CN116498799B - Household intelligent full-effect safety device - Google Patents
Household intelligent full-effect safety device Download PDFInfo
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- CN116498799B CN116498799B CN202310744824.9A CN202310744824A CN116498799B CN 116498799 B CN116498799 B CN 116498799B CN 202310744824 A CN202310744824 A CN 202310744824A CN 116498799 B CN116498799 B CN 116498799B
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- overpressure
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- 230000006837 decompression Effects 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims description 65
- 239000012530 fluid Substances 0.000 claims description 52
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- 230000009471 action Effects 0.000 claims description 6
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- 230000003287 optical effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 60
- 239000003345 natural gas Substances 0.000 abstract description 30
- 239000007789 gas Substances 0.000 abstract description 15
- 230000003111 delayed effect Effects 0.000 abstract 1
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- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0058—Optical means, e.g. light transmission, observation ports
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Emergency Alarm Devices (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The application provides a household intelligent full-effect safety device, and belongs to the technical field of gas valves. The gas electromagnetic valve is interlocked with the combustible gas leakage alarm in the prior art, the problem of safety protection opportunity is delayed, the pressure sensing assembly with the diaphragm is adopted, the piston rod is driven to slide through deformation of the diaphragm, an overpressure feedback point and a decompression feedback point are arranged on the piston rod, the piston rod is limited in stroke, and the safety protection of indoor natural gas equipment can be realized quickly, efficiently and at low cost.
Description
Technical Field
The application belongs to the technical field of gas valves, and particularly relates to a household intelligent full-effect safety device.
Background
The domestic natural gas is used in most urban and rural residents in the whole country, and has natural gas application. In addition to the fact that natural gas is inflammable and explosive, safety requirements of pressure levels exist, for example, civil natural gas in residential houses is usually about 2.5kPa, the natural gas pressure of an upstream pipeline is usually 100-400 kPa, and in the use process of natural gas, once upstream equipment fails, overpressure or pressure loss at a low pressure end of the residents easily occurs. When the low pressure end is overpressured, the excessive air pressure is easy to impact and even damage indoor instruments, burners, hoses, joints and the like, so that the natural gas is quickly leaked; when the low pressure end loses pressure, the low pressure pipeline can be in a low pressure state for a long time, once the upstream pressure is recovered, the pipeline in the low pressure state can be impacted by higher air pressure, and indoor hoses and joints are easy to loosen and even damage, so that natural gas is quickly leaked. Therefore, no matter whether the natural gas at the low-pressure end is subjected to overpressure or pressure loss, great hidden danger can be generated for indoor gas use safety.
For indoor natural gas safety protection, the current common measures are as follows: a combustible gas leakage alarm, a fuel gas electromagnetic valve, a self-closing valve and the like. The gas electromagnetic valve is a safe and reliable cut-off type safety protection device which is quick in response and can be cut off rapidly through the on-off of a power supply so as to play a good safety protection role, but when the gas electromagnetic valve is monitored, external signal output is needed to trigger the cut-off action of the gas electromagnetic valve, and residents lack of the configuration of a natural gas pressure sensing device, so that the gas electromagnetic valve is often only used for being interlocked with a combustible gas leakage alarm, the electromagnetic valve can be triggered to cut off only when the alarm detects the concentration of the combustible gas, the function of the electromagnetic valve as the good cut-off device is limited, the electromagnetic valve can only react after the natural gas leaks, the time of safety protection is prolonged, and hidden danger is maximized.
Thus, there is a need for a reliable, sensitive and low cost safety protection device that can monitor natural gas pressure values and perform safety control.
Disclosure of Invention
Aiming at the problems existing in the prior art, the application provides a household intelligent full-effect safety device, which aims to realize efficient safety protection on indoor natural gas equipment and reduce cost.
