WO2014059894A1

WO2014059894A1 - Leakage-proof device for water storing container and water heater

Info

Publication number: WO2014059894A1
Application number: PCT/CN2013/084991
Authority: WO
Inventors: 万华新; 邵小荣; 茹兴鹏
Original assignee: 艾欧史密斯(中国)热水器有限公司
Priority date: 2012-10-15
Filing date: 2013-10-10
Publication date: 2014-04-24
Also published as: CN102878686A; CN103216939A

Abstract

A leakage-proof device for a water storing container comprises a first port (1) communicating with a water supply pipeline (4), a second port (2) communicating with the water storing container (5), and a third port (3) communicating with a water use end (6). The second port (2) is internally provided with a water inlet cavity (21) and a water outlet cavity (22), which do not communicate with each other; a first water flow passageway (11) is arranged between the first port (1) and the water inlet cavity (21) and is internally provided with an on-off control device (12), and the on-off control device (12) can turn on or off the water inlet cavity (21). A second water flow passageway (31) is arranged between the third port (3) and the water outlet cavity (22). Further disclosed is a water heater comprising the leakage-proof device for a water storing container.

Description

Anti-leakage device for water storage container and water heater

Technical field

The present invention relates to an anti-leakage device and a water heater, and more particularly to an anti-leakage device and a water heater for a water storage container in the field of fluid delivery pipe control technology. Background technique

At present, the water heater is generally connected directly to the water source during installation, and the water storage tank of the water heater will undergo oxygen evolution and hydrogen evolution reaction due to the action of the primary battery, which is likely to cause corrosion perforation and eventually lead to leakage of the water storage container, and leakage will occur due to the existing The water storage container is connected to the water source to cause the leakage to continue, resulting in a large-area flooding accident and serious damage.

In order to solve this problem, the Chinese utility model patent No. 200820006351. 3 discloses an electric water heater with a leak alarm and water cut. The lower part of the electric water heater is provided with a water storage tray, and one or more pairs are installed in the water storage tray. The electrode, the inlet pipe is equipped with a water inlet controller, the electrode or the water inlet controller and the signal processor are connected by a signal control line, the signal processor receives the leakage signal of the electrode, emits an audible or optical alarm, and advances The water controller sends off the water source signal to cut off the water supply.

In addition, Chinese Patent Application No. 200910033981. 9 discloses a water heater including a water storage tank and an inlet pipe and an outlet pipe communicating with the inner tank to transfer water flowing into the inner tank and out of the inner tank for heating The heat source of water in the inner tank, and the audio detector for detecting the audio change caused by the leak of the inner tank, once the inner tank leaks, the corresponding audio change can be detected, thereby taking corresponding measures to reduce Small impact on the surrounding environment due to leakage.

It can be seen that the above prior art requires the detection sensing system, the signal processing system and the water inlet controller to work together to cut off the water after leakage, which not only requires high detection detection system, but also causes insensitive reaction. The alarm and cut-off control are not timely. If the reaction is sensitive, it is prone to false alarms and malfunctions, and additional power supply is required. The structure is complicated, and it also needs to prevent electric shock and occupy too much space. Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to provide an anti-leakage device for a water storage container, which can cut off the communication between the water source and the water storage container through the on-off control device, and avoid the continuous water leakage problem when the water storage container is corroded and perforated.

Another object of the present invention is to provide a water heater having an anti-leakage device for a water storage container, which can cut off the connection between the water source and the water storage container through the on-off control device of the anti-leakage device of the water storage container to avoid water storage. Corrosion of the container Continuous water leakage problems during piercing.

The above object of the present invention can be achieved by the following technical solutions:

The invention provides an anti-leakage device for a water storage container, and the anti-leakage device of the water storage container has:

a first port connected to the water supply line;

a second port, which is connected to the water storage container, wherein the second port is provided with a water inlet chamber and a water outlet chamber, and the water inlet chamber and the water outlet chamber are not connected to each other, the first a first water flow channel is disposed between the port and the water inlet chamber, and the first water flow channel is provided with an on/off control device, and the on/off control device can open or close the water inlet chamber;

a third port is connected to the water end, and a second water flow channel is disposed between the third port and the water outlet chamber.

