Hot water pump

Abstract

The invention discloses a hot water pump which comprises a pump shell, a first impeller, a second impeller, an inner magnetic assembly, a first flow channel, a second flow channel, a second flow channel, a second flow channel and a third flow channel, the pump shell is provided with a pump cavity and a cover cavity, and the pump cavity is internally provided with a first impeller and an inner magnetic assembly; the rotating shaft is rotationally arranged on the pump shell, a first impeller and an inner magnetic assembly are arranged on the rotating shaft, a second flow channel penetrating through the rotating shaft in the axial direction is formed in the rotating shaft, and liquid in the cover cavity can flow to the pump cavity through the second flow channel; the outer magnetic assembly is arranged on the outer side of the pump shell and connected with the rotary driving source, and the outer magnetic assembly is matched with the inner magnetic assembly; one end of the first pipeline is communicated with the pump outlet, and the other end is communicated with the cover cavity; one end of the second pipeline communicates with the cover cavity, and the other end communicates with the first pipeline; and the switch structure is located in the cover cavity and arranged at the inlet end of the second flow channel, and the switch structure responds to the temperature change of the liquid in the cover cavity so that the second flow channel can be switched between the circulation state and the cut-off state.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pump equipment, and particularly relates to a hot water pump. BACKGROUND

[0002] The hot water pump for conveying hot medium is widely used in the industries of metallurgy, power, light textile, petroleum, chemical industry, chemical fertilizer, pharmaceutical, papermaking, environmental protection, rubber, heat collecting, waste heat utilization and the like. Since the hot water pump conveys high-temperature medium, the medium temperature is generally 120-150 DEG C, and the high-temperature medium transfers heat to the pump system in the pumping process, which causes the temperature of the whole pump to rise, and changes the working environment of each component of the pump, and has certain influence on the safe operation of the pump.

[0003] In the prior art, the forced cooling mode is generally adopted, that is, the bearing assembly and the sealing assembly of the pump are cooled by external cooling water, so as to achieve the purpose of cooling and lubrication. However, the forced cooling mode needs external cooling water, generally tap water, and then another pump needs to be additionally arranged to pump the tap water into the hot water pump, so that the pipeline structure is relatively complex, and since the temperature of the external cooling water is greatly different from that of the high-temperature medium conveyed by the hot water pump, the external cooling water can reduce the temperature of the high-temperature medium of the hot water pump, and cause energy loss. Therefore, it is necessary to improve the prior art to overcome the defects in the prior art. SUMMARY

[0004] Therefore, the technical problem to be solved by the application is to provide a hot water pump capable of improving the lubricating effect of the bearing assembly.

[0005] To solve the above technical problems, the hot water pump comprises a pump shell, a rotating shaft, an outer magnetic assembly, a first pipeline, a second pipeline and a switch structure.

[0006] In some embodiments, the outer wall of the first pipeline is provided with heat dissipation fins.

[0007] In some embodiments, the hot water pump further comprises a fan assembly configured to send air to the first pipeline, the fan assembly at least comprising a first fan blade and a first motor driving the first fan blade to rotate.

[0008] In some embodiments, the switch structure is configured to change the second flow channel from the flow-through state to the cut-off state when the temperature of the liquid in the cover cavity is lower than the temperature of the liquid in the pump cavity and the temperature difference reaches a preset temperature difference.

[0009] In some embodiments, the switch structure comprises a lever pivoted to the end of the rotating shaft, a shape memory alloy piece provided at one end of the lever, and a plug body provided at the other end of the lever, wherein the shape memory alloy piece and the plug body are respectively located on the two sides of the pivot of the lever; one end of the shape memory alloy piece is connected to one end of the lever, and the other end is connected to the end of the rotating shaft. The shape memory alloy component is configured to deform and elongate when the temperature of the liquid in the cover cavity is lower than the temperature of the liquid in the pump cavity, or when the temperature difference between the liquid in the cover cavity and the liquid in the pump cavity is greater than a preset temperature difference, thereby forcing the lever to rotate and press the plug into the inlet end of the second flow channel; and when the temperature of the liquid in the cover cavity is higher than the temperature of the liquid in the pump cavity, or when the temperature difference between the liquid in the cover cavity and the liquid in the pump cavity is less than the preset temperature difference, the shape memory alloy component retracts to its initial state, in which the plug exits the inlet end of the second flow channel; or... The switch structure includes a shape memory alloy component and a plug body. One end of the shape memory alloy component is connected to the plug body, and the other end is connected to the cavity wall of the cover cavity. The shape memory alloy component is configured to deform and elongate when the temperature of the liquid in the cover cavity is lower than the temperature of the liquid in the pump cavity, or when the temperature difference between the liquid in the cover cavity and the liquid in the pump cavity is greater than a preset temperature difference, so as to force the plug body to be pressed into the inlet end of the second flow channel; and when the temperature of the liquid in the cover cavity is higher than the temperature of the liquid in the pump cavity, or when the temperature difference between the liquid in the cover cavity and the liquid in the pump cavity is less than the preset temperature difference, the shape memory alloy component deforms and retracts to its initial state, in which the plug body exits the inlet end of the second flow channel.

[0010] In some embodiments, the switch structure further includes a first magnetic element and a second magnetic element, wherein the first magnetic element is disposed on the lever and the second magnetic element is disposed on the cavity wall of the cover cavity; The first magnetic component and the plug are located on the same end side of the lever. The first magnetic component and the second magnetic component cooperate to make the plug have a tendency to move away from the inlet end of the second flow channel.

[0011] In some embodiments, a second impeller is provided at one end of the rotating shaft located inside the shroud cavity, and the second impeller rotates synchronously with the rotating shaft.

