Valve adjusting device with accurate adjusting function

Abstract

The invention relates to a valve adjusting device with an accurate adjusting function. The valve adjusting device comprises a shell, an adjusting shaft in the shell, a guide mechanism and a position identification mechanism. Wherein one end of the adjusting shaft is fixedly connected with the guide mechanism, and the other end of the adjusting shaft penetrates out of the shell and extends into the pneumatic actuator to be synchronously linked with a valve rod in the valve; the guide mechanism is in linkage connection with an output shaft of the power component and synchronously drives the adjusting shaft to drive the pneumatic actuator to move up and down so that a valve rod and a valve element in the valve can be opened and kept or closed at any position. The pneumatic valve has the beneficial effects that rotation of the output shaft can be utilized to drive the guide mechanism to move up and down and drive the adjusting shaft to achieve a mechanical adjusting effect on the valve rod, and meanwhile, the power component synchronously outputs equal high-pressure gas into the pneumatic actuator, so that the pneumatic actuator synchronously achieves a pneumatic adjusting effect on the valve rod; the double adjusting mechanisms of mechanical adjustment and pneumatic adjustment are achieved, mutual backup and mutual error correction are achieved, and the accurate adjustment of the adjusting valve in the using process is effectively improved.

Description

Technical Field

[0001] The present invention relates to a valve, and more particularly to an adjusting device for a valve with an accurate adjustment function, which is mainly applied to the field of valve pipelines. Background Art

[0002] Existing regulating valves on the market generally use pneumatic diaphragm heads to drive. The control system controls the input and output of gas in the pneumatic diaphragm head, and uses the amount of gas input and output to drive the piston plate in the pneumatic diaphragm head to rise and fall, thereby driving the valve stem fixed to the piston plate to rise and fall synchronously, realizing the adjustment and control of the valve opening degree. However, due to certain errors in the gas input and output amounts, it affects the precise control of the valve opening degree and cannot meet the usage requirements of some equipment or pipeline projects that require precise flow control. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides an adjusting device for a valve with an accurate adjustment function. The cooperation of this adjusting device with the pneumatic diaphragm head can realize dual control of the regulating valve by mechanical adjustment and pneumatic adjustment, and they are mutually backed up and corrected with each other, can accurately control the opening degree of the regulating valve, and significantly improve the working stability and use safety of the regulating valve.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is an adjusting device for a valve with an accurate adjustment function, including a housing installed above a pneumatic actuator for controlling the opening of the valve, an adjusting shaft, a guiding mechanism, and a position marking mechanism in the housing; wherein,

[0005] One end of the adjusting shaft is fixedly connected to the guiding mechanism, and the other end passes through the housing and extends into the pneumatic actuator to be synchronously linked with the valve stem in the valve.

[0006] The position marking mechanism is fixed on the guiding mechanism and can move synchronously with the up and down displacement of the guiding mechanism and display the real-time position on the housing.

[0007] The guiding mechanism is linked and connected to the output shaft of the power component, and when the output shaft of the power component rotates forward and backward, the guiding mechanism can synchronously move axially up or down, driving the adjusting shaft to drive the pneumatic actuator to move up and down, so that the valve stem and the valve core in the valve can be opened and maintained or closed at any position.

[0008] Preferably, the guiding mechanism includes a guiding rod and a guiding block. Two guiding rods are arranged side by side and fixed in the housing at intervals. The two ends of the guiding block are sleeved outside the guiding rods. A sliding groove is provided on the guiding block, and a sliding rod is arranged in the sliding groove and the other end of the sliding rod is fixedly connected to a dial, and the other end of the dial is connected to a socket, and the socket is fixed on the output shaft of the power component.

[0009] Preferably, the guiding mechanism further includes at least one set of auxiliary springs, which are sleeved outside the guiding rod located below the guiding block and are in pressing fit with the end face of the guiding block.

[0010] Preferably, a connecting bolt is provided on the housing and is fixed directly above the pneumatic actuator through a connecting bushing. The adjusting shaft is coaxially arranged with the valve stem in the valve, one end of which is fixedly connected to the guiding block of the guiding mechanism, and the other end passes through the connecting bolt and the connecting bushing and extends into the pneumatic actuator to be synchronously linked with the pneumatic actuator.

[0011] Preferably, the position marking mechanism includes a marking post, a transparent plate and a pressing plate. A marking groove is provided on the pressing plate, and the pressing plate is buckled outside the transparent plate to fixedly connect the transparent plate to the housing; one end of the marking post is fixed to the side surface of the guiding block of the guiding mechanism, and the other end extends into the marking groove of the pressing plate and moves up and down along the marking groove when the guiding block moves up or down.

