Water pump and hot water system comprising same

Abstract

This utility model provides a water pump and a hot water system including the same. The water pump housing has an inlet, a mounting cavity, and an outlet connected in sequence. A positioning shaft is fixed inside the mounting cavity, and a bushing is rotatably fitted onto the positioning shaft. A rotating part is mounted on the bushing. The water pump is equipped with a bypass channel and a control valve. The first and second openings of the channel and the mounting cavity form an independent circulation loop. The control valve is used to control the opening and closing of the circulation loop. When the water pump starts, the rotating part drives the bushing to rotate relative to the positioning shaft. At this time, the water flows through the independent circulation loop, avoiding entering the original cold water loop of the hot water system and preventing the water heater's heating sensor from being triggered. This allows the water heater to complete the self-draining process through the relative rotation of the bushing and the positioning shaft without activating the heating device. At the same time, when the control valve is closed, it prevents the circulation loop from interfering with the normal water flow drive of the original cold water loop, ensuring the stable operation of the hot water system.

Description

Technical Field

[0001] This utility model relates to the technical field of components for water supply devices, and in particular to a water pump and a hot water system including the same. Background Technology

[0002] In water pumps, especially those used in zero-cold-water water heaters, designers often set the clearance between the bushing and the positioning shaft to be relatively small in order to reduce noise. This leads to scale buildup in the clearance between the bushing and the positioning shaft when the pump is not in operation for extended periods. The existing solution is to periodically turn on the pump to bring it into operation. However, the pump's operation causes water to flow in the pipes, which in turn triggers the flow sensor and starts the water heater, creating certain safety hazards.

[0003] Therefore, how to generate a certain relative displacement between the pump's bushing and the positioning shaft without triggering the heating device's start-up mechanism in the hot water system has become a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defect in the prior art that turning on the water pump to enter the zero cold water circuit will cause the heating device to start, and to provide a water pump and a hot water system including the same.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A water pump for a water heater, comprising:

[0007] A housing having an inlet, a mounting cavity, and an outlet connected in sequence;

[0008] The positioning shaft is fixed inside the mounting cavity;

[0009] A bushing is rotatably fitted onto the positioning shaft;

[0010] A rotating part is disposed within the mounting cavity and mounted on the bushing;

[0011] The water pump is provided with a bypass channel and a control valve. The bypass channel has a first opening and a second opening. The first opening, the mounting cavity and the second opening are connected in sequence to form a circulation loop. The control valve is located at the bypass channel and is used to control the opening and closing of the circulation loop.

[0012] The bypass channel and control valve allow the pump's mounting chamber and bypass channel to form a circulation loop independent of the original cold water loop of the hot water system. The control valve controls the opening and closing of this circulation loop. When the pump is started, causing the rotating part to rotate relative to the positioning shaft to prevent scale buildup between the shaft and the positioning shaft, the water agitated by the rotating part can flow through this circulation loop. This prevents the agitated water from flowing through the original cold water loop of the hot water system, thus avoiding triggering the heating sensor and causing the water heater to start. In other words, relative rotation between the positioning shaft and the shaft sleeve can be achieved without starting the heating device, achieving the technical effect of removing scale between the positioning shaft and the shaft sleeve (completing the drainage work) without the heating device emitting noise and avoiding safety hazards. The control valve controls the opening and closing of the circulation loop, preventing interference with the pump-driven water flow in the cold water loop of the hot water system.

[0013] Preferably, the water pump is used in a gas water heater;

[0014] Preferably, the water pump is installed inside the water heater.

[0015] Preferably, the bypass channel includes at least a first section, the first section, the valve stem of the control valve, and the positioning shaft are arranged in parallel, and the valve stem extends into the first section to disconnect the circulation loop.

[0016] The first section of the bypass channel is set parallel to the valve stem of the control valve. This facilitates the valve stem's closure of the bypass channel. The simple, straight design effectively reduces design and manufacturing complexity. The positioning shaft is generally parallel to the horizontal direction. Setting the first section and valve stem parallel to the positioning shaft makes machining the first section and installing / operating the control valve convenient.

