JP2006022668A - Submersible pump and submersible pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a submersible pump device capable of substantially automatic alternating operation with one kind of submersible pump.
SOLUTION: Two submersible pumps 1 are installed in a storage tank 21 in a submersible pump device 20. The water level sensor of each submersible pump 1 includes a single capacitance sensor 10. The control circuit in each submersible pump 1 includes a plurality of types of timer circuits that have different activation set times for activating the submersible pump 1 when the electrostatic capacity sensor 10 continuously detects the water level for a predetermined time. The activation setting time is alternately selected from a plurality of types of timer circuits, and is activated by detecting the water level by the capacitance sensor 10, and is controlled to stop after the elapse of a predetermined time by the water level sensor 1 not detecting the water level. Yes.
[Selection] Figure 3

Description

  The present invention relates to a submersible pump that is installed in a storage tank such as a combined septic tank and drains water in the tank, and a submersible pump device using the submersible pump.

  Conventionally, two submersible pumps for draining accumulated water such as sewage are installed in a storage tank such as a combined septic tank, and even if one submersible pump fails, the remaining submersible pumps The structure was designed so that the water in the storage tank would not overflow due to operation.

  In order to prevent only one submersible pump from operating for a long period of time and the other submersible pump to be in a stopped state and causing a rusting of the stopped submersible pump, The structure includes two sets of float switches for starting and stopping, and the second submersible pump includes three sets of float switches for starting, stopping, and simultaneous operation of two units. The two submersible pumps were controlled to operate alternately (see, for example, Patent Documents 1 to 3).

JP-A-6-241191 Japanese Utility Model Publication No. 1-176772 Japanese Utility Model Publication No. 58-152580

  However, according to the method of automatically operating two submersible pumps with the above-described conventional structure, there are two submersible pumps including a submersible pump provided with two sets of float switches and a submersible pump provided with three sets of float switches. A kind of submersible pump was required, and two kinds of submersible pumps had to be prepared.

  Therefore, there is a drawback that the manufacturing cost increases and the inventory space also increases.

  In view of these problems, an object of the present invention is to provide a submersible pump and a submersible pump apparatus using the submersible pump that can perform substantially automatic alternate operation with one type of submersible pump.

  The technical means of the submersible pump for solving the above problems is a submersible pump comprising a control circuit that is automatically started and stopped in accordance with the increase or decrease of the water level detected by a water level sensor provided in the pump body. The water level sensor is a single unit, and the control circuit includes a plurality of types of timer circuits having different activation set times for activating the submersible pump when the water level is continuously detected by the water level sensor for a predetermined time. The start setting time is selected from the plurality of types of timer circuits, the control is started by detecting the water level by the water level sensor, and stopped after a predetermined time has elapsed due to the non-detection of the water level by the water level sensor. is there.

  Moreover, it is good also as a structure where the external sensor part of the said water level sensor is provided in the exterior of the said pump main body so that height adjustment is possible.

  Further, the water level sensor is a capacitance sensor that detects a water level by a change in dielectric constant, one electrode of the capacitance sensor is a metal part of the submersible pump, and the other electrode is outside the submersible pump. It is good also as a structure taken out and arrange | positioned.

  Moreover, the technical means of the submersible pump apparatus for solving the said subject exists in the point by which multiple said submersible pumps were installed in the storage tank.

  Furthermore, the number of submersible pumps installed is two, and the start-up setting time for each submersible pump is two types: a short start-up set time that starts with a short detection time and a long start set time that starts with a long detection time. And the short activation set time and the long activation set time are controlled to be alternately selected.

  As described above, according to the submersible pump of the present invention, the water level sensor is a single unit, and when the water level is continuously detected by the water level sensor for a predetermined time, the control circuit has a startup setting time for starting the submersible pump. Provided with different types of timer circuits, start time is selected from multiple types of timer circuits, starts when water level is detected by water level sensor, and stops after elapse of a predetermined time when water level is not detected by water level sensor Because it is controlled, if the water level sensor detects the predetermined water level continuously for a predetermined time according to the selected startup setting time, the submersible pump will start and the water level will drop due to drainage by the operation of the submersible pump. If the predetermined water level is not detected, it stops after a predetermined time has elapsed.

  Accordingly, it is possible to perform different control of the operation start time from when the water level sensor detects the water level until the submersible pump is activated, according to the activation setting time selected from the plurality of types of timer circuits.

