JP2020153722A - Flowrate switch and electric pump provided therewith - Google Patents

Abstract

To provide a flowrate switch which is actuatable with a small flow amount as a water flow is guided to the water receiving part of a paddle by a bulkhead, and an electric pump provided with the flowrate switch.SOLUTION: Provided is a flowrate switch 14 comprising a base 18 having a reed switch 23, a paddle casing 19 fixed to the base 18, a paddle 20 connected to the paddle casing 19, and switch activation means 27 for activating the reed switch 23, the paddle casing 19 having a paddle flow path 30 in which a fluid flows, a bulkhead 31 and a storage space 32, the paddle 20 having a water receiving part 24 and connected to the paddle casing 19, the water receiving part 24 being arranged on the paddle flow path 30, the paddle flow path 30 and the storage space 32 being separated by the bulkhead 31. Also provided is an electric pump 1 that includes the flowrate switch.SELECTED DRAWING: Figure 5

Description

The present invention relates to a flow rate switch or an electric pump with a flow rate switch.

Conventionally, an auto pump with a flow rate switch of this type is known to have a flow rate switch provided behind the discharge port (see, for example, Patent Document 1).

Hereinafter, the pump will be described with reference to FIG.

As shown in FIG. 13, the pump 101 includes an electric motor 102, a pump casing 103, and a flow rate switch 104.

A flow rate switch 104 is provided on the discharge port 105 side of the pump, and the paddle 106 of the flow rate switch 104 is arranged in a tubular flow path and is rotated by water flowing inside the pipe. At this time, the magnet 107 provided on the paddle 106 approaches the reed switch 108 provided on the outside of the flow path and operates to start the pump 101.

Japanese Unexamined Patent Publication No. 2009-36149

In such a conventional pump with a flow switch, the flow path is tubular and a uniform flow is guided to the paddle, so that the opening angle of the paddle is small when the water flow is small. Therefore, there is a problem that it is difficult to start the pump at a small flow rate.

Therefore, the present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a flow rate switch or an electric pump capable of a sensitive reaction to a water flow by providing a partition plate in the flow path.

Then, in order to achieve this object, the flow switch according to one aspect of the present invention includes a base having a reed switch, a paddle casing fixed to the base, a paddle connected to the paddle casing, and the reed. A flow switch comprising a switch activating means for activating the switch, wherein the paddle includes a water receiving portion, a paddle rotating shaft and a holding portion, is connected to the paddle casing via the paddle rotating shaft, and is connected to the paddle casing. The starting means is held by the holding portion, the water receiving portion is arranged on the paddle flow path through which the liquid flows, and the paddle casing includes a storage space for storing the holding portion, the paddle flow path, and a partition plate. The partition plate is characterized in that it partitions the storage space and the paddle flow path, thereby achieving the intended purpose.

According to the present invention, since the paddle can be easily opened even with a small amount of water by providing the partition plate, it is possible to provide a flow rate switch or an electric pump that can be activated by reacting sensitively even with a small flow rate. ..

Schematic of a side half cross section showing the electric pump according to the first embodiment of the present invention. Perspective view of the electric pump Front sectional view of the electric pump Side sectional view of the discharge port and the flow switch when the flow switch of the electric pump is not attached. Side sectional view of the discharge port and the flow switch in the state where the flow switch of the electric pump is attached. An exploded perspective view of the same flow switch Perspective view of the paddle (A) Top side perspective view of the paddle casing (b) Bottom side perspective view of the paddle casing Installation schematic diagram of the electric pump (A) Front sectional view of the electric pump (b) Side sectional view in the AA cross section Side sectional view showing the paddle casing and the paddle according to the second embodiment of the present invention. Side sectional view showing the paddle casing and the paddle according to the third embodiment of the present invention. Schematic diagram showing a conventional pump

The flow switch according to one aspect of the present invention is a flow switch including a base having a lead switch, a paddle casing fixed to the base, a paddle connected to the paddle casing, and a switch starting means for activating the lead switch. The paddle includes a water receiver, a paddle rotation shaft and a holding portion, is connected to the paddle casing via the paddle rotation shaft, a switch activation means is held by the holding portion, and the water receiving portion allows liquid to flow. Arranged on the paddle flow path, the paddle casing has a storage space for storing a holding portion, a paddle flow path, and a partition plate, and the partition plate has a configuration for partitioning the storage space and the paddle flow path.

According to this configuration, the water flow direction can be controlled by the partition plate to suppress the intrusion of the water flow into the storage space, so that the water flow can be efficiently guided to the paddle flow path and the paddle. As a result, the paddle can be easily opened even with a small amount of water due to the efficiently guided water flow. Therefore, it is possible to provide a flow rate switch or an electric pump that can be activated by reacting sensitively even at a small flow rate.

