CN115789523A - Gas transmission and distribution pipe network with remote cut-off function - Google Patents
Gas transmission and distribution pipe network with remote cut-off function Download PDFInfo
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- CN115789523A CN115789523A CN202310074333.8A CN202310074333A CN115789523A CN 115789523 A CN115789523 A CN 115789523A CN 202310074333 A CN202310074333 A CN 202310074333A CN 115789523 A CN115789523 A CN 115789523A
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Abstract
The invention discloses a gas transmission and distribution pipe network with a remote cut-off function, and relates to the technical field of valves and automatic control thereof. The gas transmission and distribution pipe network comprises at least one pressure regulating cut-off branch, wherein the pressure regulating cut-off branch comprises a cut-off valve and a pressure regulator which are sequentially connected in series on the branch, and the cut-off valve is connected with a cut-off execution component; the invention adds a pilot valve in the existing gas transmission and distribution pipe network, the pilot valve has novel structure design, and the control of the pilot valve can realize the cut-off after the overpressure of the system and the remote emergency cut-off in the control center; by applying the pilot valve, when two or more paths of pressure regulating equipment work, the cutting-off threshold value can be set as required, is not set according to the difference of outlet pressure any more, and is not cut off due to the fluctuation of the outlet pressure of a certain path; meanwhile, the requirements of different use working conditions can be met only by one configuration of the stop valve actuator and the adjusting spring.
Description
Technical Field
The invention relates to the technical field of valves and automatic control thereof, in particular to the technical field of cut-off control equipment of a gas transmission and distribution pipe network, and more particularly relates to a gas transmission and distribution pipe network with remote cut-off.
Background
The safety protection of present gas transmission and distribution pipe network adopts voltage regulator and trip valve to realize usually, generally establish ties trip valve and voltage regulator and use, and the trip valve is located the pipe network upper reaches, the voltage regulator is located the pipe network low reaches, with the supporting still including cutting off executive component of trip valve, with the supporting commander that still is including of voltage regulator, when overpressure appears for the reason in pressure behind the pressure regulating, the commander can be according to pressure before the pressure regulating and pressure regulating back pressure, the aperture is transferred to the control voltage regulator, thereby control transmission and distribution pipe network low reaches pressure, if pressure continues superelevation to the trip valve when setting for the threshold value afterwards, cut off executive component and can drive the trip valve and cut off the gas source rapidly, protection low reaches equipment and gas safety with using. The pilot unit is through connecting pipeline pressure before the pressure regulating and pipeline pressure after the pressure regulating, realize control and regulation to the aperture of regulator according to its pressure differential, cut off the executive component and realize the control of cutting off the valve according to pressure after the pressure regulating, wherein cut off and be provided with regulating spring in the executive component, thereby all set for pipeline pressure overpressure value after the pressure regulating through the elasticity value that sets up regulating spring at present, when the pipeline pressure value overcomes regulating spring elasticity after the pressure regulating, then cut off executive component control trip valve and cut off the source of coming gas, protect downstream equipment and gas safety.
The pressure regulating transmission and distribution branch in the existing gas transmission and distribution pipe network is usually set into two paths or multiple paths, when the two paths or the multiple paths are adopted for operation, the operating pressure of each branch is inconsistent, the set pressure of each branch is reduced step by step, but the cut-off pressure can be set according to step by step, especially when the multiple paths are adopted for operation, the pressure setting difference of each branch is large, and in operation, if the pressure of a certain branch fluctuates, the cut-off valves of each branch are easily cut off, and the installation mode is shown in attached figures 1 and 2.
In the gas transmission and distribution, because of the variety of gas use equipment, this leads to the appearance of multiple use operating mode, has just established the configuration of polytypic executor for satisfying each operating mode demand, including supporting adjusting spring.
Under the rapid development of emerging technologies such as big data, cloud computing, internet of things, mobile internet, artificial intelligence and the like, the construction of intelligent equipment of each gas company has stepped into a fast lane, which puts forward higher requirements on the safety and the intelligent degree of the equipment, such as: the intellectualization of the pressure regulator, the remote cutting of the cut-off valve and the like.
The existing gas transmission and distribution pipe network completely depends on the pipeline pressure to realize the regulation and the cut-off of the pipeline pressure, the remote cut-off control cannot be realized, the cut-off valve can generate dust accumulation and stagnation after being used for a long time, the action of a cut-off executing component cannot be successfully triggered when the pressure reaches a preset cut-off value after the pressure regulation of the transmission and distribution pipeline, the action of the cut-off executing component can be triggered when the pressure is higher than the preset cut-off value, the precision of the cut-off valve is influenced, and therefore safety accidents are caused.
Disclosure of Invention
The invention aims to solve the problems that the gas transmission and distribution pipe network in the prior art cannot realize remote control cutting and the gas source cannot be cut off in time when the pressure of a pipeline after pressure regulation reaches a set pressure value after dust accumulation of a cut-off valve is blocked. The gas transmission and distribution pipe network with remote cut-off not only can realize the cut-off after the overpressure of the system, but also can realize the remote emergency cut-off in a control center; the invention adds a pilot valve in the existing gas transmission and distribution pipe network, the pilot valve has novel structure design, and the control of the pilot valve can realize the cut-off after the overpressure of the system and the remote emergency cut-off in a control center; through the application of the pilot valve, when two or more paths of pressure regulating equipment work, the cutting-off threshold value can be set as one threshold value according to requirements, is not set according to the difference of outlet pressure any more, and is not cut off due to the fluctuation of the outlet pressure of a certain path; meanwhile, the requirements of different use working conditions can be met only by one configuration of the stop valve actuator and the adjusting spring. The most fundamental difference between the invention and the conventional cut-off control mode is as follows: the conventional cut-off control actuator directly collects the pressure after pressure regulation and matches a spring to control cut-off; the cut-off valve actuator only needs to be matched with a fixed small spring, and the cut-off of the cut-off valve is controlled by automatically controlling the on and off of the air flow entering the cut-off actuator through the pilot valve.
In order to solve the problems in the prior art, the invention is realized by the following technical scheme.
