CN113154668A

CN113154668A - Constant temperature water heater

Info

Publication number: CN113154668A
Application number: CN202110308484.6A
Authority: CN
Inventors: 侯全舵; 曾艳; 张若晨
Original assignee: Xiamen Aquasu Electric Shower Co ltd
Current assignee: Xiamen Aquasu Electric Shower Co ltd
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-07-23
Anticipated expiration: 2041-03-23
Also published as: CN113154668B

Abstract

The invention provides a constant-temperature water heater, and relates to the technical field of water heaters. Wherein, this kind of constant temperature water heater includes water tank mechanism and water tank mechanism. The water tank mechanism is internally provided with a water storage cavity for storing water. The water inlet and outlet assembly comprises a first main body, a second main body and a constant temperature mechanism. The first main part is provided with water inlet, first passageway and second passageway, and first passageway and second passageway communicate respectively in the water inlet. The second main body is provided with a water outlet, an installation cavity, a third channel and a fourth channel which are respectively communicated with the water storage cavity. The constant temperature mechanism is configured in the installation cavity, the third channel is communicated with the first channel, and the fourth channel and the second channel are respectively communicated with the constant temperature mechanism. Cold water can flow into the water storage cavity from the water inlet through the first channel and the third channel. The cold water and the hot water can respectively flow into the constant temperature mechanism from the second channel and the fourth channel to form mixed water, and the mixed water can be discharged from the water outlet.

Description

Constant temperature water heater

Technical Field

The invention relates to the technical field of water heaters, in particular to a constant-temperature water heater.

Background

The water heater is a common living electric appliance, and with the development of industry and the improvement of people's life, new requirements are put forward to the water heater, such as: the water required to come out of the water heater is the required warm water.

In the prior art, a thermostat device is generally added outside a water inlet pipe and a water outlet pipe of a traditional water heater. Although the constant temperature water heater can provide required warm water, the constant temperature device is independent, so that the appearance of the water heater is influenced, the layout of water pipelines is messy, and the probability of water leakage and the like is increased due to the increase of the connecting ports. In view of the above, the inventors of the present invention have made a study of the prior art and then have made the present application.

Disclosure of Invention

The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a constant temperature water heater, comprising:

the water tank mechanism is internally provided with a water storage cavity;

the water inlet and outlet assembly is configured on the water tank mechanism and comprises a first main body, a second main body and a constant temperature mechanism; the first main body is provided with a water inlet, a first channel and a second channel, and the first channel and the second channel are respectively communicated with the water inlet; the second main body is provided with a water outlet, an installation cavity, a third channel and a fourth channel which are respectively communicated with the water storage cavity, the constant temperature mechanism is configured in the installation cavity, the third channel is communicated with the first channel, and the fourth channel and the second channel are respectively communicated with the constant temperature mechanism;

cold water can flow into the water storage cavity from the water inlet through the first channel and the third channel; cold water and hot water can flow into the constant temperature mechanism from the second channel and the fourth channel respectively to form mixed water, and the mixed water can be discharged from the water outlet.

As a further optimization, the first main body is provided with a first water inlet hole and a second water inlet hole, the first water inlet hole is communicated with the third channel, and the second water inlet hole is communicated with the constant temperature mechanism; the second main body is provided with a first extension section and a second extension section which extend outwards, the first extension section is provided with the first channel, and the second extension section is provided with the second channel; the second main body is configured on the first main body and can drive the first extension section and the second extension section to be respectively inserted into the first water inlet hole and the second water inlet hole.

As a further optimization, the first main body is also provided with a water passing groove; the second main body is also provided with a third extending section extending outwards, and the third extending section is provided with a first water passing channel and a second water passing channel which are mutually independent; the second main body is arranged on the first main body and can drive the third extension section to be inserted into the water passing groove; cold water can flow into the water storage cavity from the water inlet through the first water passing channel, the water passing groove, the second water passing channel and the third channel in sequence.

As a further optimization, the first body and the second body are of split structures.

As a further optimization, the third channel and the fourth channel are independent from each other, and the fourth channel is internally arranged in the third channel.

As a further optimization, the position where the third channel is communicated with the water storage cavity is lower than the position where the fourth channel is communicated with the water storage cavity.

As a further optimization, the constant temperature mechanism is provided with a cold water inlet and a hot water inlet, and comprises a first spring, a second spring, a temperature sensing rod, a movable part and an adjusting part, wherein the temperature sensing rod is supported between the first spring and the second spring; the temperature sensing rod can drive the movable piece to move up and down according to the change of water temperature so as to change the sizes of the openings of the cold water inlet and the hot water inlet; the adjusting piece can adjust the temperature sensing rod and drive the moving piece to move up and down so as to change the sizes of the openings of the cold water inlet and the hot water inlet.

