JP2018168773A - Adjustment method for water supply unit - Google Patents

Abstract

To provide an adjustment method for a water supply unit capable of easily and appropriately adjusting a pressure regulating valve, and the water supply unit.SOLUTION: A water supply unit comprises: a pump part including a pump casing; a jet part including a suction path communicating to a suction side of the pump part, a return path communicating from the inside of the pump casing to the suction path and a nozzle; a pressure regulating valve which is provided in the pump part and regulates distribution of a return flow to be sent to the return path and a discharge flow to be sent to a secondary side of the pump part; and a pressure detection part which detects and displays a pressure at the suction side of the pump part. In accordance with an adjustment method for the water supply unit, in a state where one or more faucets provided at a secondary side of a discharge port are opened all, the pressure regulating valve is adjusted so as to meet such a condition that a suction head is settled within a predetermined range.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for adjusting a water supply unit and a water supply unit.

  Water supply units used for well water pumping are for shallow wells with uplift heads up to -7 m and for deep wells with uplift heads of about -7 m to -35 m. In addition, as a shallow and deep model, for example, a water supply unit including a so-called jet pump in which a turbine pump is used in a pump unit and a jet nozzle is provided on a suction side is used (see, for example, Patent Document 1). The jet pump is, for example, a turbine pump unit directly connected to a brushless motor, a pressure sensor, a flow rate sensor, an electrical component having an inverter function, a check valve for automatic operation, an accumulator, an automatic pressure adjustment valve, The base which mounts these and the pump cover which covers these are provided.

  Such a water supply unit controls the operation of the pump by constant discharge pressure control, and stops the pump when the flow sensor detects a stop flow rate or less, for example, by closing the faucet at the water supply end.

  The well depth in which such a shallow and deep water supply unit is used varies, for example, from a suction head of -7 m to -35 m. In general, when a product is shipped, in order to facilitate shipping adjustment, the automatic pressure control valve is set weakly so as to open at a low pressure corresponding to a shallow well having a small suction head. Therefore, in the case of a deep well with a large wicking height, it must be strongly reset so that it opens at high pressure. For example, when the water supply unit is used in a deep well, in order to reduce the discharge pressure, the water faucet on the discharge side is opened in advance and the adjustment screw is tightened once. Then, turn on the water supply unit and operate it. Loosen the adjustment screw of the automatic pressure adjustment valve using the pressure value in the manufacturer's instruction manual as a guide while checking the pressure gauge that has completed pumping. Adjust to position.

JP 2011-149409 A

  However, in the adjustment based on the stream sound, the adjustment reference is ambiguous and it is difficult to adjust accurately. Therefore, it may be used without adjusting the automatic pressure control valve as the initial setting for the shallow well, or with the adjustment screw tightened to avoid unpumping at a large flow rate. .

  However, in the case of no adjustment, there is a risk that the flow rate is reduced due to the occurrence of cavitation and pumping becomes impossible. On the other hand, when the adjusting screw is tightened excessively, a wasteful water flow is sent to the return pipe, so that only a small flow rate can be supplied with the same power consumption, resulting in a decrease in overall efficiency.

  Therefore, there is a need for a water supply unit adjustment method and a water supply unit that can adjust the pressure adjustment valve easily and appropriately.

  A method for adjusting a water supply unit according to an aspect of the present invention includes a pump part having a pump casing, a suction path communicating with the suction side of the pump part, a return path communicating with the suction path from the inside of the pump casing, A jet section having a nozzle, a pressure adjusting valve provided in the pump section, for adjusting distribution of a return flow sent to the return path and a discharge flow sent to the secondary side of the pump section, and the pump section The suction head is within a predetermined range in a state where all of one or more water taps provided on the secondary side of the discharge port are opened in a water supply unit including a pressure detection unit that detects and displays the pressure on the suction side The pressure regulating valve is adjusted so as to satisfy the condition.

