Flow dividing support for water pump, water pump and water heater

Abstract

The utility model relates to the field of water heaters, in particular to a flow dividing support for a water pump, the water pump and the water heater. The shunting bracket comprises a shell, a water blocking piece and an elastic piece, the water inlet is formed in the first end of the shell, the water outlet is formed in the second end of the shell, the inner cavity is formed in the shell, and the water inlet and the water outlet are both communicated with the inner cavity; the inner cavity is in a shape converging from the first end to the second end, the water blocking piece is arranged in the inner cavity, and a fluid channel is formed between the water blocking piece and the wall face of the inner cavity. The elastic member biases the water blocking member in a direction that causes the water blocking member to face the first end from the second end. The total displacement (water flow = flow velocity * area) of the diversion support can be kept fluctuating within a certain range, and the situation that the water pressure is increased and the displacement is suddenly increased is avoided, so that the stability of the water yield is ensured, and better experience is brought to a user.

Description

Technical Field

[0001] The utility model relates to the field of water heaters, in particular to a flow dividing bracket for a water pump, a water pump and a water heater. Background Art

[0002] Nowadays, people pursue quality life. When using water heaters, booster pumps are often used to achieve sufficient water for bathing. When water enters the water pump from the water inlet pipe, it will directly impact the central axis and sleeve of the water pump impeller, and the water flow will produce turbulence at the water inlet bend, resulting in an unbalanced impact force of the water coming down the straight path on the shaft and sleeve, causing the impeller to have a large horizontal shake. If the impeller shakes horizontally during operation, it will have a significant negative impact on the flow rate, head and overall performance of the water pump, resulting in reduced performance. Therefore, a diverter bracket needs to be added to the water pump shaft.

[0003] At the same time, since there is a certain pressure fluctuation in the tap water pipe, this pressure fluctuation will be transmitted to the water heater through the water pump, causing the water output of the water heater to fluctuate, affecting the user experience, so it is more meaningful to stabilize the water flow while diverting the water. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defect of the prior art that the water pressure cannot be stabilized when the water inlet in the water pump is diverted, and to provide a diverter bracket for the water pump, a water pump and a water heater.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A flow splitter bracket for a water pump, comprising: a shell, a water blocking member and an elastic member;

[0007] The shell has a water inlet at a first end of the shell, a water outlet at a second end of the shell, and an inner cavity inside the shell, and the water inlet and the water outlet are both in communication with the inner cavity;

[0008] The inner cavity is formed into a shape converging from the first end toward the second end, the water blocking member is arranged in the inner cavity and a fluid channel is formed between the water blocking member and the wall surface of the inner cavity;

[0009] The elastic member biases the water blocking member in a direction causing the water blocking member to move from the second end toward the first end.

[0010] In the present embodiment, the inner cavity of the diverter bracket converges from the first end toward the second end, so that when the water blocking member moves from the first end toward the second end, the cross-sectional area of ​​the fluid channel formed between the water blocking member and the wall of the inner cavity of the diverter bracket gradually decreases. Therefore, when the water pressure flowing through the diverter bracket is greater, although the flow rate of the drainage of the diverter bracket increases, the drainage area decreases. When the water pressure flowing through the diverter bracket decreases, although the flow rate of the drainage of the diverter bracket decreases, the drainage area increases. Therefore, the total drainage volume will not increase significantly with the increase of the water pressure flowing through the diverter bracket or decrease significantly with the decrease of the water pressure flowing through the diverter bracket. Instead, as the water blocking member moves, the total drainage volume of the diverter bracket (water flow rate = flow rate × area) will remain within a certain range and will not suddenly increase with the increase of water pressure, thereby ensuring the stability of the water output and bringing a better experience to the user.

[0011] Preferably, a clamping portion is provided at the first end of the shell.

[0012] In this solution, a snap-fit ​​portion is provided at the first end of the shell, so that the flow-dividing bracket can be easily installed in the water pump.

[0013] Preferably, the first end of the shell is provided with a plurality of partitions arranged at circumferential intervals, and the engaging portion is provided on the partitions.

