Overtemperature protection durability test equipment for instant electric water heater

Abstract

The invention provides an overtemperature protection durability testing device for an instant electric water heater, and belongs to the technical field of instant electric water heater testing. An overtemperature protection durability test device for an instant electric water heater comprises a rack, a test barrel, a driving mechanism, a transmission mechanism and a reset mechanism. The test barrel is fixedly connected to the rack; the test barrel is used for containing water, so that the instant electric water heater can heat to carry out an overtemperature protection durability test. The driving mechanism is arranged in the testing barrel; the driving mechanism comprises a floating plate arranged in the testing barrel and a connecting piece fixedly connected to the top of the floating plate; the floating plate floats on the water surface and drives the connecting piece to ascend or descend along with the water level change of the testing barrel. The transmission mechanism is arranged on the rack; the transmission mechanism comprises a driving shaft and a rocker which are rotationally connected to the rack; one end of the rocker is slidably connected with the connecting piece, and the other end is fixedly connected with the driving shaft; the connecting piece drives the rocker and the driving shaft to rotate when ascending and descending along with the floating plate.

Description

Technical Field

[0001] The invention belongs to the technical field of instant electric water heater testing, and more specifically, relates to an over-temperature protection durability testing device for instant electric water heaters. Background Art

[0002] The durability test equipment for over-temperature protection of instant electric water heaters is mainly used to simulate the working state of the water heater repeatedly triggering the over-temperature protection mechanism during long-term use, so as to verify the reliability and durability of its protection function. The test equipment needs to accurately control parameters such as water temperature, current and voltage, and repeatedly trigger over-temperature protection under preset conditions, and record key data such as the response time and reset number of the water heater. The test equipment in the prior art usually includes a temperature sensor, a current and voltage regulation module, a data acquisition system and a mechanical reset device. The temperature sensor is used to monitor the water temperature inside the water heater in real time, the current and voltage regulation module simulates different load conditions, the data acquisition system records the changes in various parameters during the test, and the mechanical reset device is used to restore the water heater to its working state after the protection is triggered.

[0003] The testing equipment in the prior art has the following defects: during the test, when the water heater triggers the circuit breaker protection due to overtemperature, the test process will be interrupted. In order for the test to continue, manual intervention is usually required to reset the switch of the water heater. This reliance on manual intervention not only increases the workload of testers, but also makes it impossible to automate the test process, and the test rhythm is frequently interrupted. The delay and operational errors of manual reset further reduce the accuracy and consistency of the test. In addition, due to the long test cycle, the inefficiency of manual operation will significantly extend the overall test time, affecting the product development and market launch progress. This inefficient testing mode is difficult to meet the needs of modern manufacturing for high-precision and high-efficiency testing, and urgently needs to be improved to achieve an automated and continuous testing process. Summary of the Invention

[0004] The purpose of the present invention is to provide an over-temperature protection durability testing device for instant electric water heaters, aiming to solve the problems in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is to provide an instant electric water heater over-temperature protection durability test device, comprising: frame; A test barrel, fixedly connected to the frame; the test barrel is used to hold water so that the instant electric water heater can heat it to perform an over-temperature protection durability test; A driving mechanism is disposed inside the test barrel; the driving mechanism includes a floating plate disposed inside the test barrel and a connector fixedly connected to the top of the floating plate; the floating plate floats on the water surface and drives the connector to rise or fall as the water level of the test barrel changes; A transmission mechanism is provided on the frame; the transmission mechanism includes a drive shaft and a rocker rotatably connected to the frame; one end of the rocker is slidably connected to the connecting member, and the other end is fixedly connected to the drive shaft; the connecting member drives the rocker and the drive shaft to rotate as the floating plate rises and falls; and A reset mechanism is provided on the frame; the reset mechanism includes a drive disk rotatably connected to the frame and at least two levers fixedly connected to the drive disk; the drive disk is in transmission connection with the drive shaft; at least two levers are evenly distributed on the curved surface of the drive disk; when the lever rotates with the drive disk, the switch of the instant electric water heater is driven to reset so that the over-temperature protection durability test can continue.

[0006] In a possible implementation, a first sliding groove is provided on the test barrel, a first sliding block is provided on the floating plate, and the first sliding block is slidably connected in the first sliding groove.

[0007] In a possible implementation, a second sliding groove is provided at one end of the rocker, and a second slider is provided at the top of the connecting member; the second slider is slidably connected in the second sliding groove.

