JP2586780Y2 - Flow detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow detecting device used for automatic start / stop control of a pump in an automatic water supply device.

[0002]

2. Description of the Related Art In a device for sucking well water and automatically supplying water, when the operation of a pump is controlled automatically, the pressure on the discharge pipe side of the pump drops below a predetermined pressure by using water at a terminal faucet. An operation control method is known in which a pump is started at a later time, and the pump is stopped when the flow rate falls below a predetermined flow rate by closing a terminal faucet. Such an automatic water supply device is provided with a pressure detection device and a flow detection device on the discharge side of the pump.

FIG. 3 shows a conventional flow detecting device. That is, in the figure, reference numeral 30 denotes a discharge pipe, and a horizontal part 30b is connected to a vertical rising part 30a of the discharge pipe 30, and a flow detecting device 4 is connected to the vertical rising part 30a.
0 is set.

[0004] The flow rate detecting device 40 has a float guide 42 extending vertically extending from a holder 41 screwed to the discharge pipe 30. The float guide 42 is pressed by the flow of the discharge water and rises. 43 is attached so as to be vertically movable. A permanent magnet 44 is fixed to the float 43, and the float guide 42
Has a built-in magnet switch 45. In addition,
46 denotes a stopper, and 47 denotes a cushion material.

When the float 43 is pushed up by the water fed to the vertical rising portion 30a of the discharge pipe 30, the flow detecting device 40 having such a structure raises the float 43 along the float guide 42. The permanent magnet 44 provided on the float 43 changes the magnetic field of the magnet switch 45 housed in the float guide 42, and the magnet switch 45 is closed. This causes the drive circuit of the pump to close.

When the flow rate of the discharge pipe 30a drops below a predetermined flow rate, the float 43 descends, the permanent magnet 44 changes the magnetic field of the magnet switch 45, and the magnet switch 45 opens. As a result, the drive circuit of the pump is opened, and the pump is automatically stopped.

However, such a conventional flow detecting device 4
Reference numeral 0 denotes a structure in which the float 43 provided with the permanent magnets 44 is pushed up by the discharge flow and rises, and therefore must be installed at the vertical rising portion 30a of the discharge pipe 30. In the discharge pipe 30, the presence of the vertical rising portion 30a is small, and therefore, the vertical rising portion 30a having a predetermined length must be constructed, and the structure becomes complicated.
In addition, there is a problem that the height is increased and the size is increased.

For this reason, it is desired to provide a flow rate detecting device at a position extending in the horizontal direction of the discharge pipe. That is, a paddle that rotates in accordance with the amount of water used is provided at a location of a horizontal flow in the discharge pipe, a permanent magnet is attached to this paddle, and a change in magnetic force due to the permanent magnet is magnetized according to the rotation of the paddle. If the flow is detected by a switch, the flow rate of the discharge pipe can be detected.

According to this, the discharge pipe of the pump includes:
Since there are a number of portions extending in the horizontal direction, it can be installed anywhere. In addition, since the portions extend in the horizontal direction, the height is not bulky and the size can be reduced.

[0010]

However, the paddle may vibrate violently in the discharge pipe under the influence of the turbulence of the pump, particularly when the pump is started. In this case, in the case of a magnet switch that operates according to a change in the magnetic force of the permanent magnet as in the above-described conventional case, the contacts come and go and are repeatedly turned on and off, so-called chattering occurs. As a result, not only the contacts are damaged, but also the pump is repeatedly started and stopped, which may cause a failure of the pump.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a flow rate detecting device which can eliminate a contact which causes chattering and can prevent a switch or a pump from malfunctioning. What you want to do.

[0012]

In order to achieve the above object, the present invention provides a flow rate detecting device installed in a discharge pipe connected to a pump and detecting a flow rate of a discharge liquid flowing through the discharge pipe. installed horizontally extending portion of the tube, and the flow detector body formed from synthetic resin, this
It is supported by the flow detector body and protrudes into the discharge pipe.
The flow of the discharge liquid flowing through the discharge pipe provided so as to exit
A paddle rotatable in the through direction, a permanent magnet attached to the paddle,

[0013] A part of the body of the flow rate detecting section is the paddle.
Shape so as to protrude into the discharge pipe toward the upstream side of
Formed, an element accommodating portion having an accommodating chamber inside , provided in the accommodating chamber corresponding to the position of the permanent magnet ,
A detecting element the distance between the permanent magnet is changed, consisting contactless electromagnetic transducer that changes the electrical output in response to a magnetic force change caused thereby that said paddle is rotated, the
Part of the body of the flow rate detector goes to the downstream side of the paddle
A stopper formed to protrude into the discharge pipe
And the pivot angle of the paddle is such that the paddle is
An outer shell of the element housing portion arranged on the upstream side between the
Regulated by the stopper located on the side
It is characterized by being made to be.

