Safety test device

Abstract

The invention discloses a safety test device, which is used for carrying out an electrical safety test on a pressure switch, the pressure switch comprises a wiring terminal and a copper pipe, one end of the wiring terminal is connected with one end of the copper pipe, the other end of the copper pipe is provided with an air inlet, and the safety test device comprises an insulating support plate, the test bench is provided with a plurality of test stations for placing pressure switches; the test interface assembly is installed on the test station, the test interface assembly comprises a telescopic probe and a movable wire holder connected with the telescopic probe, the telescopic probe is connected with the air inlet, and the movable wire holder is connected with the other end of the wiring terminal and can be matched with the wiring terminal in a preset size range; and the parallel test circuit comprises two access points, and the two access points are connected with the plurality of test stations at the same time. According to the embodiment of the invention, the electrical safety test of various pressure switches is met, and the problems of low test efficiency and no universal tool are solved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical safety testing of a pressure switch for an air conditioner, and in particular to a safety testing device. Background Art

[0002] A pressure switch is a device used to control the on / off of circuits in air conditioning systems. Its main function is to protect the compressor and other components according to changes in system pressure. Its working principle is that when the pressure in the air conditioning system is higher or lower than the set safety pressure, the disc inside the pressure-sensitive plate inside the pressure switch will move instantaneously. This movement pushes the switch connector to disconnect through the action of the connecting guide rod, thereby cutting off the circuit and ensuring that the air conditioning system will not continue to operate under high or low pressure to prevent damage to the equipment. Once the system pressure returns to the rated value, the disc will reset instantly, driving the switch to automatically reset and resume working.

[0003] In order to ensure the electrical safety of the pressure switch, it is required to conduct an electrical safety test on the pressure switch in accordance with the requirements of GB 14536.1. The specific operation of the test is: apply a sinusoidal AC voltage between the terminal of the pressure switch and the metal part of the shell, the voltage value is 1500V, the frequency is 50Hz or 60Hz, and the leakage current setting value is set to 1mA. The test needs to last for 1 minute (or you can choose to apply a voltage of 1800V for 1 second as an alternative). However, since the existing devices for electrical safety testing of pressure switches usually adopt a single-station design, and the test station is not universal, the pressure switches can only be tested one by one, which is not only inefficient, but also cannot meet the testing of pressure switches of different models. Summary of the invention

[0004] The purpose of the present invention is to provide a safety testing device, aiming to solve the problems of low testing efficiency and lack of universality of the safety testing device in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a safety test device for performing an electrical safety test on a pressure switch, wherein the pressure switch comprises a wiring terminal and a copper tube, one end of the wiring terminal is connected to one end of the copper tube, and the other end of the copper tube is provided with an air inlet, and the safety test device comprises:

[0007] An insulating support plate provided with a plurality of test stations for placing the pressure switch;

[0008] A test interface assembly is installed on the test station, the test interface assembly comprises a retractable probe and a movable wiring seat connected to the retractable probe, the retractable probe is connected to the air inlet, and the movable wiring seat is connected to the other end of the wiring terminal and can adapt to the wiring terminal within a predetermined size range;

[0009] The parallel test circuit comprises two access points, and the two access points are connected to the plurality of test stations at the same time.

[0010] Optionally, the two access points include a first access point and a second access point, the first access point is simultaneously connected in parallel with the retractable probes on the plurality of test stations, and the second access point is simultaneously connected in parallel with the movable wiring sockets on the plurality of test stations.

[0011] Optionally, a test device is further included, wherein the test device includes a first interface and a second interface connected to the parallel test circuit, and the first interface and the second interface are connected to the first access point and the second access point respectively.

[0012] Optionally, the predetermined size range is the spacing range between the terminals of the wiring terminal, and the predetermined size range is 12-20 mm.

[0013] Optionally, the retractable probe can be adapted to a pressure switch with a total height of 80-100 mm.

[0014] Optionally, the insulating support plate is an epoxy plate.

[0015] Optionally, the epoxy board includes multiple pieces, and the epoxy boards are connected by connecting pieces.

[0016] Optionally, the number of the testing stations is at least 10.

[0017] Optionally, the movable wiring seat includes a wiring seat body, an elastic member with one end abutting against the wiring seat body, and a wiring seat interface abutting against the other end of the elastic member.