In order to achieve the technical purpose, the application adopts the following technical scheme:
the utility model provides a full effect safety device of user intelligence, it includes pipeline main part at least, solenoid valve and pressure sensing subassembly, have the fluid passageway that supplies the fluid to flow in the pipeline main part, solenoid valve and pressure sensing subassembly are all installed on the pipeline main part and all communicate with the fluid passageway of pipeline main part, in the direction of fluid flow, the solenoid valve is located the upstream side of pipeline main part, pressure sensing subassembly is located the downstream side of pipeline main part, solenoid valve and pressure sensing subassembly all are connected to the control unit, and wherein, pressure sensing subassembly includes the piston rod, the superpressure feedback point, the decompression feedback point and detecting element, superpressure feedback point and decompression feedback point all set up on the piston rod, the piston rod can slide under the pressure effect of the fluid in the fluid passageway, when the piston rod slides, superpressure feedback point and decompression feedback point can be detected by detecting element, and when any department in superpressure feedback point and the decompression feedback point is detected by detecting element, the control unit can control the solenoid valve with the fluid passageway of pipeline main part closed.
Compared with the prior art, the application has at least the following beneficial effects:
the intelligent household full-effect safety device adopts a film spring type pressure sensing structure, and does not need a high-precision expensive electronic sensor and a complex circuit to realize control logic; the pressure sensing component and the electromagnetic valve form integrated equipment, so that external equipment or other sensing control devices are not required to be interlocked, the integration level is high, and the requirement on installation conditions is low; the sensitivity and accuracy of the pressure sensing assembly are improved through the arrangement of the overpressure feedback point and the depressurization feedback point, and the processing requirement on data is greatly reduced; the calculability of the pressure-sensitive component under pressure can be used for designing the use sizes of different pressure environments through calculation, so that the application scene is expanded; the arrangement of the piston cavity plays a certain role in protecting the diaphragm, and the service life of the device is prolonged; the arrangement of the detection column is convenient for detection and external observation, and is beneficial to equipment fault diagnosis; the application realizes the efficient and safe protection of indoor natural gas equipment under the condition of reducing the protection cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a schematic diagram of the main structure of a household intelligent full-effect safety device of the application;
FIG. 2 is a schematic view of the structure of the intelligent all-purpose safety device for the user in a normal state;
FIG. 3 is a schematic view of the structure of the intelligent all-effect safety device for a user in an overpressure state;
FIG. 4 is a schematic view of the structure of the intelligent all-effect safety device in the state of no-pressure;
FIG. 5 is a schematic view of a cover used on a pressure sensing assembly in the intelligent all-purpose safety device for a user according to the present application;
FIG. 6 is a schematic view of the structure of a piston rod used on a pressure sensing assembly in the consumer intelligent full-effect safety device of the present application;
FIG. 7 is a schematic view of the cap of FIG. 5 mated with the piston rod of FIG. 6;
FIG. 8 is a schematic side view of the detection column on the cover of FIG. 5;
FIG. 9 is a force analysis schematic diagram of a pressure sensing assembly in the consumer intelligent full-effect safety device of the present application;
FIG. 10 is a schematic diagram of the main structure of a further preferred consumer intelligent full-effect security apparatus in accordance with the present application;
wherein, 1-pipeline main body, 2-cover body, 3-diaphragm, 4-tray, 5-piston rod, 6-top cover, 7-spring, 8-overpressure feedback point, 9-decompression feedback point, 10-detecting unit, 11-electromagnetic valve, 12-cable, 13-opening, 14-spring cavity, 15-pressure sensor,
21-housing, 22-detection column, 211-connection, 212-spring mounting groove, 213-limit plate, 214-piston chamber, 215-connection column, 221-sliding hole, 222-radial hole, 223-gap,
51-bottom plate, 52-screw connection, 53-first slide bar, 54-piston disc, 55-second slide bar.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1 to 9, the present application provides a household intelligent full-effect safety device, which comprises at least a pipe body 1, an electromagnetic valve 11 and a pressure sensing assembly, wherein the pipe body 1 is provided with a fluid channel for fluid flow therein, the electromagnetic valve 11 and the pressure sensing assembly are both installed on the pipe body 1 and are both communicated with the fluid channel of the pipe body 1, the electromagnetic valve 11 is positioned on the upstream side of the pipe body 1 in the direction of fluid flow, the pressure sensing assembly is positioned on the downstream side of the pipe body 1, the electromagnetic valve 11 and the pressure sensing assembly are both connected to a control unit through a cable 12, and wherein the pressure sensing assembly comprises a piston rod 5, an overpressure feedback point 8, a pressure loss feedback point 9 and a detection unit 10, the overpressure feedback point 8 and the pressure loss feedback point 9 are both provided on the piston rod 5, the piston rod 5 is capable of sliding under the pressure of the fluid in the fluid channel, the overpressure feedback point 8 and the pressure loss feedback point 9 are both detected by the detection unit 10 when any one of the overpressure feedback point 8 and the pressure loss point 9 is detected by the detection unit 10, and the control unit is capable of controlling the pipe body 1 to close the fluid channel.
