JP5260011B2 - Hot water storage type electric water heater - Google Patents

Description

  The present invention relates to a hot water storage type electric water heater capable of detecting that a hot water supply temperature is abnormal and stopping or starting hot water supply.

  FIG. 3 is a system configuration diagram showing a conventional hot water storage type hot water supply apparatus. In FIG. 3, the water in the hot water storage tank 1 is heated by the heating means 7 at night or the like, and the whole reaches a predetermined boiling temperature. Boiling hot water in the hot water storage tank 1 is discharged from the top by the amount required by the user during the daytime, etc., and mixed with water to supply hot water. Then, an amount of water commensurate with the hot water is supplied into the tank 1 from the bottom, and the water in the tank 1 is additionally heated by the heating means 7 as necessary. The user inputs a desired hot water supply temperature Tu from the human power means 14, the temperature T0 of the water mixed in the hot water is detected by the water temperature sensor 13, and the hot water temperature Ti in the hot water storage tank 1 is in the vertical direction of the tank. It is detected by a plurality of hot water temperature sensors 12a to 12f provided at predetermined intervals. The hot water amount calculation means 11 multiplies the difference (Ti-Tu) between the hot water temperature Ti detected by the hot water temperature sensors 12a to 12 and the hot water supply temperature Tu by the tank volume Vi occupied by the temperature sensor, The accumulated water amount Vx is obtained by dividing the cumulative result by the difference (Tu−T0) between the hot water supply temperature Tu and the water temperature T0, and the total volume V of the hot water storage tank 1 is added to this to calculate the hot water supply amount Vu. The hot water supply amount Vu calculated in this way is displayed by the display means 15 as a numerical value or the like. Thus, the user can know how much remaining hot water in the hot water storage tank 1 is converted into the desired hot water supply temperature Tu just by looking at the displayed numerical values, etc. Anxiety is relieved, and the degree of additional overheating can be adjusted based on the above numerical values, etc., to avoid hot water shortages and excess hot water.

JP-A-5-118572

  However, in the conventional storage hot water supply system, the temperature of the hot water storage tank is detected in detail using many temperature sensors to inform the user of the amount of remaining hot water that can be supplied to the user or by learning, etc. Although we are focusing on preventing hot water shortages and improving operational efficiency by performing simulated hot water storage operations, we are referring to what to do when hot water runs out while using hot water supply functions such as bathing hot water. I can't find anything.

  An object of the present invention is to obtain a safe and easy-to-use storage type electric water heater that can suppress the influence on the user even when the hot water tank runs out.

The present invention relates to a hot water storage type electric water heater provided with a hot water storage tank, a temperature sensor attached to the upper part of the hot water storage tank for detecting the temperature of the hot water stored in the hot water storage tank, and a lower part of the hot water storage tank A water supply pipe for supplying water to the water supply, a temperature sensor attached to the water supply pipe for detecting the temperature of the water supply, and a hot water supply pipe for guiding the hot water pushed out from the upper part of the hot water storage tank by the water supply pressure supplied through the water supply pipe A bypass pipe that bypasses the hot water storage tank, a mixing valve that mixes the hot water led from the hot water pipe and the water led by the bypass pipe to produce mixed hot water at a desired temperature, and a single pipe that extends from the mixing valve The temperature of the hot water supplied from the hot water supply pipe is determined based on the temperature of the hot water storage tank detected by the temperature sensor at the top of the hot water storage tank. And a control device that controls the motor-operated valve, a heat pump that uses carbon dioxide as a refrigerant as a heat source for producing hot water to be stored in the hot water storage tank, and the control device is the temperature sensor at the top of the hot water storage tank. The motor-operated valve is controlled to close or open according to the detected temperature, and when it is detected that the hot water storage tank has run out or the amount of remaining hot water has decreased while supplying a predetermined amount of hot water, The valve is closed to temporarily stop hot water supply, and after detecting that a certain amount or more of hot water has been stored in the hot water storage tank by operating the heat pump cycle , control is performed to resume the hot water supply that has been temporarily stopped. When restarting the hot water supply, the opening degree of the motor-operated valve is gradually increased .

