Water quantity control device for induction cooker test

Abstract

This invention relates to the field of induction cooker testing technology and discloses a water volume control device for induction cooker testing. The device includes a water storage tank and an induction cooker placed on the induction cooker for heating. The induction cooker and the water storage tank are connected via a circulating water pipe. Water supply pipes are connected to both ends of the water storage tank, and each end of the water supply pipe is connected to a water pump. The water supply pipes include cold water pipes and hot water pipes. The cold water pipe is located at the bottom of the water storage tank to inject water into the tank, and the hot water pipe is located at the top of the water storage tank to recover hot water from the top. Pressure sensors are installed at both the bottom and top of the water storage tank. A circulation module is also installed inside the water storage tank to control the water circulation between the water storage tank and the induction cooker. This application establishes a water supply circulation between the water storage tank and the induction cooker, significantly reducing the labor costs in the testing process. By changing the internal pressure of the water storage tank, bidirectional water flow between the water storage tank and the induction cooker is achieved, effectively reducing the water temperature inside the induction cooker.

Description

Technical Field

[0001] This invention relates to the field of induction cooker testing technology, specifically to a water volume control device for testing induction cookers. Background Technology

[0002] Anti-aging testing of induction cookers is a quality verification step before mass production. By simulating long-term household use, it verifies the performance stability and anti-aging capabilities of the induction cooker under repeated heating and continuous operation conditions. This helps to avoid potential quality problems such as heating failure and frequent malfunctions after large-scale market release. Current mainstream testing methods achieve verification through long-term continuous heating simulation. During the test, a compatible induction cooker is placed on the heating panel of the induction cooker, filled with water to approximately 70% of its rated capacity, and the induction cooker is started and set to its rated heating power for a long period of continuous operation. Because heating causes continuous evaporation, personnel must check the water level every 1-2 hours and replenish water to the initial mark as needed. This is to prevent both water shortage triggering the dry-burn protection and overfilling or boiling over.

[0003] However, current testing methods are costly in practice due to the long time required for anti-aging tests, necessitating frequent checks and water replenishment every 1-2 hours. Therefore, Chinese patent CN204740309U proposes a water circulation system for induction cooker testing. This system includes a DDC control cabinet, a water pump power cabinet, a water supply pipe, a water storage tank, a testing station, a variable frequency pressure pump, a tap water interface, an inlet pipe, and a return pipe. The water storage tank has high-level and low-level sensors installed at its upper and lower parts, respectively. The upper side wall of the tank has an inlet and an outlet. A float level switch is installed at the inlet. The outlet is connected to the inlet pipe via the variable frequency pressure pump. The inlet is positioned higher than the high-level sensor. The water supply pipe is connected to both the inlet and the tap water interface, and includes a gate valve and a switch-type electric valve. The testing station includes at least two... An induction cooker to be tested is used, with an induction pot placed on it. The induction pot has a water inlet and a drain outlet. The drain outlet of the induction pot in each testing station is connected to the water inlet of the next induction pot. The water inlet of the first induction pot in each testing station is connected to the water inlet pipe through a water inlet branch pipe, and the drain outlet of the last induction pot in each testing station is connected to the return pipe through a return branch pipe. The return pipe is connected to the water storage tank. This application uses a liquid level sensor, a float liquid level switch, and a DDC control cabinet to achieve quantitative water supply from the water storage tank to the induction pot, and returns excess water to the water storage tank through the return pipe. This reduces manual water adding to a certain extent. However, because the water in the induction pot is continuously heated by the induction cooker, it is very easy to scald the operator when the water temperature approaches boiling, and there is also a safety hazard of water overflow. At the same time, prolonged boiling of the water in the pot will trigger the temperature protection mechanism of the induction cooker, which cannot meet the requirements of aging test. Summary of the Invention

[0004] (I) Technical problem to be solved: In view of the shortcomings of the existing technology, the present invention provides a water volume control device for testing induction cookers, which has the advantage of improving the water circulation speed between the water storage tank and the induction cooker, and solves the problem of water overflowing due to continuous boiling in the induction cooker.

[0005] (II) Technical Solution: To achieve the above-mentioned goal of increasing the water circulation speed between the water storage tank and the induction cooker, the present invention provides the following technical solution: A water volume control device for testing an induction cooker, comprising a water storage tank filled with water and an induction cooker placed on the induction cooker for heating, wherein the induction cooker and the water storage tank are connected by a circulating water pipe, both ends of the water storage tank are connected to water supply pipes, and both ends of the water supply pipes are connected to water pumps, wherein the water supply pipes include cold water pipes and hot water pipes, wherein the cold water pipes are located at the bottom of the water storage tank to inject water into the water storage tank, and the hot water pipes are located at the top of the water storage tank to recover the hot water at the top of the water storage tank, wherein pressure sensors are provided at the bottom and top of the water storage tank, and a circulation module is also provided inside the water storage tank to control the water circulation between the water storage tank and the induction cooker, wherein the circulation module mixes the water in the water storage tank and the water inside the induction cooker by changing the internal pressure of the water storage tank; a top cover is fixedly installed on the top of the water storage tank, and the circulation module is fixedly installed on the top cover.

