Submerged pump

Abstract

To provide a submerged pump that allows a submerged pump body to be operated at a desired water level, and the submerged pump body to be stopped in operation at appropriate timing.SOLUTION: A submerged pump is such that: a water level detection member 130 includes a first detection part 131 for detecting a first water level, and a second detection part 132 for detecting a second water level; a first distance between the first detection part 131 and the second detection part 132 in a vertical direction in a state that the water level detection member 130 is installed in a submerged pump body 110 differs according to an installation position of the water level detection member 130; and a submerged pump control part 140 starts operation of the submerged pump body 110 based on that the first water level is detected by the first detection part 131, measures a time from the detection of the first water level by the first detection part to the detection of the second water level by the second detection part 132, and stops operation of the submerged pump body 110 at stop timing according to the measured time.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a submersible pump. [Background technology]

[0002] Conventionally, submersible pumps have been used at construction sites for purposes such as draining spring water. Submersible pumps use a motor to draw up water and drain it, but the operation of the submersible pump starts and stops depending on the amount of water (water level) accumulated in the boiler room (water tank).

[0003] For example, Patent Documents 1 and 2 disclose techniques relating to submersible pumps equipped with an automatic operation function based on water level control.

[0004] Specifically, the submersible pump disclosed in Patent Document 1 operates the motor based on a water level determination signal from a water level detector, and stops the motor after a calculated operating time determined from past stop times and operating times.The submersible pump disclosed in Patent Document 2 uses a water level detector to detect multiple water levels, including a stop water level and an operating water level, and operates and stops the motor based on these levels.

[0005] It is also disclosed that the height of the tip can be set as desired by making the structure of the detection part that detects the water level semi-flexibly rod-shaped so that the control water level detected by the water level detector can be easily changed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-220895 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-315367 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the submersible pumps disclosed in Patent Documents 1 and 2, after the operation of the submersible pump main body has started, it may not be possible to stop the operation of the submersible pump main body at the appropriate time based on the discharge volume, remaining water volume, and the corresponding water levels, etc.

[0008] Regarding the automatic operation function of a submersible pump, there is a demand for the ability to set the timing for starting operation of the submersible pump main body to a desired water level. As disclosed in Patent Documents 1 and 2, it is possible to change the controlled water level by deforming the rod-shaped detection part of the water level detector. However, changing the controlled water level in this way poses a problem in that it becomes difficult to stop the operation of the submersible pump main body at the appropriate time after it has started operating.

[0009] Therefore, an object of the present invention is to provide an underwater pump that can start operation of the underwater pump main body at a desired water level and stop operation of the underwater pump main body at an appropriate timing. [Means for solving the problem]

[0010] An underwater pump according to one embodiment of the present invention comprises a submersible pump main body, a water level detection member installed directly or indirectly on the submersible pump main body, and a submersible pump control unit that controls the operation of the submersible pump main body, wherein the water level detection member includes a first detection unit that detects a first water level and a second detection unit that detects a second water level lower than the first water level, and wherein a first vertical distance between the first detection unit and the second detection unit when the water level detection member is installed on the submersible pump main body varies depending on the installation position of the water level detection member on the submersible pump main body, and the submersible pump control unit starts operation of the submersible pump main body based on the detection of the first water level by the first detection unit, measures the time from when the first water level is detected by the first detection unit to when the second water level is detected by the second detection unit, and stops the operation of the submersible pump main body at a stop timing that corresponds to the measured time.

[0011] In the above aspect, the water level detection member may be installed at any one of a plurality of installation positions provided at different height positions on the submersible pump body.

[0012] In the above aspect, the water level detection member may be configured to be installed at a different angle relative to the submersible pump body in each of the multiple installation positions.

[0013] In the above aspect, the water level detection member may be configured to be fixable at different angles at each of the plurality of installation positions.

[0014] In the above aspect, the water level detection member may be configured to be insertable at different angles in each of the plurality of installation positions.

[0015] In the above aspect, the higher the installation positions are, the larger the first distance may be when the water level detection member is installed at that installation position.

