CN111964067B - Oil-gas dual-purpose boiler fuel automatic switching control system - Google Patents
Oil-gas dual-purpose boiler fuel automatic switching control system Download PDFInfo
- Publication number
- CN111964067B CN111964067B CN202010845240.7A CN202010845240A CN111964067B CN 111964067 B CN111964067 B CN 111964067B CN 202010845240 A CN202010845240 A CN 202010845240A CN 111964067 B CN111964067 B CN 111964067B
- Authority
- CN
- China
- Prior art keywords
- gas
- fuel
- oil
- pipeline
- valve core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
- F23D17/002—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or liquid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The invention discloses an automatic fuel switching control system of an oil-gas dual-purpose boiler, which comprises a boiler, an oil-gas dual-purpose burner and an oil-gas switching device, wherein the outlet of the burner is communicated with a combustion cavity of the boiler, the inlet of the burner is connected with the oil-gas switching device, and the oil-gas switching device is also respectively connected with a gas pipeline and a fuel pipeline; a gas electromagnetic valve is arranged on the gas pipeline, and gas pressure sensors are respectively arranged on two sides of the gas electromagnetic valve; the fuel pipeline is provided with a fuel electromagnetic valve, and two sides of the fuel electromagnetic valve are respectively provided with a fuel pressure sensor; the fuel gas and fuel oil combined control system is characterized by further comprising a controller, wherein the controller is respectively connected with the fuel gas pressure sensor, the fuel oil pressure sensor, the fuel gas electromagnetic valve and the fuel oil electromagnetic valve. The fuel automatic switching control system of the oil-gas dual-purpose boiler improves the switching efficiency; the stability of the combustion of the oil-gas dual-purpose burner can be ensured when the simultaneous switching is realized.
Description
Technical Field
The invention belongs to the technical field of automatic oil-gas switching, and particularly relates to an automatic fuel switching control system of an oil-gas dual-purpose boiler.
Background
At present, with the adjustment of national resource strategy and the enhancement of environmental protection consciousness of enterprises, oil-gas dual-purpose boilers taking natural gas and diesel (heavy) oil as main fuels are widely popularized. At present, the natural gas pipeline of most enterprises and municipal gas sharing system receive the influence that urban gas utilization peak time period air feed pressure is not enough or municipal gas pipeline breaking down suddenly easily, cause to lead to the boiler suddenly the nature to shut down under the condition that does not have the early warning, influence the production efficiency of enterprise.
Based on the above problems, most enterprises add a fuel pipeline on the basis of a gas pipeline, so that the boiler is operated by taking fuel oil as fuel under the condition of insufficient gas. In the prior art, a pressure detection device and a solenoid valve are usually arranged on a fuel gas pipeline and a fuel oil pipeline to switch between the two pipelines. However, in practical applications, there are two problems: (1) A certain distance exists between the installation positions of the two electromagnetic valves and the boiler, so that the corresponding fuel gas or fuel oil can reach the boiler after being switched after being transmitted for a certain time, and once the distance is too far, the condition that the fuel is insufficient and the boiler is flamed out can occur in the boiler; (2) In order to avoid the problem of oil-gas mixing, when the two electromagnetic valves are opened and closed, the controller firstly generates a closing signal for one of the two electromagnetic valves and closes the electromagnetic valve based on the closing signal, and after the controller acquires a feedback signal for closing the electromagnetic valve, the controller generates an opening signal for the other electromagnetic valve and then performs opening of the other electromagnetic valve, so that the overall switching time is longer, and the probability of flameout of the boiler is further increased.
The present invention has been made in view of the above problems.
Disclosure of Invention
The invention aims to provide an automatic fuel switching control system for an oil-gas dual-purpose boiler.
In order to realize the purpose, the technical scheme of the invention is as follows: the automatic fuel switching control system of the oil-gas dual-purpose boiler is characterized by comprising a boiler, an oil-gas dual-purpose burner and an oil-gas switching device, wherein an outlet of the burner is communicated with a combustion cavity of the boiler, an inlet of the burner is connected with the oil-gas switching device, and the oil-gas switching device is also connected with a gas pipeline and a fuel pipeline respectively; a gas electromagnetic valve is arranged on the gas pipeline, and gas pressure sensors are respectively arranged on two sides of the gas electromagnetic valve; the fuel pipeline is provided with a fuel electromagnetic valve, and two sides of the fuel electromagnetic valve are respectively provided with a fuel pressure sensor; the controller is respectively connected with the gas pressure sensor, the fuel pressure sensor, the gas electromagnetic valve and the fuel electromagnetic valve; the oil-gas switching device comprises a first valve body, one side of the first valve body is provided with a switching device outlet, the switching device outlet is connected with an inlet of a combustor, the first valve body is further provided with a gas inlet and a fuel inlet, the gas inlet is connected with a gas pipeline, the fuel inlet is connected with a fuel pipeline, a movable valve core is arranged in the first valve body, a gas channel and a fuel channel are arranged in the movable valve core, one end of the gas channel and one end of the fuel channel are arranged to be capable of being independently communicated with the switching device outlet based on movement of the movable valve core, and the other end of the gas channel and the other end of the fuel channel are respectively communicated with the gas pipeline and the fuel pipeline.
As the preferred technical scheme of the invention, the gas burner also comprises a remote control terminal, wherein the remote control terminal is respectively in wireless communication connection with the controller and the oil-gas dual-purpose burner; as a more preferable aspect of the present invention, the movable valve body is provided with a driving device that is provided so as to be able to drive the movable valve body to move within the first valve body. In the invention, the controller receives the detection data of the gas pressure sensor, the fuel pressure sensor and the liquid level sensor, controls the gas electromagnetic valve and the fuel electromagnetic valve to be opened and closed reversely based on the detection data, and controls the movable valve core to move, thereby realizing the switching of oil gas fuel.
