Pipe-free ventilation cabinet capable of automatically adjusting air speed

Abstract

The utility model discloses a pipe-free ventilation cabinet capable of automatically adjusting wind speed, which comprises a cabinet body, a gas purifying device and a door opening device, an experiment port is arranged on one side of the cabinet body, protective glass is arranged in the experiment port, the gas purifying device comprises a mounting box, a mounting bracket is arranged at the bottom of the mounting box, and the door opening device is arranged on the mounting bracket. A first filter is arranged at the bottom of the mounting support, a fan and a gas sensor are arranged at the top of the mounting support, the door opening device comprises a lifting device and a displacement sensor, the lifting device is embedded in the cabinet body and connected with the left side and the right side of the protective glass, and the displacement sensor is fixed to one side of the protective glass at the bottom. The pipe-free ventilation cabinet capable of automatically adjusting the air speed is advanced in design, compact in structure and convenient to use, the opening size of the cabinet door can be adjusted at will, the change of the opening size of the cabinet door can be monitored in real time, then the rotating speed of the draught fan is controlled to change accordingly, and it is guaranteed that the face air speed can meet the safety requirement all the time.

Description

Technical Field

[0001] The utility model belongs to the technical field of fume hoods, and in particular relates to a ductless fume hood capable of automatically adjusting wind speed. Background Art

[0002] In order to prevent laboratory workers from inhaling or swallowing some toxic, pathogenic or unknown toxic chemicals and organisms, the laboratory should have good ventilation. Fume hoods are an indispensable part of laboratory ventilation design. Fume hoods are fully functional and tightly protected. They not only provide comprehensive protection for operators, but also withstand the corrosion of various chemical acids, alkalis and organic reagents, and do not contaminate the internal experimental samples. It ensures the smooth discharge of toxic, harmful and odorous gases, so that the experimental environment can achieve the safety effect specified by national standards. Traditional fume hoods use forced exhaust and ducts to discharge toxic gases outdoors, but the installation of ducts is large and will limit the location of the fume hood. In addition, the direct discharge of toxic and harmful gases without treatment will also pollute the environment. Therefore, ductless fume hoods that can treat exhaust gas and return the treated clean air to the room are widely used.

[0003] There are still some areas that need to be improved in the current ductless fume hoods. For example, the door of the ductless fume hood can only be opened to a fixed size, and the fan speed remains constant to achieve a constant wind speed on the fume hood surface. However, the fixed size of the door opening is not suitable for practical applications, and when the door opening size is changed, the fan speed remains unchanged, which may cause the surface wind speed to fail to meet the requirements, thereby causing the escape of harmful gases. Therefore, it is urgent to design a ductless fume hood that automatically adjusts the wind speed to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a ductless fume hood with automatic wind speed adjustment to solve the problems existing in the above-mentioned background technology.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a ductless fume hood with automatic wind speed adjustment, comprising:

[0006] A cabinet, one side of which is provided with an experimental opening, and a protective glass is provided in the experimental opening, wherein the protective glass comprises a top protective glass, a middle protective glass and a bottom protective glass which are sequentially arranged from top to bottom, and a push-pull rod is fixedly connected to the bottom of the bottom protective glass;

[0007] An air purification device, the air purification device comprising a mounting box fixed to the top of the cabinet, a mounting bracket being provided at the bottom of the mounting box, a first filter being provided at the bottom of the mounting bracket, a fan and a gas sensor being provided at the top of the mounting bracket, a transverse partition being provided directly above the fan, and a second filter being provided at the top of the transverse partition;

[0008] The door opening device comprises a puller and a displacement sensor. The puller is embedded in the cabinet and connected to the left and right sides of the protective glass. The displacement sensor is fixed on one side of the bottom protective glass.

[0009] Furthermore, a plurality of control switches are provided on one side of the cabinet, and a plurality of medicine outlet pipes are provided on the inner wall of the cabinet. The control switches correspond to the solenoid valves on the medicine outlet pipes one by one and are electrically connected.

[0010] Furthermore, the first filter and the second filter have the same cross-sectional size, and both are activated carbon filters.

[0011] Furthermore, a start switch, an alarm, a function panel and a surface wind speed sensor are respectively provided on one side of the installation box.

[0012] Furthermore, a longitudinal partition plate is provided in the installation box, a wiring cavity is formed between the installation box and the longitudinal partition plate, and a plurality of cables connected to various electrical appliances are provided in the wiring cavity.

[0013] Furthermore, the puller is any one of a screw puller, a pulley puller or a constant force puller.

[0014] Furthermore, a single chip microcomputer is provided on one side of the functional panel, and the single chip microcomputer is electrically connected to the fan, the gas sensor, the start switch, the alarm, the surface wind speed sensor and the displacement sensor respectively.

