Rotor, water pump and gas water heater

Abstract

The utility model belongs to the technical field of liquid supercharging devices, and particularly discloses a rotor, a water pump and a gas water heater, the rotor comprises an impeller structure and a rotor cover, the impeller structure comprises a rotor base body and a plurality of blades, and one side of the rotor base body along the extension direction of the central axis of the rotor base body is provided with a setting surface; the multiple blades are arranged on the arrangement face at intervals around the central axis, the blades are bent to form concave side faces facing the central axis, the blades are provided with opposite water inlet ends and water outlet ends, the water inlet ends are close to the central axis, the water outlet ends are close to the edge of the arrangement face, and the connecting line of the water inlet ends and the central axis and the connecting line of the water outlet ends and the central axis form an included angle theta 1 which is larger than or equal to 120 degrees and smaller than or equal to 155 degrees. The rotor cover is connected to the side, away from the arrangement face, of the blade, the rotor cover is provided with a first water inlet, a first water outlet is formed among the rotor cover, the water outlet end and the arrangement face, and when the rotor rotates at a high speed, water is ejected from the first water outlet and then has small impact force on the external structure in the radial direction of the rotor.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid pressure boosting device technical field especially relates to a rotor, water pump and gas water heater. BACKGROUND

[0002] As Figure 1 Shown, in gas water heater, need to use water pump 100' to carry out pressure boosting to the water of input gas water heater, wherein, the higher the operating speed of rotor 1' of water pump 100' is, the stronger the water pumping capacity of water pump 100' is, but the stronger centrifugal force that water obtains along the radial direction of rotor 1'. Water pump 100' in the related art when rotor 1' high-speed operation, water between the adjacent two blades 111' of rotor 1' and after impacting on blade 111', will flow towards the water outlet of rotor 1' under the action of blade 111' and eject from the water outlet, and the impact force that water ejects from the water outlet of rotor 1' and hits water pump housing 2' is larger, and then the vibration of water pump 100' as a whole is larger, so that the noise, vibration of gas water heater as a whole is larger when using.

[0003] Among them, Figure 1 The water flow path in water pump 100' in the prior art is exemplarily shown by dashed line and arrow. SUMMARY

[0004] One of the technical problems solved by the utility model is to provide a rotor, which can effectively solve the problem of excessive impact of water ejected from the water outlet of the rotor on the external structure in high-speed rotation of the rotor.

[0005] The second technical problem solved by the utility model is to provide a water pump, which can effectively solve the problem of excessive vibration of the water pump in high-speed rotation of the rotor.

[0006] The third technical problem solved by the utility model is to provide a gas water heater, which can effectively solve the problem of excessive noise and vibration of the gas water heater when in use.

[0007] The first technical problem is solved by the following technical scheme:

[0008] A rotor for pressurizing liquid, the rotor comprising:

[0009] A rotor structure comprises a rotor base having a setting surface along one side of the extension direction of a central axis thereof, and a plurality of blades arranged at intervals around the central axis on the setting surface, the blades being curved with the concave side facing the central axis, the blades having opposite water inlet ends and water outlet ends, the water inlet ends being close to the central axis, the water outlet ends being close to the edges of the setting surface, the line connecting the water inlet end and the central axis and the line connecting the water outlet end and the central axis forming an angle θ1, 120°≤θ1≤155°; and

[0010] A rotor cover is connected to the side of the blades away from the setting surface, the rotor cover being provided with a first water inlet, the center of the first water inlet being located on the central axis, the rotor cover, the water outlet end and the setting surface forming a first water outlet.

