water pump to be monitored. Unlike conventional devices, the controller stops driving the vacuum pump when the water level detection signal from the liquid level sensor is continuously input for a certain period of time.
Even if the outlet pressure of the water pump WP reaches a predetermined pressure, the drive of the vacuum pump is not stopped unless the suction line is actually filled with water, thus preventing the water falling phenomenon that occurs in conventional devices. Can be done.

(Example) The illustrated embodiment will be described below.

FIG. 1 is a schematic diagram showing an embodiment of a liquid level detection type automatic pumping device according to the present invention, and parts similar to those of the conventional device shown in FIG. 5 are given the same reference numerals.

In Fig. 1, WS is a liquid level sensor installed near the water pump WP in the suction line 1, and is used to detect when the water level in the suction line 1 at the installation location has reached a predetermined level. It is. The liquid level sensor WS is configured to output a water level detection signal a when the water level in the suction line 1 reaches a predetermined water level.

PS is a pressure sensor provided near the water pump WP in the discharge line 2 as in the past, and outputs a pressure detection signal when the outlet pressure of the water pump WP reaches a predetermined pressure. However, this pressure detection signal from the pressure sensor PS is not a condition for stopping the driving of the vacuum pump vP. This detection signal is a signal for lighting a pumping completion lamp, which will be described later.

C is a controller which stops driving the vacuum pump vP when the water level detection signal a from the liquid level sensor WS is continuously input for a certain period of time (for example, 2 seconds). The reason for requiring [continuously inputting the water level detection signal a from the liquid level sensor WS for a certain period of time] as a stop condition for the vacuum pump vP is that normally, when water flows into the water suction line l, The water first enters in the form of droplets, then becomes wavy, and then fills the suction line l, so the vacuum pump vP is stopped when the inflow is incomplete, ``splash state'' or ``wavy''. This is to prevent this and to stop the vacuum pump vP after the inflow is complete.

The device described above can monitor the water level on the suction line l side of the water pump WP by the liquid level sensor WS, and the liquid level sensor WS continuously outputs the water level detection signal a for a certain period of time (for example, 2 seconds). When the water pump W
Even if the outlet pressure of P reaches a predetermined pressure, the vacuum pump vP will not be driven or stopped unless the suction line l is actually filled with water, thereby making it possible to prevent water falling.

Next, tax will be deducted with reference to FIG. 2 regarding one or more specific circuit configuration examples of such devices.

In the figure, part A is also used in conventional devices. 5, 6.7 are terminals connected to the power supply, and M is a microswitch attached to the pump lever. Ml is a microswitch attached to the throttle of the vacuum pump, which will be described later, and is turned off to stop the device when the number of revolutions of the pump exceeds a predetermined number of revolutions. PB is an activation button, and PB2 is an emergency stop button. R-engineer.

R,,R,,R,is a relay,R-I-s+R,,
・R1-ko, R,-, ・R2-2・R3-
,.

R,-, ,R,- are the contacts of each of these relays.

T and T' are the timer and its contacts, and Sz is the timer select switch. Ps' is a switch for the pressure sensor PS, which is turned on when the outlet pressure of the water pump WP reaches a predetermined pressure. CL is the vacuum pump's 1i magnetic clutch, PB's is the vacuum pump's emergency operation button, and SO is the throttle solenoid. R2 is a no-pumping lamp;
Pff is a pumping completion lamp, and R4 is an operation lamp. O
8 is an oil switch that detects when the remaining amount of oil in the vacuum pump vP becomes low and turns it off. OL is an oil lamp and is normally lit,
The light goes out when the oil switch is O8 or 0FFL.

Part B is a circuit added to part A in this embodiment, and 2 to 0 are connection terminals.

WS is a liquid level sensor, which uses a pair of corrosion-resistant edges with an insulator as the detection part 8, and converts the change in resistance value that occurs when water comes into contact with this detection part 8 into voltage. It has become.

A specific example of the liquid level sensor WS is shown in FIG.

In the figure, 20 is a sensor main body, and this main body 20
is attached to the suction line 1. This main body 20 also serves as a stopper.

21 and 22 are edges, each of which is made of stainless steel wire 21a.
, 22a is a vinyl tube 21b.

22b. These edges 21 and 22 are.

Each of them penetrates the main body 20, makes a U turn, and fits the tip into the main body 20. S & body 21゜22 and main body 20
The space between them is sealed by filling with epoxy resin 23. Each of the edges 21 and 22 has a vinyl tube removed in a ring shape at a position spaced apart from the lower surface of the main body 20 by a certain distance, and the removed portion (that is, the exposed portion of the stainless steel wire) 21c.