[0016] In the above aspect, the relationship between the first distance and the second distance between the second detection unit and a stop position at which the operation of the submersible pump body is stopped may be constant.

[0017] In the above aspect, the water level detection member includes a first electrode and a second electrode for detecting the water level, and the relationship between the first distance and the second distance between the second detection unit and the stop position at which the operation of the submersible pump body is stopped may differ between the case where the first electrode functions as the first detection unit and the second electrode functions as the second detection unit and the case where the first electrode functions as the second detection unit and the second electrode functions as the first detection unit. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide an underwater pump that can start operation of the underwater pump main body at a desired water level and stop operation of the underwater pump main body at an appropriate timing. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram showing the configuration of a submersible pump 10 according to an embodiment of the present invention. [Figure 2] 1 is a functional block diagram showing the functions of a submersible pump control unit 140 that controls the operation of a submersible pump main body 110 according to an embodiment of the present invention. [Figure 3] 1A to 1C are diagrams showing how the water level detection member 130 is installed at different height positions in the submersible pump body 110 according to one embodiment of the present invention. [Figure 4A] 10 is a specific example showing how the water level detection member 130 is installed at different angles in the submersible pump body 110 according to an embodiment of the present invention. [Figure 4B] 10A and 10B are diagrams showing a specific example of a submersible pump body 110 according to an embodiment of the present invention, in which the water level detection member 130 is installed at different angles. [Figure 5] 10 is a flowchart showing the flow of processing in a submersible pump control method M10 executed by a submersible pump 10 according to one embodiment of the present invention. [Figure 6] 10A and 10B are diagrams showing how the water level detection member 230 is installed at different height positions in the submersible pump body 110 of the submersible pump 20 according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the embodiment described below is merely a specific example for carrying out the present invention and is not intended to limit the scope of the present invention. Furthermore, to facilitate understanding of the description, the same components in each drawing will be designated by the same reference numerals wherever possible, and duplicate descriptions may be omitted.

[0021] <One embodiment> [Submersible pump configuration] Figure 1 is a schematic diagram showing the configuration of a submersible pump 10 according to one embodiment of the present invention. As shown in Figure 1, the submersible pump 10 includes a submersible pump main body 110, an attachment 120, a water level detection member 130, and a submersible pump control unit (not shown).

[0022] For example, the submersible pump 10 is installed in a boiler room (water tank). The operation and stop of the submersible pump main body 110 is controlled by a submersible pump control unit based on the water level detected by a water level detection member 130 installed on the submersible pump main body 110 via an attachment 120. In this way, the submersible pump 10 uses its automatic operation function to discharge water from the boiler room.

[0023] The submersible pump body 110 has a water intake port and a water discharge port, and is configured to rotate the impeller by driving the motor with the submersible pump control unit, thereby discharging water accumulated in the boiler compartment.

[0024] The attachment 120 is used to fix and install the water level detection member 130 to the submersible pump body 110, and is attached to the submersible pump body 110.

[0025] The water level detection member 130 includes a first detection part 131 and a second detection part 132. The first detection part 131 and the second detection part 132 are each composed of an electrode, for example, and detect the water level in the boiler room.

[0026] By installing the water level detection member 130 on the attachment 120 attached to the submersible pump main body 110, the first detection unit 131 detects that the water level in the boiler room has reached the first water level h1, and the second detection unit 132 detects that the water level in the boiler room has reached the second water level h2 (first water level h1 > second water level h2).

[0027] More specifically, the first detection unit 131 turns on when the water level in the boiler room rises and reaches the first water level h1, and then turns off when the water level drops below the first water level h1 as the submersible pump main body 110 operates.

[0028] The second detection unit 132 turns on when the water level in the boiler pit rises and reaches the second water level h2, and when the water level continues to rise and reaches the first water level h1, the first detection unit 131 turns on and the submersible pump main body 110 starts operating, and then turns off when the water level drops below the second water level h2.

