JP2020128893A - Float switch test jig - Google Patents

Abstract

To provide a float switch test jig for performing an activation test of a float switch from an inspection port or the like even if an inspector does not enter a tank, and performing an activation test of a float switch without imposing a burden on a lead wire of the float switch.SOLUTION: A test jig includes a long handle 20 and a scoop 30 provided with a concave portion 32 having a shape of a notch. By scooping a floating ball F of a float switch with the scoop 30 attached to the distal end of the long handle 20, it is possible to perform an activation test of the float switch even if an inspector does not enter a tank. By providing the concave portion 32 at an edge 31 of the scoop 30, when the floating ball F of the float switch is lifted, a lead wire C is inserted into the concave portion 32, and thus a load is not applied to the lead wire C.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a float switch test jig for performing a start or stop test of a float switch of a submersible pump installed in a water storage tank.

In many buildings, water storage tanks are installed as equipment for supplying water necessary for living and work. An automatic submersible pump, which plays a role of water supply and drainage, is installed in the tank as a device for properly maintaining the amount of water stored in the water storage tank. The automatic submersible pump is equipped with a float switch that operates by the stored water level so that the water level can be automatically maintained at an appropriate level. There are various types of float switches, but a float switch that uses floating balls F, such as the submersible pump WP shown in FIG. 8, is often used. This is because the float ball F of the float switch, which has the buoyancy to float in the liquid stored in the tank, floats as the water level rises, and when the float ball F of the float switch tilts, the switch operates to start or stop the submersible pump WP. Is.

For example, in the drainage pump, when the float F of the start float switch faces upward due to the rise of the water level, the drainage pump starts and drainage starts, and when the water level drops and the float F of the float switch floats downward, it stops. It is like this.

The float F of the float switch is mainly formed in a substantially spherical shape, and is connected to the submersible pump WP main body by a flexible lead wire C. The outer material of the float F of the float switch is mainly made of plastic resin, and an air layer for floating in water and a switch unit are arranged inside. There is an iron ball inside the switch unit, and as the float F of the float switch tilts, the iron ball rolls and the switch is operated by pushing the hinge-shaped switch.

By the way, since the float switch mechanically detects changes in the water level, as described above, there is a risk that it will not function properly if it is used for a long time due to wear of the internal mechanism or deterioration due to use. is there. In that case, the water storage tank cannot maintain an appropriate water level, and water overflows from the tank or there is a problem that necessary water cannot be stored. Therefore, at the time of periodical inspection of equipment, the submersible pump WP of the water storage tank operates normally or the float switch is artificially operated to perform a start-up test of the submersible pump WP. In such a start-up test, a method in which an inspector usually lifts the float ball F of the float switch by hand to check whether or not the floater F is to be started up. In case of a large water storage tank where the float F of the float switch cannot be reached from the inspection port etc., the inspector descends to the place where the submersible pump WP is installed with a ladder etc. in the tank and directly touch the float switch by hand. The floating ball F was lifted and the submersible pump WP was started to perform a start test. If the tank is too small for an inspector to enter, the float ball F of the float switch cannot be lifted directly by hand to perform a start test, so a hook attached to the end of a long handle such as a fishing rod. The starting test was conducted by hooking the hook attached to the tip of the handle to the lead wire C and changing the posture of the float ball F of the float switch.

JP, 2017-150399, A

However, in the method in which the inspector descends into the tank, it takes a lot of time to descend the basin to a position where the submersible pump WP is provided by a ladder or the like. Further, when going down, there is a risk of hitting the tank or installation in a narrow tank, slipping legs from the ladder, or stepping off, which poses a safety issue.

With a hook attached to the tip of a long handle like a fishing rod and hooked on the lead wire C connected to the float ball F of the float switch to start with the float ball F of the float switch facing upward, The floating ball F was heavy and sometimes did not rise upward, and it took time to work. Further, the lead wire C is pulled, which may damage the lead wire C.

