JP2016201072A - Water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply device capable of energy saving operation and preventing a decrease in detection precision of a flow rate.SOLUTION: A water supply device includes: a pump device having a pump and a motor; a connection pipe member 30 provided with a flow passage 5 from which water discharged from the pump flows out; an impeller 52 provided on the connection pipe member and having a plurality of blades for receiving water flowing inside the flow passage 5; a peripheral wall part provided on the connection pipe member to cover the impeller 52 more than 180 degrees in the rotational direction and formed with an opening which exposes a part of the blades inside the flow passage 5; a detection part 53 for detecting the number of rotations of the impeller 52; and a control panel for calculating a flow rate of the water based on a detection result of the detection part 53 and controlling the motor based on a calculation result.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a water supply apparatus.

In buildings such as buildings, a water supply device that supplies water to a faucet at the end is used. The water supply device includes a pump device, a pipe member that guides water discharged from the pump of the pump device to a faucet that is a terminal of a supply destination, a flow rate detection device provided in the pipe member, and a pressure detection provided in the pipe member And a device. (For example, refer to Patent Document 1.)
The pump device includes a pump, a motor that drives the pump, an inverter that controls the rotation speed of the motor, and a control unit that controls the inverter. A control part starts a motor, when the pressure in a pipe member becomes below starting pressure based on the detection result of a pressure detection apparatus. Further, the control unit stops driving the pump when the flow rate in the pipe member becomes equal to or lower than the stop flow rate based on the detection result of the flow rate detection device.

  A paddle type flow rate detection device is known as a flow rate detection device. The paddle type flow rate detection device includes a paddle that is rotatably supported by receiving water in the pipe member, and a signal output unit.

  The paddle is provided with a magnet inside. The paddle returns to the initial position when the flow rate in the pipe member is equal to or less than the stop flow rate.

  The signal output unit outputs a signal when the magnetic force of the paddle magnet is detected, and does not output a signal when the magnetic force is not detected.

  The magnetic force of the paddle magnet is within the detection range of the signal output unit when the paddle is in the initial position, and has a magnitude that deviates from the detection range of the signal output unit when the paddle rotates from the initial position. For this reason, the signal output unit stops outputting the signal when the paddle rotates from the initial position.

  When receiving a signal from the signal output unit, the control unit determines that the flow rate is equal to or less than the stop flow rate, and stops driving the pump.

  On the other hand, in the water supply apparatus, it is required to shorten the continuous operation time of the pump from the viewpoint of energy saving. In order to shorten the continuous operation of the pump, it is necessary to set the stop flow rate to a high value. However, in the paddle type flow rate detection device, the stop flow rate is determined by the shape of the paddle. For this reason, it is difficult to change the stop flow rate in the paddle type flow rate detection device.

On the other hand, an impeller-type flow rate detection device is known. The impeller-type flow rate detection device is installed in a pipe member and rotates by receiving the flow of water in the pipe member, and detects the rotational speed of the impeller, and a signal corresponding to the rotational speed of the impeller And a signal output unit for outputting. The number of rotations of the impeller varies depending on the flow rate in the pipe member. (For example, see Patent Document 2.)
In the case of using the impeller-type flow rate detection device, the control unit stops the driving of the pump when receiving a signal corresponding to the set stop flow rate. For this reason, in the impeller type flow rate detection device, the setting of the stop flow rate can be easily changed, so that the energy saving operation can be performed by setting the stop flow rate large.

JP-A-8-284871 Japanese Patent No. 3509946

  As described above, the water supply apparatus having the impeller-type flow rate detection device has the following problems. In other words, the impeller rotates in one direction in response to the flow of water, but depending on the installation position of the impeller, a flow is generated around the impeller that serves as resistance to rotation in this one direction.

  Thus, when the flow which becomes resistance of rotation of one direction generate | occur | produces, the rotation speed of an impeller type will become the value remove | deviated from the value according to the flow volume of the water in a pipe member. The detection accuracy of the flow rate detection device is reduced when the rotational speed of the impeller type becomes a value deviating from the value corresponding to the flow rate of water in the pipe member.

  An object of this invention is to provide the water supply apparatus which can perform the energy saving operation and can prevent the fall of the detection accuracy of flow volume.