According to the automatic fuel switching control system for the oil-gas dual-purpose boiler, the fuel oil channel is preferably an L-shaped channel, a sealing plug is arranged at one end of the L-shaped channel communicated with the fuel oil pipeline, one end of the sealing plug is fixedly connected with the inner wall of the first valve body through a support rod, and the length of the sealing plug is not less than the diameter of the fuel gas channel. As a preferable technical scheme of the invention, the outlet of the switching device and the gas inlet are arranged on two opposite sides of the first valve body and are positioned on the same horizontal plane, the fuel inlet is arranged on the lower side of the first valve body, the gas channel is a horizontal straight-line channel, and the fuel channel is an L-shaped channel.
According to the fuel automatic switching control system of the oil-gas dual-purpose boiler, preferably, the oil-gas switching device is further provided with an electric actuating mechanism, and the electric actuating mechanism is arranged to drive the movable valve core to move in the first valve body. In the present invention, the electric actuator serves as a driving device for the movable valve element.
The specific operation of the electric actuator driving the movable valve core is as follows: based on the driving of the electric actuating mechanism, the movable valve core moves upwards in the first valve body, in the process, the gas channel gradually misplaces with the gas pipeline, and the fuel oil channel gradually corresponds to the outlet of the switching device; based on the arrangement of the sealing plug, the fuel oil channel keeps sealed in the moving process, so that only the fuel gas channel can be conducted when the fuel gas channel and the fuel oil channel both correspond to the outlet of the switching device; when the gas channel and the gas pipeline are completely sealed in a staggered mode, the sealing plug is just matched with the port of the fuel oil channel, the movable valve core continues to move upwards until the gas channel is completely sealed, and the sealing plug is separated from the fuel oil channel, so that the fuel oil channel is conducted, and the instantaneous switching between the gas pipeline and the fuel oil pipeline is completed. Based on the setting of this structure, can effectively reduce the distance between gas passageway and the fuel oil passageway, and then reduce whole oil gas auto-change over device's volume.
According to the automatic fuel switching control system for the oil-gas dual-purpose boiler, preferably, a gas flowmeter is further arranged on the gas pipeline; one end of the fuel oil pipeline is connected with an oil storage tank, a liquid level sensor is arranged in the oil storage tank, and a fuel oil flowmeter is further arranged on the fuel oil pipeline; the controller is also connected with the gas flowmeter, the fuel flowmeter and the liquid level sensor.
According to the automatic fuel switching control system for the oil-gas dual-purpose boiler, preferably, a fuel gas buffer device is further arranged on the fuel gas pipeline, and the fuel gas buffer device is set to be capable of buffering fuel gas; the fuel pipeline is also provided with a fuel buffer device which is set to be capable of buffering fuel. In the invention, the gas buffer device and the fuel buffer device can adopt the existing storage device.
According to the automatic fuel switching control system for the oil-gas dual-purpose boiler, preferably, the gas electromagnetic valve and the oil electromagnetic valve are electromagnetic valves with the same structure, one side of each electromagnetic valve is provided with a buffer inlet and a buffer outlet, and the oil buffer device or the gas buffer device is connected between the buffer inlet and the buffer outlet through a buffer pipeline; the electromagnetic valve is internally provided with a through hole communicated with a gas pipeline or a fuel pipeline, a shunt valve core and a compensation valve core are sequentially arranged in the through hole, the shunt valve core and the compensation valve core can move in a direction perpendicular to the length direction of the through hole, and the shunt valve core can realize independent communication of the through hole and independent communication of a buffer outlet or simultaneous communication of the through hole and the buffer outlet through movement; the compensation valve core can realize independent conduction of the through hole through movement, or the through hole is simultaneously conducted with the buffer inlet.
For example, the diversion and compensation of the gas pipeline are taken as an example for explanation, when the pressure in the gas pipeline is in the supply pressure range of the oil-gas dual-purpose combustor, the diversion valve core and the compensation valve core are moved to be independently communicated with the through hole, namely, the diversion or compensation is not needed; when the pressure in the gas pipeline is higher than the supply pressure of the oil-gas dual-purpose burner, the compensating valve core is moved to be independently communicated with the through hole, the flow dividing valve core is moved to simultaneously communicate the through hole and the buffer outlet, and partial fuel in the gas pipeline is temporarily stored in a gas buffer device through the buffer outlet to reduce the pressure; when the pressure in the gas pipeline is smaller than the supply pressure of the oil-gas dual-purpose burner, the flow dividing valve core is moved to be independently communicated with the through hole, the compensation valve core is moved to simultaneously communicate the buffer inlet with the through hole, and the gas temporarily stored in the gas buffer device is supplemented into the gas pipeline to improve the gas pressure. The fuel line split and compensation are as described above.
According to the automatic fuel switching control system for the oil-gas dual-purpose boiler, preferably, a first guide hole and a second guide hole are sequentially formed in the flow dividing valve core, one end of the second guide hole is connected with the buffer outlet, and the flow dividing valve core can enable the first guide hole and the through hole to be independently communicated or enable the first guide hole and the second guide hole to be simultaneously communicated through movement; the compensation valve core is sequentially provided with a third guide hole and a fourth guide hole, one end of the fourth guide hole is connected with the buffer inlet, and the compensation valve core can enable the third guide hole to be independently communicated with the through hole or enable the third guide hole and the fourth guide hole to be simultaneously communicated with the through hole through movement.
According to the automatic fuel switching control system for the oil-gas dual-purpose boiler, preferably, a sealing mechanism is further arranged at one end, connected with the buffer outlet, of the second guide hole of the flow divider valve core, the sealing mechanism comprises a spring and a sealing baffle plate, one end of the spring is arranged on the electromagnetic valve, the other end of the spring is connected with the sealing baffle plate, and one side of the sealing baffle plate is in sealing fit with the end part of the flow divider valve core through a guide inclined plane. According to a specific embodiment of the invention, when the diverter valve core is moved to independently communicate the through hole with the buffer outlet, the sealing baffle plate presses down the end part of the diverter valve core under the action of the spring. This scheme has realized the closure of whole gas solenoid valve.
