JP2007085127A - Auxiliary pressure device for feedwater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary pressure device for feedwater which prevents a drop in the suction pressure of a feedwater auxiliary pump caused by a narrow diameter of a water service pipe. <P>SOLUTION: The auxiliary pressure device for feedwater has a preventing means 30 on the primary side of a back flow preventing section of the feedwater auxiliary pump 17 having a feedwater capacity larger than that of the water service pipe 1, for preventing a drop in the suction pressure during pumping operation which is carried out when water consumption is larger than a water discharge quantity of the feedwater auxiliary pump 17. Thus the drop in the suction pressure caused by constraints of application of the narrow service water pipe 1 can be avoided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water supply auxiliary pressurizing device used for, for example, auxiliary pressurization of a water supply pressure of a water distribution pipe.

  House water supply is mainly dependent on the water supply pressure of the water main. However, when it becomes a house on the second floor, the third floor or higher floors, the water supply pressure of the water main is limited, so it is not possible to secure a sufficient amount of water up to the upper floor with only the water supply pressure from the water main. Sometimes.

  Therefore, for example, when adding to the second floor and the third floor, a water supply auxiliary pressurizing device that supplementarily pressurizes the water supply pressure is incorporated into a part of the existing water distribution pipe drawn from the water main, The supply water pressure is secured. Most of the water supply auxiliary pressurizing devices use a structure using a water supply auxiliary pump having a check valve (a backflow prevention unit) for preventing a backflow to the water main on the suction side and having a variable water supply capacity.

  At present, a water supply pipe having a diameter of 20 mm is usually used as a water supply pipe drawn from the water main. However, in the case of an old house, a water pipe that is thinner than the water pipe used in the current house may be used. For example, in an old house, a water pipe with a thin diameter of 13 mm may be used.

  The water supply auxiliary pump is unitized so as to have a water supply capacity corresponding to the current water pipe. For this reason, in the case of an old house, for example, a water supply auxiliary pump having a large water supply capacity exceeding the water supply capacity of the water supply pipe (for example, a capacity for a 20 mm diameter) is assembled to a water supply pipe that supplies water with a 13 mm diameter. An unbalanced combination occurs.

  By the way, a water distribution pipe having a diameter of 20 mm that is currently used has a capacity that can sufficiently tolerate the amount of water used for a device that instantaneously uses a large amount of water, such as a tankless toilet. On the other hand, the water distribution pipe with a 13 mm diameter used in old houses is inferior to that.

  For this reason, the problem which was not seen in the combination of the water supply pipe of the present caliber (for example, 20 mm) and the water supply auxiliary pump suitable for the water supply pipe, that is, the water supply required for the upper floor by the installation of the water supply auxiliary pressure device Although the amount is secured, on the other hand, because the water distribution pipe is thin, if a large amount of water is used instantaneously, such as a tankless toilet, the amount of water used will be greater than the amount of water discharged from the water supply auxiliary pump. There is a problem that a large drop in suction pressure occurs near the suction side of the water supply auxiliary pump.

Normally, when using a 20 mm water pipe and pressurizing with a water supply auxiliary pump with a water supply capacity corresponding to the same diameter, the above problem does not occur because there is a margin in the amount of water supplied from the water pipe. No countermeasure is seen (see Patent Document 1).
JP-A-7-54382

  In other words, the auxiliary pressurization for thin water distribution pipes, when a large amount of water is used instantaneously, a large pressure drop due to the water distribution pipe itself is inevitable. And the water mains may be affected.

  Then, the objective of this invention is providing the water supply auxiliary | assistant pressurization apparatus which can prevent the fall of the suction pressure of a water supply auxiliary | assistant pump by the factor that a water distribution pipe is thin.

  In order to achieve the above object, the invention of claim 1 is provided when the amount of water used is larger than the discharge water amount of the water supply auxiliary pump on the primary side of the backflow prevention unit of the water supply auxiliary pump having a larger water supply capacity than the water pipe. The suppression means which suppresses the fall of the suction pressure of a water supply auxiliary pump was provided.

  The invention of claim 2 employs an accumulator as the restraining means so that a simpler structure can be used.

