JP2007263394A - Hot water pressurizing pump unit for hot water storage type hot water supply device and hot water storage type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a hot water supply pressure pump from being continuously driven and supplying hot water of high temperature when water supply is cut off while supplying hot water. <P>SOLUTION: This hot water supply pressure pump unit 1 comprising the hot water supply pressure pump 2 for pressure feeding and supplying hot water, a pressure switch 4 and a flow rate switch 5 for detecting stop of hot water supply, and a pressure pump control portion 8 outputting signals for start and stop of driving of the hot water supply pressure pump 2 on the basis of signals detected by the pressure switch 4 and the flow rate switch 5, further comprises a water supply pressure sensor 3 for detecting a pressure state at a primary side, of the hot water supply pressure pump 2, and the pressure pump control portion 8 stops the hot water supply pressure pump 2 on the basis of a detection signal of the water supply pressure sensor 3, thus the supply of hot water of high temperature caused by cutoff of water supply during supplying hot water, can be prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water supply pressure pump unit for a hot water storage type hot water supply apparatus and a hot water storage type hot water supply apparatus that supply hot water stored in a hot water storage tank by pumping the hot water.

  Conventionally, in this type, a hot water supply pressurizing pump unit 101 as shown in Patent Document 1 and FIG. 5 is known, and a hot water supply pressurizing pump 102 for pumping and supplying hot water and a constant flow rate are known. A flow switch 103 having a function of detecting, a pressure switch 104 having a function of detecting a constant pressure, a check valve 105 for preventing back flow of hot water pumped from the hot water pressurizing pump 102, and A pressurizing pump control unit 106 that outputs a signal for starting and stopping driving of the hot water supply pressurizing pump 102 based on the signals of the flow rate and the pressure value, and a suction pipe that is a pipe that sucks hot water into the hot water supply pressurizing pump 102. 107 and a discharge pipe 108 for feeding hot water from the hot water supply pressurizing pump 102 to the outside.

The driving of the hot water supply pressurizing pump unit 101 will be described. The pressurization pump control unit 106 supplies hot water based on a signal detected by the pressure switch 104 or a flow rate higher than a predetermined value by the flow switch 105. When the pressurizing pump 102 is driven, hot water from a hot water storage tank (not shown) is pumped, and the hot water tap is closed, the flow switch 103 in the hot water pressurizing pump unit 101 sets a flow rate value equal to or lower than a predetermined flow rate. The pressurization pump control unit 106 stops the hot water supply pressurization pump 102 based on a signal detected or a signal that the pressure switch 104 in the hot water supply pressurization pump unit 101 detects a pressure value equal to or lower than a predetermined pressure. It was a thing.
JP 58-47947 A

  By the way, in this conventional one, when a water outage occurs during hot water supply, the hot water tap is opened on the secondary side of the hot water pressurizing pump 102. Therefore, the pressure switch 104 or the flow switch 105 arranged on the secondary side of the pump is Continued detection of hot water supply status. Therefore, the hot water supply pressurizing pump 102 continues to be operated, while the water supply is in a stopped state, and thus there is a risk that only hot water continues to be discharged.

  Accordingly, in order to solve the above problems, the present invention provides a hot water pressurizing pump for pumping and supplying hot water, a switch unit for detecting hot water start and hot water supply stop, and a signal detected by the switch unit. The hot water pressurizing pump unit includes a pressurizing pump controller that outputs a drive start signal and a drive stop signal for the hot water pressurizing pump based on the hot water pressurizing pump. A sensor is provided, and the pressurization pump control unit stops the hot water supply pressurization pump based on a detection signal of the feedwater pressure sensor.

  According to a second aspect of the present invention, there is provided a hot water storage tank for storing hot water heated to high temperature by a heating means, a water supply pipe for supplying water to the hot water storage tank, and hot water supply for discharging hot hot water from the hot water storage tank. A hot water supply pressurizing pump for pumping and supplying hot water, a switch unit for detecting hot water start and hot water stop, and the hot water supply based on a signal detected by the switch unit. A pressurizing pump controller that outputs a signal for starting and stopping driving of the pressurizing pump, and a feed water pressure sensor that detects a pressure state on the primary side of the hot water pressurizing pump are provided, and the hot water pressurizing is performed by the feed water pressure sensor. The pressure state of the primary side of the pump is detected, and the pressurizing pump control unit stops the hot water supply pressurizing pump based on the signal that has detected the primary pressure state of the hot water pressurizing pump. It was decided.

