WO2012174718A1

WO2012174718A1 - Single-phase permanent magnet rotor electric water pump only rotating in right direction and its realization method

Info

Publication number: WO2012174718A1
Application number: PCT/CN2011/076159
Authority: WO
Inventors: 吴望; 曾小泉
Original assignee: 深圳市兴日生实业有限公司
Priority date: 2011-06-22
Filing date: 2011-06-22
Publication date: 2012-12-27
Also published as: EP2725234A4; US20140127040A1; EP2725234A1

Abstract

Disclosed are a single-phase permanent magnet rotor electric pump only rotating in a right direction and its realization method. The method comprises the following steps: controlling the size of a water chamber (3) within a water pump body (2) such that a space volume of the water chamber is 3 times or more than that of a space enclosed by each blade (45) of an inner arc water impeller (42) during rotation, and the diameter of the water chamber is 1.2 times or more than that of the water impeller at its common axis; designing the water pump body such that a portion of an inner wall of a water outlet pipe (7) away from the central axis (OO') of the water chamber is parallelly deflected outward in a distance Δ from a tangent of the water chamber inner wall (31), thereby establishing a step structure (6); selecting a single-phase permanent magnet rotor motor of a proper torque to drive the arc water impeller within the water pump body, and limiting the fluctuation range of power supply voltage, thus ensuring that the electric water pump rotates only in a right rotation direction and against the bending direction of the individual water blade. This method enables the water pump to rotate in the right direction under the single-phase AC power supply condition where the fluctuation is up to 20% of the rated voltage.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary non-variable-capacity pumping device and a drag mechanism thereof, and more particularly to a curved water impeller of the pumping device The method of increasing the difference in resistance torque between turning and reversing, in particular, relates to a method and a device for causing a single-phase permanent magnet rotor motor to drive only the correct direction of rotation. BACKGROUND OF THE INVENTION The prior art drives a centrifugal water pump by means of a single-phase AC permanent magnet rotor synchronous motor, and the permanent magnet rotor and the water impeller coaxial line of the centrifugal water pump are directly coupled, see FIG. 3, the structure is simple, the shape is light, and the production is simple. It is easy, and the cost is relatively low, and it is widely used. However, the starting torque of the single-phase permanent magnet rotor synchronous motor is almost zero, and any water flow disturbance will affect and change the direction of starting and running of the motor rotor, that is, the direction of starting and running of the motor rotor is uncertain and random. of. Because of this, earlier in the prior art, such single-phase permanent magnet rotor electric water pumps were in the form of water impellers and intermediate outlets with very low efficiency straight blades, ie the central axis of the outlet holes fell in the water impeller radial direction. And orthogonal to the central axis of the water impeller, as shown in Figure 6. In order to improve the water discharge efficiency of the water pump, it has been attempted to control the drag motor of the water pump with a semiconductor integrated circuit and/or embedded software to rotate it in a specified direction without interference, for example, European Patent Application EP 0 574 823 A2 and EP. 1 075 080 A2, and the technology disclosed in Chinese Patent Application No. 200710031484. 6, whereby a highly efficient curved water impeller and tangential effluent form having curved water blades in the same direction can be used, as shown in FIG. Make the electric water pump energy efficient. However, the above-mentioned patented technologies all have the problems of a significant increase in cost, a relatively complicated structure, and a decrease in reliability.

In the case of using a highly efficient curved water impeller and a tangential outlet water pump structure that bends each water blade in the same direction, the resistance torque of the curved water impeller in forward and reverse rotation should be first sought. The difference is increased, so that in the starting state, when the rotor assembly of the electric water pump is somewhat shaken, it naturally rotates in a direction in which the resistance torque is small, and the faster the rotation, until the synchronous rotation speed is reached. Another issue to consider is the range of voltage fluctuations of the power supply. Analysis shows that if the supply voltage of the drag motor deviates from the rated value, the drag torque will be more deviated. Therefore, the drag torque of the motor must be lower than the resistance torque when the water impeller is reversed at the highest supply voltage, and the drag torque of the motor at the lowest supply voltage is greater than the resistance torque of the water impeller, which naturally becomes the electric motor. The necessary conditions for reliable operation of the pump. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to avoid the deficiencies of the prior art described above, and to provide a centrifugal water pump that is driven by a single-phase permanent magnet rotor motor with only correct rotation direction without increasing the cost. The method and device can greatly improve the energy efficiency of such a pump, and can be applied to an area where the voltage fluctuation range of the power supply network is larger. The technical problem solved by the present invention can be achieved by using the following technical solutions: Proposed a single-phase permanent magnet rotor electric The method in which the pump only has the correct direction of rotation, including the steps

