Waterproof rotary switch for water pump frequency converter

Abstract

The utility model belongs to the technical field of water pumps, in particular to a waterproof rotary switch for a water pump frequency converter, which comprises a rotary handle arranged on the outer side of a frequency converter shell, the lower surface of the rotary handle is concaved upwards to form two mounting grooves, and the two mounting grooves are symmetrical about the center of the rotary axis of the rotary handle. The inner side of the frequency converter housing is provided with a Hall sensor for sensing the magnetic field change of the magnet, and the Hall sensor transmits a signal to a control unit of the frequency converter. Holes do not need to be formed in the frequency converter shell, the rotary switch is not prone to damage, reliability is high, and the frequency converter shell is good in waterproof capacity.

Description

Technical field:

[0001] The utility model belongs to the technical field of water pumps, in particular to a waterproof rotary switch used for a water pump frequency converter. Background technology:

[0002] When using a frequency converter to drive a variable frequency water pump, the user can adjust the pump speed while the converter is running. Other parameters, such as water pressure and timing, can also be adjusted. These parameters are usually adjusted using buttons or rotary encoder switches. Many frequency converters use potentiometers to set the pump speed. When using buttons to adjust parameters, large parameter variations can make operation cumbersome, and frequent keystrokes can easily damage the panel membrane covering the button portion. Although adjusting parameters using a rotary encoder switch is more convenient, current rotary encoder switches are all contact switches and require holes to be drilled in the frequency converter housing for installation and use. On the one hand, the rotary encoder switch is easily damaged in harsh environments, and on the other hand, it can seriously affect the waterproof capability of the frequency converter panel. Potentiometers and rotary encoder switches have the same problems. Summary of the invention:

[0003] The utility model aims to provide a waterproof rotary switch for a water pump frequency converter, which does not require a hole to be opened on the frequency converter housing, is not easily damaged, has high reliability, and has good waterproof capability of the frequency converter housing.

[0004] The utility model is achieved in this way:

[0005] A waterproof rotary switch for a water pump inverter comprises a rotary handle arranged on the outside of the inverter housing, wherein the lower surface of the rotary handle is concave to form two mounting grooves, and the two mounting grooves are symmetrical about the center of the rotation axis of the rotary handle; a Hall sensor for sensing changes in the magnetic field of a magnet is provided on the inside of the inverter housing, and the Hall sensor transmits signals to a control unit of the inverter.

[0006] In the above-mentioned waterproof rotary switch for a water pump inverter, the magnet may be fixed in such a manner that the magnet is tightly fitted into the mounting groove.

[0007] In the above-mentioned waterproof rotary switch for a water pump inverter, the magnet may be fixed in such a way that the rotary handle is integrally formed with the magnet by injection molding.

[0008] In the above-mentioned waterproof rotary switch for a water pump inverter, the rotary handle includes a cylindrical handle portion and a mounting portion arranged below the handle portion, the magnet is arranged on the mounting portion, a fixed shell is provided on the outside of the inverter housing, the fixed shell includes a fixed portion, the mounting portion is limited between the fixed portion and the inverter housing, a through hole is provided in the middle of the fixed portion for the handle portion to pass through, the inner hole wall of the through hole extends upward along its axial direction to form a positioning cylinder, and the handle portion is radially limited within the positioning cylinder.

[0009] In the above-mentioned waterproof rotary switch for a water pump inverter, the fixing portion and the inverter housing may be mounted in such a manner that the fixing portion is ultrasonically welded to the inverter housing.

[0010] In the above-mentioned waterproof rotary switch for a water pump inverter, the fixing portion and the inverter housing may be mounted in such a manner that: the fixing portion is fixed to the inverter housing by fastening screws.

[0011] In the above-mentioned waterproof rotary switch for a water pump inverter, the inverter housing is sunken to form a groove, the mounting portion is arranged in the groove, and the upper surface of the mounting portion does not protrude from the upper surface of the inverter housing.

[0012] In the above-mentioned waterproof rotary switch for a water pump inverter, a circuit board is provided under the inverter housing, the Hall sensor is installed on the circuit board and is located between the inverter housing and the circuit board, and a mounting column is provided under the inverter housing, and the rod of the screw passes through the mounting column and is screwed to the circuit board.

[0013] In the above-mentioned waterproof rotary switch for a water pump frequency converter, two Hall sensors are provided, and the two Hall sensors are symmetrical about the rotation axis of the rotary handle.

[0014] In the above waterproof rotary switch for a water pump inverter, the Hall sensor is a linear Hall sensor, the control unit is a single chip microcomputer, and the output of the linear Hall sensor is connected to the ADC (analog-to-digital conversion) interface of the single chip microcomputer.

[0015] In the above-mentioned waterproof rotary switch for a water pump inverter, the single chip microcomputer is mounted on a circuit board.

