JP2017106469A - Water supply unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To curb a pressure loss to a maximum extent when a paddle type flow sensor is used.SOLUTION: A water supply unit comprises: a self-priming chamber which is installed at a discharge port side of a vortex pump driven by a drive motor; a gas-liquid separation plate which is installed in a vertical direction inside the self-priming chamber; a concave section which is installed on an inner wall face above the gas-liquid separation plate at the discharge port side in the self-priming chamber; a magnetic sensor installed at a bottom face side of the concave section; a pivot shaft which is arranged on the concave section in a direction orthogonal to a flow direction of fluid; a paddle which is pivotally supported by the pivot shaft, positioned at a gas-liquid separation plate side when no fluid flows, oscillated in a direction to approach the magnet sensor when the fluid flows, and mounted with a built-in magnet to be stored in the concave section; and an electric section which controls the drive motor on the basis of output from the magnet sensor.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a water supply unit used for water supply from a water receiving tank, pumping well water, and the like.

  There is known a water supply unit provided with a flow rate switch that detects that the faucet at the end of the water supply is closed by detecting the flow rate of water flowing through the flow path (see, for example, Patent Document 1).

  FIG. 8 is a cross-sectional view showing the water supply unit 200 in which the float type flow rate switch 240 is provided above the self-priming chamber 220. The water supply unit 200 is provided on the base 210, a self-priming chamber 220 for self-priming water from a water receiving tank or well water when the power is turned on, and a sensor provided on the self-priming chamber 220. The unit 230, the eddy current pump 260, an electric motor 270 that drives the eddy current pump 260, an accumulator 280, and an electrical unit 290 that controls each part are provided.

  In the self-priming chamber 220, a gas-liquid separation plate 221 is provided along the vertical direction. The sensor unit 230 includes a sensor body 231 having a hollow inside. A flow path 232 is connected to the sensor body 231 and is connected to the discharge port 233. A flow switch 240 is provided on the self-priming chamber 220 side of the sensor body 231, and a pressure sensor 250 is provided on the accumulator 280 side. The flow rate switch 240 is a float receiving part 241 having a cylindrical flow path provided on the self-priming chamber 220 side, and a float 242 provided inside the float receiving part 241 and incorporating a magnet that moves up and down according to the flow rate. And a reed switch 243 that opens and closes (ON / OFF) depending on the presence or absence of a magnetic force that changes depending on the position of the float 242.

  The stop flow rate detected by the flow switch 244 is set to 3 to 4 L / min in consideration of the capacity of the accumulator 280 and the stop time.

  The electrical unit 290 is an electric system such as a motor that drives and controls each part, a Hall IC for detecting a rotor position, a pressure sensor, a temperature sensor, an operation controller, a control unit including a microcomputer, a drive circuit, a temperature sensor, and peripheral circuits. Parts are mounted.

  Since the float type flow rate switch 240 requires a space for the float 242 to move up and down, the mounting position to the self-priming chamber 220 is restricted, or the self-priming chamber 220 has a complicated shape. was there. Furthermore, in order to detect a small flow rate of 3 to 4 L / min, which is a standard stop flow rate of the water supply unit 200, it is necessary to set a narrow gap between the inner diameter wall of the float receiving portion 241 and the outer peripheral portion of the float 242. is there. For this reason, pressure loss becomes large in the middle and large flow rate regions, and the pumping performance of the water supply unit 200 is lowered. In addition, a sudden increase in flow rate when the pump is activated may cause the float 242 to rise rapidly and collide with the sensor body 231, and the contact of the reed switch 243 may be brought into close contact due to the impact. In order to prevent this, if a buffer rubber is added, the cost of parts increases. In addition, even if the buffer rubber is added, the impact on the sensor body 231 remains. Therefore, when the flow switch 240 and the pressure sensor 250 are integrated, the impact propagates to the pressure sensor 250 side, and the pressure sensor 250 There is a risk of failure. In addition, there is a possibility that the stop flow rate may change due to adhesion of scale to the float 242 or adhesion of iron sand to the magnet built in the float 242, or fine sand enters between the float 242 and the float receiving part 241. There is a risk that the float 242 will not descend and the pump device will not stop. In order to prevent such a problem, a flow switch that can detect the amount of pumped water over a wide range is required, but its specific configuration is not disclosed.