[0018] Optionally, the wiring seat body is provided with an access port, the wiring seat interfaces are provided with two and are spaced apart from the access port, and the elastic members are provided with two and are respectively provided on the back sides of the two wiring seat interfaces.

[0019] The present invention provides a safety testing device. In an embodiment of the present invention, a plurality of test stations are arranged on an insulating support plate, and are connected to the plurality of test stations through a parallel test circuit, so that a plurality of pressure switches can be subjected to electrical safety tests at the same time, thereby significantly improving the test efficiency. At the same time, the design of a movable wiring seat and a retractable probe enables the safety testing device to adapt to pressure switches of various sizes and specifications, thereby solving the problem that traditional safety testing devices lack universal tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a pressure switch provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the structure of a safety testing device provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of the connection between the pressure switch and the test interface assembly provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a structure in which a pressure switch provided by an embodiment of the present invention is installed in a safety testing device;

[0025] Figure 5 A schematic diagram of the installation structure of a pressure switch and an epoxy plate provided in an embodiment of the present invention.

[0026] Description of the symbols in the figure:

[0027] 100, pressure switch; 101, terminal; 1011, terminal post; 102, copper tube; 1021, air inlet;

[0028] 200, safety test device; 201, insulating support plate; 202, test interface assembly; 2021, retractable probe; 2022, movable terminal block; 203, parallel test circuit; 2031, two access points; 20311, first access point; 20312, second access point. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0031] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0032] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0033] See also Figures 1 to 4 The embodiment of the present invention provides a safety testing device for performing an electrical safety test on a pressure switch 100. The pressure switch 100 includes a terminal 101 and a copper tube 102. One end of the terminal 101 is connected to one end of the copper tube 102. The other end of the copper tube 102 is provided with an air inlet 1021. The safety testing device 200 includes: an insulating support plate 201, which is provided with a plurality of test stations for placing the pressure switch 100; a test interface assembly 202, which is installed on the test station. The test interface assembly 202 includes a retractable probe 2021 and a movable wiring seat 2022 connected to the retractable probe 2021. The retractable probe 2021 is connected to the air inlet 1021. The movable wiring seat 2022 is connected to the other end of the terminal 101 and can adapt to the terminal 101 within a predetermined size range; a parallel test circuit 203, which includes two access points 2031. The two access points 2031 are connected to multiple test stations at the same time.

[0034] In this embodiment, by setting up multiple test stations on the insulating support plate 201 and connecting with the multiple test stations through a parallel test circuit 203, multiple pressure switches 100 can be subjected to electrical safety tests at the same time, thereby improving the test efficiency; at the same time, the design of the retractable probe 2021 and the movable wiring socket 2022 enables the safety testing device 200 to adapt to pressure switches 100 of various sizes and specifications, thereby solving the problem of the lack of universal tooling in the traditional safety testing device 200.

[0035] Further, such as Figure 4 As shown, the two access points 2031 include a first access point 20311 and a second access point 20312. The first access point 20311 is connected in parallel with the retractable probes 2021 on multiple test stations, and the second access point 20312 is connected in parallel with the movable wiring sockets 2022 on multiple test stations.

[0036] In this embodiment, the first access point 20311 is connected in parallel with the retractable probes 2021 on all test stations through a wire or a conductive sheet to form an electrical parallel circuit. Similarly, the second access point 20312 is connected in parallel with the movable wiring sockets 2022 on all test stations to ensure that the wiring terminals 101 of all pressure switches 100 can be connected to the parallel test circuit 203 through the second access point 20312. Through the parallel design of the two access points, the first access point 20311 and the second access point 20312, the safety test device 200 can send test signals to the pressure switches 100 on all test stations at the same time without having to test them one by one, thereby significantly improving the test efficiency.

[0037] Furthermore, a test device is also included, and the test device includes a first interface and a second interface connected to the parallel test circuit 203, and the first interface and the second interface are connected to the first access point 20311 and the second access point 20312 respectively. In this embodiment, the test device sends a test signal to the parallel test circuit 203 through the first interface and the second interface, and receives the test result from the parallel test circuit 203. The test device also includes a test signal processing module and a display module. The test signal processing module is used to process the test signal of the pressure switch 100 sent from the parallel test circuit 203. At the same time, the test device can also receive the test result from the parallel test circuit 203 for further analysis and processing; the display module is used to display the test result and test parameters. The test device can display the test result to the tester through the display module, including whether the test is passed, the test time, the test voltage and other information. At the same time, the tester can also set the test parameters, such as the test voltage, the test time, etc., through the display module.

