Limiting ventilation cabinet

Abstract

The limiting ventilation cabinet comprises a cabinet body, a window and a limiting piece, a containing cavity is formed in the cabinet body, a taking and placing opening communicated with the containing cavity is formed in the side wall of the cabinet body, the window is arranged on the cabinet body in a sliding mode in the vertical direction so as to open or close the taking and placing opening, and the window is provided with a matching part. The limiting piece is arranged on the cabinet body and has a first state for preventing the matching part from passing through so as to prevent the pick-and-place opening from being completely opened and a second state for allowing the matching part to pass through so as to allow the pick-and-place opening to be completely opened. Under the blocking of the limiting piece, the opening degree of the window can be prevented from being too large. When the pick-and-place opening needs to be completely opened, the limiting piece can be adjusted to the second state, the window can continuously slide without being hindered, and then the pick-and-place opening is completely opened. By means of the limiting ventilation cabinet, the opening degree of the window can be limited through the limiting piece in the experiment process, and the problem that harmful gas overflows due to the fact that the opening degree of the window exceeds a threshold value is solved.

Description

Technical Field

[0001] This utility model relates to the field of fume hoods, specifically to a limit-position fume hood. Background Technology

[0002] Fume hoods (also known as ventilation cabinets or exhaust hoods) are used to capture, contain, and remove waste gases and harmful gases, creating a safe working environment and preventing users from inhaling waste gases or harmful gases that could endanger their lives or health.

[0003] Existing fume hoods, as seen in patent application number CN201710939219.1, have internal storage space and an exhaust vent at the top, causing exhaust gases to accumulate primarily at the top. Therefore, during experiments, the opening of the fume hood's viewing window should not be too large to prevent harmful gases at the top from escaping.

[0004] Therefore, how to prevent the window opening from exceeding the safety threshold is a technical problem that urgently needs to be solved. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a limited ventilation hood to solve the technical problem of how to prevent the opening of the viewing window from exceeding the safety threshold in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a limited-position ventilation hood, which includes:

[0008] The cabinet has a receiving cavity inside, and the side wall of the cabinet has an opening for taking out and putting in the receiving cavity;

[0009] A viewing window, which slides vertically within the cabinet to open or close the access port, and the viewing window has a mating part; and

[0010] A limiting member, which is installed on the cabinet, has a first state that blocks the passage of the mating part to prevent the pick-up and put-out port from being fully opened, and a second state that allows the mating part to pass through to allow the pick-up and put-out port to be fully opened.

[0011] In some embodiments, the cabinet has a tongue cavity, and the limiting member includes a tongue and an elastic part. The tongue is movably disposed in the tongue cavity. When the limiting member is in the first state, the tongue part protrudes from the tongue cavity to block the passage of the mating part. When the limiting member is in the second state, the tongue part is hidden in the tongue cavity to allow the mating part to pass through. The elastic part connects the tongue part and the cabinet and has an elastic force that causes the tongue part to protrude from the tongue cavity.

[0012] In some embodiments, the tip of the tongue has a guide wedge surface.

[0013] In some embodiments, the tongue is rotatably embedded in the tongue cavity, and the elastic part includes a torsion spring, with its two ends connected to the elastic part and the cabinet respectively.

[0014] In some embodiments, the mating portion includes a grip, and the grip is located at the bottom end of the window.

[0015] In some embodiments, the grip has a slot.

[0016] In some embodiments, the top of the cabinet is provided with a vent that connects to the accommodating cavity.

[0017] In some embodiments, the window is a transparent window.

[0018] In some embodiments, the bottom end of the retrieval port has a support bracket, which supports the window when the retrieval port is closed by the viewing window.

[0019] In some embodiments, the support bracket is magnetic, having a magnetic force that attracts the window.

[0020] First, adjust the limiting component to the first state. When the operator needs to slightly open the access port, they can drag the window to open it. The limiting component prevents the window from opening too wide. When the access port needs to be fully opened, the limiting component can be adjusted to the second state, allowing the window to slide freely and fully open the access port. Using this limiting fume hood, the opening of the window can be restricted during experiments, preventing the window opening from exceeding the threshold and causing harmful gases to escape. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the limit-position fume hood provided in this embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the limiting member structure provided in an embodiment of the present utility model;

[0023] Explanation of reference numerals in the attached drawings: cabinet 100, tongue cavity 110, vent 120, support bracket 130, viewing window 200, mating part 210, handle 211, slot 2111, limiting part 300, tongue 310, guide wedge surface 311, elastic part 320, torsion spring 321. Detailed Implementation

[0024] To address the technical problem of preventing the opening of the viewing window 200 from exceeding the safety threshold, this invention provides a limiting fume hood that can restrict the opening of the viewing window 200, thus preventing the leakage of harmful gases caused by the opening of the viewing window 200 exceeding the threshold.

