Low-voltage permanent magnet brushless shielding type mute water pump

Abstract

The utility model relates to a low-voltage permanent magnet brushless shielding type mute water pump. The water pump comprises a driving motor, a pump shell and a control box. The driving motor is powered by low voltage and comprises a motor barrel, a stator arranged in the motor barrel, a rotor arranged in the stator, a stainless steel shielding sleeve arranged between the stator and the rotor and an exhaust screw arranged at the tail part of the motor barrel, and the number of turns of a winding coil on a single tooth of a stator iron core is 25-75. The pump shell is arranged at the head of a motor barrel, and an impeller connected with a rotor is arranged in the pump shell. The control box is arranged on the side face of a motor barrel, a display control panel is arranged, a waterproof aviation plug is arranged on the side face of the control box, and a digital display area and a remote control window are arranged on the display control panel. Under the condition that the advantages of no leakage, ultra-silence and long service life of an existing metal shield pump are reserved, low-voltage power supply and glue pouring treatment of a charged part are adopted, and the number of turns of the stator winding coil is reasonably designed, so that the power and safety of the water pump can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a low-voltage permanent magnet brushless shielded silent water pump. Background Art

[0002] Existing all-metal shielded silent water pumps are mainly used for hot and cold water boosting and circulation in scenes such as kitchen and bathroom, water purifiers, solar energy, floor heating, and air energy dual supply. They usually use 110-240V high-voltage motors. This type of shielded water pump has the advantages of being silent, long life, no leakage, wide flow and power range, and resistant to high hot and cold water pressure. However, when the humidity of the working environment of this type of shielded water pump is high, condensation water is easy to generate on the motor stator and control board, which is easy to cause short circuit and leakage under the action of high voltage, and it is easy to cause explosion in places with high concentration of flammable gas, endangering personal and equipment safety. At the same time, the control box of this type of shielded water pump is usually set at the tail of the motor, so that there is no place to set the exhaust screw outside the motor, which is not only inconvenient to remove the gas inside the pipeline and the water pump, but also makes it difficult for installation and maintenance personnel to unlock the rotor when it is stuck.

[0003] Although the cheap 24V low-voltage brushless small water pumps on the market are safe to use and have a high level of protection, their main structural parts generally use injection molding technology, and the parts have low precision. In order to reduce the volume and save costs, a high-speed solution is adopted. In addition, the graphite bearings inside the injection-molded rotor are soft in texture, and the bearings wear quickly during high-speed rotation, resulting in high noise and short life of the water pump. At the same time, due to the small torque of high-speed water pumps, the rotors are prone to jamming after the bearings are worn eccentrically or the tap water is scaled. Due to mechanical shortcomings and other limitations, the actual power of this type of water pump is usually low, not exceeding 140W, and cannot meet the flow and pressure requirements of scenarios where multiple water points are used at the same time. At the same time, this type of plastic small water pump is prone to leaking when the water pressure is high or high-temperature hot water is used for a long time.

[0004] The above two types of water pumps are usually installed in cabinets, roofs, high-altitude air conditioner positions, pipe wells and other places that are difficult to reach and dirty. These two types of water pumps usually only have manual buttons or paddle knob adjustment functions, which requires operators to get close to the water pumps to adjust them, which is inconvenient. At the same time, these two types of water pumps usually do not have digital display functions, which makes it difficult for operators to understand the detailed working conditions of the water pumps and difficult to perform fault diagnosis and maintenance. Utility Model Content

[0005] The purpose of the utility model is to provide a low-voltage permanent magnet brushless shielded silent water pump, which can use low voltage power supply to improve the water outlet pressure and power of the water pump while retaining the performance advantages of the existing metal shielded pump such as no leakage, ultra-quiet and long life, thereby greatly expanding the scope and scenarios of application; retaining the exhaust screw at the tail of the motor barrel to facilitate the exhaust of the water pump and the unlocking operation of the rotor after it is stuck due to scale; facilitating the operator to understand the working status of the water pump in detail and intuitively, and facilitating fault diagnosis and maintenance; the water pump has a remote control function, which is convenient for the operator to adjust the status of the water pump.