  ADVANTAGE OF THE INVENTION According to this invention, the adjustment method and water supply unit of a water supply unit which can adjust a pressure control valve easily and appropriately can be provided.

Explanatory drawing which shows the structure of the water supply unit concerning one Embodiment of this invention. The side view of the pump apparatus of the water supply unit. The top view of the pump apparatus. Sectional drawing of the pump part of the pump apparatus. Sectional drawing which shows the structure of the jet part concerning the embodiment. Explanatory drawing which shows the adjustment reference | standard table of the pressure control valve of the pump apparatus. The graph which shows the relationship between the suction lift and discharge amount of the pump apparatus. The graph which shows the adjustment reference | standard of the same pressure regulating valve. The graph which shows the characteristic of the pump apparatus concerning the embodiment. The graph which shows the characteristic of the pump apparatus concerning the embodiment.

  Hereinafter, the water supply unit 1 concerning one Embodiment of this invention is demonstrated with reference to FIG. 1 thru | or FIG. Drawing 1 is an explanatory view showing the composition of the water supply unit concerning this embodiment. 2 and 3 are a side view and a plan view of the pump device, in which the cover is cut away to show the internal structure, and a partial structure is shown in cross section. FIG. 4 is a cross-sectional view of the pump unit 11. In each figure, for the sake of explanation, the configuration is schematically shown with enlargement, reduction, or omission as appropriate. In the figure, arrows X, Y and Z indicate three directions orthogonal to each other.

  A water supply unit 1 shown in FIG. 1 includes a pump device 10 and a jet unit 50 connected to the pump unit 11 of the pump device 10. The water supply unit 1 is a jet type water supply device that sucks water from a water storage part B such as a well and discharges it to a predetermined water supply part T, and can be applied to both a shallow well and a deep well.

  As shown in FIGS. 1 to 4, the pump device 10 includes a pump unit 11, a motor 12, an accumulator 13, and an electrical unit 14, which are installed on a base unit 15, and are further connected by a pump cover 16. Covered and composed.

  The pump unit 11 is a centrifugal pump having a pump casing 24 and an impeller 25 disposed in the casing 24.

  The casing 24 has a suction port 24a, a discharge port 24b, and a return port 24c, a pump chamber 24d in which an impeller 25 is disposed, a suction chamber 24e extending from the suction port 24a to the pump chamber 24d, and a pump chamber 24d. And a discharge chamber 24f extending from the discharge port 24b to a discharge port 24b.

  The casing 24 has an upper wall 24g disposed at the top, a partition wall 24h disposed below the upper wall 24g and partitioning the discharge chamber 24f and the pump chamber 24d, and a discharge chamber 24f above and outside the partition wall 24h. A discharge pipe 24i is formed integrally.

  The suction port 24 a and the return port 24 c are disposed adjacent to each other on one side of the casing 24.

  The return port 24c communicates with the pump chamber 24d. A return flange 56a is attached to the return port 24c, and a return pipe 56 is connected thereto.

  A suction flange 57a is attached to the suction port 24a, and a suction pipe 57 is connected thereto. The suction flange 57a is provided with a suction pressure sensor 44 as a suction pressure detection unit for detecting and displaying the suction head on the primary side of the pump unit 11.

  The discharge port 24b is provided at an end of a discharge pipe 24i that forms a discharge chamber 24f disposed outside the pump chamber 24d. In the casing 24, the discharge port 24b is arranged on a side surface different from the suction port 24a and the return port 24c. The discharge port 24b is connected to a discharge pipe, and is connected to a plurality of water supply units T via the discharge pipe.

  The upper wall 24g has a water injection opening 24j for priming water. The opening 24j is provided with a plug and a cap 32 for opening and closing the opening 24j.

  A valve port 24k for automatic pressure adjustment is formed in the partition wall 24h. The valve port 24k is provided with an automatic pressure adjusting valve 34 (pressure adjusting valve) for adjusting the open / closed state of the valve port 24k.

