JP2007162659A - Drain pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniform the operating times of first and second drain pumps by a simple circuit and at low cost. <P>SOLUTION: In an automatic mode, connection switches 106a, 206a, 302 are closed. Each time a series of drain operations by one or both of the first and second drain pumps are completed, a ratchet relay 112 is alternately brought into a first state (switches 113, 214 are closed, and switches 213, 114 are open) and a second state (switches 213, 114 are closed, and switches 113, 214 are open). In the first stage, a switch 115 is closed at a first water level, and the first drain pump is driven by a motor 17A so that it is brought into the operating state prior to the second drain pump. In the second state, a switch 215 is closed at the first water level, and the second drain pump is driven by a motor 17B so that it is brought into an operating state prior to the first drain pump. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drainage pump device used for draining water in a pit of a hydroelectric power plant, for example.

  Specifically, the present invention automatically switches the leading and trailing of the first and second drainage pumps every time the drainage operation is completed by using a mechanical switch means, so that the circuit is simple and inexpensive. Further, the present invention relates to a drainage pump device that is adapted to make the operation time of the first and second drainage pumps uniform.

  Hydropower plants have a pit that collects water leakage at the bottom of the power plant. Conventionally, the water in this pit is drained using two drain pumps. That is, normally, the preceding drainage pump is started and stopped at a certain range of pit water levels, but when the pit water level rises further due to a failure of the preceding pump, the subsequent drainage pump is activated.

  Normally, only the preceding drainage pump is operated, and the operation time of the subsequent drainage pump is significantly different, or one of the drainage pumps breaks down and the parts are consumed. Further, in a drainage pump that has been stopped for a long period of time, water stays in the pump casing for a long period of time, causing adverse effects such as corrosion. Therefore, it is necessary to periodically switch the leading and trailing of the two drainage pumps.

  Therefore, for example, at the time of inspection inspection every month, the leading and trailing are manually switched. However, when switching every month, it is difficult to equalize the operation time of the two drainage pumps, and it is easy to cause an operation error when switching.

  In Patent Document 1, the mode is switched for each stop pulse signal from the circuit that generates the start / stop signal, and the device having the longest operation time in the previous mode is stopped as the last position in the new mode. And an alternate operation method for automatically equalizing the operation time of a plurality of devices is described.

Japanese Patent Laid-Open No. 5-113801

  In the alternating operation method described in Patent Document 1, for example, when two devices are present, the two devices are alternately operated. However, in the technique described in Patent Document 1, the mode is switched by software, and there is a problem that the circuit configuration is complicated and expensive.

  An object of the present invention is to equalize the operation time of the first and second drainage pumps with a simple circuit and at low cost.

  The drainage pump device according to the present invention includes a first drainage pump, a second drainage pump, water level detection means for detecting the water level, and when the first water level is detected by the water level detection means, Of the drainage pump and the second drainage pump, the second connection level that is higher than the first level is detected by the first connection switch that becomes conductive so that the operation of the preceding drainage pump is started and the water level detection means. The second connection switch that is in a conductive state so that the operation of the subsequent drain pump among the first drain pump and the second drain pump is started, and the first drain pump and the second drain pump. The connection positions of the first connection switch and the second connection switch so that the preceding and following of the first drain pump and the second drain pump are switched each time a series of drain operations by either or both of the pumps is completed. Cut Those comprising a mechanical switching means which obtain.

  In the present invention, when the first water level is detected by the water level detecting means, the first connection switch is turned on, and the operation of the preceding drainage pump is started. After that, when the second water level is detected by the water level detection means, the second connection switch is turned on, and the operation of the subsequent drain pump is started. Thus, when the drainage operation by the preceding drainage pump or the drainage operation by the preceding and succeeding drainage pumps becomes, for example, below a predetermined water level, the first and second connection switches are made non-conductive and the drainage pump The operation is stopped and a series of draining operations are completed. The switching of the connection positions of the first and second connection switches is mechanical so that the preceding and following of the first drain pump and the second drain pump are switched each time a series of drain operations by the drain pump is completed. Switch means, for example, a ratchet relay.

  Switching between the first and second drain pumps is performed every time a series of drain operations is completed, and the operation time of the first and second drain pumps is made uniform. . In addition, the first and second drain pumps can be switched between leading and trailing by mechanical switch means, which can be realized with a simple circuit and at low cost.

  According to this invention, every time the drainage operation is completed, the leading and trailing of the first and second drainage pumps are automatically switched using the mechanical switch means, and the circuit is simple and inexpensive. In addition, the operation time of the first and second drainage pumps can be made uniform.