[0017] Preferably, the inlet orientation of the water pump is set at 90 degrees to the outlet orientation of the water pump, the extension direction of the first segment is parallel to the orientation of the inlet, the bypass channel further includes a second segment, the two ends of the second segment are respectively connected to the inlet and the first segment, and the second segment extends along the orientation of the outlet.

[0018] The water pump outlet is set at a 90-degree angle to the water pump inlet, meaning the outlet is perpendicular to the positioning shaft. This directs the water flow along the tangential direction of the rotation of the rotating part, improving the pumping efficiency. The second section connects to the first section and the inlet respectively, extending along the outlet direction. This design facilitates the installation of a control valve, shortens the path of the independent circulation loop, reduces water flow resistance, and makes it easier for water to flow through the circulation loop during sewage discharge, further reducing the risk of the water heater's heating element starting up.

[0019] Preferably, the inlet orientation is set at a 90-degree angle to the outlet orientation, and the inlet orientation is set parallel to the positioning axis.

[0020] The outlet and inlet of the water pump are set at a 90-degree angle, while the positioning shaft is set parallel to the inlet. That is, the outlet of the water pump is perpendicular to the positioning shaft. At this time, the rotating part guides the water flow along the tangent of the rotation of the rotating part to the outlet of the water pump, which helps to improve the pumping effect of the water pump.

[0021] Preferably, the control valve and the bypass channel are disposed outside the housing, and the mounting cavity is formed inside the housing.

[0022] The newly added control valve and bypass channel are located outside the pump casing, without altering the original pump's internal structure and related components. This results in relatively low design and manufacturing costs for the new mold.

[0023] Preferably, the water pump is further provided with a bypass section, the bypass channel is formed in the bypass section, and the bypass section and the portions of the housing that form the inlet and the outlet are integrally formed.

[0024] The design of the bypass section being integrally formed with the inlet and outlet parts in the housing provides higher sealing reliability and reduces the likelihood of seam cracking compared to a split design, while also simplifying the assembly process.

[0025] Preferably, the housing includes a first part and a second part, the inlet and the outlet are disposed on the first part, the bypass part is integrally formed with the first part, the second part has a cavity to accommodate the rotating part, and the first part covers the opening of the cavity of the second part and surrounds it to form the mounting cavity.

[0026] The first part is the cover part in the housing. The bypass part can be manufactured separately with the first part. During the design and manufacturing process, a cover structure that matches the existing water pump structure can be designed based on the rest of the existing water pump structure. There is no need to redesign and manufacture the entire water pump structure, which greatly shortens the production and manufacturing time and improves the installation and maintenance efficiency.

[0027] Preferably, the housing further includes a shielding sleeve, a magnet, and a coil. The shielding sleeve is disposed in the cavity of the second part and is sealed to the first part to form the mounting cavity. The rotating part is provided with a magnet. The coil is located outside the shielding sleeve and is installed inside the housing. The coil is used to drive the magnet to rotate the rotating part.

[0028] Based on the existing water pump structure, only a bypass channel and control valve need to be added to form a circulation loop that is independent of the original cold water loop of the hot water system.

[0029] This utility model also provides a hot water system, which includes an inlet pipe and a water heater, a hot water pipe, a water outlet, a return pipe, and a return water control valve that are connected in sequence to form a zero cold water circuit. A flow sensor is provided on the zero cold water circuit, and a heating device is provided at the heat exchange pipe of the water heater.

[0030] The hot water system also includes the water pump as described above. The inlet pipe and the zero cold water circuit are connected at the first connection point. The return water control valve, the first connection point, the inlet of the water pump, the outlet of the water pump, the heat exchange pipe, and the hot water pipe are sequentially arranged on the zero cold water circuit. The flow sensor is located outside the water pump.

[0031] When the control valve disconnects the circulation loop, the water pump can drive the water flow in the original zero-cold-water loop of the hot water system to achieve the effect of zero-cold-water.

[0032] Preferably, in the hot water system described above, the control valve is a solenoid valve, and the hot water system further includes a controller, which is electrically connected to the water pump and the control valve.

