Simple testing device applied to low-voltage direct-current variable-frequency pump driver

Abstract

The utility model discloses a simple testing device applied to a low-voltage direct-current variable-frequency pump driver, which belongs to the technical field of variable-frequency pumps and comprises a testing power supply used for providing voltage for a to-be-tested driver board and collecting current values, and the testing power supply adopts a high-resolution programmable direct-current power supply; the testing tool comprises a base, a supporting plate and a positioning plate, the supporting plate is arranged between the base and the positioning plate, fastening screws are fixedly connected to the two sides of the top of the supporting plate, the positioning plate is movably connected to the outer sides of the two fastening screws in a sleeving mode, and fastening nuts are connected to the outer sides of the fastening screws in a threaded and sleeving mode. The fastening nut movably abuts against the top of the positioning plate. According to the utility model, the equipment maintenance cost is reduced, a product can be judged to be qualified by only observing a current value, the test efficiency is improved, a simulation load test method is used, actual fluid load equipment is not needed, the space and the cost are saved, the time of the simulation load test method is less, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of variable frequency pumps, in particular to a simple testing device applied to a low-voltage direct current variable frequency pump driver. Background Art

[0002] Compared with traditional pumps, 24V DC low-voltage variable frequency pumps have the advantages of being intelligent, energy-saving and easy to use, and the market volume has been increasing in recent years. The demand for electronic control drives, which are key components of variable frequency pumps, has also increased simultaneously. DC variable frequency drives have a complex hardware circuit structure, and each drive must be powered on for testing to ensure reliable operation. Since variable frequency drives have many test points, the standard test method for electronic control drive boards is to use a test needle bed for static testing followed by dynamic load testing.

[0003] The specific test method has two steps, A and B:

[0004] A. Static test: Use a bed of needles to test whether the voltage value of each key point is qualified. The inconvenience of this test method is: 1. The test speed is slow and time-consuming; 2. Multi-point voltage collection will cause more electric shocks in the bed of needles test. The probes required for the contacts are consumable parts and need to be replaced frequently, resulting in high equipment maintenance costs;

[0005] Dynamic test: After the static test is passed, connect the water pump and motor load to test whether the electronic control starts and runs normally in the water tank system. The test defects here are: 1. The fluid load fluctuates greatly, and accurate data can only be observed after the test data stabilizes, and the test efficiency is low; 2. The water tank and water pump occupy a large space and are not suitable for assembly line operation; therefore, we propose a simple test device for low-voltage DC variable frequency pump drivers to solve this problem. Utility Model Content

[0006] The purpose of the utility model is to provide a simple test device applied to a low-voltage DC variable frequency pump driver to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A simple test device for low voltage DC variable frequency pump driver, comprising:

[0009] A test power supply, used to provide voltage to the driver board to be tested and collect current values, wherein the test power supply adopts a high-resolution programmable DC power supply;

[0010] A test tool, the test tool includes a base, a support plate and a positioning plate, the support plate is arranged between the base and the positioning plate, and both sides of the top of the support plate are fixedly connected with fastening screws, the positioning plate is movably sleeved on the outside of the two fastening screws, and the outer side of the fastening screws is threadedly sleeved with a fastening nut, and the fastening nut is movably abutted against the top of the positioning plate.

[0011] Preferably, a display screen, a control button, a power button and three terminal sockets are provided on the front side of the test power supply, the display screen includes a voltage display area and a current display area, and the minimum resolution of the test power supply is 1 mA.

[0012] Preferably, two guide columns are fixedly connected to the top of the base, the support plate is fixedly sleeved on the outside of the two guide columns, and two guide cylinders are fixedly installed on the top of the positioning plate, and the two guide cylinders are respectively slidably sleeved on the outside of the corresponding guide columns.

[0013] Preferably, a fixing screw is fixedly installed on the rear side of the bottom of the base, the support plate and the positioning plate are movably sleeved on the outside of the fixing screw, and a fixing nut is threadedly sleeved on the outside of the fixing screw, and the number of the fixing nuts is at least two.

[0014] Preferably, two fixing rods are fixedly mounted on the top of the base, the supporting plate is fixedly sleeved on the outer sides of the fixing rods, and the positioning plate is slidably sleeved on the outer sides of the fixing rods.