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

  FIG. 1 schematically shows an arrangement example of a water turbine generator 10 in a hydroelectric power plant. The turbine generator 10 is composed of a generator and a turbine, and is configured by connecting shafts to each other. The turbine generator 10 is disposed on the floor 12 of the turbine chamber 11.

  An underground corridor 13 exists in the basement of the water turbine chamber 11, and a pit 14 for collecting water leakage is provided in the lower part of the underground corridor 13. Corresponding to the position of the pit 14, two drainage pumps 16 </ b> A and 16 </ b> B for discharging the water 15 accumulated in the pit 14 to the outdoors are provided in the underground passage 13. The drainage pump 16A constitutes a first drainage pump, and the drainage pump 16B constitutes a second drainage pump. On the floor surface 12 of the water turbine chamber 11, motors 17A and 17B for driving the drainage pumps 16A and 16B, respectively, and a drainage pump circuit 18 for controlling the operation of the motors 17A and 17B are arranged.

  As will be described later, in the “manual mode”, the drainage pumps 16A and 16B are individually operated by a user operation. In “No. 1 preceding mode”, the drain pump 16A is preceded and the drain pump 16B is followed. In “No. 2 precedent mode”, the drain pump 16B is preceded and the drain pump 16A is followed. Line. In the “automatic operation mode”, the preceding and following operations of the drain pumps 16A and 16B are switched every time a series of drain operations are completed.

  In the pit 14, a water level detecting means, for example, a float type water level detector, not shown, is provided. When the water level of the water 15 in the pit 14 becomes the first water level HWL1, the operation of the preceding drainage pump is started. Further, when the water level of the water 15 in the pit 14 rises and becomes the second water level HWL2 higher than the first water level HWL1, the operation of the subsequent drain pump is started. When the water level of the water 15 in the pit 14 decreases and becomes the third water level HWL0 lower than the first water level HWL1, the operation of the preceding and succeeding drain pump is stopped.

  Next, a specific example of the drainage pump circuit 18 will be described. FIG. 2 shows a connection diagram of the drainage pump circuit 18.

  A three-phase AC power source of R, S, and T drives the drainage pump 16A via an NFB (No Fuse Breaker) 101 (8WH1), an electromagnetic contactor 102 (88WH1), and an open phase detector 103 (49WH1). Is supplied to a motor 17A. The NFB 101 operates based on a current flowing through the line between the NFB 101 and the electromagnetic contactor 102, and enters a cut-off state when the value of this current exceeds a predetermined value.

  The line through which the R-phase AC power supply flows between the NFB 101 and the magnetic contactor 102 constitutes the mode switch 105 via the NFB 104 (8WHA1). Connected to one end of the switches 106m, 106a, 106f, 106s. The line through which the T-phase AC power supply between the NFB 101 and the magnetic contactor 102 flows is a manual return type connection switch that opens when an open phase is detected by the open phase detector 103 described above via the NFB 104 (8WHA1). 107 (49WH1) is connected to one end.

  FIG. 3 shows the switching position of the mode switch 105. The connection switches 106m, 106a, 106f, and 106s constituting the mode switching switch 105 are in a closed state when they are switched to the manual mode, the automatic mode, the No. 1 preceding mode, and the No. 2 preceding mode, respectively.

  The other end of the manual connection switch 106m is a stop operation switch 108 (3-88WH1), a start operation switch 109 (3-88WH1), and a coil 110 (88WH1) constituting the electromagnet of the electromagnetic contactor 102 described above. ) Is connected to the other end of the connection switch 107 through a series circuit. The operation switch 108 is opened only during operation, and is always closed. The operation switch 109 is closed only during operation and is always open. A self-holding auxiliary switch 111 (88WH1) is connected in parallel with the operation switch 109. The auxiliary switch 111 opens and closes together with the electromagnetic contactor 102 described above.

  The other end of the automatic connection switch 106 a is connected to one end of the connection switches 113 and 114 of the ratchet relay 112. The ratchet relay 112 constitutes mechanical switch means. The other end of the connection switch 113 is connected to a connection point between the operation switch 109 and the coil 110 via a connection switch 115 (33WH1X1). The other end of the connection switch 114 is connected to a connection point between the operation switch 109 and the coil 110 via the connection switch 116 (33WH2X2). The connection switch 115 constitutes a first connection switch, and the connection switch 116 constitutes a second connection switch.

