CN114352795B - Bus-controlled air compensating valve for pneumatic conveying and control system - Google Patents
Bus-controlled air compensating valve for pneumatic conveying and control system Download PDFInfo
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- CN114352795B CN114352795B CN202111681096.9A CN202111681096A CN114352795B CN 114352795 B CN114352795 B CN 114352795B CN 202111681096 A CN202111681096 A CN 202111681096A CN 114352795 B CN114352795 B CN 114352795B
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Abstract
The invention discloses a bus-controlled pneumatic conveying air compensating valve and a control system, wherein the bus-controlled pneumatic conveying air compensating valve comprises a valve body, a central control unit, a pressure core body and a miniature electromagnetic valve, the valve body comprises an upper valve body, a main valve body and a lower valve body, the upper valve body is arranged at the top of the main valve body, the lower valve body is arranged at the bottom of the main valve body, a hollow piston shaft is arranged in the main valve body, the middle part of the piston shaft is convexly provided with an annular flange and is in movable airtight connection with the inside of the main valve body through the annular flange, a spring is arranged between the upper valve body and the annular flange, and a sealing seat is arranged on the lower valve body, so that the bottom of the piston shaft is in sealing fit with the sealing seat under the action of the spring.
Description
Technical Field
The invention relates to the technical field of pneumatic conveying of bulk material pipelines, in particular to a bus-controlled air compensating valve for pneumatic conveying and a control system.
Background
Pneumatic conveying is also called air flow conveying, is a conveying technology for conveying granular materials in an airtight pipeline along the air flow direction by utilizing the energy of air flow, and has wide application in the fields of thermal power, steel, chemical industry, metallurgy and the like. Because of the instability of the characteristics of the conveyed bulk materials or the deviation of the fly ash content of the actual combustion coal and the designed coal, the pneumatic conveying is easy to be unstable, the bulk materials are difficult to convey, the frequent pipe blockage faults occur, and the pipe blockage phenomenon is more obvious during the long-distance conveying.
In order to reduce the blocking of the pipe and increase the stability of the system, the air supplementing technology is mainly used. The air supplementing device connected with the compressed air pipeline is additionally arranged on the material conveying pipeline, so that compressed air is supplemented into the material conveying pipeline when the pipe is blocked, and materials at the pipe blocking position are blown away, and the pipe blocking fault of the conveying pipeline is relieved. At present, the transportation modes adopting the air supplementing technology are as follows: firstly, adopting a double-sleeve pneumatic conveying technology, arranging an auxiliary air pipe right above the conveying pipe, arranging an opening on the auxiliary air pipe at intervals, arranging a throttle plate in the opening, and enabling powder materials to move forwards at a lower speed under the action of conveying air; and secondly, a pure mechanical automatic opening and closing auxiliary blowing valve is adopted, an auxiliary air pipe is additionally arranged outside the conveying pipe, an opening is formed in the auxiliary air pipe at certain intervals and is connected to the mechanical auxiliary blowing valve, the auxiliary blowing valve is connected to the conveying pipe, and when the conveying pipe is blocked, the mechanical auxiliary blowing valve is automatically opened, and when the conveying pipe is unblocked, the conveying pipe is automatically closed. By adopting the mechanical control mode, firstly, because of the pure mechanical equipment, the control accuracy is poor, the valve state cannot be monitored in real time, and the damaged equipment cannot be distinguished and maintained in time; secondly, the pressure of the conveying pipeline and the instantaneous pressure field condition of the whole pipeline cannot be monitored in real time; thirdly, once the design of the system is determined, the system is difficult to adjust, the response speed is slow, the response is delayed greatly, and the practical application range is limited.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide the bus-controlled air compensating valve for pneumatic conveying and the control system, which have compact structure, flexible and changeable control and strong functions, can flexibly control the valve to open and supplement air according to the pressure of a conveying pipeline or a signal on a field bus, dredge the pipeline in time, ensure stable conveying of bulk materials in the pipeline, realize the visualization of the real-time pressure of the conveying pipeline and the visualization of the valve state, and facilitate the overhaul and maintenance of equipment.