[0012] In some embodiments, the first pipeline is provided with a reduced diameter section, which causes the diameter of the first pipeline to tend to decrease from large to small, and the other end of the second pipeline is connected to the reduced diameter section.

[0013] In some embodiments, the pump housing is provided with a connector assembly, which is configured to connect the housing cavity with the first pipeline and the second pipeline; The joint assembly comprises a joint piece, a locking piece arranged on the joint piece, a first thread and a second thread arranged on the outer peripheral wall of the joint piece, the rotation direction of the first thread is opposite to that of the second thread, the joint piece is screwed on the pump shell through the first thread, the locking piece is matched with the first thread, the locking piece abuts against the outer wall of the pump shell and is located at the end of the first thread close to the second thread, and the second thread is threadedly connected with the adapter on the first pipeline and the second pipeline.

[0014] In some embodiments, the pump shell comprises a pump cover, a middle support connected with the pump cover, and a separation cover connected with the middle support, wherein the pump cover and the middle support surround the pump cavity, the pump cover is provided with the pump inlet and the pump outlet; The middle support and the separation cover surround the cover cavity, the joint assembly is arranged on the separation cover, the separation cover is provided with a through hole communicating with the cover cavity, one end of the joint assembly is arranged in the through hole and the other end is arranged outside the through hole, and the part of the joint assembly outside the through hole is connected with the first pipeline and the second pipeline.

[0015] The technical scheme provided in the application has the following advantages: In the application, the first pipeline and the second pipeline can reduce the temperature of hot water in the cover cavity, ensure the environment conducive to the operation of the first bearing assembly and the second bearing assembly, and improve the lubrication effect of the bearing assembly. The fan assembly is used for sending air to the first pipeline and the second pipeline, and the heat dissipation airflow generated by the first fan blade further dissipates heat from the first pipeline and the second pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the specific embodiments or prior art, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The three-dimensional structure schematic diagram of the hot water pump provided in the application is shown in the figure; Figure 2 The cross-sectional structure schematic diagram of the hot water pump provided in the application is shown in the figure; Figure 3 The position relationship schematic diagram between the pump shell, the first pipeline and the second pipeline is shown in the figure; Figure 4 The Figure 3 The enlarged structure schematic diagram of the middle A area is shown in the figure; Figure 5A schematic view of the positional relationship between the pump shell and the switch structure; Figure 6 A schematic view of the positional relationship between the pump shell and the switch structure; Figure 5 A schematic view of the enlarged structure of the middle B region; Figure 7 A schematic view of the positional relationship between the pump shell and the switch structure; Figure 8 A schematic view of the positional relationship between the pump shell and the switch structure; Figure 9 A schematic view of the positional relationship between the pump shell and the switch structure; Figure 8 A schematic view of the enlarged structure of the middle C region; Figure 10 A schematic view of the positional relationship between the pump shell and the switch structure; Figure 11 A schematic view of the positional relationship between the pump shell and the switch structure; Figure 12 A schematic view of the positional relationship between the pump shell and the switch structure; Figure 13 A schematic view of the positional relationship between the pump shell and the switch structure; Figure 14 A schematic view of the positional relationship between the pump shell and the switch structure. DETAILED DESCRIPTION

[0018] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The present application will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0019] It should be noted that the terms “first”, “second” and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence.

[0020] In the present application, the orientation words such as “up”, “down”, “top”, “bottom” are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity direction of the components themselves. Similarly, for the convenience of understanding and description, “inner” and “outer” refer to the inner and outer relative to the contour of the components themselves, but the above-mentioned orientation words are not used to limit the present application.

[0021] The present application provides a hot water pump for conveying high-temperature medium, which can be hot water, hot oil or other special fluids, etc. In the following, hot water is taken as an example to illustrate the high-temperature medium, but based on the above description, the protection scope of the present application is not limited thereby.

[0022] AsFigures 1 to 3 As shown, the hot water pump includes at least a pump casing 100, which includes a pump cover 110, a central support 120 connected to the pump cover 110, and an isolation cover 130 connected to the central support 120. The pump cover 110 and the central support 120 enclose a pump cavity 140, which houses a first impeller 200. The pump cover 110 has a pump inlet 141 and a pump outlet 142, which are respectively connected to the pump cavity 140. Hot water enters the pump cavity 140 through the pump inlet 141 and is discharged from the pump cavity 140 through the pump outlet 142 under the pressurization effect of the first impeller 200.

[0023] The isolation cover 130 is a shell-shaped component, and the central support 120 and the isolation cover 130 enclose a cavity 150. An internal magnetic component 400 is housed within the cavity 150, and the internal magnetic component 400 is located inside the isolation cover 130. The pump chamber 140 and the cavity 150 are connected by a first flow channel, allowing hot water in the pump chamber 140 to enter the cavity 150 through the first flow channel.

[0024] The hot water pump also includes a rotating shaft 300, which is rotatably mounted on the pump housing 100. Specifically, the rotating shaft 300 is supported on the intermediate bearing 120 via a first bearing assembly 330, as shown below. Figure 10 and Figure 11 As shown, the first bearing assembly 330 includes at least a first sliding bearing 331, a first thrust ring 332, and a first transition ring 333. The first sliding bearing 331 is sleeved on the outer periphery of the rotating shaft 300, the first thrust ring 332 is sleeved on the outer periphery of the first sliding bearing 331, and the first transition ring 333 abuts against the end of the first sliding bearing 331 away from the first impeller 200. The first sliding bearing 331 bears the radial load of the rotating shaft 300 and the inner magnetic assembly 400, causing the rotating shaft 300 to rotate at a predetermined position. The first thrust ring 332 prevents excessive axial movement of the rotating shaft 300 along its axial direction, bears the axial load acting on the rotating shaft 300, and is wear-resistant. The first transition ring 333 plays an auxiliary and adjusting role.

