CN220063260U - Multiunit low pressure alarm device - Google Patents
Multiunit low pressure alarm device Download PDFInfo
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- CN220063260U CN220063260U CN202321437464.XU CN202321437464U CN220063260U CN 220063260 U CN220063260 U CN 220063260U CN 202321437464 U CN202321437464 U CN 202321437464U CN 220063260 U CN220063260 U CN 220063260U
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- air source
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- 238000012544 monitoring process Methods 0.000 claims abstract description 38
- 230000000712 assembly Effects 0.000 claims abstract description 34
- 238000000429 assembly Methods 0.000 claims abstract description 34
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 238000012806 monitoring device Methods 0.000 claims abstract description 21
- 239000003570 air Substances 0.000 description 54
- 239000007789 gas Substances 0.000 description 19
- 239000002360 explosive Substances 0.000 description 5
- 239000011261 inert gas Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- -1 petrochemical Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- Measuring Fluid Pressure (AREA)
Abstract
The utility model discloses a multi-group low-pressure alarm device, which belongs to the technical field of pneumatic control and comprises a monitoring device shell; the compressed air source inlet is provided with a plurality of compressed air source inlets and is arranged on the side surface of the monitoring device shell; the pressure monitoring port is also arranged on the side surface of the monitoring device shell; the sensor assemblies are arranged in parallel in the monitoring device shell, the lower ends of the sensor assemblies are communicated with the compressed air source inlet below the sensor assemblies, the upper ends of the sensor assemblies are communicated with the pressure monitoring port, and the compressed air source inlet and the air source at the pressure monitoring port flow into the sensor assemblies; the pressure alarm mechanism is provided with a plurality of pressure alarm mechanisms which are communicated with the upper end of the sensor assembly. Through be equipped with a plurality of sensor assemblies and pressure alarm mechanism in monitoring devices casing for low pressure alarm device can be applicable to redundant signal's place, satisfies the service condition, can in time monitor the early warning.
Description
Technical Field
The utility model relates to the technical field of pneumatic control, in particular to a plurality of groups of low-pressure alarm devices.
Background
Positive pressure type electric devices are charged devices used in explosive places, and in some industrial places such as petroleum, petrochemical, natural gas, chemical, etc., dangerous explosive gases are released during processing and production, and if electric devices are used in places containing explosive gases, electric devices having an explosion-proof function must be used. The explosion-proof principle of positive pressure type electrical equipment is that fresh air or inert gas with certain pressure is introduced into the shell of the equipment, dangerous gas in the inner cavity is replaced, and after the replacement is finished, the fresh air or inert gas with certain pressure is continuously introduced, so that the surrounding combustible gas cannot enter the shell, and the ignition source is prevented from contacting with the explosive gas, so that the purpose of explosion prevention is achieved. The key measure of a positive electrical installation is that the pressure of the protective gas (fresh air or inert gas) inside the installation housing is at least 50Pa above the pressure of the environment.
The existing low-voltage alarm device only has 1 group of alarm signals, and can not meet the use conditions in places where redundant signals are needed.
Therefore, how to provide a novel alarm device, so that multiple sets of alarm signals can be provided, is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
Therefore, the utility model provides a plurality of groups of low-voltage alarm devices, which solves the problem that the use requirement cannot be met in redundant signal places due to single alarm signal devices in the prior art.
In order to achieve the above object, the present utility model provides the following technical solutions:
a multiple-unit low-voltage alarm device comprising:
a monitoring device housing;
the compressed air source inlet is provided with a plurality of compressed air source inlets and is arranged on the side surface of the monitoring device shell;
the pressure monitoring port is also formed on the side surface of the monitoring device shell;
the sensor assemblies are arranged in the monitoring device shell in parallel, the lower ends of the sensor assemblies are communicated with the compressed air source inlet below the sensor assemblies, the upper ends of the sensor assemblies are communicated with the pressure monitoring port, and the compressed air source inlet and the air source at the pressure monitoring port flow into the sensor assemblies;
and the pressure alarm mechanism is provided with a plurality of pressure alarm mechanisms, and the pressure alarm mechanisms are communicated with the upper ends of the sensor assemblies.
Further, the sensor assembly is communicated with the pressure monitoring port through a main pipeline and a branch pipeline, a plurality of branch pipelines are arranged, the plurality of branch pipelines are respectively communicated with the upper end of the sensor assembly, the main pipeline is transversely arranged below the sensor assembly, the main pipeline is communicated with the pressure monitoring port, and the plurality of branch pipelines are communicated with the main pipeline through pipe joints.