  The connection switch 115 is in a closed state (conducting state) when the first water level HWL1 is detected as the water level rises by the above-described water level detection means, and then the third switch as the water level falls by the water level detection means. When the water level HWL0 is detected, it is in an open state (non-conducting state). The connection switch 116 is closed (conductive state) when the second water level HWL2 is detected as the water level rises by the water level detection means described above, and then the third level is detected as the water level falls by the water level detection means. When the water level HWL0 is detected, it is in an open state (non-conducting state).

  The other end of the first connection switch 106f is connected to the connection point of the connection switch 113 and the connection switch 115. The other end of the connection switch 106s preceding No. 2 is connected to a connection point between the connection switch 114 and the connection switch 116.

  The three-phase AC power supply of R, S, and T uses a drain pump 16B via an NFB (No Fuse Breaker) 201 (8WH2), an electromagnetic contactor 202 (88WH2), and an open phase detector 203 (49WH2). It is supplied to a motor 17B for driving. The NFB 201 operates based on a current flowing through the line between the NFB 201 and the electromagnetic contactor 202, and enters a cut-off state when the value of this current exceeds a predetermined value.

  The line through which the R-phase AC power source flows between the NFB 201 and the magnetic contactor 202 constitutes the mode changeover switch 105 via the NFB 204 (8WHA2). The switches 206m, 206a, 206s, and 206f are connected to one end. The line through which the T-phase AC power supply between the NFB 201 and the magnetic contactor 202 flows is a manual return type connection switch that opens when the phase loss detector 203 detects the phase loss via the NFB 204 (8WHA2). 207 (49WH2) is connected to one end.

  The connection switches 206m, 206a, 206s, and 206f constituting the mode changeover switch 105 are closed when the manual mode, the automatic mode, the No. 2 preceding mode, and the No. 1 preceding mode are switched to each other.

  The other end of the manual connection switch 206m is a stop operation switch 208 (3-88WH2), a start operation switch 209 (3-88WH2), and a coil 210 (88WH2) constituting the electromagnet of the electromagnetic contactor 202 described above. ) Is connected to the other end of the connection switch 207 through a series circuit. The operation switch 208 is opened only during operation, and is always closed. The operation switch 209 is closed only during operation and is always open. An auxiliary switch 211 (88WH2) for self-holding is connected in parallel with the operation switch 209. This auxiliary switch 211 opens and closes together with the electromagnetic contactor 202 described above.

  The other end of the automatic connection switch 206 a is connected to one end of the connection switches 213 and 214 of the ratchet relay 112. The other end of the connection switch 213 is connected to a connection point between the operation switch 209 and the coil 210 via the connection switch 215 (33WH1X1). The other end of the connection switch 214 is connected to a connection point between the operation switch 209 and the coil 210 via the connection switch 216 (33WH2X2). The connection switch 215 constitutes a first connection switch, and the connection switch 216 constitutes a second connection switch.

  The connection switch 215 is in a closed state (conducting state) when the first water level HWL1 is detected as the water level rises by the above-described water level detection means, and then the third switch as the water level falls by the water level detection means. When the water level HWL0 is detected, it is in an open state (non-conducting state). The connection switch 216 is in a closed state (conducting state) when the second water level HWL2 is detected as the water level rises by the above-described water level detecting means, and thereafter, the third water level is lowered by the water level detecting means. When the water level HWL0 is detected, it is in an open state (non-conducting state).

  The other end of the connection switch 206s preceding No. 2 is connected to a connection point between the connection switch 213 and the connection switch 215. The other end of the connection switch 206f preceding No. 1 is connected to a connection point between the connection switch 214 and the connection switch 216.

  In addition, the connection switch 302 is connected between the line through which the R-phase AC power supply flows and the line through which the T-phase AC power supply flows, in front of the NFBs 101 and 201, via an NFB (No Fuse Breaker) 301 (8WHA). A series circuit of the auxiliary switch 303 (88WH1), the auxiliary switch 304 (88WH2), and the coil 305 (10WH) constituting the electromagnet of the ratchet relay 112 is connected. The connection switch 302 constitutes the above-described mode changeover switch 105 and is in a closed state when set to the automatic mode changeover position. The auxiliary switch 303 is in an open / closed state opposite to that of the electromagnetic contactor 102 described above, and the auxiliary switch 304 is in an open / closed state opposite to that of the electromagnetic contactor 202 described above.

  In the ratchet relay 112 described above, the connection state of the connection switches 113, 114, 213, and 214 is changed each time a current flows through the coil 305. That is, in this ratchet relay 112, the connection switches 113 and 214 are closed and the connection switches 213 and 114 are opened (first state), and the connection switches 213 and 114 are closed and the connection switches 113 and 214 are opened. (Second state) can be taken, but each time a current flows through the coil 305, these states are switched.