[0033] The control valve is set as a solenoid valve, which can form a low-latency control chain with the controller and sensor. When the controller receives the signal to open the circulation loop, it sends an electrical signal to the coil in the water pump and the control valve. After the coil is energized, it will drive the magnet to rotate the rotating part, and the control valve will open the valve port. The circulation loop is automatically opened in a short time and the technical effect of sewage discharge is achieved.

[0034] The significant advantages of this invention are as follows: By adding a bypass channel and a control valve to the water pump, the pump's mounting chamber and bypass channel can form a circulation loop independent of the original zero-cold-water loop of the hot water system. The control valve controls the opening and closing of this circulation loop. When the water pump is started, causing the rotating part to drive the bushing to rotate relative to the positioning shaft to prevent scale buildup between the bushing and the positioning shaft, the water agitated by the rotating part can flow through this circulation loop. This prevents the water agitated by the rotating part from flowing through the original zero-cold-water loop of the hot water system, thus avoiding triggering the heating sensor and causing the water heater to start. In other words, relative rotation between the positioning shaft and the bushing can be achieved without starting the heating device, achieving the technical effect of removing scale between the positioning shaft and the bushing (completing the drainage work) without causing user concerns about malfunction due to noise from the heating device. The control valve controls the opening and closing of the circulation loop, preventing interference with the water flow driven by the water pump in the hot water system within the zero-cold-water loop. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of a water pump according to an embodiment of the present invention.

[0036] Figure 2This is a schematic diagram of the internal water flow when the water pump participates in the zero cold water circuit B according to an embodiment of the present invention.

[0037] Figure 3 This is a schematic diagram of the internal water flow when the water pump starts the circulation loop A according to an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of a water pump according to an embodiment of the present invention.

[0039] Figure 5 This is a schematic diagram of a water pump according to an embodiment of the present invention.

[0040] Figure 6 This is a three-dimensional schematic diagram (a) of a water pump whose cover and bypass portion are integrally formed according to an embodiment of the present invention.

[0041] Figure 7 This is a three-dimensional schematic diagram (II) of a water pump whose cover and bypass portion are integrally formed according to an embodiment of the present invention.

[0042] Figure 8 This is a simplified diagram illustrating the working principle of a hot water system according to an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] Hot water system 1

[0045] Water heater 2

[0046] Water pump 10

[0047] 100 shell

[0048] Cover 110

[0049] Imported 1110

[0050] Exports 1120

[0051] Mounting cavity 120

[0052] Part Two, 130

[0053] Positioning axis 200

[0054] Bushing 300

[0055] Rotating part 400

[0056] Bypass channel 500

[0057] First paragraph 510

[0058] Second paragraph 520

[0059] Bypass section 600

[0060] Control valve 700

[0061] Valve stem 710

[0062] Shielding sleeve 800

[0063] Magnet 900

[0064] 1000 coils

[0065] Water inlet pipe 20

[0066] First connecting point 30

[0067] Return water control valve 40

[0068] Heat exchanger tube 50

[0069] Flow sensor 60

[0070] hot water pipe 70

[0071] Heating device 80

[0072] 90 with water end

[0073] Loop circuit A

[0074] Zero-cooled water loop B Detailed Implementation

[0075] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0076] Example 1

[0077] like Figures 1-7 As shown, this utility model provides a water pump 10, which includes: a housing 100, the housing 100 having an inlet 1110, a mounting cavity 120, and an outlet 1120 connected in sequence; a positioning shaft 200, fixed in the mounting cavity 120; a bushing 300, rotatably sleeved on the positioning shaft 200; a rotating part 400, which may be, but is not limited to, an impeller, disposed in the mounting cavity 120 and mounted on the bushing 300; the water pump 10 is provided with a bypass channel 500 and a control valve 700, the bypass channel 500 having a first opening and a second opening, the first opening, the mounting cavity 120, and the second opening being connected in sequence to form a circulation loop A (see details). Figure 3 The control valve 700 is located at the bypass channel 500 and is used to control the on / off state of the circulation loop A.

