JP4302654B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus including a hot water supply heat exchanger in which a hot water supply pressure is applied to a hot water storage hot water storage can that is open to the atmosphere without applying a hot water supply pressure to the hot water storage can.

Conventionally, this type of open-type hot water supply device uses a mechanical ball tap valve to cut the edge of the water supply and open the hot water storage can to the atmosphere, eliminating the restriction of the operating pressure, and the material and structure of the hot water storage can Was made cheap. (For example, see Patent Document 1)
Japanese Utility Model Publication No. 60-35004

  By the way, in this conventional one, since the hot water stored in the hot water storage can is directly used for hot water supply, a hot water pressurizing pump is necessary, and since it is a hot water storage type, there is a problem in terms of hygiene and positively. It was something that was never used.

The present invention pays attention to this point, and in order to solve the above-described drawbacks, in particular, the structure thereof is a hot water storage can body for storing hot water heated by a heating means, and the hot water storage can body includes at least a water supply electromagnetic valve. A pipe is connected, and this water supply solenoid valve is opened and closed according to the water level by means of a water level detection means for detecting the water level in the hot water storage can, and an air release chamber is formed above the hot water storage can. The hot water storage can is provided with a hot water heat exchanger in which one is connected to the water supply pipe and the other is connected to the hot water supply pipe, and the supply pipe is further provided with two check valves from the hot water storage can body side. It is provided with a backflow water release valve that is closed by water pressure and opened to the atmosphere by negative pressure due to water cutoff .

According to the present invention, the inside of the hot water storage can can be kept open to the atmosphere by controlling the opening and closing of the water supply solenoid valve by the water level detection means, which is reliable and can be used safely without any fear of malfunction. Since the shape is flat, it can be easily installed in a small gap without taking up installation space, and hot water is supplied via a hot water heat exchanger that exchanges heat with hot water in the hot water storage can. It is unnecessary and is hygienic and can be used with peace of mind.
Furthermore, since the supply pipe has two check valves and a water supply solenoid valve is provided on the upstream side thereof, the back flow of hot water in the hot water storage can is reliably prevented, and also due to water breakage or the like. Negative water is shut off by the water supply solenoid valve, but when water is supplied, the backflow water release valve opens when the water supply pressure disappears, and the negative pressure is eliminated, so backflow is reliably prevented. Is.

Next, an embodiment of the hot water supply apparatus of the present invention will be described.
1 is a hot water storage can body for storing hot water, 2 is a heat pump unit as a heating means for heating hot water, and 3 is a bathtub.

  Reference numeral 4 denotes a heating circulation circuit that connects the hot water storage can 1 and the heat pump unit 2 so as to be circulated. The heating circulation circuit 5 has a heating circulation pump 5 and is connected to the lower portion of the hot water storage can 1 and the upper portion of the hot water storage can 4. The heat pump return pipe 4b is used to heat the cold water in the lower part of the hot water storage can body 1 by the heat pump unit 2 via the heat pump forward pipe 4a, and the heated hot water is heated to the upper part of the hot water storage can body 1 by the heat pump return pipe 4b. The hot water is heated and stored in the hot water storage can body 1 by returning. The hot water storage can body 1 has a plurality of hot water storage temperature sensors 6a, 6b, 6c, 6d, 6e, 6f, 6g vertically on the outer peripheral surface, and this hot water storage temperature sensor detects a predetermined temperature or more. This is to detect the amount of hot water stored.

  Reference numeral 7 is a supply pipe for supplying water to the hot water storage can body 1. In the middle, the backflow water release is closed from the hot water storage can body 1 side by two check valves 8 and 9 and the water supply pressure and the air is released to the atmosphere by a negative pressure due to water cut off. A valve 10 and a water supply electromagnetic valve 11 for controlling the start and stop of water supply are provided as one set. An electromagnetic valve 12 for abnormal shutoff and a pressure reducing check valve 13 are provided on the water supply side of the water supply electromagnetic valve 11. Is provided.

  Reference numeral 14 denotes a water level detecting means comprising two electrodes suspended inward from the upper end of the hot water storage can body 1. In order to store 370 L, when the amount of hot water decreases, this is detected and the water supply electromagnetic valve 11 is opened. Water is replenished, and when it reaches a predetermined amount, this is detected and the water supply solenoid valve 11 is closed to stop water replenishment. Between the uppermost surface of the hot water and the upper end surface of the hot water storage can 1, An air release chamber 16 that is open to the atmosphere via an air vent pipe 15 is formed.

