CN114576401A - Mechanical delay valve for fire-fighting system and operation method thereof - Google Patents
Mechanical delay valve for fire-fighting system and operation method thereof Download PDFInfo
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- CN114576401A CN114576401A CN202210263332.3A CN202210263332A CN114576401A CN 114576401 A CN114576401 A CN 114576401A CN 202210263332 A CN202210263332 A CN 202210263332A CN 114576401 A CN114576401 A CN 114576401A
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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
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/048—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded combined with other safety valves, or with pressure control devices
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
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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
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/168—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side combined with manually-controlled valves, e.g. a valve combined with a safety 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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1225—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston with a plurality of pistons
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Safety Valves (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
The invention relates to a mechanical time delay valve for a fire fighting system and an operation method thereof, wherein the mechanical time delay valve comprises a valve body, an oil supply cavity, a storage cavity, an air inlet flow channel and an air exhaust flow channel are arranged in the valve body, a front pressure regulating member and a rear pressure regulating member which can move in a reciprocating manner are respectively arranged in the oil supply cavity and the storage cavity, the oil supply cavity is sealed by the front pressure regulating member, the storage cavity is divided into an oil storage cavity and an air storage cavity which are not communicated by the rear pressure regulating member, hydraulic oil is filled between the closed end of the oil supply cavity and the front pressure regulating member, the oil supply cavity is communicated with the oil storage cavity, the air inlet flow channel and the air exhaust flow channel are simultaneously communicated with the air storage cavity, the hydraulic oil can be guided into the oil storage cavity by the front pressure regulating member when the front pressure regulating member moves, and air storage and exhaust can be carried out by the rear pressure regulating member when the rear pressure regulating member moves. The time delay valve of the technical scheme has the advantages that the pressure relief structure can be repeated, the pressure relief structure does not need to be repeatedly replaced, and the use cost can be obviously reduced.
Description
Technical Field
The invention relates to the technical field of fire fighting equipment, in particular to a mechanical time delay valve for a fire fighting system and an operation method thereof.
Background
Based on the physical properties that carbon dioxide does not burn, does not support combustion, is convenient to manufacture and is easy to liquefy, and is convenient to pot and store, the carbon dioxide is widely applied to a fire extinguishing system as a fire extinguishing agent, when fire is extinguished, the carbon dioxide is sprayed to a fire source through fire extinguishing equipment, and the carbon dioxide is higher than air in density, so that the carbon dioxide can cover the fire source to achieve the purpose of isolating air, further combustion of a fire-striking object is prevented, and the fire-striking object cannot be remained on the spot or on the spot after the fire source is extinguished, so that the damage to the fire-striking object is minimized.
At the fire site, however, the combustion of the fire-initiating object consumes oxygen, raising the concentration of carbon dioxide in the air, meanwhile, with the continuous ejection of carbon dioxide by the fire extinguishing equipment, the concentration of carbon dioxide in the air is sharply improved, in the environment of high-concentration carbon dioxide, the human body can have the symptoms of cerebral anoxia and even cause the sudden death of reflex respiratory arrest, therefore, it is necessary to strictly control the starting time of the carbon dioxide injection of the fire extinguishing apparatus, so that people have sufficient time to evacuate to a safe area, delay valves for fire extinguishing equipment are currently on the market, comprising an electromagnetic valve and a mechanical valve, the electromagnetic valve, in case of fire, the power supply cable can be blown by the influence of fire, so that the power system can not normally supply power to the electromagnetic valve, the valve body is easy to lose effectiveness, and the mechanical delay valve can well solve the problem that the electromagnetic valve is easy to lose effectiveness when a fire disaster happens.
As shown in chinese patent publication No. CN210644955U entitled "mechanical delayer for gas fire extinguishing system", when a fire occurs in the delayer, the fire extinguishing system is started, the high-pressure gas of the driving gas cylinder group is released and enters the delay gas inlet orifice and the gas inlet joint through the corresponding pipes, the high-pressure gas entering the delay gas inlet orifice gradually accumulates in the delay cavity of the delay valve body, after a certain time of accumulation (which can be designed to be twenty to thirty seconds, and other time intervals are designed according to actual needs), the high-pressure gas explodes the explosion diaphragm, the high-pressure gas enters the lower part of the piston accommodating cavity of the pneumatic control valve body, the high-pressure gas pushes the piston to move to puncture the diaphragm, so that the gas inlet joint is communicated with the channel cavity of the pneumatic control valve body, and the high-pressure gas enters the driving gas outlet from the channel cavity, thereby get into fire extinguishing agent bottle group to open fire extinguishing agent bottle group, nevertheless use the blasting diaphragm as pressure relief device in the delay timer of above-mentioned structure, and blasting piece device itself is unable repeated closed pressure relief device, so all need change the blasting diaphragm after every time the fire disaster, and inside the delay timer was located to the blasting diaphragm, so greatly complicated the change flow, lead to changing inefficiency, increased the use cost of this delay timer simultaneously.
