CN111561781A

CN111561781A - Scale-free dual-mode water heater

Info

Publication number: CN111561781A
Application number: CN202010515819.7A
Authority: CN
Inventors: 伍柏峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2020-08-21

Abstract

The invention belongs to the field of water heaters, and particularly relates to an electric water heater adopting heat exchange. The invention adopts a heat exchange form, comprises at least one large-volume heat storage bin and at least one small-volume energy storage bin, wherein the heat exchanger is respectively arranged in the heat storage bin and the energy storage bin, and also comprises a pump, water flow circulates in the energy storage bin and the heat storage bin according to the requirement, and the flow and the on-off of the pump are controlled by the pump in an electronic or mechanical way according to the temperature in the energy storage bin and the on-off condition of the water flow. When the temperature of the inlet water is higher, the heater only heats the water in the energy collecting bin, and the effect of instant heating is realized; when the temperature of the inlet water is lower, the heater heats the water in the heat storage bin, and the cold water flows through the heat exchanger to absorb the heat in the heat storage bin and then enters the heat exchanger in the energy collection bin for secondary heating. When the tap water is turned off, the boiled water flows out of the hot water once again due to the high temperature in the energy collecting bin, so that the pump can be operated for a period of time after the water is turned off to eliminate the high-temperature hot water.

Description

Scale-free dual-mode water heater

Technical Field

The invention belongs to the field of water heaters, and particularly relates to an electric water heater adopting heat exchange.

Background

The traditional electric water storage type water heater needs long-term heat preservation and wastes energy, and the hot water rate output rate of the water storage type water heater is generally 60%, so that the bathing requirement can be met only by needing larger volume or higher temperature, and the problem of scale formation can be caused when the temperature of an inner container is higher than 60 ℃. The invention provides a new technical scheme to solve the problems, can realize instant heating and heat storage effects at the same time, does not need preheating and heat preservation of the inner container when the temperature is higher, and does not need repeated heating and heat preservation for a long time in winter. The technical requirements as described above can be achieved by other means, for example, the patent named "a multimode water heater", but in the patent "a multimode water heater", there is a defect that once again boiling water comes out and a hot water is generated within a few minutes after water is shut off, which is a problem caused by the temperature difference of heat exchange (for example, 65 degrees in the energy collecting cavity, about 42 degrees of tap water passing through the heat exchange pipe, after water is shut off, water in the heat exchange pipe has sufficient time to absorb heat energy in the energy collecting bin, and the same water temperature as the energy collecting bin is reached, so that the water is shut off and the hot water is boiled again, and the user is scalded).

In summary, the conventional electric water heater and the electric water heater with the following innovative technology still have some problems, and further technical innovation is needed to solve the problems. The invention utilizes the water pump to control the heat exchange between the energy collecting bin and the heat storage bin, and the water pump can work for a period of time after water is shut off to pump hot water in the energy collecting bin to the heat storage bin so as to reduce the temperature in the energy collecting bin, thereby avoiding the problem of water scalding caused by water shut off and water reopening; meanwhile, in order to improve the efficiency of the heat exchanger (primary heat exchanger) arranged in the heat storage bin, a spray pipe is additionally arranged, a plurality of nozzles can be arranged on the spray pipe like a shower head and are uniformly sprayed on the heat exchanger, and the convection intensity around the primary heat exchanger is increased; the flow proportion of the water flowing through the spray pipe and the energy collecting bin is controlled by sensing the water temperature in the energy collecting bin or simultaneously sensing the temperature of the energy collecting bin and the heat exchanger through the thermal expansion element, and the flow proportion of the water flowing through the spray pipe and the energy collecting bin can be adjusted by adopting a motor or other electric mechanisms according to the water flow state and the temperature of the energy collecting bin. For example, when the temperature in the heat storage bin is lowered in winter, the energy storage bin is expected not to supply heat to the heat storage bin any more, the full power of the heater is used for heating and flowing through the energy storage bin heat exchanger, the heat storage bin is expected to enhance heat exchange to absorb more heat energy, at the moment, the thermal expansion element or the electric mechanism closes the passage to the energy storage bin, and the passage of the spray pipe is fully opened, so that the best effect is achieved. Of course, the flow rate in front of the energy collecting bin and the heat storage bin can also be controlled by controlling the rotating speed of the pump through the speed regulating module, and the scheme is simpler but has a slightly poor effect.

