Slide valve type amplifier capable of achieving fault locking function

Abstract

The invention discloses a slide valve type amplifier capable of realizing a fault locking function, which comprises a slide valve cavity, an output port I and an output port II are formed in the slide valve cavity, a slide valve rod is arranged in the slide valve cavity in a sliding manner, sealing plates are arranged on two sides of the slide valve rod, two groups of sealing blocks are arranged in the middle of the slide valve rod, and the two groups of sealing blocks are arranged in the middle of the slide valve rod. The sealing plate and the sealing block are arranged in the sliding valve cavity in a sliding mode, the first output port and the second output port are communicated with an inner cavity of the valve air cylinder, communication ports of the first output port and the second output port are located on the two sides of the valve piston, the first output port and the second output port are blocked through the sealing block through sliding displacement, and the valve air cylinder is in a position keeping state in the blocked state. And the slide valve cavity is also correspondingly provided with an air outlet I, an air outlet II and a slide valve cavity air inlet. The invention relates to the technical field of slide valves, and particularly provides a slide valve type amplifier capable of realizing a fault locking function.

Description

Technical Field

[0001] The invention relates to the technical field of slide valves, in particular to a slide valve amplifier capable of realizing a fault locking function. Background Art

[0002] There are two existing technical routes for the development of intelligent valve positioners: one is nozzle baffle technology, and the other is piezoelectric ceramic technology. Nozzle baffle technology has become the mainstream technology in the industry due to its strong ability to resist dust and oil pollution. Among them, nozzle baffle technology has two directions, one is nozzle technology + membrane valve structure, and the other is nozzle technology + slide valve structure. The nozzle slide valve amplifier can output a large CV value, is easy to maintain, and has high reliability. Many manufacturers use this technology to produce positioners. Looking at the domestic and foreign markets, the positioner developed using this technology can only provide a fault safety function, that is, it can only achieve power failure, signal failure, and gas failure. The valve is in a fault closed (FC) or fault open (FO), and cannot achieve a fault position retention, commonly known as a fault lockout function. The fault lockout function is that when the positioner is in a power failure or signal failure, the valve position can be maintained in the state before the power failure or signal failure. This function is required in places such as the damper control of thermal power plants. The traditional approach is to add a power failure comparator and an external solenoid valve to the positioner to achieve this function, which not only increases the user's procurement cost, but also reduces the reliability of the product. This patent is invented to address the common lack of fault locking function in positioners using sliding valve technology, and will help push the localization technology of intelligent valve positioners to a new level. Summary of the invention

[0003] In view of the above situation, in order to remedy the above existing defects, the present invention provides a slide valve amplifier that can realize the fault locking function.

[0004] The present invention provides the following technical inventions: the present scheme provides a slide valve amplifier capable of realizing a fault locking function, comprising a slide valve cavity, the slide valve cavity is provided with an output port 1 and an output port 2, a slide valve rod is slidably provided in the slide valve cavity, sealing plates are provided on both sides of the slide valve rod, two groups of sealing blocks are provided in the middle of the slide valve rod, the sealing plates and the sealing blocks are slidably provided inside the slide valve cavity, the output port 1 and the output port 2 are communicated with the inner cavity of the valve cylinder, the connecting ports of the output port 1 and the output port 2 are located on both sides of the valve piston, the sealing blocks block the output port 1 and the output port 2 by sliding displacement, the valve cylinder is in a position-holding state in the blocked state, which is also the state of fault locking, the slide valve cavity is also correspondingly provided with an air outlet port 1, an air outlet port 2 and an air inlet of the slide valve cavity, the air inlet of the slide valve cavity is located between the air outlet port 1 and the air outlet port 2, the inner side wall of the slide valve cavity is provided with a support spring 1, the support spring 1 is connected to a group of sealing plates, and the other end of the slide valve rod passes through the slide valve cavity and extends to the outside;

[0005] A back-pressure cavity is provided on one side of the sliding valve cavity, and one side of the back-pressure cavity is open. A diaphragm is provided at the opening of the back-pressure cavity, one end of the sliding valve rod passes through the opening and is connected to the diaphragm, a nozzle is provided on the other side of the back-pressure cavity, and the nozzle is connected to the inside of the back-pressure cavity, and a supporting spring 2 is also provided in the back-pressure cavity, and the other end of the supporting spring 2 is connected to the diaphragm, and a back-pressure cavity air inlet is also provided on the side wall of the back-pressure cavity, and the sliding valve cavity air inlet and the back-pressure cavity air inlet are externally connected to a constant pressure generator, and an air source is blown into the sliding valve cavity and the back-pressure cavity through the constant pressure generator.