  According to the first aspect of the present invention, the suppression means suppresses a reduction in the suction pressure caused by the restriction that a thin water pipe is used during operation of the water supply auxiliary pump.

  Therefore, even if a large amount of water is used instantaneously through a thin water distribution pipe, it is not necessary to affect the water distribution pipe or the water main.

  According to the second aspect of the present invention, in addition to the above effects, there is an effect that it is possible to cope with a decrease in suction pressure with a simple structure.

[One Embodiment]
Hereinafter, the present invention will be described based on an embodiment shown in FIG.

FIG. 1 shows a water supply system A of a house in which, for example, a water supply auxiliary pressure device is incorporated. In the figure, 1 is a water main from a water main (not shown), here, for example, a water distribution pipe drawn into a three-story house 2, 3 is branched from the water pipe 1 to each floor, and various faucets and toilets ( For example, a branch pipe connected to a demand section (not shown) such as a tankless) is shown. For the water distribution pipe 1, for example, a pipe member having a diameter of 13 mm is used (for an old house).
On the other hand, 10 is a water supply auxiliary pressure device. For example, a structure in which a pump unit 11 and a bypass module 20 are combined is used for the water supply auxiliary pressure device 10. Of these, the pump unit 11 has a structure in which a pumping structure is housed inside a casing 14 in which, for example, a flanged suction port 12 and a flanged discharge port 13 are formed. In the pumping structure, for example, an auxiliary water supply pump 17 driven by an electric motor 16 and an accumulator 18 for discharge pressure are assembled in this order from the upstream side to a flow path 15 extending between the suction port portion 12 and the discharge port portion 13. Structure is used.

  The bypass module 20 includes a bypass passage 21 between the suction port portion 12 and the discharge port portion 13 via the connection pipe portions 21 a and 21 b, and a connection pipe from the suction side end of the bypass passage 21. A suction port body 12a extending toward the side opposite to the portion 21b, a discharge port body 13a extending from the discharge side end of the bypass path 21 toward the side opposite to the connecting pipe portion 21a, the bypass path 21 and the suction port body Switching valve assembled at a portion where 12a and connecting pipe portion 21b intersect, for example, an electric three-way switching valve 23a, a switching valve assembled at a portion where bypass passage 21, discharge port 13a and connecting tube portion 21a intersect. For example, a structure having an electric three-way switching valve 23b and a check valve 21c for preventing a backflow interposed in the middle of the bypass passage 21 is used. Then, the check valve 21c and the three-way switching valves 23a and 23b provide a path from the suction port body 12a to the discharge port body 13a through the water supply auxiliary pump 17 (a path passing through the pump), and a suction port indicated by a one-dot chain line arrow. The path is switched from the body 12a to the discharge port body 13a through the bypass path 21 (short-circuit path not passing through the pump). Further, for example, a check valve 24 is interposed in the connection pipe portion 21b on the suction side as a backflow prevention portion. Thus, the check valve 24 is assembled on the suction side of the water supply auxiliary pump 17.

  The water supply auxiliary pressurizing device 10 is a product that conforms to the current specification, that is, a product having a water supply capability capable of appropriately pumping tap water when a water pipe having a diameter of 20 mm is used.

  This water supply auxiliary pressurizing device 10 is a part of the water supply system A composed of a water supply system different from the original water distribution pipe (diameter 20 mm), that is, a thin water pipe 1 (diameter 13 mm) (midway). It is built in. Specifically, the water distribution pipe 1 is divided into a house 2 side and a water main (not shown) side, and is connected to, for example, a screw connection at the end of the water pipe section 5 on the divided house 1 side. The end of the discharge port body 13a of the auxiliary water supply pressurizing device 10 is connected. Moreover, the edge part of the suction inlet 12a of the water supply auxiliary | assistant pressurization apparatus 10 is connected to the edge part of the water distribution pipe part 6 by the side of a water main, for example by screw connection. In the figure, reference numerals 1a and 1b denote these connecting portions. By installing this water supply auxiliary pressurizing device 10, the water supply pressure of the water distribution pipe 1 is supplementarily increased by the water supply auxiliary pump 17, and the tap water is supplied to each upper floor (second floor, third floor). I am doing so. Of course, the operation of the water supply auxiliary pump 17 is performed while changing the capacity according to the water supply pressure of the water distribution pipe 1. That is, the water supply auxiliary pump 17 is operated only when the water supply pressure is insufficient. At other times, the operation is stopped, and the tap water from the water main is supplied to each branch pipe 3 directly (without passing through the water supply auxiliary pump 17) through the bypass 21. Of course, the check valves 21c and 24 prevent the tap water from flowing back from the pump side (housing side) to the water main side. In the figure, reference numeral 27 denotes a check valve assembled on the discharge side of the water supply auxiliary pump 17, and an on-off valve 28 is assembled adjacent to the check valve 27.

