JP6969467B2 - Electrode type water level detector for submersible electric pumps and submersible electric pumps - Google Patents

Description

The present invention relates to a submersible electric pump and an electrode type water level detecting device for a submersible electric pump, and more particularly to a submersible electric pump capable of detecting a water level and an electrode type water level detecting device for a submersible electric pump.

Conventionally, a submersible electric pump capable of detecting a water level is known (see, for example, Patent Document 1).

The above-mentioned Patent Document 1 discloses a submersible electric pump including a pair of electrodes for detecting a water level and a submersible electric pump main body. The submersible electric pump detects the water level by raising the water level of the liquid in the drainage region to a pair of electrodes and conducting the pair of electrodes, and drives the submersible electric pump body based on the detection of the water level. It is configured.

Japanese Unexamined Patent Publication No. 2000-257584

However, in the submersible electric pump of Patent Document 1, the electric conductivity becomes low depending on the liquid quality and temperature of the liquid in the drainage region, and even if the water level rises to the pair of electrodes, the pair of electrodes is not conducted. There is a problem that the submersible electric pump body may not be driven.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to reliably drive the submersible electric pump body even in the case of a liquid having low electric conductivity. It is to provide a possible submersible electric pump and an electrode type water level detection device for a submersible electric pump.

In order to achieve the above object, the submersible electric pump in the first aspect of the present invention includes the submersible electric pump main body installed in the drainage region, the first electrode and the second electrode, and the water level in the drainage region is first. An electrode-type water level detector that detects the first water level by rising to the electrodes and the second electrode and conducting the first and second electrodes, and a float that moves in the vertical direction due to fluctuations in the water level in the drainage region. The submersible electric pump main body is driven based on the detection signal of the electrode type water level detector, and is provided with a conduction assisting portion provided on the float and including a conductor that is moved in the vertical direction with the movement of the float. When the float rises to the second water level, the continuity assisting portion is configured as such, and by bringing the conductor into contact with the first electrode and the second electrode of the electrode type water level detector, the first is made through the conductor. It is configured to conduct the electrode and the second electrode.

In the submersible electric pump according to the first aspect of the present invention, as described above, when the float rises to the second water level, the conduction assisting portion is attached to the first electrode and the second electrode of the electrode type water level detector. Is contacted with each other so that the first electrode and the second electrode are made conductive through the conductor. As a result, since the electric conductivity of the liquid in the drainage region is low, even when the first electrode and the second electrode are not conducted through the liquid, the conductor is moved to the first electrode and the second electrode as the float rises. The first electrode and the second electrode can be made conductive by contacting the electrodes. That is, it is possible to achieve mechanical conduction between the first electrode and the second electrode via a conductor that is not affected by the electrical conductivity of the liquid in the drainage region, instead of conducting through the liquid. As a result, the submersible electric pump body can be reliably driven even in the case of a liquid having a low electric conductivity. As a result, it is possible to reliably prevent the liquid from overflowing from the drainage region without driving the submersible electric pump main body.

In the submersible electric pump according to the first aspect, preferably, the conduction assisting portion is a conductor on the first electrode and the second electrode when the float rises to the second water level at a height higher than the first water level. Is configured to conduct the first electrode and the second electrode through the conductor. With this configuration, the continuity assisting unit can be used as an auxiliary configuration (backup configuration) when the first electrode and the second electrode are not conducted by the electrode type water level detector. That is, even if the first water level cannot be detected by the electrode type water level detector, the submersible electric pump main body can be reliably driven at the second water level by the continuity assisting unit.

In the submersible electric pump according to the first aspect, preferably, the electrode type water level detector further includes a detector main body provided with the first electrode and the second electrode, and the conduction assisting portion corresponds to the rise of the float. The conductor is configured to move linearly or rotationally with respect to the detector body. With this configuration, the movement (power) of the float can be easily used for the movement of the conductor by linearly moving or rotating the conductor.

In this case, preferably, the conductor is attached to the detector body so as to linearly move or rotate with respect to the detector body as the float rises. With this configuration, by attaching the conductor to the detector main body, the conductor can be stably moved with respect to the detector main body. Therefore, the conductor can be stably moved with respect to the first electrode and the second electrode provided in the detector main body. As a result, the orbits of the conductor toward the first electrode and the second electrode can be made more stable, so that the conductor can be reliably brought into contact with the first electrode and the second electrode.

In the configuration in which the electrode type water level detector includes the detector main body, preferably, the detector main body has a guide groove portion extending in the vertical direction, and the conduction assisting portion is formed so as to extend in the vertical direction and is on the upper end side. The float provided and the conductor provided on the lower end side are connected, and the connection portion arranged in the guide groove portion is further included, and the movement of the connection portion is guided by the guide groove portion, so that the conductor is conductive to the detector main body. It is configured to move the body in a straight line. With this configuration, the movement of the connecting portion is guided by the guide groove portion, so that the trajectory of the conductor toward the first electrode and the second electrode can be more stabilized. As a result, the conductor can be reliably brought into contact with the first electrode and the second electrode.

