Laboratory multi-room pressure gradient controller

Abstract

The utility model relates to a laboratory multi-room pressure gradient controller, which comprises a plurality of laboratories, a pressure gradient controller, a control screen, ventilation equipment, an absolute pressure difference sensor and a relative pressure difference sensor are arranged in each laboratory, and the control screen is in electric signal connection with the pressure gradient controller. The absolute pressure difference sensor and the relative pressure difference sensor are respectively in electric signal connection with a detection data input end of the pressure gradient controller, the ventilation equipment is in electric signal connection with a control signal output end of the pressure gradient controller, three air pipes are arranged on the pressure gradient controller, a first air pipe is connected with a room of a previous laboratory, and a second air pipe is connected with a second laboratory; the second air pipe is connected with the laboratory, the third air pipe is connected with the atmosphere, a multi-way pipe is arranged on the second air pipe, one branch pipe on the first air pipe and one branch pipe on the second air pipe are connected with a relative differential pressure sensor, and the other branch pipe on the second air pipe and the third air pipe are connected with an absolute differential pressure sensor. According to the utility model, the regulation efficiency and the control precision of the laboratory pressure can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laboratory pressure equipment technical field, especially in a kind of laboratory multi-room pressure gradient controller. BACKGROUND

[0002] Laboratory pressure control is the key to ensure normal experimental environment, and the existing laboratory pressure control scheme usually adopts ventilation system to realize, respectively set pressure sensor in multiple laboratories, detect the air pressure in laboratory by pressure sensor, then adjust fan to adjust the air pressure in laboratory.And in some special laboratories, the air pressure gradient of multiple different laboratories needs to be controlled, in this case, there are two implementation ways in prior art, the first way is to set air pressure sensor in each laboratory, detect the difference between indoor air pressure and outdoor atmospheric pressure by air pressure sensor, and then obtain the indoor air pressure value, and adjust the air pressure value in each laboratory by this way.The disadvantage of this scheme is that the setting method of pressure sensor uses the difference between indoor pressure and atmospheric pressure, but the outdoor atmospheric pressure may fluctuate due to the different locations of each laboratory, especially for the case that the laboratories are far apart, the atmospheric pressure may be disturbed by outdoor environment, thus this control method has poor accuracy, and it is difficult to make the air pressure value of each room truly reach the preset gradient difference.The second way is to set connecting pipe between adjacent laboratories, and set differential pressure sensor on the connecting pipe to detect the relative air pressure of two laboratories, and adjust the ventilation equipment in laboratory to make the air pressure difference of two laboratories reach the preset air pressure gradient.The disadvantage of this method is that for the case that the number of laboratories is relatively large, if the air pressure of one laboratory is adjusted, it will lead to the chain change of the pressure difference between this laboratory and other laboratories, and the ventilation equipment of other laboratories also needs to be adjusted in sequence to make the pressure difference between these laboratories reach the preset gradient value, so this way is not convenient for the air pressure adjustment of each laboratory, and the efficiency of air pressure adjustment is very low, thus the existing laboratory pressure control system needs to be improved. UTILITY MODEL CONTENTS

[0003] The utility model discloses a kind of laboratory multi-room pressure gradient controllers, to solve the problem that the existing laboratory air pressure control system uses the difference between indoor air pressure and outdoor atmospheric pressure to set the air pressure gradient of laboratory, poor accuracy;And adjacent laboratory is connected with air pipe, the air pressure difference of adjacent laboratory is used to set the air pressure gradient of laboratory, not convenient for the air pressure value of each laboratory is set.

[0004] To achieve the above object, the utility model is realized by the following technical solutions:

[0005] The application discloses a laboratory multi-room pressure gradient controller, which comprises a plurality of laboratories, a pressure gradient controller, a control screen, a ventilation device, an absolute pressure difference sensor and a relative pressure difference sensor arranged in each laboratory, the control screen is electrically connected with the electric signal of the pressure gradient controller, the absolute pressure difference sensor and the relative pressure difference sensor are electrically connected with the detection data input end of the pressure gradient controller respectively, the ventilation device is electrically connected with the control signal output end of the pressure gradient controller, three air pipes are arranged on the pressure gradient controller, a first air pipe is connected with a room of an upper laboratory, a second air pipe is connected with the laboratory, and a third air pipe is connected with the atmosphere, a plurality of through pipes are arranged on the second air pipe, a branch pipe on the first air pipe and the second air pipe is connected with the relative pressure difference sensor, and another branch pipe on the second air pipe and the third air pipe are connected with the absolute pressure difference sensor.

