Heater and water dispenser

Abstract

The utility model relates to the technical field of water dispensers, and provides a heater and a water dispenser. The heater comprises a heating pipe and an enhanced heat exchange assembly; the enhanced heat exchange assembly is provided with a jet flow cavity and a water inlet communicated with the jet flow cavity, the water inlet faces the liquid inlet end opening, a water passing gap is formed between the outer wall face of the jet flow cavity and the inner wall face of the heating pipe, a plurality of jet flow holes are formed in the side wall of the jet flow cavity, and the hole diameter of the jet flow holes ranges from 0.5 mm to 3 mm. According to the heater provided by the utility model, incoming water enters the heating pipe through the water inlet port of the heating pipe, then enters the jet flow cavity from the water inlet of the jet flow cavity, forms jet flow through the jet flow holes formed in the side wall of the jet flow cavity, vertically flows out and enters the water passing gap, and washes the heating wall surface of the heating pipe, so that the heat exchange efficiency of the water and the heating wall surface can be improved; and the aperture of the jet flow hole is set to be 0.5 mm to 3 mm, so that the liquid flow pressure drop can be in a better range on the premise of ensuring the heat exchange efficiency, and the stability of the heater is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water dispensers, in particular to a heater and a water dispenser. Background Art

[0002] An instant hot water dispenser is a special type of water dispenser that can quickly heat water when needed and provide hot water for people to use.

[0003] Affected by the instability of the two-phase flow in the high-temperature section of the flow heating process, when the outlet temperature of the instant hot water dispenser is higher than 95 degrees Celsius, the outlet jet phenomenon is prone to occur, resulting in a sharp decrease in the reliability of the instant hot water system. Due to the high-temperature jet phenomenon, existing instant hot water dispensers generally use a heating method with a target temperature increase at the initial stage of heating. However, the heat exchange efficiency of the heater of the existing instant hot water dispenser is low, resulting in the temperature of the first cup of water being too low. Utility Model Content

[0004] The utility model provides a heater and a water dispenser, which are used to solve the defect of low heat exchange efficiency of the heater in the existing instant hot water dispenser, can improve the heat exchange efficiency, and make the liquid flow pressure drop within a better range, thereby improving the stability of the heater.

[0005] The utility model provides a heater, comprising a heating tube and an enhanced heat exchange component. The heating tube has a liquid inlet port and a liquid outlet port; the enhanced heat exchange component has a jet cavity and a water inlet connected to the jet cavity, the water inlet faces the liquid inlet port, a water gap is provided between the outer wall surface of the jet cavity and the inner wall surface of the heating tube, and a plurality of jet holes are provided on the side wall of the jet cavity, and the aperture of the jet hole is 0.5 mm to 3 mm.

[0006] According to the heater provided by the utility model, the hole axis of the jet hole is perpendicular to the axial direction of the heating tube; or, the hole axis of the jet hole is inclined relative to the axial direction of the heating tube, so that the ejected fluid is directed toward the rear of the heating tube.

[0007] According to the heater provided by the utility model, the jet hole is circular, triangular or square.

[0008] According to the heater provided by the utility model, at least some of the jet holes have different apertures.

[0009] According to the heater provided by the utility model, the aperture of the jet hole located in the middle of the jet cavity is larger than the aperture of the jet holes located at both ends of the jet cavity.

[0010] According to the heater provided by the utility model, the enhanced heat exchange component includes a plurality of the jet cavities, the plurality of the jet cavities are arranged at intervals along the axial direction of the heating tube, the plurality of the jet holes on the same jet cavity have the same aperture; and the apertures of the jet holes on at least some of the jet cavities are different.

[0011] According to the heater provided by the utility model, along the flow direction of the fluid, the apertures of the jet holes on the plurality of jet cavities gradually increase or decrease.

[0012] According to the heater provided by the utility model, the plurality of jet holes are evenly distributed on the side wall of the jet cavity.

[0013] According to the heater provided by the utility model, the side wall of the jet cavity is provided with a plurality of jet hole groups spaced apart along the axial direction, and each of the jet hole groups includes a plurality of the jet holes uniformly distributed along the circumferential direction on the side wall of the jet cavity.

