A window opening height limiting mechanism and a fume hood having the mechanism

Abstract

This utility model discloses a window opening height limiting mechanism and a fume hood having the same mechanism, relating to the field of fume hood technology. The window opening height limiting mechanism includes a housing with an opening groove inside. A window limiting switch is movably disposed within the opening groove. The top of the window limiting switch is hinged to the housing. A return spring is provided on the back of the window limiting switch. The window limiting switch has a limiting protrusion protruding outward from the opening groove. When the return spring is compressed, the limiting protrusion of the window limiting switch retracts into the opening groove. Applying the above-mentioned window opening height limiting mechanism to a fume hood, by limiting the opening height of the window, ensures that laboratory personnel maintain a safe distance from hazardous substances inside the fume hood during operation, preventing the large-scale overflow of toxic and harmful gases, aerosols, etc., reducing the risk of laboratory personnel coming into contact with harmful substances, and avoiding harm from chemical substances.

Description

Technical Field

[0001] This utility model relates to the field of fume hood technology, specifically to a window opening height limiting technology applied to fume hoods. Background Technology

[0002] In modern scientific research, medical, chemical and other fields of laboratory environment, fume hoods are widely used as a crucial safety protection device. Their main function is to effectively ventilate and promptly remove toxic and harmful gases, aerosols and other hazardous substances generated during experiments, thereby protecting the health of laboratory personnel and ensuring the safety of the experimental environment.

[0003] However, existing fume hoods have significant shortcomings in controlling the viewing window height. The lack of a precise and effective mechanism to limit the window opening height means that during operation, personnel may be unable to maintain a safe distance from hazardous materials inside the fume hood due to the window being opened too high. If a large amount of hazardous material spills out, personnel are highly susceptible to contact with these harmful substances, greatly increasing the risk of chemical injury and posing a serious threat to their lives. Therefore, developing a mechanism that can precisely limit the viewing window opening height has become a crucial problem urgently needing to be solved in the field of fume hood technology. Utility Model Content

[0004] The purpose of this utility model is to provide a window opening height limiting mechanism and a fume hood with the mechanism. By applying the above-mentioned window opening height limiting mechanism to the fume hood and limiting the opening height of the window, it can ensure that the experimental personnel maintain a safe distance from the hazardous substances in the fume hood during operation, prevent the large-scale overflow of toxic and harmful gases, aerosols, etc., reduce the risk of experimental personnel coming into contact with harmful substances, and avoid being harmed by chemical substances.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a window opening height limiting mechanism, comprising a housing, an opening groove provided inside the housing, a window limiting switch movably disposed within the opening groove, the top of the window limiting switch being hinged to the housing, a return spring provided on the back of the window limiting switch, and a limiting protrusion protruding outward from the opening groove on the window limiting switch; when the return spring is compressed, the limiting protrusion of the window limiting switch retracts into the opening groove.

[0006] To further optimize this utility model, the following technical solutions may be preferred:

[0007] Preferably, the housing includes a first fixing seat and a second fixing seat that are interlocked, and the opening slot is disposed in the first fixing seat.

[0008] Preferably, the limiting protrusion has a triangular structure, and the upper part of the limiting protrusion has an arc-shaped contact surface at the position where it engages with the window handle.

[0009] Preferably, a shock-absorbing pad is provided at the top pressure position at the bottom of the lower limiting groove.

[0010] Preferably, a limiting fixing shaft is provided through the upper position of the window limiting switch on the housing, and the window limiting switch rotates around the limiting fixing shaft.

[0011] Preferably, the window limit switch and the limit protrusion are integrally formed.

[0012] A fume hood includes a cabinet body with a liftable viewing window. A handle is provided at the bottom of the viewing window, and a lifting drive mechanism for raising and lowering the viewing window is provided at the top of the cabinet body. A mounting groove is provided on the cabinet body corresponding to one side of the viewing window, and a viewing window opening height limiting mechanism is provided in the mounting groove. When the limiting protrusion in the viewing window opening height limiting mechanism is in the pop-out state, the viewing window handle interferes with the limiting switch, and the viewing window cannot be opened further upward.