[0006] Preferably, the circulation module includes a fixed base, a circulation pressure plate, and a sliding shell. The fixed base is fixedly installed on the top of the water storage tank, and a sliding groove with a width smaller than the width of the water storage tank is formed in the fixed base. The sliding shell, which changes the internal pressure of the water storage tank, is slidably installed in the sliding groove. The circulation pressure plate is slidably assembled in the sliding shell. A telescopic rod is provided between the circulation pressure plate and the fixed base. A flow guide structure is provided at the bottom of the sliding shell to promote the circulation of water inside the water storage tank. When the telescopic rod drives the circulation pressure plate to press down, the circulation pressure plate pushes the sliding shell down vertically into the water storage tank, causing the water pressure inside the water storage tank to rise and exceed the water pressure inside the induction cooker. The water in the water storage tank is driven by the pressure difference to flow into the induction cooker through the circulation water pipe. At the same time, the flow guide structure comes into contact with the water in the water storage tank during the downward pressing process of the sliding shell and changes the direction of water flow around the flow guide structure to promote the mixing of hot and cold water in the water storage tank.

[0007] Preferably, the flow guiding structure consists of two or more sets of inclined flow channels. The two or more sets of flow guiding structures are arranged on both sides of the bottom end of the sliding shell, and the bottom end of the sliding shell is machined with an inclined surface. The inclination direction and angle of the flow guiding structures on both sides are the same as the inclination direction and angle of the inclined surface. Two or more sets of flow guiding grooves are opened on the flow guiding structure along its length direction. The flow guiding grooves penetrate the flow guiding structure in the vertical direction, and the flow guiding diameter of the flow guiding grooves gradually decreases in the vertical upward direction. When the flow guiding structure is pressed down with the sliding shell, the water inside the water storage tank is squeezed by the sliding shell and flows upward along both sides, and the upward flowing water passes through the flow guiding grooves.

[0008] Preferably, the flow guiding structures on both sides are attached to the inner wall of the water storage tank.

[0009] Preferably, the flow guiding structure is a water storage hole, which penetrates the sliding shell and connects the sliding shell to the water storage tank. Two or more flow guiding structures are provided along the length of the sliding shell. The water level inside the water storage tank is higher than the flow guiding structure. The circulating pressure plate is slidably sealed to the sliding shell. When the sliding shell is not pressed down, the telescopic rod drives the circulating pressure plate to move upward along the sliding shell, forming a negative pressure cavity between the circulating pressure plate and the sliding shell. Under negative pressure, the water in the water storage tank is drawn into the negative pressure cavity by the flow guiding structure. When the telescopic rod drives the circulating pressure plate to move downward along the sliding shell, the circulating pressure plate pushes the sliding shell downward along the sliding groove into the water storage tank while simultaneously applying pressure to the water in the negative pressure cavity, causing the water in the negative pressure cavity to be discharged into the water storage tank through the flow guiding structure.

[0010] Preferably, a reset rod is provided between the top of the sliding shell and the fixed base, and the elastic force generated by the reset rod pulls the sliding shell into the sliding groove.

[0011] Preferably, there are two or more sets of telescopic rods, one end of the telescopic rod is fixedly connected to the fixed base, and the other end of the telescopic rod is fixedly connected to the circulating pressure plate. The telescopic rod is a hydraulic rod.

[0012] Preferably, a valve is installed on the circulating water pipe, and a liquid level sensor is fixedly installed inside the water storage tank.

[0013] Preferably, the induction cooker is provided in two or more sets, and the induction cooker is provided with two or more induction pots. A connecting pipe is provided between the two or more induction pots, and the water storage tank is provided with two or more circulating water pipes, and each circulating water pipe is connected to one of the induction pots on each set of the induction cooker.

[0014] (III) Beneficial Effects: Compared with the prior art, the present invention provides a water volume control device for induction cooker testing, which has the following beneficial effects: 1. The water volume control device for induction cooker testing, through the combined use of the water storage tank structure and the circulation module structure, forms a water supply circulation between the water storage tank and the induction cooker, replacing the manual water addition operation method in the traditional induction cooker anti-aging test, greatly reducing the labor cost input in the testing process. At the same time, by changing the internal pressure of the water storage tank, the water between the water storage tank and the induction cooker is made to flow bidirectionally, allowing the cold water in the water storage tank and the hot water in the induction cooker to fully convect and mix, effectively reducing the water temperature in the induction cooker, and avoiding the overflow phenomenon caused by the continuous boiling of the water in the induction cooker. This solves the problem of equipment damage and personnel burn risk caused by water boiling and overflow in the traditional test, and allows the induction cooker to always be in a stable heating condition to complete the anti-aging test, ensuring that the test data can truly reflect the actual anti-aging performance of the induction cooker, and avoiding the problem of test condition distortion caused by the frequent triggering of the protection mechanism of the induction cooker.