[0025] It should be noted that the limit fume hood of this utility model is used for, but not limited to, experiments that generate harmful gases. For ease of explanation, this utility model will only use the application of the limit fume hood to experiments that generate harmful gases as an example. The principle of the limit fume hood in other types of equipment is essentially the same as that in experiments that generate harmful gases, and will not be described in detail here.

[0026] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a limiting fume hood according to one embodiment of the present invention. The limiting fume hood includes a cabinet body 100, a viewing window 200, and a limiting member 300. The cabinet body 100 has a receiving cavity, and the side wall of the cabinet body 100 has a loading and unloading port communicating with the receiving cavity. The viewing window 200 is slidably disposed in the cabinet body 100 in a vertical direction to open or close the loading and unloading port, and the viewing window 200 has a mating part 210. The limiting member 300 is installed in the cabinet body 100 and has a first state that blocks the passage of the mating part 210 to prevent the loading and unloading port from being fully opened, and a second state that allows the passage of the mating part 210 to allow the loading and unloading port to be fully opened.

[0027] In this embodiment, the limiting member 300 is first adjusted to the first state. When the operator needs to slightly open the access port, the viewing window 200 can be dragged to open the access port. The limiting member 300 prevents the viewing window 200 from opening too wide. When the access port needs to be fully opened, the limiting member 300 can be adjusted to the second state, allowing the viewing window 200 to continue sliding unimpeded, thus fully opening the access port. Using the aforementioned limiting fume hood, the opening of the viewing window 200 can be limited by the limiting member 300 during experiments, preventing the opening of the viewing window 200 from exceeding a threshold and causing harmful gases to leak out.

[0028] In some embodiments, the cabinet 100 has a tongue cavity 110, and the limiting member 300 includes a tongue 310 and an elastic part 320. The tongue 310 is movably disposed in the tongue cavity 110. When the limiting member 300 is in a first state, the tongue 310 protrudes from the tongue cavity 110 to block the passage of the mating part 210. When the limiting member 300 is in a second state, the tongue 310 is hidden in the tongue cavity 110 to allow the mating part 210 to pass through. The elastic part 320 connects the tongue 310 and the cabinet 100 and has an elastic force that causes the tongue 310 to protrude from the tongue cavity 110.

[0029] In this embodiment, the elastic part 320 has the elastic force to push the tongue part 310 to protrude from the tongue cavity 110, thereby making the limiting member 300 in the first state. At this time, the tongue part 310 protruding from the tongue cavity 110 can block the mating part 210 from passing through. When it is necessary to fully open the take-out port, the limiting member 300 can be adjusted to the second state. At this time, the tongue part 310 is hidden in the tongue cavity 110, thereby allowing the mating part 210 to pass through.

[0030] In some embodiments, the tip of the tongue 310 has a guide wedge 311.

[0031] In this embodiment, since the tip of the tongue 310 has a guide wedge surface 311, when the window 200 moves from top to bottom and closes the take-up and put-down opening, the mating part 210 presses against the guide wedge surface 311, thereby pushing the tongue 310 to hide in the tongue cavity 110, so that the mating part 210 can pass smoothly.

[0032] Based on the above embodiments, in some embodiments, the tongue 310 is rotatably embedded in the tongue cavity 110, and the elastic part 320 includes a torsion spring 321, with the two ends of the torsion spring 321 respectively connected to the elastic part 320 and the cabinet 100.

[0033] In some embodiments, the mating part 210 includes a grip 211, and the grip 211 is located at the bottom of the window 200.

[0034] In this embodiment, the operator can drag the handle 211 to move the viewing window 200, thereby opening or closing the pick-up / drop-off port. The tongue 310 only needs to block the handle 211 to prevent the viewing window 200 from moving further.

[0035] Based on the above embodiments, in some of the embodiments, the grip 211 is provided with a slot 2111.