Disclosure of Invention
In order to solve the above problems that the conventional mechanical time delay valve uses the blasting diaphragm as a pressure relief device, the blasting diaphragm needs to be replaced after each fire hazard, the replacing process of the blasting diaphragm is complex, the replacing efficiency is low, and the using cost of the time delay device is increased, the invention aims to provide the mechanical time delay valve with a repeatable pressure relief structure, so that the pressure relief structure does not need to be replaced repeatedly, and the using cost is obviously reduced, and the operating method thereof.
In order to achieve the purpose, the technical solution of the invention is as follows:
the utility model provides a machinery time delay valve for fire extinguishing system, which comprises a valve body, set up in the valve body and supply the oil chamber, the storage chamber, air inlet duct and exhaust runner, but be equipped with reciprocating motion's front portion pressure regulating component and rear portion pressure regulating component in supplying the oil chamber and the storage chamber respectively, the oil chamber is sealed to supplying between the front portion pressure regulating, rear portion pressure regulating component will store the chamber and separate for the oil storage chamber and the gas storage chamber that are not linked together, it has hydraulic oil to fill between the blind end and the front portion pressure regulating component in confession oil chamber, and supply oil chamber and oil storage chamber intercommunication, air inlet duct and exhaust runner communicate with the gas storage chamber simultaneously, front portion pressure regulating component can be with the leading-in to oil storage chamber of hydraulic oil when removing, rear portion pressure regulating component can carry out gas storage and exhaust when removing.
Preferably, a front cover and a rear cover are respectively arranged on two sides of the valve body, a front ventilating space and a rear ventilating space are respectively formed between the front cover and the valve body, and a front connecting hole and a rear connecting hole are respectively formed in the front cover and the rear cover.
Preferably, a needle valve is arranged between the oil supply chamber and the oil storage chamber, and the needle valve is in clearance fit with the circumferential valve body part.
Preferably, the valve body is further provided with an auxiliary flow passage, and the auxiliary flow passage is provided with a manual valve.
Preferably, the front and rear pressure regulating mechanisms comprise front and rear pistons, respectively, which are movable in the oil supply chamber and the storage chamber, respectively.
Preferably, the rear pressure regulating mechanism further includes a plug cap, a guide post and a spring, the plug cap is buckled in the storage cavity, the plug cap is provided with a guide hole, the guide post is slidably connected in the guide hole, the spring is sleeved on the guide post, the rear piston is arranged on the guide post, two ends of the spring are respectively abutted against the plug cap and the rear piston, the side wall of the rear piston is provided with an annular groove, and the air inlet channel and the air exhaust channel are staggered with the communication position of the air storage cavity.
Preferably, the front piston has a larger vertical projection than the rear piston.
Preferably, the front piston and the rear piston are respectively sleeved with a front sealing ring and a rear sealing ring.
Preferably, the storage chamber includes a large inner diameter section and a small inner diameter section, and the outer diameter of the rear piston portion on the side of the annular groove matches the inner diameter of the large inner diameter section.
A method of operating a mechanical time delay valve for a fire protection system, comprising:
connecting an air inlet pipeline and an exhaust pipeline to a front connecting hole and a rear connecting hole on the front cover and the rear cover respectively, and supplying carbon dioxide gas for fire extinguishing to the air inlet pipeline and the valve body through an external gas source;
the carbon dioxide gas reaches the front ventilation space, part of the carbon dioxide gas enters the gas inlet flow channel, enters the rear piston annular groove in the gas storage cavity, pushes the rear piston to move towards the oil storage cavity and seals the exhaust flow channel, the other part of the carbon dioxide gas acts on the front piston to push the front piston to move, and the front piston moves to press the hydraulic oil in the oil supply cavity into the oil storage cavity until the oil storage cavity is filled with the hydraulic oil;
after the oil storage cavity is filled, the pressure acting on the front piston is transmitted to the rear piston through hydraulic oil, when the acting force generated by the hydraulic oil on the rear piston is larger than the acting force generated by carbon dioxide gas on one side of the gas storage cavity, the rear piston moves back until the closed state of the gas exhaust channel is released, and the carbon dioxide gas in the gas storage cavity can continuously pass through the gas exhaust channel;
the carbon dioxide gas entering the exhaust flow channel enters the exhaust pipeline from a rear connecting hole on the rear cover and is sprayed outwards after passing through a rear ventilating space between the rear cover and the valve body;
when gas is stored, the needle valve is controlled to move to change the size of a gap between the needle valve and the valve body, and the flow rate of the hydraulic oil entering the oil storage cavity from the oil supply cavity is changed, so that the gas storage time is maintained for at least 30 s;
when the gap between the needle valve and the valve body is blocked, the manual valve on the auxiliary flow passage is opened, so that the carbon dioxide in the front ventilation space is directly discharged to the rear ventilation space through the auxiliary flow passage and is discharged to the exhaust pipeline through the rear connecting hole on the rear cover to be sprayed outwards.
Compared with the prior art, the invention has the advantages that:
the invention uses the time interval of injecting hydraulic oil into the oil storage cavity by the front pressure regulating component and the time interval of pushing the rear pressure regulating mechanism to move back by the hydraulic oil to enable the exhaust runner and the gas storage cavity to be released from the closed state as the time for delaying the outward injection of the carbon dioxide gas, thereby enabling people to have sufficient time to evacuate to a safe area in the time interval, avoiding the situation of cerebral anoxia of evacuated personnel due to the overhigh concentration of the carbon dioxide in a fire scene, simultaneously, the position of the front pressure regulating component is changed, the hydraulic oil quantity in the oil supply cavity and the oil storage cavity can be randomly changed, and the position of the rear pressure regulating component is correspondingly changed during the change, thereby realizing the change of the volume of the gas storage cavity, realizing the gas storage and the exhaust actions for many times, further, the pressure relief structure of the time delay valve of the invention does not need to be repeatedly replaced during the use, and can carry out repeated exhaust and pressure relief for many times, the use cost of the whole fire fighting system is obviously reduced.
Drawings
FIG. 1 is a schematic view of the delay valve of the present invention installed in a fire protection system;
FIG. 2 is a schematic structural view of a delay valve body of the present invention taken along a section of the oil supply chamber, the reservoir chamber and the exhaust gas flow passage;
FIG. 3 is a schematic structural view of a valve body of the time delay valve of the present invention taken along a section of an inlet flow passage and an auxiliary flow passage;
FIG. 4 is a schematic diagram of the overall configuration of the rear pressure regulating mechanism of the delay valve of the present invention;
FIG. 5 is a schematic structural view of a cross section taken along the storage chamber and the air inlet flow passage when the time delay valve of the present invention stores air;
FIG. 6 is an enlarged view of portion A of FIG. 5 according to the present invention;
FIG. 7 is a schematic structural view of a cross section taken along an oil supply chamber, a storage chamber and an exhaust flow passage when the delay valve stores gas according to the present invention;
FIG. 8 is an enlarged view of the portion B of FIG. 7 according to the present invention;
FIG. 9 is a schematic view of the delay valve of the present invention in cross-section taken through the storage chamber and the inlet flow passage when venting;
FIG. 10 is an enlarged view of section C of FIG. 9 according to the present invention;
FIG. 11 is a schematic structural view showing a cross section taken along an oil supply chamber, a storage chamber and an exhaust flow passage when the delay valve of the present invention exhausts;
FIG. 12 is an enlarged view of section D of FIG. 11 in accordance with the present invention;
fig. 13 is a schematic view showing the positional relationship between the oil supply chamber, the oil storage chamber, the needle valve and the valve body of the time delay valve according to the present invention.
As shown in the figure:
1. a valve body; 101. an oil supply chamber; 102. a storage chamber; 102a, an oil storage cavity; 102b, a gas storage cavity; 103. an air inlet channel; 104. an exhaust flow passage; 105. an auxiliary flow passage; 2. a front cover; 201. a front connection hole; 3. a rear cover; 301. a rear connection hole; 4. a front air-permeable space; 5. a rear breathable space; 6. a needle valve; 7. a manual valve; 8. a front piston; 9. a rear piston; 901. an annular groove; 10. a plug cover; 1001. a guide hole; 11. a guide post; 12. a spring; 13. a front seal ring; 14. a rear seal ring; 15. an air intake line; 16. an exhaust line.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually arranged in when used, and are used for the convenience of description only, and do not indicate or imply that the orientations are required to have specific orientations and specific orientations, configurations and operations, and thus, the present invention is not to be construed as being limited.
