Hot water storage type water heater

Abstract

To provide a hot water storage type water heater which can combine a supply / delivery pump and a circulation pump as one pump.SOLUTION: A hot water storage type water heater includes: a can body 1a for storing hot water; a heat source (3) for on / off-heating the can body 1a; can body temperature detection means 13; a can body water supply port 9 provided at a lower part of the can body 1a; a water supply pipe 9a communicated with a water storage tank 45, and connected to the can body water supply port 9; a can body hot water tapping port 11 provided at an upper part of the can body 1a; a hot water supply pipe 11a connected to the can body hot water tapping port 11; a pump 10 provided at the water supply pipe 9a, and for delivering water to the can body 1a side; a branch passage 40 for branching the hot water supply pipe 11a into two ways; a hot water tapping passage 11b connected to one on the downstream side of the branch passage 40, and including a hot water supply port 11c at a terminal; a circulation passage 12 connected to the other on the downstream side of the branch passage 40 and the water supply pipe 9a; and a control part 20 for turning on / off the heat source based on the temperature detected by the can body temperature detection means 13. It also has switching means for allowing one of the hot water tapping passage 11b and the circulation passage 12 to flow more than the other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a storage-type hot water heater that constantly stores a predetermined amount of hot water in a tank body and supplies hot water at a set temperature to a hot water supply point. More specifically, the present invention relates to a small-sized storage-type hot water heater with a small tank body volume that can be carried outdoors for outdoor use. [Background technology]

[0002] Conventionally, water heaters of this type have been proposed for outdoor use, as portable water heaters for use in emergencies, or as bathtub systems installed in vehicles for providing on-site bathing services. These water heaters have a hot water storage tank and pump inside the device, and are equipped with a supply means for taking the hot water stored in the hot water storage tank to the outside (for example, Patent Document 1).

[0003] The device in Patent Document 1 is a water heater that has a built-in hot water storage tank and pump, a heat exchanger that can heat water using an external heat source, and a supply means that extracts hot water from the hot water storage tank to the outside, circulating hot water between the hot water storage tank and the heat exchanger and capable of extracting hot water from the supply means to the outside. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-044760 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the water heater in Patent Document 1, the hot water cannot be used once the hot water in the tank runs out, and if an attempt is made to increase the amount of hot water stored in the tank, the tank's volume increases, which results in the product becoming larger, negating the advantages of being compact and easy to carry. One idea that could be considered was to use a new water supply pump to supply water to the tank from a separate water storage tank, but this would require two pumps: a water supply pump and the conventional delivery pump, which would increase the cost of the product and leave room for improvement.

[0006] Furthermore, in the water heater of Patent Document 1, when using the shower, hot water is supplied to the shower head from a pipe pulled out from the bottom of the tank, so there was a problem that the water could not be used until the hot water in the tank had heated up to the target temperature evenly all the way to the bottom of the tank. Therefore, one idea is to supply water from the water tank to the bottom of the tank, place the pipes and thermometer that draw water from the tank to dispense the hot water at the top of the tank, and draw hot water from the top of the tank, which warms up immediately after heating starts, and send it to the shower head.However, if water is supplied from the water tank to the bottom of the tank every time the hot water in the tank is used, warm water will only accumulate at the top of the tank, and the amount of hot water that can be used at one time will be limited to the hot water at the top of the tank.Therefore, one idea is to circulate the hot water in the tank so that the entire tank is heated to the target temperature, but this requires a new circulation pump, so there is room for improvement.

[0007] The present invention has been made in consideration of this background, and aims to provide a storage-type water heater that can combine the water supply / delivery pump and the circulation pump into one, even if it is a storage-type water heater that supplies water from a separately prepared water tank to the tank and circulates the hot water in the tank so that the entire tank is heated to a target temperature. [Means for solving the problem]

[0008] The present invention has been made to achieve the above object, and claim 1 provides a water heater comprising a water heater body for storing hot water, a heat source for turning on and off the heat source body, a water heater body temperature detection means for detecting the temperature of the water heater body, a water heater body water inlet provided at the bottom of the water heater body, a water supply pipe communicating with a water tank and connected to the water heater body water inlet, a water heater body hot water outlet provided at the top of the water heater body, a hot water supply pipe connected to the water heater body hot water outlet, a pump provided at the water supply pipe for delivering water to the water heater body side, a branch path for branching the hot water supply pipe into two directions, and The device is characterized by comprising a hot water outlet path connected to one downstream side of a branch path and having a hot water supply outlet at its end, a circulation path connected to the other downstream side of the branch path and the water supply pipe upstream of the pump in the water flow direction of the water supply pipe, and a control unit that turns on the heat source when the boiler body temperature detection means falls below a first temperature and turns off the heat source when it exceeds a second temperature higher than the first temperature, and has a switching means that allows more hot water flowing through the hot water supply pipe in either the hot water outlet path or the circulation path than the other.

