JPS58203340A - Hot water feeder - Google Patents

Abstract

PURPOSE:To reduce registance against the flow of mixed water in a mixing section by a method wherein a flow rate detecting means having the function of agitating the mixed water is provided between a mixing valve and a temperature detecting means arranged on the downstream side of the valve in the hot water feeder which is adopted to feed hot water by mixing high temperature water and ordinary temperature water to a desired set temperature. CONSTITUTION:When a faucet 109 is opened after setting the required temperature by a setting knob, an impeller 13 having a magnet 112 fixed thereto begins to rotate and the rotation of the impeller is detected by a magnetic detecting element 114. At the same time, a burner 117 begins to burn and the high temperature water from a hot water pipe 106 and the ordinary temperature water from a feed water pipe 103 flow into the mixing valve 105 so that both waters are mixed and supplied. When the mixed water flows out from the mixing valve and passes an impeller type flow rate switch 111, it is further mixed uniformly by the rotation of the impeller 113. When the mixed water is supplied, the temperature sensor 110 detects the temperature of the mixed water at all times and when the temperature of the mixed water is lower than the value value set by the setting knob, a motor 107 is operated so as to increase the flow rate ratio of the hot water temperature flowing into the mixing valve 105 from a hot water pipe 116, to thereby increase the temperature of the mixed water. On the other hand, when the condition is reversed, the motor 107 is operated so as to reduce the flow rate ratio of the high temperature water to the mixing valve 105 from the pipe 116, to thereby lower the temperature of the mixed water to be supplied and as a result, the mixed water is always supplied at a desired temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater that mixes high-temperature water and ordinary water to a desired set temperature and supplies hot water.

Conventionally, this type of water heater has been constructed as shown in FIG. That is, in FIG. 1, 1 indicates a heat source device, and inside the heat source device 1 there is a water supply pipe 3 to which a city water pipe 2 is piped, and the water supply pipe 3 is branched into a heat exchanger 4 side and a mixing valve 5 side. It is plumbed. Further, a flow rate switch 6 for detecting the presence or absence of flow is provided on the upstream side of the branch pipe.

Hot water pipe 7 from heat exchanger 4 is piped to mixing valve 5 . The mixing ratio of high-temperature water and ordinary water by the mixing valve 5 is adjusted by driving the motor 8.

Now, the mixed water mixed by the mixing valve 5 is supplied from the faucet 1o via the hot water supply pipe 9, and the hot water supply pipe 9 is equipped with a temperature sensor 11 which is a means for detecting the temperature of the mixed water mixed by the mixing valve 5.
is provided. Further, a stirring section 13 made up of a plurality of fixed plates 12 is provided between the temperature sensor 11 and the mixing valve 5, thereby configuring a water heater. 14 is a control box, and 15 is a signal line. 16 is a burner.

Next, the operation will be explained. When the required temperature of mixed water is set by a setting immitter (not shown) and the faucet 10 is opened, the flow rate switch 6 detects the flow, the burner 16 starts combustion, and the mixing valve 6, high-temperature water from the hot water pipe 7 side and regular water from the water supply pipe 3 side flow, and the mixed water is supplied as hot water. At this time, the temperature sensor 11 constantly detects the temperature of the mixed water, and when the hot water temperature is lower than the setting value of the setting knob, the motor is activated so that the flow rate ratio of high temperature water from the hot water pipe to the mixing valve 5 is increased. 8 is driven to raise the hot water temperature. Conversely, when the hot water supply temperature is higher than the setting value of the setting knob, the motor 8 is driven so that the flow rate ratio of high temperature water from the hot water pipe 7 to the mixing valve 5 is reduced, lowering the hot water supply temperature and achieving the desired temperature. It can be used to supply hot water.

In this manner, the conventional water heater is provided with an agitation section 13 made up of a plurality of fixed plates 12 downstream of the mixing valve 5 in order to eliminate temperature unevenness of the mixed water, and a flow rate switch 6 is also installed in the piping. This has the disadvantage that the flow path resistance increases unnecessarily, and that the water supply pipe 3 and the hot water pipe 7 must be made thicker in order to supply more hot water.

The present invention solves these conventional drawbacks and aims to provide a means for reducing the flow path resistance of a stirring section for mixed water.

In order to achieve the above object, the present invention provides a flow rate detection means having an action of stirring the mixed water between the temperature detection means provided on the downstream side of the mixing valve.

With this configuration, the flow rate detection means has the function of stirring the mixed water and the function of a flow rate switch, so the flow rate switch 6 is not required, and the flow path resistance can be reduced.