In the prior art, when the electromagnetic valve is required to be cut off due to overpressure or pressure loss in the use process of indoor natural gas, the electromagnetic valve is usually triggered according to external signal output (such as the concentration of combustible gas detected by an alarm, etc.), and the cut-off of the electromagnetic valve has hysteresis and cannot be timely protected; in addition, since the pressure of the natural gas in the house is generally low, if the pressure detection sensor is used for detection, the required accuracy of the pressure detection sensor (including the pressure switch, the pressure transmitter and the like) is very high (the corresponding cost is increased), and the pressure detection sensor cannot be popularized in the residential building due to the high cost and the severe installation condition. According to the application, the piston rod 5 is extended into the fluid channel in the pipeline main body 1, the piston rod 5 can slide under the pressure of fluid in the fluid channel, the pressure of the fluid in the fluid channel is directly converted into the pushing force for the piston rod 5, the overpressure feedback point 8 and the depressurization feedback point 9 are arranged on the piston rod 5, the overpressure and the depressurization are judged according to the moving point position of the piston rod 5, a high-precision expensive electronic sensor is not needed, and a complex circuit is not needed to realize logic control, so that the electromagnetic valve 11 can be accurately and efficiently cut off.
In order to better achieve the object of the present application, in this embodiment, an opening 13 is formed on the pipe body 1 (disposed along the radial direction of the pipe body 1, for example, in the vertical direction in fig. 1), the pressure sensing assembly is mounted at the opening 13, and further includes a cover 2, a diaphragm 3, a tray 4 and a spring 7, wherein the cover 2 includes a housing 21 opened downward (downward recess) and a detection post 22 disposed at the middle portion above the housing 21, the housing 21 is connected to the pipe body 1 through a connection portion 211 (for example, a connection bolt, etc.) at the outer side of the bottom of the housing 21, the diaphragm 3 is disposed across the opening 13, the outer edge of the diaphragm 3 is clamped between the bottom of the housing 21 and the pipe body 1, the middle portion of the diaphragm 3 is fixedly connected to the bottom of the piston rod 5 through the tray 4, the diaphragm 3 can deform along with the change of the fluid pressure in the fluid channel of the pipe body 1 and drive the piston rod 5 to slide away from its initial position, a spring cavity 14 is formed between the diaphragm 3 and the housing 21, the spring cavity 14 is isolated from the opening 13 by the diaphragm 3, the spring 7 is disposed in the spring cavity 14, and the spring 7 is blocked from sliding the initial position of the piston rod 5. As shown in fig. 1 and 5, a spring mounting groove 212 is formed in the top of the housing 21 in the spring cavity 14, the top end of the spring 7 is mounted in the spring mounting groove 212, the tray 4 is fixedly connected with the bottom of the piston rod 5, and the bottom end of the spring 7 is fixedly connected with the top of the tray 4. With such an arrangement, when an overpressure occurs in the fluid channel, the piston rod 5 will move the compression spring 7 upwards, and the spring 7 will hinder such compression; when the fluid passage is out of pressure, the piston rod 5 moves the tension spring 7 downward, and the spring 7 also resists the tension (the force due to the dead weight of the piston rod 5, the tray 4, etc. and the sliding friction of the piston rod 5 are small and negligible compared with those due to the over pressure and out of pressure, and therefore, these factors are ignored in the above operation and the following description, and will not be repeated. The application senses the pressure change of the fluid in the fluid channel of the pipeline main body 1 through the diaphragm 3, and has the advantages that the pressure sensing component is more sensitive to the pressure change of the fluid in the fluid channel, meanwhile, the blocking effect of the diaphragm 3 reduces the possibility that the fluid in the fluid channel enters the spring cavity 14, and the possible corrosion problem (such as when the fluid contains water or other acid gases and the like) is avoided.