  Further, if the external sensor part of the water level sensor is provided outside the pump body so that the height can be adjusted, the water level detected by the water level sensor can be adjusted by adjusting the height position of the external sensor part. Can be adjusted easily.

  Further, the water level sensor is a capacitance sensor that detects a water level by a change in dielectric constant, one electrode of the capacitance sensor is a metal part of the submersible pump, and the other electrode is outside the submersible pump. If the structure is taken out and arranged, it can be configured more compactly than a submersible pump having a structure with a float switch as in the prior art, and there is an advantage that the submersible pump can be downsized.

  Further, according to the submersible pump device of the present invention, a plurality of the submersible pumps are installed in the storage tank, and water such as sewage flows into the water tank and the water level rises. If the water level sensor of the submersible pump continues to detect the predetermined water level, the selected submersible pump with the short start-up setting time starts and drainage starts, and the submersible pump with the long start-up set time starts. If the water level drops before starting, the submersible pump that has a long startup setting time will not start.

  Similarly, when the water level flows into the water tank next time, the water level rises, and the state where the predetermined water level is detected by the water level sensor of each submersible pump continues, If the short submersible pump is activated and drainage is started and the water level drops before the selected submersible pump with a long activation setting time is activated, the submersible pump with a long activation setting time is not activated.

  At this time, the control circuit of each submersible pump is provided with a plurality of types of timer circuits having different start setting times, and the start set time is selected from the plurality of types of timer circuits. The start-up set time selected changes accordingly, and the submersible pump with the short start-up set time selected is automatically changed. In addition, it is possible to effectively prevent the situation where the other submersible pumps are stopped.

  In addition, since it is only necessary to install multiple submersible pumps of the same type, it is not necessary to manufacture different types of submersible pumps, which is suitable for mass production and can reduce manufacturing costs, and it is necessary to prepare multiple types of submersible pumps. Therefore, there is an advantage that the inventory space can be reduced and the economy is excellent.

  Furthermore, if the external sensor part of the water level sensor in the submersible pump is provided outside the pump body so that the height can be adjusted, the height of the external sensor part of the water level sensor in each submersible pump can be adjusted to be different from each other. Thus, simultaneous activation of each submersible pump can be effectively prevented.

  The water level sensor is a capacitance sensor that detects the water level by a change in dielectric constant, and one electrode of the capacitance sensor is a metal part of the submersible pump, and the other electrode is taken out from the submersible pump. If it is the structure currently used, it can comprise more compactly compared with the conventional float switch. Moreover, the conventional float switch type submersible pump has a structure in which the float switch swings up and down to detect the water level, so that the float switch does not interfere with the other submersible pump and cause malfunction. It was necessary to install the submersible pump separately, which caused an increase in the size of the storage tank. However, according to the detection method using the capacitance sensor, the water level is detected by the difference in dielectric constant between air and liquid in the storage tank. There is an advantage that it is not necessary to install each submersible pump separately, and the storage tank can be downsized.

  Furthermore, the number of installed submersible pumps is two, and the start-up setting times for each submersible pump are two types of the short-start set-up time activated by a short detection time and the long-start set-up time activated by a long detection time. A structure including a timer circuit and controlled so that the short start set time and the long start set time are alternately selected has the advantage that substantially automatic alternating operation can be effectively achieved with one type of submersible pump. .

  At this time, if the external sensor part of the water level sensor is provided with a height adjustable, automatic alternating operation can be more reliably performed by appropriately changing the height of the external sensor parts. it can.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a pump body 1 a in a submersible pump 1 includes a metal motor casing 3 that houses a motor unit 2, and the motor casing 3. A motor cover 5 made of resin or the like, which covers the circuit board 4 and other electrical components, which are detachably mounted on the upper casing portion 3a, and an impeller and accommodates the pumping liquid flow A pump casing 6 made of resin or the like that forms a path, and an oil chamber housing 7 disposed between the motor casing 3 and the pump casing 6 are provided.

  The drive shaft 2a of the motor portion 2 is supported by the bottom portion of the motor casing 3 and the upper casing portion 3a via a bearing 8 so as to be rotatable about a vertical axis, and the lower portion of the drive shaft 2a is an oil chamber housing. 7 is arranged so as to penetrate in the vertical direction, and an impeller is attached to the lower end portion thereof.

  The oil chamber constituted by the oil chamber housing 7 contains lubricating oil, and a mechanical seal is provided to seal between the drive shaft 2a and the oil chamber housing 7 in a portion through which the drive shaft 2a passes. It is installed.