In this case, the float is preferably arranged directly above the detector body. With this configuration, the detector body directly under the float can be used as a stopper for restricting the downward movement of the float. The term "directly above" here means that the float and the detector main body are in a position where they overlap each other in the vertical direction, and the float is in a position above the detector main body.

In the configuration in which the continuity assisting portion includes the connecting portion, preferably, the first electrode and the second electrode are arranged so as to be arranged in the horizontal direction, and the conductor is arranged directly under both the first electrode and the second electrode. Has been done. With this configuration, the conductor can be brought into contact with the first electrode and the second electrode to conduct conduction only by moving the conductor directly above with the float. The term "directly below" here means that the first electrode, the second electrode, and the conductor are positioned so as to overlap each other in the vertical direction, and the conductor is located below the first electrode and the second electrode. do.

In the submersible electric pump according to the first aspect, the conductor is preferably formed in a brush shape. With this configuration, the wire (hair) portion of the conductor formed in a brush shape having a large surface area can surely secure the contact of the conductor with the first electrode and the second electrode.

In the submersible electric pump according to the first aspect, preferably, the conductor is configured to be tiltable when it comes into contact with the first electrode and the second electrode. With this configuration, when the conductor comes into contact with the first electrode and the second electrode, the conductor can be moved so that the conductor comes into contact with both the first electrode and the second electrode. , It is possible to surely secure the contact of the conductor with respect to the first electrode and the second electrode.

The electrode type water level detector for a submersible electric pump according to the second aspect of the present invention includes a first electrode and a second electrode, and the water level in the drainage region where the submersible electric pump main body is installed is up to the first electrode and the second electrode. An electrode-type water level detector that detects the first water level by rising and conducting the first and second electrodes, a float that moves in the vertical direction due to fluctuations in the water level in the drainage region, and a float are provided. , A conduction assisting part including a conductor that is moved in the vertical direction with the movement of the float, and the conduction assisting part is an electrode type water level when the water level in the drainage region reaches the second water level and the float rises. By bringing the conductor into contact with the first electrode and the second electrode of the detector, the first electrode and the second electrode are made conductive via the conductor.

In the electrode-type water level detection device for a submersible electric pump according to the second aspect of the present invention, as described above, the electrode-type water level detection of the conduction assisting portion is performed when the water level in the drainage region reaches the second water level and the float rises. The conductor is brought into contact with the first electrode and the second electrode of the vessel, and the first electrode and the second electrode are made conductive through the conductor. As a result, since the electric conductivity of the liquid in the drainage region is low, even when the first electrode and the second electrode are not conducted through the liquid, the conductor is moved to the first electrode and the second electrode as the float rises. The first electrode and the second electrode can be made conductive by contacting the electrodes. That is, it is possible to achieve mechanical conduction between the first electrode and the second electrode via a conductor that is not affected by the electrical conductivity of the liquid in the drainage region, instead of conducting through the liquid. Thereby, it is possible to provide an electrode type water level detecting device for a submersible electric pump capable of reliably driving the submersible electric pump main body even in the case of a liquid having a low electric conductivity. As a result, it is possible to reliably prevent the liquid from overflowing from the drainage region without driving the submersible electric pump main body.

According to the present invention, as described above, the submersible electric pump main body can be reliably driven even in the case of a liquid having a low electric conductivity.

It is a schematic diagram which showed the whole structure of the submersible electric pump by 1st Embodiment of this invention. It is a front view which showed the electrode type water level detection device of the submersible electric pump by 1st Embodiment of this invention. It is sectional drawing along the line 500-500 of FIG. It is a figure for demonstrating the drive of the submersible electric pump by the rise of a water level. It is a side view and the front view which showed the electrode type water level detection device of the submersible electric pump by 2nd Embodiment of this invention. It is a front view which showed the electrode type water level detection device of the submersible electric pump by the 3rd Embodiment of this invention. It is a front view of the partial break which showed the electrode type water level detection device of the submersible electric pump by 1st modification of 1st to 3rd Embodiment of this invention. It is a side view which showed the electrode type water level detection device of the submersible electric pump by the 2nd modification according to 1st to 3rd Embodiment of this invention.

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

[First Embodiment]
(Composition of submersible electric pump)
The first embodiment of the present invention will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the submersible electric pump 100 according to the first embodiment includes a submersible electric pump main body 101 and an electrode type water level detecting device 102. The electrode-type water level detection device 102 for a submersible electric pump (hereinafter, abbreviated as the electrode-type water level detection device 102) includes an electrode-type water level detector 103 and a continuity assisting unit 104.

The submersible electric pump 100 is configured to detect the water level in the drainage region H in which the submersible electric pump 100 is installed by the electrode type water level detecting device 102 (electrode type water level detector 103). The submersible electric pump 100 is configured to drive the submersible electric pump main body 101 based on the detection signal of the electrode type water level detecting device 102. That is, the submersible electric pump 100 is used as an automatic operation type submersible electric pump by the electrode type water level detecting device 102. Further, the submersible electric pump 100 is a non-automatic operation type underwater that is driven based on the ON / OFF of the power supply regardless of the water level of the drainage region H by removing the electrode type water level detection device 102 from the submersible electric pump main body 101. It can also be used as an electric pump.