In order to achieve the aim, the invention discloses a bus-controlled pneumatic conveying air compensating valve, which comprises a valve body, a display screen, a central control unit, a pressure core body and a miniature electromagnetic valve, wherein the valve body comprises an upper valve body, a main valve body and a lower valve body;
the miniature electromagnetic valve is arranged on the valve body, the upper valve body, the main valve body and the lower valve body are all provided with bypasses communicated with the miniature electromagnetic valve, the miniature electromagnetic valve is electrically connected with the central control unit, the central control unit is in communication connection with the field bus, and the central control unit controls the miniature electromagnetic valve to switch on and off the bypasses of the upper valve body and the main valve body or the bypasses of the main valve body and the lower valve body after acquiring signals of the field bus, so that the bottom of the piston shaft is in sealing fit with the sealing seat;
the display screen and the pressure core body are respectively and electrically connected with the central control unit, the pressure core body is used for detecting the pressure of the pipeline, and the display screen is used for displaying site information, pipeline pressure and valve states.
Preferably, the center of the upper valve body is provided with an air inlet cavity, and the center of the lower valve body is provided with an air outlet cavity, so that the air inlet cavity and the air outlet cavity are communicated through the piston shaft.
Preferably, an upper end cover is arranged between the upper valve body and the main valve body, a spring cavity is formed between the upper end cover and the annular flange in the main valve body, a lower end cover is arranged between the main valve body and the lower valve body, and a driving cavity is formed between the lower end cover and the annular flange in the main valve body.
Preferably, the valve further comprises a base and a shell, wherein the valve body is arranged on the base, the shell is covered on the base, a top plate is arranged on an upper opening of the shell, a top panel is arranged on a top cover of the shell, so that a shell inner cavity is formed in the shell, an air inlet pipe connector is connected to the upper portion of the valve body, and an outlet cavity communicated with an air outlet cavity of the valve body is arranged at the lower portion of the base.
Preferably, the miniature electromagnetic valve is provided with an air supply port, a working port and an air release port, an air inlet is arranged between the main valve body and the upper valve body and is communicated with the air inlet cavity, a driving hole is arranged on the main valve body and is communicated with the driving cavity, an air release hole is arranged between the main valve body and the lower valve body, and the air inlet, the driving hole and the air release hole are respectively communicated with the air supply port, the working port and the air release port of the miniature electromagnetic valve.
Preferably, the base is provided with a base air leakage port communicated with the air leakage hole, so that the air leakage port is communicated with external atmospheric pressure, the base is provided with a shell cavity breathing hole communicated with the shell cavity, so that the shell cavity is communicated with external atmospheric pressure, and the upper part of the main valve body is provided with a spring cavity breathing hole communicated with the spring cavity, so that the spring cavity is communicated with the shell cavity.
Preferably, the upper portion of export chamber is provided with the check valve, one side of export chamber is provided with the mounting hole, the mounting hole with the export chamber is linked together, the pressure core set up in the mounting hole for detect pipeline pressure, the pressure core with the central control unit electricity is connected.
Preferably, the display screen is arranged on the top panel, and a light-transmitting protective plate is arranged on the display screen.
Preferably, a first annular groove is formed in the annular flange of the piston shaft, a piston shaft sealing ring is sleeved on the first annular groove, and the piston shaft sealing ring is connected with the inner wall of the main valve body in an airtight manner;
the inner side surfaces of the upper end cover and the lower end cover are respectively provided with a second annular groove, and an upper end cover sealing ring and a lower end cover sealing ring are respectively sleeved in the second annular grooves and are in airtight connection with the outer wall of the piston shaft through the upper end cover sealing ring and the lower end cover sealing ring;
a third annular groove is formed in the inner side surface of the sealing seat, and a sealing seat sealing ring is sleeved on the third annular groove and is connected with the air inlet cavity in an airtight manner through the sealing seat sealing ring;
the bottom surface of going up the valve body with the upper surface of lower valve body all is provided with fourth annular groove, be provided with valve body sealing washer, lower valve body sealing washer on the fourth annular groove respectively, go up the valve body through go up the valve body sealing washer with the airtight connection of upper end cover, the lower valve body passes through the lower valve body sealing washer with the airtight connection of lower end cover.