[0029] Here, the first detection unit 131 turns on when the water level in the boiler room rises and reaches a first water level h1, and functions as a starting electrode for starting operation of the submersible pump main body 110. The second detection unit 132 functions as a measurement electrode for measuring the time from when the first detection unit 131 turns off as the submersible pump main body 110 operates and the water level drops, until the water level further drops and the second detection unit 132 turns off.

[0030] In other words, when the first water level h1 is detected by the first detection unit 131 (starting electrode), operation of the submersible pump main body 110 begins, and thereafter operation continues as long as the starting electrode is in contact with the water. Then, measurement of the above-mentioned time begins when the starting electrode leaves the water, and thereafter measurement of the above-mentioned time ends when the second detection unit 132 (measurement electrode) leaves the water. Note that it may also be possible to determine that the starting electrode and measurement electrode have left the water when a predetermined time (for example, 1 second) has passed since the starting electrode and measurement electrode left the water.

[0031] It is preferable that the relationship between the first vertical distance d1 between the first detection unit 131 and the second detection unit 132 when the water level detection member 130 is installed on the submersible pump main body 110 and the second distance d2 between the second detection unit 132 and the stop (target) position (stop timing water level h3) at which operation of the submersible pump main body 110 is stopped is configured to be constant.

[0032] Specifically, the water level detection member 130 is configured to be installed at one of a plurality of installation positions provided on the attachment 120 attached to the submersible pump main body 110. The water level detection member 130 is configured to be installed at a different angle relative to the submersible pump main body 110 depending on the installation position. This allows the relationship between the first distance d1 and the second distance d2 to be constant (for example, 1:1.5).

[0033] It is preferable that the stopping position be near the drainage limit, and may be determined based on, for example, the lowest operational water level (LWL) of the equipment pump and the lowest continuous operating water level (CWL) of the construction machinery pump, and further, consideration may be given to reducing the possibility of dry operation even if the submersible pump 10 is installed at an angle in the boiler yard.

[0034] [Submersible pump operation and shutdown control] 2 is a functional block diagram showing the functions of the submersible pump control unit 140 that controls the operation of the submersible pump main body 110 according to one embodiment of the present invention. As shown in FIG. 2, the submersible pump control unit 140 includes a first water level detection means 141, a second water level detection means 142, a submersible pump control means 143, and a stop timing calculation means 144.

[0035] The submersible pump control unit 140 is, for example, a processor provided in the submersible pump main body 110, and controls the driving of the motor to operate and stop the submersible pump main body 110 based on the on and off states of the first detection unit 131 and the second detection unit 132 in the water level detection member 130.

[0036] The first water level detection means 141 detects that the water level in the boiler room has reached the first water level h1 by the first detection part 131 of the water level detection member 130. For example, the first water level detection means 141 may detect that the water level in the boiler room has risen to reach the first water level h1 and that the first detection part 131 has changed from an off state to an on state (start detection), or may detect that the water level in the boiler room has fallen to reach the first water level h1 and that the first detection part 131 has changed from an on state to an off state (measurement start detection).

[0037] The second water level detection means 142 detects that the water level in the boiler room has reached the second water level h2 by the second detection part 132 of the water level detection member 130. For example, the second water level detection means 142 may detect that the water level in the boiler room has reached the second water level h2 as a result of a drop in the water level, and that the second detection part 132 has changed from an on state to an off state (detection of the end of measurement).

[0038] The submersible pump control means 143 controls the driving of the motor to operate and stop the submersible pump main body 110. For example, the submersible pump control means 143 controls the submersible pump main body 110 to start operation based on start detection by the first water level detection means 141, and controls the submersible pump main body 110 to stop operation based on the stop timing calculated by the stop timing calculation means 144.

[0039] The stop timing calculation means 144 calculates the stop timing for stopping the operation of the submersible pump main body 110 based on the detection of the start of measurement by the first water level detection means 141 and the detection of the end of measurement by the second water level detection means 142. For example, the stop timing calculation means 144 measures the time from the detection of the start of measurement to the detection of the end of measurement, and measures the time it takes for the water level in the boiler room to drop from the first water level h1 to the second water level h2 due to the operation of the submersible pump main body 110. Then, the stop timing calculation means 144 calculates the stop timing according to the measured time.

