Water pump harmonic current suppression device and water pump

Abstract

The utility model relates to a water pump harmonic current suppression device and a water pump, and the water pump harmonic current suppression device comprises a zero line branch which is used for being connected in series in an alternating current zero line and comprises a first harmonic suppression element (101); and the live wire branch is used for being connected in series in an alternating current live wire and comprises a second harmonic suppression element (201). And harmonic current in the alternating current circuit is suppressed.

Description

TECHNICAL FIELD

[0001] The utility model relates to water pump technical field especially relates to a water pump harmonic current suppression device and water pump. BACKGROUND

[0002] Harmonic current is the superposition of the sine current of the integer multiple fundamental frequency when alternating current is decomposed by Fourier transform. The reason of water pump harmonic current is that when the sine alternating current becomes direct current through the switch power supply rectifier module in the motor controller, the rectifier diode as a nonlinear device will make the sine alternating current distortion and produce high harmonic. With the increase of power, the harmonic current produced by the water pump will also increase and exceed the standard limit.

[0003] Therefore, a water pump harmonic current suppression device is needed to solve the above technical problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a water pump harmonic current suppression device and water pump to suppress the harmonic of the water pump of the alternating current power supply.

[0005] To achieve the above purpose, the utility model provides a water pump harmonic current suppression device, which comprises:

[0006] The zero line branch is used for being connected in series in the zero line of alternating current and comprises a first harmonic suppression element 101.

[0007] The live wire branch is used for being connected in series in the live wire of alternating current and comprises a second harmonic suppression element 201.

[0008] Optionally, the zero line branch further comprises a first zero line connecting terminal 102 and a second zero line connecting terminal 103, and the first harmonic suppression element 101 is connected in series between the first zero line connecting terminal 102 and the second zero line connecting terminal 103.

[0009] Optionally, the live wire branch further comprises a first live wire connecting terminal 202 and a second live wire connecting terminal 203, and the second harmonic suppression element 201 is connected in series between the first live wire connecting terminal 202 and the second live wire connecting terminal 203.

[0010] Optionally, the first harmonic suppression element 101 is an inductor.

[0011] Optionally, the second harmonic suppression element 201 is an inductor.

[0012] Optionally, a printed circuit board (PCB) is used, and the PCB is provided with at least one through hole 3 for fixing a screw to pass through the through hole.

[0013] Optionally, the PCB is further provided with at least one positioning notch 4.

[0014] Optionally, the water pump harmonic current suppression device further comprises:

[0015] The ground wire branch 5 is used for being connected in series in the AC ground wire.

[0016] Optionally, the ground wire branch 5 comprises a first ground wire terminal 501 and a second ground wire terminal 502.

[0017] In another aspect, a water pump is provided, which is powered by AC power and comprises the water pump harmonic current suppression device provided by any of the embodiments.

[0018] As can be seen from the above, the technical scheme provided by the utility model, by connecting the zero line branch and the live wire branch with harmonic suppression elements in series in the zero line and the live wire of the AC power, the harmonic current in the AC power line is suppressed, the propagation of the harmonic current on the power line is suppressed, and the harmonic current is controlled in the water pump. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the water pump harmonic current suppression device provided by the utility model embodiment. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be further described below by combining the drawings and specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all.

[0021] In the utility model, some orientation words are limited, and without making the opposite statement, the orientation words used such as "up", "down", "left", "right", "in", "out" are used for easy understanding, and thus do not constitute the limitation of the protection scope of the utility model.

[0022] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0023] In the description of the utility model, unless another explicit provision and limitation, the term "connect", "connection", "fixed" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integral; can be mechanical connection, also can be electrical connection; can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's mutual action relation. For ordinary skilled in the art, the above-mentioned term can be understood in the utility model with the specific meaning of the specific situation.

[0024] The utility model provides a kind of water pump harmonic current suppression device, as shown in figure Figure 1 It includes:

[0025] Zero line branch, for being connected in series in AC zero line, including first harmonic suppression element 101;

[0026] Firewire branch, for being connected in series in AC firewire, including second harmonic suppression element 201.