Preferably, the invention provides a control system of a pneumatic conveying air supplementing valve controlled by a bus, which comprises an external control unit, a field bus, a compressed air pipe and a conveying pipeline, wherein the field bus is electrically connected with the external control unit, a cable connector is electrically connected with the field bus, the central control unit is in communication connection with the external control unit through the cable connector, an air inlet pipe is connected between the compressed air pipe and an air inlet pipe joint of the air supplementing valve, and an air outlet pipe is connected between the conveying pipeline and an outlet cavity of the air supplementing valve.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the central control unit, the miniature electromagnetic valve, the pressure core body and the mechanical parts are integrated into a small space to form an independent pneumatic control valve, so that the function of the air compensating valve is more powerful, the valve can be flexibly controlled to compensate air according to the pressure of a conveying pipeline or a signal on a field bus, the pipeline can be dredged timely, stable conveying of bulk materials in the pipeline is ensured, the visualization of the real-time pressure of the conveying pipeline and the visualization of the valve state can be realized, and the overhaul and maintenance of equipment are facilitated. Due to the participation of the electrical components, the control mode is flexible, the pressure sensing is accurate and sensitive, the action response speed is high, meanwhile, the change of the property of conveying bulk materials can be dealt with, the action parameters can be adjusted at any time, the stable operation of a bulk material conveying system is ensured, the reliability can be greatly improved, the conveying pressure of a pipeline is effectively controlled, the abrasion is reduced, the operation cost is reduced, and the system benefit is improved.
Drawings
FIG. 1 is a top view of a bus controlled air make-up valve;
FIG. 2 is a semi-sectional view I of a bus controlled air make-up valve;
FIG. 3 is a semi-sectional view I of a bus controlled air make-up valve;
FIG. 4 is a schematic diagram of the installation and use of a bus controlled air make-up valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Referring to fig. 2 and 3, a bus-controlled air supply valve 20 for pneumatic transmission comprises a valve body, a base 5.0, a housing 5.1, a display screen 6, a central control unit 7, a pressure core 8 and a miniature electromagnetic valve 9;
referring to fig. 2, the valve body is disposed on the base 5.0, the housing 5.1 is disposed on the base 5.0, a top plate 5.2 is disposed on an upper opening cover of the housing 5.1, a top plate 5.3 is fixedly disposed on the top plate, a housing cavity 3.5 is formed in the housing 5.1, an air inlet pipe joint 5.5 is connected to an upper portion of the valve body, and an outlet cavity 3.4 is disposed at a lower portion of the base 5.0.
The valve body comprises an upper valve body 1.0, a main valve body 1.2 and a lower valve body 1.7, wherein the upper valve body 1.0 is arranged at the top of the main valve body 1.2, the lower valve body 1.7 is arranged at the bottom of the main valve body 1.2, a hollow piston shaft 1.4 is arranged in the main valve body 1.2, an annular flange is convexly arranged in the middle of the piston shaft 1.4 and is in movable airtight connection with the inside of the main valve body 1.2 through the annular flange, an upper end cover 1.1 is arranged between the upper valve body 1.0 and the main valve body 1.2, a spring cavity 3.1 is formed between the upper end cover 1.1 and the annular flange in the inside of the main valve body 1.2, a lower end cover 1.5 is arranged between the lower end cover 1.5 and the annular flange in the inside of the main valve body 1.2, and a driving cavity 3.2 is formed between the upper part of the piston shaft 1.4 and the annular flange, and the upper part of the piston shaft 1.4 is sleeved with a spring 1.3, so that the bottom of the piston shaft 1.4 is in sealing fit with a sealing seat 1.6 under the action of the spring 1.3.