[0014] According to the heater provided by the utility model, the enhanced heat exchange component includes a center column, a jet tube and a water baffle, the water baffle is fixedly sleeved on the center column, one end of the jet tube faces the liquid inlet port to form the water inlet, the other end of the jet tube is connected to the water baffle, the jet hole is located on the wall of the jet tube, and the jet cavity is formed between the inner wall of the jet tube and the outer wall of the center column.

[0015] The heater provided by the utility model further comprises a water inlet structure and a water outlet structure, wherein the water inlet structure is connected to the liquid inlet port, and the water outlet structure is connected to the liquid outlet port.

[0016] Another aspect of the utility model provides a water dispenser, comprising a shell and the heater as described above, wherein the heater is arranged on the shell.

[0017] The heater provided by the utility model arranges an enhanced heat exchange component in the heating tube. After the incoming water enters the heating tube through the water inlet port of the heating tube, it enters the jet cavity from the water inlet of the jet cavity, and then forms a jet through the jet holes arranged on the side wall of the jet cavity to vertically flow out into the water passing gap, flushing the heating wall surface of the heating tube, which can improve the heat exchange efficiency between the water and the heating wall surface. Setting the aperture of the jet hole at 0.5mm to 3mm can improve the heat exchange efficiency and make the liquid flow pressure drop within a better range, thereby improving the stability of the heater.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of a heater provided in an embodiment of the utility model.

[0021] Figure 2 It is a cross-sectional view of the heater provided in the embodiment of the utility model.

[0022] Figure 3 It is a schematic diagram of the enhanced heat exchange component in the heater provided in an embodiment of the utility model.

[0023] Reference numerals:

[0024] 10. Heater; 110. Heating tube; 120. Enhanced heat exchange component; 121. Center column; 122. Jet tube; 1221. Jet cavity; 1222. Jet hole; 123. Water baffle; 130. Water inlet structure; 140. Water outlet structure; 150. Positioning structure; 160. Sealing structure; 170. Water inlet temperature sensor; 180. Water outlet temperature sensor. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0028] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0030] Combine the following Figures 1 to 3 The utility model describes a heater and a water dispenser.

[0031] It should be noted that in each embodiment of the heater 10 provided by the present invention, each numerical range includes both end point values. For example, the following “the diameter of the jet hole 1222 is 0.5 mm to 3 mm” includes two embodiments in which the diameter of the jet hole 1222 is 0.5 mm and 3 mm.

[0032] See also Figures 1 to 3As shown, the heater 10 provided by the embodiment of the utility model includes a heating tube 110 and an enhanced heat exchange component 120. The heating tube 110 has a liquid inlet port and a liquid outlet port; the enhanced heat exchange component 120 has a jet cavity 1221 and a water inlet connected to the jet cavity 1221, the water inlet faces the liquid inlet port, and there is a water gap between the outer wall surface of the jet cavity 1221 and the inner wall surface of the heating tube 110, and the side wall of the jet cavity 1221 is provided with a plurality of jet holes 1222, and the aperture of the jet hole 1222 is 0.5mm to 3mm.

[0033] The heater 10 provided by the utility model is provided with an enhanced heat exchange component 120 in the heating tube 110. After the incoming water enters the heating tube 110 through the water inlet port of the heating tube 110, it enters the jet cavity 1221 from the water inlet of the jet cavity 1221, and then forms a jet through the jet hole 1222 provided on the side wall of the jet cavity 1221 to vertically flow out into the water passing gap, flushing the heating wall surface of the heating tube 110, which can improve the heat exchange efficiency between the water and the heating wall surface. Setting the aperture of the jet hole 1222 at 0.5 mm to 3 mm can improve the heat exchange efficiency and make the liquid flow pressure drop within a better range, thereby improving the stability of the heater 10.

