CN113464697A - Cut-off valve and zirconia oxygen analyzer explosion-proof detector comprising same - Google Patents
Cut-off valve and zirconia oxygen analyzer explosion-proof detector comprising same Download PDFInfo
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- CN113464697A CN113464697A CN202110716824.9A CN202110716824A CN113464697A CN 113464697 A CN113464697 A CN 113464697A CN 202110716824 A CN202110716824 A CN 202110716824A CN 113464697 A CN113464697 A CN 113464697A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 74
- 239000001301 oxygen Substances 0.000 title claims description 74
- 229910052760 oxygen Inorganic materials 0.000 title claims description 74
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 title claims description 72
- 238000007789 sealing Methods 0.000 claims abstract description 31
- 230000000903 blocking effect Effects 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 description 51
- 230000001681 protective effect Effects 0.000 description 19
- 238000004880 explosion Methods 0.000 description 16
- 238000002485 combustion reaction Methods 0.000 description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 239000003546 flue gas Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 10
- 239000002360 explosive Substances 0.000 description 9
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 9
- 229910001928 zirconium oxide Inorganic materials 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000002265 prevention Effects 0.000 description 6
- 239000000779 smoke Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000003889 chemical engineering Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000001629 suppression Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010416 ion conductor Substances 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- -1 pharmacy Substances 0.000 description 1
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- 239000002699 waste material 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
-
- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/409—Oxygen concentration cells
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- General Engineering & Computer Science (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
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Abstract
The invention relates to a shut-off valve which comprises a valve main body, wherein a first hole, a second hole, a third hole and a fourth hole are sequentially arranged in the valve main body in the axial direction, the diameter of the first hole is smaller than that of the second hole, the third hole is in a circular truncated cone shape, one end with the smaller diameter is connected with the second hole, and the minimum diameter of the third hole is larger than that of the first hole; a reference air inlet is arranged on the valve main body; the valve comprises a valve body and is characterized in that a piston is arranged in the valve body, the piston comprises a piston head and a rod body, the rod body is connected with a first hole in a sliding mode and in a sealing mode, a sliding block is arranged in the first hole, the sliding block is connected with the first hole in a sliding mode, a spring is arranged between the sliding block and the rod body, an adjusting piece is arranged at one end, close to the sliding block, of the valve body, the other end of the valve body is connected with a blocking body, a reference air outlet is formed in the blocking body, and a limiting structure is arranged between the piston head and the blocking body. The cut-off valve provided by the invention ensures that the reference air in the detector protection tube is unblocked with the air outside the detector protection tube, and realizes the explosion-proof and explosion-proof functions.
Description
Technical Field
The invention belongs to the technical field of control devices, and particularly relates to a cut-off valve and an explosion-proof detector of a zirconia oxygen analyzer comprising the cut-off valve.
Background
The oxygen content analyzer is a practical and reliable automatic analyzer for oxygen content in flue gas on line. The device is mainly used in flues of various combustion equipment such as boilers, kilns, oil furnaces, steam furnaces and the like which use natural coal, diesel oil and natural gas as fuels in the industries such as petroleum, electric power, metallurgy, chemical industry, glass, pharmacy, textile and the like, monitors the residual oxygen content of the flue gas generated in the combustion process of the fuels, and scientifically masters the combustion degree of the fuels in the combustion equipment so as to achieve the purposes of reducing waste, reducing energy consumption, purifying the flue gas, reducing environmental pollution and protecting the environment.
The oxygen content analyzer for zirconium oxide consists of a primary oxygen content detector (commonly called oxygen sensor) and a secondary controller (display instrument, commonly called oxygen transmitter). The primary oxygen content detector is inserted into a flue of flue gas discharged by a boiler to analyze the oxygen content of the contacted flue gas, and outputs a mV value (oxygen potential) corresponding to the oxygen content of the flue gas to a secondary instrument for processing various functions. Most industrial production processes can not provide power without a boiler, and environments polluted by various chemical engineering, chemical engineering and flammable and explosive complex gases have special functional requirements on field industrial measurement control instruments, namely, the explosion-proof and explosion-proof functions. The working place of the zirconia oxygen analyzer is inevitably arranged in each process link of the boiler smoke discharge, is in a very severe working place, and is essential to the explosion prevention and explosion suppression function when working in various chemical engineering, chemical and flammable and explosive complex gas polluted environments.