[0011] Compared with the background art, the rotor has the following beneficial effects:

[0012] By making the blades curved into the shape with the concave side facing the central axis, and making the angle θ1 between the line connecting the water inlet end and the central axis and the line connecting the water outlet end and the central axis satisfy 120°≤θ1≤155°, in other words, making the angle of the water inlet end and the water outlet end along the direction around the central axis larger, so that the inclination angle of the line connecting the water inlet end and the water outlet end relative to the line connecting the water inlet end and the central axis is larger, thus, after the water enters between the adjacent two blades from the water outlet end and hits the concave side of the blade, at least part of the water can hit the concave side of the blade again near the water outlet end, and then is ejected from the first water outlet of the rotor, since the water has a part of kinetic energy along the radial direction of the rotor during the process of the second impact, the flow direction of the water is closer to the tangent direction of the outer periphery of the setting surface, so that the impact force of at least part of the water ejected from the first water outlet along the radial direction of the rotor on the external structure can be reduced when the rotor rotates at high speed.

[0013] In one embodiment, the distance between the water inlet end and the central axis is R1, the distance between the water outlet end and the central axis is R2, and 2.3≤R2 / R1≤2.7.

[0014] In one embodiment, the tangent line of the extension direction of the concave side at the water inlet end and the line connecting the water inlet end and the central axis form an angle θ2, the tangent line of the extension direction of the concave side at the water outlet end and the line connecting the water inlet end and the central axis form an angle θ3, and θ2>θ3.

[0015] In one of the embodiments, a tangent of an extension direction of the concave side surface at the water inlet end and a line connecting the water inlet end and the central axis forms an angle θ2, a tangent of an extension direction of the concave side surface at the water outlet end and the line connecting the water inlet end and the central axis forms an angle θ3, 75°≤θ2≤85°, and / or, 60°≤θ3≤70°.

[0016] In one of the embodiments, a distance R1 of the water inlet end from the central axis and a radius R3 of the first water inlet satisfy: R1

[0017] In one of the embodiments, 0.75≤R1 / R3≤0.9.

[0018] In one of the embodiments, the impeller structure comprises n blades, n≥6.

[0019] In one of the embodiments, the blade has a thickness d in a direction perpendicular to the concave side surface;

[0020] The thickness d of the blade at a portion of the blade between the water inlet end and the water outlet end is greater than the thickness d of the water inlet end and the water outlet end, or the thickness d of the blade gradually increases from the water inlet end to the water outlet end.

[0021] The second technical problem is solved by the following technical solution:

[0022] A water pump comprises a water pump housing and a rotor as described in the foregoing technical solution, the water pump housing has a pump cavity, an outer surface of the water pump housing is provided with a second water inlet and a second water outlet which are respectively communicated with the pump cavity, the rotor is rotatably arranged in the pump cavity, the first water inlet of the rotor cover is communicated with the second water inlet, and the first water outlet of the rotor is communicated with the second water outlet through the pump cavity.

[0023] Compared with the background art, the water pump has the beneficial effects that:

[0024] Since the water ejected from the first water outlet of the rotor has a small impact force on the external structure in the radial direction of the rotor, the impact force of the water on the cavity wall of the pump cavity is small, so that the vibration of the water pump housing is small when the rotor rotates at a high speed, and the vibration of the water pump as a whole is small.

[0025] The third technical problem is solved by the following technical solution:

[0026] A gas water heater, comprising: a water heater shell, a water inlet pipe, a water outlet pipe and a water pump as described in the preceding technical solution, the water inlet pipe and the water outlet pipe are arranged in the water heater shell at one end, the water pump is arranged in the water heater shell, and the second water inlet of the water pump is communicated with the water inlet pipe, and the second water outlet of the water pump is communicated with the water outlet pipe.