If the cost is not considered, two groups of heaters can be adopted, one group of heaters are assembled in the heat storage bin, the other group of heaters are assembled in the energy collecting bin, the working state and the power of the two groups of heaters are controlled through the electronic control, the sum of the power of the two groups of heaters is not more than the rated power, and the power proportion of the two groups of heaters is distributed according to the condition of water temperature. For example, when the temperature of the outlet water or the temperature of the inner container is higher, the power proportion of the heater in the heat storage bin is high, and along with the lower and lower use temperature, the power proportion of the heater in the energy storage bin is higher and higher until the heater occupies all power. The purpose of the water pump in this way can be three: 1. pumping out the hot water in the energy collecting bin after the water supply is cut off; 2. the efficiency of the primary heat exchanger is enhanced; 3. let the water inner loop in gathering the storehouse for gather the storehouse heat transfer difference in temperature and hang down, thereby also can avoid scalding water (for example accomplish when the heat transfer difference in temperature is within 5 degrees, go out water 42 degrees, only 47 degrees in gathering the storehouse, also can not scald people), these three kinds of effects can be alone or the combination utilization as required.

Disclosure of Invention

The object of the invention is solved by the following technical solutions:

the utility model provides a scale-free bimodulus water heater, includes shell, heating element, heat exchanger, heat storage storehouse, the control unit, hot water joint, cold water joint, still includes the pump, gathers the storehouse, one end and the heat storage storehouse intercommunication of pump, another end and gather the storehouse intercommunication, the heat exchanger is installed respectively in heat storage storehouse and gathering the storehouse, gather the storehouse with there is the rivers passageway between the heat storage storehouse.

Furthermore, the scale-free dual-mode water heater also comprises a thermal expansion element, a push rod, a spring and a spray pipe (14), wherein the spray pipe is arranged in the heat accumulation bin, the position and the structure of a nozzle of the spray pipe are favorable for enhancing the flow of a heat exchange medium around the heat exchanger, the thermal expansion element is assembled in the energy accumulation bin or is thermally coupled with the medium in the energy accumulation bin, the push rod is matched with a push rod of the thermal expansion element, the spring is assembled on the push rod, the thermal expansion element determines the opening length of the push rod according to the temperature in the energy accumulation bin, the flow rate flowing from the pump to the energy accumulation bin and the spray pipe is adjusted, and the push rod resets under the reaction force of the.

Further, the heat collector also comprises a temperature mixing block, the temperature mixing block is thermally coupled with water in the energy collecting bin and the secondary heat exchanger, and the thermal expansion element is installed on the temperature mixing block.

Optionally, the control unit further comprises a speed regulation module and a temperature sensor, the temperature sensor is assembled in the energy gathering bin, and the speed regulation module controls the rotating speed of the pump according to data of the temperature sensor.

Optionally, the energy collecting device further comprises a motor, a spray pipe and a temperature sensor, wherein the spray pipe is installed in the energy collecting bin, the temperature sensor senses the water temperature of the energy collecting bin, and the motor adjusts the flow ratio flowing from the pump to the energy collecting bin and the spray pipe according to the water temperature in the energy collecting bin.

Further, the water heater also comprises a water flow switch, and the pump and the motor determine the working mode according to the state of the water flow switch.

Optionally, the heaters are two or more groups, wherein at least one group is arranged in the energy collecting bin, and at least another group is arranged in the heat storage bin.

Optionally, the heater is mounted within a shaped charge, the shaped charge being mounted externally of the thermal charge.

Furthermore, the power of the two groups of heaters is rated power, and the control mode ensures that the sum of the instant power of the two groups of heaters in any working state is not more than the rated power.

Advantageous effects

The dual-mode water heater utilizing the pump for circulating heating, which is developed by the invention, can solve the problem of high energy consumption caused by heat preservation and heat storage of the traditional electric water storage type water heater all the year round, also solve the problems of high power and small water quantity of an instant water heater, and also solve the problems of water scalding caused by water closing and re-opening of a multi-mode water heater and low primary heat exchange efficiency, and has low cost and popularization value.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings

FIG. 1 is a schematic view of a scale-free dual-mode water heater

FIG. 2 is a schematic view of a scale-free dual-mode water heater

FIG. 3 is a partial schematic view of a temperature mixing block scheme

Fig. 4 is a schematic diagram of a motor-driven valve element structure

FIG. 5 is a schematic view of two heater sets

FIG. 6 is a schematic diagram of two heater circuits

In the figure:

1. the device comprises a shell 2, a heat storage bin 3, a primary heat exchanger 4, a secondary heat exchanger 5, an energy collecting bin 6, a heater 7, a pump 8, a thermal bulb 9, a mandril 10, a spring 11, a turnover plate 12, a cold water joint 13, a hot water joint 14, a spray pipe 15, a temperature mixing block 16, a valve core 17, a second heater 18, a pump connecting pipe 19, a temperature sensor 20, a control unit 21, a motor

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The invention is further illustrated by the following figures and examples.

