Water pump and water heater comprising same

Abstract

The water pump comprises a pump shell, an impeller assembly, a water inlet and a water outlet, the impeller assembly comprises an impeller ring and blades, the impeller ring is arranged between the blades and the pump shell, the inner wall of the pump shell is provided with a first leakage blocking part, and the side, facing the inner wall of the pump shell, of the impeller ring is provided with a second leakage blocking part. The first leakage stopping part and the second leakage stopping part are matched in a concave-convex mode, a gap is formed between the first leakage stopping part and the second leakage stopping part to form a leakage stopping cavity, and the leakage stopping cavity is used for increasing the stroke and resistance of water flow thrown out by the blades flowing back to the water inlet. After water flow is sucked in by the impeller assembly and thrown out by the blades, if the water flow flows back into the impeller assembly through a gap between the pump shell and the impeller ring, the stroke and resistance of water flow backflow are increased due to the fact that the first leakage blocking part and the second leakage blocking part form a leakage blocking cavity, and the sealing structure is low in manufacturing precision requirement and has a good sealing effect; and the drainage efficiency of the water pump is improved.

Description

Technical Field

[0001] The utility model relates to a water pump and a water heater comprising the same. Background Art

[0002] Currently, water pumps are widely used in water heaters, especially booster water pumps. The impeller rotates and causes a pressure difference between the water inlet and the water outlet of the water pump. Water flows in from the water inlet of the water pump, and is thrown out from the water outlet after centrifugal rotation of the impeller. However, due to the problem of manufacturing precision, there is a gap between the pump casing and the impeller of the water pump. Therefore, part of the water thrown out from the impeller will return to the suction port of the impeller through the gap between the pump casing and the impeller, and mix with the water entering the impeller, thereby affecting the efficiency of the water pump. If the backflow of water inside the water pump is to be avoided by reducing the gap between the pump casing and the impeller, the requirements for manufacturing precision and the cost are relatively high. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defect of the prior art that due to the gap between the pump casing and the impeller, part of the water flow thrown out from the impeller will return to the suction port of the impeller through the gap between the pump casing and the impeller, mix with the water entering the impeller, thereby affecting the efficiency of the water pump, and provide a water pump and a water heater including the same.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A water pump comprises a pump casing, an impeller assembly, a water inlet and a water outlet, the impeller assembly comprises an impeller ring and blades, the impeller ring is arranged between the blades and the pump casing, the inner wall of the pump casing is provided with a first leakage-proof portion, the side of the impeller ring facing the inner wall of the pump casing is provided with a second leakage-proof portion, the first leakage-proof portion and the second leakage-proof portion are matched in a concave-convex manner, and a gap is provided between the first leakage-proof portion and the second leakage-proof portion to form a leakage-proof cavity, the leakage-proof cavity is used to increase the stroke and resistance of the water flow thrown out by the blades flowing back to the water inlet.

[0006] In the present scheme, the above-mentioned structural form is adopted, by arranging a first leakage-proof part on the pump casing, and arranging a second leakage-proof part on the impeller ring to match the gap with the first leakage-proof part, and a gap is provided between the first leakage-proof part and the second leakage-proof part to form a leakage-proof cavity. After the water flow is sucked into the impeller assembly and thrown out by the blades, if it wants to flow back into the impeller assembly through the gap between the pump casing and the impeller ring, the leakage-proof cavity formed by the concave-convex matching of the first leakage-proof part and the second leakage-proof part increases the stroke and resistance of the water flow reflux. This sealing structure has low precision requirements and has a good sealing effect, thereby improving the discharge efficiency of the water pump.

[0007] Preferably, the side of the impeller ring facing the inner wall of the pump casing is the upper end surface of the impeller ring;

[0008] The first leakage-proof part is an annular protrusion extending from the inner wall of the pump housing to the upper end surface of the impeller ring, and the second leakage-proof part is an annular groove extending from the upper end surface of the impeller ring to the inner wall of the pump housing, and the first leakage-proof part and the second leakage-proof part cooperate to form a "J"-shaped leakage-proof cavity; or,

[0009] The first leakage-proof part is an annular groove extending from the inner wall of the pump casing toward the upper end face of the impeller ring, and the second leakage-proof part is an annular protrusion extending from the upper end face of the impeller ring toward the inner wall of the pump casing. The first leakage-proof part and the second leakage-proof part cooperate to form a "J"-shaped leakage-proof cavity.