The explosion-proof and explosion-proof technical measures of the general field industrial process control instrument generally adopt reliable sealing measures for the instrument to isolate an explosion source possibly generated in the instrument from inflammable and explosive gas outside the instrument, thereby achieving the purposes of explosion prevention and explosion insulation. The secondary instrument of the zirconia oxygen analyzer adopts the simple and easy explosion-proof device, but the primary instrument, namely the explosion-proof technology of the oxygen detector can not directly adopt sealing measures, and the specific reasons are as follows:
zirconium oxide (ZrO)2) Is a ceramic, a solid with ion conducting properties. The ZrO2 crystal is monoclinic crystal at normal temperature, and when the temperature reaches over 600 degrees (700 degrees is actually applied in the industry), the ZrO2 becomes a good oxygen ion conductor. When the oxygen partial pressures on both sides of zirconia are different, oxygen on the side with a high oxygen partial pressure migrates in the form of ions to the side with a low oxygen partial pressure, so that the platinum electrode on the side with a high oxygen partial pressure loses electrons and becomes positively charged, and the platinum electrode on the side with a low oxygen partial pressure gains electrons and becomes negatively charged, thereby generating an oxygen concentration potential between the two platinum electrodes. This potential is only related to the difference in oxygen content (oxygen concentration difference) in the gases on both sides at a certain temperature. If the oxygen content of one side is known (for example, the oxygen content in the air is constant), the oxygen content of the other side (for example, the oxygen content in the flue gas) can be represented by an oxygen concentration potential, and the oxygen content in the flue gas can be known by measuring the potential. The oxygen content in the flue gas can be calculated by the oxygen concentration difference potential by applying the Nernst equation.
As described above, the zirconia oxygen analyzer normally operates under two conditions: 1. the zirconia oxide sensor as a sensor must be heated above 600 ° (700 ° is a practical application in the industry) before the zirconia oxide can become a cationic conductor. 2. The oxygen partial pressure on both sides of the zirconia must be different, so that the oxygen on the side with high oxygen partial pressure can migrate to the side with low oxygen partial pressure in the form of ions, thereby generating an oxygen concentration potential between the two platinum electrodes, namely the oxygen mV value which needs to be acquired by the meter. The oxygen partial pressure at the two sides of the zirconia is respectively air (namely reference gas) and trace oxygen in the smoke to be detected. Because the oxygen content of the air is different from that of the detected smoke, an oxygen concentration difference potential is formed.
Under the normal working state of the zirconia oxygen analyzer, namely the zirconia sensor is heated to 700 ℃ and enters the normal working state, the oxygen content (air) of the reference gas at the two sides of the sensor and the trace oxygen contained in the measured smoke can safely flow under the high temperature state.
As mentioned above, most industrial production processes can not provide power for boilers, and environments polluted by various chemical engineering, chemical engineering and flammable and explosive complex gases have special functional requirements on a zirconia oxygen analyzer working on site, namely the explosion-proof and explosion-proof functions. In the environment that air is mixed with inflammable and explosive pollutants, reference air which is required to be input when the instrument works normally can cause combustion or explosion once meeting red electric heaters, but the combustion or the explosion at the moment is only limited in a limited space in an instrument protection tube, but if the reference air mixed with the inflammable and explosive pollutants is not closed immediately, the reference air combusted and exploded in the tube can rapidly diffuse to the inflammable and explosive environment air polluted outside the protection tube, and malignant safety accidents can be caused.
The technical characteristics of normal operation of the zirconia oxygen analyzer determine the special technical requirements of explosion prevention and explosion suppression of the analyzer, namely, the fixed sealing structure can not be adopted to meet the functional requirements of explosion prevention and explosion suppression by adopting the traditional sealing means. The zirconia oxygen analyzer can not work without inputting reference air, otherwise, the zirconia can not form oxygen concentration potential, and therefore, the zirconia can not be directly closed by sealing measures for air. On the basis, people are constantly researching how to realize the explosion-proof and explosion-proof functions of the zirconia oxygen analyzer.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a shut-off valve to solve the above problems.
In order to achieve the above object, the present invention provides a technical solution as follows:
a shut-off valve comprises a valve body, wherein a first hole, a second hole, a third hole and a fourth hole are sequentially arranged in the valve body in the axial direction, the first hole, the second hole, the third hole and the fourth hole are connected into a whole, the diameter of the first hole is smaller than that of the second hole, the third hole is in a circular truncated cone shape, one end with the smaller diameter is connected with the second hole, and the minimum diameter of the third hole is larger than that of the first hole; a reference air inlet communicated with the second hole is arranged on the valve main body at a position corresponding to the second hole; the valve comprises a valve body and a valve body, wherein a piston is arranged in the valve body, the piston comprises a piston head and a rod body, the piston head is connected with the rod body, the shape of the piston head is matched with that of a third through hole, so that the piston can block the third through hole, the rod body penetrates through a fourth hole, a third hole and a second hole to be in sliding connection and sealing connection with the first hole, a sliding block is arranged in the first hole and is positioned on one side, away from the piston head, of the rod body, the sliding block is in sliding connection with the first hole, a spring is arranged between the sliding block and the rod body, one end, close to the sliding block, of the valve body is provided with an adjusting piece used for adjusting the sliding block to move back and forth, the other end of the valve body is connected with a blocking body, a reference air outlet communicated with the fourth through hole is arranged on the blocking body, and a limiting structure is arranged between the piston head and the blocking body, so that there is a spacing between the piston head and the reference air outlet.