Further preferably, the detecting column 22 is fixedly connected to the middle part above the casing 21, a sliding hole 221 is arranged in the detecting column 22 along the axial direction of the detecting column, the piston rod 5 extends into the sliding hole 221 after passing through the middle part of the casing 21 and is slidably arranged in the sliding hole 221, the detecting column 22 is provided with the detecting unit 10, and initially, the overpressure feedback point 8 and the pressure-loss feedback point 9 are positioned at two sides of the sensing direction of the detecting unit 10 (see fig. 1, the sensing direction of the detecting unit 10 is along the horizontal direction, and the overpressure feedback point 8 and the pressure-loss feedback point 9 are positioned at the upper side and the lower side of the horizontal plane where the detecting unit is positioned); when the piston rod 5 slides up and down under the action of the fluid pressure in the fluid channel, the overpressure feedback point 8 and the overpressure feedback point 9 provided on the piston rod 5 can be detected by the detection unit 10. The setting of the overpressure feedback point 8 and the depressurization feedback point 9 can ensure more accurate, timely and simple detection, and meanwhile, compared with the direct detection of the pressure value of the fluid, the method has lower requirements on a processing unit, for example, if the direct detection of the pressure value of the fluid is adopted for dynamic analysis, judgment and calculation, all the detected pressure values of the fluid need to be sent into the processing unit to be compared with the preset pressure value, and the process involves a large amount of data analysis, judgment and calculation; by setting the overpressure feedback point 8 and the depressurization feedback point 9, the application can send data to the processing unit only when the detection unit 10 detects the corresponding feedback point, and by way of example, the detection unit 10 can send data to the processing unit only when the detection unit 10 obtains a digital signal of 1 in the detection process when the feedback point is detected by the digital 1 and the feedback point is not detected by the digital 0, which is completely different from the mode of sending a pressure value in the prior art; in addition, as mentioned above, the existing common pressure sensor mode has the problem of insufficient sensitivity, if the existing common pressure sensor mode is required to respond in time when overpressure and pressure loss occur, the sensitivity and the precision of the adopted pressure sensor are required to be increased, and if the sensitivity and the detection precision are required to be improved, the cost is required to be increased.
Further preferably, the detection column 22 is formed with radial holes 222 penetrating through both sides of the sliding hole 221, the radial holes 222 on both sides are identical in shape and size and have the same central axis penetrating through the axle center of the detection column 22, the detection unit 10 is mounted in one radial hole 222 of the radial holes 222 on both sides, the diameter of the radial hole 222 is larger than that of the sliding hole 221, and a detection gap is formed between the detection unit 10 and the piston rod 5 in the sliding hole 221. It should be noted that, the detection unit 10 and the overpressure feedback point 8 and the depressurization feedback point 9 of the present application may detect by using technologies such as electromagnetic induction, position induction, and photoelectric induction, for example, the overpressure feedback point 8 and the depressurization feedback point 9 may be set in a groove form, and the positions may be detected by acoustic waves and feedback thereof, or the positions may be determined by setting magnetic blocks at corresponding positions and using magnetic signal sizes; however, the present application more preferably adopts an optoelectronic signal to detect, for example, the detection unit 10 sends out an optical signal, then uses different materials to absorb different light, and receives the reflected optical signal at the detection unit 10 by means of reflection of light, etc., so as to determine whether the corresponding feedback point is reached; in this way, the present application has a further advantage in that the radial hole 222 specially provided in the present application can facilitate the visual observation of the operator by means of the radial hole 222 located at the other side of the detecting unit 10 while the feedback point detection is being implemented, and determine whether the device is in the working state, for example, see fig. 8, by adopting the radial hole 222 provided in the present application, since the detecting unit 10 is installed in the radial hole 222 located at one side of the sliding hole 221 and the radial hole 222 is provided through both sides of the sliding hole 221, the radial hole 222 at the other side of the sliding hole 221 is empty, since the diameter of the radial hole 222 is larger than the diameter of the sliding hole 221 and the piston rod 5 slides in the sliding hole 221, the light emitted from the detecting unit 10 at the radial hole 222 cannot be completely blocked, and thus, when the light emitted from the detecting unit 10 is seen through the empty radial hole 222, the normal working state of the detecting unit 10 can be determined. Further, in order to prevent the influence of the external environment on the detecting unit 10 and the like, a top cover 6 is further provided on the upper portion of the housing 21, the top cover 6 covers the outside of the detecting column 22, and the top cover 6 is made of a transparent material such as a PC board.