[0010] In the present scheme, the above-mentioned structural form is adopted, and the structure in which the annular protrusion and the annular groove cooperate greatly increases the distance of water flowing through the leakage-proof cavity. When the water flows through the first leakage-proof part and the second leakage-proof part, the concave and convex cooperate to form a "J"-shaped leakage-proof cavity, it will encounter a longer flow channel and a sharper turn, which has a better sealing effect, and the structure is simple and easy to manufacture.

[0011] Preferably, the gap between the first leakage-blocking portion and the second leakage-blocking portion comprises a transverse gap, the direction of the transverse gap is parallel to the radial direction of the impeller ring, and the size of the transverse gap ranges from 1 mm to 5 mm; and / or,

[0012] The gap between the first leakage-blocking portion and the second leakage-blocking portion comprises a longitudinal gap, the direction of the longitudinal gap is parallel to the axial direction of the impeller ring, and the size range of the longitudinal gap is less than or equal to 3 mm.

[0013] In this solution, the above-mentioned structural form is adopted, the range of the lateral gap is 1mm to 5mm, and the range of the longitudinal gap is less than or equal to 3mm, which reduces the high requirements for precision during manufacturing, makes manufacturing simpler, and has a better sealing effect within this range.

[0014] Preferably, the number of the first leakage-blocking part is at least one, the number of the second leakage-blocking part is at least one, and the number of the first leakage-blocking part and the second leakage-blocking part correspond to each other and their positions are opposite to each other.

[0015] In the present solution, the above-mentioned structural form is adopted, and more first leakage-proof parts and more second leakage-proof parts can be set on the inner wall of the pump casing and the upper end surface of the impeller ring. The number of the first leakage-proof parts and the second leakage-proof parts corresponds to each other and their positions are opposite to each other to form more leakage-proof cavities. The multi-layer structure has a better sealing effect on the water flow.

[0016] Preferably, a side arm of the annular groove away from the axis of the impeller ring is a first side arm, a side arm of the annular groove close to the axis of the impeller ring is a second side arm, the annular protrusion extends a third leakage-blocking portion toward the first side arm or the second side arm, and the first side arm or the second side arm extends a fourth leakage-blocking portion toward the annular protrusion.

[0017] In this solution, the above-mentioned structural form is adopted, the third leakage-blocking part is arranged on the annular protrusion, and the fourth leakage-blocking part is arranged on the annular groove, so that the water flow encounters more right-angle turns in the process of passing through the leakage-blocking cavity, and the resistance is greater, so the sealing effect is better;

[0018] Preferably, the number of the third leakage-blocking part and the number of the fourth leakage-blocking part are both at least one, the number of the third leakage-blocking part and the fourth leakage-blocking part correspond to each other and their positions are opposite to each other, and the third leakage-blocking part and the fourth leakage-blocking part are arranged at the same horizontal position; or,

[0019] The number of the third leakage-blocking part and the number of the fourth leakage-blocking part are both at least one, and the third leakage-blocking part and the fourth leakage-blocking part are alternately arranged along the axial direction of the impeller ring.

[0020] In this solution, the above-mentioned structural form is adopted, and a plurality of third leakage-blocking parts and fourth leakage-blocking parts are provided to form a layered structure to block the water flow, thereby achieving a better sealing effect.

[0021] Preferably, the third leakage-blocking portion is arranged on a side of the annular protrusion close to the groove bottom of the annular groove, and the fourth leakage-blocking portion is arranged on a side of the annular groove away from the groove bottom of the annular groove.

[0022] In this solution, the above-mentioned structural form is adopted, and the third leakage-proof part is arranged on the side of the annular protrusion close to the bottom of the annular groove, and the fourth leakage-proof part is arranged on the side of the annular groove away from the bottom of the annular groove. The structure is compact and has a better blocking effect on water flow passing through.