Example one

Fig. 1 is a schematic structural view of a water heater according to a first embodiment of the present invention, and as shown in fig. 1, the water heater has a heat storage tank 2 with a certain capacity, and a primary heat exchanger 3 is assembled inside the heat storage tank (note that the primary heat exchanger and the secondary heat exchanger may be two parts of the same heat exchanger). The energy collecting bin 5 is arranged outside the heat storage bin 2 in an external mode, so that the purpose of design is favorable for maintenance, the heat radiation of the energy collecting bin is smaller, and the heat efficiency is higher. The heater 6 and the secondary heat exchanger 4 are assembled in the energy collecting bin. The water suction end of the pump 7 is connected with the bottom of the heat storage bin 2 (the water suction end is connected with the heat storage bin because the temperature of water which is not heated by the energy collecting bin is always lower, which is beneficial to the service life of the pump), and the other end is connected with the energy collecting bin 5 and the spray pipe 14. A thermal expansion element 8 (generally adopting a paraffin wax thermal bulb, a mature temperature control accessory) is arranged in the energy gathering bin 5, a push rod of the thermal expansion element is matched with a push rod 9, and a spring 10 is arranged on the push rod 9.

The working mode of the thermal expansion element is as follows: when the heater 6 starts to heat, the pump 7 starts to work (the pump has several control modes, the next section can specially say the control of the pump), the heat storage medium in the energy-collecting bin is heated, when the temperature in the energy-collecting bin reaches the initial opening temperature of the thermal expansion element 8, the push rod of the thermal expansion element overcomes the spring force to push the push rod 9, the push rod 9 pushes the turning plate 11 to rotate, a channel of the pump 7 leading to the energy-collecting bin 5 is opened, at the moment, one part of water passing through the pump returns to the heat-collecting bin through the spray pipe 14, and the other part returns to the heat-collecting bin through the energy. The flow proportion of the two paths of water flows is determined according to the ejection height of the push rod of the thermal expansion element, the ejection height of the push rod is determined by the temperature of the energy-gathering bin, the ejection is longer when the temperature is higher, and the flow of the pump flowing through the energy-gathering bin is larger. When the push rod is ejected to a high value, the turning plate 11 covers the flow channel of the spray pipe 14, the channels of the energy collecting bin are all opened, and water of the pump all passes through the energy collecting bin to quickly take away heat; when the temperature in the energy collecting bin is lower, the volume of a medium in the thermal expansion element 8 is reduced, the push rod is reset under the action of the spring 10, the turnover plate blocks a channel of the energy collecting cavity, the channel of the spray pipe is completely opened, the peripheral medium of the primary heat exchanger flows fastest at the moment, and the heat exchange effect is best.

The working mode of the water heater is as follows: 1. the intelligent mode, when temperature sensor sensed into water temperature or temperature and was higher than certain value, the water heater adopted instant heating mode, and instant heating mode is to open rivers heating, closes rivers stop heating (temperature sensor and rivers switch are all the ripe well-known technique in the trade, do not show), certainly, if the volume that gathers the storehouse is slightly big, in order to reduce the cold water volume of early stage, do not open rivers but only start the start signal time, also can heat in advance to certain settlement temperature gathering the storehouse, for example 45 degrees. In the intelligent mode, the power can be automatically adjusted according to the water inlet or outlet temperature. When the temperature sensor senses that the temperature of inlet water or the temperature is lower than a certain value, the water heater adopts a quick heating mode, the heat storage medium in the heat storage bin can be preheated in the quick heating mode, and the preset temperature of the heat storage bin is automatically set according to the temperature of inlet water or the temperature. 2. The instant heating mode is basically the same as the intelligent mode, and only needs to set parameters manually. 3. The fast heating mode is the same as the fast heating mode in the intelligent mode, but needs to set each parameter manually.