Referring to fig. 2 and 3, the micro electromagnetic valve 9 is disposed on the valve body and is electrically connected with the central control unit, the upper valve body 1.0, the main valve body 1.2 and the lower valve body 1.7 are all provided with bypasses communicated with the micro electromagnetic valve 9, the center of the upper valve body 1.0 is provided with an air inlet cavity 3.0, the center of the lower valve body 1.7 is provided with an air outlet cavity 3.3, because the piston shaft 1.4 is of a hollow structure, the air inlet cavity 3.0 and the air outlet cavity 3.3 are communicated through the piston shaft, the micro electromagnetic valve 9 in this embodiment is in a two-position three-way structure, and is respectively provided with an air supply port P, a working port a and an air release port R, wherein an air inlet 4.2 is disposed between the main valve body 1.2 and the upper valve body 1.0 and is communicated with the air inlet cavity 3.0 (a bypass of the upper valve body), a driving hole 4.3 is disposed on the main valve body 1.2 and is communicated with the driving cavity 3.2 (a bypass of the main valve body), an air release hole 4.4 (a bypass of the lower valve body) is disposed between the main valve body 1.2 and the lower valve body 1.7, a base 5.0 is provided with an air release hole 4.4 (a bypass of the lower valve body) and is communicated with the air inlet 4.4.4, and the air supply port 4 is communicated with the air inlet 4.4 and the air release port 4.
The base 5.0 is provided with a shell cavity breathing hole 4.1 communicated with the shell cavity 3.5, so that the inside of the shell cavity 3.5 is communicated with the outside, and the upper part of the main valve body 1.2 is provided with a spring cavity breathing hole 4.0 communicated with the spring cavity 3.1, so that the spring cavity 3.1 is communicated with the shell cavity 3.5.
Referring to fig. 2 and 3, a first annular groove is formed in an annular flange of the piston shaft 1.4, a piston shaft sealing ring 2.3 is sleeved on the first annular groove, and the piston shaft sealing ring 2.3 is in airtight connection with the inner wall of the main valve body 1.2; the inner sides of the upper end cover 1.1 and the lower end cover 1.5 are respectively provided with a second annular groove, an upper end cover sealing ring 2.2 and a lower end cover sealing ring 2.4 are respectively sleeved in the second annular grooves, and the second annular grooves are connected with the outer wall of the piston shaft 1.4 in an airtight manner through the upper end cover sealing ring 2.2 and the lower end cover sealing ring 2.4; the outer wall of the sealing seat 1.6 is provided with a third annular groove, the third annular groove is sleeved with a sealing seat sealing ring 2.6, and the sealing seat sealing ring 2.6 is connected with the air inlet cavity in an airtight manner; the bottom surface of upper valve body 1.0 and the upper surface of lower valve body 1.7 all are provided with fourth annular groove, be provided with upper valve body sealing washer 2.1 on the fourth annular groove respectively, upper valve body 1.0 is connected with upper end cover 1.1 airtight through upper valve body sealing washer 2.1, lower valve body 1.7 is connected with lower end cover 1.5 airtight through lower valve body sealing washer 2.7, the outer wall of lower end cover 1.5 is provided with the fifth recess, be provided with lower end cover sealing washer II2.5 on the fifth recess, the lower end cover is connected with the inner wall of main valve body 1.2 airtight through lower end cover sealing washer II2.5, the upper surface of upper valve body 1.0 is provided with the sixth recess, be provided with upper valve body sealing washer II2.0 on the sixth recess, upper valve body 1.0 is connected with top surface board 5.3 airtight through upper valve body sealing washer II2.0, the upper surface of base 5.0 is provided with seventh recess, be provided with lower sealing washer II2.8 on the seventh recess, base 5.0 is connected with the inner wall of base 1.7 airtight through lower valve body sealing washer II2.8, the base 2.0 is provided with the base 9.9, the side check valve is connected with the check valve body 2.0 airtight groove through the check valve groove.