[0006] In order to achieve the above object, the utility model provides a low-voltage permanent magnet brushless shielded silent water pump, comprising:

[0007] The driving motor is powered by a low voltage of 72V or less, and includes a motor barrel, a stator arranged in the motor barrel, a rotor arranged in the stator, a stainless steel shielding sleeve arranged between the stator and the rotor, and an exhaust screw arranged at the tail of the motor barrel. The driving motor is a six-slot four-pole motor or a nine-slot six-pole motor. The number of turns of the winding coil on a single tooth of the stator core connected in star shape is 25 turns to 55 turns, and the number of turns of the winding coil on a single tooth of the stator core connected in triangle shape is 25 turns to 75 turns.

[0008] A pump housing is arranged at the head of the motor barrel, an impeller is arranged in the pump housing, and the impeller is connected to the rotor;

[0009] A control box is arranged on the side of the motor barrel. A variable frequency motor drive board and a display control panel are arranged in the control box. A digital display area and a remote control window are arranged on the display control panel.

[0010] Optionally, the outer diameter of the stator core is 71mm-84mm, the inner diameter of the stator core is 25mm-44mm, the stack height of the stator core is 20mm-62mm, the wire diameter of the stator winding coil is 0.4mm-2mm, and the stator winding coil can be a single strand or multiple strands of equal cross-section.

[0011] Optionally, the digital display area can display power, speed, head, flow value or fault code.

[0012] Optionally, the remote control window can be infrared remote control or Bluetooth, wifi, zigbee remote control.

[0013] Optionally, the stator and the live parts in the control box are filled with glue or coated with glue.

[0014] Optionally, a waterproof power cord with a nut seal connected to the motor variable frequency drive board and a waterproof aviation plug used as an external signal interface are provided on the side of the control box.

[0015] Optionally, the outer diameter of the impeller is 48mm-85mm, the diameter of the impeller suction port is 16mm-31mm, and the number of impeller blades is 5, 7 or 9.

[0016] Optionally, the display control panel also includes a gear indicator light, a gear switch button for manually switching gears, a mode indicator light and a fault light.

[0017] Optionally, the drive motor further includes:

[0018] A ceramic shaft is arranged on the rotor, a ceramic bearing is arranged between one end of the ceramic shaft and the stainless steel shielding sleeve, and a bearing cover plate is arranged at the other end of the ceramic shaft;

[0019] A thrust bearing is arranged between the rotor and the bearing cover plate.

[0020] Optionally, a heat dissipation cover is provided on the control box.

[0021] The beneficial effects of the utility model are: while retaining the performance advantages of the existing metal shielded pump such as no leakage, ultra-quiet and long life, it adopts low-voltage power supply, and through the reasonable design of the number of turns of the stator winding coil, while ensuring low-voltage safety, the water outlet pressure and power of the water pump are improved. The maximum power of the water pump can reach 350W, and the head can exceed 25 meters, which greatly expands the scope and scenarios of application; by setting the control box on the side of the drive motor and retaining the exhaust screw at the tail of the motor barrel, it is convenient to exhaust the water pump and unlock the rotor after it is stuck due to scale; by setting a digital display area on the display control panel, parameters such as power, speed, head, flow or fault code can be displayed, which is convenient for the operator to understand the working status of the water pump in detail and intuitively, and facilitate fault diagnosis and maintenance; by setting a remote control window on the display control panel, the water pump realizes the remote control function, which is convenient for the operator to adjust the state of the water pump.

[0022] The protection level of the water pump can be improved by filling or coating the stator and the live parts in the control box with glue.

[0023] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic exploded view of a low-voltage permanent magnet brushless shielded silent water pump shown in one embodiment of the utility model;

[0025] Figure 2This is a schematic structural diagram of a display control panel of a low-voltage permanent magnet brushless shielded silent water pump shown in an embodiment of the utility model;

[0026] Figure 3 This is a first schematic structural diagram of a flow switch of a low-voltage permanent magnet brushless shielded silent water pump shown in an embodiment of the utility model;

[0027] Figure 4 A second schematic structural diagram of a flow switch of a low-voltage permanent magnet brushless shielded silent water pump shown in an embodiment of the utility model;

