CN112197899A - Digital monitoring device for positive and negative pressure difference in room - Google Patents
Digital monitoring device for positive and negative pressure difference in room Download PDFInfo
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- CN112197899A CN112197899A CN202011220049.XA CN202011220049A CN112197899A CN 112197899 A CN112197899 A CN 112197899A CN 202011220049 A CN202011220049 A CN 202011220049A CN 112197899 A CN112197899 A CN 112197899A
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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Abstract
The application discloses digital room positive and negative pressure difference monitoring devices includes: the device comprises a first pressure sensing module, a second pressure sensing module, a difference module, an error counteracting module and an indicating module; the first pressure sensing module, the second pressure sensing module, the error counteracting module and the indicating module are connected with the difference module; the first pressure sensing module acquires the air pressure in a room to be monitored; the second pressure sensing module acquires the air pressure outside the room to be monitored; when the error counteracting module is triggered, the pressure difference is stored as an error counteracting value; the difference module calculates the pressure difference and subtracts the error offset value to obtain a pressure difference value; the indication module indicates a direction and/or a value of the pressure difference. The technical scheme of this application provides an easy-to-use device, lets people can relax, observe the positive negative pressure differential situation of the inside and outside air in room directly perceivedly: whether it is positive or negative, and a definite value of the positive-negative pressure difference, and is convenient to install, operate and move.
Description
Technical Field
The application relates to the field of positive and negative pressure difference monitoring devices, in particular to a device for monitoring positive and negative pressure difference inside and outside a room.
Background
The indoor air pressure is higher than the external air pressure and is called positive pressure; when the air pressure in the room is lower than the external air pressure, the air pressure is called negative pressure. The indoor of a room keeps a certain positive pressure relative to the outdoor, so that dust, haze, viruses, germs, harmful gases and the like can be prevented from entering the room, and the room is beneficial to the healthy life of people; some special facilities, such as infection wards, need to maintain a certain negative pressure indoors relative to outdoors in order to prevent viruses from diffusing through the air; after the new crown epidemic situation occurs, the positive and negative pressure difference condition of the room causes more concern of people. Although some technical means, such as a fresh air system, can keep positive pressure or negative pressure in a room, an easy-to-use device is not available at present, so that people can easily and intuitively know the positive and negative pressure difference condition of air inside and outside the room. In the prior art, the pressure gauge cannot measure indoor or outdoor pressure values simultaneously, and if the pressure values inside and outside a room are measured respectively and then calculated, the operation is inconvenient, and the indoor pressure or negative pressure and a clear positive-negative pressure difference value cannot be indicated at any time; the two pressure-insulated barometers are used for measuring the air pressure values inside and outside the room respectively and then are calculated, the error between the two barometers can even exceed a tiny pressure difference value, the accuracy of the measurement result is seriously influenced, and the method is not feasible; although the differential pressure type barometer can indicate the direction and the value of positive pressure and negative pressure, the ventilation pipeline is communicated to the outside, so that a hole needs to be drilled through a wall, and the installation and the movement are inconvenient.
Disclosure of Invention
The invention provides a digital living room positive-negative pressure difference monitoring device which can conveniently monitor and indicate the indoor air pressure difference relative to the outdoor air pressure difference and solves the technical problem.
In a first aspect, the application discloses a digital living room positive-negative pressure difference monitoring device, includes: the device comprises a first pressure sensing module, a second pressure sensing module, a difference module, an error counteracting module and an indicating module; the first pressure sensing module, the second pressure sensing module, the error counteracting module and the indicating module are connected with the difference module; the first pressure sensing module acquires first pressure data, wherein the first pressure data is obtained by sensing the air pressure in a room to be monitored; the second pressure sensing module acquires second pressure data, and the second pressure data is obtained by sensing the air pressure outside the room to be monitored; when the error counteracting module is triggered, an error counteracting value is stored, and the error counteracting value is a difference value obtained by subtracting the second pressure data from the first pressure data; the difference module calculates the difference value of the first pressure data minus the second pressure data and then minus the error offset value; the indication module indicates a direction and/or a value of the pressure difference.
Further, the first pressure data and the second pressure data are obtained by sensing the same type of absolute pressure type pressure sensor.
Further, still include: a receiving module; the receiving module is connected with the first pressure sensing module and receives first pressure data; and/or the receiving module is connected with the second pressure sensing module, and the receiving module receives the second pressure data.
Further, still include: a first pressure sensor; the first pressure sensor is an absolute pressure type pressure sensor, a vent hole of the first pressure sensor is communicated with the interior of a room to be monitored, and the first pressure sensor is connected with the first pressure sensing module; the first pressure sensor senses the air pressure inside the room to be monitored.
