Corrosion-resistant long-term constant-temperature heating water bath

Abstract

The utility model relates to test equipment technical field, concretely relates to a kind of corrosion-resistant long-term constant-temperature heating water bath box. Including preheating water tank and water bath box, preheating water tank is connected with at least two water bath boxes by pipeline;The inside of preheating water tank and water bath box is provided with heating pipe, and the heating pipe is electrically connected with heater;The inner wall of preheating water tank and water bath box is equipped with anticorrosive layer, and the outer wall is equipped with insulating layer;Preheating water tank top is provided with sealing cover, and preheating water tank upper portion is communicated with water inlet pipe, and water inlet pipe one end is inserted into preheating water tank and is connected with float ball valve;The inside of water bath box is fixedly provided with test piece support plate, and water bath box outside is provided with support frame, and the liquid level sensor and temperature sensor located in the inside of water bath box are fixedly provided on the support frame. The utility model can effectively improve its corrosion resistance by increasing corrosion-resistant layer;Meanwhile, the water supplied to water bath box is preheated, to avoid the water supplied to destroy the high-temperature water environment in water bath box.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a corrosion-resistant, long-term constant-temperature heating water bath. Background Technology

[0002] The high-temperature anomaly distribution area in the Southwest Plateau is quite extensive, and it is also a region where saline soils are widely distributed. The saline soils in the Southwest region are mainly sulfate and chloride-sulfate saline soils. During tunnel construction, water leakage in high-temperature tunnels is common, and tunnel insulation materials and concrete materials are easily affected by groundwater and the salt content in the water. Therefore, it is necessary to use a water bath to test tunnel insulation materials and concrete materials to detect the impact of high-temperature saline water on these materials.

[0003] However, existing water baths are typically made of 201 or 304 stainless steel, which can effectively resist corrosion from water vapor, water, and some acidic solutions. But if placed in high-temperature acid, alkali, or salt solutions, the corrosion of stainless steel will be accelerated. Water baths have insufficient corrosion resistance and cannot provide a high-temperature salt water environment for a long time. At the same time, existing water baths usually use direct connection to a faucet or add a water tank to achieve the purpose of water replenishment. Since the water supplied to the water bath is room temperature water, it is easy to disrupt the high-temperature water environment in the water bath, thereby reducing the accuracy of the test results. Summary of the Invention

[0004] This invention addresses the problems of insufficient corrosion resistance and easy disruption of the high-temperature water environment inside water baths caused by water replenishment in existing technologies. It provides a corrosion-resistant, long-term constant-temperature heating water bath. This water bath effectively improves its corrosion resistance by adding a corrosion-resistant layer, ensuring a long-term supply of a high-temperature brine environment. Simultaneously, the water added to the water bath is preheated to increase its temperature, preventing disruption of the high-temperature water environment and improving the accuracy of test results.

[0005] To achieve the above objectives, the technical solution of this utility model is: a corrosion-resistant, long-term constant-temperature heating water bath, comprising a preheating water tank and a water bath, wherein the preheating water tank is connected to at least two water baths via pipes; both the preheating water tank and the water bath are equipped with heating pipes, which are electrically connected to heaters; both the inner walls of the preheating water tank and the water bath are provided with anti-corrosion layers, and the outer walls are provided with insulation layers. Water in the preheating water tank can be transported to the water bath via pipes, and the heating pipes in the preheating water tank preheat the water inside to prevent the water added to the water bath from disrupting the high-temperature water environment in the water bath; the heating pipes in the water bath heat the water inside, allowing the water in the water bath to maintain a constant temperature for a long time, avoiding the impact of excessively low water temperature on the accuracy of test results; the anti-corrosion layer improves the corrosion resistance of both the preheating water tank and the water bath.

[0006] The preheating water tank is equipped with a cover on top, and an inlet pipe is connected to the upper part of the tank. One end of the inlet pipe extends into the preheating water tank and is connected to a float valve. The cover seals the preheating water tank, allowing water to be added to the tank through the inlet pipe. The float valve also allows for automatic water replenishment; when the water level in the preheating water tank falls below the float valve level, cold water is automatically added.

