Control system for automatically adjusting air volume and air flow in laboratory

Abstract

The utility model discloses a control system for automatically adjusting air volume and air flow in a laboratory, which relates to the technical field of laboratory air exhaust and comprises a laboratory, a control terminal, an experimental ventilation cabinet arranged in the laboratory, a pressure difference adjusting mechanism and a waste gas treatment mechanism. The pressure difference adjusting mechanism comprises a pressure difference sensor used for detecting the pressure difference inside and outside the laboratory, an air inlet pipe and a fresh air fan, the laboratory is provided with an air inlet and an air outlet, the fresh air fan is fixedly arranged outside the laboratory, one end of the air inlet pipe is communicated with the output end of the fresh air fan, and the other end of the air inlet pipe is communicated with the air inlet; the differential pressure sensor and the fresh air ventilator are both electrically connected with the control terminal, and the working state of the fresh air ventilator is controlled through signals fed back by the differential pressure sensor, so that the amount of fresh air entering the laboratory is automatically adjusted, it is ensured that the air pressure in the laboratory is stable, and the problem of air circulation caused by excessive or insufficient fresh air supply is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory exhaust, and particularly relates to a control system for automatically adjusting the air volume and air flow in a laboratory. Background Art

[0002] The exhaust system in a laboratory is connected to multiple experimental fume hoods through pipes, and is used to keep the fume hood in a negative pressure state during experiments and discharge the waste gas and poisonous gas in the experimental fume hood outdoors. The fresh air unit is used to supply fresh air to the laboratory. Since the pipes are connected to multiple experimental fume hoods, the exhaust air volume cannot be controlled according to the concentration of waste gas and poisonous gas in any experimental fume hood during experiments, which easily leads to the inability to quickly discharge the waste gas and poisonous gas and pollute the laboratory.

[0003] In the prior art solution, the Chinese patent with the authorization announcement number CN218884182U discloses a laboratory exhaust system, including multiple experimental fume hoods arranged in the laboratory; exhaust branch pipes are arranged on the exhaust ports of the multiple experimental fume hoods; an air volume electric control regulating valve is arranged between the exhaust branch pipe and the exhaust port of the experimental fume hood. While maintaining and controlling the laboratory in a negative pressure environment, the exhaust air volume of any experimental fume hood can be automatically controlled according to the actual concentration of waste gas and poisonous gas, preventing pollution leakage and ensuring the safety of experimental personnel.

[0004] The deficiencies of the above prior art solution are as follows: when the experimental personnel adjust the opening degree of the sliding door of the fume hood or close the fume hood according to the experimental requirements, the exhaust air volume of the fume hood will correspondingly decrease. However, if the air volume of the fresh air unit in the laboratory still remains constant at this time and does not make corresponding adjustments according to the change of the exhaust air volume, it will lead to an excess supply of fresh air indoors. This situation of excess fresh air will not only cause waste of energy, but also may affect the stability of environmental parameters such as temperature and humidity in the laboratory, and further have an adverse impact on the accuracy of experimental results and the normal operation of experimental equipment. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a control system for automatically adjusting the air volume and air flow in a laboratory, so as to solve the technical problem in the prior art that no corresponding adjustment is made according to the change of the exhaust air volume, resulting in an excess supply of fresh air indoors.

[0006] The technical problem to be solved by the utility model can be achieved through the following technical solutions: A control system for automatically adjusting the air volume and air flow in a laboratory, including a laboratory, a control terminal, an experimental fume hood arranged in the laboratory, a differential pressure regulating mechanism, and an exhaust gas treatment mechanism. The differential pressure regulating mechanism includes a differential pressure sensor for detecting the differential pressure inside and outside the laboratory, an air inlet pipe, and a fresh air fan. The laboratory is provided with an air inlet and an air outlet. The fresh air fan is fixedly arranged outside the laboratory. One end of the air inlet pipe is communicated with the output end of the fresh air fan, and the other end of the air inlet pipe is communicated with the air inlet. The differential pressure sensor and the fresh air fan are both electrically connected to the control terminal. The exhaust gas treatment mechanism includes an exhaust fan, an exhaust pipe, an electronically controlled regulating valve, and a gas sensor for detecting the exhaust gas concentration in real time. The exhaust fan is fixedly arranged outside the laboratory. One end of the exhaust pipe is communicated with the input end of the exhaust fan, and the other end of the exhaust pipe is communicated with the experimental fume hood. The electronically controlled regulating valve and the gas sensor are arranged in the exhaust pipe. The exhaust fan, the electronically controlled regulating valve, and the first gas sensor are all electrically connected to the control terminal.