[0028] Figure 5 A schematic position relationship diagram of a display control panel and an exhaust screw of a low-voltage permanent magnet brushless shielded silent water pump shown in an embodiment of the utility model;

[0029] In the figure: 1. Drive motor; 11. Motor barrel; 12. Stator; 13. Rotor; 14. Stainless steel shielding sleeve; 15. Exhaust screw; 16. Ceramic shaft; 17. Ceramic bearing; 18. Thrust bearing; 19. Bearing cover; 2. Pump casing; 21. Impeller; 22. One-inch thread; 23. Six-point thread; 3. Control box; 31. Display control panel; 311. Digital display area; 312. Remote control window; 313. Gear indicator light; 314. Gear switch button; 315. Mode indicator light; 316. Fault light; 32. Waterproof aviation plug; 33. Heat sink cover; 4. Flow switch; 41. External flow switch; 42. Built-in flow switch. DETAILED DESCRIPTION

[0030] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] See also Figure 1 and Figure 2 A low-voltage permanent magnet brushless shielded silent water pump shown in a preferred embodiment of the present application includes a drive motor 1, a pump housing 2 and a control box 3. The drive motor 1 is powered by a low voltage below 72V, and includes a motor barrel 11, a stator 12 arranged in the motor barrel 11, a rotor 13 arranged in the stator 12, a stainless steel shielding sleeve 14 arranged between the stator 12 and the rotor 13 for isolating the stator 12 and the rotor 13, and an exhaust screw 15 arranged at the tail of the motor barrel 11. The drive motor 1 is a six-slot four-pole or nine-slot six-pole motor. The number of turns of the winding coil on a single tooth of the stator 12 iron core connected in star shape is 25 turns to 55 turns, and the number of turns of the winding coil on a single tooth of the stator 12 iron core connected in triangle shape is 25 turns to 75 turns. The pump housing 2 is arranged at the head of the motor barrel 11, and an impeller 21 is arranged in the pump housing 2, and the impeller 21 is connected to the rotor 13. The control box 3 is arranged on the side of the motor barrel 11 . A variable frequency motor drive board and a display control panel 31 are arranged in the control box 3 . A digital display area 311 and a remote control window 312 are arranged on the display control panel 31 .

[0034] It should be noted here that the number of turns of the stator 12 winding coil is defined as the number of turns of the coil in the electromagnetic design sense of the drive motor 1, rather than the number of turns in the daily sense. For thicker coils, if the number of turns remains unchanged, multiple strands of wire can be used and short-circuited around the ends to achieve the same effect.

[0035] According to the scheme of the embodiment of the utility model, while retaining the performance advantages of the existing metal shielded pump such as no leakage, ultra-quiet and long life, low voltage power supply is adopted, and by reasonably designing the number of turns of the stator 12 winding coil, while ensuring low-voltage safety, the speed of the drive motor 1 and the water outlet pressure and power of the water pump can be increased, and the original water pump power of about 100 watts is increased to a maximum of 350W, and the head can exceed 25 meters, which greatly expands the scope and scenarios of application; by setting the control box 3 on the side of the drive motor 1, the exhaust screw 15 at the tail of the motor barrel 11 is retained, which is convenient for the exhaust of the water pump and the unlocking operation of the rotor 13 after it is stuck due to scale; by setting a digital display area 311 on the display control panel 31, parameters such as power, speed, head, flow or fault code can be displayed, which is convenient for the operator to understand the working status of the water pump in detail and intuitively, and facilitate fault diagnosis and maintenance; by setting a remote control window 312 on the display control panel 31, the water pump realizes the remote control function, which is convenient for the operator to adjust the state of the water pump.

[0036] The following is a detailed description with specific embodiments:

[0037] Usually, the winding coil wire diameter of the high-voltage motor stator 12 is relatively thin, and the number of turns of the winding coil is about several hundred to more than one thousand turns, and the maximum current, maximum speed and power are generally not high. In this embodiment, the number of turns and wire diameter of the stator 12 winding coil of the low-voltage drive motor 1 are different, the maximum current can reach 6-10A, the maximum speed can exceed 10000rpm, and the maximum power can reach 350W. Specifically, the wire diameter of the stator 12 winding coil of the present application is 0.4mm-2mm. By increasing the wire diameter of the stator 12 winding coil or the number of strands of wire wound, the resistance and heat loss during operation can be reduced.

