Water pump and water heater comprising same

Abstract

The application discloses a water pump and a water heater comprising the same. The water pump comprises a motor module and a first cavity, the motor module is arranged in the first cavity, and the water pump further comprises a second cavity, at least part of the second cavity surrounds the outer wall of the first cavity, and the second cavity is used for injecting liquid. The water pump and the water heater comprising the same surround the outer wall of the first cavity by at least part of the second cavity, and inject liquid in the second cavity, so that the liquid in the second cavity adheres to the outer wall of the first cavity, the viscous resistance of the liquid is used to absorb the vibration energy generated by the motor module and transmitted to the outer wall of the first cavity, and the noise generated by vibration is reduced. Meanwhile, the liquid is injected in the second cavity, the overall mass of the water pump is increased, the vibration amplitude of the water pump in operation is reduced, and the noise of the water pump in operation is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water heaters, in particular to a water pump and a water heater comprising the same. BACKGROUND

[0002] In existing water heaters, especially gas water heaters with cold water circulation function, the noise generated by the operation of components such as water pump, burner and fan during the process of external cold water flowing into the main channel and being heated or the process of cold water in the pipeline being heated will bring discomfort to users and greatly affect the user experience. Among them, the motor module in the water pump will generate vibration to the water pump cavity during the process of boosting water pressure, thereby generating noise. The combustion gas flow (mixed gas and oxygen) on the burner will generate noise, and the fan conveying oxygen and discharging flue gas after combustion will also generate noise.

[0003] Adopting electric heating to replace or partially replace gas heating can avoid or reduce the noise generated by the operation of the burner and the fan. However, the general electric heating equipment occupies an independent space in the water heater, causing difficulties in structural arrangement, and is prone to scale accumulation, which will greatly reduce the heating efficiency and hinder the normal use of the electric heating equipment. At the same time, the accumulated scale will affect the smooth flow of water and also affect the noise reduction effect of the water heater. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the defect of large noise of the existing water heater, and to provide a water pump and a water heater comprising the same.

[0005] The present application solves the above technical problems by the following technical solutions:

[0006] A water pump, comprising a motor module and a first cavity, the motor module is arranged in the first cavity,

[0007] The water pump further comprises a second cavity, at least part of the second cavity surrounds the outer wall of the first cavity, and the second cavity is used for injecting liquid.

[0008] In this scheme, at least part of the second cavity surrounds the outer wall of the first cavity, and liquid is injected into the second cavity, so that the liquid in the second cavity adheres to the outer wall of the first cavity. The viscous resistance of the liquid does negative work to absorb the vibration energy generated by the motor module and transmitted to the outer wall of the first cavity, thereby reducing the noise generated by vibration. At the same time, the injection of liquid into the second cavity increases the overall mass of the water pump, thereby reducing the vibration amplitude of the water pump during operation and reducing the noise of the water pump during operation.

[0009] Preferably, the first cavity and the second cavity are in communication, and part of the second cavity surrounds the outer wall of the first cavity.

[0010] In the scheme, the liquid treated by the motor module in the first cavity is directly injected into the second cavity to absorb vibration energy, without the need to separately inject liquid into the second cavity through other structures or pipelines, thus simplifying the overall structure of the water pump and avoiding the possibility of noise generated by other structures for realizing separate liquid injection.

[0011] Preferably, the first cavity is in communication with the second cavity, and the second cavity comprises an inlet in communication with the first cavity, and the inlet and an outlet of the second cavity are respectively arranged at two ends of the second cavity along an axial direction of the second cavity.

[0012] In the scheme, the liquid treated by the motor module in the first cavity is directly injected into the second cavity to absorb vibration energy, without the need to separately inject liquid into the second cavity through other structures or pipelines, thus simplifying the overall structure of the water pump and avoiding the possibility of noise generated by other structures for realizing separate liquid injection. The inlet and the outlet of the second cavity are arranged at two ends of the second cavity, so that the liquid flows for a longer distance in the second cavity and is not immediately discharged, and vibration energy is fully absorbed.

[0013] Preferably, the first cavity and the second cavity are in communication through a flow channel structure.

[0014] The flow channel structure comprises a water inlet end in communication with the first cavity and a water outlet end in communication with the second cavity, and the cross-sectional area of the water outlet end is greater than that of the water inlet end.