  In addition, it is preferable that the said motor operated valve can make the total flow rate of mixed hot water zero.

  According to the present invention, since it is detected that the hot water supply temperature is abnormal and the hot water supply is stopped or started, a hot water storage type electric water heater that is safe and easy to use can be obtained.

  Embodiments of the electric water heater according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a view showing an embodiment of a hot water storage type electric water heater according to the present invention.

This hot water supply system includes a hot water storage tank 1, a temperature sensor 5 attached to the upper part of the hot water storage tank 1 for detecting the temperature of the hot water stored in the hot water storage tank 1, a water supply pipe 6 for supplying water to the lower part of the hot water storage tank, The temperature sensor 10 attached to the water supply pipe 6 for detecting the temperature of the water supply, the hot water supply pipe 7 for guiding the hot water pushed out from the upper part of the hot water storage tank 1 by the water supply pressure supplied through the water supply pipe 6, and the hot water storage tank 1 are bypassed A bypass valve 8, a mixing valve 2 that mixes hot water led from the hot water supply pipe 7 and water led by the bypass pipe 8 to produce mixed hot water at a desired temperature, and a flow rate sensor 3 that detects the flow rate of the mixed hot water. The hot water supply cycle system that controls the hot water supply operation including the motor-operated valve 4 that can reduce the total flow rate of the mixed hot water, the compressor 13, the water refrigerant heat exchanger 16, the decompression device 14, and the air heat exchanger 15 Communicate to form a closed circuit Absorbing heat in the air heat exchanger takes in outside air by the fan 17, the hot water storage tank 1 creates a hot water giving the heat with water-refrigerant heat exchanger 16 to the cold water guided by the circulation pump 18 from the lower portion of the hot water storage tank 1 It is composed of a heat pump cycle system that is a heat source that stores hot water by returning it to the top.

In the hot water supply system of the present embodiment, while the temperature sensor 5 detects the presence of high temperature hot water in the hot water storage tank 1, the mixing valve 2 creates and supplies hot water at an appropriate temperature according to the temperature requested from the control device 21. However, when the temperature sensor 5 detects that the hot water in the hot water storage tank 1 has run out or the amount of remaining hot water has decreased, the motor-operated valve 4 can be closed to make the total flow rate zero. This is a useful function for hot water supply to a bathtub. For example, when the hot water in the hot water storage tank 1 runs out during the 200L hot water filling to the bathtub (for example, 150L), the hot water supply cannot be stopped because the motor-operated valve 4 is not provided in the prior art, and the low temperature water cannot be stopped. However, since the electric water heater of the present invention is equipped with the motorized valve 4, the hot water in the hot water storage tank 1 or the amount of remaining hot water is reduced. It is possible to detect that the temperature has decreased, automatically stop hot water supply, and keep the temperature of the hot water in the bathtub at an appropriate temperature.

  Thereafter, it is also possible to operate the heat pump cycle while temporarily stopping hot water supply and perform hot water storage operation to the hot water storage tank 1. After the temperature sensor 5 detects that a certain amount of hot water is stored in the hot water storage tank by the operation of the heat pump cycle, the hot water filling operation to the bathtub that has been temporarily stopped is resumed, and the hot water filling to the bathtub is resumed. It can also be completed.

  At this time, as a temperature sensor for detecting the amount of hot water stored in the hot water storage tank 1, the temperature sensor 11 disposed on the lower side of the hot water storage tank 1 than the temperature sensor 5 may be used.

  Further, the hot water supply temperature may be monitored by the temperature sensor 9. By monitoring the hot water supply temperature with the temperature sensor 9, when the hot water supply temperature deviates from the control range of the control device 21, that is, when the temperature becomes high (eg, 60 ° C. or higher) or low (eg, water temperature) By closing the valve 4, it is possible to prevent a user from being burned or a shock due to sudden water splash.

  When the hot water supply is temporarily stopped due to an abnormality as described above, it is preferable that the user opens the motor-operated valve 4 by manually operating the control device 21. At this time, the control device 21 may continue to notify the abnormality. If this motor-operated valve 4 is driven by a stepping motor and can be stopped at an arbitrary position between fully open and fully closed, the opening degree is increased stepwise to determine whether the hot water supply temperature is no longer abnormal. It can be confirmed and safety can be improved.