  In addition, if the pump becomes unable to pump due to water falling in the pumping pipe, etc., the pressure sensor will detect a low pressure and the flow switch will detect no flow, but it will shut down, but the faucet will close and the discharge pipe will be closed. As the water is filled with water, the pressure sensor detects high pressure, and the float, which is a flow rate switch, moves up and down repeatedly due to air bubbles in the pump self-priming chamber. The suction chamber overheats abnormally.

  As a flow rate detection method other than the float method, an electromagnetic flow method, an ultrasonic method, a vortex flow method, an impeller method, a paddle method, and the like are known.

JP 2007-187002 A

The water supply unit described above has the following problems. That is, the electromagnetic flow rate type and the ultrasonic type have high accuracy of flow rate detection, but are expensive because the measurement mechanism is complicated.
In the vortex flow type, the vibration frequency of Karman vortex generated on the secondary side of the baffle plate formed in the flow path is detected by a piezoelectric element or the like, but pressure loss due to the baffle occurs. The impeller type has a feature that a pulse output proportional to the flow rate can be obtained. However, a pressure loss occurs because the cross section of the flow path is narrowed and deformed in order to rotate the impeller forward.

  On the other hand, the paddle type is inexpensive, the paddle working space is small, and the paddle rotates along the direction of flow when the flow rate is large. Therefore, pressure loss can be suppressed compared to the float type, vortex flow type, and impeller type. Such advantages are known.

  FIG. 9 shows a main part of a water supply unit using such a paddle type flow switch 300. In FIG. 9, K1 to K3 indicate tube members that suck up water from the water supply tank or well from the water supply unit. The flow switch 300 is attached to the outer wall portion of the tube member K1, and includes a support portion 310 provided with a substrate or the like therein, a sensor body 320 protruding into the tube member K1 and formed in a rod shape, and the flow of the tube member K1. And a paddle member 330 disposed in the path and supported to be swingable with respect to the sensor main body 320.

  The sensor body 320 is provided with a latch type Hall IC 321 that is operated by the magnetic force of a permanent magnet. The paddle member 330 is provided with a permanent magnet 331. The magnetic force of the permanent magnet 331 is within the detection range of the latch type Hall IC 321 when the paddle member 320 is in the initial position (downward) where the paddle member 320 is not swinging, the output signal becomes H, and the paddle member 330 is moved relative to the initial position. In the oscillating state (broken line M in FIG. 9), the latch type Hall IC 321 falls outside the detection range, the output signal becomes L, and the stop flow rate can be measured at the H / L level.

  The paddle type flow switch 300 has a problem that the sensor body 320 protrudes into the pipe member K1 and pressure loss occurs.

  In many cases, the water supply unit is installed outdoors, and in the cold season, a temperature sensing element such as a thermistor is inserted into the self-priming chamber to energize the warming heater to prevent freezing. In addition, the inverter water supply unit that performs constant discharge pressure control estimates the self-priming chamber temperature with a temperature sensor built in the electrical component, and sets a low temperature value with a margin higher than the temperature at which freezing may occur, While the pump was stopped, the pump was forcibly started to reach the target pressure when the inside of the electrical component fell below the low temperature value.

  However, when the temperature sensing element is mounted in the self-priming chamber, there is an increase in manufacturing cost and wiring complexity. When the temperature sensing element is arranged on the substrate in the electrical component, the cost increase is minimized. However, there is a drawback that the temperature of the self-priming chamber cannot be accurately detected and wasteful power consumption occurs.

  Therefore, an object of the present invention is to provide a water supply unit capable of suppressing pressure loss as much as possible even when a paddle type flow switch is used.

  In order to solve the above problems and achieve the object, the water supply unit of the present invention is configured as follows.