[0015] In the scheme, the flow channel structure is adopted, and the water inlet end and the water outlet end are arranged in the above cross-sectional area size relationship, so that the liquid flows orderly along the flow direction, the flow speed is effectively reduced, the high-speed turbulent fluid after being pressurized by the motor module is combed, the vibration is reduced, and thus the noise is reduced.

[0016] Preferably, the flow channel structure is divided into a plurality of sub-flow channels.

[0017] In the scheme, the flow channel structure is divided into a plurality of sub-flow channels, and the overall high-speed turbulent fluid is divided into smaller fluid in the sub-flow channels, so that the vibration generated by the high-speed liquid fluid is further reduced, and thus the noise is reduced.

[0018] Preferably, each sub-flow channel is smoothly expanded along the water flow direction from the water inlet end to the water outlet end.

[0019] In the scheme, the liquid flow in each sub-flow passage slows down in step with the pressure, and the effect of combing the turbulent water flow is better, which is conducive to reducing noise.

[0020] Preferably, the flow passage structure is detachably connected with the body of the water pump.

[0021] In the scheme, the detachable connection mode is adopted, so that the water pump can be conveniently replaced with different specifications and shapes of flow passage structures according to the pressure size or other needs, and it is convenient to select appropriate flow passage structures according to the need to reduce noise.

[0022] Preferably, the material of the flow passage structure includes a scale removal material.

[0023] In the scheme, the scale removal material is in full contact with the water flow, which inhibits the generation of scale, avoids the attachment of scale in the second cavity, and avoids the influence of scale accumulation on the stability of water flow and the noise reduction effect.

[0024] A water heater comprises the water pump as described above.

[0025] In the scheme, the water heater comprising the water pump described above reduces the noise of the water pump, thereby realizing the noise reduction of the water heater.

[0026] Preferably, the first cavity and the second cavity are communicated through the flow passage structure, the second cavity is provided with an electric heating module, the electric heating module is electrically connected with an external power supply, and is used for heating water in the second cavity.

[0027] In the scheme, through the above-mentioned arrangement, the water heater integrates two functions (the function of the motor module to increase the pressure of the water flow to provide water flow power and the function of the electric heating module to heat water) in the same water pump structure, the structure is compact, and the arrangement space in the water heater is saved. Compared with the gas heating water mode, the electric heating mode does not have the noise generated by gas combustion, fan gas supply and smoke exhaust, etc., which greatly reduces the effect of the water heater. Moreover, the second cavity is directly communicated with the first cavity (water pump cavity), and there is no interval between the two cavities, which accelerates the mixing of water flow in the second cavity, the electric heating heat is more evenly distributed, so that the effect of electric heating is high, and the proportion of gas heating or the use of gas can be reduced, which is conducive to reducing noise.

[0028] Preferably, the second cavity comprises an inlet communicated with the first cavity, and the inlet and an outlet of the second cavity are respectively arranged at two ends of the electric heating module along the arrangement direction of the electric heating module.

[0029] In the scheme, by setting the inlet and outlet of the second cavity at the two ends of the electric heating module along the setting direction of the electric heating module, the water flow is fully contacted with the electric heating module in the second cavity, higher heat exchange efficiency is achieved, and the proportion of gas heating can be reduced or gas heating is not used at all, which is beneficial to reducing noise during use of the water heater.

[0030] Preferably, the electric heating module comprises a spiral electric heating component.

[0031] In the scheme, the spiral electric heating component guides the water flow, which is easy to form a spiral vortex, which is beneficial to full heat exchange with the electric heating component and smooth flow of the water flow in the second cavity, reduces vibration generated by the water flow, and reduces noise.

[0032] Preferably, the material of the flow channel structure comprises a scale removal material.

[0033] In the scheme, the scale removal material is fully contacted with the water flow, scale generation is inhibited, and scale is prevented from adhering and accumulating in the second cavity to cause a decrease in electric heating efficiency, resulting in the use of gas heating or an increase in the proportion of gas heating, which is beneficial to guaranteeing the noise reduction effect. At the same time, scale accumulation also affects the smoothness of the water flow and affects the noise reduction effect.

[0034] The positive progress effect of the present application is that the water pump and the water heater comprising the same surround the outer wall of the first cavity by at least part of the second cavity, and inject liquid into the second cavity, so that the liquid in the second cavity adheres to the outer wall of the first cavity, and the viscous resistance of the liquid does negative work to absorb the vibration energy generated by the motor module and transmitted to the outer wall of the first cavity, thereby reducing the noise generated by vibration. At the same time, the injection of liquid into the second cavity increases the overall mass of the water pump, thereby reducing the vibration amplitude of the water pump in operation and reducing the noise of the water pump in operation. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a three-dimensional structure schematic diagram of the water pump in embodiment 1 of the present application.