[0036] In this embodiment, the slot 2111 and the tongue 310 cooperate with each other. When the tongue 310 blocks the grip 211 from passing through, the tongue 310 is embedded in the slot 2111, thereby preventing the tongue 310 from moving relative to the grip 211 in the horizontal direction.

[0037] In some embodiments, the top of the cabinet 100 is provided with a vent 120 that communicates with the accommodating cavity.

[0038] In this embodiment, a fan can be used to extract harmful gases from the containment cavity through the vent 120 and export the harmful gases from the containment cavity.

[0039] In some embodiments, window 200 is a transparent window 200.

[0040] In this embodiment, the operator can observe the internal condition of the accommodating cavity through the transparent viewing window 200.

[0041] In some embodiments, the bottom of the retrieval opening has a support 130, which supports the window 200 when the retrieval opening is closed.

[0042] In this embodiment, the support 130 can cushion the window 200 to prevent the window 200 from being damaged by bumps.

[0043] Based on the above embodiments, in some embodiments, the support 130 is magnetic and has a magnetic force that attracts the window 200.

[0044] In this embodiment, when the window 200 closes the access opening, the support bracket 130 can use magnetic force to attract the window 200, which can avoid the presence of a gap between the bottom of the window 200 and the cabinet 100, and ensure the sealing of the accommodating cavity.

[0045] To better understand this utility model, the following is combined with... Figures 1 to 2 The technical solution of this utility model is described in detail below:

[0046] When the operator needs to slightly open the retrieval port, the elastic part 320 has the elastic force to push the tongue 310 partially protruding from the tongue cavity 110, thereby causing the limiting member 300 to be in the first state. At this time, the tongue 310 partially protruding from the tongue cavity 110 can block the passage of the mating part 210. When it is necessary to fully open the retrieval port, the limiting member 300 can be adjusted to the second state. At this time, the tongue 310 is hidden inside the tongue cavity 110, thereby allowing the mating part 210 to pass through. The viewing window 200 can then continue to slide unimpeded, thereby fully opening the retrieval port. Using the above-mentioned limiting fume hood, the opening degree of the viewing window 200 can be limited by the limiting member 300 during the experiment, avoiding the problem of harmful gas leakage caused by the opening degree of the viewing window 200 exceeding the threshold.

[0047] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A limit-position fume hood, characterized in that, include: The cabinet has a receiving cavity inside, and the side wall of the cabinet has an opening for taking out and putting in the receiving cavity; A viewing window, which slides vertically within the cabinet to open or close the access port, and the viewing window has a mating part; and A limiting member, which is installed on the cabinet, has a first state that blocks the passage of the mating part to prevent the pick-up and put-out port from being fully opened, and a second state that allows the mating part to pass through to allow the pick-up and put-out port to be fully opened.

2. The limit-position fume hood according to claim 1, characterized in that, The cabinet has a tongue cavity. The limiting member includes a tongue and an elastic part. The tongue is movably disposed in the tongue cavity. When the limiting member is in the first state, the tongue protrudes from the tongue cavity to block the passage of the mating part. When the limiting member is in the second state, the tongue is hidden in the tongue cavity to allow the mating part to pass through. The elastic part connects the tongue and the cabinet and has an elastic force that causes the tongue to protrude from the tongue cavity.

3. The limit-position fume hood according to claim 2, characterized in that, The tip of the tongue has a guide wedge surface.

4. The limit-position fume hood according to claim 3, characterized in that, The tongue is rotatably embedded in the tongue cavity, and the elastic part includes a torsion spring, with its two ends connected to the elastic part and the cabinet respectively.

5. The limit-position fume hood according to claim 2, characterized in that, The mating part includes a grip, and the grip is located at the bottom of the window.

6. The limit-position fume hood according to claim 5, characterized in that, The grip has a slot.

7. The limit-position fume hood according to claim 1, characterized in that, The top of the cabinet has a vent that connects to the accommodating cavity.

8. The limit-position fume hood according to claim 1, characterized in that, The window is a transparent window.

9. The limit-position fume hood according to claim 1, characterized in that, The bottom of the retrieval opening has a support bracket, which supports the window when the retrieval opening is closed.

10. The limit-position fume hood according to claim 9, characterized in that, The support bracket is magnetic and has a magnetic force that attracts the viewing window.

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