[0015] The technical effects and advantages of the utility model are as follows: the ductless fume hood with automatic wind speed adjustment has advanced design, compact structure and easy use. By arranging pullers on both sides of the protective glass, the bottom protective glass can be suspended at any height to realize arbitrary adjustment of the cabinet door opening size. By arranging a displacement sensor, the change of the cabinet door opening size can be monitored in real time, and then the speed of the fan can be controlled by the single-chip microcomputer to change accordingly, ensuring that the surface wind speed can always meet the safety requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial structural schematic diagram of the utility model;

[0017] Figure 2 It is a rear view of the utility model;

[0018] Figure 3 It is a vertical cross-sectional view of the utility model from the right side.

[0019] In the figure: 100, cabinet; 101, experimental port; 102, protective glass; 1021, top protective glass; 1022, middle protective glass; 1023, bottom protective glass; 103, push-pull rod; 104, control switch; 105, medicine outlet pipe; 200, air purification device; 201, installation box; 202, installation bracket; 203, first filter; 204, fan; 205, gas sensor; 206, horizontal partition; 207, second filter; 208, start switch; 209, alarm; 210, function panel; 211, surface wind speed sensor; 212, longitudinal partition; 213, wiring chamber; 300, door opening device; 301, puller; 302, displacement sensor. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The utility model provides Figure 1-3 A ductless fume hood with automatic wind speed adjustment as shown in the figure comprises:

[0024] A cabinet 100, a test opening 101 is provided on one side of the cabinet 100, a protective glass 102 is provided in the test opening 101, the protective glass 102 comprises a top protective glass 1021, a middle protective glass 1022 and a bottom protective glass 1023 which are arranged alternately from top to bottom, and a push-pull rod 103 is fixedly connected to the bottom of the bottom protective glass 1023, so that the middle protective glass 1022 and the bottom protective glass 1023 can be pushed upward by the push-pull rod 103 to open the cabinet door;

[0025] The air purification device 200 includes a mounting box 201 fixed on the top of the cabinet 100, a mounting bracket 202 is provided at the bottom of the mounting box 201, a first filter 203 is provided at the bottom of the mounting bracket 202, a fan 204 and a gas sensor 205 are provided at the top of the mounting bracket 202, a transverse partition plate 206 is provided directly above the fan 204, and a second filter 207 is provided on the top of the transverse partition plate 206. The air in the cabinet 100 is drawn upward by the fan 204, so that the air passes through the first filter 203 and the second filter 207 in sequence, thereby realizing secondary filtration and greatly improving the filtration effect;

[0026] The door opening device 300 includes a lifter 301 and a displacement sensor 302. The lifter 301 is embedded in the cabinet 100 and connected to the left and right sides of the protective glass 102. The lifter 301 is used to realize the tightness and suspension of the protective glass 102. The operating principle of the lifting window is the same as that of the lifting window, which belongs to the scope of the prior art and will not be elaborated here. The displacement sensor 302 is fixed on one side of the bottom protective glass 1023. The displacement sensor 302 can monitor the displacement distance of the bottom protective glass 1023 in real time, and then determine the opening size of the cabinet door, so as to facilitate the automatic adjustment of the rotation speed of the fan 204, so that no matter how the size of the cabinet door opening changes, the surface wind speed of the air entering the cabinet 100 can always be kept within the safe range of 0.4 to 0.6 m / s, effectively preventing the escape of harmful gases in the cabinet 100.

[0027] In addition, a plurality of control switches 104 are provided on one side of the cabinet 100, and a plurality of medicine outlet pipes 105 are provided on the inner wall of the cabinet 100. One end of the medicine outlet pipe 105 is sealed and connected to a medicine storage tank outside the cabinet 100 through a conveying pipe. The control switch 104 corresponds to the solenoid valve on the medicine outlet pipe 105 one by one and is electrically connected. Different medicines can be taken by pressing different control switches 104, which can not only improve the accuracy of the medicine amount taken, but also avoid multiple medicine storage tanks occupying a large amount of internal space of the cabinet 100, resulting in a smaller experimental table. It can also avoid the experimental drugs from evaporating a large amount of harmful gases in the cabinet 100 during storage, causing a high purification and filtration pressure of the purification device 200.

[0028] Specifically, the first filter 203 and the second filter 207 have the same cross-sectional dimensions and both are activated carbon filters, which have good filtering effects.

[0029] It is worth mentioning that a starting switch 208, an alarm 209, a function panel 210 and a surface wind speed sensor 211 are respectively provided on one side of the installation box 201, so that the on and off of the main circuit of the cabinet 100 can be conveniently controlled through the starting switch 208. When the gas sensor 205 detects harmful gas, the alarm 209 can be used to remind the staff to replace the first filter 203 in time, and the operating status of each electrical appliance can be displayed through the function panel 210. At the same time, it is also convenient to manually input control instructions. The surface wind speed sensor 211 can monitor the surface wind speed of the air entering the cabinet 100 in real time to ensure safety.

[0030] Specifically, a longitudinal partition plate 212 is provided in the installation box 201, and a wiring cavity 213 is formed between the installation box 201 and the longitudinal partition plate 212. A plurality of cables connected to various electrical appliances are provided in the wiring cavity 213 to facilitate cable arrangement.