[0036] Figure 2 It is a three-dimensional structure schematic diagram of the water pump in embodiment 1 of the present application after removing the upper cover.

[0037] Figure 3 It is a front view of the water pump in embodiment 1 of the present application.

[0038] Figure 4 It is a half-sectional view of the water pump in embodiment 1 of the present application.

[0039] Figure 5 It is Figure 3 It is a sectional view along the A-A direction.

[0040] Figure 6 This is a schematic diagram of the water heater in Embodiment 2 of the present invention.

[0041] Figure 7 This is a three-dimensional structural diagram of the water pump in Embodiment 2 of the present invention.

[0042] Figure 8 This is a half-sectional view of the water pump in Embodiment 2 of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] Water pump 20,

[0045] Top cover 21, main body 22, base 23,

[0046] First cavity 24, motor module 242, water inlet 243.

[0047] Second cavity 25, inlet 252, outlet 252.

[0048] Flow channel structure 26, slide rail structure 261, water outlet 262, water inlet 263, sub-flow channel 264.

[0049] Water heater 1,

[0050] 2. Water flow valve assembly; 3. Electronic controller; 4. Air inlet; 5. Fan; 6. Gas distribution system; 7. Combustion chamber; 8. Heat exchanger; 9. Inlet water temperature sensor; 10. Outlet water temperature sensor.

[0051] Inlet pipe 11, outlet pipe 12, connecting pipe 13,

[0052] 14 faucets, 15 external pipes

[0053] 30mm cap, 40mm electrical connector

[0054] Electric heating module 50, electric heating component 51. Detailed Implementation

[0055] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0056] Example 1

[0057] like Figures 1-5 As shown, this embodiment provides a water pump 20, which can be used in devices that use a water pump to provide water flow power, thereby reducing noise during device operation. Such devices can be electrical appliances such as water heaters and dishwashers.

[0058] The housing of the water pump 20 comprises a cover 21, a body 22 and a base 23, the cover 21 and the base 23 are respectively connected to the body 22 in a sealed manner through bolts around the outer periphery, and the internal space between the cover 21 and the base 23 and the body 22 constitutes two cavities, which are respectively a first cavity 24 and a second cavity 25.

[0059] The motor module 242 is arranged in the first cavity 24 to pressurize the water flow in the first cavity 24, so that the water pump 20 can realize the function of pressurization, and therefore the first cavity 24 is also called a water pump cavity, and the motor module 242 comprises a impeller and other components capable of pressurizing the water flow. The water flow enters from the water inlet 243 of the first cavity 24, and the impeller pressurizes the water flow to provide power for the circulating water of the water heater.

[0060] Part of the second cavity 25 surrounds the outer wall of the first cavity 24, forming a semi-enclosed structure, so that the first cavity 24 and the second cavity 25 share the same housing structure. The second cavity 25 is filled with liquid.

[0061] Through the above semi-enclosed structure, the liquid in the second cavity 25 can adhere to the outer wall of the first cavity 24, and the negative work of the viscous resistance of the liquid can be used to absorb the vibration energy generated by the motor module 242 and transmitted to the outer wall of the first cavity 24, thereby reducing the noise generated by the vibration. At the same time, the liquid is injected into the second cavity 25, which increases the overall mass of the water pump 20, thereby reducing the vibration amplitude of the water pump 20 during operation and reducing the operating noise.

[0062] In this embodiment, the liquid is water, but in other embodiments, other liquids that are more conducive to vibration absorption can also be used for better vibration absorption effect. According to the needs of the specific structure shape, the surrounding form of the second cavity 25 to the first cavity 24 can also adopt a larger angle range of surrounding, or even a full-enclosed manner. Since the noise reduction principle of this structure is to use the negative work of the viscous resistance of water to generate the ability to absorb vibration, therefore, the more water, the more energy absorbed by water, and the smaller the frequency and amplitude of vibration; the less water, the larger the amplitude, and the higher the pitch. Therefore, when using a full-enclosed structure, the entire surrounding cavity is filled with water, and the vibration reduction and noise reduction effect is better.