  A pump, a drive motor for driving the pump, a self-priming chamber provided on the discharge port side of the pump, a gas-liquid separation plate provided in a vertical direction in the self-priming chamber, and the gas-liquid separation A wall surface of the self-priming chamber above the plate and provided on the discharge port side of the self-priming chamber, a magnetic sensor provided on the bottom surface side of the concave portion, and a fluid flow direction provided in the concave portion Oscillating shaft arranged in a direction intersecting with the oscillating shaft, and pivotally supported by the oscillating shaft, and is located on the gas-liquid separation plate side when there is no fluid flow, and the magnetic sensor by the fluid flow And a paddle with a built-in magnet accommodated in the recess, and an electrical component that controls the drive motor based on an output from the magnetic sensor. .

  According to the present invention, it is possible to suppress pressure loss as much as possible even when a paddle type flow switch is used.

The top view which cuts and shows the water supply unit which concerns on one Embodiment of this invention partially. The longitudinal cross-sectional view which shows the self-priming chamber integrated in the water supply unit. The top view which expands and shows the self-priming chamber integrated in the water supply unit. Sectional drawing which cuts and shows the self-priming chamber incorporated in the water supply unit by the AA line in FIG. The longitudinal cross-sectional view which shows the pressure sensor integrated in the water supply unit. The graph which shows the relationship between the flow volume and the head of the water supply unit. The graph which shows the relationship between the magnetic flux density and output voltage in the magnetic sensor integrated in the water supply unit. The longitudinal cross-sectional view which shows an example of a water supply unit. The longitudinal cross-sectional view which shows the principal part of the water supply unit with which the paddle type flow switch was incorporated.

  FIG. 1 is a plan view showing a water supply unit 10 partially cut away according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a self-priming chamber 50 incorporated in the water supply unit 10, and FIG. 3 is a water supply unit 10. 4 is an enlarged plan view showing the self-priming chamber 50 incorporated in FIG. 4, FIG. 4 is a cross-sectional view showing the self-priming chamber incorporated in the water supply unit 10 taken along line AA in FIG. 3, and FIG. FIG. 6 is a graph showing the relationship between the flow rate of the water supply unit 10 and the head, and FIG. 7 is a graph showing the relationship between the magnetic flux density and the output voltage of the magnetic sensor incorporated in the water supply unit 10. It is a graph which shows a relationship.

  The water supply unit 10 is a water supply unit that discharges by an inverter and performs constant pressure control. As shown in FIG. 1, the water supply unit 10 includes a base 11 that is fixed to a floor surface or the like. On this base 11, a suction pipe 20 connected to a water receiving tank, a well or the like, a vortex pump 30 for sucking water through the suction pipe 20, and an electric motor (drive motor) 40 for driving this vortex pump 30. And a self-priming chamber 50 for self-priming water from a water receiving tank or well when the power is turned on, a flow rate detecting unit 70 and a pressure detecting unit 80 provided in the upper part of the self-priming chamber 50, and the self-priming chamber 50 A connected discharge pipe 90, an accumulator 100 attached to one end of the discharge pipe 90, a discharge port 110 attached to the other end of the discharge pipe 90, and an electrical component 120 for controlling each part Is provided. The flow rate detection unit 70 and the pressure detection unit 80 are separated in the horizontal direction. The electrical unit 120 includes a calculation unit 121 that performs calculation based on a predetermined operation program, a table that determines the relationship between the magnetic flux density and the output voltage in the power supply voltage, and a storage unit 122 that stores a reference water temperature and the like.

  As shown in FIG. 2, the self-priming chamber 50 is a bottomed cylindrical metal lower self-priming chamber 51, a gas-liquid separation wall 52 provided in the lower self-priming chamber 51, and the lower self-priming chamber 51. An upper self-priming chamber 53 made of a resin material covering the opening, and a gas-liquid separation plate 54 provided in the upper self-priming chamber 53 and formed along the vertical direction are provided. The lower self-priming chamber 51 and the upper self-priming chamber 53 are liquid-tightly connected by a packing 55. The bottom of the lower self-priming chamber 51 communicates with the discharge port of the vortex pump 30. Further, a discharge hole 53 a is provided in the upper side wall of the upper self-priming chamber 53, and is connected to the discharge pipe 90 via a connecting curved pipe 88. The gas-liquid separation plate 54 partitions the substantially lower half side of the upper self-priming chamber 53 into the vortex pump 30 side and the discharge pipe 90 side.