  The water supply device of the present invention includes a pump device that includes a pump that boosts and discharges liquid, a motor that drives the pump, and a flow path unit that includes a flow path through which the liquid discharged from the pump flows. An impeller provided in the flow path section and provided with a plurality of blade portions for receiving the liquid flowing in the flow path; and provided in the flow path section to cover the impeller in a rotational direction by 180 degrees or more and A peripheral wall portion in which an opening exposing a part of the blade portion in the flow path is formed, a detection portion that detects the rotation speed of the impeller, and a flow rate of the liquid is calculated based on a detection result of the detection portion. And a control unit that controls the motor based on the calculation result.

  INDUSTRIAL APPLICABILITY The present invention can provide a water supply apparatus that can perform an energy saving operation and can prevent a decrease in flow rate detection accuracy.

Schematic which shows the water supply apparatus which concerns on the 1st Embodiment of this invention. The top view which shows a pair of connecting pipe member of the same water supply apparatus, a non-return valve apparatus, and a merging pipe member. Sectional drawing which cut | disconnects and shows one connection pipe member, one non-return valve apparatus, and a part of merging pipe member. A state where the second pipe portion of the connecting pipe member is cut along a cross section passing through the center line of the second pipe portion and perpendicular to the extension line of the center line of the first pipe portion of the connecting pipe member. FIG. Sectional drawing which shows the state which the said connection pipe member cut | disconnected along the cross section orthogonal to the centerline of the said 2nd pipe part. Sectional drawing of the same connecting pipe member shown along the F6-F6 line cross section shown by FIG. The top view which partially cuts and shows the connection pipe member of the water supply apparatus which concerns on the 2nd Embodiment of this invention, a flow volume detection apparatus, a non-return valve apparatus, and a merging pipe member.

  The water supply apparatus 10 which concerns on one Embodiment of this invention is demonstrated using FIG. FIG. 1 is a schematic view showing a water supply device 10. As shown in FIG. 1, the water supply device 10 includes a pair of pump devices 20 and a connecting pipe member 30 that is provided for the pump 21 of each pump device 20 and is formed so that water discharged from the pump 21 can flow. A flow rate detecting device 50 provided in the connecting pipe member 30, a check valve device 60 connected to each connecting pipe member 30, a merging pipe member 70 connected to both check valve devices 60, and a merging Operations of the piping member 80 connected to the pipe member 70 to guide water to, for example, a faucet, the accumulator 90 connected to the merging pipe member 70, the pressure detection device 100 provided in the merging pipe member 70, and the pump device 20 And a control panel 110 configured to be able to control.

  Both pump devices 20 have the same structure. The pump device 20 includes a pump 21 configured to be able to increase and discharge water and a motor 22 configured to be able to drive the pump 21.

  FIG. 2 is a plan view showing the connecting pipe member 30, the check valve device 60, and the merging pipe member 70. FIG. 3 is a cross-sectional view showing one connecting pipe member 30, one check valve device 60, and a part of the joining pipe member 70. As shown in FIG. 3, the connecting pipe member 30 is formed in an L shape, and includes a first pipe part 31 and a second pipe part 32. The first pipe portion 31 is a portion on one side of the bent portion 33 of the connecting pipe member 30. The second pipe part 32 is the part on the other side across the bent part 33.

  One end of the first pipe portion 31 is connected to one end of the pump 21. The first pipe portion 31 communicates with the discharge port 23 of the pump 21. The first tube portion 31 has a circular cross-sectional shape and a shape that gradually decreases in diameter as it approaches the second connecting portion 42.

  FIG. 4 shows a state in which the second pipe portion 32 is cut along a cross section passing through the center line C2 of the second pipe portion 32 and perpendicular to the extension line of the center line C1 of the first pipe portion 31. It is sectional drawing. As shown in FIG. 4, a rectifying plate 34 is provided in the first pipe portion 31. The rectifying plate 34 is formed so as to divide the inside of the first pipe portion 31 into four flow path portions. Specifically, the rectifying plate 34 includes a first plate portion 34a and a second plate portion 34b. Both surfaces of the first plate portion 34a are planes parallel to each other. Both surfaces of the second plate portion 34b are planes parallel to each other. The second plate portion 34b is orthogonal to the first plate portion 34a.

  The rectifying plate 34 includes the first flow path portion S1, the second flow path portion S2, the third flow path portion S3, and the fourth flow path portion S4 in the first pipe portion 31. Forming. The flow path parts S1, S2, S3, S4 correspond to the respective quadrants when the first pipe part 31 is divided into four quadrants.

