Test fixture

Abstract

The utility model discloses a test fixture for the test of sensing assembly and magnetic assembly in flow switch, sensing assembly includes dry reed, and magnetic assembly includes valve body and magnet, and magnet is movably installed on valve body, and test fixture includes fixture main part and test assembly, and test assembly, sensing assembly and valve body are all fixedly installed on fixture main part, and test assembly is used for pushing magnet to move to change the distance between magnet and dry reed, and measures moving stroke. The test fixture can conveniently and effectively test sensing assembly and magnetic assembly of the flow switch that has not been installed into finished product, avoids repeatedly disassembling time consumption, and greatly improves product assembly efficiency and qualification rate.

Description

Technical Field

[0001] This utility model belongs to the field of sensor testing technology, and specifically relates to a testing fixture. Background Technology

[0002] In existing technologies, testing flow switches requires installing them on a calibration platform, adjusting the flow rate data on the platform to a specified range, and then fine-tuning the flow rate data to activate the flow switch. This process consumes a significant amount of adjustment time, resulting in wasted time on installation, disassembly, and debugging. Furthermore, the pass rate for tested flow switches is low; defective flow switches require replacement of key components before retesting on the calibration platform, further consuming considerable time and leading to very low product assembly efficiency.

[0003] In flow switches, the cutting and soldering of the pins on both sides of the reed switch will affect the switching magnetic field strength of the reed switch itself. The magnetic field strength of the finished magnet surface also has a certain deviation. If the switching magnetic field strength of the reed switch and the surface magnetic field strength of the magnet cannot match within the tolerance range, the spring stroke will also be outside the specified range, which will affect the flow trigger threshold of the flow switch and cause the finished flow switch to be unqualified.

[0004] Existing calibration platforms can only adjust flow rate data and cannot effectively measure the magnetic field strength of the magnet at the reed switch contact. Furthermore, the magnetic field strength of the reed switch contact after welding and cutting cannot be measured. Therefore, the magnetic field strength matching between the magnet and reed switch in the finished flow switch cannot be effectively measured.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a test fixture that can conveniently and quickly test the matching status of components in a flow switch.

[0007] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0008] A test fixture is provided for testing a sensing component and a magnetic component in a flow switch. The sensing component includes a reed switch, and the magnetic component includes a valve body and a magnet. The magnet is movably mounted on the valve body. The test fixture includes a fixture body and a test component. The test component, the sensing component, and the valve body are all fixedly mounted on the fixture body. The test component is used to push the magnet to move, thereby changing the distance between the magnet and the reed switch, and to measure the movement stroke.

[0009] A specific embodiment of this utility model also provides a test fixture for testing the sensing component and magnet in a flow switch. The sensing component includes a reed switch. The test fixture includes a fixture body, a test component, a valve body, and a mounting component. The magnet is movably mounted on the valve body via the mounting component. The test component, the sensing component, and the valve body are all fixedly mounted on the fixture body. The test component is used to push the magnet to move, thereby changing the distance between the magnet and the reed switch, and measuring the movement stroke.

[0010] In one or more embodiments of the present invention, the mounting assembly includes a valve core, the magnet is mounted inside the valve core, and the valve body is movably sleeved outside the valve core.

[0011] In one or more embodiments of this utility model, the mounting assembly further includes a spring, the spring being sleeved outside the valve core, one end of the spring being fixedly mounted to the valve body, and the other end being fixedly mounted to the valve core; and / or

[0012] The mounting assembly also includes a limiting ring, which is sleeved on the outside of the valve core and fixedly installed with the valve body. The limiting ring is used to limit the valve core.

[0013] In one or more embodiments of this utility model, the fixture body includes a base plate, a first mounting base and a second mounting base. The first mounting base and the second mounting base are fixedly installed on the base plate. The first mounting base has a receiving cavity. The valve body is installed in the receiving cavity. The sensing component is installed on the first mounting base. The testing component is installed on the second mounting base. The first mounting base and the second mounting base are arranged sequentially along the direction of movement of the magnet.

[0014] In one or more embodiments of this utility model, a clamp is provided on the main body of the fixture, and the valve body is engaged and fixed with the clamp; and / or

[0015] The fixture body is provided with a limiting part for limiting the position of the sensing component.

[0016] In one or more embodiments of the present invention, the test fixture further includes a fixing component fixedly installed with the fixture body, the fixing component being used to fix the sensing component.

[0017] In one or more embodiments of this utility model, the fixing component includes a pressure plate and a screw. The pressure plate and the fixture body respectively abut against two opposite sides of the sensing component. The pressure plate has a through hole, and the fixture body has a screw hole. The screw passes through the through hole and is screwed into the screw hole for fixation.