Next, one embodiment of the present invention will be described based on FIG. 2. In FIG. 2, 101 indicates a heat source device, and heat source device 1
01 has a water supply pipe 103 to which a city water pipe 102 is connected, and the water supply pipe 103 is connected to the heat exchanger 104 side and the mixing valve 105.
There is branch piping on the side. A hot water pipe 106 from the heat exchanger 104 is connected to the mixing valve 105. The mixing ratio of high temperature water and ordinary water by this mixing valve 105 is adjusted by driving a motor 107. Now, the mixed water mixed by the mixing valve 105 is supplied from the faucet 109 via the hot water supply pipe 108, and the hot water supply pipe 108 is equipped with a temperature sensor 110 which is a means for detecting the temperature of the mixed water mixed by the mixing valve 105. It is provided.

A blade wheel type flow rate switch 111, which is a flow rate detection means, is provided between the twisted temperature sensor 110 and the mixing valve 106. The blade wheel type flow rate switch 111 includes a blade wheel 113 to which a magnet 112 is fixed, and a magnetic detection element 114 that detects rotation of the blade wheel 113. 115 is a control box, and 116 is a signal line. 1
17 is a burner that is controlled by the blade wheel type flow rate switch 111.

Next, to explain the operation of the above configuration, when the temperature of the required mixed water is set using a setting knob (not shown) K and the faucet 109 is opened, the impeller 1 to which the magnet 112 is held
13 starts rotating. The magnetic detection element 114 detects this rotation, the burner 117 starts combustion, and high-temperature water from the hot water pipe 106 side and ordinary water from the water supply pipe 103 side flow into the mixing valve 105, forming mixed water. Hot water is supplied. Mixing valve 10
When the mixed water discharged from 5 passes through the impeller type flow rate switch 111, it is uniformly mixed by the rotation of the impeller 113. During hot water supply, the temperature sensor 110 constantly detects the temperature of the mixed water, and when the hot water supply temperature is lower than the setting value of the setting knob, the flow rate ratio of high temperature water from the hot water pipe 116 to the mixing valve 106 is increased. The motor 1 is driven to raise the hot water temperature.

When the hot water supply temperature is higher than the setting value of the setting knob, the motor 107 is driven so that the flow rate ratio of high temperature water from the hot water pipe 116 to the mixing valve 105 is reduced, and the hot water supply temperature is lowered to reach the desired temperature. It can supply hot water.

Therefore, in this embodiment, since the mixed water is made uniform while rotating the impeller 113, the flow resistance becomes smaller than when the mixed water is made uniform by a fixed plate.

Further, since the rotation is detected by the magnet 112 and the magnetic detection element 114, the flow rate can be detected without being affected by water stains in the piping or changes in the hot water supply temperature. Note that, in addition to the burner 117, a pump or the like may be controlled by the blade wheel type flow rate switch 111, depending on the type and system of the heat source device.

As is clear from the above description, the water heater of the present invention includes:
Temperature detection means for detecting the temperature of the mixed water is provided downstream of a mixing valve for mixing high-temperature water and ordinary water, and a stirring action for the mixed water is provided between the mixing valve and the temperature detection means. By providing the flow rate detection means, the following effects can be obtained.

(1) Since the flow rate detection means has both the function of equalizing the mixed water and the function of detecting the flow rate, there is no need to provide a stirring section or a flow rate switch, and costs can be reduced.
(2) Since there is no need to separately provide a flow rate switch, flow path resistance can be lowered, and there is no need to increase the diameter of the water supply pipe or hot water pipe.

In addition to the above-mentioned embodiments, the blade wheel type flow rate switch according to the present invention includes a propeller type, a turbine type, and the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional water heater, and FIG. 2 is a block diagram showing a water heater in an embodiment of the present invention. 105... Mixing valve, 110... Temperature detection means (temperature sensor), 111... Flow rate detection means (blade wheel type flow rate switch), 112... magnet,
113... Impeller, 114... Magnetic detection element. Name of agent: Patent attorney Toshio Nakao and 1 other person11

Claims (3)

[Claims] (1) A temperature detection means, a mixing valve controlled by a signal from the temperature detection means, and a flow rate detection means that has an agitating effect on the mixed water mixed by the mixing valve and detects the flow rate thereof. A hot water supply apparatus comprising: the temperature detecting means disposed downstream of the mixing valve, and the flow rate detecting means disposed between the mixing valve and the temperature detecting means. (2) The water heater according to claim 1, wherein the flow rate detection means is constituted by a blade wheel type flow rate switch. (3) The water heater according to claim 2, wherein the impeller-type flow rate switch is constituted by a impeller to which a magnet is fixed and a magnetic detection element that detects the rotation of the impeller.