[0007] As a further scheme of the utility model: The differential pressure regulating mechanism further includes a filter. At least two groups of filters are provided, and all the filters are arranged in parallel at the input end of the fresh air fan.

[0008] As a further scheme of the utility model: The differential pressure regulating mechanism further includes electronically controlled valves. A plurality of electronically controlled valves are provided and arranged between the corresponding filters and the fresh air fan. The electronically controlled valves are electrically connected to the control terminal.

[0009] As a further scheme of the utility model: The differential pressure sensor includes a first detection end and a second detection end. The first detection end is arranged outside the laboratory for detecting the outdoor pressure of the laboratory, and the second detection end is arranged inside the laboratory for detecting the indoor pressure of the laboratory.

[0010] As a further scheme of the utility model: An insect-proof net is provided at the output end of the exhaust fan.

[0011] As a further scheme of the utility model: The exhaust fan is a variable-frequency centrifugal fan.

[0012] The beneficial effects of the utility model compared with the prior art are:

[0013] 1. By the signal fed back by the differential pressure sensor, the working state of the fresh air fan is controlled, so as to automatically adjust the fresh air volume entering the laboratory, ensure the stability of the internal air pressure of the laboratory, and avoid air circulation problems caused by excessive or insufficient fresh air supply.

[0014] 2. The gas sensor installed in the exhaust duct monitors the waste gas concentration in real time, and automatically adjusts the opening degree of the electronically controlled regulating valve according to the concentration change, effectively controlling the emission rate and emission amount of the waste gas, reducing energy consumption and emission costs while ensuring the waste gas treatment effect.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0017] Figure 1 is a schematic structural diagram of a control system for automatically adjusting the air volume and air flow in a laboratory.

[0018] Figure 2 is a schematic structural diagram of the differential pressure regulating mechanism in the present utility model.

[0019] Figure 3 is a schematic diagram of being electrically connected to a control terminal in the present utility model.

[0020] The reference numerals include:

[0021] 1. Laboratory; 11. Air inlet; 12. Air outlet; 2. Control terminal; 3. Laboratory fume hood; 4. Differential pressure regulating mechanism; 41. Differential pressure sensor; 42. Air inlet pipe; 43. Fresh air blower; 44. Filter; 45. Electric control valve; 46. First detection end; 47. Second detection end; 5. Waste gas treatment mechanism; 51. Exhaust fan; 52. Exhaust duct; 53. Electronically controlled regulating valve; 54. Gas sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.

[0023] Such as Figures 1 to 3As shown in the figure, a control system for automatically adjusting the air volume and air flow in a laboratory includes a laboratory 1, a control terminal 2, an experimental fume hood 3 arranged in the laboratory 1, a differential pressure regulating mechanism 4 and an exhaust gas treatment mechanism 5. The differential pressure regulating mechanism 4 includes a differential pressure sensor 41 for detecting the differential pressure inside and outside the laboratory 1, an air inlet pipe 42 and a fresh air blower 43. The laboratory 1 is provided with an air inlet 11 and an air outlet 12. The fresh air blower 43 is fixedly arranged outside the laboratory 1. One end of the air inlet pipe 42 is communicated with the output end of the fresh air blower 43, and the other end of the air inlet pipe 42 is communicated with the air inlet 11. The differential pressure sensor 41 and the fresh air blower 43 are both electrically connected to the control terminal 2. Specifically, the differential pressure sensor 41 includes a first detection end 46 and a second detection end 47. The first detection end 46 is arranged outside the laboratory 1 for detecting the outdoor pressure of the laboratory 1, and the second detection end 47 is arranged inside the laboratory 1 for detecting the indoor pressure of the laboratory 1.

[0024] Through the signal fed back by the differential pressure sensor 41, the working state of the fresh air blower 43 is controlled, so as to automatically adjust the fresh air volume entering the laboratory 1, ensure the stability of the internal air pressure of the laboratory 1, and avoid air circulation problems caused by excessive or insufficient fresh air supply.