  Furthermore, a concave portion 56 is provided in the upper portion of the upper self-priming chamber 53 (the ceiling side when covered), and a flow rate detection unit 70 is provided in the concave portion 56. The recess 56 is formed in such a size that the paddle 72 is accommodated when the paddle 72 swings in the direction approaching the magnetic sensor 74, and the lower surface of the paddle 72 at that time is flush with the upper wall surface of the discharge hole 53a. Yes.

  The flow rate detector 70 is provided in the vicinity of the discharge hole 53a. The flow rate detection unit 70 is attached to the upper portion of the upper self-priming chamber 53, and is exposed and attached to the self-priming chamber 50, and a paddle 72 that is swingably attached to the bearing portion 71. A bearing 71 and a liquid-tight sensor storage 73 provided at a position spaced apart in the horizontal direction are provided. Inside the sensor housing 73, a magnetic sensor 74 and a temperature sensor 76 for detecting the magnetic flux of the permanent magnet 72c are housed, and these output signals are output to the electrical equipment section 120 via the output board 77. Since the lower bottom surface of the sensor housing portion 73 is formed thin and protrudes downward, the temperature of the water in the upper self-priming chamber 53 can be accurately detected by the temperature sensor 76.

  As shown in FIG. 3, the bearing portion 71 has a pair of protrusions 71a protruding downward, and a shaft 71b provided between the protrusions 71a. The paddle 72 includes a plate-shaped paddle plate 72 a, a cylindrical portion 72 b provided on the paddle plate 72 a, and a permanent magnet 72 c attached inside the paddle 72. The cylindrical portion 72b is engaged with the shaft 71b to form a bearing.

  The space in which the paddle 72 swings is at a position facing the discharge hole 53 a of the self-priming chamber 50. That is, as shown in FIG. 2, the normal line R on the surface of the paddle 72 positioned on the lower side and the normal line T of the discharge hole 53a are positioned in parallel.

  The magnetic sensor 74 uses, for example, a linear output type that outputs a voltage proportional to the detected magnetic flux density. In the magnetic sensor 74, when the paddle 72 rotates in the positive direction as the flow rate increases, the detected magnetic flux density increases and the output voltage increases, and when the paddle 72 rotates in the stationary direction as the flow rate decreases, it is detected. The magnetic flux density is set so that the output voltage decreases. Thereby, in the electrical equipment part 120, a flow rate can be measured and the stop flow rate of the water supply unit 10 can be adjusted.

  Since the flow rate detection unit 70 is provided at a position between the upper end of the gas-liquid separation plate 54 and the discharge hole 53a, the paddle 72 swings upward even when the amount of water is small. It becomes possible to do.

  A through-hole 57 that penetrates the upper self-priming chamber 53 is provided in the upper bottom portion of the upper self-priming chamber 53 at a position spaced apart from the concave portion 56 in the horizontal direction. A pressure detection unit 80 is disposed above the through hole 57. As shown in FIGS. 4 and 5, the pressure detection unit 80 is locked to the locking part 81 formed on the inner wall surface of the through hole 57 and the locking part 81, and the through hole 57 A diaphragm 82 made of rubber that closes the disk, a disk-like cover member 83 provided above the diaphragm 82, a bridge voltage amplification substrate 84 stacked on the cover member 83, the bridge voltage amplification substrate 84, and A pressing plate 85 made of a resin material and a fastener 85a for fastening the cover member 83 are provided.

  An opening 83a is provided at the center of the cover member 83, and a bottomed cylindrical packing 83b in which a step 83e for preventing the pressure sensor 86 from falling off is formed is accommodated on the inner wall surface of the opening 83a. Yes. In the cover member 83, the upper ring portion 83c and the lower ring portion 83d are provided coaxially. The outer peripheral surface of the lower annular portion 83d is locked to the inner peripheral surface of the locking portion 81 and presses the diaphragm 82.

  Inside the packing 83b, a semiconductor type pressure sensor 86 attached to the lower surface of the bridge voltage amplification substrate 84 is inserted and arranged from above. The lower end of the packing 83 b is exposed in a silicon oil chamber 87 formed between the cover member 83 and the diaphragm 82.