The automatic fuel switching control system for the oil-gas dual-purpose boiler preferably further comprises a valve core driving mechanism, wherein the valve core driving mechanism comprises a permanent magnet plate, a shunt electromagnetic plate and a compensation electromagnetic plate; the electromagnetic valve comprises a permanent magnet plate, a shunt electromagnetic plate and a compensation electromagnetic plate, wherein the permanent magnet plate, the shunt electromagnetic plate and the compensation electromagnetic plate are arranged on the same side of a through hole in the electromagnetic valve, the shunt electromagnetic plate is arranged at the end part of a shunt valve core, the compensation permanent magnet plate is arranged at the end part of the compensation valve core, the shunt electromagnetic plate and the compensation electromagnetic plate are arranged opposite to the permanent magnet plate, and the shunt electromagnetic plate and the compensation electromagnetic plate are arranged to be capable of being independently electrified.
According to the automatic fuel switching control system for the oil-gas dual-purpose boiler, preferably, the permanent magnet plate is provided with a convex part and a concave part; the shunt electromagnetic plate is opposite to the convex part, one end of a first guide rod is fixed on the shunt electromagnetic plate, and the other end of the first guide rod penetrates through the permanent magnetic plate; the compensation electromagnetic plate is arranged opposite to the concave part, one end of a second guide rod is fixed on the concave part, and the other end of the second guide rod penetrates through the compensation electromagnetic plate. Specifically, the arrangement of the first guide rod and the second guide rod improves the stability of the movement of the corresponding valve core on one hand, and is also used for marking the movement distance of the corresponding valve core on the other hand, so that the accuracy of conduction, shunting and compensation is ensured.
The beneficial effects of the invention are:
according to the fuel automatic switching control system for the oil-gas dual-purpose boiler, the oil-gas switching device is arranged among the gas electromagnetic valve, the fuel oil electromagnetic valve and the oil-gas dual-purpose burner, and the oil-gas switching device changes the communication positions of the two channels through the movement of the movable valve core, so that the switching between a gas pipeline and a fuel oil pipeline is instantly realized, and the switching efficiency is improved; the simultaneous switching of the two electromagnetic valves can be realized, and based on the limitation of the oil-gas switching device, the mutual interference of two fuels can be effectively avoided during the simultaneous switching, so that the combustion stability of the oil-gas dual-purpose combustor is ensured;
furthermore, according to the preferable technical scheme of the invention, the oil-gas switching device is also provided with a sealing plug matched with the channel of the oil-gas switching device, so that single conduction of the two channels can be realized, the distance between the oil-gas switching devices can be reduced to the maximum extent, and the whole oil-gas switching device has the advantages of small volume and compact structure;
furthermore, according to the preferable technical scheme of the invention, corresponding fuel is filled in advance in the fuel pipeline and the fuel pipeline between the two electromagnetic valves and the oil-gas dual-purpose combustor through the buffer device, so that the condition that the oil-gas dual-purpose combustor has no fuel when the two electromagnetic valves are switched simultaneously is avoided, and the requirement on the installation position of the electromagnetic valve in the whole system is also reduced.
Furthermore, according to the preferable technical scheme of the invention, the structures of the gas electromagnetic valve and the fuel electromagnetic valve can realize effective shunting when the pressure in the pipeline is overlarge and buffer redundant fuel in the buffer device; the fuel that buffers when pressure is less through buffer supplements the improvement pressure, probability that on the one hand can frequent switching of greatly reduced, and on the other hand its pressure remains in the standard level throughout when guaranteeing that fuel gets into the dual-purpose combustor of oil gas, can further guarantee the stability of the dual-purpose combustor burning of oil gas from this.
Drawings
FIG. 1 is a schematic structural diagram of an automatic fuel switching control system of an oil and gas dual-purpose boiler of the present invention.
Fig. 2 is a schematic structural diagram of an oil-gas switching device of the automatic fuel switching control system of the oil-gas dual-purpose boiler of the invention.
FIG. 3 is a schematic structural diagram of an electromagnetic valve of the automatic fuel switching control system of the oil-gas dual-purpose boiler of the present invention.
Fig. 4 is an enlarged view of the invention at a in fig. 3.
FIG. 5 is a schematic structural diagram of the fuel gas electromagnetic valve of the automatic fuel switching control system for an oil-gas dual-purpose boiler according to the present invention when it is turned on.
Fig. 6 is a schematic structural view of the fuel gas electromagnetic valve of the automatic fuel switching control system for an oil-gas dual-purpose boiler according to the present invention during flow diversion.