Further, still include: a second pressure sensor; the second pressure sensor is an absolute pressure type pressure sensor, a vent hole of the second pressure sensor is communicated with the outside of the room to be monitored, and the second pressure sensor is connected with the second pressure sensing module; the second pressure sensor senses the air pressure outside the room to be monitored.
Further, still include: a control module; the control module is connected with the difference module; the control module sends out a control signal, and the control signal at least comprises one of the following signals: opening, closing, reducing, increasing, accelerating and decelerating, wherein the control signal is used for controlling equipment capable of changing the pressure difference between the inside and the outside of the room to be monitored, so that the pressure difference is maintained within a preset range.
Further, the difference module calculates the sum of the N first pressure data, the sum of the N second pressure data and the sum of the N error offset values in the same time period, and divides the obtained difference value by N to obtain a pressure difference value, wherein N is an integer greater than 1.
Further, the indication module indicates at least one of the following information: too high differential pressure, too low differential pressure, percentage displacement of differential pressure.
In a second aspect, the application also discloses a device with a built-in digital room positive and negative pressure difference monitoring device, which is provided with the digital room positive and negative pressure difference monitoring device.
In a third aspect, the present application further discloses a device for monitoring the positive-negative pressure difference of a living room in cooperation with a digital living room positive-negative pressure difference monitoring device, comprising: a pressure sensor and a transmitting module; the pressure sensor is connected with the sending module; the pressure sensor is an absolute pressure type pressure sensor; the pressure sensor is used for monitoring the air pressure inside or outside a room to obtain pressure data; the sending module sends the pressure data.
The technical scheme provided by the application has the following beneficial effects: the utility model provides an easy-to-use device, let people can easily, directly perceivedly observe the positive negative pressure difference situation of room inside and outside air: whether it is positive or negative, and a definite value of the positive-negative pressure difference, and is convenient to install, operate and move.
Drawings
Fig. 1 shows a structure of a digital living room positive-negative pressure difference monitoring device and a system structure for monitoring the positive-negative pressure difference of a living room.
Detailed Description
In the present application, the specific embodiments and features of the embodiments may be combined with each other without conflict. The described embodiments are only some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the numbers so used are interchangeable under appropriate circumstances in order to describe embodiments of the application. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, or system that comprises a list of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not expressly listed or inherent to such process, apparatus, or system.
In order to make those skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application.
Fig. 1 shows an embodiment of a digital living room positive/negative pressure difference monitoring device and a system configuration for monitoring a living room positive/negative pressure difference.
The wall of the room 9 to be monitored divides the space into a room interior 8 and a room exterior 10.
The digital living room positive and negative pressure difference monitoring device 7 is arranged in a living room 8. The digital living room positive-negative pressure difference monitoring device 7 comprises a difference module 1, a first pressure sensing module 2, a first pressure sensor 22, a second pressure sensing module 3, a receiving module 31, an indicating module 4, an error counteracting module 5 and a control module 11. The difference module 1 is connected with the first pressure sensing module 2, the second pressure sensing module 3, the indication module 4, the error cancellation module 5 and the control module 11, the first pressure sensing module 2 is connected with the first pressure sensor 22, and the second pressure sensing module 3 is connected with the receiving module 31.
The first pressure sensor 22 is a high-precision pressure-insulated pressure sensor, and the model is BMP 380; the air vent 23 of the first pressure sensor 22 is communicated with the room interior 8 and senses the air pressure data of the room interior 8; the first pressure sensing module 2 collects air pressure data of the interior 8 of the living room from the first pressure sensor 22 every 1 second to obtain first pressure data.
The receiving module 31 is a wireless data receiving module, and receives air pressure data of the outside 10 of the living room; the second pressure sensing module 3 acquires the air pressure data of the outside of the living room 10 from the receiving module 31 every 1 second, and obtains the second pressure data.
The difference module 1 calculates the difference value of the first pressure data minus the second pressure data, and then subtracts the error offset value to obtain the pressure difference value. The indicating module 4 is provided with an LCD display screen, and the positive and negative pressure directions and the positive and negative pressure values are displayed on the LCD display screen according to the pressure difference value.
The error counteracting module 5 is provided with an error counteracting button, when the error counteracting button is pressed, the error counteracting module 5 is triggered, and the difference value of the first pressure data minus the second pressure data is stored as an error counteracting value.
The control module 11 is provided with a control interface comprising the following control signal lines: opening, closing, reducing, increasing, accelerating and decelerating, wherein the control signal line is used for controlling equipment capable of changing the pressure difference between the interior 8 of the room and the exterior 10 of the room, such as an air inlet valve, an air exhaust valve, an air return valve, a variable frequency fan and the like of a fresh air system, so that the pressure difference is maintained within a preset range.
