Fan water pump assembly and water heater

Abstract

The invention discloses a fan water pump assembly and a water heater, and relates to the technical field of water heaters, the fan water pump assembly comprises a driving device, the driving device is at least provided with a first output end and a second output end, and the first output end and the second output end are configured to be capable of independently outputting power; the fan assembly comprises a wind wheel in driving connection with the first output end, and the driving device drives the wind wheel to rotate through the first output end; and the water pump assembly comprises a pump wheel in driving connection with the second output end, and the driving device drives the pump wheel to rotate through the second output end. According to the technical scheme, the fan and the water pump can be integrated and share one driving device, and when the driving device is applied to the water heater, the cost of the water heater can be reduced, the size of the water heater is reduced, and the assembling efficiency of the water heater is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water heaters, and particularly relates to a fan and water pump assembly and a water heater. BACKGROUND

[0002] In the related art, some water heaters contain both a fan and a water pump, and the fan and the water pump need to be respectively driven by a set of driving devices. For example, the fan and the water pump are respectively configured with a motor, and each motor needs to be correspondingly provided with a set of electric control systems, so that the cost of the water heater is high, and the two sets of driving devices need to occupy a large installation space inside the water heater, so that the size of the water heater is large, and the assembly efficiency of the water heater is also affected. SUMMARY

[0003] The main purpose of the present application is to provide a fan and water pump assembly and a water heater, which can integrate the fan and the water pump into one body and share a set of driving devices, so as to reduce the cost of the water heater, reduce the size of the water heater, and improve the assembly efficiency of the water heater when applied to the water heater.

[0004] To achieve the above purpose, the fan and water pump assembly provided by the present application comprises:

[0005] A driving device, the driving device has at least a first output end and a second output end, and the first output end and the second output end are configured to be able to independently output power to each other;

[0006] A fan assembly, the fan assembly comprises a fan wheel drivingly connected with the first output end, and the driving device drives the fan wheel to rotate through the first output end; and

[0007] A water pump assembly, the water pump assembly comprises a pump wheel drivingly connected with the second output end, and the driving device drives the pump wheel to rotate through the second output end.

[0008] In an embodiment, the driving device comprises a double-rotor motor and an electric control system electrically connected with the double-rotor motor, and the double-rotor motor comprises:

[0009] A first rotor, the first rotor is configured to form the first output end;

[0010] A second rotor, the second rotor is configured to form the second output end; and

[0011] A stator assembly, the stator assembly is configured to form a first magnetic circuit together with the first rotor to drive the first rotor and the fan wheel to rotate, and the stator assembly is configured to form a second magnetic circuit together with the second rotor to drive the second rotor and the pump wheel to rotate.

[0012] In one embodiment, the stator assembly includes a stator core sleeved around the periphery of the second rotor, and a winding coil wound around the stator core, the winding coil being electrically connected to the electronic control system, and the first rotor being sleeved around the periphery of the stator assembly.

[0013] In one embodiment, the stator core is provided with a plurality of stator slots along the circumferential direction, and the winding coil is wound in the plurality of stator slots. The number of magnetic poles of the first rotor is different from the number of magnetic poles of the second rotor, so that the pole-slot ratio of the first rotor to the stator core is different from the pole-slot ratio of the second rotor to the stator core.

[0014] In one embodiment, the dual-rotor motor further includes a shielding assembly, the shielding assembly including a shield, the stator assembly being sleeved around the shield, the first rotor being sleeved around the stator assembly and rotatably connected to the shield, and the second rotor being rotatably mounted inside the shield.

[0015] In one embodiment, the shielding cover has a first accommodating cavity and a first port communicating with the first accommodating cavity. A bearing is provided in the first accommodating cavity. The first rotor includes a rotor housing, a first magnetic ring, and a first rotating shaft. The rotor housing is sleeved on the periphery of the stator assembly. The first magnetic ring is fixed on the inner circumferential surface of the rotor housing and is disposed opposite to the stator assembly. One end of the first rotating shaft is connected to the bearing, and the other end extends out of the first port and is connected to the rotor housing. The impeller is connected to the rotor housing.

[0016] In one embodiment, the wind turbine and the rotor housing are integrally formed.

[0017] In one embodiment, the shielding cover further includes a second accommodating cavity and a second port communicating with the second accommodating cavity. The second rotor is rotatably mounted in the second accommodating cavity, and one end of the second rotor extends out of the second port and is connected to the pump wheel. The water pump assembly further includes a pump cover, which is disposed at the end of the shielding cover where the second port is located. The pump cover and the shielding cover together form a pump cavity for accommodating the pump wheel. The pump cover has an inlet and an outlet communicating with the pump cavity, respectively.

[0018] In one embodiment, a sealing element is provided between the pump cover and the shield, the sealing element being used to seal the mating parts of the pump cover and the shield.

[0019] In one embodiment, the shielding assembly further includes a fixed shaft, one end of which is connected to the pump cover, and the other end is inserted into the second accommodating cavity and connected to the shielding. The second rotor includes a bushing, a second rotating shaft, and a second magnetic ring, which are sequentially sleeved around the fixed shaft from the inside out. The end of the second rotating shaft facing the second port is connected to the pump wheel.