[0025] In this application, the first thrust ring 332 and the first transition ring 333 are made of the same material as the first sliding bearing 331. The wear between two parts made of the same material is small, which can effectively reduce the wear between the first sliding bearing 331 and the intermediate bearing 120 and the inner magnetic assembly 400, and extend the service life of the first sliding bearing 331.

[0026] like Figure 12As shown, a first groove 3321 extending axially is recessed on the inner ring of the first thrust ring 332, extending from one axial end to the other. Further, a second groove 3322 extending radially is also provided on the end face of the first thrust ring 332, extending from the outer ring to the inner ring, with its end on the inner ring overlapping the end of the first groove 3321. This facilitates the lubrication of the first bearing assembly 330 by allowing hot water to pass through the first groove 3321 and the second groove 3322.

[0027] In this application, the aforementioned first flow channel includes at least a first groove 3321 and a second groove 3322. Hot water in the pump chamber 140 enters the cover chamber 150 sequentially through the first groove 3321 and the second groove 3322. Alternatively, the first flow channel may also include a connecting hole located on the central support 120, which penetrates the central support 120 to connect the pump chamber 140 and the cover chamber 150 located on opposite sides of the central support 120.

[0028] The rotating shaft 300 extends partly into the pump chamber 140 and partly into the cover chamber 150. A first impeller 200 is fitted onto the end of the rotating shaft 300 extending into the pump chamber 140, and an internal magnetic assembly 400 is provided on the portion of the rotating shaft 300 located within the cover chamber 150. A second flow channel 310 is provided on the rotating shaft 300, extending axially through it, allowing hot water in the cover chamber 150 to flow into the pump chamber 140.

[0029] like Figure 8 As shown, the isolation cover 130 is a hollow shell structure with one end open and the other end closed. The open end of the isolation cover 130 is connected to the central bearing 120. The isolation cover 130 also has a second bearing assembly 340 for supporting the rotating shaft 300. A stepped hole 132 is provided in the area near the closed end of the isolation cover 130. The stepped hole 132 is used to axially limit the second bearing assembly 340.

[0030] Specifically, the stepped hole 132 includes a large-diameter portion 1321 that communicates with and is adjacent to the hollow cavity of the isolation cover 130, and a small-diameter portion 1322 located on the side of the large-diameter portion away from the hollow cavity, wherein the hollow cavity, the large-diameter portion 1321, and the small-diameter portion 1322 are coaxially distributed. The stepped hole 132 can also be regarded as a recessed area formed on the cavity wall of the hollow cavity.

[0031] like Figure 10As shown, the structure of the second bearing assembly 340 is the same as that of the first bearing assembly 330, including a second sliding bearing 341, a second thrust ring 342, and a second transition ring 343. The second sliding bearing 341 and the second thrust ring 342 are located within the large-diameter portion 1321, and the second transition ring 343 is located within the hollow cavity of the isolation cover 130. Hot water in the hollow cavity of the isolation cover 130 flows into the small-diameter portion 1322 through the third groove (not shown) and the fourth groove (not shown) on the second bearing assembly 340, and then flows into the pump chamber 140 through the second flow channel 310. The third groove has the same structure as the first groove 3321, and the fourth groove has the same structure as the second groove 3322. The end of the rotating shaft 300 away from the first impeller 200 is located within the small-diameter portion 1322, and the second flow channel 310 has an inlet end 311 formed on the end of the rotating shaft 300 away from the first impeller 200.

[0032] The internal magnetic assembly 400 is located between the first bearing assembly 330 and the second bearing assembly 340; specifically, the internal magnetic assembly 400 is located between the first transition ring 333 and the second transition ring 343. (Continue reading...) Figure 10 The inner magnetic assembly 400 includes an inner magnetic support 410 and a plurality of inner magnets 420 disposed on the outer periphery of the inner magnetic support 410. The inner magnetic support 410 is provided with a through hole 411 extending through it along the axial direction. The through hole 411 can connect the regions on both sides of the inner magnetic assembly 400 along the axial direction, which is conducive to the circulation of hot water.

[0033] There is a gap between the outer circumferential surface of the inner magnetic component 400 and the cavity wall of the isolation cover 130, and the gap is smaller than the diameter of the through hole 411. Hot water inside the isolation cover 130 can also circulate through the gap.

[0034] The hot water pump also includes an external magnetic assembly 500, which cooperates with the internal magnetic assembly 400 to achieve contactless drive through magnetic coupling. Figure 2 and Figure 3 As shown, the external magnetic assembly 500 is located on the outside of the pump housing 100 and connected to the rotary drive source 510. Specifically, the external magnetic assembly 500 is located on the outer periphery of the isolation cover 130, and the output end of the rotary drive source 510 is connected to the external magnetic assembly 500, driving the external magnetic assembly 500 to rotate. After the external magnetic assembly 500 rotates, the inner magnetic assembly 400 rotates synchronously with the external magnetic assembly 500 under the action of magnetic coupling, thereby driving the rotating shaft 300 to rotate, and finally driving the first impeller 200 to rotate.

[0035] The rotary drive source 510 is a motor, and it is connected to the pump cover 110 via a connecting seat 520. A vibration damping pad 521 is provided between the rotary drive source 510 and the connecting seat 520 to effectively reduce vibrations transmitted from the rotary drive source 510 to the connecting seat 520. The connecting seat 520 and the rotary drive source 510 are connected by a first fastener, which is a common bolt.