[0015] 2. This water volume control device for testing induction cookers, through the combined use of a sliding shell structure and a guide channel structure, constrains the water flow in the water tank during the downward pressing of the sliding shell and generates a Venturi effect to enhance the flow power of the cold water at the bottom. This causes the cold water at the bottom of the water tank to flow upward along the inner wall of the water tank and pre-mix with the hot water at the upper wall. Compared with the traditional natural mixing method, this accelerates the mixing efficiency of the hot and cold water in the water tank, effectively reduces the temperature difference between the water input from the water tank into the induction cooker and the water in the induction cooker, thereby avoiding the problem of thermal stress damage to the induction cooker caused by excessive temperature difference due to alternating hot and cold temperatures. It also prevents violent water disturbance and boiling splashing caused when cold water is injected into the induction cooker, reducing the risk of damage to the electrical components of the induction cooker by high-temperature water.

[0016] 3. This water volume control device for induction cooker testing, through the combined use of a water storage hole structure and a sliding shell structure, first draws hot water from the top of the water tank into the cavity and then discharges it into the cold water area for pre-mixing. Subsequently, the spring force of the reset rod squeezes the cavity to discharge the cold water, which is then further mixed with the water flowing back into the induction cooker. Compared with a single pressure-based water-saving circulation method, this device further improves the mixing efficiency of hot and cold water between the water tank and the induction cooker, allowing for more thorough mixing of the hot and cold water in the water tank. This enables a faster reduction in the water temperature inside the induction cooker, continuously maintaining the water temperature below the boiling threshold, thus solving the problem of water boiling over in the induction cooker. At the same time, it makes the water circulation and heat exchange process between the water tank and the induction cooker more continuous, ensuring that the induction cooker anti-aging test can be carried out continuously in a stable water temperature environment. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the water volume control device used for testing induction cookers in this invention.

[0018] Figure 2 This is a front view of the water volume control device used for testing induction cookers in this invention.

[0019] Figure 3 This is a top view of the water volume control device used for testing induction cookers in this invention.

[0020] Figure 4 This is a cross-sectional view of the water volume control device used for testing induction cookers in this invention.

[0021] Figure 5 This is a schematic diagram of the circulation module structure of the water volume control device used for testing induction cookers in this invention.

[0022] Figure 6 This is a schematic diagram of the flow guiding structure in Example 1.

[0023] Figure 7 This is an exploded view of the water volume control device used for testing induction cookers in this invention.

[0024] Figure 8 This is a schematic diagram of the flow guiding structure in Example 2.

[0025] In the diagram: 1. Water storage tank; 11. Cold water pipe; 12. Hot water pipe; 2. Circulating water pipe; 21. Valve; 3. Circulation module; 31. Fixed base; 311. Sliding groove; 32. Circulation pressure plate; 33. Sliding shell; 34. Telescopic rod; 35. Flow guiding structure; 351. Flow guiding groove; 36. Reset rod; 4. Top cover; 5. Induction cooker; 6. Connecting pipe; 7. Pressure sensor; 8. Liquid level sensor. Detailed Implementation

[0026] 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.

