Bathroom warm air equipment thermal element and performance test equipment and test method thereof

Abstract

The embodiment of the invention provides a bathroom warm air equipment thermal element and performance test equipment and test method thereof. The bathroom warm air equipment thermal element comprises a ceramic shell, a connector, a resistance wire, a frame, a back plate and a wiring terminal. The ceramic shell is connected with the connecting port, the connecting port is attached to the frame, the frame is connected with the back plate, the back plate is connected with the wiring terminal, and the wiring terminal is connected with the resistance wire. The contact area between the ceramic shell and the outside is increased through the plurality of concave cavities formed in the ceramic shell, so that the heating efficiency of the heating element of the bathroom warm air equipment is improved.

Description

Technical Field

[0001] The invention relates to the field of thermal elements of heating equipment, and in particular to a thermal element of bathroom heating equipment and a performance testing device and a testing method thereof. Background Art

[0002] One of the key components of a heating device is a thermal element, whose function is to convert electrical energy into thermal energy to generate warm air, thereby achieving temperature regulation in a specific space. Among them, bathroom heating devices are gradually becoming popular in homes and commercial places. These devices usually use electric heating elements to generate hot air to increase the temperature and comfort in the bathroom. However, the particularity of the bathroom environment, such as high temperature, high humidity and frequent temperature changes, may affect the performance and safety of the thermal element. In the prior art, the quality inspection of thermal elements often fails to fully consider these environmental factors, resulting in some potentially defective thermal elements failing during use after assembly, thereby affecting the normal operation of the equipment and the safety of the user.

[0003] Existing thermal elements mainly heat the resistance wire through power supply to generate the required heat. In order to ensure uniform heat distribution, a ceramic shell is usually added to the outside of the resistance wire to achieve uniform heat conduction and protect the internal resistance wire. The ceramic shell provides good thermal conductivity and prevents the external environment from directly affecting the resistance wire. However, existing thermal elements may have insufficient sealing, causing water and moisture to penetrate into the ceramic shell. This penetration not only causes oxidation and corrosion of the resistance wire, but may also cause short circuit failure in severe cases, thereby shortening the service life of the thermal element. Summary of the invention

[0004] According to an embodiment of the present invention, a bathroom heating device thermal element and performance testing device and method thereof are provided to solve the problem that the existing testing process usually uses manual replacement of thermal elements one by one for random inspection, which prolongs the operation time and increases the labor cost.

[0005] In a first aspect of the present invention, a thermal element of a bathroom heating device is provided.

[0006] The thermal element of the bathroom heating device includes a ceramic shell, a connecting port, a resistance wire, a frame, a sealing ring, a back plate and a wiring terminal; the ceramic shell is connected to the connecting port, the connecting port is fitted with the frame, the frame is connected to the sealing ring, the frame is connected to the back plate, the back plate is connected to the wiring terminal, and the wiring terminal is connected to the resistance wire.

[0007] Preferably, it further comprises a plurality of recessed cavities; the plurality of recessed cavities are arranged on the ceramic shell.

[0008] In a second aspect of the present invention, a bathroom heating device thermal element performance test device is provided, comprising a housing, a temperature probe, a processing unit, a plurality of positioning mechanisms, a first test unit and a second test unit, a switching mechanism and a power supply unit; the power supply unit is connected to the bathroom heating device thermal element, a plurality of the positioning mechanisms are arranged on the switching mechanism, and the plurality of the positioning mechanisms are used to fix the power supply unit and the bathroom heating device thermal element; The switching mechanism includes a first motor, a first gear, a rotating disk, a first gear ring, a partition, a plurality of circular holes and a bracket; The output end of the first motor is connected to the first gear, the first gear is meshed with the first gear ring connected to the turntable, the turntable is connected to the partition, a plurality of circular holes are arranged on the turntable, and the turntable is slidably connected to the bracket.

[0009] Preferably, the positioning mechanism comprises a clamping plate, a friction rod and a heat insulation pad; The friction rod is connected to the rotating disk, the friction rod is slidably connected to the clamping plate, and the clamping plate is connected to the heat insulation pad.

[0010] Preferably, a partition is connected to the interior of the shell, the partition is connected to an arc-shaped plate, and the first test unit includes a water tank, a liquid outlet pipe, a first one-way valve, an atomizing nozzle, an exhaust valve, an air inlet pipe and a second one-way valve; The water tank is connected to the liquid outlet pipe, the liquid outlet pipe is connected to the first one-way valve, the liquid outlet pipe is connected to the atomizing nozzle, the water tank is connected to the exhaust valve, the water tank is connected to the air intake pipe, and the air intake pipe is connected to the second one-way valve.

[0011] Preferably, the second test unit comprises a contact rod, a frame, a torsion spring, a telescopic cylinder and a screw; The frame is rotatably connected to the contact rod, a torsion spring is installed between the frame and the contact rod, the contact rod is slidably connected to the telescopic cylinder, and the screw is used to fix the contact rod and the telescopic cylinder.

[0012] Preferably, a linkage mechanism is provided on the housing; The linkage mechanism includes a second motor, a cam, a round wheel, a contact plate, a limit rod, a bump, a piston, a cylinder, a third one-way valve and a compression spring; The output end of the second motor passes through the shell and is connected to the cam, the cam is rotatably connected to the round wheel, the contact plate is connected to the piston, the piston is slidably connected to the cylinder, the cylinder is connected to the third one-way valve, the intake pipe is connected to the cylinder, the contact plate is connected to the limit rod, the limit rod passes through the bump, and a compression spring is connected between the contact plate and the bump.

[0013] Preferably, an auxiliary mechanism is provided on the housing; The auxiliary mechanism includes a first housing, a fan, a second housing, a refrigeration device, a ring pipe and a circulation pump; The first shell is connected to the casing, the first shell is connected to the fan, the annular tube is arranged inside the first shell, one end of the annular tube passes through the first shell and the second shell and extends to the inside of the second shell, the other end of the annular tube is connected to the circulation pump, the input end of the circulation pump passes through the second shell, and the second shell is connected to the refrigeration equipment.

[0014] Preferably, a sealing mechanism is provided inside the housing; The sealing mechanism includes a water baffle, a movable baffle, a slider, a slide rail, a rack, a second gear, a shaft, a contact switch, a third gear and a second gear ring; The water baffle is connected to the shell, and the water baffle is used to cover the first shell. The water baffle is fitted with the movable baffle, and the movable baffle is connected to the slider, and the slider is slidably connected to the slide rail. The movable baffle is connected to the rack, and the rack is meshed with the second gear, the second gear is connected to the shaft, and the shaft is rotatably connected to the shell, the shaft is connected to the third gear, and the third gear is meshed with the second gear ring connected to the turntable, and the contact switch is connected to the shell.