As a further refinement, the thermostatic mechanism further comprises a motor for adjusting the adjusting member.

As further optimization, the water inlet and outlet assembly further comprises a first temperature sensor and a second temperature sensor, the first temperature sensor is used for detecting the temperature of cold water from the water inlet, and the second temperature sensor is used for detecting the temperature of mixed water discharged from the water outlet.

As a further optimization, the water tank mechanism is provided with an exposed joint, and the joint limits a first connecting part in a sheet shape; the second body defines a second connecting portion in the shape of a sheet; the constant temperature water heater also comprises a U-shaped buckle, and the buckle is provided with a bayonet part penetrating through one pair of extension arms; the buckle can enable the first connecting part and the second connecting part to be buckled together in a butt joint mode, and the first connecting part and the second connecting part are limited at the bayonet part at the same time.

By adopting the technical scheme, the invention can obtain the following technical effects:

1. the constant temperature water heater has the advantages that the water inlet and outlet assembly is perfectly integrated with the constant temperature mechanism, so that the water heater is more attractive, and the arrangement of water pipelines is not messy due to the addition of the constant temperature mechanism. In addition, because the constant temperature mechanism is directly installed on the water inlet and outlet assembly, the excessive interfaces caused by the configuration of the constant temperature mechanism can be greatly reduced, and the risk of water leakage is reduced.

2. The invention relates to a constant temperature water heater, wherein a water path input to a water storage cavity comprises: the water inlet, the first water channel, the water passing groove, the second water channel, the first channel and the like, so that the water path input into the water storage cavity has enough length, and the constant temperature water heater has better electric leakage protection capability.

3. According to the constant temperature water heater, the first main body and the second main body of the water inlet and outlet assembly are of split structures, so that the processing difficulty of the first main body and the second main body can be greatly reduced.

4. The constant temperature water heater has the advantages that the water tank mechanism and the water inlet and outlet assembly are connected through the arrangement of the first connecting part and the second connecting part and the buckle, and the connecting mode has the characteristics of simple structure and reliable connection.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a first axial side structure of a constant temperature water heater according to an embodiment of the present invention;

FIG. 2 is a schematic view of a partial cross-sectional structure of a constant temperature water heater according to an embodiment of the present invention;

FIG. 3 is a partially exploded schematic view of a constant temperature water heater according to an embodiment of the present invention;

FIG. 4 is a schematic view of a first axial side structure of a water inlet and outlet assembly according to an embodiment of the present invention;

FIG. 5 is a first partially exploded view of the water inlet and outlet assembly, in accordance with an embodiment of the present invention;

FIG. 6 is a second partially exploded schematic view of a water inlet and outlet assembly in accordance with an embodiment of the present invention;

FIG. 7 is a schematic axial side view of a first body according to an embodiment of the present invention;

FIG. 8 is a schematic view of a first cross-sectional configuration of a water inlet and outlet assembly, in accordance with an embodiment of the present invention;

FIG. 9 is a schematic diagram of a second cross-sectional configuration of a water inlet and outlet assembly, in accordance with an embodiment of the present invention;

FIG. 10 is a schematic view of a third cross-sectional configuration of a water inlet and outlet assembly in accordance with an embodiment of the present invention;

the labels in the figure are:

100-a water tank mechanism; 110-a water storage cavity; 120-a linker; 121-a first connection;

200-a water inlet and outlet assembly;

210-a first body; 211-a water inlet; 212-a first extension; 213-a second extension; 214-a third extension; 215-a first water passage; 216-a second water passage; 217-a first channel; 218-a second channel;

220-a second body; 221-a water outlet; 222-a first water inlet hole; 223-a second water inlet hole; 224-passing through a water tank; 225-third channel; 226-fourth channel; 227-a second connecting portion;

230-a constant temperature mechanism; 231-a first spring; 232-temperature sensing rod; 233-a movable member; 234-a second spring; 235-an adjustment member; 236-cold water inlet; 237-hot water inlet;

240-a first temperature sensor; 250-a second temperature sensor;

