JPH059051Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a strainer for a pump device for filtering water from a water source and supplying the filtered water to an inlet of a pump body.

(Prior Art) In general, this type of strainer has a structure that only includes a filtration part for filtering water from a water source, and is not provided with anything to detect the water level of the water source relative to the strainer.

(Problem to be solved by the invention) Therefore, when the water level of the water source relative to the strainer falls below a predetermined water level, the amount of water supplied from the strainer to the pump body via the suction pipe is insufficient.
The pump body becomes idle, and the ceramic plunger in the pump body becomes abnormally hot due to friction with the cylinder packing. For this reason, when water is newly introduced into the water source and newly sucked into the cylinder chamber in the high temperature state, there is a problem that the plunger is rapidly cooled and cracks. Even when the parts were not in use, there was a problem with the plunger etc. seizing up.

The present invention was devised in view of the above points, and its purpose is to be able to automatically detect the water level of the water source relative to the strainer, and to immediately stop driving the prime mover when the water level falls below a predetermined water level. It is something to do.

(Means for Solving the Problems) Accordingly, the present invention provides a water suction device for a pump device comprising a pump body and a prime mover for driving the pump body, the water suction pipe being connected to the suction port of the pump body. A strainer installed at the tip of a pipe,
A strainer body A has a filtration member for filtering water from a water source on the outside, and a suction port that communicates with the water suction pipe on the inside of this filtration member. A water level detector 6 is provided which operates when the water level falls below a predetermined water level, and a wave barrier 7 is provided around the water level detector 6.

(Function) Strainer body A of water source is connected to strainer body A.
Since the water level detector 6 is provided to detect the water level relative to the water source, the water level of the water source relative to the strainer body A remains below the predetermined water level regardless of the form of the water source and even if the strainer moves upward relative to the bottom surface of the water source. Since the signal from the water level detector 6 can be used to stop the driving of the prime mover, the water level detector 6 is installed inside the filter member, so the water level at the water source can be detected even if the water level is high. Even if the filtration member becomes clogged and suction cannot be drawn into the strainer body A, the operation of the pump body in the pump device can be stopped, so dry running of the pump body can be reliably prevented. .

In addition, since the wave barrier 7 is provided around the water level detector 6 provided inside the filter member, it can be used when a stirrer is attached to the water source and the water from the water source is stirred, or when applied to a river with many waves. Even if the water from the water source ripples, the filtration member can first prevent the ripples from propagating into the strainer body A, and furthermore, even if the ripples propagate into the filter member, Since the wave barrier 7 can prevent these ripples from reaching the water level detector 6, malfunctions of the water level detector 6 can be prevented with even greater precision.

(Example) The illustrated strainer has a vertical tube 1 on the upper surface of the central part.
1, a core 2 screwed to the rising tube 11, a disc-shaped celestial body 3 supported by the core 2, and a connection between the bottom body 1 and the celestial body 3. An annular filtration member interposed between the outer peripheral parts [hereinafter referred to as filtration net]
The core 2 of the strainer body A consisting of 4,
Pump body P and prime mover B that drives the pump body
and a suction pipe C to the suction port of the pump body P.
The suction pipe C of the pump device configured to connect
It is designed to be connected to the tip. Further, the rising tube 11 is provided with a plurality of suction ports 12 that penetrate in the radial direction, and a weight 13 is embedded in the bottom plate 1.

In the embodiment shown in FIGS. 1 and 2, the celestial body 3 is provided with a mounting hole 31 penetrating in the vertical direction, and the holder 5 oriented in the vertical direction is mounted in this mounting hole 31. The holder 5 is provided with a water level detector 6 that operates when the water level of the water source relative to the strainer body A falls below a predetermined water level.

This water level detector 6 consists of a float 62 having a magnet 61 and a reed switch 63 which is operated by the attraction force generated by the magnetic field of the magnet 61.
while holding the float 62 inside the
It is supported so that it can move up and down freely with respect to the holder 5, and when the water level H of the water source with respect to the bottom surface of the strainer body A is high, the magnet 61 closes the reed switch 63.
When the float 62 moves downward as the water level H decreases, the magnet 61 moves in a direction approaching the reed switch 63, and the water level H becomes below a predetermined water level. , the reed switch 63 is turned on by the attraction force generated by the magnetic field of the magnet 61, and when the water level H reaches a predetermined water level or higher, such as when water is poured into a water source such as a water storage tank, the float 62 is turned on.
moves upward, and the magnet 61 is displaced upward to release the attraction of the reed switch 63 by the magnet 61 and turn off the reed switch 63. Further, the reed switch 63 has lead wires 64 connected to terminals at both ends thereof.
is connected, and when this lead wire 64 is connected to the magnet coil of the engine in the prime mover B and the reed switch 63 is turned on,
The power supply flowing from the magnet coil to the spark plug is grounded to prevent the spark plug from igniting and stop driving the engine. Further, when the prime mover B is a motor, the connection lead wire 64 is connected to the electric circuit of the motor, and when the reed switch 63 is turned on, the circuit to the power source of the motor is disconnected, and the drive of the motor is stopped. It composes. The lead wire 64 may be coated and wound around the outside of the suction pipe C as shown in FIG. 1, or may be attached without being wound. It may be placed in C.