  Next, the operation of the drain pump circuit 18 shown in FIG. 2 will be described.

  First, the case where the switching position of the mode switch 105 is in the manual mode will be described. In this manual mode, the connection switches 106m and 206m are in a closed state.

  In this case, when the operation switch 109 for activation is operated and closed, a current flows through the coil 110 and the electromagnetic contactor 102 is closed. Therefore, three-phase AC power is supplied to the motor 17A through the electromagnetic contactor 102, the drain pump 16A is driven by the motor 17A, and the drain pump 16A enters an operating state. Thus, when the electromagnetic contactor 102 is in a closed state, the connection switch 111 is also in a closed state, and a current continues to flow through the coil 110 even when the operation switch 109 is released and opened. The three-phase AC power supply state, and thus the operation state of the drainage pump 16A is continued.

  In such an operation state of the drainage pump 16A, when the operation switch 108 for stop is operated and opened, no current flows through the coil 110, and the electromagnetic contactor 102 is opened. Therefore, three-phase AC power is not supplied to the motor 17A, and the operation of the drain pump 16A is stopped.

  Although the detailed description is omitted, the operation on the drain pump 16B side is the same as the operation on the drain pump 16A side described above, and the drain pump 16B enters the operating state by operating the operation switch 209 for activation. Further, the operation of the drain pump 16B is stopped by operating the operation switch 208 for stopping.

  Next, a case where the switching position of the mode switch 105 is in the No. 1 preceding mode will be described. In the No. 1 preceding mode, the connection switches 106f and 206f are closed.

  In this case, when the water level rises and the water level detection means detects the first water level HWL1, the connection switch 115 is closed, a current flows through the coil 110, and the electromagnetic contactor 102 is closed. . Therefore, three-phase AC power is supplied to the motor 17A through the electromagnetic contactor 102, the drain pump 16A is driven by the motor 17A, and the drain pump 16A enters an operating state.

  Further, when the water level further rises and the water level detection means detects the second water level HWL2, the connection switch 216 is closed, a current flows through the coil 210, and the electromagnetic contactor 202 is closed. . Therefore, three-phase AC power is supplied to the motor 17B through the electromagnetic contactor 202, the drain pump 16B is driven by the motor 17B, and the drain pump 16B is in an operating state.

  Thus, in this No. 1 preceding mode, when the first water level HWL1 is reached, the drainage pump 16A is in the operating state, and when the second water level HWL2 is subsequently reached, the drainage pump 16B is in the operating state.

  Further, in the No. 1 preceding mode, the water level is lowered while the drain pump 16A is operating, or both the drain pumps 16A and 16B are operating, and the water level detecting means is the third water level. When HWL0 is detected, the connection switches 115 and 216 are opened. Therefore, the three-phase AC power is not supplied to the motor 17A or the motors 17A and 17B, and the operation of the drain pump 16A or the drain pumps 16A and 16B is stopped.

  Next, a case where the switching position of the mode switch 105 is in the No. 2 preceding mode will be described. In the No. 2 preceding mode, the connection switches 106s and 206s are in a closed state.

  In this case, when the water level rises and the water level detection means detects the first water level HWL1, the connection switch 215 is closed, a current flows through the coil 210, and the electromagnetic contactor 202 is closed. . Therefore, three-phase AC power is supplied to the motor 17B through the electromagnetic contactor 202, the drain pump 16B is driven by the motor 17B, and the drain pump 16B is in an operating state.

  When the water level further rises and the water level detection means detects the second water level HWL2, the connection switch 116 is closed, a current flows through the coil 110, and the electromagnetic contactor 102 is closed. . Therefore, three-phase AC power is supplied to the motor 17A through the electromagnetic contactor 102, the drain pump 16A is driven by the motor 17A, and the drain pump 16A enters an operating state.

  Thus, in this No. 2 preceding mode, when the first water level HWL1 is reached, the drainage pump 16B is in the operating state first, and when the second water level HWL2 is subsequently reached, the drainage pump 16A is in the operating state.

  Further, in the No. 2 preceding mode, the water level is lowered while the drain pump 16B is operating or both the drain pumps 16B and 16A are operating, and the water level detecting means is the third water level. When HWL0 is detected, the connection switches 215 and 116 are opened. Therefore, the three-phase AC power is not supplied to the motor 17B or the motors 17B and 17A, and the operation of the drain pump 16B or the drain pumps 16B and 16A is stopped.