  The valve port 24k communicates with the discharge port 24b through the discharge chamber 24f and also with the return port 24c. Accordingly, the valve port 24k communicates with the jet unit 50 via the return pipe 56 connected to the return port 24c.

  A discharge pipe 24i that forms a discharge chamber 24f is provided outside the partition wall 24h. It is arranged on the secondary side of the valve port 24k, extends downward on the side of the automatic pressure regulating valve 34, and reaches a discharge port 24b disposed at the lower part of the pump unit 11. The discharge pipe 24i is introduced into a predetermined water supply unit T.

  The automatic pressure regulating valve 34 is provided with a diaphragm 36 which is a bottomed cylindrical opening / closing valve made of an elastic body and constitutes a valve body 39, and a spring 37 is provided in the diaphragm 36, and the spring 36 causes the diaphragm 36 to be a valve. It is elastically biased downward so as to close the mouth 24k. A screw 38 for adjusting the elastic force of the spring 37 is provided above the diaphragm 36.

  The valve port 24k is closed by the diaphragm 36 when stopped. When the impeller 25 of the pump unit 11 is activated and the pressure of water in the pump unit 11 increases, the diaphragm 36 is pushed upward against the elastic force of the spring 37 by the pressure, and the valve body 39 is opened. When the valve body 39 is opened, the water in the pump unit 11 is divided into the amount that flows from the valve port 24k to the discharge port 24b through the discharge pipe 24i and the amount that flows from the return port 24c to the jet unit 50 through the return pipe 56. It has become.

  The automatic pressure adjusting valve 34 is configured to adjust the pressure at the time of opening by adjusting the elastic force of the spring by rotating a screw, and to adjust the flow distribution. For example, when there is a need to increase the return flow rate, such as when the reservoir is a deep well, it is set to open at a high pressure. For example, when the return flow rate may be small, such as when the reservoir is a shallow well, it is low. Set to open with pressure.

  A sensor opening 24l is formed at a predetermined location of the discharge pipe 24i on the secondary side of the valve port 24k. A sensor unit 40 is provided in the sensor opening 24l.

  The sensor unit 40 is attached to a sensor body 41 provided in the sensor opening 24l, a discharge pressure sensor 42 as a discharge pressure detection part attached to a hole 41a of the sensor body 41, and an attachment part 41b of the sensor body 41. A flow rate sensor 43 serving as a flow rate detection unit and a sensor cover 46 covering these sensors are provided.

  The sensor body 41 is a plate-like member that covers the sensor opening 24l, and is formed with a hole 41a and a mounting portion 41b as a mounting structure for various sensors, for example, by resin molding. The sensor body 41 is assembled, for example, at the periphery thereof to the outer periphery of the sensor opening 24l by a fastening member.

  The discharge pressure sensor 42 is, for example, a semiconductor-type pressure sensor using a piezo effect, and includes a diaphragm provided in the hole 41a of the sensor body 41, a strain gauge provided on the upper portion of the diaphragm, a diaphragm, and a strain gauge. And a non-corrosive liquid such as silicon oil filled in the liquid chamber.

  The discharge pressure sensor 42 is configured to detect the pressure in the discharge pipe 24i and output an analog voltage. When the diaphragm changes due to the pressure in the discharge pipe 24i, the discharge pressure sensor 42 applies pressure to the strain gauge by silicon oil in the liquid chamber, and converts the strain amount of the strain gauge according to the pressure into a signal. The pressure is detected. The discharge pressure sensor 42 is connected to the electrical component 14 via a signal line, and transmits the detected pressure signal to the electrical component 14.

  The flow sensor 43 is, for example, a paddle type flow sensor, and is rotatably supported by the bearing 43a supported by the mounting portion 41b of the sensor body 41, the paddle shaft 43b supported by the bearing 43a, and the paddle shaft 43b. A paddle 43c, a magnet 43d built in the paddle 43c, and a magnetic sensor 43e are provided. The magnetic sensor 43e is disposed on the upper part of the sensor body 41. This is a linear output type magnetic sensor that detects the magnetic flux of the magnet 43d and outputs a voltage proportional to the magnetic flux. The magnetic sensor 43e includes a high-sensitivity Hall element, is configured to detect a magnetic flux density and output an analog voltage. The magnetic sensor 43e is connected to the electrical component 14 via a signal line.