[0027] The gas water heater has the beneficial effects compared with the background art:

[0028] Since the vibration of the water pump is small when the rotating shaft rotates at high speed, the noise and vibration generated by the gas water heater during use are small. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a sectional view of the structure of the water pump in the related art;

[0030] Figure 2 It is a pressure simulation schematic diagram of the pump cavity when the water pump in the related art is in operation;

[0031] Figure 3 It is a three-dimensional structure schematic diagram of the rotor provided by the embodiment of the utility model;

[0032] Figure 4 It is a structure schematic diagram of the rotor (when the rotor cover is viewed along the extension direction of the central axis) provided by the embodiment of the utility model;

[0033] Figure 5 It is a three-dimensional structure schematic diagram of the impeller structure provided by the embodiment of the utility model;

[0034] Figure 6 It is a structure schematic diagram of the impeller structure (when the setting surface is viewed) provided by the embodiment of the utility model;

[0035] Figure 7 It is a three-dimensional structure schematic diagram of the water pump provided by the embodiment of the utility model;

[0036] Figure 8 It is a sectional view schematic diagram of the structure of the water pump provided by the embodiment of the utility model under the three-dimensional perspective;

[0037] Figure 9 It is a sectional view schematic diagram of the structure of the water pump provided by the embodiment of the utility model;

[0038] Figure 10 It is a pressure simulation schematic diagram of the pump cavity when the water pump provided by the embodiment of the utility model is in operation;

[0039] REFERENCE SIGNS:

[0040] Figure 1 WithFigure 2 In the present application,

[0041] 100', water pump;

[0042] 1', rotor; 111', blade;

[0043] 2', water pump housing; 21', pump cavity.

[0044] Figures 3 to 10 In the present application,

[0045] 100, water pump;

[0046] 1, rotor; 11, impeller structure; 110, rotor base; 1101, central axis; 1102, setting surface; 111, blade; 1110, water inlet end; 1111, water outlet end; 1112, concave side surface; 12, rotor cover; 120, first water inlet; 13, first water outlet;

[0047] 2, water pump housing; 21, pump cavity; 22, second water inlet; 23, second water outlet; 24, limiting column; 25, bearing. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0050] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0051] In the description of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be connected inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0052] As Figures 3 to 6 shown, the embodiment proposes a rotor 1 for pressurizing liquid, the rotor 1 comprising an impeller structure 11 and a rotor cover 12, the impeller structure 11 comprising a rotor base 110 and a plurality of blades 111, the rotor base 110 having a setting surface 1102 on one side along the extension direction of its own central axis 1101, the plurality of blades 111 being arranged on the setting surface 1102 at intervals around the central axis 1101, the blade 111 being curved, and the concave side 1112 formed by the curvature of the blade 111 facing the central axis 1101, the blade 111 having opposite water inlet end 1110 and water outlet end 1111, the water inlet end 1110 being close to the central axis 1101, the water outlet end 1111 being close to the edge of the setting surface 1102, the line connecting the water inlet end 1110 and the central axis 1101 and the line connecting the water outlet end 1111 and the central axis 1101 forming an angle θ1, 120°≤θ1≤155°, the rotor cover 12 being connected to the side of the blade 111 away from the setting surface 1102, the rotor cover 12 being provided with a first water inlet 120, the center of the first water inlet 120 being located on the central axis 1101, the rotor cover 12, the water outlet end 1111 and the setting surface 1102 forming a first water outlet 13.

[0053] By bending the blade 111 into a shape with the concave side 1112 facing the central axis 1101, and by making the included angle θ1 between the line connecting the water inlet end 1110 of the blade 111 and the central axis 1101 and the line connecting the water outlet end 1111 and the central axis 1101 satisfy 120°≤θ1≤155°, in other words, by making the angle by which the water inlet end 1110 and the water outlet end 1111 of the blade 111 are offset in the direction around the central axis 1101 larger, so that the inclination angle of the line connecting the water inlet end 1110 and the water outlet end 1111 of the blade 111 relative to the line connecting the water inlet end 1110 and the central axis 1101 larger, after the water enters between the two adjacent blades 111 from the water outlet end 1111 and hits the concave side 1112 of the blade 111, at least part of the water can hit the concave side 1112 of the blade 111 again near the water outlet end 1111, and then be ejected from the first water outlet 13 of the rotor 1. Due to the process of the second impact, part of the kinetic energy of the water along the radial direction of the rotor 1 can be absorbed by the blade 111, and the flow direction of the water can be made closer to the tangential direction of the outer periphery of the setting surface 1102, so that the impact force of at least part of the water ejected from the first water outlet 13 along the radial direction of the rotor 1 (i.e., the direction perpendicular to the central axis 1101) on the external structure can be reduced. As shown in Figure 6 , Figure 6 The flow path of the water in the water pump 100 provided by the present embodiment is exemplarily shown by the dashed lines and arrows.