[0014] In this solution, since the multiple partitions are spaced apart from each other, the ends of adjacent partitions close to the first end have a certain elasticity and can be gathered together and separated, so that the clamping portion can be elastically clamped with the water inlet pipe of the water pump.

[0015] Preferably, the inner cavity is formed in a truncated cone shape, and the water blocking member is formed in a disc shape.

[0016] In this solution, the truncated cone-shaped inner cavity is adapted to the shape of the water inlet pipe, and the water blocking member is formed into a disc shape according to the shape of the inner cavity, thereby forming a fluid channel with uniform circumferential size.

[0017] Preferably, a base is provided at the second end of the housing;

[0018] The base is provided with a drain port, and the drain port communicates with the inner cavity and the outer side of the shell.

[0019] In this solution, water in the inner cavity of the shell is drained through the drain port on the base to prevent water from being retained in the inner cavity of the shell.

[0020] Preferably, the drain port is provided on a surface of the base facing the shell.

[0021] In this solution, by arranging the drain port on the surface of the base facing the shell, it is possible to prevent the water flow from directly impacting the other side of the base, thereby impacting the shaft and sleeve of the impeller of the water pump.

[0022] Preferably, the base protrudes in an annular shape toward the outer circumference relative to the housing.

[0023] In this solution, the base protrudes in a ring shape toward the outer periphery. The water is first briefly stored and pressure-stabilized in the inner cavity before flowing out to the periphery and the bottom. This allows the water to flow more evenly in all directions toward the impeller, making the operation of the impeller more stable without causing large up and down shaking to cause energy loss, thereby increasing the flow rate and lift of the water pump.

[0024] Preferably, an avoidance groove is provided on a surface of the base opposite to the shell.

[0025] In this solution, a relief groove is provided on the base, and the shaft of the impeller can be partially inserted into the relief groove, thereby avoiding the increase in the size of the water pump due to the installation of the diverter bracket.

[0026] A water pump comprises: a housing, an impeller arranged inside the housing and the flow splitter bracket as described above;

[0027] The housing comprises a water inlet pipe, and the flow splitter bracket is at least partially arranged in the water inlet pipe and located at the upstream side of the impeller.

[0028] In the present embodiment, the inner cavity of the diverter bracket in the water pump converges from the first end toward the second end, so that when the water blocking member moves from the first end toward the second end, the cross-sectional area of ​​the fluid channel formed between the water blocking member and the wall of the inner cavity of the diverter bracket gradually decreases. Therefore, when the water pressure flowing through the diverter bracket is greater, although the flow rate of the drainage of the diverter bracket increases, the drainage area decreases. When the water pressure flowing through the diverter bracket decreases, although the flow rate of the drainage of the diverter bracket decreases, the drainage area increases. Therefore, the total drainage volume will not increase significantly with the increase of the water pressure flowing through the diverter bracket or decrease significantly with the decrease of the water pressure flowing through the diverter bracket. Instead, as the water blocking member moves, the total drainage volume of the diverter bracket (water flow rate = flow rate × area) will fluctuate within a certain range, and there will be no situation where the drainage volume suddenly increases due to the increase of water pressure, thereby ensuring the stability of the water output and bringing a better experience to the user.

[0029] A water heater comprises the water pump as described above.

[0030] In the present embodiment, the inner cavity of the diverter bracket in the water pump of the water heater converges from the first end toward the second end, so that when the water blocking member moves from the first end toward the second end, the cross-sectional area of ​​the fluid channel formed between the water blocking member and the wall of the inner cavity of the diverter bracket gradually decreases. Therefore, when the water pressure flowing through the diverter bracket is greater, although the flow rate of the drainage of the diverter bracket increases, the drainage area decreases. When the water pressure flowing through the diverter bracket decreases, although the flow rate of the drainage of the diverter bracket decreases, the drainage area increases. Therefore, the total drainage volume will not increase significantly with the increase of the water pressure flowing through the diverter bracket or decrease significantly with the decrease of the water pressure flowing through the diverter bracket. Instead, as the water blocking member moves, the total drainage volume of the diverter bracket (water flow rate = flow rate × area) will remain within a certain range and fluctuate. There will be no situation where the drainage volume suddenly increases due to the increase of water pressure and the water temperature of the water heater outlet water decreases, thereby ensuring the stability of the water outlet volume and water outlet temperature, bringing a better experience to users.

