Water pump

Abstract

The utility model relates to a water pump which comprises a machine shell, a controller, a rear bearing seat and an anti-magnetic-leakage assembly, the machine shell is provided with a shell cavity, the rear bearing seat is arranged in the shell cavity so as to divide the shell cavity into a control chamber and a water wheel cavity, the controller and the anti-magnetic-leakage assembly are both arranged in the control chamber, and a water wheel is arranged in the water wheel cavity. High-frequency electromagnetic interference signals generated when the controller works can be transmitted to the rear bearing seat, the magnetic leakage prevention assembly comprises a circuit board, a capacitor and a connecting piece, the circuit board is connected with the rear bearing seat, the capacitor is arranged on the circuit board, one end of the connecting piece is connected to the machine shell, and the other end of the connecting piece is connected to the circuit board. By utilizing the characteristic that the capacitor passes through high frequency and resists low frequency, a high-frequency electromagnetic interference signal is transmitted to the casing through the rear bearing seat, the circuit board and the connecting piece in sequence, so that a backflow path of the high-frequency electromagnetic interference signal is changed, the high-frequency electromagnetic interference signal is prevented from being leaked into a test loop, and a disturbance source and disturbance current are prevented from being generated; it is ensured that the conducted emission test of the water pump meets the standard in the high-frequency band, and driving safety is ensured.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, and in particular to a water pump. Background Technology

[0002] Conducted emission testing is a very important part of EMC (Electromagnetic Compatibility) testing. It mainly examines the amount of electromagnetic noise energy transmitted by the product under test through conductors (such as signal lines, power lines, or other metal bodies), and expresses it as a limit of interference voltage or interference current.

[0003] When a water pump is used in a car and subjected to conducted emission testing as a product under test, the interference source generated by the controller inside the water pump will pass sequentially through the rear bearing housing, the water circulating inside the water pump, and the rotor, and then couple into the test loop through the grounding wire. The grounding wire has impedance, which will generate a disturbance voltage drop, which is equivalent to a disturbance source. The disturbance source causes a disturbance current to be generated on the conductor-power line, causing the conducted emission test of the water pump to exceed the standard in the high-frequency band and fail to meet the automotive electronic EMC emission standard (GB18655). That is, the electromagnetic noise energy propagated by the water pump through the conductor-power line is too large, which may cause abnormal operation of other components in the vehicle and thus affect driving safety.

[0004] Therefore, there is an urgent need for a water pump to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a water pump that can at least solve one of the above-mentioned problems.

[0006] To achieve the above objectives, this utility model provides a water pump, comprising:

[0007] The housing, which has a cavity;

[0008] A rear bearing housing is disposed within the housing cavity to divide the housing cavity into a control chamber and a turbine chamber;

[0009] The controller, which is located in the control room, is capable of generating high-frequency electromagnetic interference signals when it is working, and transmitting the high-frequency electromagnetic interference signals to the rear bearing housing;

[0010] An anti-magnetic leakage component is installed in the control room. The anti-magnetic leakage component includes a circuit board, a capacitor, and a connector. The circuit board is located on the side of the rear bearing housing facing the controller and is connected to the rear bearing housing. The capacitor is disposed on the circuit board. One end of the connector is connected to the housing, and the other end is connected to the circuit board. The high-frequency electromagnetic interference signal is transmitted to the housing in sequence through the rear bearing housing, the circuit board, and the connector to prevent the high-frequency electromagnetic interference signal from leaking into the test loop.

[0011] Furthermore, both the circuit board and the rear bearing housing have circular surfaces facing the controller, and the circuit board is adaptively connected to the rear bearing housing's surface facing the controller.

[0012] Furthermore, the number of capacitors is at least one, and the capacitors are arranged at circumferential intervals along the circuit board.

[0013] Furthermore, the spacing d between two adjacent capacitors is 5mm-100mm.

[0014] Furthermore, the number of capacitors is 4-30.

[0015] Furthermore, along the radial direction of the circuit board, the distance between the capacitor and the connector is less than the distance between the capacitor and the center of the circuit board.

[0016] Furthermore, the connecting member is an elastic member.

[0017] Furthermore, the connector includes an abutting part and a welding part connected together, the abutting part abutting against the housing, and the welding part welding to the circuit board.

[0018] Furthermore, the connector also includes a connecting portion, the two ends of which are respectively connected to the abutting portion and the welding portion, and the connecting portion is bent away from the rear bearing seat.

[0019] Furthermore, the water pump also includes an insulating component disposed between the housing and the rear bearing seat.