[0014]

According to the present invention, the paddle which is rotated by being pushed by the discharge liquid is installed at a portion extending in the horizontal direction of the discharge pipe.
Corner a small height of the installation space, moreover Ru can be installed anywhere position selected and of the discharge pipe. Besides,
The flow detection device is not limited to the flow detection body and paddle.
Detection element that works with a permanent magnet attached to the paddle
Element, element housing, and even stopper.
Therefore, only one component is required to be installed in the discharge pipe,
Assembly to the tube is easy. Moreover, the contactless electromagnetic transducer, whose electrical output changes according to the magnetic force change due to the displacement of the permanent magnet, is used as the detecting element. But
Without damage to the contacts. In addition, the flow detector
Utilizing the outer shell of the element housing part that houses the detection element,
Since the rotation angle of the paddle is regulated, the stopper structure and
Only the stopper formed on the downstream side
The structure of the body is simple. In addition, the element housing and
Both the upper and resin parts protrude from the flow rate detector body
Minutes, even if the paddle is suddenly pressed
Even if there is, the paddle hits the resin part, so the paddle
There is no danger that the gas will collide with the discharge pipe and be damaged.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. FIG. 2 shows a pump device used for an automatic water supply device, 1 is a pump, 2 is a discharge pipe,
Reference numeral 3 denotes a flow detecting device of the present invention, 4 denotes a check valve, and 5 denotes a pressure detecting device.

In this pump device, the pressure in the discharge pipe 2 is
For example, when the pressure drops below a predetermined pressure by opening a terminal water faucet (not shown), the pressure detecting device 5 detects this and activates the pump 1 and closes the terminal water faucet so that the inside of the discharge pipe 2 is closed. When the flow rate falls below a predetermined flow rate, the flow rate detection device 3 detects this and stops the pump 1. The flow rate detection device 3 will be described with reference to FIG.

A mounting pipe 6 is fixed to the discharge pipe 2 at a position extending in the horizontal direction by welding or the like, and a flange 7 is welded to an upper end of the mounting pipe 6. A flow detecting unit body 10 is fitted to the mounting pipe 6.
The flow detecting unit body 10 is
The liquid-tightness is maintained by a ring 11 and fixed by bolts (not shown).

The body 10 for detecting the flow rate is made of synthetic resin.
At the lower end, a part of the body 10 is
An element housing portion 20 formed so as to protrude into the inside is provided.
is there. The accommodation chamber 12 is formed inside the element accommodation section 20.
The detection element 13 is mounted inside the accommodation chamber 12.
It is . The detection element 13 is formed of a non-contact type electromagnetic conversion element such as a Hall element or a magnetoresistive element having a property in which an electric property changes when a surrounding magnetic field changes.

The lower part of the flow rate detecting unit body 10 has a discharge port.
The paddle 15 is supported so as to protrude into the outlet tube 2.
You. More specifically, the paddle 15 is made of a non-magnetic material such as a synthetic resin, and the upper end of the paddle 15 flows through the discharge pipe 2 to the lower part of the flow rate detection body 10 by the horizontal pin 16.
It is connected rotatably in the flow direction of the discharged liquid. That is,
The paddle 15 is swingably suspended by a horizontal pin 16 ,
It protrudes into the discharge pipe 2 . Thus, when the discharge water hits the paddle 15, the paddle 15 is pushed and rotated. And the flow sandwiching this paddle 15
On the upstream side in the water direction (discharge liquid flow direction),
The parts 20 are arranged to face each other. And paddle 15
Below the flow detection unit body 10 on the downstream side in the flowing water direction
Protrudes into the discharge pipe 2 from the same part on the flow-side edge
Stopper portion 21 formed as described above,
Outer shell of the element housing portion 20 on the upstream side sandwiching the paddle 15;
The rotation of the paddle 15 by the stopper 21 on the downstream side
The corners are regulated.