In a preferred embodiment, the second port is composed of an inner tube and an outer tube sleeved outside the inner tube, the inner tube has an inner passage, and the inner tube and the outer tube are formed with An annular passage, the inner passage forming the water inlet chamber, the annular passage forming the water outlet chamber, or the annular passage forming the water inlet chamber, the inner passage forming the water outlet chamber.

In a preferred embodiment, the upper end of the inner tube is integrally formed on the inner wall of the upper end of the outer tube, or the upper end of the inner tube is screwed to the inner wall of the upper end of the outer tube.

In a preferred embodiment, the second port is composed of a tube body and a partition plate passing through the tube body, and the inner passage of the tube body is divided into two chambers by the partition plate. One of the chambers forms the water inlet chamber and the other chamber forms the water outlet chamber.

In a preferred embodiment, the on/off control device has one or more through holes, and the third port communicates with the first port through the one or more through holes.

L〜2毫米。 The preferred diameter of the through hole is 0. l~2mm.

In a preferred embodiment, the on/off control device is provided with a drive member that pushes the on/off control device to close the water inlet chamber.

In a preferred embodiment, the driving member is an elastic supporting portion, one end of the elastic supporting portion abuts against the on-off control device, and the other end of which is abutted against an inner wall of the leakage preventing device of the water storage container Pick up.

In a preferred embodiment, the elastic support portion is a spring.

In a preferred embodiment, the driving component is a magnetic driving portion, and the magnetic driving portion includes a first magnetic member and a second magnetic member having the same polarity, and the first magnetic member is mounted on the on/off control device Above, the second magnetic member is mounted on an inner wall of the leakage preventing device of the water storage container.

In a preferred embodiment, a check valve is disposed in the second water flow passage. In a preferred embodiment, a filter screen is disposed in the first water flow channel.

In a preferred embodiment, the on-off control device is made of an elastic film.

In a preferred embodiment, the elastic mold is a rubber film or a film.

The present invention also provides a water heater having a leakage preventing device for a water storage container, comprising: a water storage container and an anti-leakage device of the water storage container connected to the water storage container, the water storage container having a water inlet And the water outlet, the leakage preventing device of the water storage container has:

a first port connected to the water supply line;

a second port connected to the water storage container, wherein the second port is provided with a water inlet chamber and a water outlet chamber, the water inlet chamber and the water outlet chamber are not connected to each other, the water inlet The chamber is in communication with the water inlet, the water outlet chamber is in communication with the water outlet, and a first water flow channel is disposed between the first port and the water inlet chamber, the first water flow channel An on/off control device is provided, the on/off control device can open or close the water inlet chamber; a third port is connected to the water end, and the third port is disposed between the water outlet chamber and the water outlet chamber The second water flow channel. In a preferred embodiment, the second port is composed of an inner tube and an outer tube sleeved outside the inner tube, the inner tube has an inner passage, and the inner tube and the outer tube are formed with An annular passage, the inner passage forming the water inlet chamber, the annular passage forming the water outlet chamber, or the annular passage forming the water inlet chamber, the inner passage forming the water outlet chamber.

L〜2毫米。 The preferred diameter of the through hole is 0. l~2mm.

The anti-leakage device and the water heater of the water storage container of the present invention have the advantages and advantages of: the on-off control device disposed at the upper end of the water inlet chamber of the anti-leakage device of the water storage container, without the installation of the detection system and the addition In the case of the power source, the connection between the water source and the water storage container is cut off in a timely and effective manner, thereby avoiding the continuous water leakage problem when the water storage container is corroded and perforated, and ensuring the safe use of the water storage container of the water heater. DRAWINGS

In order to more clearly illustrate the technical solution in the embodiment of the present invention, the following needs to be used in the description of the embodiment. BRIEF DESCRIPTION OF THE DRAWINGS The drawings in the following description are merely illustrative of some embodiments of the present invention, and those of ordinary skill in the art may also Other drawings are obtained.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front elevational view showing an anti-leakage device of a water storage container of the present invention.

Fig. 2 is a front cross-sectional view showing the leakage preventing device of the water storage container of the present invention.

Fig. 3 is a front cross-sectional view showing another embodiment of the leakage preventing device of the water storage container of the present invention.