In this way, it is possible to detect that the hot water supply temperature is abnormal, stop hot water supply, and start hot water supply when it is no longer abnormal.

  FIG. 2 is a view showing another embodiment of the hot water storage type electric water heater of the present invention.

  In the first embodiment, a heat pump cycle is assumed as a heat source for storing hot water, but an electric heater may be provided inside the hot water storage tank 1. In this case, a two-heater type structure in which an upper electric heater 19 and a lower electric heater 20 are installed at two locations, an upper portion and a lower portion, of the hot water storage tank 1 is adopted. Other configurations in the hot water supply cycle are the same as those in the first embodiment.

  When boiling the entire amount of the hot water storage tank 1, the lower electric heater 20 is used to detect that the hot water has run out or the amount of remaining hot water has been reduced while the bath is being filled with water. If the upper electric heater 19 is used, the boiling efficiency is good and the usability is also good.

1 is a system diagram showing an embodiment of a hot water storage type electric water heater of the present invention. The systematic diagram which shows the other Example of this invention. The system diagram which shows the conventional hot water storage-type electric water heater.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Mixing valve 3 Flow rate sensor 4 Electric valve 5 Temperature sensor (hot water tank upper part)
6 Water supply pipe 7 Hot water supply pipe 8 Bypass pipe 9 Temperature sensor (mixed hot water temperature)
10 Temperature sensor (water supply temperature)
11 Temperature sensor (lower part of hot water storage tank)
12 Temperature sensor (hot water supply piping)
13 Compressor 14 Pressure reducing device 15 Air heat exchanger 16 Water refrigerant heat exchanger 17 Fan 18 Circulation pump 19 Upper electric heater 20 Lower electric heater

Claims (3)

In a hot water storage type electric water heater equipped with a hot water storage tank,
A temperature sensor attached to the upper part of the hot water storage tank for detecting the temperature of the hot water stored in the hot water storage tank, a water supply pipe for supplying water to the lower part of the hot water storage tank, and attached to the water supply pipe A temperature sensor that detects the temperature of the feed water, a hot water pipe that guides the hot water pushed out from the upper part of the hot water storage tank by the feed water pressure supplied through the water supply pipe, a bypass pipe that bypasses the hot water storage tank, and a hot water pipe that leads A mixing valve that mixes the hot water and the water guided by the bypass pipe to produce mixed hot water at a desired temperature, and an electric motor that is arranged on a single path extending from the mixing valve and can stop the total flow rate of the mixed hot water A control device for controlling the motor-operated valve by determining a temperature of hot water supplied from a hot water supply pipe based on a temperature of the hot water storage tank detected by a temperature sensor at the top of the hot water storage tank;
Adopting a heat pump that uses carbon dioxide as a refrigerant as a heat source to create hot water to be stored in the hot water storage tank,
The control device controls the motor-operated valve to close or open depending on the temperature detected by the temperature sensor at the upper part of the hot water storage tank, and the hot water tank has run out or the remaining hot water amount while supplying a predetermined amount of hot water. When it is detected that the amount of water has decreased, the motor-operated valve is closed to temporarily stop hot water supply, and after detecting that a certain amount or more of hot water has been stored in the hot water storage tank by operating the heat pump cycle, The hot water storage type electric water heater is characterized in that when the hot water supply is controlled to be resumed and the hot water supply that has been temporarily stopped is resumed, the opening degree of the motor-operated valve is gradually increased .   2. The hot water storage type hot water supply apparatus according to claim 1, wherein the control device detects that a certain amount or more of high temperature hot water is stored in the hot water storage tank by a temperature sensor at an upper part of the hot water storage tank.   In Claim 1, provided with a temperature sensor on the lower side attached to the lower side than the temperature sensor on the upper part of the hot water storage tank,
  The hot water storage hot water heater is characterized in that the control device detects that a predetermined amount or more of hot water is stored in a hot water storage tank by the temperature sensor on the lower side.

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