[0054] Please also refer to Figures 4 to 6 , the distance between the water inlet end 1110 and the central axis 1101 is R1, and the distance between the water outlet end 1111 and the central axis 1101 is R2. The larger the ratio R2 / R1 of the distance R2 to the distance R1, the smaller the inclination angle of the line connecting the water inlet end 1110 and the water outlet end 1111 of the blade 111 relative to the line connecting the water inlet end 1110 and the central axis 1101, so that the less water can hit the blade 111 again after the water enters between the two adjacent blades 111 from the water outlet end 1111 and hits the blade 111. When the rotor 1 rotates at a high speed, the overall impact force of the water ejected from the first water outlet 13 along the radial direction of the rotor 1 on the external structure is larger. Therefore, R2 / R1 should be smaller, but the smaller R2 / R1 is, the smaller the amount of water that can be accommodated between the two adjacent blades 111, and the smaller the water pressurization efficiency of the rotor 1. Therefore, R2 / R1 cannot be too small. Based on this, in an embodiment, the ratio R2 / R1 of the distance R1 between the water inlet end 1110 and the central axis 1101 to the distance R2 between the water outlet end 1111 and the central axis 1101 can satisfy 2.3≤R2 / R1≤2.7, for example, R2 / R1 can be 2.3, 2.35, 2.4, 2.45, 2.5, 2.55, 2.6, 2.65, or 2.7, etc.

[0055] The tangent of the extension direction of the concave side surface 1112 at the water inlet end 1110 and the line connecting the water inlet end 1110 and the central axis 1101 forms an included angle θ2, and the tangent of the extension direction of the concave side surface 1112 at the water outlet end 1111 and the line connecting the water inlet end 1110 and the central axis 1101 forms an included angle θ3. In order to make the curved shape of the concave side surface 1112 suitable for causing water to achieve secondary impact or even more impact on the blade 111, the curved radius of the concave side surface 1112 gradually increases from the water inlet end 1110 to the water outlet end 1111, so that in an embodiment, θ2> θ3.

[0056] Since the greater the included angle θ2 is close to 90°, the greater the curvature of the concave side surface 1112 is, the more water can achieve secondary impact or even more impact on the blade 111, and the better the kinetic energy absorption effect of water along the radial direction of the rotor 1 is. However, if the included angle θ2 is too close to 90°, the water inlet end 1110 will have a poor guiding effect on the water flow in the direction around the central axis 1101, which will further cause the water flow speed between adjacent blades 111 to be slower and the water pressurization efficiency of the rotor 1 to be poorer when the rotation speed of the rotor 1 is unchanged. Therefore, the included angle θ2 cannot be too close to 90°. Based on this, in an embodiment, the included angle θ2 can satisfy: 75°≤ θ2≤ 85°, for example, the included angle θ2 can be 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84° or 85°, etc.

[0057] Since the greater the included angle θ3 is close to 90°, the greater the curvature of the concave side surface 1112 is, the more water can achieve secondary impact or even more impact on the blade 111, and the smaller the kinetic energy of water along the radial direction of the rotor 1 when the water flows out of the water outlet end 1111. However, in order to make the curvature of the concave side surface 1112 at the water outlet end 1111 and the water inlet end 1110 more reasonable, the included angle θ3 cannot be too large. Based on this, in an embodiment, the included angle θ3 can satisfy: 60°≤ θ3≤ 70°, for example, the included angle θ3 can be 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69° or 70°, etc.

