JPH0728657Y2 - Water flow switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Use] The present invention enables insertion into a water flow switch, especially a circuit in which a detection flow path is bent, and in this case, can accurately detect the presence or absence of water flow. It concerns a water flow switch.

[Prior Art and its Problems] As a means for detecting the presence or absence of a water flow, a rocking piece that moves from an initial position to a final position when a water flow occurs is housed in a flow path, and a permanent magnet is attached to this rocking piece. It is well known that a magnetically sensitive switch such as a reed switch is provided at a position corresponding to the final position of the rocking piece. In this conventional device, a schematic structure as shown in FIG. 4 is provided. Take

As shown in the figure, in this structure, a swinging piece (2) having a permanent magnet (20) is incorporated in a main body (1) that penetrates a flow path (10). At the initial position (inoperative position) of the piece (2), it is in a posture of traversing the flow channel (10), and at the final position (actuated position), it swings up and down in the direction along the flow of the flow channel (10). It is like this. Then, at this final position, the permanent magnet (20) provided on the swinging piece (2) faces and approaches the reed switch (3) provided outside the main body (1).

Therefore, when the flow rate passing through the flow path (10) is less than or equal to the working flow rate of the water flow switch, the swinging piece (2) is in a horizontal posture in which it crosses the flow path (10), and when the working water quantity is exceeded, the swinging piece (2) moves upward. When it swings to, and when it exceeds the intermediate point, it swings all at once to the final position. From the initial position to the intermediate position, the acting force required for rocking the rocking piece (2) is relatively large, but beyond this, the moment for rocking is the required moment in the previous process. Because it is much smaller than Therefore, in this conventional device, a chattering phenomenon or the like is less likely to occur in the operation of the swing piece (2).

However, when this conventional device is inserted into a bending circuit, there are problems that the circuit configuration becomes complicated and the space required for inserting the water flow switch becomes large.

This is because in the case of the above-mentioned conventional type water flow switch, in order to realize the smooth and reliable operation of the rocking piece (2), the rocking piece (2) should be in a horizontal posture at the initial position. In addition, it is necessary to take an upright state or a posture close to this at the final position, and as shown in FIG. This is because it must be L), and it is necessary to bend the pipe under the condition that the straight flow path portion is secured.

On the other hand, as a water flow switch having a bent channel in the main body (1), as shown in FIG. 5, a rocking member provided with a permanent magnet (20) at the bending point of the flow channel (10) in the main body (1). A structure in which the moving piece (2) is incorporated is proposed as Japanese Utility Model Laid-Open No. Sho 62-124438. In this one, the swinging piece (2) has a horizontal posture as the initial posture, and from this state, the tip thereof is When the flow rate in the main body reaches the set flow rate, the rocking piece tilts from the initial posture to the final posture. In this final posture, the reed switch (3) is brought into a water flow detection state while approaching and approaching the reed switch.

In this case, since the swinging piece (2) is housed in the bent flow path, the water flow switch as a whole can be miniaturized. However, in this case, the chattering phenomenon is likely to occur.

This means that at the bending point of the flow path (10) in the main body, the oscillating piece (2) has its fulcrum located on the opposite side of the outlet part (11) and has a horizontal posture in its initial posture. Furthermore, regardless of the flow rate, the direction of the water flow in the inflection point is a constant path from the inlet portion (12) to the outlet portion (11) through the gap flow passage on the tip side of the rocking piece (2). Therefore, the difference between the moment when the swing piece (2) starts swinging from the initial posture and the moment for swinging the swing piece (2) from this state to the final posture is relatively small. And
As a result, an unstable intermediate state that reciprocates between the initial posture and the final posture is likely to occur under the condition that the flow rate in the flow path (10) is near the set flow rate.

In order to improve such inconvenience, a water flow guide plate is provided on the free end side of the rocking piece at the bending point to increase the water flow pressure for maintaining the final posture. It has been proposed as Japanese Utility Model Laid-Open No. 60-10248, but in this case, it is necessary to form a guide plate inside the bending point, which complicates the internal structure and causes a large pressure loss in the main body.