[0031] The positive progressive effect of the present invention is that the inner cavity of the diverter bracket converges from the first end toward the second end, so that when the water blocking component moves from the first end toward the second end, the cross-sectional area of ​​the fluid channel formed between the water blocking component and the wall of the inner cavity of the diverter bracket gradually decreases. Therefore, when the water pressure flowing through the diverter bracket is greater, although the flow rate of the drainage of the diverter bracket increases, the drainage area decreases. When the water pressure flowing through the diverter bracket decreases, although the flow rate of the drainage of the diverter bracket decreases, the drainage area increases. Therefore, the total drainage volume will not increase significantly with the increase of the water pressure flowing through the diverter bracket or decrease significantly with the decrease of the water pressure flowing through the diverter bracket. Instead, as the water blocking component moves, the total drainage volume of the diverter bracket (water flow rate = flow rate × area) will remain within a certain range and will not suddenly increase due to the increase in water pressure, thereby ensuring the stability of the water output and bringing a better experience to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of a fluid support according to an embodiment of the utility model.

[0033] Figure 2 It is a schematic diagram of the cross-sectional structure of a fluid support according to an embodiment of the utility model, wherein the spring is in a compressed state.

[0034] Figure 3 This is another schematic cross-sectional structure diagram of a fluid support according to an embodiment of the utility model, wherein the spring is in an uncompressed state.

[0035] Figure 4 It is a schematic diagram of the three-dimensional structure of a water pump according to an embodiment of the utility model.

[0036] Figure 5It is a schematic cross-sectional structure diagram of a water pump according to an embodiment of the utility model.

[0037] Description of reference numerals:

[0038] Shunt Stent 100

[0039] Housing 110

[0040] First End 111

[0041] Second end 112

[0042] Water Inlet 113

[0043] Water outlet 114

[0044] Lumen 115

[0045] Engagement portion 116

[0046] Partition 117

[0047] Fluid channel 118

[0048] Base 120

[0049] Drain 121

[0050] Avoidance slot 122

[0051] Water blocking parts 130

[0052] Elastic member 140

[0053] Water pump 200

[0054] Shell 201

[0055] Water inlet pipe 210

[0056] Outlet pipe 220

[0057] Main body 230

[0058] Impeller 240

[0059] Axis 241

[0060] Bushing 242 DETAILED DESCRIPTION

[0061] The present invention is further described below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0062] like Figure 1-3 As shown, this embodiment provides a flow splitter bracket 100 for a water pump 200 . The flow splitter bracket 100 includes: a housing 110 , a water blocking member 130 and an elastic member 140 .

[0063] The shell 110 is provided with a water inlet 113 at the first end 111 of the shell 110 , a water outlet 114 at the second end 112 of the shell 110 , and an inner cavity 115 disposed inside the shell 110 , and the water inlet 113 and the water outlet 114 are both connected to the inner cavity 115 .

[0064] The water inlet 113 is a through hole extending in the direction of the axis 241. The water outlet 114 is a plurality of holes arranged in the circumferential direction. Alternatively, the water outlet 114 may also be a long hole extending in the circumferential direction.

[0065] The inner cavity 115 is formed in a shape converging from the first end 111 toward the second end 112 . The water blocking member 130 is disposed in the inner cavity 115 and a fluid channel 118 is formed between the water blocking member 130 and a wall surface of the inner cavity 115 .

[0066] The elastic member 140 biases the water blocking member 130 in a direction such that the water blocking member 130 moves from the second end 112 toward the first end 111 .