The invention discloses a gas transmission and distribution pipe network with remote cut-off, which at least comprises a pressure regulating cut-off branch, wherein the pressure regulating cut-off branch comprises a cut-off valve and a pressure regulator which are sequentially connected in series on the branch, and the cut-off valve is connected with a cut-off execution component; the pressure regulator is connected with a commander, the commander is connected with the pressure of a front pipeline of the pressure regulator and the pressure of a rear pipeline of the pressure regulator, and the commander pressure is generated according to the pressure of the front pipeline of the pressure regulator and the pressure of the rear pipeline of the pressure regulator and is connected with the pressure regulator and controls the opening of the pressure regulator; the pressure regulating cut-off branch circuit also comprises a pilot valve, the pilot valve comprises a left valve body and a right valve body, an air inlet cavity I, a valve seat I, a valve rod I, a diaphragm assembly I, a diaphragm cavity I and a compression spring I are arranged in the left valve body, the valve seat I is positioned in the air inlet cavity I, and an air inlet I is formed in the left valve body on one side of the air inlet cavity I; the diaphragm assembly I is positioned in the diaphragm cavity I, and divides the diaphragm cavity I into an upper diaphragm cavity I and a lower diaphragm cavity I; the compression spring I is positioned in the upper membrane cavity I, and the lower end of the compression spring I acts on the membrane component I; the valve rod I is a hollow valve rod, the valve rod I is fixedly connected with the diaphragm assembly I, the upper end of the valve rod I extends upwards to be connected with the air outlet, and the lower end of the valve rod I extends into the air inlet cavity I to be in sealing fit with the valve seat I;
the right valve body is internally provided with an air chamber, a diaphragm cavity II, a diaphragm assembly II, a valve rod II and a valve seat II, the diaphragm assembly II is positioned in the diaphragm cavity II and divides the diaphragm cavity II into an upper diaphragm cavity II and a lower diaphragm cavity II, the right valve body is provided with an air inlet II communicated with the upper diaphragm cavity II and an air inlet III communicated with the lower diaphragm cavity II, the upper end of the air chamber is fixedly provided with a valve port, the valve rod II is arranged in the valve port, the upper end of the valve rod II extends into the lower diaphragm cavity II to be in sealing fit with the diaphragm assembly II, the lower end of the valve rod II extends downwards to form a valve port to be fixedly connected with the valve seat II, the bottom of the valve port is in sealing fit with the upper end face of the valve seat II, and the bottom of the air chamber is provided with an air outlet penetrating through the right valve body; under the action of downward pressure on the valve rod II, the valve seat II moves downward along with the valve rod II, the upper end face of the valve seat II is unsealed with the bottom of a valve port, and the bottom of the valve seat II blocks an exhaust port; the upper end of the valve port is also provided with a compression spring II, the lower end of the compression spring II acts on a limiting platform in the valve port, and the upper end of the compression spring II acts on a limiting step of the valve rod II;
the upper end of the valve rod II is a semi-closed hollow cavity with an upward opening, the side wall of the hollow cavity is provided with a through hole communicated with the valve port, the side wall of the valve port is provided with a communicating hole communicated with the air chamber, and a connecting cavity is arranged between the air chamber of the right valve body and the lower film cavity I of the left valve body; a gas channel is arranged between the gas inlet II of the right valve body and the gas outlet of the left valve body, and an electromagnetic valve for controlling the on-off of the gas channel is arranged on the gas channel;
pipeline pressure behind the pressure regulator is connected to air inlet I, air inlet II links to each other with the commander, connects commander pressure, pipeline pressure behind the pressure regulator is connected to air inlet III, the gas outlet connection cuts off executive component.
The working principle of the invention is as follows:
when the gas transmission pipeline is in a normal working state, the commander is connected with the pressure of a front pipeline of the pressure regulator and the pressure of a rear pipeline of the pressure regulator to generate the pressure of the commander, then the pressure of the commander is connected with the pressure regulator and the pilot valve, a gas inlet II (from the pressure P0 of the commander) on a right valve body of the pilot valve is compared with a gas inlet III (from the pressure P2 of the rear pipeline of the pressure regulator), P0 is larger than P2, the difference value of the P0 and the P2 is a fixed value, the elastic force of a compression spring II is controlled to be equal to the fixed value, the resultant force of the P2 and the compression spring II is equal to P0, and the diaphragm assembly II is in a balanced state; the valve rod II is matched and sealed with the lower end of the diaphragm assembly II under the action of the compression spring II, gas of the gas inlet III (from the pressure-regulated pipeline pressure P2) cannot enter a hollow cavity of the valve rod II, and no gas exists in the connecting cavity. A valve rod I in the left valve body is matched and sealed with a valve seat I under the action of a compression spring I, and an air inlet I (from the pressure P2 of a pipeline after pressure regulation) cannot enter a hollow airflow channel of the valve rod I and an air outlet of the left valve body; the electromagnetic valve arranged in the gas channel is in a normally closed state, gas at the gas inlet II of the right valve body cannot enter the gas outlet of the left valve body through the gas channel, the execution component of the cut-off valve is in a gas-free state, and the cut-off valve is not cut off.
When the pipeline pressure P2 rises to a certain value after the pressure of the gas pipeline is regulated, the gas pressure P2 of the gas inlet III entering the lower membrane cavity II is larger than P0, the diaphragm assembly II moves towards the upper membrane cavity II, a gap is formed between the diaphragm assembly II and the upper end of the valve rod II, the gas in the gas inlet III enters the semi-closed hollow cavity of the valve rod II, the gas acts in the hollow cavity of the valve rod II to generate downward force, the elastic force of the compression spring II is overcome, the valve rod II moves downwards, the valve seat II fixedly connected with the valve rod II also moves downwards, the exhaust port at the bottom of the gas chamber is closed, the gas in the semi-closed hollow cavity of the valve rod II enters the connecting cavity through the through hole in the side wall of the hollow cavity and the communication hole of the valve port, then enters the lower membrane cavity I of the left valve body from the connecting cavity, the balance of the diaphragm assembly I is damaged, the generated upward acting force overcomes the elastic force of the compression spring I, the diaphragm assembly I moves towards the upper membrane cavity I, the sealing of the valve rod I is driven to move upwards, the sealing of the valve seat is opened, the gas source (from the gas pipeline pressure P2) after the pressure regulation, the gas pipeline, the gas flow of the gas pipeline is cut-gas pipeline, and the gas pipeline is cut off valve, and the gas pipeline.