[0020] The beneficial effects of this utility model are as follows:

[0021] The water pump provided by this utility model includes a housing, a controller, a rear bearing housing, and an anti-magnetic leakage component. The housing has a cavity, and the rear bearing housing is disposed within the cavity to divide the cavity into a control chamber and a water turbine chamber. The controller and the anti-magnetic leakage component are both disposed within the control chamber, and the water turbine is disposed within the water turbine chamber. When the controller is working, it can generate a high-frequency electromagnetic interference signal and transmit the high-frequency electromagnetic interference signal to the rear bearing housing. The anti-magnetic leakage component includes a circuit board, a capacitor, and a connector. The circuit board is located on the side of the rear bearing housing facing the controller and is connected to the rear bearing housing. The capacitor is disposed on the circuit board. One end of the connector is connected to the housing, and the other end is connected to the circuit board. Utilizing the characteristic of capacitors to pass high frequencies and block low frequencies, high-frequency electromagnetic interference signals are sequentially transmitted to the housing via the rear bearing housing, circuit board, and connectors. This prevents high-frequency electromagnetic interference signals from entering the turbine chamber and alters the return path of the signals. It also prevents high-frequency electromagnetic interference signals from coupling into the test loop via the rear bearing housing, the circulating water within the turbine chamber, the rotor, and the grounding wire. This prevents leakage of high-frequency electromagnetic interference signals into the test loop, avoiding the generation of interference sources and interference currents. This ensures that the conducted emission test of the water pump meets the automotive electronic EMC emission standard (GB18655) in the high-frequency band, preventing abnormal operation of other components in the vehicle and ensuring driving safety. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the water pump provided in this embodiment of the utility model;

[0023] Figure 2 This is a cross-sectional view of the water pump provided in this embodiment of the utility model;

[0024] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 This is a structural schematic diagram of the water pump section provided in this embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the anti-magnetic leakage component provided in this embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the connector provided in an embodiment of the present utility model;

[0028] Figure 7 This is a graph showing the test results of conducted emission testing on an existing water pump;

[0029] Figure 8 This is a test result diagram of the water pump provided in this embodiment of the utility model undergoing a conducted emission test.

[0030] In the picture:

[0031] 1. Housing; 2. Rear bearing housing; 3. Anti-magnetic leakage assembly; 4. Insulating components; 5. Controller;

[0032] 11. Control room; 12. Water turbine chamber; 31. Circuit board; 32. Capacitor; 33. Connector; 34. Fastener;

[0033] 331. Abutting part; 332. Welding part; 333. Connecting part. Detailed Implementation

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0035] This utility model defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up", "down", "left", "right", "inner", and "outer", are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this utility model.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] like Figures 1-6As shown, this embodiment provides a water pump, which includes a housing 1, a controller 5, a rear bearing seat 2, and an anti-magnetic leakage component 3. The housing 1 has a cavity, and the rear bearing seat 2 is disposed in the cavity to divide the cavity into a control chamber 11 and a water turbine chamber 12. The controller 5 and the anti-magnetic leakage component 3 are both disposed in the control chamber 11, and the water turbine is disposed in the water turbine chamber 12. When the controller 5 is working, it can generate a high-frequency electromagnetic interference signal and transmit the high-frequency electromagnetic interference signal to the rear bearing seat 2. The anti-magnetic leakage component 3 includes a circuit board 31, a capacitor 32, and a connector 33. The circuit board 31 is located on the side of the rear bearing seat 2 facing the controller 5 and is connected to the rear bearing seat 2. The capacitor 32 is disposed on the circuit board 31. One end of the connector 33 is connected to the housing 1, and the other end is connected to the circuit board 31. Utilizing the characteristic of capacitor 32 to pass high frequencies and block low frequencies, high-frequency electromagnetic interference signals are sequentially transmitted to the housing 1 via the rear bearing seat 2, circuit board 31, and connector 33. This prevents high-frequency electromagnetic interference signals from entering the turbine chamber 12, alters the return path of the high-frequency electromagnetic interference signals, and prevents the high-frequency electromagnetic interference signals from being coupled into the test loop via the rear bearing seat 2, the circulating water in the turbine chamber 12, the rotor in the turbine chamber 12, and the grounding wire. In other words, it prevents high-frequency electromagnetic interference signals from leaking into the test loop, avoiding the generation of interference sources and interference currents. This ensures that the conducted emission test of the water pump meets the automotive electronic EMC emission standard (GB18655) in the high-frequency band, preventing abnormal operation of other components in the vehicle and ensuring driving safety.