The present invention bends the flow path (10) in the main body (1) from the lower inlet part (12) to the lateral outlet part (11), and the bending point of the flow path (10) is Has a swing piece (2) which is swingable in the vertical direction and equipped with a permanent magnet (20), and is located close to the final position of the swing piece (2) outside the main body (1) so as to face it. In the water flow switch of the type in which the reed switch (3) is provided at the position where the water flow switch is inserted, even if the water flow switch is inserted at the bending point of the bent pipe, the space occupied by this portion does not become large, and the water flow switch has a simple structure. It is an object of the present invention to prevent the chattering phenomenon from occurring in the operation of and to reduce the pressure loss at this bending point.

[Technical Means] The technical means of the present invention, which has been taken to solve the above-mentioned technical problem, is to "locate the outlet part (11) near the free end of the swinging piece (2) and to swing the swinging piece (2). ) Is located in the vicinity of the flow passage wall on the opposite side of the outlet portion (11), and the inlet of the flow passage (10) is located below the intermediate portion between the fulcrum (21) and the outlet portion (11). The portion (12) is opened, and the swinging range of the swinging piece (2) is set to the fulcrum from the initial position where the tip of the swinging piece (2) is in contact with the bottom wall of the flow path in a water flow path blocked state. Is set within the range up to the final position where the tip end is in the upward open inclination posture, and the working flow rate is less than the working point between the end of the swinging piece (2) on the fulcrum (21) side and the wall surface facing it. Has formed a gap that allows the flow of

[Operation] The technical means of the present invention operates as follows.

Under the condition of operating flow rate or less, the rocking piece (2) has a flow path such that the tip of the rocking piece blocks the path from the inlet part (12) in the flow path (10) on the side opposite to the rocking fulcrum. It is in contact with the bottom wall. On the other hand, since there is a gap between the end of the oscillating piece (2) on the fulcrum (21) side and the flow passage wall surface facing the end, there is a gap that allows a flow of not more than the working flow rate. The flow flowing in from the lower inlet portion (12) is restrained from flowing toward the tip side of the rocking piece (2) and is guided by the rocking piece (2) to be directed rearward to form a fulcrum (21). It flows out from the upper region of the rocking piece (2) to the outlet part (11) through a gap between the wall surface and the facing wall surface. (See FIG. 1) After that, when the flow rate of the flow path (10) approaches the working flow rate, the oscillating piece (2) is generated by the fluid pressure of the upward component fluid at this time.
Is swung upwards. At this time, the oscillating piece (2) changes its posture in a state of being tilted upward (upward from the fulcrum) as the oscillating piece moves, and the flow guiding action of the oscillating piece (2) is changed from the rear side (fulcrum side). The flow direction changes to the front (the tip side), and until then, the direction of the flow that has flowed to the space above the rocking piece (2) through the gap between the fulcrum (21) and the opposing wall is the rocking piece ( It rapidly changes so that it flows along the lower surface of 2).

Therefore, in this state, the entire flow pressure acting on the rocking piece (2) acts to maintain the rocking piece (2) at the final position. (See FIG. 2) Then, in this state, the permanent magnet (20) faces and approaches the reed switch (3) so that the reed switch (3) operates, and the flow rate in the flow path (10) reaches the working flow rate. This is output as an electric signal.

[Effects] The present invention having the above-described configuration has the following unique effects.

The flow in the vicinity of the rocking piece (2) below the operating flow rate flows so as to bypass the rocking piece (2), and after the operation of the rocking piece (2), that is, above the working flow rate, the flow path (10 Since the flow in () flows so as to maintain the rocking piece (2) at the final position, the chattering phenomenon may occur even if the rocking piece (2) is housed at the bending point of the flow path (10). This is less likely to occur, and the swinging piece (2) will operate smoothly and reliably.

Incidentally, in order to reduce the chattering phenomenon, a guide plate for effectively acting the pressure of the water flow on the rocking piece (2) is formed inside the bending point.
Compared to the invention of No. 8, the above structure has more reliable chattering prevention effect, and since it is not necessary to incorporate a guide plate inside the bending point, the internal structure can be simplified and the guide plate is incorporated. There is no problem of increased pressure loss as in the case of

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the embodiment shown in FIGS. 1 to 3, a rectangular empty chamber (A) for accommodating the rocking piece (2) is formed in the main body (1), and the outlet portion is provided on the side wall of this empty chamber (A). The (11) is opened and the inlet (12) is opened in the bottom wall, and the upper surface of the vacant chamber (A) is closed by a lid plate (30) formed separately.