[0063] However, compared with the full-enclosed structure, the semi-enclosed structure of the present embodiment can not only produce effective vibration absorption and noise reduction effect, but also make the overall structure compact, which is conducive to the installation and arrangement of the water pump 20 in the limited internal space of the water heater.

[0064] The first cavity 24 and the second cavity 25 are connected by a flow channel structure 26. Water flows from the first cavity 24 into the second cavity 25 through the flow channel structure 26. The flow channel structure 26 includes an inlet end 263 connected to the first cavity 24 and an outlet end 262 connected to the second cavity 25. The second cavity 25 includes an inlet 252 connected to the first cavity 24, which is also the outlet end 262 of the flow channel structure 26. The flow channel structure 26 is located at the top of the first cavity 24 and the second cavity 25, and the outlet 252 of the second cavity 25 is located at the bottom of the second cavity 25. That is, the inlet 252 and the outlet 252 are respectively located at both ends of the second cavity 25 along its axial direction. Water enters the second cavity 25 from the inlet 252 and flows out from the outlet 252.

[0065] In other embodiments, the second cavity 25 may not be connected to the first cavity 24. Instead, liquid may be injected into the second cavity 25 through a separate channel or structure, or the second cavity 25 may be filled with a sealed liquid. The water in the first cavity 24 may flow directly into the circulation pipe after being pressurized. However, such a structure requires a separate injection channel or structure, which may make the overall structure of the water pump 20 complex and larger, and may also generate noise or affect noise reduction. Therefore, as in this embodiment, the first cavity 24 and the second cavity 25 are connected, and the water pressurized in the first cavity 24 by the motor module 242 is directly injected into the second cavity 25 to achieve the effect of absorbing vibration energy, simplifying the overall structure of the water pump 20, and avoiding the possibility of other structures generating noise or affecting noise reduction. In other embodiments, the positions of the outlet end 262 of the flow channel structure 26 (which is also the inlet 252 of the second cavity 25) and the outlet 252 of the second cavity 25 can be adjusted according to the specific structural shape. However, it is better to set the inlet 252 and the outlet 252 at both ends of the second cavity 25 along the axial direction of the second cavity 25, so that the liquid can flow a longer distance in the second cavity 25 and will not be discharged immediately, thus fully absorbing the vibration energy.

[0066] Among them, such as Figure 2 As shown, the flow channel structure 26 is a separate component, which is detachably connected by inserting its surface slide rail structure 261 into the slide groove (not shown in the figure) of the upper cover 21. This detachable connection method allows the flow channel structure 26 to be easily replaced with different specifications and shapes according to the water pressure or other needs, making it convenient to select a suitable flow channel structure 26 according to the need to reduce noise.

[0067] like Figure 5As shown, the flow channel 264 of the flow channel structure 26 is arranged along the water flow direction to form a streamlined flow channel shape. The cross-sectional area of the water outlet end 262 is larger than that of the water inlet end 263, forming a diffusion-shaped flow channel structure 26. The use of such a diffusion-shaped flow channel structure 26 allows the water flow to flow orderly along its flow direction, effectively reducing the water flow speed, smoothing the high-speed turbulent water flow after pressurization, reducing vibration, and thus reducing noise.

[0068] In this embodiment, the flow channel structure 26 is horizontally divided into several sub-flow channels 264, which divides the overall high-speed turbulent water flow into smaller water flows in the sub-flow channels 264, further reducing the vibration generated by the high-speed water flow, thereby reducing noise. Moreover, each sub-flow channel 264 expands in a smooth arc shape from the water inlet end 263 to the water outlet end 262 along the water flow direction, forming a smooth and large diffusion-shaped flow channel, so that the water flow slows down in each sub-flow channel 264 in a consistent pace, achieving a better effect of smoothing the turbulent water flow, which is conducive to reducing noise.

[0069] In other embodiments, in addition to horizontal division, the flow channel structure 26 can also be vertically divided and divided in other forms as needed.

[0070] In this embodiment, the material of the flow channel structure 26 includes a scale removal material. Specifically, the scale removal material is an IPSE (Ion Polarization System Energy) zero-carbon energy storage scale removal alloy material. The water flow is in full contact with the scale removal material, which can effectively inhibit the formation of scale. On the one hand, it avoids the attachment and accumulation of scale in the second cavity 25, which reduces the efficiency of electric heating and leads to the use of gas heating or an increase in the proportion of gas heating. However, the use of gas heating or an increase in the proportion of gas heating is not conducive to reducing noise. Therefore, the use of scale removal material is also conducive to ensuring the noise reduction effect. On the other hand, scale accumulation can affect the stability of the water flow in the flow channel, thereby increasing noise. Therefore, the use of scale removal material also avoids affecting the stability of the water flow and affecting the noise reduction effect.