  Reference numeral 17 denotes a bellows-type heat exchanger for hot water supply provided by hanging the hot water stored in the hot water storage body 1 from the lower part to the upper part, and a water supply pipe 19 having one end directly connected to the water pipe 18 upstream from the pressure reducing check valve 13. The other end is connected to a hot water supply pipe 21 provided with a faucet 20 at the tip thereof to supply hot water at a hot water supply pressure. The hot water supply pipe 21 includes a flow switch 22, a flow counter 23, A hot water supply thermistor 24, a hot water supply mixing valve 25, and a hot water temperature sensor 26 are provided, and a hot water supply bypass pipe 27 branched from the water supply pipe 19 is connected to the hot water supply mixing valve 25 so that hot water and hot water are supplied at a set temperature. To be mixed and supplied.

  A bath heat exchanger 28 is located in the hot water in the upper part of the hot water storage can body 1 and communicates with the bathtub 3 through the bath outlet pipe 29 and the bath return pipe 30 to keep the bath warm and recharge. This circuit constitutes a circuit 31. In this bath circulation circuit 31, a water level sensor 32, a bath electric valve 33, a bath circulation pump 34, a circulation temperature thermistor 35, a bath flow switch 36, and a bypass path for the bath heat exchanger 28 are formed. A bath heat-retaining three-way valve 37 and a chasing detection thermistor 38 are provided.

  39 is a hot water filling circuit connecting the upstream side of the hot water supply mixing valve 25 of the hot water supply pipe 21 and the bath circulation circuit 31, a bath mixing valve 40 for mixing the hot water with the hot water and setting the bath set temperature, a hot water solenoid valve 41, A bath flow counter 42, a bath backflow opening valve 43, and two check valves 44 and 45 are provided.

Next, the operation of this hot water supply apparatus will be described below.
The hot water in the hot water storage can 1 is 90 ° C. in the next morning by using an inexpensive electric power contract such as hourly lamp contracts and late-night power, and circulating the heat pump unit 2 through the heating circuit 4 sequentially. 370L of hot water is stored.

  When the faucet 20 is opened, a hot water flow is generated by the hot water pressure in the hot water supply heat exchanger 17, and the hot water exchanged with the hot water in the hot water storage can 1 in the hot water heat exchanger 17 passes through the hot water supply pipe 21. The hot water temperature is detected by the hot water temperature sensor 26 and the hot water supply thermistor 24, and the amount of hot water and hot water mixed by the hot water mixing valve 25 is adjusted to supply hot water at a set temperature sequentially from the faucet 20.

  On the other hand, in the hot water storage can body 1, when the hot water storage hot water decreases, the water level detection means 14 detects this and opens the water supply electromagnetic valve 11, so that the water supply pressure is supplied from the supply pipe 7 to the bottom of the hot water storage can body 1 with the water supply pressure. When the hot water storage water level rises and reaches a predetermined water level, the water level detection means 14 detects this and closes the water supply electromagnetic valve 11 to stop water supply.

  The supply pipe 7 has two check valves 8 and 9, and a water supply electromagnetic valve 11 is provided on the upstream side thereof, so that the back flow of hot water in the hot water storage can 1 is reliably prevented. In addition, the negative pressure due to water shutoff is shut off by the water supply solenoid valve 11, but when water is supplied, the backflow water release valve 10 is opened when the water supply pressure disappears, and the negative pressure is eliminated. As a result, back flow is reliably prevented, and hot water supply that does not apply water supply pressure to the hot water storage can body 1 by controlling the water supply electromagnetic valve 11 while observing the water level of the hot water storage can body 1 by the water level detection means 14. Because it has been realized with a highly reliable configuration by eliminating the use of mechanical parts, the shape and material of the hot water storage can 1 can be easily changed and provided at low cost without worrying too much about the strength. It can be used safely without worry.

  Thus, hot water can be stored in the hot water storage can 1 opened to the atmosphere, and hot water that is heat-exchanged with the high temperature water can be used for hot water supply, so that a sanitary and safe hot water supply can be obtained. In addition, the hot water storage can body can be easily installed in a small gap without being restricted by the shape of the hot water storage can body and taking up installation space.

The schematic block diagram of one Embodiment of this invention.

Explanation of symbols

1 Hot water storage can body 2 Heat pump unit (heating means)
7 Supply pipe 11 Water supply solenoid valve 14 Water level detection means 16 Atmospheric open chamber 17 Heat exchanger 19 for hot water supply Water supply pipe 21 Hot water supply pipe

Claims (1)

A hot water storage can body for storing hot water heated by the heating means, and a supply pipe having at least a water supply electromagnetic valve communicated with the hot water storage can body, and this water supply electromagnetic valve detects the water level in the hot water storage can body. In the case where an open air chamber is formed in the upper part of the hot water storage can body, one is connected to the water supply pipe and the other is a hot water supply pipe. A hot water supply heat exchanger is provided , and the supply pipe is further provided with two check valves from the hot water storage can body side, and a backflow water release valve that is closed by the supply water pressure and opened to the atmosphere by the negative pressure due to the water cut off. Hot water supply device characterized by

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