[0034] It should be noted that when the incoming water pressure remains unchanged, the smaller the aperture of the jet hole 1222, the higher the heat exchange efficiency between the jet formed by it and the heating wall surface, and the greater the pressure drop, and the larger the aperture of the jet hole 1222, the lower the heat exchange efficiency between the jet formed by it and the heating wall surface, and the smaller the pressure drop. When the pressure drop is larger, the stability of the heater 10 is poor, and when the pressure drop is smaller, the stability of the heater 10 is better.

[0035] As an example, the jet hole 1222 is a circular jet hole, and the aperture of the jet hole 1222 can be 0.5mm, 0.7mm, 1mm, 1.2mm, 1.6mm, 2.0mm or 2.4mm. The experimental results show that, under the premise that other conditions remain the same, when the aperture of the jet hole 1222 is 1.6mm, the heat transfer coefficient of the heater 10 is 3818W / m2K, the Nusselt number is 133, and the pressure drop is 103Pa; when the aperture of the jet hole 1222 is 2mm, the heat transfer coefficient of the heater 10 is 3361.6W / m2K, the Nusselt number is 117.4, and the pressure drop is 89.6Pa; when the aperture of the jet hole 1222 is 2.4mm, the heat transfer coefficient of the heater 10 is 2995W / m2K, the Nusselt number is 104, and the pressure drop is 84Pa. It can be seen that when the aperture of the jet hole 1222 is controlled to be between 0.5 mm and 3 mm, the heat transfer coefficient, Nusselt number and pressure drop of the heater 10 can be within a preferred range, thereby ensuring the heat transfer efficiency of the heater 10 and the stability during operation.

[0036] Specifically, see Figure 1and Figure 2 As shown, in this embodiment, the heating tube 110 is a cylindrical component with openings at both ends (water inlet port and water outlet port, respectively), a heating chamber is formed inside the heating tube 110, and the enhanced heat exchange component 120 is correspondingly arranged in the heating chamber, and a heating component is arranged inside the heating chamber. For example, the heating component can be an electric heating component such as thick film heating, quartz tube heating, nano film heating, cast aluminum heating, stainless steel wire heating, etc., or it can be a heat exchanger that realizes heating functions such as steam heating and combustion heating. The vertical jet formed by the jet hole 1222 is subjected to enhanced heat exchange with the heating wall surface (heating film or heating wire, etc.) of the heating tube 110, thereby improving the heat exchange efficiency of the heater 10.

[0037] Both ends of the heating chamber are provided with installation spaces for arranging components such as the water inlet structure 130 and the water outlet structure 140.

[0038] The multiple jet holes 1222 on the side wall of the jet chamber 1221 can be jet holes 1222 of the same aperture, which can produce jets of uniform coarseness and fineness, or at least some of the jet holes 1222 can have different apertures and can produce jets of corresponding coarseness and fineness at different axial or circumferential positions according to actual needs, so that the pressure drop and heat exchange efficiency at different axial positions of the jet chamber 1221 are maintained within an optimal range.

[0039] For example, the aperture of the jet hole 1222 located in the middle of the jet chamber 1221 is larger than the aperture of the jet holes 1222 located at the two ends of the jet chamber 1221. After the liquid flow enters the jet chamber 1221, it can form a coarser jet in the middle of the jet chamber 1221 through the jet hole 1222, and form a thinner jet at the two ends of the jet chamber 1221, so that the middle of the jet chamber 1221 maintains a smaller pressure drop, and the two ends with strong jets maintain a higher heat exchange efficiency, thereby balancing the pressure drop of the jet chamber 1221 and the heat exchange efficiency between the heated wall.

[0040] According to some embodiments of the utility model, along the flow direction of the fluid, the apertures of the jet holes 1222 on the multiple jet cavities 1221 gradually increase or decrease. When the apertures of the jet holes 1222 on the multiple jet cavities 1221 gradually increase, the jet formed by the jet holes 1222 located upstream can have a higher heat exchange efficiency with the heated wall surface, and the jet formed by the jet holes 1222 located downstream can have a smaller pressure drop, thereby balancing the pressure drop of the jet cavity 1221 and the heat exchange efficiency with the heated wall surface. Similarly, when the apertures of the jet holes 1222 on the multiple jet cavities 1221 gradually decrease, the jet formed by the jet holes 1222 located upstream can have a smaller pressure drop, and the jet formed by the jet holes 1222 located downstream can have a higher heat exchange efficiency with the heated wall surface, thereby balancing the pressure drop of the jet cavity 1221 and the heat exchange efficiency with the heated wall surface.