[0012] The beneficial effect of the present invention is that an adjusting device is installed above the pneumatic actuator for driving the valve to open or close, and one end of the adjusting shaft in the adjusting device is connected to the guiding mechanism, and the other end is directly linked to the pneumatic actuator; and the guiding mechanism is connected to the output shaft of the power component; when the valve needs to be opened, the power component can not only drive the guiding mechanism to move up and down by the rotation of the output shaft and drive the adjusting shaft to mechanically adjust the valve stem, but also synchronously output an equal amount of high-pressure gas into the pneumatic actuator to synchronously pneumatically adjust the valve stem by the pneumatic actuator, realizing a dual adjustment mechanism of mechanical adjustment and pneumatic adjustment, and being backup for each other and correcting each other, effectively improving the precise adjustment of the regulating valve during use. Description of the Drawings

[0013] Figure 1 Front perspective view of the adjusting device for a valve with precise adjustment function according to an embodiment of the present invention

[0014] Figure 2 Rear perspective view of the adjusting device for a valve with precise adjustment function according to an embodiment of the present invention

[0015] Figure 3 Cross-sectional structure view of the adjusting device for a valve with precise adjustment function according to an embodiment of the present invention

[0016] Figure 4 Stereo assembly view of the adjusting device for a valve with precise adjustment function according to an embodiment of the present invention

[0017] Figure 5 Assembly cross-sectional view of the adjusting device for a valve with precise adjustment function according to an embodiment of the present invention Detailed Description of the Invention

[0018] The following is combined with the attached Figures 1 to 5A further description of the embodiments of the present invention is as follows:

[0019] Most of the existing regulating valves achieve remote automatic control by means of a pneumatic actuator 5. The pneumatic actuator 5 includes a housing 51 and a piston plate 52. The piston plate 52 divides the housing 51 into two parts, forming two relatively sealed upper and lower chambers 53 and 54 inside the housing 51.

[0020] The regulating valve includes a valve body 1, a valve cover 2, a valve stem 3 and a valve core 4. A valve cavity 11, an inlet 12 and an outlet 13 communicating with the valve cavity 11 are formed in the valve body 1. The valve core 4 is placed in the valve cavity 11 and fixed to one end of the valve stem 3. The other end of the valve stem 3 is placed outside the valve cover 2 and extends into the housing 51 of the pneumatic actuator 5 and is fixedly connected to the piston plate 52. When it is necessary to open or close the regulating valve, the remote control system controls the gas pipeline to inject high-pressure gas into the upper chamber 53 or the lower chamber 54 to make the piston plate 52 rise or fall. Since the valve stem 3 is fixed to the piston plate 52, when the piston plate 52 moves up and down along the housing 51 under the extrusion of high-pressure gas, the valve stem 3 also rises or falls synchronously, thereby driving the opening or closing of the valve core 4.

[0021] Since the opening or closing of the existing regulating valve is realized by the remote control system controlling the on-off of the gas pipeline to open and close the valve, although the opening and closing of the valve can be achieved by using high-pressure gas, due to certain errors in the gas input and output, the stability is relatively poor, and the opening degree of the regulating valve cannot be accurately adjusted and maintained at any opening degree, which cannot meet the use requirements of some equipment or pipeline projects that require precise flow control. For this reason, the present invention provides a regulating device 6 for a valve with an accurate adjustment function, including a housing 61 installed above the pneumatic actuator 5 that controls the opening of the valve. The housing 61 is fixedly connected to the housing 51 of the pneumatic actuator 5. An adjusting shaft 62, a guiding mechanism 63 and a position marking mechanism 64 are provided in the housing 61. One end of the adjusting shaft 62 is fixedly connected to the guiding mechanism 63, and the other end passes through the housing 61 and extends into the pneumatic actuator 5 to be synchronously linked with the valve stem 3 in the valve. The position marking mechanism 64 is fixed on the guiding mechanism 63 and can move synchronously with the up and down displacement of the guiding mechanism 63 and display the real-time position on the housing 61. The guiding mechanism 63 is linked to the output shaft 71 of the control component 7, and when the output shaft 71 of the control component 7 rotates forward and backward, the guiding mechanism 63 can rise or fall axially synchronously, driving the adjusting shaft 62 to drive the pneumatic actuator 5 to move up and down, so that the valve stem 3 and the valve core 4 in the valve can be opened and maintained or closed at any position.

[0022] The above control component 7 is an electro-pneumatic valve positioner. Since it is a mature product on the market, its structure and working principle will not be described in detail here.