Further, the partition plate may have an inclined surface that inclines toward the water receiving portion toward the downstream side of the liquid flowing through the paddle flow path.

According to this configuration, the water flow flowing along the inclined surface is efficiently guided to the water receiving portion of the paddle. Then, when the water flow hits the water receiving part of the paddle, a stronger rotational moment is applied to the paddle. Therefore, the paddle can be easily opened even with a small amount of water, and the pump reacts sensitively even at a small flow rate to start and stop. Therefore, a high quality pump can be provided.

Further, the water receiving portion has a bowl shape that dents toward the downstream side of the liquid flowing through the paddle flow path, has a water receiving edge portion on the bottom surface, and has a water receiving edge portion on the paddle rotation shaft side of the water receiving portion. The inner surface of the partition plate and the inner surface on the flow path side at the upper end of the partition plate may coincide with each other.

According to this configuration, the water flow receives less resistance from the partition plate to the water receiving portion and flows smoothly, and is efficiently guided to the bowl shape of the water receiving portion of the paddle. Therefore, the entire bowl shape of the water receiving portion receives a force from the water flow and can be efficiently converted into a force to open the paddle, and the pump reacts sensitively even at a small flow rate to start and stop. Therefore, a high quality pump can be provided.

Further, the water receiving portion has a bowl shape that dents toward the downstream side of the liquid flowing through the paddle flow path, has a water receiving edge portion on the bottom surface, and the paddle casing is a paddle at a position facing the partition plate. When the wall surface forming the flow path has a contact portion and the liquid does not flow in the paddle flow path, the water receiving edge portion contacts the contact portion, and the other portion of the water receiving edge portion does not contact the paddle casing. It may be configured.

According to this configuration, the paddle and the paddle casing can be brought into contact with each other only at the contact portion, and the contact area between the paddle and the paddle casing can be reduced. Therefore, even if the paddle is closed for a long time, it is possible to prevent the paddle and the paddle casing from sticking to each other and reduce the malfunction of the flow rate switch. Therefore, a high quality pump can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 and 2, the electric pump 1 includes a motor 3 having a rotating shaft 2, an impeller 4 connected to the rotating shaft 2, and a pump casing 6 that forms an impeller portion flow path 5 around the impeller 4. Is equipped with.

A cooling fan 7 is provided on the protruding portion of the other end of the rotating shaft 2 on the side opposite to one end of the rotating shaft 2 to which the impeller 4 is fixed. A fan cover 8 is fixed to the motor 3 so as to cover the cooling fan 7. A terminal cover 9 is provided on the top of the motor 3, and the terminal cover 9 is fixed to the motor 3.

As shown in FIG. 3, the pump casing 6 includes a suction port 10, a suction port side flow path 11, a discharge port 12, and a discharge port side flow path 13.

The suction port 10 communicates with the impeller portion flow path 5 on the upstream side. The suction port side flow path 11 is a flow path from the suction port 10 to the impeller portion flow path 5. The discharge port 12 communicates with the impeller portion flow path 5 on the downstream side. The discharge port side flow path 13 is a flow path from the impeller portion flow path 5 to the discharge port 12.

The flow rate switch 14 is attached to the discharge port side flow path 13 of the pump casing 6.

The details of the mounting structure of the flow rate switch 14 are shown in FIG.

As shown in FIG. 4, the pump casing 6 includes a flow rate switch insertion portion 15 in a part of the discharge port side flow path 13, and has a flow rate switch installation surface 16 that intersects perpendicularly with the insertion direction into the flow rate switch insertion portion 15. I have.

The flow rate switch 14 is composed of an insertion structure portion 14a and a non-insertion structure portion 14b, and a part of the non-insertion structure portion 14b is provided with a joint surface 17 which is perpendicular to the insertion direction of the insertion structure portion 14a. The flow rate switch 14 is attached to the pump casing 6 by inserting the insertion structure portion 14a into the flow rate switch insertion portion 15 of the pump casing 6 and contacting and fixing the joint surface 17 to the flow rate switch installation surface 16.

Details of the flow rate switch 14 are shown in FIGS. 5 and 6.

As shown in FIGS. 5 and 6, the flow rate switch 14 includes a base 18, a paddle casing 19, a paddle 20 and a cover 21.

The insertion structure portion 14a is mainly composed of a paddle casing 19 and a paddle 20, and the non-insertion structure portion 14b is mainly composed of a base 18 and a cover 21.

The base 18 is provided with a substrate 22. The board 22 includes a reed switch 23, and has a circuit for turning on / off the electric pump 1 based on a signal from the reed switch 23.

The cover 21 is fixed to the base 18.