The paddle 15 has a permanent magnet 17 embedded therein. The permanent magnet 17 faces the detection element 13, and changes the magnetic force around the detection element 13 by changing the distance from the detection element 13.
An opening 18 is formed in the paddle 15 at a position where the permanent magnet 17 faces the detection element 13. In the drawing, reference numeral 19 denotes a display element, which is turned on when a large current is flowing through the detection element 13, that is, when the pump is stopped. Reference numeral 20 denotes a cover made of a transparent resin or the like that covers the display element 19. The operation of the flow detecting device 3 having such a configuration will be described.

When the water discharged from the pump 1 flows through the discharge pipe 2, the paddle 15 is pushed by the discharged water, so that the paddle 15 rotates so that the lower end is directed downstream. Therefore, the permanent magnet 1 held by the paddle 15
7 moves away from the detection element 13. Therefore, the magnetic force around the detection element 13 is weakened (the magnetic force is inversely proportional to the square of the distance to the magnet), and the detection element 13 changes its electrical characteristics. As a result, the detection element 13 turns on the drive circuit of the pump 1, and the pump 1 maintains the operating state.

That is, when the flow rate in the discharge pipe 2 becomes equal to or more than the predetermined flow rate, the paddle 15 rotates downstream, and thereby the pump 1 is driven. At this time, the display element 19 disappears.

When the amount of water used in the terminal faucet is reduced and the flow rate in the discharge pipe 2 is reduced, the paddle 15 is not pushed by the discharged water, so that the paddle 15 is rotated by the gravity to the vertical position. Return. For this reason, the permanent magnet 17 held by the paddle 15 approaches the detecting element 13 and
The magnetic force around the detection element 13 increases, and the electrical characteristics of the detection element 13 change. As a result, the detection element 13 turns off the drive circuit of the pump 1 and stops the operation of the pump 1.

That is, when the flow rate in the discharge pipe 2 becomes equal to or less than the predetermined flow rate, the paddle 15 rotates and returns, so that the pump 1 is stopped. At this time, the display element 19 turns on.

In the flow rate detecting device 3 having the above-described structure, since the flow rate detecting device 3 is attached to a portion extending in the horizontal direction in the discharge pipe 2, no vertical space is required. Since there are many places, there is no restriction on installation. So
In addition, the flow rate detection device 3 includes the flow rate detection
Permanently attached to paddle 15 as well as dollar 15
The detecting element 13, the element housing 20, and the
Since they are also integral with the stopper 21, they are installed on the discharge pipe 2.
Only one part is required, and the set for the discharge pipe 2
The attachment is easy.

Further, a permanent magnet 17 is provided on the paddle 15,
Since the detection element 13 changes the electrical output by the displacement of the permanent magnet 17, it becomes a non-contact switch,
Damage due to the mechanical contact / separation action of the contacts as in a conventional contact switch is prevented, and the life of the switch is extended.

When the paddle 15 is returned, the detecting element 13 causes a relatively large current to flow to activate the control unit of the pump, thereby acting to stop the pump. That is, when a large current is flowing through the detection element 13, the pump is stopped and the display element 19 is turned on. However, if the connection between the detection element 13 and the pump control unit provided outside is disconnected, for example, no current flows through the detection element 13 so that the control unit of the pump operates to operate the pump, and the display element 19 goes out. That is, when the connection is disconnected, the water supply amount is equal to or higher than the predetermined flow rate, that is, the paddle 15 is turned, and the display element 19 is turned off. If the pump is stopped, a contradiction occurs. For this reason, it can be determined that a failure has occurred, thereby enabling failure detection.

Then, even when the paddle 15 is suddenly subjected to a pressing force, such as when the pump is started, and the paddle 15 swings greatly and violently , the paddle 15 is still in the flow detecting section.
Stopper part made of the same synthetic resin as D10
21 and the rotation angle of the paddle 15 is regulated.
The dollar 15 does not collide with the discharge pipe 2 and is not damaged. I
Since the tip of the rocking is in a direction in which the tip is farther away from the detecting element 13, there is no possibility of collision with the detecting element 13.
Without giving a shock to the detection element 13, the failure of the detection element 13,
Disconnection of the lead wire can be prevented. When the flow rate decreases, the paddle 15 returns to rotation by gravity . At this time, the element housing portion 20 on the upstream side
The rotation angle of the paddle 15 is restricted. Since the paddle 15 has the permanent magnet 17, it returns with a large weight .
Things . The regulation of the rotation angle of the paddle 15 is checked.
Utilizing the outer shell of the element housing part 20 housing the output element 13
So that the stopper structure is formed on the downstream side.
Only the stopper 21 is needed, and the entire flow detecting device 3
The structure is simple.

