Laboratory Fume Hoods

Abstract

The present application relates to a laboratory fume hood, including a cabinet, a laboratory cavity is arranged on one side of the cabinet, a laboratory cavity is arranged on the side of the cabinet corresponding to the laboratory, the lower side of the cabinet corresponding to the laboratory cavity is a bottom plate, the upper side of the cabinet corresponding to the laboratory cavity is a top plate, both sides of the cabinet corresponding to the laboratory cavity are side plates, the rear surface of the cabinet corresponding to the laboratory cavity is a rear panel, a transparent baffle that can move vertically to close the laboratory cavity is arranged on the open side of the cabinet corresponding to the laboratory cavity, a cooling water channel that is interconnected is opened in the rear panel, the bottom plate, the top plate and the two side plates, a water storage tank is arranged on the upper side of the cabinet corresponding to the top plate, a main control pipe that connects the water inlet of the cooling water channel and the water storage tank is fixedly connected to the lower side of the water storage tank, a valve is fixedly connected to the main control pipe, and a circulating water tank that is connected to the water outlet of the cooling water channel is fixedly connected to the lower side of the cabinet. The present application has the effect of cooling the fume hood when the temperature in the fume hood is too high.

Description

Technical Field

[0001] The present application relates to the field of laboratory equipment, and in particular to a laboratory fume hood. Background Art

[0002] Fume hoods are an indispensable part of laboratory design. In order to prevent laboratory workers from inhaling some toxic, pathogenic or unknown toxic chemicals, the laboratory should have good ventilation. To avoid the absorption of some steam, gas and particles (smoke, soot, dust, etc.), pollutants must be removed by fume hoods, ventilation hoods or local ventilation.

[0003] The most important function of the fume hood is the exhaust function. In chemical laboratories, various harmful gases, odors, moisture, and flammable, explosive, and corrosive substances are produced during experimental operations. In order to protect the safety of users and prevent the pollutants in the experiment from spreading to the laboratory, fume hoods should be used near the pollution source.

[0004] With respect to the above-mentioned related technologies, the inventors believe that when heating substances or conducting certain organic chemical reaction experiments in a fume hood, open flames are often easily generated. If the overall temperature of the fume hood is high, it will cause damage to the internal components of the fume hood. In severe cases, it may even cause a fire, resulting in a safety accident. Summary of the invention

[0005] In order to cool down the fume hood when the temperature inside the fume hood is too high, the present application provides a laboratory fume hood.

[0006] The present application provides a laboratory fume hood, which adopts the following technical solution:

[0007] A laboratory fume hood comprises a cabinet body, wherein an experimental cavity is arranged on one side of the cabinet body, and an experimental cavity is arranged on a side of the cabinet body corresponding to the laboratory, the lower side of the cabinet body corresponding to the experimental cavity is a bottom plate, the upper side of the cabinet body corresponding to the experimental cavity is a top plate, both sides of the cabinet body corresponding to the experimental cavity are side plates, the rear surface of the cabinet body corresponding to the experimental cavity is a rear panel, and a transparent baffle plate capable of vertical movement to close the experimental cavity is arranged on the open side of the cabinet body corresponding to the experimental cavity, wherein the rear panel, the bottom plate, the top plate and the two side panels are all provided with cooling water channels interconnected with each other, a water storage tank is arranged on the upper side of the cabinet body corresponding to the top plate, a main control pipe connecting a water inlet of a cooling water channel and the water storage tank is fixedly connected to the lower side of the water storage tank, a valve is fixedly connected to the main control pipe, and a circulating water tank connected with a water outlet of a cooling water channel is fixedly connected to the lower side of the cabinet body.

[0008] By adopting the above technical solution, experiments can be carried out in the experimental chamber during use. When a fire occurs in the experimental chamber, the valve can be opened, and the water flow in the water tank can directly flow through the main control pipe 1 to the cooling water channel 1, thereby cooling the rear panel, bottom plate, top plate and two side plates of the experimental chamber through the cooling water channel 1. On the other hand, heat insulation is also achieved, reducing heat transfer to the interior of the fume hood, thereby protecting the internal equipment of the fume hood.