  Specifically, the first flow path part S <b> 1 is formed in one of the four quadrants in the first pipe part 31. The second flow path part S <b> 2 is formed in one of the remaining three quadrants in the first pipe part 31. The third flow path part S3 is formed in one of the remaining two quadrants in the first pipe part 31. The fourth flow path portion S4 is formed in the remaining quadrant. The flow path sections S1, S2, S3, and S4 have the same flow path cross-sectional area.

  The second pipe part 32 extends in a direction orthogonal to the direction in which the first pipe part 31 extends. Specifically, the second pipe portion 32 extends in a direction orthogonal to the second plate portion 34b. FIG. 5 is a cross-sectional view showing a state where the second pipe portion 32 is cut along a cross section orthogonal to the center line C <b> 2 of the second pipe portion 32. As shown in FIGS. 4 and 5, the cross-sectional shape of the second pipe portion 32 is substantially circular.

  FIG. 6 is a cross-sectional view of the connecting pipe member 30 shown along the cross section F6-F6 shown in FIG. FIG. 6 is a cross-sectional view showing a state in which the connecting pipe member 30 is cut along a cross section passing through the center line C2 shown in FIG. 5 and orthogonal to the second plate portion 34b. As shown in FIGS. 5 and 6, a housing portion 35 is formed in the second pipe portion 32. The accommodating part 35 is formed so as to accommodate an impeller 52 to be operated after the flow rate detecting device 50. The accommodating part 35 has a peripheral wall part 36, a bottom wall part 37, and a lid member 38.

  The peripheral wall portion 36 is a part of the peripheral wall portion of the second pipe portion 32. Specifically, the peripheral wall portion 36 pipes any one of the four flow path portions S1, S2, S3, and S4 of the first pipe portion 31 among the peripheral wall portions of the second pipe portion 32. It is provided at a portion extending in the direction of water flow along the inner surface of the member 80.

  In the present embodiment, as an example, the peripheral wall portion 36 is provided in a portion that extends the third flow path portion S3 of the first pipe portion 31 along the inner surface of the piping member 80 in the direction in which water flows.

  Here, a cross section orthogonal to the center line of the second pipe portion 32 is divided into four quadrants. The four quadrants are defined by a first virtual plane V1 that is orthogonal to the center line C1 of the first pipe portion 31 and a second virtual plane V2 that is orthogonal to the first virtual plane V1. In FIG. 5, the upper left quadrant is the first quadrant Q1, the lower left quadrant is the second quadrant Q2, the upper right quadrant is the third quadrant Q3, and the lower right quadrant is the fourth quadrant Q4. .

  The first quadrant Q1 is disposed at a position where the first flow path portion S1 extends along the inner surface of the connecting pipe member 30, and corresponds to the first flow path portion S1. The second quadrant Q2 is disposed at a position where the second flow path portion S2 extends along the inner surface of the connecting pipe member 30, and corresponds to the second flow path portion S2. The third quadrant Q3 is disposed at a position where the third flow path portion S3 extends along the inner surface of the connecting pipe member 30, and corresponds to the third flow path portion S3. The fourth quadrant Q4 is disposed at a position where the fourth flow path portion S4 extends along the inner surface of the connecting pipe member 30, and corresponds to the fourth flow path portion S4.

  For this reason, as shown in FIG. 5, the surrounding wall part 36 is located in the 3rd quadrant Q3 at the time of dividing the cross section of the 2nd pipe part 32 into four quadrants.

  The peripheral wall portion 36 protrudes radially outward with respect to a portion other than the peripheral wall portion 36 of the peripheral wall portion of the second pipe portion 32. An inner surface 36a of the peripheral wall portion 36 is formed in a curved surface having a predetermined radius of curvature. In other words, the inner surface 36a has a curved surface shape that forms a part of a virtual cylinder having a predetermined radius.

  More specifically, the center line C3 of the imaginary cylinder of which the inner surface 36a forms a part is parallel to the center line C1 of the first pipe portion 31. As shown in FIG. 4, the center line C <b> 3 is disposed at a position offset outward with respect to the inner surface of the second pipe portion 32.

  For this reason, as shown in FIG. 4, the angle β formed by the upstream edge 36b of the inner surface 36a, the center line C3, and the downstream edge 36c of the inner surface 36a is less than 180 degrees. The peripheral wall portion 36 covers the space in the peripheral wall portion 36, in other words, the virtual cylinder with an angle range larger than 180 degrees around the center line C3. Between the upstream edge 36 b and the downstream edge 36 c, an opening 35 a that communicates the inside of the accommodating portion 35 with the inside of the connecting pipe member 30 is formed.

  The bottom wall portion 37 is connected to one end of the peripheral wall portion 36 and forms an end wall of the accommodating portion 35. One end of the accommodating portion 35 is closed by the bottom wall portion 37. The bottom wall portion 37 is formed in a circular shape having a radius having the same length as the radius of the virtual cylinder that forms part of the inner surface 36a, and is disposed at a position that is concentric with the center line C3. A bottom surface 37a facing the inside of the accommodating portion 35 in the bottom wall portion 37 is formed on a plane orthogonal to the second virtual plane V2.

  An opening 39 is formed in a portion of the second pipe portion 32 that faces the bottom wall portion 37 along the center line C3. The opening 39 is disposed at a position that is concentric with the center line C3. An internal thread is formed on the inner surface of the opening 39.

  The lid member 38 is detachably formed in the second pipe portion 32 so that the opening 39 can be opened and closed. Specifically, the lid member 38 is formed in a cylindrical shape, and a male screw that can be screwed into the opening 39 is formed on the peripheral surface. The lid member 38 is liquid-tightly fixed to the second pipe portion 32 by being screwed into the opening 39. The lid member 38 is formed so that the opening 39 can be liquid-tightly sealed. By rotating the lid member 38, the lid member 38 can be removed from the second pipe portion 32. The other end of the accommodating portion 35 is closed by a lid member 38.

  The flow rate detection device 50 is provided in the second pipe portion 32. The flow rate detection device 50 detects the rotation of the rotating shaft 51 provided in the accommodating portion 35, the impeller 52 provided rotatably on the rotating shaft 51, and the impeller 52, and responds to the rotation of the impeller 52. And a detection unit 53 configured to output the received signal.

  The rotation shaft 51 is fixed to the center of the bottom wall portion 37 and is parallel to the center line C3. The impeller 52 includes a cylindrical base portion 54 that can accommodate the rotation shaft 51 therein, and a plurality of blade portions 55 that are provided on the base portion 54 at regular intervals in the circumferential direction.

  The base 54 is formed with an accommodation hole 56 that can accommodate the rotation shaft 51. The diameter of the accommodation hole 56 is slightly larger than the rotation shaft 51. For this reason, the impeller 52 can rotate around the rotation shaft 51. A magnet 57 is embedded in an end portion of the base portion 54 on the lid member 38 side. The magnet 57 is disposed at a position eccentric with respect to the center line of the base portion 54.

  The length of the impeller 52 in the radial direction is set to a length that does not contact the inner surface 36a of the accommodating portion 35, in other words, a length that is separated from the inner surface 36a. Specifically, the length of the blade portion 55 in the radial direction is slightly shorter than the radius of the virtual cylinder that the inner surface 36a forms part of. For this reason, the blade | wing part 55 does not contact the inner surface 36a.

  As shown in FIGS. 5 and 6, the detection unit 53 is provided in the lid member 38. The detection unit 53 has a Hall IC 53a. The Hall IC 53a detects a magnetic flux caused by the magnet 57. The detection unit 53 outputs a signal corresponding to the detected magnetic flux, in other words, a signal corresponding to the rotation of the impeller 52.

  As shown in FIG. 3, the check valve device 60 includes a housing 61 connected to the second pipe portion 32 of the connecting pipe member 30, and a check valve 62 installed in the housing 61. Yes. The housing 61 communicates with a fifth flow path portion 63 formed so as to be able to communicate with the opening of the second pipe portion 32, and the fifth flow path portion 63. And a sixth flow path portion 64 having a large cross-sectional area.

  The check valve 62 is accommodated in the sixth flow path portion 64 and is formed so that the fifth flow path portion 63 can be opened and closed. Specifically, the check valve 62 is pressed against the edge of the opening so as to cover the opening of the fifth flow path portion 63 by the spring member 67. When the spring member 67 bends, the check valve 62 can move in the direction of opening the fifth flow path portion 63. As the check valve 62 moves, the fifth flow path portion 63 opens.

  As shown in FIG. 2, the joining pipe member 70 is connected to the housing 61 of one check valve device 60 and the housing 61 of the other check valve device 60. The junction pipe member 70 communicates with both housings 61.

  As described above, the connection from the pump 21 to the end is connected by the connecting pipe member 30, the joining pipe member 70, and the piping member 80. A flow path 5 is formed in the connecting pipe member 30 and the joining pipe member 70.

  As shown in FIG. 1, the pressure detection device 100 is configured to detect a pressure in the merging pipe member 70 and output a signal corresponding to the detected pressure. Note that the pressure in the junction pipe member 70 becomes the pressure in the flow path 5.

  The control panel 110 includes an inverter 111 that can control the current supplied to the motor 22 of the pump device 20 and a control unit 112 that controls the operation of the inverter 111. The control unit 112 is configured to be able to receive the output of the detection unit 53 of the flow rate detection device 50 and the output of the pressure detection device 100.

  In this embodiment, the control part 112 performs alternate operation control with respect to both the pump apparatuses 20 as an example. The alternating operation control is a control for stopping the driving of the other pump device 20 in a state where one pump device 20 is driven, and the one pump device 20 and the other pump device 20 are operated alternately. Control.

  Specifically, based on the detection result of the pressure detection device 100, the control unit 112 activates one pump device 20 when the pressure becomes equal to or lower than the activation pressure. At this time, the driving of the other pump device 20 is stopped. Moreover, the control part 112 will stop the drive of the pump apparatus 20 currently driven, if the detection result of the flow volume detection apparatus 50 becomes below a stop flow volume. After the one pump device 20 stops, when the pressure is again lower than the starting pressure, the motor 22 of the other pump device 20 is started next. At this time, the drive of one pump apparatus 20 stops. In this way, the control panel 110 activates the two pump devices 20 alternately.

  The stop flow rate can be arbitrarily changed. For example, the stop flow rate can be easily changed by a notebook computer for microcomputer software development of the control unit 112.

  Next, the operation of the water supply apparatus 10 will be described. When the faucet is opened while both the pump devices 20 are stopped, water in the flow path from the pump device 20 to the faucet is discharged from the faucet. By discharging water from the faucet, the pressure in the flow path decreases.

  When the detection result of the pressure detection device 100 becomes equal to or lower than the starting pressure, the control unit 112 of the control panel 110 controls the inverter 111 to start the motor 22 of one pump device 20. When the motor 22 of one pump device 20 is started, water is discharged from the pump 21. The discharged water flows through the connecting pipe member 30, the check valve device 60, the merging pipe member 70, and the piping member 80 in the order described.

  The inside of the first pipe portion 31 is divided into flow path portions S1, S2, S3, and S4 by a rectifying plate. The flow path cross-sectional areas of the flow path parts S1, S2, S3, S4 are equal. For this reason, the flow rate of the water flowing through each flow path part S1, S2, S3, S4 becomes substantially equal. The water that has flowed into the first pipe part 31 is rectified by flowing through the flow path parts S1, S2, S3, S4.

  The water that has flowed through the first pipe portion 31 flows into the second pipe portion 32. Specifically, the water that has flowed through the first flow path portion S <b> 1 flows into the first quadrant Q <b> 1 of the second pipe portion 32. The water that has flowed through the second flow path portion S2 flows into the second quadrant Q2 of the second pipe portion 32. The water that has flowed through the third flow path portion S3 flows into the third quadrant Q3 of the second pipe portion 32. The water that has flowed through the fourth flow path portion S4 flows into the fourth quadrant Q4 of the second pipe portion 32. As described above, the flow rates of water flowing through the flow path portions S1, S2, S3, and S4 are substantially equal. For this reason, the flow rate of water flowing into each quadrant Q1, Q2, Q3, Q4 is also substantially equal.

  The water flowing through the third quadrant Q <b> 3 rotates the impeller 52 by pushing a portion located in the flow path 5 in the blade portion 55 of the impeller 52. The impeller 52 is covered by the peripheral wall portion 36 over an angle range larger than 180 degrees in the rotation direction of the impeller 52.

  For this reason, the impeller 52 is exposed in the flow path of the second pipe portion 32 through the opening 35a only in the range of less than 180 degrees around the rotation shaft 51, so that the water flow in the second pipe portion 32 is exposed. Rotates the impeller 52 in only one direction.

