WO2018166147A1

WO2018166147A1 - Low power instant electric water heater with small volume water tank

Info

Publication number: WO2018166147A1
Application number: PCT/CN2017/100294
Authority: WO
Inventors: 卢德纯
Original assignee: 广东吉宝电器科技有限公司
Priority date: 2017-03-13
Filing date: 2017-09-02
Publication date: 2018-09-20
Also published as: CN207196909U; CN106766108A; CN107741089A

Abstract

A low power instant electric water heater with a small volume water tank, comprising a water tank (1), an outer circulation heating assembly, and a one-way valve (5), a cold water inlet end, a hot water outlet end (12), and a water circulation inlet end (13) being arranged on the water tank (1). The hot water outlet end (12), the outer circulation heating assembly, the one-way valve (5), and the water circulation inlet end (13) are connected in turn by means of a pipeline to form an outer circulation heating loop; and the hot water outlet end (12) and the outer circulation heating assembly are connected in turn by means of a pipeline to form a water supply path. A temperature sensor apparatus (21) used for sensing the water temperature is arranged on the outer circulation heating assembly and/or inside the water tank (1).

Description

Low-power instant electric water heater with small volume water tank

Technical field

The invention relates to an electric water heater, in particular to a low-power instant electric water heater with a small volume water tank.

Background technique

At present, the existing electric water heaters mainly include water storage type electric water heaters and instant electric water heaters.

The storage type electric water heater needs to be equipped with a large-capacity water tank. The disadvantage is that it requires a very large space to install. The installation and maintenance are very inconvenient. When the hot water is supplied, the water tank will be replenished with cold water synchronously, which will cause the water to cool rapidly in the later stage of hot water supply. Moreover, the heating element is in direct contact with water, has a very high risk of leakage, has extremely serious safety hazards, cannot prevent leakage problems, has an electric leakage accident every year, and the surface of the electric heating tube is caused by the internal high temperature when the electric heating tube works. A large amount of scale is generated, which can accelerate the aging and decay of the electric heating tube, affect the life of the electric heating tube, and is not convenient for maintenance or maintenance. At the same time, the electric corrosion generated between the electric heating pipe and the water tank is also likely to cause water leakage of the water tank, and the water tank needs to be treated by enamel.

Chinese Patent Document No. CN106766124A discloses a split type external circulation heating electric water heater, which comprises a water tank, a heater and a circulation pump, and the heater and the circulation pump are externally placed in a water tank, a water tank, a heater and a circulation pump. The waterway connection constitutes a circulating heating circuit, and the circulation pump draws out the water in the water tank and delivers it to the heater, and the water heated by the heater is returned to the water tank. It adopts the external circulation heating mode, which can realize hydroelectric separation heating and reduce the risk of leakage.

The instant electric water heater needs to be able to supply power with a line carrying a large current. The disadvantage is that the power is too large, and the power supply to the line is high. Generally, the household needs special wiring, and the long-term use of the line is easy to aging, and the risk of fire is high.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art described above, and to provide a low-power instant electric water heater with a small-capacity water tank, which can realize long-time water supply only by providing a small-capacity water tank, thereby saving installation space, and The whole machine has low power, saves electricity, has small requirements on line load, and has wide application range.

The object of the invention is achieved in this way:

Low-power instant electric water heater with small volume water tank, including water tank and external circulation plus a heat assembly and a check valve, wherein the water tank is provided with a hot water outlet end and a circulating water inlet end, and the hot water outlet end, the outer circulation heating assembly, the check valve and the circulating water inlet end are sequentially connected through the pipeline. The circulation heating circuit, the hot water outlet end and the outer circulation heating assembly are sequentially connected through the pipeline to form a water supply passage.

A temperature detecting device for sensing the water temperature is provided on the water inlet end and/or the water outlet end on the outer circulation heating assembly.

A temperature detecting device for sensing the temperature of the water is provided inside the water tank.

The one-way valve has a venting passage opposite to the flow direction of the one-way valve; the one-way valve is a pressure type mechanical one-way valve; or the one-way valve is an electronically controlled electromagnetic valve, and the water supply passage is provided with A flow rate detecting device that detects a water flow rate thereof, and the flow rate detecting device is electrically connected to the electronically controlled electromagnetic valve.

The instant electric water heater further comprises a three-way, a circulating water inlet end, a water inlet end of the three-way and a first water outlet end, a one-way valve is sequentially connected through the pipeline, and a water inlet end of the circulating water inlet end tee And the second water outlet end is connected in sequence through the pipeline.

The circulating water inlet end and the hot water outlet end are respectively located at the top and the bottom of the water tank; the cold water inlet end is disposed at an upper portion of the water tank and away from the hot water outlet end.

