Centralized gas supply system for laboratory

Abstract

The utility model belongs to the technical field of air supply, particularly relates to a laboratory central air supply system, and aims to solve the problems that a drainage pipeline of an existing ventilation cabinet and a ventilation system of a laboratory are tedious in connection step, inconvenient to connect and low in working efficiency, and the following scheme is provided: the laboratory central air supply system comprises an exhaust communicating pipe and an air inlet communicating pipe, the air exhaust communicating pipe and the air inlet communicating pipe are respectively fixed in the laboratory wall body and are used for exhausting air and feeding air, a variable air volume air supply butterfly valve is arranged in the air inlet communicating pipe, an electric closed valve is also arranged in the air inlet communicating pipe, the air inlet communicating pipe is communicated with the fresh air handling unit, and the air exhaust communicating pipe is communicated with the exhaust fan; the ventilation cabinet exhaust pipe and the communicating exhaust pipe are quickly connected and fixed through the connecting assembly, so that communication between the ventilation cabinet and the communicating exhaust pipe is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of gas supply, in particular to a laboratory central gas supply system. Background Art

[0002] Fume hoods are one of the important safety equipment in the laboratory. They are mainly used to exhaust toxic, harmful and odorous gases generated during the experiment, to protect the physical and mental health of the experimenters, and to create a comfortable and safe working environment. However, most of the existing fume hoods have a simple mechanical structure. The ventilation volume of the fan is fixed when working, and the ventilation volume will not be adjusted according to the size of the experimental operation door opening. This not only wastes electricity, but also often affects the experimental effect.

[0003] In the prior art, the air volume adjustment mode in the laboratory needs to be manually controlled, and the staff needs to manually adjust it according to the needs, which is inconvenient to use. At the same time, the steps for connecting the drainage pipe of the fume hood and the ventilation system of the laboratory are relatively cumbersome and inconvenient to connect, which reduces work efficiency. Summary of the invention

[0004] The utility model aims to solve the shortcomings in the prior art that the steps for connecting the drainage pipe of the fume hood and the ventilation system of the laboratory are complicated, inconvenient to connect, and reduce the working efficiency, and proposes a laboratory central air supply system.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A laboratory central air supply system, comprising an exhaust connecting pipe and an air inlet connecting pipe, the exhaust connecting pipe and the air inlet connecting pipe are respectively fixed in the laboratory wall for exhaust and air inlet, the air inlet connecting pipe is provided with a variable air volume air supply butterfly valve, the air inlet connecting pipe is also provided with an electric sealing valve, the air inlet connecting pipe is connected to a fresh air unit, and the exhaust connecting pipe is connected to an exhaust fan;

[0007] A differential pressure sensor, a temperature and humidity sensor, and a door position switch, wherein the differential pressure sensor and the temperature and humidity sensor are both arranged on the laboratory wall, the differential pressure sensor is used to detect the pressure inside the laboratory, the temperature and humidity sensor is used to detect the temperature and humidity inside the laboratory, and the door position switch is arranged on the wall of the laboratory near the door body to detect whether the laboratory door is closed;

[0008] At least two fume hoods, both of which are arranged in the laboratory, two connecting exhaust pipes are fixed on the exhaust connecting pipe, and variable air volume exhaust butterfly valves are arranged in the two connecting exhaust pipes, the two fume hoods are respectively connected with the two connecting exhaust pipes through connecting components, and a group of sealing components are arranged in the two connecting exhaust pipes, and the sealing components are used to maintain the sealing of the connecting exhaust pipe when the connecting exhaust pipe is not connected to the fume hoods, and a variable air volume auxiliary exhaust butterfly valve is arranged in the exhaust connecting pipe;

[0009] The room controller is fixed in the laboratory wall, a touch screen is provided on the side of the room controller, the room controller is electrically connected to the host computer, and the electric sealing valve, variable air volume supply butterfly valve, variable air volume auxiliary exhaust butterfly valve, two variable air volume exhaust butterfly valves, two fume hoods, differential pressure sensor, temperature and humidity sensor and door position switch are all electrically connected to the room controller.

[0010] In a possible design, an infrared sensor for detecting the number of people in the laboratory is provided on the laboratory wall, and the infrared sensor is electrically connected to the room controller.

[0011] In one possible design, the connecting assembly includes a fume hood exhaust pipe arranged on a fume hood body, the fume hood exhaust pipe and the side end of the connecting exhaust pipe match each other, the surfaces of the fume hood exhaust pipe and the connecting exhaust pipe are provided with the same external thread, the surface of the external thread is threadedly connected with a threaded ring for connecting the connecting exhaust pipe and the fume hood exhaust pipe, the initial position of the threaded ring is located on the surface of the connecting exhaust pipe, and the fume hood exhaust pipe is a corrugated pipe.