[0058] Preferably, the included angle θ2 can satisfy: 75°≤ θ2≤ 85°, and the included angle θ3 can satisfy: 60°≤ θ3≤ 70°, so that the shape of the concave side surface 1112 is more suitable for causing more water to achieve secondary impact or even more impact on the blade 111.

[0059] In an embodiment, the distance R1 between the water inlet end 1110 and the middle axis 1101 and the radius R3 of the first water inlet 120 satisfy: R1 < R3, so that the projection of the water inlet end 1110 on the rotor cover 12 in the extension direction of the middle axis 1101 is within the range of the first water inlet 120, and thus when water enters the adjacent two blades 111 from the first water inlet 120, part of the water enters in a direction perpendicular to the middle axis 1101, and part of the water enters in the extension direction of the middle axis 1101, so that compared with the technical solution in which water can only enter between the two blades 111 in a direction perpendicular to the middle axis 1101, the effective water inlet area formed between the two blades 111 in this embodiment is larger, and can be suitable for allowing a larger flow of water to quickly enter between the two blades 111, in other words, the resistance of the water when entering between the two blades 111 can be reduced, so as to effectively improve the working efficiency of the rotor 1.

[0060] The smaller the ratio R1 / R3 between the distance R1 between the water inlet end 1110 and the middle axis 1101 and the radius R3 of the first water inlet 120 is than 1, the larger the effective water inlet area formed between the two blades 111 is, but the larger the amount of water entering between the two blades 111 in the extension direction of the middle axis 1101 is, so that the amount of water that needs to be diverted near the water inlet end 1110 to continue to flow to the water outlet end 1111 of the blade 111 is larger, which may cause the energy loss of the water at the water inlet end 1110 to increase, and the water pressurizing efficiency of the rotor 1 to decrease, and the closer the ratio R1 / R3 is to 1, the smaller the effective water inlet area formed between the two blades 111 is, so that the resistance of the water when entering between the two blades 111 is larger, therefore, the ratio R1 / R3 needs to be smaller than 1 but cannot be too small than 1, based on which, in an embodiment, the ratio R1 / R3 between the distance R1 between the water inlet end 1110 and the middle axis 1101 and the radius R3 of the first water inlet 120 can satisfy: 0.75 ≤ R1 / R3 ≤ 0.9, for example, R1 / R3 can be 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89 or 0.9, etc.

[0061] The impeller structure 11 includes n blades 111, and the larger n is, the smaller the impact force of the water that a single blade 111 bears when the rotor 1 operates at the same speed, and thus the smaller the vibration of the blade 111 when the rotor 1 rotates, based on which, in an embodiment, the number n of blades 111 included in the impeller structure 11 can satisfy: n ≥ 6, for example, n can be 6, 7, 8, 9, 10, 11 or a larger value.

[0062] In one embodiment, all blades 111 are identical in shape and equidistant from each other, so that when the rotor 1 rotates, all blades 111 are subjected to more even force, which can reduce the overall vibration amplitude of the rotor 1.

[0063] Along the direction perpendicular to the concave side 1112, the blade 111 has a thickness d. Since the space for each blade 111 at the water inlet 1110 is relatively compact, the thickness d of the water inlet 1110 is usually small in order to avoid the water inlet 1110 occupying too much of the opening area of ​​the first water inlet 120 and causing low water intake efficiency of the rotor 1. However, at the location where the blade 111 may be hit by water once, twice or more (i.e., the part of the blade 111 located between the water inlet 1110 and the water outlet 1111), the space for the blade 111 is more spacious, and the structural stability of the blade 111 needs to be better. Therefore, the thickness d of the part of the blade 111 located between the water inlet 1110 and the water outlet 1111 can be larger. Based on this, in one embodiment, the thickness d of the part of the blade 111 located between the water inlet 1110 and the water outlet 1111 is greater than the thickness d of the water inlet 1110.