[0040] Specifically, if it takes time t1 for the water level in the boiler basin to drop from the first water level h1 to the second water level h2, the stop timing calculation means 144 may calculate time t2 from the second water level h2 to the stop position (stop timing water level h3) of the submersible pump main body 110 according to the relationship between the first distance d1 and the second distance d2. For example, if the relationship between the first distance d1 and the second distance d2 is 1:1.5, the stop timing calculation means 144 may calculate 1.5 times the measured time t1 as time t2, and calculate the stop timing as the time t2 after the second water level detection means 142 detects the end of measurement.

[0041] [Installation location of water level detection component] Next, the reason why the water level detection members 130 are installed at different height positions in the submersible pump body 110 will be described in detail.

[0042] 3 is a diagram showing how the water level detection member 130 is installed at different height positions in the submersible pump body 110 according to one embodiment of the present invention. As shown in FIG. 3, the water level detection member 130 is installed at three different height positions and at different angles relative to the submersible pump body 110.

[0043] In Figure 3(A), the water level detection member 130 is installed at a low position on the submersible pump body 110 using the attachment 120. For example, the water level detection member 130 is installed at a first angle relative to the submersible pump body 110 so that the first detection unit 131 detects a first water level h11 and the second detection unit 132 detects a second water level h12. The stopping (target) position of the submersible pump body 110 is set to water level h13 (height position h13 from the bottom of the submersible pump body 110).

[0044] In Figure 3(B), the water level detection member 130 is installed at a central position in the submersible pump main body 110 using the attachment 120. For example, the water level detection member 130 is installed at a second angle (first angle < second angle) relative to the submersible pump main body 110 so that the first detection unit 131 detects a first water level h21 (first water level h11 < first water level h21) and the second detection unit 132 detects a second water level h22 (second water level h12 < second water level h22). The stop (target) position of the submersible pump main body 110 is set to water level h23 (height position h23 from the bottom of the submersible pump main body 110).

[0045] In Figure 3(C), the water level detection member 130 is installed at a high position on the submersible pump main body 110 using the attachment 120. For example, the water level detection member 130 is installed at a third angle (second angle < third angle) relative to the submersible pump main body 110 so that the first detection unit 131 detects the first water level h31 (first water level h21 < first water level h31) and the second detection unit 132 detects the second water level h32 (second water level h22 < second water level h32). The stop (target) position of the submersible pump main body 110 is set to water level h33 (height position h33 from the bottom of the submersible pump main body 110).

[0046] In this way, when the water level detection member 130 is installed at three different height positions (low position, medium position, high position) in the submersible pump main body 110, the water level detection member 130 is installed at different angles (first angle, second angle, third angle) so that the vertical distance between the first detection unit 131 and the second detection unit 132 located at both ends of the water level detection member 130 is different.

[0047] As a result, even if the water level detection member 130 is installed at three different height positions (low position, medium position, high position) on the submersible pump main body 110, the relationship between the first vertical distances d11, d21 and d31 between the first detection unit 131 and the second detection unit 132 when installed on the submersible pump main body 110 and the second distances d12, d22 and d32 between the second detection unit 132 and the stop (target) positions h13, h23 and h33 is configured to be constant (for example, 1:1.5).

[0048] 4A is a specific example showing how the water level detection member 130 is installed at different angles in the submersible pump main body 110 according to one embodiment of the present invention. As shown in FIG. 4A, the attachment 120 has three installation positions Pa, Pb, and Pc, and the water level detection member 130 is installed at one of the three installation positions Pa, Pb, or Pc.

[0049] The attachment 120 is attached vertically to the side of the submersible pump body 110, and the water level detection member 130 is fixed and installed by being inserted into one of the installation positions: low position installation position Pa, medium position installation position Pb, and high position installation position Pc.

[0050] At the installation position Pa, the water level detection member 130 is inserted into the attachment 120 at a first angle θ1 and fixed at the first angle θ1. This results in a first vertical distance d11 between the first detection unit 131 and the second detection unit 132 when installed on the submersible pump body 110.