[0007] The water bath contains a specimen support plate fixedly installed inside, and a support frame is installed on the outside of the water bath. A liquid level sensor and a temperature sensor, both located inside the water bath, are fixedly mounted on the support frame. A liquid level controller and a remote temperature recorder are also installed on the outside of the water bath, with the liquid level controller electrically connected to the liquid level sensor. The specimen support plate is used to hold the specimen to be tested, enabling high-temperature water bath testing. The hydraulic sensor detects the liquid level in the water bath, and the temperature sensor detects the temperature of the high-temperature water inside the water bath.

[0008] Furthermore, a base is provided at the bottom of the preheating water tank, and a first handle is provided at the center of the top of the cover; an observation hole is also provided on the cover, and an observation cover is rotatably installed at the observation hole, with a second handle on the top of the observation cover. The base supports the preheating water tank, and the hydraulic pressure inside the preheating water tank can be observed through the observation hole after opening the observation cover.

[0009] Furthermore, the lower part of the preheating water tank is connected to a water outlet pipe, and a water outlet valve located outside the preheating water tank is installed on the water outlet pipe. Water in the preheating water tank is transported to the water bath tank through the water outlet pipe, and the water outlet valve serves to open and close the water outlet pipe.

[0010] Furthermore, the outlet pipe is connected to a branch pipe, which in turn is connected to at least two branch pipes. These branch pipes are connected to the upper part of the water bath tank, and each branch pipe is equipped with a solenoid valve. The solenoid valve is connected to the level controller via a wire. Water from the preheating tank is discharged through the outlet pipe and then sequentially transported to the bath tank via the branch pipes. The level controller controls the opening and closing of the branch pipes by the solenoid valves.

[0011] Furthermore, the specimen support plate is located above the heating tube, and several strip-shaped holes are evenly spaced on the specimen support plate. These strip-shaped holes allow water in the water bath to pass through the specimen support plate, ensuring that the heating tube can heat the water in the water bath, thereby maintaining a constant temperature in the water bath for a long period.

[0012] Furthermore, a lid is rotatably connected to the top of the water bath tank, and a third handle is symmetrically arranged on the top of the lid. The lid has a through hole, a square hole, and an opening, with the square hole and the opening communicating with each other. The square hole, through hole, and opening facilitate the installation of a liquid level sensor and a temperature sensor.

[0013] Furthermore, the support frame includes a base plate and a bracket disposed on top of the base plate. The bracket is hollow and has an "L"-shaped structure. A vertical plate is vertically disposed at the bottom of the horizontal part of the bracket, and a fiberglass plate is disposed on the outside of the vertical plate to cover the square hole. The vertical plate is used to install a liquid level sensor, and the fiberglass plate and the square hole facilitate observation of the liquid level inside the water bath.

[0014] Furthermore, the lower end of the vertical plate passes through the opening and extends into the water bath. The liquid level sensor is fixedly installed at the lower part of the vertical plate. The liquid level sensor includes an upper liquid level sensor and a lower liquid level sensor, with the upper liquid level sensor located above the lower liquid level sensor. Both the upper and lower liquid level sensors are connected to the liquid level controller via wires. Both the upper and lower liquid level sensors detect the liquid level inside the water bath. When the upper liquid level sensor detects a liquid level, water is automatically added to the water bath. When the lower liquid level sensor detects a liquid level, the heating element stops heating.

[0015] Furthermore, a vertical plate is fixedly installed at the end of the horizontal part of the bracket, and an L-shaped plate is installed on the outer side of the vertical plate. The temperature sensor is installed on the horizontal part of the L-shaped plate, and the temperature measuring end of the temperature sensor passes downward through the through hole and extends into the interior of the water bath. The temperature sensor detects the temperature of the high-temperature water in the water bath. The remote temperature recorder records and analyzes the temperature detected by the temperature sensor, and an alarm is triggered when the temperature exceeds the preset value.

