JP2001107877A - Water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply system in which a motor for driving a pump and the driving power supply circuit thereof can be efficiently cooled. SOLUTION: In this water supply system comprising by integrally storing in a cabinet 10 a plurality of pumps 11, 12 for feeding water by pressurizing water, a piping connected to the suction and discharging sides of the casing of the pumps, a tank 19 which is connected to the piping and accumulates water pressurized by the pump, motors 11a, 12a for driving the pump, a driving power supply circuit 40 for supplying electric power to the motors and an electrical control circuit 39 for controlling the operation of the pump, a water-cooled jacket 41 having a structure that water can flow in its inside is provided, the motor is fixed on one cooling surface of the water-cooled jacket, and also the driving power supply circuit for supplying electric power to the motor is fixed on the other cooling surface thereof. A part of water pressurized by the pump is led to flow into the water-cooled jacket and thus the motor and driving power supply circuit thereof can be simultaneously cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a water supply device,
In particular, the present invention relates to a water supply device that supplies water such as tap water to an apartment house, a building, and the like using a pump.

[0002]

2. Description of the Related Art FIG. 5 shows a configuration example of a conventional water supply device. This water supply device is for supplying water such as tap water to an apartment house, a building, and the like using the pumps 11 and 12. The suction port 13 is connected to a water main pipe or a water receiving tank (not shown) through a pipe, and the water supply port 14 is similarly connected to a water tap of a terminal consumer such as an apartment house or a building through a pipe (not shown). . The suction port 13 is provided with a pressure-reducing backflow preventer 16,
The pipes are connected to the suction side flanges of the pumps 11 and 12 via the suction header 15 and the like. On the other hand, pumps 11 and 1
2 is connected to the discharge collecting pipe 17 and the discharge header 1
A water supply port 14 is connected to a pipe (not shown) through 8 to supply water to end users.

The discharge collecting pipe 17 has a branch pipe and is connected to a pressure tank 19. The pressure tank 19 stores the water pressurized by the pump, thereby preventing the pump from being frequently started and stopped. Further, the discharge collecting pipe 17 or the discharge header 18 is provided with a pressure sensor for detecting a water pressure.
The suction header 15 is provided with a pressure sensor for detecting a suction pressure on the pump inflow side, transmits these signals to a control panel 39, and controls the pump 1 by a control circuit arranged in the control panel 39.
Operation control of 1 and 12 is performed.

[0004]

Such a water supply device is often disposed in a utility corner underground or above the ground in an apartment house or a building. However, it is generally difficult to secure a sufficient area in such a place, and it is required to have sufficient water supply capacity and reliability as a water supply device, and to reduce the size and size of the water supply device.

Conventionally, in this type of water supply device, in order to prevent a temperature rise in a narrow cabinet, a device for cooling a motor as a heat source and a power supply circuit for driving the motor has been devised. One approach is to use a fan for forced air cooling, but this requires the installation of a fan, which increases costs and secures space for this in cabinets where compactness is strongly required. There is also a problem. For this reason, a part of the water pressurized by the pump has been used to cool the motor and its drive power supply circuit by water cooling.

However, in the conventional cooling method using water cooling, the motor and its driving power supply circuit are individually cooled by providing a water cooling jacket. That is, in the case of two variable speed pumps, two motors 11a, 12
a and two drive power supply circuits (inverter devices) 40a,
It was necessary to attach a water-cooling jacket individually to 40b and cool it. In this case, as shown, a cooling jacket 40a is used for the motor 11a, and a cooling jacket 40b is used for the motor 12a.
1a and 41b were cooled using one cooling jacket 40c. Therefore, pipes 47a and 48a for passing water through the cooling jacket 40a are required, and pipes 47b and 48b for passing water through the cooling jacket 40b are required. , 48c are required, so that not only three water-cooling jackets are required, but also three sets of cooling water pipes, and three sets of solenoid valves and temperature sensors for controlling the flow of water. Was needed.

The present invention has been made in view of the above circumstances, and has as its object to provide a water supply device that can efficiently cool a motor for driving a pump and a power supply circuit for driving the motor.