As shown in fig. 1, a mechanical delay valve for a fire fighting system comprises a valve body 1 having a conventional valve structure, an oil supply chamber 101, a storage chamber 102, an intake flow passage 103 and an exhaust flow passage 104 formed in the valve body 1, wherein the oil supply chamber 101, the intake runner 103 and the exhaust runner 104 are all communicated with the outer wall of the valve body 1, when the delay valve of the invention is installed in a fire-fighting system for actual use, the air inlet flow passage 103 and the air exhaust flow passage 104 are respectively communicated with an air supply pipe group and an air exhaust pipe group, the air supply pipe group is simultaneously connected with an external air source, the external air source is a container such as an air bottle or an air tank storing carbon dioxide, the air exhaust pipe group is connected with a nozzle, the stored carbon dioxide gas is input into the air inlet flow passage 103 by the external air source through the air supply pipe group, after the time delay of the valve body 1, the carbon dioxide gas is discharged to an exhaust pipe group outside the generator through an exhaust flow passage 104, and finally the carbon dioxide gas is sprayed to a fire source through a nozzle through the exhaust pipe group for fire extinguishing;
as shown in fig. 2 and 3, the oil supply chamber 101 and the storage chamber 102 are respectively provided with a front pressure regulating member and a rear pressure regulating member, the front pressure regulating member and the rear pressure regulating member can respectively reciprocate in the oil supply chamber 101 and the storage chamber 102, the front pressure regulating member seals the oil supply chamber 101, the storage chamber 102 is divided into a gas storage chamber 102b and a oil storage chamber 102a by the rear pressure regulating member, and under the action of the rear pressure regulating member, the oil storage chamber 102a and the gas storage chamber 102b are isolated from each other and are not communicated with each other, thereby forming two relatively independent chambers;
the oil supply cavity 101 is filled with hydraulic oil, specifically, the hydraulic oil is filled in a closed space between the closed end of the oil storage cavity 102a and the front pressure regulating member, the oil supply cavity 101 is communicated with the oil storage cavity 102a, so that the hydraulic oil can flow back between the oil supply cavity 101 and the oil storage cavity 102a, and the other ends of the air inlet flow passage 103 and the air exhaust flow passage 104 are simultaneously communicated with the air storage cavity 102b, in the invention, after carbon dioxide gas is introduced into the air storage cavity 102b through the air inlet flow passage 103, the rear pressure regulating member can be subjected to the pressure of the carbon dioxide gas, according to a fluid pressure formula, the rear pressure regulating member can be subjected to acting force generated by the gas at the moment to push the rear pressure regulating member to move in the storage cavity 102, so that the volumes of the air storage cavity 102b and the oil storage cavity 102a are changed, the air exhaust flow passage 104 can be closed during moving, so that air storage is realized, and at the volume between the front pressure regulating member and the closed end of the oil supply cavity 101 is reduced if the front pressure regulating member is controlled to move, according to the invention, carbon dioxide gas acts on the front piston 8 to enable the front piston to move under the action force generated by gas pressure, hydraulic oil can be guided into the oil storage cavity 102a along with the front pressure regulating member, the oil storage cavity 102a is filled gradually, when the oil storage cavity 102a is filled with the hydraulic oil, the front pressure regulating member still receives the pressure of the carbon dioxide gas, the pressure can be transmitted to the rear pressure regulating member through the hydraulic oil, the rear pressure regulating member receives the action force generated by the hydraulic oil, when the action force of the rear pressure regulating member on one side of the oil storage cavity 102a is greater than that of the air storage cavity 102b, the rear pressure regulating member can be pushed to move back, at the moment, the air storage cavity 102b is compressed through the rear pressure regulating member, the carbon dioxide gas stored in the air storage cavity 102b is discharged, the pressure relief is realized, the exhaust and the fire extinguishment are realized, the time interval that the hydraulic oil is injected into the oil storage cavity 102a through the front pressure regulating member, and the hydraulic oil is pushed by the hydraulic oil The time interval when the partial pressure regulating mechanism moves back to release the exhaust passage 104 and the gas reserving chamber 102b from the closed state is set as the time for delaying the carbon dioxide gas injection to the outside, therefore, in the time interval, people can evacuate to a safe area in sufficient time, the situation that the brain of the evacuated people is lack of oxygen due to overhigh concentration of carbon dioxide in a fire scene is avoided, at the same time, the position of the front pressure regulating member is changed, so that the amount of hydraulic oil in the oil supply chamber 101 and the oil reservoir chamber 102a can be arbitrarily changed, when the pressure changes, the position of the rear pressure regulating member changes correspondingly, so that the change of the volume of the air storage cavity 102b can be realized, the air storage and the air exhaust actions can be realized for a plurality of times, furthermore, when the pressure relief structure of the time delay valve is used, repeated air exhaust and pressure relief can be performed for many times without repeated replacement, so that the use cost of the whole fire fighting system is obviously reduced.