The vacant chamber (A) has a rectangular parallelepiped shape with a constant width in a direction perpendicular to the axis of the outlet part (11), and is shaken by a bracket (4) connected to the lower surface of the cover plate (30). Moving piece (2)
Is pivotally supported.

As shown in FIG. 3, the bracket (4) is provided with a pair of support plate portions (41) (41), and these are provided in the empty chamber (A).
It hangs parallel to the side wall. Then, a fulcrum (21) is provided at a lower part of the rear end of the support plate (41) (41) with a constant distance from the rear wall (13) of the vacant chamber (A), and the fulcrum (21) is rocked to this fulcrum (21). The moving piece (2) is pivotally supported.

The oscillating piece (2) is constructed by a rectangular plate-shaped body as a whole, and a permanent magnet (20) is attached and fixed to the upper surface in the middle thereof. Then, bent pieces (22) (22) that bend downward are hung in parallel in the rear area of the bent pieces (22).
The shaft that serves as the fulcrum (21) penetrates through (22). As a result, the swing piece (2) can swing about the fulcrum (21).

The tip of the rocking piece (2) is bent slightly downward, and as shown in FIG. 1, the tip of the rocking piece (2) is at the initial position of the rocking piece (2). It is designed to be in contact with the bottom in the vicinity of 12). Then, the middle inclination angle of the swing piece (2) in this state is set to about 30 degrees, and at the same time, the interval between the rear end of the swing piece (2) and the rear wall (13) is the working flow rate. The intervals are set to allow the following flows.

Further, as shown in FIG. 2, at the final position of the swing piece (2), the middle tilt angle of the swing piece (2) is tilted upward by about 30 degrees. ing. Also, in this state, the bent portion at the tip of the swinging piece (2) is
The bending angle and the inclination angle at the final position are set to predetermined values so as to extend horizontally toward 1).

Since the fulcrum (21) is provided on the pair of bending pieces (22) (22) hanging from the rear end of the swinging piece (2), the fulcrum (21) is located after the swinging piece (2) at the final position. The gap between the end and the rear wall (13) becomes smaller than that in the initial position of the swing piece (2). Therefore, when the swinging piece (2) is at the final position, it becomes difficult for the fluid to flow into the gap.

Next, the reed switch (3) is attached and fixed to the upper surface of the lid plate (30), and its mounting position is the permanent magnet (20) attached to the upper surface of the swinging piece (2) at the final position. ) Is in a position close to and facing.

The lid plate (30) includes a bracket (4), a swing piece (2) pivotally supported by the bracket (4), and a reed switch (3).
Are assembled in advance, and when this is attached to the open upper end portion of the vacant chamber (A), the respective parts are assembled in a predetermined relationship. Therefore,
In this embodiment, the built-in parts can be easily assembled in the vacant chamber (A).

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, an explanatory view of the swinging piece (2) at an initial position, FIG. 2 is an explanatory view when the swinging piece (2) is at a final position, and FIG. Is a sectional view taken along line XX,
FIG. 5 is an explanatory view of a conventional example, and FIG. 5 is an explanatory view of another conventional example. In the figure, (20) ... permanent magnet (2) ... oscillating piece (1) ... main body (10) ) ...... Flow path (3) ...... Reed switch (21) ...... Support point (11) ...... Exit part (12) …… Inlet part

Claims (1)

[Scope of utility model registration request] 1. A flow path (10) in a main body (1) is bent from a lower inlet part (12) to a lateral outlet part (11), and the bending point of the flow path (10) is vertically bent. Body (1) with a built-in oscillating piece (2) that can swing in any direction and that has a permanent magnet (20)
In the water flow switch of the type in which the reed switch (3) is provided at a position facing and close to the final position of the swinging piece (2) outside of, the outlet part (11) is located near the free end of the swinging piece (2). And the fulcrum (21) of the rocking piece (2)
Is located in the vicinity of the flow path wall on the side opposite to the outlet part (11), and the inlet part (12) of the flow path (10) is opened below the intermediate part between the fulcrum (21) and the outlet part (11). Then, the swinging range of the swinging piece (2) is opened from the initial posture in which the tip end of the swinging piece (2) is in contact with the bottom wall of the flow path in the water flow path blocking state, and the tip end is upward with respect to the fulcrum. It is set to a range up to the final position where it tilts, and a flow of less than the working flow rate is allowed between the fulcrum (21) side end of the rocking piece (2) and the flow path wall surface facing it. A water flow switch that creates a gap to operate.