CN104061171A - Water circulating system and centrifugal water pump - Google Patents
Water circulating system and centrifugal water pump Download PDFInfo
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- CN104061171A CN104061171A CN201410270812.8A CN201410270812A CN104061171A CN 104061171 A CN104061171 A CN 104061171A CN 201410270812 A CN201410270812 A CN 201410270812A CN 104061171 A CN104061171 A CN 104061171A
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Abstract
The invention discloses a water circulating system and a centrifugal water pump. The centrifugal water pump comprises a pump head, wherein a water outlet is formed in the pump head, a water flow sensing switch is arranged in the water outlet and the water flow sensing switch feeds back water flow signals to a control circuit board. The water circulating system comprises the centrifugal pump, a water source end, a user water outlet end, a one-way valve and a water heater, wherein the water source end is respectively connected with a water inlet end of the water heater and a cold water outlet pipe of the user water outlet end, a water outlet end of the water heater is connected with a water inlet pipe of the centrifugal water pump and the water outlet of the centrifugal pump is connected with a hot water outlet pipe of the user water outlet end; the user water outlet end is connected with a water inlet end pipe of the water heater; a branch pipe is further arranged on a pipe between the centrifugal water pump and the hot water outlet of the user water outlet end, and the branch pipe is connected to a pipe between the water source end and the cold water outlet of the user water outlet end through the one-wavy valve. The water circulating system and the centrifugal water pump have the advantage that the remote control of the centrifugal water pump can be realized.
Description
Technical field
The invention belongs to water pump field, be specifically related to a kind of water circulation system and centrifugal water pump.
Background technique
Centrifugal water pump is mainly widely used in the water circulation system in people's life, conventionally uses centrifugal water pump to be used for the occasion of various needs circulations, such as the hot water circuit on household ground heating, boiler circulation, the circulation of water heater cold water pipe.Existing centrifugal water pump is merely able to make centrifugal water pump open or cut out by artificial operation on centrifugal water pump conventionally; If all need artificial going to control when each opening and closing, waste a large amount of time, therefore impracticable; Therefore design a kind of can being necessary by the centrifugal water pump of telecontrol.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides and can pass through a kind of water circulation system and the centrifugal water pump of telecontrol.
The present invention has adopted following technological scheme: a kind of centrifugal water pump, this centrifugal water pump comprises the pump housing and control gear, control gear is arranged on a side of the pump housing and one end is provided with power supply unit and control gear inside is provided with control circuit board, control circuit board contains delay switch circuit, and delay switch circuit is for carrying out disable motor according to setting value; The machine barrel that the pump housing comprises pump head and matches with pump head, pump body is provided with motor, by motor-driven impeller; Described motor is started by control gear control; Described pump head is provided with water outlet; In described water outlet, be provided with current induction switch, described current induction switch feeds back to water-flow signal in control circuit board.
Adopt this structure, install after centrifugal water pump, because user's tap of fetching boiling water makes the water in centrifugal water pump water outlet start to flow, cause current induction switch to be touched, current induction switch passes the signal along to while shake-up to be controlled motor in the control circuit board of control gear and comes into operation, and finally makes centrifugal water pump start working; In the time of user's closed tap, induction switch stops operating, and water pump quits work.Closing the time that also can preset running on control circuit board of centrifugal water pump, in the time that water tap is opened, water pump is started working, and the running time, while reaching predefined value, water pump quit work.
Wherein, described water outlet is provided with the current induction switch upper cover coordinating with pump head, and current induction switch upper cover lower end coordinates with pump head fixing seal, and current induction switch upper cover upper end is stretched in control gear.
Wherein, described current induction switch comprises water switch impeller, is fixed on the magnetic devices of water switch impeller top; Described water switch wheel rotation is arranged on pump head water outlet, and magnetic devices is arranged in current induction switch upper cover; In control gear, be provided with Hall element, when water switch wheel rotation, Hall element passes the signal along in control circuit board according to changes of magnetic field.
Adopt the current induction switch of this structure, make the induction of current induction switch more sensitive; In the time of water movement in water outlet, drive water switch wheel rotation, therefore magnet also and then rotates, thereby cause magnetic field to change, Hall element is in the time sensing changes of magnetic field, by signal feed back in control circuit board, control circuit board control motor comes into operation, thereby centrifugal water pump is started working, when water tap is closed, water switch wheel rotor differential water pressures is around 0, and water switch wheel rotor just can not rotate, and therefore centrifugal water pump quits work, or when water pump operation reaches predefined value, control gear forces to stop pump working.