  The silicon oil chamber 87 is filled with silicon oil S. A non-corrosive liquid other than silicon oil may be used. The pressure sensor 86 and the cover member 83 are liquid-tightly fastened by the packing 83b so that silicon oil does not leak to the outside.

  The bridge voltage amplification substrate 84 is equipped with a circuit that amplifies the differential voltage output of the pressure sensor 86 and converts it into a single-ended output. Further, the bridge voltage amplification substrate 84 is connected to the output substrate 77.

  The power source of the magnetic sensor 74, the temperature sensor 76, and the pressure sensor 86 is unified to 5 V, for example, and if the output voltage of the magnetic sensor 74, the temperature sensor 76, and the pressure sensor 86 is digitized for digital communication, the pressure sensor A five-wire composite sensor of 86 amplification signals, voltage outputs of the magnetic sensor 74 and temperature sensor 76, and ground (0 V) is configured. Such a composite sensor can simplify the connection work with the electrical component 120. If a semiconductor pressure sensor with a built-in amplification / signal conversion circuit is employed as the pressure sensor 86, an amplifier circuit is not required for the bridge voltage amplification substrate 84.

In addition, the output board 77 is equipped with a microcomputer 77a having a built-in amplification / conversion circuit for the pressure sensor 86, and there are few signal lines as a 4-wire sensor of a DC power supply, ground (0V), data transmission line, and data reception line. You may communicate by.
In addition, by adopting a system in which three types of data of pressure, magnetism, and temperature are transmitted by asynchronous serial communication with the electrical component unit 120, a configuration that has fewer signal lines and is resistant to noise may be employed.
Moreover, it is good also as parallel communication.

  The water supply unit 10 configured as described above operates as follows. First, the normal water supply operation, the failure self-judgment operation, and finally the freeze prevention operation will be described.

  The water supply process operates as follows. When the power is turned on, the electric motor 40 rotates, and the self-priming operation of pumping water from the water receiving tank or well by the vortex pump 30 is started. At this time, inside the self-priming chamber 50, the gas-liquid separation plate 54 separates and exhausts air from the water containing the air inside the pumping pipe. After the completion of pumping, the water flow from the discharge port of the vortex pump 30 passes through the upper part of the gas-liquid separation plate 54. Therefore, the water flow is guided to the vicinity of the paddle 72 of the flow rate detection unit 70 during the pump operation. That is, even if the amount of water is small, the paddle 72 receives the water flow toward the discharge hole 53a, and is pushed upward to approach the magnetic sensor 74, so that the standard stop flow rate of the water supply unit 10 is 4 L / min ( It is possible to detect a low flow rate of about 67 mL / s).

  Further, when the paddle 72 of the flow rate detection unit 70 swings substantially horizontally when the flow rate is large, the entire paddle 72 is accommodated in the recess 56. At this time, since the lower surface of the paddle 72 is flush with the inner wall surface of the upper self-priming chamber 53, there is no resistance to water flow. Thereby, pressure loss can be minimized. FIG. 6 shows that when the same paddle type flow rate detection unit is used, the pumping performance α1 and pump efficiency η1 in the water supply unit 10 having a configuration in which the paddle 72 is housed in the recess 56, and a general recess are not provided. It is explanatory drawing which compares and shows the pumping performance (alpha) 2 and pump efficiency (eta) 2 in the water supply unit which has a structure. As shown in FIG. 6, the water supply unit 10 has improved pumping performance and pump efficiency in a flow rate range of about 10 L / min or more than a general water supply unit. For example, in the case of pump efficiency, the pump efficiency η2 is 38% (29 L / min) at the maximum, but the pump efficiency η1 is improved to 40% (31 L / min) at the maximum.

  Further, when the outer bottom surface of the sensor storage portion 73 protrudes downward and the paddle 72 rotates upward, it strikes in a small area. For this reason, it functions as a stopper that restricts the rotation of the paddle 72 exceeding 90 degrees. Accordingly, it is possible to prevent the paddle 72 from sticking to the upper part of the outer wall of the self-priming chamber for a long time when the flow rate is high, and to prevent the paddle 72 from rotating in the stationary direction when the flow rate is low.