The outer circulation heating assembly includes a heater and a circulation pump.

The heater comprises a circular tubular thick film heating element, a heating water channel located inside or outside the thick film heating element, a water inlet channel and a drainage channel extending inside or outside the thick film heating element and the heating water channel as an anti-electric wall. The two ends of the heating water channel are respectively connected with the water inlet channel and the drainage channel; the thick film heating body comprises a circular tube base body, an insulating layer covering the circular tube base body, and a thick film heat-spraying layer disposed on the winding direction of the insulating layer.

The inner cavity of the thick film heating element is provided with an inlet water guiding fluid which is provided with a reciprocating extending water inlet passage, a drainage guiding fluid which is arranged to reciprocally extend the drainage channel, and a drainage guide body and a drainage guide. a flow guiding spacer between the fluids, the two ends of the thick film heating body are respectively provided with a water inlet end covering the inlet water guiding body and a water inlet joint cover for the water inlet opening the water inlet passage, covering the drainage guide The water outlet end of the fluid is provided with a water outlet joint cover for the water outlet to open the drainage channel; the heating water channel is formed between the thick film heating body and the inlet water guiding fluid and the drainage guiding fluid.

The electric water heater comprises a built-in or external electric power control device, and the water supply passage is connected with a mixing valve through a pipeline, and the mixing valve is a manual adjusting mixing valve or an electric adjusting mixing valve.

The electric water heater further includes a remote controller connected to the electric power control device via the wireless module.

By connecting more electric power control devices on the outer circulation heating circuit and water supply path The temperature detecting device can effectively improve the temperature measurement accuracy.

The beneficial effects of the invention are:

Since the external circulation heating assembly is arranged outside the water tank and adopts the form of external circulation heating, the water tank and the external circulation heating assembly adopt a split structure to realize true hydroelectric separation, which is not only more safe and reliable, but also facilitates the external circulation heating assembly. Maintenance or repair, this form of construction also helps to reduce the formation of scale in the tank.

In the non-water supply state (including conventional heating and idle heating), the external circulation heating circuit can continue to work, and the external circulation heating assembly heats the water in the water tank (generally heated to 50-70 degrees); in the water supply state, external circulation heating The circuit stops working, the water supply passage continues to work out hot water, and the external circulation heating assembly can continue to heat up the supplied hot water (generally heated to 60-75 degrees) to achieve thermal compensation, so that the outlet water temperature is high. Effectively slow down the process of hot water cooling, greatly extend the continuous use of hot water, greatly reduce the volume of the water tank, and save installation space.

Because it can realize two-stage heating, the volume of the water tank can be effectively reduced, the volume of the whole machine is smaller, and the installation space is saved, and the hot water in the water tank and the water outlet of the water supply passage can maintain a high temperature, so that the water supply time is long, and the whole water supply time is long. Low power, power saving, low line load requirements, wide application range

The invention only needs to set a small volume water tank to realize long-time water supply, save installation space, and has wider application range, saves installation space, more flexible installation position, less requirement on line load, and no need to re-use special wiring, reduce Installation costs significantly reduce the risk.

The external circulation heating module can realize hydroelectric separation heating, which basically eliminates leakage and is safer to use.

DRAWINGS

Fig. 1 is a schematic structural view of a first embodiment of the present invention.

2 is a schematic structural view of a second embodiment of the present invention.

detailed description

The invention is further described below in conjunction with the drawings and embodiments.

First embodiment

Referring to FIG. 1, the low-power instant electric water heater with a small-capacity water tank includes a water tank 1, an outer circulation heating assembly and a one-way valve 5, and the water tank 1 is provided with a hot water outlet end 12 and a circulating water inlet end. 13, the circulating water inlet end 13 constitutes the circulating water inlet of the hot water and the hydration water inlet of the water tank 1, the hot water outlet end 12, the external circulation heating assembly, the check valve 5 and the circulating water inlet end 13 are sequentially connected through the pipeline The outer circulation heating circuit is formed, and the hot water outlet end 12 and the outer circulation heating assembly are sequentially connected through the pipeline to form a water supply passage.