[0015] In a third aspect of the present invention, a method for testing the performance of a thermal element of a bathroom heating device is provided, the method comprising: Connect the sample to be tested: Seal the connection terminals on the thermal element of the bathroom heating equipment to the power supply unit; Fix the sample to be tested: Use the positioning mechanism to fix the power supply unit and the bathroom heating device thermal element on the turntable; Conduct the first test: unscrew the screw, pull the telescopic cylinder upward, screw in the screw to position the telescopic cylinder, start the second motor, the second motor drives the round wheel on the cam to contact the contact plate, the contact plate drives the piston to move, the piston movement injects the air in the cylinder into the water tank, the pressure in the water tank increases, the water and air in the water tank are sprayed out from the atomizing nozzle, a high humidity environment is formed in the shell, the power supply unit supplies power to the resistance wire in the thermal element of the bathroom heating device, the resistance wire heats up, and the temperature probe monitors and records the temperature change of the resistance wire; The first motor is started, the first motor drives the first gear to rotate, the first gear meshes with the first gear ring to rotate, the first gear ring drives the turntable to rotate, and when the turntable rotates, different samples are switched to be tested in a high humidity environment; Conduct the second test: unscrew the screw, pull the telescopic cylinder downward, screw in the screw to position the telescopic cylinder, start the second motor, the second motor drives the round wheel on the cam to contact the contact plate, the contact plate drives the piston to move, the piston movement injects the air in the cylinder into the water tank, the water in the water tank is sprayed out from the atomizing nozzle, and a high humidity environment is formed in the shell; at the same time, the round wheel on the cam contacts the telescopic cylinder, the telescopic cylinder drives the contact rod to rotate, the contact rod applies mechanical stress to the ceramic shell, the power supply unit supplies power to the resistance wire in the thermal element of the bathroom heating device, the resistance wire heats up, and the temperature probe monitors and records the temperature change of the resistance wire; The first motor is started, the first motor drives the first gear to rotate, the first gear meshes with the first gear ring to rotate, the first gear ring drives the turntable to rotate, and when the turntable rotates, different samples are switched to be tested under high humidity environment and mechanical stress; Comparison results: Compare the temperature change of the temperature probe of the same sample during the first test and the temperature change of the temperature probe during the second test to determine whether the thermal element of the bathroom heating equipment meets the factory standards.

[0016] One or more technical solutions provided in this application have at least the following technical effects or advantages: 1. The present invention provides a bathroom heating device thermal element and a performance testing device and a testing method thereof. The contact area between the ceramic shell and the outside world is increased by setting a plurality of recessed cavities on the ceramic shell, thereby improving the heating efficiency of the bathroom heating device thermal element. At the same time, a sealing ring is also set at the position of the frame and the connecting port. When used in a bathroom with high humidity, water vapor is prevented from entering the gap between the frame and the connecting port from the outside world, thereby ensuring the normal operation of the bathroom heating device thermal element.

[0017] 2. The present invention provides a bathroom heater thermal element and a performance testing device and a testing method thereof. The first testing step is used to test whether the bathroom heater thermal element works normally in a high humidity environment. The second testing step is used to enlarge the cracks on the surface of the ceramic shell that are difficult to be found by the naked eye, thereby testing whether it can work normally in a high humidity environment. The temperature change curve of the resistance wire during heating can be monitored by the temperature probe. By using the above two testing steps and with the help of the temperature probe, it can be intuitively found whether the resistance wire and the outer ceramic shell meet the factory standards, which is convenient for the tester to operate.

[0018] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other features, advantages and aspects of the embodiments of the present invention will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein: Figure 1 A schematic diagram showing the structure of a thermal element of a bathroom heating device according to an embodiment of the present invention is shown; Figure 2 It shows a schematic structural diagram of a bathroom heating device thermal element performance testing device according to an embodiment of the present invention; Figure 3 A partial cross-sectional view of a bathroom heating device thermal element performance testing device according to an embodiment of the present invention is shown; Figure 4 A schematic diagram showing the connection structure of a housing, a processing unit and a first motor of a bathroom heating device thermal element performance testing device according to an embodiment of the present invention is shown; Figure 5 A schematic diagram showing the structure of a temperature probe, a housing and a circular hole of a bathroom heating device thermal element performance testing device according to an embodiment of the present invention is shown; Figure 6 A schematic diagram showing the connection structure of the positioning mechanism of a bathroom heating device thermal element performance testing device according to an embodiment of the present invention is shown; Figure 7 A schematic diagram showing the connection structure of a power supply unit, a partition plate and an arc plate of a bathroom heating device thermal element performance test device according to an embodiment of the present invention is shown; Figure 8 It shows a schematic diagram of the connection structure of the first test unit, the second test unit and the linkage mechanism of the bathroom heating device thermal element performance test device according to an embodiment of the present invention; Fig. 9 A schematic diagram showing the connection structure of the linkage mechanism of a bathroom heating device thermal element performance testing device according to an embodiment of the present invention is shown; Fig.10 A schematic structural diagram of a sealing mechanism of a bathroom heating device thermal element performance testing device according to an embodiment of the present invention is shown; Fig.11 A schematic diagram showing the connection structure of a movable baffle, a slide rail and a slider of a bathroom heating device thermal element performance test device according to an embodiment of the present invention is shown; Fig.12 It shows a schematic diagram of the connection structure of the second gear, the shaft body and the contact switch of the bathroom heating device thermal element performance testing device according to an embodiment of the present invention; Fig.13 A schematic diagram showing the connection structure of a first housing, a fan and a circulation pump of a bathroom heating device thermal element performance test device according to an embodiment of the present invention is shown; Fig.14 A schematic diagram of the connection structure of a refrigeration device, a ring pipe and a circulation pump of a bathroom heating device thermal element performance testing device according to an embodiment of the present invention is shown.