As shown in fig. 1, 5, 7, 9 and 11, a front cover 2 and a rear cover 3 are respectively arranged at two sides of a valve body 1, the front cover 2 and the rear cover 3 are fixed with the valve body 1, a front ventilating space 4 and a rear ventilating space 5 are respectively formed between the front cover 2 and the rear cover 3 and the valve body 1, a front connecting hole 201 and a rear connecting hole 301 are respectively formed on the front cover 2 and the rear cover 3, the front connecting hole 201 and the rear connecting hole 301 are respectively communicated with the front ventilating space 4 and the rear ventilating space 5, when being installed, an air inlet pipeline 15 is connected with the front connecting hole 201 on the front cover 2, carbon dioxide is supplied to the air inlet pipeline 15 by an external air source, passes through the front connecting hole 201 on the front cover 2 to enter the front ventilating space 4, and then can directly enter an air inlet pipeline 103 and simultaneously act on a front piston 8, and carbon dioxide discharged through an exhaust channel 104 can pass through the rear ventilating space 5, enters the exhaust pipeline 16 through the rear connecting hole 301 on the rear cover 3 and is discharged outwards to extinguish fire.
As shown in fig. 1, 5, 7, 9, 11 and 13, a needle valve 6 is arranged between an oil supply chamber 101 and an oil storage chamber 102a, the needle valve 6 is in clearance fit with part of a valve body 1 in the circumferential direction of the needle valve, when fire is extinguished, the delay valve of the invention can well adjust the delay injection time of carbon dioxide gas, and the flow rate of hydraulic oil entering the oil storage chamber 102a can be changed by only controlling the needle valve 6 to move on a connecting position with the valve body 1 to change the size of a gap between the needle valve 6 and the valve body 1, so that the time for filling the oil storage chamber 102a is changed, and the gas storage time, namely the delay injection time of carbon dioxide gas, is correspondingly changed, and in the invention, the gas storage time can be maintained for at least 30 s; .
As shown in fig. 3, 7, 9 and 11, the valve body 1 is further provided with an auxiliary flow passage 105, and both ends of the auxiliary flow passage 105 are communicated with the outer wall of the valve body 1, in the present invention, both ends of the auxiliary flow passage 105 are respectively communicated with the front ventilating space 4 and the rear ventilating space 5, so that when the gap between the needle valve 6 and the valve body 1 is blocked by particles in the hydraulic oil, so that the hydraulic oil cannot be injected into the oil storage chamber 102a, and therefore the carbon dioxide in the gas storage chamber 102b is difficult to be discharged, the carbon dioxide can be directly conveyed into the rear ventilating space 5 through the auxiliary flow passage 105 and discharged into the exhaust pipe 16 through the rear connecting hole 301 on the rear cover 3, so that the basic fire extinguishing effect can still be achieved, in addition, the manual valve 7 is provided on the auxiliary flow passage 105, the manual valve 7 can control the opening and closing of the auxiliary flow passage 105, when the hydraulic oil can normally flow from the oil supply chamber 101 to the oil storage chamber 102a, the manual valve 7 is closed, and when the manual valve 7 is blocked, the manual valve 7 is opened.
As shown in fig. 4 to 12, the front pressure regulating mechanism and the rear pressure regulating mechanism respectively include a front piston 8 and a rear piston 9, the front piston 8 and the rear piston 9 are respectively movable in the oil supply chamber 101 and the storage chamber 102, and the delay valve of the present invention operates to pressurize hydraulic oil to the oil storage chamber 102a by the movement of the front piston 8 and to perform air storage and air exhaust by the movement of the rear piston 9.