[0031] It should be noted that the lifter 301 adopts a screw-type lifter. The spring of the screw-type lifter is wrapped around the unequally spaced alloy screw in the center. The spring can be completely embedded in the unequally spaced screw on the screw and then wrapped by a metal aluminum tube to protect the moving parts and reduce operating noise. Since the tension is accumulated in the spring, the screw-type lifter can reduce the force when opening and closing the protective glass 102. When the bottom protective glass 1023 rises, the tension accumulated in the spring is released to provide auxiliary force. The special structural design of the spiral rod provides continuous and uniform auxiliary force for the opening and closing of the protective glass 102.

[0032] Specifically, a single chip microcomputer is provided on one side of the function panel 210, and the single chip microcomputer is electrically connected to the fan 204, the gas sensor 205, the start switch 208, the alarm 209, the surface wind speed sensor 211 and the displacement sensor 302, so as to facilitate the coordinated operation of various electrical appliances through the single chip microcomputer.

[0033] Working principle: When the ductless fume hood with automatic wind speed adjustment is used, first turn on the start switch 208 to provide power support for the main circuit in the cabinet 100. At this time, the fan 204 starts to run, and then the bottom protective glass 1023 is pushed upward by the push-pull rod 103. Then, according to actual needs, the opening size of the cabinet door is adjusted. The displacement sensor 302 sends the information of the running distance of the bottom protective glass 1023 to the single-chip microcomputer, and the speed of the fan 204 is adjusted by the single-chip microcomputer. Then, press the corresponding control switch 104, take out the corresponding experimental medicine through the medicine outlet pipe 105, and then conduct experiments in the cabinet 100. The harmful gases generated during the experiment float upward under the attraction of the fan 204, and pass through the first filter 203 and the second filter 207 in turn, and are discharged from the cabinet 100 after two filtrations. The ductless fume hood with automatic wind speed adjustment has advanced design, compact structure and is easy to use. By arranging pullers 301 on both sides of the protective glass 102, the bottom protective glass 1023 can be suspended at any height to achieve arbitrary adjustment of the cabinet door opening size. By arranging a displacement sensor 302, the change of the cabinet door opening size can be monitored in real time, and then the rotation speed of the fan 204 can be controlled by the single-chip microcomputer to change accordingly, ensuring that the surface wind speed can always meet the safety requirements.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A ductless fume hood with automatic wind speed adjustment, characterized in that: include: A cabinet (100), wherein a test opening (101) is provided on one side of the cabinet (100), a protective glass (102) is provided in the test opening (101), the protective glass (102) comprises a top protective glass (1021), a middle protective glass (1022) and a bottom protective glass (1023) which are arranged in sequence from top to bottom, and a push-pull rod (103) is fixedly connected to the bottom of the bottom protective glass (1023); An air purification device (200), the air purification device (200) comprising a mounting box (201) fixed to the top of a cabinet (100), a mounting bracket (202) being provided at the bottom of the mounting box (201), a first filter (203) being provided at the bottom of the mounting bracket (202), a fan (204) and a gas sensor (205) being provided at the top of the mounting bracket (202), a transverse partition plate (206) being provided directly above the fan (204), and a second filter (207) being provided at the top of the transverse partition plate (206); A door opening device (300), the door opening device (300) comprising a lifter (301) and a displacement sensor (302), the lifter (301) being embedded in the cabinet (100) and connected to the left and right sides of the protective glass (102), and the displacement sensor (302) being fixed to one side of the bottom protective glass (1023).

2. The ductless fume hood with automatic wind speed adjustment according to claim 1 is characterized in that: A plurality of control switches (104) are provided on one side of the cabinet (100), a plurality of medicine outlet pipes (105) are provided on the inner side wall of the cabinet (100), and the control switches (104) correspond to the solenoid valves on the medicine outlet pipes (105) one by one and are electrically connected.

3. The ductless fume hood with automatic wind speed adjustment according to claim 1 is characterized in that: The first filter (203) and the second filter (207) have the same cross-sectional dimensions and both are activated carbon filters.

4. The ductless fume hood with automatic wind speed adjustment according to claim 1 is characterized in that: A start switch (208), an alarm (209), a function panel (210) and a surface wind speed sensor (211) are respectively provided on one side of the installation box (201).

5. The ductless fume hood with automatic wind speed adjustment according to claim 1 is characterized in that: A longitudinal partition plate (212) is provided in the installation box (201), a wiring cavity (213) is formed between the installation box (201) and the longitudinal partition plate (212), and a plurality of cables connected to various electrical appliances are provided in the wiring cavity (213).

6. The ductless fume hood with automatic wind speed adjustment according to claim 1 is characterized in that: The puller (301) is any one of a screw-type puller, a pulley-type puller or a constant-force puller.

7. The ductless fume hood with automatic wind speed adjustment according to claim 4 is characterized in that: A single chip microcomputer is provided on one side of the functional panel (210), and the single chip microcomputer is electrically connected to the fan (204), the gas sensor (205), the start switch (208), the alarm (209), the surface wind speed sensor (211), and the displacement sensor (302), respectively.

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