  A transformer, a relay, and the like are appropriately mounted on the circuit board 4, and a predetermined control circuit is configured by a desired timer circuit or the like.

  Further, the pump body 1 a is provided with a capacitance sensor 10 as a water level sensor for detecting the water level, and one electrode 10 a in the capacitance sensor 10 is a metal part in the motor cover 5. The motor casing 3 is connected to the upper casing portion 3 a to constitute one electrode 10 b, and the other electrode 10 c in the capacitance sensor 10 is taken out and arranged outside the motor cover 5.

  And since the relative dielectric constant of air is about 1 and the relative dielectric constant of water is about 50, the dielectric constant between the motor casing 3 as one electrode 10b and the other electrode 10c is measured. From the difference, control is performed to identify whether the position of the electrode 10c is immersed in water or exposed to the air.

  Further, the control circuit provided on the circuit board 4 activates the submersible pump 1 when the capacitance sensor 10 continuously detects the water level where the electrode 10c is immersed in water for a predetermined time. In addition to having two types of timer circuits with different start-up setting times, the electrode 10c is exposed to the air after the submersible pump 1 is started, and if the water level is not detected, it stops after a predetermined time has elapsed. Is controlled to do. For example, a delay circuit may be employed as such a timer circuit.

  For example, as two types of start setting times for the timer circuit for starting the submersible pump 1, the start is performed with a long detection time of a short start setting time t1 = 3 seconds for detecting the water level by the capacitance sensor 10 with a short detection time. The long start set time t2 = 10 seconds to be set is set, and when the water level is not detected, it is set to stop after a predetermined stop set time t3 = 15 seconds.

  Next, an operation based on a control program that is automatically started / stopped according to the increase / decrease of the water level in the submersible pump 1 will be described with reference to the flowchart of FIG.

  That is, n = 0 is set as an initial value for the submersible pump 1 (step 1), and then the process proceeds to step 2 where n = n + 1.

  Next, the process proceeds to step 3 where it is determined whether n is an odd number. If n is an odd number, t1 is set as a start setting time Tn as a water level detection continuation time which is a condition for starting the submersible pump 1. = 3 seconds is set (step 4). If n is not an odd number but an even number, t2 = 10 seconds is set as the activation setting time Tn (step 5).

  Thereafter, the process proceeds to step 6, and it is determined whether or not the electrostatic capacity sensor 10 has detected the water level at which the submersible pump 1 needs to be activated, that is, the activated water level. If the activation water level is detected by the electrostatic capacity sensor 10, it is determined whether or not the detection state has continued for a predetermined time, that is, the activation setting time Tn (step 7).

  If the detection state does not continue for the activation set time Tn, the process proceeds to step 8 where it is determined whether the activation water level of the submersible pump 1 is detected by the capacitance sensor 10 and the activation water level is detected. If so, return to Step 7. If the starting water level of the submersible pump 1 is not detected in step 8, the process proceeds to step 9 to determine whether n is an odd number. If it is odd, the process returns to step 3; Returned to 2.

  In step 7, if the detection state continues for the activation set time Tn, the submersible pump 1 is activated (step 10), and the drainage operation is started. Thereafter, the process proceeds to step 11 where it is determined whether or not the startup water level has been detected by the capacitance sensor 10. If the startup water level is detected, the operation of the submersible pump 1 is continued.

  Then, if the startup water level is not detected, it is determined whether or not a predetermined stop set time t3 = 15 seconds has passed. If the stop set time t3 = 15 seconds has passed, the operation of the submersible pump 1 is stopped, Return to step 2.

  Therefore, according to this submersible pump 1, when the electrode 10c portion of the capacitance sensor 10 is immersed in water due to the inflow of water into the water storage tank, the first start-up time t1 = 3 seconds is immersed in water. The operation is started when the detected state is detected. Then, when the water level drops due to the drainage of the submersible pump 1 and there is no water in the electrode 10c portion, the submersible pump 1 is controlled to stop after continuously operating for a set stop time t3 = 15 seconds. .

  Thereafter, when the water level in the storage tank rises due to the inflow of water due to the passage of time and the electrode 10c portion is submerged in water, this time, detection is performed by detecting the state of submersion in water for a long startup set time t2 = 10 seconds. Is started. Then, when the water level drops due to the drainage of the submersible pump 1 and there is no water in the electrode 10c portion, the submersible pump 1 is controlled to stop after continuously operating for a set stop time t3 = 15 seconds. .