[0027] Example 1: Please refer to Figures 1-7A water volume control device for testing induction cookers includes a water storage tank 1 filled with water and an induction cooker 5 placed on the induction cooker for heating. The induction cooker 5 and the water storage tank 1 are connected by a circulating water pipe 2. The circulating water pipe 2 between the induction cooker 5 and the water storage tank 1 is made of flexible silicone material, which has the characteristics of high and low temperature resistance and corrosion resistance, and can adapt to the temperature changes of the water during the test. Water supply pipes are connected to both ends of the water storage tank 1, and water pumps are connected to both ends of the water supply pipes. The water pumps are miniature centrifugal water pumps, which are fixedly connected to the pipe sections of the water supply pipes through flanges. The water storage tank 1 is connected to water supply pipes at both ends and equipped with independent water pumps. The two independent water pumps can provide power for cold water injection and hot water recovery, respectively. The water supply pipe includes a cold water pipe 11 and a hot water pipe 12. The cold water pipe 11 is located at the bottom of the water storage tank 1 to inject water into the tank. The hot water pipe 12 is located at the top of the water storage tank 1 to recover the hot water at the top. The inlet end of the cold water pipe 11 extends to the inner side of the bottom of the water storage tank 1; the suction end of the hot water pipe 12 is located on the inner side of the top of the water storage tank 1. Since the density of hot water is less than that of cold water, a stratification phenomenon of hot water at the top and cold water at the bottom will naturally form in the water storage tank 1. Injecting cold water from the bottom can use the gravity of the cold water to push the water in the water storage tank 1 upward, accelerating the initial mixing of hot and cold water. Recovering hot water from the top can directly extract the hottest water in the water storage tank 1. Through the combination of cold water injection and hot water recovery, the high-temperature water in the water storage tank 1 is quickly replaced, thereby achieving the purpose of reducing the overall water temperature of the water storage tank 1. Pressure sensors 7 are installed at both the bottom and top of the water storage tank 1. The pressure sensors 7 are installed using a threaded connection, with their sensing ends directly contacting the water in the tank. A sealing gasket is installed at the connection point to prevent water leakage. The pressure sensors 7 are diffused silicon type, with waterproof and corrosion-resistant sensing ends, allowing them to operate while submerged in water for extended periods. The water pressure in the storage tank 1 changes with the water level and the pressure regulation of the circulation module 3. The bottom pressure sensor 7 monitors the baseline water pressure in the tank, while the top pressure sensor 7 reflects changes in gas pressure. Combining the monitoring data from both sensors allows for accurate determination of the water level and pressure status within the storage tank 1. The water storage tank 1 is also equipped with a circulation module 3 that controls the water circulation between the water storage tank 1 and the induction cooker 5. The circulation module 3 mixes the water in the water storage tank 1 and the induction cooker 5 by changing the internal pressure of the water storage tank 1. A top cover 4 is fixedly installed on the top of the water storage tank 1, and the circulation module 3 is fixedly installed on the top cover 4. The top edge of the water storage tank 1 is machined with a flange, and the bottom of the top cover 4 is also provided with a matching flange. A rubber sealing gasket is nested between the two, and the top cover 4 and the flange of the water storage tank 1 are tightly locked together by bolts evenly distributed around the circumference, so as to achieve a seal on the top of the water storage tank 1.

[0028] Please see Figures 1-7The circulation module 3 includes a fixed base 31, a circulation pressure plate 32, and a sliding shell 33. The fixed base 31 is fixedly installed on the top of the water storage tank 1, and a sliding groove 311 with a width smaller than that of the water storage tank 1 is opened inside the fixed base 31. The sliding shell 33, which changes the internal pressure of the water storage tank 1, is slidably installed in the sliding groove 311. The sliding shell 33 is integrally injection molded from water-resistant and temperature-resistant engineering plastic, and its shape is adapted to the rectangular structure of the sliding groove 311. The outer wall of the sliding shell 33 and the inner wall of the sliding groove 311 are fitted with a clearance. The clearance is controlled within a small range to ensure that the sliding shell 33 can slide smoothly and reduce water leakage from the gap. The circulation pressure plate 32 is slidably assembled inside the sliding shell 33. The circulation pressure plate 32 is made of metal, and its edges are nested with wear-resistant rubber sealing rings. The sealing rings are tightly fitted with the inner wall of the sliding shell 33 to form a sliding sealing structure to prevent water leakage between the circulation pressure plate 32 and the sliding shell 33. A telescopic rod 34 is provided between the circulating pressure plate 32 and the fixed base 31. A flow guide structure 35 is provided at the bottom of the sliding shell 33 to promote water circulation inside the water storage tank 1. The flow guide structure 35 and the sliding shell 33 are made of the same material using an integral injection molding process. When the telescopic rod 34 drives the circulating pressure plate 32 to press down, the circulating pressure plate 32 pushes the sliding shell 33 vertically downwards into the water storage tank 1, causing the water pressure inside the water storage tank 1 to rise and exceed the water pressure inside the induction cooker 5. Driven by the pressure difference, the water in the water storage tank 1 flows through the circulating water pipe 2 into the induction cooker 5. Simultaneously, the flow guide structure 35 comes into contact with the water in the water storage tank 1 during the downward pressing process of the sliding shell 33, changing the direction of water flow around the flow guide structure 35 and promoting the mixing of hot and cold water in the water storage tank 1. Figure 4 As shown.