[0009] Optionally, a main control pipe 2 connecting the water tank and cooling water channel 1 is provided on the lower side of the water tank, a receiving pipe with a lower end extending to the lower side of the top plate is provided in the middle of the main control pipe 2, a temperature sensing box with a diameter larger than that of the receiving pipe is fixedly connected to the lower end of the receiving pipe, a wax column with an upper end extending into the main control pipe 2 and capable of closing the main control pipe 2 is fixedly connected in the receiving pipe, and the wax column extends into the temperature sensing box and abuts against the inner bottom surface of the temperature sensing box.

[0010] By adopting the above technical solution, when a fire occurs without the staff noticing, if valve one is not opened in time, the temperature in the experimental chamber will increase, which will also increase the temperature of the temperature sensing box, and then melt the wax column in the temperature sensing box and the receiving tube, and the melted wax column will flow into the temperature sensing box. At this time, the main control pipe two will also be connected, so that the water in the water tank will flow from the main control pipe two to the cooling water channel one, and then from the cooling water channel one to the circulating water tank, so as to cool the rear panel, bottom plate, top plate and two side plates of the experimental chamber, and insulate the internal components of the fume hood.

[0011] Optionally, a connecting pipe is fixedly connected to the lower end of the main control pipe 1 and the main control pipe 2, and the connecting pipe is connected to the water inlet of the circulating water pipe. A water distribution pipe is fixedly connected to the side of the connecting pipe close to the baffle, and a water receiving pipe is fixedly connected to one side of the circulating water tank. A cooling water channel 2 is opened in the baffle, and the water inlet of the cooling water channel 2 can be connected to the water distribution pipe when the baffle moves downward to abut the bottom plate, and the water outlet of the cooling water channel 2 can be connected to the connecting water pipe when the baffle moves downward to abut the bottom plate.

[0012] By adopting the above technical scheme, when the falling baffle is carried out for the experiment, as the baffle falls, the water inlet hole of the cooling water channel 2 in the baffle will be connected with the water distribution pipe, and the water outlet in the cooling water channel will be connected with the connecting water pipe, so that the water in the water tank can flow to the connecting pipe through the main control pipe 1 or the main control pipe 2, and then flow from the connecting pipe to the water distribution pipe, and then flow to the cooling water channel 2 in the baffle, and then flow from the cooling water channel 2 to the circulating water tank, thereby realizing the cooling and heat insulation of the baffle and further protecting the baffle.

[0013] Optionally, a water supply pipe is fixedly connected to the upper part of the water storage tank, a refrigerator is arranged in the circulating water tank, a circulating water pipe is connected between the circulating water tank and the water storage tank, and a circulating water pump is fixedly connected to the middle part of the circulating water pipe.

[0014] By adopting the above technical solution, when in use, the water in the water tank can be replenished through the water supply pipe connected to the external faucet to ensure that there is enough water in the water tank. In addition, when the water in cooling water channel 1 and cooling water channel 2 flows into the circulating water tank, the refrigerator can be turned on to cool the water in the circulating water tank, and then the water in the circulating water tank is sent back to the water tank through the action of the circulating water pump.

[0015] Optionally, the water distribution pipe is provided with a connecting sleeve that can slide along the axial direction of the water distribution pipe at one end close to the baffle, and the water distribution pipe sleeve is provided with a push spring that can push the connecting sleeve to move toward the baffle under normal conditions.

[0016] By adopting the above technical solution, the normal push spring can push the connecting sleeve to move toward the baffle, so that the connecting sleeve is tightly against the baffle. Then, when the baffle moves downward, the water outlet hole of the connecting sleeve can be connected to the water inlet hole of the baffle cooling water channel 2, so that water can flow into the cooling water channel 2 of the baffle.

[0017] Optionally, the end of the connecting sleeve away from the water distribution pipe is tapered, and the baffle is provided with a tapered positioning groove at a position corresponding to the second water inlet hole of the cooling water channel.

[0018] By adopting the above technical solution, the positioning groove and the tapered end of the connecting sleeve cooperate with each other, which can further improve the sealing between the connecting sleeve and the baffle.

[0019] Optionally, a stop valve is connected to the upper side of the receiving pipe corresponding to the main control pipe 2, and the receiving pipe is detachably connected to the main control pipe 2.

[0020] By adopting the above technical solution, when the wax column melts in the receiving tube and the temperature sensing box, the stop valve can be closed to close the main control pipe 2, and then the receiving tube can be removed from the main control pipe 2 to replace the new receiving tube, temperature sensing box and wax column for subsequent reuse.