[0036] like Figure 2 and Figure 10 As shown, the connecting seat 520 and the pump cover 110 are connected by a second fastener, which is a long bolt. The intermediate support 120 and the isolation cover 130 are pressed between the pump cover 110 and the connecting seat 520. Furthermore, the intermediate support 120 and the isolation cover 130 are connected by a third fastener, making the intermediate support 120 and the isolation cover 130 a whole, which is convenient for installation. A first sealing element 160 is also provided between the intermediate support 120 and the isolation cover 130. After the intermediate support 120 and the isolation cover 130 are connected by the third fastener, the first sealing element 160 is pressed between the intermediate support 120 and the isolation cover 130, which can effectively prevent hot water leakage in the cover cavity 150.

[0037] Furthermore, such as Figure 10 As shown, a second sealing element 161 is provided between the middle support 120 and the pump cover 110. When the connecting seat 520 and the pump cover 110 are connected by the second fastener, the second sealing element 161 is pressed between the middle support 120 and the pump cover 110, thereby preventing hot water leakage from the pump chamber 140.

[0038] In this application, the central support 120 and the isolation cover 130 are connected to the first seal 160 by a third fastener, and the connecting seat 520 and the pump cover 110 are connected to the second seal 161 by a second fastener. That is to say, a setting method in which one fastener connection corresponds to one seal is adopted. The above setting method can effectively improve the sealing effect of the pump cavity 140 and the cover cavity 150 and prevent hot water leakage.

[0039] The liquid entering the isolation cover 130 from the pump chamber 140 serves to cool and lubricate the first bearing assembly 330 and the second bearing assembly 340, ensuring the safe operation of the hot water pump. Considering that the medium pumped by the hot water pump is high-temperature hot water, this high temperature can negatively impact the lubrication of the first bearing assembly 330 and the second bearing assembly 340. Lubrication of the first bearing assembly 330 and the second bearing assembly 340 requires the formation and maintenance of a stable lubricating film between the friction pairs of the bearing assemblies. High temperatures can damage this lubricating film, easily leading to wear on the first bearing assembly 330 and the second bearing assembly 340. Furthermore, high temperatures can decrease the hardness of the first bearing assembly 330 and the second bearing assembly 340, reducing their fatigue resistance and wear resistance. Figures 1 to 3As shown in this application, the hot water pump further includes a first pipe 600 and a second pipe 610. The first pipe 600 and the second pipe 610 are used to cool the hot water (liquid) in the shroud 150 to minimize the negative impact of high temperature on the first bearing assembly 330 and the second bearing assembly 340.

[0040] Both the first pipe 600 and the second pipe 610 are located outside the pump casing 100. One end of the first pipe 600 is connected to the pump outlet 142, and the other end is connected to the housing 150. One end of the second pipe 610 is connected to the housing 150, and the other end is connected to the first pipe 600. By setting up the first pipe 600 and the second pipe 610, the temperature of the hot water in the housing 150 can be reduced, thereby providing a favorable working environment for the first bearing assembly 330 and the second bearing assembly 340.

[0041] The pressure at pump outlet 142 is significantly higher than the pressure at pump inlet 141. The hot water at pump outlet 142 flows into the housing 150 through the first pipe 600. During its flow within the first pipe 600, the hot water loses some heat, lowering the temperature of the water entering the housing 150. In this application, by utilizing the characteristic that the pressure at pump outlet 142 is greater than the pressure inside the housing 150, an additional pump structure is unnecessary in the first pipe 600, effectively reducing the number of components. Furthermore, this application directly utilizes the medium transported by the hot water pump, eliminating the need for an external water source, resulting in a simpler overall piping structure.

[0042] The pressure conditions within the pump chamber 140 are as follows: The central region of the first impeller 200 is connected to the pump inlet 141, where the pressure is lowest. External hot water is drawn into the first impeller 200 from the pump inlet 141. The first impeller 200 performs work on the hot water, continuously increasing its kinetic and pressure energy, reaching its maximum peak pressure at the pump outlet 142. The first flow channel is located in the central region of the first impeller 200, and the first pipe 600 is located at the pump outlet 142. Therefore, the pressure in the first flow channel is lower than the pressure in the first pipe 600. When the hot water pump is operating, the hot water in the pump chamber 140 mainly enters the isolation cover 130 through the first pipe 600, while relatively little hot water enters the pump chamber 140 through the first flow channel.

[0043] Furthermore, the outer wall of the first pipe 600 is provided with heat dissipation fins 620. The heat dissipation fins 620 can increase the heat dissipation area of ​​the first pipe 600, and the hot water can be cooled during its flow in the first pipe 600, so that the temperature of the hot water entering the cover cavity 150 is lower than the temperature of the hot water in the pump cavity 140, thereby reducing the temperature of the liquid medium in the cover cavity 150. Similarly, heat dissipation fins 620 can also be provided on the second pipe 610, and the heat dissipation fins 620 on the second pipe 610 are used to dissipate heat from the hot water in the second pipe 610.

[0044] Preferred, such as Figure 13 As shown, the heat dissipation fins 620 are distributed in a spiral shape on the outer circumferential wall of the first pipe 600. Compared with vertical fins, the spiral heat dissipation fins 620 can arrange more heat dissipation area in the same volume. The spiral heat dissipation fins 620 can also increase the rigidity of the outer circumferential wall of the first pipe 600 and reduce deformation caused by thermal expansion and contraction or external forces.

[0045] In this application, as Figure 3 As shown, the first pipe 600 is provided with a reduced diameter section 640, which causes the diameter of the first pipe 600 to decrease from large to small. The other end of the second pipe 610 is connected to the reduced diameter section 640.