[0051] At the installation position Pb, the water level detection member 130 is inserted into the attachment 120 at a second angle θ2 (first angle θ1 < second angle θ2) and fixed at the second angle θ2. This results in a first vertical distance d21 (first distance d11 < first distance d21) between the first detection unit 131 and the second detection unit 132 when installed on the submersible pump body 110.

[0052] At the installation position Pc, the water level detection member 130 is inserted into the attachment 120 at a third angle θ3 (second angle θ2 < third angle θ3) and fixed at the third angle θ3. This results in a first vertical distance d31 (first distance d21 < first distance d31) between the first detection unit 131 and the second detection unit 132 when installed on the submersible pump body 110.

[0053] 4B is a specific example showing the water level detection member 130 installed at different angles in the submersible pump body 110 according to one embodiment of the present invention. As shown in FIG. 4B, the water level detection member 130 is fixed and installed at different angles at installation positions Pa, Pb, and Pc.

[0054] [Submersible pump control method] Next, a method for controlling the operation of the submersible pump main body 110 in the submersible pump 10 will be specifically described in detail.

[0055] 5 is a flowchart showing the process flow of a submersible pump control method M10 executed by a submersible pump 10 according to one embodiment of the present invention. As shown in FIG. 5, the submersible pump control method M10 includes steps S110 to S180, and each step is executed by a processor included in the submersible pump control unit 140.

[0056] In step S110, the first water level detection means 141 monitors whether the first detection unit 131, which detects the first water level, changes from an off state to an on state, and detects (start-up detection) that the first detection unit 131 has changed from an off state to an on state ("Yes" in step S110), and proceeds to processing in step S120.

[0057] In step S120, the submersible pump control means 143 starts the operation of the submersible pump main body 110 based on the start detection by the first water level detection means 141.

[0058] In step S130, the first water level detection means 141 monitors whether the first detection unit 131, which detects the first water level, changes from an on state to an off state, and detects that the first detection unit 131 has changed from an on state to an off state (detects the start of measurement) (“Yes” in step S130), and proceeds to processing in step S140.

[0059] In step S140, the stop timing calculation means 144 starts measurement for calculating the stop timing based on the detection of the start of measurement by the first water level detection means 141. Specifically, the stop timing calculation means 144 may store the time of the detection of the start of measurement.

[0060] Note that, considering that operation of the submersible pump main body 110 is started based on start detection and the water level in the boiler room drops immediately thereafter, measurement start detection may be detected immediately based on start detection, for example. That is, the time of start detection may be stored as the time of measurement start detection, or a predetermined time after the time of start detection (for example, the time when drainage actually begins due to operation of the submersible pump main body 110) may be stored as the time of measurement start detection.

[0061] In step S150, the second water level detection means 142 monitors whether the second detection unit 132 that detects the second water level changes from an ON state to an OFF state, and when it detects that the second detection unit 132 has changed from an ON state to an OFF state (detection of measurement end) (“Yes” in step S150), it proceeds to the processing of step S160. Note that if the water level rises and it is detected that the first detection unit 131 has changed from an OFF state to an ON state before it is detected that the second detection unit 132 has changed from an ON state to an OFF state (detection of measurement end), it may reset the measurement, and may start measurement again by detecting that the first detection unit 131 has changed from an ON state to an OFF state (detection of measurement start).

[0062] In step S160, the stop timing calculation means 144 calculates the stop timing based on the detection of the end of measurement by the second water level detection means 142. Specifically, the stop timing calculation means 144 calculates the time required for the water level in the boiler bay to drop from the first water level to the second water level based on the time of the detection of the start of measurement stored in step S140 and the time of the detection of the end of measurement in step S150.

[0063] Then, the stop timing calculation means 144 calculates the stop timing according to the calculated time. For example, the stop timing calculation means 144 calculates the stop timing as the time 1.5 times the calculated time from the time when the measurement end is detected in step S160.

[0064] In step S170, the submersible pump control means 143 monitors whether the stop timing calculated in step S160 has arrived, and if the stop timing has arrived ("Yes" in step S160), the process proceeds to step S170.