Therefore, in order to solve the above-mentioned problems, an object of the present invention is to provide a float switch test jig capable of performing a start test of a float switch from an inspection port or the like even if an inspector does not enter the tank. And

In order to solve the above-mentioned problems, the invention according to claim 1 is a float switch test jig for performing a start or stop test of a float switch of a submersible pump that operates by floating floating balls. And a scooping part having an edge formed in a substantially circular shape at one end of the scooping part, wherein the scooping part has an end edge of the scooping part recessed toward the center. The float switch test jig is characterized in that a recessed portion is provided, and when the float ball of the float switch is picked up, the lead wire connected to the float ball is inserted into the recess.

According to a second aspect of the present invention, in the float switch test jig according to the first aspect, the scooping portion is detachably attached to the handle portion.

The invention according to claim 3 is the float switch test jig according to claim 1 or 2, characterized in that the handle portion is extendable.

According to the invention described in claim 1, the long handle is inserted into the tank through the inspection port of the water storage tank, and the float switch of the float switch attached to the tip of the float switch is scooped by the scooping part. You can scoop up and activate the float switch.

In this way, by scooping the float ball of the float switch with the scoop part attached to the long handle and activating the float switch, the inspector does not have to go down to the position where the float switch is in the tank. Start-up test becomes possible. Also, the lead wire of the float switch is inserted into the recess provided in the scooping part, so that the edge of the scooping part does not interfere with the lead wire and the float switch can be activated without burdening the lead wire. You can In other words, even if you do not pull the lead wire, you can lift the float ball of the float switch in the same way as the movement accompanying the rise in the water level, not only putting no load on the lead wire, but also improving the work efficiency. Become.

According to the second aspect of the present invention, by removing the scooping part, it is possible to replace the scooping part with a different size and shape, and it is possible to cope with the start-up test of the float switch of various shapes.

According to the third aspect of the present invention, since the handle portion can be expanded and contracted, the float switch test jig can be easily carried to an inspection point and can be stored compactly.

It is a front view which shows the float switch test jig which concerns on embodiment of this invention. It is a left side view showing a float switch test jig concerning an embodiment of the invention. It is a top view which shows the float switch test jig which concerns on embodiment of this invention. It is a bottom view which shows the float switch test jig which concerns on embodiment of this invention. It is a perspective view which shows the usage method of the float switch test jig of FIG. It is a figure explaining a mode that the float ball of a float switch is scooped by a scoop part, (a) is a front view of a scoop part, (b) is the left side of the scoop part which shows the state which scooped the float ball of a float switch. It is a figure, (c) is an AA sectional view of a scoop part which shows the state which lifted the float of a float switch, (d) The state which lifted the float of a float switch to the posture which a float switch operates. FIG. 4 is a cross-sectional view taken along the line AA of the scooping part. It is a front view which shows the scooping part of the float switch test jig which concerns on Embodiment 2 of this invention. It is a front view which shows the automatic submersible pump provided with the float switch.

Hereinafter, the present invention will be described based on the illustrated embodiments

(Embodiment 1)
1 to 5 show an embodiment of the present invention, FIG. 1 is a front view showing a float switch test jig 1 according to the embodiment of the present invention, and FIG. 2 shows the float switch test jig 1. FIG. 3 is a left side view, FIG. 3 is a plan view showing the float switch test jig 1, and FIG. 4 is a bottom view showing the float switch test jig 1.

As shown in FIGS. 1 to 4, the float switch test jig 1 includes an elongated handle portion 20 and a scooping portion 30 for scooping the float balls F of the float switch. It is attached to one end via a connecting fitting 40.

The handle portion 20 has an expandable and retractable structure, and includes a main tube 21, a middle tube 22 that can be slid and stored in the inside thereof, and a tip tube 23 that can be stored in the middle tube 22 by sliding. Become. The source tube 21, the middle tube 22 and the tip tube 23 are made of CFRP (carbon fiber reinforced resin). Although not shown, a taper surface is provided on the inner front end side of the source pipe 21 so that the inner diameter is narrowed toward the front end side, and the outer diameter is formed on the rear end side of the middle pipe 22 toward the rear end side. A tapered surface is provided so as to spread. As a result, when the inner tube 22 is swung out, these tapered surfaces are engaged with each other, so that the tapered state is fixed. Similarly, the front end side of the middle pipe 22 and the rear end side of the front end pipe 23 are also provided with taper surfaces so that they can be fixed in a swung-out state.