[0015] Preferably, a backing plate is movably sleeved on the outer side of the fastening screw, and the backing plate is movably abutted between the supporting plate and the positioning plate.

[0016] Preferably, a washer is fixedly sleeved on the outer side of the fixing screw, and the washer movably abuts between the supporting plate and the positioning plate.

[0017] In the utility model, a simple test device for a low-voltage DC variable frequency pump driver is described, which fixes the drive plate by unscrewing the fastening nut and the fixing nut, moving the positioning plate upward, placing the drive plate on the support plate, pressing the positioning plate down, and screwing the fastening nut and the fixing nut;

[0018] In the utility model, a simple test device for a low-voltage DC variable frequency pump driver is described. The power interface of the driver board is connected to the wiring socket of the test power supply through a guide, and then the test power supply is turned on to provide voltage to the driver board, and the static current observation method is used to determine whether each power module of the driver board is working normally. Then, the simulation operation is performed to collect each current value under different states of startup operation and fault, and the current values ​​under different states are used to determine whether each power module of the driver board is working normally.

[0019] The utility model has a reasonable structural design. Six vulnerable probe contacts required for voltage collection contacts can be reduced to only two vulnerable probe contacts for power input, thereby reducing equipment maintenance costs. Only one current value needs to be observed to determine whether a product is qualified, thereby improving test efficiency. The simulated load test method is used without the need for actual fluid load equipment, thus saving space and costs. The simulated load test method takes less time and improves test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a simple test device for a low-voltage DC variable frequency pump driver proposed by the utility model;

[0021] Figure 2 This is a three-dimensional structural diagram of the test power supply proposed by the utility model;

[0022] Figure 3 It is a schematic diagram of the side cross-sectional structure of the test work proposed by the utility model;

[0023] Figure 4 This is a schematic diagram of the split three-dimensional structure of the test work proposed by the utility model.

[0024] In the figure: 1. test power supply; 101. display screen; 1011. voltage display area; 1012. current display area; 102. control button; 103. terminal block; 104. power button; 2. base; 3. support plate; 4. positioning plate; 5. guide column; 6. guide cylinder; 7. fastening screw; 8. fastening nut; 9. pad; 10. fixing screw; 11. fixing nut; 12. fixing rod; 13. washer. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] Reference Figure 1-4 , a simple test device for low voltage DC variable frequency pump driver, comprising:

[0027] Test power supply 1, used to provide voltage to the driver board to be tested and collect current values. Test power supply 1 adopts a high-resolution programmable DC power supply;

[0028] The test tooling includes a base 2, a support plate 3 and a positioning plate 4. The support plate 3 is arranged between the base 2 and the positioning plate 4, and both sides of the top of the support plate 3 are fixedly connected with fastening screws 7. The positioning plate 4 is movably sleeved on the outer sides of the two fastening screws 7, and the outer sides of the fastening screws 7 are threadedly sleeved with fastening nuts 8, and the fastening nuts 8 are movably abutted against the top of the positioning plate 4.

[0029] In this embodiment, a display screen 101, a control button 102, a power button 104 and three terminal sockets 103 are provided on the front side of the test power supply 1. The display screen 101 includes a voltage display area 1011 and a current display area 1012. The minimum resolution of the test power supply 1 is 1mA.

[0030] In this embodiment, two guide columns 5 are fixedly connected to the top of the base 2, the support plate 3 is fixedly sleeved on the outside of the two guide columns 5, and two guide cylinders 6 are fixedly installed on the top of the positioning plate 4, and the two guide cylinders 6 are slidably sleeved on the outside of the corresponding guide columns 5 respectively.

[0031] In this embodiment, a fixing screw 10 is fixedly installed on the bottom rear side of the base 2, the support plate 3 and the positioning plate 4 are movably sleeved on the outside of the fixing screw 10, and the outer side of the fixing screw 10 is threadedly sleeved with a fixing nut 11, and the number of the fixing nuts 11 is at least two.

[0032] In this embodiment, two fixing rods 12 are fixedly installed on the top of the base 2, the support plate 3 is fixedly sleeved on the outside of the fixing rods 12, and the positioning plate 4 is slidably sleeved on the outside of the fixing rods 12, so as to guide the positioning plate 4.

[0033] In this embodiment, a backing plate 9 is movably sleeved on the outer side of the fastening screw 7 , and the backing plate 9 movably abuts between the supporting plate 3 and the positioning plate 4 to support the positioning plate 4 .

