CN111237278A - Pilot-operated open-loop control proportional flow valve - Google Patents
Pilot-operated open-loop control proportional flow valve Download PDFInfo
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- CN111237278A CN111237278A CN202010199378.4A CN202010199378A CN111237278A CN 111237278 A CN111237278 A CN 111237278A CN 202010199378 A CN202010199378 A CN 202010199378A CN 111237278 A CN111237278 A CN 111237278A
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- valve
- pilot
- port
- main valve
- control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
Abstract
The invention relates to a pilot type open-loop control proportional flow valve, which comprises a pilot valve and a main valve which are communicated, wherein the pilot valve comprises a controller and a pilot valve module; the main valve comprises a valve body, a valve core, a left end cover, a right end cover and a spring; a pilot valve control port of the pilot valve is communicated with a main valve control port of the main valve, and the main valve control port of the main valve is communicated with a right control cavity of the main valve; the pressure of a pilot valve control port of the pilot valve is in a first nonlinear characteristic relation with an input signal, the pressure of a main valve control port of the main valve is in a linear relation with the opening degree of a valve port of the main valve, and the opening degree of the valve port of the main valve is in a second nonlinear characteristic relation with the output gas flow; through laboratory tests, the output gas flow and the input signal are corrected to form a linear relation, and the pressure value of the control port of the intermediate variable pilot valve is solidified into the controller. The advantages are that: reasonable structure, is suitable for controlling the gas flow and is accurate to control.
Description
Technical Field
The invention relates to the technical field of gas flow control, in particular to a pilot type open-loop control proportional flow valve.
Background
The flow rate of the fluids (gas and liquid) is constant at the external conditions (pressure and temperature, etc.). Generally related to the size of the cross-section of the space through which the fluid flows. For a specific flow valve, the opening degree of the valve port is controlled to realize the output of a flow value with a required size.
By proportional flow valve is meant that the flow output of a control valve is linear with the value of the input signal (current or voltage) applied to it. The pilot control valve is a valve in which the movement of the spool of the main valve is controlled by the output pressure of the pilot valve.
The pilot valve is generally a microminiature direct-acting proportional pressure valve. The direct-acting proportional pressure valve generally comprises a control circuit, an electromechanical converter and a control valve core. The control mechanism is that input electric signal (voltage/current) is input to a control circuit, after the signal is amplified, the signal is input to an electromechanical converter to output mechanical displacement, and the displacement forms the opening degree of a valve port to control the output pressure value. This pressure value is typically proportional to the input electrical signal.
The control pressure of pilot valve is led into control cavity in main valve to control the movement of main valve core, and the valve core can output a displacement (valve port opening) which is linear relation with pressure by means of valve core spring system.
For liquid, the opening degree of the valve port and the flow rate can be approximately considered as proportional relation in a certain flow rate range. Therefore, the hydraulic control device has wide application in the field of hydraulic control and good effect.
However, due to the large difference in physical properties of gases and liquids, liquids are generally considered incompressible fluids, whereas gases, obviously, are compressible fluids. The flow rate of gas flowing through the valve port is in a nonlinear relationship with the opening degree of the valve port. Thus, the flow of gas cannot be proportional to the input signal.
With the in-depth development of the industrial 4.0 technology, the pneumatic technology called industrial automation muscle is changed. The pneumatic proportional technology is beginning to enter the field of pneumatic control to meet the requirements of the industry in the 4.0 era on the flexibility and the programmability of the state of a control object. The pilot open-loop control proportional flow valve is a new product designed for the requirement.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a pilot type open-loop control proportional flow valve which is reasonable in structure, suitable for gas flow control and accurate in control.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a pilot type open-loop control proportional flow valve comprises a pilot valve and a main valve which are communicated, wherein the pilot valve is provided with a pilot valve air inlet, a pilot valve pressure relief opening and a pilot valve control opening, and comprises a controller and a pilot valve module; the main valve is provided with a main valve air supply port, a main valve exhaust port, a main valve control port, a working port and a pilot valve interface, and comprises a valve body, a valve core, a left end cover, a right end cover and a spring, wherein the spring is arranged between the valve core and the left end cover; a pilot valve control port of the pilot valve is communicated with a main valve control port of the main valve, and the main valve control port of the main valve is communicated with a right control cavity of the main valve;
the pressure of a pilot valve control port of the pilot valve is in a first nonlinear characteristic relation with an input signal, the pressure of a main valve control port of the main valve is in a linear relation with the opening degree of a valve port of the main valve, and the opening degree of the valve port of the main valve is in a second nonlinear characteristic relation with the output gas flow; through laboratory tests, the output gas flow and the input signal are corrected to form a linear relation, and the pressure value of the control port of the intermediate variable pilot valve is solidified into the controller.