[0013] Preferably, the cabinet includes a front column, and the window opening height limiting mechanism is disposed on the front column.

[0014] Preferably, the lifting drive mechanism includes a traction belt and a transition pulley. The transition pulley is located at the top of the cabinet, and its circumferential surface is provided with teeth that cooperate with the traction belt. The traction end of the traction belt is connected to the top of the viewing window, and the other end of the traction belt is connected to a counterweight.

[0015] The beneficial effects of this utility model are:

[0016] (1) Significantly improved safety performance: By setting a window opening height limit mechanism, the opening height of the window is precisely limited, effectively ensuring that experimental personnel maintain a safe distance from hazardous substances inside the fume hood during operation. This greatly prevents the large-scale spillage of toxic and harmful gases, aerosols, etc., significantly reducing the risk of experimental personnel coming into contact with harmful substances, effectively protecting the lives of experimental personnel, and reducing the possibility of safety accidents caused by chemical leaks.

[0017] (2) It has shock absorption and protection functions: a shock absorption pad is set at the top pressure position at the bottom of the lower limit groove. When the window limit switch is subjected to the pressure of the window handle, the shock absorption pad can effectively buffer the impact force, reduce vibration and noise, not only protect the window limit switch itself and extend its service life, but also reduce the damage to the fume hood cabinet and improve the overall stability and comfort of the equipment operation.

[0018] (3) Overall performance optimization of the fume hood: The window opening height limiting mechanism is applied to the fume hood. When the limiting protrusion is in the pop-out state, the window handle interferes with the limit switch, preventing the window from opening further upwards. This ensures, from a hardware perspective, that the window height will not exceed the safety threshold. Placing the window opening height limiting mechanism on the front column facilitates installation and operation without affecting the normal operation of other components of the fume hood. Ensuring personnel safety: By limiting the window opening height, it ensures that laboratory personnel maintain a safe distance from hazardous substances inside the fume hood during operation, preventing the large-scale spillage of toxic and harmful gases and aerosols, reducing the risk of personnel contact with harmful substances, and avoiding harm from chemical substances.

[0019] (4) Ensure ventilation effect: The opening height of the window directly affects the air intake and internal airflow organization of the fume hood. Reasonable limit can enable the fume hood to operate under the designed airflow parameters, ensure that the exhaust volume and the intake volume are in a proper balance, maintain the negative pressure environment inside the fume hood, so that harmful gases can be effectively discharged, improve ventilation efficiency, prevent gas from spreading in the laboratory, and ensure the safety of the laboratory environment.

[0020] (5) Facilitates experimental operation: The limiting mechanism can control the opening height of the window within a range that is convenient for experimental personnel to operate. It will not cause inconvenience to operation or increase danger due to excessive forward leaning of the body due to excessive opening, nor will it affect the operating space and field of vision due to excessive opening, so that experimental personnel can carry out experimental operations comfortably and conveniently.

[0021] (6) Protect equipment and facilities: prevent the window from being opened too much and colliding with other equipment or facilities, avoid damage to the window itself, the fume hood cabinet and surrounding experimental equipment, extend the service life of the equipment, and reduce the cost of equipment maintenance and replacement.

[0022] (7) Standardize operating procedures: Clearly defined window opening height limits help standardize the operating behavior of laboratory personnel, cultivate good operating habits, comply with laboratory safety management regulations and standards, and improve the overall safety management level of the laboratory.

[0023] (8) Preventing window movement: Some limiting mechanisms can not only limit the opening height of the window, but also fix it in a set position after the window is opened, preventing the window from moving up and down due to external forces, airflow and other factors, ensuring the stability of the window and providing a stable environment for experimental operations. Attached Figure Description

[0024] Figure 1 This is an exploded view of the window opening height limiting mechanism in this embodiment;

[0025] Figure 2 This is a three-dimensional structural diagram of the window opening height limiting mechanism in this embodiment;

[0026] Figure 3 This is the front view of the window opening height limiting mechanism in this embodiment;

[0027] Figure 4 This is a schematic diagram of the front view of the fume hood in this embodiment;

[0028] Figure 5 This is a side view of the fume hood in this embodiment;

[0029] Figure 6 This is a schematic diagram of the internal structure of the fume hood in this embodiment;

[0030] Figure 7 This is a schematic diagram showing the limit switch of the viewing window in the limit position in this fume hood;

[0031] Figure 8 This is a schematic diagram showing the window limit switch in the retracted state in this fume hood.