[0020] In one embodiment, the second rotating shaft and the pump wheel are integrally formed;

[0021] And / or, the bushing, the second rotating shaft, and the second magnetic ring are integrally formed by injection molding.

[0022] The present invention also proposes a water heater, comprising:

[0023] A flue system is used to circulate flue gas.

[0024] A heat exchanger, located in the flue system, is used for heat exchange with the flue gas within the flue system; and

[0025] A water system, connected to the heat exchanger; and

[0026] As described above, in the fan and pump assembly, the fan assembly is connected to the flue system and is used to drive airflow along the flue system, and the pump assembly is connected to the water system and is used to drive water flow along the water system.

[0027] The fan-pump assembly of this invention integrates the functions of both the fan and pump components into a single drive unit. The drive unit has at least a first output end connected to the impeller of the fan assembly and a second output end connected to the pump impeller of the pump assembly. The first and second output ends are configured to output power independently. Thus, when the drive unit is operating, the power output from the first output end is transmitted to the impeller to drive its rotation, enabling the fan assembly to operate normally; the power output from the second output end is transmitted to the pump impeller to drive its rotation, enabling the pump assembly to operate normally. Furthermore, the independent power output from the first and second output ends allows the impeller and pump impeller to operate independently, thus meeting different operating conditions. When this fan and pump assembly is applied to a water heater, only one drive unit is needed to perform both fan and pump functions, which reduces the cost of the water heater. Furthermore, the higher integration of the fan and pump assembly reduces the number of drive units, thus saving internal installation space and reducing the overall size of the water heater. During water heater assembly, the fan and pump assembly can be installed onto the water heater body in one go. Compared to traditional water heaters where the fan and pump need to be installed separately, this solution simplifies the installation process and improves assembly efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 An exploded structural diagram of an embodiment of the fan and water pump assembly provided by the present invention;

[0030] Figure 2 A cross-sectional structural schematic diagram of an embodiment of the fan and water pump assembly provided by the present invention;

[0031] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the central province after removing the wind turbine;

[0032] Figure 4 This is an exploded structural diagram of an embodiment of the first rotor provided by the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of an embodiment of the second rotor provided by the present invention;

[0034] Figure 6 This is a schematic diagram of a stator assembly according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of a structure of an embodiment of the shielding assembly provided by the present invention;

[0036] Figure 8 for Figure 7 A schematic diagram of the shielding cover from another perspective.

[0037] Explanation of icon numbers:

[0038] 101. First output end; 102. Second output end; 11. First rotor; 111. Rotor housing; 112. First magnetic ring; 113. First rotating shaft; 12. Second rotor; 121. Bushing; 122. Second rotating shaft; 123. Second magnetic ring; 13. Stator assembly; 131. Stator core; 132. Winding coil; 14. Shielding cover assembly; 141. Shielding cover; 1411. First accommodating cavity; 1412. Second accommodating cavity; 1413. Annular cavity; 141a. Body; 141b. Extension; 142. Fixed shaft; 15. Bearing; 16. Wave spring; 17. First retaining ring; 18. Second retaining ring; 19. Gasket; 21. Impeller; 31. Pump wheel; 32. Pump cover; 40. Seal.

[0039] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] In related technologies, some water heaters contain both a fan and a water pump, each requiring a separate drive unit. For example, the fan and water pump each have their own motor, and each motor requires a corresponding electrical control system. This increases the cost of the water heater, and the two drive units occupy a significant amount of internal installation space, resulting in a larger water heater size and impacting the overall assembly efficiency.

[0044] This invention proposes a fan and water pump assembly that integrates the fan and water pump into a single drive unit. When applied to water heaters, this assembly can reduce the cost and size of the water heater, and improve the assembly efficiency.

[0045] Please see Figures 1 to 3 In one embodiment of the present invention, the fan-pump assembly includes a drive device, a fan assembly, and a pump assembly. The drive device has at least a first output terminal 101 and a second output terminal 102, and the first output terminal 101 and the second output terminal 102 are configured to output power independently of each other. The fan assembly includes a fan wheel 21 that is driven to be connected to the first output terminal 101, and the drive device drives the fan wheel 21 to rotate via the first output terminal 101. The pump assembly includes a pump wheel 31 that is driven to be connected to the second output terminal 102, and the drive device drives the pump wheel 31 to rotate via the second output terminal 102.