Fig. 7 is a schematic structural diagram of the fuel gas electromagnetic valve of the automatic fuel switching control system of the oil and gas dual-purpose boiler in compensation.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Examples1
As shown in fig. 1, the fuel automatic switching control system of the oil-gas dual-purpose boiler comprises a boiler 15, an oil-gas dual-purpose burner 2 and an oil-gas switching device 1, wherein an outlet of the burner 2 is communicated with a combustion cavity of the boiler, an inlet of the burner 2 is connected with the oil-gas switching device 1, and the oil-gas switching device 1 is also connected with a gas pipeline 7 and a fuel pipeline 10 respectively; a gas flowmeter 5 and a gas electromagnetic valve 3 are sequentially arranged on the gas pipeline 7, and gas pressure sensors 6 are respectively arranged on two sides of the gas electromagnetic valve 3; a fuel flow meter 12 and a fuel electromagnetic valve 13 are arranged on the fuel pipeline, fuel pressure sensors 11 are respectively arranged on two sides of the fuel electromagnetic valve 13, an oil storage tank 9 is also connected to one end of the fuel pipeline 10, and a liquid level sensor 8 is arranged in the oil storage tank 9; the fuel gas and liquid level sensor is characterized by further comprising a controller 4, wherein the controller 4 is respectively connected with a fuel gas pressure sensor 6, a fuel oil pressure sensor 11, a fuel gas flowmeter 5, a fuel oil flowmeter 12, a liquid level sensor 8, a fuel gas electromagnetic valve 3 and a fuel oil electromagnetic valve 13; the specific structure of the oil-gas switching device is as follows:
as shown in fig. 2, the oil-gas switching device includes a first valve 101, one side of the first valve 101 is provided with a switching device outlet, the switching device outlet is connected with an inlet of the burner 2, one side of the first valve 101 opposite to the switching device outlet is further provided with a gas inlet, the bottom side of the first valve 101 is further provided with a fuel inlet, the gas inlet is connected with a gas pipeline 7, the fuel inlet is connected with a fuel pipeline 10, the first valve 101 is internally provided with a movable valve core 102, the movable valve core 102 is internally provided with a linear channel 103 and an L-shaped channel 104, one end of the L-shaped channel 104 communicated with the fuel pipeline 10 is internally provided with a sealing plug 105, the bottom end of the sealing plug 105 is fixedly connected with the inner wall of the first valve 101 through a support rod, and the length of the sealing plug 105 is greater than the diameter of the linear channel 103; the fuel gas pipeline switching valve further comprises an electric actuator 106, the electric actuator 106 is used for driving the movable valve core 102 to move in the first valve body 101, one end of the linear channel 103 and one end of the L-shaped channel 104 can be independently communicated with the outlet of the switching device based on the movement of the movable valve core 102, and the other end of the linear channel 103 and the other end of the L-shaped channel 104 are respectively communicated with the fuel gas pipeline 7 and the fuel oil pipeline 10.
Example 2
The present embodiment is the same as embodiment 1 except for the following configuration.
The gas solenoid valve and the fuel solenoid valve of the present embodiment are solenoid valves having the same structure, and the solenoid valves having the above structures are all the same as the structure of the gas solenoid valve 3 shown in fig. 3, and the following specific description is made by taking this as an example:
a buffer inlet 343 and a buffer outlet 333 are formed in one side of the gas electromagnetic valve 3, and the gas buffer device is connected between the buffer inlet 343 and the buffer outlet 333 through a buffer pipeline; a through hole 31 communicated with a gas pipeline is formed in the gas electromagnetic valve 3, a flow dividing valve core 33 and a compensating valve core 34 are sequentially arranged in the through hole 31, and the flow dividing valve core 33 and the compensating valve core 34 can move in a direction perpendicular to the length direction of the through hole 31; the shunt valve core 33 is provided with a first guide hole 331 and a second guide hole 332 in sequence, one end of the second guide hole 332 is connected with a buffer outlet 333, and the shunt valve core 33 can independently conduct the first guide hole 331 and the through hole 31 or simultaneously conduct the first guide hole 331 and the second guide hole 332 and the through hole 31 through movement; the compensation valve spool 34 is sequentially provided with a third guide hole 341 and a fourth guide hole 342, one end of the fourth guide hole 342 is connected to the buffer inlet 343, and the compensation valve spool 34 can make the third guide hole 341 and the through hole 31 independently conduct by moving, or make the third guide hole 341 and the fourth guide hole 342 conduct with the through hole 31 at the same time; the valve core driving mechanism is connected with the valve core driving mechanism;
as shown in fig. 3 to 4, the sealing mechanism 39 is disposed at an end portion of one end of the second guide hole 332 of the flow divider valve core 33, which is connected to the buffer outlet 333, the sealing mechanism 39 includes a spring 391 and a sealing baffle 392, one end of the spring 391 is disposed on the gas solenoid valve 3, the other end of the spring 391 is connected to the sealing baffle 392, and a guiding inclined surface is in sealing fit between one side of the sealing baffle 392 and the end portion of the flow divider valve core 33;
as shown in fig. 3, the spool drive mechanism includes a permanent magnet plate 32, a shunt magnet plate 37, and a compensation magnet plate 35; the permanent magnet plate 32, the shunt electromagnetic plate 37 and the compensation electromagnetic plate 35 are all arranged on the same side (the side opposite to the buffer outlet 333 and the buffer inlet 343) of the through hole 31 in the gas solenoid valve 3, the shunt electromagnetic plate 37 is arranged at the end of the shunt valve core 33, the compensation permanent magnet plate 35 is arranged at the end of the compensation valve core 34, the shunt electromagnetic plate 37 and the compensation electromagnetic plate 35 are both arranged opposite to the permanent magnet plate 32, and the shunt electromagnetic plate 37 and the compensation electromagnetic plate 35 can be independently electrified; the permanent magnet plate 32 is provided with a convex part and a concave part; the shunt electromagnetic plate 37 is arranged opposite to the convex part, one end of a first guide rod 38 is fixed on the shunt electromagnetic plate 37, and the other end of the first guide rod 38 penetrates through the permanent magnetic plate 32; the compensation electromagnetic plate 35 is arranged opposite to the concave part, one end of a second guide rod 36 is fixed on the concave part, and the other end of the second guide rod 36 penetrates through the compensation electromagnetic plate 35.
Specifically, the automatic switching process and principle of the oil-gas switching device are as follows:
s1, boiler operators confirm that relevant fuel pipelines (including a gas pipeline 7 and a fuel pipeline 10) are normal, preparation work before starting is carried out, a boiler electric control system is electrified, and a program is initialized. Checking whether the monitoring data of the gas pressure sensor 6, the fuel pressure sensor 11 and the liquid level sensor 8 are normal or not; if not, checking and maintaining are required, and the computer is started after the data detection is determined to be normal; if yes, executing S2.