[0078] Specifically, in this embodiment, when the water pump 10 is operating normally (when the control valve 700 is closed), its rotating part 400 drives water through the inlet 1110 and the mounting cavity 120, and finally out of the outlet 1120. This is the internal water flow path of the water pump 10 when it participates in the original zero cold water circuit B of the hot water system 1. By adding a bypass channel 500 and a control valve 700 to the water pump 10, the mounting cavity 120 and the bypass channel 500 of the water pump 10 can form an independent zero cold water circuit B of the hot water system 1 (see details). Figure 8 The circulation loop A is formed by rotating part 400 driving bushing 300 to rotate around positioning shaft 200. This can drive water flow in circulation loop A. The water flow in circulation loop A circulates through inlet 1110, mounting cavity 120, valve port of control valve 700, and bypass channel 500. Water pump 10 controls the on / off state of circulation loop A through control valve 700. When the water pump 10 is started, causing the rotating part 400 to drive the bushing 300 to rotate relative to the positioning shaft 200 to prevent scale buildup between the bushing 300 and the positioning shaft 200, the water agitated by the rotating part 400 can flow through the circulation loop A. This prevents the water agitated by the rotating part 400 from flowing through the original cold water loop B of the hot water system 1, thus preventing the flow sensor 60 from triggering the heating device 80. In other words, in this embodiment, the water pump 10 can achieve relative rotation between the positioning shaft 200 and the bushing 300 without starting the heating device 80. This achieves the technical effect of removing scale between the positioning shaft 200 and the bushing 300 (completing the sewage discharge) without the heating device 80 making any noise that might cause user malfunction concerns. Furthermore, by setting the control valve 700 to control the opening and closing of the circulation loop A, interference with the water flow driven by the water pump 10 in the hot water system 1 in the cold water loop B can be avoided.

[0079] like Figures 1-7 As shown, in this embodiment, the bypass channel 500 includes at least a first section 510. The first section 510, the valve stem 710 of the control valve 700, and the positioning shaft 200 are arranged in parallel. The valve stem 710 extends into the first section 510 to disconnect the circulation loop A.

[0080] By arranging the first segment 510 of the bypass channel 500 parallel to the valve stem 710 of the control valve 700, the valve stem 710's closing of the bypass channel 500 is facilitated by a simple, straight structure, effectively reducing design and manufacturing complexity. In actual machining and installation, the positioning shaft 200 is generally parallel to the horizontal direction. Setting the first segment 510 and the valve stem 710 parallel to the positioning shaft 200 makes machining the first segment 510 and installing the control valve 700 more convenient.

[0081] like Figures 1-7As shown, in this embodiment, the inlet 1110 of the water pump 10 is oriented at a 90-degree angle to the outlet 1120 of the water pump 10. The extension direction of the first segment 510 is parallel to the orientation of the inlet 1110. The bypass channel 500 also includes a second segment 520. The two ends of the second segment 520 are respectively connected to the inlet 1110 and the first segment 510. The second segment 520 extends along the orientation of the outlet 1120.

[0082] The outlet 1120 of the water pump 10 is set at a 90-degree angle to the inlet 1110 of the water pump 10, that is, the outlet 1120 of the water pump 10 is perpendicular to the positioning shaft 200. At this time, the water flow is drawn out along the tangent direction of the rotation of the rotating part 400, which facilitates the improvement of the pumping effect of the water pump 10. The two ends of the second section 520 are connected to the first section 510 and the inlet 1110 respectively. The second section 520 extends along the outlet 1120. On the basis of facilitating the installation of the control valve 700, it can make the path of the independent circulation loop A shorter and the water flow resistance smaller, so that the water flow is easier to flow through the circulation loop A during sewage discharge, further reducing the risk of starting the heating device 80 of the water heater.

[0083] like Figures 1-7 As shown, in this embodiment, the inlet 1110 is oriented at a 90-degree angle to the outlet 1120, and the inlet 1110 is oriented parallel to the positioning axis 200.