[0046] In this embodiment, the drive device provides power to the fan assembly and the pump assembly. The drive device has a first output terminal 101 and a second output terminal 102. The first output terminal 101 is driven to the impeller 21, and the second output terminal 102 is driven to the pump impeller 31. The first output terminal 101 and the second output terminal 102 are configured to output power independently of each other; that is, the power output by the first output terminal 101 and the second output terminal 102 is independent and undisturbed. For example, the first output terminal 101 and the second output terminal 102 can output the same amount of power or different amounts of power; or, for example, the first output terminal 101 and the second output terminal 102 can output power simultaneously, or one of them can output power while the other does not operate. When the drive device is working, the power output by the first output terminal 101 is transmitted to the impeller 21 to drive the impeller 21 to rotate, thereby enabling the fan assembly to operate normally; the power output by the second output terminal 102 is transmitted to the pump impeller 31 to drive the pump impeller 31 to rotate, thereby enabling the pump assembly to operate normally. It is understandable that the power output from the first output terminal 101 and the second output terminal 102 is independent of each other, allowing the impeller 21 and the pump impeller 31 to operate independently. For example, the impeller 21 and the pump impeller 31 can rotate synchronously or asynchronously, or their rotational speeds can be the same or different. The drive device includes, but is not limited to, a dual-rotor single-stator motor, a dual-rotor dual-stator motor, or a single-rotor single-stator motor combined with other transmission mechanisms to form a drive mechanism with dual output terminals, as long as it enables independent torque output from the two output terminals of the drive device.

[0047] When this fan and pump assembly is used in a water heater, the fan assembly can be connected to the water heater's flue system to drive airflow along the flue system, and the pump assembly can be connected to the water heater's water system to drive water flow along the water system. For example, the water heater includes a burner, a combustion chamber housing, a heat exchanger, and a fume hood arranged sequentially. The heat exchanger is connected to an inlet pipe and an outlet pipe. The flue gas flow channel between the burner and the fume hood constitutes the flue system, and the inlet pipe is connected to the outlet pipe via the heat exchanger to constitute the water system. The fan assembly can be connected to either the inlet or outlet end of the flue system; the pump assembly can be connected in series with either the inlet or outlet pipe. For example, when this fan and pump assembly is applied to a forced-draft gas water heater, the air outlet of the fan assembly can be connected to the burner (i.e., the fan assembly is connected to the inlet end of the flue system). In this case, the fan assembly driven by the drive unit can function as a forced-draft fan. On one hand, it can drive the high-temperature flue gas generated by the burner combustion through the combustion chamber to the heat exchanger for heat exchange, and then drive the heat-exchanged flue gas to be collected by the fume hood and discharged outside the water heater. On the other hand, the fan assembly can also be used to deliver air into the burner to supplement the secondary air required for combustion. As another example, when this fan and pump assembly is applied to a forced-extraction gas water heater, the air inlet of the fan assembly can be connected to the fume hood (i.e., the fan assembly is connected to the outlet end of the flue system). In this case, the fan assembly driven by the drive unit can function as a forced-extraction fan, drawing the high-temperature flue gas generated by the burner combustion towards the fume hood, and finally discharging it outside the water heater through the air outlet of the fan assembly. The water pump assembly can be connected in series in the water system. The water pump assembly driven by the drive device can realize the function of water pressure increase and flow increase, and realize the function of water pump.

[0048] The fan-pump assembly of this invention integrates the functions of both the fan and pump components into a single drive unit. The drive unit has at least a first output end 101 connected to the impeller 21 of the fan assembly and a second output end 102 connected to the pump impeller 31 of the pump assembly. The first and second output ends 101 and 102 are configured to output power independently. When the drive unit is operating, the power output from the first output end 101 is transmitted to the impeller 21 to drive its rotation, enabling the fan assembly to operate normally. The power output from the second output end 102 is transmitted to the pump impeller 31 to drive its rotation, enabling the pump assembly to operate normally. Furthermore, the independent power output of the first and second output ends 101 allows the impeller 21 and pump impeller 31 to operate independently, thus meeting different operating conditions. When this fan and pump assembly is applied to a water heater, only one drive unit is needed to perform both fan and pump functions, which reduces the cost of the water heater. Furthermore, the higher integration of the fan and pump assembly reduces the number of drive units, thus saving internal installation space and reducing the overall size of the water heater. During water heater assembly, the fan and pump assembly can be installed onto the water heater body in one go. Compared to traditional water heaters where the fan and pump need to be installed separately, this solution simplifies the installation process and improves assembly efficiency.

[0049] Furthermore, the aforementioned fan and pump assembly allows the fan and pump to share a single drive unit. When cold water flows through the pump, it cools the drive unit, reducing temperature rise and extending its lifespan. Moreover, without changing the overall size of the water heater, this fan and pump assembly saves internal installation space by eliminating the need for a separate drive unit, freeing up more space for installing other expansion modules.

[0050] like Figures 1 to 3 As shown, in one embodiment, the drive device includes a dual-rotor motor and an electronic control system electrically connected to the dual-rotor motor. The dual-rotor motor includes a first rotor 11, a second rotor 12, and a stator assembly 13. The first rotor 11 forms a first output terminal 101, and the second rotor 12 forms a second output terminal 102. The stator assembly 13 and the first rotor 11 together form a first magnetic circuit to drive the first rotor 11 and the impeller 21 to rotate. The stator assembly 13 and the second rotor 12 together form a second magnetic circuit to drive the second rotor 12 and the pump wheel 31 to rotate.