[0034] In this embodiment, a washer 13 is fixedly sleeved on the outer side of the fixing screw 10 , and the washer 13 is movably abutted between the supporting plate 3 and the positioning plate 4 , so as to support the positioning plate 4 .

[0035] In this embodiment, when in use, the drive plate is placed on the support plate 3 by unscrewing the fastening nut 8 and the fixing nut 11, and moving the positioning plate 4 upward, and then the positioning plate 4 is pressed down, and the fastening nut 8 and the fixing nut 11 are screwed to fix the drive plate;

[0036] Static test: connect the power interface of the driver board to the terminal block 103 of the test power supply 1 through the guide; then turn on the test power supply 1 to provide voltage to the driver board, and use the static current observation method to determine whether each power module of the driver board is working normally;

[0037] Dynamic test: Then simulate the operation to collect various current values ​​under different states of startup and fault, and judge whether each power module of the driver board is working normally according to the current values ​​under different states.

[0038] Typical failure sample test data analysis Static test data analysis

[0039]

[0040] The technical solution proposed based on the above test results is scientific and feasible.

[0041] Take 2000 sets of driver boards and test them in 2 groups of 1000 sets each. Test 1 group with the standard test method and test 2 groups with the simplified test method.

[0042] Test Group #1 #2 Time 360 minutes 110 minutes

[0043] Test data show that the simplified test method is three times more efficient than the standard test method.

[0044] The above is a detailed introduction to a simple test device for a low-voltage DC variable frequency pump driver provided by the utility model. This article uses specific embodiments to explain the principle and implementation of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A simple test device for low voltage DC variable frequency pump driver, characterized in that: include: A test power supply (1), used for providing voltage to the driver board to be tested and collecting current values, wherein the test power supply (1) adopts a high-resolution programmable DC power supply; A test fixture, the test fixture comprising a base (2), a support plate (3) and a positioning plate (4), the support plate (3) being arranged between the base (2) and the positioning plate (4), and both sides of the top of the support plate (3) being fixedly connected with fastening screws (7), the positioning plate (4) being movably sleeved on the outer sides of the two fastening screws (7), and the outer sides of the fastening screws (7) being threadedly sleeved with fastening nuts (8), and the fastening nuts (8) being movably abutted against the top of the positioning plate (4).

2. A simple test device for a low voltage DC variable frequency pump driver according to claim 1, characterized in that: The front side of the test power supply (1) is provided with a display screen (101), a control button (102), a power button (104) and three wiring sockets (103); the display screen (101) comprises a voltage display area (1011) and a current display area (1012); and the minimum resolution of the test power supply (1) is 1 mA.

3. A simple test device for a low voltage DC variable frequency pump driver according to claim 1, characterized in that: Two guide columns (5) are fixedly connected to the top of the base (2), the support plate (3) is fixedly sleeved on the outside of the two guide columns (5), and two guide cylinders (6) are fixedly installed on the top of the positioning plate (4), and the two guide cylinders (6) are respectively slidably sleeved on the outside of the corresponding guide columns (5).

4. A simple test device for a low voltage DC variable frequency pump driver according to claim 1, characterized in that: A fixing screw (10) is fixedly installed on the rear side of the bottom of the base (2), the support plate (3) and the positioning plate (4) are both movably sleeved on the outside of the fixing screw (10), and a fixing nut (11) is threadedly sleeved on the outside of the fixing screw (10), and the number of the fixing nuts (11) is at least two.

5. A simple test device for a low voltage DC variable frequency pump driver according to claim 1, characterized in that: Two fixing rods (12) are fixedly mounted on the top of the base (2), the support plate (3) is fixedly sleeved on the outside of the fixing rods (12), and the positioning plate (4) is slidably sleeved on the outside of the fixing rods (12).

6. A simple test device for a low voltage DC variable frequency pump driver according to claim 1, characterized in that: A backing plate (9) is movably sleeved on the outer side of the fastening screw (7), and the backing plate (9) is movably abutted between the supporting plate (3) and the positioning plate (4).

7. A simple test device for a low voltage DC variable frequency pump driver according to claim 4, characterized in that: A washer (13) is fixedly sleeved on the outer side of the fixing screw rod (10), and the washer (13) is movably abutted between the supporting plate (3) and the positioning plate (4).

Images