[0064] Furthermore, in one embodiment, the thickness d of the portion of the blades 111 located between the inlet end 1110 and the outlet end 1111 is greater than the thickness d of the outlet end 1111, thereby enabling the opening area of ​​the first outlet 13 to be larger, so as to make the water discharge efficiency of the rotor 1 higher.

[0065] In another embodiment, the thickness d of the blade 111 gradually increases from the water inlet end 1110 to the water outlet end 1111, thereby making the structure of the water outlet end 1111 stronger and the structure of the water outlet end 1111 more stable, and thus making the ejection angle of water ejected from the first water outlet 13 more stable.

[0066] like Figures 7 to 9 As shown, this embodiment proposes a water pump 100, including: a water pump housing 2 and a rotor 1 as described in the aforementioned technical solution. The water pump housing 2 has a pump chamber 21. The outer surface of the water pump housing 2 is provided with a second water inlet 22 and a second water outlet 23 respectively connected to the pump chamber 21. The rotor 1 is rotatably disposed in the pump chamber 21. The first water inlet 120 of the rotor cover 12 is connected to the second water inlet 22. The first water outlet 13 of the rotor 1 is connected to the second water outlet 23 through the pump chamber 21. Since the water ejected from the first water outlet 13 of the rotor 1 has a smaller impact force on the external structure along the radial direction of the rotor 1, the impact force of the water on the cavity wall of the pump chamber 21 is smaller, so that the vibration generated by the water pump housing 2 is smaller when the rotor 1 rotates at high speed, and thus the vibration generated by the water pump 100 as a whole is smaller.

[0067] In one embodiment, for example, a limiting post 24 may be provided inside the pump chamber 21 of the pump housing 2. A bearing 25 is sleeved on the outer periphery of the limiting post 24, and the impeller structure 11 of the rotor 1 may be sleeved on the outer periphery of the bearing 25, so that the rotor 1 can be rotatably disposed inside the pump chamber 21. In other embodiments, the rotor 1 may also be rotatably disposed inside the pump chamber 21 by any other arrangement method in the prior art, which will not be described in detail in this embodiment.

[0068] In one embodiment, the surface of the rotor cover 12 with the first water inlet 120 is positioned close to the cavity wall of the pump chamber 21, so that the distance between the first water inlet 120 and the second water inlet 22 is small. This results in less water flowing directly into the pump chamber 21 through the gap between the first water inlet 120 and the second water inlet 22 after flowing into the pump housing 2 from the second water inlet 22, thereby improving the water pressurization efficiency of the pump 100. In addition, by preventing the rotor cover 12 from directly contacting the cavity wall of the pump chamber 21, friction between the rotor cover 12 and the cavity wall of the pump chamber 21 can be avoided when the rotor 1 rotates relative to the pump housing 2, thus avoiding additional wear of parts and energy loss.

[0069] Specifically, please combine Figure 1 and Figure 2 As shown, when the water pump 100' in the prior art operates with an inlet flow rate of 0.84 m / s at the second inlet 22', simulation analysis shows that the maximum pressure near the wall of the pump chamber 21' can reach 98177.7 Pa.

[0070] And please combine Figures 7 to 10 As shown, in this scheme, the water pump 100 has the same rotor speed as the rotor 1 in the prior art, so that the water flow velocity at the second inlet 22 is also 0.84 m / s. Through simulation, it can be calculated and analyzed that the maximum pressure near the cavity wall of the pump cavity 21 is 64397.9 Pa, and the pressure reduction effect at the cavity wall of the pump cavity 21 is significant.

[0071] This embodiment also proposes a gas water heater, including: a water heater shell, an inlet pipe, an outlet pipe, and a water pump 100 as described in the aforementioned technical solution (see 7). Both the inlet pipe and the outlet pipe are located inside the water heater shell at one end. The water pump 100 is located inside the water heater shell, and the second inlet 22 (see 8) of the water pump 100 is connected to the inlet pipe, and the second outlet 23 (see 9) of the water pump 100 is connected to the outlet pipe. Since the vibration generated by the aforementioned water pump 100 when the shaft rotates at high speed is small, the overall noise and vibration generated by the gas water heater during use are small.