[0051] In this embodiment, the driving device includes a dual-rotor motor and an electronic control system electrically connected to the dual-rotor motor. The two rotors of the dual-rotor motor respectively drive the impeller 21 and the pump impeller 31. Thus, only one electronic control system is needed to control the operation of the dual-rotor motor, which can drive the impeller 21 and the pump impeller 31 to rotate, thereby achieving the normal operation of the fan assembly and the water pump assembly. The arrangement of the first rotor 11, the second rotor 12, and the stator assembly 13 can be varied. For example, the first rotor 11 and the second rotor 12 can be arranged radially along the stator assembly 13, or axially along the stator assembly 13, etc. The stator assembly 13 and the first rotor 11 form a first magnetic circuit through an air gap. After the coil windings of the stator assembly 13 are energized, the magnetic field of the first magnetic circuit can drive the first rotor 11 to rotate, which in turn drives the impeller 21 to rotate. The stator assembly 13 and the second rotor 12 form a second magnetic circuit through an air gap. After the coil winding of the stator assembly 13 is energized, the second rotor 12 can be driven to rotate by the magnetic field of the second magnetic circuit, and then the pump wheel 31 is driven to rotate by the second rotor 12.

[0052] Furthermore, the first rotor 11 and the second rotor 12 of the dual-rotor motor can output torque independently. By selecting a certain pole-to-slot ratio between the first rotor 11 and the stator assembly 13, and between the second rotor 12 and the stator assembly 13, a single electronic control system can be used to achieve the same or different speeds for the impeller 21 and the pump impeller 31. For example, when the pole-to-slot ratio of the first rotor 11 to the stator assembly 13 is different from that of the second rotor 12 to the stator assembly 13, the impeller 21 and the pump impeller 31 can operate at different speeds. When their pole-to-slot ratios are the same, the impeller 21 and the pump impeller 31 can operate at the same speed. In addition, in this embodiment, the first rotor 11 and the second rotor 12 of the dual-rotor motor share a single stator assembly 13. Compared with a dual-stator dual-rotor motor, one stator is eliminated, resulting in a simpler overall structure, lower cost, and smaller size.

[0053] like Figure 3 and Figure 6 As shown, in one embodiment, the stator assembly 13 includes a stator core 131 sleeved around the second rotor 12, and a winding coil 132 wound around the stator core 131. The winding coil 132 is electrically connected to the electronic control system, and the first rotor 11 is sleeved around the stator assembly 13.

[0054] In this embodiment, the stator assembly 13 is generally arranged in a ring shape. The first rotor 11 is an outer rotor rotatably sleeved around the stator assembly 13, and the second rotor 12 is an inner rotor rotatably disposed within the inner cavity of the stator assembly 13. This arrangement allows the first rotor 11 and the second rotor 12 to be radially arranged along the stator assembly 13, resulting in a simple overall structure and reducing the axial dimensions of the dual-rotor motor. Furthermore, the first rotor 11 and the second rotor 12 are located on the inner and outer sides of the stator assembly 13, respectively, and are separated by the stator assembly 13, preventing mutual interference. The stator assembly 13 includes a stator core 131 and winding coils 132 wound around the stator core 131. The winding coils 132 are electrically connected to the electronic control system. When the winding coils 132 are energized, they generate a magnetic field, thereby driving the first rotor 11 and the second rotor 12 to rotate. The stator core 131 may include a stator iron core and an insulation system covering the surface of the stator iron core. The insulation system can separate the coil windings from the stator iron core to avoid scratching the coil windings or causing a short circuit. The insulation system can be implemented by spraying an insulating layer onto the surface of the stator iron core, or by assembling an insulating frame on the outside of the stator iron core.

[0055] Understandably, the stator core 131 has multiple stator slots along its circumference, and the coil windings are wound within these slots. The pole-to-slot ratio between the first rotor 11 and the stator assembly 13 is the ratio of the number of magnetic poles in the first rotor 11 to the number of stator slots, and the pole-to-slot ratio between the second rotor 12 and the stator assembly 13 is the ratio of the number of magnetic poles in the second rotor 12 to the number of stator slots. Considering that in practical applications, the impeller 21 and the pump impeller 31 generally require different speeds, optionally, the number of magnetic poles in the first rotor 11 is different from the number of magnetic poles in the second rotor 12. This makes the pole-to-slot ratio of the first rotor 11 to the stator core 131 different from the pole-to-slot ratio of the second rotor 12 to the stator core 131, thereby enabling the impeller 21 and the pump impeller 31 to operate at different speeds to meet different operating conditions.

[0056] like Figure 2 As shown, in one embodiment, the dual-rotor motor further includes a shield assembly 14, which includes a shield 141, a stator assembly 13 sleeved around the shield 141, a first rotor 11 sleeved around the stator assembly 13 and rotatably connected to the shield 141, and a second rotor 12 rotatably mounted inside the shield 141.

[0057] In this embodiment, the shield 141 serves as a mounting carrier for the stator assembly 13, the first rotor 11, and the second rotor 12, facilitating their installation. Furthermore, since the second rotor 12 needs to be connected to the pump impeller 31, some water will enter the second rotor 12 during pump assembly operation. By setting the shield 141, the second rotor 12 can be separated from the stator assembly 13, achieving a dry-wet isolation effect to prevent water from the pump assembly from entering the stator assembly 13, thus ensuring the safety of the dual-rotor motor.