Further, the sensor assembly includes at least an operating condition, and in the operating condition, the source pressure at the compressed source inlet is greater than the source pressure at the pressure monitoring port, and the difference is greater than the low pressure set point within the sensor assembly.
Further, the pressure alarm mechanism comprises a three-wire switch and a cylinder, the three-wire switch is in electric signal connection with the cylinder, the cylinder is communicated with the sensor assembly through a pipe joint, and an air source in the sensor assembly flows into the cylinder under the working state of the sensor assembly.
Further, the three-wire switch is deactivated when the air source within the sensor assembly is not flowing within the cylinder; when the air source in the sensor assembly flows into the cylinder, the three-wire switch is switched on and off, and a switch-on signal is output.
Further, the pressure alarm mechanism further comprises an indicator lamp, and the sensor assembly is in a working state, and the indicator lamp receives an output signal of the three-wire switch.
The utility model has the following advantages:
the utility model is provided with a plurality of compressed air source inlet openings on the monitoring device shell, and a pressure monitoring opening on the monitoring device shell. Compressed gas is injected into the positive pressure device through the compressed gas source inlet port, and atmospheric pressure in the external environment is input through the pressure monitoring port. And the compressed air source inlet is respectively communicated with various redundant structures in the electrical equipment.
The sensor assemblies are arranged in the monitoring device shell in parallel, the lower ends of the sensor assemblies are communicated with the compressed air source inlet below the sensor assemblies, and the upper ends of the sensor assemblies are communicated with the compressed air source inlet. A gas source at the pressure monitoring port flows into the sensor assembly and a compressed gas source inlet port flows compressed gas into the sensor assembly. When the air source pressure of the compressed air source inlet is larger than the air source pressure at the pressure monitoring port and the difference value is larger than the low-pressure set value in the sensor assembly, the sensor assembly is started to work. The upper end of each group of sensor components is communicated with a pressure alarm mechanism.
The pressure alarm mechanism comprises a three-wire switch which is connected with the electric signal of the cylinder. When the sensor assembly is in a working state, an air source in the sensor assembly flows into the air cylinder, the air cylinder drives the three-wire switch to switch on and off, a switch closing signal is output, and otherwise, the three-wire switch does not work. Through air source and cylinder in the sensor assembly, under the condition that pressure alarm mechanism does not carry out outside circular telegram, make three-wire switch close to realize the monitoring early warning of pressure, reduce working cost.
According to the utility model, the plurality of sensor assemblies and the pressure alarm mechanism are arranged in the monitoring device shell, so that the low-pressure alarm device can be suitable for places with redundant signals, meets the use conditions, and can monitor and early warn in time.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present utility model, should fall within the ambit of the technical disclosure.
FIG. 1 is a schematic view of the internal structure of the present utility model;
FIG. 2 is a schematic view of the external structure of the present utility model;
in the figure:
1 monitoring a device housing; 2, a compressed air source inlet; 3, a pressure monitoring port; a sensor assembly; 5, a pressure alarm mechanism; 501 a three-wire switch; 502 cylinder; 503 indicator lights; 6, a main pipeline; 7 branch pipes.
Detailed Description
Other advantages and advantages of the present utility model will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order to solve the problem that the use requirement cannot be met in redundant signal places due to the fact that an alarm signal device is single in the prior art, a plurality of groups of low-pressure alarm devices are provided, and as shown in fig. 1 and 2, the low-pressure alarm device comprises a monitoring device shell 1, a compressed air source inlet 2, a pressure monitoring port 3, a sensor assembly 4 and a pressure alarm mechanism 5, wherein a plurality of compressed air source inlet 2 are formed in the side face of the monitoring device shell 1, and a pressure monitoring port 3 is formed in the side face of the monitoring device shell 1. The compressed air source inlet 2 is filled with 4-8bar of fresh air or inert gas, and is replaced by dangerous gas in the inner cavity, and ventilation is continued. The pressure monitoring port 3 communicates with the external environment. Compressed gas is injected into the positive pressure apparatus through the compressed gas source inlet port 2, and atmospheric pressure in the external environment is input through the pressure monitoring port 3. And the compressed air source inlet 2 is respectively communicated with various redundant structures in the electrical equipment.