The scooping portion 30 is formed of a metal plate or a plastic resin in a bowl shape with the edge 31 being substantially circular. The inner diameter of the end edge 31 of the scooping portion 30 is formed to be slightly larger than the outer diameter of the float ball F of the float switch, and the depth of the bowl shape is formed to be about half or more of the sectional height of the float ball F. ..

As shown in FIG. 1, the scooping portion 30 is provided with a notch-shaped recess 32 from the edge 31 on the tip end side of the scooping portion 30 toward the center. The concave portion 32 is provided in a fan shape, which is provided in the central portion of the scooping portion 30, over approximately one sixth of the end edge 31 of the scooping portion 30. That is, the concave portion 32 widens on the end edge 31 side and narrows toward the center. The lead wire C connected to the float ball F of the float switch is inserted into the recess 32 when the float ball F of the float switch is scooped up by the scooping portion 30.

The scooping portion 30 is detachably connected to a connecting fitting 40, which will be described later, and a plurality of pieces having different sizes are prepared according to the shape of the float F of the float switch.

The connecting fitting 40 connects the tip of the handle portion 20 and the scooping portion 30, and is formed of a slender strip-shaped member made of stainless steel. One end of the connecting fitting 40 is attached to the tip side of the tip tube 23 of the handle portion 20, and the other end is attached to the rear end side of the scooping portion 30, that is, the opposite side of the recess 32, with a screw 41. ing.

The connecting fitting 40 of the present embodiment is bent from the tip of the tip tube 23 toward the bottom side of the scooping portion 30 so that the float switch can be easily scooped, and the end edge 31 of the scooping portion 30 extends in the longitudinal direction of the handle portion 20. Although it is arranged so as to be parallel to, the angle may be changed to an angle at which the operator can easily scoop the floating ball F of the float switch.

Next, the operation of the float switch test jig 1 will be described along with the flow of the start test of the float switch of the submersible pump WP using the float switch test jig 1.

The inspector swings out and extends the handle portion 20 of the float switch test jig 1, holds the base pipe 21, and inserts the float switch test jig 1 from the inspection port of the water storage tank. Then, the position of the float ball F of the float switch is visually confirmed, and as shown in FIG. 5, the float ball F of the float switch is scooped up from the side opposite to the point where the lead wire C of the float ball F is connected.

When the float F of the float switch is lifted, the lead wire C connected to the float F of the float switch is also pulled upward. The float ball F of the float switch has a part of the lead wire C fixed at a fixed position so that the float ball F does not float or drop above a certain level in order to keep the starting water level constant. The floating ball F changes its posture with the floating position of the float switch F as a fulcrum. Therefore, as shown in (b) to (d) of FIG. 6, when the float ball F of the float switch is scooped up by the scooping portion 30 and lifted, the connecting point of the lead wire C is pulled while being pulled by the lead wire C. The posture becomes downward, and the float switch operates. When the attitude of the float ball F of the float switch is changed and the connecting portion of the lead wire C faces downward, the lead wire C is inserted into the concave portion 32 provided in the scooping portion 30.

If it is confirmed by the float switch test jig 1 that the submersible pump WP is started by lifting the floating ball F of the float switch, it means that the float switch is functioning normally.

According to the float switch test jig 1 as described above, the float F of the float switch can be scooped up and lifted by the scooping portion 30 attached to the tip of the elongated handle portion 20, so that an inspector can check in the tank. Even if it does not enter, the start test of the float switch can be performed from the outside of the water storage tank.

The scooping portion 30 has a bowl-like shape that encloses the float ball F of the float switch, so that the lead wire C is loaded like a method of hooking the hook to the lead wire C and lifting the float ball F of the float switch. There is no. Furthermore, by inserting the lead wire C of the float F of the float switch into the recess 32 provided in the scooping portion 30, the end edge 31 of the scooping portion 30 and the lead wire C do not interfere with each other, and the lead wire C is bent. There is nothing to do. That is, when the float ball F of the float switch is picked up by the float switch test jig 1, the lead wire C moves in the same manner as the float ball F of the float switch floats as the water level rises. The floating ball F of the float switch can be lifted without imposing a burden on the lead wire C.