The paddle casing 19 is fixed to the base 18. The paddle casing 19 has a switch activation means 27 for activating the reed switch 23, a paddle flow path 30 through which a liquid flows, a partition plate 31, and a storage space 32.

The paddle flow path 30 and the storage space 32 are partitioned by a partition plate 31. A flow path edge 33 is provided around the paddle flow path 30.

With the paddle 20 connected to the paddle casing 19, the water receiving portion 24 of the paddle 20 is arranged on the paddle flow path 30 of the paddle casing 19.

The water receiving portion 24 has a bowl shape that is recessed toward the downstream side of the liquid flowing through the paddle flow path 30.

FIG. 7 shows a detailed view of the paddle. As shown in FIG. 7, the paddle 20 includes a water receiving portion 24, a paddle rotating shaft 25, and a holding portion 26. The switch starting means 27, such as a magnet, is fixed to the holding portion 26. The paddle 20 includes a spring 28. A water receiving edge 29 is provided on the bottom surface of the water receiving portion 24. The paddle 20 is connected to the paddle casing 19 via the paddle rotation shaft 25.

FIG. 8 shows the details of the paddle casing 19. As shown in FIG. 8, the flow path edge portion 33 has a contact portion 34. When the paddle 20 is closed, the contact portion 34 comes into contact with the water receiving edge portion 29, thereby reducing the contact area between the water receiving edge portion 29 and the flow path edge portion 33.

9 and 10 show an installation example of the electric pump 1 of the present embodiment and details of its operation.

As shown in FIG. 9, a water tank 36 is connected to the suction port 10 via a suction pipe 37 on the upstream side of the electric pump 1, and the inside of the water tank 36 is filled with water. A faucet 38 is connected to the discharge port via the discharge pipe 39 on the downstream side of the electric pump 1. The faucet 38 may be an on-off valve that can be opened and closed manually, or a shower faucet having an opening / closing mechanism at hand. The installation height of the water tank 36, or the height of the water surface 40 in the water tank 36, is set higher than the installation height of the electric pump 1, the suction pipe 37, the discharge pipe 39, and the faucet 38 which is the discharge part. By opening the faucet 38 from the state where the electric pump 1 is not started, a water flow 35 due to natural waterfall is generated in various pipes and inside the pump casing 6 of the electric pump 1.

As shown in FIG. 10A, in the electric pump 1, water is supplied into the pump casing 6, and the suction port 10, the suction port side flow path 11, the impeller section flow path 5, the discharge port side flow path 13, A water flow 35 is generated along the paddle flow path 30 of the flow rate switch 14 and the discharge port 12 in this order.

Further, as shown in FIG. 10B, when the water receiving portion 24 receives a force due to the water flow 35 generated in the paddle flow path 30, the paddle 20 rotates in the opening direction about the paddle rotation shaft 25. Then, when the switch starting means 27 provided in the paddle 20 approaches the reed switch 23, the reed switch 23 is activated. The start signal of the reed switch 23 is transmitted to the motor 3 via the substrate 22, and the motor 3 is started. When the motor 3 is started, the power of the motor 3 is transmitted to the impeller 4 via the rotating shaft 2, and the impeller 4 rotates.

In such a step, the electric pump 1 is activated and the water flow 35 can be increased. A force is always applied to the paddle 20 in the closing direction by the spring 28. Therefore, by closing the faucet 38, the water flow 35 is reduced, and the paddle 20 rotates about the paddle rotation shaft 25 in the closing direction. Then, when the switch starting means 27 provided in the paddle 20 moves away from the reed switch 23, the reed switch 23 is stopped and the electric pump 1 is stopped.

According to such a configuration, by partitioning the paddle flow path 30 and the storage space 32 by the partition plate 31, it is possible to prevent or suppress the intrusion of the water flow 35 into the storage space 32. Even if the initial water flow 35 due to free fall is small, by efficiently guiding the water flow 35 to the water receiving part 24 of the paddle flow path 30 and the paddle 20, the force received by the water receiving part 24 even if the amount of water is small. The paddle 20 can be easily opened. Therefore, it is possible to provide a flow rate switch 14 or an electric pump 1 that can be activated by reacting sensitively even with a small flow rate.

Since the contact area between the paddle casing 19 and the paddle 20 is reduced by the contact portion 34, it is possible to prevent the paddle 20 from sticking to the paddle casing 19. Therefore, the malfunction of the flow rate switch 14 can be reduced, and the electric pump 1 having higher quality can be provided.

(Embodiment 2)
In FIG. 11, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 11, the partition plate 31 includes an inclined surface 41 that inclines toward the water receiving portion 24 toward the downstream side of the liquid flowing through the paddle flow path 30.

