JP2005054730A - Feed water device of cabinet type - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feed water device of a cabinet type which can perform sufficiently a cooling effect and which is suitable for size reduction. <P>SOLUTION: The feed water device of the cabinet type contains pumps 11, 12, a duct connected to an intake side and a discharge side of a pump casing, motors 13, 14, inverter units 21, 22, and a controller for controlling the motors 13, 14 integrally in a cabinet 10. The inverter units 21, 22 have substrates 21-1, 22-1 which carry an inverter element and the controller, fins 21-2, 22-2 for cooling a heat, and cooling acceleration fans 21-3, 22-3 for accelerating cooling. The inverter units 21, 22 are mounted so that their fins 21-2, 22-2 are brought into close contact with a side plate of the cabinet. Thus, a side plate itself of the cabinet 10 becomes a cooler to further accelerate cooling of the inverter units 21, 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a water supply apparatus, and more particularly to a cabinet-type water supply apparatus in which a pump, a suction pipe, a discharge pipe, a drive motor, an inverter device and the like are integrally housed in a cabinet.

  The water supply device is connected to, for example, a water main or a water receiving tank, and supplies water from the water main or the water receiving tank to a predetermined consumer by pressurizing water to a predetermined pressure. For this reason, the water supply apparatus includes a pump, piping connected to the suction side and the discharge side of the pump casing, pressure sensors for detecting pressure in the piping, a pressure tank, and the like. Here, the pressure tank stores therein the water pressurized by the pump, thereby preventing frequent start and stop of the pump and maintaining the supply water pressure at a necessary pressure. In addition, a motor for driving the pump, a drive power supply circuit such as an inverter for supplying electric power to the motor, and an electric control circuit for controlling the operation of the pump, these are housed in a cabinet together with the above-mentioned pipes. Yes.

  For example, in a water supply device that is connected to a water main and adopts a constant terminal pressure control method and a constant discharge pressure control method so as to keep the feed water pressure at the end consumer at a predetermined pressure, the pump inflow pressure that varies from moment to moment On the other hand, AC / DC power of variable frequency / voltage is supplied to the induction motor and DCBL (DC brushless motor) that drive the pump by an inverter device, etc. so that the end user can always supply water with a constant water pressure, and the rotational speed Control is in progress.

  In such a water supply device, an inverter device is essential, but since the inverter device includes a power semiconductor element, heat is generated by the drive current of the motor. For this reason, some kind of cooling means is necessary, and conventionally the following various cooling methods have been adopted.

  There is a method of mounting an inverter device on a water cooling jacket. According to this method, cooling is performed by passing water through the water cooling jacket, so that the cooling efficiency is high and the area of the heat radiating portion can be reduced. However, piping for water cooling is required, and in order to cool only when overheated, dedicated parts such as a temperature sensor and a solenoid valve for opening and closing the water channel are required, and extra piping is required along with increased costs. . For this reason, it becomes a hindrance to miniaturization of the water supply apparatus as a whole, and further maintenance is required.

Moreover, as shown in Patent Document 1, the motor and the pump are arranged on the same rotating shaft, a pump rotor is attached to one end of the rotating shaft of the motor, a fan is attached to the other end, and the fan is rotated by rotating the motor. In some cases, the cooled air in the cabinet is directed toward the heat dissipating fins of the inverter device due to the airflow. This water supply device is suitable for miniaturization and compactness, and can form a circulating flow in the cabinet, thereby obtaining an overall cooling effect, but when the pump and motor become large and the amount of heat generated from the motor and inverter device increases, There was a problem that a sufficient cooling effect could not be obtained.
JP 2003-21052 A

  As described above, there are water cooling methods and air cooling methods for cooling the cabinet-type water supply device. However, the water cooling method increases the cost, hinders downsizing, and also maintains the equipment constituting the water cooling unit. There is a problem that it is necessary. In addition, the air-cooled type described in Patent Document 1 is effective in a cabinet-type water supply device with a small pump capacity, but there is a problem that a sufficient cooling effect cannot be obtained when the pump capacity becomes large and the drive motor becomes large. is there. An object of the present invention is to provide a cabinet-type water supply apparatus that eliminates such problems, can sufficiently exhibit a cooling effect, and is suitable for downsizing.

  In order to solve the above-mentioned problem, the invention described in claim 1 includes a pump that pressurizes and feeds water, piping connected to a suction side and a discharge side of a casing of the pump, a motor that drives the pump, In a cabinet-type water supply apparatus in which an inverter device that supplies electric power to a motor and a control unit that controls the motor are integrally housed in a cabinet, the inverter device includes a substrate unit on which the inverter element and the control unit are mounted, An inverter device comprising: a fin portion that cools heat generated in the substrate portion; and a cooling promotion fan that promotes cooling; a configuration that includes only the substrate portion; or a configuration that includes the substrate portion and the fin portion. The substrate part or the fin part is attached in close contact with the side plate of the cabinet. In this way, by attaching the inverter device with its fins in close contact with the side plate of the cabinet, the side plate of the cabinet itself becomes a cooling body, and cooling of the inverter device is further promoted.