When an air source at the front end of the gas transmission pipeline is cut off, the pipeline pressure P2 is reduced after pressure regulation, the pressure in a lower film cavity II of a right valve body is reduced, a film assembly II moves downwards, meanwhile, the pressure in the lower film cavity II acts on a valve rod II to generate a downward force which is reduced and is smaller than an upward force generated by the action of a compression spring II on the valve rod II, the valve rod II moves upwards under the action of the compression spring II, the lower end of the film assembly II is in contact sealing with the upper end of the valve rod II, an air flow channel from an air inlet III to the interior of a pilot valve is blocked, when the valve rod II moves upwards, the valve seat II fixedly connected with the valve rod II is driven to move upwards and simultaneously, an air outlet is opened, the air originally entering the lower film cavity I of the left valve body flows back to an air chamber of the pilot valve through a connecting cavity and is discharged through the air outlet at the bottom of the air chamber, the air pressure in the lower film cavity I of the left valve body is restored to the atmospheric pressure, the valve rod I moves downwards under the action of the compression spring I, the valve rod I and is matched with the valve seat I to seal, the air flow channel in the air inlet is cut off, and no air flow channel in the air outlet. The pilot valve automatically returns to the initial state.
If the front end cut-off valve is not cut off under the set pressure, the reason may be that accumulated dust in the cut-off valve is stuck, the cut-off valve execution component can act under higher pressure, when the rear end pressure continues to rise to the set pressure of remote control, the electromagnetic valve in the gas channel is automatically opened, the gas (gas P0 from the pressure of the commander) with higher pressure from the gas inlet II directly flows to the gas outlet through the gas channel at the electromagnetic valve, flows to the cut-off valve execution component from the gas outlet, the cut-off valve acts, and the gas source at the front end of the gas transmission line is cut off. Or when the gas transmission pipeline needs to be remotely and manually cut off in an emergency, the pilot valve electromagnetic valve button can be remotely opened in the control room, gas from the gas inlet II (gas P0 from the pressure of the pilot valve) directly flows to the gas outlet through the gas channel at the electromagnetic valve and flows to the stop valve execution component from the gas outlet, so that the action of the stop valve is ensured, and the safety accident is avoided.
In order to better implement the technical scheme of the invention, the method also comprises the following technical contents:
further preferably, the pilot valve further comprises a valve body III, the valve body III is located above the left valve body and the right valve body, a penetrating hole communicated with an air outlet in the left valve body is formed in the valve body III, and the air channel is located in the valve body III.
Further preferably, the left valve body comprises an upper valve body I and a lower valve body I, the valve seat I, the air inlet cavity I and the air inlet I are all located on the lower valve body I, the diaphragm cavity I is formed between the upper valve body I and the lower valve body I, the diaphragm assembly I is fixed between the upper valve body I and the lower valve body I, and openings for the valve rod I to move are formed in the upper valve body I and the lower valve body I; the upper end of the compression spring I acts on the upper end of the upper valve body I, and the lower end of the compression spring I acts on the upper end of the diaphragm assembly I.
Preferably, the diaphragm assembly I comprises a diaphragm I, an upper pressure plate I and a lower pressure plate I, and the diaphragm I is positioned between the upper pressure plate I and the lower pressure plate I; the lower end of the compression spring I acts on the upper pressure plate I.
Still further preferably, the valve rod I and the upper pressure plate I are fixed into a whole.
Preferably, the right valve body comprises an upper valve body II and a lower valve body II, the air chamber, the valve port, the valve rod II, the air inlet III, the connecting cavity and the valve seat II are all located in the lower valve body II, and the air inlet II is located on the upper valve body II; and the diaphragm assembly II is positioned between the upper valve body II and the lower valve body II.
And a guide sleeve is further arranged in the upper valve body II, the upper end of the diaphragm assembly II is connected with a valve rod III, the valve rod III upwards extends into the guide sleeve, and a guide cavity matched with the valve rod III is formed in the guide sleeve.
Diaphragm subassembly II includes diaphragm II, goes up gland II and gland II down, diaphragm II is located between gland II and the gland II down.
The lower end of the valve rod III is fixed on the upper gland II, and the top end of the valve rod II is in sealing fit with the bottom of the lower gland II.
The valve port is assembled at the upper end of the air chamber, the upper end of the valve port extends into the lower membrane cavity II, and the bottom of the valve port is conical and is in sealing fit with the upper end face of the valve seat II.
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
1. the gas transmission and distribution pipe network with remote cut-off of the invention realizes the opening and closing of the self pilot valve through the gas pressure difference in the gas transmission pipeline, and can also control the opening and closing of the pilot valve through the switch of the remote control electromagnetic valve. The pilot valve structure is highly integrated, the volume is small, and the two control modes are simple, convenient and reliable.
2. Compared with the prior art, the invention has the most direct technical effect that the structure of the original cutting execution part is simplified, the structure of the original execution part is different according to the difference of outlet pressure, for example, when the high-pressure outlet is carried out, a piston structure can be adopted due to the limitation of the pressed diaphragm, different outlet pressures are matched with different springs, the structure is complex, the configuration is complex, and the tracking and maintenance of products in the later period are difficult. After the pilot valve is additionally arranged, the stop valve actuators are unified into a structure and matched with a fixed small spring, and the stop valve is extremely convenient to produce and maintain at a later stage.
3. The conventional cut-off valve generally does not have remote cut-off control, if the conventional cut-off valve needs to have remote control, mechanisms such as signal sensing and execution cylinders need to be added on the cut-off valve, the structure is complex, and the operation is difficult. After the pilot valve is installed, the remote control electromagnetic valve is additionally arranged on the pilot valve, and the electromagnetic valve is remotely and directly controlled to be opened and closed to realize remote cut-off of the cut-off valve, so that the remote cut-off of the cut-off valve is quicker and more convenient, and the production cost is greatly reduced.
