JP3865416B2 - Low noise pump device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a low noise type pump device that can reduce noise of the pump device.
[0002]
[Prior art]
The pump device targeted by the present invention is mainly used when water is supplied to buildings such as apartment houses, schools, hotels and the like where water supply pressure is insufficient with water main water pressure. The pump device is connected to a water main or a water receiving tank for storing water of the water main to perform pressurized water supply. The pump device is required to have low noise such as mechanical noise and water flow noise during operation, a small installation area, good workability during maintenance, or reliability of the device itself.
[0003]
FIG. 12 is a view showing a conventional pump device. As shown in FIG. 12, as a noise countermeasure of the pump device, a method of covering the pump device P with the cover 1 or a method of attaching a sound absorbing material 2 such as glass wool on the inner surface of the cover 1 to reduce the internal sound pressure is adopted. Yes.
[0004]
[Problems to be solved by the invention]
However, in the conventional pump device, heat generated from the motor, inverter, thyristor, triac, etc. is dissipated outside the cover for the purpose of thermal protection of the motor, semiconductor parts, electric cord, etc. inside the pump device. Therefore, as shown in FIG. 12, it is necessary to suppress an increase in internal temperature by a method in which an opening 3 is provided in the cover 1 and the sound absorbing material 2 to perform natural ventilation, a method in which forced ventilation is performed by a ventilation fan 4 or the like. There wasn't. In this case, since the sound-absorbing material 2 also has a heat retaining effect, the area of the opening 3 is enlarged, the utterance preventer 5 such as a silencer provided in the opening 3 is enlarged, and it is difficult to cut off the sound propagation. .
[0005]
In addition, it is difficult to keep the ambient temperature inside the cover uniform by the method using natural ventilation, and the positions where parts that require thermal protection are installed are limited. Moreover, the method using forced ventilation not only lost energy, but the ventilation fan itself became a consumable part, leading to a decrease in reliability.
[0006]
On the other hand, since the control device 6 has a charging part such as an electric wiring connection terminal part between control parts and an electric wiring terminal to the outside, it has a dedicated case 7 as shown in FIG. It had a double structure with the cover. For this reason, the heat dissipation effect was further reduced, and there was a risk of overheating under adverse conditions such as an increase in ambient temperature or continuous operation. In addition, the wiring to the cover internal device cannot be said to have good workability with the disassembly of the cover and the opening and closing of the control device case.
[0007]
The present invention has been made in view of the above-described problems. The noise and vibration from the pump device are blocked by a cover having a sealed structure, etc., and the internal temperature rise is suppressed to improve reliability and improve maintenance. An object of the present invention is to provide a low-noise pump device that can be made to operate.
[0008]
[Means for Solving the Problems]
The present invention for achieving the above object, in a pump device including a plurality of pump rotationally driven by an electric motor, and pipes for directing fluid to the pump, and a controller for controlling the pump, the pump And the piping and the control device are housed in a cover having a sealed structure, and the pump is an all-around flow type inline pump having a built-in electric motor and having a flow path on the entire outer periphery thereof. The control device is arranged to be cooled by cooling water in a cooling pipe branched from the main pipe of the pump, and one end of the cooling pipe is a pump discharge port of the discharge pipe and a check valve installed downstream thereof. is connected between the other end is not connected to the inlet pipe, wherein an electromagnetic valve is provided in the cooling piping, the starting of the pump the opening and closing of the solenoid valve, in conjunction with the stop, the Ri diaphragm during cooling piping mechanism the provided water in the cooling water It is characterized in that to adjust the.
According to one aspect of the present invention, a constant flow valve is provided in each of the cooling pipes so as to keep the flow rate of the cooling water constant.
According to one aspect of the present invention, the cooling pipe is provided in a number corresponding to the number of pumps .
[0009]
[Action]
According to the present invention, the pump device can be covered with a cover having a sealed structure, and propagation of sound and vibration of the pump device to the outside of the cover can be blocked. In addition, since the control device is water-cooled with cooling water in the cooling pipe branched from the main pipe of the pump, the temperature rise of the control device is small, so there is little temperature rise in the cover, excellent durability, and maintenance maintenance An excellent pump device can be obtained.
[0010]
【Example】
Embodiments and reference examples of a low noise pump device according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a diagram showing the overall configuration of a reference example of the present invention. In the low noise pump device, a flow path is constituted by a pump 8 that is rotationally driven by an electric motor 16, an inflow pipe 9 that guides fluid to the pump 8, and a discharge pipe 10 that guides fluid from the pump 8. The low noise pump device further includes a base 11 on which the components 8, 9, and 10 constituting these flow paths are mounted, a control component 12 such as a flow rate switch that controls the operation of the pump 8, and a control device that controls the pump 8 14 and a base 11 and a cover 15 for housing the pump 8, the inflow pipe 9 and the discharge pipe 10.
[0011]
The pump 8 is an all-around flow type in-line pump having a built-in electric motor 16, and has a flow path on the entire outer periphery of the electric motor 16. The electric motor 16 is water-cooled, and the heat generated from the electric motor 16 is dissipated to the outside of the cover 15 together with the fluid, and the heat is hardly retained inside the cover 15.