[0009] In claim 2, the switching means is an electrically operated three-way valve, and is equipped with a hot water outlet mode in which the circulation path side of the three-way valve is closed and hot water is dispensed from the hot water outlet, a circulation mode in which the hot water outlet path side of the three-way valve is closed and hot water flows from the hot water supply pipe to the tank body via the circulation path and the pump, and a hot water outlet instruction means connected to the control unit and accepting instructions from the user to start and stop hot water dispense, wherein the control unit drives the pump, and when the hot water dispense instruction means accepts an instruction to start hot water dispense, it closes the circulation path side of the three-way valve to switch to the hot water dispense mode, and when the hot water dispense instruction means accepts an instruction to stop hot water dispense, it closes the hot water outlet path side of the three-way valve to switch to the circulation mode.

[0010] In a third aspect of the present invention, a part of the circulation path is provided with a narrow diameter portion having a diameter smaller than that of the hot water outlet path, and the switching means is a hot water tap provided at the hot water outlet. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a storage type hot water heater that can combine the water supply / delivery pump and the circulation pump into one. [Brief explanation of the drawings]

[0012] [Figure 1] Schematic configuration diagram of a first embodiment of the present invention [Figure 2] Block diagram of a first embodiment of the present invention [Figure 3] 1 is a flowchart illustrating a standby state according to a first embodiment of the present invention; [Figure 4] A flowchart explaining the start and stop of pouring water in the first embodiment of the present invention. [Figure 5] Schematic configuration diagram of a second embodiment of the present invention [Figure 6] Block diagram of a second embodiment of the present invention [Figure 7] Flowchart of the second embodiment of the present invention DETAILED DESCRIPTION OF THE INVENTION

[0013] A first embodiment of the present invention will be described with reference to FIGS.

[0014] Reference numeral 1 denotes a small storage-type water heater, 1a denotes a cylindrical can body that stores a fixed amount of hot water inside, 2 denotes a combustion chamber formed inside the lower part of the can body 1a, and 3 denotes a burner that acts as a heat source to heat the can body 1a on and off, and is a gun-type burner that faces the inside of the combustion chamber 2 and acts as a heat source integrated with an ignition electrode 4 and a nozzle 5. The hot water in the boiler body 1a is heated by combustion of the burner 3.

[0015] Reference numeral 6 denotes an exhaust chamber adjacent to the top of the can body 1a, 7 denotes a number of smoke pipes connecting the combustion chamber 2 and the exhaust chamber 6, and 8 denotes an exhaust stack connected to the exhaust chamber 6. Combustion gas generated in the combustion chamber 2 by combustion of the burner 3 is sent from the combustion chamber 2 through the smoke pipe 7 to the exhaust chamber 6 and is exhausted from the exhaust stack 8.

[0016] Reference numeral 9 denotes a water supply port provided on the can body 1a, and 9a denotes a water supply pipe connected to the can body water supply port 9 on one side and to the water tank 45 on the other side, which supplies water from the water tank 45 to the can body 1a. Reference numeral 10 denotes a pump provided in the water supply pipe 9a for delivering water to the boiler body 1a side.

[0017] Reference numeral 11 denotes a boiler body outlet connected to the top of the boiler body 1a, 11a denotes a hot water supply pipe connected to the boiler body outlet 11 on one side and to a branch passage 40 described later on the other side, 11b denotes a hot water outlet passage connected to one downstream side of the branch passage 40 and having a hot water supply port 11c at its end, and 12 denotes a circulation passage connected to the other downstream side of the branch passage 40 and connected to the water supply pipe 9a upstream in the water flow direction from the pump 10.

[0018] Specifically, the branch passage 40 is an electrically operated three-way valve that serves as a switching means for allowing more hot water flowing from the hot water supply pipe 11a to flow through either the hot water outlet passage 11b or the circulation passage 12 than through the other.

[0019] Reference numeral 13 denotes a hot water temperature sensor serving as a tank body temperature detection means for detecting the temperature of the hot water in the tank body 1a.

[0020] Reference numeral 14 denotes a remote control that gives operating instructions to the hot water storage type water heater 1, and this remote control 14 is equipped with an operation switch 15, a hot water temperature setting switch 16, a hot water dispensing instruction means 17 such as a switch that receives instructions from the user to start and stop hot water dispensing, and a display unit 18.