S2, executing gas pressure P in gas pipeline 7 based on gas pressure sensor 6 q The controller acquires the detection data and judges P q 、P q1 And P q2 In which P is q1 Supplying the gas normally combusted by the oil-gas dual-purpose combustor 2 with the lowest pressure value P q2 The gas normally combusted by the oil-gas dual-purpose combustor 2 supplies the highest pressure value;
if P q ＞P q2 The controller 4 is used for controlling the gas electromagnetic valve 3 to be opened, conducting the gas pipeline 7 and executing the gas pressure shunting in the gas pipeline 7, the shunting operation can be based on the shunting operation of the gas electromagnetic valve 3 (the shunting operation is described below), after the shunting operation is finished, the oil-gas switching device 1 is controlled to be switched to a conducting state of the gas pipeline 7 and the oil-gas dual-purpose burner 2, and the boiler and the oil-gas dual-purpose burner 2 are started and run in a gas mode;
if P q2 ＞P q ≥P q1 The controller 4 is used for controlling the gas electromagnetic valve 3 to be opened, the gas pipeline 7 to be conducted, after the conduction is completed, the oil-gas switching device 1 is controlled to be switched to a conduction state of the gas pipeline 7 and the oil-gas dual-purpose burner 2, and the boiler and the oil-gas dual-purpose burner 2 are started to operate in a gas mode;
if P q ＜P q1 Performing gas switching delay countdown based on the controller 4, and counting downTime pre-positioning T 1 If at T 1 Within time, P q Is restored to P q ＞P q2 Or P q2 ＞P q ≥P q1 If at any state, corresponding operation is correspondingly executed, if at T 1 P after the end of time q1 ＞P q Step S3 is executed. Wherein, with respect to P q The restoration of (b) may be based on the compensation operation of the gas solenoid valve 3 (the compensation operation is described below), or may be based on the fluctuation of the gas supply itself.
S3, controlling the gas electromagnetic valve 3 to be closed based on the controller 4, and executing fuel oil pressure P in the fuel oil pipeline 10 based on the fuel oil pressure sensor 11 y Based on the liquid level sensor 8, performs the detection of the remaining amount L of the fuel in the fuel tank 9 y The controller 4 acquires the detection data and judges P y 、P y1 And P y2 The relationship between and L y And L y1 In which P is y1 Supplying the lowest pressure value, P, for the fuel gas normally combusted by the dual-purpose oil and gas combustor 2 y2 The fuel oil normally burnt by the oil-gas dual-purpose burner 2 supplies the highest pressure value L y1 For realizing normal combustion T of oil-gas dual-purpose combustor 2 2 Minimum amount of fuel required for time, wherein T 2 The minimum operation time is the minimum operation time when the gas mode is switched to the oil mode, and frequent switching of the boiler between the gas operation and the oil operation is avoided on the basis of the minimum operation time;
if L is y ≥L y1 And P is y ＞P y2 The controller 4 is used for controlling the fuel oil electromagnetic valve 13 to be opened, conducting the fuel oil pipeline 10 and executing the shunting of the fuel oil pressure in the fuel oil pipeline 10, the shunting can be based on the shunting operation of the fuel oil electromagnetic valve 13 (the shunting operation is the same as that of the fuel gas electromagnetic valve), after the shunting is finished, the fuel oil and gas switching device 1 is controlled to be switched to a conducting state of the fuel oil pipeline 10 and the oil and gas dual-purpose combustor 2, and the boiler and oil and gas dual-purpose combustor 2 is started and runs in a fuel oil mode;
if L is y ≥L y1 And P is y2 ＞P y ≥P y1 The controller 4 is used for controlling the fuel oil electromagnetic valve 13 to be opened, the fuel oil pipeline 10 to be conducted, and after the conduction is completed, the fuel oil and gas switching device 1 is controlled to be switched toThe fuel pipeline 10 and the dual-purpose burner 2 of oil gas are in a conducting state, the boiler and dual-purpose burner 2 of oil gas are started, run in the fuel mode;
if L is y ＜L y1 Or P y ＜P y1 And the stop of the boiler and oil-gas dual-purpose burner 2 is executed.
And S4, after the boiler and oil-gas dual-purpose combustor 2 operates in a fuel mode, the remote monitoring terminal 14 acquires the operation data of the controller 4 and the oil-gas dual-purpose combustor 2 and executes alarm reminding when the fuel gas is switched to the fuel.
S5, after the boiler and oil-gas dual-purpose combustor 2 operates in the fuel mode, if P is q Is restored to P q ＞P q2 Or P q2 ＞P q ≥P q1 If the switching is requested, displaying whether the switching is requested in the display components of the remote monitoring terminal 14 and the controller 4; if yes, executing step S8; otherwise, the fuel oil mode operation is maintained.
S6, after the boiler and oil-gas dual-purpose combustor 2 operates in the fuel mode, if L appears y ＜L y1 Or P y ＜P y1 Based on the controller 4, the gas switching delay countdown is executed, and the countdown time is preset to a preset position T 3 (ii) a If at T 3 Within time, L y Is restored to L y ≥L y1 A state of (A), and P y Is restored to P y ＞P y2 Or P y2 ＞P y ≥P y1 If any, corresponding operation of the step S3 is correspondingly executed; if at T 3 After time L y ＜L y1 Or P y ＜P y1 Step S7 is executed.
S7, executing gas pressure P in gas pipeline 7 based on gas pressure sensor 6 q The controller 4 acquires the detection data and judges P q 、P q1 And P q2 The relationship between;
P q ＞P q2 or P q2 ＞P q ≥P q1 The fuel electromagnetic valve 13 is controlled to be closed based on the controller 4, the gas electromagnetic valve 3 is controlled to be opened, and corresponding operations in step S2 are performed.
S8, the boiler and oil-gas dual-purpose combustor 2 successfully completes switching from the fuel oil mode to the gas mode, the boiler and oil-gas dual-purpose combustor operates in the gas mode, the remote monitoring terminal 14 obtains operation data of the controller 4 and the oil-gas dual-purpose combustor 2, and alarm reminding of switching from fuel oil to gas is executed.