4. After the pilot valve is installed, the stability of the outlet pressure of the pressure regulating system is greatly improved. Particularly, in a two-way or multi-way pipeline pressure regulating system, when two-way or multi-way operation is adopted, the operating pressure of each branch is set to be inconsistent, in order to prevent mistaken cut-off caused by air pressure change of the parallel branch due to air flow kicking action caused by cut-off valve action, the set pressure of each branch is gradually reduced, but the cut-off pressure can be set according to gradual rise, particularly when the multi-way operation is carried out, the pressure setting difference of each branch is large, and in operation, if the pressure of a certain branch fluctuates, the cut-off valves of each branch are easily cut off simultaneously. After the pilot valve is installed, the outlet pressure of each branch can be set to be the same pressure value, and because the outlet pressure collected by the cutoff pilot valve of each branch is the same pressure, the operation of other branches cannot be influenced even if the outlet pressure of one branch is fluctuated and cut off. Therefore, the pressure regulating system can operate more stably after the pilot valve is installed.
5. The valve body III is arranged, so that the processing of a gas channel and the assembly of the electromagnetic valve are facilitated, the gas channel is arranged in the valve body III, the electromagnetic valve inside is protected from being disturbed by the outside, and the control precision is ensured.
6. The left valve body and the right valve body both comprise the upper valve body and the lower valve body, and due to the structural form, on one hand, the cavity structures such as the air chamber, the diaphragm cavity and the like are conveniently machined on the valve body, and meanwhile, the structural parts such as the valve seat, the valve rod, the compression spring and the like are also conveniently assembled, and the machining and assembling processes are simple.
Drawings
FIG. 1 is a flow chart of a conventional one-way installation shut-off control;
FIG. 2 is a flow chart of a conventional multiple installation shut-off control;
FIG. 3 is a flow chart of the cut-off control of a single branch for installing the gas transmission and distribution pipe network of the present invention in a single way;
FIG. 4 is a flow chart of the cut-off control of multiple double branches for installing the gas transmission and distribution pipe network of the present invention;
FIG. 5 is a cross-sectional view of a pilot valve construction of the present invention;
reference numerals: 1. a stop valve 2, a pressure regulator 3, a commander 4, a cut-off execution part 5, a pilot valve 6, a left valve body 7, a right valve body 8, an air inlet cavity I, 9, a valve seat I, 10, a valve rod I, 11, a diaphragm assembly I, 12, a diaphragm cavity I, 13, a compression spring I, 14, an air inlet I, 15, an upper diaphragm cavity I, 16, a lower diaphragm cavity I, 17, an air outlet, 18, an air chamber, 19, a diaphragm cavity II, 20, a diaphragm assembly II, 21, a valve rod II, 22, a valve seat II, 23, an upper diaphragm cavity II, 24, a lower diaphragm cavity II, 25, an air inlet II, 26 and an air inlet III, 27, valve port, 28, exhaust port, 29, compression spring II, 30, spacing platform, 31, spacing step, 32, hollow cavity, 33, through-hole, 34, intercommunicating pore, 35, connecting cavity, 36, gas channel, 37, solenoid valve, 38, valve body III, 39, upper valve body I, 40, lower valve body I, 41, diaphragm I, 42, upper pressure plate I, 43, lower pressure plate I, 44, upper valve body II, 45, lower valve body II, 46, guide sleeve, 47, valve rod III, 48, guide cavity, 49, diaphragm II, 50, upper pressure cover II, 51, lower pressure cover II, 52 and through hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
Referring to the attached figure 1 of the specification, in a conventional gas transmission and distribution pipeline, a stop valve 1 and a pressure regulator 2 are generally arranged to control the transmission pressure of the transmission and distribution pipeline, wherein the pressure regulator 2 is used for regulating the transmission and distribution pipeline pressure, and the stop valve 1 is positioned in front of the pressure regulator 2 and is used for stopping the transmission of gas when the pressure of the transmission and distribution pipeline is higher after the pressure is regulated. As shown in the accompanying drawings 1 and 2 of the specification, the operating principle of the voltage regulator 2 is as follows: the commander 3 is respectively connected with the pressure regulating front end pressure and the pressure regulating rear end pressure, and the opening of the pressure regulator 2 is controlled in the commander 3 according to the pressure difference between the pressure regulating front end pressure and the pressure regulating rear end pressure, so that the effect of regulating the conveying pressure is achieved; the cut-off valve 1 is connected with a cut-off executing component 4, the cut-off executing component 4 is driven by pressure of the pressure regulating rear end, when the pressure of the pressure regulating rear end is larger than a set pressure value, the cut-off executing component 4 acts, and the cut-off valve 1 cuts off the transmission of the transmission and distribution pipeline.
Referring to the attached figure 2 of the specification, the gas pressure regulating transmission and distribution pipeline is generally arranged into two paths or multiple paths, when two paths or multiple paths are adopted for operation, the operating pressure of each branch is inconsistent, the set pressure of each branch is reduced step by step, but the cut-off pressure can be set according to step by step, particularly when multiple paths are adopted for operation, the pressure setting difference of each branch is large, and in operation, if the pressure of a certain branch fluctuates, the cut-off valves 1 of each branch are easily cut off at the same time.
When dust accumulated in the stop valve 1 is stuck, the fluctuation of pressure after the pressure regulation of the transmission and distribution pipeline cannot trigger the action of the stop execution component 4, so that the condition of failure in stopping can be caused, and safety accidents are caused.