[0084] The outlet 1120 of the water pump 10 is set at a 90-degree angle to the inlet 1110, and the positioning shaft 200 is set parallel to the inlet 1110. That is, the outlet 1120 of the water pump 10 is perpendicular to the positioning shaft 200. At this time, the rotating part 400 guides the water flow along the tangent direction of the rotation of the rotating part 400 to the outlet 1120 of the water pump 10, which facilitates the improvement of the pumping effect of the water pump 10.

[0085] like Figures 1-7 As shown, in this embodiment, the control valve 700 and the bypass channel 500 are disposed outside the housing 100, and the housing 100 forms an installation cavity 120 inside.

[0086] The newly added control valve 700 and bypass channel 500 are set outside the housing 100 of the water pump 10, without involving changes to the internal structure and related parts of the original water pump 10. The design and processing costs of the new mold are relatively low during production.

[0087] like Figures 1-7 As shown, in this embodiment, the water pump 10 is also provided with a bypass section 600, and a bypass channel 500 is formed in the bypass section 600. The bypass section 600 and the portion of the housing 100 that forms the inlet 1110 and the outlet 1120 are integrally formed.

[0088] In this embodiment, the water pump 10 adopts a design in which the bypass part 600 and the part forming the inlet 1110 and outlet 1120 in the housing 100 are integrally formed. Compared with the split solution, it has higher sealing reliability, is less prone to joint cracking, and simplifies the assembly process.

[0089] like Figures 1-7 As shown, in this embodiment, the housing 100 includes a first part 110 and a second part 130. An inlet 1110 and an outlet 1120 are disposed on the first part. A bypass part 600 is integrally formed with the first part. The second part has a cavity to accommodate the rotating part 400. The first part covers the opening of the cavity of the second part and surrounds it to form an installation cavity 120.

[0090] In the water pump 10 of this embodiment, the first part 110, namely the cover 110 part in the housing 100, has a bypass part 600 that can be manufactured separately with the first part. During the design and manufacturing process, a cover structure that matches the existing structure of the water pump 10 can be designed based on the rest of the existing structure, without having to redesign and manufacture the entire structure of the water pump 10, which greatly shortens the production and manufacturing time and improves the installation and maintenance efficiency.

[0091] like Figures 1-7 As shown, in this embodiment, the housing 100 is further provided with a shielding sleeve 800, a magnet 900 and a coil 1000. The shielding sleeve 800 is disposed in the cavity of the second part and is sealed with the first part to form an installation cavity 120, so that water can only flow in the installation cavity 120. The rotating part 400 is provided with a magnet 900. The coil 1000 is located outside the shielding sleeve 800 and is installed in the housing 100. The coil 1000 is used to drive the magnet 900 to drive the rotating part 400 to rotate.

[0092] Based on the existing water pump 10, only a bypass channel 500 and a control valve 700 need to be added to form a circulation loop A that is independent of the original cold water loop B of the hot water system.

[0093] like Figure 8As shown, this utility model also provides a hot water system 1, which includes an inlet pipe 20 and a water heater 2, a hot water pipe 70, a water outlet 90, a return pipe, and a return water control valve 40 that are sequentially connected to form a zero cold water circuit B. The water heater 2 is a gas water heater, and a water pump is installed in the water heater. A flow sensor 60 is provided on the zero cold water circuit B. In this embodiment, the flow sensor 60 is located downstream of the return water control valve 40. A heating device 80 is provided at the heat exchange pipe 50 of the water heater. The hot water system 1 also includes the water pump 10 as described above. The inlet pipe 20 and the zero cold water circuit B are connected at a first connection point 30. The return water control valve 40, the first connection point 30, the inlet 1110 of the water pump 10, the outlet 1120 of the water pump 10, the heat exchange pipe 50, and the hot water pipe 70 are sequentially arranged on the zero cold water circuit B. The flow sensor 60 is located outside the water pump 10.

[0094] When the control valve 700 in the water pump 10 disconnects the circulation loop A, the water pump 10 can drive water to flow in the zero-cold-water loop B to achieve the effect of zero-cold-water. In this embodiment, the flow sensor 60 is located upstream of the water pump 10. In other embodiments, the designer can flexibly set the flow sensor 60 in other locations in the hot water system 1 other than the water pump 10 according to the actual circuit structure and usage requirements. This part belongs to the prior art in this field and will not be described in detail here.