[0021] Reference numeral 20 denotes a control unit having a microcomputer that is communicatively connected to the remote control 14 and receives the temperature detected by the boiler body temperature detection means 13 and signals from the remote control 14 to control the operation of the burner 3, pump 10, and each actuator.

[0022] Reference numeral 50 denotes a housing of the storage type hot water heater 1 that houses the can body 1a and the circulation path 12 inside.

[0023] The control unit 20 controls the combustion on and off so as to maintain the temperature of the hot water in the can body 1a at a predetermined temperature set by the user.More specifically, when the temperature detected by the can body temperature detection means 13 falls below a first temperature T1 (combustion on temperature) (e.g., 38°C) which is lower than the set temperature (e.g., 42°C), it turns on the combustion of the burner 3 which has a fixed combustion capacity, and when the temperature detected by the can body temperature detection means 13 exceeds a second temperature T2 (combustion off temperature) which is the same temperature as the set temperature, it controls the combustion of the burner 3 to be turned off, thereby providing a heating control means for maintaining the temperature of the hot water in the can body 1a at the set temperature, and the hot water maintained at the set temperature is used for hot water supply.

[0024] In the present invention, the switching means includes a hot water discharge mode in which the circulation path 12 side of the three-way valve (40) is closed and hot water is discharged from the hot water supply port 11c, and a circulation mode in which the hot water discharge path 11b side of the three-way valve (40) is closed and hot water flows from the hot water supply pipe 11a to the boiler body 1a via the circulation path 12 and the pump 10. The control unit 20 drives the pump 10, and when the hot water discharge instruction means 17 receives a command to start discharging hot water, it closes the circulation path 12 side of the three-way valve (40) to switch to the hot water discharge mode, and when the hot water discharge instruction means 17 receives a command to stop discharging hot water, it closes the hot water discharge path 11b side of the three-way valve (40) to switch to the circulation mode.

[0025] Next, the operation will be described with reference to FIGS.

[0026] First, in step S1, the user turns on the operation switch 15 of the remote control 14. In step S2, the three-way valve (40) is set to a circulation mode (dashed arrow in Figure 1) in which the water flows from the hot water supply pipe 11a to the circulation path 12 side. In step S3, the pump 10 is driven. In step S4, the on / off combustion of the burner 3 is started, the temperature of the hot water in the boiler body 1a is heated to the target set temperature, and the system enters a standby state in preparation for a command from the user to start dispensing hot water. If the operation switch 15 of the remote control 14 is turned off in step S1, the control unit 20 stops the pump 10 and the burner 3 (steps S5 and S6).

[0027] Next, in step S7, when the hot water dispensing instruction means 17 of the control unit 20 receives a command to start dispensing hot water, the control unit 20 switches the three-way valve (40) to the hot water dispensing mode in step S8. Then, the flow in the circulation path 12 stops, the pump 10 starts pumping water from the water tank, the water pumped by the pump 10 enters the boiler body 1a, and the heated hot water in the upper part of the boiler body 1a passes through the hot water supply pipe 11a, the three-way valve (40), and the hot water outlet path 11b and is dispensed from the hot water supply port 11c (solid arrow in Figure 1).

[0028] When the hot water discharge instruction means 17 receives a command to stop the hot water discharge in step S7, the three-way valve (40) is switched to the circulation mode in step S9. This stops the flow in the hot water discharge path 11b and causes the flow to take place through the circulation path 12, stopping the hot water discharge from the hot water supply port 11c and the pumping of water from the water storage tank 45. The hot water in the boiler body 1a passes through the hot water supply pipe 11a, the circulation path 12, and the water supply pipe 9a, and is circulated back to the boiler body 1a by the pump 10 (the dashed arrow in FIG. 1). This causes the entire inside of the boiler body 1a to be heated to the target temperature.

[0029] This makes it possible to provide a storage-type hot water heater that can combine the water supply / discharge pump and the circulation pump into one.

[0030] Next, a second embodiment will be described with reference to FIGS.

[0031] The second embodiment differs from the first embodiment in that a portion of the circulation path 12 is provided with a narrow diameter portion 12a having an inner diameter smaller than the inner diameter of the hot water outlet path 11b, the branch path 40 into which water flows from the hot water supply pipe 11a and flows out to the hot water outlet path 11b and the circulation path 12 is a cheese pipe (40), and a manually opened and closed hot water tap 11d is provided at the hot water supply outlet 11c as a switching means for allowing more hot water flowing from the hot water supply pipe 11a to flow into either the hot water outlet path 11b or the circulation path 12 than the other.

[0032] Next, the operation will be described with reference to FIG.