According to the invention, through the airtight connection mode, the sealing performance of the interior of the valve body is enhanced, and the bulk material conveying is more stable.
Referring to fig. 1 and 2, a check valve 11 is disposed at the upper part of an outlet cavity 3.4 of the base 5.0, a mounting hole is disposed at one side of the outlet cavity 3.4, the mounting hole is communicated with the outlet cavity 3.4, a pressure core 8 is disposed in the mounting hole and is used for checking the pressure in a pipeline, the pressure core 8 is electrically connected with a central control unit, in this embodiment, a pressure sensor of a diffused silicon type is preferably adopted for the pressure core 8, and chip data processing is realized on the central control unit 7.
The display screen 6 is arranged on the top panel, and the display screen 6 is electrically connected with the central control unit 7, and the upper part of the display screen 6 is provided with the light-transmitting protective plate 5.4, and site information, pipeline pressure and valve states are displayed through the display screen 6.
The base 5.0 is provided with cable connectors 10, the cable connectors 10 being electrically connected to the central control unit 7.
Referring to fig. 2 and 4, the present invention further provides a bus-controlled air supply valve for pneumatic transmission and a control system, which comprises an external control unit 21, a field bus 22, a compressed air pipe 24, and a transmission pipe 25, wherein the field bus 22 is electrically connected with the external control unit 21, the cable connector 10 is electrically connected with the field bus 22 (in this embodiment, the field bus may use two cables, one for supplying power and the other for communication, and one cable is required to have both power supply and communication functions), while the central control unit 7 is communicatively connected with the external control unit 21 through the cable connector 10, therefore, the central control unit 7 of the present invention has the field bus 22 communication function, and as a slave station, may use the field bus 22 to communicate with the external control unit 21, and in this embodiment, the field bus preferably uses RS485 or CAN related communication protocol, when the external control unit 21 controls the air compensating valve 20 not to be connected with the field bus, the air compensating valve 20 CAN be independently operated in an offline mode, at the moment, the air compensating valve 20 is in an offline mode according to the preset working mode of the central control unit 7, when the air compensating valve 22 is not connected, only the air compensating valve 20 is required to be powered, no communication line is required to be connected, a branch point 23 is arranged on the compressed air pipe 24 and the field bus 22 at a certain distance, an air inlet pipe is led out of the branch point 23 and connected to an air inlet pipe joint 5.5 of the air compensating valve 20, a cable is led out of the branch point 23 and connected to a cable connector 10 of the air compensating valve 20, an air outlet pipe is connected between an outlet cavity 3.4 of the air compensating valve 20 and a conveying pipeline 25, the air compensating valve 20 is used as a slave station, a pressure signal of the conveying pipeline 25 is read in real time through a pressure core 8 of the air compensating valve 20 and is forwarded to the field bus 22, the external control unit 21 reads the pressure signal of the air compensating valve 20 through the field bus 22, analyzing and sending a valve opening and closing instruction, after receiving a signal of the external control unit 21, the air compensating valve 20 drives the valve to act, and when the external control unit 21 is in a monitoring-only mode or the field bus 22 fails, the air compensating valve 20 calculates according to a preset working mode on the central control unit 7 and sends the valve opening and closing instruction to drive the micro electromagnetic valve 9 to act.