[0008] In a possible implementation, the drive disc is coaxially arranged with the drive shaft, and the drive disc is fixedly connected to the drive shaft.

[0009] In a possible implementation, the drive disc and the drive shaft are not coaxial, and the transmission mechanism further includes: A first transmission plate is coaxially arranged with the drive shaft; the first transmission plate is in driving connection with the drive shaft; and The second transmission disc is coaxially arranged with the driving disc and is fixed on a side surface of the driving disc; the first transmission disc is in driving connection with the second transmission disc.

[0010] In a possible implementation manner, a diameter of the first transmission disc is greater than a diameter of the second transmission disc.

[0011] In a possible implementation manner, the first transmission disc is fixedly connected to the drive shaft.

[0012] In one possible implementation, a ratchet and pawl assembly is provided between the first transmission disc and the drive shaft; when the floating plate rises, the drive shaft drives the first transmission disc to rotate through the ratchet and pawl assembly, and when the floating plate descends, the drive shaft cannot drive the first transmission disc to rotate.

[0013] In a possible implementation, the shift rod is a spring.

[0014] In a possible implementation, the shift rod is an elastic and flexible rod.

[0015] The present invention provides an instant electric water heater over-temperature protection durability test device with the following beneficial effects: Compared to the prior art, during the test process, the instant electric water heater heats the water in the test barrel. When the water temperature in the test barrel reaches the set temperature, the switch of the instant electric water heater automatically turns off. Cold water is then added to the test barrel to lower the water temperature in the test barrel, allowing the instant electric water heater to continue heating. When cold water is added to the test barrel, the water level in the test barrel rises, and the float plate rises along with the water level, thereby driving the rocker arm and drive shaft to rotate through the connecting member. When the drive shaft rotates, it drives the drive disk and the lever to rotate. When the lever rotates, it resets the switch of the instant electric water heater, thereby starting the operation of the instant electric water heater.

[0016] During the durability test, when the instantaneous electric water heater is disconnected, adding cold water to the test tank automatically resets the switch by utilizing the rising water level in the test tank. This eliminates the need for additional operations, improving the smoothness and efficiency of the test. The system automatically resets the instantaneous electric water heater without the need for other automated equipment, resulting in a simple structure. It does not require electrical power, making operation, operation, and maintenance simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure of an instant electric water heater over-temperature protection durability test device provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of a driving mechanism provided in an embodiment of the present invention; Figure 3 A schematic structural diagram of a transmission mechanism provided by an embodiment of the present invention; Figure 4 A schematic structural diagram of another transmission mechanism provided by an embodiment of the present invention; Figure 5 A schematic structural diagram of a reset mechanism provided in an embodiment of the present invention; Figure 6 A schematic structural diagram of a first transmission disc and a drive shaft provided in an embodiment of the present invention; Figure 7 A schematic structural diagram of another first transmission disc and drive shaft provided by an embodiment of the present invention; Figure 8 A schematic structural diagram of a drive disc and a shift lever provided in an embodiment of the present invention.

[0019] 1. Frame; 2. Test barrel; 21. First slide; 3. Drive mechanism; 31. Float; 311. First slider; 32. Connector; 321. Second slider; 4. Transmission mechanism; 41. Drive shaft; 42. Rocker; 421. Second slide; 43. First transmission plate; 44. Second transmission plate; 45. Ratchet and pawl assembly; 5. Reset mechanism; 51. Drive plate; 52. Lever. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Reference Figures 1 to 8 Now, the instant electric water heater over-temperature protection durability testing equipment provided by the present invention is described.

[0022] A device for testing the durability of over-temperature protection of an instant electric water heater comprises a frame 1, a test barrel 2, a driving mechanism 3, a transmission mechanism 4 and a reset mechanism 5.

[0023] Test barrel 2 is fixedly connected to frame 1; test barrel 2 is used to hold water so that the instant electric water heater can heat it for over-temperature protection durability testing. Drive mechanism 3 is disposed within test barrel 2; drive mechanism 3 includes a float 31 disposed within test barrel 2 and a connector 32 fixedly connected to the top of float 31; float 31 floats on the water surface, driving connector 32 up or down as the water level in test barrel 2 changes. Transmission mechanism 4 is disposed on frame 1; transmission mechanism 4 includes a drive shaft 41 rotatably connected to frame 1 and a rocker 42; one end of rocker 42 is slidably connected to connector 32, and the other end is fixedly connected to drive shaft 41; as connector 32 rises and falls with float 31, it drives rocker 42 and drive shaft 41 to rotate. The reset mechanism 5 is disposed on the frame 1; the reset mechanism 5 includes a drive disk 51 rotatably connected to the frame 1 and at least two levers 52 fixedly connected to the drive disk 51; the drive disk 51 is in transmission connection with the drive shaft 41; the at least two levers 52 are evenly distributed on the curved surface of the drive disk 51; when the levers 52 rotate with the drive disk 51, they drive the switch of the instant electric water heater to reset so that the over-temperature protection durability test can continue.