[0006] In the above scheme, the access control signal sensor is electrically connected with the pressure gradient controller. Through the arrangement, the access control signal sensor detects the opening signal of the laboratory, when the laboratory is opened, the access control signal sensor sends a signal to the pressure gradient controller, the pressure gradient controller delays for a certain time, and then controls the ventilation device of the laboratory to adjust the air pressure of the laboratory, so that the air pressure of the laboratory returns to the air pressure value before the laboratory is opened. Through the arrangement, only the air pressure of the laboratory which is opened needs to be adjusted, and the air pressure of the other laboratories does not need to be adjusted, so that the cascading change of the air pressure of the laboratory can be effectively prevented, and the air pressure of each laboratory needs to be adjusted again.

[0007] In the above scheme, the ventilation device comprises a fan and an exhaust device. The ventilation device can be selected according to the requirement. The fan can directly blow air to the laboratory to increase the air pressure in the laboratory, and the exhaust device can control the exhaust amount of the laboratory through a variable air volume valve to decrease the air pressure in the laboratory.

[0008] In the above scheme, the control screen communicates with the pressure gradient controller through an RS485 bus. Through the arrangement, the control screen can communicate with the pressure gradient controller in a bidirectional mode. The absolute air pressure value can be set on the control screen, and the set absolute air pressure value data is sent to the pressure gradient controller. The pressure gradient controller sends a signal to the ventilation device according to the set absolute air pressure value to control the work of the ventilation device. Meanwhile, the air pressure data detected by the relative pressure difference sensor and the absolute pressure difference sensor can also be sent to the control screen and displayed on the control screen.

[0009] It should be noted that, although the pressure gradient controller, control screen and other devices are used in the utility model, corresponding software support is needed when these devices are running, but these software only involves simple sensor data acquisition, difference calculation, control signal transmission, and fan opening adjustment control software, and these control software all belong to the prior art, so the utility model does not involve the improvement of software or method.

[0010] The utility model has the positive effect: the laboratory multi-room pressure gradient controller of the utility model, pressure gradient controller, control screen, ventilation equipment, absolute pressure difference sensor and relative pressure difference sensor are arranged in each laboratory respectively, the relative value of the laboratory air pressure and atmospheric pressure, namely absolute air pressure, is detected through the absolute pressure difference sensor, the air pressure difference value between adjacent laboratories, namely relative air pressure, is detected through the relative pressure difference sensor, when adjusting, the air pressure gradient of each laboratory can be first set, the absolute air pressure on the control screen of each laboratory is set first, after the air pressure of each laboratory reaches the absolute air pressure, the absolute air pressure value set on the control screen is adjusted according to the relative air pressure, so that the relative air pressure between each laboratory reaches the preset difference value, through this setting, the air pressure of each laboratory can be conveniently adjusted, the air pressure adjustment efficiency is improved, and the accuracy of the air pressure gradient between each laboratory is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the structural schematic diagram of the laboratory multi-room pressure gradient controller of the utility model.

[0012] The reference numerals in the drawing are, pressure gradient controller 1, control screen 2, ventilation equipment 3, absolute pressure difference sensor 4, relative pressure difference sensor 5, laboratory 6, access control 7, first air pipe 8, second air pipe 9, third air pipe 10. DETAILED DESCRIPTION

[0013] The technical scheme of the utility model will be described clearly and completely in the following through embodiments, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the protection scope of the utility model.

[0014] As Figure 1 The laboratory multi-room pressure gradient controller of the utility model, it includes a plurality of laboratories 6, pressure gradient controller 1, control screen 2, ventilation equipment 3, absolute pressure difference sensor 4 and relative pressure difference sensor 5 are arranged in each laboratory 6.

[0015] The control screen 2 can be a control screen arranged on the wall of each laboratory, and the control screen 2 communicates with the pressure gradient controller 1 through an RS485 bus; or can be a mobile phone, a PAD or the like, and an APP is installed in the mobile phone, the PAD or the like, and the mobile phone, the PAD or the like communicates with the pressure gradient controller 1 through Bluetooth. The control screen 2 is electrically connected with the pressure gradient controller 1, and an absolute pressure value can be set on the control screen 2, and data detected by the absolute pressure difference sensor 4 and the relative pressure difference sensor 5 can be displayed.

[0016] The pressure gradient controller 1 can adopt a controller of an existing ventilation equipment 3. The absolute pressure difference sensor 4 and the relative pressure difference sensor 5 are electrically connected with the detection data input end of the pressure gradient controller 1, and the ventilation equipment 3 is electrically connected with the control signal output end of the pressure gradient controller 1.

[0017] The ventilation equipment 3 comprises a fan and an exhaust equipment. The ventilation equipment 3 can be selected according to requirements, and the fan can directly blow air to the laboratory to increase the air pressure in the laboratory, and the exhaust equipment can control the exhaust amount of the laboratory through a variable air volume valve to decrease the air pressure in the laboratory.

