JP2015169385A - hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems in which: in a conventional one, after water supply construction, dirty water in which rust of piping and sludge and the like mixed during construction are mixed flows into a pressure-reducing valve 10 and impurity such as sludge attaches to the pressure-reducing valve 10; and a plurality of pieces of opening/closing means are used, so that costs of components becomes high.SOLUTION: A three-way valve 12 which can switch between a flow passage of a water supply pipe 2 and a flow passage of a drain pipe 11 is provided on further upstream than a pressure-reducing valve 10 which is in the middle of the water supply pipe 2. The dirty water in which rust in piping and sludge and the like mixed during construction are mixed can be drained before attaching to the pressure-reducing valve 10, and also, a switching operation can be performed only by the three-way valve 12.

Description

  The present invention relates to a hot water storage type hot water supply apparatus having a hot water storage tank.

  Conventionally, in this type of hot water storage type hot water supply apparatus, water supplied from city water is heated by a heating means, warmed hot water is stored in a hot water storage tank or the like, and hot water in the hot water storage tank is supplied depending on the purpose of use.

However, the city water immediately after the construction of waterworks is dirty water mixed with rust of piping and sludge mixed during construction, and if it is supplied to the hot water storage tank as it is, the hot water storage tank will become dirty. Therefore, it was necessary to drain water until the dirty water became clean in the bathroom and kitchen faucet, which was very troublesome. Also, if dirty water is mixed with the water in the hot water storage tank, the hot water storage tank must be washed after all the water in the hot water storage tank is discharged, which is very time consuming.

  Therefore, when water outage is detected, the water supply opening / closing means that opens and closes the water supply path to the hot water storage tank is closed immediately after the water supply work is stopped, and the drainage opening / closing means provided upstream from the water supply opening / closing means is opened. There was one that prevented the dirty water from flowing into the hot water storage tank (Patent Document 1).

Japanese Patent No. 5050000

  However, in the thing like patent document 1, the problem that the rust of the piping immediately after waterworks and the sludge mixed at the time of construction will pollute the pressure-reduction valve provided in the upstream rather than the drain opening-and-closing means in a water supply path. there were.

  Moreover, in the thing like patent document 1, the water supply opening-and-closing means which opens and closes the water supply path | route to a hot water storage tank, and the drainage opening-and-closing means provided upstream from the water supply opening-and-closing means are provided, and several opening-and-closing means are needed. Therefore, there was a problem of cost increase due to the increase in the number of parts.

A hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, and a decompression for adjusting a water supply pressure in the middle of the flow path of the water supply pipe A valve, a drain pipe branched from the water supply pipe upstream of the pressure reducing valve, a flow path of the water supply pipe provided at a branch point of the water supply pipe and the drain pipe, and a flow path of the drain pipe A three-way valve for switching and a control device for performing switching control of the three-way valve were provided.

  A drain switch for instructing switching of the three-way valve is provided on a remote controller that is communicably connected to the control device.

As described above, according to the present invention, the three-way valve that can switch the flow path between the water supply direction and the water discharge direction is provided upstream of the pressure reducing valve in the water supply pipe. Dirty water mixed with sludge, etc., can be prevented from flowing into the hot water storage tank or pressure reducing valve, and can be easily drained to the outside, and the switching operation can be performed only with the three-way valve, so the number of parts is low. It is easy to use and can control drainage.

1 is a schematic configuration diagram of a hot water storage type hot water supply apparatus according to a first embodiment of the present invention. The flowchart figure for demonstrating 1st Embodiment of this invention.

1st Embodiment of the heat pump hot water storage type hot-water supply apparatus of this invention is described based on FIG.
1 is a hot water storage tank for storing hot water, 2 is a water supply pipe connected to the lower part of the hot water storage tank 1, 3 is a hot water supply pipe connected to the upper part of the hot water storage tank 1, and 4 is a heat pump for heating city water in the hot water storage tank 1. The type heating means 5 is a heat pump circulation pipe connecting the hot water storage tank 1 and the heat pump type heating means 4.

  6 is a water supply bypass pipe that branches in the middle of the water supply pipe 2, and 7 is a mixture that mixes hot water flowing through the hot water supply pipe 3 and city water flowing through the water supply bypass pipe 6 at an appropriate ratio to adjust to the hot water supply set temperature or bath set temperature. A valve 8 is a hot water tap for discharging hot water mixed by the mixing valve 7.

9 is a supply port for supplying city water, 10 is a pressure reducing valve having a filter for removing impurities, 11 is a pressure reducing valve for branching upstream of the pressure reducing valve 10, and 12 is a flow of the water supply pipe 2. A three-way valve 13 that can switch between the path and the flow path of the drainage pipe 11 is a drainage hopper that allows the water drained from the drainage pipe 11 to flow into the sewer.

Reference numeral 14 is a control device that performs predetermined calculations based on the output of each sensor composed of a microcomputer or the like to control the operation of the device and also controls switching of the three-way valve 12. Reference numeral 15 can be set by the user to perform various settings. A remote controller having an operation unit and capable of communication-connecting the operated content to the control device 14, 16 switches between the flow path of the water supply pipe 2 and the flow path of the drain pipe 11 connected to the lower part of the hot water storage tank 1 It is a drain switch.

Next, the boiling operation will be described.
When there is a request for boiling, a circulation pump (not shown) in the middle of the heat pump circulation 5 is driven to draw water from the lower part of the hot water storage tank 1 and continue the operation of heating it with the heat pump heating means 4 and returning it to the upper part of the hot water storage tank 1. As a result, the water in the hot water storage tank 1 is gradually heated to hot water.

Next, the hot water supply operation will be described.
When the hot water tap 8 is opened, city water is supplied from the supply port 9, the pressure is adjusted by a pressure reducing valve 10 provided in the middle of the water supply pipe 2, and then flows into the lower part of the hot water storage tank 1. The hot water pushed out from the upper part of the hot water storage tank 1 and the water in the water supply bypass pipe 6 are mixed at a set temperature ratio requested by the user and supplied from the hot water tap 8.

  However, if hot water is supplied immediately after the waterworks, the piping rust and sludge mixed during construction will be mixed with the water in the hot water tank 1 and become dirty water. In order to wash the water, the water can be washed only after all the water in the hot water storage tank 1 is drained.

Here, 1st Embodiment is described based on the flowchart figure about the drainage operation immediately after waterworks.

When it is detected that the user who has confirmed that the waterworks has been completed has turned on the drain switch 16 of the remote controller 15 (S1), the control device 14 drives the three-way valve 12 to discharge the drain pipe 11 from the flow path of the water supply pipe 2. (S2), and starts draining water from the supply port 9 to the drain hopper 13 through the drain pipe 11.

When a certain time (here, 5 minutes) has elapsed since the drainage started (S3), the control device 14 switches the three-way valve 12 from the flow path of the drain pipe 11 to the flow path of the water supply pipe 2 of the hot water storage tank 1 (S4). Stop draining.

In this way, by draining the water in the water supply pipe 2 for a certain period of time after the completion of the waterworks, the drainage hopper 13 does not flow into the hot water storage tank 1 without rusting of the pipes that have come out during the waterworks or sludge mixed during the construction. Therefore, the hot water storage tank 1 can be drained by a simple operation.

Further, by providing a flow path for the drain pipe 11 that branches from the water supply pipe 2 upstream from the pressure reducing valve 10, the pressure reducing valve is attached to the filter of the pressure reducing valve 10 due to rust of the piping or sludge mixed during construction. Prevent clogging.

In addition, this invention is not limited to 1st Embodiment, It does not prevent changing in the range which does not change a summary, For example, although the fixed time of drainage was 5 minutes, it is limited to 5 minutes. Instead of this, a time of 5 minutes or more or a time of 5 minutes or less may be set as the fixed time.

In addition, the three-way valve 12 is provided with detection means for detecting restoration from the waterworks, and when the restoration from the construction is detected, the three-way valve 12 is automatically switched so that the user does not have to press the drain switch 16 in the pipe. The water may be drained, and when the drainage is finished, it may be switched to the flow path of the water supply pipe 2.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 9 Supply port 10 Pressure reducing valve 11 Drain pipe 12 Three-way valve 13 Drain hopper 14 Control device 15 Remote control 16 Drain switch

Claims (2)

  A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, and a pressure reducing valve for adjusting a water supply pressure in the middle of the flow path of the water supply pipe And a drain pipe that branches off from the water supply pipe upstream of the pressure reducing valve, and a flow path of the water supply pipe and a flow path of the drain pipe provided at a branch point between the water supply pipe and the drain pipe. A hot water storage type hot water supply apparatus comprising a three-way valve and a control device that performs switching control of the three-way valve.   The hot water storage type hot water supply apparatus according to claim 1, wherein a drain switch for instructing switching of the three-way valve is provided on a remote controller connected to be able to communicate with the control device.

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