  The suction pressure sensor 44 is, for example, a vacuum gauge, and is disposed on the primary side of the pump unit, that is, on the suction side. The suction pressure sensor 44 is provided with a meter that displays the suction head so that the user can visually recognize the suction head.

The impeller 25 is connected to the output shaft of the motor 12 and is driven to rotate.
One end of the return pipe 56 is connected to the return port 24 c of the pump device 10, extends from the return port 24 c to a predetermined position above the well, bends downward, and the other end is the primary side of the nozzle 53 of the jet unit 50. Is connected to the return connecting pipe 54. The return pipe 56 forms a return path from the return port 24 c to the primary side of the nozzle 53.

One end of the suction pipe 57 is connected to the suction connection pipe 51 on the secondary side of the nozzle 53 of the jet unit 50, extends upward and bends on the ground, and the other end is connected to the suction port 24 a of the pump device 10. . The suction pipe 57 forms a suction path from the secondary side of the nozzle 53 to the suction port 24a.
The return pipe 56 and the suction pipe 57 are adjacent to each other in the well and extend vertically in parallel, and are fastened with a band at a predetermined position.

  The electrical unit 14 includes a storage device as a storage unit that stores various information, a control unit, an inverter connected to each pump, a display unit 14a, an input unit, and an electrical box 14b that accommodates these. Prepare.

  For example, the storage device stores various programs, various reference values, and threshold values as information necessary for control.

  The control unit controls the operation of the pump device 10 according to various programs stored in advance in the storage device. Specifically, a control part transmits a control signal to each inverter, and controls an inverter. For example, the control unit performs various arithmetic processes based on the detection values detected by the sensors 42 and 43, and shifts or stops the motor of the pump device by frequency control of the inverter.

  The inverter is electrically connected to the motor 12 of the pump device 10 by a signal line. The inverter outputs a predetermined frequency according to a control signal from the control unit, thereby rotating the motor 12 of the pump device 10 at a predetermined rotation speed. Specifically, the control unit controls the estimated terminal pressure to be constant so that the discharge pressure becomes the target pressure value.

  The display unit 14a includes, for example, a display, and displays the discharge flow rate detected by the flow sensor and the discharge pressure detected by the pressure sensor. The display unit 14a is disposed on the upper surface of the electrical box 14b, for example. The user can manually adjust the automatic pressure regulating valve 34 while visually observing the display on the display unit 14a.

  As shown in FIGS. 2 and 4, the jet section 50 includes a suction connection pipe 51, a diffuser 52 disposed in the suction connection pipe 51, a nozzle 53 disposed to face the diffuser 52, and a return connection. A pipe 54 and a supply pipe 55 having a supply port 55a communicating with the well water are provided. For example, the jet unit 50 is disposed at a predetermined position above the bottom surface of the well by a predetermined distance and is disposed below the installation surface of the pump device 10.

  The suction connection pipe 51 extends in the vertical direction, and the upper end portion is connected to the suction port 24 a via the suction pipe 57. The primary side of the suction connecting pipe 51 communicates with the return connecting pipe 54 and also communicates with the supply pipe 55.

  The diffuser 52 is disposed in the suction connection pipe 51.

  The nozzle 53 is disposed in the suction connection pipe 51 so as to face the diffuser 52.

  The return connecting pipe 54 is connected to the return pipe 56. The upper end of the return connecting pipe 54 is connected to the return port 24 c via the return pipe 56. The return connecting pipe 54 is bent downward and joins the side of the suction connecting pipe 51. A nozzle 53 is provided on the secondary side of the return connection pipe 54, and the suction connection pipe is 51.