[0095] Specifically, in the hot water system 1 of this embodiment, the control valve 700 is a solenoid valve. The hot water system 1 also includes a controller (not shown in the figure), which is electrically connected to the water pump 10 and the control valve 700.

[0096] By setting the control valve 700 as a solenoid valve, a control chain with low latency can be formed with the controller and flow sensor 60. In this embodiment, the controller is specifically electrically connected to the coil 1000 in the water pump 10. When the controller receives the instruction to open the circulation loop A, it controls the coil 1000 to drive the magnet 900 to rotate the rotating part 400, and controls the control valve 700 to retract the valve stem 710 from the first section 510, so that the circulation loop A is connected. The circulation loop A is automatically opened in a short time and the technical effect of sewage discharge is achieved.

Claims

1. A water pump for a water heater, comprising: A housing having an inlet, a mounting cavity, and an outlet connected in sequence; The positioning shaft is fixed inside the mounting cavity; A bushing is rotatably fitted onto the positioning shaft; A rotating part is disposed within the mounting cavity and mounted on the bushing; The water pump is characterized in that it is provided with a bypass channel and a control valve. The bypass channel has a first opening and a second opening. The first opening, the mounting cavity and the second opening are connected in sequence to form a circulation loop. The control valve is located at the bypass channel and is used to control the opening and closing of the circulation loop.

2. The water pump as described in claim 1, characterized in that, The bypass channel includes at least a first section, the first section, the valve stem of the control valve, and the positioning shaft are arranged in parallel, and the valve stem extends into the first section to disconnect the circulation loop.

3. The water pump as described in claim 2, characterized in that, The inlet of the water pump is oriented at a 90-degree angle to the outlet of the water pump. The extension direction of the first segment is parallel to the orientation of the inlet. The bypass channel also includes a second segment, the two ends of which are respectively connected to the inlet and the first segment. The second segment extends along the orientation of the outlet.

4. The water pump as described in claim 1, characterized in that, The inlet orientation is set at a 90-degree angle to the outlet orientation, and the inlet orientation is set parallel to the positioning axis.

5. The water pump as described in claim 1, characterized in that, The control valve and the bypass channel are disposed on the outside of the housing, and the mounting cavity is formed inside the housing.

6. The water pump as described in claim 5, characterized in that, The water pump is also provided with a bypass section, the bypass channel is formed in the bypass section, and the bypass section and the portion of the housing that forms the inlet and the outlet are integrally formed.

7. The water pump as described in claim 6, characterized in that, The housing includes a first part and a second part. The inlet and the outlet are disposed on the first part. The bypass part is integrally formed with the first part. The second part has a cavity to accommodate the rotating part. The first part covers the opening of the cavity of the second part and surrounds it to form the mounting cavity.

8. The water pump as described in claim 7, characterized in that, The housing also includes a shielding sleeve, a magnet, and a coil. The shielding sleeve is disposed in the cavity of the second part and is sealed to the first part to form the mounting cavity. The rotating part is provided with a magnet. The coil is located outside the shielding sleeve and is installed inside the housing. The coil is used to drive the magnet to rotate the rotating part.

9. A hot water system, the hot water system comprising an inlet pipe and a water heater, a hot water pipe, a water outlet, a return pipe, and a return water control valve that are sequentially connected to form a zero cold water circuit, wherein a flow sensor is provided on the zero cold water circuit and a heating device is provided at the heat exchange tube of the water heater; Its features are, The hot water system further includes a water pump as described in any one of claims 1 to 8, the inlet pipe and the zero cold water circuit are connected at a first connection point, the return water control valve, the first connection point, the inlet of the water pump, the outlet of the water pump, the heat exchange pipe and the hot water pipe are sequentially arranged on the zero cold water circuit, and the flow sensor is located outside the water pump.

10. The hot water system as described in claim 9, characterized in that, The control valve is a solenoid valve, and the hot water system also includes a controller, which is electrically connected to the water pump and the control valve. And / or, the water pump is installed inside the water heater; And / or, the water heater is a gas water heater.

Images