Preferably, the diameter of the second hole is smaller than the diameter of the fourth hole, the minimum diameter of the third hole is the same as the diameter of the second hole, and the maximum diameter of the third hole is the same as the diameter of the fourth hole.
Preferably, the slider is connected with the first hole in a sealing manner, and a fifth hole communicated with the first hole is formed in the valve main body at a position corresponding to the spring.
Preferably, the piston head comprises a sealing part and a supporting part, the sealing part is connected with the supporting part, the sealing part is in a circular truncated cone shape, and one end with a smaller diameter is connected with the rod body; the minimum diameter of the sealing part is the same as that of the rod body, the supporting part is cylindrical, and the maximum diameter of the sealing part is the same as that of the supporting part; the diameter of the support portion is greater than the minimum diameter of the third bore and less than the maximum diameter of the third bore.
Preferably, the blocking body is a flange, and the limiting structure is a limiting pin arranged on the piston head.
Preferably, a hollow screw is mounted on the reference air inlet, and an air filter is mounted on the hollow screw.
Preferably, the adjusting piece comprises a nut and a bolt, and the bolt is in threaded connection with the nut; one end of the valve main body, which is close to the sliding block, is provided with a threaded hole matched with the bolt, and the bolt penetrates through the threaded hole to abut against the sliding block.
Preferably, the bolt, the first through hole, the second through hole, the third through hole, the fourth through hole, the piston head, the rod body and the reference air outlet are coaxially arranged.
Preferably, the valve main body is provided with an internal thread hole communicated with the fourth hole, the internal thread hole is coaxially arranged with the fourth hole, and the blocking body is provided with an external thread matched with the internal thread hole.
The stop valve provided by the invention is communicated with the reference air outlet and the detector protection pipe when used for a zirconia oxygen analyzer, the structure does not adopt a direct sealing means, so that the smoothness of the reference air in the detector protection pipe and the air outside the detector protection pipe is ensured, and only when the combustible reference gas which is possibly polluted and input due to high temperature in the detector protection pipe is combusted, the piston head is blocked due to the increased pressure on the right side of the piston head, so that the technical purposes of separating a combustion source in the pipe from the combustible air environment outside the pipe and realizing the explosion-proof and explosion-proof functions are achieved.
The invention provides a technical scheme as follows:
the utility model provides an explosion-proof detector of zirconia oxygen analyzer, includes explosion-proof terminal box, detector protection tube and connector, the one end of connector with explosion-proof terminal box is connected, the other end with the detector protection tube is connected, install foretell trip valve on the connector, the reference air outlet of trip valve with detector protection tube intercommunication.
The explosion-proof detector of the zirconia oxygen analyzer provided by the invention is provided with the cut-off valve in the embodiment 1, so that the smoothness of the reference air in the detector protection tube and the air outside the detector protection tube can be ensured, and for the convenience of observation, the flowing direction of the reference air in a normal state is shown by two small hollow arrows in the figure; when the detector protects the inside of the tube from high temperature and possibly causes the input combustible reference gas which is polluted to burn, the stop valve is quickly closed, the purpose of separating the combustion source in the tube from the combustible air environment outside the tube is achieved, the explosion-proof and explosion-proof functions are realized,
drawings
FIG. 1 is a schematic view showing the structure of a shut valve in embodiment 1;
FIG. 2 is a schematic structural view of a valve body in embodiment 1;
FIG. 3 is a schematic structural view of a piston in embodiment 1;
FIG. 4 is a schematic diagram showing the structure of an explosion-proof detector of the oxygen analyzer of zirconium oxide in example 2;
FIG. 5 is a schematic view showing the structure of an explosion-proof detector of the oxygen analyzer of zirconium oxide in example 2;
reference numerals in the figures; the valve comprises a valve body 1, a first hole 1-1, a second hole 1-2, a third hole 1-3, a fourth hole 1-4, a fifth hole 1-5, a reference air inlet 1-6, an internal threaded hole 1-7, a slider 2, a spring 3, a piston 4, a piston head 4-1, a rod body 4-2, a sealing part 4-11, a supporting part 4-12, a hollow screw 5, a limiting pin 6, a blocking body 7, a reference air outlet 7-1, a nut 8, a bolt 9, a rear valve seat 10, a connecting sleeve 11, an air filter 12, a smoke filter 101, a zirconium oxide sensor 102, a zirconium oxide sensor constant temperature heater 103, a detector protecting pipe 104, a user connecting flange 105, a detector fixing flange 106, a terminal box 109, a user access cable 113, a connecting head 116 and a test port joint 117.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. 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 invention.