The submersible electric pump 100 is configured to detect the water level by conducting the first electrode 7a and the second electrode 7b, which will be described later, of the electrode type water level detector 103 with the liquid in the drainage region H. However, even if the first electrode 7a and the second electrode 7b come into contact with the liquid in the drainage region H, the first electrode 7a and the second electrode 7b may not conduct. Specifically, when the liquid in the drainage region H is pure, rainwater, a low-temperature liquid, or other liquid having low electrical conductivity, the first electrode 7a and the second electrode 7b may not conduct. Therefore, the submersible electric pump 100 is configured to reliably conduct the first electrode 7a and the second electrode 7b for water level detection by using the continuity assisting unit 104. Details will be described later.

(Composition of submersible electric pump body)
As shown in FIG. 1, the submersible electric pump main body 101 is arranged in a motor 1, a rotary shaft 2, a pump chamber 3, an oil chamber 4, a mechanical seal 41, an oil lifter 42, and a pump chamber 3. It is equipped with an impeller 5. The submersible electric pump 100 is a vertical submersible electric pump in which the rotating shaft 2 extends in the vertical direction (Z direction). Further, the submersible electric pump main body 101 is a pump that sucks and pumps a liquid at a relatively low water level.

The motor 1 is hermetically sealed so that liquid does not enter from the outside. Further, the motor 1 drives the rotary shaft 2 to rotate. The motor 1 is configured to rotationally drive the impeller 5 via the rotating shaft 2. Further, the motor 1 includes a stator 11 and a rotor 12. The stator 11 has a coil and is arranged on the outer peripheral portion of the motor 1. Further, the stator 11 is configured to generate a magnetic field by being supplied with electric power from the cable 13. The rotor 12 is attached to the rotating shaft 2 and is arranged inside the motor 1 so as to face the stator 11 in the radial direction. Further, the rotor 12 is configured to be rotated by a magnetic field from the stator 11.

The rotating shaft 2 is configured to rotate by being driven by the motor 1. The rotating shaft 2 is configured to transmit the driving force of the motor 1 to the impeller 5. The rotation shaft 2 (impeller 5) is configured to rotate clockwise (J direction) in a plan view (when viewed from the Z direction). The rotating shaft 2 is rotatably supported by bearings 21 and 22. The rotary shaft 2 is arranged so as to extend from the motor 1 through the oil chamber 4 to the pump chamber 3. An impeller 5 is attached to one end 2a on the side opposite to the other end 2b on the motor 1 side of the rotary shaft 2.

An impeller 5 is arranged in the pump chamber 3. Further, the pump chamber 3 has a suction port 31 and a discharge port 32. The submersible electric pump 100 is installed in the drainage region H and sucks the liquid from the suction port 31 into the pump chamber 3. Then, the impeller 5 rotates to give velocity energy to the liquid sucked into the pump chamber 3, the velocity energy of the liquid is converted into pressure energy in the pump chamber 3, and the discharge port 32 is passed through the flow path 33. It is configured to discharge from.

The oil chamber 4 is arranged between the motor 1 and the pump chamber 3, and the oil chamber 4 is filled with oil. Further, a mechanical seal 41 is provided in the oil chamber 4. The mechanical seal 41 has sliding portions (not shown) on the load side (pump chamber 3 side) and the non-load side (opposite side to the pump chamber 3, that is, the motor 1 side), respectively. .. The sliding portion on the load side has a function of preventing (suppressing) the liquid in the pump chamber 3 from flowing into the oil chamber 4. Further, the sliding portion on the non-load side has a function of preventing (suppressing) the fluid containing oil in the oil chamber 4 from flowing into the motor 1 side. The sliding portion is lubricated by the oil filled in the oil chamber 4 and cooled so as not to be seized.

The oil lifter 42 is provided around the rotary shaft 2 of the oil chamber 4 and has a tubular shape surrounding the rotary shaft 2. The oil lifter 42 is configured to lift the oil upward as the rotating shaft 2 rotates. That is, the oil lifter 42 is configured to supply oil to the sliding portion on the counterload side of the mechanical seal 41. A through hole 42a is provided in the lower portion of the oil lifter 42. The through hole 42a is configured to guide oil to the inner peripheral side of the oil lifter 42. The oil lifter 42 is configured to return the oil lifted upward from the upper end side to the outer peripheral side of the oil lifter 42.

The impeller 5 is attached to one end 2a side of the rotary shaft 2 and is connected to the motor 1 via the rotary shaft 2. Further, the impeller 5 is attached to the rotary shaft 2 in a state of being electrically connected to the rotary shaft 2. The impeller 5 is arranged in the pump chamber 3. The center of the impeller 5 (and the rotating shaft 2) is arranged directly above the suction port 31 and on the side side of the discharge port 32.