In order to solve the existing problems, the invention provides a pilot valve 5 gas transmission and distribution pipe network with remote cut-off, the invention adds a pilot valve 5 in the existing gas transmission and distribution pipe network, the structure design of the pilot valve 5 is novel, and the cut-off after the overpressure of the system and the remote emergency cut-off in a control center can be realized by controlling the pilot valve 5; by applying the pilot valve 5, when two or more paths of pressure regulating equipment work, the value of the cut-off valve 1 can be set as a threshold value according to requirements, is not set according to different outlet pressures any more, and is not cut off due to fluctuation of the outlet pressure of a certain path; meanwhile, the requirements of different use working conditions can be met only by one configuration of the actuator and the adjusting spring of the stop valve 1. The most fundamental difference between the invention and the conventional cut-off control mode is as follows: the conventional cut-off control actuator directly collects the pressure after pressure regulation and matches a spring to control cut-off; the actuator of the cut-off valve 1 of the invention only needs to be matched with a fixed small spring, and the cut-off of the cut-off valve 1 is controlled by automatically controlling the on and off of the air flow entering the cut-off actuator by the pilot valve 5.
As an embodiment of the invention, referring to the attached drawing 3 in the specification, the embodiment discloses a pilot valve 5 gas transmission and distribution pipe network with remote cut-off, the gas transmission and distribution pipe network at least comprises a pressure-regulating cut-off branch, the pressure-regulating cut-off branch comprises a cut-off valve 1 and a pressure regulator 2 which are sequentially connected in series on the branch, wherein the cut-off valve 1 is connected with a cut-off execution component 4; 2 the voltage regulator is connected with commander 3, pipeline pressure and 2 back pipeline pressure of voltage regulator before 2 line pressure and the voltage regulator are connected to commander 3, and the aperture of being connected and controlling voltage regulator 2 is generated commander pressure and voltage regulator 2 according to 2 preceding pipeline pressure of voltage regulator and 2 back pipeline pressure of voltage regulator.
As an example, with reference to the description of fig. 4, a gas distribution network is shown comprising two pressure-regulating cut-off branches.
In the embodiment, a new pilot valve 5 structure is added in the existing gas transmission and distribution pipe network, the pilot valve 5 is connected in series in the gas path of the cut-off execution part 4 and the pressure-regulated pipeline, and the pilot valve 5 is also connected with the pilot pressure of the pilot device 3.
Specifically, as shown in the attached drawing 5 in the specification, the pilot valve 5 comprises a left valve body 6 and a right valve body 7, wherein an air inlet cavity I8, a valve seat I9, a valve rod I10, a diaphragm assembly I11, a diaphragm cavity I12 and a compression spring I13 are arranged in the left valve body 6, the valve seat I9 is positioned in the air inlet cavity I8, and an air inlet I14 is formed in the left valve body 6 on one side of the air inlet cavity I8; the diaphragm assembly I11 is positioned in the diaphragm cavity I12, and divides the diaphragm cavity I12 into an upper diaphragm cavity I15 and a lower diaphragm cavity I16; the compression spring I13 is positioned in the upper membrane cavity I15, and the lower end of the compression spring acts on the membrane component I11; the valve rod I10 is a hollow valve rod, the valve rod I10 is fixedly connected with the diaphragm assembly I11, the upper end of the valve rod I10 extends upwards to be connected with the air outlet 17, and the lower end of the valve rod I10 extends into the air inlet cavity I8 to be in sealing fit with the valve seat I9;
an air chamber 18, a diaphragm cavity II 19, a diaphragm assembly II 20, a valve rod II 21 and a valve seat II 22 are arranged in the right valve body 7, the diaphragm assembly II 20 is positioned in the diaphragm cavity II 19 and divides the diaphragm cavity II 19 into an upper diaphragm cavity II 23 and a lower diaphragm cavity II 24, an air inlet II 25 communicated with the upper diaphragm cavity II 23 and an air inlet III 26 communicated with the lower diaphragm cavity II 24 are arranged on the right valve body 7, a valve port 27 is fixedly arranged at the upper end of the air chamber 18, the valve rod II 21 is arranged in the valve port 27, the upper end of the valve rod II 21 extends into the lower diaphragm cavity II 24 to be in sealing fit with the diaphragm assembly II 20, the lower end of the valve rod II 21 extends downwards to form the valve port 27 to be fixedly connected with the valve seat II 22, the bottom of the valve port 27 is in sealing fit with the upper end face of the valve seat II 22, and an exhaust port 28 penetrating through the right valve body 7 is arranged at the bottom of the air chamber 18; under the action of downward pressure on the valve rod II 21, the valve seat II 22 moves downward along with the valve rod II 21, the upper end face of the valve seat II 22 is unsealed with the bottom of the valve port 27, and the bottom of the valve seat II 22 seals the exhaust port 28; a compression spring II 29 is further arranged at the upper end of the valve port 27, the lower end of the compression spring II 29 acts on a limiting table 30 in the valve port 27, and the upper end of the compression spring II 29 acts on a limiting step 31 of the valve rod II 21;
the upper end of the valve rod II 21 is provided with a semi-closed hollow cavity 32 with an upward opening, the side wall of the hollow cavity 32 is provided with a through hole 33 communicated with the valve port 27, the side wall of the valve port 27 is provided with a communicating hole 34 communicated with the air chamber 18, and a connecting cavity 35 is arranged between the air chamber 18 of the right valve body 7 and the lower diaphragm cavity I16 of the left valve body 6; a gas channel 36 is arranged between the gas inlet II 25 of the right valve body 7 and the gas outlet 17 of the left valve body 6, and an electromagnetic valve 37 for controlling the on-off of the gas channel 36 is arranged on the gas channel 36;
referring to the attached drawings 3 and 4 of the specification, the pipeline pressure behind the air inlet I14 connected with the pressure regulator 2, the air inlet II 25 is connected with the commander 3 and connected with the commander pressure, the pipeline pressure behind the air inlet III 26 connected with the pressure regulator 2, and the air outlet 17 is connected with the cutting-off execution part 4. The specific working principle of this embodiment is as follows:
when the gas transmission pipeline is in a normal working state, the commander 3 is connected with the front pipeline pressure of the pressure regulator 2 and the rear pipeline pressure of the pressure regulator 2 to generate commander pressure, then the commander pressure is connected with the pressure regulator 2 and the pilot valve 5, the difference value of P0 and P2 is a fixed value when the air inlet II 25 (from the commander pressure P0) on the right valve body 7 of the pilot valve 5 is compared with the air inlet III 26 (from the pressure P2 of the pressure-regulated pipeline), the elastic force of the compression spring II 29 is controlled to be equal to the fixed value, the resultant force of the P2 and the compression spring II 29 is equal to P0, and the diaphragm assembly II 20 is in a balanced state; the valve rod II 21 is matched and sealed with the lower end of the diaphragm assembly II 20 under the action of the compression spring II 29, gas of the gas inlet III 26 (from the pressure P2 of the pipeline after pressure regulation) cannot enter the hollow cavity 32 of the valve rod II 21, and no gas exists in the connecting cavity 35. A valve rod I10 in the left valve body 6 is matched and sealed with a valve seat I9 under the action of a compression spring I13, and an air inlet I14 (from pressure-regulated pipeline pressure P2) cannot enter a hollow airflow channel of the valve rod I10 and an air outlet 17 of the left valve body 6; the electromagnetic valve 37 arranged in the gas channel 36 is in a normally closed state, gas in the gas inlet II 25 of the right valve body 7 cannot enter the gas outlet 17 of the left valve body 6 through the gas channel 36, an executing component of the cut-off valve 1 is in a non-gas state, and the cut-off valve 1 is not cut off.