  Further, since the bottom wall portion 37 is provided, it is possible to prevent the water flow from hitting the axial end portion of the impeller 52, and therefore, the rotation of the impeller 52 can be prevented from being hindered. Further, the bottom wall portion 37 prevents water from entering the housing portion 35 from the axial end portion side of the impeller 52.

  The impeller 52 rotates according to the flow rate. As the impeller 52 rotates, the magnet 57 fixed to the impeller 52 rotates. As the magnet 57 rotates, the detection unit 53 detects the rotation speed of the impeller 52. The detection unit 53 outputs the detection result to the control unit 112.

  The control unit 112 calculates the flow rate based on the detection result of the detection unit 53. When the flow rate becomes equal to or lower than the preset stop flow rate, the control unit 112 stops driving the motor 22 of the pump device 20 that is being driven.

  In a state where the driving of both pump devices 20 is stopped, the control unit 112 activates the motor 22 of the other pump device 20 with respect to the pump device 20 that was previously driven when the pressure is again lower than the activation pressure.

  In the water supply apparatus 10 configured as described above, the flow rate detection device 50 includes an impeller 52 that rotates at a rotational speed corresponding to the flow rate, and a detection unit 53 that outputs a signal corresponding to the rotational speed of the impeller 52. Have. Then, the control unit 112 calculates a flow rate based on the detection result of the detection unit 53 and compares the calculated flow rate with a preset stop flow rate to determine whether or not the flow rate is equal to or less than the stop flow rate. To do.

  In this way, the control unit 112 determines whether or not the flow rate is equal to or less than the stop flow rate by comparing the set stop flow value and the calculated actual flow rate. It is only necessary to input the value to the control unit 112. For this reason, since the stop flow rate can be changed easily, the water supply apparatus 10 can be operated in an energy-saving manner by setting the stop flow rate to a high value.

  Furthermore, when the impeller 52 is accommodated in the accommodating portion 35, only a range portion less than 180 degrees in the rotation direction of the vane portion 55 is exposed in the flow path 5. For this reason, impeller 52 comes to rotate when water hits a range portion of less than 180 degrees around rotation axis 51 in blade portion 55.

  Therefore, the water flow acts on the impeller 52 so as to rotate in one direction around the rotation axis, and the component of the flow that rotates in the opposite direction to this one direction acts on the impeller 52. It becomes difficult to do. For this reason, since the impeller 52 comes to rotate according to a flow volume, it can prevent that the detection accuracy of the flow volume detection apparatus 50 falls.

  Thus, the water supply apparatus 10 can perform energy-saving operation, and can prevent a decrease in flow rate detection accuracy.

  In addition, the control unit 112 calculates the flow rate based on the detection result of the detection unit 53, and based on the calculation result, the inverter 111 causes the motor 22 to increase the target pressure with an increase in the flow rate. May be.

  Further, since the accommodating portion 35 has the bottom wall portion 37, the axial end portion of the impeller 52 is covered with respect to the flow path 5. For this reason, it can prevent that a water flow strikes the axial direction edge part of the impeller 52. FIG. When a water flow hits the axial end of the impeller 52, the rotation of the impeller 52 tends to be disturbed.

  Further, the bottom wall portion 37 prevents the water flow from entering the housing portion 35 from the flow path 5 through the axial end portion side of the impeller 52. The water flow other than the water that has entered the housing portion 35 with the rotation of the impeller 52 causes the rotation of the impeller 52 to be inhibited. The water that has entered the housing portion 35 as the impeller 52 rotates is water that has entered the housing portion 35 by being pushed by the blade portion 55.

  However, since the bottom wall portion 37 prevents the water flow from entering the accommodating portion 35 from the axial end portion side of the impeller 52, the rotation of the impeller 52 can be prevented from being hindered. Furthermore, the other end of the accommodating portion 35 is also covered with the lid member 38, and it is possible to prevent the water flow from entering from the lid member 38 side. For this reason, since the rotation of the impeller 52 can be prevented from being hindered, the detection accuracy of the flow rate detection device 50 can be prevented from being lowered.

  Moreover, since the water flow in the connecting pipe member 30 can be rectified by providing the rectifying plate 34 in the first pipe portion 31, the impeller 52 can be stably rotated. Since the impeller 52 can be stably rotated, a decrease in detection accuracy of the flow rate detection device 50 can be prevented.