Fig. 4 is a front cross-sectional view showing the opening and closing control device for the leakage preventing device of the water storage container of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiment 1

As shown in Figures 1 and 2, the present invention provides an anti-leakage device for a water storage container having a first port 1, a second port 2 and a third port 3. Wherein: the first port 1 is connected to the water supply line 4; the second port 2 is connected to the water storage container 5, and the second end 2 is provided with a water inlet chamber 21 and a water outlet chamber 22, the The water chamber 21 and the water outlet chamber 22 are not in communication with each other, and a first water flow passage 11 is disposed between the first port 1 and the water inlet chamber 21, and the first water flow passage 11 is provided with a passage. The control device 12, the on/off control device 12 can open or close the water inlet chamber 21; the third port 3 is connected to the water end 6, and the third port 3 is disposed between the water outlet chamber 22 and the water outlet chamber 22. There is a second water flow passage 31.

Specifically, the first port 1 is formed by a cylindrical pipe body for connection with external tap water or other water supply pipe 4 to allow external water supply to flow into the water inlet chamber 21 of the second port 2 through the first port 1. The third port 3 is formed by a columnar tube body, which is arranged side by side with the first port 1, and the third port 3 is for connecting with the external water terminal 6, which can be, for example, a water tap or other water switch device, the third port 3 receives the water supply from the outlet chamber 22 of the second port 2. In the present invention, a communication cavity 13 is provided between the first port 1 and the third port 3.

The second port 2 is located below the communication chamber 13, and the water inlet chamber 21 communicates with the first port 1 through the first water flow passage 11, and the water outlet chamber 22 communicates with the third port 3 through the second water flow passage 31. Both ends of the communication chamber 13 are opposed to the first water flow channel 11 and the second water flow channel 31, respectively.

In an embodiment, the second port 2 is composed of an inner tube 23 and an outer tube 24 sleeved outside the inner tube 23. The inner tube 23 has an inner passage 231, and an annular passage 241 is formed between the inner tube 23 and the outer tube 24. , the inner channel 231 forms the water inlet The chamber 21, the annular passage 241 forms the outlet chamber 22, or the annular passage 241 forms the inlet chamber 21, and the inner passage 231 forms the outlet chamber 22. Further, the upper end of the inner tube 23 is opposite to the communication chamber 13, and the inner passage 231 of the inner tube 23 communicates with the first water flow passage 11 through the communication chamber 13, and the upper end of the inner tube 23 is integrally formed on the inner wall of the upper end of the outer tube 24. The upper end of the inner tube 23 can be screwed to the inner wall of the upper end of the outer tube 24; the upper end side wall of the outer tube 24 is provided with a water outlet 242 through which the annular passage 241 communicates with the second water flow passage 31.

As shown in FIG. 3, in another embodiment, the second port 2 may also be composed of a tube body 25 and a partition plate 26 disposed in the tube body 25. The inner passage of the tube body 25 is separated by a partition plate 26. A chamber 251 and a chamber 252 are formed, one of which forms a water inlet chamber 21 and the other chamber 252 forms a water chamber 22. Further, the upper end of the chamber 251 (that is, the water inlet chamber 21) formed by the partition plate 26 and the tube body 25 is opposed to the communication chamber 13, and the chamber 251 passes through the communication chamber 13 and the first water flow passage 11 A water outlet 242 is defined in the side wall of the tubular body 25 where the partitioning plate 26 and the chamber 252 (ie, the water outlet chamber 22) is formed, and the chamber 252 passes through the water outlet 242. It is in communication with the second water flow passage 31.

The on-off control device 12 is located at the upper end of the water inlet chamber 21, which can open or close the water inlet chamber 21, so that the water supply of the first port 1 can be controlled to flow through or not through the water inlet chamber 21 of the second port 2. Inside the water storage container 5. In the present invention, the on-off control device 12 is made of an elastic film, which may be a rubber film or a film. The on-off control device 12 is provided with one or more through holes 121, and the through holes 121 are opened. On the on-off control device 12 between the first water flow channel 11 and the communication cavity 13, the third port 3 can communicate with the first port 1 through the through holes 121 and the communication cavity 13, and the apertures of the through holes 121 1 2 2 The diameter of the through hole 121 is 0.11. The diameter of the through hole 121 is 0. 1 2

According to an embodiment of the invention, a check valve 7 is provided in the second water flow passage 31. Specifically, one end of the second water flow passage 31 communicates with the water outlet 242 of the water outlet chamber 22, and the other end thereof is provided with an end cover 8, and the upper end of the second water flow passage 31 communicates with the third port 3, and the check valve 7 is disposed. Between the end cap 8 and the water outlet 242 of the water outlet chamber 22, which is a spring cone valve, the spring 72 end of the check valve 7 abuts against the end cap 8 and the other end abuts against a cone 71. The cone 71 is blocked by the action of the spring 72 at the water outlet 242 of the water outlet chamber 22 so that the water flow can only flow in a direction flowing out of the water outlet 242 of the water outlet chamber 22.