As shown in fig. 4 to 12, the rear pressure regulating mechanism further includes a plug 10, a guide post 11 and a spring 12, the plug 10 is buckled on an end of the storage chamber 102 to seal the storage chamber 102 and prevent carbon dioxide gas from leaking out, a guide hole 1001 is formed on one side of the plug 10 close to the storage chamber 102, a center line of the guide hole 1001 is parallel to a center of the storage chamber 102, the guide post 11 is slidably connected in the guide hole 1001, the spring 12 is sleeved on the guide post 11, the guide post 11 enables the spring 12 to stretch and contract in a linear direction, the rear piston 9 is disposed on the guide post 11, two ends of the spring 12 are respectively abutted against the plug 10 and the rear piston 9 to provide support for the rear piston 9 and limit free movement thereof, when the rear piston 9 slides, the guide post 11 is driven to move along the guide hole 1001 and presses the spring 12 or stretches the spring 12, an annular groove 901 is formed on a side wall of the rear piston 9, the communication positions of the air inlet flow passage 103 and the air outlet flow passage 104 with the air storage cavity 102b are staggered, the air inlet flow passage 103 is closer to the oil storage cavity 102a than the air outlet flow passage 104, when the rear piston 9 is not subjected to the pressure of carbon dioxide gas at the air storage cavity 102b and the pressure of hydraulic oil at the oil storage cavity 102a, the spring 12 is in a normal stretching state, at the moment, the outer wall part at one side of the annular groove 901 of the rear piston 9 seals the air outlet flow passage 104, the air inlet flow passage 103 is in an opening state, when the carbon dioxide gas enters the air storage cavity 102b through the air inlet flow passage 103, along with the increase of the gas pressure in the air storage cavity 102b, the acting force generated by the carbon dioxide gas received by the rear piston 9 is increased, the rear piston 9 can be pushed to drive the guide post 11 to move to one side of the oil storage cavity 102a along the guide hole 1001, at the moment, the spring 12 is stretched, when the acting force received by the oil storage cavity 102a side of the rear piston 9 is larger than the acting force at the air storage cavity 102b side, the guide post 11 can be driven to move along the guide hole 1001 to the side away from the oil storage chamber 102a, and at this time, the spring 12 is gradually compressed and moves along with the compression, and when the annular groove 901 reaches the butt joint position of the exhaust flow passage 104, the carbon dioxide gas in the gas storage chamber 102b can be smoothly discharged outwards through the exhaust flow passage 104.
Further, the vertical projection surface of the front piston 8 is larger than the vertical projection surface of the rear piston 9, in the present invention, a closed space is formed between the inner wall of the oil supply chamber 101 of the valve body 1, the inner wall of the oil storage chamber 102a, the front piston 8 and the rear piston 9, the hydraulic oil is pressed into the oil storage chamber 102a and filled with the hydraulic oil by the movement of the front piston 8, at this time, the pressure of the carbon dioxide gas still acts on the front piston 8, and the pressure loaded on the closed liquid can be transmitted to the rear piston 9 in various directions with the same magnitude according to the pascal's law, so that the pressure is transmitted to the rear piston 9 through the hydraulic oil with the same magnitude, according to the fluid pressure formula, the ratio of the acting force of the hydraulic oil on the rear piston 9 to the acting force exerted on the front piston 8 is equal to the ratio of the vertical projection surface area of the rear piston 9 to the vertical projection surface area of the front piston 8, that is the ratio of the acting surface areas of the front piston 8 and the rear piston 9, therefore, the acting force generated by the hydraulic oil received by the rear piston 9 is greater than the acting force received by the front piston 8, so that the rear piston 9 can move along the guide post 11 to the side far away from the oil storage chamber 102a until the closed state of the exhaust flow passage 104 is released.
As shown in fig. 4, 5, 7, 9 and 11, the front piston 8 and the rear piston 9 are respectively sleeved with a front sealing ring 13 and a rear sealing ring 14, so that the leakage of hydraulic oil and the leakage of carbon dioxide gas into the annular groove 901 can be avoided based on the above arrangement, and the normal use of the delay valve of the present invention is not affected.
As shown in fig. 5, 7, 9 and 11, the storage chamber 102 includes a large inner diameter section and a small inner diameter section, so that a step surface is formed at a transition position of the large inner diameter section and the small inner diameter section, and the outer diameter of the rear piston 9 portion on the side of the annular groove 901 matches the inner diameter of the large inner diameter section, based on the above arrangement, the maximum movement formation of the rear piston 9 can be limited, that is, when the rear piston 9 abuts against the step surface at the transition position of the large inner diameter section and the small inner diameter section of the storage chamber 102, the movement of the rear piston is stopped, and the problem that the outer wall of the rear piston 9 closes the communication position of the oil supply chamber 101 and the oil storage chamber 102a due to the excessive movement thereof is avoided, so that the hydraulic oil cannot be normally injected into the oil storage chamber 102 a.