[0023] Preferably, a side arm of the annular groove away from the axis of the impeller ring is a first side arm, a side arm of the annular groove close to the axis of the impeller ring is a second side arm, the first side arm extends a connecting portion toward the second side arm along the radial direction of the impeller ring, and a cross section of the connecting portion and the first side arm along the circumferential direction of the impeller ring is in a "T" shape; and / or,

[0024] The first side arm has a notch along the circumferential direction of the impeller ring, the annular protrusion extends a fifth leakage-blocking portion toward the notch, and the cross-section of the fifth leakage-blocking portion and the annular protrusion along the circumferential direction of the impeller ring is in a "T" shape.

[0025] In the present scheme, the above-mentioned structural form is adopted, the cross-section of the connecting part and the first side arm along the circumferential direction of the impeller ring is in a "T" shape, and the cross-section of the fifth leakage-blocking part and the annular protrusion along the circumferential direction of the impeller ring is in a "T" shape. The two cooperate with each other, which increases the stroke of the water flow along the circumferential direction of the impeller ring, has a better blocking effect on the water flow, and thus a better sealing effect, and the cooperation between the two makes the assembly simpler and quicker.

[0026] Preferably, the impeller ring is prepared using a cast iron process; and / or,

[0027] The first leakage-blocking portion and the pump housing are integrally formed; and / or,

[0028] The second leakage-blocking portion and the impeller ring are integrally formed.

[0029] In this solution, the above structure is adopted, and the wear resistance of cast iron is better. The impeller ring is inevitably worn out during long-term use. This material does not require frequent replacement of the impeller ring. The first leakage-blocking part and the pump housing are integrally formed, and the second leakage-blocking part and the impeller ring are integrally formed, which has better structural strength and sealing effect.

[0030] The utility model also provides a water heater, comprising the water pump as described above.

[0031] The positive and progressive effects of the utility model are:

[0032] The utility model provides a first leakage-proof part on the pump casing, and a second leakage-proof part on the impeller ring which is gap-matched with the first leakage-proof part, a gap is provided between the first leakage-proof part and the second leakage-proof part to form a leakage-proof cavity, after the water flow is sucked into the impeller assembly and thrown out by the blades, if it wants to flow back into the impeller assembly through the gap between the pump casing and the impeller ring, the leakage-proof cavity formed by the concave-convex cooperation of the first leakage-proof part and the second leakage-proof part increases the stroke and resistance of the water flow backflow, this sealing structure has low precision requirements, has good sealing effect, and improves the discharge efficiency of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the water pump according to the first embodiment of the utility model.

[0034] Figure 2 This is a schematic diagram of the top structure of the water pump of Example 1 of the utility model.

[0035] Figure 3 for Figure 2 Cross-sectional view along AA direction.

[0036] Figure 4 for Figure 3 A partial enlarged view of part B.

[0037] Figure 5 This is a schematic diagram of the three-dimensional structure of the impeller ring of the water pump of Example 1 of the utility model (I).

[0038] Figure 6 This is a schematic diagram of the three-dimensional structure of the impeller ring of the water pump of the first embodiment of the utility model (II).

[0039] Figure 7 It is a schematic diagram of the three-dimensional structure of the pump casing of the water pump according to the first embodiment of the utility model.

[0040] Figure 8 It is a schematic diagram of the three-dimensional structure of the water pump of the second embodiment of the utility model.

[0041] Fig. 9 for Figure 8 Cross-sectional view along CC direction.

[0042] Fig.10 for Fig. 9 A partial enlarged view of part D.

[0043] Fig.11 It is a schematic diagram of the three-dimensional structure of the impeller ring of the water pump of the second embodiment of the utility model.

[0044] Fig.12 This is a schematic diagram of the three-dimensional structure of the water pump of the third embodiment of the utility model.

[0045] Fig.13 for Fig.12 Cross-sectional view along EE direction.

[0046] Fig.14 It is a schematic diagram of the three-dimensional structure of the impeller ring of the water pump of the third embodiment of the utility model.