In a preferred embodiment, a connecting column 215 is formed by extending upward from the middle of the upper part of the housing 21, and the detecting column 22 is screwed on the housing 21 through the connecting column 215, and the connecting column and the detecting column are detachably connected, so that maintenance and adjustment are facilitated.
In order to better achieve the object of the present application, in a preferred embodiment, referring to fig. 5, a piston chamber 214 for sliding the piston rod 5 is further provided at the middle part of the housing 21, a limiting plate 213 is fixedly provided at the bottom of the piston chamber 214 on the housing 21, the limiting plate 213 is slidably provided relative to the piston rod 5 (the limiting plate 213 is fixed, and the piston rod 5 slides up and down), as shown in fig. 6, the piston rod 5 includes a bottom plate 51, a screw part 52, a first sliding rod 53, a piston disc 54 and a second sliding rod 55 sequentially provided from bottom to top, wherein the tray 4 is fixedly connected to the bottom plate 51 of the piston rod 5 through the screw part 52, the middle part of the membrane 3 is clamped between the tray 4 and the bottom plate 51 (referring to fig. 1), in addition, the piston disc 54 is limited to slide in the piston chamber 214, the piston rod 5 is slidably provided at the middle part of the limiting plate 213 through the first sliding rod 53, and is slidably provided in the sliding hole 221 through the second sliding rod 55, the inner diameter of the piston chamber 214 is larger than the inner diameter of a through hole in which the middle part of the limiting plate 213 is slidably matched with the first sliding rod 53, and is larger than the top end of the piston chamber 214 is used to be matched with the second sliding rod 55, for limiting the length of the piston rod 5 in the vertical direction (see fig. 1, for example, which is limited by the sliding rod 55 and the sliding rod 5 is matched with the sliding rod 5 in the sliding hole in the vertical direction; the length of the piston chamber 214 is greater than or equal to the distance between the overpressure feedback point 8 and the overpressure feedback point 9, and initially the piston disc 54 is located in the middle of the piston chamber 214 in the vertical direction. For convenient installation, the limiting plate 213 is formed by splicing two semi-annular structures.
It should be noted that, since the overpressure feedback point 8 and the depressurization feedback point 9 need to be detected by the detection unit 10 when the piston rod 5 slides, when the length of the piston cavity 214 is exactly equal to the distance between the overpressure feedback point 8 and the depressurization feedback point 9 (here, the thickness of the piston disc 54 is ignored, for convenience of description of the principle), it is correspondingly available that the piston disc 54 moves to the top of the piston cavity 214, at this time, exactly corresponds to the overpressure feedback point 8 being detected by the detection unit 10, and at this time, exactly corresponds to the depressurization feedback point 9 being detected by the detection unit 10 when the piston disc 54 moves to the bottom of the piston cavity 214. In this embodiment, it is preferable that the length of the piston cavity 214 is slightly greater than the distance between the overpressure feedback point 8 and the pressure-loss feedback point 9, for example, the length L of the piston cavity 214 is 1.1 to 1.3 times the distance S between the overpressure feedback point 8 and the pressure-loss feedback point 9, or an additional length K is added to the length L of the piston cavity 214, that is, l= (1.1 to 1.3) ×s, or l=s+k. The additional length is set to provide a certain reserved travel, so as to avoid the situation that the overpressure feedback point 8 and the depressurization feedback point 9 cannot be detected by the detection unit 10 due to the installation precision and the like. In addition, the piston disc 54 of the piston rod is limited to slide in the piston cavity 214, so that the stroke of the piston rod 5 is limited, on the premise that the condition that the overpressure feedback point 8 and the depressurization feedback point 9 are detected by the detection unit 10 is met, the damage to the diaphragm 3 and the like caused by the sudden change of the natural pressure and the like can be avoided to a certain extent by limiting the stroke of the piston rod 5, for example, in the actual use process, the pressure in the fluid channel of the pipeline main body 1 can be in overpressure and depressurization, and meanwhile, the overpressure, the depressurization and the underpressure can be slowly formed or can be in sudden change, the diaphragm 3 is arranged to improve the sensitivity, but the diaphragm 3 is easy to be in fatigue failure or damage by limiting the stroke of the piston rod 5, the deformation amplitude of the diaphragm 3 can be limited to a certain extent, and a certain protection effect can be achieved. Furthermore, after the stroke of the piston rod 5 is limited within a predetermined range, it can be conveniently limited that the tip end face of the piston rod 5 is always located above the radial hole 222 during sliding. Since the diameter of the radial hole 222 is larger than the diameter of the sliding hole 221, if the stroke of the piston rod 5 is not limited, the pressure of the overpressure, the overpressure loss and the underpressure is not determined, and may be too large, so that the top end surface of the piston rod 5 is lower than the upper side of the radial hole 222 in the sliding process, if a sliding gap exists between the piston rod 5 and the sliding hole 221, and the natural gas pressure is unstable in all directions, when the piston rod 5 needs to restore to an initial state, that is, the top end of the piston rod 5 slides into the sliding hole 221 above the radial hole 222, the top end of the piston rod 5 may be blocked by the junction between the radial hole 222 and the sliding hole 221, and the limitation of the stroke of the piston rod 5 can avoid the problem.