  In the electrical equipment unit 120, the following processing is performed when the flow rate detection unit 70 detects the flow rate. That is, even if the flow rate of the water generated by the pump is constant, the paddle 72 swings somewhat. For this reason, for example, it is preferable to perform a process of averaging 10 pieces of data at intervals of 100 ms per second by the microcomputer of the electrical unit 120. This is to average out the fluctuation of the paddle 72 due to the water flow.

  The electrical unit 120 averages the output voltage of the magnetic sensor 74 at a predetermined interval (for example, 1 second), and after the operation interlock is completed, the state in which the output voltage is equal to or less than the stop flow rate is a fixed time (for example, 2 seconds). If it continues, it is determined that the flow rate is below the stop flow rate, and the pump operation is stopped.

  Next, the relationship between the power supply voltage and the rotation angle of the paddle 72, the magnetic flux density, the output voltage of the magnetic sensor 74 and the flow rate will be described. That is, for example, as shown in FIG. 7, the water supply unit 10 has a magnetic flux density of N pole 0.5 to 48 mT with respect to the rotation angle 0 to 90 ° of the paddle 72 when the power supply (Vcc) is 5V. The output voltage of the magnetic sensor 74 is 2.5 to 5.0V.

  The rotation angle at a flow rate of 2 L / min is about 60 °, the magnetic flux density at the position of the magnetic sensor 74 is about 6.6 mT, and the output voltage of the magnetic sensor 74 is 2.9 V. Furthermore, the rotation angle at a flow rate of 4 L / min, which is a stop flow rate, was about 80 °, the magnetic flux density at the position of the magnetic sensor 74 was about 11 mT, and the output voltage of the magnetic sensor 74 was 3.3V.

  For such microcomputer parameters, the table shown in FIG. 7 is stored in the storage unit 122 of the electrical unit 120, so that the stop flow rate and the like can be set. Note that a similar table may be stored for power supplies of 4V and 3V as shown in FIG.

  Thus, there is an effect that pressure loss can be prevented in the water supply operation. In designing, the following effects are obtained. In general, when designing a paddle type flow rate detector, the pressure receiving area and specific gravity of the paddle, the surface magnetic flux density of the built-in magnet, the through-flow angle of the magnetic flux to the magnetic sensor, the magnetic flux sensitivity of the magnetic sensor are required. It is necessary to consider various parameters such as the stop flow rate and the flow rate determined by the cross-sectional area of the gas-liquid separation plate upper part and discharge port in the self-priming chamber.

  In the flow rate detection unit 70, by selecting a magnetic sensor 74 having a magnetic sensitivity suitable for the flow rate range to be detected, as shown in FIG. 7, the detected magnetic flux density greatly decreases as the flow rate decreases near the stop flow rate. To do.

  An output voltage (for example, 3.3 V) corresponding to the magnetic flux density (for example, 11 mT) at a desired stop flow rate (for example, 4 L / min) may be determined by an actual machine test and set as a microcomputer parameter with high accuracy. The stop flow rate can be set.

  In addition, if the operation is performed at a stop flow rate in an actual machine test and the output voltage of the magnetic sensor 74 is read by operating the electrical component 120, variations such as the magnetic sensor 74 and the magnetic flux density of the magnet can be corrected. It becomes. In addition, in the installation site, when it is desired to increase the stop flow rate in order to expand the intermittent operation area when an accumulator is added, it is possible to change the stop flow rate by operating the electrical unit 120.

  Next, the failure self-determination operation will be described. When the output voltage of the pressure sensor 86 is less than a certain threshold value, for example, 0.3 V (= discharge head 0 m) for a certain period of time, the electrical equipment unit 120 determines that the pressure sensor 86 has failed.

Furthermore, when the electrical unit 120 is out of a certain threshold range that is a normal operation range, for example, 0.7 V (100 ° C.) to 2.2 V (−20 ° C.), for a certain period of time. It is determined that the temperature sensor 76 has failed.
Moreover, if the microcomputer 77a is mounted on the output board 77, the pressure sensor failure and the temperature sensor failure are detected, and the pressure sensor failure signal and the temperature sensor failure signal are sent to the electrical component 120, the electrical component 120 side The calculation unit 121 does not need to perform AD conversion or failure detection on the above three data of pressure, magnetism, and temperature, and can concentrate on motor control and discharge circuit protection detection for constant discharge pressure control. In response to this, a high-precision and high-speed response is possible.