According to an embodiment of the invention, a screen 9 is provided in the first water flow channel 11. Specifically, the outer end of the first water flow channel 11 is screwed with a fixing bolt 10, and the filter screen 9 is fixed in the first water flow channel 11 by the fixing bolt 10. The filter mesh 9 can be made of various suitable materials, such as textile fibers. A net or a metal filter or the like is used to filter and purify the water supply of the first port 1 through the screen 9.

Please refer to FIG. 4, the working process of the anti-leakage device of the water storage container is as follows: When the user opens the water end 6, and the water supply line 4 supplies water to the first port 1, since the third port 3 is released from pressure Water pressure is less than the first port The water inlet pressure of the water inlet and outlet control device 12 is separated from the upper end of the water inlet chamber 21 of the second port 2 by the water pressure on both sides. At this time, the water inlet of the first port 1 passes through the first water flow channel 11 And communicating with the cavity 13 into the water inlet chamber 21 of the second port 2, thereby ensuring that the water of the water storage container 5 is always replenished; when the water terminal 6 is closed, the communication through the through hole 121 of the on/off control device 12 is passed. The water pressure of the third port 3 is quickly equal to the water pressure of the first port 1. At this time, the on-off control device 12 is brought closer to the upper end of the inlet chamber 21 of the second port 2 by the change of the pressure difference on both sides thereof. And blocking the upper end of the inlet chamber 21, at this time, if the water storage container 5 leaks, the check valve 7 provided in the second water flow passage 31 ensures that the water flow can only flow from the water outlet chamber 22 through the water outlet 242. The second water flow path 31, which then flows out from the third port 3, cannot flow in the opposite direction, so that the pressure in the water storage container 5 is reduced by the leakage of the water storage container 5, while the water storage container 5 and the water inlet chamber 21 is connected, so the water pressure in the inlet chamber 21 is correspondingly reduced, resulting in continuity The pressure difference on both sides of the control device 12 gradually increases and the on-off control device 12 tightly seals the upper end of the inlet water chamber 21, so that the water storage in the water storage container 5 is not replenished, and at most the water storage container 5 The water is completely leaked, thus automatically avoiding continuous leakage.

The anti-leakage device of the water storage container of the present invention cuts the water source and the water storage container in time and without the installation of the detection system and the external power supply through the on/off control device 12 disposed at the upper end of the water inlet chamber 21 The communication of 5 avoids the continuous water leakage problem when the water storage container 5 is corroded and perforated, and the use of the water storage container 5 is ensured.

According to an embodiment of the present invention, in order to enable the on-off control device 12 to operate more accurately, to ensure that the on-off control device 12 can completely block the flow of water into the water storage container 5 when leakage occurs, in the present invention The on/off control device 12 is provided with a driving member 14, and the driving member 14 pushes the on/off control device 12 to close the water inlet chamber 21. In an embodiment, the driving member 14 can be an elastic supporting portion, and the elastic supporting portion is a spring. Of course, in other embodiments, the elastic supporting portion can also adopt other materials and structures known to those skilled in the art. The elastic support member, such as a rubbery elastic support member, is not limited herein. One end of the elastic support portion abuts against the on-off control device 12, and the other end abuts against the inner wall of the leakage preventing device of the water storage container, that is, the top wall of the communication chamber 13.