[0012] In a possible design, the sealing assembly includes a first hollow plate fixed in the connecting exhaust pipe, a limiting rod sliding in the first hollow plate, a sealing plate fixed to the side end of the limiting rod, a sealing ring fixed in the connecting exhaust pipe for sealing with the sealing plate, a spring fixed between the sealing plate and the first hollow plate, and the spring is sleeved on the surface of the limiting rod.

[0013] In a possible design, a first extrusion block is fixed to the bottom end of the sealing plate, a second extrusion block is fixed to one end of the second hollow plate close to the first extrusion block, and the second extrusion block is in contact with the first extrusion block.

[0014] In a possible design, an anti-slip sleeve is fixed on the surface of the threaded collar.

[0015] In the present application, after placing the fume hood body on the lower side of the connecting exhaust pipe, the fume hood exhaust pipe is pulled upward so that the fume hood exhaust pipe and the connecting exhaust pipe are aligned, and the threaded collar on the surface of the connecting exhaust pipe is twisted, and the threaded collar moves downward and is connected to the surfaces of the fume hood exhaust pipe and the connecting exhaust pipe at the same time, so that the positions of the fume hood exhaust pipe and the connecting exhaust pipe are fixed, and at the same time, the second extrusion block extrudes the first extrusion block, and the first extrusion block drives the sealing plate and the sealing ring to separate, so that the connecting exhaust pipe can be connected with the fume hood exhaust pipe;

[0016] When the connecting exhaust pipe is not connected to the exhaust pipe of the fume hood, the first extrusion block is not extruded, and the elasticity of the spring pushes the sealing plate to fit the sealing ring, so that the connecting exhaust pipe is in a sealed state.

[0017] In the utility model, the laboratory central air supply system can achieve the effect of quickly connecting the fume hood body with the exhaust pipe through the connecting component;

[0018] In the utility model, the laboratory central air supply system can achieve the effect of maintaining sealing when the connected exhaust pipe is not connected to the fume hood through the sealing component;

[0019] In the utility model, in the technical scheme, the fume hood exhaust pipe and the connecting exhaust pipe are quickly connected and fixed through a connecting component, so that the connection between the fume hood and the connecting exhaust pipe is more convenient. At the same time, the fume hood exhaust pipe is made of a corrugated pipe, which has a certain extensibility and can be adapted to connecting exhaust pipes of different heights for easy use. Through the sealing component, the connecting exhaust pipe can remain sealed when it is not connected to the fume hood body. Multiple connecting exhaust pipes can be set to prevent the subsequent addition of fume hoods, which is convenient for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a control flow chart of a laboratory central gas supply system proposed by the utility model;

[0021] Figure 2 A three-dimensional diagram of a fume hood in a laboratory central air supply system proposed by the utility model;

[0022] Figure 3 It is a first cross-sectional view of an exhaust duct of a fume hood in a laboratory central air supply system proposed by the utility model;

[0023] Figure 4 This is a second cross-sectional view of an exhaust duct of a fume hood in a laboratory central air supply system proposed by the utility model.

[0024] In the figure: 1. fume hood body; 2. anti-slip sleeve; 3. connecting exhaust pipe; 4. fume hood exhaust pipe; 5. threaded collar; 6. external thread; 7. first hollow plate; 8. limit rod; 9. spring; 10. sealing plate; 11. sealing ring; 12. first extrusion block; 13. second extrusion block; 14. second hollow plate. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Example 1

[0026] Reference Figure 1-Figure 4 , an air supply system, including an exhaust connecting pipe and an inlet connecting pipe, the exhaust connecting pipe and the inlet connecting pipe are respectively fixed in the laboratory wall for exhaust and air intake, a variable air volume air supply butterfly valve is arranged in the inlet connecting pipe, an electric sealing valve is also arranged in the inlet connecting pipe, the inlet connecting pipe is connected to the fresh air unit, and the exhaust connecting pipe is connected to the exhaust fan;

[0027] Differential pressure sensor, temperature and humidity sensor and door position switch. The differential pressure sensor and temperature and humidity sensor are all installed on the laboratory wall. The differential pressure sensor is used to detect the pressure inside the laboratory. The temperature and humidity sensor is used to detect the temperature and humidity inside the laboratory. The door position switch is installed on the wall of the laboratory near the door body to detect whether the laboratory door is closed;

[0028] At least two fume hoods 1, both of which are arranged in the laboratory, two connecting exhaust pipes 3 are fixed on the exhaust connecting pipe, and variable air volume exhaust butterfly valves are arranged in the two connecting exhaust pipes 3. The two fume hoods 1 are respectively connected to the two connecting exhaust pipes 3 through connecting components, and a group of sealing components are arranged in the two connecting exhaust pipes 3. The sealing components are used to maintain the sealing of the connecting exhaust pipes 3 when the connecting exhaust pipes 3 are not connected to the fume hoods 1, and a variable air volume auxiliary exhaust butterfly valve is arranged in the exhaust connecting pipe;

[0029] Room controller, the room controller is fixed in the laboratory wall, a touch screen is provided on the side of the room controller, the room controller is electrically connected to the host computer, the electric sealing valve, variable air volume supply butterfly valve, variable air volume auxiliary exhaust butterfly valve, two variable air volume exhaust butterfly valves, two fume hoods 1, differential pressure sensor, temperature and humidity sensor and door position switch are all electrically connected to the room controller;

[0030] An infrared sensor for detecting the number of people in the laboratory is provided on the laboratory wall, and the infrared sensor is electrically connected to the room controller;

[0031] The variable air volume control of the fume hood 1 is completed by the fume hood variable air volume system;

[0032] The fan frequency conversion control is controlled according to the pipeline static pressure, and the control cabinet has the fan manual frequency conversion switching and manual automatic switching functions;

[0033] The switch valve of the room air conditioning fresh air system is interlocked with the fan start and stop through the centralized control system. When the fan is started, the room fresh air switch valve is opened first and then the exhaust fan is turned on. The sequence is reversed when it is stopped.

[0034] Intelligent pattern recognition:

[0035] A. The working modes of the room include: working mode, non-working mode, night mode, emergency mode, and energy-saving mode. The room can be closed by a sealed valve when not in use. B. The room air supply adopts residual air volume control, and the supply air volume tracks the exhaust air volume changes and quickly follows the changes, which is completed by the supply and exhaust air variable air volume valve interlocking

[0036] C. The automatic switching between working mode, non-working mode and night mode can be set according to the preset timing.

[0037] D. When there is no one in the room, it can automatically switch to energy-saving low ventilation mode according to the detection of the room personnel sensor. In any case, it will automatically switch to working mode when there are people. It can identify the number of people according to the room personnel sensor and adjust the room ventilation frequency (not less than the minimum ventilation frequency) to meet the temperature and humidity requirements. When the air supply temperature and humidity are not enough to meet the needs, the unit temperature control requirements are weighted feedback. F. When the negative pressure in the room is too large or too small due to the adjustment of the ventilation frequency or other reasons (when the door is closed normally, the air supply volume difference can be automatically corrected to maintain the stability of the room airflow;

[0038] G, can be set to monitor the room door switch alarm status, can set timeout alarm;

[0039] The status parameters and operating conditions of each device in the room are uploaded to the central control management station through communication for monitoring;

[0040] The status parameters of the fresh air unit and the exhaust air unit are uploaded to the central control management station through communication for monitoring.

[0041] The sealing assembly includes a first hollow plate 7 fixed in the connecting exhaust pipe 3, a limiting rod 8 is slidably arranged in the first hollow plate 7, a sealing plate 10 is fixed to the side end of the limiting rod 8, a sealing ring 11 is fixed in the connecting exhaust pipe 3 and cooperates with the sealing plate 10 for sealing, a spring 9 is fixed between the sealing plate 10 and the first hollow plate 7, and the spring 9 is sleeved on the surface of the limiting rod 8; when the connecting exhaust pipe 3 is not connected to the exhaust pipe 4 of the fume hood, the first extrusion block 12 is not extruded, and the elasticity of the spring 9 pushes the sealing plate 10 to fit the sealing ring 11, so that the connecting exhaust pipe 3 is in a sealed state;

[0042] The connecting component includes a fume hood exhaust pipe 4 arranged on the fume hood body 1, the fume hood exhaust pipe 4 and the side end of the connecting exhaust pipe 3 match, the surfaces of the fume hood exhaust pipe 4 and the connecting exhaust pipe 3 are provided with the same external thread 6, the surface of the external thread 6 is threadedly connected with a threaded collar 5 for connecting the connecting exhaust pipe 3 and the fume hood exhaust pipe 4, the initial position of the threaded collar 5 is located on the surface of the connecting exhaust pipe 3, and the fume hood exhaust pipe 4 is a corrugated pipe; a first extrusion block 12 is fixed to the bottom end of the sealing plate 10, a second extrusion block 13 is fixed to the end of the second hollow plate 14 close to the first extrusion block 12, and the second extrusion block 13 and the first extrusion block The pressing block 12 contacts; after placing the fume hood body 1 on the lower side of the connecting exhaust pipe 3, the fume hood exhaust pipe 4 is pulled upward so that the fume hood exhaust pipe 4 and the connecting exhaust pipe 3 are aligned, and the threaded collar 5 on the surface of the connecting exhaust pipe 3 is screwed, and the threaded collar 5 moves downward and is connected to the surfaces of the fume hood exhaust pipe 4 and the connecting exhaust pipe 3 at the same time, fixing the positions of the fume hood exhaust pipe 4 and the connecting exhaust pipe 3, and at the same time the second extrusion block 13 extrudes the first extrusion block 12, and the first extrusion block 12 drives the sealing plate 10 and the sealing ring 11 to separate, so that the connecting exhaust pipe 3 can be connected with the fume hood exhaust pipe 4;