[0016] The beneficial effects of this utility model through the above technical solution are as follows: This invention improves the corrosion resistance of the preheating tank and water bath by adding a corrosion-resistant layer to the inner wall of the preheating tank and water bath, thus preventing the tank from being corroded by high-temperature acid, alkali, or salt solutions and ensuring the long-term supply of a high-temperature brine environment. In addition, the outer walls of the preheating tank and water bath are equipped with insulation layers, which keep the high-temperature water in the tanks warm and prevent it from losing heat too quickly.

[0017] The heating tube in the preheating water tank of this invention preheats the water inside and delivers the preheated water to the water bath through pipes. This can disrupt the high-temperature water environment in the water bath by adding water to it. The heating tube in the water bath heats the water inside, which can keep the water in the water bath at a constant temperature for a long time, thus improving the accuracy of the test results of the specimen.

[0018] This invention utilizes a float valve to automatically replenish water to the preheating water tank via the inlet pipe. Since water is automatically replenished when the liquid level in the preheating water tank drops below the float valve, the effect of the cold water added to the preheating water tank on its internal water temperature is negligible. In addition, when the upper liquid level sensor detects the liquid level in the water bath, the liquid level controller controls the solenoid valve to open and automatically replenish water to the water bath through the branch pipe, achieving fully automatic high-temperature water replenishment.

[0019] After the liquid level sensor of this invention detects the liquid level in the water bath, it can shut off the heating tube through the heater to stop heating the water in the water bath, thus preventing the water in the water bath from boiling dry and improving safety. At the same time, the temperature sensor detects the temperature of the high-temperature water in the water bath and realizes remote monitoring and over-temperature alarm through remote temperature measurement and recording, thereby improving safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a corrosion-resistant, long-term constant-temperature heating water bath according to this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a corrosion-resistant, long-term constant-temperature heating water bath according to this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the preheating water tank of this utility model; Figure 4 This is a schematic diagram of the internal structure of the preheating water tank of this utility model; Figure 5 This is a schematic diagram of the structure of the cap of this utility model; Figure 6 This is a schematic diagram of the structure of the water bath tank of this utility model. Figure 1 ; Figure 7 This is a schematic diagram of the structure of the water bath tank of this utility model. Figure 2 ; Figure 8 This is a schematic diagram of the structure of the water bath tank of this utility model. Figure 3 (Excluding the lid); Figure 9 This is a schematic diagram of the internal structure of the water bath tank of this utility model; Figure 10 This is a schematic diagram of the structure of the monitoring component of this utility model; Figure 11 This is a schematic diagram of the structure of the box cover of this utility model; Figure 12 This is a schematic diagram of the structure of the specimen support plate of this utility model; The attached diagram is labeled as follows: 1 is the base, 2 is the preheating water tank, 3 is the inlet pipe, 4 is the float valve, 5 is the outlet pipe, 6 is the outlet valve, 7 is the cover, 701 is the first handle, 8 is the observation cover, 801 is the second handle, 9 is the water bath, 10 is the diversion pipe, 11 is the diversion branch pipe, 1101 is the solenoid valve, 12 is the heating pipe, 13 is the heater, 14 is the specimen support plate, 1401 is the strip hole, 15 is the box cover, 1501 is the third handle, 1502 is the through hole, 1503 is the square hole, 1504 is the opening, 16 is the base plate, 17 is the bracket, 18 is the vertical plate, 19 is the fiberglass board, 20 is the upper liquid level sensor, 21 is the lower liquid level sensor, 22 is the L-shaped plate, 23 is the temperature sensor, 24 is the liquid level controller, and 25 is the remote temperature measurement recorder. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1-12 As shown, a corrosion-resistant, long-term constant-temperature heating water bath includes a preheating water tank 2 and a water bath tank 9. The preheating water tank 2 is connected to at least two water bath tanks 9 via pipes. Heating tubes 12 are installed inside both the preheating water tank 2 and the water bath tank 9, and the heating tubes 12 are electrically connected to heaters 13. The inner walls of both the preheating water tank 2 and the water bath tank 9 are provided with an anti-corrosion layer, and the outer walls are provided with an insulation layer. In this embodiment, the preheating water tank 2 is connected to two water bath tanks 9 via pipes. In specific implementations, the number of water bath tanks 9 can be increased according to actual working conditions. Both the preheating water tank 2 and the water bath tank 9 are made of 304 stainless steel. The heating tubes 12 can heat the water in the preheating water tank 2 and the water bath tank 9. The heaters 13 can control the water heating temperature of the heating tubes 12 via a knob. The heaters 13 have their own leakage protection devices. The heating tubes 12 are Shuohang Electric Heating M-type Teflon heating tubes.

[0022] Specifically, the heating tube 12 in the preheating water tank 2 preheats the water inside it. The water in the preheating water tank 2 is transported to the water bath 9 through a pipeline. Adding preheated water to the water bath 9 can avoid disrupting the high-temperature water environment in the water bath 9 and improve the accuracy of the test results of the specimen. The heating tube 12 in the water bath 9 heats the water inside it, which can keep the water in the water bath 8 at a constant temperature for a long time.

[0023] The purpose of the anti-corrosion layer is to ensure that the preheating water tank 2 and the water bath tank 9 are not corroded by the aqueous solution. The anti-corrosion layer is made of polytetrafluoroethylene (PTFE), which is sprayed onto the inner wall of the preheating water tank 2 and the water bath tank 9 to form an anti-corrosion protective layer that can withstand long-term heating of solutions such as sodium chloride, nitrate, sodium hydroxide, and organic solutions. In addition, the insulation layer is made of fireproof and heat-insulating cotton.

[0024] The preheating water tank 2 is equipped with a cover 7 on its top, and an inlet pipe 3 is connected to the upper part of the preheating water tank 2. One end of the inlet pipe 3 extends into the preheating water tank 2 and is connected to a float valve 4. In this embodiment, the cover 7 and the inlet pipe 3 are also made of 304 stainless steel. Cold water can be added to the preheating water tank 2 through the inlet pipe 3. The inlet pipe 3 is directly connected to a faucet. Through the action of the float valve 4, the inlet pipe 3 can automatically add water to the preheating water tank 2. Since the liquid level in the preheating water tank 2 will be automatically replenished when it is lower than the float valve 4, the effect of the cold water added to the preheating water tank 2 on its internal water temperature is negligible, thus achieving the effect of automatic water replenishment.

[0025] The water bath 9 has a specimen support plate 14 fixedly installed inside, and a support frame is installed on the outside of the water bath 9. A liquid level sensor and a temperature sensor 23 located inside the water bath 9 are fixedly installed on the support frame. A liquid level controller 24 and a remote temperature recorder 25 are installed on the outside of the water bath 9. The liquid level controller 24 is electrically connected to the liquid level sensor. In this embodiment, both the specimen support plate 14 and the support frame are made of 304 stainless steel, and the specimen support plate 14 is also coated with polytetrafluoroethylene. The specimen support plate 14 is used to place the specimen to be tested so that the specimen can be tested in the water bath 9. The liquid level sensor 24 is a PTFE corrosion-resistant liquid level transmitter produced by Xinkong. The liquid level sensor 24 is used to detect the liquid level inside the water bath 9. The temperature sensor 23 is used to detect the temperature of the high-temperature water inside the water bath 9. The remote temperature measurement recorder 25 records and analyzes the temperature detected by the temperature sensor 23, and can realize remote monitoring and over-temperature alarm. The remote temperature measurement recorder 25 is a Jingchuang alog300a remote temperature measurement recorder.

[0026] The preheating water tank 2 has a base 1 at its bottom, and a first handle 701 is located at the center of the top of the cover 7. The cover 7 also has an observation hole, and an observation cover 8 is rotatably mounted at the observation hole. A second handle 801 is located on the top of the observation cover 8. In this embodiment, the base 1 supports the preheating water tank 2, the first handle 701 facilitates the user to open the cover 7, the observation cover 8 is rotatably connected to the cover 7 via a hinge, and the second handle 801 facilitates the user to open the observation cover 8 and observe the liquid level in the preheating water tank 2 through the observation hole. Both the first handle 701 and the second handle 801 are wrapped with fireproof and heat-insulating cotton. The top of the cover 7 has a pipe hole for the heating pipe 12 to pass through, with one end of the heating pipe 12 passing through the pipe hole and connected to the heater 13 at the top of the cover 7.

[0027] The preheating water tank 2 is connected to a water outlet pipe 5 at its lower part, and a water outlet valve 6 located outside the preheating water tank 2 is installed on the water outlet pipe 5. In this embodiment, the preheating water tank 2 replenishes water to the water bath tank 9 through the water outlet pipe 5, and the water outlet valve 6 controls the opening and closing of the water outlet pipe 5. When the test specimen is being tested, the water outlet valve 6 is in the normally open state.

[0028] The outlet pipe 5 is connected to a branch pipe 10, which is connected to at least two branch pipes 11. The branch pipes 11 are connected to the upper part of the water bath 9. A solenoid valve 1101 is installed on each branch pipe 11, and the solenoid valve 1101 is connected to the level controller 24 via a wire. In this embodiment, water in the preheating tank 2 is transported to the branch pipe 10 via the outlet pipe 5, and then to the water bath 9 via the branch pipes 11 to replenish the water bath 9. The level controller 24 can control the solenoid valve 1101 to open and close the branch pipes 11, thus controlling whether to replenish water into the water bath 9.

[0029] The specimen support plate 14 is located above the heating tube 12, and a plurality of strip-shaped holes 1401 are equally spaced on the specimen support plate 14. In this embodiment, when the specimen is tested, it is placed on top of the specimen support plate 14, which serves to support the specimen. The specimen support plate 14 has three strip-shaped holes 1401, which allow water in the water bath 9 to pass through the specimen support plate 14, so that the heating tube 12 can heat the water inside.

[0030] The top of the water bath 9 is rotatably connected to a cover 15. A third handle 1501 is symmetrically arranged on the top of the cover 15. The cover 15 has a through hole 1502, a square hole 1503, and an opening 1504, with the square hole 1503 and the opening 1504 communicating with each other. In this embodiment, the top of the water bath 9 has a pipe hole for the heating pipe 12 to pass through. One end of the heating pipe 12 passes through the pipe hole and connects to the heater 13 on the top of the water bath 9. The cover 15 is rotatably connected to the top plate of the water bath 9 via a hinge. There are two third handles 1501 on the top of the cover 15, and each third handle 1501 is also wrapped with fireproof and heat-insulating cotton. The through hole 1502, the square hole 1503, and the opening 1504 facilitate the placement of the liquid level sensor and the temperature sensor 23 inside the water bath 9.

[0031] The support frame includes a base plate 16 and a bracket 17 disposed on top of the base plate 16. The bracket 17 is hollow and has an "L"-shaped structure. A vertical plate 18 is vertically disposed at the bottom of the horizontal part of the bracket 17, and a fiberglass plate 19 is disposed on the outside of the vertical plate 18 to cover the square hole 1503. In this embodiment, both the base plate 16 and the bracket 17 are made of 304 stainless steel. The vertical plate 18 provides an installation position for the liquid level sensor, so that the liquid level sensor can be placed inside the water bath 9. The vertical plate 18 is made of fiberglass material, and the fiberglass plate 19 and the square hole 1503 facilitate the observation of the liquid level inside the water bath 9. The bracket 17 has a hollow structure inside, serving as a channel for the liquid level sensor wires.