  Next, when the electrode 10c portion is immersed in water, the operation is started after 3 seconds as in the first time, and when the water level is lowered, the operation is stopped after 15 seconds.

  In this way, the state of operation after 3 seconds, which is the short activation setting time, and the state of operation after 10 seconds, which is the long activation setting time, are alternately repeated by detecting the water level by the capacitance sensor 10. So that it is controlled.

  Next, as shown in FIG. 3, the submersible pump device 20 according to the first embodiment such as a combined septic tank using the submersible pump 1 will be described.

  That is, in this embodiment, it is set as the structure where the two submersible pumps 1 were installed in the storage tank 21 in the submersible pump apparatus 20. FIG. In this case, the height of the electrode 10c portion of the capacitance sensor 10 in both submersible pumps 1 is substantially the same.

  Then, the water level rises with the inflow of water into the storage tank 21, and the electrode 10c is in a state of being immersed in water. At the time of the inflow of water, the undulation of water is generated due to the momentum of the inflowing water, and one of the electrodes 10c is in contact with the water and is submerged, and after the lapse of t1 = 3 seconds, which is the short start-up setting time, The pump 1 starts and starts operation. Under the present circumstances, let the submersible pump 1 which starts an operation | movement ahead be a 1st pump, and let the other submersible pump 1 be a 2nd pump.

  When the operation of the first pump is started and drainage is performed, the water level in the storage tank 21 is rapidly lowered. Therefore, the capacitance sensor 10 of the second pump has the detection time of the water level set to the startup set time Tn. Since the short start setting time t1 = 3 seconds is not reached, the operation is not started.

  After the drainage by the first pump, when the water level reaches the electrode 10c portion again due to the inflow of water, the first pump is operated after t2 = 10 seconds when the startup setting time Tn is the long startup setting time. Since the pump is operated after t1 = 3 seconds when the activation setting time Tn is a short activation setting time, the first pump is not started and the second pump is started first. And it drains with a 2nd pump.

  At this time, the first pump does not start operation, but returns to Step 2 after Steps 7 to 8 and Step 9 in the flowchart in FIG. 2, and the activation setting time Tn is a short activation setting time t1 = 3. Changed to seconds. Further, the start setting time Tn is changed to the long start setting time t2 = 10 seconds by the operation of the second pump.

  Then, after draining by the second pump, if the water flows again and the water level reaches the electrode 10c portion, the first pump starts operation after 3 seconds, and the second pump is set to start without starting operation. The time Tn is changed to t1 = 3 seconds, which is a short activation setting time.

  By repeating the above operation, both submersible pumps 1 in the submersible pump device 20 are automatically operated alternately.

  In addition, there is an inflow of water into the storage tank 21 during the operation of one submersible pump 1, and the detection time of the activation water level by the capacitance sensor 10 of the other submersible pump 1 is a long activation setting time t2 = 10 seconds When the above has elapsed, the other submersible pump 1 is also started to operate, and two units are operated simultaneously, and the water in the storage tank 21 is quickly drained.

  When the start setting times Tn of the two submersible pumps 1 are the same, there is no problem even if the two submersible pumps 1 are operated at the same time. It only has to be done.

  According to the submersible pump device 20 of the present embodiment, the submersible pumps 1 can be operated substantially automatically by simply installing two submersible pumps 1 of the same type. Instead, it is possible to effectively prevent a situation in which only the same submersible pump 1 operates for a long period of time and the other submersible pumps 1 are stopped, and it is not necessary to manufacture different types of submersible pumps 1 for mass production. The manufacturing cost can be reduced appropriately, and it is not necessary to prepare a plurality of types of submersible pumps 1 in advance. In addition, the capacitance sensor 10 in the submersible pump 1 may be a single unit, and this also has an advantage that cost reduction can be achieved.

  Further, a capacitance sensor 10 is used as a sensor for detecting the water level, and one electrode 10b in the capacitance sensor 10 is a motor casing 3 which is a metal part of the submersible pump 1, and the other electrode. 10c is a structure which is taken out and arranged outside the submersible pump 1, and can be configured more compactly than a conventional float switch. Moreover, the conventional float switch type submersible pump has a structure in which the float switch swings up and down to detect the water level, so that the float switch does not interfere with the other submersible pump and cause malfunction. Although it was necessary to install the submersible pump separately, the size of the storage tank was increased, but according to the detection method using the capacitance sensor 10, the dielectric constant between the air and water (liquid) in the water storage tank 21 is increased. It is a structure that detects the water level due to the difference, and there is no need to install each submersible pump 1 separately, and there is an advantage that the storage tank 21 can be downsized.