  Further, the rectifying plate 34 partitions the inside of the first pipe part 31 into the flow path parts S1, S2, S3, S4, and the blade part 55 of the impeller 52 is in the third quadrant Q3 of the second pipe part 32 The impeller 52 can be stably rotated by receiving the flow of rectified water. For this reason, the detection accuracy of the flow rate detection device 50 can be improved.

  Next, the water supply apparatus 10B which concerns on the 2nd Embodiment of this invention is demonstrated using FIG. In addition, the structure which has a function similar to 1st Embodiment attaches | subjects the same code | symbol as 1st Embodiment, and abbreviate | omits description.

  FIG. 7 is a plan view showing the connection pipe member 30A, the flow rate detection device 50, the check valve device 60, and the merging pipe member 70A of the water supply apparatus 10B with a part cut away. FIG. 7 shows a state where the joining pipe member 70A is cut. Although not shown in FIG. 7, the water supply device 10 </ b> B includes the pump device 20, the pipe 80, the pressure detection device 100, and the accumulator 90, as in the first embodiment. .

  As shown in FIG. 7, the connecting pipe member 30 </ b> A is not provided with the flow rate detection device 50 and the point that the accommodating portion 35 is not formed with respect to the connecting pipe member 30 described in the first embodiment. The point is different. Other structures are the same as those of the connecting pipe member 30.

  The joining pipe member 70 </ b> A includes a first inlet 71 that communicates with one check valve device 60, a second inlet 72 that communicates with the other check valve device 60, and a discharge port that communicates with the piping member 80. 73. The joining pipe member 70 </ b> A is formed in a T-shape that is symmetrical with respect to the center line C <b> 4 of the discharge port 73. The first inlet 71 is formed at one end of the joining pipe member 70A. The second inflow port 72 is formed at the other end.

  An accommodating portion 130 that can accommodate the impeller 52 is formed in a portion of the joining pipe member 70 </ b> A that faces the discharge port 73. The accommodating part 130 has the surrounding wall part 131, the bottom wall part 132, and the cover member. The lid member 38 is not shown. The lid member is the same as the lid member 38 described in the first embodiment.

  The peripheral wall portion 131 is a plane that passes through the center line C4 of the discharge port 73 and is symmetric with respect to a plane parallel to a straight line perpendicular to the center line of the first inflow port 71 and the center line of the second inflow port 72. Is formed. In the present embodiment, the center line of the first inlet 71 and the center line of the second inlet 72 are arranged on the same straight line. In other words, they are the same straight line. A center line of the inlets 71 and 72, that is, a straight line passing through the centers of the inlets 71 and 72 is defined as a virtual straight line L1.

  Therefore, the plane passing through the center line C4 of the discharge port 73 and parallel to the straight line perpendicular to the center line of the first inflow port 71 and the center line of the second inflow port 72 is The plane passes through the center line C4 and is orthogonal to the virtual straight line L1 passing through the centers of the inflow ports 71 and 72. This plane is a third virtual plane V3.

  The inner surface 131a of the peripheral wall 131 forms a curved surface having a constant curvature radius. In other words, the inner surface 131a forms part of a virtual cylinder having a constant radius. The center line C5 of the imaginary cylinder of which the inner surface 131a forms a part is disposed on the center line C4. Furthermore, the center line C5 is orthogonal to the direction in which the virtual straight line L1 extends. In a plane orthogonal to the center line C5, an angle formed by the circumferential end of the peripheral wall 131, the other circumferential end of the peripheral wall 131, and the central line C5 is less than 180 degrees.

  Between the circumferential direction one end and the other end of the peripheral wall 131, an opening 135 that connects the inside of the accommodating portion 130 and the flow path 5 is formed.

  The rotation shaft 51 is arranged coaxially with a virtual cylinder whose inner surface 131a forms a part. The length of the blade portion 55 in the radial direction is slightly smaller than the radius of the virtual cylinder of which the inner surface 131a forms a part. For this reason, the blade | wing part 55 does not contact the inner surface 131a. The bottom wall portion 132 is provided at one end of the peripheral wall portion 131 and closes one end of the accommodating portion 130.