[0008]

SUMMARY OF THE INVENTION A water supply apparatus according to the present invention comprises a plurality of pumps for supplying water by pressurizing water, a pipe connected to a suction side and a discharge side of a casing of the pump, and a pipe connected to the pipe. A tank for accumulating water pressurized by the pump, a motor for driving the pump, a drive power supply circuit for supplying power to the motor, and an electric control circuit for controlling the operation of the pump. In a water supply device housed in a cabinet, a water cooling jacket having a structure capable of passing water inside is provided, and the motor is fixed to one cooling surface of the water cooling jacket, and power is supplied to the motor to the other cooling surface. That the motor and the drive power supply circuit are simultaneously cooled by fixing a drive power supply circuit to be driven and passing a part of the water pressurized by the pump through the water cooling jacket. And butterflies.

According to the present invention, the water cooling jacket can be used for cooling both the motor and the drive power supply circuit at the same time, so that the number of parts can be reduced. That is, since the motor and the drive power supply circuit have a relationship that the motor rotates by the power supplied from the drive power supply circuit, both generate heat simultaneously. For this reason, when one of the coolings is performed, the other is necessarily cooled, so that the number of components such as the temperature sensor and the solenoid valve can be reduced. Further, since the number of cooling pipes can be similarly reduced, the arrangement of each component in the cabinet can be simplified, and the manufacturing cost can be reduced.

The water cooling jacket is provided with a temperature detecting means, and a pipe for passing water through the water cooling jacket is provided with an automatic opening / closing valve, and water is supplied to the water cooling jacket in accordance with the temperature detected by the temperature detecting means of the water cooling jacket. Is preferably controlled. Further, it is preferable that the control of the automatic on-off valve is performed such that the automatic on-off valve is opened when the temperature is equal to or higher than the high temperature set value, and the automatic on-off valve is closed when the temperature is equal to or lower than the low temperature set value.

Thus, it is possible to prevent the temperature from rising above a predetermined temperature while also using the water cooling jacket for cooling the motor and the drive power supply circuit, and to prevent the water cooling jacket from being excessively cooled below the predetermined temperature. . Therefore, the occurrence of dew condensation due to the supercooling of the water-cooling jacket by the cold water is prevented, and there is no danger that water droplets will adhere to the electrical components and cause problems such as electric leakage.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawings, the same reference numerals indicate the same or corresponding parts.

FIG. 1 shows an example of the configuration of a water supply device according to the present invention. In the cabinet 10, the respective suction side flanges of the two pumps 11 and 12 are connected to and fixed to the suction collecting pipe 15. The suction manifold 15 is connected to a suction port 13 of a water supply device via a pressure-reducing backflow prevention valve 16. The pumps 11 and 12 are arranged so that their rotation axes are vertical, and motors 11 a and 12 a for driving the pumps 11 and 12 are fixed to upper portions of casings of the pumps 11 and 12. The discharge ports of the pumps 11 and 12 are arranged so as to face each other, and a discharge collecting pipe 17 is linearly connected between the discharge ports. And discharge collecting pipe 1
A pressure tank 19 is fixed on the upper side of a substantially central portion of 7 via a branch pipe. A discharge header 18 is disposed below the discharge collecting pipe 17 in a T-shape, and the discharge header is connected to a water supply port (discharge port) 14 of the water supply device.

Motor 11 for driving pumps 11 and 12
Reference numerals a and 12a denote, for example, DC brushless motors, which are driven by a drive power supply circuit 40 having an output circuit composed of six-arm power switching elements similar to the inverter device. That is, the drive power supply circuit 40 is composed of a rectifying / smoothing circuit that rectifies a commercial AC power supply and converts it to DC, and an output circuit that supplies a pulsed output having a predetermined width to the motor by turning on / off a power switching element from DC. I have.

As shown in FIG. 1B, a motor 11a (12a) is fixed to one surface of the water cooling jacket 41, and a drive power supply circuit 40 is fixed to another surface. here,
The motor fixed to the opposite surface of the water cooling jacket is rotationally driven by the electric power supplied by the driving power supply circuit. The water cooling jacket 41 has a structure that allows water to flow inside as shown in FIG. 2, and the motor 11 a (12
a) and the heat generated by the drive power supply circuit 40 is absorbed to prevent the temperature inside the cabinet from rising. That is, inside the water cooling jacket 41 made of aluminum, a U-shaped stainless steel pipe 4 is provided.
1w, and by passing water through it, the motor and the drive power supply circuit fixed to both surfaces thereof are cooled. The heat generated by the operation of the pump is cooled by the liquid handled by the pump itself.