[0032] The components include: 1. Window opening height limit mechanism; 2. Cabinet; 3. Window; 4. Window handle; 5. Front column; 6. Traction belt; 7. Transition pulley; 8. Counterweight.

[0033] 101. First fixed seat; 102. Second fixed seat; 103. Opening slot; 104. Viewing window limit switch; 105. Return spring; 106. Arc-shaped contact surface; 107. Shock-absorbing pad; 108. Limit fixing shaft. Detailed Implementation

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1:

[0037] like Figure 1-8As shown, a window opening height limiting mechanism includes a housing with an opening groove 103 inside. A window limit switch 104 is movably installed within the opening groove 103. The top of the window limit switch is hinged to the housing, and a return spring 105 is installed on the back of the window limit switch. A limiting protrusion protruding from the opening groove is installed on the window limit switch. When the return spring 105 is compressed, the limiting protrusion of the window limit switch retracts into the opening groove. The window opening height limiting mechanism precisely limits the opening height of the window, establishing a safe distance between laboratory personnel and hazardous substances inside the fume hood. This significantly reduces the risk of large-scale spillage of toxic and harmful gases, aerosols, and other substances, effectively reducing the probability of laboratory personnel coming into contact with harmful substances, comprehensively protecting the personal safety of laboratory personnel, effectively preventing safety accidents caused by chemical leaks, and building a solid safety barrier for the experimental environment.

[0038] As a preferred design, the housing includes a first fixed seat 101 and a second fixed seat 102 that interlock with each other. An opening slot 103 is formed within the first fixed seat, and the second fixed seat serves as a cover plate. The two are connected by multiple screws. This design greatly simplifies the installation process. During later maintenance and repair, only the screws need to be unscrewed to easily separate the two fixed seats and quickly access internal components such as the viewing window limit switch 104, significantly improving maintenance efficiency and reducing maintenance costs. Furthermore, the opening slot 103, located within the first fixed seat, provides precise and reasonable movement space for the viewing window limit switch 104, ensuring its stable operation.

[0039] As a preferred design, the limiting protrusion has a triangular structure, and the upper part of the limiting protrusion and the window handle have an arc-shaped contact surface 106. The limiting protrusion adopts a triangular structure, and the upper part that contacts the window handle has an arc-shaped contact surface 106. While effectively preventing the window from rising excessively, the arc design can greatly reduce friction wear on the window handle, extend the service life of the window handle and the limiting mechanism itself, and ensure that the window closes smoothly and smoothly, reducing jamming.

[0040] As a preferred design, a shock-absorbing pad 107 is installed at the top pressure position of the lower limit groove. When the viewing window handle pushes the viewing window limit switch 104 upward, causing it to touch the limit protrusion, the shock-absorbing pad can effectively buffer the impact force. This not only significantly reduces vibration and noise, avoiding interference with the experimental environment, but also effectively protects the viewing window limit switch 104, preventing it from being damaged by frequent impacts, thereby reducing damage to the fume hood cabinet, extending the overall service life of the fume hood, and improving the stability and comfort of equipment operation.

[0041] As a preferred design, a limiting shaft 108 is installed through the upper part of the viewing window limit switch on the housing, allowing the viewing window limit switch to rotate around the limiting shaft. This design ensures smooth and stable rotation of the viewing window limit switch, effectively guaranteeing the reliable implementation of the limit function. Simultaneously, the limiting shaft enhances the connection stability between the viewing window limit switch and the housing, ensuring that the limit mechanism maintains a good working condition during long-term, frequent use.

[0042] As a preferred design, the viewing window limit switch and the limit protrusion are integrally molded. This design ensures smooth and stable rotation of the viewing window limit switch, effectively guaranteeing the reliable implementation of the limit function. Simultaneously, the limit fixing shaft enhances the connection stability between the viewing window limit switch and the housing, ensuring that the limit mechanism maintains excellent working condition during long-term, frequent use.