  The supply pipe 55 has a supply port 55a that communicates with one end of the well as a water storage section. The other end side of the supply pipe 55 communicates with the suction connection pipe 51. A strainer 58 is provided at the supply port 55 a of the supply pipe 55.

  In the water supply unit 1 configured as described above, a self-priming operation for shifting from the start to the pumping operation and a pumping operation that is a normal operation are performed.

  For example, the water supply unit 1 controls the operation of the pump with the constant discharge pressure control in the pumping operation after the self-sustained operation, and when the flow sensor detects a flow rate below the stop flow rate by closing the faucet at the water supply end, Stop.

  In the pumping operation after the self-sufficiency operation, the impeller 25 is driven by the motor 12 and rotates inside the pump unit 11, thereby rotating the supply port of the jet unit 50 together with water returning from the return pipe 56 as indicated by an arrow in the figure. Well water pumped up from 55a is sequentially sucked from the suction connecting pipe 51 into the suction chamber 24e in the pump section 11.

  The water sucked into the suction chamber 24e is sent to the discharge chamber 24f from the suction chamber 24e by the rotation of the impeller 25, and is sent to the discharge pipe 24i by the automatic pressure regulating valve 34 and to the return pipe 56. Divide.

  The water sent to the return pipe 56 is sent to the nozzle 53 and further jetted as high-pressure water from the nozzle 53 toward the diffuser 52.

  On the other hand, the water sent to the discharge pipe 24i is sent to the discharge port 24b as indicated by an arrow in the figure, and is guided to the plurality of water supply units T by the discharge pipes connected to the discharge port 24b.

  The water supply unit 1 according to the present embodiment can be adjusted by two adjustment methods. The 1st adjustment method of the water supply unit 1 is demonstrated. The first adjustment method is performed, for example, after the pumping is completed by the self-contained operation process. The first adjustment method of the water supply unit 1 is to open the faucets of all of the water supply units T provided to allow the maximum flow rate to flow, and the suction lift by the suction pressure sensor 44 that is a vacuum pressure gauge. The automatic pressure adjustment valve 34 is manually adjusted so that the suction head is in the range of Δ7 to 8 m.

  Next, the 2nd adjustment method of the water supply unit 1 concerning this embodiment is demonstrated. The second adjustment method is performed after completion of pumping, for example, by self-sufficiency processing. The second adjustment method of the water supply unit 1 is to open at least one arbitrary water tap of all the water supply units T so as to allow an arbitrary flow rate to flow, and to use a vacuum pressure gauge and a display unit to Manually adjusting the automatic pressure regulating valve 34 so that the relationship between the suction head and the flow rate satisfies a predetermined condition while checking the flow rate.

  Specifically, for example, as shown in FIGS. 5 and 6, the user manually adjusts the automatic pressure adjusting valve 34 so as to satisfy a predetermined condition using a preset correspondence as an index.

  FIG. 5 is a correspondence table between the discharge flow rate and the suction lift, and is set to satisfy the condition that the suction lift at the maximum flow rate is in the range of Δ7 to 8 m, for example. The user confirms the flow rate by viewing the display unit 14a, and adjusts the automatic pressure adjustment valve 34 with reference to the correspondence table while visually confirming the suction head by visually checking the meter of the suction pressure sensor 44, thereby obtaining a desired value. The tightening amount can be defined. In this case, even when there are a plurality of water supply units T, the setting can be performed by opening a faucet of an arbitrary water supply unit T in the vicinity, so that the adjustment work is easy.