[0029] Please see Figures 1-7In the implementation phase of the induction cooker anti-aging test, the induction cooker 5 was first placed on the heating panel of the induction cooker to be tested. Then, clean water was injected into the water storage tank 1 through the cold water pipe 11. The water in the water storage tank 1 flowed naturally into the induction cooker 5 through the connection of the circulating water pipe 2. When the water level in the induction cooker 5 reached the preset height threshold for the test, the injection of water into the water storage tank 1 was stopped, and the induction cooker was started to enter the aging test process of continuous heating according to the test requirements. During the aging test, the water in the induction cooker 5 was heated by the induction cooker and its temperature rose. The heated water circulated and exchanged heat with the water in the water storage tank 1 through the circulating water pipe 2. Since the density of hot water is less than that of cold water, and the water circulation rate of the circulating water pipe 2 itself is relatively slow, the cold water and hot water in the water storage tank 1 will form a significant stratification phenomenon. The water temperature in the top area of ​​the water storage tank 1 is significantly higher than that in the bottom area. When it is necessary to lower the overall temperature of the water in the water storage tank 1 and the induction cooker 5, hot water is extracted from the top of the water storage tank 1 through the hot water pipe 12, and cold water is simultaneously added to the water storage tank 1 through the cold water pipe 11. By using this hot and cold water exchange method, the water in the water storage tank 1 is rapidly circulated, thereby achieving the purpose of lowering the water temperature in the water storage tank 1 and the induction cooker 5. During the time when the hot water pipe 12 and the cold water pipe 11 stop circulating, the telescopic rod 34 drives the circulation pressure plate 32 to push the sliding shell 33 down into the water storage tank 1. This causes the sliding shell 33 to occupy part of the space inside the water storage tank 1 that was originally filled with water, thus compressing the water volume inside the water storage tank 1. Since the water storage tank 1 is in a relatively closed state and is only connected to the induction cooker 5 through the circulation water pipe 2, the volume compression will exert a squeezing effect on the water inside, resulting in a significant increase in the water pressure inside the water storage tank 1. At this time, the water in the induction cooker 5 is not subjected to additional compression, and its water pressure remains at a normal level. This creates a stable water pressure difference between the water storage tank 1 and the induction cooker 5. The water pressure in the water storage tank 1 is higher than that in the induction cooker 5. According to the physical principle that fluids naturally flow from high-pressure areas to low-pressure areas, the water in the water storage tank 1 will continue to flow along the connecting channel of the circulation water pipe 2 under the drive of this water pressure difference, and eventually enter the induction cooker 5 to mix with the water inside the induction cooker 5.When the sliding shell 33 is fully depressed, the telescopic rod 34 drives the circulating pressure plate 32 in the opposite direction, causing the sliding shell 33 to move upward. During this process, the sliding shell 33 will detach from the water in the water tank 1 and lift upward, releasing the space originally occupied by the sliding shell 33 inside the water tank 1. This results in an increase in the volume of the water tank 1. Since the water tank 1 is in a relatively closed state and is only connected to the induction cooker 5 through the circulating water pipe 2, the increased volume reduces the water pressure inside the water tank 1, creating a relatively negative pressure environment. At this time, the water in the induction cooker 5 is not affected by the change in volume, and its internal pressure remains at a normal level. This creates a new water pressure difference between the induction cooker 5 and the water tank 1. At this time, the water pressure in the induction cooker 5 is higher than the water pressure in the water tank 1. Based on the physical property that fluids always flow from high-pressure areas to low-pressure areas, the water in the induction cooker 5 will flow in the opposite direction along the connection path of the circulating water pipe 2 under the drive of this water pressure difference, and eventually return to the water tank 1. Each complete cycle of water circulation between the water tank 1 and the induction cooker 5, driven by the telescopic rod 34 to push down and move the circulating pressure plate 32, ensures that the hot water in the induction cooker 5 and the cold water in the water tank 1 are fully mixed. This achieves bidirectional flow and two mixing processes between the cold water in the water tank 1 and the hot water in the induction cooker 5. Continuous circulation allows the hot and cold water in the water tank 1 and the induction cooker 5 to form a thorough convective mixture, continuously reducing the overall temperature of the water in the induction cooker 5 and keeping the water temperature below the boiling threshold. This effectively prevents the water in the induction cooker 5 from overflowing due to boiling.

[0030] Please see Figures 4-7 The flow guiding structure 35 consists of two or more sets of inclined flow channels. These two or more sets of flow guiding structures 35 are located on both sides of the bottom end of the sliding shell 33, and the bottom end of the sliding shell 33 is machined with an inclined surface. The inclination direction and angle of the flow guiding structures 35 on both sides are the same as the inclination direction and angle of the inclined surface. The inclined flow channels adopt an arc-shaped transition groove structure. Two or more sets of flow guiding grooves 351 are formed along the length of the flow guiding structure 35. The flow guiding grooves 351 penetrate the flow guiding structure 35 vertically, and the diameter of the flow guiding grooves 351 gradually decreases along the vertical upward direction. Simultaneously, the cross-section of the flow guiding grooves 351 is trapezoidal, with a larger bottom diameter and a smaller top diameter. The walls of the flow guiding grooves 351 adopt a smooth transition design. When the flow guiding structure 35 is pressed down by the sliding shell 33, the water inside the water storage tank 1 is squeezed by the sliding shell 33 and flows upward along both sides, allowing the upward-flowing water to pass through the flow guiding grooves 351. The flow guiding structures 35 on both sides are attached to the inner wall of the water storage tank 1.

[0031] Please see Figures 1-7The telescopic rod 34 is provided in two or more sets. One end of the telescopic rod 34 is fixedly connected to the fixed base 31, and the other end of the telescopic rod 34 is fixedly connected to the circulating pressure plate 32. The telescopic rod 34 is a hydraulic rod. The telescopic rod 34 is a double-acting hydraulic rod, and both ends of it are provided with connecting joints with pin holes. The bottom of the fixed base 31 is correspondingly machined with mounting ear plates with pin holes. The connecting joint at one end of the hydraulic rod is hinged to the mounting ear plate by a pin. The top of the circulating pressure plate 32 is also machined with matching mounting ear plates. The connecting joint at the other end of the hydraulic rod is connected to the ear plate of the circulating pressure plate 32 by the same pin hinge method. Wear-resistant grease is applied to the mating part of the pin and the pin hole to reduce friction loss during relative movement. A valve 21 is installed on the circulating water pipe 2, and a liquid level sensor 8 is fixedly installed in the water storage tank 1. The level sensor 8 has a probe that extends vertically into the water tank 1. The probe is coated with an anti-corrosion layer, and the bottom sensor is positioned away from the bottom of the tank to avoid interference from impurities. The level sensor 8 monitors the water level in the tank 1 in real time. As the water continuously evaporates during the test, the water level gradually decreases. The level sensor 8 transmits the water level signal to the controller. When the water level falls below a preset threshold, the water pump on the cold water pipe 11 automatically starts replenishing water. When the water level reaches the preset upper limit, replenishment automatically stops, avoiding frequent manual checks and reducing labor costs. The induction cooker has two or more units, each with two or more induction pots 5. A connecting pipe 6 connects the two or more induction pots 5. The water tank 1 has two or more circulating water pipes 2, each connected to one of the induction pots 5 on each induction cooker unit. The connecting pipe 6 is made of food-grade 304 stainless steel. Both ends are sealed to the connecting interface of the adjacent induction cooker 5 through quick-release clamps. The inner side of the clamp is nested with a silicone sealing ring to prevent water leakage. The height of the connecting pipe 6 is level with the safe water level of the induction cooker 5, ensuring that when the water level of one of the induction cookers 5 in the group rises, water can flow through the connecting pipe 6 to the induction cooker 5 with a lower water level, maintaining a consistent water level in the induction cookers 5 in the same group.

[0032] Please see Figures 4-7The flow guiding structure 35 can cause the water in the water storage tank 1 to flow in a shaped manner during the downward pressing of the sliding shell 33, so that the cold water located below the water storage tank 1 can flow upward along the flow guiding channel 351, thereby enabling the cold water at the bottom to quickly mix with the hot water at the top, realizing the pre-mixing of cold and hot water in the water storage tank 1. This reduces the problem of large temperature difference between the water input from the water storage tank 1 to the induction cooker 5 and the water in the induction cooker 5, which can cause thermal stress damage to the induction cooker 5 due to thermal expansion and contraction, violent water disturbance, or even boiling and splashing, resulting in equipment damage or burns to personnel. When the sliding shell 33 is pressed down, it exerts a downward squeezing force on the water in the water storage tank 1. Originally, this squeezing force would cause the water to spread randomly in all directions. However, the inclined flow channel of the guide structure 35 constrains the water flow, forcing the water to flow in a directional and fixed manner according to the inclined direction of the flow channel. At the same time, the guide groove 351 on the guide structure 35 runs vertically through the water and the vertically upward guide diameter gradually decreases. According to the Venturi effect in fluid mechanics, the cold water below the water storage tank 1 is squeezed by the sliding shell 33. After entering the guide channel 351 under the action of the water flow, the water flow velocity will increase due to the narrowing of the opening, thereby gaining upward momentum and continuing to flow upward along the guide channel 351. The design of the guide structure 35 attached to the inner wall of the water storage tank 1 allows the upward flowing bottom cold water to rise along the inner wall of the water storage tank 1 and directly contact, collide and mix with the hot water at the top of the water storage tank 1 at the wall surface, rather than being randomly mixed in the middle of the water storage tank 1. This achieves pre-mixing of cold and hot water at the inner wall of the water storage tank 1 and speeds up the mixing efficiency.