[0006] Furthermore, the sliding valve cavity also includes a coil baffle module, and the coil baffle module includes a baffle, a magnetic core and an electromagnetic coil. One end of the baffle is located on one side of the nozzle, a support block is provided in the middle of the baffle, and the magnetic core is provided on the other side of the baffle. When in use, when a forward current or a reverse current is passed through the electromagnetic coil, the baffle tilts to the right or to the left, the pressure in the back pressure cavity increases or decreases, and the diaphragm drives the sliding valve stem to move, thereby driving the sealing plate and the sealing block to move. This is a dynamic adjustment process of the valve cylinder. In conjunction with the control strategy, when the valve position reaches the target position, the coil output current gradually drops to 0, and the sliding valve is in Figure 1 In the state shown, the valve cylinder is blocked. If the power, signal or air is cut off, the valve will be in the position before the fault, thus achieving fault locking.

[0007] To realize the fault lockout function, it is critical to design the slide valve in state A when the input current is 0. To meet the needs of reliability work, a certain dead zone buffer zone needs to be set at 0 input current. Generally, this range is -0.3~+0.3mA. That is to say, the slide valve amplification mechanical design static working point is within this range of coil input current, and output ports 1 and 2 are in closed state.

[0008] The beneficial effects achieved by the present invention using the above structure are as follows: the present invention proposes a slide valve amplifier capable of realizing a fault locking function, the dynamic adjustment process of the valve cylinder is to input positive and negative currents to the coil baffle module to realize the discharge of the gas path from the output port 1 or the output port 2, when the valve reaches the target position, the coil output current gradually decreases to 0, and the slide valve amplifier is in the following state Figure 1 As shown, output port 1 and output port 2 are in a closed state, and they remain in a closed state even when power, signal, and gas are cut off, thereby achieving fault locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0010] Figure 1Schematic structural diagram of the fault locking state of a spool-type amplifier capable of implementing a fault locking function proposed by the present invention;

[0011] Figure 2 Schematic structural diagram of a spool-type amplifier capable of implementing a fault locking function proposed by the present invention when applying a positive current;

[0012] Figure 3 Schematic structural diagram of a spool-type amplifier capable of implementing a fault locking function proposed by the present invention when applying a reverse current.

[0013] Among them, 1. Spool cavity, 2. Output port 1, 3. Output port 2, 4. Spool rod, 5. Sealing plate, 6. Sealing block, 7. Air outlet 1, 8. Air outlet 2, 9. Spool cavity air inlet, 10. Support spring 1, 11. Back pressure cavity, 12. Diaphragm, 13. Nozzle, 14. Support spring 2, 15. Back pressure cavity air inlet, 16. Coil baffle module, 17. Baffle, 18. Magnetic core, 19. Electromagnetic coil, 20. Support block, 21. Constant pressure generator. Specific implementation manners

[0014] Next, the technical inventions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0016] Such as Figures 1 to 3As shown, the technical invention adopted by the present invention is as follows: a slide valve amplifier capable of realizing a fault locking function, comprising a slide valve cavity 1, an output port 1 2 and an output port 2 3 are arranged on the slide valve cavity 1, a slide valve rod 4 is slidably arranged in the slide valve cavity 1, sealing plates 5 are arranged on both sides of the slide valve rod 4, and two groups of sealing blocks 6 are arranged in the middle of the slide valve rod 4, the sealing plates 5 and the sealing blocks 6 are slidably arranged in the slide valve cavity 1, the output port 1 2 and the output port 2 3 are connected with the inner cavity of the valve cylinder, the connecting ports of the output port 1 2 and the output port 2 3 are located on both sides of the valve piston, the sealing blocks 6 are blocked on the output port 1 2 and the output port 2 3 by sliding displacement, and the valve cylinder is in a position-holding state in the blocked state, which is also the state of fault locking, the slide valve cavity 1 is also correspondingly provided with an air outlet 1 7, an air outlet 2 8 and a slide valve cavity air inlet 9, and the slide valve cavity air inlet 9 is located between the air outlet 1 7 and Between the air outlet 8, a support spring 10 is provided on the inner side wall of the sliding valve cavity 1, and the support spring 10 is connected to a group of sealing plates 5. The other end of the sliding valve rod 4 passes through the sliding valve cavity 1 and extends to the outside; a back pressure cavity 11 is provided on one side of the sliding valve cavity 1, and one side of the back pressure cavity 11 is open. A diaphragm 12 is provided at the opening of the back pressure cavity 11, one end of the sliding valve rod 4 passes through the opening and is connected to the diaphragm 12, and a nozzle 13 is provided on the other side of the back pressure cavity 11, and the nozzle 13 is connected to the inside of the back pressure cavity 11. A support spring 14 is also provided in the back pressure cavity 11, and the other end of the support spring 14 is connected to the diaphragm 12. A back pressure cavity air inlet 15 is also provided on the side wall of the back pressure cavity 11, and the sliding valve cavity air inlet 9 and the back pressure cavity air inlet 15 are externally connected to a constant pressure generator 21, and the air source is blown into the sliding valve cavity 1 and the back pressure cavity 11 through the constant pressure generator 21.