[0043] A fume hood includes a cabinet body 2, a liftable viewing window 3 mounted on the cabinet body, a viewing window handle 4 mounted at the bottom of the viewing window, and a lifting drive mechanism mounted on the top of the cabinet body for raising and lowering the viewing window. The lifting drive mechanism includes a traction belt 6 and a transition pulley 7. The transition pulley is mounted on the top of the cabinet body, and its circumference is fitted with teeth that mate with the traction belt. The traction end of the traction belt is connected to the top of the viewing window, and the other end of the traction belt is connected to a counterweight 8. A mounting groove is provided on one side of the cabinet body corresponding to the viewing window. A viewing window opening height limiting mechanism 1 is installed in the mounting groove. When the limiting protrusion in the viewing window opening height limiting mechanism 1 is in the pop-out state, the viewing window handle interferes with the limit switch, preventing the viewing window from opening further upwards. The cabinet body includes a front column, and the viewing window opening height limiting mechanism is mounted on the front column 5 of the fume hood cabinet body. The placement of the viewing window opening height limiting mechanism on the front column 5 of the fume hood cabinet body is reasonable, facilitating installation and operation without affecting the normal operation of other components of the fume hood. When the limit protrusion pops out, the window handle interferes with the limit switch, rigidly preventing the window from opening beyond its height, thus strictly adhering to safety standards at the hardware level. The fume hood's lifting drive mechanism uses a traction belt and a transition pulley. The teeth on the circumference of the transition pulley precisely mesh with the traction belt, enabling precise control of the window's lifting and lowering. One end of the traction belt is connected to the top of the window, and the other end is connected to a counterweight. Utilizing the balancing effect of the counterweight, the window lifting and lowering process is more stable and effortless, significantly improving the convenience and smoothness of fume hood operation and comprehensively enhancing the overall performance of the fume hood.

[0044] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A window opening height limiting mechanism comprising a housing, characterised in that: An opening groove is provided inside the housing, and a viewing window limit switch is movably disposed in the opening groove. The top of the viewing window limit switch is hinged to the housing, and a return spring is provided on the back of the viewing window limit switch. The viewing window limit switch is provided with a limiting protrusion that protrudes outward from the opening groove. When the return spring is compressed, the limiting protrusion of the viewing window limit switch retracts into the opening groove.

2. The window opening height limiting mechanism according to claim 1, wherein: The housing includes a first fixed seat and a second fixed seat that are interlocked, and the opening slot is disposed in the first fixed seat.

3. The window opening height limiting mechanism according to claim 1, characterized in that: The limiting protrusion has a triangular structure, and the upper part of the limiting protrusion has an arc-shaped contact surface at the position where it mates with the window handle.

4. The window opening height limiting mechanism according to claim 1, characterized in that: A limiting shaft is provided through the upper part of the housing corresponding to the viewing window limit switch, and the viewing window limit switch rotates around the limiting shaft.

5. The window opening height limiting mechanism according to claim 1, characterized in that: The window limit switch and the limit protrusion are integrally formed.

6. A fume hood, comprising a cabinet body, characterized in that: The cabinet is provided with a liftable viewing window, a viewing window handle is provided at the bottom of the viewing window, and a lifting drive mechanism for driving the viewing window to rise and fall is provided at the top of the cabinet. A mounting groove is provided on the side of the cabinet corresponding to the viewing window, and a viewing window opening height limiting mechanism as described in any one of claims 1-5 is provided in the mounting groove. When the limiting protrusion in the viewing window opening height limiting mechanism is in the pop-out state, the viewing window handle interferes with the limiting switch, and the viewing window cannot continue to open upward.

7. A fume hood according to claim 6, characterized in that: The cabinet includes a front column, and the window opening height limiting mechanism is mounted on the front column.

8. A fume hood according to claim 6, characterized in that: The lifting drive mechanism includes a traction belt and a transition pulley. The transition pulley is located on the top of the cabinet. The circumferential surface of the transition pulley is provided with teeth that cooperate with the traction belt. The traction end of the traction belt is connected to the top of the viewing window, and the other end of the traction belt is connected to a counterweight.

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