When 22c is submerged in water in the suction line l, a water level detection signal a is output. With this configuration, the exposed portions 21c and 22c of the stainless steel wires are spaced far apart from the bottom surfaces of the two main bodies 20, and the spaced portion is insulated by the vinyl tube, so that
When the detection part 8 is submerged in water and the model is pulled out, one main body 20
Even if water remains on the lower surface of the exposed portion 21c.

22c, and when the detection part 8 is submerged in water and the replica is pulled out, water droplets attached to the edges 21, 22 of the detection part 8 will be removed from the edges 21, 22. After falling to the lowest ends 21d and 22d, the exposed portion 21c,
A water bridge is formed between 22c and there is no short circuit.Furthermore, the distance L between the exposed parts 21c and 22c
Since the distance L2 to the insulating part is shorter than 1, even if a water bridge were to be formed, it would be between the insulating part at a short distance and there would be no short circuit.Therefore, such a liquid level sensor According to this method, the liquid level can be reliably detected without malfunction. In addition, the detection part 8 of this liquid level sensor is mounted on the main body 2 by making a U-turn at the tips of the edges 21 and 22.
0, so if the edge of the detection unit 8 housed in the suction line is too long, cut the tip end of the edge and fit it into the main body 20 for sealing. This allows for easy adaptation to the situation within the line.

24 and 25 are terminals for connecting the edges 21 and 22 to the circuit B, 24 and 25 are respectively connected to the terminal (2) and the terminal (2) of the circuit B. Further, 26 is a terminal connected to the shielding terminal (3) of circuit B, and 27 is a shielding wire.

In FIG. 2, numerals 9 and 10 are comparators, which are used when the input voltage from the liquid level sensor WS becomes larger than a preset value.

The output of the comparator IO becomes high level.

The set value is set so that the comparator will not operate if the resistance value is such that water droplets adhere to the detection part 8 of the liquid level sensor.

11 is an oscillation circuit, and SW1 to SW4 are switches for setting delay time.The oscillation circuit 11 is configured to form a loop with a NAND circuit 11a and two inverters 11b and llc. Comparator 10
After the output becomes high level, oscillation occurs when the delay time elapses. That is, when the output of the comparator IO is continuously at a high level for a certain period of time, the oscillation operation is performed. The delay time in this embodiment is set to 1 second by turning on one switch. Therefore, for example, if switches SWI to SW4 are all turned on, the delay time is set to 4 seconds, and switches SWI and SW4 are set to ON.
If only 2 is turned on, it will be set to 2 seconds. Note that the delay time when all the switches SWI to SW4 are turned off is 0.1 seconds.

Reference numeral 12 denotes a monostable multivibrator, and when the output of the comparator 10 becomes high level, it is inputted to the clear terminal CD and becomes active. Then, the output from the oscillation circuit 11 is connected to a buffer inverter lid.
The output from the output terminal Q activates the transistor Tr, which in turn activates the relay R7. Note that the time constant of the monostable multi-bibreak 12 is set larger than the oscillation period of the single oscillation circuit 11.

R, , , R, are the contacts of the relay Rte. Relay R7
When activated, Ry-+ turns ON and R,-.

becomes OFF.

In this embodiment, the power source is, for example, DC12V.

It is designed to operate on either 24V DC, and 1
3.14 is a regulator for sharing these power supplies,
15 is a noise filter.

R6 is a relay that operates when the oil lamp OL is lit. Rws-s is the contact point of relay R6, and when the oil lamp OL is lit, ONL/
However, it turns off when the oil lamp goes out.

The operation of the circuit as described above will be explained below.

First, when the activation button PB is pressed, the relay R1 is activated, and its contacts R, , are turned on as self-holding contacts, and the timer T is activated. In addition, contacts R, -, are also turned on to operate the throttle solenoid SO, and contacts R1-2 are also turned on.
NL/activate the vacuum pump electromagnetic clutch CL.

The vacuum pump vP is driven by the operation of the throttle solenoid SO and vacuum pump electromagnetic clutch CL.

Due to the IN operation of the vacuum pump ■P and the water pump WP, the outlet pressure of the water pump WP reaches a predetermined pressure, and the pressure sensor P
When the switch PS° of S is turned on, relay R4 is activated and contact R<-+ is turned off, but if the water level on the suction line 1 side of water pump WP has not reached the predetermined water level at this point, , since relay R1 does not operate, contact Rt
-t remains ON (also 1 normal oil lamp OL
is lit and relay R6 is activated, contact R6-1 is also turned on.
), contact R4-1 becomes O when relay R4 is activated.
Even if it becomes FF, the operating state of relay R is maintained, and the driving state of vacuum pump vP is maintained.