In another embodiment, the driving component 14 can be a magnetic driving portion, and the magnetic driving portion includes a first magnetic member and a second magnetic member having the same polarity, and the first magnetic member is mounted on the on-off control device 12, The second magnetic member is mounted on the inner wall of the leakage preventing means of the water storage container, that is, on the top wall of the communication chamber 13. Preferably, the line connecting the geometric center of the first magnetic member and the geometric center of the second magnetic member is perpendicular to the port plane of the upper end of the inlet chamber 21 to bring the on-off control device 12 into contact with the port at the upper end of the inlet chamber 21. The end face seal can be formed to avoid water leakage. Due to the principle of repulsion of the same magnetic pole, a repulsive force is generated between the first magnetic member and the second magnetic member, so that the on-off control device 12 to which the first magnetic member is mounted is subjected to a spring-like supporting force, thereby being magnetically driven. Ministry It can function similarly to the elastic support. Embodiment 2

As shown in FIGS. 1-4, the present invention also provides a water heater having a leakage preventing device for a water storage container, comprising a water storage container 5 and a water storage container connected to the water storage container 5 for preventing leakage The water storage container 5 has a water inlet 501 and a water outlet 502, and the leakage prevention device 100 of the water storage container has a first port 1, a second port 2 and a third port 3, wherein: the first port 1 is connected to the water supply line 4; the second port 2 is connected to the water storage container 5, and the second port 2 is provided with a water inlet chamber 21 and a water outlet chamber 22, and the water inlet chamber 21 and the chamber It is described that the water chambers 22 are not in communication with each other, the water inlet chamber 21 is in communication with the water inlet 501, the water outlet chamber 22 is in communication with the water outlet 502, and the first port 1 to the inlet A first water flow channel 11 is disposed between the water chambers 21, and the first water flow channel 11 is provided with an on/off control device 12, and the on/off control device 12 can open or close the water inlet chamber 21; The three ports 3 are connected to the water end 6 , and the third port 3 is disposed between the water outlet chamber 22 . The second water flow channel 31.

Specifically, the structure, working principle, and beneficial effects of the anti-leakage device 100 of the water storage container in the present embodiment are the same as those in the first embodiment, and are not described herein again. The water leakage preventing device 100 of the water storage container is connected to the water storage container 5 through its second port 2, so that the water heater formed by the combination of the two has the leakage preventing function of the leakage preventing device 100 of the water storage container.

The working process of the water heater is as follows: When the user opens the water end 6, and the water supply line 4 supplies water to the first port 1 of the anti-leakage device 100 of the water storage container, the water pressure after the third port 3 is released is less than the first The inlet water pressure of a port 1 , the on-off control device 12 will be away from the upper end of the inlet chamber 21 of the second port 2 under the action of the water pressure on both sides, at which time, the inlet water of the first port 1 passes through the first water flow. The passage 11 and the communication chamber 13 flow into the water inlet chamber 21 of the second port 2, thereby ensuring that the water of the water storage container 5 of the water heater is always replenished; when the water end 6 is closed, the leakage preventing device passing through the water storage container The communication of the through hole 121 on the on/off control device 12 of 100, the water pressure of the third port 3 is rapidly equal to the water pressure of the first port 1, and at this time, the pressure difference of the on/off control device 12 changes on both sides thereof. Down to the upper end of the inlet chamber 21 of the second port 2 and close the upper end of the inlet chamber 21, at this time, if the water storage container 5 of the water heater leaks, and because of the one-way provided in the second water flow passage 31 The valve 7 ensures that the water flow can only flow from the water outlet 502 through the water outlet chamber 22 The second water flow path 31, which then flows out of the third port 3, cannot flow in the opposite direction; therefore, the pressure in the water storage container 5 decreases as the water storage container 5 leaks, while the water storage container and the water inlet chamber 21 It is connected, so that the water pressure in the water inlet chamber 21 is correspondingly reduced, and the pressure difference between the two sides of the on-off control device 12 is gradually increased, and the on-off control device 12 is tightly sealed to block the upper end of the inlet water chamber 21, so The water stored in the water storage container 5 is not replenished, and at most, the water in the water storage container 5 is completely leaked, thereby automatically avoiding continuous leakage. The water heater of the present invention cuts off the water source in time and without the installation of the detection system and the external power supply through the on/off control device 12 disposed at the upper end of the water inlet chamber 21 of the anti-leakage device 100 of the water storage container. The communication of the water storage container 5 avoids the continuous water leakage problem when the water storage container 5 of the water heater is corroded and perforated, thereby ensuring the safety of the water heater.

The above is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention.