The temperature detecting device 21 can be disposed on the outer circulation heating circuit and the water supply path, which can effectively improve the temperature measurement accuracy. In this embodiment, the inside of the water tank 1 is provided with a temperature detecting device 21 for sensing the water temperature, and the water detecting device 21 is also provided on the water inlet end and the water outlet end of the outer circulation heating assembly, and the electric water heater includes a built-in or external electric power control device. 7, built-in or external structure of the customer and the actual design can be selected, the electric power control device 7 and electrical components of the electric water heater, including the external circulation heating assembly, temperature detection device 21, the electric power control device 7 using thyristor The control mode can adjust the working power of the external circulation heating assembly according to the temperature in the water tank 1 and the outlet water temperature of the external circulation heating assembly, and particularly adjust the working power of the heater 2 of the circulating heating assembly, and change the working power to make the water The outlet water temperature of the terminal is kept constant for a long time (that is, when the outlet water temperature is high, the heater 2 is not working or the low-power state is working, and when the outlet water temperature is low, the heater 2 is operated at a high power state), so that the water heater has a water outlet temperature that is cold and hot, and rapidly cools. The phenomenon of improving the comfort of the user when taking a bath with hot water.

In the first section of heating, in the non-water supply state (including both normal heating and idle heating), the external circulation heating circuit can continue to work until the temperature detecting device 21 in the water tank 1 detects that the outlet water temperature reaches a set value (eg, 50). At -70 degrees), the external circulation heating circuit stops working, and the preheating operation of the water tank 1 is completed.

In the second stage of heating, in the water supply state, the external circulation heating circuit stops working, the water supply passage continues to work for hot water, and the electric power control device 7 controls the operation of the external circulation heating assembly, so that the outlet water temperature at the outlet end is kept constant for a long time, and the water heater is prevented from appearing out of water. The phenomenon of rapid cooling and rapid cooling, improving the comfort of the user when using hot water bathing, and avoiding the high temperature of the outlet water, the external circulation heating component still works at full power, and the excessively high water temperature is generated. High and burns the human body.

Because it can realize two-stage heating, the water in the water tank and the water in the water supply passage can maintain a higher temperature, effectively lowering the power of the whole machine, and requiring less load on the line, and can greatly prolong the continuous use time of the hot water supply, and greatly reduce the time. The volume of the water tank saves the installation space, and the external circulation heating component can be operated under full power state under the water supply state, and the heating power of the external circulation heating component can be adjusted to be more energy-saving.

The utility model has the advantages of the water storage type water heater and the instant water heater, and can solve the defects of the water storage type water heater and the instant water heater, has wider application range, saves installation space, and has more flexible installation positions, and requires line load. Small, no need to re-use special wiring, reduce installation costs, and greatly reduce the risk.

The external circulation heating assembly can truly realize the separate heating of water and electricity, basically eliminating leakage. It is safer to use, there is no corrosion in the water tank 1, and no special enamel processing is required.

More temperature detecting devices 21 are arranged on the water supply passage and the outer circulation heating circuit, and the temperature detection accuracy is higher, and the electric power control device 7 has more precise controllable adjustment of the circulating heating components.

The water supply passage is connected with a mixing valve through a pipeline. The mixing valve is a manual adjusting mixing valve or an electric adjusting mixing valve to meet the purpose of adjusting the water temperature. The manual adjustment of the mixing valve is lower in cost, and the electric adjusting mixing valve is adjusted. The temperature is more precise and stable, and can be understood by those skilled in the art, and will not be described again. After the mixing valve is opened, the water supply passage is continuously operated to discharge hot water under the water pressure of the tap water, and the external circulation heating circuit stops working.

In this embodiment, the water outlet end on the outer circulation heating assembly is provided with a temperature detecting device 21 for sensing the water temperature. The technical solution has a very low cost, and the temperature detecting device 2 can set a plurality of detection values according to working conditions, so as to conveniently meet the electric water heater. usage of.

Further, the check valve 5 has a venting passage 51 opposite to the flow direction of the one-way valve 5, and the venting passage 51 communicates with the outside or with the water outlet passage of the electric water heater, and the venting passage 51 is used for the exhaust of the water tank 1 during initial use. Or for use in the pressure relief in the water tank 1 due to an increase in water temperature, the pressure relief passage 51 may be formed by opening a small through hole/slit or capillary on the valve body or the valve core of the check valve 4. It will be understood by those skilled in the art.

The check valve 5 of the embodiment is a pressure type mechanical check valve. When the water supply passage supplies hot water, the pressure of the external circulation heating circuit is lowered, and the check valve 5 cannot be opened, so that the water circulation state is externally circulated. When the heating circuit stops working, the external circulation heating assembly only heats up the hot water supplied by the water supply. In addition, in the water supply state, the circulating water inlet end 13 will supply water to the water tank 1 under the action of the tap water pressure. When the temperature in the water tank 1 is heated to a higher value, the pressure in the water tank 1 and the water supply passage is increased. When the hot water supply is in the early stage, the required hot water flow is very small, and the water supply pressure is lowered. Less, at this time, some hot water still flows through the check valve 5 and flows back into the water tank 1, and continues to circulate until the required hot water flow rate increases, or the water temperature in the water tank 1 falls back (ie, the water tank 1 After the pressure in the water delivery channel, the check valve 5 is completely closed.