[0024] The instantaneous electric water heater over-temperature protection durability tester provided by the present invention has the following beneficial effects: Compared to the prior art, during the test process, the instantaneous electric water heater heats water in a test barrel 2. When the water temperature in the test barrel 2 reaches the set temperature, the instantaneous electric water heater's switch automatically turns off. Cold water is then added to the test barrel 2 to lower the water temperature, allowing the instantaneous electric water heater to continue heating. When cold water is added to the test barrel 2, the water level in the test barrel 2 rises, and the float plate 31 rises with the water level, thereby driving the rocker arm 42 and drive shaft 41 to rotate via the connector 32. The rotation of the drive shaft 41 drives the drive disc 51 and the shift lever 52 to rotate. The rotation of the shift lever 52 resets the instantaneous electric water heater's switch, thereby resuming operation of the instantaneous electric water heater.

[0025] During the durability test, the buoyancy in the test water bucket drives the float plate 31 upward, thereby inputting power to the drive mechanism 3, causing the drive mechanism 3 to start operating. The drive mechanism 3 drives the reset mechanism 5 through the transmission mechanism 4 to reset the switch of the instant electric water heater. When the switch of the instant electric water heater is disconnected, when cold water is added to the test bucket, the rising water level in the test bucket 2 can be used to automatically reset the switch of the instant electric water heater. No additional operations are required, which can improve the smoothness and efficiency of the test. It does not require the installation of other automated equipment to achieve automatic reset of the switch of the instant electric water heater, and the structure is simple. It does not require electrical drive, and operation, operation and maintenance are also simple.

[0026] In a preferred embodiment, the float 31 is made of polyethylene. This high-density polyethylene injection-molded float 31 offers excellent corrosion and UV resistance, providing long-term protection against seawater, freshwater, and chemical erosion. Its internal honeycomb hollow structure provides a load-bearing capacity exceeding 150 kg while remaining lightweight, and its non-slip surface ensures safe use in wet environments. This material is particularly suitable for applications requiring long-term immersion, such as swimming instructional aids, water park equipment, and dock floating platforms. Its recyclability also makes it an ideal choice for temporary water projects.

[0027] In a preferred embodiment, the float 31 is made of polystyrene foam. Manufactured through an EPS or XPS foaming process, this type of float 31 is extremely lightweight, weighing only one-third of a polyethylene float 31. Its closed-cell structure ensures a water absorption rate of less than 2%, ensuring that even surface damage does not affect overall buoyancy. It also offers excellent thermal insulation properties. While its impact resistance is relatively low, this material is highly suitable for short-term water activities such as rafting equipment and fishing platforms. It is also commonly used as filler in modular pontoons for emergency rescue applications. Some high-end products feature a PVC coating for enhanced durability.

[0028] In a preferred embodiment, the float 31 is constructed from glass fiber reinforced plastic and polyurethane foam. This combination of materials provides both a rigid skeleton and a cushioning core, achieving a compressive strength over five times that of a standard float 31 and enabling customization of specific shapes. While maintenance is challenging, its superior performance makes it a top choice for specialized applications such as oceanographic observation buoys, military training equipment, and competitive swimming starting blocks. In permanent marina buoys requiring long-term load-bearing and wind and wave resistance, it can offer a service life of up to 20 years.

[0029] In a possible implementation, a first sliding groove 21 is provided on the test barrel 2 , a first sliding block 311 is provided on the floating plate 31 , and the first sliding block 311 is slidably connected in the first sliding groove 21 .

[0030] The first chute 21 is vertically positioned, and the float 31 can only be raised and lowered in the vertical direction through the cooperation of the first slider 311 and the first chute 21. The first chute 21 and the first slider 311 restrict the movement of the float 31, forcing it to slide only in the vertical direction. When the water level in the test tub 2 rises, the float 31, under the action of buoyancy, rises vertically along the first chute 21. When the water level in the test tub 2 drops, the float 31, under the action of its own weight, descends vertically along the first chute 21.