[0016] The outstanding advantages of the utility model compared with the prior art are:

[0017] 1. The present invention detects the rotation of the rotary handle by sensing the position of a magnet on the rotary handle through a Hall sensor disposed on the inner side of the inverter housing. This non-contact detection method does not require opening a hole in the inverter housing. The rotary switch is not easily damaged, has high reliability, and the inverter housing has good waterproofing. The present invention is embedded in the mounting groove of the rotary handle, has a simple structure, and is easy to process and install. The rotary handle of the present invention is provided with two magnets, so that the Hall sensor can monitor the changes in the magnetic field at all times. The system is relatively simple and low in cost.

[0018] 2. The present invention has two Hall sensors. During the rotation process, the timing of the output signals of the two Hall sensors is different, which can accurately detect the direction and angle of rotation, making the detection data more accurate. Description of the drawings:

[0019] Figure 1 It is a cross-sectional view of the utility model;

[0020] Figure 2 It is an exploded view of the utility model;

[0021] Figure 3 It is a bottom view of the rotary handle and magnet of the utility model;

[0022] Figure 4 It is a three-dimensional diagram of the rotary handle of the utility model;

[0023] Figure 5 It is a circuit diagram of the utility model;

[0024] Figure 6 It is a control flow chart of the utility model.

[0025] Figure numerals: 1. Inverter housing; 2. Rotary handle; 21. Handle portion; 22. Mounting portion; 3. Mounting slot; 4. Magnet; 5. Hall sensor; 6. Fixed shell; 61. Fixed portion; 62. Positioning cylinder; 7. Circuit board; 8. Mounting column; 9. Screw. Specific implementation method:

[0026] The present invention is further described below with reference to specific embodiments. Figure 1 —6:

[0027] A waterproof rotary switch for a water pump inverter comprises a rotary handle 2 arranged on the outside of an inverter housing 1, wherein the lower surface of the rotary handle 2 is concavely formed with two mounting grooves 3, and the two mounting grooves 3 are symmetrical about the center of the rotation axis of the rotary handle 2. A Hall sensor 5 for sensing the magnetic field change of a magnet 4 is provided on the inside of the inverter housing 1, and the Hall sensor 5 transmits a signal to a control unit of the inverter.

[0028] The working principle of this utility model is as follows: Figure 1-6 As shown, when the rotary handle 2 is rotated, the position of the magnet 4 relative to the Hall sensor 5 changes, the magnetic field strength at the location of the Hall sensor 5 changes, and the Hall sensor 5 outputs a signal to the control unit of the inverter. The control unit adjusts the water pump speed according to the signal of the Hall sensor 5.

[0029] Furthermore, the Hall sensor 5 adopts a linear Hall sensor, the control unit is a single chip microcomputer, and the output of the linear Hall sensor is connected to the ADC (analog-to-digital conversion) interface of the single chip microcomputer. The circuit diagram is as follows Figure 5 shown.

[0030] The control principle of the present invention is as follows: a relationship curve between the rotation position of the rotary handle 2 (the position of the magnet 4) and the output of the Hall sensor 5 is obtained in advance through experiments, and a data table is prepared. The single-chip microcomputer obtains the size of the output of the Hall sensor 5 through the ADC (analog-to-digital conversion) interface, and calculates the current position of the rotary handle 2 based on the pre-obtained data table or curve relationship. The position parameter is used by the single-chip microcomputer to set various parameters, adjust the water pump speed, and realize the function of a rotary coding switch or potentiometer.

[0031] In this embodiment, the magnetic pole direction of the magnet 4 is as follows: Figure 3 shown.

[0032] When one magnet is used, the magnetic field strength of the magnet is not strong. When the distance between the magnet and the Hall sensor 5 is far, the Hall sensor 5 cannot sense the magnet, which results in the Hall sensor 5 being unable to detect the magnetic field change. When three or more magnets are used, the system is more complicated and the cost is also high.

[0033] The utility model detects the rotation of the rotary handle 2 by sensing the position of the magnet 4 arranged on the rotary handle 2 through the Hall sensor 5 arranged on the inner side of the inverter housing 1. The detection is non-contact and there is no need to open a hole in the inverter housing 1. The rotary switch is not easy to be damaged and has high reliability. The inverter housing 1 has good waterproof ability. The utility model is embedded in the installation groove of the rotary handle, has a simple structure, and is easy to process and install. Two magnets are arranged on the rotary handle 2 of the utility model, so that the Hall sensor 5 can monitor the magnetic field changes at all times. The system is simple and the cost is low.

[0034] Fixing method of the magnet 4: the magnet 4 can be tightly fitted into the mounting slot 3, and the rotary handle 2 can also be integrally formed with the magnet 4 by injection molding.