[0017] like Figure 2 As shown, the slide valve chamber 1 also includes a coil baffle module 16, which includes a baffle 17, a magnetic core 18 and an electromagnetic coil 19. One end of the baffle 17 is located on one side of the nozzle 13, and a support block 20 is provided in the middle of the baffle 17. The magnetic core 18 is provided on the other side of the baffle 17. When in use, when a positive current is passed through the electromagnetic coil 19, the baffle 17 tilts to the right, the pressure of the back pressure chamber 11 increases, and the diaphragm 12 drives the slide valve stem 4 to move to the right, thereby driving the sealing plate 5 and The sealing block 6 moves, and the air inlet 9 of the slide valve cavity is connected with the output port 1-2. The gas output of the output port 1-2 is proportional to the displacement of the slide valve rod 4 to the right, that is, the gas output of the output port 1-2 increases with the increase of the input coil current. At the same time, the gas path of the output port 2-3 is connected with the gas outlet 2-8 of the slide valve type amplifying gas, and the gas in the cylinder is exhausted to the outside through this circuit. The exhaust volume is proportional to the input coil current. When the valve position reaches the target position, the coil output current gradually drops to 0, and the slide valve is in Figure 1 In the state shown, the valve cylinder is blocked. If the power, signal, or air is cut off, the valve will be in the position before the fault, achieving fault locking.

[0018] like Figure 3As shown, when reverse current is passed through the electromagnetic coil 19, the baffle 17 tilts to the left, the pressure of the back pressure chamber 11 decreases, and the support spring 14 pulls the diaphragm 12 to move to the left, thereby driving the slide valve rod 4 to move to the left, thereby driving the sealing plate 5 and the sealing block 6 to move, and the slide valve chamber air inlet 9 is connected with the output port 23, and at the same time, the output port 12 gas path is connected with the slide valve type amplification air outlet 17. When the valve position reaches the target position, the coil output current gradually decreases to 0, and the slide valve is in Figure 1 In the state shown, the valve cylinder is blocked. If the power, signal or air is cut off, the valve will be in the position before the fault, thus achieving fault locking.

[0019] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, material or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, material or apparatus.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slide valve amplifier capable of realizing a fault locking function, characterized in that: It comprises a sliding valve cavity, the sliding valve cavity is provided with an output port 1 and an output port 2, a sliding valve rod is slidably provided in the sliding valve cavity, sealing plates are provided on both sides of the sliding valve rod, two groups of sealing blocks are provided in the middle of the sliding valve rod, the sealing plates and the sealing blocks are slidably provided in the sliding valve cavity, the sliding valve cavity is also provided with an air outlet 1, an air outlet 2 and an air inlet of the sliding valve cavity correspondingly, the air inlet of the sliding valve cavity is located between the air outlet 1 and the air outlet 2, a supporting spring 1 is provided on the inner side wall of the sliding valve cavity, the supporting spring 1 is connected to a group of sealing plates, and the other end of the sliding valve rod passes through the sliding valve cavity and extends to the outside; A back pressure cavity is provided on one side of the sliding valve cavity, and one side of the back pressure cavity is open. A diaphragm is provided at the opening of the back pressure cavity. One end of the sliding valve rod passes through the opening and is connected to the diaphragm. A nozzle is provided on the other side of the back pressure cavity, and the nozzle is connected to the inside of the back pressure cavity. A supporting spring 2 is also provided in the back pressure cavity, and the other end of the supporting spring 2 is connected to the diaphragm. A back pressure cavity air inlet is also provided on the side wall of the back pressure cavity, and the sliding valve cavity air inlet and the back pressure cavity air inlet are externally connected to a constant pressure generator.

2. A slide valve amplifier capable of realizing a fault locking function according to claim 1, characterized in that: The slide valve cavity also includes a coil baffle module, which includes a baffle, a magnetic core and an electromagnetic coil. One end of the baffle is located on one side of the nozzle, a support block is provided in the middle of the baffle, and the magnetic core is provided on the other side of the baffle.

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