(Configuration of electrode type water level detector)
As shown in FIGS. 1 and 2, the electrode type water level detector 103 of the electrode type water level detector 102 includes a detector main body 6, a first electrode 7a and a second electrode 7b, a guide groove portion 8, and a control board 10. And include.

In the electrode type water level detector 103, the water level in the drainage region H rises to the first electrode 7a and the second electrode 7b, and the liquid in the drainage region H conducts the first electrode 7a and the second electrode 7b. It is configured to detect 1 water level L1 (see FIG. 4B). The details will be described below.

<Configuration of detector body>
As shown in FIG. 1, the detector main body 6 has an L-shape extending along the upper surface and the side surface of the submersible electric pump main body 101 when viewed from the direction A described later (in a side view). Specifically, the detector main body 6 has a vertically long box-shaped first portion 61 extending vertically along the side surface of the submersible electric pump main body 101 and a horizontally long extending horizontally along the upper surface of the submersible electric pump main body 101. It has a box-shaped second portion 62 and the like.

In the second portion 62 of the detector main body 6, a first opening 62a for introducing the cable 13 inside and various cables (not shown) are introduced from the inside of the detector main body 6 to the inside of the submersible electric pump main body 101. A second opening 62b is provided. The inside of the detector main body 6 is kept in a liquidtight state by packings (not shown) installed in the first opening 62a and the second opening 62b, respectively.

A control board 10 and various cables (not shown) are arranged inside the first portion 61 of the detector main body 6. A first electrode 7a and a second electrode 7b are provided on the lower surface 61a of the first portion 61 of the detector main body 6. A guide groove 8 is provided on each of the pair of side surfaces 61b of the detector main body 6 facing each other.

<Structure of 1st electrode and 2nd electrode>
As shown in FIG. 2, both the first electrode 7a and the second electrode 7b have a rod shape protruding downward from the lower surface 61a of the detector main body 6. The first electrode 7a and the second electrode 7b are arranged side by side in the horizontal direction and separated from each other. The lower end of the first electrode 7a and the lower end of the second electrode 7b are arranged at substantially the same height as each other.

In the following, the direction in which the first electrode 7a and the second electrode 7b are lined up in the horizontal direction is defined as the A direction. Further, the direction from the second electrode 7b to the first electrode 7a is the A1 direction, and the opposite direction is the A2 direction. Further, the direction orthogonal to the A direction in the horizontal direction is defined as the B direction.

The first electrode 7a and the second electrode 7b are configured to conduct with each other by coming into contact with the liquid in the drainage region H. The first electrode 7a and the second electrode 7b are each connected to the control board 10 via a cable (not shown) inside the detector main body 6.

<Structure of control board>
The control board 10 is configured to control the drive of the submersible electric pump main body 101 based on the detection signal of the electrode type water level detector 103.

For example, the control board 10 is configured to drive the submersible electric pump main body 101 when the conduction between the first electrode 7a and the second electrode 7b continues for 1 second or longer. After that, the control board 10 is configured to stop the submersible electric pump main body 101 when the continuity between the first electrode 7a and the second electrode 7b is released and the released state continues for 1 minute or more.

<Structure of guide groove>
The guide groove 8 has a pair of configurations provided on the side surfaces 61b on both sides of the detector main body 6 in the A direction. The guide groove portion 8 has a function of guiding the movement of the continuity assisting portion 104 in the vertical direction with respect to the electrode type water level detector 103. The guide groove portion 8 has a C-shape (U-shape) in which the outer side (outside in the A direction) is open in a plan view. The guide groove portion 8 extends in the vertical direction.

Inside the guide groove portion 8, a connection portion 91, which will be described later, of the continuity assisting portion 104 is arranged.

In a plan view, the first electrode 7a and the second electrode 7b and the conductor 93 described later of the conduction assisting portion 104 are arranged between the pair of guide groove portions 8.

(Structure of auxiliary conduction part)
As shown in FIG. 2, the continuity assisting portion 104 of the electrode type water level detection device 102 generally has the first portion 61, the first electrode 7a, and the second electrode 7b of the detector main body 6 inward when viewed from the B direction. The detector body 6 is formed in a rectangular annular shape surrounding the first portion 61, the first electrode 7a, and the second electrode 7b so as to be arranged.

The continuity assisting portion 104 is configured to conduct the first electrode 7a and the second electrode 7b by a mechanical configuration when the first electrode 7a and the second electrode 7b are not conducted by the liquid in the drainage region H. .. The details will be described below.

The conduction assisting portion 104 includes a pair of connecting portions 91, a float 92, and a conductor 93. The connecting portion 91, the float 92, and the conductor 93 are integrally configured.

<Structure of connection part>
The pair of connecting portions 91 are arranged on both sides of the first portion 61 of the detector main body 6 in the A direction, respectively. The pair of connecting portions 91 are arranged inside the pair of guide groove portions 8, respectively. In the B direction, the first electrode 7a and the second electrode 7b are arranged so as to be sandwiched inside the pair of connecting portions 91.