The main control modes include: (1) When the pressure of the conveying pipeline is lower than a pressure set value, the air compensating valve is opened, and when the pressure of the conveying pipeline is higher than the pressure set value, the air compensating valve is closed; (2) When the pressure of the conveying pipeline is higher than a pressure set value, the air compensating valve is opened, and when the pressure of the conveying pipeline is lower than the pressure set value, the conveying pipeline is closed; (3) When the pressure of the conveying pipeline is within a set range, the air compensating valve is opened, otherwise, the air compensating valve is closed; (4) When the pressure of the conveying pipeline is within the range of the set interval, the air compensating valve is closed, otherwise, the air compensating valve is opened; (5) Forcing the air compensating valve of the individual station to open or close for a long time without being connected with the pressure of the pipeline; when the air compensating valve is opened, a pulse injection type or a normally open type is adopted. The control modes of all stations on one field bus can be different, the control mode of the air supplementing valve is flexible and changeable, the customization by a program is realized, the operation by the bus is realized, the timely adjustment of conveying parameters, the quick response and the stable operation of a conveying system can be ensured.
Because bus control is adopted, the wiring of the system is greatly simplified, and the field bus networking technology of the external control unit 21 and the air compensating valve 20 ensures that the control is very flexible and can be completely customized according to the logic of the external control unit.
Referring to fig. 2 to 4, the specific working principle of the air compensating valve of the invention is as follows:
the external control unit 21 reads the pressure signal of the air compensating valve 20 through the field bus 22, analyzes the pressure signal and sends out an opening and closing instruction of the miniature electromagnetic valve 9, and the air compensating valve 20 receives the signal sent by the external control unit 21 and then controls the valve to act.
When the miniature electromagnetic valve 9 enters a closed state, the air supply port P of the miniature electromagnetic valve 9 is cut off, the working port A is communicated with the air discharge port R, at the moment, the driving cavity 3.2 is communicated with external atmospheric pressure through the driving hole 4.3, the working port A of the miniature electromagnetic valve 9, the air discharge port R of the miniature electromagnetic valve 9, the air discharge hole 4.4 and the base air discharge hole 4.5, the driving cavity 3.2 is in an atmospheric pressure state, under the action of the elasticity of the spring 1.3, the piston shaft 1.4 moves towards the direction of the sealing seat 1.6, the sealing seat 1.6 is in sealing fit with the bottom of the piston shaft 1.4, and therefore the communication between the air inlet cavity 3.0 and the air outlet cavity 3.3 is blocked through the sealing seat 1.6, and therefore, the valve of the air compensating valve 20 is in the closed state, and compressed air of the compressed air pipe 24 cannot enter the air outlet cavity 3.3 through the air inlet cavity 3.0.
When the miniature electromagnetic valve 9 enters an open state, the air leakage port R of the miniature electromagnetic valve 9 is cut off, the air supply port P is communicated with the working port A, compressed air in the air inlet cavity 3.0 enters the driving cavity 3.2 through the air inlet hole 4.2, the air supply port P of the miniature electromagnetic valve 9, the working port A of the miniature electromagnetic valve 9 and the driving hole 4.3, and the pressure in the driving cavity 3.2 is continuously increased, so that the piston shaft 1.4 is pushed to move away from the sealing seat 1.6, the air inlet cavity 3.0 is communicated with the air outlet cavity 3.3, compressed air in the air inlet cavity 3.0 enters the air outlet cavity 3.3, and the compressed air pushes the check valve 11 to enter the air outlet cavity 3.4 to supplement the conveying pipeline 25.
When the miniature electromagnetic valve 9 is in a closed state, the spring 1.3 is in a precompressed state, the air compensating valve 20 is kept in a closed state, and when the miniature electromagnetic valve 9 is opened, the spring 1.3 is continuously compressed, and the air compensating valve 20 is kept in an opened state because the thrust of the spring 1.3 is smaller than the upward thrust of compressed air to the piston shaft 1.4 in the driving cavity 3.2.
In this embodiment, the sealing seat 1.6 may be removed, the fixing hole of the sealing seat 1.6 is reserved, a small amount of air supplementing may be performed on the conveying pipeline 25 when the micro electromagnetic valve 9 is closed, the size of the air supplementing may be adjusted according to the diameter of the fixing hole, when the micro electromagnetic valve 9 is opened, the piston shaft 1.4 moves towards the valve body 1.0 direction, the compressed air performs a large amount of air supplementing on the conveying pipeline 25, and particles in the conveying pipeline 25 may be effectively prevented from entering the valve body or the compressed air pipe through the check valve 11, thereby affecting the action of the air supplementing valve.