Note that the detection element 13 is formed by a magnetoelectric conversion element, and the electric output changes in accordance with a change in the magnetic force. Therefore, the electric output changes in proportion to the amount of water supply. Therefore, such a linearly changing output characteristic is input to the control unit, and can be used as a signal for water supply control, such as a stop flow rate, a parallel start flow rate of a plurality of pumps, and an off-line flow rate. It is also possible to adjust or automatically set the flow rate value required for the water supply control in the section. The present invention is not limited to the above embodiment.

That is, if a magnetic body (not shown) is attached to the flow detecting body 10 so that the magnet 17 provided on the paddle 15 is attracted, when the magnet 17 separates, it becomes a resistance and returns. In this case, the recovery is urged, so that a hysteresis characteristic is generated. Therefore, the detection element 1
3 can be stabilized.

Further, the parallel pin 16 at the upper end of the paddle is provided at a position slightly displaced to the left from the state shown in the figure, and the whole is so brought into contact with the flow detecting unit body 10 that the paddle 15 is going to be in a vertical state when stopped. If it is tilted, the stopped state will be stable.

[0032]

[Effect of the Invention] As described in detail above, the flow rate detection device of the present invention
According to the arrangement , the flow is made using the horizontally extending part of the discharge pipe.
Since can be performed start-stop control of the pump based on the amount, but also requires only a small height of the installation space, Ru can be placed anywhere position selected and the discharge pipe. In addition, flow detection
The output device is not only a flow detector body and paddle, but also a paddle.
Detection element and element combination with the permanent magnet attached to the
Because it is integral with the container and the stopper,
Only one part is required to be installed.
The attachment is easy. Moreover, the contactless electromagnetic transducer, whose electrical output changes according to the magnetic force change due to the displacement of the permanent magnet, is used as the detecting element. without, prevent damage to the contact. In addition, the flow rate detection device
The paddle is rotated using the outer shell of the element housing
Since the angle is regulated, the stopper structure is downstream
Only the stopper formed on the side is required, the overall structure is simple
It only needs to be. In addition, both the element housing and stopper
Is part of the body of the flow rate detection part a protruding resin part?
Even if the pressing force is suddenly applied to the paddle,
Also, since the paddle hits the resin part, the paddle
There is no risk of damage due to collision.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a flow detection device according to an embodiment of the present invention.

FIG. 2 is a front view of a pump device in the automatic water supply device provided with the flow rate detection device.

FIG. 3 is a cross-sectional view showing a conventional flow detection device.

[Description of Signs] 1 ... Pump 2 ... Discharge pipe 3
... Flow detection device 4 ... Check valve 5 ... Pressure detection device 10 ... Flow detection unit body 13 ... Detection element (magnetoelectric conversion element) 15 ... Paddle 16 ... Parallel pin 17 ... Permanent magnet

Claims (1)

(57) [Scope of request for utility model registration] Claims: 1. A pump installed in a discharge pipe connected to a pump,
Flows through this discharge pipeDischarge liquidFlow rate detection device
In the arrangement, it is installed in a portion extending in the horizontal direction of the discharge pipe,Synthetic tree
A flow detection unit body formed of fat, It is supported by this flow rate detection unit body and
Discharge liquid flowing through the discharge pipe provided so as to protrude
Rotatable in the flow direction of A paddle, a permanent magnet attached to this paddle,Part of the body of the flow rate detector is directed to the upstream side of the paddle.
It must not be formed so as to protrude into the discharge pipe.
An element accommodating section having an accommodation chamber therein,  the aboveIn the above-mentioned accommodation room corresponding to the position of the permanent magnet
Re, The paddle rotates, and the paddle rotates with the permanent magnet.
The distance changes and the electrical output changes according to the change in magnetic force.
A detection element consisting of a non-contact type electromagnetic transducer that changesPart of the body of the flow rate detector is directed to the downstream side of the paddle.
It is formed so as to protrude into the inside of the discharge pipe
With a stopper, The rotation angle of the paddle is located upstream of the paddle
And a downstream side of the element housing portion.
To be restricted by the stopper
To A flow rate detection device characterized by the above-mentioned.