The connecting portion 91 has a rod shape extending in the vertical direction (Z direction) along the side surface 61b of the end portion in the A direction of the first portion 61. The upper end of the connecting portion 91 is arranged above the upper surface 61c of the first portion 61 (in the Z1 direction). The lower end of the connecting portion 91 is arranged below the lower end of the first electrode 7a and the lower end of the second electrode 7b (in the Z2 direction). The connecting portion 91 has a rectangular horizontal cross-sectional shape along the C-shaped guide groove portion 8.

At the upper ends of the pair of connecting portions 91, a float 92 extending in the A direction is provided so as to connect the pair of connecting portions 91. At the lower ends of the pair of connecting portions 91, a conductor 93 extending in the A direction is provided so as to connect the pair of connecting portions 91. That is, the connecting portion 91 is configured to connect the float 92 provided on the upper end side and the conductor 93 provided on the lower end side.

<Float configuration>
The float 92 is configured to move in the vertical direction due to fluctuations in the water level of the drainage region H by being located on the water surface of the drainage region H. The float 92 is arranged directly above the first portion 61 of the detector main body 6. Therefore, the float 92 is configured to start rising at a water level higher than the upper surface 61c of the first portion 61. The connecting portion 91 and the conductor 93 are moved in the vertical direction together with the float 92.

The float 92 is configured so that the float 92 comes into contact with the upper surface 61c of the first portion 61 from the upper side (Z1 direction side) to restrict downward movement. Further, the float 92 is configured so that the conductor 93 comes into contact with the lower end of the first electrode 7a and the lower end of the second electrode 7b from the lower side to restrict the upward movement.

<Conductor composition>
The conductor 93 has conductivity. The conductor 93 is arranged directly below the first electrode 7a and the second electrode 7b (see FIG. 3). The conductor 93 is provided on the float 92 via the connecting portion 91. The conductor 93 is moved in the vertical direction as the float 92 moves.

The conductor 93 is configured to move linearly in the vertical direction with respect to the detector main body 6 as the float 92 rises. Specifically, when the float 92 rises (descends), the connecting portion 91 moves upward (downward) along the guide groove portion 8. As a result, the conductor 93 provided at the lower end of the connecting portion 91 is configured to linearly move upward (downward) with respect to the detector main body 6. The conductor 93 has a cylindrical shape extending in the A direction.

<Structure in which the first electrode and the second electrode are made conductive by the conduction assisting portion>
The continuity assisting portion 104 is configured to linearly move the conductor 93 with respect to the detector main body 6 in response to the rise of the float 92. At this time, the continuity assisting portion 104 is configured to linearly move the conductor 93 with respect to the detector main body 6 by guiding the movement of the connecting portion 91 by the guide groove portion 8. That is, the continuity assisting portion 104 is configured to move the conductor 93 from the lower side to the upper side toward the first electrode 7a and the second electrode 7b in response to the rise of the float 92.

When the float 92 rises to the second water level L2 at a height higher than the first water level L1, the conduction assisting portion 104 brings the conductor 93 into contact with the first electrode 7a and the second electrode 7b to conduct the conduction. It is configured to conduct the first electrode 7a and the second electrode 7b via the body 93. That is, when the first electrode 7a and the second electrode 7b are not electrically conducted to each other by the liquid in the drainage region H, the continuity assisting portion 104 causes the first electrode 7a and the second electrode 7b to be electrically conducted by the conductor 93. It is configured. That is, the continuity assisting unit 104 is an auxiliary configuration (backup configuration) for conducting the first electrode 7a and the second electrode 7b.

(Drive of submersible electric pump by rising water level)
Next, the driving of the submersible electric pump 100 by raising the water level in the drainage region H will be described with reference to FIGS. 4 (a), 4 (b), (c), and (d). Hereinafter, along with the rise in the water level, FIGS. 4 (a), (b), (c), and (d) will be described in this order.

In the state shown in FIG. 4A, the water level is lower than the height position of the lower end of the first electrode 7a and the lower end of the second electrode 7b, and the submersible electric pump main body 101 (see FIG. 1) is located. , Is stopped. In this state, the float 92 is in contact with the upper surface 61c of the first portion 61 of the detector main body 6. When the water level rises from the state of FIG. 4 (a), the state of FIG. 4 (b) is reached.

In the state shown in FIG. 4B, the water level rises to the first water level L1 reaching the lower end of the first electrode 7a and the lower end of the second electrode 7b, and the submersible electric pump main body 101 normally starts driving. Specifically, the electrode type water level detector 103 detects the water level by reaching the first water level L1 and conducting the first electrode 7a and the second electrode 7b by the liquid in the drainage region H. Then, the submersible electric pump main body 101 starts driving based on the detection signal of the electrode type water level detector 103. However, if the liquid in the drainage region H is a liquid having low electrical conductivity such as rainwater, the first electrode 7a and the second electrode 7b may not conduct, and in that case, the submersible electric pump main body 101 , The water level rises further without being driven. When the water level rises from the state of FIG. 4 (b), the state of FIG. 4 (c) is reached.