[0020] The reference numerals are as follows: 1-shell, 2-bathroom heating equipment thermal element, 201-ceramic shell, 202-recessed cavity, 203-resistance wire, 204-back plate, 205-terminal, 206-sealing ring, 207-connection port, 208-frame, 3-switching mechanism, 301-first motor, 302-first gear, 303-turntable, 304-first gear ring, 305-partition, 306-round hole, 307-support Frame, 4-positioning mechanism, 401-card, 402-friction rod, 403-insulation pad, 404-through slot, 5-first test unit, 501-water tank, 502-liquid outlet pipe, 503-first one-way valve, 504-atomizing nozzle, 505-exhaust valve, 506-intake pipe, 507-second one-way valve, 6-auxiliary mechanism, 601-first shell, 602-fan, 603-second shell, 6 04-refrigeration equipment, 605-annular tube, 606-circulating pump, 7-closing mechanism, 701-water baffle, 702-movable baffle, 703-slide rail, 704-slider, 705-rack, 706-second gear, 707-axis, 708-contact switch, 709-third gear, 710-second gear ring, 8-second test unit, 801-contact rod, 802-frame, 803-torsion spring, 804-telescopic cylinder, 805-screw, 9-linkage mechanism, 901-contact plate, 902-piston, 903-third one-way valve, 904-limit rod, 905-compression spring, 906-cam, 907-round wheel, 908-second motor, 909-cylinder, 910-bump, 10-power supply unit, 11-partition, 12-arc plate, 13-processing unit, 14-temperature probe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0023] like Figures 1 to 14 As shown, the bathroom heating device thermal element 2 comprises a ceramic shell 201, a connection port 207, a resistance wire 203, a frame 208, a sealing ring 206, a back plate 204 and a terminal 205. The ceramic shell 201 is connected to the connection port 207, and the resistance wire 203 is arranged inside the ceramic shell 201. The resistance wire 203 is arranged inside the ceramic shell 201 to distribute the heat generated by the resistance wire 203, reduce the heat concentration phenomenon, and improve the heating efficiency. The frame 208 is closely fitted with the connection port 207 to prevent external water vapor from entering the interior of the ceramic shell 201. The frame 208 is connected to the sealing ring 206, and the sealing ring 206 arranged on the frame 208 improves the sealing performance between the frame 208 and the ceramic shell 201. It prevents water vapor from invading the interior of the ceramic shell 201, and prevents water vapor from affecting the resistance wire 203 inside the ceramic shell 201 when the thermal element is actually working in the bathroom, thereby ensuring the stability and safety of the resistance wire 203 in a high humidity working environment. The sealing ring 206 is made of ethylene propylene diene monomer rubber, which has good heat resistance and chemical stability, maintains good performance in high temperature environment, is suitable for high temperature and humid places such as bathrooms, and has good corrosion resistance to chemical substances such as water, acid, and alkali. The frame 208 is connected to the back plate 204, and the back plate 204 is connected to the wiring terminal 205. The wiring terminal 205 is connected to the resistance wire 203, and the material of the resistance wire 203 is a high conductivity alloy to improve the heating speed and efficiency. The resistance wire 203 is composed of a plurality of bent rod-like structures inside the ceramic shell 201, and the plurality of bent rod-like structures are arranged equidistantly.

[0024] In actual use, the terminal 205 is connected to an external power supply device. After the power supply device is started, the current flows to the resistance wire 203, and the temperature of the resistance wire 203 gradually increases through the Joule heating effect. The resistance wire 203 is wrapped by the ceramic shell 201. The ceramic material not only has chemical stability and corrosion resistance, preventing the erosion of the resistance wire 203 by external water vapor, but also provides electrical insulation performance to prevent the resistance wire 203 from short-circuiting under high temperature conditions. At the same time, the low thermal conductivity of the ceramic shell 201 helps to retain heat, improve energy efficiency, and ensure that the resistance wire 203 operates at a suitable operating temperature. The service life of the resistance wire 203 is extended and the risk of failure is reduced.

[0025] Furthermore, it also includes a plurality of recessed cavities 202 ; the plurality of recessed cavities 202 are arranged on the ceramic shell 201 .

[0026] In actual use, the multiple recessed cavities 202 arranged on the ceramic shell 201 increase the contact area between the ceramic shell 201 and the outside, thereby improving the heating efficiency of the thermal element 2 of the bathroom heating device.

[0027] In addition, another embodiment of the present invention further provides a bathroom heating device thermal element performance test device, which is used to test the bathroom heating device thermal element 2, including a housing 1, a temperature probe 14, a processing unit 13, a plurality of positioning mechanisms 4, a first test unit 5 and a second test unit 8, a switching mechanism 3 and a power supply unit 10. The processing unit 13 includes a microprocessor and a storage device, the temperature probe 14 monitors the ambient temperature, and converts the temperature change monitored by the temperature probe 14 into an electrical signal, and after analog-to-digital conversion, the analog voltage signal is converted into a digital value and input into the microprocessor, so as to realize the monitoring of the temperature change of the bathroom heating device thermal element 2, and the microprocessor sends a control signal through the output port to control the power supply unit 10 to start the power supply to the resistance wire 203, and the above signal transmission and control of the power supply unit 10 and the temperature probe 14 start mode are prior art, which will not be described in detail here. The power supply unit 10 is connected to the bathroom heating device thermal element 2, and the plurality of positioning mechanisms 4 are arranged on the switching mechanism 3, and the plurality of positioning mechanisms 4 are used to fix the power supply unit 10 and the bathroom heating device thermal element 2. The power supply unit 10 provides electric energy to the thermal element 2 of the bathroom heating device, simulating that the thermal element 2 of the bathroom heating device is heated in the heating device. The switching mechanism 3 includes a first motor 301, a first gear 302, a turntable 303, a first gear ring 304, a partition 305, a plurality of circular holes 306 and a bracket 307. The output end of the first motor 301 is connected to the first gear 302, and the first motor 301 is used to drive the first gear 302 to rotate. The first gear 302 is meshed with the first gear ring 304 connected to the turntable 303, and the first gear 302 will mesh with the first gear ring 304 to rotate when rotating. The turntable 303 is connected to the partition 305, and the partition 305 divides the turntable 303 into eight spaces, each of which is provided with a positioning mechanism 4, and the number of circular holes 306 is also 8, corresponding to the positioning mechanism 4. A plurality of circular holes 306 are provided on the turntable 303 , and the turntable 303 is slidably connected to the bracket 307 . The bracket 307 is used to support the turntable 303 , and the housing 1 fits the turntable 303 . Under the limit of the housing 1 and the bracket 307 , the normal rotation of the turntable 303 is ensured.

