JPH01240789A - Pump provided with flow detector switch - Google Patents

Abstract

PURPOSE:To reduce the molding cost and to eliminate an obstacle of lead wire, when a cap is mounted and removed, by relatively turnably mounting a flow detector switch to the cap through a switch case and providing an opening in a pump main unit to be opposed facing to a valve seat. CONSTITUTION:A pump main unit 1 provides an opening 22 to be opposed facing to a valve seat 13. A cap 23 is removably mounted to this opening 22. An annular magnet 21 is embedded in a ring 20. A flow detector switch 30 is actuated being turned on in response to magnetic force of the magnet 21, when it approaches, and being turned off when the magnet is separated. Thus decreasing a number of openings, the molding cost can be reduced. While in case of mounting and removing the cap, the flow detector switch generates no possibility of obstacle in its lead wire.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a pump equipped with a flow rate detection switch.

(Prior art and problems to be solved by the invention) Conventionally,
This type of pump is described, for example, in Japanese Unexamined Patent Publication No. 1988-70680 published on April 1, 1988. In this conventional pump, a float is attached to a valve seat provided between the pump chamber and the pipeline so as to be able to move up and down, and a cover fixed to the opening of the pump body facing the valve seat has a cylinder. A shaped guide part is provided in a protruding manner, and a guide shaft protruding from the float is inserted into the guide part so as to be able to move up and down, and the float is raised by the pressure of the liquid flowing into the pump chamber from the conduit. The guide shaft is raised together with the float along the guide portion, and when the magnet on the guide shaft approaches the flow rate switch 7 in the cover, the switch is operated.

However, in the above pumps, the cover is fixed with multiple screws to an opening in the pump body facing the valve seat, so these openings can be used to inject priming water into the pump body or to clean the inside. This poses a problem in that it becomes cumbersome and requires an opening in the pump body exclusively for priming and cleaning, which increases the molding cost of the pump body.

In order to solve the above problem, the inventor of this application formed an opening in the pump body facing the valve seat for priming water and cleaning the inside, and a cap was removably screwed into the opening. However, they devised a pump in which a flow rate detection switch is attached to the cap and a magnet is attached to the float to operate the switch.

However, in the above-mentioned pump, since the flow rate detection switch was fixed to the cap, a new problem arose in that when the cap □ was rotated, the lead wires connected to the switch became entangled, making it difficult to attach and detach the cap.

(Object of the invention) This invention was made in view of the above circumstances, and
The purpose is to reduce molding costs by reducing the number of openings formed in the pump body, and to create a pump equipped with a flow rate detection switch where the lead wire of the flow rate detection switch will not become an obstacle when attaching or removing the cap. It is about providing.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a valve seat disposed between a pump chamber in a pump body and a pipe connected to the pump chamber; an opening provided in the pump body opposite to the valve seat; a cap removably screwed onto the opening for opening and closing the opening; and a reverse valve section for opening and closing between the pump chamber and the pipeline. comprising a float disposed on the valve seat, a magnet attached to the float, and is actuated by the approach and separation of the magnet as the float moves up and down, and is rotatable relative to the cap; A removably housed flow rate detection switch is provided.

(Function) Therefore, according to the present invention, the float is moved up and down by the liquid passing between the pump chamber and the pipe line, and the magnet is accordingly moved closer to and further away from the flow rate detection switch.
The switch is activated.

Also, when rotating the cap, due to the relative rotation between the cap and the flow rate detection switch or the removal of the detection switch,
This prevents the lead wires connected to the switch from tangling. Furthermore, by removing the cap, you can inject priming water through the opening or clean the inside of the pump body.

(Example) Hereinafter, an example in which the present invention is embodied in a household well water pump will be described in detail with reference to the drawings. As shown in FIG. 2, the pump main body 1 includes a body part 5 including a pump chamber 2 and a pair of pipes 3 and 4 located on both sides thereof, and a head part 6 fixed to the upper part of the body part 5. It consists of Inside the head part 6, there is a pump chamber 2 from the left piping 3.
A cavity 8 constituting a water suction pipe line 7 extending from the pump chamber 2 to the right side pipe 4 is formed, and a cavity 10 constituting a discharge pipe line 9 extending from the pump chamber 2 to the right side pipe 4 is formed.

In addition, a water intake port 3a and a discharge port 4a are formed at the lower part of the left side pipe 3 and the lower part of the right side pipe 4, respectively, and at the rear of the pump chamber 2, there is a water inlet port 3a and a discharge port 4a for rotating an impeller (shown in the figure) in the pump chamber 2. A motor 11 is provided. A pressure switch 12 is connected to the right pipe 4 and is activated in response to pressure fluctuations within the pipe that occur when a faucet connected to the outlet 4a is operated. Motor 11 is driven.

The head portion 6 is located on the axis of the left side piping 3.
As shown in FIG. 1, a cylindrical valve seat 13 made of brass is fixed in the left side cavity 8 of the valve seat 1, and a float 14 made of synthetic resin is attached to the valve seat 13 so as to be movable up and down. The float 14 includes a check valve 15 that opens and closes the valve seat 13 from above as the float 14 moves up and down, a plurality of guide pieces 16 that project downward from the check valve section 15, and a plurality of guide pieces 16 that project upward from the check valve section 15. The valve seat 13 is composed of a guide portion 17 in which each guide piece 16
is inserted into. Further, a packing 18 that can be brought into close contact with the upper end surface of the valve seat 13 is attached to the outer peripheral edge of the check valve portion 15.

The guide section 17 consists of four legs 19 projecting from the check valve section 15 at equal intervals, and a ring 20 connecting the upper ends of each leg 19. A hole 19a is formed in the hole 19a for passing foreign matter such as sand or rust, and
An annular magnet 21 is embedded in the ring 20. An opening 22 is formed in the head portion 6 facing the valve seat 13, and a can knob 23 is removably attached to the opening 22. This cap 23 has a disk-shaped base 2
4, a cylindrical portion 25 protruding downward from the base 24, and a guide shaft 26 protruding from the base 24 toward the valve seat 13 on the central axis of the cylindrical portion 25. It is screwed into the opening 22 at 25. A packing 27 is attached to the outer periphery of the proximal end of the cylindrical portion 25 so as to be in close contact with the upper end of the opening 22.

Further, the cap 23 is formed with a storage section 29 that opens at the upper end of the cylindrical projection 28 provided on the upper surface of the base 24 and closes at the tip of the guide shaft 26. Switch case 31 with built-in switch 30
is inserted.

That is, this switch case 31 includes a cylindrical part 32 that is inserted into the storage part 29, and a locking part 34 that is rotatably locked in a ring-shaped groove 33 provided on the outer periphery of the projection 28.
The switch case 31 is held by the cap 23 so as to be rotatable relative to the cap 23 by the engagement of the two members 33 and 34. The flow rate detection switch 30 is a reed switch equipped with a lead wire 35 extending from a switch case 31, and is turned on in response to the magnetic force of the magnet 21 when it approaches, and turned off when it is separated. , the drive of the motor 11 is controlled based on the operation.

Now, when operating the pump configured as above to discharge water from the faucet, when the faucet is opened,
The pressure switch 12 is turned on due to the accompanying pressure fluctuation in the discharge pipe 9, and in response, the motor 11 is driven and the impeller is rotated. As the impeller rotates, water flows through the pipe 3 and the check valve section 15 of the float 14.
The pump chamber 2 passes between the upper packing 18 and the valve seat 13.
The water is sucked into the water, passes through the discharge pipe 9, and is discharged from the faucet. When the flow rate of water in the water suction pipe 7 increases, the float 14 is raised together with the gasket 18 while being guided by the inner periphery of the valve seat 13 and the outer periphery of the guide shaft 26 due to the water pressure. When the ring 20 of the guide part 17 comes into contact with the inner surface of the base 24 of the camp 23 due to the upward movement, and the magnet 21 comes closest to the flow rate detection switch 30, the flow rate detection switch 30 is turned on by the magnetic force. At this time, the motor 11 is maintained in a driving state.

Thereafter, when the flow rate of water in the water suction pipe 7 decreases due to the closing operation of the faucet, the float 14 absorbs its own weight and magnet 2.
1, the float 14 overcomes the water pressure and descends, and the check valve portion 15 of the float 14 closes the valve seat 13.
Backflow of water is prevented. Further, as the float 14 descends, the magnet 21 separates from the flow rate detection switch 30. As a result, when the magnetic force of the magnet 21 acting on the switch 30 decreases, the switch 30 is turned off, and in response, the rotation of the motor 11 is stopped. When pressure fluctuation occurs again in the discharge pipe 9 based on the stoppage of the motor 11, the pressure switch 12 is turned off.

In this embodiment, the flow rate detection switch 30 is attached to the cap 23 via the switch case 31 so that it can be rotated relative to each other, so when the cap 23 is rotated, there is a gap between the switch case 31 and the cap 23. The switch 30 itself can be prevented from rotating, and the cap 23 can be smoothly attached and detached without getting the lead wire 35 entangled. Furthermore, by removing this cap 23 from the opening 22, priming water can be easily injected into the pump body 1 through the opening 23, and cleaning of the inside of the pump body 1 can also be easily performed. There is no need to form an opening in the pump body 1 exclusively for injection and cleaning (thereby, manufacturing costs can be reduced).

Note that this invention is not limited to the above embodiments,
It is also possible to embody it in the following manner.

That is, (al) the flow rate detection switch 30 is connected to the switch case 31
The flow rate detection switch 30 is detachably attached to the cap 23, and the flow rate detection switch 30 is removed from the cap when the cap 23 is rotated.

(bl) A ring-shaped groove is formed on the inner surface of the storage portion 29 of the camp 23, and a protrusion is formed on the outer periphery of the cylindrical portion 32 of the switch case 31 to fit into the ring-shaped groove so as to be relatively rotatable.

tc+ Embodying this invention in a pump other than for well water.

(Effects of the Invention) As detailed above, the present invention reduces the number of openings formed in the pump body to reduce molding costs, and also prevents the lead wire of the flow rate detection switch from becoming an obstacle when attaching or detaching the cap. It exhibits an excellent effect that there is no risk of

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of a pump embodying the present invention, FIG. 2 is a front view of the pump, and FIG. 3 is a perspective view of a float. DESCRIPTION OF SYMBOLS 1... Pump body, 2... Pump chamber, 7... Water suction pipe, 13... Valve seat, 14... Float, 15...
・Check valve part, 21... Magnet, 22... Opening, 23.
...Cap, 3゜...Flow rate detection switch.

Claims (1)

[Claims] 1. A valve seat (13) disposed between a pump chamber (2) in the pump body (1) and a pipe line (7) connected to the pump chamber (2); An opening (22) provided in the pump body (1) facing the valve seat (13), and a cap (23) removably screwed onto the opening (22) to open and close the opening (22). and a check valve part (15) that opens and closes between the pump chamber (2) and the pipe line (7).
and a float (1) disposed on the valve seat (13).
4), a magnet (21) attached to the float (14), and the magnet (21) as the float (14) moves up and down.
The cap (23) is actuated by the approach and separation of the cap (23).
1. A pump equipped with a flow rate detection switch, characterized in that it is provided with a flow rate detection switch (30) housed in a manner that is rotatable or detachable relative to the flow rate detection switch.