300-buckling; 310-bayonet portion.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The invention is described in further detail below with reference to the following detailed description and accompanying drawings:

as shown in fig. 1, 2 and 3, the present embodiment provides a constant temperature water heater including a tank mechanism 100, an inlet and outlet assembly 200, and a clip 300, wherein the clip 300 is used to connect the inlet and outlet assembly 200 to the tank mechanism 100. The water tank mechanism 100 is provided with a water storage cavity 110 for storing water therein, and the water tank mechanism 100 includes a heating device for heating the water in the water storage cavity 110, which belongs to the prior art and is not described herein again. The water inlet and outlet assembly 200 is used to input cold water from the municipality into the water storage chamber 110 and also to output hot water from the water storage chamber 110. In addition, the water inlet and outlet assembly 200 has the function of mixing cold water from municipal administration and hot water from the water storage cavity 110 to ensure constant outlet water. The method comprises the following specific steps:

as shown in fig. 1 to 4, in the present embodiment, the tank mechanism 100 is provided with an exposed joint 120, the joint 120 can be connected to the water storage chamber 110, and the end of the joint 120 is limited to form a first connecting portion 121 having a flat shape. The water inlet and outlet assembly 200 also defines a second connection portion 227 that is flat. During specific installation, the pipes of the water inlet and outlet assembly 200 are first passed through the joint 120, then the first connecting portion 121 and the second connecting portion 227 are butted, and finally the first connecting portion 121 and the second connecting portion 227 are connected together by the fastener 300. As shown in fig. 3 and 4, the buckle 300 is a U-shaped geometric body, the buckle 300 is provided with a bayonet portion 310, and the bayonet portion 310 is a through hole penetrating through a pair of extension arms of the buckle 300. In a specific operation, after the first connection portion 121 and the second connection portion 227 are butted, the buckle 300 is transversely buckled into the first connection portion 121 and the second connection portion 227, so that the first connection portion 121 and the second connection portion 227 are buckled to the bayonet portion 310. Note that the height of the bayonet portion 310 is slightly higher than the overlapping height of the first connection portion 121 and the second connection portion 227. In addition, the opening end of the buckle 300 is provided with an angle which is opened towards two sides, and the structure can ensure that the buckle 300 is smoothly buckled with the first connecting part 121 and the second connecting part 227. In the above solution, the first connection portion 121, the second connection portion 227 and the buckle 300 are engaged, so that the structure is simple and the reliability is high.

As shown in fig. 4 to 7, in the present embodiment, the water inlet and outlet assembly 200 includes a first body 210, a second body 220, and a thermostatic mechanism 230. Wherein the first body 210 is provided with a water inlet 211, and a first extension 212, a second extension 213, and a third extension 214 extending outward. As shown in fig. 7, the first extension section 212 has a first passage 217, the second extension section 213 has a second passage 218, and the third extension section 214 has a first water passage 215 and a second water passage 216 that are independent and substantially parallel to each other. It should be noted that the second channel 218 and the first water passage 215 are directly communicated with the water inlet 211 respectively.

As shown in fig. 6, in the present embodiment, the second body 220 is provided with a first body 210 provided with a first water inlet hole 222, a second water inlet hole 223 and a water passing groove 224, and the water passing groove 224 is a blind hole. The shapes of the first water inlet hole 222, the second water inlet hole 223 and the water passing groove 224 are respectively matched with the first extension section 212, the second extension section 213 and the third extension section 214. When installed, the first body 210 is installed together in such a manner that the first, second and

third extension sections

212, 213 and 214 are inserted into the first, second and water inlet holes 222, 223 and the water passing groove 224, respectively. As shown in fig. 5, the cold water from the water inlet 211 is divided into two paths, and the first path is composed of the water inlet 211, a first water passing channel 215, a water passing groove 224, a second water passing channel 216, and a first channel 217. The second path is composed of the water inlet 211 and the second passage 218. In fig. 5 and 6, S1 and S2 are water path trajectory diagrams of the first path and the second path, respectively.

As shown in fig. 8 to 10, in the present embodiment, the second body 220 is further provided with a mounting cavity, and a third channel 225 and a fourth channel 226 respectively communicated with the water storage cavity 110. Wherein the thermostatic mechanism 230 is disposed in the installation cavity, and the thermostatic mechanism 230 is provided with a cold water inlet 236 and a hot water inlet 237. As shown in fig. 9, the third passage 225 is also communicated with the first inlet hole 222, so that the cold water from the first path (S1) can flow into the water storage chamber 110 through the third passage 225. As shown in fig. 10, the fourth passage 226 is communicated with the hot water inlet 237 of the thermostatic mechanism 230, so that the hot water from the water storage chamber 110 can flow into the thermostatic mechanism 230 through the fourth passage 226. Further, as shown in fig. 8, the second water inlet hole 223 communicates with the cold water inlet 236 of the thermostatic mechanism 230, so that the cold water from the second path (S2) can flow into the thermostatic mechanism 230 through the second passage 218. In addition, in this embodiment, the first main body 210 and the second main body 220 of the water outlet assembly are separate structures, so that the processing difficulty of the first main body 210 and the second main body 220 can be greatly reduced. Of course, in another embodiment, the first body 210 and the second body 220 may also be an integral structure, and are not described herein again.