[0028] In actual use, the user can start the first motor 301. When the first motor 301 is started, the first gear 302 is driven to rotate. The first gear 302 meshes with the first gear ring 304 to rotate. The first gear ring 304 drives the turntable 303 to rotate during the rotation. Under the drive of the first motor 301, the bathroom heating device thermal element 2 on the turntable 303 corresponds to the temperature probe 14. The temperature probe 14 monitors the temperature change of the bathroom heating device thermal element 2 through the round hole 306 on the turntable 303. When the first motor 301 stops rotating, the microprocessor in the processing unit 13 controls the power supply unit 10 to supply power to the resistance wire 203. The temperature probe 14 records the temperature change of the resistance wire 203 and outputs it in the form of an electrical signal. Finally, the electrical signal is converted into a digital value and sent to the processing unit 13 for storage. Under the control of the processing unit 13, multiple samples are tested in sequence without the need for manual replacement of samples, saving labor costs.

[0029] Furthermore, the positioning mechanism 4 includes a card plate 401, a friction rod 402 and a heat insulation pad 403. The partition 305 divides the turntable 303 into 8 spaces, and two positioning mechanisms 4 are arranged in each space for fixing the power supply unit 10 and the bathroom heater thermal element 2. The friction rod 402 is connected to the turntable 303, and the friction rod 402 is slidably connected to the card plate 401. The temperature of the thermal element in the heater is usually between 150°C and 200°C. The outer side of the friction rod 402 is coated with a tough expanded polytetrafluoroethylene. The expanded polytetrafluoroethylene is expanded and processed to make the expanded polytetrafluoroethylene flexible and plastic, and still maintains the chemical resistance and high temperature resistance of polytetrafluoroethylene, and the high temperature resistance can reach 260°C. The flexible expanded polytetrafluoroethylene restricts the arbitrary movement of the card plate 401. The card plate 401 can only be moved when the expanded polytetrafluoroethylene on the outside of the friction rod 402 is compressed and deformed by pulling the card plate 401 with force, thereby ensuring the stability of the sample after fixation. A through groove 404 for fixing the power supply unit 10 or the thermal element 2 of the bathroom heating device is provided in the direction of the card plate 401 close to the turntable 303. The card plate 401 is connected to the thermal insulation pad 403, and the connection position of the thermal insulation pad 403 and the card plate 401 is the position of the through groove 404 for fixing the power supply unit 10 or the thermal element 2 of the bathroom heating device.

[0030] In actual use, the user can place the power supply unit 10 and the bathroom heating device thermal element 2 between the card plate 401 and the turntable 303, and press the card plate 401 so that the card plate 401 is pressed against the power supply unit 10 or the bathroom heating device thermal element 2. The power supply unit 10 and the bathroom heating device thermal element 2 are fixed, and the stability of the power supply unit 10 and the bathroom heating device thermal element 2 during the test is ensured. The overall structure is simple, and the production cost is saved. At the same time, the operator only needs to place the power supply unit 10 and the bathroom heating device thermal element 2 on the turntable 303 and then push the card plate 401 into the friction rod 402 to press and fix the power supply unit 10 and the bathroom heating device thermal element 2, which is convenient for the operator to fix multiple bathroom heating devices 2 to be tested, thereby improving work efficiency.

[0031] Furthermore, the interior of the shell 1 is connected with a partition 11, and the partition 11 is connected with an arc plate 12, and the arc plate 12 blocks the side of the turntable 303. The partition 11 and the arc plate 12 close the gap between the turntable 303 and the shell 1 when it rotates, so as to prevent a large amount of water vapor from being emitted to the outside. The first test unit 5 includes a water tank 501, a liquid outlet pipe 502, a first one-way valve 503, an atomizing nozzle 504, an exhaust valve 505, an air inlet pipe 506 and a second one-way valve 507. The water tank 501 is connected to the liquid outlet pipe 502, and the liquid outlet pipe 502 is connected to the first one-way valve 503. The first one-way valve 503 limits water and a small amount of air from entering the atomizing nozzle 504 from the water tank 501 and being sprayed out. The liquid outlet pipe 502 is connected to the atomizing nozzle 504, the water tank 501 is connected to the exhaust valve 505, and the water tank 501 is connected to the air inlet pipe 506. An air pump or the like can be installed at one end of the air inlet pipe 506 away from the water tank 501 to pump air into the water tank 501. The air inlet pipe 506 is connected to the second one-way valve 507, and the second one-way valve 507 restricts air from entering the water tank 501 only from the air inlet pipe 506.

[0032] In actual use, the user stores water in the water tank 501 in advance. When it is necessary to simulate the operation of the thermal element in a high humidity environment, the air from the air inlet pipe 506 enters the water tank 501. As the air pressure in the water tank 501 increases, water and a small part of air can only be sprayed out from the atomizing nozzle 504. It should be noted that the position where the atomizing nozzle 504 sprays water mist corresponds to the position of the sample. The simulation of the high humidity environment is achieved. High humidity may cause material corrosion or insulation failure. By simulating the high humidity environment, these potential problems can be identified to ensure the long-term reliability of the thermal element. The test results can help optimize the material selection and structural design of the thermal element and improve the durability of the thermal element in a humid environment.

[0033] Further, the second test unit 8 includes a contact rod 801, a frame 802, a torsion spring 803, a telescopic cylinder 804 and a screw 805. The frame 802 is rotatably connected to the contact rod 801, and the contact rod 801 can rotate relative to the frame 802, wherein the shape of the contact rod 801 close to the end of the sample to be tested is not limited, and the position where the sample needs to be subjected to mechanical stress is selected according to needs. A torsion spring 803 is installed between the frame 802 and the contact rod 801. The contact rod 801 is slidably connected to the telescopic cylinder 804, and the telescopic cylinder 804 can move relative to the contact rod 801. When the telescopic cylinder 804 slides upward, the second motor 908 drives the cam 906 to rotate and cannot contact the telescopic cylinder 804, that is, the mechanical stress test of the thermal element 2 of the bathroom heating device is stopped. The screw 805 is used to fix the contact rod 801 and the telescopic cylinder 804. The screw 805 can fix the position of the telescopic cylinder 804, and then determine whether to perform a mechanical stress test on the thermal element 2 of the bathroom heating device.

[0034] In actual use, the contact rod 801 is used to apply mechanical stress to the surface of the sample to be tested. The mechanical stress applied by the contact rod 801 to the sample to be tested can simulate the mechanical load that may be encountered in actual use, and help evaluate the durability and long-term stability of the thermal element. At the same time, the applied stress can reveal potential defects in the outermost ceramic material and structure of the sample, such as microcracks or weaknesses, and then detect whether the ceramic shell 201 meets the standards during the firing process and whether it will affect the normal operation of the internal resistance wire 203.