[0021] Optionally, a limiting groove is provided on the lower side of the bottom plate or baffle, a sealing gasket is fixedly connected to the bottom surface of the limiting groove, and the upper end of the water receiving pipe extends to the position of the sealing gasket.

[0022] By adopting the above technical solution, the baffle moves downward, so that the lower side of the baffle moves into the limiting groove and abuts against the upper side of the sealing gasket, thereby making the lower side of the baffle abut against the sealing gasket.

[0023] Optionally, a push cylinder is fixedly connected to both sides of the cabinet corresponding to the baffle, and the telescopic rod of the push cylinder is arranged upward and fixedly connected to the baffle.

[0024] By adopting the above technical solution, when working, the push cylinder drives the telescopic rod to extend, which can drive the baffle to move downward, thereby driving the baffle to move downward, thereby achieving the closure of the experimental chamber.

[0025] Optionally, an inert gas fire extinguisher tank is arranged in the cabinet, an outlet pipe of the inert gas fire extinguisher tank is connected with the experimental chamber, and a control valve is arranged on the outlet pipe.

[0026] By adopting the above technical solution, after a fire occurs in the experimental chamber, the control valve can be opened, and the inert gas fire extinguishing tank can be used to pass inert gas into the experimental chamber to extinguish the fire.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. When in use, experiments can be carried out in the experimental chamber. When a fire occurs in the experimental chamber, the valve can be opened, and the water flow in the water tank can flow directly through the main control pipe to the cooling water channel, thereby cooling the rear panel, bottom plate, top plate and two side plates of the experimental chamber through the cooling water channel. On the other hand, heat insulation is also achieved to reduce the heat transfer to the inside of the fume hood and protect the internal equipment of the fume hood;

[0029] 2. When a fire breaks out without the staff noticing, if valve 1 is not opened in time, the temperature in the experimental chamber will rise, which will also increase the temperature of the temperature-sensing box, and then melt the wax column in the temperature-sensing box and the receiving tube. The melted wax column will flow into the temperature-sensing box. At this time, the main control pipe 2 will also be connected, so that the water in the water tank will flow from the main control pipe 2 to the cooling water channel 1, and then from the cooling water channel 1 to the circulating water tank, so as to cool the rear panel, bottom plate, top plate and two side plates of the experimental chamber, and insulate the internal components of the fume hood;

[0030] 3. When the falling baffle is tested, as the baffle falls, the water inlet of the cooling water channel 2 in the baffle will be connected with the water distribution pipe, and the water outlet in the cooling water channel will be connected with the connecting water pipe, so that the water in the water tank can flow to the connecting pipe through the main control pipe 1 or the main control pipe 2, and then flow from the connecting pipe to the water distribution pipe, and then flow to the cooling water channel 2 in the baffle, and then flow from the cooling water channel 2 to the circulating water tank, thereby achieving cooling and heat insulation of the baffle and further protecting the baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of a laboratory fume hood in the present application.

[0032] Figure 2 It is a cross-sectional schematic diagram of the overall structure of a laboratory fume hood of the present application.

[0033] Figure 3 It is a schematic diagram of the water storage tank structure of a laboratory fume hood in the present application.

[0034] Figure 4 It is a cross-sectional schematic diagram of the main control pipe structure of a laboratory fume hood of the present application.

[0035] Figure 5 This is a cross-sectional schematic diagram of a water distribution pipe structure of a laboratory fume hood in this application.

[0036] Description of the reference numerals: 1. cabinet; 11. bottom plate; 111. limit groove; 112. sealing gasket; 113. water receiving hole; 12. top plate; 121. slide hole; 122. push cylinder; 13. side plate; 131. slide groove; 14. rear panel; 15. air inlet pipe; 16. air outlet pipe; 18. cooling water channel 1; 2. experimental chamber; 3. baffle; 31. cooling water channel 2; 32. positioning groove; 4. inert gas fire extinguisher; 41. air outlet pipe; 42. control valve; 5. storage Water tank; 51. Water supply pipe; 52. Drain pipe; 521. Drain valve; 53. Main water pipe; 531. Main control valve; 54. Main control pipe 1; 541. Valve; 55. Main control pipe 2; 551. Stop valve; 552. Receiver pipe; 553. Temperature sensing box; 554. Wax column; 56. Connecting pipe; 57. Water distribution pipe; 571. Connecting sleeve; 572. Push spring; 6. Circulating water tank; 61. Circulating water pipe; 62. Circulating water pump; 63. Return pipe; 64. Water connecting pipe. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The embodiment of the present application discloses a laboratory fume hood.