Embodiment 1, the present invention provides a shut-off valve, see fig. 1 to 3, including a valve body 1 having a first hole 1-1, a second hole 1-2, a third hole 1-3 and a fourth hole 1-4 arranged therein in the axial direction in sequence, the first hole, the second hole, the third hole and the fourth hole being connected as a whole, the first hole having a diameter smaller than that of the second hole, the third hole having a truncated cone shape, the smaller end being connected to the second hole, and the smallest diameter (i.e., the diameter of the smallest diameter end) of the third hole being larger than that of the first hole; a reference air inlet 1-6 communicated with the second hole is arranged on the valve main body at a position corresponding to the second hole; a piston 4 is arranged in the valve main body and comprises a piston head 4-1 and a rod body 4-2, the piston head is connected with the rod body, the shape of the piston head is matched with that of the third through hole, so that the piston can block the third through hole, the rod body penetrates through the fourth hole, the third hole and the second hole to be in sliding connection and sealing connection with the first hole, a sliding block 2 is arranged in the first hole and is positioned on one side, away from the piston head, of the rod body, the sliding block is in sliding connection and sealing connection with the first hole, a spring 3 is arranged between the sliding block and the rod body, a fifth hole 1-5 communicated with the first hole is arranged in the position, corresponding to the spring, of the valve main body, and an adjusting piece used for adjusting the sliding block to move back and forth is arranged at one end, close to the sliding block, of the valve main body, the other end of the valve body is connected with a blocking body 7, a reference air outlet 7-1 communicated with the fourth through hole is formed in the blocking body, and a limiting structure is arranged between the piston head and the blocking body, so that a distance is formed between the piston head and the reference air outlet.
In this embodiment, the mounting structure of the blocking body may use the structure shown in fig. 1 and fig. 2, specifically, the valve main body is provided with internal threaded holes 1-7 communicated with the fourth hole, the internal threaded hole and the fourth hole are coaxially arranged, the blocking body is provided with external threads matched with the internal threaded hole, and the valve main body and the blocking body are connected by threads; in this application, the blocking body may be a flange, the limiting structure is a limiting pin 6 disposed on the piston head, of course, the limiting pin may also be disposed on the blocking body, and the limiting structure may also be a protrusion directly disposed on the blocking body or the piston head, as long as the purpose of the present invention can be achieved, and the purpose is not specifically limited herein.
In order to achieve better blocking effect and improve the sensitivity of the shut-off valve, the diameter of the second hole is smaller than that of the fourth hole, the minimum diameter of the third hole is the same as that of the second hole, and the maximum diameter of the third hole (i.e. the diameter of the end with the largest diameter) is the same as that of the fourth hole; the piston head comprises a sealing part 4-11 and a supporting part 4-12, the sealing part is connected with the supporting part, the sealing part is in a circular truncated cone shape, and one end with a smaller diameter is connected with the rod body; the minimum diameter of the sealing part is the same as that of the rod body, the supporting part is cylindrical, and the maximum diameter of the sealing part is the same as that of the supporting part; the diameter of the support portion is greater than the minimum diameter of the third bore and less than the maximum diameter of the third bore; the first through hole, the second through hole, the third through hole, the fourth through hole, the piston head, the rod body and the reference air outlet are coaxially arranged.
In order to provide reference air into the reference air inlet conveniently, a hollow screw 5 (also called as a hollow screw) is installed on the reference air inlet, and an air filter 12 is also installed on the hollow screw to shield dust and large particles in the air, in this embodiment, the air filter can be connected with the hollow screw by a connecting sleeve 11.
In this embodiment, the adjusting member includes a nut 8 and a bolt 9, the bolt is in threaded connection with the nut, a threaded hole matched with the bolt is formed in one end, close to the slider, of the valve body, the bolt penetrates through the threaded hole and abuts against the slider, when the valve body is used, the pressure of the spring can be adjusted through the bolt, the nut is used for strengthening and fixing after the adjustment is completed, and the bolt can also adopt a screw, a knob and other structures. The following is the method for adjusting the distance between the piston head and the reference air outlet (i.e. the air gap distance between the right end face (also called large end face) of the piston in fig. 1 and the inner end face (left end face) of the blocking body in the figure):
1) the check valve main body middle piston is in a free state before adjustment, namely can move freely in the axial direction and is not controlled by pressure in any direction.
2) The adjusting part is composed of a bolt and a nut, the nut is loosened, then the bolt is slightly screwed, and the piston is confirmed to move towards the large end face and is finally abutted.
3) The large end face of the piston is pressed against by the axial static pressure of the miniature spring dynamometer, the piston is observed to move by the force of the dynamometer, the piston stops moving, the spring dynamometer shows that the pressure is preferably 20-30kP, if the pressure is too small or too large, the bolt is adjusted, and finally the nut is tightened.
In order to facilitate the installation of the slider, in this embodiment, the valve main body is separately screwed to the rear valve seat 10, and the bolt is disposed on the rear valve seat.
In this embodiment, the design of the piston and the third bore takes advantage of pascal's law:
wherein F1/S1 ═ F2/S2 formula 1
The ratio is equal as shown in formula 1, and in engineering application, S1 is the small end area, and F1 is the total force of the small end. S2 is the area of the large end, and F2 is the total force of the large end. Equation 1 indicates that the pressures on both sides are equal.