[0035] Furthermore, a linkage mechanism 9 is provided on the housing 1. The linkage mechanism 9 includes a second motor 908, a cam 906, a round wheel 907, a contact plate 901, a limit rod 904, a bump 910, a piston 902, a cylinder 909, a third one-way valve 903 and a compression spring 905. The output end of the second motor 908 passes through the housing 1 and is connected to the cam 906. The second motor 908 is arranged outside the housing 1, which avoids the second motor 908 existing in the housing 1 in a high humidity environment, thereby extending the service life of the second motor 908. The cam 906 is rotatably connected to the round wheel 907, and the round wheel 907 can rotate relative to the cam 906. The round wheel 907 is installed on the raised position of the cam 906. The contact plate 901 is connected to the piston 902, which is slidably connected to the cylinder 909. The piston 902 can move inside the cylinder 909. The cylinder 909 is connected to the third one-way valve 903. The third one-way valve 903 restricts air from entering the piston 902 from the outside. The air inlet end of the third one-way valve 903 is arranged on the outside of the housing 1, so as to prevent the water vapor in the housing 1 from entering the cylinder 909. The air inlet pipe 506 is connected to the cylinder 909, and the contact plate 901 is connected to the limit rod 904. The limit rod 904 passes through the protrusion 910. A compression spring 905 is connected between the contact plate 901 and the protrusion 910. The compression spring 905 gives the contact plate 901 an elastic force that always faces the cam 906.

[0036] In actual use, the user can start the second motor 908. After starting, the second motor 908 will drive the cam 906 and the round wheel 907 on the cam 906 to rotate. The round wheel 907 contacts the telescopic cylinder 804 during the rotation. At this time, the contact rod 801 and the end of the telescopic cylinder 804 close to the sample will rotate in the direction away from the sample. At this time, the torsion spring 803 undergoes elastic deformation. When the round wheel 907 is no longer in contact with the telescopic cylinder 804, the elastic deformation of the torsion spring 803 will drive the contact rod 801 to apply mechanical stress to the surface of the sample to be tested. The impact force of the contact rod 801 is related to the elastic force of the torsion spring 803 itself. The torsion spring 803 with different elastic forces can be replaced as needed to adjust the impact force of the contact rod 801. At the same time, during the rotation of the cam 906 and the round wheel 907, the contact plate 901 will be driven to move. The contact plate 901 drives the piston 902 to compress the space inside the cylinder 909. The compressed air enters the air intake pipe 506 to increase the pressure in the water tank 501, thereby spraying water mist to simulate a high humidity environment. When the round wheel 907 is separated from the contact plate 901, the elastic deformation of the compression spring 905 will drive the contact plate 901 to reset, so that the round wheel 907 touches the contact plate 901 to move next time. A relay is used to control the start and stop of the second motor 908 and the first motor 301, and the relay is connected to the second motor 908 and the first motor 301. The microprocessor in the processing unit 13 sends a start signal to the relay through the output port, the relay starts, the electromagnet inside the relay generates a magnetic field, attracts the armature to move, makes the moving contact contact with the static contact, forms a complete circuit, and directs the power supply to the motor. When the motor starts smoothly, the relay immediately disconnects the moving contact and the static contact, thereby cutting off the power supply and preventing the motor from overloading. If the motor needs to be turned off, it can be achieved by reverse triggering the relay or using other control devices. The above process is achieved by sending a signal from the output port of the processing unit 13. In terms of programming, the Arduino development environment is used to write code to control the microprocessor to output a high level or a low level, thereby controlling the switch state of the relay. Relying on the drive of the second motor 908, a high humidity environment is triggered in the housing 1, and at the same time, the application of mechanical stress to the surface of the sample to be tested is achieved, saving the number of electric components and reducing subsequent maintenance costs.

[0037] Further, the housing 1 is provided with an auxiliary mechanism 6. The auxiliary mechanism 6 includes a first housing 601, a fan 602, a second housing 603, a refrigeration device 604, an annular pipe 605 and a circulation pump 606. The first housing 601 is connected to the housing 1, and the first housing 601 is connected to the fan 602. The annular pipe 605 is arranged inside the first housing 601, and the material of the annular pipe 605 is copper. One end of the annular pipe 605 passes through the first housing 601 and the second housing 603 and extends to the inside of the second housing 603, and the other end of the annular pipe 605 is connected to the circulation pump 606, and the input end of the circulation pump 606 passes through the second housing 603. The circulation pump 606 circulates the water in the second housing 603 through the annular pipe 605, and realizes heat exchange with the water vapor in the housing 1 and the first housing 601. The second housing 603 is connected to the refrigeration equipment 604, which includes a compressor, a condenser, an expansion valve and an evaporator, wherein the evaporator is placed inside the second housing 603 and directly contacts the water to improve the heat exchange efficiency. The condenser can be placed outside the second housing 603 to discharge heat. The compressor is responsible for circulating the refrigerant and adjusting the pressure through the expansion valve, thereby absorbing the heat of the water in the evaporator, and finally achieving the cooling of the water.

[0038] In actual use, during the test, the water sprayed from the atomizing nozzle 504 contacts the high-temperature sample and gasifies into water vapor, so that a high humidity environment is formed in the housing 1. The refrigeration device 604 refrigerates the water in the second housing 603, and the circulating pump 606 circulates the water in the second housing 603 through the annular tube 605. The low-temperature water in the annular tube 605 performs heat exchange with the water in the housing 1 and the first housing 601, thereby realizing the liquefaction of water vapor. The method of condensing the circulating low-temperature water in the annular tube 605 accelerates the speed of emptying the water vapor in the housing 1. A drain port is provided below the first housing 601 for discharging liquefied water. The fan 602 corresponds to the position of the annular tube 605, and the blowing direction of the fan 602 is directly facing the annular tube 605. The fan 602 promotes the contact between the water vapor in the housing 1 and the surface of the annular tube 605 by accelerating the flow speed of the airflow, thereby increasing the heat transfer rate of the water vapor. The use of fan 602 to disturb the airflow helps to break the boundary layer of water vapor, so that higher concentration of water vapor contacts the surface of annular tube 605, thereby accelerating the condensation process. In addition, fan 602 can also reduce the temperature difference around annular tube 605, thereby improving the processing efficiency. It also avoids excessive water accumulation in housing 1 in a short period of time, reduces the number of manual cleaning times, and reduces labor costs.