[0071] In other embodiments, according to the application of different devices, different functional modules can be installed in the second cavity 25 as needed to save space occupied by other functional modules and the water pump 20.

[0072] Embodiment 2

[0073] As shown in Figure 6 This embodiment provides a water heater 1, specifically a gas water heater 1 with a zero-cold-water circulation function.

[0074] The water heater 1 comprises the water pump 20 and the water volume valve assembly 2, the electric controller 3, the fan 5, the gas distribution system 6, the combustion chamber 7, the heat exchanger 8, the inlet water temperature sensor 9, the outlet water temperature sensor 10, and the pipes connected in the water heater 1. The gas enters from the gas inlet 4, is combusted in the combustion chamber 7 by the action of the gas distribution system 6 and the fan 5, and the heat generated is exchanged with the cold water in the pipes at the heat exchanger 8.

[0075] The inlet water temperature sensor 9 and the outlet water temperature sensor 10 detect the water temperature of the inlet pipe 11 and the outlet pipe 12 respectively to determine whether the water heater 1 is in operation. The electric controller 3 is electrically connected with the water volume valve assembly 2, the water pump 20, the fan 5, the gas distribution system 6, the inlet water temperature sensor 9, the outlet water temperature sensor 10, and the like to control the cooperative operation of the components of the water heater 1.

[0076] The external tap water enters the inlet pipe 11 of the water heater 1, flows through the water volume valve assembly 2 and the water pump 20 in sequence, is heated in the heat exchanger 8 in the water heater 1, and then flows out from the outlet pipe 12 of the water heater 1 to the faucet 14 to provide hot water for the user. At the same time, the pipe at the faucet 14 is connected to the inlet pipe 11 of the water heater 1 through the external pipe 15 to form a "zero cold water" pipe circuit to return the cold water in the pipe to the water heater 1 for reheating.

[0077] The water volume valve assembly 2 has two channels, a main channel and a bypass channel. The main channel is connected to the heat exchanger 8 in the water heater 1, and the bypass channel is connected to the outlet pipe 11 of the water heater 1 through the connecting pipe 13 to form a bypass circuit. The electric controller 3 controls the water volume valve assembly 2 to adjust the water volume of the main channel, i.e., to adjust the water volume for heating, and controls the water volume valve assembly 2 to return the cold water in the outlet pipe to the water heater 1 through the bypass channel for circulation and heating.

[0078] As shown in FIG. 1, Figure 6 The water pump 20 is located in the circulation pipe to provide flow power for the circulation of the cold water in the pipe in the water heater 1 and the cold water flowing into the external pipe. The water heater 1 reduces the noise of the water pump 20 by using the water pump 20 as in Embodiment 1, thereby achieving noise reduction of the water heater 1.

[0079] As shown in FIG. 1, Figure 7As shown, the second cavity 25 is provided with an electric heating module 50, and the second cavity 25 is also called an electric heating cavity. The top of the second cavity 25 is provided with a cover 30, and the main body of the electric heating module 50 is enclosed below the cover 30 and is electrically connected with an external power supply through an electric connection head 40 extending to the surface of the cover 30. After the water flow is pressurized in the first cavity 24, it directly flows into the second cavity 25, and the electric heating module 50 heats the water in the second cavity 25.

[0080] In the embodiment, the electric heating module 50 is mainly used to heat the circulating cold water in the "zero cold water" water pipe circuit and the bypass circuit, and the circulating cold water is heated in an electric heating mode instead of a gas heating mode. The gas heating is mainly used to heat the cold water flowing into the external pipeline in a non-"zero cold water" function mode. The motor module 242 and the electric heating module 50 are electrically connected with the electric controller 3, and the speed, power and other parameters of the water pump 20 are controlled to be coordinated with the operation of the electric heating module 50, so as to optimize the heating efficiency of the electric heating module. Compared with the gas heating water mode, the electric heating mode does not have the noise generated by gas combustion, gas fan and exhaust smoke, and greatly reduces the noise effect of the water heater 1.