[0025] Specifically, when the differential pressure inside and outside the laboratory 1 changes, the differential pressure sensor 41 detects this change and transmits the signal to the control terminal 2. The control terminal 2 calculates the fresh air volume that needs to be adjusted according to the preset differential pressure range, and sends an instruction to the fresh air blower 43. The fresh air blower 43 adjusts its working state according to the received instruction, and conveys a corresponding amount of fresh air into the laboratory 1 through the air inlet pipe 42, so as to restore the balance of the differential pressure inside and outside the laboratory 1.

[0026] The exhaust gas treatment mechanism 5 includes an exhaust fan 51, an exhaust pipe 52, an electric control regulating valve 53 and a gas sensor 54 for real-time detection of the exhaust gas concentration. The exhaust fan 51 is fixedly arranged outside the laboratory 1. One end of the exhaust pipe 52 is communicated with the input end of the exhaust fan 51, and the other end of the exhaust pipe 52 is communicated with the experimental fume hood 3. The electric control regulating valve 53 and the gas sensor 54 are arranged in the exhaust pipe 52. The exhaust fan 51, the electric control regulating valve 53 and the first gas sensor 54 are all electrically connected to the control terminal 2.

[0027] The gas sensor 54 arranged in the exhaust pipe 52 is used to monitor the exhaust gas concentration in real time, and the opening degree of the electric control regulating valve 53 is automatically adjusted according to the concentration change, so as to effectively control the exhaust gas emission rate and emission amount, reduce energy consumption and emission costs while ensuring the exhaust gas treatment effect.

[0028] Specifically, the waste gas generated during the experiment is collected by the experimental fume hood 3 and then enters the exhaust duct 52. The gas sensor 54 installed in the exhaust duct 52 monitors the concentration of the waste gas in real time and sends the data to the control terminal 2. The control terminal 2 automatically adjusts the opening degree of the electronically controlled regulating valve 53 installed on the exhaust duct 52 according to the level of the waste gas concentration. When the waste gas concentration is high, the electronically controlled regulating valve 53 opens wider to increase the waste gas emission rate; when the waste gas concentration drops to the safe range, the electronically controlled regulating valve 53 closes correspondingly to reduce the emission rate, thereby achieving effective control of the waste gas emission.

[0029] In some specific implementation embodiments, the differential pressure regulating mechanism 4 further includes filters 44 and electronically controlled valves 45. There are at least two groups of filters 44, and all the filters 44 are arranged in parallel at the input end of the fresh air blower 43. There are multiple electronically controlled valves 45, and they are arranged between the corresponding filters 44 and the fresh air blower 43. The electronically controlled valves 45 are electrically connected to the control terminal 2.

[0030] The filter 44 is arranged at the input end of the fresh air blower 43 and is used for pre-treating the air to remove impurities such as dust and particulate matter therein, ensuring the quality of the fresh air entering the laboratory 1.

[0031] When it is necessary to clean or replace the filter 44, the connection between the filter 44 and the fresh air blower 43 can be cut off by closing the corresponding electronically controlled valve 45, and at the same time, the electronically controlled valves 45 of other filters 44 are opened to realize flexible switching of the filters 44, thereby ensuring the continuity and reliability of the system.

[0032] In some specific implementation embodiments, an insect-proof net is provided at the output end of the exhaust fan 51.

[0033] The exhaust system of the laboratory 1, especially during the waste gas emission process, may attract some insects or small sundries. If these insects or sundries enter the interior of the exhaust system, it may cause pipeline blockage, equipment damage or affect the waste gas treatment effect. Therefore, setting an insect-proof net at the output end of the exhaust fan 51 can effectively block these insects and sundries from entering the exhaust system and protect the normal operation of the system.

[0034] In some specific implementation embodiments, the exhaust fan 51 is a variable-frequency centrifugal fan.

[0035] In the laboratory 1, the amount of waste gas generated may change during the experiment. The exhaust fan 51 can ensure that the waste gas is discharged in a timely and effective manner, and at the same time avoid energy waste caused by excessive emission.