  Next, the case where the switching position of the mode switch 105 is in the automatic mode will be described. In this automatic mode, the connection switches 106a, 206a, 302 are in a closed state. Here, when the ratchet relay 112 is in the first state, that is, when the connection switches 113 and 214 are closed and the connection switches 213 and 114 are in the open state, the connection state is the same as that of the No. 1 preceding mode described above. When the first water level HWL1 is reached, the drainage pump 16A is in the operating state, and when the second water level HWL2 is subsequently reached, the drainage pump 16B is in the operating state. Further, in this case, when the drainage pump 16A is in operation or both the drainage pumps 16A and 16B are in operation, the water level decreases and the water level detection means detects the third water level HWL0. The operation of the drain pump 16A or the drain pumps 16A and 16B is stopped.

  While the drain pump 16A or the drain pumps 16A and 16B are in an operating state, the connection switch 303 or the connection switches 303 and 304 are open and no current flows through the coil 305. However, when the electromagnetic contactor 102 or the electromagnetic contactors 102 and 202 are opened and the operation of the drain pump 16A or the drain pumps 16A and 16B is stopped, the connection switch 303 or the connection switches 303 and 304 are It becomes a closed state, and a current flows through the coil 305. Therefore, the ratchet relay 112 is changed from the first state to the second state, that is, the connection switches 213 and 114 are closed and the connection switches 113 and 214 are opened.

  In this case, the connection state is the same as in the No. 2 preceding mode described above, and when the first water level HWL1 is reached, the drainage pump 16B is in the operating state first, and then when the second water level HWL2 is reached, the drainage pump 16A. Becomes the operating state. Further, in this case, when the drainage pump 16B is in operation or both the drainage pumps 16B and 16A are in operation, the water level decreases and the water level detection means detects the third water level HWL0. The operation of the drain pump 16B or the drain pumps 16B and 16A is stopped.

  While the drain pump 16B or the drain pumps 16B and 16A are in an operating state, the connection switch 304 or the connection switches 304 and 303 are open and no current flows through the coil 305. However, when the operation of the drain pump 16B or drain pumps 16B, 16A is stopped when the electromagnetic contactor 202 or the electromagnetic contactors 202, 102 are opened, the connection switch 304 or the connection switches 304, 303 are It becomes a closed state, and a current flows through the coil 305. Therefore, the ratchet relay 112 is changed from the second state to the first state, that is, the connection switches 113 and 214 are closed and the connection switches 213 and 114 are opened.

  Similarly, each time a series of drainage operations by either or both of the drainage pumps 16A and 16B is completed, the state of the ratchet relay 112 is changed from the first state to the second state, or from the second state. The operation is switched to the first state, and the operation in the No. 1 preceding mode and the operation in the No. 2 preceding mode are alternately performed.

  As described above, in the present embodiment, when the switching position of the mode changeover switch 105 is in the automatic mode, the switching of the preceding and following of the drainage pumps 16A and 16B is performed every time a series of drainage operations are completed. Thus, the operation time of the drainage pumps 16A and 16B can be made uniform. In the present embodiment, the leading and trailing switching of the drainage pumps 16A and 16B is performed by the ratchet relay 112, which is mechanical switch means, and can be realized with a simple circuit and at low cost.

  In the above-described embodiment, the manual mode, the No. 1 preceding mode, and the No. 2 preceding mode are provided in addition to the automatic mode in order to cope with an inspection or failure.

  The present invention can achieve a uniform operation time of the first and second drainage pumps with a simple circuit and at low cost. For example, a drainage pump that drains water in a pit of a hydroelectric power plant. Applicable to equipment.

It is a figure which shows roughly the example of arrangement | positioning of a water turbine generator. It is a connection diagram of a drainage pump circuit. It is a figure which shows the switching position of a mode switch.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Turbine generator, 11 ... Turbine room, 12 ... Floor surface, 13 ... Underground corridor, 14 ... Pit, 15 ... Water, 16A, 16B ... Drain pump, 17A, 17B ... Motor, 18 ... Drain pump circuit, 105 ... Mode changeover switch, 112 ... Ratchet relay

Claims (1)

A first drain pump;
A second drainage pump;
Water level detection means for detecting the water level;
When the first water level is detected by the water level detecting means, the first connection that is in a conductive state so that the operation of the preceding drain pump is started among the first drain pump and the second drain pump. A switch,
When the second water level higher than the first water level is detected by the water level detecting means, the operation of the subsequent drain pump of the first drain pump and the second drain pump is started. A second connection switch that becomes conductive;
Each time a series of drainage operations by one or both of the first drainage pump and the second drainage pump is completed, the preceding and following of the first drainage pump and the second drainage pump are switched. A drainage pump device comprising: mechanical switch means for switching a connection position of the first connection switch and the second connection switch.

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