[0033] Example 2: Please refer to Figure 8The guide structure 35 serves as a water storage hole, penetrating the sliding shell 33 and connecting it to the water storage tank 1. The water storage hole of the guide structure 35 is integrally injection molded with the sliding shell 33. Two or more guide structures 35 are provided along the length of the sliding shell 33, with the axis of each water storage hole parallel to the vertical direction of the sliding shell 33, ensuring smooth vertical flow of water in and out of the sliding shell 33. The water level inside the water storage tank 1 is higher than the guide structure 35, ensuring that the water storage hole is always submerged in water. This prevents air from entering the cavity between the circulation pressure plate 32 and the sliding shell 33 through the water storage hole, ensuring the sealing of the negative pressure cavity. If the water level is lower than the guide structure 35, air will be drawn into the cavity, causing the negative pressure to fail and preventing water from being drawn from the water storage tank 1. The circulation pressure plate 32 and the sliding shell 33 are connected in a sliding seal. When the sliding shell 33 is not pressed down, the telescopic rod 34 drives the circulating pressure plate 32 to move upward along the sliding shell 33, forming a negative pressure cavity between the circulating pressure plate 32 and the sliding shell 33. Under the action of negative pressure, the water in the water storage tank 1 is drawn into the negative pressure cavity by the guide structure 35. When the telescopic rod 34 drives the circulating pressure plate 32 to move downward along the sliding shell 33, the circulating pressure plate 32 pushes the sliding shell 33 down along the sliding groove 311 into the water storage tank 1 while applying pressure to the water in the negative pressure cavity, causing the water in the negative pressure cavity to be discharged into the water storage tank 1 through the guide structure 35. A reset rod 36 is provided between the top of the sliding shell 33 and the fixed seat 31. The elastic force generated by the reset rod 36 pulls the sliding shell 33 into the sliding groove 311. The reset rod 36 is made of spring to ensure that it can maintain stable elasticity after long-term repeated stretching. The outer diameter of the reset rod 36 is adapted to the installation space of the top of the sliding shell 33 and the bottom of the fixed seat 31 to avoid movement interference due to excessive size. The two ends of the reset rod 36 are detachable. In its natural state, the reset rod 36 is in a slightly stretched state, and the elastic force it generates is vertically upward, always acting on the sliding shell 33, pulling the sliding shell 33 upward and making it stably stay in the sliding groove 311.

[0034] Please see Figure 8When the guide structure 35 is a water storage hole, and the sliding shell 33 is not pressed down, the telescopic rod 34 drives the circulating pressure plate 32 to move upward inside the sliding shell 33, forming a negative pressure cavity between the sliding shell 33 and the circulating pressure plate 32. Under the suction effect of the negative pressure, the hot water at the top of the water tank 1 is drawn into the cavity through the guide structure 35 connected to the negative pressure cavity until the cavity between the sliding shell 33 and the circulating pressure plate 32 is filled with hot water. Then, the telescopic rod 34 drives the circulating pressure plate 32 to move the sliding shell 33 downward. The sliding shell 33 moves towards the cold water area at the bottom of the water tank 1. At the same time, the circulating pressure plate 32 applies pressure to the hot water in the cavity, causing the hot water to be discharged into the cold water area of ​​the water tank 1 through the guide structure 35. The hot water and cold water come into contact and mix here, thus completing the pre-mixing operation of hot and cold water in the water tank 1. When the sliding shell 33 moves to the bottom position of the water storage tank 1 and resets, the telescopic rod 34 drives the circulating pressure plate 32 to move upward again. A negative pressure cavity will be formed between the sliding shell 33 and the circulating pressure plate 32 again. The remaining water in the water storage tank 1 or the cold water at the bottom will be sucked into the cavity through the guide structure 35 under the action of negative pressure. When the circulating pressure plate 32 moves to the top limit position, the tensile force generated by the reset rod 36 stretched during the downward pressing of the sliding shell 33 will be converted into a gradually released elastic force, pulling the sliding shell 33 to move and reset towards the fixed seat 31. This reduces the volume of the cavity between the sliding shell 33 and the circulating pressure plate 32, and the water in the cavity is squeezed out from the guide structure 35. At this time, the water in the induction cooker 5 is flowing back to the water storage tank 1. The water with a lower temperature in the cavity and the water flowing back into the induction cooker 5 come into full contact and mix, thereby further improving the mixing efficiency of hot and cold water between the water storage tank 1 and the induction cooker 5.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] 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 water volume control device for testing an induction cooker, comprising a water storage tank (1) filled with water and an induction cooker (5) placed on the induction cooker for heating, wherein the induction cooker (5) and the water storage tank (1) are connected by a circulating water pipe (2), and both ends of the water storage tank (1) are connected to water supply pipes, each end of which is connected to a water pump, characterized in that: The water supply pipe includes a cold water pipe (11) and a hot water pipe (12). The cold water pipe (11) is located at the bottom of the water storage tank (1) to inject water into the water storage tank (1). The hot water pipe (12) is located at the top of the water storage tank (1) to collect water from the top of the water storage tank (1). Pressure sensors (7) are provided at both the bottom and top of the water storage tank (1). A circulation module (3) is also provided inside the water storage tank (1) to control the water circulation between the water storage tank (1) and the electromagnetic cooker (5). The circulation module (3) mixes the water inside the water storage tank (1) and the electromagnetic cooker (5) by changing the pressure inside the water storage tank (1). A top cover (4) is fixedly installed on the top of the water storage tank (1), and the circulation module (3) is fixedly installed on the top cover (4). The circulation module (3) includes a fixed base (31), a circulation pressure plate (32), and a sliding shell (33). The fixed base (31) is fixedly installed on the top of the water storage tank (1), and a sliding groove (311) with a width smaller than that of the water storage tank (1) is opened in the fixed base (31). The sliding shell (33) is slidably installed in the sliding groove (311) to change the internal pressure of the water storage tank (1). The circulation pressure plate (32) is slidably assembled in the sliding shell (33). A telescopic rod (34) is provided between the circulation pressure plate (32) and the fixed base (31). The bottom of the sliding shell (33) is provided with a mechanism to promote water circulation inside the water storage tank (1). The flow guiding structure (35) of the ring; when the telescopic rod (34) drives the circulating pressure plate (32) to press down, the circulating pressure plate (32) pushes the sliding shell (33) to press down vertically into the water storage tank (1), so that the internal volume of the water storage tank (1) decreases and the water pressure increases and is higher than the water pressure in the electromagnetic pot (5). The water in the water storage tank (1) is driven by the pressure difference to flow through the circulating water pipe (2) into the electromagnetic pot (5). At the same time, the flow guiding structure (35) comes into contact with the water in the water storage tank (1) as the sliding shell (33) is pressed down and changes the direction of water flow around the flow guiding structure (35) to promote the mixing of water in the water storage tank (1).