Formula 1 after deformation: (F1/S1) × S2 formula 2F 2 ═ F1/S1
In the present invention, formula 2: f1 is the total force of the small end of the piston head, and F2 is the total force of the large end of the piston head. When the ratio F1/S1, namely the pressure, is changed in an increasing way, F2 can obtain an increase of S2 times. S1 is the small end stress area of the piston, S2 is the large end stress area of the piston, and the actual area of S2 is n times the actual area of S1. It can be seen that the slight change of the F1/S1 value satisfies the condition of formula 2, and the F2 can be increased by n times.
When the pressure in the front of the big end of the piston end is changed (increased), the total stress amount of the piston end is larger than the total actual stress amount of the back of the valve core, so that the valve core piston is pushed to move towards the back of the big end until the valve port is closed, and a channel for fluid medium circulation in the valve body is cut off.
The working principle of the cut-off valve of the invention is as follows:
under the action of the spring, the piston moves towards the piston head, and finally is stopped at the inner end face of the blocking body of the blocking piece under the action of the limiting pin, so that the air gap distance between the piston head and the blocking body is always kept, a channel for fluid medium to flow is formed, and the smoothness of fluid medium inflow is ensured.
In normal working state, under the same pressure, because the actual force-bearing area on the right of the piston head is larger than the actual force-bearing area on the left of the piston head, the valve is theoretically pushed to the left, and after the whole stroke is completed, the valve port is closed. In order to obtain a channel for the valve core piston to always keep the fluid medium flowing, a counter force needs to be added at one end of the piston rod, which is far away from the piston head, so as to balance the thrust on the right side of the piston head, and the adjusting piece bolt can increase the pretightening force of the compression spring and reversely push the piston to push to the right, so that the flowing channel of the flowing medium of the valve is kept.
When the pressure on the right side of the piston head of the piston is increased, the established force balance on the two sides of the piston head is broken, and the valve core moves towards the back side of the piston head until the valve port is closed, so that the aim of automatically cutting off the medium flow channel is fulfilled.
When the cut-off valve is used for a zirconia oxygen analyzer, the cut-off valve is communicated with a reference air outlet and a detector protection tube, the structure does not adopt a direct sealing means, so that the smoothness of reference air in the detector protection tube and air outside the detector protection tube is ensured, only when combustible reference gas which is possibly polluted and input due to high temperature in the detector protection tube is combusted, the piston head is blocked due to the increased pressure on the right side of the piston head, the cut-off of a combustion source in the tube and the combustible air environment outside the tube is realized, and the technical purpose of explosion prevention and explosion suppression is realized.
Embodiment 2, the present invention further provides an explosion-proof detector for a zirconia oxygen analyzer, comprising an explosion-proof junction box 109, a detector protection tube 104 and a connector 116, wherein the connector can use the existing structure, such as a flange, one end of the connector is connected with the explosion-proof junction box, the other end of the connector is connected with the detector protection tube, one end of the detector protection tube, which is not connected with the connector, is provided with a flue gas filter 101, a position in the detector protection tube, which is close to the flue gas filter, is provided with a zirconia sensor 102 and a zirconia sensor constant temperature heater 103, for convenience of fixing, the detector protection tube is welded with a detector fixing flange 106, the detector fixing flange is sleeved on the detector protection tube and is welded with the detector protection tube, when in use, the detector fixing flange is fixed on a flue wall through a user connection flange 105, the explosion-proof junction box is provided with a user access cable 113, a user access cable penetrates through the connector to be connected with the flue gas filter, the zirconia sensor and the zirconia sensor constant temperature heater; install foretell trip valve on the connector, the reference air outlet of trip valve with the detector protection tube intercommunication, the detector protection tube is close to the position installation of the reference air outlet of trip valve and is used for carrying compressed air's test port joint 117, and the test port connects and can use current joint, for example uses hollow screw or installs air cleaner's hollow screw structure.
The explosion-proof detector of the zirconia oxygen analyzer is provided with the cut-off valve in the embodiment 1, so that the smoothness of the reference air in the detector protection tube of the zirconia oxygen analyzer and the air outside the detector protection tube can be ensured, and for the convenience of observation, two small hollow arrows in the figure show the flowing direction of the reference air in a normal state; when the detector protects the inside of the tube from high temperature and possibly causes the combustion of the input combustible reference gas which is polluted, the stop valve is closed quickly, the purpose of separating the combustion source in the tube from the combustible air environment outside the tube is achieved, the explosion-proof and explosion-proof functions are achieved, and for the convenience of observation, the flowing direction of the reference air during the combustion of the combustible reference gas is shown by a small solid arrow in the figure.