Regarding the flow dividing operation and the compensating operation of the gas solenoid valve 3 and the oil solenoid valve 13, the gas solenoid valve is specifically described as an example as shown in fig. 3 to 7:
(1) Conditions for performing the shunting operation or the compensating operation:
When pressure (P) q ) 1 ＞P q2 Then, a shunting operation is executed, and P is satisfied after the shunting operation q2 ＞(P q ) 2 ≥P q1 。
When pressure (P) q ) 1 ＜P q2 When is at T 1 Performing compensation operation within time, after the compensation operation, satisfying P q2 ＞(P q ) 2 ≥P q1 (ii) a If the above condition is not satisfied after the compensation, the handover is performed.
(2) The specific steps of executing the shunting operation or the compensation operation are as follows:
as shown in fig. 3, the gas solenoid valve 3 is in a closed state, and at this time, each structure in the gas solenoid valve 3 is in an initial position, the sealing baffle 332 is sealed at one end of the flow divider valve core 33 under the limitation of the spring 331, so that the second guide hole 342 in the flow divider valve core 33 is closed, and the first guide hole 341 in the flow divider valve core 33 and the through hole 31 are closed, thereby effectively realizing the closure of the entire gas solenoid valve 3.
As shown in fig. 5, when the pressure (Pq) on the gas inlet side of the gas solenoid valve 3 is applied 1 Satisfy P q2 ＞(P q ) 1 ≥P q1 When the condition (2) is satisfied, the solenoid valve is turned onThe operation steps are specifically as follows: when the shunt electromagnetic plate 37 in the shunt valve core 33 is energized, the shunt electromagnetic plate 37 and the permanent magnetic plate 32 repel each other, so that the shunt valve core 33 moves to the position shown in fig. 5 to the left, and at this time, the first guide hole 331 and the third guide hole 341 in the shunt valve core 33 and the compensation valve core 34 are both independently communicated with the through hole 31, thereby forming the conducting state of the gas electromagnetic valve 3.
As shown in fig. 6, when the gas solenoid valve 3 is on the inlet side (P) q ) 1 Satisfies the pressure (P) q ) 1 ＞P q2 When the condition (2) is satisfied, executing a shunting operation, wherein the shunting operation comprises the following steps: the shunt electromagnetic plate 37 of the shunt valve core 33 is electrified by reverse current, so that the shunt electromagnetic plate 37 and the permanent magnetic plate 32 attract each other, the shunt valve core 33 moves to the right under the action of magnetic attraction force, the shunt electromagnetic plate 37 is powered off after moving for a specified distance, the shunt valve core 33 is positioned at the position shown in fig. 6, the third guide hole 341 of the compensation valve core 34 is independently communicated with the through hole 31, the first guide hole 331 and the second guide hole 332 of the shunt valve core 33 are simultaneously communicated with the through hole 31, and the gas is shunted through the first guide hole 341 and the second guide hole 342 after entering the through hole 31, so that the gas guided out of the shunt valve core 33 into the gas pipeline 7 is reduced, and the shunt effect is achieved; of the gas outlet side of the gas solenoid valve 3 after the flow-dividing operation (P) q ) 2 Should satisfy P q2 ＞(P q ) 2 ≥P q1 The conditions of (1).
As shown in fig. 6, when the gas solenoid valve 3 is on the gas inlet side (P) q ) 1 Satisfies the pressure (P) q ) 1 ＜P q2 Performing a compensation operation, the compensation operation comprising the steps of: the compensation electromagnetic plate 35 of the compensation valve core 34 is electrified, so that the compensation electromagnetic plate 35 and the permanent magnetic plate 32 are mutually attracted, the compensation valve core 34 moves to the right under the action of magnetic attraction, the compensation electromagnetic plate 35 is powered off after moving for a specified distance, the compensation valve core 34 is positioned at the position shown in figure 7, at the moment, the first guide hole 331 of the flow dividing valve core 33 is independently communicated with the through hole 31, the third guide hole 341 and the fourth guide hole 342 in the compensation valve core 34 are simultaneously communicated with the through hole 31 for air supplement, the effect of gas compensation in the gas pipeline 7 is achieved, and the gas outlet side (P side) of the gas electromagnetic valve 3 is compensated (P side) after operation q ) 2 Should satisfy P q2 ＞(P q ) 2 ≥P q1 The conditions of (1).
Based on the shunting operation and the compensation operation, the problem of unstable supply of part of gas can be effectively counteracted, so that the pressure of the gas entering the oil-gas dual-purpose combustor 2 always meets the requirement P q2 ＞P q ≥P q1 Thereby achieving the effect of reducing the switching probability and avoiding frequent switching under the condition of unstable gas.
To sum up, taking fuel oil to fuel gas switching as an example, in the closing process of the fuel oil electromagnetic valve 13, the fuel gas electromagnetic valve 3 is synchronously opened, at this time, the oil-gas switching device 1 is still kept to be conducted with the fuel oil pipeline 10, so that the fuel gas can fill the whole fuel gas pipeline 7 through the fuel gas electromagnetic valve 3, after the fuel oil electromagnetic valve 13 is completely closed, the controller 4 obtains closing feedback, and then instantaneous switching of the oil-gas switching device 1 is carried out, at this time, because the fuel gas pipeline 7 is filled with P q2 ＞(P q ) 1 ≥P q1 The gas can still keep good and stable operation of the oil-gas dual-purpose burner 2 after instantaneous switching.