[0038] Specifically, in this embodiment, the water pump adopts 12-72V low-voltage DC power supply, and the power range is 0-350W. The outer diameter of the stator 12 core is 71mm-84mm, the inner diameter of the stator 12 core is 25mm-44mm, the stack height of the stator 12 core is 20mm-62mm, and the stator winding coil can be a single strand or multiple strands of equal cross-section. The diameter of the rotor 13 is 25mm-44mm, the rotation speed is 3200-10000rpm, and can be a stainless steel pipe with a wall thickness of 0.05mm-0.2mm, or a ferrite, neodymium iron boron or samarium iron nitrogen magnet with surface spray protection.

[0039] See also Figure 1The drive motor 1 further includes a ceramic shaft 16 and a thrust bearing 18. The ceramic shaft 16 is arranged on the rotor 13. A ceramic bearing 17 is arranged between one end of the ceramic shaft 16 and the stainless steel shielding sleeve 14, and a bearing cover plate 19 is arranged at the other end. The thrust bearing 18 is arranged between the rotor 13 and the bearing cover plate 19. Specifically, the diameter of the ceramic shaft 16 is 8mm-13mm.

[0040] See also Figure 1 The outer diameter of the impeller 21 is 48mm-85mm, the diameter of the suction port of the impeller 21 is 16mm-31mm, and the number of blades of the impeller 21 is 5, 7 or 9. The head of the water pump is increased by increasing the outer diameter of the impeller 21 and reducing the diameter of the suction port of the impeller 21. Specifically, in this embodiment, at a power of 180W, the maximum head of the water pump can be increased to 22-35m.

[0041] See also Figure 3 and Figure 4 , the control box 3 is provided with a waterproof power cord with a nut seal connected to the motor variable frequency drive board and a waterproof aviation plug 32 used as an external signal interface on the side. Specifically, when the water pump of the present application is used as a circulating pump, the waterproof aviation plug 32 can be used as a communication line connector between the host computer and the control box 3 for signal transmission. When the water pump of the present application is used as a booster pump, a flow switch 4 is provided at the outlet of the pump housing 2, and the flow switch 4 can be connected to the control box 3 through the waterproof aviation plug 32. In this embodiment, the flow switch 4 includes an external flow switch 41 or a built-in flow switch 42 at the outlet of the pump housing 2, and the waterproof aviation plug 32 adopts a GX12 or GX16 model. The outlet end of the pump housing 2 is provided with a one-inch thread 22 or a six-point thread 23.

[0042] See also Figure 1 and Figure 5 The display control panel 31 is located on the control box 3 and is parallel to the end surface of the exhaust screw 15 at the tail of the motor barrel 11, so as to be directly facing the user for convenient operation and adjustment. Figure 2 The display control panel 31 also includes a gear indicator light 313, a gear switch button 314 for manually switching gears, a mode indicator light 315, and a fault light 316. Specifically, in this embodiment, the gear indicator light 313 includes 1 to 3 gears. When the gear switch button 314 is pressed, the corresponding gear indicator lights 313 of different gears light up. The mode indicator light 315 includes a constant speed mode light, a constant pressure mode light, a proportional mode light, and an automatic mode light. A signal receiving terminal is provided on the inner circuit board of the control box 3 corresponding to the display control panel 31. The mode switching is adjusted by sending a signal to the display control panel 31 through a remote control device. For example, when switching to automatic mode, the automatic mode light lights up.

[0043] The digital display area 311 can display parameters such as power, speed, head, flow value or fault code, which is convenient for operators to understand the working state of the water pump in detail and intuitively, and is convenient for fault diagnosis and maintenance. Specifically, in the present embodiment, the digital display area 311 is a three-digit segmented display area. The digital display area 311 displays the current power of the water pump by default, and uses a remote control device to send a signal to the display control panel 31, and can selectively display state parameters such as power, head, flow or speed. When the water pump has a short circuit, overcurrent, overheating, water shortage or other faults, the fault light 316 lights up, and displays fault codes such as E0-E9 and F0-FF in the digital display area 311 for reminder. Each segment of the digital display area 311 is composed of light-emitting diodes, and the film in the gear switching button 314 and the remote control window 312 is constructed as an elastic film, so that the button or switch element located under the film can be operated. The button or switch element and the light-emitting diode are all arranged on the circuit board on the inner side of the control shell, and the film is arranged on the outer wall of the control box 3.