When the pipeline pressure P2 rises to a certain value after the pressure of the gas pipeline is regulated, the gas pressure P2 of the gas inlet III 26 entering the lower membrane cavity II 24 is larger than P0, the diaphragm assembly II 20 moves towards the upper membrane cavity II 23, a gap is formed between the diaphragm assembly II 20 and the upper end of the valve rod II 21, the gas in the gas inlet III 26 enters the semi-closed hollow cavity 32 of the valve rod II 21, the gas acts in the hollow cavity 32 of the valve rod II 21 to generate downward force, the elastic force of the compression spring II 29 is overcome, the valve rod II 21 moves downwards, the valve seat II 22 fixedly connected with the valve rod II 21 also moves downwards along with the valve seat II, the gas outlet 28 at the bottom of the gas chamber 18 is closed, the gas in the semi-closed hollow cavity 32 in the valve rod II 21 enters the connecting cavity 35 through the through hole 33 in the side wall of the hollow cavity 32 and the communication hole 34 of the valve port 27, then enters the lower membrane cavity I16 of the left valve body 6 through the connecting cavity 35, the balance of the diaphragm assembly I11 is damaged, the upward acting force of the diaphragm overcomes the elastic force of the compression spring 13, the diaphragm assembly I11 moves towards the upper membrane cavity, the lower membrane cavity I10, the gas pipeline pressure I10 moves, the valve rod I10 and the gas pipeline I1 is driven by the gas pipeline I1 to cut off valve seat I1, the gas pipeline 14, the gas pipeline I1, the gas pipeline 10, the gas inlet 14, the gas pipeline I1 is cut-flow-operated by the action, the gas pipeline.
When the air source at the front end of the air transmission pipeline is cut off, the pipeline pressure P2 is reduced after pressure regulation, the pressure in the lower film cavity II 24 of the right valve body 7 is reduced, the film assembly II 20 moves downwards, meanwhile, the pressure in the lower film cavity II 24 acts on the valve rod II 21 to generate a downward force which is smaller than an upward force generated by the action of the compression spring II 29 on the valve rod II 21, the valve rod II 21 moves upwards under the action of the compression spring II 29, the lower end of the film assembly II 20 is in contact sealing with the upper end of the valve rod II 21, an air flow channel from the air inlet III 26 to the interior of the pilot valve 5 is blocked, when the valve rod II 21 moves upwards, the valve seat II 22 fixedly connected with the valve rod II is driven to move upwards and simultaneously, the air outlet 28 is opened, the air originally entering the lower film cavity I16 of the left valve body 6 flows back to the air chamber 18 through the connecting cavity 35 and is discharged through the air outlet 28 at the bottom of the air chamber 18, the air inlet I16 of the left valve body 6 is restored to the atmospheric pressure, the air pressure in the lower film cavity I16 of the left valve body 6 is restored to the atmospheric pressure, the air outlet I17, the air flow channel I14 is cut off in a matched manner under the action of the air outlet I9 under the action of the air valve seat I10 under the action of the air. The pilot valve 5 automatically returns to the initial state.
If the front end cut-off valve 1 is not cut off under the set pressure, the reason may be that dust accumulated in the cut-off valve 1 is stuck, the cut-off execution component 4 can act under higher pressure, when the rear end pressure continues to rise to the set pressure of remote control, the electromagnetic valve 37 in the gas channel 36 is automatically opened, the gas with higher pressure from the gas inlet II 25 (the gas P0 from the pressure of the commander) directly flows to the gas outlet 17 through the gas channel 36 at the electromagnetic valve 37, and flows to the cut-off execution component 4 from the gas outlet 17, the cut-off valve 1 acts, and the gas source at the front end of the gas transmission line is cut off. Or when the gas transmission pipeline needs to be remotely and manually cut off in an emergency, the electromagnetic valve 37 on the pilot valve 5 can be remotely opened in the control room, the gas from the gas inlet II 25 (the gas P0 from the pressure of the pilot valve) directly flows to the gas outlet 17 through the gas channel 36 at the electromagnetic valve 37, and flows to the cutting execution component 4 from the gas outlet 17, so that the action of the cutting valve 1 is ensured, and the safety accident is avoided.
Example 2
As another preferred embodiment of the present invention, on the basis of embodiment 1, the present embodiment further elaborates the technical solution of the present invention, in the present embodiment, referring to fig. 3 in the description, the pilot valve 5 further includes a valve body iii 38, the valve body iii 38 is located above the left valve body 6 and the right valve body 7, the valve body iii 38 is provided with a through hole 52 communicated with the air outlet 17 on the left valve body 6, and the air channel 36 is located in the valve body iii 38. In the embodiment, the valve body iii 38 is provided to facilitate the processing of the gas channel 36 and the assembly of the electromagnetic valve 37, and the gas channel 36 is provided in the valve body iii 38 to protect the internal electromagnetic valve 37 from external interference and ensure the control accuracy.