[0065] In step S180, the submersible pump control means 143 stops the operation of the submersible pump main body 110.

[0066] As described above, according to the submersible pump 10 and submersible pump control method M10 of one embodiment of the present invention, the water level detection member 130 is fixed and installed at different angles (first angle θ1, second angle θ2, third angle θ3) regardless of which of the three different height positions (low position Pa, middle position Pb, high position Pc) on the submersible pump main body 110 it is installed at. Furthermore, the relationship between the first distances d11, d21, and d31 and the second distances d12, d22, and d32 when the water level detection member 130 is installed on the submersible pump main body 110 is constant. As a result, regardless of which of the three different height positions (low position Pa, middle position Pb, high position Pc) on the submersible pump main body 110 the submersible pump control unit 140 can stop operation of the submersible pump main body 110 at a stop timing that corresponds to the time from when measurement start is detected to when measurement end is detected.

[0067] As a result, the user can install the water level detection member 130 at one of three different height positions (low position Pa, middle position Pb, high position Pc) on the submersible pump main body 110, start operation of the submersible pump main body 110 at the desired water level, and stop operation of the submersible pump main body 110 at the appropriate timing. In other words, by reducing the occurrence of the submersible pump main body 110 being stopped when there is a large amount of residual water in the boiler yard and reducing the possibility of drought operation, energy conservation can be improved and appropriate automatic operation can be achieved.

[0068] [Variations] In this embodiment, the water level detection member 130 is configured to be inserted into an installation position on the attachment 120 attached to the submersible pump body 110, but this is not limited to this. For example, guides may be provided on the surface of the installation positions Pa, Pb, and Pc of the attachment 120 to enable the water level detection member 130 to be installed at the first angle θ1, the second angle θ2, and the third angle θ3, respectively. Furthermore, a fitting mechanism may be provided to fix the water level detection member 130 on the surface of the attachment 120.

[0069] Further, for example, the attachment and water level detection member may be an attachment using a pivot mechanism. Figure 6 is a diagram showing how the water level detection member 230 is installed at different height positions in the submersible pump body 110 of a submersible pump 20 according to another embodiment of the present invention. As shown in Figure 6, the water level detection member 230 is installed at three different height positions and at different angles relative to the submersible pump body 110.

[0070] The water level detection member 230 has a first detection part 231 and a second detection part 232 at different positions on the front and back sides (the left and right sides of the arm shown in Figure 6 (A)), and is configured to be rotatable by an attachment 220 attached to the underwater pump main body 110.

[0071] In Figure 6(A), the water level detection member 230 is configured, as in Figure 3(A), so that the arm is fixed at a position where the first detection part 231 detects the first water level h11 and the second detection part 232 detects the second water level h12.

[0072] In Figure 6(B), the water level detection member 230 is configured, as in Figure 3(B), so that the arm is fixed at a position where the first detection part 231 detects the first water level h21 and the second detection part 232 detects the second water level h22.

[0073] 6(C), the arms of the water level detection member 230 are rotated to reverse the vertical positions of the first detection portion 231 and the second detection portion 232. In this case, the second detection portion 232 detects the first water level h41, and the first detection portion 231 detects the second water level h42.

[0074] Specifically, the first water level detection means 141 detects (start detection) that the second detection unit 232, which detects the first water level h41, has changed from an off state to an on state, and the submersible pump control means 143 starts operation of the submersible pump main body 110.

[0075] The first water level detection means 141 detects that the second detection unit 232 has changed from an on state to an off state (detection of the start of measurement), and the stop timing calculation means 144 starts measurement to calculate the stop timing.

[0076] The second water level detection means 142 detects that the first detection unit 231, which detects the second water level h42, has changed from an ON state to an OFF state (detection of the end of measurement), and the stop timing calculation means 144 calculates the stop timing. Specifically, the stop timing calculation means 144 calculates the water level drop time over the second distance d42 between the first detection unit 231 and the stop (target) position h43, which corresponds to the water level drop time over the first distance d41 in the vertical direction between the second detection unit 232 and the first detection unit 231 when the water level detection member 230 is installed in the submersible pump body 110, and calculates the stop timing.