[0046] The connection between the first pipe 600 and the second pipe 610 creates a Venturi effect. When hot water flows through the narrowing section 640 in the first pipe 600, the flow velocity increases and the static pressure drops to a minimum. This local low-pressure area becomes an intake, facilitating the drawing of hot water from the second pipe 610 into the first pipe 600. The second pipe 610 can be without moving parts, drawing hot water from the cavity 150 and mixing it with the hot water in the first pipe 600. The narrowing section 640 has a gentle conical or streamlined curve, avoiding abrupt right-angle changes.

[0047] Furthermore, downstream of the reduced diameter section 640 is an expanded diameter section 641. The expanded diameter section 641 provides a smooth transition zone for the hot water to transition from a high-speed state back to a normal pipe flow rate, making the hot water flow more evenly and stably within the first pipe 600.

[0048] The first pipe 600 and / or the second pipe 610 are equipped with valve structures (not shown in the figure), including the following three cases: the first case, the first pipe 600 is equipped with a valve structure; the second case, the second pipe 610 is equipped with a valve structure; and the third case, the first pipe 600 and the second pipe 610 are equipped with valve structures. In this application, the valve structures control whether the first pipe 600 and the second pipe 610 perform heat dissipation operations.

[0049] When the valve structure causes the first pipe 600 and the second pipe 610 to be cut off, and the first pipe 600 and the second pipe 610 do not participate in heat dissipation, the temperature of the cover cavity 150 is approximately equal to the temperature of the pump cavity 140. The reason the temperature of the cover cavity 150 is approximately equal to that of the pump cavity 140 is that although there is heat loss during the flow of hot water from the pump cavity 140 to the cover cavity 150 through the first flow channel, the heat generated during the magnetic coupling of the inner magnetic component 400 and the outer magnetic component 500, as well as the heat generated during the operation of the bearing assembly, compensates for this heat loss, making the temperatures of the pump cavity 140 and the cover cavity 150 similar.

[0050] When the valve structure allows the first pipe 600 and the second pipe 610 to be in a flow state, the first pipe 600 and the second pipe 610 can dissipate heat from the hot water flowing through them, so that the temperature of the hot water entering the shroud 150 is lower than the temperature of the hot water in the pump chamber 140, thereby creating a favorable working environment for the first bearing assembly 330 and the second bearing assembly 340.

[0051] In this application, as Figure 8 As shown, the isolation cover 130 has a first through hole 131 and a second through hole 133 on the end near the central support 120. The first through hole 131 and the second through hole 133 are respectively connected to the cover cavity 150. One of the first through hole 131 and the second through hole 133 is connected to the first pipeline 600, and the other is connected to the second pipeline 610.

[0052] In one embodiment, the first through hole 131 is connected to the first pipe 600, and the second through hole 133 is connected to the second pipe 610. The first through hole 131 can be regarded as the liquid inlet of the cover cavity 150, through which hot water in the first pipe 600 enters the cover cavity 150. The second through hole 133 can be regarded as the liquid outlet of the cover cavity 150, through which hot water in the cover cavity 150 flows out of the cover cavity 150.

[0053] Furthermore, the pump housing 100 is provided with a connector assembly 800, which is configured to connect the housing cavity 150 with the first pipeline 600 and the second pipeline 610.

[0054] like Figure 9 As shown, the connector assembly 800 is disposed on the isolation cover 130. Specifically, the connector assembly 800 is disposed on the first through hole 131 and the second through hole 133 respectively. One end of the connector assembly 800 is installed inside the through hole (first through hole 131, second through hole 133), and the other end is located outside the through hole (first through hole 131, second through hole 133). The portion of the connector assembly 800 located outside the first through hole 131 is connected to the first pipe 600 and the second pipe 610.

[0055] The connector assembly 800 includes a connector 810 and a locking member 820 disposed on the connector 810. The outer peripheral wall of the connector 810 is provided with a first thread 811 and a second thread 812, wherein the first thread 811 and the second thread 812 have opposite directions of rotation. The connector 810 is a tubular part with open ends and hollow interior.

[0056] The connector 810 is screwed onto the pump housing 100 via a first thread 811. Specifically, the connector 810 is screwed onto the isolation cover 130 via the first thread 811. The locking member 820 engages with the first thread 811, abutting against the outer wall of the pump housing 100 (specifically the isolation cover 130) and located at the end of the first thread 811 near the second thread 812. The second thread 812 is threadedly connected to the fitting 601 on the first pipeline 600 and the second pipeline 610.

[0057] During installation, the connector 810 is fixed to the isolation cover 130 by the locking member 820. Then, the mating connector 601 is tightened on the second thread 812, so that the mating connector 601 abuts against the locking member 820. The locking member 820 and the mating connector 601 can be regarded as two nuts screwed onto the connector 810. Since the threads that mate with the locking member 820 and the mating connector 601 have opposite directions of rotation, the axial movement directions of the locking member 820 and the mating connector 601 when tightened are opposite. There is a large preload force between the locking member 820 and the mating connector 601, which can effectively prevent the mating connector 601 from loosening and form a mechanical interlock. The locking member 820 and the mating connector 601 are locked together, and a huge friction force is generated between the mating surfaces of the locking member 820 and the mating connector 601, which greatly increases the torque required to rotate from the loosening direction.

[0058] In this application, as Figures 3 to 7 As shown, the hot water pump also includes a switching structure 700, which is located within the housing 150 and at the inlet end 311 of the second flow channel 310. The switching structure 700 responds to changes in the temperature of the hot water within the housing 150, causing the second flow channel 310 to switch between a flowing state and a cut-off state. In the flowing state, the hot water in the housing 150 can flow through the second flow channel 310 to the pump chamber 140. In the cut-off state, the second flow channel 310 is cut off, and the hot water in the housing 150 cannot flow through the second flow channel 310 to the pump chamber 140.