The above embodiments are only for illustrating the technical concept and features of the present invention, and therefore, it is intended that the present invention can be understood by those skilled in the art and implemented according to the technical concept, and the present invention is not limited to the above embodiments, but modifications made according to the spirit and scope of the main technical solution of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a bus-controlled pneumatic conveying air compensating valve, its characterized in that includes valve body, display screen, central control unit, pressure core, miniature solenoid valve, base, casing, the valve body includes upper valve body, main valve body, lower valve body, upper valve body set up in the top of main valve body, lower valve body set up in the bottom of main valve body, be provided with hollow piston shaft in the main valve body, just the middle part protrusion of piston shaft is provided with annular flange, and through annular flange with the inside movable airtight connection of main valve body, be provided with the spring between upper valve body and the annular flange, be provided with the sealing seat on the lower valve body, make the bottom of piston shaft under the effect of spring with sealing seat sealing fit;
the miniature electromagnetic valve is arranged on the valve body, the upper valve body, the main valve body and the lower valve body are all provided with bypasses communicated with the miniature electromagnetic valve, the miniature electromagnetic valve is electrically connected with the central control unit, the central control unit is in communication connection with the field bus, and the central control unit controls the miniature electromagnetic valve to switch on and off the bypasses of the upper valve body and the main valve body or the bypasses of the main valve body and the lower valve body after acquiring signals of the field bus, so that the bottom of the piston shaft is in sealing fit with the sealing seat; the center of the upper valve body is provided with an air inlet cavity, and the center of the lower valve body is provided with an air outlet cavity, so that the air inlet cavity is communicated with the air outlet cavity through the piston shaft;
an upper end cover is arranged between the upper valve body and the main valve body, a spring cavity is formed between the upper end cover and the annular flange in the main valve body, a lower end cover is arranged between the main valve body and the lower valve body, and a driving cavity is formed between the lower end cover and the annular flange in the main valve body;
the valve body is arranged on the base, the shell is covered on the base, a top plate is arranged at the upper opening of the shell, a top panel is arranged at the top cover of the shell, so that a shell inner cavity is formed in the shell, the upper part of the valve body is connected with an air inlet pipe joint, and an outlet cavity communicated with the air outlet cavity of the valve body is arranged at the lower part of the base;
the miniature electromagnetic valve is provided with an air supply port, a working port and an air leakage port, an air inlet hole is arranged between the main valve body and the upper valve body and is communicated with the air inlet cavity, a driving hole is arranged on the main valve body and is communicated with the driving cavity, an air leakage hole is arranged between the main valve body and the lower valve body, and the air inlet hole, the driving hole and the air leakage hole are respectively communicated with the air supply port, the working port and the air leakage port of the miniature electromagnetic valve;
the display screen and the pressure core body are respectively and electrically connected with the central control unit, the pressure core body is used for detecting the pressure of the pipeline, and the display screen is used for displaying site information, pipeline pressure and valve states.
2. The bus-controlled air supply valve for pneumatic conveying according to claim 1, wherein a base air release port communicated with the air release hole is arranged on the base, the air release port is communicated with the external atmosphere, a shell cavity breathing hole communicated with the shell cavity is arranged on the base, the shell cavity is communicated with the external atmosphere, and a spring cavity breathing hole communicated with the spring cavity is arranged on the upper portion of the main valve body, so that the spring cavity is communicated with the shell cavity.
3. The bus-controlled air supply valve for pneumatic conveying according to claim 1, wherein a check valve is arranged at the upper part of the outlet chamber, a mounting hole is arranged at one side of the outlet chamber, the mounting hole is communicated with the outlet chamber, the pressure core is arranged in the mounting hole and used for detecting pipeline pressure, and the pressure core is electrically connected with the central control unit.