[0039] Reference Figure 1 and Figure 2 A laboratory fume hood includes a cabinet body 1, which is rectangular. An experimental cavity 2 is arranged on one side of the cabinet body 1, the lower side of the cabinet body 1 corresponding to the experimental cavity 2 is a bottom plate 11, the upper side of the cabinet body 1 corresponding to the experimental cavity 2 is a top plate 12, both sides of the cabinet body 1 corresponding to the experimental cavity 2 are side plates 13, and the rear surface of the cabinet body 1 corresponding to the experimental cavity 2 is a rear panel 14. The bottom plate 11, the top plate 12, the two side panels 13 and the rear panel 14 are all integrally formed of stainless steel plates.

[0040] Reference Figure 1 and Figure 2The cabinet 1 is provided with a transparent baffle 3 vertically on the open side of the experimental chamber 2. In the embodiment, the baffle 3 is made of explosion-proof glass. The two side panels 13 are provided with slide grooves 131 vertically on both sides of the baffle 3. The two sides of the baffle 3 are vertically slidably connected to the slide grooves 131. To ensure the sealing between the slide grooves 131 and the baffle 3, a high-temperature resistant and fireproof sealing pad 112 is fixed in the slide grooves 131. A slide hole 121 is provided on the upper side of the top plate 12 corresponding to the baffle 3. The upper end of the baffle 3 extends out of the upper side of the top plate 12. A push cylinder 122 is fixedly connected to both sides of the cabinet 1 corresponding to the top plate 12. The telescopic rod of the push cylinder 122 is arranged upward and fixedly connected to both sides of the baffle 3. The push cylinder 122 drives the telescopic rod to move downward, which can drive the baffle 3 to move downward, thereby sealing the open side of the experimental chamber 2.

[0041] Reference Figure 2 and Figure 3 The bottom plate 11 is provided with a limiting groove 111 on the lower side corresponding to the baffle 3, and a sealing gasket 112 is fixedly connected to the bottom surface of the limiting groove 111. The sealing gasket 112 is a fireproof and high temperature resistant gasket. The push cylinder 122 drives the telescopic rod to extend and can drive the baffle 3 to move downward, so that the lower end of the baffle 3 is inserted into the limiting groove 111, and the lower end of the baffle 3 is abutted against the sealing gasket 112, thereby achieving the sealing of the experimental chamber 2.

[0042] Reference Figure 3 An air inlet pipe 15 and an air outlet pipe 16 are vertically fixedly connected to the upper side of the corresponding bottom plate 11 of the fume hood. The air outlet pipe 16 and the air inlet pipe 15 are fixedly connected with regulating valves. The air inlet pipe 15 and the air outlet pipe 16 are used to realize ventilation in the experimental chamber 2 of the fume hood. The regulating valve is used to adjust the air volume of the air inlet pipe 15 and the air outlet pipe 16.

[0043] Replay Figure 1 and Figure 2 An inert gas fire extinguishing tank 4 is arranged outside the cabinet 1, and an outlet of the inert gas fire extinguishing tank 4 is fixedly connected with an outlet pipe 41, which extends into the experimental chamber 2 of the cabinet 1 and communicates with the experimental chamber 2, and a control valve 42 is fixedly connected in the middle of the outlet pipe 41. When a fire occurs in the experimental chamber 2 of the fume hood, the ventilation pipe and the air inlet pipe 15 are closed, and the fire can be automatically extinguished after waiting for the oxygen in the experimental chamber to burn out, or the control valve 42 can be opened to allow the low-oxygen, non-combustible, non-combustible mixed inert gas in the inert gas fire extinguishing tank 4 to be delivered to the experimental chamber, thereby quickly realizing the fire extinguishing in the experimental chamber 2.