[0067] The inner cavity 115 of the diverter bracket 100 converges from the first end 111 toward the second end 112, so that when the water blocking member 130 moves from the first end 111 toward the second end 112, the cross-sectional area of ​​the fluid channel 118 formed between the water blocking member 130 and the wall surface of the inner cavity 115 of the diverter bracket 100 gradually decreases. Therefore, when the water pressure flowing through the diverter bracket 100 is greater, although the flow rate of the drainage of the diverter bracket 100 increases, the drainage area decreases. When the water pressure flowing through the diverter bracket 100 decreases, although the diverter bracket 100 is smaller, the drainage area decreases. The drainage flow rate of the flow bracket 100 is reduced, but the drainage area is increased, so the total drainage volume will not increase significantly with the increase of the water pressure flowing through the diverter bracket 100, or decrease significantly with the decrease of the water pressure flowing through the diverter bracket 100. Instead, as the water blocking member 130 moves, the total drainage volume (water flow rate = flow rate × area) of the diverter bracket 100 will fluctuate within a certain range, and the drainage volume will not suddenly increase due to the increase in water pressure, thereby ensuring the stability of the water output and bringing a better experience to the user.

[0068] The first end 111 of the housing 110 is provided with a snap-fitting portion 116. By providing the snap-fitting portion 116 at the first end 111 of the housing 110, it is convenient to install the flow splitter bracket 100 into the water pump 200.

[0069] In this embodiment, the engaging portion 116 is a protrusion provided at the first end 111 of the housing 110 , but the present invention is not limited thereto, and those skilled in the art may also provide the engaging portion 116 with other existing structures as required.

[0070] The first end 111 of the housing 110 is provided with a plurality of partitions 117 spaced apart from each other in the circumferential direction, and the engaging portions 116 are provided on the partitions 117 .

[0071] Since the multiple partitions 117 are spaced apart from each other, the ends of adjacent partitions 117 close to the first end 111 have a certain elasticity and can be gathered together and separated, so that the engaging portion 116 can be elastically engaged with the water inlet pipe 210 of the water pump 200 .

[0072] The inner cavity 115 is formed in a truncated cone shape, and the water blocking member 130 is formed in a disc shape.

[0073] The truncated cone-shaped inner cavity 115 is adapted to the shape of the water inlet pipe 210 , and the water blocking member 130 is formed into a disc shape according to the shape of the inner cavity 115 , thereby forming a fluid channel 118 with a uniform circumferential size.

[0074] In other embodiments, the inner cavity 115 may also be a square-shaped structure with a rectangular cross section, etc. The water blocking member 130 may be formed into a corresponding shape, such as a rectangle, according to the cross-sectional shape of the inner cavity 115, or may not correspond to the cross-sectional shape of the inner cavity 115, which does not affect the implementation of the present invention. As long as the inner cavity 115 converges from the first end 111 toward the second end 112, the fluid channel 118 between the water blocking member 130 and the wall of the inner cavity 115 will change with the movement of the water blocking member 130.

[0075] In this embodiment, the water blocking member 130 is a sheet-like structure, but the present invention is not limited thereto, and those skilled in the art may also configure the water blocking member 130 to be a block-like or special-shaped structure as required, which does not affect the implementation of the present invention.

[0076] In this embodiment, the elastic member 140 is a spring in a compressed state arranged on one side of the water blocking member 130 close to the second end 112, but the utility model is not limited thereto, and those skilled in the art may also arrange a spring in a stretched state on one side of the water blocking member 130 close to the first end 111 as needed, so other structural adaptive changes made by those skilled in the art may be made as needed. Optionally, the elastic member 140 may also be other existing elastic structures besides a spring.

[0077] The second end 112 of the housing 110 is provided with a base 120 , and the base 120 is provided with a drain port 121 , and the drain port 121 communicates the inner cavity 115 with the outside of the housing 110 . The base 120 closes the second end 112 of the housing 110 .

[0078] The water in the inner cavity 115 of the housing 110 is drained through the drain port 121 on the base 120 to prevent the water from being retained in the inner cavity 115 of the housing 110 .

[0079] In this embodiment, the drain port 121 includes a plurality of drain holes circumferentially arranged on the base 120, through which water in the inner cavity 115 of the housing 110 is drained. Alternatively, only one drain port 121 may be provided, or it may be a long hole extending circumferentially.

[0080] The drain port 121 is disposed on the surface of the base 120 facing the housing 110. By disposing the drain port 121 on the surface of the base 120 facing the housing 110, it is possible to prevent the water flow from directly impacting the other side of the base 120, thereby impacting the shaft 241 and the sleeve 242 of the impeller 240 of the water pump 200.