  An accumulator 30 is connected as a suppression means to the suction port body 12a on the suction side of the water supply auxiliary pressurization device 10, specifically, the primary side (inlet side) of the check valve 24. The accumulator 30 is a large-capacity accumulator. Thus, the tap water is stored in the accumulator 30 at the water supply pressure of the water main (not shown). The accumulator 30 has a large capacity, for example, a 20 L accumulator. The accumulator 30 has a function of suppressing a reduction in suction pressure that occurs when a large amount of water is used instantaneously.

  The suppression of the decrease in the suction pressure will be described. It is assumed that, for example, the water supply auxiliary pump 17 is operated to supplement the water supply pressure. Then, the tap water sent to the pump unit 11 through the water distribution pipe part 6, the suction port body 12a, the three-way switching valve 23a, the check valve 24 and the suction port part 12 is further pressurized by the water supply auxiliary pump 17, Water supply pressure is sufficient to distribute water to each upper floor. The auxiliary pressurized tap water is sent to each branch pipe 3 through the discharge port 13, the three-way switching valve 23 b, the check valve 27, and the on-off valve 28, and the demand section ( Used in faucets and toilets).

  At this time, for example, a tankless toilet is used. Then, a large amount of water is used instantly. At this time, since the diameter of the water distribution pipe 1 is thin and insufficient for the use of a large amount of water, a behavior occurs in which the amount of water used becomes larger than the amount of water discharged from the water supply auxiliary pump 17. In response to this behavior, the pressure on the suction side of the water supply auxiliary pump 17 during the pressurizing operation tends to drop instantaneously.

  At this time, since tap water has already been stored in the accumulator 30 at the pressure of the water main, the water supply assistance is performed from time to time depending on the suction pressure at which the pressurized tap water decreases. Supplyed (supplemented) to the suction side of the pump 17. Here, since the capacity | capacitance of the accumulator 30 is large, the fall of suction pressure is fully suppressed.

  From this, the fall of the suction pressure of the water supply auxiliary pump 17 which arises by the restriction | limiting of using the thin water distribution pipe 1 can be suppressed.

  Therefore, even if a large amount of water is used instantaneously by using the thin water distribution pipe 1, it is possible to prevent the water distribution pipe 1 and the water main (not shown) from being affected. In particular, in order to suppress the decrease in the suction pressure, since a large-capacity accumulator 30 is simply used, a simple structure is sufficient.

  The present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention.

The figure which shows the structure of the water supply auxiliary | assistant pressure apparatus which concerns on one Embodiment of this invention with the house in which the apparatus was assembled | attached.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Tap water distribution pipe, 10 ... Water supply auxiliary pressurization device, 17 ... Water supply auxiliary pump, 24 ... Check valve (backflow prevention part), 30 ... Accumulator (suppression means).

Claims (2)

Water supply auxiliary that pressurizes the water supply pressure of the water distribution pipe that distributes water to the house, has a water supply capacity larger than the amount of water that can be supplied by the water distribution pipe, and is provided with a backflow prevention unit that prevents backflow on the suction side A pump,
A water supply device provided on the primary side of the backflow prevention unit, and comprising suppression means for suppressing a reduction in suction pressure when the amount of water used becomes larger than the amount of water discharged from the water supply auxiliary pump during operation of the water supply auxiliary pump. Auxiliary pressure device.   2. The water supply auxiliary pressure device according to claim 1, wherein the suppression device is an accumulator.

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