[0036] To facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of the embodiments of this solution is described below in combination with a specific application scenario:

[0037] When the pressure difference inside and outside Laboratory 1 changes, the pressure difference sensor 41 detects this change and transmits a signal to the control terminal 2. The control terminal 2 calculates the required fresh air volume to be adjusted according to the preset pressure difference range and sends an instruction to the fresh air fan 43. The fresh air fan 43 adjusts its working state according to the received instruction and conveys a corresponding amount of fresh air into Laboratory 1 through the air inlet pipe 42, thereby restoring the balance of the pressure difference inside and outside Laboratory 1.

[0038] The waste gas generated during the experiment is collected by the experimental fume hood 3 and then enters the exhaust pipe 52. The gas sensor 54 installed in the exhaust pipe 52 monitors the concentration of the waste gas in real time and sends the data to the control terminal 2. The control terminal 2 automatically adjusts the opening degree of the electronically controlled regulating valve 53 installed on the exhaust pipe 52 according to the level of the waste gas concentration. When the waste gas concentration is high, the electronically controlled regulating valve 53 opens wider to increase the waste gas emission rate; when the waste gas concentration drops to the safe range, the electronically controlled regulating valve 53 closes correspondingly to reduce the emission rate, thereby achieving effective control of the waste gas emission.

[0039] When it is necessary to clean or replace the filter 44, the connection between the filter 44 and the fresh air fan 43 can be cut off by closing the corresponding electronically controlled valve 45. At the same time, the electronically controlled valves 45 of other filters 44 are opened to achieve flexible switching of the filters 44, thereby ensuring the continuity and reliability of the system.

[0040] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claimed rights.

Claims

1. A control system for automatically adjusting the air volume and air flow in a laboratory, comprising a control terminal (2) and an experimental fume hood (3) arranged in the laboratory (1), characterized in that, Further included are: A differential pressure regulating mechanism (4), the differential pressure regulating mechanism (4) includes a differential pressure sensor (41) for detecting the differential pressure inside and outside the laboratory (1), an air inlet pipe (42) and a fresh air fan (43). The laboratory (1) is provided with an air inlet (11) and an air outlet (12). The fresh air fan (43) is fixedly arranged outside the laboratory (1). One end of the air inlet pipe (42) is communicated with the output end of the fresh air fan (43), and the other end of the air inlet pipe (42) is communicated with the air inlet (11). The differential pressure sensor (41) and the fresh air fan (43) are both electrically connected to the control terminal (2); An exhaust gas treatment mechanism (5), the exhaust gas treatment mechanism (5) includes an exhaust fan (51), an exhaust duct (52), an electrically controlled regulating valve (53) and a gas sensor (54) for detecting the exhaust gas concentration in real time. The exhaust fan (51) is fixedly arranged outside the laboratory (1). One end of the exhaust duct (52) is communicated with the input end of the exhaust fan (51), and the other end of the exhaust duct (52) is communicated with the experimental fume hood (3). The electrically controlled regulating valve (53) and the gas sensor (54) are arranged in the exhaust duct (52). The exhaust fan (51), the electrically controlled regulating valve (53) and the first gas sensor (54) are all electrically connected to the control terminal (2).

2. The control system for automatically adjusting the air volume and air flow in a laboratory according to claim 1, wherein The differential pressure regulating mechanism (4) further includes filters (44). At least two groups of filters (44) are provided, and all the filters (44) are arranged in parallel at the input end of the fresh air fan (43).

3. The control system for automatically adjusting the air volume and air flow in a laboratory according to claim 2, wherein, The differential pressure regulating mechanism (4) further includes electrically controlled valves (45). A plurality of electrically controlled valves (45) are provided and are arranged between the corresponding filters (44) and the fresh air fan (43). The electrically controlled valves (45) are electrically connected to the control terminal (2).

4. A control system for automatically adjusting the air volume and air flow in a laboratory according to claim 1, characterized in that, The differential pressure sensor (41) includes a first detection end (46) and a second detection end (47). The first detection end (46) is arranged outside the laboratory (1) for detecting the outdoor pressure of the laboratory (1), and the second detection end (47) is arranged inside the laboratory (1) for detecting the indoor pressure of the laboratory (1).

5. The control system for automatically adjusting the air volume and air flow in a laboratory according to claim 1, characterized in that, An insect-proof net is provided at the output end of the exhaust fan (51).

6. The control system for automatically adjusting the air volume and air flow in a laboratory according to claim 1, wherein The exhaust fan (51) is a variable-frequency centrifugal fan.

Images