[0032] The lower end of the vertical plate 18 passes through the opening 1504 and extends into the water bath 9. The liquid level sensor is fixedly installed at the lower part of the vertical plate 18. The liquid level sensor includes an upper liquid level sensor 20 and a lower liquid level sensor 21. The upper liquid level sensor 20 is located above the lower liquid level sensor 21. Both the upper liquid level sensor 20 and the lower liquid level sensor 21 are connected to the liquid level controller 24 via wires. In this embodiment, both the upper liquid level sensor 20 and the lower liquid level sensor 21 are bonded and fixed to the vertical plate 18 with polytetrafluoroethylene adhesive. In addition, the heating tube 12, the temperature sensor 23, and the liquid level sensor wires are all made of Teflon.

[0033] In practice, when the upper liquid level sensor 20 detects the liquid level inside the water bath 9, it sends feedback to the liquid level controller 24. The liquid level controller 24 controls the solenoid valve 1101 to open, and water is added to the water bath 9 through the branch pipe 11. Then, when the lower liquid level sensor 21 detects the liquid level inside the water bath 9, the heating tube 12 is turned off through the heater 13, stopping the heating tube 12 from heating the water inside the water bath 9, so as to prevent the heating tube 12 from drying out the water inside the water bath 9.

[0034] A vertical plate is fixedly installed at the horizontal end of the support 17. An L-shaped plate 22 is installed on the outer side of the vertical plate. The temperature sensor 23 is installed at the horizontal part of the L-shaped plate 22. The temperature measuring end of the temperature sensor 23 passes downward through the through hole 1502 and extends into the interior of the water bath 9. In this embodiment, both the vertical plate and the L-shaped plate 22 are made of fiberglass. The temperature sensor 23 detects the temperature of the high-temperature water inside the water bath 9. The remote temperature recorder 25 records and analyzes the temperature detected by the temperature sensor 23, and can realize remote monitoring and over-temperature alarm.

[0035] The working principle of this utility model is as follows: First, open the box cover 15 through the third handle 1501, place the test specimen to be tested on the specimen support plate 14, and close the box cover 15 after the test specimen is placed. Then, place the temperature sensor 23, the upper liquid level sensor 20 and the lower liquid level sensor 21 in the water bath 9 through the through hole 1502, the square hole 1503 and the opening 1504 respectively. Salt water is introduced into the water bath 9 and tap water is introduced into the preheating water tank 2. The heating tubes 12 inside the two heat the salt water and the tap water respectively, forming a high-temperature salt water environment required for the test in the water bath 9. The water in the preheating water tank 2 is preheated to replenish the water in the water bath 9.

[0036] When the upper liquid level sensor 20 detects the liquid level inside the water bath 9, it sends feedback to the liquid level controller 24. The liquid level controller 24 controls the solenoid valve 1101 to open, and the preheated water in the preheated water tank 2 is discharged through the outlet pipe 5 and transported to the diversion pipe 10, and then transported to the water bath 9 through the diversion branch pipe 11 to replenish the water bath 9. When the liquid level in the water bath 9 reaches the appropriate position, the liquid level controller 24 controls the solenoid valve 1101 to close. During this process, if the liquid level in the preheated water tank 2 is lower than the float valve 4, water will be automatically replenished through the inlet pipe 3. In addition, during the water bath test of the specimen, the temperature sensor 23 detects the temperature of the high-temperature water inside the water bath 9, and the remote temperature recorder 25 records and analyzes the temperature detected by the temperature sensor 23. In conjunction with the heating tube 12 inside the water bath 9, a high-temperature brine environment can be provided for a long time. When the temperature sensor 23 detects that the high-temperature water temperature exceeds the set range, the remote temperature recorder 25 will trigger an over-temperature alarm.

[0037] The embodiments described above are merely preferred embodiments of the utility model and are not intended to limit the scope of the utility model. Therefore, all equivalent changes or modifications made to the technical solutions described in the scope of the utility model patent application should be included within the scope of the utility model patent application.