Further, the instant electric water heater further includes a tee 4, a circulating water inlet end 13, a water inlet end a of the tee 4, and a first water outlet end b, and the check valve 5 is sequentially connected through the pipeline to constitute the aforementioned outer portion. The circulation heating circuit, the inlet end a and the second outlet end c of the three-way 4 of the circulating water inlet end 13 are sequentially connected by a pipeline to form the aforementioned water supply passage, and the three-way 4 is connected to the external circulation heating circuit in parallel with each other and The layout of the water supply path is easier.

Further, the circulating water inlet end 13 and the hot water outlet end 12 are respectively located at the top of the water tank and At the bottom, the water in the water tank 1 is ensured to be more uniform in temperature during circulation heating, and there is no hot or cold stratification. The cold water added to the water tank 1 does not directly interfere with the hot water near the hot water outlet end 12.

Further, the outer circulation heating assembly includes a heater 2 and a circulation pump 3. The circulation pump 3 can supply the pressure of water circulation to the external circulation heating circuit and the water supply passage, and the heater 2 can realize the hydroelectric separation type heating, basically eliminating leakage and making the use safer.

The heater 2 is externally placed in the water tank 1, so that the structure of the heater 2 is further optimized to meet the true hydroelectric separation. At this time, the heater 2 has a structure in which the heater includes a circular tubular thick film heating element and is located at a thick a heating water channel inside or outside the film heating element, a thick film heating body and a heating water channel as a reciprocating or circumferentially extending water inlet channel and a drainage channel of the anti-electric wall, the two ends of the heating water channel are respectively connected with the water inlet channel and the drainage channel The thick film heating element comprises a circular tube base body, an insulating layer covering the circular tube base body, and a thick film heat-spraying layer disposed on the winding direction of the insulating layer. The inner cavity of the thick film heating element is provided with an inlet water guiding fluid which is provided with a reciprocating extending water inlet passage, a drainage guiding fluid which is arranged to reciprocally extend the drainage channel, and a drainage guide body and a drainage guide. a flow guiding spacer between the fluids, the two ends of the thick film heating body are respectively provided with a water inlet end covering the inlet water guiding body and a water inlet joint cover for the water inlet opening the water inlet passage, covering the drainage guide The water outlet end of the fluid is provided with a water outlet joint cover for the water outlet to open the drainage channel; the heating water channel is formed between the thick film heating body and the inlet water guiding fluid and the drainage guiding fluid. The heater is used as a heat-insulating wall built-in water inlet and outlet wall based on thick film heat as described in Chinese Patent Document No. CN201520159597.4.

Further, the electric water heater further includes a remote controller, and the remote controller is connected to the electric power control device through the wireless module, so as to facilitate remote control of the operation of the water heater.

In addition, when the electric adjusting mixing valve is adopted, the aforementioned one-way valve 5 may be an electronically controlled electromagnetic valve, and the electric adjusting mixing valve acts as a flow detecting device through the controllable control device 6 and the electronically controlled electromagnetic valve, electrically When the water mixing valve is adjusted to discharge water, it can send a signal to the electronically controlled solenoid valve to control its closing.

Second embodiment

Referring to FIG. 2, the main difference between the low-power instant electric water heater having a small-capacity water tank and the first embodiment is that the water tank 1 is provided with a cold water inlet end 11, a hot water outlet end 12 and circulating water. The water end 13 and the three ports are respectively located at different positions of the water tank 1, so that the water temperature of the water tank 1 is more uniform under the non-water supply state, and in the water supply state, the cold water filled into the water tank 1 does not directly interfere with the hot water outlet end 12 Outlet temperature.

In this embodiment, the temperature detecting device 21 is disposed only at the water outlet end of the outer circulation heating assembly, In the non-water supply state (including both normal heating and idle time heating), the external circulation heating circuit can continue to work until the temperature detecting device 21 detects that the outlet water temperature reaches a set value (for example, 60-75 degrees). After calculation and experiment, the water temperature in the water tank 1 will reach the set temperature (such as 50-70 degrees), the external circulation heating circuit stops working, and the water tank 1 preheating work is completed.

Other parts not described, like the first embodiment, will not be repeated.