The operation principle of the structure conforms to Charles' law: under the condition that the volume of certain gas is not changed, the pressure intensity is in direct proportion to the thermodynamic temperature, in the embodiment (see attached figure 4), a zirconium oxide sensor and a zirconium oxide sensor constant-temperature electric heater are assembled in a detector protection tube, and the zirconium oxide sensor end in the inner cavity of the protection tube is a blind end; the other end of the protection tube is provided with a cut-off valve and an explosion-proof junction box, and the end communicated with the air is obtained by utilizing an air gap set in the cut-off valve. In the invention, because the working temperature of the constant-temperature electric heater of the zirconia sensor is 700 degrees and the constant-temperature electric heater works in the protective tube with a small space, according to the Charles' law, the volume of the space air in the protective tube in a heating state is different from the volume of the air outside the protective tube, undoubtedly, the volume of the air in the protective tube is increased, and the internal pressure of the air is also increased. When the detector works under normal high-temperature conditions, the pressure difference of air inside and outside the protective pipe is balanced and set by the pretightening force of a spring at the tail part of the valve body of the stop valve. When the working temperature of the electric heater in the protective tube is 700 degrees, the heater is in an incandescent state, and in the incandescent state of 700 degrees in air, the heater is safe to work, but substances with low melting points can be burnt when being touched. Similarly, a flammable oxygen-enriched gas or other flammable gas will also burn immediately upon flowing into an electric heater that touches such a 700 ° incandescent state. Because the air gap (namely the second hole) of the cut-off valve is a channel communicated with the air inside and outside the protective tube, when the air outside the protective tube generates flammable and explosive dangerous gas, the gas can flow into the protective tube along the air gap of the overpressure cut-off valve under the condition, when the flowing dangerous gas touches the electric heater heated to the incandescent state, the dangerous gas can be immediately combusted, the combusted gas can instantly increase the temperature and the volume of the gas inside the protective tube, according to the laws of inquiry, the pressure of the combusted high-temperature gas inside the protective tube is increased, the high-pressure gas can push the large-end piston of the cut-off valve, the pressure balance point at two ends of the originally set piston is broken, the large-end piston moves to the small end, and finally the air gap of the valve is closed, and because the air gap communicated between the inside and the outside is closed, the supplement inflow of the dangerous gas is cut off, and the technical purpose of explosion suppression and explosion prevention is achieved.
The assembling process of the explosion-proof detector of the zirconia oxygen analyzer is as follows:
1) loading a cut-off valve assembly into an inner hole of an explosion-proof junction box main body according to the drawing shown in figure 4, inserting a reference air input pipe on the side surface of the overpressure cut-off valve into a corresponding mounting small hole of the junction box according to process requirements, then placing a sealing gasket, then loading an air filter, and screwing; in the process of screwing the air filter, the main body of the overpressure cut-off valve is required to be completely attached to the inner axial circle of the inner hole of the junction box, and the situation of deflection is avoided.
2) The inner hole of the junction box is provided with a positioning wallboard, wherein the positioning wallboard is provided with a large hole and a small hole, the large hole is sleeved into the excircle of the pressure cutting-off valve, the small hole is used for passing a wire or gas, 4 general small holes are arranged, and the positioning wallboard does not have a deflection phenomenon after being installed.
3) Connecting a piece detector assembly with a junction box assembly, wherein: standard air pipes, oxygen content signal line output ceramic protection pipes, thermocouple signal line output ceramic protection pipes and electric heater input power line ceramic protection pipes in the detector assembly are respectively inserted into corresponding position reserved holes in the positioning wall plate according to the process, and the insulating layers of the signal lines cannot be damaged in the operation. And after the detector assembly and the wiring assembly are connected in place, the sealing gasket is checked to be intact, then the bolt assembly is penetrated, and finally the bolt assembly is screwed down.
4) And checking that all output/input joints of the junction box are in perfect and sealed.
The following are pascal effect tests: the experimental conditions are that the detector is electrically heated without being electrified, and the temperature and the pressure are normal.
(1) Checking that the two site test parts shown in FIG. 5 are installed correctly, sealed at each joint;
(2) opening all pressure meter switches and gas transmission control valves in the detection test accessory shown in the attached figure 5, and observing that the pointers of two pressure meters are aligned to 0 position;
(3) gradually inputting compressed air into a gas input connector in the inlet direction of the gas transmission control valve for 10kP, 20kP and 30kP, observing that two pressure gauges synchronously display corresponding pressure values, when the input compressed air exceeds 30kP, displaying that the rising speed of the pressure gauge arranged on the explosion-proof junction box assembly is in a slow state, and finally stopping rising, but synchronously displaying the pressure value along with the rising compressed air by the pressure gauge arranged on the protection pipe part of the detector;
(4) and (3) judging: when the input compressed air exceeds the pressure value of 30kP set by the overpressure stop valve, the continuously input compressed air pushes the valve core piston to move backwards, and finally, the air gap is closed and cut off.
The following are the charpy effect tests: and (4) under the experimental condition that the compressed air is removed, the pressure of the compressed air in the detector is relieved, and the pressure returns to normal pressure. And B, electrifying and heating the electric heater in the detector protection tube, wherein the temperature of the heater reaches 700 ℃ after about 15-20 minutes, and entering constant temperature control.