  The invention according to claim 2 is the cabinet-type water supply apparatus according to claim 1, wherein the side plate of the cabinet is a door side surface of the cabinet. In this way, by attaching the inverter device with its fins in close contact with the side plate of the cabinet, the cabinet door is usually placed facing the space that opens and closes the door, so the ventilation is good and the heat dissipation effect is excellent. Therefore, cooling of the inverter device is further promoted.

  According to a third aspect of the present invention, in the cabinet-type water supply device according to the first or second aspect, an air inlet and an air outlet are provided on a side surface of the cabinet, and outside air is forcibly introduced into the cabinet from the air outlet. The heat is exchanged with the heat radiated in the cabinet and exhausted from the exhaust port. In this way, by introducing the outside air into the cabinet, exchanging heat with the heat radiated in the cabinet and exhausting it, the heat radiated from the inverter device and the motor can be efficiently radiated outside the cabinet.

  According to a fourth aspect of the present invention, in the cabinet-type water supply apparatus according to the first or second aspect, the inverter device includes a substrate portion and a fin portion, and an intake port and an exhaust port are provided on a side surface of the cabinet. And the outside air is forcibly introduced into the fin portion from the intake port, heat is exchanged with the heat radiated from the fin portion, and exhausted from the exhaust port. In this way, by forcibly introducing the outside air into the fin portion, exchanging heat with the heat dissipated in the fin portion, and exhausting it, the heat dissipated from the inverter device can be efficiently dissipated outside the cabinet. . At this time, dust and the like are introduced to some extent along with the introduction of the outside air, and even if they adhere to the fin surface, it does not cause any serious trouble.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a large capacity | capacitance cabinet type water supply apparatus, the structure is simple, the cooling effect can fully be exhibited, and the cabinet type water supply apparatus which can be reduced in size can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and FIG. 2 are views showing the configuration of a water supply apparatus according to the present invention, FIG. 1 is a side view showing the arrangement configuration of the devices in the cabinet, and FIG. 2 is a front view showing the arrangement configuration of the devices in the cabinet. .

  In the figure, reference numeral 10 denotes a cabinet, and pumps 11 and 12 are arranged in the cabinet 10. The rotary shafts of the pumps 11 and 12 are arranged in the vertical direction, and the motors 13 and 14 are arranged on the upper side of the pump casing, respectively. The suction ports 11a and 12a of the pumps 11 and 12 are connected to the suction pipe 15, and the suction pipe 15 is connected to the discharge collecting pipe 16 via a check valve. This check valve can supply water without pumps 11 and 12 when the inflow water pressure of the suction pipe 15 connected to the water main is sufficiently high, for example, and prevents backflow when the inflow side pressure is low. Is for. This check valve may or may not be built in the suction pipe 15. A pressure tank 17 for accumulating pressurized water is connected to the discharge collecting pipe 16. The pressure tank 17 accumulates pressurized water to prevent frequent start / stop of the pumps 11 and 12 and keeps the supply water pressure smoothly and constant.

  A strainer 18 and a backflow prevention device 19 are connected to the suction pipe 15, and a suction port 15 a of the suction pipe 15 is connected to a pipe line such as a water main pipe (not shown). The discharge port 16a of the discharge collecting pipe 16 is connected to a pipe line to the end consumer side (not shown). Various pipes and valves such as pumps 11 and 12, a suction pipe 15, and a discharge collecting pipe 16 are fixed to a gantry 20 provided at an inner bottom portion of the cabinet 10 via a vibration isolator such as a rubber pad 24.

  Inverter devices 21 and 22 are arranged on the inner surface of the cabinet 10. Here, the inverter device 21 drives the motor 13 at a variable speed by supplying AC power of variable frequency and voltage to the motor 13 via a cable (not shown). The inverter device 22 drives the motor 14 at a variable speed by supplying AC power of variable frequency and voltage to the motor 14 via a cable (not shown). The motor 13 and the pump 11 are disposed on the same rotational axis, and similarly, the motor 14 and the pump 12 are disposed on the same rotational axis. Reference numeral 23 denotes a control panel.

  3A and 3B are diagrams showing a configuration example of the inverter device 21. FIG. 3A is a lower side view, FIG. 3B is a front view, and FIG. 3C is a left side view. As shown in the figure, the inverter device 21 includes a board part 21-1 on which an inverter element part (power semiconductor element) and a control part are mounted, and a fin part 21-2 that radiates heat generated from the board part 21-1. Are integrally formed, and a cooling promotion fan 21-3 for promoting cooling is provided at an end of the fin portion 21-2. Since the inverter device 22 has the same configuration as the inverter device 21, the description thereof is omitted.