[0081] The base 120 protrudes in an annular shape toward the outer circumference relative to the housing 110. The base 120 protrudes in an annular shape toward the outer circumference. This method in which water is first briefly stored and pressure-stabilized in the inner cavity 115 before flowing out to the periphery and the bottom can make the water flow more uniform when flowing to all directions of the impeller 240, making the operation of the impeller 240 more stable without causing large up and down shaking to cause energy loss, thereby improving the flow rate and lift of the water pump 200.

[0082] The base 120 is provided with an escape groove 122 on the surface opposite to the housing 110. The escape groove 122 is provided on the base 120, and the shaft 241 of the impeller 240 can be partially inserted into the escape groove 122, thereby avoiding the increase in the size of the water pump 200 due to the installation of the diverter bracket 100.

[0083] like Figure 4-5 As shown, this embodiment further provides a water pump 200, which includes: a housing 201, an impeller 240 disposed inside the housing 201, and the above-mentioned flow splitter bracket 100.

[0084] The housing 201 includes a water inlet pipe 210 , and the flow splitter bracket 100 is at least partially disposed in the water inlet pipe 210 and located at the upstream side of the impeller 240 .

[0085] The inner cavity 115 of the diverter bracket 100 in the water pump 200 converges from the first end 111 toward the second end 112, so that when the water blocking member 130 moves from the first end 111 toward the second end 112, the cross-sectional area of ​​the fluid channel 118 formed between the water blocking member 130 and the wall surface of the inner cavity 115 of the diverter bracket 100 gradually decreases. Therefore, when the water pressure flowing through the diverter bracket 100 is greater, although the flow rate of the drainage of the diverter bracket 100 increases, the drainage area decreases. When the water pressure flowing through the diverter bracket 100 decreases, Although the flow rate of the drainage of the diverter bracket 100 is reduced, the drainage area is increased, so the total drainage volume will not increase significantly with the increase of the water pressure flowing through the diverter bracket 100, or will not decrease significantly with the decrease of the water pressure flowing through the diverter bracket 100. Instead, as the water blocking member 130 moves, the total drainage volume (water flow rate = flow rate × area) of the diverter bracket 100 will fluctuate within a certain range, and there will be no sudden increase in drainage volume due to increased water pressure, thereby ensuring the stability of the water output and bringing a better experience to users.

[0086] The water pump 200 of the present invention refers to a device that has a pumping function on a fluid, and the pumped fluid is not limited to water.

[0087] The housing 110 includes an inlet pipe 210, an outlet pipe 220 and a main body 230, wherein the inlet pipe 210 and the outlet pipe 220 are both connected to the main body 230. The fluid enters the main body 230 through the inlet pipe 210, and is discharged from the outlet pipe 220 after being pressurized by the impeller 240.

[0088] The main body 230 accommodates the impeller 240, and the shaft 241 of the impeller 240 faces the fluid outlet of the water inlet pipe 210. When water flows in from the water inlet pipe 210, if there is no flow splitter bracket 100, it will directly impact the shaft 241 and the sleeve 242 of the impeller 240.

[0089] The flow splitter support 100 is at least partially disposed in the water inlet pipe 210 and located on the upstream side of the impeller 240. Figure 4-5 As shown, the upper half of the flow splitter bracket 100 is accommodated in the water inlet pipe 210, and the lower half is accommodated in the main body 230, thereby engaging with the impeller 240 and being located on the upstream side of the impeller 240. The volume size of the flow splitter bracket 100 accommodated in the water inlet pipe 210 is determined according to the location of the impeller 240 and the engagement method with the impeller 240.

[0090] The flow splitter support 100 disposed on the upstream side of the impeller 240 can prevent the shaft 241 and the sleeve 242 of the impeller 240 from being directly impacted.