As an implementation manner of the embodiment, the left valve body 6 includes an upper valve body i 39 and a lower valve body i 40, the valve seat i 9, the air inlet cavity i 8 and the air inlet i 14 are all located on the lower valve body i 40, the diaphragm cavity i 12 is formed between the upper valve body i 39 and the lower valve body i 40, the diaphragm assembly i 11 is fixed between the upper valve body i 39 and the lower valve body i 40, and openings for moving the valve rod i 10 are formed in the upper valve body i 39 and the lower valve body i 40; the upper end of a compression spring I13 acts on the inner portion of an upper valve body I39, and the lower end of the compression spring acts on the upper end of a diaphragm assembly I11. The right valve body 7 comprises an upper valve body II 44 and a lower valve body II 45, the air chamber 18, the valve port 27, the valve rod II 21, the air inlet III 26, the connecting cavity 35 and the valve seat II 22 are all positioned in the lower valve body II 45, and the air inlet II 25 is positioned on the upper valve body II 44; the diaphragm assembly II 20 is positioned between the upper valve body II 44 and the lower valve body II 45.
Example 3
As another preferred embodiment of the present invention, reference is made to fig. 3 in the specification, and this embodiment is a further detailed addition to the technical solution of the present invention in the above-mentioned embodiment 1 and embodiment 2. As shown in fig. 3 of the specification, in the present embodiment, the left valve body 6 includes an upper valve body i 39 and a lower valve body i 40, the valve seat i 9, the air inlet cavity i 8 and the air inlet i 14 are all located on the lower valve body i 40, the diaphragm cavity i 12 is formed between the upper valve body i 39 and the lower valve body i 40, the diaphragm assembly i 11 is fixed between the upper valve body i 39 and the lower valve body i 40, and openings for moving the valve rod i 10 are respectively formed on the upper valve body i 39 and the lower valve body i 40; the upper end of a compression spring I13 acts on the inner part of an upper valve body I39, and the lower end of the compression spring acts on the upper end of a diaphragm assembly I11. The diaphragm assembly I11 comprises a diaphragm I41, an upper pressing plate I42 and a lower pressing plate I43, wherein the diaphragm I41 is positioned between the upper pressing plate I42 and the lower pressing plate I43; the lower end of the compression spring I13 acts on the upper pressure plate I42. The valve rod I10 and the upper pressure plate I42 are fixed into a whole.
The right valve body 7 comprises an upper valve body II 44 and a lower valve body II 45, the air chamber 18, the valve port 27, the valve rod II 21, the air inlet III 26, the connecting cavity 35 and the valve seat II 22 are all positioned in the lower valve body II 45, and the air inlet II 25 is positioned on the upper valve body II 44; the diaphragm assembly II 20 is positioned between the upper valve body II 44 and the lower valve body II 45. A guide sleeve 46 is further arranged in the upper valve body II 44, the upper end of the diaphragm assembly II 20 is connected with a valve rod III 47, the valve rod III 47 extends upwards into the guide sleeve 46, and a guide cavity 48 matched with the valve rod III 47 is formed in the guide sleeve 46. The diaphragm assembly II 20 comprises a diaphragm II 49, an upper gland II 50 and a lower gland II 51, and the diaphragm II 49 is located between the upper gland II 50 and the lower gland II 51. The lower end of the valve rod II 47 is fixed on the upper gland II 50, and the top end of the valve rod II 21 is in sealing fit with the bottom of the lower gland II 51. The valve port 27 is assembled at the upper end of the air chamber 18, the upper end of the valve port 27 extends into the lower film cavity II 24, and the bottom of the valve port 27 is conical and is in sealing fit with the upper end face of the valve seat II 22.
Claims (10)
1. A gas transmission and distribution pipe network with remote cut-off function at least comprises a pressure-regulating cut-off branch, wherein the pressure-regulating cut-off branch comprises a cut-off valve (1) and a pressure regulator (2) which are sequentially connected in series on the branch, and a cut-off execution component (4) is connected on the cut-off valve (1); the pressure regulator (2) is connected with a commander (3), the commander (3) is connected with the front pipeline pressure of the pressure regulator (2) and the rear pipeline pressure of the pressure regulator (2), and the commander pressure is generated according to the front pipeline pressure of the pressure regulator (2) and the rear pipeline pressure of the pressure regulator (2) and is connected with the pressure regulator (2) and controls the opening degree of the pressure regulator (2); the method is characterized in that: the pressure regulating cut-off branch circuit further comprises a guide valve (5), the guide valve (5) comprises a left valve body (6) and a right valve body (7), an air inlet cavity I (8), a valve seat I (9), a valve rod I (10), a diaphragm assembly I (11), a diaphragm cavity I (12) and a compression spring I (13) are arranged in the left valve body (6), the valve seat I (9) is located in the air inlet cavity I (8), and an air inlet I (14) is formed in the left valve body (6) on one side of the air inlet cavity I (8); the diaphragm assembly I (11) is positioned in the diaphragm cavity I (12), and the diaphragm cavity I (12) is divided into an upper diaphragm cavity I (15) and a lower diaphragm cavity I (16); the compression spring I (13) is positioned in the upper membrane cavity I (15), and the lower end of the compression spring acts on the membrane component I (11); the valve rod I (10) is a hollow valve rod, the valve rod I (10) is fixedly connected with the membrane component I (11), the upper end of the valve rod I (10) extends upwards to be connected with the air outlet (17), and the lower end of the valve rod I (10) extends into the air inlet cavity I (8) to be in sealing fit with the valve seat I (9);