[0041] See also Figure 3 As shown, according to some embodiments of the present invention, a plurality of jet holes 1222 are evenly arranged on the side wall of the jet tube 122. By evenly distributing a plurality of jet holes 1222 on the side wall of the jet tube 122, it is possible to ensure that the jet formed by the jet holes 1222 is evenly distributed in the heating tube 110, and heat exchange occurs with different positions of the heating wall surface arranged along the circumferential direction, thereby improving the heat exchange efficiency. In addition, the jet formed by the jet holes 1222 is evenly distributed in the heating tube 110, which can also balance the force of the liquid flow in all directions impacting the heating wall surface, further improving the stability of the heater 10 when in use.

[0042] See also Figure 3 As shown, according to some embodiments of the present invention, the side wall of the jet tube 122 is provided with a plurality of jet hole groups at intervals along the axial direction, and each jet hole group includes a plurality of jet holes 1222 uniformly distributed along the circumferential direction on the side wall of the jet tube 122. By uniformly distributing the plurality of jet holes 1222 on the side wall of the jet tube 122 in the above manner, the liquid flow entering the same jet tube 122 can form jets through the plurality of jet holes 1222 arranged at intervals along the circumferential direction, and contact the heating wall surfaces at different axial positions, so that different positions of the heating wall surface can be fully utilized to perform heat exchange with different jets, thereby further improving the heat exchange efficiency.

[0043] See also Figure 3 As shown, according to some embodiments of the utility model, the enhanced heat exchange component 120 includes a central column 121, a jet tube 122 and a water baffle 123, the water baffle 123 is fixedly sleeved on the central column 121, one end of the jet tube 122 faces the liquid inlet port to form a water inlet, the other end of the jet tube 122 is connected to the water baffle 123, the jet hole 1222 is located on the cylinder wall of the jet tube 122, and a jet cavity 1221 is formed between the inner wall of the jet tube 122 and the outer wall of the central column 121. Both ends of the central column 121 are fixed in the heating tube 110 through the positioning structure 150, and are coaxially arranged with the heating tube 110. The central column 121 is a cylindrical component with a certain length, the jet tube 122 is installed on the central column 121 through the water baffle 123, and the central column 121 is penetrated through the jet cavity 1221 of the jet tube 122. The jet tube 122 is a cylindrical component. After water enters the jet chamber 1221 through the water inlet, the water flows out from the jet hole 1222 located on the side wall under the action of the water baffle 123 and forms a jet.

[0044] It should be noted that the number of the ejector tubes 122 is at least one, and can be single or multiple, which is selected according to the specifications of the heater 10. When the enhanced heat exchange component 120 has a single ejector tube 122, the incoming water can form a single jet through the ejection hole 1222 after entering the ejector tube 122. When there are multiple ejector tubes 122, the multiple ejector tubes 122 are arranged on the central column 121 at intervals along the water flow direction, and the incoming water flows through the ejection holes 1222 of the multiple ejector tubes 122 in sequence to form multiple jets. Through multiple jet heat exchanges, the fluid temperature continues to rise until it reaches the design temperature, and then flows out from the outlet structure.

[0045] See also Figure 3 As shown, as a preference, the enhanced heat exchange component 120 of this embodiment includes a plurality of jet chambers 1221, and the plurality of jet chambers 1221 are arranged at intervals along the axial direction of the heating tube 110, and the plurality of jet holes 1222 on the same jet chamber 1221 have the same aperture. By providing a plurality of jet chambers 1221, it is possible to increase the step-by-step heating of the liquid flow by the multiple jets formed by the plurality of jet chambers 1221, and to increase the outlet water temperature of the heater 10. Moreover, by setting the plurality of jet holes 1222 on the same jet chamber 1221 to have the same aperture, the jets generated at each part of the jet chamber 1221 can have the same heat exchange efficiency and pressure drop, and facilitate the processing and manufacturing of the jet chamber 1221.