[0058] To ensure the installation stability of the stator assembly 13, the stator assembly 13 and the shield 141 may optionally be fixed by potting (e.g., potting epoxy resin material) or BMC injection molding.

[0059] Please refer to Figure 3 , Figure 4 and Figure 8 To facilitate the installation of the first rotor 11, in one embodiment, the shield 141 is provided with a first receiving cavity 1411 and a first port communicating with the first receiving cavity 1411. The first receiving cavity 1411 is provided with a bearing 15. The first rotor 11 includes a rotor housing 111, a first magnetic ring 112 and a first rotating shaft 113. The rotor housing 111 is sleeved on the periphery of the stator assembly 13. The first magnetic ring 112 is fixed on the inner circumferential surface of the rotor housing 111 and is disposed opposite to the stator assembly 13. One end of the first rotating shaft 113 is connected to the bearing 15, and the other end extends out of the first port and is connected to the rotor housing 111. The impeller 21 is connected to the rotor housing 111.

[0060] In this embodiment, a first magnetic loop is formed between the first magnetic ring 112 and the stator assembly 13 through an air gap. When the dual-rotor motor is working, the magnetic field in the first magnetic loop drives the first magnetic ring 112 to rotate, which in turn drives the rotor housing 111 and the first rotating shaft 113 to rotate. The impeller 21 of the fan assembly is connected and fixed to the rotor housing 111 of the first rotor 11. The rotation of the rotor housing 111 drives the impeller 21 to rotate. During assembly, the first magnetic ring 112 can be fixed to the inner circumferential surface of the rotor housing 111 by means of adhesive or fastener connection. One end of the first rotating shaft 113 is connected to the bearing 15 in the first accommodating cavity 1411, and the other end of the first rotating shaft 113 can be connected and fixed to the rotor housing 111 by means of fastener connection or interference fit. The bearing 15 can provide stable support for the first rotor 11 to ensure the stability of the rotation of the first rotor 11. The impeller 21 and the rotor housing 111 can be integrally formed or can be separate structures that are then assembled and fixed.

[0061] Optionally, in one embodiment, the rotor housing 111 has an end plate and a side plate disposed around the periphery of the end plate and extending to one side. The side plate surrounds the periphery of the stator assembly 13. A first magnetic ring 112 is fixedly disposed on the inner circumferential surface of the side plate opposite to the stator assembly 13. The end plate is disposed opposite to the first port and has a through hole for the insertion of a first rotating shaft 113. The first rotating shaft 113 is interference-fitted with the through hole. To ensure the structural strength of the assembly of the first rotating shaft 113 and the through hole, the end plate may optionally have a flange extending axially around the periphery of the through hole. The flange surrounds the periphery of the first rotating shaft 113 to increase the contact area of ​​the interference fit with the first rotating shaft 113 and improve the structural strength of the rotor housing 111.

[0062] To further improve the rotational stability of the first rotor 11, optionally, such as Figure 3 As shown, in one embodiment, at least two bearings 15 are arranged axially along the first rotor 11 within the first accommodating cavity 1411. A first retaining ring 17 is provided between two adjacent bearings 15, and a second retaining ring 18 is provided on the outer end face of the outermost bearing 15. A wave spring 16 is provided between the innermost bearing 15 and the bottom wall of the first accommodating cavity 1411. The first rotating shaft 113 is simultaneously inserted into the inner rings of the multiple bearings 15. Thus, the multiple bearings 15 can provide stable support for the first rotating shaft 113, thereby ensuring the rotational stability of the first rotor 11. Optionally, the inner wall surface of the first accommodating cavity 1411 is provided with a first groove for receiving the outer edge of the first retaining ring 17. The outer peripheral surface of the first rotating shaft 113 is provided with a second groove for receiving the inner edge of the second retaining ring 18. This can further improve the installation reliability of the bearings 15 and prevent axial movement of the bearings 15.

[0063] Optionally, one end of the impeller 21 has a cavity, and the rotor housing 111 is at least partially housed within the cavity of the impeller 21. This allows for a tighter fit between the impeller 21 and the rotor housing 111, and also helps to reduce the axial dimension of the fan-pump assembly, thereby reducing the volume of the fan-pump assembly. Optionally, the rotor housing 111 and the impeller 21 are assembled by stamping to form an interference fit.

[0064] In one embodiment, the impeller 21 and the rotor housing 111 are integrally formed. For example, the impeller 21 and the rotor housing 111 can be integrally injection molded, which simplifies the installation structure of the impeller 21 and ensures the reliability of the connection between the impeller 21 and the rotor housing 111, thereby ensuring the stability of the impeller 21's operation. Of course, in other embodiments, the impeller 21 and the rotor housing 111 can also be assembled and fixed by means of snap-fit ​​connection, threaded connection, etc.