[0018] In one or more embodiments of this invention, the test component includes a differential head.

[0019] In one or more embodiments of the present invention, the test fixture further includes an indicator module connected to the reed switch to issue an indicator signal based on the closure of the reed switch.

[0020] Compared with existing technologies, the testing fixture of this invention first installs the sensing component and the magnetic component during testing. Then, it moves the magnet closer to the reed switch, causing the reed switch to sense the magnetic field and close. The magnet's travel distance is then read and compared with a qualified travel range. If the travel distance falls within the qualified range, the sensing component and the magnetic component are considered compatible. This testing fixture can conveniently and effectively test the sensing and magnetic components of flow switches that are not yet assembled into finished products, avoiding the time wasted on repeated disassembly and assembly, and greatly improving product assembly efficiency and yield. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a sensing component in the prior art.

[0023] Figure 2 This is a schematic diagram of the overall structure of the test fixture in one embodiment of the present invention.

[0024] Figure 3 This is a cross-sectional schematic diagram of the test fixture in one embodiment of the present invention.

[0025] Figure 4 This is a partial structural schematic diagram of the test fixture in one embodiment of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0027] The terms "coupled," "connected," or "linked" in this specification include both direct and indirect connections. Indirect connections are those made through an intermediate medium, such as those made through an electrically conductive medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in this specification, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0028] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.

[0029] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0030] For the purposes of this application, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this application, the phrase "A, B and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0031] Various components and devices may be mentioned or shown in the singular form herein, but only for the convenience of discussion, and any element mentioned in the singular form may include multiple such elements as taught herein.

[0032] The description uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," each of which can refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used in relation to embodiments of this application are synonymous.

[0033] Example 1

[0034] The test fixture in one embodiment of this utility model is used for testing the sensing component 10 and magnet 20 in a flow switch.

[0035] like Figure 1 As shown, in one embodiment, the sensing assembly 10 may include a reed switch 11, a circuit board 12, a cable 13, and a housing 14. The reed switch 11 is connected and fixed to the circuit board 12 by soldering, and the circuit board 12 is connected and fixed to the cable 13 by soldering. The reed switch 11 and the circuit board 12 are installed in a slot inside the housing 14, and the slot is sealed with glue. In other embodiments, the sensing assembly 10 may have other structures, as long as it includes the reed switch 11.

[0036] Combination Figure 2 , 3 As shown in Figure 4, the test fixture includes a fixture body 30, a test component 40, a valve body 50, and a mounting component 60. The magnet 20 is movably mounted on the valve body 50 via the mounting component 60. The test component 40, the sensing component 10, and the valve body 50 are all fixedly mounted on the fixture body 30. The test component 40 is used to push the magnet 20 to move, thereby changing the distance between the magnet 20 and the reed switch 11, and measuring the movement stroke.

[0037] The mounting assembly 60 includes a valve core 61, a spring 62, and a limiting ring 63. A magnet 20 is installed inside the valve core 61, and a valve body 50 is movably sleeved on the outside of the valve core 61. For example, the valve core 61 has a cavity at its front end, the magnet 20 is fixedly installed in this cavity, and a sealing head 64 is also provided at the front end of the valve core 61 to seal the cavity. The valve body 50 can move within a certain range at the rear end of the valve core 61.

[0038] A spring 62 is sleeved on the outside of the valve core 61. One end of the spring 62 is fixedly installed to the valve body 50, and the other end is fixedly installed to the valve core 61, so that it can actively return to its original position after the relative position of the valve core 61 and the valve body 50 changes. A limiting ring 63 is sleeved on the outside of the valve core 61 and fixedly installed to the valve body 50. The limiting ring 63 is used to limit the valve core 61. For example, the limiting ring 63 is sleeved on the rear end of the valve core 61, and the diameter of the rear end portion of the valve core 61 is increased so that the limiting ring 63 is locked in place and does not fall off. In other embodiments, the spring 62 or the limiting ring 63 may not be provided.

[0039] Combination Figure 2 and Figure 3As shown, the fixture body 30 includes a base plate 31, a first mounting base 32, and a second mounting base 33. The first mounting base 32 and the second mounting base 33 are fixedly mounted to the base plate 31. The first mounting base 32 has a receiving cavity 321, and the valve body 50 is installed in the receiving cavity 321. The sensing component 10 is mounted on the first mounting base 32; for example, the sensing component 10 is mounted on the top of the first mounting base 32. The testing component 40 is mounted on the second mounting base 33. The first mounting base 32 and the second mounting base 33 are arranged sequentially along the direction of movement of the magnet 20 (valve core 61) to facilitate the testing component 40 in pushing the valve core 61 to move.