[0072] In the specific contents of the foregoing specific embodiments, each technical feature can be combined arbitrarily without contradiction, and to make the description brief, all possible combinations of the foregoing technical features are not described, however, as long as the combinations of the technical features do not exist contradiction, it should be considered that it is within the scope of the description.

[0073] The specific contents of the foregoing specific embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A rotor for pressurizing a liquid, characterized by The rotor (1) comprises: a blade structure (11) comprising a rotor base (110) having a setting surface (1102) on one side along the extension direction of a self mid-axis (1101), and a plurality of blades (111) arranged on the setting surface (1102) at intervals around the mid-axis (1101), the blades (111) being curved, the concave side (1112) of the blades (111) being curved towards the mid-axis (1101), the blades (111) having opposite water inlet ends (1110) and water outlet ends (1111), the water inlet ends (1110) being close to the mid-axis (1101), the water outlet ends (1111) being close to the edges of the setting surface (1102), the line connecting the water inlet ends (1110) and the mid-axis (1101) and the line connecting the water outlet ends (1111) and the mid-axis (1101) forming an angle θ1, 120°≤θ1≤155°; and a rotor cover (12) connected to the side of the blades (111) away from the setting surface (1102), the rotor cover (12) being provided with a first water inlet (120), the center of the first water inlet (120) being located on the mid-axis (1101), the rotor cover (12), the water outlet ends (1111) and the setting surface (1102) forming a first water outlet (13).

2. The rotor of claim 1, wherein The distance between the water inlet ends (1110) and the mid-axis (1101) is R1, the distance between the water outlet ends (1111) and the mid-axis (1101) is R2, 2.3≤R2 / R1≤2.

7.

3. The rotor of claim 1, wherein The tangent of the extension direction of the concave side (1112) at the water inlet ends (1110) and the line connecting the water inlet ends (1110) and the mid-axis (1101) form an angle θ2, the tangent of the extension direction of the concave side (1112) at the water outlet ends (1111) and the line connecting the water inlet ends (1110) and the mid-axis (1101) form an angle θ3, θ2>θ3.

4. The rotor of claim 1, wherein The tangent of the extension direction of the concave side (1112) at the water inlet ends (1110) and the line connecting the water inlet ends (1110) and the mid-axis (1101) form an angle θ2, the tangent of the extension direction of the concave side (1112) at the water outlet ends (1111) and the line connecting the water inlet ends (1110) and the mid-axis (1101) form an angle θ3, 75°≤θ2≤85°, and / or, 60°≤θ3≤70°.

5. A rotor according to any one of claims 1-4, characterised in that The distance R1 between the water inlet ends (1110) and the mid-axis (1101) and the radius R3 of the first water inlet (120) satisfy: R1 6. The rotor of claim 5, wherein 0.75≤R1 / R3≤0.

9.

7. A rotor according to any one of claims 1-4, characterised in that The blade structure (11) comprises n blades (111), n≥6.

8. A rotor according to any one of claims 1-4, characterised in that In the direction perpendicular to the concave side (1112), the blades (111) have a thickness d; The thickness d of the vane (111) between the water inlet end (1110) and the water outlet end (1111) is greater than the thickness d of the water inlet end (1110) and the water outlet end (1111), or the thickness d of the vane (111) gradually increases from the water inlet end (1110) to the water outlet end (1111).

9. A water pump characterized by comprising: The water pump (100) comprises: The water pump (100) is arranged in the water heater housing, and the second water inlet (22) of the water pump (100) is communicated with the water inlet pipe, and the second water outlet (23) of the water pump (100) is communicated with the water outlet pipe.

10. A gas water heater, characterised by, The water pump (100) is arranged in the water heater housing, and the second water inlet (22) of the water pump (100) is communicated with the water inlet pipe, and the second water outlet (23) of the water pump (100) is communicated with the water outlet pipe. ​

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