[0027] Optionally, the zero line branch further includes first zero line terminal 102 and second zero line terminal 103, and the first harmonic suppression element 101 is connected in series between the first zero line terminal 102 and the second zero line terminal 103.

[0028] Optionally, the firewire branch further includes first firewire terminal 202 and second firewire terminal 203, and the second harmonic suppression element 201 is connected in series between the first firewire terminal 202 and the second firewire terminal 203.

[0029] Optionally, the first harmonic suppression element 101 is an inductor.

[0030] Optionally, the second harmonic suppression element 201 is an inductor.

[0031] Among them, by changing the inductance of inductor, different frequency band high-order harmonic current can be effectively suppressed. As shown in table 1-3, the water pump harmonic current after adding water pump harmonic current suppression device, wherein, table 1 shows the average value of 9th harmonic of water pump harmonic under different power and inductance, table 2 shows the average value of 11th harmonic of water pump harmonic under different power and inductance, and table 3 shows the maximum value of 11th harmonic of voltage harmonic under different inductance of 195W power water pump.

[0032] Table 1

[0033]

[0034] Table 2

[0035]

[0036] Table 3

[0037]

[0038] Optionally, the PCB is used for manufacturing, and the PCB is provided with at least one through hole 3 for fixing a screw to pass through the through hole. Figure 1 In the embodiment, the PCB is fixed in the water pump power box by fixing a screw to pass through the through hole. In the current water pump structure, the volume of the motor controller is required to be high, and the motor controller cannot be internally provided with a measure for suppressing the water pump harmonic current. The water pump harmonic current suppression device is provided outside the motor controller in the form of the PCB, so that the high-order harmonic current can be suppressed.

[0039] Optionally, the PCB is further provided with at least one positioning notch 4. Figure 1 In the embodiment, two positioning notches 4 are provided at the diagonal positions of the PCB.

[0040] Optionally, the water pump harmonic current suppression device further comprises:

[0041] A ground wire branch 5 is used for being connected in series in an AC ground wire.

[0042] Optionally, the ground wire branch 5 comprises a first ground wire terminal 501 and a second ground wire terminal 502.

[0043] In another aspect, the utility model provides a water pump which uses AC power as a power source and comprises the water pump harmonic current suppression device provided by any of the above embodiments and connected in series in a power line.

[0044] Although the utility model has been described in detail above by general description, specific implementation and test, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model all belong to the scope of protection required by the utility model.

Claims

1. A water pump harmonic current suppression device, characterized by, Comprising: a neutral line branch for being connected in series in an AC neutral line, comprising a first harmonic suppression element (101); a live line branch for being connected in series in an AC live line, comprising a second harmonic suppression element (201).

2. The water pump harmonic current suppression device of claim 1, wherein, The neutral line branch further comprises a first neutral line terminal (102) and a second neutral line terminal (103), the first harmonic suppression element (101) being connected in series between the first neutral line terminal (102) and the second neutral line terminal (103).

3. The water pump harmonic current suppression device of claim 2, wherein, The live line branch further comprises a first live line terminal (202) and a second live line terminal (203), the second harmonic suppression element (201) being connected in series between the first live line terminal (202) and the second live line terminal (203).

4. The water pump harmonic current suppression device of claim 1, wherein, The first harmonic suppression element (101) is an inductor.

5. The water pump harmonic current suppression device of claim 4, wherein, The second harmonic suppression element (201) is an inductor.

6. The water pump harmonic current suppression device of claim 1, wherein, The device is made using a printed circuit board (PCB), the PCB having at least one through hole (3) for a fixing screw to pass through.

7. The water pump harmonic current suppression device of claim 6, wherein, The PCB further has at least one positioning notch (4).

8. The water pump harmonic current suppression apparatus according to any one of claims 1 to 7, characterized by, Further comprising: a ground line branch (5) for being connected in series in an AC ground line.

9. The water pump harmonic current suppression device of claim 8, wherein, The ground line branch (5) comprises a first ground line terminal (501) and a second ground line terminal (502).

10. A water pump using alternating current as a power source, characterized by comprising: A water pump harmonic current suppression device according to any one of claims 1-9, connected in series in a power line.

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