[0046] According to some embodiments of the present invention, when the enhanced heat exchange component 120 has a plurality of jet tubes 122, the apertures of the jet holes 1222 on at least some of the jet chambers 1221 are different, so that the jet tubes 122 located at different axial positions can have corresponding pressure drops and heat exchange efficiencies. For example, the enhanced heat exchange component 120 has four jet tubes 122 spaced apart along the circumferential direction, the jet holes 1222 on the two jet tubes 122 located upstream have larger apertures, and the jet holes 1222 on the two jet tubes 122 located downstream have smaller apertures, so that there is a smaller pressure drop upstream of the heating tube 110 and a higher heat exchange efficiency downstream of the heating tube 110.

[0047] According to some embodiments of the present invention, the hole axis of the jet hole 1222 is perpendicular to the axial direction of the heating tube 110. By setting the hole axis of the jet hole 1222 to be perpendicular to the axial direction of the heating tube 110, a jet perpendicular to the heating wall surface can be generated through the jet hole 1222, thereby improving the heat exchange efficiency between the liquid flow and the heating wall surface.

[0048] According to some embodiments of the present invention, the hole axis of the jet hole 1222 is inclined relative to the axial direction of the heating tube 110, so that the injected fluid is directed toward the rear of the heating tube 110. By setting the hole axis of the jet hole 1222 to be inclined relative to the axial direction of the heating tube 110, a jet directed toward the rear of the heating tube 110 can be generated through the jet hole 1222, extending the time the jet is located in the water gap, increasing the heat exchange time between the liquid flow and the heating wall surface, and thus increasing the outlet water temperature of the heater 10.

[0049] It should be noted that the rear of the heating pipe 110 specifically refers to the direction where the water inlet port of the heating pipe 110 is located.

[0050] According to some embodiments of the utility model, the jet hole 1222 is circular, triangular or square. By setting the jet hole 1222 as a circular jet hole, a triangular jet hole or a square jet hole, a circular, triangular or square jet with a corresponding cross-sectional shape can be formed to adapt to different pressure drop and heat exchange efficiency requirements. For example, when the jet hole 1222 is a circular jet hole, it is suitable for general situations, when the jet hole 1222 is a square jet hole, it is suitable for situations where the pressure drop requirement is greater than the heat exchange capacity requirement, and when the jet hole 1222 is a triangular jet hole, it is suitable for situations where the heat exchange capacity requirement is greater than the pressure drop requirement.

[0051] It should be noted that, when the jet hole 1222 is a circular jet hole, the above-mentioned "the aperture of the jet hole 1222 is 0.5mm to 3mm" specifically refers to the inner diameter of the circular jet hole being 0.5mm to 3mm; when the jet hole 1222 is a triangular jet hole, the above-mentioned "the aperture of the jet hole 1222 is 0.5mm to 3mm" specifically refers to the distance between the center of the triangular jet hole and the triangular vertices being 0.5mm to 3mm; when the jet hole 1222 is a square jet hole, the above-mentioned "the aperture of the jet hole 1222 is 0.5mm to 3mm" specifically refers to the distance between the center of the square jet hole and the four corner vertices being 0.5mm to 3mm.

[0052] See also Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the heater 10 further includes a water inlet structure 130 and a water outlet structure 140, the water inlet structure 130 is connected to the water inlet end of the heating tube 110, and the water outlet structure 140 is connected to the water outlet end of the heating tube 110. By respectively arranging the water inlet structure 130 and the water outlet structure 140 at the water inlet end and the water outlet end of the heating tube 110, it is convenient to connect with the upstream component of the heater 10 in the water dispenser through the water inlet structure 130, and to connect with the downstream component of the heater 10 in the water dispenser through the water outlet structure 140.