The working mode of the pump is as follows: 1. the pump is started as long as the heater works, and the heater stops and the pump also stops working. 2. When the heater stops working or the water flow switch stops working, the pump works for a while to reduce the water temperature in the energy collecting bin and prevent hot water from flowing out again. 3. And the pump is linked with a temperature sensor (the temperature sensor is a known technology and is not shown), when the temperature in the energy collecting bin is higher than a set value and higher than the temperature in the heat storage bin, the pump works, otherwise, the pump stops working. The above three modes are most typical, and any one or combination of the modes can be adopted according to the product requirements. The logic of the combined use is also very simple, for example, when the water flow switch is started, the 3 rd mode is adopted, but the temperature limit value of the energy-gathering bin starting pump is A; and when the water flow switch is not started, adopting a mode 3, wherein the temperature limit value of the energy collecting bin starting pump is B. . . Etc., which are not described herein in greater detail.

Structure and manufacture: compared with the technology, the invention 'a multimode water heater' invented by the inventor a few years ago is similar to the technology, passes 3C authentication and is produced in large quantities, and the multimode water heater is excellent in structural reliability, process, cost and the like and is far superior to the traditional electric water heater. Only briefly described herein, and as illustrated, only the essential parts relevant to the present invention are shown, the thermal storage silo can be blow molded using inexpensive PP since it is not required to withstand the pressure of tap water. The energy gathering bin can be designed into an upper shell and a lower shell, injection molding is adopted, the upper shell and the lower shell are locked by a silica gel ring sealing screw or a buckle, and the buckle is used as far as possible for quick assembly or automatic assembly and material recovery. The upper and lower shells may also be ultrasonically or induction welded after the inner components are assembled, if maintenance is not a concern. The external joint of the energy-collecting bin and the heat exchanger or the heat storage bin can adopt radial sealing, if radial sealing is adopted, the connection of the energy-collecting bin and the heat storage bin can adopt a buckle (in automatic production, the buckle is an optimal mode) due to the long stroke of a sealing matching surface; if the joint adopts end face sealing, the sealing performance depends on pressure, and the joint cannot be fastened only by screws or cams due to the adoption of buckles. The pump can be connected with each component by adopting a hose or a threaded interface and the like.

Example two

Fig. 2 is a horizontal structure, which is a structural schematic diagram of a second embodiment of the present invention, in this embodiment, an energy collecting bin 5 is assembled inside a heat storage bin 2, a primary heat exchanger 3 and a secondary heat exchanger 4 are two parts of the same component, the secondary heat exchanger 4, a heater 6 and a temperature sensor 19 are assembled inside the energy collecting bin 5, the primary heat exchanger is assembled at the top of the heat storage bin, one end of a pump 7 is communicated with the heat storage bin, the other end is communicated with the energy collecting bin through a hose 18, and one end of the energy collecting bin is provided with a through hole to be communicated with the heat storage bin.

The first embodiment is a simplified version, has no spray pipe and no thermal expansion element, the control mode of the heater is the same as that of the first embodiment, and also has multiple working modes, but the control mode of the pump is different, in the first embodiment, the pump can always work at full power without controlling the rotating speed of the pump, but in the first embodiment, the rotating speed must be controlled, otherwise, a reasonable temperature cannot be maintained in the energy collecting bin, so that the water heater cannot work normally, and the heat balance function of the energy collecting bin is damaged. The control unit 20 adjusts the rotation speed of the pump 7 according to the value of the temperature sensor 19 in the energy collecting bin, and the rotation speed can be controlled in a voltage adjusting or frequency adjusting mode according to different pump structures. The basic principle of controlling the rotating speed is as follows: the pump is operated at full speed with a thermal equilibrium reference temperature (e.g., 70 degrees) below which the pump is not rotating or rotating at a low speed and above which the pump is gradually increasing in speed to a certain maximum reference (e.g., 80 degrees).

EXAMPLE III

Fig. 3 is a schematic partial structure diagram of a third embodiment of the present invention, which is different from the first embodiment in that a temperature mixing block 15 is added, and the rest is the same as the first embodiment. The purpose of the temperature mixing block is to comprehensively consider the temperature of the heat exchange tube and the water temperature of the energy collecting bin so as to achieve the purpose of reducing the initial opening temperature of the thermal expansion element. In the first embodiment, in order to heat the water in the heat exchanger to the bathing temperature by the energy collecting bin and realize the function of heat balance when the temperature of the energy storing bin is changed rapidly, the temperature bulb in the energy collecting bin is generally selected to have a relatively high initial opening temperature (the specific temperature value is kept secret). Therefore, in the solution of the first embodiment, there is a problem that the bulb is turned off at a higher temperature, which may cause the pump to be unable to drain the high-temperature water in the energy collecting bin after the water is turned off, and which may cause the problem of scalding of the boiled water within a few minutes after the water is turned off (of course, this may not be the case, since the bulb is turned on and off in a course, generally in tens of seconds, in which the pump has already drained the hot water, and this time can be adjusted by the structural design). In order to solve the problem, the part of the temperature mixing block is additionally arranged in the embodiment, the temperature mixing block can be made of metal materials with good temperature conductivity such as copper, brass, aluminum alloy and the like, and if the heat storage medium of the water heater is water, the material of the temperature mixing block also needs to be corrosion resistant. The structure of the temperature mixing block enables the temperature mixing block to exchange heat with the heat exchanger and also exchange heat with media in the energy collecting bin, the weighted average of the temperatures of the temperature mixing block and the media is the average temperature of the temperature mixing block, and the weighted value can be adjusted by adjusting the contact area with the heat exchanger or the energy collecting bin.