[0044] Reference Figure 3 and Figure 4, the back panel 14, the bottom plate 11, the top plate 12 and the two side plates 13 are all provided with cooling water channels 18 that are interconnected, a water storage tank 5 is fixedly connected to the upper side of the fume hood, a water supply pipe 51 is fixedly connected to the upper side of the water storage tank 5, the water supply pipe 51 extends out of the cabinet body 1, and a drainage pipe 52 is also fixedly connected to one end of the lower side of the water storage tank 5, one end of the drainage pipe 52 extends out of one side of the fume hood, and a drainage valve 521 is fixedly connected to the drainage pipe 52. When in use, the water supply pipe 51 can be connected to an external faucet to pass water into the water storage tank 5 to ensure that the water in the water storage tank 5 is sufficient. When the water in the water tank needs to be discharged, the drainage valve 521 is opened to discharge the water in the water storage tank 5.

[0045] Reference Figure 3 and Figure 4 A main water pipe 53 is fixedly connected to the lower side of the water storage tank 5, a main control valve 531 is fixedly connected to the middle of the main water pipe 53, a main control pipe 1 54 and a main control pipe 2 55 are fixedly connected to the lower end of the main water pipe 53, and a connecting pipe 56 is commonly connected to the lower ends of the main control pipe 1 54 and the main control pipe 2 55, and the lower end of the connecting pipe 56 is fixedly connected to the upper side of the top plate 12 and is connected to the water inlet of the cooling water channel 18. A valve 541 is fixedly connected to the middle of the main control pipe 1 54, a stop valve 551 is fixedly connected to the upper part of the main control pipe 2 55, and a vertically arranged receiving pipe 552 is threadedly connected to the lower part of the main control pipe 2 55. The lower end of the receiving pipe 552 extends out of the lower side of the top plate 12 and is fixedly connected to a temperature sensing box 553. The temperature sensing box 553 is cylindrical, and a wax column 554 is vertically fixedly connected to the receiving pipe 552. The upper end of the wax column 554 extends into the main control pipe 2 55 and can close the main control pipe 2 55, and the lower end of the wax column 554 extends into the temperature sensing box 553.

[0046] When in use, experiments can be carried out in the experimental chamber 2. When a fire occurs in the experimental chamber 2, the valve 541 can be opened, and the water flow in the water tank 5 can directly flow through the main control pipe 54 to the cooling water channel 18, thereby cooling the rear panel 14, the bottom plate 11, the top plate 12 and the two side plates 13 of the experimental chamber 2 through the cooling water channel 18. On the other hand, heat insulation is also achieved, reducing heat transfer to the interior of the fume hood and protecting the internal equipment of the fume hood. In addition, after the stop valve 551 is opened, if a fire occurs without the staff noticing, if the valve 541 is not opened in time, the temperature in the experimental chamber 2 will increase, and the temperature of the temperature sensing box 553 will also increase, which will cause the wax column 554 in the temperature sensing box 553 and the receiving tube 552 to melt, and the melted wax column 554 will flow into the temperature sensing box 553. At this time, the main control pipe 2 55 will also be connected, so that the water in the water tank will flow from the main control pipe 2 55 to the cooling water channel 18, thereby cooling the rear panel 14, bottom plate 11, top plate 12 and two side plates 13 of the experimental chamber 2, and insulating the internal components of the fume hood. When the wax column 554 melts in the receiving tube 552 and the temperature sensing box 553, the stop valve 551 can be closed to seal the main control tube 2 55. Then, the receiving tube 552 can be removed from the main control tube 2 55 to replace the new receiving tube 552, the temperature sensing box 553 and the wax column 554 for subsequent reuse.

[0047] Reference Figure 2 and Figure 5 A water distribution pipe 57 is fixedly connected to one side of the connecting pipe 56 near the baffle 3. A connecting sleeve 571 is sleeved on one end of the water distribution pipe 57 near the baffle 3. The inner circumference of the connecting sleeve 571 abuts against the water distribution pipe 57, and the water distribution pipe 57 can slide along the axial direction of the water distribution pipe 57. A push spring 572 is sleeved on the circumference of the water distribution pipe 57. One end of the push spring 572 is fixedly connected to the water distribution pipe 57, and the other end of the push spring 572 is fixedly connected to the connecting sleeve 571. Under normal conditions, the push spring 572 can push the connecting sleeve 571 to move toward the baffle 3 until it abuts against the baffle 3. The end of the connecting sleeve 571 away from the water distribution pipe 57 is tapered. A cooling water channel 2 31 is provided in the baffle 3, and a tapered positioning groove 32 is provided on the baffle 3 at the position corresponding to the water inlet hole of the cooling water channel 2 31. As the baffle 3 moves downward, when the lower end of the baffle 3 abuts against the sealing gasket 112 of the limiting groove 32, the end of the connecting sleeve 571 away from the water distribution pipe 57 can be inserted into the positioning groove 32 of the baffle 3, so that the water distribution pipe 57 is connected with the water inlet of the second cooling water channel 31 of the baffle 3. Thus, the water in the water storage tank 5 flows from the water distribution pipe 57 to the second cooling water channel 31 of the baffle 3, so as to cool the baffle 3.