an air chamber (18), a diaphragm cavity II (19), a diaphragm assembly II (20), a valve rod II (21) and a valve seat II (22) are arranged in the right valve body (7), the diaphragm assembly II (20) is located in the diaphragm cavity II (19) and divides the diaphragm cavity II (19) into an upper diaphragm cavity II (23) and a lower diaphragm cavity II (24), an air inlet II (25) communicated with the upper diaphragm cavity II (23) and an air inlet III (26) communicated with the lower diaphragm cavity II (24) are arranged on the right valve body (7), a valve port (27) is fixedly arranged at the upper end of the air chamber (18), the valve rod II (21) is arranged in the valve port (27), the upper end of the valve rod II (21) extends into the lower diaphragm cavity II (24) to be in sealing fit with the diaphragm assembly II (20), the lower end of the valve rod II (21) extends downwards to form a valve port (27) which is fixedly connected with the valve seat II (22), the bottom of the valve port (27) is in sealing fit with the upper end face of the valve seat (22), and an exhaust port (28) penetrating through the right valve body (7) is arranged at the bottom of the air chamber (18); under the action of downward pressure on the valve rod II (21), the valve seat II (22) moves downward along with the valve rod II (21), the upper end face of the valve seat II (22) is unsealed from the bottom of the valve port (27), and the bottom of the valve seat II (22) blocks the exhaust port (28); a compression spring II (29) is further arranged at the upper end of the valve port (27), the lower end of the compression spring II (29) acts on a limiting table (30) in the valve port (27), and the upper end of the compression spring II (29) acts on a limiting step (31) of the valve rod II (21);
the upper end of the valve rod II (21) is provided with a semi-closed hollow cavity (32) with an upward opening, the side wall of the hollow cavity (32) is provided with a through hole (33) communicated with the valve port (27), the side wall of the valve port (27) is provided with a communicating hole (34) communicated with the air chamber (18), and a connecting cavity (35) is arranged between the air chamber (18) of the right valve body (7) and the lower membrane cavity I (16) of the left valve body (6); a gas channel (36) is arranged between the gas inlet II (25) of the right valve body (7) and the gas outlet (17) of the left valve body (6), and an electromagnetic valve (37) for controlling the on-off of the gas channel (36) is arranged on the gas channel (36); pipeline pressure behind pressure regulator (2) is connected in air inlet I (14), air inlet II (25) link to each other with commander (3), connect commander pressure, pipeline pressure behind pressure regulator (2) is connected in air inlet III (26), gas outlet (17) are connected and are cut off executive component (4).
2. A gas transmission and distribution network with remote cut-off as claimed in claim 1, characterized in that: the pilot valve further comprises a valve body III (38), the valve body III (38) is located above the left valve body (6) and the right valve body (7), a through hole (52) communicated with an air outlet (17) in the left valve body (6) is formed in the valve body III (38), and the gas channel (36) is located in the valve body III (38).
3. A gas transmission and distribution network with remote cut-off according to claim 1 or 2, characterized in that: the left valve body (6) comprises an upper valve body I (39) and a lower valve body I (40), the valve seat I (9), the air inlet oral cavity I (8) and the air inlet I (14) are all located on the lower valve body I (40), the diaphragm cavity I (12) is formed between the upper valve body I (39) and the lower valve body I (40), the diaphragm assembly I (11) is fixed between the upper valve body I (39) and the lower valve body I (40), and openings for moving the valve rod I (10) are formed in the upper valve body I (39) and the lower valve body I (40); the upper end of a compression spring I (13) acts on the inner part of an upper valve body I (39), and the lower end of the compression spring acts on the upper end of a diaphragm assembly I (11).
4. A gas transmission and distribution network with remote cut-off as claimed in claim 3, characterized in that: the diaphragm assembly I (11) comprises a diaphragm I (41), an upper pressure plate I (42) and a lower pressure plate I (43), and the diaphragm I (41) is located between the upper pressure plate I (42) and the lower pressure plate I (43); the lower end of a compression spring I (13) acts on an upper pressure plate I (42).
5. A gas transmission and distribution network with remote cut-off according to claim 4, characterized in that: and the valve rod I (10) and the upper pressure plate I (42) are fixed into a whole.
6. A gas transmission and distribution network with remote cut-off according to claim 1 or 2, characterized in that: the right valve body (7) comprises an upper valve body II (44) and a lower valve body II (45), the air chamber (18), the valve port (27), the valve rod II (21), the air inlet III (26), the connecting cavity (35) and the valve seat II (22) are all located in the lower valve body II (45), and the air inlet II (25) is located on the upper valve body II (44); and the diaphragm assembly II (20) is positioned between the upper valve body II (44) and the lower valve body II (45).
7. A gas transmission and distribution network with remote cut-off as claimed in claim 6, characterized in that: still be provided with guide pin bushing (46) in going up valve body II (44), diaphragm subassembly II (20) upper end is connected with valve rod III (47), and valve rod III (47) upwards extend to guide pin bushing (46) in, be provided with on guide pin bushing (46) with valve rod III (47) complex direction chamber (48).
8. A gas transmission and distribution network with remote cut-off as claimed in claim 7, wherein: the diaphragm assembly II (20) comprises a diaphragm II (49), an upper gland II (50) and a lower gland II (51), and the diaphragm II (49) is located between the upper gland II (50) and the lower gland II (51).
9. A gas transmission and distribution network with remote cut-off as claimed in claim 8, wherein: the lower extreme of valve rod III (47) is fixed on last gland II (50), the top of valve rod II (21) and the bottom of pushing down gland II (51) are sealed to be cooperated.
10. A gas transmission and distribution network with remote cut-off according to claim 1 or 2, characterized in that: the valve port (27) is assembled at the upper end of the air chamber (18), the upper end of the valve port (27) extends into the lower film cavity II (24), and the bottom of the valve port (27) is conical and is in sealing fit with the upper end face of the valve seat II (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310074333.8A CN115789523B (en) | 2023-02-07 | 2023-02-07 | Gas transmission and distribution pipe network with remote cut-off function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310074333.8A CN115789523B (en) | 2023-02-07 | 2023-02-07 | Gas transmission and distribution pipe network with remote cut-off function |
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| CN115789523A true CN115789523A (en) | 2023-03-14 |
| CN115789523B CN115789523B (en) | 2023-05-26 |
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| CN115789523B (en) | 2023-05-26 |
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