The working principle of the embodiment is as follows: when the heater works and the water heater does not start water flow, the energy collecting bin and the heat exchanger therein are heated rapidly, the push rod of the thermal expansion element is pushed open, the channel of the energy collecting bin is opened, and the hot water of the energy collecting bin is pumped to the heat storage bin by the water pump and the process is continued all the time. When the water heater starts water flow, if the temperature in the heat storage bin is lower or room temperature, the temperature of the front section of the heat exchanger in the energy collection bin is lower, the temperature of the temperature mixing block 15 is reduced to be lower than the initial opening temperature (for example, lower than 45 ℃) of the thermal expansion element, a passage from the pump to the energy collection cavity is closed, and the heater only heats the water in the energy collection bin and takes away heat energy through the water flow of the heat exchanger; under the water flow starting state, if the temperature in the heat storage bin is higher, tap water absorbs heat energy in the heat storage bin through the first-stage heat exchanger for preheating, the temperature of the front section of the heat exchanger in the energy collection bin is also higher, the temperature of the heat exchanger and the temperature of the energy collection cavity are weighted and averaged to enable the temperature of the temperature mixing block to be higher than the initial opening temperature of the thermal expansion element 8, the channel is opened, and the pump takes away redundant heat in the energy collection bin. The biggest difference of the mode is that the factors of opening or closing water flow, temperature in the heat storage bin, temperature in the energy collection bin, flow speed of water in the heat exchanger and the like can be comprehensively considered, the effect is better than that of the first embodiment, and meanwhile, the initial opening temperature of the thermal expansion element can be reduced, so that the working condition of the energy collection bin is improved.

Example four

Fig. 4 is a partial schematic view of the 4 th embodiment of the present invention, in this embodiment, a motor is used to drive the valve core 16 to move to adjust the water flow channel, a temperature sensor is installed in the energy collecting bin, a water flow switch (the temperature sensor and the water flow switch are well known technologies and are not shown) is installed at the water inlet, the motor determines the opening degree according to the water temperature in the energy collecting bin and the state of the water flow switch, and the motor generally uses a stepping motor to facilitate the accurate control of the opening degree of the valve core 16. The rest is the same as the embodiment and is not described in more detail.

EXAMPLE five

Fig. 5 and fig. 6 are a schematic structural diagram and a schematic electronic control diagram of a fifth embodiment, respectively, the fifth embodiment is different from the previous 4 embodiments in that the fifth embodiment has two sets of heaters, and one set of heaters is arranged in the energy collecting bin and is used for heating media in the energy collecting bin to realize instant heating effect; and the group of the heat storage bins is assembled in the heat storage bins and used for heating the medium in the heat storage bins. The most advantages of this way are: can keep constant temperature water outlet for a long time and improve the working condition of the energy collecting bin (the reason is described later). The pump is only used for reducing the temperature of the energy collecting bin after water is shut down, and the convection speed of the heat storage medium around the primary heat exchanger is increased. As shown in fig. 6, two sets of heaters are respectively controlled by two thyristors in the following manner: 1. the preconditions are as follows: and (4) a water flow is not started, and a quick heating mode (heating the heat storage bin is needed). The control mode is as follows: the second heater is operated at full power. 2. The preconditions are as follows: water flow starting and quick heating mode. The control mode is as follows: the second heater works, the heaters in the energy-gathering bin work according to the outlet water temperature, the outlet water temperature of the heat exchanger is generally considered to be constant at 55 degrees (or other temperatures), for example, when the outlet water temperature of the heat exchanger is higher than 55 degrees, the second heater works in full power, the heaters in the energy-gathering bin do not work, when the outlet water temperature of the heat exchanger is lower than 55 degrees, two groups of heaters work simultaneously, the sum of duty ratios of two thyristors is 1, namely when the heaters in the energy-gathering bin work, the second heater reduces corresponding power, the sum of the duty ratios of the two heaters is equal to the rated power, and the power of the heaters in the energy-gathering bin is gradually increased along with the reduction of the water temperature in the energy-gathering bin until the heaters work in full power; when the heater in the energy collecting bin works at full power, the second heater does not work. 3. The preconditions are as follows: i.e., hot mode (i.e., hot mode with the heater on only if water flow is enabled, and hot mode with the second heater off). The control mode is as follows: the heater in the energy collecting bin works, and the power of the heater is controlled according to the outlet water temperature of the heat exchanger. The pump is started to cool the high-temperature hot water in the energy collecting cavity after the water flow is turned off every time, or the water is sprayed to the first-stage heat exchanger through the spray pipe when the water outlet temperature does not meet the bathing requirement, so that the heat exchange efficiency is improved, and the water outlet temperature is increased.