Further, the float 62 is formed into a hollow annular shape from a lightweight material such as synthetic resin, and is configured to move up and down as the water level fluctuates.

Further, a cylindrical wave barrier 7 is attached to the holder 5, so that even if the water source such as a water storage tank is agitated and the water source is rippled, the ripples do not greatly affect the float 62. That's what I do.

In Fig. 3, D is a liquid feeding pipe connected to the discharge port of the pump main body P, E is a pressure control valve interposed in the middle of this liquid feeding pipe D, F is a spill pipe, and J is a crank of the pump main body P. This is a stirring blade connected to the shaft via a flexible shaft.

The strainer constructed as described above connects the tip of the core 2 to the tip of the suction pipe C made of a flexible hose as described above, and inserts it into the bottom of a water source G such as a water storage tank, river, or reservoir. When the water source G has a large amount of water and the water level of the water source relative to the strainer body A is high, the float 62 moves upward to the maximum extent and the magnet 61 moves upward relative to the reed switch 63. The reed switch 63 is turned off.

Then, as the pump body P is driven by the prime mover B, water from the water source G is sucked into the cylinder chamber of the pump body P through the strainer body A and the suction pipe C, and the water level of the water source G is raised to the float 62 position. When the water drops further, the float 62 moves downward, and when the water level of the water source G relative to the strainer body A becomes lower than a predetermined water level, the magnet 61 approaches the reed switch 63, and the attraction force due to the magnet's magnetic field increases. As a result, the reed switch 63 is turned on, and the drive of the prime mover B can be immediately stopped. Therefore,
It is possible to reliably prevent the pump body P from running idle.

Furthermore, since the detector 6 is provided on the strainer body A, the detector 6 can be reliably operated when the water level relative to the strainer body A is below a predetermined water level, regardless of the position of the strainer with respect to the bottom surface of the water source.
Therefore, when there is sufficient water from the water source, the strainer placed in a predetermined position may unexpectedly move upwards, causing
Even if the water level with respect to the strainer body A falls below a predetermined water level, dry running of the pump body P can be reliably prevented.

In addition, attach the holder 5 to the strainer body A,
This holding body 5 is provided with a water level detector 6, and as shown in FIG. A float 62 having a diameter 61 may be moved up and down along the core 2.

Further, the structure of the water level detector 6 is not particularly limited.

(Effects of the invention) As described above, according to the invention, the strainer body A has a filtering member for filtering water from a water source on the outside, and a suction port communicating with the water suction pipe inside the filtering member. Since a water level detector 6 is installed inside the member, which operates when the water level of the water source with respect to the strainer body A falls below a predetermined water level, it goes without saying that when the water level of the water source falls below the predetermined water level, the water level of the water source Even if the filtration member becomes clogged and suction cannot be drawn into the strainer body A even though the pressure is high, the operation of the pump body in the pump device can be stopped, thereby reliably preventing the pump body from running dry. It can be done.

Moreover, since the wave barrier 7 is provided around the water level detector 6 provided inside the filter member, it can be used when a stirrer is attached to the water source and the water from the water source is stirred, or when applied to a river with many waves. Even if the water from the water source ripples, the filtration member can first prevent the ripples from propagating into the strainer body A, and furthermore, even if the ripples propagate into the filter member, Since the wave barrier 7 can prevent these ripples from reaching the water level detector 6, malfunctions of the water level detector 6 can be prevented with even greater precision.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the strainer of the present invention connected to the suction pipe, Fig. 2 is an enlarged sectional view of only the main parts, Fig. 3 is an explanatory view showing the state of use, and Fig. 4
The figure is a partially cutaway front view showing another embodiment. A...Strainer body, 6...Water level detector.

Claims (1)

[Scope of utility model registration request] A strainer provided at the tip of the water suction pipe of a pump device comprising a pump body and a prime mover for driving the pump body, and configured such that a water suction pipe is connected to the suction port of the pump body, the strainer filtering water from an external water source. A strainer body A has a filtration member having a suction port communicating with the water suction pipe on the inside of the filtration member, and has a water source inside the filtration member A that is connected to the strainer body A when the water level of the water source becomes below a predetermined water level. 1. A strainer for a pump device, characterized in that a water level detector 6 that operates when the water level is turned on is provided, and a wave barrier 7 is provided around the water level detector 6.