[0053] Specifically, in this embodiment, the water inlet structure 130 is provided at the water inlet end of the heating tube 110 through a threaded connection, and the water outlet structure 140 is provided at the water outlet end of the heating tube 110 through a threaded connection, which is convenient for disassembly and assembly, and convenient for taking out the enhanced heat exchange component 120 provided in the heating tube 110 for cleaning, maintenance or replacement. A sealing structure 160 (such as a sealing ring) is provided at the connection position between the water inlet structure 130, the water outlet structure 140 and the heating tube 110 to enhance the sealing performance of the heater 10.

[0054] See also Figure 1 As shown, according to some embodiments of the present invention, the water inlet structure 130 is provided with a water inlet temperature sensor 170 for monitoring the water inlet temperature, and the water outlet structure 140 is provided with a water outlet temperature sensor 180 for monitoring the water outlet temperature. By providing the water inlet temperature sensor 170 and the water outlet temperature sensor 180, the inlet and outlet water temperatures of the heating pipe 110 can be monitored in real time, and the heating effect of the heating pipe 110 can also be reflected by the inlet and outlet water temperatures of the heating pipe 110.

[0055] The water dispenser provided in the embodiment of the utility model comprises a housing and the above-mentioned heater 10, and the heater 10 is arranged in the housing.

[0056] The water dispenser provided by the utility model can improve the heat exchange efficiency between water and the heating wall surface due to the use of the above-mentioned heater 10, and can make the liquid flow pressure drop within a better range while ensuring the heat exchange efficiency, thereby improving the stability of the heater 10.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A heater, characterized in that: include: A heating tube, wherein the heating tube has a liquid inlet port and a liquid outlet port; An enhanced heat exchange component, the enhanced heat exchange component has a jet cavity and a water inlet connected to the jet cavity, the water inlet faces the liquid inlet port, a water gap is provided between the outer wall surface of the jet cavity and the inner wall surface of the heating tube, the side wall of the jet cavity is provided with a plurality of jet holes, and the aperture of the jet holes is 0.5 mm to 3 mm.

2. The heater according to claim 1, characterized in that The hole axis of the jet hole is perpendicular to the axial direction of the heating tube; Alternatively, the hole axis of the jet hole is inclined relative to the axial direction of the heating tube, so that the jetted fluid is directed toward the rear of the heating tube.

3. The heater according to claim 1, characterized in that The jet hole is circular, triangular or square.

4. The heater according to claim 1, characterized in that At least some of the jet holes have different apertures.

5. The heater according to claim 4, characterized in that The aperture of the jet hole located in the middle of the jet cavity is larger than the aperture of the jet holes located at both ends of the jet cavity.

6. The heater according to claim 1, characterized in that The enhanced heat exchange component includes a plurality of the jet cavities, which are arranged at intervals along the axial direction of the heating tube, and the plurality of the jet holes on the same jet cavity have the same aperture; the apertures of the jet holes on at least some of the jet cavities are different.

7. The heater according to claim 6, characterized in that Along the flow direction of the fluid, the apertures of the jet holes on the plurality of jet chambers gradually increase or decrease.

8. The heater according to claim 1, characterized in that The plurality of jet holes are evenly distributed on the side wall of the jet cavity.

9. The heater according to claim 8, characterized in that The side wall of the jet cavity is provided with a plurality of jet hole groups at intervals along the axial direction, and each of the jet hole groups includes a plurality of jet holes uniformly distributed on the side wall of the jet cavity along the circumferential direction.

10. The heater according to any one of claims 1 to 9, characterized in that: The enhanced heat exchange component includes a center column, a jet tube and a water baffle, the water baffle is fixedly sleeved on the center column, one end of the jet tube faces the liquid inlet port to form the water inlet, the other end of the jet tube is connected to the water baffle, the jet hole is located on the wall of the jet tube, and the jet cavity is formed between the inner wall of the jet tube and the outer wall of the center column.

11. The heater according to any one of claims 1 to 9, characterized in that: It also includes a water inlet structure and a water outlet structure, wherein the water inlet structure is connected to the liquid inlet port, and the water outlet structure is connected to the liquid outlet port.

12. A water dispenser, characterized in that: include: case; The heater according to any one of claims 1 to 11, wherein the heater is disposed on the housing.

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