The above examples are not intended to be exhaustive of all structures and methods, and all combinations of the above aspects and any aspects that may be readily devised by the present invention are within the scope of this patent.

Claims

1. The utility model provides a scale-free bimodulus water heater, includes shell (1), heater (6), heat exchanger, heat storage storehouse (2), control unit (20), hot water connector (13), cold water connector (12), its characterized in that: still include pump (7), gather ability storehouse (5), the one end and the storehouse of heat accumulation (2) intercommunication of pump (7), the other end with gather ability storehouse (5) intercommunication, the heat exchanger is installed respectively in heat accumulation storehouse and gathering ability storehouse, gather ability storehouse (5) with there is the rivers passageway between heat accumulation storehouse (2).

2. The scaleless dual mode water heater according to claim 1, wherein: the heat exchanger is characterized by further comprising a thermal expansion element (8), a push rod (9), a spring (10) and a spray pipe (14), wherein the spray pipe (14) is installed in the heat accumulation bin (2), the position and the structure of a nozzle of the spray pipe are favorable for enhancing the flow of a heat exchange medium around the heat exchanger, the thermal expansion element (8) is assembled in the energy accumulation bin (5) or is thermally coupled with the medium in the energy accumulation bin (5), the push rod (9) is matched with a push rod of the thermal expansion element, the spring (10) is assembled on the push rod, the thermal expansion element (7) determines the opening length of the push rod (9) according to the temperature in the energy accumulation bin (6), the flow rate flowing from the pump (7) to the energy accumulation bin (5) and the spray pipe (14) is adjusted, and the push rod (9) is reset under the reactive force.

3. The scaleless dual mode water heater according to claim 2, wherein: the energy-collecting device is characterized by further comprising a temperature mixing block (15), the temperature mixing block (15) is in thermal coupling with water in the energy-collecting bin (5) and the secondary heat exchanger (4), and the thermal expansion element (8) is installed on the temperature mixing block (15).

4. The scaleless dual mode water heater according to claim 1, wherein: the control unit (20) further comprises a speed regulating module and a temperature sensor (19), the temperature sensor (19) is assembled in the energy gathering bin (5), and the speed regulating module controls the rotating speed of the pump (7) according to data of the temperature sensor (19).

5. The scaleless dual mode water heater according to claim 1, wherein: the energy collecting device is characterized by further comprising a motor (21), a spray pipe (14) and a temperature sensor, wherein the spray pipe (14) is installed in the energy collecting bin (2), the temperature sensor senses the water temperature of the energy collecting bin, and the motor (21) adjusts the flow proportion flowing from the pump (7) to the energy collecting bin (5) and the spray pipe (14) according to the water temperature in the energy collecting bin (5).

6. The scaleless dual mode water heater according to claim 1 or 5, wherein: the water flow switch is also included, and the pump and the motor determine the working mode according to the state of the water flow switch.

7. The scaleless dual mode water heater according to claim 1, 2 or 5, wherein: the heaters are two groups or a plurality of groups, wherein at least one group is assembled in the energy collecting bin, and at least the other group is assembled in the heat storage bin.

8. The scaleless dual mode water heater according to claim 1, wherein: the heater is assembled in the energy-gathering bin, and the energy-gathering bin is assembled outside the heat storage bin.

9. The scaleless dual mode water heater according to claim 7, wherein: the power of the two groups of heaters is rated power, and the control mode ensures that the sum of the instant power of the two groups of heaters in any working state is not more than the rated power.