[0091] After the fluid of the water pump 200 enters from the water inlet pipe 210, it first flows into the inner cavity 115 of the main body of the diverter bracket 100 through the water inlet 113 of the diverter bracket 100, and then flows out from the flow channel on the side of the diverter bracket 100 to avoid direct impact on the shaft 241 and the sleeve 242 of the impeller 240. In addition, when the fluid flows through the diverter bracket 100, the total displacement (water flow rate = flow velocity × area) of the diverter bracket 100 will remain in a certain range of fluctuations, and the displacement will not suddenly increase due to the increase in water pressure.

[0092] This embodiment also provides a water heater, which includes the water pump 200 as described above. The water pump 200 serves as a booster water pump 200 of the water heater, especially a gas water heater, to boost the water inlet of the water heater.

[0093] The inner cavity 115 of the diverter bracket 100 in the water pump 200 of the water heater converges from the first end 111 toward the second end 112, so that when the water blocking member 130 moves from the first end 111 toward the second end 112, the cross-sectional area of ​​the fluid channel 118 formed between the water blocking member 130 and the wall surface of the inner cavity 115 of the diverter bracket 100 gradually decreases. Therefore, when the water pressure flowing through the diverter bracket 100 is greater, although the flow rate of the drainage of the diverter bracket 100 increases, the drainage area decreases. When the water pressure flowing through the diverter bracket 100 decreases, although the diverter bracket 100 is smaller, the drainage area decreases. The flow rate of drainage of the diverter bracket 100 is reduced, but the drainage area is increased, so the total drainage volume will not increase significantly with the increase of water pressure flowing through the diverter bracket 100, or decrease significantly with the decrease of water pressure flowing through the diverter bracket 100. Instead, as the water blocking member 130 moves, the total drainage volume (water flow rate = flow rate × area) of the diverter bracket 100 will fluctuate within a certain range, and there will be no situation where the drainage volume suddenly increases due to the increase of water pressure and the water temperature of the water heater outlet water decreases, thereby ensuring the stability of the water outlet volume and water outlet temperature, and bringing a better experience to users.

[0094] It should be understood that the water pump 200 of the present invention can also be used in other devices besides water heaters to perform the function of fluid pressurization or delivery.

[0095] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0096] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A flow splitter bracket for a water pump, characterized in that: It includes: Shell, water blocking member and elastic member; The shell has a water inlet at a first end of the shell, a water outlet at a second end of the shell, and an inner cavity inside the shell, and the water inlet and the water outlet are both in communication with the inner cavity; The inner cavity is formed into a shape converging from the first end toward the second end, the water blocking member is arranged in the inner cavity and a fluid channel is formed between the water blocking member and the wall surface of the inner cavity; The elastic member biases the water blocking member in a direction causing the water blocking member to move from the second end toward the first end.

2. The flow diverter bracket for a water pump according to claim 1, characterized in that: A clamping portion is provided at the first end of the shell.

3. The flow diverter bracket for a water pump according to claim 2, characterized in that: The first end of the shell is provided with a plurality of partitions arranged at intervals in the circumferential direction, and the clamping part is arranged on the partitions.

4. The flow splitter bracket for a water pump according to claim 1, characterized in that: The inner cavity is formed in a truncated cone shape, and the water blocking member is formed in a disc shape.

5. The flow splitter bracket for a water pump according to claim 1, characterized in that: The second end of the housing is provided with a base; The base is provided with a water outlet, and the water outlet is connected with the inner cavity and the outer side of the shell.

6. The flow splitter bracket for a water pump according to claim 5, characterized in that: The water outlet is arranged on a surface of the base facing the shell.

7. The flow splitter bracket for a water pump according to claim 5, characterized in that: The base protrudes in an annular manner toward the outer peripheral side relative to the shell; The base protrudes in an annular manner toward the outer peripheral side relative to the housing.

8. The flow splitter bracket for a water pump according to claim 5, characterized in that: An avoidance groove is arranged on a surface of the base opposite to the shell.

9. A water pump, characterized in that: It includes: A housing, an impeller arranged inside the housing, and a flow splitter bracket for a water pump according to any one of claims 1 to 8; The housing comprises a water inlet pipe, and the flow splitter bracket is at least partially arranged in the water inlet pipe and located at the upstream side of the impeller.

10. A water heater, characterized in that: It comprises the water pump as claimed in claim 9.

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