Moreover, since the outer periphery of the electric motor 16 that is a rotating body is covered with a fluid, the sound generated by the electric motor 16 is absorbed by the fluid. Therefore, the pump 8 itself has a soundproofing effect.
[0012]
FIG. 2 is a diagram showing the overall configuration of the cooling device. As shown in FIG. 2, a heating element 17 such as a switching element that controls the phase angle, such as a triac or thyristor in the control device 14, or an inverter that controls the frequency, is in close contact with the radiator 18 having a high thermal conductivity. Is arranged. A cooling pipe 19 is embedded in the heat radiating body 18 so as to pass through the heat generating body 17. One end of the cooling pipe 19 is connected between the pump discharge port of the discharge pipe 10 and a check valve 20 installed on the downstream side, and the other end is connected to the inflow pipe 9.
[0013]
The discharge pipe 10 has a higher pressure than the inflow pipe 9 during the pump operation when the heat generation amount of the heat generating body 17 is large. Accordingly, the liquid serving as cooling water flows in the cooling pipe 19 from the discharge pipe 10 to the inflow pipe 9. Further, when the pump is stopped, the cooling water extraction portion of the discharge pipe 10 has the same pressure as that of the inflow pipe 9, so that the cooling water does not flow. However, at this time, the heating element 17 hardly emits heat, so a cooling effect is not necessary.
[0014]
FIG. 3 is a diagram showing the configuration of the cooling device when a plurality of pumps are installed. As shown in FIG. 3, when there are a plurality of pumps, the number of cooling pipes 19 is installed, and one end of each cooling pipe 19 is connected to the discharge port of each pump and a check valve 20 installed downstream thereof. The other end joins and is connected to the inflow pipe 9.
At this time, the cooling pipes 19 from the respective pumps are made to correspond to the heating elements 17 that generate heat during the operation of each pump, and the cooling pipes 19 are embedded in the radiator 18 so as to pass through the immediate vicinity of the heating elements 17. As a result, since the highest temperature part inside the radiator 18 is always cooled, the cooling effect is improved.
[0015]
FIG. 4 is a diagram showing another example of the cooling device when a plurality of pumps are installed. When there are a plurality of pumps, the number of cooling pipes increases, the pipes become complicated, and the entire pump device becomes large. Therefore, as shown in FIG. 4, the cooling pipes 19 branched from the pump discharge ports are joined together. In consideration of the case where only one pump is operated at this time, a check valve 21 is provided in each cooling pipe 19 so that the cooling water does not flow into other pump discharge ports.
[0016]
FIG. 5 shows an embodiment of the present invention, which is a modification of the reference example shown in FIG. 4, in which an electromagnetic valve 22 is provided as an alternative to the check valve 21. The solenoid valve 22 is opened when the pump is operating and closed when the pump is stopped. For the operation of the electromagnetic valve 22, a timer is set, and the heat remaining in the heat generator 17 and the heat radiator 18 is absorbed by delaying the timing for closing the electromagnetic valve by a certain time from the stop of the pump.
[0017]
FIG. 6 shows another modification of the reference example shown in FIG. As shown in FIG. 6, when the electromagnetic valve 22 is placed in the cooling pipe 19, it can be cooled by one cooling pipe 19 from the downstream side of the check valve 20 installed on each pump discharge side. . According to this method, the cooling water flows during the pump operation for the same reason as described above, and the flow path is not cut off by the electromagnetic valve 22 when the pump is stopped. Therefore, the pressure drop in the discharge pipe 10 can be prevented. As described above, when the solenoid valve is installed in the cooling pipe, various piping systems can be set, and the parts of the pump device can be more flexible in position and can be made compact.
[0018]
Although energy loss occurs due to the circulation of the cooling water, when the installation position, length, pipe diameter, etc. inside the radiator of the cooling pipe 19 are fixed, the cooling effect is the amount of cooling water flowing inside the cooling pipe 19 The place by is big. Further, since this flow rate is determined by the pressure difference between the discharge pipe 10 and the inflow pipe 9, it is necessary to adjust the amount of water according to the type of pump and the operating point to suppress energy loss. FIG. 7 is a diagram showing an embodiment in which energy loss due to cooling water recirculation is suppressed. In this apparatus, as shown in FIG. 7, a gate valve 23 is installed in a part of the cooling pipe 19. The gate valve 23 has a function of adjusting the amount of water flowing through the cooling pipe 19 and can suppress energy loss.
[0019]
FIG. 8 shows a modification of the embodiment shown in FIG. In the example shown in FIG. 8, an orifice 24 is provided in the cooling pipe 19 in order to easily set the amount of water flowing in the cooling pipe 19 described above. The orifice 24 can also control the amount of water according to the type of pump and the operating point, and suppress energy loss.