According to such a configuration, the inclined surface 41 efficiently guides the water flow 35 flowing along the inclined surface 41 to the water receiving portion 24 of the paddle 20, and in particular, a large amount of water flow is directed to the tip side of the water receiving portion 24. Since it is guided, a strong water flow can be applied to the water receiving portion 24 of the paddle 20, and a stronger rotational moment is applied to the paddle 20. Therefore, the paddle 20 can be easily opened even with a small amount of water, and the electric pump 1 can react sensitively even with a small flow rate to start and stop. Therefore, it is possible to provide a high quality electric pump 1.

(Embodiment 3)
In FIG. 12, the same components as those of the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 12, the water receiving portion 24 of the paddle 20 has a first inclined portion 24a and a second inclined portion 24b. The second inclined portion 24b of the water receiving portion 24 is located closer to the paddle rotation shaft 25 than the first inclined portion 24a. The inner surface of the water receiving end portion 42 at the end position on the paddle rotation shaft 25 side of the second inclined portion 24b coincides with the inner surface on the flow path side of the upper end portion 43 of the partition plate 31.

According to such a configuration, since the inner surfaces are aligned, the water flow 35 flows entirely to the water receiving portion 24 without receiving resistance, so that the water receiving portion 24 efficiently receives the force from the water flow 35. Therefore, the entire water receiving portion 24 receives a force from the water stream 35 and can be efficiently converted into a force for opening the paddle 20, and the electric pump 1 can react sensitively even at a small flow rate to start and stop. Therefore, it is possible to provide a high quality electric pump 1.

Although the flow rate switch or the electric pump according to the present invention has been described above based on the embodiment, the present invention is not limited to the embodiment. As long as the gist of the present invention is not deviated, various modifications that can be conceived by those skilled in the art are applied to the present embodiment, and a form constructed by combining components in different embodiments is also included in the scope of the present invention. ..

The flow rate switch or electric pump according to the present invention is effective as a flow rate switch or electric pump or the like that can open and close the paddle even at a small flow rate and can be activated by reacting sensitively even at a small flow rate.

1 Electric pump 2 Rotating shaft 3 Motor 4 Impeller 5 Impeller part flow path 6 Pump casing 7 Cooling fan 8 Fan cover 9 Terminal cover 10 Suction port 11 Suction port side flow path 12 Discharge port 13 Discharge port side flow path 14 Flow switch 14a Insertion Structural part 14b Non-insertion structure part 15 Flow switch insertion part 16 Flow switch installation surface 17 Joint surface 18 Base 19 Paddle casing 20 Paddle 21 Cover 22 Board 23 Lead switch 24 Water receiving part 24a First inclined part 24b Second inclined part 25 Paddle Rotating shaft 26 Holding part 27 Switch starting means 28 Spring 29 Water receiving edge 30 Paddle flow path 31 Partition plate 32 Storage space 33 Flow path edge 34 Contact part 35 Water flow 36 Water tank 37 Suction pipe 38 Faucet 39 Discharge pipe 40 Water surface 41 Inclination Surface 42 Water receiving end 43 Upper end

Claims (5)

With a base with a reed switch,
With the paddle casing fixed to the base,
With the paddle connected to the paddle casing,
A flow rate switch provided with a switch activation means for activating the reed switch.
The paddle includes a water receiving portion, a paddle rotating shaft and a holding portion, and is connected to the paddle casing via the paddle rotating shaft.
The switch activation means is held by the holding portion and is held.
The water receiving portion is arranged on a paddle flow path through which a liquid flows.
The paddle casing has a storage space for storing the holding portion, the paddle flow path, and a partition plate.
The partition plate is a flow rate switch that partitions the storage space and the paddle flow path. The flow rate switch according to claim 1, wherein the partition plate has an inclined surface that inclines toward the water receiving portion toward the downstream side of the liquid flowing through the paddle flow path. The water receiving portion has a bowl shape that is recessed toward the downstream side of the liquid flowing through the paddle flow path, and has a water receiving edge portion on the bottom surface.
Claim 1 or 2 is characterized in that the inner surface of the water receiving edge portion on the paddle rotation shaft side of the water receiving portion and the inner surface on the flow path side at the upper end portion of the partition plate coincide with each other. Flow switch described in. The water receiving portion has a bowl shape that is recessed toward the downstream side of the liquid flowing through the paddle flow path, and has a water receiving edge portion on the bottom surface.
The paddle casing has a contact portion on a wall surface forming the paddle flow path at a position facing the partition plate.
Claim 1 is characterized in that, in a state where no liquid is flowing in the paddle flow path, the water receiving edge portion contacts the contact portion, and the other portion of the water receiving edge portion does not contact the paddle casing. The flow rate switch according to any one of 3 to 3. An electric pump provided with the flow rate switch according to any one of claims 1 to 4.