In order to better achieve the object of the present application, a pressure sensor 15 (see fig. 10) for detecting the fluid pressure in the fluid passage on the upstream side of the solenoid valve 11 is further provided on the upstream side of the solenoid valve 11, the pressure sensor 15 being connected to the control unit, and the pressure sensor 15 being activated for pressure data collection only when the fluid passage of the pipe body 1 is closed by the solenoid valve 11; after the solenoid valve 11 is closed, the control unit controls the solenoid valve 11 to open if and only if the pressure data collected by the pressure sensor 15 is maintained within a predetermined pressure range for a predetermined time (for example, both maintained at 2.3 to 2.6kpa in 2 minutes) and the overpressure feedback point 8 and the depressurization feedback point 9 are not detected by the detection unit 10.
In the prior art, when the on-off control of the valve is performed, a pressure sensing device is usually disposed on the upstream side of the shut-off valve (corresponding to the electromagnetic valve 11 of the present application), the pressure sensing device needs to perform pressure detection on the upstream side of the shut-off valve before and after the shut-off valve is closed, so that the on-off of the shut-off valve is performed by the data detected by the pressure sensing device. The pressure sensing assembly with the diaphragm 3 is suitable for pressure detection in a low-pressure environment, is more sensitive than a conventional pressure sensing device in the low-pressure environment, has low cost, is suitable for popularization in a domestic natural gas household pipeline, is easy to damage due to low pressure resistance, the pressure sensing assembly with the diaphragm 3 is arranged on the downstream side of the pipeline main body 1, and the electromagnetic valve 11 is arranged on the upstream side (the pressure resistance of the electromagnetic valve 11 is relatively high in general), so that when overpressure and pressure loss occur, the overpressure and the pressure loss phenomenon can be quickly captured by the pressure sensing assembly with the diaphragm 3, further, the electromagnetic valve 11 can be quickly closed, and after the electromagnetic valve 11 is closed, the overpressure and the pressure loss caused by the upstream side cannot continuously act on the diaphragm 3 of the pressure sensing assembly on the downstream side, so that the pressure sensing assembly is protected, and when the electromagnetic valve 11 is closed, the pressure sensor 15 positioned on the upstream of the electromagnetic valve 11 is started by the control unit, and the pressure sensor 15 does not need to be used for quickly responding to the pressure data acquisition and does not need to be used for the pressure sensor 11, so that the problem of high accuracy is not required to be solved, and the problem of the conventional pressure sensor is not required to be used. In addition, the data can be sent to the processing unit only when the detection unit 10 detects the corresponding feedback point through the arrangement of the overpressure feedback point 8 and the depressurization feedback point 9, meanwhile, the pressure sensor 15 can be started only when the electromagnetic valve 11 is closed, and a large amount of data analysis, comparison and calculation are not needed, so that the device has low requirements on the data processing capability of the control unit, and an MCU singlechip for autonomous control can be directly arranged near the electromagnetic valve 11.