[0035] The structure and installation structure of the rotating handle 2: Figure 1-4As shown, the rotary handle 2 includes a cylindrical handle portion 21 and a mounting portion 22 disposed below the handle portion 21. The magnet 4 is disposed on the mounting portion 22. A fixed housing 6 is disposed outside the inverter housing 1. The fixed housing 6 includes a fixing portion 61. The mounting portion 22 is limited between the fixing portion 61 and the inverter housing 1. A through hole is provided in the middle of the fixing portion 61 for the handle portion 21 to pass through. The inner wall of the through hole extends axially upward to form a positioning cylinder 62. The handle portion 21 is radially limited within the positioning cylinder 62. The structure is simple, easy to install, and has a good limiting effect.

[0036] Installation method of the fixing portion 61 and the inverter housing 1: the fixing portion 61 can be fixed to the inverter housing 1 by ultrasonic welding, or the fixing portion 61 can be fixed to the inverter housing 1 by fastening screws.

[0037] Furthermore, the inverter housing 1 is sunken to form a groove, the mounting portion 22 is arranged in the groove, and the upper surface of the mounting portion 22 does not protrude from the upper surface of the inverter housing 1, thereby reducing the occupied space on the upper side of the inverter housing 1.

[0038] The installation structure of the Hall sensor 5 is as follows: Figure 1 、 2 As shown, a circuit board 7 is provided under the inverter housing 1, and the Hall sensor 5 is installed on the circuit board 7 and is located between the inverter housing 1 and the circuit board 7. A mounting column 8 is provided under the inverter housing 1, and the rod of the screw 9 passes through the mounting column 8 and is screwed to the circuit board 7.

[0039] Preferably, two Hall sensors 5 are provided, and the two Hall sensors 5 are symmetrical about the rotation axis of the rotary handle 2. The two Hall sensors 5 are provided at different positions relative to the magnet 4. Therefore, during the rotation process, the timing of the output signals of the two Hall sensors 5 is different. By combining the above two situations, the direction and angle of rotation can be detected, making the detection data more accurate.

[0040] Furthermore, the single chip microcomputer is mounted on a circuit board 7 .

[0041] like Figure 6 As shown, the control method of the utility model includes the following steps:

[0042] Step 1: Initialize the MCU;

[0043] Step 2: ADC obtains the output values ​​H1 and H2 of the two Hall sensors 5;

[0044] Step 3: Look up the table or calculate to get the current position 1;

[0045] Step 4: Handle other tasks;

[0046] Step 5: ADC obtains new output values ​​Hi1 and Hi2 of the Hall sensor 5;

[0047] Step 6: Look up the table or calculate to get the current position i;

[0048] Step 7: The current position or position difference is used to set the inverter parameters;

[0049] Step 8: Process other tasks and return to step 5.

[0050] The above embodiment is only one of the preferred embodiments of the present invention and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made based on the shape, structure, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A waterproof rotary switch for a water pump inverter, characterized by: The invention comprises a rotary handle (2) arranged on the outside of a frequency converter housing (1), wherein the lower surface of the rotary handle (2) is concave to form two mounting grooves (3), and the two mounting grooves (3) are symmetrical about the rotation axis of the rotary handle (2); a Hall sensor (5) for sensing the magnetic field change of a magnet (4) is provided on the inside of the frequency converter housing (1), and the Hall sensor (5) transmits a signal to a control unit of the frequency converter.

2. The waterproof rotary switch for a water pump inverter according to claim 1, characterized in that: The rotary handle (2) comprises a cylindrical handle portion (21) and a mounting portion (22) arranged below the handle portion (21); the magnet (4) is arranged on the mounting portion (22); a fixed shell (6) is provided on the outside of the inverter housing (1); the fixed shell (6) comprises a fixed portion (61); the mounting portion (22) is limited between the fixed portion (61) and the inverter housing (1); a through hole for the handle portion (21) to pass through is provided in the middle of the fixed portion (61); the inner wall of the through hole extends upward along its axial direction to form a positioning cylinder (62); the handle portion (21) is radially limited in the positioning cylinder (62).

3. The waterproof rotary switch for a water pump inverter according to claim 2, characterized in that: The inverter housing (1) is sunken to form a groove, the mounting portion (22) is arranged in the groove, and the upper surface of the mounting portion (22) does not protrude from the upper surface of the inverter housing (1).

4. The waterproof rotary switch for a water pump inverter according to claim 1, characterized in that: A circuit board (7) is provided below the inverter housing (1); the Hall sensor (5) is mounted on the circuit board (7) and is located between the inverter housing (1) and the circuit board (7); a mounting post (8) is provided below the inverter housing (1); and a rod of a screw (9) passes through the mounting post (8) and is screwed to the circuit board (7).

5. The waterproof rotary switch for a water pump inverter according to claim 1, characterized in that: Two Hall sensors (5) are provided, and the two Hall sensors (5) are symmetrical about the rotation axis of the rotary handle (2).

6. The waterproof rotary switch for a water pump inverter according to claim 1, characterized in that: The Hall sensor (5) is a linear Hall sensor, the control unit is a single chip microcomputer, and the output of the linear Hall sensor is connected to the ADC interface of the single chip microcomputer.

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