[0047] Fig.15 It is a schematic diagram of the three-dimensional structure of the pump casing of the water pump of the third embodiment of the utility model.

[0048] Description of reference numerals:

[0049] Pump housing 1

[0050] The first leakage blocking portion 11

[0051] The third leakage blocking portion 111

[0052] Fifth leakage blocking unit 112

[0053] Impeller assembly 2

[0054] Impeller ring 21

[0055] The second leakage blocking portion 211

[0056] First side arm 2111

[0057] Second side arm 2112

[0058] Fourth leakage blocking part 2113

[0059] Connection 2114

[0060] Gap 2115

[0061] Impeller ring upper end surface 212

[0062] Arc groove 213

[0063] Blade 22

[0064] Leakage-proof chamber 3

[0065] Water inlet 4

[0066] Water outlet 5

[0067] Gap 31

[0068] Horizontal gap 311

[0069] Longitudinal gap 312

[0070] Dimension of lateral clearance L1

[0071] The size of the longitudinal gap L2 DETAILED DESCRIPTION

[0072] Three preferred embodiments are given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0073] Embodiment 1

[0074] like Figure 1-Figure 7 As shown, this embodiment provides a water pump, which includes a pump casing 1, an impeller assembly 2, a water inlet 4 and a water outlet 5. The impeller assembly 2 includes an impeller ring 21 and blades 22. The impeller ring 21 is arranged between the blades 22 and the pump casing 1. The inner wall of the pump casing 1 is provided with a first leakage-proof portion 11, and the side of the impeller ring 21 facing the inner wall of the pump casing 1 is provided with a second leakage-proof portion 211. The first leakage-proof portion 11 and the second leakage-proof portion 211 are matched in a concave-convex manner, and a gap is provided between the first leakage-proof portion 11 and the second leakage-proof portion 211 to form a leakage-proof cavity 3. The leakage-proof cavity 3 is used to increase the stroke and resistance of the water flow thrown out by the blades 22 and flowing back to the water inlet 4.

[0075] In this way, by providing a first leakage prevention portion 11 on the pump housing 1 and a second leakage prevention portion 211 which is in clearance fit with the first leakage prevention portion 11 on the impeller ring 21, a clearance is provided between the first leakage prevention portion 11 and the second leakage prevention portion 211 to form a leakage prevention cavity 3. After water flows into the impeller assembly 2 from the water inlet 4, the impeller rotates at a high speed, and the water flow is driven by the blades 22 and thrown out of the impeller by centrifugal force. The outflowing water flow has a high speed. If part of the water flow thrown out from the blades 22 flows back into the impeller assembly 2 through the clearance between the pump housing 1 and the impeller ring 21, the leakage prevention cavity 3 formed by the first leakage prevention portion 11 and the second leakage prevention portion 211 increases the return stroke and resistance of the water flow; similarly, after the water flow enters from the water inlet 4, if it does not pass through the blades 22 but leaks to the water outlet 5 through the clearance between the pump housing 1 and the impeller ring 21, it will also encounter great resistance and require a longer stroke. This kind of sealing structure has a lower requirement for precision and has a better sealing effect, improving the liquid discharge efficiency of the water pump.

[0076] In this embodiment, as Figure 4 shown, the side of the impeller ring 21 facing the inner wall of the pump housing 1 is the upper end face 212 of the impeller ring; the first leakage prevention portion 11 is an annular protrusion extending from the inner wall of the pump housing 1 towards the upper end face 212 of the impeller ring, and the second leakage prevention portion 211 is an annular groove extending from the upper end face 212 of the impeller ring towards the inner wall of the pump housing 1. The first leakage prevention portion 11 and the second leakage prevention portion 211 are in concave-convex fit to form a "ji"-shaped leakage prevention cavity 3; of course, in other embodiments, the first leakage prevention portion may also be an annular groove extending from the inner wall of the pump housing 1 towards the upper end face 212 of the impeller ring, and the second leakage prevention portion is an annular protrusion extending from the upper end face 212 of the impeller ring towards the inner wall of the pump housing 1. The first leakage prevention portion and the second leakage prevention portion are also in concave-convex fit to form a "ji"-shaped leakage prevention cavity.