[0043] The present application can be used for central gas supply in laboratories, and can also be used in other fields suitable for the present application. Example 2

[0044] refer to Figure 2-Figure 4 , improved on the basis of Example 1: a laboratory central gas supply system, which is used in the field of laboratory centralized gas supply technology, and a non-slip sleeve 2 is fixed on the surface of the threaded ring 5.

[0045] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A laboratory central gas supply system, characterized in that: include: An exhaust connecting pipe and an air inlet connecting pipe, the exhaust connecting pipe and the air inlet connecting pipe are respectively fixed in the laboratory wall for exhaust and air inlet, the air inlet connecting pipe is provided with a variable air volume air supply butterfly valve, the air inlet connecting pipe is also provided with an electric sealing valve, the air inlet connecting pipe is connected to the fresh air unit, and the exhaust connecting pipe is connected to the exhaust fan; A differential pressure sensor, a temperature and humidity sensor, and a door position switch, wherein the differential pressure sensor and the temperature and humidity sensor are both arranged on the laboratory wall, the differential pressure sensor is used to detect the pressure inside the laboratory, the temperature and humidity sensor is used to detect the temperature and humidity inside the laboratory, and the door position switch is arranged on the wall of the laboratory near the door body to detect whether the laboratory door is closed; At least two fume hoods (1), both of which are arranged in a laboratory, two communicating exhaust pipes (3) are fixed on the exhaust connecting pipe, both communicating exhaust pipes (3) are provided with variable air volume exhaust butterfly valves, the two fume hoods (1) are respectively connected to the two communicating exhaust pipes (3) through a connecting assembly, both communicating exhaust pipes (3) are provided with a group of sealing assemblies, the sealing assemblies are used to maintain the sealing of the communicating exhaust pipes (3) when the communicating exhaust pipes (3) are not connected to the fume hoods (1), and the exhaust connecting pipes are provided with variable air volume auxiliary exhaust butterfly valves; A room controller is fixed in the laboratory wall, a touch screen is provided on the side of the room controller, the room controller is electrically connected to a host computer, and the electric sealing valve, the variable air volume supply butterfly valve, the variable air volume auxiliary exhaust butterfly valve, two variable air volume exhaust butterfly valves, two fume hoods (1), a pressure difference sensor, a temperature and humidity sensor and a door position switch are all electrically connected to the room controller.

2. A laboratory central gas supply system according to claim 1, characterized in that: An infrared sensor for detecting the number of people in the laboratory is arranged on the laboratory wall, and the infrared sensor is electrically connected to the room controller.

3. A laboratory central gas supply system according to any one of claims 1-2, characterized in that: The connection assembly comprises a fume hood exhaust pipe (4) arranged on a fume hood body (1); the fume hood exhaust pipe (4) and the side ends of the connecting exhaust pipe (3) match each other; the surfaces of the fume hood exhaust pipe (4) and the connecting exhaust pipe (3) are provided with a same external thread (6); the surface of the external thread (6) is threadedly connected with a threaded collar (5) for connecting the connecting exhaust pipe (3) and the fume hood exhaust pipe (4); the initial position of the threaded collar (5) is located on the surface of the connecting exhaust pipe (3); and the fume hood exhaust pipe (4) is a corrugated pipe.

4. A laboratory central gas supply system according to claim 3, characterized in that: The sealing assembly comprises a first hollow plate (7) and a second hollow plate (14) fixed in the connecting exhaust pipe (3); a limit rod (8) is slidably arranged in the first hollow plate (7); a sealing plate (10) is fixed to the side end of the limit rod (8); a sealing ring (11) is fixed in the connecting exhaust pipe (3) and cooperates with the sealing plate (10) for sealing; a spring (9) is fixed between the sealing plate (10) and the first hollow plate (7); and the spring (9) is sleeved on the surface of the limit rod (8).

5. A laboratory central gas supply system according to claim 4, characterized in that: A first extrusion block (12) is fixed to the bottom end of the sealing plate (10), and a second extrusion block (13) is fixed to one end of the second hollow plate (14) close to the first extrusion block (12), wherein the second extrusion block (13) is in contact with the first extrusion block (12).

6. A laboratory central gas supply system according to claim 3, characterized in that: An anti-slip sleeve (2) is fixed on the surface of the threaded collar (5).

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