Wherein, described machine barrel adopts BMC material once injection moulding, and pump head adopts plastic materials disposal molding.
Machine barrel employing BMC material disposal molding motor encapsulation technology makes the inductance loop seclusion of machine barrel and motor, and its structural design of good seal performance is simple, BMC/DMC.A kind of superior insulating material, good electrical properties, mechanical property, heat resistance, chemical resistance, high flame resistance and withstand voltage properties, solve motor and easily make moist, corrosion, water inlet, not resistance to high temperature, motor burns out, and water pump can be used under any rugged environment.Greatly improve working life.
Wherein, described current induction switch is arranged on the fixed support in pump head water outlet; In described fixed support, slide and be provided with magnetic devices; One end of described magnetic devices and support bracket fastened one end offset by spring; In described current induction switch upper cover, be provided with Hall element; Current by time magnetic devices because the effect of current is compressed near Hall element, Hall element passes the signal along in control circuit board according to changes of magnetic field.
Adopt the current induction switch of this structure, make the induction of current induction switch more sensitive; When water movement in water outlet, drive magnetic devices Compress Spring, near magnetic devices is compressed to Hall element, thereby cause magnetic field to change, Hall element is in the time sensing changes of magnetic field, by signal feed back in control circuit board, control circuit board control motor comes into operation, thereby centrifugal water pump is started working.
Wherein, described magnetic devices is permanent magnetic iron.
Adopt permanent magnetic iron as magnetic devices to be because permanent magnetism magnetic is strong and stable.
Wherein, described control gear comprises frequency-variable controller, described frequency-variable controller control motor.In life using process, usually there will be hot water in the process of opening, open cold water water tap, the hydraulic pressure of hot water can diminish, and the rotating speed that therefore utilizes frequency variator to improve motor can effectively avoid this hydraulic pressure to become situation about diminishing greatly.
Wherein, the rotor of described motor is arranged in housing, and housing is provided with capping, and the axle of rotor coordinates with impeller through capping; Housing inside is provided with runner, and capping is provided with the discharge orifice of runner, and runner is provided with filter screen; Described pump head inside is provided be interconnected water-inlet cavity and water chamber, between water-inlet cavity and water chamber, is provided with mounting groove; Secure fit pump head capping in mounting groove; One end of described impeller is connected with the rotor of motor, and the other end stretches in pump head and is rotating with pump head capping, and pump head capping and pump head adopt ultrasonic welding, are convenient to the production of whole water pump.
Housing adopts this structure can facilitate the water of part to enter housing inside and plays effect lubricated, cooling motor rotor; Adopt the setting of filter screen, the effect that prevents magnet on stator is adsorbed on some magazines in water on the sidewall of housing and causes that rotor is stuck; Adopt this structure can promote water pump working life.
Wherein, described power supply input device comprises Chinese character pin-shaped socket and plug, and socket is positioned on control gear, and the bottom surface of socket is provided with inserted sheet; Described plug comprises the plug overcoat and the plug inner sleeve that are each other dismantled and assembled cooperation; The inner cavity that forms of plug inner sleeve and plug overcoat, cavity inside is provided with terminal plastic, terminal, contact disk; It is dismantled and assembled fixing that the inwall of terminal plastic and plug inner sleeve is; Terminal is located at terminal plastic inside; One end of terminal is connected with power line; The joint that contact disk comprises and clamping part; Joint is connected with terminal, and retaining part is in jack; Plug overcoat one end face offers tapped hole, and tapped hole is common to mutually power line with cavity and stretches into; This structure also comprises the thread head coordinating with tapped hole; The outer wall of plug inner sleeve is provided with waterproof ring; Described plug also comprises power line and plug sealing configuration, and sealing structure comprises wire clamp, rubber ring; Thread head is provided with endoporus, and wire clamp is located in the endoporus of thread head, and wire clamp comprises movable I portion, movable II portion, and movable I portion, movable II portion is circle distribution and interval arranges; Rubber ring below wire clamp between thread head and plug outer casing inner wall; In described plug, put and be provided with sealing gasket, in the time that plug inner sleeve is inserted plug overcoat, the cavity wall of the sealing gasket above plug inner sleeve and plug overcoat is close to formation sealing.
Adopt this plug and socket, the firstth, consider that people position in the time that centrifugal water pump is set differs, and adopt this structure, even centrifugal water pump from power supply away from time also can complete by wiring, make up the defect that plug in prior art cannot wiring, and above-mentioned several sealing configurations, make the water-proof performance grow of plug, go in moister environment.
A kind of circulation, comprises centrifugal water pump, and this circulation also comprises water source end, user waterexit end, one-way valve, water heater; Described water source end is connected with the feed-water end of water heater and the cooling water outlet pipeline of user waterexit end respectively, and the waterexit end of water heater is connected with the water intake pipeline of centrifugal water pump, and the water outlet of centrifugal water pump is connected with the hot water outlet pipeline of user waterexit end; User's output terminal is connected with the feed-water end pipeline of water heater; On pipeline between the hot water outlet of centrifugal water pump and user waterexit end, be also provided with a lateral, this lateral is connected on the pipeline between water source end and the cooling water outlet of user waterexit end by one-way valve.
A kind of circulation, comprises centrifugal water pump, and this circulation also comprises water source end, user waterexit end, water heater; Described water source end is connected with the feed-water end of water heater and the cooling water outlet pipeline of user waterexit end respectively, and the waterexit end of water heater is connected with the water intake pipeline of centrifugal water pump, and the water outlet of centrifugal water pump is connected with the hot water outlet pipeline of user waterexit end; User's output terminal is connected with the feed-water end pipeline of water heater; On pipeline between the hot water outlet of centrifugal water pump and user waterexit end, be also provided with a lateral, this lateral is connected on the pipeline between water source end and the feed-water end of water heater.
Adopt the circulation of this structure, first in the control gear of centrifugal pump, establish the predefined value into a pump working time; Because user's tap of fetching boiling water makes the water in centrifugal water pump water outlet start to flow, cause current induction switch to be touched, current induction switch passes the signal along to while shake-up to be controlled motor in the control circuit board of control gear and comes into operation; User only need to close water tap for a moment after open water tap, and water pump is worked in Preset Time, and the cold water in water pipe is recycled in heater and is gone; When in life, people use water heater, the cold water that conventionally need to bleed off in water pipe just can go out hot water, form very large water waste, adopt predefined value to stop pump working, in the time that people need to use hot water, only need open water tap moment to close, water pump is started working, cold water in water pipe is recycled in water heater by (the above-mentioned circulatory system), (set time is according to concrete water pipe line length setup times to arrive predefined value, adjustable duration water pump quits work), people again open water water,tap pump work are exactly out hot water.
Brief description of the drawings
Fig. 1 is the explosive view of the pump housing of the present invention and control gear;
Fig. 2 is pump head of the present invention and pump head sealing sectional drawing;
Fig. 3 is pump head of the present invention and pump head sealing plan view;
Fig. 4 is the cooperation schematic diagram of housing of the present invention, impeller and rotor;
Fig. 5 is the explosive view of plug of the present invention;
Fig. 6 is that plug of the present invention coordinates schematic diagram with control gear;
Fig. 7 is the sectional drawing of the embodiment of the present invention 1;
Fig. 8 is the sectional drawing of the embodiment of the present invention 2;
Sectional drawing when Fig. 9 is the embodiment of the present invention 1 water switch startup, the magnetic field of wherein having expressed magnet;
Sectional drawing when Figure 10 is the embodiment of the present invention 2 water switches startup, the magnetic field of wherein having expressed magnet;
Figure 11 is the structural drawing of the first water circulation system of the present invention;
Figure 12 is the structural drawing of the second water circulation system of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described:
As Figure 1-5, a kind of centrifugal water pump, this centrifugal water pump comprises the pump housing, control gear 1; Control gear 1 inside is provided with control circuit board, this control circuit board is for controlling the startup of motor 2 and closing, integrated delay switch circuit on control circuit board, delay switch circuit is for carrying out disable motor 2 according to setting value, this delay switch circuit belongs to the technological means of electronics aspect routine, and the circuit of control panel control electric motor starting also belongs to prior art and therefore do not illustrate; Control gear 1 is provided with socket 11, and socket 11 is for coordinating with plug 12 for powering to centrifugal water pump; The pump housing comprise pump head 21 and with the fixing machine barrel 22 of pump head 21, machine barrel 22 adopts BMC material once injection moulding, pump head 21 adopts plastics disposal molding; This is fixed and can adopt bolt to fix, and control gear 1 is fixed with a side of machine barrel 22; Pump body is also provided with motor, impeller 24, housing 25, pump head capping 26; Impeller 24 fixedly makes impeller 24 can follow rotor 23 with the rotor 23 of motor to rotate, and the rotor 23 of motor is arranged in housing 25, and housing 25 is provided with capping 251, and the axle of rotor 23 passes capping 251 and coordinates with impeller 24; Housing 25 inside are provided with runner, and capping 251 is provided with the discharge orifice of runner, and runner is provided with filter screen 252; Pump head 21 is provided with water intake, water-inlet cavity 29, water outlet and water chamber 28, and water intake communicates with water-inlet cavity 29, and water outlet communicates with water chamber 28, and water chamber 28 communicates with water-inlet cavity 29, and the part cavity of water-inlet cavity 29 is positioned at the below of water chamber 28; Water-inlet cavity 29 and water chamber 28 jointing places are provided with mounting groove, and one end of pump head capping 26 is located in mounting groove, and pump head capping 26 adopts ultrasonic welding with mounting groove; The other end of pump head capping 26 coordinates with the lower end of impeller 24, and impeller 24 is to rotate between rotor 23 and pump head capping 26 to be fixed; Pump head 21 is provided with columnar member 27, this columnar member 27 is positioned near the top and close water outlet of water chamber 28, current induction switch upper cover 30 is detachable fixing with columnar member 27, the inside of current induction switch upper cover 30, columnar member 27, water chamber 28 threes communicate, and current induction switch upper cover 30 upper ends are stretched in the hole that control gear 1 offers.
As shown in Fig. 5-6, Chinese character pin-shaped socket 11 is arranged on control gear; Plug 12 comprises thread head 136, wire clamp 138, rubber ring 137, plug screw, plug overcoat 131, terminal retaining screw, terminal plastic 133, terminal 134, contact disk 135, plug inner sleeve 132; Plug inner sleeve 132 is fixed by plug screw with plug overcoat 131, plug inner sleeve 132 is provided with sealing gasket 40, plug overcoat 131 seals with plug inner sleeve 132, plug inner sleeve 132 and the inner cavity that forms of plug overcoat 131, terminal plastic 133 is positioned at cavity inside to be fixed by terminal retaining screw and plug inner sleeve 131 inwalls; On terminal plastic 133, offer through hole, terminal 134 is located in this through hole, one end of contact disk 135 is that joint terminal 134 connects, the other end is that clamping part is arranged in the jack of plug inner sleeve 132 and is affixed with Socket walls, thereby stretches between two contact disks 35 and contact and power when plug 12 inserts in socket 1 inserted sheet; The upper end of plug overcoat 131 offers tapped hole, facilitates electric wire to stretch into terminal 134 and is connected; On the outer wall of thread head 136, offering screw thread is connected with tapped hole, the central position of thread head 136 offers through hole, on through-hole wall, offer groove, wire clamp 138 is arranged in groove, rubber ring 137 is positioned at the below of wire clamp 138, wire clamp 138 comprises wire clamp circle portion 381, movable I portion 382, movable II portion 383, one end of movable I portion 382, movable II portion 383 is fixed with wire clamp circle portion 381, and the circle that movable I portion 382, movable II portion 383 are the online clamping ring portion 381 that is intervally arranged makes movable I portion 382, movable II portion 383 can play to electric wire the effect of clamping; The outer wall of plug inner sleeve 132 is provided with waterproof ring 140, and when plug 12 inserts in socket 11, thereby waterproof ring 14 is close to anti-sealing with socket 11 inwalls and is entered; On the outer wall of plug overcoat 131, have up and down barb I139, the outer wall corresponding position of socket 11 is provided with barb II121, and when state of rest, barb I139 catches on mutually with barb II121.
As Fig. 7 and Fig. 9 have provided first embodiment of current induction switch of the present invention, water switch impeller 31 is rotated and is fixed on water chamber 28 inside by rotating shaft 32, and water switch impeller 31 tops are provided with permanent magnetic iron 33, permanent magnetic iron 33 is arranged in current induction switch upper cover 30 and stretches into control gear 1, and control gear 1 corresponding position is provided with Hall element 34; In the time that water switch impeller 31 rotates, permanent magnetic iron 33 rotates, thereby magnetic field changes, thereby Hall element 34 senses changes of magnetic field, signal feed back is started to centrifugal water pump in control circuit board.
Fig. 8 and Figure 10 have provided second embodiment of current induction switch of the present invention, water chamber 28 inwalls are provided with fixed support 39, fixed support 39 inside offer sliding chamber 41, the sliding interior slip in chamber 41 is provided with permanent magnetic iron 33, between permanent magnetic iron 33 and a sidewall in sliding chamber 41, is provided with return spring 42; Sliding chamber 41 communicates with the water chamber 28 of pump head, makes current to drive permanent magnetic iron 33 to carry out compression retracteding position spring 42 through sliding chamber 41; Current induction switch upper cover 30 inside are provided with Hall element 34, in the time there is compression in return spring 42, permanent magnetic iron 33 positions change, thereby magnetic field changes, thereby Hall element 34 senses changes of magnetic field, signal feed back are started to centrifugal water pump in control circuit board.
As shown in figure 11, a kind of circulation, comprises centrifugal water pump, and this circulation also comprises water source end, user waterexit end, one-way valve, water heater; Described water source end is connected with the feed-water end of water heater and the cooling water outlet pipeline of user waterexit end respectively, and the waterexit end of water heater is connected with the water intake pipeline of centrifugal water pump, and the water outlet of centrifugal water pump is connected with the hot water outlet pipeline of user waterexit end; User's output terminal is connected with the feed-water end pipeline of water heater; On pipeline between the hot water outlet of centrifugal water pump and user waterexit end, be also provided with a lateral, this lateral is connected on the pipeline between water source end and the cooling water outlet of user waterexit end by one-way valve.
As shown in figure 12, a kind of circulation, comprises centrifugal water pump, and this circulation also comprises water source end, user waterexit end, water heater; Described water source end is connected with the feed-water end of water heater and the cooling water outlet pipeline of user waterexit end respectively, and the waterexit end of water heater is connected with the water intake pipeline of centrifugal water pump, and the water outlet of centrifugal water pump is connected with the hot water outlet pipeline of user waterexit end; User's output terminal is connected with the feed-water end pipeline of water heater; On pipeline between the hot water outlet of centrifugal water pump and user waterexit end, be also provided with a lateral, this lateral is connected on the pipeline between water source end and the feed-water end of water heater.
Claims (10)
1. a centrifugal water pump, this centrifugal water pump comprises the pump housing and control gear, control gear is arranged on a side of the pump housing and one end is provided with power supply unit and control gear inside is provided with control circuit board, control circuit board contains delay switch circuit, and delay switch circuit is for carrying out disable motor according to setting value; The machine barrel that the pump housing comprises pump head and matches with pump head, pump body is provided with motor, by motor-driven impeller; Described motor is started by control gear control; Described pump head is provided with water outlet; It is characterized in that: in described water outlet, be provided with current induction switch, described current induction switch feeds back to water-flow signal in control circuit board.
2. a kind of centrifugal water pump according to claim 1, it is characterized in that: described water outlet is provided with the current induction switch upper cover coordinating with pump head, current induction switch upper cover lower end and pump head secure fit, current induction switch upper cover upper end is stretched in control gear.
3. a kind of centrifugal water pump according to claim 2, is characterized in that: described current induction switch comprises water switch impeller, is fixed on the magnetic devices of water switch impeller top; Described water switch wheel rotation is arranged on the inwall of water outlet, and magnetic devices is arranged in current induction switch upper cover; In control gear, be provided with Hall element, when water switch wheel rotation, Hall element passes the signal along in control circuit board according to changes of magnetic field.
4. a kind of centrifugal water pump according to claim 2, is characterized in that: described machine barrel adopts BMC material once injection moulding, and pump head adopts plastic materials disposal molding.
5. a kind of centrifugal water pump according to claim 2, is characterized in that: described current induction switch is arranged on the fixed support in pump head water outlet; In described fixed support, slide and be provided with magnetic devices; One end of described magnetic devices and support bracket fastened one end offset by spring; In described current induction switch upper cover, be provided with Hall element; Current by time magnetic devices because the effect of current is compressed near Hall element, Hall element passes the signal along in control circuit board according to changes of magnetic field.
6. according to a kind of centrifugal water pump described in claim 3 or 4 or 5, it is characterized in that: described magnetic devices is permanent magnetic iron, and described control gear comprises frequency-variable controller described frequency-variable controller control motor.
7. a kind of centrifugal water pump according to claim 1, is characterized in that: the rotor of described motor is arranged in housing, and housing is provided with capping, and the axle of rotor coordinates with impeller through capping; Housing inside is provided with runner, and capping is provided with the discharge orifice of runner, and runner is provided with filter screen; Described pump head inside is provided be interconnected water-inlet cavity and water chamber, between water-inlet cavity and water chamber, is provided with mounting groove; Secure fit pump head capping in mounting groove; One end of described impeller is connected with the rotor of motor, and the other end stretches in pump head and is rotating with pump head capping, and pump head capping and pump head adopt ultrasonic welding.
8. a kind of centrifugal water pump according to claim 1, is characterized in that: described power supply unit comprises plug and Chinese character pin-shaped socket, and socket is positioned on control gear, and the bottom surface of socket is provided with inserted sheet; Described plug comprises the plug overcoat and the plug inner sleeve that are each other dismantled and assembled cooperation; The inner cavity that forms of plug inner sleeve and plug overcoat, cavity inside is provided with terminal plastic, terminal, contact disk; It is dismantled and assembled fixing that the inwall of terminal plastic and plug inner sleeve is; Terminal is located at terminal plastic inside; One end of terminal is connected with power line; The joint that contact disk comprises and clamping part; Joint is connected with terminal, and retaining part is in jack; Plug overcoat one end face offers tapped hole, and tapped hole is common to mutually power line with cavity and stretches into; This structure also comprises the thread head coordinating with tapped hole; The outer wall of plug inner sleeve is provided with waterproof ring; Described plug also comprises power line and plug sealing configuration, and sealing structure comprises wire clamp, rubber ring; Thread head is provided with endoporus, and wire clamp is located in the endoporus of thread head, and wire clamp comprises movable I portion, movable II portion, and movable I portion, movable II portion is circle distribution and interval arranges; Rubber ring below wire clamp between thread head and plug outer casing inner wall; In described plug, put and be provided with sealing gasket, in the time that plug inner sleeve is inserted plug overcoat, the cavity wall of the sealing gasket above plug inner sleeve and plug overcoat is close to formation sealing.
9. a circulation, is characterized in that: comprise the centrifugal water pump as described in claim 1-8, this circulation also comprises water source end, user waterexit end, one-way valve, water heater; Described water source end is connected with the feed-water end of water heater and the cooling water outlet pipeline of user waterexit end respectively, and the waterexit end of water heater is connected with the water intake pipeline of centrifugal water pump, and the water outlet of centrifugal water pump is connected with the hot water outlet pipeline of user waterexit end; User's output terminal is connected with the feed-water end pipeline of water heater; On pipeline between the hot water outlet of centrifugal water pump and user waterexit end, be also provided with a lateral, this lateral is connected on the pipeline between water source end and the cooling water outlet of user waterexit end by one-way valve.
10. a circulation, is characterized in that: comprise the centrifugal water pump as described in claim 1-8, this circulation also comprises water source end, user waterexit end, water heater; Described water source end is connected with the feed-water end of water heater and the cooling water outlet pipeline of user waterexit end respectively, and the waterexit end of water heater is connected with the water intake pipeline of centrifugal water pump, and the water outlet of centrifugal water pump is connected with the hot water outlet pipeline of user waterexit end; User's output terminal is connected with the feed-water end pipeline of water heater; On pipeline between the hot water outlet of centrifugal water pump and user waterexit end, be also provided with a lateral, this lateral is connected on the pipeline between water source end and the feed-water end of water heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410270812.8A CN104061171B (en) | 2014-06-05 | 2014-06-05 | Water circulation system and centrifugal water pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410270812.8A CN104061171B (en) | 2014-06-05 | 2014-06-05 | Water circulation system and centrifugal water pump |
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| CN104061171A true CN104061171A (en) | 2014-09-24 |
| CN104061171B CN104061171B (en) | 2016-10-26 |
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| CN104612949A (en) * | 2014-11-25 | 2015-05-13 | 界首市友谊水泵厂 | Energy-saving type water pump controlled in variable-frequency mode |
| WO2022042694A1 (en) * | 2020-08-27 | 2022-03-03 | 芜湖美的厨卫电器制造有限公司 | Water pump and water heater having same |
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| CN104061171B (en) | 2016-10-26 |
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