A. Control the size of the water chamber in the water pump body, make sure that the space volume of the water chamber is more than three times the space of the water blades of the inner curved water impeller, and the diameter of the water chamber is the water inside. More than 1.2 times the diameter of the impeller to increase the resistance torque of the curved water impeller in the wrong direction;

B. When designing the water pump body, the tangential water discharge form is adopted such that the inner wall of the water outlet pipe disposed on the radial side of the water chamber and communicating with the water chamber is away from the central axis of the water chamber, Parallel to the outer side of the tangential line of the inner wall of the water chamber for a distance Δ, resulting in a catastrophic structure, further increasing the resistance torque of the curved water impeller rotating in the wrong direction;

C. Select a suitable single-phase permanent magnet rotor motor to drive the water impeller in the pump body to limit the fluctuation range of the supply voltage. Make sure that the motor's drag torque M _{max is lower} than the water impeller at the highest supply voltage. The wrong direction of rotation, that is, the resistance torque N of the reverse rotation. _Pp , and the drag torque M _min at the lowest supply voltage is greater than the water impeller rotating in the correct direction, that is, the resistive torque N _fM of the forward rotation, the structural shape of the water chamber and the permanent magnet The size of the rotor is guaranteed to be N. _Pp >> N _fM , so there is

Mmax < N ₀ Mmin> Nf _0Γ ^

Thereby ensuring that the electric water pump has only the correct direction of rotation against the bending direction of the water blades; the space volume of the water chamber in the step 是 refers to the entire space after the water chamber is closed by the water chamber cover Volume. As for the mutant structure described in the step B, wherein the geometric relationship is satisfied

0. 50 > A /d > 0. 20 , where d is the inner diameter of the water outlet pipe;

In another preferred embodiment, the geometric relationship of the mutated structure in the step B is satisfied.

0. 30 > A /d > 0. 20 , where d is also the inner diameter of the outlet pipe.

In still another embodiment of the present invention, the method for making the single-phase permanent magnet rotor electric water pump only have the correct direction of rotation further includes the steps

D. adding at least one movable baffle, the movable baffle can rotate on the inner wall of the water chamber about an axial axis; and the back surface of the curved water impeller is provided with a substrate having a diameter slightly larger than the diameter of the arc water impeller. When the water impeller is reversed, the water flow blasts the movable baffle to lift it against the edge of the substrate, hindering the water impeller from reversing.

The invention also provides a high-efficiency electric water pump with only the correct direction of rotation, comprising a pump body and a water chamber having a substantially cylindrical space therein, the water chamber cover of the axially outer end of the water chamber defining a water chamber a space of the chamber, the arcuate water impeller on the rotor assembly is coaxially received in the space of the water chamber, and the permanent magnet rotor of the single-phase synchronous motor coaxially mounted by the water impeller is dragged and rotated; The radial side of the water chamber is provided with a water outlet pipe communicating with the water chamber; in particular, the space volume of the water chamber is more than three times the space occupied by the water blades of the inner curved water impeller; while the diameter D of the water chamber is coaxial impeller than 1.2 times of water of its inner diameter D _Y, where the water volume space of the chamber means, all the space after the cap is closed water chamber of the water chamber Volume The inner wall of the water outlet pipe is away from the central axis 00' of the water chamber, and is laterally offset from the tangential line of the inner wall of the water chamber by a distance Δ, resulting in a mutated structure.

The mutated structure, wherein the geometric relationship is satisfied

0. 50 > A /d > 0. 20 , where d is the inner diameter of the water outlet pipe.

In another preferred embodiment, the geometric relationship of the mutated structure is satisfied

0. 30 > A /d > 0. 20 , where d is the inner diameter of the water outlet pipe.