[0077] The structure of the cooperation between the annular protrusion and the annular groove greatly increases the stroke of the water flow when passing through the leakage prevention cavity 3. When the water flow passes through the "ji"-shaped leakage prevention cavity 3 formed by the concave-convex fit of the first leakage prevention portion 11 and the second leakage prevention portion 211, it will encounter a longer flow path and a sharper turn, having a better sealing effect, and this kind of structure is simple and convenient to manufacture.

[0078] As Figure 4As shown, the gap 31 between the first leakage-blocking part 11 and the second leakage-blocking part 211 includes a transverse gap 311 and a longitudinal gap 312. The direction of the transverse gap 311 is parallel to the radial direction of the impeller ring 21, and the size L1 of the transverse gap 311 is controlled in the range of 1mm to 5mm. Specifically, in this embodiment, the size L1 of the transverse gap 311 is 2mm. The direction of the longitudinal gap 312 is parallel to the axial direction of the impeller ring 21, and the size L2 of the longitudinal gap 312 is less than or equal to 3mm. Specifically, in this embodiment, the size L2 of the longitudinal gap 312 is 3mm. By setting the size L1 of the transverse gap 311 in the range of 1mm to 5mm and the size L2 of the longitudinal gap 312 in the range of less than or equal to 3mm, the high requirements for precision during manufacturing are reduced, the manufacturing is simpler, and a better sealing effect is achieved within this range.

[0079] In this embodiment, the number of the first leakage-blocking part 11 is one, and the number of the second leakage-blocking part 211 is one; of course, in other embodiments, the number of the first leakage-blocking part 11 and the second leakage-blocking part 211 can be more than one, and the number of the first leakage-blocking part 11 and the second leakage-blocking part 211 corresponds to each other and their positions are opposite to each other, so that a leakage-blocking cavity 3 with a longer stroke and greater resistance can be formed, and the multi-layer leakage-blocking structure has a better sealing effect on water flow. At the same time, Figure 6 As shown, in this embodiment, arc grooves 213 are distributed at intervals in the circumferential direction on the lower surface of the impeller ring 21, and the upper edge of the blade 22 can be embedded in the arc groove 213. The upper edge of the blade 22 can be embedded in the arc grooves 213 distributed at intervals in the circumferential direction on the lower surface of the impeller ring 21, so the blade 22 and the impeller ring 21 have a better matching effect and a compact structure.

[0080] In this embodiment, the impeller ring 21 is prepared using a cast iron process, and the first leakage-blocking portion 11 and the pump housing 1 are integrally formed, and the second leakage-blocking portion 211 and the impeller ring 21 are integrally formed. Selecting the cast iron process to prepare the impeller ring 21 makes the impeller ring 21 more resistant to wear. The impeller ring 21 is inevitably subject to wear during long-term use, and this process does not require frequent replacement of the impeller ring 21. The first leakage-blocking portion 11 and the pump housing 1 are integrally formed, and the second leakage-blocking portion 211 and the impeller ring 21 are integrally formed, which have better structural strength and sealing effect.

[0081] This embodiment also provides a water heater, which includes a water pump as described above. The water pump of the water heater is provided with a first leakage-proof part on the pump housing, and a second leakage-proof part which is gap-matched with the first leakage-proof part on the impeller ring. A gap is provided between the first leakage-proof part and the second leakage-proof part to form a leakage-proof cavity. After the water flow is sucked into the impeller assembly and thrown out by the blades, if it is to flow back into the impeller assembly through the gap between the pump housing and the impeller ring, the leakage-proof cavity formed by the first leakage-proof part and the second leakage-proof part increases the stroke and resistance of the water flow backflow. This sealing structure has low precision requirements and has a good sealing effect, thereby improving the drainage efficiency of the water pump.