  FIG. 4 shows a second embodiment, in which an electrode 10c as an external sensor portion in the electrostatic capacity sensor 10 provided in the submersible pump 1 is provided upright outside the pump body 1a. 23 has a structure that can be adjusted in height. Others are the same as those in the first embodiment.

  Accordingly, when the both submersible pumps 1 are installed in the storage tank 21, if the heights of the electrodes 10c of the capacitance sensor 10 are appropriately different from each other, even if the start setting time Tn is the same, the electrodes Since the submersible pump 1 arranged on the lower side of 10c is activated first, simultaneous activation can be effectively prevented, and the subsequent activation setting times Tn are different from each other, so that the automatic alternating operation can be more reliably performed. it can.

  In each of the above-described embodiments, two types of timer circuits, that is, the short activation setting time t1 = 3 seconds and the long activation setting time t2 = 10 seconds as the activation setting time Tn by detecting the activation water level of the capacitance sensor 10, and Although a structure including a timer circuit with a stop set time t3 = 15 seconds due to the non-detection of the start water level is shown, the short start set time t1 and the long start set time t2 of the start set time Tn are limited to 3 seconds or 10 seconds. In addition, the stop set time t3 that is the operation time after non-detection is not limited to 15 seconds, but may be other seconds, and may be set as appropriate according to the size of the storage tank 21.

  Further, the timer circuit at such times t1, t2, and t3 may be configured to be changeable and may be appropriately set according to the application.

  Furthermore, in each said embodiment, although the structure using the electrostatic capacitance sensor 10 is shown as a water level sensor, it is not limited to the electrostatic capacitance sensor 10 at all, and the difference in insulation resistance between water and air A water level sensor for detection may be used, and a conventional float switch or the like may be disposed as an external sensor unit to perform the same control as described above.

  In addition, the structure including two different types of timer circuits in which the activation setting time Tn is a short activation setting time t1 and a long activation setting time t2 is shown, but a structure including three or more different types of timer circuits is also possible. Moreover, the short start setting time t1 and the long start setting time t2 of the start setting time Tn are alternately repeated. However, the control may be changed every second time or every third time. The change frequency of which one is selected may be set as appropriate, and is not limited to the control program of the above embodiment.

  Furthermore, although the structure which installed the two submersible pumps 1 in the storage tank 21 of the submersible pump apparatus 20 is shown, the structure of installing three or more units may be sufficient and the installation of only one unit may be sufficient. .

It is a partial cross section side view of the submersible pump concerning the embodiment of the present invention. It is a flowchart which shows the control action of a submersible pump. It is side surface explanatory drawing of the submersible pump apparatus concerning 1st Embodiment. It is side surface explanatory drawing of the submersible pump apparatus concerning 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Submersible pump 1a Pump main body 2 Motor part 3 Motor casing 4 Circuit board 5 Motor cover 10 Capacitance sensor 10b Electrode 10c Electrode 20 Submersible pump device 21 Storage tank

Claims (5)

In a submersible pump having a control circuit that is automatically started and stopped according to the increase or decrease of the water level detected by the water level sensor provided in the pump body,
The water level sensor is a single unit,
The control circuit includes a plurality of types of timer circuits having different start setting times for starting the submersible pump when the water level is continuously detected by the water level sensor for a predetermined time,
A start setting time is selected from the plurality of types of timer circuits, the start is performed by detecting the water level by the water level sensor, and the control is performed to stop after the elapse of a predetermined time due to the non-detection of the water level by the water level sensor. Submersible pump. The submersible pump according to claim 1,
The submersible pump characterized in that an external sensor portion of the water level sensor is provided outside the pump body so as to be adjustable in height. In the submersible pump according to claim 1 or 2,
The water level sensor is a capacitance sensor that detects a water level by a change in dielectric constant, and one electrode of the capacitance sensor is a metal part of the submersible pump, and the other electrode is taken out from the submersible pump. Submersible pump characterized by being. In the submersible pump device using the submersible pump according to any one of claims 1 to 3,
A submersible pump device comprising a plurality of submersible pumps installed in a storage tank. The submersible pump device according to claim 4,
The number of installed submersible pumps is two, and the start-up setting time for each submersible pump includes two types of the start-up set time that starts with a short detection time and the long start-up set time that starts with a long detection time. A submersible pump device comprising a timer circuit and controlled to alternately select a short activation set time and a long activation set time.

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