[0059] The switch structure 700 is configured to change the second flow channel 310 from a flow state to a cut-off state when the hot water temperature in the housing 150 is lower than the hot water temperature in the pump chamber 140 and the temperature difference reaches a preset temperature difference. This prevents the low-temperature water in the housing 150 from entering the pump chamber 140 and affecting the temperature of the hot water in the pump chamber 140. Here, the "preset temperature difference" can be 0°, 1°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, etc.

[0060] The temperature of the hot water in pump chamber 140 should ideally be maintained at a predetermined temperature to meet usage requirements. For example, when the hot water pump is used for whole-house heating, the heated water flows through the pump into underfloor heating pipes, fan coil units, or radiators to circulate heat into the room. If low-temperature water from enclosure 150 enters pump chamber 140, it will lower the temperature of the hot water in pump chamber 140, thus affecting the heating effect, which is undesirable.

[0061] Regarding the specific structure of the switch structure 700, in one embodiment, as follows: Figure 3 and Figure 4 As shown, the switch structure 700 includes a lever 710 pivotally mounted on the end of a rotating shaft 300, a shape memory alloy member 720 disposed at one end of the lever 710, and a plug 730 disposed at the other end of the lever 710. The shape memory alloy member 720 and the plug 730 are located on opposite sides of the pivot point of the lever 710. One end of the shape memory alloy member 720 is connected to one end of the lever 710, and the other end is connected to the end of the rotating shaft 300.

[0062] In this application, the shape memory alloy part 720 is configured to deform and elongate when the temperature of the hot water in the cover cavity 150 is lower than the temperature of the hot water in the pump cavity 140, or when the temperature difference between the hot water in the cover cavity 150 and the hot water in the pump cavity 140 is greater than or equal to a preset temperature difference, so as to force the lever 710 to rotate and press the plug 730 into the inlet end 311 of the second flow channel 310. At this time, the second flow channel 310 is in a cut-off state.

[0063] When the second flow channel 310 is in the cut-off state, the hot water in the cover cavity 150 cannot flow back to the pump cavity 140 through the second flow channel 310. This prevents lower-temperature hot water from entering the pump cavity 140 and affecting the temperature of the hot water inside the pump cavity 140. At this time, the hot water pump has two liquid passages: one is the liquid passage between the pump inlet 141 and the pump outlet 142, which is used to achieve the normal pumping task of the hot water pump; the other is the heat dissipation passage between the pump outlet 142, the first pipe 600, the cover cavity 150, the second pipe 610, and the first pipe 600, used to cool the hot water entering the cover cavity 150, thereby ensuring the lubrication effect of the first bearing assembly 330 and the second bearing assembly 340.

[0064] The shape memory alloy part 720 is also configured to deform and retract to its initial state when the liquid temperature in the cover cavity 150 is greater than or equal to the liquid temperature in the pump cavity 140, or when the temperature difference between the liquid in the cover cavity 150 and the liquid in the pump cavity 140 is less than a preset temperature difference.

[0065] In the initial state, the plug 730 exits from the inlet end 311 of the second flow channel 310. At this time, the second flow channel 310 is in a flowing state, and the hot water in the cover cavity 150 can flow into the pump cavity 140 through the second flow channel 310. In this configuration, the hot water pump has three liquid passages. The first liquid passage is between the pump inlet 141 and the pump outlet 142, which is used to perform the normal pumping task of the hot water pump. The second liquid passage is between the pump chamber 140, the first flow channel, the cover chamber 150, the second flow channel 310, and the pump chamber 140. This liquid passage can introduce hot water from the pump chamber 140 into the isolation cover 130 for lubrication of the first bearing assembly 330 and the second bearing assembly 340. The hot water in the isolation cover 130 can also return to the pump chamber 140 through the second flow channel 310. The third liquid passage is a heat dissipation passage between the pump outlet 142, the first pipe 600, the cover chamber 150, the second pipe 610, and the first pipe 600, which is used to cool the hot water entering the cover chamber 150.

[0066] When the switch structure 700 includes a lever 710 pivoting at the end of the pivot 300, such as Figure 4 As shown, the switch structure 700 also includes a first magnetic element 740 and a second magnetic element 750. The first magnetic element 740 is disposed on the lever 710, and the second magnetic element 750 is disposed on the cavity wall of the cover cavity 150. The first magnetic element 740 and the plug 730 are located on the same end side of the lever 710. The first magnetic element 740 and the second magnetic element 750 cooperate to make the plug 730 have a tendency to move away from the inlet end of the second flow channel 310.

[0067] Both the first magnetic element 740 and the second magnetic element 750 are magnets, and the magnetic properties of the first magnetic element 740 and the second magnetic element 750 are opposite. Thus, the magnetic force between the first magnetic element 740 and the second magnetic element 750 ensures that the inlet end 311 is in the open state. It is worth noting that the force generated by the shape memory alloy element 720 must be greater than the magnetic force between the first magnetic element 740 and the second magnetic element 750 to ensure that the plug 730 can be effectively inserted into the inlet end 311.

[0068] In another embodiment, such as Figures 5 to 7 As shown, the switch structure 700 includes a shape memory alloy component 720 and a plug body 730. One end of the shape memory alloy component 720 is connected to the plug body 730, and the other end is connected to the cavity wall of the cover cavity 150.