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Claims (4)
1. The automatic fuel switching control system of the oil-gas dual-purpose boiler is characterized by comprising a boiler, an oil-gas dual-purpose burner and an oil-gas switching device, wherein an outlet of the burner is communicated with a combustion cavity of the boiler, an inlet of the burner is connected with the oil-gas switching device, and the oil-gas switching device is also connected with a gas pipeline and a fuel pipeline respectively; a gas electromagnetic valve is arranged on the gas pipeline, and gas pressure sensors are respectively arranged on two sides of the gas electromagnetic valve; the fuel pipeline is provided with a fuel electromagnetic valve, and two sides of the fuel electromagnetic valve are respectively provided with a fuel pressure sensor; the controller is respectively connected with the gas pressure sensor, the fuel pressure sensor, the gas electromagnetic valve and the fuel electromagnetic valve;
the oil-gas switching device comprises a first valve body, wherein one side of the first valve body is provided with a switching device outlet, the switching device outlet is connected with an inlet of a combustor, the first valve body is also provided with a gas inlet and a fuel inlet, the gas inlet is connected with a gas pipeline, the fuel inlet is connected with a fuel pipeline, a movable valve core is arranged in the first valve body, a gas channel and a fuel channel are arranged in the movable valve core, one end of the gas channel and one end of the fuel channel are independently communicated with the switching device outlet based on the movement of the movable valve core, and the other end of the gas channel and the other end of the fuel channel are respectively communicated with the gas pipeline and the fuel pipeline;
the gas pipeline is also provided with a gas buffer device, and the gas buffer device is set to be capable of buffering gas; the fuel pipeline is also provided with a fuel buffer device which is set to be capable of buffering fuel;
the fuel gas electromagnetic valve and the fuel oil electromagnetic valve are electromagnetic valves with the same structure, one side of each electromagnetic valve is provided with a buffer inlet and a buffer outlet, and the fuel oil buffer device or the fuel gas buffer device is connected between the buffer inlet and the buffer outlet through a buffer pipeline; the electromagnetic valve is internally provided with a through hole communicated with a gas pipeline or a fuel pipeline, a shunt valve core and a compensation valve core are sequentially arranged in the through hole, the shunt valve core and the compensation valve core can move in a direction perpendicular to the length direction of the through hole, and the shunt valve core can realize independent communication of the through hole and independent communication of a buffer outlet or simultaneous communication of the through hole and the buffer outlet through movement; the compensation valve core can realize independent conduction of the through hole through movement, or the through hole and the buffer inlet are simultaneously conducted;
the shunt valve core is sequentially provided with a first guide hole and a second guide hole, one end of the second guide hole is connected with the buffer outlet, and the shunt valve core can enable the first guide hole and the through hole to be independently conducted or the first guide hole and the second guide hole to be simultaneously conducted through the through hole by moving; the compensation valve core is sequentially provided with a third guide hole and a fourth guide hole, one end of the fourth guide hole is connected with the buffer inlet, and the compensation valve core can independently conduct the third guide hole and the through hole or simultaneously conduct the third guide hole and the fourth guide hole and the through hole through movement;
one end of the second guide hole of the shunt valve core, which is connected with the buffer outlet, is also provided with a sealing mechanism, the sealing mechanism comprises a spring and a sealing baffle plate, one end of the spring is arranged on the electromagnetic valve, the other end of the spring is connected with the sealing baffle plate, and one side of the sealing baffle plate is in sealing fit with the end part of the shunt valve core through a guide inclined plane;
the automatic fuel switching control system for the oil-gas dual-purpose boiler further comprises a valve core driving mechanism, wherein the valve core driving mechanism comprises a permanent magnet plate, a shunt electromagnetic plate and a compensation electromagnetic plate; wherein the content of the first and second substances,
the permanent magnet plate, the shunt electromagnetic plate and the compensation electromagnetic plate are all arranged on the same side of a through hole in the electromagnetic valve, the shunt electromagnetic plate is arranged at the end part of the shunt valve core, the permanent magnet plate is arranged at the end part of the compensation valve core, the shunt electromagnetic plate and the compensation electromagnetic plate are both arranged opposite to the permanent magnet plate, and the shunt electromagnetic plate and the compensation electromagnetic plate can be independently electrified;
the permanent magnet plate is provided with a convex part and a concave part; the shunt electromagnetic plate is opposite to the convex part, one end of a first guide rod is fixed on the shunt electromagnetic plate, and the other end of the first guide rod penetrates through the permanent magnetic plate; the compensation electromagnetic plate is arranged opposite to the concave part, one end of a second guide rod is fixed on the concave part, and the other end of the second guide rod penetrates through the compensation electromagnetic plate.
2. The automatic fuel switching control system for the oil-gas dual-purpose boiler according to claim 1, wherein the fuel oil passage is an L-shaped passage, a sealing plug is arranged in one end of the L-shaped passage communicated with the fuel oil pipeline, one end of the sealing plug is fixedly connected with the inner wall of the first valve body through a support rod, and the length of the sealing plug is not less than the diameter of the fuel gas passage.
3. The automatic fuel switching control system for oil and gas dual-purpose boilers as claimed in claim 1, wherein the oil and gas switching device is further provided with an electric actuator, and the electric actuator is configured to drive the movable valve core to move in the first valve body.