In another preferred embodiment, the present invention has only a high-efficiency electric water pump of correct rotation direction, and further includes at least one movable file disposed on the inner wall of the water chamber and rotating around an axial axis of the inner wall of the water chamber. plate, and said arcuate back surface of the water wheel is provided with a slightly larger diameter than the substrate of the impeller diameter D _y of water, an impeller flow reversal, the water activity tailgate flung against the water wheel so that the tilt of the substrate The edge prevents the water impeller from reversing.

Compared with the prior art, the utility model has the beneficial effects that the high-efficiency water pump can only have the correct rotation direction under the single-phase AC power supply condition with the fluctuation range of up to 20% of the rated voltage. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front elevational view showing the overall appearance of a preferred embodiment of a single-phase permanent magnet rotor electric water pump according to the present invention, wherein FIG. 1-1 is a front view, and is a cross-sectional view taken along line AA of FIG. 1-2; FIG.

2 is a schematic projection view of the overall appearance of the preferred embodiment, wherein FIG. 2-1 is a schematic exploded view; FIG. 1-1 is a schematic view of the assembled axial projection;

3 is a schematic projection view of the electric centrifugal water pump rotor assembly 4, including FIG. 3-1 as an exploded state schematic view; FIG. 3-2 is a schematic view of the assembled axial projection;

4 is a front elevational view showing the overall appearance of another preferred embodiment of the single-phase permanent magnet rotor electric water pump of the present invention, wherein FIG. 4-1 is a front cross-sectional view of the curved water impeller in the forward rotation, and the movable baffle 33 is bottomed. Figure 4-2 is a front cross-sectional view of the curved water impeller in reverse, the movable baffle 33 stands up, the two figures are AA cross-sectional view of Figure 4-3; Figure 4-3 is a top view;

5 is a front projection view of the overall appearance of a prior art single-phase permanent magnet rotor electric water pump (arc water impeller), wherein FIG. 5-1 is a front view, which is a cross-sectional view taken along line AA of FIG. 5-2; and FIG. 5-2 is a top view. ;

6 is a front elevational view of the overall appearance of a single-phase permanent magnet rotor electric water pump (straight water blade) in the prior art, wherein FIG. 6-1 is a front view, which is a cross-sectional view taken along line AA of FIG. 6-2; 2 is a top view. DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for the single-phase permanent magnet rotor electric water pump to have only the correct direction of rotation, including steps

A. Control the size of the water chamber in the water pump body, make sure that the space volume of the water chamber is more than three times the space of the water blades of the inner curved water impeller, and the diameter of the water chamber is the water inside. More than 1.2 times the diameter of the impeller to increase the resistance of the arcuate water impeller to rotate in the wrong direction; B. When designing the water pump body, the tangential water discharge form is adopted such that the inner wall of the water outlet pipe disposed on the radial side of the water chamber and communicating with the water chamber is away from the central axis of the water chamber, Parallel to the outer side of the tangential line of the inner wall of the water chamber for a distance Δ, resulting in a catastrophic structure to increase the resistance of the curved water impeller to rotate in the wrong direction;

C. Use a single-phase permanent magnet rotor motor with appropriate torque to drag the water impeller in the pump body to limit the fluctuation range of the supply voltage. Make sure that the motor's drag torque M _{max is lower} than the water impeller at the highest supply voltage. The wrong direction of rotation, that is, the resistance torque N of the reverse rotation. _Pp , and the drag torque M _min at the lowest supply voltage is greater than the water impeller rotating in the correct direction, that is, the resistive torque N _{fQI of the} forward rotation, here Ν. _ΡΡ >> Ν _3⁄4Ι , so there is

Mmax < N ₀ Mmin> Nf _0Γ ^

Therefore, it is ensured that the electric water pump has only the correct direction of rotation against the bending direction of the water blades in the entire fluctuation range of the supply voltage.

Step The space volume of the water chamber in the crucible refers to the total volume of the space after the water chamber is closed by the water chamber cover.

As for the mutated structure in the step B, the geometric relationship satisfies 0. 50 > Δ / (! > (). 20, where d is the inner diameter of the water outlet pipe.