[0082] Embodiment 2

[0083] like Figure 8-Figure 11 As shown, the overall structure of the water pump of this embodiment is basically the same as that of the embodiment 1, except that the side arm of the annular groove away from the axis of the impeller ring 21 is the first side arm 2111, and the side arm of the annular groove close to the axis of the impeller ring 21 is the second side arm 2112. The annular protrusion extends the third leakage-blocking portion 111 in the direction close to the first side arm 2111 or the second side arm 2112, and the first side arm 2111 or the second side arm 2112 extends the fourth leakage-blocking portion 2113 in the direction close to the annular protrusion. The third leakage-blocking part 111 is arranged on the annular protrusion, and the fourth leakage-blocking part 2113 is arranged on the annular groove, so that the water flow encounters more right-angle turns in the process of passing through the leakage-blocking cavity 3, and the resistance is greater, so the sealing effect is better; in this embodiment, the number of the third leakage-blocking part 111 and the fourth leakage-blocking part 2113 are both two, and the third leakage-blocking part 111 and the fourth leakage-blocking part 2113 are staggered along the axial direction of the impeller ring 21, and the third leakage-blocking part 111 can be arranged on the side of the annular protrusion close to the bottom of the annular groove, and the fourth leakage-blocking part 2113 is correspondingly arranged on the side of the annular groove away from the bottom of the annular groove. Of course, in other embodiments, the number of the third leakage-blocking part 111 and the fourth leakage-blocking part 2113 can be more or less, and the positions of the third leakage-blocking part 111 and the fourth leakage-blocking part 2113 can be arranged at the same horizontal position or staggered, and a plurality of third leakage-blocking parts 111 and fourth leakage-blocking parts 2113 are arranged to form a layered structure of blocking the water flow, so as to achieve a better sealing effect. This arrangement makes the structure between the leakage-blocking parts more compact and has a better blocking effect on water flow. In this embodiment, the third leakage-blocking part 111 and the annular protrusion are integrally formed, and the fourth leakage-blocking part 2113 and the annular groove are integrally formed. The integrally formed structure improves manufacturing efficiency.

[0084] This embodiment also provides a water heater, which includes the water pump as described above.

[0085] Embodiment 3

[0086] like Figure 12-Figure 15As shown, the overall structure of the water pump of this embodiment is basically the same as that of the embodiment 1, except that the side arm of the annular groove away from the axis of the impeller ring 21 is the first side arm 2111, and the side arm of the annular groove close to the axis of the impeller ring 21 is the second side arm 2112. The first side arm 2111 extends a connecting portion 2114 toward the second side arm 2112 along the radial direction of the impeller ring 21, and the cross section of the connecting portion 2114 and the first side arm 2111 along the circumferential direction of the impeller ring 21 is in a "T" shape; the first side arm 2111 is provided with a notch 2115 along the circumferential direction of the impeller ring 21, and the annular protrusion extends a fifth leakage-blocking portion 112 in the direction of the notch 2115, and the cross section of the fifth leakage-blocking portion 112 and the annular protrusion along the circumferential direction of the impeller ring 21 is in a "T" shape. The two cooperate with each other to increase the stroke of the water flow along the circumferential direction of the impeller ring 21, which has a better blocking effect on the water flow, and thus a better sealing effect, and the two cooperate with each other to make assembly simpler and faster. In this embodiment, the connecting portion 2114 and the first side arm 2111 are integrally formed, and the fifth leakage-blocking portion 112 and the annular protrusion are integrally formed, and the integrally formed structure improves manufacturing efficiency.

[0087] This embodiment also provides a water heater, which includes the water pump as described above.

[0088] It should be noted that the water pumps and water heaters including the same in other embodiments may also include the structures in Embodiment 3 and Embodiment 2 based on Embodiment 1.

[0089] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] 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 appended 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 all fall within the protection scope of the utility model.

Claims

1. A water pump, comprising a pump casing, an impeller assembly, a water inlet and a water outlet, characterized in that: The impeller assembly includes an impeller ring and blades, the impeller ring is arranged between the blades and the pump casing, the inner wall of the pump casing is provided with a first leakage-proof portion, and the side of the impeller ring facing the inner wall of the pump casing is provided with a second leakage-proof portion, the first leakage-proof portion and the second leakage-proof portion are matched in a concave-convex manner, and a gap is provided between the first leakage-proof portion and the second leakage-proof portion to form a leakage-proof cavity, and the leakage-proof cavity is used to increase the stroke and resistance of the water flow thrown out by the blades flowing back to the water inlet.