[0065] In one embodiment, the fan assembly further includes a volute, and the dual-rotor motor further includes a housing. The first rotor 11, the second rotor 12, and the stator assembly 13 are housed within the housing. The volute and the housing enclose a fan cavity, and the impeller 21 is disposed within the fan cavity. The volute also has an air inlet and an air outlet respectively communicating with the fan cavity. Thus, when the first rotor 11 drives the impeller 21 to rotate, a negative pressure is generated at the air inlet to draw external airflow into the fan cavity and then discharge it through the air outlet, thereby realizing the fan function.

[0066] like Figure 3 and Figure 7 As shown, in one embodiment, the shield 141 is further provided with a second accommodating cavity 1412 and a second port communicating with the second accommodating cavity 1412. The second rotor 12 is rotatably installed in the second accommodating cavity 1412. One end of the second rotor 12 extends out of the second port and is connected to the pump wheel 31. The water pump assembly also includes a pump cover 32. The pump cover 32 is provided at the end of the shield 141 where the second port is provided. The pump cover 32 and the shield 141 surround to form a pump cavity for accommodating the pump wheel 31. The pump cover 32 is provided with an inlet and an outlet communicating with the pump cavity respectively.

[0067] In this embodiment, the shield 141 and the pump cover 32 cooperate to form a pump chamber for accommodating the pump wheel 31. The pump chamber communicates with the second accommodating cavity 1412 of the shield 141 via the second port. This allows the second rotor 12, installed in the second accommodating cavity 1412, to be easily connected to the pump wheel 31. This structural design also facilitates the design of the second rotor 12 and the pump wheel 31 as an integral structure. When the second rotor 12 rotates, it drives the pump wheel 31 to rotate, allowing external liquid to be drawn into the pump chamber through the inlet and discharged through the outlet, thus realizing the water pump function.

[0068] To ensure the reliable sealing between the shielding cover 141 and the pump cover 32, such as Figure 3 As shown, in one embodiment, a sealing element 40 is provided between the pump cover 32 and the shield 141. The sealing element 40 is used to seal the mating parts of the pump cover 32 and the shield 141. In this way, water in the pump chamber can be prevented from leaking from the mating parts of the pump cover 32 and the shield 141 to the stator assembly 13 side, so as to ensure the safety of the dual rotor motor.

[0069] Optionally, in one embodiment, the shielding cover 141 has a positioning groove at one end near the second port for accommodating the open end of the pump cover 32. The positioning groove has a first positioning surface that abuts against the end face of the pump cover 32 and a second positioning surface that abuts against the inner circumferential surface of the pump cover 32. The inner circumferential surface of the pump cover 32 and the second positioning surface are sealed together by a sealing member 40. The sealing member 40 may include, but is not limited to, sealing rings, sealant, etc. Optionally, the inner circumferential surface of the pump cover 32 has a sealing groove, and the sealing member 40 is accommodated within the sealing groove.

[0070] Please refer to Figure 3 and Figure 5 To facilitate the installation of the second rotor 12, in one embodiment, the shielding assembly 14 further includes a fixed shaft 142. One end of the fixed shaft 142 is connected to the pump cover 32, and the other end is inserted into the second accommodating cavity 1412 and connected to the shielding cover 141. The second rotor 12 includes a bushing 121, a second rotating shaft 122, and a second magnetic ring 123, which are sequentially sleeved around the fixed shaft 142 from the inside out. One end of the second rotating shaft 122 facing the second port is connected to the pump wheel 31.

[0071] In this embodiment, the fixed shaft 142 remains fixed relative to the shield 141 and the pump cover 32. The bushing 121 is rotatably fitted around the fixed shaft 142. The second rotating shaft 122 is fixed around the bushing 121, and the second magnetic ring 123 is fixed around the second rotating shaft 122. The second magnetic ring 123 and the stator assembly 13 form a second magnetic circuit through an air gap. When the dual-rotor motor is working, the magnetic field in the second magnetic circuit drives the second magnetic ring 123 to rotate, which in turn drives the second rotating shaft 122 to rotate. The second rotating shaft 122 then drives the pump wheel 31 to rotate, thereby realizing the water pump function.

[0072] To facilitate the installation of the fixed shaft 142, the shield 141 and the pump cover 32 are optionally provided with corresponding insertion holes for the end of the fixed shaft 142 to be inserted. The fixed shaft 142 is interference-fitted with the insertion hole to ensure the installation stability of the fixed shaft 142.

[0073] In one embodiment, the second rotating shaft 122 and the pump wheel 31 are integrally formed. For example, the second rotating shaft 122 and the pump wheel 31 can be integrally injection molded, which simplifies the installation structure of the pump wheel 31 and ensures the reliability of the connection between the pump wheel 31 and the second rotating shaft 122, thereby ensuring the stability of the pump wheel 31's operation. Of course, in other embodiments, the pump wheel 31 and the second rotating shaft 122 can also be assembled and fixed by means of snap-fit ​​connection, threaded connection, etc. It is worth noting that when the pump wheel 31 is composed of multiple parts, the second rotating shaft 122 can be integrally formed with one part of the pump wheel 31. For example, the pump wheel 31 may include a first disc and a second bypass arranged opposite to each other and spaced apart, and blades disposed between the first disc and the second disc, wherein the second rotating shaft 122 can be integrally formed with the first disc.