4. The bus-controlled air supply valve for pneumatic conveying according to claim 1, wherein the display screen is provided on the top panel, and a light-transmitting protective plate is provided on the display screen.
5. The bus-controlled air supply valve for pneumatic conveying according to claim 1, wherein a first annular groove is formed in an annular flange of the piston shaft, a piston shaft sealing ring is sleeved on the first annular groove, and the piston shaft sealing ring is in airtight connection with the inner wall of the main valve body;
the inner side surfaces of the upper end cover and the lower end cover are respectively provided with a second annular groove, and an upper end cover sealing ring and a lower end cover sealing ring are respectively sleeved in the second annular grooves and are in airtight connection with the outer wall of the piston shaft through the upper end cover sealing ring and the lower end cover sealing ring;
a third annular groove is formed in the inner side surface of the sealing seat, and a sealing seat sealing ring is sleeved on the third annular groove and is connected with the air inlet cavity in an airtight manner through the sealing seat sealing ring;
the bottom surface of going up the valve body with the upper surface of lower valve body all is provided with fourth annular groove, be provided with valve body sealing washer, lower valve body sealing washer on the fourth annular groove respectively, go up the valve body through go up the valve body sealing washer with the airtight connection of upper end cover, the lower valve body passes through the lower valve body sealing washer with the airtight connection of lower end cover.
6. A control system for a make-up valve for a bus controlled pneumatic conveying according to any one of claims 1 to 4, comprising an external control unit, a field bus electrically connected to the external control unit, a cable connector electrically connected to the field bus, a central control unit communicatively connected to the external control unit via the cable connector, an air inlet pipe connected between the compressed air pipe and an air inlet pipe joint of the make-up valve, and an air outlet pipe connected between the delivery pipe and an outlet chamber of the make-up valve.
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| JPH0510334U (en) * | 1991-05-02 | 1993-02-09 | 日立プラント建設株式会社 | Pneumatic transportation device for powder |
| CN203255742U (en) * | 2013-04-03 | 2013-10-30 | 马莉 | Novel gulp valve for pneumatic transmission |
| CN104097951A (en) * | 2013-04-03 | 2014-10-15 | 马莉 | Pneumatic conveying air replenishment valve of automatic impulse suction |
| CN109915379A (en) * | 2019-04-12 | 2019-06-21 | 南通市红星空压机配件制造有限公司 | Normally open type air inlet valve |
| CN212387310U (en) * | 2020-05-18 | 2021-01-22 | 浙江唯拓环保设备有限公司 | Intelligent air supplement device |
| CN112797206A (en) * | 2021-01-29 | 2021-05-14 | 陈宇雄 | Automatic pipeline adjusting and air supplementing valve and air supplementing system |
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2021
- 2021-12-30 CN CN202111681096.9A patent/CN114352795B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0510334U (en) * | 1991-05-02 | 1993-02-09 | 日立プラント建設株式会社 | Pneumatic transportation device for powder |
| CN203255742U (en) * | 2013-04-03 | 2013-10-30 | 马莉 | Novel gulp valve for pneumatic transmission |
| CN104097951A (en) * | 2013-04-03 | 2014-10-15 | 马莉 | Pneumatic conveying air replenishment valve of automatic impulse suction |
| CN109915379A (en) * | 2019-04-12 | 2019-06-21 | 南通市红星空压机配件制造有限公司 | Normally open type air inlet valve |
| CN212387310U (en) * | 2020-05-18 | 2021-01-22 | 浙江唯拓环保设备有限公司 | Intelligent air supplement device |
| CN112797206A (en) * | 2021-01-29 | 2021-05-14 | 陈宇雄 | Automatic pipeline adjusting and air supplementing valve and air supplementing system |
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| CN114352795A (en) | 2022-04-15 |
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