By disposing the mounting screw 41 near the inner edge 31 on the rear end side of the scooping part 30, the driver can be put in the recess 32 and turned, and the scooping part 30 can be easily replaced. ..

Further, since the handle portion 20 is extendable and retractable, it can be easily carried to an inspection point and can be stored compactly.

(Embodiment 2)
FIG. 7 is a front view of the scooping portion 30 according to this embodiment. In this embodiment, the configuration is different from that of the first embodiment in that the recess 32 of the scooping portion 30 is provided at a position of 90 degrees counterclockwise from the tip of the end edge 31 of the scooping portion 30. That is, the scooping section 30 of the float switch test jig 1 described in the first embodiment is replaced with the scooping section 30 of the present embodiment, and the description of the same configuration as that of the first embodiment will be given. Omit it.

A notch-shaped recess 32 is provided in the end edge 31 of the scooping portion 30 at a position 90 degrees counterclockwise from the tip end, and extends from the end edge 31 toward the center. Similar to the first embodiment, the recessed portion 32 is provided in a fan shape in which the center portion of the scooping portion 30 is provided over approximately one sixth of the bowl shape of the scooping portion 30, and the end edge 31 side is widened and the center is formed. It becomes narrower toward the direction. The lead wire C connected to the float ball F of the float switch is inserted into the recess 32 when the float ball F of the float switch is scooped up by the scooping portion 30.

According to this embodiment, even if the direction of the lead wire C connected to the float ball of the float switch is orthogonal to the direction of inserting the handle portion 20 into the tank, the scooping portion 30 Since the concave portion 32 is provided on the side surface side of the edge 31 of the float switch, the float F of the float switch can be scooped from the direction in which the lead wire C can be easily inserted into the concave portion 32.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and even if there is a design change or the like within a range not departing from the gist of the present invention, Included in the invention. For example, the scooping part 30 may be provided with a hole for draining water. According to such a scooping part 30, even if the floating ball F is scooped together with the water, the scooping part 30 does not collect water. Therefore, the operation can be performed easily and efficiently without feeling the weight and resistance of water. Further, since the scooping portion 30 can be made light in weight, the scooping operation becomes easier.

Further, in the above-described embodiment, a structure is adopted in which the handle 20 is fixed at a swing-out position like a swing-out type fishing rod. The pipe may be fixed by rotating the pipe housed in (1) to expand the member that presses the outer periphery and presses the inner peripheral surface of the outer pipe. With such a fixing method, the handle 20 can be fixed to an arbitrary length from the operator's hand according to the distance of the float F of the float switch.

The attachment method of the handle portion 20 and the scooping portion 30 is also connected via the connecting fitting 40 in the present embodiment, but the present invention is also included if the scooping portion 30 is directly attached to the tip of the handle portion 20.

From the inspection port of the water storage tank, toward the floating ball F of the float switch, depending on the angle and the distance at which the float switch test jig 1 is inserted, the attachment angle of the scooping portion 30 and the attachment angle of the scooping part 30 can be easily adjusted. Of course, even if the design of the length of the connecting fitting 40 is changed, it is included in the present invention.

1 Float switch test jig 20 Handle 21 Source tube 22 Medium tube 23 Tip tube 30 Scooping section 31 End edge 32 Recess 40 Connection fitting WP Submersible pump F Float switch (floating ball)
C lead wire

Claims (3)

In a float switch test jig for performing a start or stop test of the float switch of a submersible pump that operates by floating floating balls,
With a long handle,
A scooping part having an edge formed in a substantially circular shape at one end of the handle part,
The scooping part is provided with a recess in which the edge of the scooping part is recessed toward the center direction, and when the float ball of the float switch is scooped up, the lead wire connected to the float ball is provided. A float switch test jig which is inserted into the recess. The float switch test jig according to claim 1, wherein the scoop portion is detachably attached to the handle portion. The float switch test jig according to claim 1 or 2, wherein the handle portion is stretchable.

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