  Furthermore, if the pressure / flow rate (magnetism) / temperature data is not transmitted for a certain period of time on the electrical component 120 side, it is determined that the microcomputer on the sensor side has failed, and the failure is stopped.

  On the other hand, the water supply unit 10 measures the temperature of the self-priming chamber after the pump is stopped by the temperature sensor 76, and stores it as the reference water temperature in the electrical unit 120. On the other hand, when the temperature of the self-priming chamber is measured during the pump operation and the electrical component 120 rises above the “reference water temperature + superheat temperature difference”, the eddy current pump 30 is stopped due to failure. As a result, the eddy current pump 30 detects that the shutoff operation or pumping is impossible for some reason and the temperature inside the self-priming chamber rises, and the eddy current pump 30 is safely stopped. Accordingly, if the overheat temperature difference is determined to be a sufficient margin, for example, 10 ° C. in consideration of fluctuations in the water temperature, the failure can be detected with a small temperature rise by determining the overheat state by comparison with the reference water temperature. Therefore, it is possible to prevent overheating deformation of the resin housing or the like.

  Furthermore, if the reference water temperature is set, it is not necessary to individually set the water temperature in the overheated state in the normal fresh water supply unit and the hot water supply unit, and the same product can be used.

  Further, when the reference water temperature is higher than 40 ° C., it is possible to perform variable speed operation by reducing the discharge pressure or the maximum rotation speed so that the temperature rise of the electric motor 40 does not become excessive.

  Next, the freeze prevention process will be described. As the freeze prevention process, there are low speed operation and intermittent operation when the temperature is lowered, both of which are appropriately selected depending on the type of the vortex pump 30, the control method, the user's selection, etc. Set up.

  In the low speed operation, when the water temperature detected by the temperature sensor 76 while the pump is stopped falls below the set freezing prevention operation temperature (for example, 3 ° C.), the electrical unit 120 is about 50% of the rated maximum rotation speed. Operate the pump at low speed. Further, when the discharge pressure is lower than the starting pressure, a normal discharge pressure constant control operation is performed. The freeze prevention operation is stopped when the water temperature detected during the operation is equal to or higher than a set freeze prevention operation stop temperature (for example, 6 ° C.).

  In the low speed operation, by setting the rotation speed to a low speed, it is possible to reduce the power consumption and efficiently keep the temperature of the pump unit and the self-priming chamber.

  In the intermittent operation, when the water temperature detected by the temperature sensor 76 while the pump is stopped falls below the set freezing prevention operation temperature (eg, 3 ° C.), the electrical component unit 120 operates the pump intermittently (eg, 10). (Second run / stop for 10 seconds). Note that the intermittent operation is stopped when the water temperature detected during operation or stop becomes equal to or higher than the set freeze prevention operation stop temperature (eg, 6 ° C.).

  In intermittent operation, in the case of a pump using a normal induction motor, the rotation speed cannot be controlled. Therefore, when continuously operated, the water temperature rapidly rises in the pump section, but there is a time lag until it is conducted to the temperature sensing element. This is because the water temperature during stoppage during intermittent operation is detected, so that the operation is determined to be resumed, and abnormal overheating of the pump unit is prevented.

  As described above, according to the water supply unit 10 according to the present embodiment, it is possible to suppress the pressure loss as much as possible even when the paddle type flow rate detection unit is used. In addition, even if the sensor fails, the pump can be stopped without affecting other parts, so that the housing and the electric motor can be prevented from being damaged. Furthermore, power consumption can be significantly reduced when preventing freezing.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 ... Water supply unit, 20 ... Suction pipe, 30 ... Eddy current pump, 40 ... Electric motor (drive motor), 50 ... Self-priming chamber, 53 ... Upper self-priming chamber, 53a ... Discharge hole, 54 ... Gas-liquid separation plate, 56 ... Recess, 70 ... Flow rate detection part, 71 ... Bearing part, 72 ... Paddle, 73 ... Sensor housing part, 75 ... Magnetic sensor, 76 ... Temperature sensor, 77 ... Output board, 80 ... Pressure detection part, 82 ... Diaphragm, 83 DESCRIPTION OF SYMBOLS ... Cover member, 83b ... Packing, 84 ... Bridge voltage amplification board | substrate, 86 ... Pressure sensor, 88 ... Connection curved pipe, 90 ... Discharge pipe, 100 ... Accumulator, 110 ... Discharge port, 120 ... Electrical equipment part, S ... Silicon oil.