The wireless air pressure acquisition device 6 is arranged outside the living room 10. The wireless air pressure acquisition device 6 comprises a pressure sensor 62 and a sending module 61. The pressure sensor 62 is connected to the sending module 61. The pressure sensor 62 is a BMP380 high-precision pressure-insulating type pressure sensor with the same model as the first pressure sensor 22, and the vent 63 is communicated with the atmosphere outside the living room 10 to sense the air pressure data outside the living room 10; the transmission module 61 is a wireless data transmission module that transmits air pressure data of the outside 10 of the living room.
Before the monitoring of the positive and negative pressure difference of the room is started, the error counteracting button is pressed on the premise of closing the indoor fresh air system and opening the door and the window, so that the digital room positive and negative pressure difference monitoring device 7 stores an error counteracting value, and the pressure difference generated by the influence of the absolute accuracy and the long-term stability of the sensor, the difference of the heights of indoor and outdoor air pressure induction points and the like can be removed in the calculation process of the difference module 1.
In order to avoid interference and obtain a more smooth and stable and accurate indication number, the difference module 1 may further calculate the sum of 60 first pressure data, subtract the sum of 60 second pressure data, subtract the sum of 60 error cancellation values in one minute, and divide the difference by 60 to obtain a pressure difference value.
In order to facilitate the user to read the information, the indication module 4 may also display the following information on the LCD display screen, based on the pressure difference compared to a threshold or stored historical data: too high differential pressure, too low differential pressure, percentage displacement of differential pressure.
In the technical scheme of this application embodiment, adopted two key technology details to reduce the error and improve the precision for it has the feasibility to calculate indoor outer little air pressure difference value by two absolute pressure type pressure sensor response data accuracy, and one of them is the error and offsets the module, and another is the pressure sensor who uses the same model, and the detailed description is as follows:
the range of the high-precision pressure-insulating type pressure sensor BMP380 adopted by the digital living room positive-negative pressure difference monitoring device 7 and the wireless air pressure acquisition device 6 is 300 to 1250hPa, the absolute precision in the range of 300 to 1100hPa is +/-0.5hPa, the relative precision in the range of 200hPa of 900 to 1100hPa is +/-0.06hPa, the highest resolution reaches 0.03Pa, and the long-term stability of 12 months is +/-0.33 hPa. In the technical scheme of the embodiment of the application, the pressure difference between the inside and the outside of a living room is only within +/-50Pa, and obviously, the absolute precision of BMP380 cannot be enough to distinguish the tiny pressure difference. The main factor influencing the absolute accuracy of the BMP380 is offset generated in the manufacturing process, and the offset is offset skillfully through designing an error offset module in the embodiment of the application, so that the factor influencing the absolute accuracy is removed. After removing factors that affect absolute accuracy, accuracy is mainly determined by relative accuracy; the measurement condition of the relative accuracy of the BMP380 is in a range of 200hPa of 900-1100 hPa, while the variation range of the atmospheric pressure to be measured in the embodiment is generally within 40hPa, and is far lower than the range of 200hPa, the accuracy is higher when the range is smaller, and the relative accuracy of the BMP380 can reach 1.2Pa within +/-20hPa according to linear calculation. Because two pressure sensors BMP380 with the same model are adopted, the pressure sensors BMP380 are consistent in the direction of errors caused by some factors, and the error obtained by calculating the difference value cannot be enlarged but is reduced. The influence of the long-term stability on the measurement precision can be offset by the error offset module through the same offset direction of the same model; furthermore, the offset module can be triggered periodically in the use process, and the gradual accumulation of factors which cannot be offset completely by the error offset module and influence the long-term stability over time is avoided.
For the indoor and outdoor pressure difference monitoring of a plurality of rooms, a digital room positive and negative pressure difference monitoring device 7 can be arranged in each room 8, and a wireless air pressure acquisition device 6 arranged outside the room 10 is shared.
The technical scheme of this application embodiment, as long as place digital room positive and negative pressure difference monitoring devices 7 indoor, place wireless atmospheric pressure collection system 6 outdoor to press the error before the use and offset the button, the indoor user of body department just can easily, directly perceivedly observe the positive and negative pressure difference situation of the inside and outside air in room through the LCD display screen: the pressure is positive or negative, and the positive and negative pressure difference is definite, so that the installation is not needed, and the operation and the movement are very convenient.