FIG. 6 is a table of measured data showing the correspondence between the discharge flow rate Q and the suction lift h, and FIG. 7 is a graph showing the correspondence between the discharge flow rate Q and the suction lift h. For example, the calculation formula h = 0.36Q + 0.1 is obtained from this table.
FIG. 8 is a graph showing the correspondence between the discharge flow rate Q of the flow rate sensor and the output voltage V. In the region where the flow rate is 12 L / min or less and the output voltage is 3.8 V or less, the flow rate Q = 11.4 V−. 29.3. In the region where the flow rate is 12 L / min or more and the output voltage is 3.8 V or more, the flow rate Q is 5.1 V−6.4. The user confirms the flow rate by looking at the display unit 14a, and adjusts the automatic pressure adjustment valve 34 so as to satisfy the calculation formula of the graph while confirming the suction head with the meter of the suction pressure sensor 44, thereby achieving a desired tightening. You can define the amount. In this case, even when there are a plurality of water supply units T, the setting can be performed by opening a faucet of an arbitrary water supply unit T in the vicinity, so that the adjustment work is easy.

  According to the water supply unit 1 configured as described above, by setting the automatic pressure adjustment valve 34 so that the suction head is in a predetermined range, it is possible to prevent a decrease in flow rate due to the occurrence of cavitation and inability to pump, and to improve the overall efficiency. Can be improved.

  FIG. 9 is a graph showing characteristics of the pump device 10 at a plurality of suction heads as a comparative example. FIG. 10 shows a pump device when the automatic pressure control valve 34 is adjusted so that the conditions of the table of FIG. 6 and the graphs of FIGS. 7 and 8 are satisfied, that is, the suction lift at the maximum flow rate is Δ7 to 8 m. 10 is a graph showing 10 characteristics. 9 and 10, by adjusting the automatic pressure control valve 34 so that the suction head becomes Δ7 m to 8 m, it is possible to increase the maximum total efficiency to 17.1% by making the suction head Δ8 m. It turns out that it becomes. For this reason, it is possible to prevent a decrease in the flow rate due to the occurrence of cavitation and inability to pump, and improve the overall efficiency.

  Accordingly, the water supply unit 1 can be adjusted accurately as compared with an adjustment method using an ambiguous reference such as a stream sound, and a desirable setting can be easily realized.

  In addition, since the setting reference is simpler than the adjustment method based on the pressure on the discharge side that is changed according to the diameter and various conditions, the adjustment work is easy.

As a result, proper processing is facilitated, and the adjustment screw is tightened to avoid the need to re-adjust the automatic pressure control valve as the default setting for shallow wells or to prevent pumping at high flow rates. It is possible to prevent the use of the product while it is in the middle.
Further, the vacuum gauge as the suction pressure sensor becomes unnecessary after the adjustment of the automatic pressure control valve is completed, and may be removed to prevent freezing.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage.

For example, as another embodiment, the suction pressure sensor 44 may be a semiconductor pressure sensor, connected to the suction flange, and the suction head may be displayed on the electrical component.
Thereby, since the suction pressure can be displayed at all times, it is possible to re-adjust the automatic pressure regulating valve by measuring the change in the lifting height of the well due to the season.

  Furthermore, the present invention can be realized even if some of the constituent features of the above-described embodiment are omitted.

DESCRIPTION OF SYMBOLS 1 ... Water supply unit, 10 ... Pump apparatus, 11 ... Pump part, 12 ... Motor, 13 ... Accumulator, 14 ... Electrical equipment part, 14a ... Display part, 14b ... Electrical equipment box, 15 ... Base part, 16 ... Pump cover, 24 ... Casing, 24a ... suction port, 24b ... discharge port, 24c ... return port, 24d ... pump chamber, 24e ... suction chamber, 24f ... discharge chamber, 24g ... upper wall, 24h ... partition wall, 24i ... discharge pipe, 24j ... opening, 24k ... Valve port, 24l ... Sensor opening, 25 ... Impeller, 32 ... Cap, 34 ... Automatic pressure regulating valve (pressure regulating valve), 36 ... Diaphragm, 37 ... Spring, 38 ... Screw, 39 ... Valve body, 40 ... Sensor Unit: 40a ... Opening, 41 ... Sensor body, 41a ... Hole, 41b ... Mounting part, 42 ... Discharge pressure sensor, 43 ... Flow sensor, 43a ... Bearing, 43b ... Paddle shaft, 4 c ... Paddle, 43d ... Magnet, 43e ... Magnetic sensor, 44 ... Suction pressure sensor, 46 ... Sensor cover, 50 ... Jet section, 51 ... Suction connection pipe, 52 ... Diffuser, 53 ... Nozzle, 54 ... Return connection pipe, 55 ... Supply pipe, 55a ... Supply port, 56 ... Return pipe, 56a ... Return flange, 57 ... Suction pipe, 57a ... Suction flange, 58 ... Strainer.