[0039] like Figure 2 and Figure 3 As shown, the water pump also includes an insulating component 4, which is disposed between the housing 1 and the rear bearing seat 2 to prevent electrical conduction between the housing 1 and the rear bearing seat 2, thus ensuring the safe use of the water pump.

[0040] like Figures 2-5 As shown, both the circuit board 31 and the rear bearing seat 2 have circular walls facing the controller 5, and the circuit board 31 is adapted to the wall of the rear bearing seat 2 facing the controller 5.

[0041] In this embodiment, the adaptive connection between the circuit board 31 and the wall surface of the rear bearing housing 2 facing the controller 5 means that the circuit board 31 will make adjustments based on the contour of the wall surface of the rear bearing housing 2 facing the controller 5 and the connection between the rear bearing housing 2 and other components. Figure 5 As shown, screws are provided on the wall surface of the rear bearing housing 2 facing the controller 5 for connecting with other components. A notch is opened at the corresponding position of the circuit board 31 to avoid interference between the components.

[0042] Furthermore, the number of capacitors 32 is at least one, and the capacitors 32 are arranged at circumferential intervals along the circuit board 31. The arrangement of multiple capacitors 32 on the circuit board 31 increases the return path for high-frequency electromagnetic interference signals, resulting in better shielding of high-frequency electromagnetic interference signals outside the test loop.

[0043] Furthermore, the spacing d between two adjacent capacitors 32 is 5mm-100mm, which can also be called the joint gap spacing. When the joint gap spacing is within the above range, the high-frequency electromagnetic interference signal can be better shielded outside the test loop.

[0044] Furthermore, the number of capacitors 32 is 4-30.

[0045] Of course, the number of capacitors 32 is not limited to the above number. It can be adjusted according to the size of the circuit board 31 and the spacing d between two adjacent capacitors 32. This embodiment does not limit this, as long as the high-frequency electromagnetic interference signal can be shielded in the outer casing of the test loop.

[0046] Furthermore, along the radial direction of the circuit board 31, the distance between the capacitor 32 and the connector 33 is less than the distance between the capacitor 32 and the center of the circuit board 31. In other words, along the radial direction of the circuit board 31, the capacitor 32 is closer to the edge of the circuit board 31 than to the center of the circuit board 31, which can make the high-frequency electromagnetic interference signal shielding outside the test loop more effective.

[0047] like Figure 4 and Figure 5 As shown, the anti-leakage component 3 also includes a fastener 34, and the circuit board 31 is connected to the rear bearing housing 2 via the fastener 34.

[0048] Specifically, when the circuit board 31 is connected to the rear bearing seat 2 by the fastener 34, the tin plating on the bottom layer of the circuit board 31 abuts against the rear bearing seat 2, thereby realizing the conduction between the circuit board 31 and the rear bearing seat 2.

[0049] Furthermore, no capacitor 32 is placed around the location of the fastener 34 on the circuit board 31 to prevent interference between the capacitor 32 and the fastener 34, thereby ensuring that the capacitor 32 can work normally.

[0050] In other embodiments, the circuit board 31 may also be mounted on the inner wall of the control chamber 11 of the housing 1, as long as the tin plating of the circuit board 31 can abut against the rear bearing seat 2.

[0051] In addition, regardless of whether the housing 1 is a single piece or a separate piece, as long as the circuit board 31 is installed in a suitable position in the cavity of the housing 1 (if the housing 1 is a separate piece, the cavity is formed by assembling the individual pieces), it is sufficient to ensure that the circuit board 31 is connected to the rear bearing seat 2.

[0052] like Figure 6 As shown, connector 33 is an elastic element. When connector 33 is an elastic element, the connection between circuit board 31 and housing 1 can be made more stable.

[0053] like Figure 6 As shown, the connector 33 includes a contact portion 331 and a welding portion 332 connected to each other. The contact portion 331 abuts against the housing 1, and the welding portion 332 is welded to the circuit board 31. The connector 33 is elastic, which makes the contact portion 331 more stable in contact with the housing 1, and also makes the connector 33 adaptable to housings 1 of different sizes, increasing its applicability.

[0054] Furthermore, the connector 33 also includes a connecting portion 333, the two ends of which are connected to the abutment portion 331 and the welding portion 332, respectively. The connecting portion 333 is bent away from the rear bearing seat 2. The bent shape of the connecting portion 333 can increase the strength of the connecting portion 333, prevent the connector 33 from being excessively deformed, extend the service life of the connector 33, and also ensure the stability of the abutment portion 331 abutting against the housing 1.

[0055] Furthermore, there are multiple connectors 33, which are spaced apart circumferentially along the circuit board 31 to increase the stability of the connection between the connectors 33 and the housing 1.