As shown in FIG. 1 (a), the pumps 11, 1
The pressurized water of the pump is taken into the water cooling jacket 41 from the discharge collecting pipe 17 of the
After cooling a (12a) and the drive power supply circuit 40, the cooling water is returned to the suction collecting pipe 15 on the pump suction side by the cooling pipe 48. The cooling pipe 48 is provided with an automatic opening / closing valve 45, and the valve 45 opens and closes according to a signal from the control device 39. On the other hand, the water cooling jacket 41 is provided with a temperature sensor 46, and this signal is transmitted to the control device 39. The control device 39 opens the valve 45 when the temperature of the water cooling jacket 41 becomes equal to or higher than a predetermined temperature according to a signal of the temperature sensor 46, and starts water cooling to start cooling. When the temperature of the water cooling jacket 41 becomes lower than a predetermined temperature, the valve 45 is closed to shut off the flow of water inside, thereby preventing overcooling.

FIG. 3 is a front view showing the entire configuration of the water supply apparatus according to the embodiment of the present invention, FIG. 4 (a) is a left side view thereof, and FIG. 4 (b) is a right side view thereof. As shown in the drawing, a support plate 23 is horizontally disposed substantially at the center of the cabinet 10. The support plate 23 is supported at both ends by a support portion 25 attached to the cabinet side plate via a vibration isolator 26 such as rubber. The support plate 23 is connected and fixed to the pump and its piping at the suction port flange of the pump. The pumps 11 and 12, the discharge collecting pipe 17, and the pressure tank 1 are provided above the support plate 23.
9, a control panel 39, a drive power supply circuit 40 for supplying a variable frequency / voltage to the pump, and the like.

At the upper part of the support plate 23, two pumps 11 and 12 are arranged on the left and right, and a straight discharge collecting pipe 17 is connected between the discharge ports facing each other. The discharge header 18 is connected downward, and is connected to an external water supply pipe (not shown) at the water supply port 14 via a valve 45 with a bypass function. The discharge valve 45 has a handle 45a so that the water supply port 14 can be opened and closed. A branch pipe is provided upward at substantially the center of the discharge collecting pipe 17, and is connected to the pressure tank 19 via an on-off valve 38.

On the suction side of the pump, there is provided a suction collecting pipe 15 communicating with the suction port, and a pipe is connected to the suction port 13 of the water supply device. The suction collecting pipe 15 is connected by a check valve (not shown) disposed between the suction collecting pipe 15 and a valve 45 having a bypass function disposed in front, and as a result, the suction collecting pipe 15 is connected to the discharge-side pipe 18 via the check valve. When the pressure on the inflow side is equal to or higher than the required pressure, water is directly supplied to the discharge side without passing through a pump. Reference numeral 16 denotes a decompression type backflow preventer, which is for preventing the supplied water from flowing back into a water main pipe or a water receiving tank connected to the suction side.

The discharge header 18 is provided with a pressure sensor 43 for detecting the water pressure on the pump discharge side, and the suction header is similarly provided with a pressure sensor 44 for detecting the pressure on the pump suction side. The signals from these sensors 43 and 44 are transmitted to the control panel 39, and are used for starting and stopping the pump or controlling the discharge pressure to be constant. The pumps 11 and 12 are driven by DC brushless motors 11a and 12a. A variable frequency and voltage are supplied to the motors from a drive power supply circuit 40, and the pumps are controlled at a variable speed by a command from a control panel 39. The drive power supply circuit 40 and the motors 11a and 12a are fixed to the water cooling jacket 41 in close contact with each other, so that good heat radiation characteristics can be obtained. In this example, the shape of the motor casing is a rectangular parallelepiped, and the heat radiation area is increased by close contact with a flat water cooling jacket. When the motor casing is a cylindrical tube, it is necessary to prepare a water cooling jacket shape corresponding to the tubular shape.

In each of the water cooling jackets 41, a motor and a drive power supply circuit for supplying power to the motor are fixed to the front side and the back side. Therefore, when the drive power supply circuit operates and generates heat, the motor also operates and generates heat at the same time. Since these calorific values are in a proportional relationship, one calorific value is sufficiently absorbed by water cooling and maintained in a predetermined temperature range, so that the other calorific value can be reduced simultaneously. That is, by utilizing the characteristic of simultaneously generating heat for two heat sources that generate heat at the same time, cooling control of two heat sources can be performed by one set of cooling systems.

The motors 11a and 12a and the driving power supply circuit 40 for driving the motors 11a and 12a
Located at the top inside. The control panel 39 is also arranged at the uppermost part in the cabinet, and various pipes are arranged under the control panel 39. Therefore, even if dew condensation generated on the surface when cold water flows through these various pump casings and pipes also falls as water droplets, electrical components such as a motor, a drive power supply circuit device, and a control panel located above the components. There is no influence such as earth leakage.