With reference to fig. 1 to 13, the operation method of the delay valve of the present invention is:
firstly, connecting an air inlet pipeline 15 and an exhaust pipeline 16 to a front connecting hole 201 and a rear connecting hole 301 on a front cover 2 and a rear cover 3 respectively, and supplying carbon dioxide gas for fire extinguishing to the air inlet pipeline 15 and a valve body 1 through an external air source;
the carbon dioxide gas reaches the front ventilation space 4, part of the carbon dioxide gas enters the gas inlet flow channel 103, enters the annular groove 901 of the rear piston 9 in the gas storage cavity 102b, pushes the rear piston 9 to move towards the oil storage cavity 102a and seals the exhaust flow channel 104, the other part of the carbon dioxide gas acts on the front piston 8 to push the front piston 8 to move, and the front piston 8 moves to press the hydraulic oil in the oil supply cavity 101 into the oil storage cavity 102a until the oil storage cavity 102a is filled with the hydraulic oil;
after the oil storage cavity 102a is filled, the pressure acting on the front piston 8 is transmitted to the rear piston 9 through hydraulic oil, when the acting force generated by the hydraulic oil on the rear piston 9 is larger than the acting force generated by the carbon dioxide gas on one side of the gas storage cavity 102b, the rear piston 9 moves back until the closed state of the exhaust flow channel 104 is released, and the carbon dioxide gas in the gas storage cavity 102b can continuously pass through the exhaust flow channel 104;
finally, the carbon dioxide gas entering the exhaust flow passage 104 enters the exhaust pipeline 16 from the rear connecting hole 301 on the rear cover 3 and is sprayed outwards after passing through the rear ventilating space 5 between the rear cover 3 and the valve body 1;
when gas is stored, the needle valve 6 is controlled to move to change the size of a gap between the needle valve 6 and the valve body 1, and the flow rate of hydraulic oil entering the oil storage cavity 102a from the oil supply cavity 101 is changed, so that the gas storage time is maintained for at least 30 s;
when the gap between the needle valve 6 and the valve body 1 is blocked, the manual valve 7 on the auxiliary flow passage 105 is opened, so that the carbon dioxide in the front gas-permeable space 4 is directly discharged to the rear gas-permeable space 5 through the auxiliary flow passage 105 and is discharged to the exhaust pipeline 16 through the rear connecting hole 301 on the rear cover 3 to be sprayed outwards.
The foregoing embodiments and description have been presented only to illustrate the principles and preferred embodiments of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (10)
1. The utility model provides a machinery time delay valve for fire extinguishing system, it includes valve body (1), its characterized in that, it supplies oil chamber (101), storage chamber (102), air inlet channel (103) and exhaust runner (104) to have seted up in valve body (1), but be equipped with reciprocating motion's anterior pressure regulating member and rear portion pressure regulating member in supplying oil chamber (101) and storage chamber (102) respectively, it seals to supply oil chamber (101) between the anterior pressure regulating, rear portion pressure regulating member will store chamber (102) and separate for storage chamber (102) and storage chamber (102a) and gas storage chamber (102b) that are not linked together, it has hydraulic oil to fill between the blind end and the anterior pressure regulating member of supplying oil chamber (101), just supply oil chamber (101) and storage chamber (102a) intercommunication, air inlet channel (103) and air outlet channel (104) simultaneously with gas storage chamber (102b) intercommunication, anterior pressure regulating member can lead to storage chamber (102a) with hydraulic oil when removing, the rear pressure regulating member is capable of storing and exhausting air when moved.
2. The mechanical delay valve for the fire fighting system according to claim 1, characterized in that a front cover (2) and a rear cover (3) are respectively disposed on two sides of the valve body (1), a front ventilation space (4) and a rear ventilation space (5) are respectively formed between the front cover (2) and the rear cover (3) and the valve body (1), and a front connection hole (201) and a rear connection hole (301) are respectively formed on the front cover (2) and the rear cover (3).
3. A mechanical delay valve for a fire fighting system according to claim 1, characterized in that a needle valve (6) is arranged between the oil supply chamber (101) and the oil reservoir chamber (102a), the needle valve (6) being partly clearance fitted to the valve body (1) in its circumferential direction.
4. A mechanical delay valve for a fire fighting system according to claim 1, characterized in that an auxiliary flow channel (105) is further opened in the valve body (1), and a manual valve (7) is provided on the auxiliary flow channel (105).