[0056] In this embodiment, the number of connectors 33 can be set and adjusted according to the specific dimensions of the circuit board 31, and there is no specific limitation on this.

[0057] To verify the effectiveness of the water pump provided in this embodiment in conducted emission testing, conducted emission tests were conducted on the water pump provided in this embodiment and the water pump in the prior art. Compared with the water pump provided in this embodiment, the water pump in the prior art lacks the anti-magnetic leakage component 3. The test results are as follows: Figure 7 and Figure 8 As shown.

[0058] Figure 7 The image shows the test results of conducted emission testing on an existing water pump. Figure 8 The image shows the test results of conducted emission testing on the water pump provided in this embodiment. Figure 7 and Figure 8 In the graph, the horizontal axis represents the frequency of alternating current, and the vertical axis represents the electromagnetic noise level, characterized by the limit of interference current. The red solid line represents the limit curve for level 3-PK (peak) current method in the automotive electronic EMC emission standard (GB18655), the pink dashed line represents the limit curve for level 3-AV (average) current method in the automotive electronic EMC emission standard (GB18655), the blue solid line represents the PK-peak curve obtained from conducted emission testing, and the green solid line represents the AV-average curve obtained from conducted emission testing. (Comparison) Figure 7 and Figure 8 As can be seen, in the high-frequency band of alternating current, when existing water pumps are tested for conducted emissions, some of the interference currents in the PK-peak curve have exceeded the limit value of the PK-peak value, and some of the interference currents in the AV-average value curve have exceeded the limit value of the AV-average value. However, the PK-peak value and AV-average value of the water pump provided in this embodiment are both below their corresponding limit values. That is, the conducted emissions test of the water pump provided in this embodiment also meets the automotive electronic EMC emission standard (GB18655) in the high-frequency band, avoiding abnormal working conditions of other components in the vehicle and ensuring driving safety.

[0059] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A water pump characterized by comprising: The utility model relates to a water pump, including: A casing (1) has a shell cavity; A rear bearing seat (2) is arranged in the shell cavity to divide the shell cavity into a control chamber (11) and a water wheel chamber (12); A controller (5) is arranged in the control chamber (11), and the controller (5) can generate a high-frequency electromagnetic interference signal when working and transmit the high-frequency electromagnetic interference signal to the rear bearing seat (2); A magnetic leakage prevention assembly (3) is arranged in the control chamber (11), and the magnetic leakage prevention assembly (3) includes a circuit board (31), a capacitor (32) and a connecting piece (33), the circuit board (31) is located on the side of the rear bearing seat (2) facing the controller (5) and is connected with the rear bearing seat (2), the capacitor (32) is arranged on the circuit board (31), one end of the connecting piece (33) is connected to the casing (1), and the other end is connected to the circuit board (31), and the high-frequency electromagnetic interference signal is transmitted to the casing (1) through the rear bearing seat (2), the circuit board (31) and the connecting piece (33) in sequence to prevent the high-frequency electromagnetic interference signal from leaking into the test loop.

2. The water pump of claim 1, wherein The wall surface of the circuit board (31) and the rear bearing seat (2) facing the controller (5) is circular, and the wall surface of the circuit board (31) and the rear bearing seat (2) facing the controller (5) is adaptively connected.

3. The water pump of claim 2, wherein The number of capacitors (32) is at least one, and each capacitor (32) is arranged along the circumference of the circuit board (31).

4. The water pump of claim 3, wherein The distance between two adjacent capacitors (32) is 5-100mm.

5. The water pump according to claim 3 or 4, characterized in that The number of capacitors (32) is 4-30.

6. The water pump of claim 2, wherein The distance between the capacitor (32) and the connecting piece (33) is less than the distance between the capacitor (32) and the center of the circuit board (31) along the radial direction of the circuit board (31).

7. The water pump of claim 1, wherein The connecting piece (33) is an elastic piece.

8. The water pump according to claim 1 or 7, characterized by The connecting piece (33) includes an abutting portion (331) and a welding portion (332) connected to each other, the abutting portion (331) abuts against the casing (1), and the welding portion (332) is welded to the circuit board (31).

9. The water pump of claim 6, wherein The connecting piece (33) further includes a connecting portion (333), both ends of the connecting portion (333) are connected with the abutting portion (331) and the welding portion (332) respectively, and the connecting portion (333) is bent away from the rear bearing seat (2).

10. The water pump of claim 1, wherein The water pump further includes an insulating piece (4) arranged between the casing (1) and the rear bearing seat (2).

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