2. The water pump according to claim 1, characterized in that The side of the impeller ring facing the inner wall of the pump casing is the upper end surface of the impeller ring; The first leakage-proof part is an annular protrusion extending from the inner wall of the pump housing to the upper end face of the impeller ring, and the second leakage-proof part is an annular groove extending from the upper end face of the impeller ring to the inner wall of the pump housing, and the first leakage-proof part and the second leakage-proof part cooperate to form a "J"-shaped leakage-proof cavity; or, The first leakage-proof part is an annular groove extending from the inner wall of the pump casing toward the upper end face of the impeller ring, and the second leakage-proof part is an annular protrusion extending from the upper end face of the impeller ring toward the inner wall of the pump casing. The first leakage-proof part and the second leakage-proof part cooperate to form a "J"-shaped leakage-proof cavity.

3. The water pump according to claim 2, characterized in that: The gap between the first leakage-blocking portion and the second leakage-blocking portion comprises a transverse gap, the direction of the transverse gap is parallel to the radial direction of the impeller ring, and the size of the transverse gap ranges from 1 mm to 5 mm; and / or, The gap between the first leakage-blocking portion and the second leakage-blocking portion includes a longitudinal gap, the direction of the longitudinal gap is parallel to the axial direction of the impeller ring, and the size range of the longitudinal gap is less than or equal to 3 mm.

4. The water pump according to claim 2, characterized in that: The number of the first leakage-blocking part is at least one, the number of the second leakage-blocking part is at least one, and the number of the first leakage-blocking part and the second leakage-blocking part correspond to each other and their positions are opposite to each other.

5. The water pump according to claim 2, characterized in that: A side arm of the annular groove away from the axis of the impeller ring is a first side arm, a side arm of the annular groove close to the axis of the impeller ring is a second side arm, the annular protrusion extends a third leakage-blocking portion toward the first side arm or the second side arm, and the first side arm or the second side arm extends a fourth leakage-blocking portion toward the annular protrusion.

6. The water pump according to claim 5, characterized in that The number of the third leakage-blocking part and the number of the fourth leakage-blocking part are both at least one, the number of the third leakage-blocking part and the fourth leakage-blocking part correspond to each other and their positions are opposite to each other, and the third leakage-blocking part and the fourth leakage-blocking part are arranged at the same horizontal position; or, The number of the third leakage-blocking part and the number of the fourth leakage-blocking part are both at least one, and the third leakage-blocking part and the fourth leakage-blocking part are alternately arranged along the axial direction of the impeller ring.

7. The water pump according to claim 5, characterized in that The third leakage-blocking portion is arranged on a side of the annular protrusion close to the groove bottom of the annular groove, and the fourth leakage-blocking portion is arranged on a side of the annular groove away from the groove bottom of the annular groove.

8. The water pump according to claim 2, characterized in that: A side arm of the annular groove away from the axis of the impeller ring is a first side arm, and a side arm of the annular groove close to the axis of the impeller ring is a second side arm, the first side arm extends a connecting portion toward the second side arm along the radial direction of the impeller ring, and a cross section of the connecting portion and the first side arm along the circumferential direction of the impeller ring is in a "T" shape; and / or, The first side arm has a notch along the circumferential direction of the impeller ring, the annular protrusion extends a fifth leakage-blocking portion toward the notch, and the cross-section of the fifth leakage-blocking portion and the annular protrusion along the circumferential direction of the impeller ring is in a "T" shape.

9. The water pump according to claim 1, characterized in that: The impeller ring is prepared by using a cast iron process; and / or, The first leakage-blocking portion and the pump housing are integrally formed; and / or, The second leakage-blocking portion and the impeller ring are integrally formed.

10. A water heater, characterized in that: Comprising a water pump as claimed in any one of claims 1 to 9.

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