Claims

1. A corrosion-resistant, long-term constant-temperature heating water bath, characterized in that, It includes a preheating water tank (2) and a water bath tank (9). The preheating water tank (2) is connected to at least two water bath tanks (9) through pipes. The interior of both the preheating water tank (2) and the water bath tank (9) is equipped with heating pipes (12), and the heating pipes (12) are electrically connected to heaters (13). The inner walls of both the preheating water tank (2) and the water bath tank (9) are provided with anti-corrosion layers, and the outer walls are provided with heat insulation layers. The preheating water tank (2) is provided with a cover (7) on the top. The upper part of the preheating water tank (2) is connected to a water inlet pipe (3). One end of the water inlet pipe (3) extends into the preheating water tank (2) and is connected to a float valve (4). The water bath (9) is fixedly equipped with a specimen support plate (14) inside, and a support frame is provided on the outside of the water bath (9). A liquid level sensor and a temperature sensor (23) located inside the water bath (9) are fixedly installed on the support frame. A liquid level controller (24) and a remote temperature recorder (25) are provided on the outside of the water bath (9). The liquid level controller (24) is electrically connected to the liquid level sensor.

2. The corrosion-resistant, long-term constant-temperature heating water bath according to claim 1, characterized in that, The bottom of the preheated water tank (2) is provided with a base (1), and the top middle position of the cover (7) is provided with a first handle (701); the cover (7) is also provided with an observation hole, and an observation cover (8) is rotatably provided at the observation hole, and a second handle (801) is provided on the top of the observation cover (8).

3. The corrosion-resistant, long-term constant-temperature heating water bath according to claim 1, characterized in that, The lower part of the preheating water tank (2) is connected to a water outlet pipe (5), and a water outlet valve (6) located outside the preheating water tank (2) is provided on the water outlet pipe (5).

4. The corrosion-resistant, long-term constant-temperature heating water bath according to claim 3, characterized in that, The outlet pipe (5) is connected to a diversion pipe (10), and the diversion pipe (10) is connected to at least two diversion branches (11). The diversion branches (11) are connected to the upper part of the water bath (9). A solenoid valve (1101) is installed on the diversion branch (11), and the solenoid valve (1101) is connected to the liquid level controller (24) through a wire.

5. A corrosion-resistant, long-term constant-temperature heating water bath according to claim 1, characterized in that, The specimen support plate (14) is located above the heating tube (12), and a number of strip holes (1401) are equally spaced on the specimen support plate (14).

6. A corrosion-resistant, long-term constant-temperature heating water bath according to claim 1, characterized in that, The top of the water bath tank (9) is rotatably connected to a lid (15). A third handle (1501) is symmetrically arranged on the top of the lid (15). The lid (15) has a through hole (1502), a square hole (1503) and an opening (1504). The square hole (1503) and the opening (1504) are connected.

7. A corrosion-resistant, long-term constant-temperature heating water bath according to claim 6, characterized in that, The support frame includes a base plate (16) and a bracket (17) set on the top of the base plate (16). The bracket (17) is hollow inside and has an "L" shaped structure. A vertical plate (18) is vertically set at the bottom of the horizontal part of the bracket (17). A fiberglass board (19) for covering the square hole (1503) is set on the outside of the vertical plate (18).

8. A corrosion-resistant, long-term constant-temperature heating water bath according to claim 7, characterized in that, The lower end of the vertical plate (18) passes through the opening (1504) and extends into the water bath (9); the liquid level sensor is fixedly installed at the lower part of the vertical plate (18), and the liquid level sensor includes an upper liquid level sensor (20) and a lower liquid level sensor (21). The upper liquid level sensor (20) is located above the lower liquid level sensor (21). The upper liquid level sensor (20) and the lower liquid level sensor (21) are both connected to the liquid level controller (24) through wires.

9. A corrosion-resistant, long-term constant-temperature heating water bath according to claim 7, characterized in that, A vertical plate is fixedly installed at the end of the horizontal part of the bracket (17), and an L-shaped plate (22) is installed on the outside of the vertical plate. The temperature sensor (23) is installed at the horizontal part of the L-shaped plate (22), and the temperature measuring end of the temperature sensor (23) passes downward through the through hole (1502) and extends into the interior of the water bath (9).

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