2. The water volume control device for testing induction cookers according to claim 1, characterized in that: The flow guiding structure (35) is composed of two or more inclined flow channels. The two or more flow guiding structures (35) are arranged on both sides of the bottom end of the sliding shell (33). The bottom end of the sliding shell (33) is processed with an inclined surface. The inclination direction and angle of the flow guiding structures (35) on both sides are the same as the inclination direction and angle of the inclined surface. Two or more flow guiding grooves (351) are opened on the flow guiding structure (35) along its length direction. The flow guiding grooves (351) penetrate the flow guiding structure (35) in the vertical direction. The flow guiding grooves (351) gradually reduce the diameter of the flow guiding opening in the vertical upward direction. When the flow guiding structure (35) is pressed down with the sliding shell (33), the water inside the water storage tank (1) is squeezed by the sliding shell (33) and flows upward along both sides, and the upward flowing water passes through the flow guiding grooves (351).

3. The water volume control device for testing an induction cooker according to claim 2, characterized in that: The flow guiding structures (35) on both sides are attached to the inner wall of the water storage tank (1).

4. The water volume control device for testing induction cookers according to claim 1, characterized in that: The flow guiding structure (35) is a water storage hole. The flow guiding structure (35) passes through the sliding shell (33) and connects the sliding shell (33) to the water storage tank (1). There are two or more flow guiding structures (35) along the length of the sliding shell (33). The water level inside the water storage tank (1) is higher than the flow guiding structure (35). The circulation pressure plate (32) is slidably sealed to the sliding shell (33). When the sliding shell (33) is in an unpressurized state, the telescopic rod (34) drives the circulation pressure plate (32) to move upward along the sliding shell (33). A negative pressure cavity is formed between the circulating pressure plate (32) and the sliding shell (33). Under the action of negative pressure, the water in the water storage tank (1) is drawn into the negative pressure cavity by the flow guiding structure (35). When the telescopic rod (34) drives the circulating pressure plate (32) to move downward along the sliding shell (33), the circulating pressure plate (32) applies pressure to the water in the negative pressure cavity while pushing the sliding shell (33) down along the sliding groove (311) into the water storage tank (1), so that the water in the negative pressure cavity is discharged into the water storage tank (1) through the flow guiding structure (35).

5. A water volume control device for testing induction cookers according to claim 4, characterized in that: A reset rod (36) is provided between the top of the sliding shell (33) and the fixed seat (31). The elastic force generated by the reset rod (36) pulls the sliding shell (33) into the sliding groove (311).

6. The water volume control device for testing induction cookers according to claim 1, characterized in that: The telescopic rod (34) is provided in two or more sets. One end of the telescopic rod (34) is fixedly connected to the fixed seat (31), and the other end of the telescopic rod (34) is fixedly connected to the circulating pressure plate (32). The telescopic rod (34) is a hydraulic rod.

7. A water volume control device for testing induction cookers according to claim 1, characterized in that: A valve (21) is installed on the circulating water pipe (2), and a liquid level sensor (8) is fixedly installed inside the water storage tank (1).

8. The water volume control device for testing an induction cooker according to claim 1, characterized in that: The induction cooker is provided in two or more sets, and the induction cooker is provided with two or more induction pots (5). A connecting pipe (6) is provided between the two or more induction pots (5), and the water storage tank (1) is provided with two or more circulating water pipes (2). Each circulating water pipe (2) is connected to one of the induction pots (5) on each set of the induction cooker.

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