(1) Experimental input of a small amount of combustible oxygen, white spirit or other combustible media into a gas input joint in the inlet direction of the gas transmission control valve, and immediate closing of the valve; the oxygen in the detector is combusted, and the pressure rise of the gas in the closed cavity is observed;
note: the one-way valve of the output port of the oxygen control valve is used for preventing the backflow of combustible gas and ensuring the safety of the combustible gas source for the test.
(2) Note that the two pressure gauges should synchronously (allow time difference) display the pressure value of the hot gas after the gas expands after combustion;
(3) if the two pressure gauges have pressure rise, the Charles' law effect is generated;
(4) a small amount of combustible oxygen, white spirit or other combustible media are continuously input in a test mode, the temperature of gas in the detector continues to rise, the pressure of hot gas in the closed cavity is synchronously increased, when the pressure of the hot gas exceeds the set pressure of the overpressure stop valve, a valve core piston of the detector moves backwards by overcoming the set pressure of the pre-tightening spring, and finally the air gap is closed.
(5) The experimental input of combustible oxygen, white spirit or other combustible media is a small amount of operation with the property of being immediately closed, so that the air in the closed space in the protective tube of the detector is excited to be combusted and then heated to form gas expansion, and the gas pressure in the closed cavity is increased.
In engineering application, the air filter (only shielding dust) shown in the attached figure 4 is in a normally open state, if substances containing flammable and explosive gases in the air continuously enter from an air filter, flow into the protective pipe along the air gap of the overpressure stop valve and rapidly diffuse into the inner cavity of the protective pipe, when the substances contact with a 700-DEG high-temperature incandescent electric heating pipe, the substances are immediately combusted, the temperature of the gas in the protective pipe rapidly rises, the pressure of the gas in the protective pipe also rapidly rises due to the effect of the Charles law, and finally, the valve core piston of the overpressure stop valve is pushed to push the element, the air gap in the stop valve achieves the technical purpose of isolating the explosion source in the valve from combustible gas outside the instrument.
(6) And (3) judging: the working condition of the site is simulated, the combustible oxygen is continuously input into the gas input joint in the inlet direction of the gas transmission control valve, because the source of the combustible gas in the protective pipe of the detector is continuously input, the combustible gas in the inner cavity of the protective pipe is quickly filled and immediately burnt, the gas in the narrow space in the protective pipe is quickly expanded, the pressure is quickly increased, and the valve core piston in the stop valve is quickly moved and closed.
The judgment basis is as follows:
in the first place, the pressure display value of the pressure gauge A in the attached figure 5 is unchanged, and the pressure display value of the pressure gauge B is far larger than the pressure display value of the pressure gauge A.
Secondly, the detector protection tube after the test is disassembled, so that the combustion traces in the protection tube can be seen: combustion smoke pollution, broken electric heating pipes, blown electric heating wires and the like.
Description of the drawings: the pre-tightening force of the spring is adjusted according to the maximum pressure limiting 30kP before the assembly of the invention, but the pre-tightening force cannot be determined to be the minimum gas expansion pressure after gas in a detector of a zirconia oxygen analyzer is combusted, and in practical application, the pre-tightening force of the 30kP spring can be properly adjusted after being determined according to the value B of a pressure gauge.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A shut-off valve comprises a valve main body (1) and is characterized in that,
a first hole (1-1), a second hole (1-2), a third hole (1-3) and a fourth hole (1-4) are sequentially arranged in the valve main body in the axial direction, the first hole, the second hole, the third hole and the fourth hole are connected into a whole, the diameter of the first hole is smaller than that of the second hole, the third hole is in a truncated cone shape, one end with the smaller diameter is connected with the second hole, and the minimum diameter of the third hole is larger than that of the first hole;
a reference air inlet (1-6) communicated with the second hole is arranged on the valve main body at a position corresponding to the second hole;
a piston (4) is arranged in the valve main body and comprises a piston head (4-1) and a rod body (4-2), the piston head is connected with the rod body, the shape of the piston head is matched with that of the third through hole, so that the piston can block the third through hole, the rod body penetrates through the fourth hole, the third hole and the second hole to be connected with the first hole in a sliding and sealing mode, a sliding block (2) is arranged in the first hole and located on one side, far away from the piston head, of the rod body, the sliding block is connected with the first hole in a sliding mode, a spring (3) is arranged between the sliding block and the rod body, an adjusting piece used for adjusting the sliding block to move back and forth is arranged at one end, close to the sliding block, of the valve main body, a blocking body (7) is connected with the other end of the valve main body, and a reference air outlet (7-1) communicated with the fourth through hole is arranged on the blocking body, and a limiting structure is arranged between the piston head and the blocking body, so that the piston head and the reference air outlet are spaced.
2. A shut-off valve according to claim 1, wherein the diameter of the second bore is smaller than the diameter of the fourth bore, the smallest diameter of the third bore being the same as the diameter of the second bore, and the largest diameter of the third bore being the same as the diameter of the fourth bore.