As a further preferred embodiment, the application also relates to a method for sizing an overpressure feedback point 8 and a pressure-loss feedback point 9, comprising (see fig. 9):
s1, carrying out stress analysis in an initial state and a normal working state:
in the initial state, the detection unit 10 is aligned to the initial position, and the forces on two sides of the diaphragm 3 are respectively: the spring 7 acts on the downward thrust F generated by the diaphragm 3 1 And the upward thrust F generated by the natural gas acting on the membrane 3 2 ；
Under the normal working state, the natural gas thrust and the spring thrust are mutually opposite, and always keep balance and equal;
thus has:
F 1 = F 2 ……（1），
F 1 =kx……（2），
……（3），
wherein k is the spring rate, N/mm; x is the compression amount of the spring, and mm; p is the gas pressure value of natural gas, bar; d is the effective stress diameter of the membrane, cm;
s2, carrying out stress analysis under an overpressure state:
when an overpressure occurs, the detection unit 10 is aligned with the overpressure position, displaced by h1 (spring compression amount increased h 1) with respect to the initial position, and the natural gas pressure value P rises to become P u ，
Natural gas thrust at overpressure:
……（4），
the spring thrust in the overpressure condition becomes:
……（5），
because the spring thrust and the natural gas thrust are balanced with each other under the overpressure condition, the natural gas pressure,substitution formula (4) and formula (5) can be obtained:
，
then the first time period of the first time period,
……（6），
s3, carrying out stress analysis in a decompression state:
when the decompression occurs, the detection unit 10 is aligned with the decompression position, displaced from the initial position by h2 (the spring compression amount decreases by h 2), the natural gas pressure value P decreases, and becomes P d ，
Natural gas thrust in the decompression state:
……（7），
the spring thrust in the decompression state becomes:
……（8），
because the spring thrust and the natural gas thrust are balanced with each other in the decompression state,substitution formula (7) and formula (8) can be obtained:
，
then the first time period of the first time period,
……（9）；
s4, determining positions of an overpressure feedback point 8 and a depressurization feedback point 9:
substituting the overpressure air pressure value and the pressure-losing air pressure value which need to be set into the formula (6) and the formula (9) respectively, calculating displacement variable quantities h1 and h2 of the spring 7 under the overpressure and pressure-losing states, determining an initial position according to the position relation between the initial detection unit 10 and the piston rod 5, and determining the positions of the overpressure feedback point 8 and the pressure-losing feedback point 9 according to the initial position and the displacement variable quantities h1 and h2, so that the dimension and the structure of the overpressure detection and the pressure-losing detection are satisfied.
Finally, it is further noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A household intelligent full-effect safety device at least comprising a pipeline main body (1), an electromagnetic valve (11) and a pressure sensing assembly, wherein a fluid channel for fluid to flow is formed in the pipeline main body (1), the electromagnetic valve (11) and the pressure sensing assembly are both arranged on the pipeline main body (1) and are both communicated with the fluid channel of the pipeline main body (1), the electromagnetic valve (11) is positioned on the upstream side of the pipeline main body (1) in the direction of fluid flow, the pressure sensing assembly is positioned on the downstream side of the pipeline main body (1), the electromagnetic valve (11) and the pressure sensing assembly are both connected to a control unit, and the pressure sensing assembly comprises a piston rod (5), an overpressure feedback point (8), a pressure loss feedback point (9) and a detection unit (10), the overpressure feedback point (8) and the pressure loss feedback point (9) are both arranged on the piston rod (5), the piston rod (5) can slide under the pressure of fluid in the fluid channel, the overpressure feedback point (8) and the pressure loss feedback point (9) can be detected by the detection unit (10) when the piston rod (5) slides, and the overpressure feedback point (8) and the pressure loss feedback point (9) can be detected by the control unit (11) when the control unit is closed;
an opening (13) is formed in the pipeline main body (1), the pressure sensing assembly is arranged at the opening (13), the pressure sensing assembly further comprises a cover body (2), a diaphragm (3), a tray (4) and a spring (7), the cover body (2) comprises a shell (21) which is downwards opened and a detection column (22) which is arranged in the middle of the upper part of the shell (21), the shell (21) is connected to the pipeline main body (1) through a connecting part (211) on the outer side of the bottom of the shell, the diaphragm (3) spans the opening (13), the outer edge of the diaphragm (3) is clamped between the bottom of the shell (21) and the pipeline main body (1), the middle of the diaphragm (3) is fixedly connected to the bottom of a piston rod (5) through a tray (4), the diaphragm (3) can deform along with the change of fluid pressure in a fluid channel of the pipeline main body (1) so as to drive the piston rod (5) to deviate from the initial position of the piston rod, a spring cavity (14) is formed between the diaphragm (3) and the shell (21), the spring cavity (14) is isolated from the opening (13), the outer edge of the diaphragm (3) is clamped with the opening (13), the outer edge of the diaphragm (7) is clamped between the piston rod and the piston rod (7) can deviate from the initial position of the piston rod (7);