The plurality of sensor assemblies 4 are arranged in the monitoring device shell 1 in parallel, the lower ends of the sensor assemblies are communicated with the compressed air source inlet 2 below the sensor assemblies through pipelines and pipe joints, the upper ends of the sensor assemblies are communicated with the pressure monitoring port 3, and the compressed air source inlet 2 and the air source at the pressure monitoring port 3 flow into the sensor assemblies 4. The upper end of each group of sensor assemblies 4 is communicated with a pressure alarm mechanism 5. The sensor assembly 4 monitors the pressure difference of the air pressure inside and outside the housing and transmits a signal according to the comparison result. The pressure warning mechanism 5 receives the output signal of the sensor assembly 4.
The sensor assembly 4 is provided with a low pressure set point, which is set to at least 50Pa. The sensor assembly 4 is internally provided with a jackscrew which controls the low pressure set point in the sensor assembly 4. Only if the pressure of the protective gas fresh air or inert gas in the equipment shell is at least 50Pa higher than the pressure of the environment, the surrounding combustible gas cannot enter the shell, so that the ignition source is prevented from contacting with the explosive gas, and the purpose of explosion prevention is achieved.
The sensor assembly 4 is a differential pressure sensor in the prior art, and is used for measuring the pressure difference between the inside and the outside of the electrical equipment through the differential pressure sensor and controlling whether the sensor assembly 4 is communicated with the air pump 502 through the bending change of the diaphragm in the sensor assembly. A jackscrew is provided between the sensor assembly 4 and the air pump 502, by which the sensor assembly 4 communicates with the air pump 502 to determine the degree of bending of the diaphragm.
The sensor assembly 4 is communicated with the pressure monitoring port 3 through the main pipeline 6 and the branch pipelines 7, the branch pipelines 7 are provided with a plurality of branch pipelines 7, the plurality of branch pipelines 7 are respectively communicated with the upper ends of the sensor assembly 4, the main pipeline 6 is transversely arranged below the plurality of sensor assemblies 4, the main pipeline 6 is communicated with the pressure monitoring port 3, and the plurality of branch pipelines 7 are communicated with the main pipeline 6 through pipe joints.
If electrical equipment with redundant signals is needed for pressure monitoring, pressure monitoring alarms are needed for various redundant structures therein. And the compressed air source inlet 2 is respectively communicated with various redundant structures in the electrical equipment. Ambient air enters each branch conduit through the main conduit 6 of the pressure monitoring port 3 and thus enters the sensor assembly 4 separately. Each group of sensor assemblies 4 respectively monitors the internal and external air pressure differences in the communicated equipment, and the air pressure safety condition of the equipment is monitored through the air pressure differences.
The utility model is provided with a plurality of sensor assemblies 4, so that the low-voltage alarm device can be suitable for places with redundant signals, meets the use conditions and can monitor and early warn in time.
The pressure alarm mechanism 5 comprises a three-wire switch 501 and a cylinder 502, wherein the three-wire switch 501 is in electric signal connection with the cylinder 502, the cylinder 502 is communicated with the sensor assembly 4 through a pipe joint, and the cylinder 502 can drive the three-wire switch 501 to be switched on and off.
When the air source pressure at the compressed air source inlet 2 is larger than the air source pressure at the pressure monitoring port 3 and the difference is larger than the low pressure set value in the sensor assembly 4, the sensor assembly 4 is in an operating state. In the operating state of the sensor assembly 4, the air supply therein flows into the cylinder 502. Conversely, if the difference is less than the low pressure set point in the sensor assembly 4 or the source pressure at the compressed source inlet 2 is less than the source pressure at the pressure monitoring port 3, the sensor assembly 4 is not operating and the source of gas therein does not flow into the cylinder 502.
When the air source in the sensor assembly 4 does not flow into the cylinder 502, the three-wire switch 501 does not operate; when the air source flows into the sensor assembly 4 in the cylinder 502, the three-wire switch 501 is switched on and off, and a switch-on signal is output. Through the air source and the cylinder 502 in the sensor assembly 4, the three-wire switch 501 is closed under the condition that the pressure alarm mechanism 5 is not electrified externally, so that the monitoring and early warning of pressure are realized, and the working cost is reduced.