  Also in the present embodiment, an opening is formed in a portion that is the other end of the housing portion 130 with respect to the bottom wall portion 132. This opening is covered with a lid member. Thus, both ends of the accommodating portion 130 are covered with the bottom wall portion and the lid member, and communicate with the flow path 5 through only the opening 135.

  In the present embodiment, the merging pipe member 70A has a symmetrical shape with respect to the third virtual plane V3. Therefore, the shape of the flow path 5 formed in the joining pipe member 70A is symmetrical with respect to the third virtual plane V3. The impeller 52 has an axis of the rotation shaft 51 disposed on the center line C4 of the discharge port 73 and is parallel to the third virtual plane V3.

  Therefore, the rotation direction of the rotation of the impeller 52 with respect to the flow of water discharged from one pump device 20 is opposite to the rotation of the impeller 52 with respect to the flow of water discharged from the other pump device 20. However, the rotation speed is almost the same.

  For this reason, since one flow rate detection device 50 can be used in common for both pump devices 20, the structure of the water supply device 10B can be further simplified.

  In the first and second embodiments, the peripheral wall portion 36 covers the impeller 52 in an angle range larger than 180 degrees in the rotation direction, but the peripheral wall portion 36 has an angle of 180 degrees or more. It only needs to be covered by the range. By covering the peripheral wall portion 36 in an angle range of 180 degrees or more, the impeller 52 is exposed to the flow path 5 through the opening 35a in a portion having an angle range of 180 degrees or less in the rotation direction.

  If the portion exposed to the flow path 5 through the opening 35a in the impeller 52 is a portion having an angle range of 180 degrees or less in the rotation direction, the water flow flowing through the flow path 5 rotates the impeller 52 in one direction. Act on.

  Similarly, also in 2nd Embodiment, the surrounding wall part 131 should just be formed so that the impeller 52 may be covered in the angle range of the rotation direction 180 degree | times or more.

  In the first and second embodiments, the water supply devices 10 and 10B supply water as an example of a liquid. As another example, the water supply apparatuses 10 and 10B may supply liquids other than water.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above.

  DESCRIPTION OF SYMBOLS 10 ... Water supply apparatus, 10B ... Water supply apparatus, 20 ... Pump apparatus, 21 ... Pump, 22 ... Motor, 30 ... Connecting pipe member (flow-path part), 32 ... 2nd pipe part (intersection part), 34 ... Current plate 35a ... opening, 36 ... peripheral wall part, 37 ... bottom wall part (wall part), 38 ... lid member (wall part), 52 ... impeller, 53 ... detection part, 55 ... blade part, 61 ... housing (flow path) Part), 70 ... merging pipe member (flow path part), 70A ... merging pipe member (flow path part), 71 ... first inlet, 72 ... second inlet, 73 ... discharge port, 80 ... piping member (Flow path part), 112 ... control part, 131 ... peripheral wall part, 135 ... opening.

Claims (4)

A pump device comprising: a pump that boosts and discharges liquid; and a motor that drives the pump;
A flow path section having a flow path through which the liquid discharged from the pump flows;
An impeller having a plurality of blade portions that are provided in the flow channel portion and receive the liquid flowing in the flow channel;
A peripheral wall portion provided in the flow path portion and covering the impeller 180 degrees or more in the rotation direction and having an opening exposing a part of the blade portion in the flow path;
A detector for detecting the rotational speed of the impeller;
A control unit that calculates a flow rate of the liquid based on a detection result of the detection unit, and controls the motor based on the calculation result;
A water supply apparatus comprising:   The water supply device according to claim 1, further comprising a wall portion that is provided at at least one end of the peripheral wall portion and closes an accommodation space formed inside the peripheral wall portion.   The water supply device according to claim 1, further comprising a current plate provided on the upstream side of the impeller in the flow path portion. A pair of the pump devices are provided,
The flow path section includes a first inlet into which the liquid discharged from one of the pair of pump devices flows, and the liquid discharged from the other pump device of the pair of pump devices. A merging pipe member comprising a second inflow port into which the gas flows and a discharge port for discharging the liquid further downstream,
The flow path formed in the junction pipe member is a plane that passes through the center line of the discharge port and is parallel to a straight line that is orthogonal to the center line of the first inlet and the center line of the second inlet. Having a symmetrical shape with respect to the plane,
The water supply device according to claim 1, wherein an axis of a rotation shaft of the impeller is disposed on the plane.