In the state shown in FIG. 4C, the water level rises to a predetermined height position higher than the upper surface 61c of the first portion 61 of the detector main body 6, and the float 92 starts to rise. That is, the conductor 93 starts moving from the lower side to the upper side toward the first electrode 7a and the second electrode 7b. When the water level rises from the state of FIG. 4 (c), the state of FIG. 4 (d) is reached.

In the state shown in FIG. 4 (d), the water level rises to the second water level L2 that brings the conductor 93 into contact with the first electrode 7a and the second electrode 7b, and the conductor 93 has the first electrode 7a and the second electrode 7b. Contact and conduct with each other. As a result, the submersible electric pump main body 101 starts driving.

(Effect of the first embodiment)
In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, when the float 92 rises to the second water level L2, the conductor 93 is attached to the first electrode 7a and the second electrode 7b of the electrode type water level detector 103. Is configured to conduct the first electrode 7a and the second electrode 7b via the conductor 93. As a result, since the electric conductivity of the liquid in the drainage region H is low, even when the first electrode 7a and the second electrode 7b are not conducted through the liquid, the conductor 93 is moved as the float 92 rises. The first electrode 7a and the second electrode 7b can be made conductive by contacting the first electrode 7a and the second electrode 7b. That is, it is possible to achieve mechanical conduction between the first electrode 7a and the second electrode 7b via the conductor 93, which is not affected by the electric conductivity of the liquid in the drainage region H, instead of conducting through the liquid. .. As a result, the submersible electric pump main body 101 can be reliably driven even in the case of a liquid having a low electric conductivity. As a result, it is possible to reliably prevent the liquid from overflowing from the drainage region H without driving the submersible electric pump main body 101.

Further, in the first embodiment, as described above, when the float 92 rises to the second water level L2 at a height higher than the first water level L1, the conduction assisting portion 104 has the first electrode 7a and the second. By bringing the conductor 93 into contact with the electrode 7b, the first electrode 7a and the second electrode 7b are made conductive via the conductor 93. Thereby, the continuity assisting unit 104 can be used as an auxiliary configuration (backup configuration) when the first electrode 7a and the second electrode 7b are not conducted by the electrode type water level detector 103. That is, even if the electrode-type water level detector 103 cannot detect the first water level L1, the continuity assisting unit 104 can reliably drive the submersible electric pump main body 101 at the second water level L2.

Further, in the first embodiment, as described above, the electrode type water level detector 103 further includes the detector main body 6 provided with the first electrode 7a and the second electrode 7b, and the conduction assisting portion 104 is the float 92. The conductor 93 is configured to move linearly with respect to the detector main body 6 as it rises. Thereby, the movement (power) of the float 92 can be easily used for the movement of the conductor 93.

Further, in the first embodiment, as described above, the conductor 93 is attached to the detector main body 6 so as to linearly move with respect to the detector main body 6 as the float 92 rises. As a result, by attaching the conductor 93 to the detector main body 6, the conductor 93 can be stably moved with respect to the detector main body 6. Therefore, the conductor 93 can be stably moved with respect to the first electrode 7a and the second electrode 7b provided on the detector main body 6. As a result, the trajectory of the conductor 93 toward the first electrode 7a and the second electrode 7b can be made more stable, so that the conductor 93 can be reliably brought into contact with the first electrode 7a and the second electrode 7b.

Further, in the first embodiment, as described above, the detector main body 6 has a guide groove portion 8 extending in the vertical direction, and the conduction assisting portion 104 is formed so as to extend in the vertical direction and is provided on the upper end side. The float 92 and the conductor 93 provided on the lower end side are connected to each other, and the connection portion 91 arranged in the guide groove portion 8 is further included, and the movement of the connection portion 91 is guided by the guide groove portion 8, so that the detector main body is used. It is configured to linearly move the conductor 93 with respect to 6. As a result, the movement of the connecting portion 91 is guided by the guide groove portion 8, so that the trajectory of the conductor 93 toward the first electrode 7a and the second electrode 7b can be further stabilized. As a result, the conductor 93 can be reliably brought into contact with the first electrode 7a and the second electrode 7b.

Further, in the first embodiment, as described above, the float 92 is arranged directly above the detector main body 6. As a result, the float 92 can be suspended at a water level higher than the first water level L1 detected by the first electrode 7a and the second electrode 7b. Further, the detector main body 6 directly under the float 92 can be used as a stopper for restricting the downward movement of the float 92. The term "directly above" here means that the float 92 and the detector main body 6 are overlapped with each other in the vertical direction, and the float 92 is located above the detector main body 6.

Further, in the first embodiment, as described above, the first electrode 7a and the second electrode 7b are arranged so as to be arranged in the horizontal direction, and the conductor 93 is the both of the first electrode 7a and the second electrode 7b. It is located directly below. As a result, the conductor 93 can be brought into contact with the first electrode 7a and the second electrode 7b to be made conductive by simply moving the conductor 93 directly upward together with the float 92. It should be noted that the position directly below here means that the first electrode 7a and the second electrode 7b and the conductor 93 overlap each other in the vertical direction, and the conductor 93 is below the first electrode 7a and the second electrode 7b. Means to be located in.