Claims

Claim

An anti-leakage device for a water storage container, characterized in that: the leakage preventing device of the water storage container has: a first port connected to the water supply pipe;

2 . The anti-leakage device of a water storage container according to claim 1 , wherein the second port is composed of an inner tube and an outer tube sleeved outside the inner tube, wherein the inner tube has an inner tube a passage, an annular passage formed between the inner tube and the outer tube, the inner passage forming the water inlet chamber, the annular passage forming the water outlet chamber, or the annular passage forming the inlet a water chamber, the inner passage forming the water outlet chamber.

The anti-leakage device for a water storage container according to claim 2, wherein an upper end of the inner tube is integrally formed on an inner wall of an upper end of the outer tube, or an upper end of the inner tube is screwed at the inner end The upper end inner wall of the outer tube is described.

The anti-leakage device of the water storage container according to claim 1, wherein the second port is composed of a tube body and a partition plate penetrating the tube body, the tube body The inner passage is partitioned into two chambers by the dividing plate, one of the chambers forming the water inlet chamber and the other chamber forming the water outlet chamber.

The anti-leakage device for a water storage container according to claim 1, wherein the on-off control device has one or more through holes, and the third port passes through the one or more The through hole is in communication with the first port.

1〜2。 The diameter of the through hole is 0. 1~2

The leakage preventing device for a water storage container according to claim 1, wherein the on/off control device is provided with a driving member, and the driving member pushes the on/off control device to close the water inlet Chamber.

The leakage preventing device for a water storage container according to claim 7, wherein the driving member is an elastic supporting portion, and one end of the elastic supporting portion abuts against the on-off control device, and the other One end abuts against the inner wall of the leakage preventing device of the water storage container.

The leakage preventing device for a water storage container according to claim 8, wherein the elastic supporting portion is a spring.

The leakage preventing device for a water storage container according to claim 7, wherein the driving member is a magnetic driving portion, and the magnetic driving portion includes a first magnetic member and a second magnetic member having the same polarity The first magnetic member is mounted on the on-off control device, and the second magnetic member is mounted on an inner wall of the leakage preventing device of the water storage container.

The leakage preventing device for a water storage container according to claim 1, wherein a check valve is provided in the second water circulation passage.

The leakage preventing device for a water storage container according to claim 1, wherein a filter screen is provided in the first water circulation channel.

The anti-leakage device for a water storage container according to claim 1, wherein the on-off control device is made of an elastic film.

The leakage preventing device for a water storage container according to claim 13, wherein the elastic mold is a rubber film or a film.

A water heater, comprising: a water storage container; and a leakage preventing device of a water storage container connected to the water storage container, the water storage container having a water inlet and a water outlet, the water storage The leakage preventing device of the container has: a first port connected to the water supply pipe;

a second port connected to the water storage container, wherein the second port is provided with a water inlet chamber and a water outlet chamber, the water inlet chamber and the water outlet chamber are not connected to each other, the water inlet The chamber is in communication with the water inlet, the water outlet chamber is in communication with the water outlet, and a first water flow channel is disposed between the first port and the water inlet chamber, the first water flow channel An on/off control device is provided, the on/off control device can open or close the water inlet chamber; a third port is connected to the water end, and the third port is disposed between the water outlet chamber and the water outlet chamber The second water flow channel.

The water heater according to claim 15, wherein the second port is composed of an inner tube and an outer tube sleeved outside the inner tube, the inner tube has an inner passage, and the inner tube and Forming an annular passage between the outer tubes, the inner passage forming the water inlet chamber, the annular passage forming the water outlet chamber, or the annular passage forming the water inlet chamber, the inner chamber A passage forms the outlet chamber.

The water heater according to claim 16, wherein an upper end of the inner tube is integrally formed on an inner wall of an upper end of the outer tube, or an upper end of the inner tube is screwed to an inner wall of an upper end of the outer tube.

The water heater according to claim 15, wherein the second port is composed of a pipe body and a partition plate penetrating the pipe body, and the inner passage of the pipe body passes through the partition The plate is divided into two chambers, one of which forms the water inlet chamber and the other chamber forms the water outlet chamber.

The water heater according to claim 15, wherein the on/off control device has one or more through holes, and the third port passes through the one or more through holes and the first The ports are connected.

1〜2皿。 The water heater of the present invention, wherein the diameter of the through hole is 0. 1~2.