[0031] In a preferred embodiment, the first chute 21 can be a vertically tapered chute cut into the inner wall of the test barrel 2 by machining. The first slider 311 is shaped to match the first chute 21 and is mounted within the first chute 21. Specifically, the first chute 21 can be shaped as a T-slot, and the first slider 311 can be shaped as a T-block; the first chute 21 can be shaped as a trapezoidal slot, and the first slider 311 can be shaped as a trapezoidal block; or the first chute 21 can be shaped as a dovetail slot, and the first slider 311 can be shaped as a dovetail block.

[0032] In a preferred embodiment, the first chute 21 can be vertically mounted on a guide rail on the inner wall of the test barrel 2 via bolts, and the guide rail is provided with a chute. The first slider 311 is mounted in the chute. Specifically, the first chute 21 can be in the form of a T-slot, and the first slider 311 can be in the form of a T-block; the first chute 21 can be in the form of a trapezoidal slot, and the first slider 311 can be in the form of a trapezoidal block; the first chute 21 can be in the form of a dovetail slot, and the first slider 311 can be in the form of a dovetail block.

[0033] In a possible implementation, a second sliding groove 421 is provided at one end of the rocker 42 , and a second slider 321 is provided at the top of the connecting member 32 ; the second slider 321 is slidably connected in the second sliding groove 421 .

[0034] The rocker 42 has a keyway at its end near the connector 32. The second slider 321 is a cylindrical slider that matches the keyway. As the float 31 rises with the water level, it pushes the rocker 42 through the connector 32, causing the second slider 321 to slide within the first slot 21. The rotation of the rocker 42 drives the drive shaft 41, providing power to the transmission mechanism 4 and reset mechanism 5. This ultimately drives the lever 52 to rotate, resetting the instantaneous electric water heater.

[0035] In one possible implementation, the drive disc 51 is coaxially disposed with the drive shaft 41 and is fixedly connected to the drive shaft 41. The drive disc 51 is directly fixedly connected to the drive shaft 41. When the drive shaft 41 rotates, the drive disc 51 is directly driven to rotate. Because there is no transmission mechanism 4 between the drive shaft 41 and the drive disc 51, there is no power loss between the drive shaft 41 and the drive disc 51, which facilitates the floating plate 31 driving the drive disc 51 to rotate.

[0036] In a possible implementation, the drive disc 51 is not coaxial with the drive shaft 41, and the transmission mechanism 4 further includes: The first transmission disc 43 is coaxially arranged with the drive shaft 41; the first transmission disc 43 is in transmission connection with the drive shaft 41; and The second transmission disc 44 is coaxially arranged with the driving disc 51 and is fixed on the side of the driving disc 51 ; the first transmission disc 43 is transmission-connected to the second transmission disc 44 .

[0037] In a possible implementation, the diameter of the first transmission disc 43 is greater than the diameter of the second transmission disc 44 .

[0038] In a preferred embodiment, the first transmission disc 43 and the second transmission disc 44 are both gears, and the two transmit power by meshing. The gear transmission mechanism has a precise and stable transmission ratio, which can achieve accurate speed and torque conversion, and is particularly suitable for mechanical equipment that requires precision transmission. Through the combination of gears with different numbers of teeth, it is easy to achieve speed increase, speed reduction or direction change transmission. This flexibility makes it widely used in various mechanical systems. Secondly, the efficiency of gear transmission is relatively high, usually reaching more than 95%, with low energy loss, which is conducive to improving the energy utilization rate of the overall equipment. The compact structural design enables it to transmit high power even in a limited space, and its load-bearing capacity per unit volume is better than many other transmission methods.

[0039] Gear drives also offer exceptional reliability and durability. Gears manufactured from high-quality materials offer a long service life under normal operating conditions and require minimal maintenance. Metal gears are particularly well-suited for demanding conditions such as heavy loads and high speeds, while engineering plastic gears meet specialized requirements such as lightweight and low noise. Furthermore, gear drives offer a wide range of adaptability, providing suitable gear solutions for applications ranging from miniature precision instruments to large industrial equipment. Their high degree of standardization facilitates mass production and replacement, further reducing operational costs. These advantages have made gear drives an indispensable and fundamental form of transmission in mechanical engineering.