Claims (10)
1. A digital living room positive-negative pressure difference monitoring device is characterized by comprising: the device comprises a first pressure sensing module, a second pressure sensing module, a difference module, an error counteracting module and an indicating module;
the first pressure sensing module, the second pressure sensing module, the error counteracting module and the indicating module are connected with the difference module;
the first pressure sensing module acquires first pressure data, wherein the first pressure data is obtained by sensing the air pressure in a room to be monitored;
the second pressure sensing module acquires second pressure data, and the second pressure data is obtained by sensing the air pressure outside the room to be monitored;
when the error counteracting module is triggered, an error counteracting value is stored, and the error counteracting value is a difference value obtained by subtracting the second pressure data from the first pressure data;
the difference module calculates the difference value of the first pressure data minus the second pressure data and then minus the error offset value;
the indication module indicates a direction and/or a value of the pressure difference value.
2. The device of claim 1, wherein the first pressure data and the second pressure data are sensed by the same model of absolute pressure sensor.
3. The apparatus of claim 1, further comprising: a receiving module;
the receiving module is connected with the first pressure sensing module and receives the first pressure data;
and/or the receiving module is connected with the second pressure sensing module, and the receiving module receives the second pressure data.
4. The apparatus of claim 1, further comprising: a first pressure sensor;
the first pressure sensor is an absolute pressure type pressure sensor, a vent hole of the first pressure sensor is communicated with the interior of the room to be monitored, and the first pressure sensor is connected with the first pressure sensing module;
the first pressure sensor senses the air pressure in the room to be monitored.
5. The apparatus of claim 1, further comprising: a second pressure sensor;
the second pressure sensor is an absolute pressure type pressure sensor, a vent hole of the second pressure sensor is communicated with the outside of the room to be monitored, and the second pressure sensor is connected with the second pressure sensing module;
the second pressure sensor senses the air pressure outside the room to be monitored.
6. The apparatus of claim 1, further comprising: a control module;
the control module is connected with the difference module;
the control module outputs a control signal, wherein the control signal at least comprises one of the following: the control signal is used for controlling equipment capable of changing the pressure difference between the inside and the outside of the room to be monitored, so that the pressure difference is maintained within a preset range.
7. The apparatus of claim 1, wherein the difference module calculates a sum of N first pressure data, N second pressure data, and N error cancellation values over a same time period, and divides the difference by N, where N is an integer greater than 1.
8. The apparatus of claim 1, wherein the indicating module further indicates at least one of: too high differential pressure, too low differential pressure, percentage displacement of differential pressure.
9. An apparatus with a built-in digital living room positive-negative pressure difference monitoring device, which is characterized by comprising the device of any one of claims 1 to 8.
10. A device for monitoring the positive-negative pressure difference in a living room in cooperation with the device of claim 3, comprising: a pressure sensor and a transmitting module;
the pressure sensor is connected with the sending module;
the pressure sensor is an absolute pressure type pressure sensor;
the pressure sensor senses the air pressure inside or outside the room to be monitored to obtain pressure data;
the sending module sends the pressure data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011220049.XA CN112197899A (en) | 2020-11-05 | 2020-11-05 | Digital monitoring device for positive and negative pressure difference in room |
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| CN202011220049.XA CN112197899A (en) | 2020-11-05 | 2020-11-05 | Digital monitoring device for positive and negative pressure difference in room |
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| CN112197899A true CN112197899A (en) | 2021-01-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0188909A2 (en) * | 1984-12-21 | 1986-07-30 | The Garrett Corporation | Device and method for compensating for sensor error in system calculating dynamic pressure |
| US5402666A (en) * | 1994-07-26 | 1995-04-04 | Scanivalve Corporation | Method and apparatus for precise measurement of differential pressures |
| JP2001153441A (en) * | 1999-11-29 | 2001-06-08 | Matsushita Refrig Co Ltd | Air-conditioning system for shop |
| US20160033158A1 (en) * | 2013-04-01 | 2016-02-04 | Carrier Corporation | Air conditioning system and method for controlling air conditioning system |
| JP2020176963A (en) * | 2019-04-22 | 2020-10-29 | 株式会社村田製作所 | Pressure measuring device and differential pressure controlling system |
-
2020
- 2020-11-05 CN CN202011220049.XA patent/CN112197899A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0188909A2 (en) * | 1984-12-21 | 1986-07-30 | The Garrett Corporation | Device and method for compensating for sensor error in system calculating dynamic pressure |
| US5402666A (en) * | 1994-07-26 | 1995-04-04 | Scanivalve Corporation | Method and apparatus for precise measurement of differential pressures |
| JP2001153441A (en) * | 1999-11-29 | 2001-06-08 | Matsushita Refrig Co Ltd | Air-conditioning system for shop |
| US20160033158A1 (en) * | 2013-04-01 | 2016-02-04 | Carrier Corporation | Air conditioning system and method for controlling air conditioning system |
| JP2020176963A (en) * | 2019-04-22 | 2020-10-29 | 株式会社村田製作所 | Pressure measuring device and differential pressure controlling system |
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Application publication date: 20210108 |
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