[0018] Three air pipes are arranged on the pressure gradient controller 1, a first air pipe 8 is connected with a room of a laboratory 6, a second air pipe 9 is connected with the laboratory, and a third air pipe 10 is connected with the atmosphere, a plurality of pipes are arranged on the second air pipe 9, for example, a one-to-two air pipe adapter can be adopted, a branch pipe of the first air pipe 8 and the second air pipe 9 is connected with the relative pressure difference sensor 5, and is used for detecting the air pressure difference between two adjacent laboratories 6, i.e. the relative air pressure, and the other branch pipe of the second air pipe 9 and the third air pipe 10 are connected with the absolute pressure difference sensor 4, and are used for detecting the air pressure difference between the laboratory 6 and the atmosphere, i.e. the absolute air pressure.

[0019] The laboratory multi-room pressure gradient controller can adjust the air pressure gradient of a plurality of laboratories, and can set the absolute air pressure of each laboratory on the control screen according to the initial absolute air pressure and the air pressure gradient of each laboratory, then the data is transmitted to the pressure gradient controller of each laboratory, the pressure gradient controller controls the ventilation equipment in each laboratory, the ventilation equipment ventilates or exhausts air in the laboratory according to the set pressure value, the absolute air pressure of the laboratory changes to the set value, if the relative air pressure between adjacent laboratories reaches the set gradient value, the absolute air pressure of the laboratory can be kept unchanged, if the relative air pressure of adjacent laboratories is inconsistent with the set gradient value, the absolute air pressure is adjusted according to the difference, and the data of the air pressure difference between the plurality of laboratories reaches the required air pressure gradient value.

[0020] Because all the laboratories are provided with access control, when the access control of the laboratory is opened, the air pressure in the laboratory will change, if the ventilation equipment starts to blow air into the laboratory or exhaust air outside the laboratory at this time, because the ventilation equipment of each laboratory is controlled by the pressure gradient controller, so that the air pressure of each laboratory will have a chain reaction, after the access control of the laboratory is closed, all the laboratories need to be re-adjusted to the air pressure to reach the preset air pressure gradient value. Therefore, as a preferred embodiment, the access control signal sensor 7 is further included, and the access control signal sensor 7 is in electrical signal connection with the pressure gradient controller 1. Through the arrangement, the access control signal sensor detects the opening signal of the laboratory, when the laboratory is opened, the access control signal sensor 7 sends a signal to the pressure gradient controller 1, the pressure gradient controller 1 delays for a certain period of time, and then controls the ventilation equipment 3 of the laboratory 6 to adjust the air pressure of the laboratory 6, so that the air pressure of the laboratory 6 returns to the air pressure value before the door is opened. Through the arrangement, only the air pressure of the laboratory opened needs to be adjusted, and the air pressure of the remaining laboratories does not need to be adjusted, which can effectively prevent the air pressure of the laboratory from changing in a chain and re-adjusting the air pressure of each laboratory.

[0021] The laboratory multi-room pressure gradient controller of the utility model not only can be used in the laboratory, but also can be used in other scenes needing air pressure gradient control, for example, can also be applied to the clean room, and this application also belongs to the protection range of the utility model.

[0022] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the range of the utility model is defined by the appended claims and its equivalents.

Claims

1. A laboratory multi-room pressure gradient controller, characterized by, It includes a plurality of laboratories, provided with a pressure gradient controller, a control screen, a ventilation device, an absolute pressure difference sensor and a relative pressure difference sensor in each laboratory, the control screen is connected with the electrical signal of the pressure gradient controller, the absolute pressure difference sensor and the relative pressure difference sensor are respectively connected with the detection data input end of the pressure gradient controller, the ventilation device is connected with the control signal output end of the pressure gradient controller, three air pipes are provided on the pressure gradient controller, the first air pipe is connected with the room of an upper laboratory, the second air pipe is connected with the laboratory, and the third air pipe is connected with the atmosphere, a multi-way pipe is provided on the second air pipe, the first air pipe and a branch pipe on the second air pipe are connected with the relative pressure difference sensor, and the other branch pipe on the second air pipe and the third air pipe are connected with the absolute pressure difference sensor.

2. The laboratory multi-room pressure gradient controller of claim 1, wherein: It also includes an access control signal sensor, which is connected with the pressure gradient controller.

3. The laboratory multi-room pressure gradient controller of claim 1, wherein: The ventilation device includes a fan and an exhaust device.

4. The laboratory multi-room pressure gradient controller of claim 1, wherein: The control screen and the pressure gradient controller communicate through an RS485 bus.

Images