[0074] To ensure the overall stability of the second rotor 12, the bushing 121, the second shaft 122, and the second magnetic ring 123 can optionally be injection molded into a single structure. It is understood that when the materials of the bushing 121, the second shaft 122, and the second magnetic ring 123 are different, they can be injection molded into a single unit using insert injection molding.

[0075] Optionally, the fixed shaft 142 is made of ceramic. This gives the fixed shaft 142 better wear resistance and corrosion resistance, and the water in the pump chamber entering the second accommodating cavity 1412 of the shield 141 will also lubricate the fixed shaft 142 to ensure the rotational stability of the second rotor 12.

[0076] Optionally, the bushing 121 is made of graphite. This gives the bushing 121 good wear resistance and corrosion resistance, and the water in the pump chamber entering the second accommodating cavity 1412 of the shield 141 will also lubricate the bushing 121 to ensure the rotational stability of the second rotor 12.

[0077] To prevent the bushing 121 from sliding along the axial direction of the fixed shaft 142, the fixed shaft 142 may optionally be provided with two shims 19 spaced apart along the axial direction, with the bushing 121 located between the two shims 19, thereby restricting the axial movement of the bushing 121.

[0078] Optionally, such as Figure 3 , Figure 7 and Figure 8 As shown, in one embodiment, the shield 141 includes a body 141a and an extension 141b. The body 141a is provided with a first accommodating cavity 1411 and a second accommodating cavity 1412. The extension 141b is located on the outer periphery of the second port. An annular cavity 1413 is formed between the extension 141b and the outer peripheral surface of the body 141a. The stator assembly 13 is sleeved on the periphery of the body 141a. One end of the stator assembly 13 near the second port is accommodated in the annular cavity 1413. The extension 141b and the pump cover 32 together enclose the pump cavity.

[0079] In this embodiment, the first accommodating cavity 1411 and the second accommodating cavity 1412 are arranged at intervals along the axial direction of the body 141a. The two ends of the body 141a are respectively provided with a first port and a second port. The extension portion 141b includes a first folded edge extending outward from the outer edge of the second port and a second folded edge extending towards the first port from the outer edge of the first folded edge. The gap between the second folded edge and the outer peripheral surface of the body 141a forms an annular cavity 1413. After the stator assembly 13 is fitted onto the outer periphery of the body 141a, one end of the stator assembly 13 can be accommodated in the annular cavity 1413 to provide positioning for the stator. The stator assembly 13 can also be fixed to the shielding cover 141 by potting glue in the annular cavity 1413. In order to ensure that the end face of the stator assembly 13 and the bottom wall of the annular cavity 1413 form a certain gap, optionally, the inner peripheral wall of the annular cavity 1413 is provided with a positioning step that abuts against the end face of the stator assembly 13 at the end facing the first port. The open end of the pump cover 32 abuts against the outer extension 141b of the shield 141, so that the pump cover 32 and the outer extension 141b enclose a pump cavity for accommodating the pump wheel 31. Optionally, a positioning groove is provided at the junction of the first and second folded edges of the outer extension 141b for accommodating the open end of the pump cover 32.

[0080] The present invention also proposes a water heater comprising a flue system, a heat exchanger, a water system, and a fan-pump assembly. The flue system is used for the circulation of flue gas; the heat exchanger is located in the flue system for exchanging heat with the flue gas within the flue system; the water system is connected to the heat exchanger; the fan-pump assembly includes a drive unit, a fan assembly, and a pump assembly. The drive unit has at least a first output end 101 and a second output end 102, configured to independently output power to each other; the fan assembly includes a fan wheel 21 drivenly connected to the first output end 101, and the drive unit drives the fan wheel 21 to rotate via the first output end 101; the pump assembly includes a pump wheel 31 drivenly connected to the second output end 102, and the drive unit drives the pump wheel 31 to rotate via the second output end 102. The fan assembly is connected to the flue system for driving airflow along the flue system, and the pump assembly is connected to the water system for driving water flow along the water system. The specific structure of the fan and pump assembly is as described in the above embodiments. Since this water heater adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. The water heater includes, but is not limited to, gas water heaters and wall-hung boilers. Gas water heaters include, but are not limited to, forced-draft gas water heaters and forced-extraction gas water heaters.