[0069] The shape memory alloy component 720 is configured to deform and elongate when the liquid temperature in the cover cavity 150 is lower than the liquid temperature in the pump cavity 140, or when the temperature difference between the liquid in the cover cavity 150 and the liquid in the pump cavity 140 is greater than a preset temperature difference, so as to force the plug 730 to be pressed into the inlet end of the second flow channel 310; and when the liquid temperature in the cover cavity 150 is greater than the liquid temperature in the pump cavity 140, or when the temperature difference between the liquid in the cover cavity 150 and the liquid in the pump cavity 140 is less than the preset temperature difference, the shape memory alloy component 720 deforms and retracts to the initial state, in which the plug 730 exits the inlet end of the second flow channel 310.

[0070] Furthermore, such as Figure 7 As shown, the plug 730 is also provided with a guide rod 760, and the cavity wall of the isolation cover 130 is provided with a guide groove 770 that mates with the guide rod 760. Part of the guide rod 760 is located within the guide groove 770, and part extends to the outside of the guide groove 770. The plug 730 is located at the end of the portion of the guide rod 760 located outside the guide groove 770. The guide rod 760 includes a rod body 761 and a limiting block 762 located at the end of the rod body 761. The limiting block 762 and the plug 730 are respectively located at opposite ends of the rod body 761.

[0071] The end of the guide groove 770 near the rotating shaft 300 is open. A spacer 771 is provided at the open end of the guide groove 770. The spacer 771 has a clearance hole (not shown) for the rod body 761 to pass through. The diameter of the clearance hole is smaller than the diameter of the guide groove 770. When the limiting block 762 abuts against the spacer 771, the spacer 771 can limit the guide rod 760 and prevent the guide rod 760 from disengaging from the guide groove 770 under the action of the shape memory alloy part 720.

[0072] In this application, as Figure 3 and Figure 4 As shown, a second impeller 320 is provided at one end of the rotating shaft 300 located inside the cover cavity 150, and the second impeller 320 rotates synchronously with the rotating shaft 300. The second impeller 320 is located inside the small diameter portion 1322. After the second impeller 320 rotates, it generates a forced circulation driving force within the small diameter portion 1322, creating a relatively "low-pressure zone" within the small diameter portion 1322. This "low-pressure zone" allows the hot water in the hollow cavity of the isolation cover 130 to flow more rapidly into the small diameter portion 1322, and then through the second flow channel 310 on the rotating shaft 300 to the pump cavity 140, which facilitates the circulation of hot water between the pump cavity 140 and the cover cavity 150.

[0073] like Figure 6As shown, the outer diameter of the end of the rotating shaft 300 with the second impeller 320 is larger than the outer diameter of the main body with the first bearing assembly 330 and the second bearing assembly 340. A limiting shoulder is formed between the end of the rotating shaft 300 with the second impeller 320 and the main body of the rotating shaft 300, and the limiting shoulder can be used for axial limiting of the second bearing assembly 340.

[0074] like Figure 13 and Figure 14 As shown, the hot water pump also includes a fan assembly 630, which is configured to supply air to the first conduit 600. The fan assembly 630 includes at least a first fan blade 631 and a first motor (not shown) that drives the first fan blade 631 to rotate. Understandably, the fan assembly 630 can also be used to supply air to the second conduit 610, and the cooling airflow generated by the first fan blade 631 further cools the first conduit 600 and the second conduit 610.

[0075] The fan assembly 630 also includes a frame housing 632, on which at least one first fan blade 631 is mounted. The first fan blade 631 is rotatably mounted on the frame housing 632 and is distributed towards the heat dissipation fins 620. The frame housing 632 also has a receiving cavity 6321, within which the portion of the first pipe 600 with the heat dissipation fins 620 is located. The first fan blade 631, the first pipe 600, and the heat dissipation fins 620 are all housed within the frame housing 632, which forces airflow along a preset path, ensuring that the airflow passes over key heat-generating components such as the first pipe 600 and the heat dissipation fins 620, greatly improving cooling efficiency. The first pipe 600 is distributed within the frame housing 632 in a U-shaped reciprocating bending manner, which helps to maximize the length of the first pipe 600 within the available space, resulting in good heat dissipation.

[0076] Furthermore, the portion of the second pipe 610 with heat dissipation fins 620 is also located on the frame 632. Specifically, the portion of the second pipe 610 with heat dissipation fins 620 is housed within the frame 632. The airflow generated by the first fan blade 631 blows towards the heat dissipation fins 620 of the second pipe 610 to dissipate heat from the second pipe 610.

[0077] Obviously, the embodiments described above are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, those skilled in the art can make other variations or modifications without creative effort, and all such variations or modifications should fall within the scope of protection of this application.

Claims

1. A hot water pump, characterized in that, include: The pump casing (100) has a pump chamber (140) and a cover chamber (150). The pump chamber (140) is provided with a first impeller (200), and the cover chamber (150) houses an internal magnetic assembly (400). The pump chamber (140) and the cover chamber (150) are connected by a first flow channel. Liquid in the pump chamber (140) can enter the cover chamber (150) through the first flow channel. The pump casing (100) is provided with a pump inlet (141) and a pump outlet (142). A rotating shaft (300) is rotatably mounted on the pump housing (100). Part of the rotating shaft (300) is located inside the pump chamber (140) and part is located inside the cover cavity (150). The rotating shaft (300) is provided with the first impeller (200) and the inner magnetic assembly (400). The rotating shaft (300) is provided with a second flow channel (310) that extends through it axially. The liquid in the cover cavity (150) can flow to the pump chamber (140) through the second flow channel (310). An external magnetic assembly (500) is disposed on the outside of the pump housing (100) and connected to the rotary drive source (510). The external magnetic assembly (500) cooperates with the internal magnetic assembly (400). The first pipeline (600) is located outside the pump casing (100), with one end of the first pipeline (600) connected to the pump outlet (142) and the other end connected to the shroud cavity (150); The second pipeline (610) is located outside the pump casing (100). One end of the second pipeline (610) is connected to the cover cavity (150), and the other end is connected to the first pipeline (600). A switching structure (700) is located inside the cavity (150) and at the inlet end of the second flow channel (310). The switching structure (700) switches the second flow channel (310) between a flow state and a cut-off state in response to changes in the liquid temperature inside the cavity (150).