5. A mechanical time delay valve for a fire fighting system according to any of claims 1 to 4, characterized in that the front and rear pressure regulating mechanisms comprise a front piston (8) and a rear piston (9), respectively, the front piston (8) and the rear piston (9) being movable in the oil supply chamber (101) and the storage chamber (102), respectively.
6. The mechanical time delay valve for the fire fighting system according to claim 5, wherein the rear pressure regulating mechanism further comprises a plug cover (10), a guide post (11) and a spring (12), the plug cover (10) is buckled in the storage chamber (102), a guide hole (1001) is formed in the plug cover (10), the guide post (11) is slidably connected in the guide hole (1001), the spring (12) is sleeved on the guide post (11), the rear piston (9) is arranged on the guide post (11), two ends of the spring (12) are respectively abutted against the plug cover (10) and the rear piston (9), an annular groove (901) is formed in a side wall of the rear piston (9), and a communication position between the air inlet channel (103) and the air exhaust channel (104) and the air storage chamber (102b) is staggered.
7. A mechanical time delay valve for a fire fighting system according to claim 5, characterized in that the vertical projection of the front piston (8) is larger than the vertical projection of the rear piston (9).
8. A mechanical time delay valve for a fire fighting system according to claim 5, characterized in that the front piston (8) and the rear piston (9) are further sleeved with a front sealing ring (13) and a rear sealing ring (14), respectively.
9. A mechanical time delay valve for a fire fighting system according to claim 6, characterized in that the storage chamber (102) comprises a large inner diameter section and a small inner diameter section, and the outer diameter of the rear piston (9) portion on the side of the annular groove (901) matches the inner diameter of the large inner diameter section.
10. A method of operating a mechanical time delay valve for a fire protection system, comprising:
an air inlet pipeline (15) and an exhaust pipeline (16) are respectively connected to a front connecting hole (201) and a rear connecting hole (301) on a front cover (2) and a rear cover (3), and carbon dioxide gas for fire extinguishing is supplied to the air inlet pipeline (15) and the valve body (1) through an external air source;
the carbon dioxide gas reaches the front ventilation space (4), part of the carbon dioxide gas enters the air inlet flow channel (103), enters a circular groove (901) of a rear piston (9) in the gas storage cavity (102a), pushes the rear piston (9) to move towards the oil storage cavity (102a) and closes the exhaust flow channel (104), the other part of the carbon dioxide gas acts on the front piston (8) to push the front piston (8) to move, and the front piston (9) moves to press the hydraulic oil in the oil supply cavity (101) into the oil storage cavity (102a) until the oil storage cavity (102a) is filled with the hydraulic oil;
after the oil storage cavity (102a) is filled, the pressure acting on the front piston (8) is transmitted to the rear piston (9) through hydraulic oil, when the acting force generated by the hydraulic oil on the rear piston (9) is larger than the acting force generated by carbon dioxide gas on one side of the gas storage cavity (102b), the rear piston (9) moves back until the closed state of the gas exhaust flow passage (104) is released, and the carbon dioxide gas in the gas storage cavity (102a) can continuously pass through the gas exhaust flow passage (104);
the carbon dioxide gas entering the exhaust flow passage (104) enters the exhaust pipeline (16) from a rear connecting hole (301) on the rear cover (3) to be sprayed outwards after passing through a rear ventilating space (5) between the rear cover (3) and the valve body (1);
when gas is stored, the needle valve (6) is controlled to move to change the size of a gap between the needle valve and the valve body (1), and the flow rate of hydraulic oil entering the oil storage cavity (102a) from the oil supply cavity (101) is changed, so that the gas storage time is maintained for at least 30 s;
when a gap between the needle valve (6) and the valve body (1) is blocked, the manual valve (7) on the auxiliary flow passage (105) is opened, so that carbon dioxide in the front ventilation space (4) is directly discharged to the rear ventilation space (5) through the auxiliary flow passage (105) and is discharged to the exhaust pipeline 16 through a rear connecting hole (301) on the rear cover (3) to be sprayed outwards.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210263332.3A CN114576401B (en) | 2022-03-17 | 2022-03-17 | Mechanical delay valve for fire-fighting system and operation method thereof |
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| CN202210263332.3A CN114576401B (en) | 2022-03-17 | 2022-03-17 | Mechanical delay valve for fire-fighting system and operation method thereof |
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|---|---|
| CN114576401B (en) | 2023-08-25 |
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