3. A shut-off valve according to claim 1, characterised in that the slide is sealingly connected to the first bore, and that the valve body is provided with a fifth bore (1-5) in communication with the first bore at a position corresponding to the spring.
4. A shut-off valve according to any of claims 1-3, characterised in that the piston head comprises a sealing portion (4-11) and a support portion (4-12), the sealing portion and the support portion being connected, the sealing portion being in the shape of a truncated cone, the smaller diameter end being connected to the stem;
the minimum diameter of the sealing part is the same as that of the rod body, the supporting part is cylindrical, and the maximum diameter of the sealing part is the same as that of the supporting part;
the diameter of the support portion is greater than the minimum diameter of the third bore and less than the maximum diameter of the third bore.
5. A shut-off valve according to claim 1, characterised in that the blocking body is a flange and the limiting structure is a limit pin (6) provided on the piston head.
6. A shut-off valve according to claim 1, characterised in that the reference air inlet is fitted with a hollow screw (5) on which an air filter (12) is fitted.
7. A shut-off valve according to claim 1, characterised in that the adjustment member comprises a nut (8) and a bolt (9), the bolt being in threaded connection with the nut;
one end of the valve main body, which is close to the sliding block, is provided with a threaded hole matched with the bolt, and the bolt penetrates through the threaded hole to abut against the sliding block.
8. A shut-off valve according to claim 7, characterised in that the bolt, the first through hole, the second through hole, the third through hole, the fourth through hole, the piston head, the stem and the reference air outlet are coaxially arranged.
9. A shut-off valve according to claim 1, characterised in that the valve body is provided with an internally threaded bore (1-7) communicating with the fourth bore, the internally threaded bore being arranged coaxially with the fourth bore, and the blocking body is provided with an external thread cooperating with the internally threaded bore.
10. An explosion-proof detector of a zirconia oxygen analyzer comprises an explosion-proof junction box (109), a detector protection tube (104) and a connector (116), wherein one end of the connector is connected with the explosion-proof junction box, the other end is connected with the detector protection tube,
the connecting head is provided with the shut-off valve of any one of claims 1 to 9, and a reference air outlet of the shut-off valve is communicated with the detector protection pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110716824.9A CN113464697B (en) | 2021-06-28 | 2021-06-28 | Shut-off valve and zirconia oxygen analyzer explosion-proof detector comprising same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110716824.9A CN113464697B (en) | 2021-06-28 | 2021-06-28 | Shut-off valve and zirconia oxygen analyzer explosion-proof detector comprising same |
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| CN113464697A true CN113464697A (en) | 2021-10-01 |
| CN113464697B CN113464697B (en) | 2024-06-25 |
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|---|---|---|---|---|
| JPH0734268U (en) * | 1993-11-30 | 1995-06-23 | 横浜エイロクイップ株式会社 | Shut-off valve |
| KR200220537Y1 (en) * | 2000-11-25 | 2001-04-16 | 이정수 | A low pressure breaking valve for gas tube |
| CN2833289Y (en) * | 2005-07-02 | 2006-11-01 | 吴正平 | Explosion-proof safety valve for pipeline |
| CN204253904U (en) * | 2014-07-25 | 2015-04-08 | 浙江春晖智能控制股份有限公司 | A kind of chemical oxygen demand analyser plane ceramic valve |
| CN105909838A (en) * | 2016-06-03 | 2016-08-31 | 安徽天康(集团)股份有限公司 | High-temperature, high-pressure and high-corrosion resistance over-pressure protector |
| CN215487870U (en) * | 2021-06-28 | 2022-01-11 | 安徽天康(集团)股份有限公司 | Cut-off valve and zirconia oxygen analyzer explosion-proof detector comprising same |
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2021
- 2021-06-28 CN CN202110716824.9A patent/CN113464697B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0734268U (en) * | 1993-11-30 | 1995-06-23 | 横浜エイロクイップ株式会社 | Shut-off valve |
| KR200220537Y1 (en) * | 2000-11-25 | 2001-04-16 | 이정수 | A low pressure breaking valve for gas tube |
| CN2833289Y (en) * | 2005-07-02 | 2006-11-01 | 吴正平 | Explosion-proof safety valve for pipeline |
| CN204253904U (en) * | 2014-07-25 | 2015-04-08 | 浙江春晖智能控制股份有限公司 | A kind of chemical oxygen demand analyser plane ceramic valve |
| CN105909838A (en) * | 2016-06-03 | 2016-08-31 | 安徽天康(集团)股份有限公司 | High-temperature, high-pressure and high-corrosion resistance over-pressure protector |
| CN215487870U (en) * | 2021-06-28 | 2022-01-11 | 安徽天康(集团)股份有限公司 | Cut-off valve and zirconia oxygen analyzer explosion-proof detector comprising same |
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| CN113464697B (en) | 2024-06-25 |
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