[0044] The remote control window 312 can be remotely controlled by infrared, Bluetooth, wifi, or zigbee. When infrared remote control is used, the user sends infrared signals to the display control panel 31. Since the infrared wavelength is relatively long, the reception effect is better when the display control panel is wet or dirty. When Bluetooth, wifi, or zigbee protocol remote control is used, the display control panel 31 is made of a film material with high transparency, which facilitates signal penetration and is received by the signal receiving end.

[0045] See also Figure 1 , a heat dissipation cover 33 is provided on the control box 3. Specifically, in this embodiment, the heat dissipation cover 33 is made of aluminum alloy. The stator 12 and the live parts in the control box 3 are filled with glue or coated with glue, which can improve the protection level of the water pump. Specifically, in this embodiment, silicone, epoxy or other similar sealing and insulating glue can be used for filling with glue.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A low-voltage permanent magnet brushless shielded silent water pump, characterized in that: include: The driving motor is powered by a low voltage of 72V or less, and includes a motor barrel, a stator arranged in the motor barrel, a rotor arranged in the stator, a stainless steel shielding sleeve arranged between the stator and the rotor, and an exhaust screw arranged at the tail of the motor barrel. The driving motor is a six-slot four-pole motor or a nine-slot six-pole motor. The number of turns of the winding coil on a single tooth of the stator core connected in star shape is 25 turns to 55 turns, and the number of turns of the winding coil on a single tooth of the stator core connected in triangle shape is 25 turns to 75 turns. A pump housing is arranged at the head of the motor barrel, an impeller is arranged in the pump housing, and the impeller is connected to the rotor; A control box is arranged on the side of the motor barrel. A variable frequency motor drive board and a display control panel are arranged in the control box. A digital display area and a remote control window are arranged on the display control panel.

2. The low-voltage permanent magnet brushless shielded silent water pump according to claim 1 is characterized in that: The outer diameter of the stator core is 71mm-84mm, the inner diameter of the stator core is 25mm-44mm, the stack height of the stator core is 20mm-62mm, the wire diameter of the stator winding coil is 0.4mm-2mm, and the stator winding coil can be a single strand or multiple strands of the same cross-section.

3. The low-voltage permanent magnet brushless shielded silent water pump according to claim 2 is characterized in that: The digital display area can display power, rotation speed, head, flow value or fault code.

4. The low-voltage permanent magnet brushless shielded silent water pump according to claim 3 is characterized in that: The remote control window can be infrared remote control or bluetooth, wifi, zigbee remote control.

5. The low-voltage permanent magnet brushless shielded silent water pump according to claim 4 is characterized in that: The stator and the live parts in the control box are processed by glue filling or glue coating.

6. The low-voltage permanent magnet brushless shielded silent water pump according to claim 5 is characterized in that: The side of the control box is provided with a waterproof power line with a nut seal connected to the motor variable frequency drive board and a waterproof aviation plug used as an external signal interface.

7. The low-voltage permanent magnet brushless shielded silent water pump according to claim 6 is characterized in that: The outer diameter of the impeller is 48mm-85mm, the diameter of the impeller suction port is 16mm-31mm, and the number of impeller blades is 5, 7 or 9.

8. The low-voltage permanent magnet brushless shielded silent water pump according to claim 1 is characterized in that: The display control panel also includes a gear indicator light, a gear switching button for switching gears, a mode indicator light and a fault light.

9. The low-voltage permanent magnet brushless shielded silent water pump according to claim 1 is characterized in that: The drive motor also includes: A ceramic shaft is arranged on the rotor, a ceramic bearing is arranged between one end of the ceramic shaft and the stainless steel shielding sleeve, and a bearing cover plate is arranged at the other end of the ceramic shaft; A thrust bearing is arranged between the rotor and the bearing cover plate.

10. The low-voltage permanent magnet brushless shielded silent water pump according to claim 6, characterized in that: The control box is provided with a heat dissipation cover.

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