[0040] Preferably, the first mounting base 32, valve body 50 and mounting assembly 60 can be designed according to the relative positional relationship between the sensing component 10 and the magnet 20 in the actual flow switch to be tested, so that after the sensing component 10 and valve body 50 are mounted on the first mounting base 32, the positional relationship between the magnet 20 and the sensing component 10 is consistent with that in the actual flow switch to be tested.

[0041] Furthermore, a clamp 322 is provided on the first mounting base 32, and the valve body 50 is engaged and fixed with the clamp 322. The clamp 322 can be located inside the receiving cavity 321.

[0042] Furthermore, the first mounting base 32 is provided with a limiting part 323 for limiting the position of the sensing component 10. For example, the limiting part 323 may be provided at the top of the first mounting base 32.

[0043] In one embodiment, the test fixture further includes a fixing component fixedly mounted to the fixture body 30, the fixing component being used to fix the sensing component 10.

[0044] The fixing assembly includes a pressure plate 71 and a screw 72. The pressure plate 71 and the fixture body 30 abut against opposite sides of the sensing assembly 10, i.e., the pressure plate 71 abuts against the upper surface of the sensing assembly 10, and the first mounting base 32 abuts against the lower surface of the sensing assembly 10. The pressure plate 71 has a through hole (not shown in the figure), and the first mounting base 32 has a screw hole 324. The screw 72 passes through the through hole and is screwed into the screw hole 324 for fixation. By tightening the screw 72, the head of the screw 72 abuts against the pressure plate 71, fixing the pressure plate 71 onto the first mounting base 32 and pressing the pressure plate 71 against the sensing assembly 10.

[0045] Combination Figure 2 and Figure 3 As shown, the test assembly 40 includes a micrometer head. A mounting hole can be provided on the second mounting base 33, the position of which corresponds to the valve core 61. The front end of the micrometer head passes through the mounting hole and is locked onto the second mounting base 33 by a nut. By turning the adjustment knob of the micrometer head, the probe of the micrometer head can push the magnet 20 (valve core 61) to move.

[0046] In one embodiment, the test fixture may further include an indicator module (not shown) connected to a reed switch 11 to issue an indicator signal based on the closure of the reed switch 11. Exemplarily, the indicator module is connected to the reed switch 11 via a cable 13 and a circuit board 12. Preferably, the indicator module may include a buzzer.

[0047] During the test, magnet 20 is first installed on valve body 50 via mounting assembly 60. Then, sensor assembly 10 and valve body 50 are installed on first mounting base 32. Cable 13 is then connected to a buzzer. The adjustment knob of the micrometer head is rotated to push valve core 61 forward, causing magnet 20 to gradually approach reed switch 11. When the buzzer sounds, the forward distance of the micrometer head is read and compared with the acceptable stroke range. If it falls within the acceptable stroke range, it can be determined that reed switch 11 in sensor assembly 10 matches magnet 20. The acceptable stroke range can be derived from products that have passed flow test data. If the micrometer head reading does not fall within the acceptable stroke range, it is determined that magnet 20 and reed switch 11 are mismatched, and magnet 20 or reed switch 11 can be replaced and the test repeated. This eliminates the cumbersome step of testing product compliance using flow rate through a flow switch calibration platform, allowing for advance prediction of product compliance. If repeated testing still fails to pair magnet 20 and reed switch 11, sensor assembly 10 can be replaced and the test repeated.

[0048] Example 2

[0049] The test fixture in one embodiment of this utility model is used for testing the sensing components and magnetic components in a flow switch.

[0050] The sensing component can be the one combined with the one in embodiment 1. Figure 1 The described sensing component 10.

[0051] The magnetic component includes a valve body and a magnet, with the magnet movably mounted on the valve body. In one embodiment, the magnetic component may further include a mounting assembly, through which the magnet is movably mounted on the valve body. Exemplarily, the structure, mounting method, and operating principle of the magnet, mounting assembly, and valve body are combined with those in Embodiment 1. Figure 4 The magnet 20, mounting assembly 60 and valve body 50 described herein have the same structure, installation method and working principle, and will not be repeated here.

[0052] When the flow switch is operating normally, the sensing and magnetic components are mounted close to the flow switch. In the absence of flow, the spring naturally extends, moving the magnet away from the reed switch, causing the reed switch contacts to separate. When fluid flows in, it pushes the valve core to move, the spring contracts, and the distance the magnet moves is directly proportional to the flow rate. When the flow rate exceeds a certain threshold, the magnet moves to a position that just closes the reed switch contacts, and the sensing component will issue an alarm signal.