[0039] Further, a closing mechanism 7 is provided inside the housing 1. The closing mechanism 7 includes a water baffle 701, a movable baffle 702, a slider 704, a slide rail 703, a rack 705, a second gear 706, a shaft 707, a contact switch 708, a third gear 709 and a second gear ring 710. The water baffle 701 is connected to the housing 1, and the water baffle 701 is used to shield the first shell 601, and the water baffle 701 can prevent liquefied water from entering the housing 1. The water baffle 701 fits with the movable baffle 702, the movable baffle 702 is connected with the slider 704, the slider 704 is slidably connected with the slide rail 703, the movable baffle 702 is connected with the rack 705, the rack 705 is meshedly connected with the second gear 706, the second gear 706 is connected with the shaft 707, the shaft 707 is rotatably connected with the housing 1, and the shaft 707 is connected with the third gear 709. The third gear 709 meshes with the second gear ring 710 connected to the rotating disk 303, and the arc of the second gear ring 710 is 45 degrees. The contact switch 708 is connected to the housing 1, and the contact switch 708 is arranged just above the rack 705. After the rack 705 contacts the contact switch 708, the contact switch 708 sends a signal to the processing unit 13, and the processing unit 13 controls the fan 602 to start, thereby accelerating the air flow speed inside the housing 1 and improving the liquefaction effect of the water vapor in the housing 1.

[0040] In actual use, the turntable 303 completes the test of multiple samples after one rotation. When the turntable 303 rotates one circle, the second gear ring 710 meshes with the third gear 709, and the third gear 709 drives the second gear 706 to rotate synchronously. During the rotation of the second gear 706, the meshing rack 705 rises and falls. At this time, the lower movable baffle 702 moves upward to leak the fan 602 in the first shell 601. The movable baffle 702 isolates the first shell 601 and the housing 1 during the test, thereby reducing the temperature in the first shell 601. When the third gear 709 is about to disengage from the second gear ring 710, the first motor 301 stops driving, and the rack 705 contacts the contact switch 708 at this time. The contact switch 708 sends a signal to the processing unit 13, and the processing unit 13 controls the fan 602 and the circulation pump 606 to start, liquefy the water vapor, and speed up the recovery of the water vapor. In the process of the test, the turntable 303 rotates two times in total. When the contact switch 708 is touched during the first rotation, the fan 602 and the circulating pump 606 are not started, and the water vapor in the housing 1 is not emptied. When the contact switch 708 is touched for the second time, the processing unit 13 controls the fan 602 and the circulating pump 606 to start to quickly empty the water vapor in the housing 1. The microprocessor in the processing unit 13 needs to detect the pressing event of the contact switch 708 and perform the start operation after the contact switch 708 is touched twice. This is achieved by setting a counter variable in the program of the microprocessor. Each time the contact switch 708 is pressed, the counter variable increases. When the counter variable reaches 2, the code for starting the fan 602 and the circulating pump 606 is executed. When a set of tests is completed, the value of the counter variable is reset to prepare for the judgment of the next start condition. At this point, the test work on multiple samples is completed, and the user observes the disassembly of the sample and the surface of the sample, and at the same time, the situation of each sample is known according to the information stored in the processing unit 13. The water vapor in the shell 1 is automatically processed after the work is completed, and the entire process of recovering the water vapor does not require human intervention, thus saving labor costs.

[0041] In addition, another embodiment of the present invention further provides a method for testing the performance of a thermal element of a bathroom heating device, comprising the following steps: Connect the sample to be tested: seal the connection terminal 205 on the thermal element 2 of the bathroom heating device with the power supply unit 10. The sealed connection method is used to avoid leakage between the connection terminal 205 and the power supply unit 10 during testing in a high humidity environment, which may affect the accuracy of the test results.

[0042] Fix the sample to be tested: Use the positioning mechanism 4 to fix the power supply unit 10 and the bathroom heater thermal element 2 on the turntable 303. The positioning mechanism 4 ensures the stability of the power supply unit 10 and the bathroom heater thermal element 2, and prevents the power supply unit 10 and the bathroom heater thermal element 2 from shifting when the turntable 303 rotates, without affecting the accuracy of the result.

[0043] The first test is performed: screw down the screw 805, pull the telescopic cylinder 804 upward, screw in the screw 805 to position the telescopic cylinder 804. After the telescopic cylinder 804 is pulled upward, when the second motor 908 drives the cam 906 and the round wheel 907 on the cam 906 to rotate, the round wheel 907 will not contact the telescopic cylinder 804. Start the second motor 908, the second motor 908 drives the round wheel 907 on the cam 906 to contact the contact plate 901, the contact plate 901 drives the piston 902 to move, the piston 902 moves to inject the air in the cylinder 909 into the water tank 501, the pressure in the water tank 501 increases, the water and air in the water tank 501 are sprayed out from the atomizing nozzle 504, and a high humidity environment is formed in the housing 1. The power supply unit 10 supplies power to the resistance wire 203 in the thermal element 2 of the bathroom heating device, the resistance wire 203 heats up, and the temperature probe 14 monitors and records the temperature change of the resistance wire 203. When performing the first test, a high humidity environment is only formed in the housing 1, the purpose of which is to monitor whether the resistance wire 203 works normally in the high humidity environment.

[0044] The first motor 301 is started, and the first motor 301 drives the first gear 302 to rotate, and the first gear 302 meshes with the first gear ring 304 to rotate, and the first gear ring 304 drives the turntable 303 to rotate. When the turntable 303 rotates, different samples are switched to be tested in a high humidity environment. When the first motor 301 stops rotating, the microprocessor in the processing unit 13 controls the power supply unit 10 to supply power to the resistance wire 203. The temperature probe 14 records the temperature change of the resistance wire 203, outputs it in the form of an electrical signal, and finally converts the electrical signal into a digital value and sends it to the processing unit 13 for storage. Under the control of the processing unit 13, the first motor 301 is driven to drive the turntable 303 to rotate to realize the testing of multiple samples in sequence, without the need to manually replace the samples, saving labor costs.