[0048] See back Figure 2 and Figure 3A circulating water tank 6 is fixedly connected to the lower side of the fume hood corresponding to the experimental chamber 2, and a refrigerator is arranged in the circulating water tank 6. A circulating water pipe 61 is connected between the circulating water tank 6 and the water storage tank 5, and a circulating water pump 62 is fixedly connected to the middle of the circulating water pipe 61. A return water pipe 63 is fixedly connected to the upper side of the circulating water tank 6, and the upper end of the return water pipe 63 is connected to the water outlet of the cooling water channel 18, and the lower end of the return water pipe 63 is connected to the circulating water tank 6. A water receiving pipe 64 connected to the circulating water pipe 61 is fixedly connected to the upper side of the circulating water tank 6, and the upper end of the water receiving pipe 64 extends to the position of the positioning groove 32 of the bottom plate 11. The sealing gasket 112 is provided with a water receiving hole 113 at the upper end of the water receiving pipe 64. The baffle 3 moves downward, so that the outlet of the cooling water channel 2 31 can be connected to the water receiving hole 113 of the sealing gasket 112. The water flow in the cooling water channel 1 18 can flow into the circulating water tank 6 through the return pipe 63, and the water flow in the cooling water channel 2 31 can flow into the circulating water tank 6 through the water receiving pipe 64. Then, the water in the circulating water tank 6 can be cooled by the refrigerator, and then, the cooled water flow can be sent back to the water storage tank 5 through the circulating water pump 62.

[0049] The implementation principle of a laboratory fume hood in an embodiment of the present application is as follows: when in use, experiments can be carried out in the experimental chamber 2, and when a fire occurs in the experimental chamber 2, the valve 541 can be opened, and the water flow in the water tank 5 can directly flow through the main control pipe 54 to the cooling water channel 18, thereby cooling the rear panel 14, the bottom plate 11, the top plate 12 and the two side plates 13 of the experimental chamber 2 through the cooling water channel 18, and on the other hand, heat insulation is also achieved, reducing the heat transferred to the interior of the fume hood, thereby protecting the internal equipment of the fume hood. In addition, after the stop valve 551 is opened, if a fire occurs without the staff noticing, if the valve 541 is not opened in time, the temperature in the experimental chamber 2 will increase, and the temperature of the temperature sensing box 553 will also increase, which will cause the wax column 554 in the temperature sensing box 553 and the receiving tube 552 to melt, and the melted wax column 554 will flow into the temperature sensing box 553. At this time, the main control pipe 2 55 will also be connected, so that the water in the water tank will flow from the main control pipe 2 55 to the cooling water channel 18, and then from the cooling water channel 18 to the circulating water tank 6, so as to cool the rear panel 14, the bottom plate 11, the top plate 12 and the two side plates 13 of the experimental chamber 2, and insulate the internal components of the fume hood. When the wax column 554 melts in the receiving tube 552 and the temperature sensing box 553, the stop valve 551 can be closed to seal the main control tube 2 55. Then, the receiving tube 552 can be removed from the main control tube 2 55 to replace the new receiving tube 552, the temperature sensing box 553 and the wax column 554 for subsequent reuse.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A laboratory fume hood, comprising a cabinet (1), wherein one side of the cabinet (1) is provided with an experimental cavity (2), the side of the cabinet (1) corresponding to the laboratory is provided with the experimental cavity (2), the lower side of the cabinet (1) corresponding to the experimental cavity (2) is a bottom plate (11), the upper side of the cabinet (1) corresponding to the experimental cavity (2) is a top plate (12), both sides of the cabinet (1) corresponding to the experimental cavity (2) are side plates (13), the rear surface of the cabinet (1) corresponding to the experimental cavity (2) is a rear panel (14), and the open side of the cabinet (1) corresponding to the experimental cavity (2) is provided with a transparent baffle (3) capable of vertical movement to close the experimental cavity (2), characterized in that: The rear panel (14), the bottom panel (11), the top panel (12) and the two side panels (13) are all provided with cooling water channels (18) that are interconnected. A water storage tank (5) is provided on the upper side of the cabinet body (1) corresponding to the top panel (12). A main control pipe (54) that is connected to the water inlet of the cooling water channel (18) and the water storage tank (5) is fixedly connected to the lower side of the water storage tank (5). A valve (541) is fixedly connected to the main control pipe (54). A circulating water tank (6) that is connected to the water outlet of the cooling water channel (18) is fixedly connected to the lower side of the cabinet body (1); A second main control pipe (55) is provided on the lower side of the water storage tank (5) for connecting the water storage tank (5) and a first cooling water channel (18); A connecting pipe (56) is fixedly connected to the lower ends of the main control pipe 1 (54) and the main control pipe 2 (55), and the connecting pipe (56) is connected to the water inlet of the circulating water pipe (61). A water distribution pipe (57) is fixedly connected to the side of the connecting pipe (56) close to the baffle (3), and a water receiving pipe (64) is fixedly connected to one side of the circulating water tank (6). A cooling water channel 2 (31) is provided in the baffle (3), and the water inlet of the cooling water channel 2 (31) moves downward with the baffle (3) to abut against the bottom plate (11) and can be connected to the water distribution pipe (57), and the water outlet of the cooling water channel 2 (31) moves downward with the baffle (3) to abut against the bottom plate (11) and can be connected to the water receiving pipe (64); A pushing cylinder (122) is fixedly connected to both sides of the cabinet (1) corresponding to the baffle (3); the telescopic rod of the pushing cylinder (122) is arranged upward and fixedly connected to the baffle (3).