  The inverter device 21 is attached with its fin portion 21-2 in close contact with the side plate of the cabinet 10. The inverter device 22 is also mounted with its fin portion 22-2 in close contact with the side plate of the cabinet 10. When the cooling promotion fans 21-3 and 22-3 are rotated during the operation of the pumps 11 and 12, that is, during the operation of the motors 13 and 14, the air in the cabinet 10 is forced into the fins 21-2 and 22-2. Therefore, heat is exchanged with the heat radiated from the fins of the fin portions 21-2 and 22-2 and flows into the cabinet 10.

  Thus, by attaching the inverter devices 21 and 22 with the fin portions 21-2 and 22-2 in close contact with the side plate of the cabinet 10, the side plate of the cabinet 10 itself becomes a cooling body, and the fin portions 21-2 and 22. Since the heat is taken directly from the fins in -2, the cooling of the inverter device is further promoted.

  Usually, the cabinet 10 of such a water supply apparatus is provided with a door of a double door, and the front of such a double door is a space for opening and closing the door, and the ventilation is good. Therefore, by attaching the inverter devices 21 and 22 to the back surface of such a door so that the fin portions 21-2 and 22-2 are in close contact with each other, the door itself becomes a cooling body having an excellent heat radiation function. The cooling of the device is further promoted.

  In addition, the inverter unit 21 is configured integrally with the board part 21-1 on which the inverter element part and the control part are mounted as described above, and the fin part 21-2 that radiates heat generated from the board part 21-1. 4, the fin portion 21-2 is attached in close contact with the side plate 10 a of the cabinet 10, and the intake port 25 and the exhaust port 26 are provided on the side plate 10 a of the cabinet 10, and the intake port is further provided. 25 and the exhaust port 26 and ducts 27 and 28 for communicating the air inlet and outlet of the fin portion 21-2 of the inverter device 21, respectively, are provided. The cooling promotion fan 21-3 introduces outside air into the fin portion 21-2 from the intake port 25 through the duct 27, exchanges heat with the heat radiated from the fin portion 21-2, and passes through the duct 28 from the exhaust port 26. By exhausting, the inverter device 21 can be efficiently cooled. In addition, in this case, since the outside air does not flow into the substrate portion 21-1, dust or the like enters the substrate portion 21-1, and does not cause a failure such as an insulation failure. In addition, although illustration is abbreviate | omitted, the inverter apparatus 22 is similarly attached, and the inverter apparatus 22 can be efficiently cooled by introduce | transducing external air into the fin part 22-2.

  Although not shown, the side plate 10a of the cabinet 10 is provided with an air inlet and an air outlet, through which air is forcibly introduced into the cabinet 10 through the filter, and heat radiated into the cabinet 10 Even if heat is exchanged and exhausted from the exhaust port, dust or the like does not flow in with the outside air, and a failure such as an electric insulation failure of the board portions 21-1 and 22-1 of the inverter devices 21 and 22 occurs. Can be suppressed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

It is a front view which shows the arrangement configuration of the apparatus in the cabinet of the cabinet-type water supply apparatus which concerns on this invention. It is a side view which shows the arrangement configuration of the apparatus in the cabinet of the cabinet-type water supply apparatus which concerns on this invention. It is a figure which shows the structural example of an inverter apparatus, Fig.3 (a) is a lower side view, FIG.3 (b) is a front view, FIG.3 (c) is a left view. It is a figure which shows the attachment structure of the inverter apparatus of the cabinet type water supply apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cabinet 11 Pump 12 Pump 13 Motor 14 Motor 15 Suction pipe 16 Discharge collecting pipe 17 Pressure tank 18 Strainer 19 Backflow prevention device 20 Base 21 Inverter device 22 Inverter device 23 Control panel 24 Rubber pad 25 Intake port 26 Exhaust port 27 Duct 28 Duct

Claims (4)

A pump for pressurizing and feeding water, piping connected to the suction and discharge sides of the pump casing, a motor for driving the pump, an inverter device for supplying electric power to the motor, and controlling the motor In the cabinet-type water supply apparatus that integrally accommodates the control unit in the cabinet,
The inverter device includes a substrate portion on which the inverter element and the control unit are mounted, a fin portion that cools heat generated in the substrate portion, and a cooling promotion fan that promotes cooling, or only the substrate portion. Or a structure comprising the substrate part and the fin part.
A cabinet-type water supply device, wherein the inverter device is attached with its substrate portion or fin portion in close contact with a side plate of the cabinet. The cabinet-type water supply apparatus according to claim 1,
A cabinet-type water supply device, wherein the side plate of the cabinet is a door side surface of the cabinet. The cabinet-type water supply apparatus according to claim 1 or 2,
An air inlet and an exhaust port are provided on the side of the cabinet, and outside air is forcibly introduced into the cabinet through the exhaust port, heat exchanged with heat radiated into the cabinet, and exhausted from the exhaust port. A cabinet-type water supply device. The cabinet-type water supply apparatus according to claim 1 or 2,
The inverter device is configured to include the substrate portion and the fin portion, and is provided with an intake port and an exhaust port on a side surface of the cabinet, forcibly introducing outside air into the fin portion from the intake port, A cabinet-type water supply device that performs heat exchange with heat radiated from a fin portion and exhausts air from the exhaust port.

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