[0045] The second test is performed: screw down the screw 805, pull the telescopic cylinder 804 downward, and screw in the screw 805 to position the telescopic cylinder 804. After the telescopic cylinder 804 is pulled downward, the second motor 908 drives the cam 906 and the round wheel 907 on the cam 906 to rotate, and the round wheel 907 contacts the telescopic cylinder 804 and drives the telescopic cylinder 804 to move. The second motor 908 is started, and the second motor 908 drives the round wheel 907 on the cam 906 to contact the contact plate 901, and the contact plate 901 drives the piston 902 to move. The movement of the piston 902 injects the air in the cylinder 909 into the water tank 501, and the water in the water tank 501 is sprayed out from the atomizing nozzle 504, and a high humidity environment is formed in the shell 1; at the same time, the round wheel 907 on the cam 906 contacts the telescopic cylinder 804, and the telescopic cylinder 804 drives the contact rod 801 to rotate, and the contact rod 801 applies mechanical stress to the ceramic shell 201, and the power supply unit 10 supplies power to the resistance wire 203 in the thermal element 2 of the bathroom heating device, and the resistance wire 203 heats up, and the temperature probe 14 monitors and records the temperature change of the resistance wire 203. When performing the second test, not only is a high humidity environment formed in the shell 1, but the contact rod 801, driven by the second motor 908, applies mechanical stress to the surface of the ceramic shell 201 in order to prevent cracks on the ceramic shell 201 that are invisible to the naked eye from affecting the normal operation of the internal resistance wire 203.

[0046] The first motor 301 is started, and the first motor 301 drives the first gear 302 to rotate, and the first gear 302 meshes with the first gear ring 304 to rotate, and the first gear ring 304 drives the turntable 303 to rotate. When the turntable 303 rotates, different samples are switched to be tested under high humidity environment and mechanical stress. When the first motor 301 stops rotating, the microprocessor in the processing unit 13 controls the power supply unit 10 to supply power to the resistance wire 203. The temperature probe 14 records the temperature change of the resistance wire 203, outputs it in the form of an electrical signal, and finally converts the electrical signal into a digital value and sends it to the processing unit 13 for storage. Under the control of the processing unit 13, the first motor 301 is driven to drive the turntable 303 to rotate to realize the testing of multiple samples in sequence, without the need to manually replace the samples, saving labor costs.

[0047] Comparison results: Compare the temperature change of the temperature probe 14 in the first test and the temperature change of the temperature probe 14 in the second test of the same sample to determine whether the bathroom heating device thermal element 2 meets the factory standard. Since the ceramic material is relatively brittle, once a crack is formed, it will quickly propagate along the stress concentration area after being subjected to force. If the mechanical stress added to the ceramic shell 201 during the second test causes the gap on the ceramic shell 201 that cannot be seen by the naked eye to expand, water vapor will enter the interior of the ceramic shell 201 and affect the normal operation of the resistance wire 203. Therefore, the temperature change monitored by the temperature probe 14 during the second test will be different from the temperature change during the first test. If the gap on the ceramic shell 201 is not found, water vapor will penetrate into the gap. The thermal expansion and contraction generated when the temperature changes in the bathroom will further expand the cracks in the ceramic shell 201, and the water vapor will invade the interior of the ceramic shell 201, affecting the normal operation of the resistance wire 203.

[0048] In actual use, by setting the first test and the second test steps, it can be known whether the bathroom heating device thermal element 2 meets the factory standards. This avoids the problem that after the bathroom heating device thermal element 2 is installed in the heating device, the gap of the ceramic shell 201 increases due to the large temperature difference and high humidity environment in the bathroom, thereby affecting the normal operation of the resistance wire 203 inside the bathroom heating device thermal element 2. By comparing the temperature change of the temperature probe 14 of the same sample during the first test and the temperature change of the temperature probe 14 during the second test, the user can intuitively determine whether the resistance wire 203 and the ceramic shell 201 outside the resistance wire 203 meet the standards, which is convenient for the user to operate. The second test step needs to be performed twice in order to test both sides of the ceramic shell 201, thereby improving the accuracy of the test results.

[0049] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal element (2) for a bathroom heating device, characterized in that: The invention comprises a ceramic shell (201), a connection port (207), a resistance wire (203), a frame (208), a sealing ring (206), a back plate (204) and a connection terminal (205); the ceramic shell (201) is connected to the connection port (207), the connection port (207) is fitted to the frame (208), the frame (208) is connected to the back plate (204), the frame (208) is connected to the sealing ring (206), the back plate (204) is connected to the connection terminal (205), and the connection terminal (205) is connected to the resistance wire (203).

2. A bathroom heating device thermal element according to claim 1, characterized in that: It also comprises a plurality of recessed cavities (202); the plurality of recessed cavities (202) are arranged on the ceramic shell (201).

3. A bathroom heating device thermal element performance testing device, used for testing the bathroom heating device thermal element (2) as claimed in any one of claims 1 to 2, characterized in that: The device comprises a housing (1), a temperature probe (14), a processing unit (13), a plurality of positioning mechanisms (4), a first test unit (5) and a second test unit (8), a switching mechanism (3) and a power supply unit (10); the power supply unit (10) is connected to the bathroom heating device thermal element (2); the plurality of positioning mechanisms (4) are arranged on the switching mechanism (3); and the plurality of positioning mechanisms (4) are used to fix the power supply unit (10) and the bathroom heating device thermal element (2); The switching mechanism (3) comprises a first motor (301), a first gear (302), a rotating disk (303), a first gear ring (304), a partition (305), a plurality of circular holes (306) and a bracket (307); The output end of the first motor (301) is connected to the first gear (302), the first gear (302) is meshed with a first gear ring (304) connected to the rotating disk (303), the rotating disk (303) is connected to the partition (305), a plurality of circular holes (306) are provided on the rotating disk (303), and the rotating disk (303) is slidably connected to the bracket (307).

4. A bathroom heating equipment thermal element performance testing device according to claim 3, characterized in that: The positioning mechanism (4) comprises a clamping plate (401), a friction rod (402) and a heat insulation pad (403); The friction rod (402) is connected to the rotating disk (303), the friction rod (402) is slidably connected to the clamping plate (401), and the clamping plate (401) is connected to the heat insulation pad (403).

5. A bathroom heating equipment thermal element performance testing device according to claim 3, characterized in that: The interior of the housing (1) is connected to a partition (11), the partition (11) is connected to an arc-shaped plate (12), and the first test unit (5) comprises a water tank (501), a liquid outlet pipe (502), a first one-way valve (503), an atomizing nozzle (504), an exhaust valve (505), an air inlet pipe (506) and a second one-way valve (507); The water tank (501) is connected to the liquid outlet pipe (502), the liquid outlet pipe (502) is connected to the first one-way valve (503), the liquid outlet pipe (502) is connected to the atomizing nozzle (504), the water tank (501) is connected to the exhaust valve (505), the water tank (501) is connected to the air intake pipe (506), and the air intake pipe (506) is connected to the second one-way valve (507).