the detection column (22) is fixedly connected to the middle part above the shell (21), a sliding hole (221) arranged along the axial direction of the detection column is formed in the detection column (22), the piston rod (5) extends into the sliding hole (221) after passing through the middle part of the shell (21) and is slidably arranged in the sliding hole (221), the detection column (22) is provided with a detection unit (10), and initially, an overpressure feedback point (8) and a decompression feedback point (9) are positioned on two sides of the induction direction of the detection unit (10); when the piston rod (5) slides up and down under the action of the fluid pressure in the fluid channel, an overpressure feedback point (8) and a pressure-losing feedback point (9) which are arranged on the piston rod (5) can be detected by the detection unit (10);
the detection column (22) is provided with radial holes (222) penetrating through two sides of the sliding hole (221), the radial holes (222) on the two sides are identical in shape and size and have the same central axis penetrating through the axle center of the detection column (22), the detection unit (10) is installed in one radial hole (222) on one side of the radial holes (222) on the two sides, the diameter of the radial hole (222) is larger than that of the sliding hole (221), and a detection gap is formed between the detection unit (10) and a piston rod (5) in the sliding hole (221);
the detection unit (10) adopts photoelectric signals to detect, and when the detection unit (10) detects an overpressure feedback point (8) and a pressure-losing feedback point (9) on the piston rod (5), the detection unit (10) can emit optical signals, and part of the optical signals can be observed through a radial hole (222) on the side opposite to the detection unit (10).
2. The household intelligent full-effect safety device according to claim 1, wherein a piston cavity (214) for sliding the piston rod (5) is further arranged in the middle of the shell (21), a limiting plate (213) is fixedly arranged at the bottom of the piston cavity (214) on the shell (21), and the limiting plate (213) and the piston rod (5) are arranged in a sliding mode.
3. A household intelligent full-effect safety device according to claim 2, characterized in that the piston rod (5) comprises a bottom plate (51), a screw connection part (52), a first sliding rod (53), a piston disc (54) and a second sliding rod (55) which are sequentially arranged from bottom to top, wherein the tray (4) is fixedly connected to the bottom plate (51) of the piston rod (5) through the screw connection part (52), the middle part of the membrane (3) is clamped between the tray (4) and the bottom plate (51), the piston disc (54) is limited to slide in the piston cavity (214), the piston rod (5) is arranged in the middle part of the limiting plate (213) in a sliding way through the second sliding rod (55), the inner diameter of the piston cavity (214) is larger than the inner diameter of a through hole in which the middle part of the limiting plate (213) is in sliding fit with the first sliding rod (53) and is larger than the inner diameter of a through hole in which the top end of the piston cavity (214) is in sliding fit with the second sliding rod (55), and the piston rod (5) is limited in the vertical direction by the vertical length of the piston cavity (214); wherein the length of the piston cavity (214) is greater than or equal to the distance between the overpressure feedback point (8) and the pressure-loss feedback point (9), and initially the piston disc (54) is located in the middle of the piston cavity (214) in the vertical direction.
4. A household intelligent full-effect safety device according to claim 3, characterized in that the top end face of the piston rod (5) is always located above the radial hole (222) during sliding.
5. A household intelligent full-effect safety device according to claim 1, characterized in that a pressure sensor (15) for detecting the fluid pressure in the fluid channel on the upstream side of the solenoid valve (11) is provided on the upstream side of the solenoid valve (11), the pressure sensor (15) being connected to the control unit, and the pressure sensor (15) being activated for pressure data acquisition only when the fluid channel of the pipe body (1) is closed by the solenoid valve (11); after the solenoid valve (11) is closed, the control unit controls the solenoid valve (11) to open if and only if the pressure data acquired by the pressure sensor (15) is maintained within a predetermined pressure range for a predetermined time and the pressure feedback point (8) and the pressure loss feedback point (9) are not detected by the detection unit (10).
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