2. The hot water pump as described in claim 1, characterized in that, The outer wall of the first pipe (600) is provided with heat dissipation fins (620).

3. The hot water pump as described in claim 1, characterized in that, It also includes a fan assembly (630) configured to supply air to the first duct (600), the fan assembly including at least a first fan blade (631) and a first motor that drives the first fan blade (631) to rotate.

4. The hot water pump as described in claim 1, characterized in that, The switching structure (700) is configured to change the second flow channel (310) from a flow state to a cut-off state when the liquid temperature in the shroud (150) is lower than the liquid temperature in the pump chamber (140) and the temperature difference reaches a preset temperature difference.

5. The hot water pump as described in claim 4, characterized in that, The switch structure (700) includes a lever (710) pivotally mounted on the end of the shaft (300), a shape memory alloy component (720) disposed at one end of the lever (710), and a plug (730) disposed at the other end of the lever (710), wherein the shape memory alloy component (720) and the plug (730) are respectively located on both sides of the pivot point of the lever (710); one end of the shape memory alloy component (720) is connected to one end of the lever (710), and the other end is connected to the end of the shaft (300); The shape memory alloy component (720) is configured to deform and elongate when the liquid temperature in the housing (150) is lower than the liquid temperature in the pump chamber (140), or when the temperature difference between the liquid in the housing (150) and the liquid in the pump chamber (140) is greater than a preset temperature difference, thereby forcing the lever (710) to rotate and press the plug (730) into the inlet end of the second flow channel (310); and when the liquid temperature in the housing (150) is higher than the liquid temperature in the pump chamber (140), or when the temperature difference between the liquid in the housing (150) and the liquid in the pump chamber (140) is less than a preset temperature difference, the shape memory alloy component (720) retracts to its initial state, in which the plug (730) exits the inlet end of the second flow channel (310); or, The switch structure (700) includes a shape memory alloy component (720) and a plug (730), one end of the shape memory alloy component (720) is connected to the plug (730), and the other end is connected to the cavity wall of the cover cavity (150); The shape memory alloy component (720) is configured to deform and elongate when the liquid temperature in the cover cavity (150) is lower than the liquid temperature in the pump cavity (140), or when the temperature difference between the liquid in the cover cavity (150) and the liquid in the pump cavity (140) is greater than a preset temperature difference, so as to force the plug (730) to be pressed into the inlet end of the second flow channel (310); and when the liquid temperature in the cover cavity (150) is greater than the liquid temperature in the pump cavity (140), or when the temperature difference between the liquid in the cover cavity (150) and the liquid in the pump cavity (140) is less than a preset temperature difference, the shape memory alloy component (720) deforms and retracts to the initial state, in which the plug (730) exits the inlet end of the second flow channel (310).

6. The hot water pump as described in claim 5, characterized in that, The switch structure (700) further includes a first magnetic element (740) and a second magnetic element (750), wherein the first magnetic element (740) is disposed on the lever (710) and the second magnetic element (750) is disposed on the cavity wall of the cover cavity (150); The first magnetic element (740) and the plug (730) are located on the same end side of the lever (710). The first magnetic element (740) and the second magnetic element (750) cooperate to make the plug (730) have a tendency to move away from the inlet end of the second flow channel (310).

7. The hot water pump as described in claim 1, characterized in that, The rotating shaft (300) is provided with a second impeller (320) at one end inside the cover cavity (150), and the second impeller (320) rotates synchronously with the rotating shaft (300).

8. The hot water pump as described in claim 1, characterized in that, The first pipeline (600) is provided with a reduced diameter section (640), which makes the diameter of the first pipeline (600) tend to decrease from large to small. The other end of the second pipeline (610) is connected to the reduced diameter section (640).

9. The hot water pump as described in claim 1, characterized in that, The pump housing (100) is provided with a connector assembly (800), which is configured to connect the housing (150) with the first pipeline (600) and the second pipeline (610). The connector assembly (800) includes a connector (810) and a locking member (820) disposed on the connector (810). The outer peripheral wall of the connector (810) is provided with a first thread (811) and a second thread (812). The first thread (811) and the second thread (812) have opposite directions of rotation. The connector (810) is screwed onto the pump housing (100) through the first thread (811). The locking member (820) cooperates with the first thread (811). The locking member (820) abuts against the outer wall of the pump housing (100) and is located at the end of the first thread (811) near the second thread (812). The second thread (812) is threadedly connected to the fittings on the first pipeline (600) and the second pipeline (610).

10. The hot water pump as described in claim 9, characterized in that, The pump housing (100) includes a pump cover (110), a central support (120) connected to the pump cover (110), and an isolation cover (130) connected to the central support (120). The pump cover (110) and the central support (120) together form the pump cavity (140). The pump cover (110) is provided with the pump inlet (141) and the pump outlet (142). The central support (120) and the isolation cover (130) surround to form the cover cavity (150). The connector assembly (800) is disposed on the isolation cover (130). The isolation cover (130) is provided with a through hole communicating with the cover cavity (150). One end of the connector assembly (800) is installed in the through hole and the other end is located outside the through hole. The part of the connector assembly (800) located outside the through hole is connected to the first pipeline (600) and the second pipeline (610).

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