  According to the present invention, even if there is a water break while discharging hot water from the hot water tap, the feed water pressure sensor reliably detects the water break on the primary side of the pump and pressurizes based on the signal from the feed water pressure sensor. Since the pump control unit stops the hot water supply pressurizing pump, the hot water supply pressurizing pump can be stopped during a water outage to prevent hot water from being discharged.

Next, an embodiment of the present invention will be described with reference to FIG.
1 is a hot water supply pressure pump unit, 2 is a hot water supply pressure pump for pumping and supplying hot water, 3 is a water supply pressure sensor for detecting the pressure state of the primary side of the hot water supply pressure pump 2, and 4 is constant. 5 is a flow switch having a function of detecting a constant flow rate, 6 is an accumulator for absorbing sudden pressure fluctuations, and 7 is hot water pumped from a hot water pressurizing pump. Is a check valve for preventing back flow, and 8 is a signal for starting and stopping driving of the hot water supply pressurizing pump 2 based on the flow rate detected by the flow rate switch 5 and the pressure signal detected by the pressure switch 4. 9 is a suction pipe which is a pipe on the side for sucking hot water into the hot water pressurizing pump 2, and 10 is a discharge pipe for sending hot water from the hot water pressurizing pump 2 to the outside. Here, the pressure switch 4 and the flow rate switch 5 were used as a switch part for detecting hot water supply start and hot water supply stop.

Next, a hot water storage type hot water supply apparatus that is a hot water supply source of the hot water supply pressurizing pump unit 1 will be described with reference to FIG.
11 is a hot water storage tank unit, 12 is a heat pump unit which is a heating means, 13 is a hot water tap for discharging hot water stored in the hot water storage tank unit, and 14 is a hot water storage tank for storing heated hot water.

  Reference numeral 15 is a heat pump forward pipe for sending heated water from the lower part of the hot water storage tank 14 to the heat pump unit 12, 16 is a heat pump return pipe for sending heated water from the heat pump unit 12 to the upper part of the hot water storage tank 14, and 17 is the inside of the hot water storage tank 14. Is a heat pump circulating pump provided on the heat pump forward pipe 15.

  18 is a water supply pipe for supplying hot water and hot water supply water, 19 is a pressure reducing valve for reducing the water supply pressure to the hot water storage tank 14 to a constant pressure, and 20 is a hot water outlet for storing hot water stored in the hot water storage tank 14. The hot water supply pipe 21 is a hot water mixing valve 21 which mixes the water supplied from the water supply pipe 18 and the hot water supplied from the hot water pipe 20 to a set temperature, and 22 is provided downstream of the hot water mixing valve. A hot water temperature sensor 23 detects the temperature, and 23 is a hot water flow rate counter for counting the amount of hot water. The hot water supply pressure pump unit 1 is provided downstream of the hot water supply flow rate counter 23.

  Next, the operation of the hot water storage type hot water supply apparatus according to this embodiment will be described with reference to the flowchart of FIG.

  First, the water supplied to the hot water storage tank 14 through the water supply pipe 18 is sent from the lower part of the hot water storage tank 14 to the heat pump unit 12 through the heat pump forward pipe 15 by the heat pump circulation pump 17. Hot water is stored in the hot water storage tank 14 by the return pipe 16.

  When the hot water supply pressurization pump 2 starts to be driven, as shown in the flowchart of FIG. 3, the pressure is increased from a certain value in the hot water supply pressurization pump unit 1 in step S1 (hereinafter referred to as S1. Is detected by the pressure switch 4 (YES in S1), or when the flow switch 5 detects that a certain flow rate of hot water has flowed in S2 (YES in S2), the process proceeds to S3. The signal detected by the advance pressure switch 4 and the flow rate switch 5 is sent to the pressurizing pump control unit 8, and the pressurizing pump control unit 8 drives the hot water supply pressurizing pump 2 to pressurize the hot water to the third floor or high place. Hot water is supplied.

  At the time of this hot water supply, the hot water storage tank unit 11 adjusts the temperature of the hot water from the hot water storage tank 14 and the water from the water supply pipe 18 to the hot water supply set temperature by the hot water supply mixing valve 21, Is hot water being supplied.