The water supply device is a cabinet 10 as a whole.
And mounted on the pedestal 37 and fixed.
The required height from the ground contact surface to the lower surface of the water supply device is secured. Further, the control panel 39 is provided inside the cabinet 10 of the water supply device as described above, and controls the operation of the pumps 11 and 12. As described above, the temperature of the water-cooled jacket is detected, and if the temperature is equal to or higher than the predetermined upper limit, the automatic opening / closing valve is opened to cool. If the value is equal to or less than the lower limit, the automatic opening / closing valve is closed to prevent overcooling. When the water consumption on the customer side becomes extremely small, the control panel 39 performs a pressure accumulation operation in the pressure tank 19 for a predetermined time by a timer to prevent the pump from running idle, and then stops the pump. Meanwhile, pump 11,
The water discharged from the discharge ports 12 flows into the pressure tank 19 from the central part of the discharge collecting pipe 17 through the ball-type gate valve 38 and is stored.

A driving power supply circuit 40 is arranged near the motors 11a and 12a for driving the pumps, and supplies a variable frequency and voltage to the motors of the pumps 11 and 12 so that the discharge pressure of the pumps is kept constant. Variable speed operation is performed. In addition, a constant estimated pressure control method that adjusts the discharge pressure of the pump so that the water pressure on the consumer side is constant, taking into account the pipe resistance of the pipeline to the consumer side as necessary, may be adopted. You may do it.

[0025]

As described above, according to the present invention,
Since the water-cooling jacket can be used for cooling the motor and the drive power supply circuit, the number of the water-cooling jacket and the associated piping and control parts can be reduced by half. Therefore, it is possible to provide a water supply device with a simplified structure in the cabinet and reduced cost.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration example of a water supply device of the present invention, where (a) is a front view and (b) is a side view near a water cooling jacket.

FIG. 2 is a (a) top view, (b) front view, (c) bottom view, and (d) side view of a water cooling jacket.

FIG. 3 is a front view of the water supply device according to the embodiment of the present invention.

4A is a left side view and FIG. 3B is a right side view of FIG.

FIG. 5 is a diagram showing a configuration example of a conventional water supply device;
(A) is a front view, (b) is a side view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Cabinet 11, 12 Pump 11a, 12a Motor 13 Suction port 14 Water supply port 15 Suction header (collecting pipe) 16 Decompression type backflow prevention device 17 Discharge collecting pipe 18 Discharge header 19 Pressure tank 25 Support member 26 Vibration-proof material 33, 34 Closure Ball valve with valve and check valve function 37 Mount 39 Control panel 40 Drive power supply circuit 41 Water cooling jacket 43 Discharge pressure sensor 44 Suction pressure sensor 47, 48 Cooling pipe

Continued on the front page (72) Inventor Kaoru Yagi 11-1 Haneda Asahimachi, Ota-ku, Tokyo F-term in EBARA CORPORATION (reference) 3H045 AA09 AA16 AA23 BA20 BA43 CA02 CA03 CA19 DA07 DA11 EA13 EA16 EA34 EA43 3H071 AA01 BB11 CC00 DD14 DD15 DD26 DD32 DD76 DD84

Claims (3)

[Claims] A plurality of pumps for pressurizing and sending water;
A pipe connected to the suction side and the discharge side of the casing of the pump, a tank connected to the pipe for accumulating water pressurized by the pump, a motor driving the pump, and supplying power to the motor A water supply apparatus having a driving power supply circuit and an electric control circuit for controlling the operation of the pump, which are integrally housed in a cabinet. By fixing the motor to the cooling surface, fixing a drive power supply circuit for supplying power to the motor to the other cooling surface, and passing a part of the water pressurized by the pump through the water cooling jacket. And a water supply device for cooling the motor and its driving power supply circuit at the same time. 2. A temperature detecting means in the water cooling jacket,
Equipped with an automatic opening and closing valve in the pipe that passes through the water cooling jacket,
2. The water supply device according to claim 1, wherein water supply to the water cooling jacket is controlled in accordance with a temperature detected by the temperature detection means of the water cooling jacket. 3. 3. The automatic on-off valve according to claim 2, wherein the control of the automatic on-off valve is performed such that the automatic on-off valve is opened at a temperature equal to or higher than a high temperature set value, and is closed at a low temperature set value or less. Water supply device.