Third embodiment

Referring to FIG. 3, the main difference between the low-power instant electric water heater having a small-capacity water tank and the first embodiment is that the one-way valve 5 is an electronically controlled electromagnetic valve, and the water supply passage is provided for detecting The flow rate detecting device 8 of the water flow rate, the flow rate detecting device 8 is electrically connected to the electronically controlled solenoid valve by the electric power control device 7, and when the flow rate detecting device 8 detects that there is water flow in the water supply path, it sends a signal to the electronically controlled solenoid valve to control it. Closed, the water heater can stabilize the water supply, and the electronically controlled solenoid valve has higher control precision.

The water outlet end and the water inlet end of the outer circulation heating assembly are respectively provided with a temperature detecting device 21, and the inlet end temperature of the outer circulation heating assembly is similar to the water temperature in the water tank 1, and the outlet water temperature of the outlet end of the outer circulation heating assembly is detected by the temperature detecting device 21. To avoid excessive water temperature.

Other parts not described, like the second embodiment, will not be repeated.

The above embodiments are merely preferred embodiments of the invention, and other embodiments of the invention are possible. Equivalent variations or substitutions may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

A low-power instant electric water heater with a small-capacity water tank, comprising a water tank (1), an external circulation heating assembly and a check valve (5), characterized in that the water tank (1) is provided with a hot water outlet end (12) and circulating water inlet end (13), hot water outlet end (12), external circulation heating assembly, check valve (5) and circulating water inlet end (13) are connected in series through the pipeline to form external circulation heating The circuit, the hot water outlet end (12), and the outer circulation heating assembly are sequentially connected through the pipeline to form a water supply passage.
A low-power instant electric water heater with a small-capacity water tank according to claim 1, wherein a temperature detecting device for sensing the water temperature is provided on the water inlet end and/or the water outlet end of the outer circulation heating assembly ( twenty one).
A low-power instant electric water heater with a small-capacity water tank according to claim 1, characterized in that the water tank (1) is internally provided with a temperature detecting device (21) for sensing the temperature of the water.
A low-power instant electric water heater with a small-capacity water tank according to claim 1, wherein said one-way valve (5) has a venting passage (51) opposite to that of the one-way valve (5); The check valve (5) is a pressure type mechanical check valve; or the check valve (5) is an electronically controlled solenoid valve, and the water supply passage is provided with a flow detecting device (8) for detecting the water flow rate thereof, The flow detecting device (8) is electrically connected to the electronically controlled solenoid valve.
The low-power instant electric water heater with a small-capacity water tank according to claim 1, wherein the instant electric water heater further comprises a tee (4), a circulating water inlet end (13), and a tee ( 4) The inlet end (a) and the first outlet end (b) and the check valve (5) are connected in series through the pipeline, and the inlet end of the circulating water inlet end (13) tee (4) (a) And the second water outlet end (c) is connected in series through the pipeline.
A low power instant electric water heater with a small volume water tank according to claim 1, characterized in that said outer circulation heating assembly comprises a heater (2) and a circulation pump (3).
A low-power instant electric water heater with a small-capacity water tank according to claim 6, wherein the heater (2) comprises a circular tubular thick film heating element, a heating water channel located inside or outside the thick film heating element, a thick water heating body and a heating water channel as a reciprocating or circumferentially extending water inlet channel and a drainage channel of the anti-electric wall, the two ends of the heating water channel are respectively connected with the water inlet channel and the drainage channel; the thick film heating body comprises a round pipe The base body, the insulating layer covering the base of the circular tube, and the thick film heat-spraying layer disposed on the winding direction of the insulating layer.
A low-power instant electric water heater with a small-capacity water tank according to claim 7, wherein the inner cavity of the thick-film heating element is provided with an inflowing water guiding body which is provided with a reciprocatingly extending water inlet passage a drainage guide fluid for reciprocatingly extending the drainage channel, a flow guiding spacer between the inlet water guiding fluid and the drainage guiding fluid, and two ends of the thick film heating body respectively respectively cover the inlet water guiding fluid The water end is provided with a water inlet joint cover for the water inlet to open the water inlet passage, a water outlet end covering the drainage fluid guide, and a water outlet joint cover for the water outlet to connect the drainage channel; the thick film heating body and the water inlet guide The heated water channel is formed between the fluid and the drainage guide fluid.
The low-power instant electric water heater with a small-capacity water tank according to any one of claims 1-8, characterized in that the electric water heater comprises a built-in or external electric power control device (7), and the water supply passage passes through the pipeline. A mixing valve is connected, and the mixing valve is a manual adjusting mixing valve or an electric adjusting mixing valve.
The low-power instant electric water heater with a small-capacity water tank according to claim 9, wherein the electric water heater further comprises a remote controller, and the remote controller is connected to the electric power control device through the wireless module.