0. 30 > A /d > 0. 20 , where d is also the inner diameter of the outlet pipe.

In still another embodiment of the present invention, the method for the single-phase permanent magnet rotor electric water pump to have only the correct direction of rotation further includes the steps

The single-phase permanent magnet rotor electric water pump of the present invention has only the correct rotation direction, as shown in FIGS. 1 to 3, and includes a pump body 2 and a water chamber 3 having a substantially cylindrical space therein, and an axially outer end of the water chamber 3 The assembled water chamber cover 8 defines a space for the water chamber 3, and the curved water impeller 42 on the rotor assembly 4 is housed coaxially within the space of the water chamber 3, and is coaxially mounted by the water impeller 42 The permanent magnet rotor 41 of the phase synchronous motor is dragged and rotated; a water outlet pipe 7 communicating with the water chamber 3 is disposed on a radial side of the water chamber 3; in particular, the inner wall 71 of the water outlet pipe 7 is far away A portion of the central axis 00' of the water chamber 3 is moved parallel to the outside by a distance Δ from the tangent of the inner wall 31 of the water chamber 3, resulting in an abrupt structure 6, thereby further increasing the arcuate water impeller 42. The resistance to rotation (i.e., reversal) in the wrong direction is to ensure that the high efficiency pump has only the correct direction of rotation (i.e., forward rotation) against the direction in which the respective water blades 45 are bent.

The spatial volume of the water chamber 3 is more than three times that of the inner curved water impeller 42 when the water blades 45 rotate, and the water chamber diameter D is 1 of the inner coaxial water impeller diameter D _y 2 times or more, the space volume of the water chamber 3 herein refers to the total volume of the space after the water chamber 3 is closed by the water chamber cover 8; The mutant structure 6, wherein the geometric relationship is satisfied

0.50> A/d>0.20, where d is the inner diameter of the water outlet pipe 7.

0.30> A/d>0.20, where d is the inner diameter of the water outlet pipe.

In another embodiment of the present invention, as shown in FIG. 4, the single-phase permanent magnet rotor electric water pump having only the correct rotation direction further includes at least one axial member disposed on the inner wall 31 of the water chamber and surrounding the inner wall 31 of the water chamber. activity baffle axis of rotation 33, while the back of the water wheel 42 is provided with an arcuate substrate having a diameter slightly larger than the diameter D _y 42 water impeller 43, the impeller 42 flow reversal, the water activity red open tailgate 33 It is lifted up against the edge of the water impeller substrate 43, and the water impeller 42 is prevented from being reversed.

The prior art single-phase permanent magnet rotor electric water pump is shown in Fig. 5 and Fig. 6, wherein Fig. 5 is a curved water impeller and a tangential effluent form, and Fig. 6 is a water impeller and a middle effluent form of a straight blade. In Fig. 5, 2 is the pump body, 3 is the water chamber, 31 is the inner wall of the water chamber, 32 is the tangential outlet pipe, and 45 is the curved water blade. In Fig. 6, 2 is the pump body, 3 is the water chamber, 10 is the straight water impeller, and 11 is the intermediate outlet pipe. Compared with the present invention, the prior art single-phase permanent magnet rotor electric water pump has the problems of high cost, complicated structure and low reliability.

Claims

Claims, a method for making the single-phase permanent magnet rotor electric water pump only have the correct direction of rotation, including steps

A. Control the size of the water chamber in the water pump body, make sure that the space volume of the water chamber is more than three times the space of the rotation of the water blades of the inner curved water impeller, and the diameter of the water chamber is the inner coaxial axis. More than 1.2 times the diameter of the water impeller, to increase the resistance torque of the curved water impeller rotating in the wrong direction;

B. designing the water pump body, using a tangential water outlet form such that a portion of the inner wall of the water outlet pipe disposed at a radial side of the water chamber and communicating with the water chamber away from a central axis of the water chamber Parallel to the outer side of the tangential line of the inner wall of the water chamber for a distance Δ, resulting in a catastrophic structure, further increasing the resistance torque of the curved water impeller rotating in the wrong direction;