The optimized technical measures further comprise:
foretell pilot valve module is including the solenoid valve that admits air, exhaust solenoid valve, pressure sensor and gas circuit bottom plate, the controller with the solenoid valve that admits air, exhaust solenoid valve control is connected, pressure sensor feedback is connected in the controller, the solenoid valve that admits air sets up between pilot valve air inlet and pilot valve control mouth, exhaust solenoid valve sets up between pilot valve pressure release mouth and pilot valve control mouth.
The controller comprises a processor, an M/A analog-to-digital converter, an input/output interface circuit, a display circuit, a power supply and an electromagnetic valve driving circuit.
The left end of the right end cover is provided with a convex block, and a right control cavity is formed between the periphery of the convex block and the inner wall of the valve body.
The middle part of the valve core is provided with a groove.
And a sealing ring is arranged between the right end cover and the valve body.
The right end cover and the valve body are fixed through screws.
And an outer housing is arranged outside the controller and the pilot valve module.
The invention relates to a pilot type open-loop control proportional flow valve which is reasonable in structure and comprises a pilot valve and a main valve, wherein the pressure of a pilot valve control port of the pilot valve is in a first nonlinear characteristic relation with an input signal, the pressure of a main valve control port of the main valve is in a linear relation with the opening degree of a valve port of the main valve, and the opening degree of the valve port of the main valve is in a second nonlinear characteristic relation with the output gas flow; through laboratory tests, the output gas flow and the input signal are corrected to form a linear relation, and the pressure value of the control port of the intermediate variable pilot valve is solidified into a controller; therefore, the linear relation between the main valve flow and the input signal is realized, the proportional control of the flow is realized, and the proportional control valve is suitable for a gas flow environment and can accurately control the flow.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the pilot valve of FIG. 1 with the outer casing removed;
FIG. 3 is a bottom view of the pilot valve of FIG. 1;
FIG. 4 is a control schematic of the pilot valve of the present invention;
FIG. 5 is a schematic diagram of the controller of FIG. 4;
FIG. 6 is a schematic representation of the construction of the main valve of the present invention;
FIG. 7 is a top view of the main valve of the present invention;
fig. 8 is a control schematic of the proportional flow valve of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 to 8, which are schematic structural views of the present invention,
wherein the reference numerals are: a first nonlinear characteristic relationship L1, a linear relationship L2, a second nonlinear characteristic relationship L3, a pilot valve air inlet P1, a pilot valve pressure relief port R1, a pilot valve control port K1, a main valve air supply port P2, a main valve exhaust port R2, a main valve control port K2, a working port a, a pilot valve 1, a controller 11, a processor 11a, an M/a analog-to-digital converter 11b, an input/output interface circuit 11c, a display circuit 11d, a power supply 11e, a solenoid valve drive circuit 11f, a pilot valve module 12, an air intake solenoid valve 12a, an exhaust solenoid valve 12b, a pressure sensor 12c, an air passage bottom plate 12d, an outer cover 13, a main valve 2, a pilot valve interface 2a, a right control chamber 2b, a valve body 21, a valve core 22, a groove 22a, a left end cover 23, a right end cover 24, a bump 24a, a spring 25, a.
As shown in figures 1 to 8 of the drawings,
a pilot type open-loop control proportional flow valve comprises a pilot valve 1 and a main valve 2 which are communicated, wherein the pilot valve 1 is provided with a pilot valve air inlet P1, a pilot valve pressure relief port R1 and a pilot valve control port K1, and the pilot valve 1 comprises a controller 11 and a pilot valve module 12; the main valve 2 is provided with a main valve air supply port P2, a main valve exhaust port R2, a main valve control port K2, a working port A and a pilot valve interface 2a, the main valve 2 comprises a valve body 21, a valve core 22, a left end cover 23, a right end cover 24 and a spring 25, and the spring 25 is arranged between the valve core 22 and the left end cover 23; a pilot valve control port K1 of the pilot valve 1 is communicated with a main valve control port K2 of the main valve 2, and a main valve control port K2 of the main valve 2 is communicated with a right control cavity 2b of the main valve 2;
the pressure of the pilot valve control port K1 of the pilot valve 1 and the input signal are in a first nonlinear characteristic relation L1, the pressure of the main valve control port K2 of the main valve 2 and the valve port opening degree of the main valve 2 are in a linear relation L2, and the valve port opening degree of the main valve 2 and the output gas flow are in a second nonlinear characteristic relation L3; through laboratory testing, the output gas flow and input signal are corrected to a linear relationship and the pressure value of the intermediate variable pilot valve control port K1 is consolidated into the controller 11.
In an embodiment, the pilot valve module 12 includes an air intake solenoid valve 12a, an exhaust solenoid valve 12b, a pressure sensor 12c and an air circuit bottom plate 12d, the controller 11 is connected to the air intake solenoid valve 12a and the exhaust solenoid valve 12b in a control manner, the pressure sensor 12c is connected to the controller 11 in a feedback manner, the air intake solenoid valve 12a is disposed between the pilot valve air inlet P1 and the pilot valve control port K1, and the exhaust solenoid valve 12b is disposed between the pilot valve pressure relief port R1 and the pilot valve control port K1.
In the embodiment, the controller 11 includes a processor 11a, an M/a analog-to-digital converter 11b, an input/output interface circuit 11c, a display circuit 11d, a power supply 11e, and a solenoid valve driving circuit 11 f.
In the embodiment, the left end of the right end cover 24 is provided with a projection 24a, and a right control chamber 2b is formed between the outer periphery of the projection 24a and the inner wall of the valve body 21.
In the embodiment, the center portion of the spool 22 is provided with a groove 22 a. The notch 22a is located at the main valve supply port P2.
In the embodiment, a seal ring 26 is provided between the right end cover 24 and the valve body 21.
In the embodiment, the right end cover 24 and the valve body 21 are fixed by screws 27.
In the embodiment, the controller 11 and the pilot valve module 12 are externally provided with an outer casing 13.
The working principle is as follows:
the pilot type open-loop control proportional flow valve is composed of a pilot valve 1 and a main valve 2 which are communicated, wherein the pilot valve 1 is provided with a pilot valve air inlet P1, a pilot valve pressure relief port R1 and a pilot valve control port K1, the main valve 2 is provided with a main valve air supply port P2, a main valve exhaust port R2, a main valve control port K2, a working port A and a pilot valve interface 2a, and 3 ports (shown in figure 7) of the pilot valve interface 2a are correspondingly connected with the pilot valve air inlet P1, the pilot valve pressure relief port R1 and the pilot valve control port K1 on the pilot valve 1. The pilot valve control port K1 communicates with the main valve control port K2, that is, the pilot valve control port K1 is at the same pressure as the main valve control port K2.
As shown in fig. 4, the input signal sets the output pressure value of the pilot valve 1, and the pressure sensor 12c detects the real pressure output by the pilot valve and feeds the real pressure back to the controller 11. After logical operation, the controller 11 issues an operation command to the solenoid valves (the intake solenoid valve 12a and the exhaust solenoid valve 12 b): when the feedback pressure is greater than the set pressure, the air inlet electromagnetic valve 12a is closed, the air outlet electromagnetic valve 12b is opened, the air in the pilot valve control port K1 is exhausted outwards from the pilot valve pressure relief port R1 through the air outlet electromagnetic valve 12b, and the pressure of the pilot valve control port K1 is reduced; on the contrary, when the feedback pressure is smaller than the set pressure, the intake solenoid valve 12a is opened, the exhaust solenoid valve 12b is closed, the pilot valve intake port P1 supplies air to the pilot valve control port K1 through the intake solenoid valve 12a, and the pressure of the pilot valve control port K1 rises. When the feedback pressure is equal to the set pressure, the intake solenoid valve 12a and the exhaust solenoid valve 12b are closed, and at this time, the pressure of the pilot valve control port K1 is dynamically stabilized within the accuracy range allowed by the set pressure, so that the correlation between the pressure of the pilot valve control port K1 and the input signal is established. The pressure of the pilot valve control port K1 and the input signal have a first nonlinear characteristic relation L1.
As shown in fig. 6, the pilot valve control port K1 of the pilot valve 1 communicates with the main valve control port K2 of the main valve 2, and the pressures of both are equal, the main valve control port K2 communicates with the right control chamber 2b of the main valve 2, and the pressure of the right control chamber 2b is used to control the movement of the spool 22 of the main valve 2. The force of the pressure of the right control chamber 2b acting on the valve core 22 is balanced with the spring force of the left end of the valve core 22, so that the valve core 22 stays at a certain position, thereby controlling the opening of the valve port and controlling the flow of the gas. For a certain pressure of the main valve control port K2, a stable opening of the valve port is obtained, and a stable gas flow can be obtained. Thus, a correlation is established between the pressure at the main valve control port K2 and the gas flow rate at the main valve. As shown in fig. 8, in the main valve 2, although the elastic force of the spring 25 and the amount of compression of the spring are in a linear relationship L2, the opening degree of the valve port and the gas flow rate are in a nonlinear relationship due to the gas characteristics, that is, the opening degree of the valve port and the gas flow rate are in a second nonlinear characteristic relationship L3. That is, in the main valve 2, the pressure of the main valve control port K2 of the main valve 2 and the flow rate of the main valve 2 have a nonlinear relationship.
By introducing an intermediate variable, the pressure of the control port, a correlation is established between the output gas flow of the main valve 2 and the input signal. Through the test in a laboratory, the relation between the flow of the main valve and the input signal is corrected into a linear relation, and the data of the output control pressure value of the corresponding intermediate variable-pilot valve is solidified into a controller; in this way, proportional control of the gas flow is achieved.
The control principle of the present proportional flow valve is shown in fig. 8:
an input signal I is input to the controller 11 of the pilot valve 1 to set an output pressure value of the pilot valve 1, and in the pilot valve 1, a specific functional relationship (i.e., a first nonlinear characteristic relationship L1) is established between the input signal I and an output variable P (control port pressure). The output variable P of the pilot valve 1 is used as an input variable P ' of the main valve 2, and in the main valve 2, the input variable P ' outputs a variable, that is, a displacement X of the spool 22 by a spring system, and the displacement X of the spool 22 and the input variable P ' have a linear relationship (that is, a linear relationship L2). The displacement X of the valve body 22 corresponds to the opening degree of the valve port, and there is a functional relationship (i.e., a second nonlinear characteristic relationship L3) between the opening degree of the valve port and the output flow Q. The functional relation between the opening degree of the valve port and the output flow Q is inherent to the valve structure, the valve structure has a nonlinear relation, and specific values of the functional relation can be obtained through testing in a laboratory.
The relationship from the input signal I to the output flow Q is established in the above way, and the whole relationship chain includes 2 sets of non-linear relationship (the first non-linear characteristic relationship L1 and the second non-linear characteristic relationship L3) and one set of linear relationship (the linear relationship L2), wherein the linear relationship L2 is determined by the spring characteristic, and the second non-linear characteristic relationship L3 can be obtained by testing in the laboratory. By superimposing the first nonlinear characteristic relationship L1, the linear relationship L2, and the second nonlinear characteristic relationship L3, the linear relationship between the input signal I and the output flow Q can be artificially established by laboratory tests. Thereby obtaining a specific function of the first nonlinear characteristic relation L1 and solidifying the function into the embedded software of the pilot valve 1. Therefore, the proportional control of the flow is realized, and the proportional valve which is suitable for the gas environment and can accurately control the flow is realized.
While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by one skilled in the art without departing from the scope of the invention.
Claims (8)
1. A pilot type open-loop control proportional flow valve comprises a pilot valve (1) and a main valve (2) which are communicated, and is characterized in that the pilot valve (1) is provided with a pilot valve air inlet (P1), a pilot valve pressure relief opening (R1) and a pilot valve control opening (K1), and the pilot valve (1) comprises a controller (11) and a pilot valve module (12); the main valve (2) is provided with a main valve air supply port (P2), a main valve exhaust port (R2), a main valve control port (K2), a working port (A) and a pilot valve interface (2a), the main valve (2) comprises a valve body (21), a valve core (22), a left end cover (23), a right end cover (24) and a spring (25), and the spring (25) is arranged between the valve core (22) and the left end cover (23); the pilot valve control port (K1) of the pilot valve (1) is communicated with a main valve control port (K2) of a main valve (2), and the main valve control port (K2) of the main valve (2) is communicated with a right control cavity (2b) of the main valve (2);
the pressure of a pilot valve control port (K1) of the pilot valve (1) is in a first nonlinear characteristic relation (L1) with an input signal, the pressure of a main valve control port (K2) of a main valve (2) is in a linear relation (L2) with the valve port opening degree of the main valve (2), and the valve port opening degree of the main valve (2) is in a second nonlinear characteristic relation (L3) with an output gas flow; through laboratory tests, the output gas flow and input signal are corrected to form a linear relationship, and the pressure value of the intermediate variable pilot valve control port (K1) is solidified into the controller (11).
2. The pilot-operated open-loop controlled proportional flow valve of claim 1, further characterized by: pilot valve module (12) including air inlet solenoid valve (12a), exhaust solenoid valve (12b), pressure sensor (12c) and air circuit bottom plate (12d), controller (11) and air inlet solenoid valve (12a), exhaust solenoid valve (12b) control connection, pressure sensor (12c) feedback connection in controller (11), air inlet solenoid valve (12a) set up between pilot valve air inlet (P1) and pilot valve control mouth (K1), exhaust solenoid valve (12b) set up between pilot valve pressure relief mouth (R1) and pilot valve control mouth (K1).
3. The pilot-operated open-loop controlled proportional flow valve of claim 2, further characterized by: the controller (11) comprises a processor (11a), an M/A analog-to-digital converter (11b), an input/output interface circuit (11c), a display circuit (11d), a power supply (11e) and an electromagnetic valve driving circuit (11 f).
4. The pilot-operated open-loop controlled proportional flow valve of claim 3, further characterized by: the left end of the right end cover (24) is provided with a convex block (24a), and a right control cavity (2b) is formed between the periphery of the convex block (24a) and the inner wall of the valve body (21).
5. The pilot-operated open-loop controlled proportional flow valve of claim 4, further characterized by: a groove (22a) is formed in the middle of the valve core (22).
6. The pilot-operated open-loop controlled proportional flow valve of claim 5, further characterized by: and a sealing ring (26) is arranged between the right end cover (24) and the valve body (21).
7. The pilot-operated open-loop controlled proportional flow valve of claim 6, further characterized by: the right end cover (24) and the valve body (21) are fixed through a screw (27).
8. The pilot-operated open-loop controlled proportional flow valve of claim 7, further comprising: and an outer housing (13) is arranged outside the controller (11) and the pilot valve module (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010199378.4A CN111237278A (en) | 2020-03-20 | 2020-03-20 | Pilot-operated open-loop control proportional flow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010199378.4A CN111237278A (en) | 2020-03-20 | 2020-03-20 | Pilot-operated open-loop control proportional flow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111237278A true CN111237278A (en) | 2020-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010199378.4A Pending CN111237278A (en) | 2020-03-20 | 2020-03-20 | Pilot-operated open-loop control proportional flow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111237278A (en) |
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2020
- 2020-03-20 CN CN202010199378.4A patent/CN111237278A/en active Pending
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