[0038] Specifically, the test equipment may be a safety meter, which is a special device that can measure key parameters of electrical products such as voltage, current, insulation resistance, and ground resistance, and is used to evaluate the safety performance of the product.

[0039] The safety meter is provided with a positive electrode and a negative electrode, and the first access point 20311 is set as the positive electrode, and the second access point 20312 is set as the negative electrode. The first access point 20311 is connected to the positive electrode (first interface) output end of the safety meter, and the second access point 20312 is connected to the negative electrode (second interface) output end of the safety meter. At each test station, the test interface assembly 202 (including the retractable probe 2021 and the movable wiring seat 2022) is connected to the first access point 20311 and the second access point 20312 of the parallel test circuit 203 through a wire, ensuring that each test station can receive the test signal from the safety meter.

[0040] In a specific embodiment, the predetermined size range is the spacing range of the connecting posts 1011 of the connecting terminal 101, and the predetermined size range is 12-20 mm. Figure 1 As shown, the spacing between the terminal posts 1011 of the pressure switch 100 is d. The spacing d between the posts 1011 of the terminal 101 of the pressure switch 100 of different models is different, which may be 14mm, 15mm, 16mm or 17mm. This diversity brings challenges to the testing work, because the traditional fixed-pitch terminal block cannot meet the requirements of these different spacings at the same time. If the test system is only equipped with a terminal block with a fixed spacing (for example, 14mm), that is, if the spacing of the fixed mobile terminal block is 14mm, other models of pressure switches 100 cannot be tested, so a mobile terminal block 2022 is used, and the predetermined size range is the spacing range of the posts 1011 of the terminal 101, so that the mobile terminal block can meet the testing requirements of pressure switches 100 with different spacings between the posts 1011. Therefore, the predetermined size range is set to between 12-20mm, and the predetermined size range is obtained based on extensive research and analysis of mainstream pressure switch models on the current market.

[0041] In a specific application scenario, a suitable mobile terminal block 2022 is selected according to the spacing between the terminals 1011 of the pressure switch 100 to be tested, and the pressure switch 100 is installed on the test station to ensure that the mobile terminal block can adapt to the terminal 101 of the pressure switch 100.

[0042] Furthermore, the total height of the pressure switch 100 that the retractable probe 2021 can adapt to is 80-100 mm. In this embodiment, since the total height of the pressure switch 100 may vary, the retractable probe 2021 can be used flexibly to ensure that most types of pressure switches 100 can fully contact the probe.

[0043] In the actual test process, a spring is provided at the end of the retractable probe 2021 to match the pressure switches 100 of different heights to ensure that the end of the retractable probe 2021 can be aligned exactly with the air inlet 1021 of the copper tube 102 of the pressure switch 100. Once the height of the retractable probe 2021 is adjusted, the tester can gently push the retractable probe 2021 into the air inlet 1021 of the copper tube 102 to establish an electrical connection. In this process, it is necessary to ensure that the contact between the retractable probe 2021 and the air inlet 1021 is sufficient to avoid test errors caused by poor contact. Finally, the test signal is sent through the parallel test circuit 203 and the test equipment to perform an electrical safety test.

[0044] In a specific embodiment, the insulating support plate 201 is an epoxy plate. The epoxy plate has good dielectric properties, that is, its insulation performance is good and can effectively prevent current leakage. In a high humidity environment, the electrical performance of the epoxy plate remains stable and its insulation effect will not be affected by humidity changes. At the same time, it can also resist moisture erosion and prevent the insulation performance from being reduced due to excessive humidity.

[0045] Further, combined with Figure 4 and Figure 5 As shown, the epoxy board includes multiple pieces, and each epoxy board is connected by a connector. In this embodiment, in order to make the safety test device 200 more stable and durable, multiple epoxy boards are used and fixed together by connectors to form an integral structure, which helps to ensure the stability and durability of the structure. Figure 5 It can be seen from the figure that the epoxy board is divided into two pieces, the upper and lower pieces, and the two epoxy boards are connected by a connector.

[0046] In practical applications, the connectors can be fasteners such as bolts and nuts to ensure a firm connection between epoxy boards. Considering the quick installation and removal, the connectors can also use buckles, latches, etc. to connect and fix the epoxy boards, which can not only greatly improve the assembly efficiency of the test station; at the same time, they can also ensure a tight connection between the epoxy boards to avoid loosening or falling off during the test process.

[0047] In specific operations, testers can choose appropriate connectors according to actual needs. For situations that require heavy loads or vibrations, bolts and nuts can be selected for connection; for situations that require frequent disassembly or adjustment, connectors such as buckles and latches can be selected. This flexible selection method not only improves the adaptability of the test platform, but also provides more convenience for testers.

[0048] In a specific embodiment, the test stations include at least 10. In this embodiment, in order to be able to perform electrical safety tests on multiple pressure switches 100 at the same time, at least 10 test stations are set. In actual application scenarios, it can be expanded according to needs, and more test stations can be set to further shorten the test cycle. The test stations are arranged in a regular layout on the insulating support plate 201 to ensure that each test station can easily access the parallel test circuit 203 and have enough space for operation and observation.

[0049] It should be noted that the setting of the test station should also take safety into consideration to ensure that no dangerous situations such as short circuit and leakage occur during the test. At the same time, testers also need to wear appropriate protective equipment, such as insulating gloves, to ensure personal safety.

[0050] Furthermore, the mobile terminal block 2022 includes a terminal block body, an elastic member that is supported at one end on the terminal block body, and a terminal block interface that is supported at the other end of the elastic member. In the present embodiment, the terminal block body is usually made of insulating materials, such as plastic or epoxy resin, to ensure electrical safety. The terminal block interface is the part that the mobile terminal block 2022 is connected to the external wire or the terminal 101, and is usually designed to be easy to plug and unplug, such as a pin, a socket or a threaded connection, etc., to meet different connection requirements. The terminal block interface is usually made of metal materials with good electrical conductivity, such as copper or tinned copper, to ensure good electrical connection.

[0051] Furthermore, the main function of the elastic member (such as a spring or an elastic plastic sheet) is to provide elastic adaptability, so that the movable terminal block 2022 can be automatically adjusted according to the different spacings between the terminal posts 1011 of the pressure switch 100, ensuring that the terminal block can be in close contact with the terminal posts 1011 of pressure switches 100 of various sizes and shapes, thereby establishing a reliable electrical connection.

[0052] Specifically, the elastic member also plays a role in maintaining contact pressure during the wiring process. When the terminal 101 is connected to the terminal socket interface, if the spacing between the terminal posts 1011 of the terminal 101 is greater than the width of the terminal socket body, the elastic member will provide a certain pressure, so that the terminal posts 1011 squeeze the elastic member downward, and at the same time, the elastic member provides a rebound force to the terminal posts 1011 in the reverse direction, ensuring that the electrical connection between the two is tight and stable. Buffering and shock absorption: In the process of connecting and disconnecting the terminal posts 1011, the elastic member can also play a role in buffering and shock absorption, protecting the terminal socket interface and the terminal posts 1011 of the pressure switch 100 from damage.

[0053] It should be noted that, in addition to adapting pressure switches 100 of different sizes through the elastic action of the elastic member, the adaptation can also be performed by adjusting the position of the terminal block interface. Specifically, in order to facilitate the user to adjust the position of the terminal block interface, the mobile terminal block 2022 can be provided with an adjustment mechanism, which can be a knob, a slide rail or a buckle, etc. The tester can change the position and angle of the terminal block interface by operating these mechanisms, so as to adapt to pressure switches 100 of different sizes or specifications. In order to facilitate the tester to identify and adjust the position of the terminal block interface, the terminal block body can be marked with scale lines, indicator arrows or digital marks, etc. These marks can help the tester quickly find the correct adjustment position and ensure the precise alignment between the terminal block interface and the terminal 1011 of the pressure switch 100.

[0054] Furthermore, the terminal block body is provided with an access port, two terminal block interfaces are provided and are spaced apart at the access port, and two elastic members are provided and are respectively provided on the backs of the two terminal block interfaces. In the present embodiment, each terminal block interface is designed with a contact point or a pin that matches the terminal post 1011 to ensure the reliability of the electrical connection. Since there are two terminal block interfaces and they are spaced apart, under the action of the elastic member, the two terminal block interfaces can be moved and adjusted within a certain range in the access port. When the terminal block interface contacts the terminal posts 1011 of pressure switches 100 of different sizes, the elastic member will automatically adjust according to the spacing between the terminal posts 1011 to ensure that the terminal block interface can be in close contact with the terminal posts 1011 and establish a good electrical connection.

[0055] In summary, the safety test process of the pressure switch 100 includes: setting 10 test stations on the insulating support plate 201, installing a test interface assembly 202 on each test station, and ensuring that the test interface assembly 202 on each test station can be correctly connected to the pressure switch 100 to be tested. First, place the pressure switch 100 to be tested on the corresponding test station, and use the retractable probe 2021 to connect to the air inlet 1021 of the copper tube 102 of the pressure switch 100 to ensure a tight connection. Use a mobile wiring socket 2022 to connect to the terminal 101 of the pressure switch 100 to ensure that the connection is correct and stable. Next, set the test parameters on the test equipment, such as test voltage, test time, etc. Ensure that the first interface and the second interface of the test equipment are correctly connected to the first access point 20311 and the second access point 20312 of the parallel test circuit 203, and prepare for the next test. Next, according to the requirements of GB 14536.1, a sinusoidal AC voltage of 1500V (frequency 50Hz or 60Hz) is applied between the terminal 101 of the pressure switch 100 and the metal part of the housing, and the leakage current setting value is set to 1mA for 1 minute (or 1800V voltage can be applied for 1 second as an alternative) to check the electrical safety and insulation performance of the pressure switch 100 under high voltage environment. Finally, start the test equipment for testing and start sending test signals. The test signal is transmitted to the pressure switch 100 on each test station through the parallel test circuit 203, and the test equipment receives the test results from the parallel test circuit 203, and processes and analyzes them. The test equipment displays the test results through the display module, including information such as whether the test is passed, test time, and test voltage.

[0056] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0057] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0058] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A safety test device for performing an electrical safety test on a pressure switch, wherein the pressure switch comprises a wiring terminal and a copper tube, one end of the wiring terminal is connected to one end of the copper tube, and the other end of the copper tube is provided with an air inlet, characterized in that: The safety testing device comprises: An insulating support plate provided with a plurality of test stations for placing the pressure switch; A test interface assembly is installed on the test station, the test interface assembly comprises a retractable probe and a movable wiring seat connected to the retractable probe, the retractable probe is connected to the air inlet, and the movable wiring seat is connected to the other end of the wiring terminal and can adapt to the wiring terminal within a predetermined size range; The parallel test circuit comprises two access points, and the two access points are connected to the plurality of test stations at the same time.

2. The safety testing device according to claim 1, characterized in that: The two access points include a first access point and a second access point. The first access point is simultaneously connected in parallel with the retractable probes on the plurality of test stations, and the second access point is simultaneously connected in parallel with the movable wiring sockets on the plurality of test stations.

3. The safety testing device according to claim 2, characterized in that: It also includes a test device, which includes a first interface and a second interface connected to the parallel test circuit, and the first interface and the second interface are connected to the first access point and the second access point respectively.

4. The safety testing device according to claim 1, characterized in that: The predetermined size range is the spacing range of the connection posts of the connection terminal, and the predetermined size range is 12-20 mm.

5. The safety testing device according to claim 1, characterized in that: The retractable probe can be adapted to a pressure switch with a total height of 80-100 mm.

6. The safety testing device according to claim 1, characterized in that: The insulating support plate is an epoxy plate.

7. The safety testing device according to claim 6, characterized in that: The epoxy boards include a plurality of pieces, and the epoxy boards are connected by connecting pieces.

8. The safety testing device according to claim 1, characterized in that: The number of the testing stations is at least 10.

9. The safety testing device according to claim 1, characterized in that: The movable wiring seat comprises a wiring seat body, an elastic member with one end abutting against the wiring seat body, and a wiring seat interface abutting against the other end of the elastic member.

10. The safety testing device according to claim 9, characterized in that: The wiring seat body is provided with an access port, the wiring seat interfaces are provided with two and are spaced apart from the access port, and the elastic members are provided with two and are respectively provided on the back sides of the two wiring seat interfaces.

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