C. Select the arc-shaped water impeller in the pump body by using a single-phase permanent magnet rotor motor with appropriate torque to limit the fluctuation range of the supply voltage. Make sure that the drag torque M _max of the motor is lower than the arc at the highest supply voltage. The water impeller rotates in the wrong direction, that is, the reverse resistance torque N. _Pp , and the drag torque M _min at the lowest supply voltage is greater than the arc water impeller rotating in the correct direction, that is, the resistive torque N _fM of the forward rotation, the structural shape of the water chamber and the relative The size of the magnetic rotor guarantees N. _Pp >> N _fM , so there is

Mmax < N ₀ Mmin> Nf _0Γ ^

Thereby ensuring that the electric water pump has only the correct direction of rotation against the bending direction of the water blades; the space volume of the water chamber in the step 是 refers to the entire space after the water chamber is closed by the water chamber cover Volume. The method according to claim 1, wherein the single-phase permanent magnet rotor electric water pump has only the correct direction of rotation, wherein: the mutant structure in the step B, wherein the geometric relationship is satisfied

0. 50 > A /d > 0. 20 , where d is the inner diameter of the water outlet pipe. The method according to claim 2, wherein the single-phase permanent magnet rotor electric water pump has only the correct direction of rotation, wherein: the abrupt structure in the step B, wherein the geometric relationship is satisfied

0. 30 > A /d > 0. 20 , where d is the inner diameter of the water outlet pipe. A method for making a single-phase permanent magnet rotor electric water pump only have a correct direction of rotation according to claim 1, further comprising the steps

D. adding at least one movable baffle, the movable baffle can rotate on the inner wall of the water chamber about an axial axis; and the back surface of the curved water impeller is provided with a substrate having a diameter slightly larger than the diameter of the arc water impeller. When the water impeller is reversed, the water flow blasts the movable baffle to lift it against the edge of the substrate, hindering the water impeller from reversing. A single-phase permanent magnet rotor electric water pump having only the correct direction of rotation, comprising a pump body (2) and a water chamber (3) having a substantially cylindrical space therein, the axial chamber outer end assembly of the water chamber (3) The water chamber cover (8) defines a space for the water chamber (3), and the curved water impeller (42) on the rotor assembly (4) is coaxially received in the space of the water chamber (3), a permanent magnet rotor of the single-phase synchronous motor coaxially mounted by the water impeller (42) is rotated and rotated; a water outlet pipe communicating with the water chamber (3) is disposed at a radial side of the water chamber (3) (7); It is characterized by:

The space volume of the water chamber (3) is more than three times that of the inner water arc blade (42) when the water blades (45) rotate, and the water chamber diameter D is the inner coaxial water. The impeller diameter D _y is more than 1.2 times. The space volume of the water chamber (3) herein refers to the total volume of the space after the water chamber (3) is closed by the water chamber cover (8);

The inner wall (71) of the water outlet pipe (7) is away from the central axis 00' of the water chamber (3), and is laterally offset outwardly from the tangent of the inner wall (31) of the water chamber (3) by a distance Δ , causing a mutant structure (6). A single-phase permanent magnet rotor electric water pump having only the correct direction of rotation according to claim 5, wherein:

The mutant structure), wherein the geometric relationship is satisfied

0.50> A/d>0.20, where d is the inner diameter of the water outlet pipe (7). A single-phase permanent magnet rotor electric water pump having only the correct direction of rotation according to claim 5, wherein:

The geometric relationship of the mutant structure is satisfied

0.30>A/d>0.20, where d is the inner diameter of the water outlet pipe. The single-phase permanent magnet rotor electric water pump having only the correct rotation direction according to claim 5, further comprising: at least one disposed on the inner wall (31) of the water chamber and surrounding the inner wall of the water chamber ( 31) on an axial axis of rotation activity baffle (33), and said curved water wheel (42) is provided with the rear surface ⁽⁴²⁾ of the substrate diameter D _y of a diameter slightly greater than the water wheel ^(43), Flow The impeller ( ⁴² ) is reversed, and the flow of water blasts the movable baffle (33) to lift it against the edge of the water impeller substrate (43), hindering the reversal of the water impeller (42).

2