As can be seen from the above description, the cold water from the water inlet 211 flows into the water storage chamber 110 and the thermostatic mechanism 230, respectively, and the hot water from the water storage chamber 110 flows into the thermostatic mechanism 230. The thermostatic mechanism 230 can mix the cold water from the water inlet 211 and the hot water from the water storage chamber 110 to form mixed water, and finally discharge the mixed water from the water outlet 221, and the temperature of the mixed water can be directly adjusted by the thermostatic mechanism 230.

It should be further noted that, with the above arrangement, the water path input into the water storage cavity 110 by the thermostatic water heater of the embodiment is formed by: the water inlet 211, the first water passing channel 215, the water passing groove 224, the second water passing channel 216, the first channel 217 and the like, so that the waterway input to the water storage cavity 110 has enough length, the ratio of the length to the diameter of the waterway is larger, and the constant temperature water heater has better electric leakage protection capability. Wherein, the proportion of the length of water route and diameter is bigger, can have the principle of better electric leakage protective capability, belongs to the prior art in this field, and no longer repeated here.

Further, as shown in fig. 10, in the present embodiment, the third channel 225 and the fourth channel 226 are concentrically arranged, and the fourth channel 226 is located inside the third channel 225. It should be noted that the position where the third channel 225 communicates with the water storage chamber 110 is lower than the position where the fourth channel 226 communicates with the water storage chamber 110. This ensures that the cold water entering from the third channel 225 does not affect the hot water flowing into the fourth channel 226, ensuring that the hot water flows into the fourth channel 226. In addition, in the embodiment, the position where the third channel 225 is communicated with the water storage cavity 110 is arranged on the side wall of the third channel 225, so that the water flow direction entering the water storage cavity 110 and the hot water flow direction entering the fourth channel 226 are ensured to be approximately vertical, and the mutual influence between the two can be further reduced.

As shown in fig. 8 and 10, in the present embodiment, the thermostatic mechanism 230 includes a first spring 231, a second spring 234, a temperature sensing rod 232, a movable member 233, and an adjustment member 235, and the temperature sensing rod 232 is supported between the first spring 231 and the second spring 234. The temperature sensing rod 232 can be extended to different degrees according to the temperature change of the mixed water formed therein, thereby driving the movable member 233 to move up and down. The up and down movement of the movable member 233 can adjust the opening sizes of the cold water inlet 236 and the hot water inlet 237, thereby adjusting the flow rates of the cold water and the hot water flowing into the thermostatic mechanism 230 respectively. Therefore, the thermostatic mechanism 230 can ensure that the temperature of the mixed water finally flowing out is within a stable range. When the outlet water temperature of the mixed water needs to be adjusted, the up-and-down position of the temperature sensing rod 232 can be adjusted through the adjusting piece 235, and then the outlet water temperature of the mixed water is adjusted. It should be noted that the operation principle of the thermostatic mechanism 230 belongs to the prior art in the field, and is not described herein.

In addition, in this embodiment, the constant temperature water heater further includes a control mechanism and a display mechanism. The thermostatic mechanism 230 includes a first temperature sensor 240 and a second temperature sensor 250, the first temperature sensor 240 is used for detecting the temperature of the cold water from the water inlet 211, and the second temperature sensor 250 is used for detecting the temperature of the mixed water discharged from the water outlet 221. The first temperature sensor 240 and the second temperature sensor 250 are electrically connected to the control mechanism, respectively, and the display mechanism can display the water temperatures of the water inlet 211 and the water outlet 221.

Of course, in another embodiment, the thermostatic mechanism 230 further includes a motor electrically connected to the control mechanism, and the control mechanism can drive the adjusting member 235 to rotate, so as to set the outlet water temperature.

Through the above scheme of the embodiment, the constant temperature water heater of the present application, the water inlet and outlet assembly 200 is perfectly integrated with the constant temperature mechanism 230, so that the water heater is more beautiful, and the layout of the water path pipeline is not messy due to the addition of the constant temperature mechanism 230. In addition, because the thermostatic mechanism 230 is directly installed on the water inlet/outlet assembly 200, the number of excessive interfaces due to the configuration of the thermostatic mechanism 230 can be greatly reduced, and the risk of water leakage is reduced.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A constant temperature water heater, comprising:

a water tank mechanism (100) in which a water storage chamber (110) is provided;

a water inlet/outlet assembly (200) which is disposed in the tank mechanism (100) and includes a first body (210), a second body (220), and a thermostatic mechanism (230); the first main body (210) is provided with a water inlet (211), a first channel (217) and a second channel (218), and the first channel (217) and the second channel (218) are respectively communicated with the water inlet (211); the second main body (220) is provided with a water outlet (221), an installation cavity, a third channel (225) and a fourth channel (226) which are respectively communicated with the water storage cavity (110), the constant temperature mechanism (230) is configured in the installation cavity, the third channel (225) is communicated with the first channel (217), and the fourth channel (226) and the second channel (218) are respectively communicated with the constant temperature mechanism (230);

cold water can flow from the water inlet (211) into the water storage cavity (110) through the first channel (217) and the third channel (225); from the second channel (218) and the fourth channel (226), cold water and hot water can respectively flow into the thermostatic mechanism (230) to form mixed water, and the mixed water can be discharged from the water outlet (221).

2. A thermostatic water heater according to claim 1, characterized in that said first body (210) is provided with a first inlet hole (222) and a second inlet hole (223), and said first inlet hole (222) is in communication with said third channel (225), said second inlet hole (223) being in communication with said thermostatic mechanism (230); the second body (220) is provided with a first extension section (212) and a second extension section (213) extending outwards, the first extension section (212) is provided with the first channel (217), and the second extension section (213) is provided with the second channel (218); the second main body (220) is configured on the first main body (210) and can drive the first extension section (212) and the second extension section (213) to be respectively inserted into the first water inlet hole (222) and the second water inlet hole (223).

3. A thermostatic water heater according to claim 2, characterized in that the first body (210) is further provided with a water passing tank (224); the second main body (220) is also provided with a third extending section (214) extending outwards, and the third extending section (214) is provided with a first water passing channel (215) and a second water passing channel (216) which are independent of each other; the second main body (220) is configured on the first main body (210) and can drive the third extending section (214) to be inserted into the water passing groove (224); cold water can flow into the water storage cavity (110) from the water inlet (211) through the first water passing channel (215), the water passing groove (224), the second water passing channel (216) and the third channel (225) in sequence.

4. A thermostatic water heater according to claim 2 or 3, characterized in that the first body (210) and the second body (220) are of split construction.

5. A thermostatic water heater according to claim 1, characterized in that said third channel (225) and said fourth channel (226) are independent from each other, and said fourth channel (226) is built-in to said third channel (225).

6. A thermostatic water heater according to claim 5, characterized in that said third channel (225) communicates with said water storage chamber (110) at a lower level than that at which said fourth channel (226) communicates with said water storage chamber (110).

7. A thermostatic water heater according to claim 1, characterized in that the thermostatic mechanism (230) is provided with a cold water inlet (236) and a hot water inlet (237), the thermostatic mechanism (230) comprising a first spring (231), a second spring (234), a temperature sensing rod (232), a movable member (233) and an adjustment member (235), the temperature sensing rod (232) being supported between the first spring (231) and the second spring (234); the temperature sensing rod (232) can drive the movable piece (233) to move up and down according to the change of the water temperature so as to change the sizes of the openings of the cold water inlet (236) and the hot water inlet (237); the adjusting piece (235) can adjust the temperature sensing rod (232) and drive the moving piece (233) to move up and down so as to change the sizes of the openings of the cold water inlet (236) and the hot water inlet (237).

8. A thermostatic water heater according to claim 7, characterized in that the thermostatic mechanism (230) further comprises a motor for adjusting the adjustment member (235).

9. A thermostatic water heater as claimed in claim 1 or 7 or 8 wherein the inlet and outlet assembly (200) further includes a first temperature sensor (240) and a second temperature sensor (250), the first temperature sensor (240) being arranged to sense the temperature of cold water from the inlet (211) and the second temperature sensor (250) being arranged to sense the temperature of mixed water exiting the outlet (221).

10. A thermostatic water heater according to claim 1, characterized in that the tank means (100) is provided with an exposed joint (120), and the joint (120) defines a first connection (121) in the form of a sheet; the second body (220) defines a second connecting portion (227) having a laminar shape; the constant temperature water heater also comprises a U-shaped buckle (300), and the buckle (300) is provided with a bayonet part (310) penetrating through a pair of extension arms of the buckle; the buckle (300) can enable the first connecting part (121) and the second connecting part (227) to be buckled together in a butt joint mode, and enables the first connecting part (121) and the second connecting part (227) to be limited at the clamping opening part (310) at the same time.