2. The laboratory fume hood according to claim 1, characterized in that: A receiving tube (552) is provided in the middle of the main control tube (55), the lower end of which extends to the lower side of the top plate (12); the lower end of the receiving tube (552) is fixedly connected to a temperature sensing box (553) having a diameter larger than that of the receiving tube (552); a wax column (554) is fixedly connected in the receiving tube (552), the upper end of which extends into the main control tube (55) and is capable of sealing the main control tube (55); the wax column (554) extends into the temperature sensing box (553) and abuts against the inner bottom surface of the temperature sensing box (553).

3. The laboratory fume hood according to claim 1, characterized in that: A water supply pipe (51) is fixedly connected to the upper side of the water storage tank (5), a refrigerator is arranged in the circulating water tank (6), a circulating water pipe (61) is connected between the circulating water tank (6) and the water storage tank (5), and a circulating water pump (62) is fixedly connected to the middle of the circulating water pipe (61).

4. The laboratory fume hood according to claim 1, characterized in that: The water distribution pipe (57) is sleeved at one end close to the baffle (3) with a connecting sleeve (571) that can slide along the axial direction of the water distribution pipe (57), and the water distribution pipe (57) is sleeved with a push spring (572) that can push the connecting sleeve (571) to move toward the baffle (3) under normal conditions.

5. The laboratory fume hood according to claim 4, characterized in that: The end of the connecting sleeve (571) away from the water distribution pipe (57) is tapered, and the baffle (3) is provided with a tapered positioning groove (32) at a position corresponding to the water inlet hole of the second cooling water channel (31).

6. The laboratory fume hood according to claim 2, characterized in that: The upper side of the main control pipe 2 (55) corresponding to the receiving pipe (552) is connected with a stop valve (551), and the receiving pipe (552) is detachably connected to the main control pipe 2 (55).

7. The laboratory fume hood according to claim 1, characterized in that: The bottom plate (11) is provided with a limiting groove (111) on the lower side of the baffle plate (3), a sealing gasket (112) is fixedly connected to the bottom surface of the limiting groove (111), and the upper end of the water receiving pipe (64) extends to the position of the sealing gasket (112).

8. The laboratory fume hood according to claim 1, characterized in that: An inert gas fire extinguishing tank (4) is arranged in the cabinet (1); an outlet pipe (41) of the inert gas fire extinguishing tank (4) is connected to the experimental chamber (2); and a control valve (42) is arranged on the outlet pipe (41).

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