[0033] First, when the user turns on the operation switch 15 of the remote control 14 in step S10, the pump 10 is driven in step S11, and the burner 3 starts to burn on and off in step S12, heating the temperature of the hot water in the boiler body 1a to the target set temperature, and the system enters a standby state in preparation for a hot water dispense command from the user. If the operation switch 15 of the remote control 14 is turned off in step S13, the control unit 20 stops the pump 10 and the burner 3 (steps S13 and S14).

[0034] While the user closes the hot water tap 11d, the pump 10 drives the hot water in the can body 1a to flow through the hot water supply pipe 11a, the cheese pipe (40), the circulation path 12, the water supply pipe 9a, and then to the can body 1a, and this circulation maintains the entire inside of the can body 1a at the target temperature (dashed arrow in Figure 5).

[0035] When the user opens the hot water tap 11d, the diameter (inner diameter) of the narrow diameter portion 12a provided in the circulation path 12 is smaller than the diameter (inner diameter) of the hot water outlet path 11b, so that water does not flow easily through the circulation path 12 side but flows through the hot water outlet path 11b side. As a result, the pump 10 begins to pump water from the water tank 45, the water sent out by the pump 10 enters the boiler body 1a, and the heated hot water at the top of the boiler body 1a passes through the hot water supply pipe 11a, the tee pipe (40), and the hot water outlet path 11b and comes out of the hot water tap 11d (solid arrow in Figure 5).

[0036] When the user closes the hot water tap 11d, the flow in the hot water outlet passage 11b stops, and the pump 10 is driven, causing the hot water in the can body 1a to flow again through the hot water supply pipe 11a, the cheese pipe (40), the circulation passage 12, the water supply pipe 9a, and then back to the can body 1a, restarting the circulation (dashed arrows in Figure 5).

[0037] This makes it possible to provide a storage-type hot water heater that can combine the supply / discharge pump and the circulation pump into one.

[0038] Although the heat source is explained as a pressure spray gun burner, other heat sources may also be used.

[0039] It should be noted that the other configurations used in this embodiment are presented as examples and are not intended to limit the scope of the invention, and the invention can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are also included in the inventions described in the claims and their equivalents. [Explanation of symbols]

[0040] 1: Storage water heater 1a:Can body 3: Burner (heat source) 9: Boiler body water inlet 9a: Water supply pipe 10: Pump 11: Boiler body tapping port 11a: Hot water pipe 11b: Hot water outlet 11c: Hot water outlet 11d: Hot water tap (switching means) 12: Circulation route 12a: Narrow diameter part 13: Can body temperature detection means 17: Hot water supply instruction means 20: Control section 40: Branch (three-way valve, tee pipe) 45: Water tank T1: 1st temperature T2: 2nd temperature

Claims

1. A tank body for storing hot water; a heat source for heating the can body on and off; a can body temperature detection means for detecting the temperature of the can body; a water supply port provided at the bottom of the can body; a water supply pipe communicating with the water tank and connected to the water supply port of the boiler body; a can body tapping port provided on an upper portion of the can body; A hot water supply pipe connected to the boiler body hot water outlet; a pump provided in the water supply pipe for delivering water to the tank body; A branch path that branches the hot water supply pipe into two directions; a melt outlet path connected to one downstream side of the branch path and having a melt supply port at its end; a circulation path connecting the other downstream side of the branch path to the water supply pipe upstream of the pump in the water flow direction of the water supply pipe; a control unit that turns on the heat source when the temperature detection means detects a temperature below a first temperature and turns off the heat source when the temperature detection means detects a temperature above a second temperature that is higher than the first temperature; Equipped with A switching means is provided for causing the hot water flowing through the hot water supply pipe to flow more through either the hot water outlet path or the circulation path than through the other. A storage type water heater characterized by the above.

2. the switching means is an electrically operated three-way valve, a hot water dispensing mode in which the circulation path side of the three-way valve is closed and hot water is dispensed from the hot water supply port; a circulation mode in which the hot water outlet side of the three-way valve is closed and hot water flows from the hot water supply pipe to the tank body via the circulation path and the pump; A hot water dispensing instruction means connected to the control unit and configured to receive instructions from a user to start or stop dispensing hot water; Equipped with The control unit Driving the pump; When the hot water dispensing instruction means receives a signal indicating that the hot water should be dispensed, the three-way valve is closed on the circulation path side to enter the hot water dispensing mode. When the water discharge instruction means receives a water discharge stop signal, the water discharge passage side of the three-way valve is closed to switch to the circulation mode.

2. The hot water storage type water heater according to claim 1.

3. a narrow diameter portion that is smaller in diameter than the outlet passage is provided in a part of the circulation passage, The switching means is a hot water tap provided at the hot water outlet.

2. The hot water storage type water heater according to claim 1.

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