A water supply unit adjustment method according to an aspect of the present invention comprises a pump chamber, a suction port, a discharge port, and a return port that communicate with the pump chamber, and a valve port that communicates with the discharge port and the return port. A pump casing having an impeller disposed in the pump chamber, a suction path communicating with the suction side of the pump section, a return path communicating with the suction path from the return port, A jet section having a nozzle, and is opened and closed according to the pressure of the pump section, and the liquid of the pump section is discharged through the discharge flow toward the discharge port and the return path of the nozzle. A pressure regulating valve with an on-off valve that diverts to a return flow toward the primary side, a suction pressure detection unit that detects and displays the pressure on the suction side of the pump unit, and a flow rate on the discharge side of the pump unit Flow rate detection And at least one of the one or more faucets provided on the secondary side of the discharge port of a water supply unit comprising a display unit that displays the detected flow rate on the discharge side, and flows an arbitrary flow rate. In this state, the pressure regulating valve is adjusted so that the relationship between the flow rate on the discharge side and the pressure on the suction side satisfies a condition that falls within a predetermined range.

Furthermore, the present invention can be realized even if some of the constituent features of the above-described embodiment are omitted.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
(1)
A pump casing having a suction port, a discharge port, and a return port; and an impeller disposed in the pump casing;
A jet section having a suction path communicating with the suction side of the pump section, a return path communicating with the suction path from the return port, and a nozzle;
A pressure adjusting valve that is provided in the pump unit and adjusts the distribution of the return flow sent to the return path and the discharge flow sent to the secondary side of the pump unit;
A pressure detection unit for detecting and displaying the pressure on the suction side of the pump unit;
A water supply unit comprising: a water supply unit that adjusts the pressure control valve so that a suction lift is in a predetermined range in a state where one or more faucets provided on the secondary side of the discharge port are all opened. How to adjust the unit.
(2)
A pump casing that constitutes the pump chamber, and has a suction port, a discharge port, and a return port that communicate with the pump chamber, and a valve port that communicates with the discharge port and the return port, and is disposed in the pump chamber An impeller, and a pump part having
A jet section having a suction path communicating with the suction side of the pump section, a return path communicating with the suction path from the return port, and a nozzle;
It is arranged at the valve port, opens and closes according to the pressure of the pump unit, and splits the liquid of the pump unit into a discharge flow toward the discharge port and a return flow toward the primary side of the nozzle via the return path A pressure regulating valve comprising an on-off valve,
A suction pressure detection unit for detecting and displaying the pressure on the suction side of the pump unit;
A flow rate detection unit for detecting a flow rate on the discharge side of the pump unit;
A display unit for displaying the detected flow rate on the discharge side;
In the state where at least one of the one or more faucets provided on the secondary side of the discharge port is opened and an arbitrary flow rate is allowed to flow, the relationship between the flow rate on the discharge side and the pressure on the suction side However, the adjustment method of the water supply unit which adjusts the said pressure regulating valve so that the conditions which become a predetermined range may be adjusted.
(3)
The method for adjusting a water supply unit according to (1) or (2), wherein the pressure adjusting valve is adjusted so that a suction head at a maximum flow rate is Δ7 m to 8 m.
(4)
The flow rate detection unit includes a paddle disposed on the secondary side of the pressure regulating valve, a sensor body including a bearing that supports a shaft connected to the paddle, a magnet mounted on the paddle, and a sensor body. The adjustment method of the water supply unit of Claim 2 provided with the linear output type magnetic sensor which is arrange | positioned at the upper part and detects the magnetic flux of the said magnet, and outputs the voltage proportional to the said magnetic flux.
(5)
A pump section having a pump casing;
A jet section having a suction path communicating with the suction side of the pump section, a return path communicating with the suction path from the inside of the pump casing, and a nozzle;
A pressure adjusting valve that is provided in the pump unit and adjusts the distribution of the return flow sent to the return path and the discharge flow sent to the secondary side of the pump unit;
A pressure detection unit for detecting and displaying the pressure on the suction side of the pump unit;
With
The water supply unit, wherein the pressure adjusting valve is adjusted so as to satisfy a condition that a suction head is in a range of Δ7 m to 8 m in a state where one or more faucets provided on the secondary side of the discharge port are opened.