4. The automatic fuel switching control system for oil and gas dual-purpose boilers as claimed in claim 1, wherein a gas flow meter is further provided on the gas pipeline; one end of the fuel oil pipeline is connected with an oil storage tank, a liquid level sensor is arranged in the oil storage tank, and a fuel oil flowmeter is further arranged on the fuel oil pipeline; the controller is also connected with the gas flowmeter, the fuel flowmeter and the liquid level sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010845240.7A CN111964067B (en) | 2020-08-20 | 2020-08-20 | Oil-gas dual-purpose boiler fuel automatic switching control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010845240.7A CN111964067B (en) | 2020-08-20 | 2020-08-20 | Oil-gas dual-purpose boiler fuel automatic switching control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111964067A CN111964067A (en) | 2020-11-20 |
| CN111964067B true CN111964067B (en) | 2022-11-29 |
Family
ID=73389778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010845240.7A Active CN111964067B (en) | 2020-08-20 | 2020-08-20 | Oil-gas dual-purpose boiler fuel automatic switching control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111964067B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07158847A (en) * | 1993-12-02 | 1995-06-20 | Chugai Ro Co Ltd | Method of oil purge in heat accumulating-type burner system |
| CN101163930A (en) * | 2005-04-19 | 2008-04-16 | 株式会社日本触媒 | Automatic four-port selector valve |
| CN102943713A (en) * | 2012-11-09 | 2013-02-27 | 宁波中策动力机电集团有限公司 | Fuel oil/gas control and switching system of dual-fuel internal combustion engine |
| CN102980208A (en) * | 2012-11-19 | 2013-03-20 | 哈尔滨工程大学 | Dual-fuel spray nozzle for oil-gas automatic switching in chemical heat return circulation |
| CN102997227A (en) * | 2012-12-11 | 2013-03-27 | 克雷登热能设备(浙江)有限公司 | Switching device used for combustion of boiler and switching method |
| CN203131041U (en) * | 2013-02-19 | 2013-08-14 | 嘉兴诚易科技有限公司 | Buffering type flow adjusting gas electromagnetic valve |
| CN104321591A (en) * | 2012-03-27 | 2015-01-28 | 科普莱赛泰克公司 | Regulation valve for a gas cooking appliance and gas cooking appliance incorporating said regulation valve |
| CN204512534U (en) * | 2015-03-04 | 2015-07-29 | 钱江集团浙江亿江机电有限公司 | A kind of double fuel ball valve |
| CN104864124A (en) * | 2015-05-30 | 2015-08-26 | 夏品清 | Oil-gas instantaneous switching device and working mode thereof |
| CN107631055A (en) * | 2015-06-12 | 2018-01-26 | 李丽容 | The linkage switching valve and its method of work of a kind of oil gas carburetor |
| CN110631122A (en) * | 2019-09-26 | 2019-12-31 | 徐州瑾鸿电气有限公司 | Dual-fuel heater |
| CN111173962A (en) * | 2020-01-20 | 2020-05-19 | 广东聚德阀门科技有限公司 | Natural gas and liquefied gas change-over valve and gas room heater |
-
2020
- 2020-08-20 CN CN202010845240.7A patent/CN111964067B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07158847A (en) * | 1993-12-02 | 1995-06-20 | Chugai Ro Co Ltd | Method of oil purge in heat accumulating-type burner system |
| CN101163930A (en) * | 2005-04-19 | 2008-04-16 | 株式会社日本触媒 | Automatic four-port selector valve |
| CN104321591A (en) * | 2012-03-27 | 2015-01-28 | 科普莱赛泰克公司 | Regulation valve for a gas cooking appliance and gas cooking appliance incorporating said regulation valve |
| CN102943713A (en) * | 2012-11-09 | 2013-02-27 | 宁波中策动力机电集团有限公司 | Fuel oil/gas control and switching system of dual-fuel internal combustion engine |
| CN102980208A (en) * | 2012-11-19 | 2013-03-20 | 哈尔滨工程大学 | Dual-fuel spray nozzle for oil-gas automatic switching in chemical heat return circulation |
| CN102997227A (en) * | 2012-12-11 | 2013-03-27 | 克雷登热能设备(浙江)有限公司 | Switching device used for combustion of boiler and switching method |
| CN203131041U (en) * | 2013-02-19 | 2013-08-14 | 嘉兴诚易科技有限公司 | Buffering type flow adjusting gas electromagnetic valve |
| CN204512534U (en) * | 2015-03-04 | 2015-07-29 | 钱江集团浙江亿江机电有限公司 | A kind of double fuel ball valve |
| CN104864124A (en) * | 2015-05-30 | 2015-08-26 | 夏品清 | Oil-gas instantaneous switching device and working mode thereof |
| CN107631055A (en) * | 2015-06-12 | 2018-01-26 | 李丽容 | The linkage switching valve and its method of work of a kind of oil gas carburetor |
| CN110631122A (en) * | 2019-09-26 | 2019-12-31 | 徐州瑾鸿电气有限公司 | Dual-fuel heater |
| CN111173962A (en) * | 2020-01-20 | 2020-05-19 | 广东聚德阀门科技有限公司 | Natural gas and liquefied gas change-over valve and gas room heater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111964067A (en) | 2020-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2008120550A1 (en) | Flow rate control valve for clutch control device | |
| CN207920989U (en) | A kind of throttling speed control circuit for maintaining hydraulic pressure system speed to stablize | |
| CN1544800A (en) | Pressure differential style air valve variation control system | |
| CN111964067B (en) | Oil-gas dual-purpose boiler fuel automatic switching control system | |
| CN102937150A (en) | Moment-limiting clutch hydraulic control system of hybrid electric vehicle and control method thereof | |
| JPH02225804A (en) | Fuel regulation servo unit | |
| CN102434507B (en) | Engineering machinery and load sensitivity control system and control method thereof | |
| CN202327279U (en) | Self-operated pressure regulating valve | |
| CN102563191A (en) | Control valve group for pneumatic positioner | |
| CN101865172B (en) | Active piloted active servo proportional valve | |
| CN208592373U (en) | A kind of low-power consumption hydraulic position holding system with on-line proving function | |
| CN103836019A (en) | Fast-charging hydraulic shift valve | |
| CN202531969U (en) | Control valve bank for pneumatic positioner | |
| CN202692444U (en) | Improved structure for pressure difference startup device for combustion gas water heater | |
| CN219796194U (en) | Compensation type emergency electromagnetic valve | |
| CN108953301B (en) | Oil supplementing system | |
| CN201096025Y (en) | Engine fuel automatic supplier | |
| CN201096083Y (en) | Pressure medium delivery pump zero-pressure actuating apparatus | |
| CN104314903A (en) | Fast response device, hydraulic load sensing system and engineering vehicle | |
| CN216131459U (en) | High-pressure pneumatic control device and pneumatic emergency cut-off shear valve using same | |
| JPS59165847A (en) | Output control device for starling engine | |
| CN108036092B (en) | Automatic selection valve for air source of oven | |
| CN2791404Y (en) | Automatic control air-valve | |
| CN218954107U (en) | Gas valve body and gas valve | |
| CN218670845U (en) | Baffle valve opening and closing control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |