Multi-station automatic aging test equipment for PTC heater

Abstract

The invention discloses a multi-station automatic aging test device for a PTC heater, and the device comprises a test cabinet, one end of the test cabinet is provided with a master control cabinet, the test cabinet is internally provided with thirty independent test stations which are used for carrying out the water heating aging test of the PTC heater, and the top of each test station is provided with a control button. A water inlet pipe is connected to the outer side of the main water inlet pipe, branch pipes are connected to the outer side of the water inlet pipe, valve body modules are detachably installed at the ends of the water inlet pipe and the ends of the branch pipes, and T-shaped pipes are connected to the ends of the two valve body modules. The PTC heater aging test system has the advantages that by integrating thirty independent test stations, modular valve body control and an automatic water circulation system, parallel aging tests can be conducted on a large batch of PTC heaters at the same time, and the efficiency is high; the valve body module adopts a quick-release structural design, so that the maintenance or replacement of a single valve body module does not need to interrupt the whole test system, the production can be maintained by using a standby valve body module, and the downtime of equipment is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of testing technology for PTC heaters, specifically to a multi-station automatic aging test device for PTC heaters. Background Technology

[0002] PTC heaters are self-regulating heating elements widely used in liquid or air heating in automotive air conditioning, home appliances, and industrial equipment due to their high efficiency, safety, and stability. During the production of PTC heaters, rigorous aging tests are conducted on each product before shipment to assess their long-term reliability, stability, and electrical safety performance, simulating their actual operation under rated conditions. Water heating aging tests are a crucial step in this process. By introducing a cooling medium (usually water) at a specified temperature and flow rate into the PTC heater, it is continuously operated at its rated voltage to verify its heating performance, insulation performance, sealing performance, and long-term operational stability.

[0003] Traditional PTC heater water aging tests are typically conducted manually at single or a few stations. Operators need to connect pipes, set parameters, and record data one by one, which consumes a significant amount of manpower and time. In multi-batch or multi-operation scenarios, it's difficult to ensure that each tested PTC heater experiences completely consistent inlet water pressure, flow rate, and temperature. Existing testing equipment often has a dispersed layout of water circuits, electrical circuits, and control systems, with complex piping connections. The installation and maintenance of key valves used for regulating and controlling the water circuit remain unchanged, valve replacement is cumbersome, downtime is long, and testing efficiency is low. Furthermore, the aging test continuously generates a large amount of heat, requiring an efficient cooling water circulation system for heat dissipation. Existing systems may have shortcomings in water filtration and tank status monitoring; impurities entering the pipes may clog or damage valves and instruments, affecting test accuracy and equipment lifespan. Therefore, we propose a multi-station automated aging test device for PTC heaters. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-station automatic aging test device for PTC heaters to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-station automatic aging test equipment for PTC heaters, comprising a test cabinet, a main control cabinet at one end of the test cabinet, thirty independent test stations for performing water heating aging tests on PTC heaters inside the test cabinet, and control buttons at the top of the test stations, an inlet pipe connected to the outside of the main water inlet pipe, and a branch pipe connected to the outside of the inlet pipe, and valve modules detachably installed at the ends of the inlet pipe and the branch pipe; The ends of the two valve body modules are connected to T-shaped pipes. The ends of the water inlet pipe and the branch pipe, as well as both ends of the T-shaped end of the T-shaped pipe, are equipped with first control valves. The test cabinet is equipped with a water circulation system that provides cooling water to all workstations. The outside of the coolant tank inlet is equipped with a water inlet pipe, and the end of the water inlet pipe is equipped with a filter assembly. The water inlet end of the filter assembly is equipped with a connecting pipe for connecting to an external chiller. The test cabinet is equipped with a display instrument located above the test workstation.

[0006] Preferably, the water circulation system includes a coolant return tank and a coolant inlet tank. A main inlet water pipe is installed at the top of the test cabinet. A first water pump is fixedly installed on the outside of the coolant inlet tank, and the outlet of the first water pump is connected to the main inlet water pipe. The inlet of the first water pump is connected to the coolant inlet tank. A second water pump is installed on the outside of the coolant return tank. The inlet of the second water pump is connected to the return water pipe inside the test cabinet, and the outlet of the second water pump is connected to the coolant return tank.

[0007] Preferably, the valve body module includes a pressure reducing valve, a proportional valve, and a three-way valve. The pressure reducing valve, the proportional valve, and the three-way valve are sequentially installed on the outside of the connecting pipe between the water inlet pipe and the T-shaped pipe. The pressure reducing valve is used to regulate the pressure of the water circuit; the proportional valve is used to control the amount of water flowing into the PTC heater under test; and one or more three-way valves are used to switch between the test water flow and the bypass water flow. The valve body module is integrated inside the test cabinet. The valve body module has an inlet and an outlet at both ends. The end of the inlet pipe is connected to the inlet, and the end of the outlet is connected to a water pipe, which is connected to a T-shaped pipe.

[0008] Preferably, the ends of the inlet and outlet are integrally provided with a fixing plate, and the ends of the water pipe and the inlet pipe are integrally provided with a connecting plate. The bottom of the fixing plate is symmetrically fixed with a fixing block, and the end of the connecting plate is symmetrically provided with a fixing groove. The fixing block is snapped into the fixing groove. The fixing plate is symmetrically provided with an installation cavity, and a sliding plate is slidably connected in the installation cavity. The end of the sliding plate is fixedly connected with a sliding rod, and the end of the sliding rod slides through the fixing plate. The end of the sliding rod located outside the fixing plate is fixedly connected with a pull plate. A spring is sleeved on the outside of the sliding rod. The pull plate is fixedly connected with a fixing rod on one side of the fixing plate. The side wall of the fixing block is provided with a fixing hole, and the end of the fixing rod slides through the connecting plate and is snapped into the fixing hole.

[0009] Preferably, the filter assembly includes a filter pipe, which is detachably connected to the inlet pipe and the connecting pipe. A second annular pipe is rotatably connected to the end of the inlet pipe, and a threaded connector is provided at the end of the second annular pipe. A threaded hole is provided at one end of the filter pipe located in the inlet pipe, and the connector at the end of the second annular pipe is threaded into the threaded hole. A first annular pipe is rotatably connected to the end of the filter pipe, and a connecting protrusion is provided at the end of the first annular pipe. An external thread is provided on the outer side of the connecting protrusion, and an internal thread that mates with the external thread is provided at the port of the connecting pipe. The filter pipe and the connecting pipe are connected by threads. A first filter screen is installed on the inner wall of one end of the filter pipe located in the connecting pipe, and a second filter screen is installed inside one end of the inlet pipe located in the filter pipe.

[0010] Preferably, annular sealing gaskets are provided at the ends of the second annular tube located outside the connector and at the ends of the first annular tube located outside the connecting protrusion, and a sealing ring is provided at the ends of the fixing disc.

[0011] Preferably, a water tank thermometer and a water tank level gauge are respectively installed on the outside of the coolant return tank and the coolant inlet tank. The water tank thermometer is used to monitor the temperature inside the coolant return tank and the coolant inlet tank; the water tank level gauge is used to monitor the liquid level in the coolant return tank and the coolant inlet tank.

[0012] Preferably, anti-slip protrusions are provided at equal intervals on the outer sides of both the first annular tube and the second annular tube.

[0013] Preferably, the mesh diameter of the first filter screen surface is larger than the mesh diameter of the second filter screen surface.

[0014] Preferably, the outer side of the end of the main water inlet pipe is provided with heat insulation cotton.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention integrates thirty independent testing stations, modular valve control, and an automated water circulation system, enabling simultaneous parallel aging tests on large batches of PTC heaters, significantly improving testing efficiency and production cycle time. Each station precisely and independently regulates water pressure and flow rate via pressure reducing valves and proportional valves, and flexibly switches between testing and bypass modes through three-way valves, ensuring that all tested products are under consistent and controllable testing conditions, thereby guaranteeing the accuracy and comparability of test results.

[0016] The valve body module of this invention adopts a quick-release structure design, allowing for rapid separation and connection of pipelines by pulling the pull plate. This enables the maintenance or replacement of a single valve body module without interrupting the entire testing system, and production can be maintained using spare valve body modules, significantly reducing equipment downtime. The filter assembly uses a rotatable and detachable threaded connection, allowing for quick disassembly and cleaning without tools, effectively preventing pipeline blockage and reducing maintenance difficulty and time costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the rear view structure of the present invention; Figure 3 This is a schematic diagram of the water circulation system structure of the present invention; Figure 4 This is a schematic diagram of the valve body module structure of the present invention; Figure 5 This is a schematic diagram of the connection structure of the valve body module of the present invention; Figure 6 This is a schematic diagram of the filter assembly structure of the present invention; Figure 7 This is a schematic diagram of the connection structure of the filter assembly of the present invention; Figure 8 This is a schematic diagram of the outlet connection structure of the valve body module of the present invention; Figure 9 This is a cross-sectional view of the connection between the inlet / outlet of the valve body module of the present invention and the external water pipe. Figure 10 This is a schematic diagram of the main water inlet pipe structure of the present invention; Figure 11 This is a schematic diagram of the water flow structure of the present invention.

[0018] In the diagram: 1. Test cabinet; 2. Control button; 3. Test station; 4. Display instrument; 5. Water circulation system; 6. Main water inlet pipe; 7. Coolant return tank; 8. Coolant inlet tank; 9. First water pump; 10. Second water pump; 11. Water tank thermometer; 12. Water tank level gauge; 13. Inlet pipe; 14. Filter assembly; 15. Connecting pipe; 16. Insulation cotton; 17. Water inlet pipe; 19. Branch pipe; 20. First control valve; 21. Pressure reducing valve. 21. Valve; 22. Proportional valve; 23. Three-way valve; 25. T-tube; 26. Valve body module; 27. Inlet; 28. Outlet; 29. ​​Water pipe; 30. Fixing plate; 31. Connecting plate; 32. Sealing ring; 33. Mounting cavity; 34. Slide plate; 35. Slide rod; 36. Spring; 37. Pull plate; 38. Fixing rod; 39. Fixing block; 40. Filter pipe; 41. First annular pipe; 42. First filter screen; 43. Second filter screen; 44. Second annular pipe. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 , 2 As shown in Figure 11, the present invention provides a technical solution: a multi-station automatic aging test equipment for PTC heaters, including a test cabinet 1, a main control cabinet at one end of the test cabinet 1, thirty independent test stations 3 for performing water heating aging tests on PTC heaters inside the test cabinet 1, and a control button 2 at the top of the test station 3. A water inlet pipe 17 is connected to the outside of the main water inlet pipe 6, and a branch pipe 19 is connected to the outside of the water inlet pipe 17. A valve body module 26 can be detachably installed at the ends of the water inlet pipe 17 and the branch pipe 19. The ends of the two valve body modules 26 are connected to T-shaped pipes 25. The ends of the water inlet pipe 17 and the branch pipe 19, as well as both ends of the T-shaped end of the T-shaped pipe 25, are all equipped with first control valves 20. The test cabinet 1 is equipped with a water circulation system 5 that provides cooling water to all workstations. The outside of the coolant water tank inlet tank 8 is equipped with a water inlet pipe 13, and the end of the water inlet pipe 13 is equipped with a filter assembly 14. The water inlet end of the filter assembly 14 is equipped with a connecting pipe 15 for connecting to an external chiller. The test cabinet 1 is equipped with a display instrument 4 located above the test workstation 3.

[0021] It should be noted that in this embodiment, a central control cabinet is integrated at one end of the test cabinet 1 for centralized control and data processing. The interior of the test cabinet 1 is mainly divided into three functional areas: the upper part is the monitoring and water supply area, the middle part is the test execution area, and the lower part is the water circulation and treatment area. In the middle test execution area, thirty independent test stations 3 are arranged side by side. Each station has an independent electrical interface and water flow pipeline for installing and fixing a PTC heater under test. Each test station 3 has a control button 2 on its top for easy local operation and status indication. Above the test stations 3, a row of display instruments 4 is installed to centrally and in real time display key test parameters such as voltage, current, inlet water temperature, outlet water temperature, water flow rate, and pressure of all stations.

[0022] Please see Figure 3 As shown, the water circulation system 5 includes a coolant return tank 7 and a coolant inlet tank 8. A main water inlet pipe 6 is installed at the top of the test cabinet 1. A first water pump 9 is fixedly installed on the outside of the coolant inlet tank 8, and the outlet of the first water pump 9 is connected to the main water inlet pipe 6. The inlet of the first water pump 9 is connected to the coolant inlet tank 8. A second water pump 10 is installed on the outside of the coolant return tank 7. The inlet of the second water pump 10 is connected to the return pipe inside the test cabinet 1, and the outlet of the second water pump 10 is connected to the coolant return tank 7.

[0023] It should be noted that in this embodiment, the water circulation system 5 is located at the bottom of the test cabinet 1, mainly including the coolant water tank inlet tank 8 and the coolant water tank return tank 7. The low-temperature cooling water provided by the external industrial chiller first enters the filter assembly 14 through the connecting pipe 15. After the cooling water flows out from the connecting pipe 15, it undergoes primary coarse filtration through the first filter screen 42 in the filter water pipe 40 and fine filtration through the second filter screen 43, effectively removing particulate impurities in the water and protecting subsequent precision valves. The filtered clean cooling water is injected into the coolant water tank inlet tank 8 through the inlet pipe 13 for storage. The water tank thermometer 11 and the water tank level gauge 12 are used to monitor the water temperature and water volume in real time, respectively. The first water pump 9 draws water from the coolant water tank inlet tank 8 and pressurizes it into the main water inlet pipe 6 installed at the top of the test cabinet 1. After the PTC heater is powered on, the heated cooling water (return water) is collected through an independent return water pipeline and pumped back to the coolant return water tank 7 by the second water pump 10, thus forming a complete closed cooling cycle.

[0024] Please see Figure 4 and Figure 5As shown, the valve body module 26 includes a pressure reducing valve 21, a proportional valve 22, and a three-way valve 23. The pressure reducing valve 21, the proportional valve 22, and the three-way valve 23 are sequentially installed on the outside of the connecting pipe between the water inlet pipe 17 and the T-shaped pipe 25. The pressure reducing valve 21 is used to regulate the pressure of the water circuit; the proportional valve 22 is used to control the amount of water flowing into the PTC heater under test; there are one or more three-way valves 23, which are used to switch between the test water flow and the bypass water flow. The valve body module 26 is integrated inside the test cabinet 1. The valve body module 26 has an inlet 27 and an outlet 28 at its two ends. The end of the inlet pipe 17 is connected to the inlet 27, and the end of the outlet 28 is connected to the water pipe 29, and the end of the water pipe 29 is connected to the T-shaped pipe 25.

[0025] It should be noted that in this embodiment, the valve body module 26 is the core control unit. It integrates the pressure reducing valve 21, the proportional valve 22, and the three-way valve 23 into a compact module. During operation, cooling water enters the inlet 27 of one of the valve body modules 26 that is in operation from the inlet pipe 17. First, the pressure reducing valve 21 stabilizes the water pressure to the preset test pressure. Then, the proportional valve 22 precisely adjusts and stabilizes the water flow into the PTC heater under test according to the test process requirements. The three-way valve 23 is used to control the water flow direction. It can direct the water flow to the heater for testing, or switch to the bypass circuit for circulating preheating or fault isolation. The precisely regulated water flow flows out from the outlet 28 of the valve body module 26, through the water pipe 29, the T-pipe 25, and the subsequent station-specific pipeline, and finally flows into the PTC heater core of the corresponding station.

[0026] Please see Figure 8 and Figure 9 As shown, a fixed plate 30 is integrally provided at the ends of the inlet 27 and the outlet 28, and a connecting plate 31 is integrally provided at the ends of the water pipe 29 and the inlet pipe 17. A fixed block 39 is symmetrically fixed to the bottom of the fixed plate 30, and a fixed groove is symmetrically opened at the end of the connecting plate 31. The fixed block 39 is snapped into the fixed groove. An installation cavity 33 is symmetrically opened inside the fixed plate 30, and a sliding plate 34 is slidably connected inside the installation cavity 33. A sliding rod 35 is fixed to the end of the sliding plate 34, and the end of the sliding rod 35 slides through the fixed plate 30. A pull plate 37 is fixed to the end of the sliding rod 35 outside the fixed plate 30, and a spring 36 is sleeved on the outside of the sliding rod 35. A fixed rod 38 is fixed to the pull plate 37 on one side of the fixed plate 30. A fixed hole is opened on the side wall of the fixed block 39, and the end of the fixed rod 38 slides through the connecting plate 31 and is snapped into the fixed hole.

[0027] It should be noted that in this embodiment, the inlet 27 and outlet 28 at both ends of the valve body module 26 are provided with fixing plates 30, and the ends of the water pipe 29 and the inlet pipe 17 connected to them are provided with connecting plates 31. When connecting, the fixing block 39 at the bottom of the fixing plate 30 is aligned with the fixing groove of the connecting plate 31 and inserted. Then, the pull plate 37 is released. Under the reset action of the spring 36, the slide rod 35 pushes the slide plate 34, so that the fixing rod 38 automatically passes through the connecting plate 31 and is inserted into the fixing hole on the side wall of the fixing block 39 to complete the locking. At the same time, the sealing ring 32 ensures that there is no leakage at the connection. When disassembling, simply pull the two pull plates 37 outward at the same time to retract the fixing rod 38, and the valve body module 26 can be pulled out.

[0028] Please see Figure 6 and 7 As shown, the filter assembly 14 includes a filter pipe 40, a filter pipe 40 detachably connected to an inlet pipe 13 and a connecting pipe 15, a second annular pipe 44 rotatably connected to the end of the inlet pipe 13, and a threaded connector provided at the end of the second annular pipe 44, a threaded hole opened at one end of the filter pipe 40 located in the inlet pipe 13, the connector at the end of the second annular pipe 44 being threaded into the threaded hole, a first annular pipe 41 rotatably connected to the end of the filter pipe 40, a connecting protrusion provided at the end of the first annular pipe 41, and an external thread provided on the outer side of the connecting protrusion, an internal thread provided in the port of the connecting pipe 15 that mates with the external thread, the filter pipe 40 and the connecting pipe 15 being connected by threads, a first filter screen 42 installed on the inner wall of one end of the filter pipe 40 located in the connecting pipe 15, and a second filter screen 43 installed inside one end of the inlet pipe 13 located in the filter pipe 40.

[0029] It should be noted that, in this embodiment, when the equipment is started, the cooling water provided by the external chiller enters the filter assembly 14 through the connecting pipe 15 for filtration. The water in the connecting pipe 15 first undergoes primary filtration through the first filter screen 42, and then undergoes ultra-fine filtration through the second filter screen 43 to remove impurities and protect subsequent pipelines and valves. The filtered cooling water enters the coolant water tank 8 for storage and is then pressurized by the first water pump 9 and pumped into the main water inlet pipe 6. The cooling water in the main water inlet pipe 6 is precisely regulated through the branch pipes 19 of each test branch and one of the working valve modules 26. The pressure reducing valve 21 first stabilizes the water pressure to the set value, and the proportional valve 22 then precisely controls the water flow into each tested PTC heater. The three-way valve 23 is used to switch between the test state and the bypass circulation state. The precisely regulated and pressure-flow-stable cooling water flows into the PTC heater of the corresponding station through the T-pipe 25 and subsequent pipelines. At the same time, the control system of the station applies the rated working voltage to the heater, so that it enters the heating working state. The cooling water (i.e., return water) that has flowed through and been heated is pumped back to the coolant return water tank 7 through the return water pipeline via the second water pump 10, completing one cycle. Throughout the process, the main control cabinet receives instructions through the control buttons 2 on the top of each workstation and monitors key parameters such as voltage, current, temperature, flow rate, and pressure of all workstations in real time through the display instrument 4. The water tank thermometer 11 and the water tank level gauge 12 continuously monitor the water tank status to ensure the stable operation of the cooling system. When the valve module 26 in operation malfunctions, the first control valves 20 at both ends connected to the valve module 26 in operation can be closed, and the first control valves 20 at both ends of the other valve module 26 can be opened, so that the other valve module 26 can work. When disassembling the faulty valve body module 26, simply pull the two pull plates 37 on the outside of the fixing plate 30 and the connecting plate 31 to disengage the fixing rod 38 from the connecting plate 31, and then pull out the water pipe 29. The connection of the inlet port 27 is the same as the connection of the outlet port 28. When the valve body module 26 needs to be reinstalled, pull the two pull plates 37, and then connect the water pipe 29 to the fixing plate 30 so that the fixing block 39 on the fixing plate 30 is locked in the fixing groove on the connecting plate 31. Then release the pull plates 37, and under the action of the spring 36, the fixing rod 38 extends into the connecting plate 31 and is locked into the fixing hole on the side wall of the fixing block 39, realizing a quick direct insertion connection of the valve body. The setup of two valve body modules 26 allows for the maintenance of the faulty valve body module 26 without stopping the machine. When it is necessary to clean the first filter screen 42 and the second filter screen 43, simply turn off the water supply of the external chiller and close the control valve on the outside of the inlet pipe 13. Then, move the first annular pipe 41 and the second annular pipe 44 to disassemble the filter pipe 40, exposing the first filter screen 42 and the second filter screen 43 to the outside, making it easier to clean the filtered dirt.

[0030] Please see Figure 7 and Figure 9 As shown, annular sealing gaskets are provided at the ends of the second annular tube 44 located outside the connector and at the ends of the first annular tube 41 located outside the connecting protrusion, and a sealing ring 32 is provided at the end of the fixed plate 30.

[0031] It should be noted that, in this embodiment, by providing annular sealing gaskets at the end of the second annular pipe 44 located outside the connector and at the end of the first annular pipe 41 located outside the connecting protrusion, the sealing connection between the connecting pipe 15 and the filter pipe 40, as well as between the filter pipe 40 and the inlet pipe 13, can be ensured, preventing water from overflowing from the connection gap; the sealing ring 32 can ensure the sealing of the connection between the inlet 27 and outlet 28 of the valve body module 26 and the external pipe, preventing water from overflowing from the gap between the two.

[0032] Please see Figure 3 As shown, a water tank thermometer 11 and a water tank level gauge 12 are respectively installed on the outside of the coolant return tank 7 and the coolant inlet tank 8. The water tank thermometer 11 is used to monitor the temperature inside the coolant return tank 7 and the coolant inlet tank 8; the water tank level gauge 12 is used to monitor the liquid level in the coolant return tank 7 and the coolant inlet tank 8.

[0033] It should be noted that in this embodiment, real-time monitoring of the temperature of the coolant inlet tank 8 is crucial to ensuring that the initial temperature of the coolant entering each PTC heater meets the test standards. Combined with an external chiller, a closed-loop control can be formed to precisely maintain a constant inlet water temperature. The water level gauge 12 can continuously monitor the water level of both tanks. If the coolant inlet tank 8 is too low, it indicates that the system water supply is interrupted or there is a serious leak. The system can immediately and automatically cut off the power to all PTC heaters to prevent the PTC heaters from burning out instantly, being damaged, or even causing a fire due to heating without coolant.

[0034] Please see Figure 7 As shown, anti-slip ridges are provided at equal intervals on the outer sides of both the first annular tube 41 and the second annular tube 44.

[0035] It should be noted that, in this embodiment, by providing anti-slip protrusions at equal intervals on the outer sides of the first annular tube 41 and the second annular tube 44, the friction between the hand and the first annular tube 41 and the second annular tube 44 can be increased, thereby enabling smoother manipulation of the first annular tube 41 and the second annular tube 44, and thus better achieving the connection between the pipes.

[0036] Please see Figure 7 As shown, the mesh diameter on the surface of the first filter screen 42 is larger than the mesh diameter on the surface of the second filter screen 43.

[0037] It should be noted that in this embodiment, the first filter screen 42 serves as the first line of defense, intercepting larger particulate impurities in the cooling water, such as rust, scale fragments, and larger suspended solids; the second filter screen 43 is responsible for capturing finer particles. This division of labor in filtration can prevent all impurities from accumulating on the fine filter screen and causing it to clog quickly.

[0038] Please see Figure 10 As shown, insulation cotton 16 is installed on the outside of the end of the main water inlet pipe 6.

[0039] It should be noted that in this embodiment, the main water inlet pipe 6 is arranged horizontally inside the test cabinet 1, and all test stations 3 are located below the main water inlet pipe 6. By adding a section of insulation cotton 16 to the outside of the main water inlet pipe 6 at the last few test stations 3, the water inlet temperature can be guaranteed.

[0040] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0041] Furthermore, the terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as “first,” “second,” “third,” or “fourth” may explicitly or implicitly include at least one of those features.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-station automatic aging test equipment for PTC heaters, characterized in that: The test cabinet (1) is provided with a main control cabinet at one end. The test cabinet (1) is provided with thirty independent test stations (3) for water heating aging tests on PTC heaters. The test station (3) is provided with a control button (2) at the top. The main water inlet pipe (6) is connected to a water inlet pipe (17) on the outside. The water inlet pipe (17) is connected to a branch pipe (19) on the outside. The ends of the water inlet pipe (17) and the branch pipe (19) can be detachably installed with valve body modules (26). The ends of the two valve body modules (26) are connected to T-shaped pipes (25). The ends of the water inlet pipe (17) and the branch pipe (19) and the two ends of the T-shaped end of the T-shaped pipe (25) are all equipped with first control valves (20). The test cabinet (1) is equipped with a water circulation system (5) that provides cooling water for all workstations. The outside of the coolant water tank inlet tank (8) is equipped with an inlet pipe (13), and the end of the inlet pipe (13) is equipped with a filter assembly (14). The inlet end of the filter assembly (14) is equipped with a connecting pipe (15) for connecting to an external chiller. The test cabinet (1) is equipped with a display instrument (4) located above the test workstation (3).

2. The multi-station automatic aging test equipment for PTC heaters according to claim 1, characterized in that: The water circulation system (5) includes a coolant water tank return tank (7) and a coolant water tank inlet tank (8). A main water inlet pipe (6) is installed at the top of the test cabinet (1). A first water pump (9) is fixedly installed on the outside of the coolant water tank inlet tank (8), and the outlet of the first water pump (9) is connected to the main water inlet pipe (6). The inlet of the first water pump (9) is connected to the coolant water tank inlet tank (8). A second water pump (10) is installed on the outside of the coolant water tank return tank (7). The inlet of the second water pump (10) is connected to the return pipe inside the test cabinet (1), and the outlet of the second water pump (10) is connected to the coolant water tank return tank (7).

3. The multi-station automatic aging test equipment for PTC heaters according to claim 1, characterized in that: The valve body module (26) includes a pressure reducing valve (21), a proportional valve (22), and a three-way valve (23). The pressure reducing valve (21), the proportional valve (22), and the three-way valve (23) are installed sequentially on the outside of the connecting pipe between the water inlet pipe (17) and the T-shaped pipe (25). The pressure reducing valve (21) is used to adjust the pressure of the water circuit; the proportional valve (22) is used to control the amount of water flowing into the PTC heater under test; and there are one or more three-way valves (23) used to switch between the test water flow and the bypass water flow. The valve body module (26) is integrated inside the test cabinet (1). The valve body module (26) has an inlet (27) and an outlet (28) at its two ends respectively. The end of the inlet pipe (17) is connected to the inlet (27), and the end of the outlet (28) is connected to a water pipe (29), and the end of the water pipe (29) is connected to a T-shaped pipe (25).

4. The multi-station automatic aging test equipment for PTC heaters according to claim 3, characterized in that: The ends of the inlet (27) and outlet (28) are integrally provided with a fixing plate (30), and the ends of the water pipe (29) and inlet pipe (17) are integrally provided with a connecting plate (31). The bottom of the fixing plate (30) is symmetrically fixed with a fixing block (39). The end of the connecting plate (31) is symmetrically provided with a fixing groove. The fixing block (39) is snapped into the fixing groove. The fixing plate (30) is symmetrically provided with an installation cavity (33), and a sliding plate (34) is slidably connected in the installation cavity (33). The slide (34) is fixedly connected to a slide rod (35) at its end, and the end of the slide rod (35) slides through the fixed plate (30). The end of the slide rod (35) located outside the fixed plate (30) is fixedly connected to a pull plate (37). A spring (36) is sleeved on the outside of the slide rod (35). The pull plate (37) is fixedly connected to a fixing rod (38) on one side of the fixed plate (30). The side wall of the fixing block (39) is provided with a fixing hole. The end of the fixing rod (38) slides through the connecting plate (31) and is engaged in the fixing hole.

5. The multi-station automatic aging test equipment for PTC heaters according to claim 1, characterized in that: The filter assembly (14) includes a water filter pipe (40). The water filter pipe (40) is detachably connected between the water inlet pipe (13) and the connecting pipe (15). A second annular pipe (44) is rotatably connected to the end of the water inlet pipe (13), and a threaded connector is provided at the end of the second annular pipe (44). A threaded hole is opened at one end of the water filter pipe (40) located in the water inlet pipe (13). The connector at the end of the second annular pipe (44) is threaded into the threaded hole. The end of the water filter pipe (40) rotates... A first annular pipe (41) is connected, and a connecting protrusion is provided at the end of the first annular pipe (41), and an external thread is provided on the outside of the connecting protrusion. An internal thread that mates with the external thread is provided in the port of the connecting pipe (15). The filter pipe (40) and the connecting pipe (15) are connected by threads. A first filter screen (42) is installed on the inner wall of one end of the filter pipe (40) and a second filter screen (43) is installed inside the water inlet pipe (13) at one end of the filter pipe (40).

6. The multi-station automatic aging test equipment for PTC heaters according to claim 5, characterized in that: The second annular tube (44) end located outside the connector and the first annular tube (41) end located outside the connecting protrusion are both provided with annular sealing gaskets, and the fixed plate (30) end is provided with a sealing ring (32).

7. The multi-station automatic aging test equipment for PTC heaters according to claim 1, characterized in that: A water tank thermometer (11) and a water tank level gauge (12) are respectively installed on the outside of the coolant return tank (7) and the coolant inlet tank (8). The water tank thermometer (11) is used to monitor the temperature inside the coolant return tank (7) and the coolant inlet tank (8). The water tank level gauge (12) is used to monitor the liquid level in the coolant return tank (7) and the coolant inlet tank (8).

8. The multi-station automatic aging test equipment for PTC heaters according to claim 5, characterized in that: Anti-slip ridges are provided at equal intervals on the outer sides of the first annular tube (41) and the second annular tube (44).

9. The multi-station automatic aging test equipment for PTC heaters according to claim 5, characterized in that: The mesh diameter of the first filter screen (42) is larger than the mesh diameter of the second filter screen (43).

10. The multi-station automatic aging test equipment for PTC heaters according to claim 1, characterized in that: The outer side of the end of the main water inlet pipe (6) is provided with thermal insulation cotton (16).

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