6. A bathroom heating equipment thermal element performance testing device according to claim 5, characterized in that: The second test unit (8) comprises a contact rod (801), a frame (802), a torsion spring (803), a telescopic cylinder (804) and a screw (805); The frame (802) is rotatably connected to the contact rod (801), a torsion spring (803) is installed between the frame (802) and the contact rod (801), the contact rod (801) is slidably connected to the telescopic cylinder (804), and the screw (805) is used to fix the contact rod (801) and the telescopic cylinder (804).

7. A bathroom heating equipment thermal element performance testing device according to claim 6, characterized in that: The housing (1) is provided with a linkage mechanism (9); The linkage mechanism (9) comprises a second motor (908), a cam (906), a round wheel (907), a contact plate (901), a limit rod (904), a bump (910), a piston (902), a cylinder (909), a third one-way valve (903) and a compression spring (905); The output end of the second motor (908) passes through the housing (1) and is connected to the cam (906); the cam (906) is rotationally connected to the round wheel (907); the contact plate (901) is connected to the piston (902); the piston (902) is slidingly connected to the cylinder (909); the cylinder (909) is connected to the third one-way valve (903); the air intake pipe (506) is connected to the cylinder (909); the contact plate (901) is connected to the limit rod (904); the limit rod (904) passes through the protrusion (910); and a compression spring (905) is connected between the contact plate (901) and the protrusion (910).

8. The bathroom heating equipment thermal element performance testing equipment according to claim 3, characterized in that: The housing (1) is provided with an auxiliary mechanism (6); The auxiliary mechanism (6) comprises a first housing (601), a fan (602), a second housing (603), a refrigeration device (604), a ring pipe (605) and a circulation pump (606); The first shell (601) is connected to the housing (1), the first shell (601) is connected to the fan (602), the annular tube (605) is arranged inside the first shell (601), one end of the annular tube (605) passes through the first shell (601) and the second shell (603) and extends to the inside of the second shell (603), the other end of the annular tube (605) is connected to the circulation pump (606), the input end of the circulation pump (606) passes through the second shell (603), and the second shell (603) is connected to the refrigeration device (604).

9. A bathroom heating equipment thermal element performance testing device according to claim 8, characterized in that: A sealing mechanism (7) is provided inside the housing (1); The sealing mechanism (7) comprises a water baffle (701), a movable baffle (702), a slider (704), a slide rail (703), a rack (705), a second gear (706), a shaft (707), a contact switch (708), a third gear (709) and a second gear ring (710); The water baffle (701) is connected to the shell (1), and the water baffle (701) is used to shield the first shell (601). The water baffle (701) is fitted with the movable baffle (702), and the movable baffle (702) is connected to the slider (704), and the slider (704) is slidably connected to the slide rail (703). The movable baffle (702) is connected to the rack (705), and the rack (705) is meshedly connected to the second gear (706), and the second gear (706) is connected to the shaft (707), and the shaft (707) is rotatably connected to the shell (1), and the shaft (707) is connected to the third gear (709), and the third gear (709) is meshed with the second gear ring (710) connected to the rotating disk (303), and the contact switch (708) is connected to the shell (1).

10. A method for testing the performance of thermal elements of bathroom heating equipment, characterized in that: The implementation of the method relies on the bathroom heating equipment thermal element performance testing equipment described in any one of claims 3 to 9, and includes the following steps: Connecting the sample to be tested: sealingly connecting the connection terminal (205) on the thermal element (2) of the bathroom heating device to the power supply unit (10); Fixing the sample to be tested: using a positioning mechanism (4) to fix the power supply unit (10) and the bathroom heating device thermal element (2) on the turntable (303); Conduct a first test: unscrew the screw (805), pull the telescopic cylinder (804) upward, screw in the screw (805) to position the telescopic cylinder (804), start the second motor (908), the second motor (908) drives the round wheel (907) on the cam (906) to contact the contact plate (901), the contact plate (901) drives the piston (902) to move, the piston (902) moves to inject air in the cylinder (909) into the water tank (501), the pressure in the water tank (501) increases, the water and air in the water tank (501) are sprayed out from the atomizing nozzle (504), a high humidity environment is formed in the housing (1), the power supply unit (10) supplies power to the resistance wire (203) in the thermal element (2) of the bathroom heating device, the resistance wire (203) heats up, and the temperature probe (14) monitors and records the temperature change of the resistance wire (203); The first motor (301) is started, the first motor (301) drives the first gear (302) to rotate, the first gear (302) meshes with the first gear ring (304) to rotate, the first gear ring (304) drives the rotating disk (303) to rotate, and the rotating disk (303) switches different samples to be tested in a high humidity environment when rotating; The second test is performed by unscrewing the screw (805), pulling the telescopic cylinder (804) downward, screwing in the screw (805) to position the telescopic cylinder (804), starting the second motor (908), the second motor (908) drives the round wheel (907) on the cam (906) to contact the contact plate (901), the contact plate (901) drives the piston (902) to move, the piston (902) moves to inject the air in the cylinder (909) into the water tank (501), and the water in the water tank (501) is sprayed from the atomized sprayer. The head (504) is ejected, and a high humidity environment is formed in the shell (1); at the same time, the round wheel (907) on the cam (906) contacts the telescopic cylinder (804), and the telescopic cylinder (804) drives the contact rod (801) to rotate, and the contact rod (801) applies mechanical stress to the ceramic shell (201), and the power supply unit (10) supplies power to the resistance wire (203) in the thermal element (2) of the bathroom heating device, and the resistance wire (203) heats up, and the temperature probe (14) monitors and records the temperature change of the resistance wire (203); The first motor (301) is started, the first motor (301) drives the first gear (302) to rotate, the first gear (302) meshes with the first gear ring (304) to rotate, the first gear ring (304) drives the rotating disk (303) to rotate, and the rotating disk (303) switches different samples to be tested under a high humidity environment and mechanical stress when rotating; Comparison results: By comparing the temperature change of the temperature probe (14) of the same sample during the first test and the temperature change of the temperature probe (14) during the second test, it is determined whether the bathroom heating device thermal element (2) meets the factory standard.

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