[0053] The test fixture includes a fixture body and a test assembly. The test assembly, sensing assembly, and valve body are all fixedly mounted on the fixture body. The test assembly is used to move a magnet to change the distance between the magnet and the reed switch, and to measure the movement stroke. Specifically, the fixture body and test assembly in this embodiment are combined with those in Embodiment 1. Figure 2 , Figure 3 The fixture body 30 and the test component 40 described herein are identical in structure, installation method and working principle, and will not be described in detail here.

[0054] In one embodiment, the test fixture may further include an indicator module connected to a reed switch to generate an indicator signal based on the closure of the reed switch. Exemplarily, the indicator module is connected to the reed switch via a cable and a circuit board. Preferably, the indicator module may include a buzzer.

[0055] During the testing process, the valve body of the sensor component and magnetic component under test are first installed on the fixture body. Then, the cable of the sensor component is connected to the buzzer. The adjustment knob of the micrometer head is then rotated to push the valve core in the magnetic component forward, causing the magnet to gradually approach the reed switch. When the buzzer sounds, the forward distance of the micrometer head is read and compared with the acceptable travel range. If it falls within the acceptable travel range, it can be determined that the reed switch in the sensor component and the magnet in the magnetic component are matched. The acceptable travel range can be derived from products that have passed flow rate testing. If the micrometer head reading does not fall within the acceptable travel range, it is determined that the magnet and reed switch are mismatched, and the magnet or reed switch can be replaced and the test repeated. This eliminates the cumbersome step of testing the product's compliance using flow rate through a flow switch calibration platform, allowing for advance prediction of product compliance. If repeated testing still fails to pair the magnet and reed switch, the sensor component can be replaced and the test repeated.

[0056] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A test fixture for testing the sensing components and magnetic components in a flow switch, characterized in that, The sensing component includes a reed switch, the magnetic component includes a valve body and a magnet, the magnet is movably mounted on the valve body, the test fixture includes a fixture body and a test component, the test component, the sensing component and the valve body are all fixedly mounted on the fixture body, the test component is used to push the magnet to move, so as to change the distance between the magnet and the reed switch, and measure the movement stroke.

2. A test fixture for testing sensing components and magnets in a flow switch, characterized in that, The sensing component includes a reed switch, and the test fixture includes a fixture body, a test component, a valve body, and a mounting component. The magnet is movably mounted on the valve body via the mounting component. The test component, the sensing component, and the valve body are all fixedly mounted on the fixture body. The test component is used to push the magnet to move, thereby changing the distance between the magnet and the reed switch, and measuring the movement stroke.

3. The test fixture according to claim 2, characterized in that, The mounting assembly includes a valve core, the magnet is mounted inside the valve core, and the valve body is movably sleeved on the outside of the valve core.

4. The test fixture according to claim 3, characterized in that, The mounting assembly further includes a spring sleeved around the valve core, one end of the spring being fixedly mounted to the valve body and the other end being fixedly mounted to the valve core; and / or The mounting assembly also includes a limiting ring, which is sleeved on the outside of the valve core and fixedly installed with the valve body. The limiting ring is used to limit the valve core.

5. The test fixture according to claim 1 or 2, characterized in that, The fixture body includes a base plate, a first mounting base and a second mounting base. The first mounting base and the second mounting base are fixedly installed on the base plate. The first mounting base has a receiving cavity, and the valve body is installed in the receiving cavity. The sensing component is installed on the first mounting base, and the testing component is installed on the second mounting base. The first mounting base and the second mounting base are arranged sequentially along the direction of the magnet's movement.

6. The test fixture according to claim 1 or 2, characterized in that, The fixture body is provided with a clamp, and the valve body is engaged and fixed with the clamp; and / or The fixture body is provided with a limiting part for limiting the position of the sensing component.

7. The test fixture according to claim 1 or 2, characterized in that, The test fixture also includes a fixing component that is fixedly installed with the fixture body, the fixing component being used to fix the sensing component.

8. The test fixture according to claim 7, characterized in that, The fixing component includes a pressure plate and screws. The pressure plate and the fixture body abut against opposite sides of the sensing component. The pressure plate has a through hole, and the fixture body has a screw hole. The screw passes through the through hole and is screwed into the screw hole for fixation.

9. The test fixture according to claim 1 or 2, characterized in that, The test component includes a differential head.

10. The test fixture according to claim 1 or 2, characterized in that, The test fixture also includes an indicator module connected to the reed switch to issue an indicator signal based on the closure of the reed switch.

Images