Claims (12)

A pump,
A drive motor for driving the pump;
A self-priming chamber provided on the discharge port side of the pump;
A gas-liquid separation plate provided along the vertical direction in the self-priming chamber;
A recess provided on the discharge port side of the self-priming chamber on the wall of the self-priming chamber above the gas-liquid separation plate;
A magnetic sensor provided on the bottom side of the recess;
An oscillating shaft provided in the recess and arranged in a direction intersecting the fluid flow direction;
It is pivotally supported by this oscillating shaft and is located on the gas-liquid separation plate side when there is no fluid flow, and oscillates in the direction close to the magnetic sensor by the fluid flow and is accommodated in the recess. Paddles with built-in magnets,
A water supply unit comprising: an electrical component that controls the drive motor based on an output from the magnetic sensor. The magnetic sensor outputs a voltage proportional to the detected magnetic flux density,
The water supply unit according to claim 1, wherein the electrical unit can set a stop flow rate of the pump based on an output of the magnetic sensor.   The water supply unit according to claim 1, wherein the electrical unit is capable of selecting a plurality of stop flow rates of the pump. A through hole provided in an upper portion of the self-priming chamber;
A diaphragm that closes the through hole;
A cover member provided in the through-hole and forming a cavity filled with a non-corrosive liquid between the diaphragm and an opening hole in the center,
A cylindrical packing disposed along the inner wall surface of the opening hole;
The water supply unit according to claim 1, further comprising a pressure sensor disposed at a center of the packing and having a tip end disposed toward the cavity portion.   5. The water supply according to claim 4, wherein when the output voltage of the pressure sensor is less than a certain threshold value for a certain period of time, the electrical component determines that the pressure sensor has failed and outputs a pressure sensor failure signal. unit.   2. The magnetic sensor is housed together with a temperature sensor in a sensor housing portion in which the wall surface on the self-priming chamber side is formed thinly and liquid-tight with respect to the self-priming chamber. The water supply unit described.   The water supply unit according to claim 6, wherein the electrical unit determines that the temperature sensor is out of order when the output voltage of the temperature sensor is out of a preset normal operating range for a certain period of time.   The electrical component stores the temperature of the self-priming chamber measured by the temperature sensor after the pump is stopped as a reference water temperature, detects the temperature of the self-priming chamber during pump operation, and the temperature of the self-priming chamber is higher than the reference water temperature. The water supply unit according to claim 6, wherein when the temperature rises to a predetermined overheat temperature difference or more, the pump is stopped by failure.   When the water temperature detected while the pump is stopped falls below the set antifreeze operation temperature, the electrical unit operates the pump intermittently, and the water temperature detected during operation or stop is higher than the above antifreeze operation temperature. The water supply unit according to claim 6, wherein the intermittent operation is stopped when the freeze prevention operation stop temperature is set higher than the high temperature. The electrical component has an inverter that performs constant discharge pressure control,
When the water temperature detected while the pump is stopped falls below a predetermined antifreeze operation temperature, the pump is operated at a low speed operation lower than the rated value, and the water temperature detected during operation is the antifreeze operation temperature. When the temperature is higher than the set anti-freezing operation stop temperature, the pump is stopped, and when the discharge pressure is lower than the start pressure, the operation is shifted to the normal discharge pressure constant control operation. The water supply unit according to claim 6.   11. The water supply unit according to claim 10, wherein when the reference water temperature is higher than 40 ° C., the electrical unit performs variable speed operation by reducing the discharge pressure or the maximum rotation speed. A temperature sensor is disposed in the vicinity of the magnetic sensor,
5. The water supply unit according to claim 4, wherein voltage outputs of the pressure sensor, the magnetic sensor, and the temperature sensor are digitized and digital communication is performed with the electrical component.