Claims (5)

A pump casing having a suction port, a discharge port, and a return port; and an impeller disposed in the pump casing;
A jet section having a suction path communicating with the suction side of the pump section, a return path communicating with the suction path from the return port, and a nozzle;
A pressure adjusting valve that is provided in the pump unit and adjusts the distribution of the return flow sent to the return path and the discharge flow sent to the secondary side of the pump unit;
A pressure detection unit for detecting and displaying the pressure on the suction side of the pump unit;
A water supply unit comprising: a water supply unit that adjusts the pressure control valve so that a suction lift is in a predetermined range in a state where one or more faucets provided on the secondary side of the discharge port are all opened. How to adjust the unit. A pump casing that constitutes the pump chamber, and has a suction port, a discharge port, and a return port that communicate with the pump chamber, and a valve port that communicates with the discharge port and the return port, and is disposed in the pump chamber An impeller, and a pump part having
A jet section having a suction path communicating with the suction side of the pump section, a return path communicating with the suction path from the return port, and a nozzle;
It is arranged at the valve port, opens and closes according to the pressure of the pump unit, and splits the liquid of the pump unit into a discharge flow toward the discharge port and a return flow toward the primary side of the nozzle via the return path A pressure regulating valve comprising an on-off valve,
A suction pressure detection unit for detecting and displaying the pressure on the suction side of the pump unit;
A flow rate detection unit for detecting a flow rate on the discharge side of the pump unit;
A display unit for displaying the detected flow rate on the discharge side;
In the state where at least one of the one or more faucets provided on the secondary side of the discharge port is opened and an arbitrary flow rate is allowed to flow, the relationship between the flow rate on the discharge side and the pressure on the suction side However, the adjustment method of the water supply unit which adjusts the said pressure regulating valve so that the conditions which become a predetermined range may be adjusted.   The adjustment method of the water supply unit of Claim 1 or 2 which adjusts the said pressure regulating valve so that the suction lift at the time of a maximum flow volume may be set to (DELTA) 7m-8m.   The flow rate detection unit includes a paddle disposed on the secondary side of the pressure regulating valve, a sensor body including a bearing that supports a shaft connected to the paddle, a magnet mounted on the paddle, and a sensor body. The adjustment method of the water supply unit of Claim 2 provided with the linear output type magnetic sensor which is arrange | positioned at the upper part and detects the magnetic flux of the said magnet, and outputs the voltage proportional to the said magnetic flux. A pump section having a pump casing;
A jet section having a suction path communicating with the suction side of the pump section, a return path communicating with the suction path from the inside of the pump casing, and a nozzle;
A pressure adjusting valve that is provided in the pump unit and adjusts the distribution of the return flow sent to the return path and the discharge flow sent to the secondary side of the pump unit;
A pressure detection unit for detecting and displaying the pressure on the suction side of the pump unit;
With
The water supply unit, wherein the pressure adjusting valve is adjusted so as to satisfy a condition that a suction head is in a range of Δ7 m to 8 m in a state where one or more faucets provided on the secondary side of the discharge port are opened.