  And during the hot water supply, the hot water supply pressure pump 2 is operated as follows. Usually, the feed water pressure sensor 3 indicates a value larger than a predetermined pressure (for example, positive pressure) (YES in S4), and the running water switch 5 detects that the running water is above a certain value (YES in S5). When hot water is supplied, the hot water supply pressurizing pump 2 is operating normally. When the hot-water tap 13 is stopped, hot water does not flow, so the flow rate switch 5 does not detect a flow rate above a certain flow rate, so the hot water supply pressure pump is stopped (NO in S4).

  Further, when the water supply pressure sensor 3 detects a predetermined pressure value (eg, negative pressure) or less during hot water supply in S4, the primary side of the hot water supply pressurization pump 2 is considered to be in a water cutoff state, and the detected signal is pressurized. It sends to the pump control unit 8, and the pressurization pump control unit 8 performs control to stop the hot water supply pressurization pump 2.

  As a result, hot water is not suddenly supplied even if there is water interruption during hot water supply, so there is no fear of the user getting burned and hot water can always be supplied safely.

  FIG. 4 shows another embodiment of the present invention. In the previous embodiment, the heat pump unit 12 is provided as the heating means, but in the embodiment shown in FIG. 4, the electric heater 24 is provided as the heating means. Further, in the previous embodiment, the hot water supply pressure pump unit 1 is provided outside the hot water storage tank unit 11, but in the embodiment shown in FIG. 4, the hot water supply pressure pump 2 and the water supply pressure sensor are provided inside the hot water storage tank unit 11. 3, a pressure switch 4, a flow rate switch 5, and an accumulator 6. In this case, when the hot water storage tank unit 11 is manufactured, the hot water supply pressure pump 2, the water supply pressure sensor 3, the pressure switch 4, the flow rate switch 5, and the accumulator 6 are provided in the hot water storage tank unit 11. Therefore, it is not necessary to construct the hot water storage tank unit 11 and the hot water supply pressure pump unit 1 separately, and the labor of construction can be saved. In addition, since it is not necessary to install the hot water supply pressure pump unit 1 outside the hot water storage tank unit 11, the external space can be reduced.

  In the above embodiment, the pressure switch 4 and the flow rate switch 5 are switch units for starting and stopping hot water supply. However, only one of them can be used as the switch unit. As long as it has a function of detecting the start of hot water supply and the stop of hot water supply and turning the switch on and off based on the value, such as a pressure switch.

The schematic block diagram of the hot water storage type hot water supply apparatus which shows one Embodiment of this invention The principal part enlarged view of the hot water storage type hot water supply apparatus which shows one Embodiment of this invention Flow chart showing operation of the hot water pressurizing pump The schematic block diagram of the hot water storage type hot water supply apparatus which shows another embodiment of this invention Hot water pressurizing pump unit for conventional hot water storage hot water supply system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply pressure pump unit 2 Hot water supply pressure pump 3 Water supply pressure sensor 4 Pressure switch 5 Flow rate switch 8 Pressure pump control part 11 Hot water storage tank unit 12 Heat pump unit 13 Hot water tap 14 Hot water storage tank

Claims (2)

  Hot water pressurizing pump for pumping and supplying hot water, a switch unit for detecting hot water start and hot water stop, and driving start and drive stop of the hot water pressurizing pump based on signals detected by the switch unit In the hot water pressurizing pump unit including the pressurizing pump control unit, a hot water pressure sensor for detecting a pressure state on a primary side of the hot water pressurizing pump is provided, and the pressurizing pump is based on a detection signal of the feed water pressure sensor. A hot water supply pressure pump unit for a hot water storage type hot water supply apparatus, wherein the control unit stops the hot water supply pressure pump.   A hot water storage tank comprising a hot water storage tank for storing hot water heated to a high temperature by a heating means, a water supply pipe for supplying water to the hot water storage tank, and a hot water supply pipe for discharging hot hot water from the hot water storage tank In the unit, a hot water pressurizing pump for pumping and supplying hot water, a switch unit for detecting hot water start and hot water supply stop, and driving of the hot water pressurization pump based on a signal detected by the switch unit And a pressurizing pump controller for stopping the driving and a hot water pressure sensor for detecting a pressure state of the hot water supply pressure pump primary side, and detecting a primary pressure state of the hot water pressure pump by the feed water pressure sensor. The hot water storage type hot water supply is characterized in that the pressurization pump control unit stops the hot water supply pressurization pump based on a signal detecting a pressure state on the primary side of the hot water supply pressurization pump. Location.

Images