[0077] In this way, in Figures 6(A) and 6(B), similar to Figures 3(A) and 3(B), the relationship between the first distances d11 and d21 and the second distances d12 and d22 is configured to be constant, so the stop timing calculation means 144 only needs to calculate the stop timing in accordance with this relationship.

[0078] On the other hand, in Figure 6(C), the relationship between the first distance d41 and the second distance d42 is different from that in Figures 6(A) and 6(B), so the stop timing calculation means 144 can calculate the stop timing in accordance with this relationship (for example, 1:6) based on the fact that the vertical positions of the first detection unit 231 and the second detection unit 232 are reversed.

[0079] In this embodiment, the water level detection member 130 is fixed and installed at three different heights and at different angles in the submersible pump body 110, but this is not limited to this. For example, the water level detection member may be provided with an extension mechanism that can change the distance between the first and second detection units located at both ends of the water level detection member. Even if the water level detection member is installed at three different heights in the submersible pump body 110 at the same angle, the extension mechanism can be used to change the distance between the first and second detection units depending on the height position.

[0080] Furthermore, in this embodiment, the water level detection member 130 is configured to be installed at three different height positions in the submersible pump main body 110, but the number of installation positions is not limited to three, and may be two, four or more.

[0081] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The elements of the embodiments, as well as their arrangement, materials, conditions, shapes, sizes, etc., are not limited to those illustrated and can be modified as appropriate. Furthermore, configurations shown in different embodiments can be partially substituted or combined with each other. [Explanation of symbols]

[0082] 10, 20... Submersible pump, 110... Submersible pump main body, 120, 220... Attachment, 130, 230... Water level detection member, 131, 231... First detection unit, 132, 232... Second detection unit, 140... Submersible pump control unit, 141... First water level detection means, 142... Second water level detection means, 143... Submersible pump control means, 144... Stop timing calculation means, M10... Submersible pump control method, S110 to S180... Each step of the submersible pump control method M10, Pa, Pb, Pc... Installation position

Claims

1. A submersible pump body, A water level detection member installed directly or indirectly on the submersible pump body; an underwater pump control unit that controls the operation of the underwater pump body; The water level detection member is a first detection unit that detects a first water level; a second detection unit that detects a second water level that is lower than the first water level, A first vertical distance between the first detection unit and the second detection unit when the water level detection member is installed in the submersible pump body is configured to vary depending on the installation position of the water level detection member in the submersible pump body, The submersible pump control unit The operation of the submersible pump body is started based on the detection of the first water level by the first detection unit, measuring the time from when the first water level is detected by the first detection unit to when the second water level is detected by the second detection unit; Stopping the operation of the submersible pump body at a stop timing corresponding to the measured time. Submersible pump.

2. The water level detection member is installed at one of a plurality of installation positions provided at different height positions in the submersible pump body, 2. The submersible pump of claim 1.

3. In each of the plurality of installation positions, the water level detection member is configured to be installed at a different angle relative to the submersible pump body.

3. The submersible pump of claim 2.

4. The water level detection member is configured to be fixable at different angles in each of the plurality of installation positions.

4. The submersible pump according to claim 3.

5. The water level detection member is configured to be insertable at different angles in each of the plurality of installation positions.

5. The submersible pump of claim 4.

6. As the installation positions become higher, the first distance becomes larger when the water level detection member is installed at the installation position.

3. The submersible pump of claim 2.

7. The relationship between the first distance and a second distance between the second detection unit and a stop position at which the operation of the submersible pump body is stopped is constant.

2. The submersible pump of claim 1.

8. the water level detection member includes a first electrode and a second electrode for detecting the water level; The relationship between the first distance and the second distance between the second detection unit and a stop position at which the operation of the submersible pump body is stopped is different between a case where the first electrode functions as the first detection unit and the second electrode functions as the second detection unit and a case where the first electrode functions as the second detection unit and the second electrode functions as the first detection unit.

2. The submersible pump of claim 1.

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