Further, in the first embodiment, as described above, the conductor 93 is configured to be tiltable when it comes into contact with the first electrode 7a and the second electrode 7b. As a result, when the conductor 93 comes into contact with the first electrode 7a and the second electrode 7b, the conductor 93 is moved so that the conductor 93 comes into contact with both the first electrode 7a and the second electrode 7b. Therefore, it is possible to reliably secure the contact of the conductor 93 with the first electrode 7a and the second electrode 7b.

[Second Embodiment]
The second embodiment will be described with reference to FIG. In this second embodiment, an example in which the conductor 293 is rotationally moved will be described, unlike the first embodiment in which the conductor 93 is linearly moved. In the figure, the same reference numerals are given to the parts having the same configuration as that of the first embodiment.

As shown in FIG. 5, the submersible electric pump 200 of the second embodiment includes a float 292, a conductor 293 that supports the float 292, and a hinge portion 294 that rotatably supports the conductor 293. The part 204 is provided.

The float 292 is attached to one end separated from the hinge portion 294 when viewed from the A direction. The hinge portion 294 rotatably supports the conductor 293 about a rotation center axis extending in the B direction. The first electrode 7a and the second electrode 7b are arranged so as to be in contact with the conductor 293 on the moving locus of the rotating conductor 293. The conductor 293 is configured to come into contact with the first electrode 7a and the second electrode 7b from below when the float reaches the second water level L2a.

(Effect of the second embodiment)
In the second embodiment, the following effects can be obtained.

In the second embodiment, as described above, the electrode type water level detector 103 further includes the detector main body 6 provided with the first electrode 7a and the second electrode 7b, and the conduction assisting portion 104 raises the float 292. Accordingly, the conductor 293 is configured to rotate and move with respect to the detector main body 6. As a result, the conductor 293 can be rotated and moved with respect to the detector main body 6 without providing the guide groove portion 8 in the detector main body 6, so that the configuration of the electrode type water level detection device 102 can be configured. Can be concise.

Further, in the second embodiment, as described above, the conductor 293 is attached to the detector main body 6 so as to rotate and move with respect to the detector main body 6 in response to the rise of the float 292. Thereby, by attaching the conductor 293 to the detector main body 6, the conductor 293 can be stably moved with respect to the detector main body 6. Therefore, the conductor 293 can be stably moved with respect to the first electrode 7a and the second electrode 7b provided on the detector main body 6. As a result, the trajectory of the conductor 293 toward the first electrode 7a and the second electrode 7b can be made more stable, so that the conductor 293 can be reliably brought into contact with the first electrode 7a and the second electrode 7b.

[Third Embodiment]
A third embodiment will be described with reference to FIG. In this third embodiment, unlike the first embodiment in which the conductor 93 is formed in a cylindrical shape, an example in which the conductor 393 is formed in a brush shape will be described. In the figure, the same reference numerals are given to the parts having the same configuration as that of the first embodiment.

As shown in FIG. 6, the submersible electric pump 300 of the third embodiment includes a conduction assisting portion 304 including a conductor 393.

The conductor 393 is formed in a brush shape. Specifically, the conductor 393 is formed by a rod-shaped portion extending in the A direction and a plurality of fine wire (hair) portions provided so as to project outward from the rod-shaped portion. The wire (hair) portion is configured to be elastically deformed when it comes into contact with the first electrode 7a and the second electrode 7b. As a result, the conductor 393 is configured to reliably abut and electrically connect to both the first electrode 7a and the second electrode 7b.

(Effect of the third embodiment)
In the third embodiment, the following effects can be obtained.

In the third embodiment, as described above, the conductor 393 is formed in a brush shape. As a result, the contact of the conductor 393 with the first electrode 7a and the second electrode 7b can be reliably ensured by the wire (hair) portion of the conductor 393 formed in the shape of a brush having a large surface area.

(Modification example)
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the first to third embodiments described above, an example in which the conductor is formed in a rod shape extending in the horizontal direction is shown, but the present invention is not limited to this. In the present invention, the conductor 493 of the conduction assisting portion 404 may be formed in a pipe shape as in the first modification shown in FIG. In this case, the conductor 493 is configured such that the connecting portion 491 is passed through the inside and supported by the connecting portion 491. Further, a cushioning material such as foam 495 is arranged between the connecting portion 491 and the conductor 493. As a result, the conductor 493 is configured to be tiltable with respect to the connection portion 491 by deforming the foam 495 when it comes into contact with the first electrode 7a and the second electrode 7b.