[0081] Through the above arrangement, the water heater 1 integrates two functions (the function of the motor module to pressurize the water flow to provide water flow power and the function of the electric heating module to heat the water) in the same water pump 20 structure, which is compact in structure and saves the arrangement space in the water heater 1.

[0082] In other embodiments, according to the power size and noise reduction effect of the electric heating module 50, the electric controller 3 can coordinate the control of the proportion and operation mode of the gas heating and the electric heating, and increasing the power of the electric heating module 50 can reduce the proportion of the gas heating or completely replace the gas heating, thereby being beneficial to reducing the noise effect of the water heater 1.

[0083] In the embodiment, the second cavity 25 (electric heating cavity) directly communicates with the first cavity 24 (water pump cavity), and there is no interval between the two, which accelerates the mixing of the water flow in the electric heating cavity and makes the electric heating heat distribution more uniform, so that the electric heating effect is high, and the proportion of gas heating can be reduced or gas is not used, and therefore, it is beneficial to reduce the noise.

[0084] As shown in the figure, Figure 8 The inlet 252 and the outlet 252 of the second cavity 25 are respectively arranged at the two ends of the electric heating module 50 along the arrangement direction of the electric heating module 50, so that the water flow fully contacts the electric heating module 50 in the second cavity 25, and a higher heat exchange efficiency is achieved.

[0085] The electric heating module 50 comprises a spiral electric heating component 51. When the pressurized water flow passes through the flow channel structure 26 for buffering and carding and enters the second cavity 25, the water flow is further guided by the spiral electric heating component 51 to form a spiral vortex, which is conducive to sufficient heat exchange with the electric heating component 51 and smooth flow of the water flow in the second cavity 25, reduces vibration of the water flow, and reduces noise.

[0086] The material of the flow channel structure 26 comprises a descaling material, specifically, the descaling material is an IPSE (Ion Polarization System Energy) zero-carbon energy storage type scale inhibition and removal alloy material. The water flow is in sufficient contact with the descaling material, which can effectively inhibit scale formation. On the one hand, it avoids the problem that scale accumulation in the second cavity 25 reduces the electric heating efficiency, which leads to the use of gas heating or an increase in the proportion of gas heating. However, the use of gas heating or an increase in the proportion of gas heating is not conducive to noise reduction. Therefore, the use of the descaling material is also conducive to ensuring the noise reduction effect. On the other hand, scale accumulation affects the stability of the water flow in the flow channel, thereby increasing the noise. Therefore, the use of the descaling material also avoids the problem that scale accumulation affects the stability of the water flow and affects the noise reduction effect.

[0087] In other embodiments, the water pump 20 can also be applied to other water heaters 1 without the cold water zero function or other devices using a water pump to provide water flow, to reduce the noise of the device during use. Depending on the device to which the water pump 20 is applied, other components with different functions can also be arranged in the second cavity 25.

[0088] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example. The protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application. These changes and modifications are also within the protection scope of the present application.

Claims

1. A water pump comprising a motor module and a first cavity, the motor module being disposed within the first cavity, characterized in that, The first cavity is a circular cavity, The water pump further comprises a second cavity for injecting liquid, part of the second cavity surrounding the annular outer wall of the first cavity to form a semi-enclosed structure to absorb the vibration energy generated by the motor module and transmitted to the outer wall of the first cavity. The first cavity and the second cavity are communicated through a flow channel structure, the flow channel structure comprising a water inlet end communicated with the first cavity and a water outlet end communicated with the second cavity, the cross-sectional area of the water outlet end being larger than that of the water inlet end, the flow channel structure being divided into several sub-flow channels, each of the sub-flow channels being smoothly arc-shaped expanded along the water flow direction from the water inlet end to the water outlet end to form a diffused flow channel with smooth and large variation.

2. The water pump of claim 1, wherein The second cavity comprises an inlet communicated with the first cavity, the inlet and the outlet of the second cavity being respectively arranged at two ends of the second cavity along the axial direction of the second cavity.

3. The water pump of claim 1, wherein The flow channel structure is detachably connected with the body of the water pump.

4. The water pump according to any one of claims 1 to 3, characterized in that, The material of the flow channel structure comprises a scale-removing material.

5. A water heater, characterised by The water heater comprises the water pump according to any one of claims 1-4.

6. The water heater of claim 5, wherein the controller is configured to: An electric heating module is arranged in the second cavity, the electric heating module being electrically connected with an external power supply to heat the water in the second cavity.

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