After that, when the water level on the suction line 1 side of the water pump WP reaches a predetermined water level and the liquid level sensor WS continuously detects this for a certain period of time (for example, 2 seconds when SWI and SW2 are ONL/), as described above, As described above, the output of the comparator 10 causes the oscillation circuit 11 and the monostable multivibrator 12
, and transistor Trσ) action (Relay R7 is activated. Relay R2 is activated L:'), contact R9, -I
At the same time as the pumping completion lamp P lights up, the contact Ry-a turns ON.6. Contact point Rt-*
l)' OF F When the switch PS' of the pressure sensor PS is turned ON, the relay R4 is activated and the contacts R, 2 are turned OFF, so the relay R1 is not activated. Stop, contacts a, -,, R1-f
f is turned off and the drive of the vacuum pump VP is stopped.

Here, water can be discharged by opening the drain valve 3, but if the inside of the suction line 1 is no longer filled with water for some reason, the water level detection signal from the liquid level sensor WS cannot be obtained. Immediately, the output level of the comparator 10 becomes low, and the monostable multifunction device 7 to the iblator 12 become inactive. As a result, relay R7 is also immediately deactivated, contact R7-2 is turned on, and vacuum pump vP is automatically restarted.

According to the unimplemented example, even if the outlet pressure of the water pump WP reaches a predetermined pressure, the vacuum pump vP will not be driven or stopped unless the suction line 1 is actually filled with water, so that the water falling phenomenon will not occur. Prevented in advance.

Although not directly related to the present invention, the operation lamp P4 lights up when the operation button PBI is turned on, and the relay contact R3-
1 or R4-1 or R7, is turned off. After the relay R1 is activated and the vacuum pump VP is activated, the timer T is activated when the outlet pressure of the water pump WP does not reach the predetermined pressure for some reason and the pressure sensor switch PS° is turned ON.
, if not, turn contact T゛ to 0FF after a certain set time has elapsed.
L/deactivates relay R3, and contacts R,-,.

Set R2-2 to 0FFL/ to make relay R3 inactive,
The contact R1-1 is turned off to stop the vacuum pump, and the contact R3-8 is turned on to turn on the pumping impossible lamp P. Further, when the remaining amount of oil in the vacuum pump vP becomes low and the oil lamp OL goes out, the relay R6 becomes inactive, its contact R6-1 turns OFF, and the drive of the vacuum pump vP is stopped.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above-mentioned embodiment and can be modified as appropriate within the scope of the gist of the present invention.

For example, instead of the oscillation circuit 11 and monostable multivibrator 12 in the circuit configuration described above, a conditional circuit using a gate circuit may be configured.

Further, the detection unit 8 of the liquid level sensor WS does not necessarily have to have a U-turn structure, but may have a structure that can output a water level detection signal with a certain degree of accuracy when the water level reaches a predetermined water level. For example, as shown in FIG. 4, stainless steel wires 21a and 22a protruding from the main body 20
vinyl tube 21b to a predetermined distance from the bottom surface of the main body.

22b may be used, but in this case, it is desirable that the interval between the stainless steel wires 21a and 22a be large enough to prevent water bridging.

In addition, various lamps, timers, microswitches, etc. as safety devices do not necessarily need to be provided.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an embodiment of a liquid level detection type automatic pumping device according to the present invention, Fig. 2 is a circuit diagram showing an example of a specific circuit configuration of the same, and Figs. 3(a), (b) c) (d) is a front view, a partial vertical sectional view, a bottom view, and a partially omitted plan view of the liquid level sensor;
4(a) and 4(b) are a front view and a bottom view of a liquid level sensor different from that of FIG. 3, and FIG. 5 is a schematic diagram of a conventional device. 1... Suction line, 2... Discharge line, W... Water, WP... Water pump, PS... Pressure sensor, vp.
...Vacuum pump, WS...Liquid level sensor, C...Controller. Figure 1 (c) (d) Figure 3 (a) (b) Figure 4 Figure 5

Claims (1)

[Claims] In a water pumping device including a water pump that sucks water to be pumped through a suction line and drains water through a discharge line, and a vacuum pump that sucks up water while sucking out air in the suction line, a liquid level sensor that outputs a water level detection signal when the water level reaches a predetermined water level; and a controller that stops driving the vacuum pump when the water level detection signal from the liquid level sensor is continuously input for a certain period of time. Liquid level detection type automatic water pumping device equipped with