[0040] In a preferred embodiment, power is transmitted between the first transmission disc 43 and the second transmission disc 44 through friction. Specifically, the first transmission disc 43 and the second transmission disc 44 are transmission rollers. The friction roller transmission mechanism has several unique advantages. First, it relies on the friction force of the contact surface to transmit power, which can achieve stepless speed adjustment and the transmission ratio can change smoothly and continuously, which is particularly suitable for occasions requiring precise speed regulation. Secondly, the structure is relatively simple and compact, mainly consisting of an active roller, a driven roller and a pressure regulating device. It is easy to install and maintain and has a low manufacturing cost. The vibration and noise generated during the transmission process are small, and the operation smoothness is better than that of gear transmission. It is suitable for equipment that requires a high level of quietness in the working environment.

[0041] This mechanism offers excellent overload protection, preventing slippage when the load suddenly increases, thus preventing damage to critical components. Adjusting the inter-roller pressure or friction material allows for flexible adjustment of the transmission torque range. Using elastic materials such as rubber and polyurethane as the friction surface effectively absorbs shock and vibration. However, friction loss should be considered, requiring regular inspection of contact surface wear and proper lubrication. These features make friction roller drives widely used in industrial applications requiring flexible transmission, such as printing machinery, textile equipment, and packaging production lines.

[0042] In a preferred embodiment, the first and second transmission discs 43 and 44 serve as impellers, with power transmitted between them via a belt. Power is transmitted through the meshing of the belt with the impeller grooves. Its most notable features are smooth transmission and vibration-absorbing capabilities, effectively reducing mechanical vibration and noise, making it particularly suitable for high-speed operation. Compared to pure gear transmission, this structure is more tolerant of shafting installation errors, allowing for a certain degree of axis deflection and parallelism deviation.

[0043] This mechanism features overload protection, preventing belt slippage when the load suddenly increases, thus preventing equipment damage. The transmission ratio can be flexibly adjusted by replacing impellers of different diameters or adjusting the belt tension. Belts made from special materials such as polyurethane are both wear-resistant and stretch-resistant, maintaining stable performance in harsh environments such as damp and dusty conditions. Maintenance costs are low, requiring only regular checks for belt wear and tension. However, it should be noted that transmission efficiency is slightly lower than that of gear transmission, typically between 90-95%. These characteristics make it widely used in industrial equipment requiring smooth transmission, such as fans, pumps, and compressors.

[0044] In one possible implementation, the first transmission disc 43 is fixedly connected to the drive shaft 41. When the water level in the test tub 2 rises, the float 31 drives the rocker 42 to rotate, which in turn drives the drive shaft 41. The drive shaft 41 then drives the first transmission disc 43 and the second transmission disc 44 to rotate. The second transmission disc 44 then drives the lever 52 to rotate, thereby resetting the switch of the instantaneous electric water heater. When the water level in the test tub 2 drops, the float 31, through the aforementioned process, drives the lever 52 to rotate in the opposite direction, turning off the switch of the instantaneous electric water heater.

[0045] In one possible implementation, a ratchet pawl assembly 45 is provided between the first transmission disc 43 and the drive shaft 41; when the floating plate 31 rises, the drive shaft 41 drives the first transmission disc 43 to rotate through the ratchet pawl assembly 45, and when the floating plate 31 descends, the drive shaft 41 cannot drive the first transmission disc 43 to rotate.

[0046] In a possible implementation, the lever 52 is a spring.

[0047] In a possible implementation, the shifting rod 52 is an elastic and flexible rod.

[0048] The spring and the flexible rod both have a certain hardness. When the second transmission plate 44 rotates, if the pressure between the spring and the flexible rod is large, after the switch of the instant electric water heater is reset, the lever 52 is deformed, and then the lever 52 is disengaged from the instant electric water heater.

[0049] The instantaneous electric water heater over-temperature protection durability tester provided by the present invention has the following beneficial effects: Compared to the prior art, during the test process, the instantaneous electric water heater heats water in a test barrel 2. When the water temperature in the test barrel 2 reaches the set temperature, the instantaneous electric water heater's switch automatically turns off. Cold water is then added to the test barrel 2 to lower the water temperature, allowing the instantaneous electric water heater to continue heating. When cold water is added to the test barrel 2, the water level in the test barrel 2 rises, and the float plate 31 rises with the water level, thereby driving the rocker arm 42 and drive shaft 41 to rotate via the connector 32. The rotation of the drive shaft 41 drives the drive disc 51 and the shift lever 52 to rotate. The rotation of the shift lever 52 resets the instantaneous electric water heater's switch, thereby resuming operation of the instantaneous electric water heater.

[0050] During the durability test, when the instantaneous electric water heater is turned off, the rising water level in the test barrel 2 automatically resets the instantaneous electric water heater when cold water is added to the test barrel 2. This eliminates the need for additional operations, improving the smoothness and efficiency of the test. The automatic reset of the instantaneous electric water heater can be achieved without the need for other automated equipment, resulting in a simple structure. Without the need for electrical power, operation, and maintenance are also simple.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An instant electric water heater over-temperature protection durability test equipment, characterized in that: include: Rack (1); A test barrel (2) is fixedly connected to the frame (1); the test barrel (2) is used to hold water so that the instant electric water heater can heat it to perform an over-temperature protection durability test; A driving mechanism (3) is arranged inside the test barrel (2); the driving mechanism (3) comprises a floating plate (31) arranged inside the test barrel (2) and a connecting member (32) fixedly connected to the top of the floating plate (31); the floating plate (31) floats on the water surface and drives the connecting member (32) to rise or fall as the water level of the test barrel (2) changes; A transmission mechanism (4) is provided on the frame (1); the transmission mechanism (4) comprises a drive shaft (41) and a rocker (42) rotatably connected to the frame (1); one end of the rocker (42) is slidably connected to the connecting member (32), and the other end is fixedly connected to the drive shaft (41); the connecting member (32) drives the rocker (42) and the drive shaft (41) to rotate as the floating plate (31) rises and falls; and A reset mechanism (5) is provided on the frame (1); the reset mechanism (5) comprises a driving disc (51) rotatably connected to the frame (1) and at least two shifting rods (52) fixedly connected to the driving disc (51); the driving disc (51) is transmission-connected to the driving shaft (41); at least two shifting rods (52) are evenly distributed on the curved surface of the driving disc (51); the shifting rods (52) drive the switch of the instant electric water heater to reset when rotating with the driving disc (51), so that the over-temperature protection durability test can continue.

2. The instant electric water heater over-temperature protection durability testing device according to claim 1, characterized in that: A first sliding groove (21) is provided on the test barrel (2), a first sliding block (311) is provided on the floating plate (31), and the first sliding block (311) is slidably connected in the first sliding groove (21).

3. The instant electric water heater over-temperature protection durability testing device according to claim 2, characterized in that: One end of the rocker (42) is provided with a second sliding groove (421), and the top of the connecting member (32) is provided with a second sliding block (321); the second sliding block (321) is slidably connected in the second sliding groove (421).

4. The instant electric water heater over-temperature protection durability testing device according to claim 1, characterized in that: The driving disc (51) is coaxially arranged with the driving shaft (41), and the driving disc (51) is fixedly connected to the driving shaft (41).

5. The instant electric water heater over-temperature protection durability testing device according to claim 1, characterized in that: The driving disc (51) and the driving shaft (41) are not coaxial, and the transmission mechanism (4) further comprises: A first transmission disc (43) is coaxially arranged with the drive shaft (41); the first transmission disc (43) is in transmission connection with the drive shaft (41); and The second transmission disc (44) is coaxially arranged with the driving disc (51), and the second transmission disc (44) is fixed on the side of the driving disc (51); the first transmission disc (43) is transmission-connected with the second transmission disc (44).

6. The instant electric water heater over-temperature protection durability testing device according to claim 5, characterized in that: The diameter of the first transmission disc (43) is greater than the diameter of the second transmission disc (44).

7. The instant electric water heater over-temperature protection durability testing device according to claim 5, characterized in that: The first transmission disc (43) is fixedly connected to the drive shaft (41).

8. The instant electric water heater over-temperature protection durability testing device according to claim 5, characterized in that: A ratchet pawl assembly (45) is provided between the first transmission disc (43) and the drive shaft (41); when the floating plate (31) rises, the drive shaft (41) drives the first transmission disc (43) to rotate via the ratchet pawl assembly (45); and when the floating plate (31) descends, the drive shaft (41) cannot drive the first transmission disc (43) to rotate.

9. The instant electric water heater over-temperature protection durability testing device according to claim 1, characterized in that: The shifting rod (52) is a spring.

10. The instant electric water heater over-temperature protection durability testing device according to claim 1, characterized in that: The shifting rod (52) is a flexible rod with elasticity.

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