The pressure alarm mechanism 5 further comprises an indicator light 503, and the sensor assembly 4 is in an operating state, the indicator light 503 receives an output signal of the three-wire switch 501. When the sensor assembly 4 is in an operating state, the indicator light 503 receives an output signal of the sensor assembly 4, and the color of the indicator light 503 changes to green to indicate that the equipment is good; when the sensor assembly 4 is in a non-working state, the indicator light 503 does not receive the output signal of the sensor assembly 4, the color of the indicator light 503 changes to red, an alarm is given, and a worker is reminded to continuously inflate the equipment through the compressed air source inlet 2.
The application process of the embodiment of the utility model is as follows:
the compressed air source inlet 2 is respectively communicated with various redundant structures in the electrical equipment, and air sources at the compressed air source inlet 2 and the pressure monitoring port 3 flow into the sensor assembly 4. When the air source pressure of the compressed air source inlet 2 is larger than the air source pressure at the pressure monitoring port 3 and the difference value is larger than the low pressure set value in the sensor assembly 4, the sensor assembly 4 is opened to work. When the sensor assembly 4 is in operation, a gas source therein flows into the cylinder 502. The cylinder 502 drives the three-wire switch 501 to switch on and off, and outputs a switch-on signal, and the color of the indicator light 503 turns green. Otherwise, the three-wire switch 501 is not operated, and the indicator light 503 turns red to give an alarm.
While the utility model has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.
Claims (6)
1. A multiple-unit low-voltage alarm device, comprising:
a monitoring device housing (1);
a plurality of compressed air source inlet ports (2) are arranged and are arranged on the side surface of the monitoring device shell (1);
a pressure monitoring port (3) which is also arranged on the side surface of the monitoring device shell (1);
the sensor assemblies (4) are arranged in parallel in the monitoring device shell (1), the lower ends of the sensor assemblies (4) are communicated with the compressed air source inlet (2) below the sensor assemblies, the upper ends of the sensor assemblies are communicated with the pressure monitoring port (3), and the compressed air source inlet (2) and an air source at the pressure monitoring port (3) flow into the sensor assemblies (4);
and the pressure alarm mechanisms (5) are provided with a plurality of pressure alarm mechanisms which are communicated with the upper ends of the sensor assemblies (4).
2. The multi-group low-pressure alarm device according to claim 1, wherein the sensor assembly (4) is communicated with the pressure monitoring port (3) through a main pipeline (6) and a branch pipeline (7), the branch pipeline (7) is provided with a plurality of branch pipelines, the branch pipelines (7) are respectively communicated with the upper ends of the sensor assemblies (4), the main pipeline (6) is transversely arranged below the plurality of sensor assemblies (4), the main pipeline (6) is communicated with the pressure monitoring port (3), and the branch pipelines (7) are communicated with the main pipeline (6) through pipe joints.
3. A multi-group low pressure warning device according to claim 1, characterized in that the sensor assembly (4) comprises at least an operating state, and in which the gas source pressure at the compressed gas source inlet (2) is greater than the gas source pressure at the pressure monitoring port (3) by a difference greater than the low pressure set point in the sensor assembly (4).
4. A multi-group low pressure alarm device according to claim 3, characterized in that the pressure alarm mechanism (5) comprises a three-wire switch (501) and a cylinder (502), the three-wire switch (501) is electrically connected with the cylinder (502), the cylinder (502) is communicated with the sensor assembly (4) through a pipe joint, and the air source in the sensor assembly (4) flows into the cylinder (502) in the working state.
5. The multiple-group low-pressure alarm device according to claim 4, characterized in that said three-wire switch (501) is deactivated when the air source inside said cylinder (502) does not flow inside said sensor assembly (4); when the air source in the sensor assembly (4) flows into the air cylinder (502), the three-wire switch (501) is switched on and off, and a switch-on signal is output.
6. The multiple-group low-voltage alarm device according to claim 4, wherein the pressure alarm mechanism (5) further comprises an indicator light (503), and wherein the sensor assembly (4) is in an operating state, the indicator light (503) receives an output signal of the three-wire switch (501).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321437464.XU CN220063260U (en) | 2023-06-07 | 2023-06-07 | Multiunit low pressure alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321437464.XU CN220063260U (en) | 2023-06-07 | 2023-06-07 | Multiunit low pressure alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220063260U true CN220063260U (en) | 2023-11-21 |
Family
ID=88752498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321437464.XU Active CN220063260U (en) | 2023-06-07 | 2023-06-07 | Multiunit low pressure alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220063260U (en) |
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2023
- 2023-06-07 CN CN202321437464.XU patent/CN220063260U/en active Active
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