[0081] Taking a gas water heater as an example, the water heater includes a burner, a combustion chamber housing, a heat exchanger, and a fume hood arranged sequentially. The heat exchanger is connected to an inlet pipe and an outlet pipe. The flue gas flow channel between the burner and the fume hood constitutes the flue gas system, and the inlet pipe connects to the outlet pipe via the heat exchanger to form the outlet water system. The fan assembly can be connected to either the inlet or outlet end of the flue gas system; the water pump assembly can be connected in series with either the inlet or outlet pipe. For example, when this fan and pump assembly is applied to a forced-draft gas water heater, the air outlet of the fan assembly can be connected to the burner (i.e., the fan assembly is connected to the inlet end of the flue system). In this case, the fan assembly driven by the drive unit can function as a forced-draft fan. On one hand, it can drive the high-temperature flue gas generated by the burner combustion through the combustion chamber to the heat exchanger for heat exchange, and then drive the heat-exchanged flue gas to be collected by the fume hood and discharged outside the water heater. On the other hand, the fan assembly can also be used to deliver air into the burner to supplement the secondary air required for combustion. As another example, when this fan and pump assembly is applied to a forced-extraction gas water heater, the air inlet of the fan assembly can be connected to the fume hood (i.e., the fan assembly is connected to the outlet end of the flue system). In this case, the fan assembly driven by the drive unit can function as a forced-extraction fan, drawing the high-temperature flue gas generated by the burner combustion towards the fume hood, and finally discharging it outside the water heater through the air outlet of the fan assembly. The water pump assembly can be connected in series in the water system. The water pump assembly driven by the drive device can realize the function of water pressure increase and flow increase, and realize the function of water pump.

[0082] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A fan pump assembly, characterized by, The utility model relates to a double rotor motor and an electric control system electrically connected with the double rotor motor, and the double rotor motor comprises: a first rotor configured to form the first output end; a second rotor configured to form the second output end; and a stator assembly configured to form a first magnetic circuit with the first rotor to drive the first rotor and the fan wheel to rotate, and to form a second magnetic circuit with the second rotor to drive the second rotor and the pump wheel to rotate. The stator assembly comprises a stator core sleeved on the periphery of the second rotor, and a winding coil arranged around the stator core, wherein the winding coil is electrically connected with the electric control system, and the first rotor is sleeved on the periphery of the stator assembly.

2. The fan pump assembly of claim 1, wherein, The stator core is provided with a plurality of stator slots in the circumferential direction, and the winding coil is arranged in the plurality of stator slots, and the number of magnetic poles of the first rotor is different from the number of magnetic poles of the second rotor, so that the pole-slot ratio of the first rotor and the stator core is different from the pole-slot ratio of the second rotor and the stator core. The double rotor motor further comprises a shielding cover assembly, wherein the shielding cover assembly comprises a shielding cover, the stator assembly is sleeved on the periphery of the shielding cover, the first rotor is sleeved on the periphery of the stator assembly and is rotationally connected with the shielding cover, and the second rotor is rotatably installed in the shielding cover. The shielding cover is provided with a first accommodating cavity and a first port in communication with the first accommodating cavity, the first accommodating cavity is provided with a bearing, the first rotor comprises a rotor shell, a first magnetic ring and a first rotating shaft, the rotor shell is sleeved on the periphery of the stator assembly, the first magnetic ring is fixedly arranged on the inner circumferential surface of the rotor shell and is arranged opposite to the stator assembly, one end of the first rotating shaft is connected with the bearing, the other end of the first rotating shaft extends out of the first port and is connected with the rotor shell, and the fan wheel is connected with the rotor shell. The fan wheel and the rotor shell are integrally formed.

3. The fan pump assembly of claim 2, wherein, The shielding cover is further provided with a second accommodating cavity and a second port in communication with the second accommodating cavity, the second rotor is rotatably installed in the second accommodating cavity, one end of the second rotor extends out of the second port and is connected with the pump wheel, and the water pump assembly further comprises a pump cover, the pump cover is arranged at one end of the shielding cover provided with the second port, the pump cover and the shielding cover surround to form a pump cavity for accommodating the pump wheel, and the pump cover is provided with a liquid inlet and a liquid outlet in communication with the pump cavity, respectively.

4. The fan pump assembly of claim 3, wherein, ​ 5. The fan pump assembly of claim 3, wherein, ​ 6. The fan pump assembly of claim 5, wherein, ​ 7. The fan pump assembly of claim 6, wherein, ​ 8. The fan pump assembly of any one of claims 5-7, wherein, ​ 9. The fan pump assembly of claim 8, wherein, A sealing member is arranged between the pump cover and the shield cover to seal the joint between the pump cover and the shield cover.

10. The fan pump assembly of claim 8, wherein, The shield cover assembly further comprises a fixed shaft, one end of the fixed shaft is connected with the pump cover, the other end of the fixed shaft is inserted into the second accommodating cavity and connected with the shield cover, the second rotor comprises a shaft sleeve, a second rotating shaft and a second magnetic ring which are sequentially arranged from inside to outside around the fixed shaft, one end of the second rotating shaft towards the second port is connected with the pump wheel.

11. The fan pump assembly of claim 10, wherein, The second rotating shaft and the pump wheel are integrally formed. And / or, the shaft sleeve, the second rotating shaft and the second magnetic ring are integrally formed by injection molding.

12. A water heater, characterized by Comprise: A flue system for passing flue gas flow; A heat exchanger arranged in the flue system for exchanging heat with the flue gas in the flue system; And A water system in communication with the heat exchanger; And The fan pump assembly of any one of claims 1 to 11, the fan assembly is in communication with the flue system for driving air flow along the flue system, the water pump assembly is in communication with the water system for driving water flow along the water system.

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