[0020]
FIG. 9 is a diagram showing another modification of the embodiment shown in FIG. In the example shown in FIG. 9, a constant flow valve 25 is installed as an alternative to the gate valve and the orifice. As mentioned above, the amount of cooling water is determined by the pressure difference between the discharge pipe and the inflow pipe, but in the case of a centrifugal pump, the pressure difference increases near the deadline and the amount of cooling water increases, but the current used by the motor decreases. As a result, the heat generation amount also decreases. During operation with a large amount of water, the pressure difference decreases and the amount of cooling water decreases, but conversely the calorific value increases. Since the cooling effect and the heat generation amount are reversed as described above, by providing a constant flow valve 25 in the cooling pipe 19 as shown in FIG. 9, the cooling water amount is kept constant and the cooling effect is improved, and the cooling water recirculation is performed. Energy loss due to can be minimized.
[0021]
FIG. 10 is a diagram showing a modification of the reference example shown in FIG. In the example shown in FIG. 10, a plurality of pumps are provided, the cooling device is configured by the method shown in FIG. 4, and a constant flow valve 25 is installed in each cooling pipe 19 of the cooling device. A method of installing one constant flow valve in the cooling pipe is also conceivable, but in this case it is necessary to provide a constant flow valve that secures the amount of water required for cooling the number of units, considering that two or more pumps operate simultaneously. There is a disadvantage in terms of energy loss. Therefore, in this apparatus, energy loss can be further suppressed by installing the constant flow valve 25 that secures the amount of water necessary for cooling one unit before the cooling pipes 19 from the respective pumps merge.
[0022]
FIG. 11 is a diagram showing another reference example of the present invention. In the reference example shown in FIG. 11, the cooling pipe 19 branched from the discharge pipe 10 is further branched into a plurality of small pipes 26. The small pipes 26 are embedded in the radiator 18, merged again, and returned to the inflow pipe 9. ing. As a result, the same flow rate as that of one large-diameter cooling pipe is ensured, the radiator 18 is made compact, and the cooling pipe having a large total surface area passes in the vicinity of the heating element 17, so that the cooling effect is improved. Moreover, in the reference example shown in FIG. 11, the desorption apparatus 27 is provided in the connection part of the cooling piping 19, the discharge piping 10, and the cooling piping 19 and the inflow piping 9, respectively, and the maintainability is improved.
[0023]
【The invention's effect】
As described above, according to the present invention, the pump device can be covered with a cover having a sealed structure, and propagation of noise and vibration of the pump device to the outside of the cover can be blocked. Moreover, since the temperature rise in the cover is small, it is possible to provide a pump device that is excellent in durability and excellent in maintenance and maintenance.
[Brief description of the drawings]
FIG. 1 is a front view showing the overall structure of a reference example of a low-noise pump device according to the present invention.
FIG. 2 is a front view showing an overall configuration of a cooling device in the low noise pump device according to the present invention.
FIG. 3 is a front view showing a configuration of a cooling device when a plurality of pumps are installed in the low-noise pump device according to the present invention.
FIG. 4 is a front view showing a configuration of another cooling device when a plurality of pumps are installed in the low noise pump device according to the present invention.
5 is a front view showing a modified example of the reference example shown in FIG. 4, which is an embodiment of the low noise pump device according to the present invention .
6 is a front view showing another modification of the reference example shown in FIG. 4; FIG.
FIG. 7 is a front view showing an embodiment in the case of suppressing energy loss due to cooling water circulation in the low noise pump device according to the present invention.
FIG. 8 is a front view showing a modification of the embodiment shown in FIG.
FIG. 9 is a front view showing another modification of the embodiment shown in FIG. 7;
10 is a front view showing a modification of the reference example shown in FIG. 4. FIG.
FIG. 11 is a front view showing the configuration of another cooling device when a plurality of pumps are installed in the low noise pump device according to the present invention.
FIG. 12 is a cross-sectional view showing a conventional pump device.
[Explanation of symbols]
8 Pump 9 Inflow pipe 10 Discharge pipe 11 Base 12 Control part 14 Control device 15 Cover 16 Electric motor 17 Heating element 18 Heat dissipating body 19 Cooling pipe 20, 21, 23 Check valve 24 Orifice 25 Constant flow valve 26 Small pipe 27 Desorption device

Claims (3)

In the pump apparatus having a plurality of pump rotationally driven by an electric motor, and pipes for directing fluid to the pump, and a control device for controlling the pump,
The pump, the piping, and the control device are housed in a sealed cover,
The pump is an all-around flow type inline pump having a built-in electric motor and having a flow path on the entire outer periphery thereof,
The control device is arranged to be cooled by cooling water in a cooling pipe branched from the main pipe of the pump, and one end of the cooling pipe is a pump discharge port of the discharge pipe and a check valve installed downstream thereof. Connected in between, the other end is connected to the inflow pipe,
Wherein an electromagnetic valve is provided in the cooling piping, the starting of the pump the opening and closing of the solenoid valve, in conjunction with the stop,
The cooled diaphragm Ri mechanism provided in the piping, low noise pump device being characterized in that to adjust the amount of water in the cooling water. In the pump apparatus as in claim 1, wherein the cooling provided constant flow valve in the piping, low noise pump device being characterized in that to keep the flow rate of the cooling water constant.   2. The pump apparatus according to claim 1, wherein a number corresponding to the number of the pumps is provided for the cooling pipe.

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