Further, in the first and third embodiments, the example in which the conductor is supported by the connecting portion is shown, but the present invention is not limited to this. In the present invention, as in the second modification shown in FIG. 8, a housing 596 may be provided in the continuity assisting portion 504, and the conductor 93 may be supported by the housing 596. In this case, the conductor 93 is arranged on the lower side of the housing 596 and directly below the first electrode 7a and the second electrode 7b. Further, the housing 596 has a rectangular shape, and at least the lower bottom surface is open so that the liquid can flow into the inside. Further, the housing 596 is provided with a float 92 on the upper side. Further, the detector main body 6 and the housing 596 are each provided with a guide configuration (not shown), and the housing 596 moves in the vertical direction along the detector main body 6 as the water level rises due to the guide configuration. It is configured to be possible.

Further, in the first and third embodiments, the example in which the float is arranged directly above the detector main body is shown, but the present invention is not limited to this. In the present invention, the float may be arranged on the side of the detector main body.

Further, in the first to third embodiments, an example is shown in which the lower end of the first electrode and the lower end of the second electrode are at substantially the same height position, but the present invention is not limited to this. In the present invention, the lower end of the first electrode and the lower end of the second electrode may be at different height positions.

Further, in the first to third embodiments, the first electrode and the second electrode are configured to be electrically conducted by the liquid in the drainage region at the first water level, and the height position is higher than the first water level. An example is shown in which the first electrode and the second electrode are made conductive at the second water level by a conductor, but the present invention is not limited to this. In the present invention, the first water level and the second water level may be configured to be at the same height position. That is, the water level at which the first electrode and the second electrode are conducted by the liquid in the drainage region may be the same as the water level at which the first electrode and the second electrode are conducted by the conductor. ..

Further, in the first and third embodiments, the example in which the connecting portion has a rectangular cross-sectional shape is shown, but the present invention is not limited to this. In the present invention, the connecting portion may have a shape other than the rectangular cross-sectional shape such as a circular cross-sectional shape.

6 Detector body 7a 1st electrode 7b 2nd electrode 8 Guide groove 91, 491 Connection part 92, 292 Float 93, 293, 393, 493 Conductor 100, 200, 300 Submersible electric pump 101 Submersible electric pump body 102 Electrode type water level Detection device 103 Electrode type water level detector 104, 204, 304, 404, 504 Conduction assisting part H Drainage area L1 1st water level L2, L2a 2nd water level

Claims (10)

The main body of the submersible electric pump installed in the drainage area and
Including the first electrode and the second electrode, the water level in the drainage region rises to the first electrode and the second electrode, and the first electrode and the second electrode are conducted to conduct the first water level. Electrode type water level detector to detect,
A conduction assisting portion including a float that moves in the vertical direction due to fluctuations in the water level in the drainage region and a conductor that is provided on the float and moves in the vertical direction with the movement of the float is provided.
The submersible electric pump main body is configured to be driven based on the detection signal of the electrode type water level detector.
When the float rises to the second water level, the conduction assisting portion brings the conductor into contact with the first electrode and the second electrode of the electrode type water level detector, thereby passing through the conductor. A submersible electric pump configured to conduct the first electrode and the second electrode. The conduction assisting portion causes the conductor to come into contact with the first electrode and the second electrode when the float rises to the second water level at a height higher than the first water level. The submersible electric pump according to claim 1, wherein the first electrode and the second electrode are made conductive via a conductor. The electrode type water level detector further includes a detector body provided with the first electrode and the second electrode.
The submersible electric pump according to claim 1 or 2, wherein the continuity assisting portion is configured to linearly move or rotate the conductor with respect to the detector main body in response to an increase in the float. .. The submersible electric pump according to claim 3, wherein the conductor is attached to the detector body so as to linearly move or rotate with respect to the detector body in response to the rise of the float. The detector body has a guide groove portion extending in the vertical direction.
The continuity assisting portion is formed so as to extend in the vertical direction, connects the float provided on the upper end side and the conductor provided on the lower end side, and further includes a connecting portion arranged in the guide groove portion. The submersible electric pump according to claim 3 or 4, wherein the guide groove portion guides the movement of the connection portion to linearly move the conductor with respect to the detector main body. The submersible electric pump according to claim 5, wherein the float is arranged directly above the detector main body. The first electrode and the second electrode are arranged so as to be aligned in the horizontal direction.
The submersible electric pump according to claim 5 or 6, wherein the conductor is arranged directly under both the first electrode and the second electrode. The submersible electric pump according to any one of claims 1 to 7, wherein the conductor is formed in a brush shape. The submersible electric pump according to any one of claims 1 to 8, wherein the conductor is configured to be tiltable when in contact with the first electrode and the second electrode. The water level in the drainage region including the first electrode and the second electrode and in which the submersible electric pump main body is installed rises to the first electrode and the second electrode, and the first electrode and the second electrode are conducted. By doing so, an electrode type water level detector that detects the first water level and
A conduction assisting portion including a float that moves in the vertical direction due to fluctuations in the water level in the drainage region and a conductor that is provided on the float and moves in the vertical direction with the movement of the float is provided.
When the float rises to the second water level, the conduction assisting portion brings the conductor into contact with the first electrode and the second electrode of the electrode type water level detector, thereby passing through the conductor. An electrode-type water level detection device for a submersible electric pump, which is configured to conduct the first electrode and the second electrode.

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