[0023] During use, the electro-pneumatic valve positioner is electrically connected to the remote control system and connected to the gas pipeline. The pneumatic actuator 5 is connected to the valve positioner through an air pipe. When the valve needs to be opened, the remote control system sends a DC signal of 4-20 mA to the valve positioner (where the minimum value represents the valve closed state and the maximum value represents the maximum opening degree of the valve). The valve positioner can then control the rotation angle of the output shaft 71 according to the input DC signal. When the output shaft 71 rotates in terms of angle, it drives the guiding mechanism 63 to rise synchronously, and the guiding mechanism 63 drives the adjusting shaft 62 to rise synchronously. Since the adjusting shaft 62 passes through the housing 61 and extends into the pneumatic actuator 5 to be connected to the valve stem 3 of the valve, in this way, the adjusting shaft 62 can drive the valve stem 3 to rise synchronously, thereby opening and maintaining the valve by the valve core 4. To achieve the function of precise adjustment, when the valve positioner controls the rotation angle of the output shaft 71, it simultaneously outputs an equal amount of high-pressure gas into the pneumatic actuator 5 (the equal amount refers to the gas flow rate equal to the height of the valve stem 3 lifted by the rotation angle of the output shaft 71. For example, when the height lifted by the rotation of the output shaft 71 is 10% of the maximum opening degree of the valve, the valve positioner also synchronously inputs 10% of the gas flow rate required for the maximum opening degree into the pneumatic actuator 5). In this way, during the valve opening process, the valve not only has the mechanical adjustment of the adjusting shaft 62 but also has the pneumatic adjustment driven by gas. Moreover, the mechanical adjustment and the pneumatic adjustment are backup for each other and correct each other. When any one of the mechanical adjustment or the pneumatic adjustment mechanisms fails, it can ensure the normal opening or closing of the valve, forming a dual adjustment mechanism to ensure the precise adjustment of the valve opening degree and at the same time improve the use safety of the valve. Since the mechanical adjustment has higher stability, in actual use, the mechanical adjustment of the adjusting shaft 62 is the preferred adjustment method, and the pneumatic adjustment is the auxiliary adjustment mechanism.

[0024] Secondly, directly installing the adjusting device 6 above the pneumatic actuator 5 can not only perform dual adjustment on the opening degree of the valve and improve the precise adjustment degree of the valve; at the same time, it can also optimize the installation structure of the pneumatic actuator 5 and the valve, reduce the connecting components between the pneumatic actuator 5 and the valve body 1, occupy less space, and save installation space.

[0025] The guiding mechanism 63 converts the rotational output of the output shaft 71 in the electro-pneumatic valve positioner into a linear output. To prevent torsion or deflection during the conversion process from affecting the mechanical adjustment function of the adjusting shaft 62 on the valve stem 3, the guiding mechanism 63 includes a guiding rod 631 and a guiding block 632. Two guiding rods 631 are arranged side by side and fixed in the housing 61 at intervals. The two ends of the guiding block 632 are sleeved outside the guiding rods 631. A sliding groove 633 is provided on the guiding block 632. A sliding rod 634 is arranged in the sliding groove 633, and the other end of the sliding rod 634 is fixedly connected to a dial 635. The other end of the dial 635 is connected to a socket 636, and the socket 636 is fixed on the output shaft 71 of the control component 7. By setting the sliding rod 634, the dial 635 and the socket 636, the kinetic energy of the rotational output of the output shaft 71 of the control component 7 can be converted into the kinetic energy of vertical up and down movement to drive the up and down movement of the guiding block 632. To ensure the vertical up and down movement of the guiding block 632, arranging a guiding rod 631 on each side of the guiding block 632 can effectively prevent the guiding block 632 from deflecting or twisting during the up or down movement, thereby ensuring the vertical up and down movement of the adjusting shaft 62 and realizing the mechanical adjustment function of the adjusting shaft 62. To prevent the guiding block 632 from being installed incorrectly, during the production process, the diameters of the two guiding rods 631 are different, which plays a role in error correction.

[0026] To improve the sensitivity of the mechanical adjustment of the adjusting shaft 62 and prevent jamming between the guiding block 632 and the guiding rod 631, the guiding mechanism 63 further includes at least one set of auxiliary springs 637. The auxiliary springs 637 are sleeved outside the guiding rod 631 located below the guiding block 632 and are in abutting pressure fit with the end face of the guiding block 632. By arranging the auxiliary springs 637 outside the guiding rod 631 and below the guiding block 632, when the output shaft 71 of the control component 7 rotates, the guiding block 632 can quickly and synchronously rise under the action of the auxiliary springs 637 to drive the adjusting shaft 62 to move up and down to open the valve. Of course, auxiliary springs 637 can also be arranged on both the upper and lower sides of the guiding block 632 outside the valve stem 3, which can be determined according to the user's needs or the usage scenario specifically, and this embodiment does not make further restrictions.

[0027] To improve the reliability of the mechanical adjustment of the adjusting shaft 62, a connecting bolt 611 is provided on the housing 61 and is fixed directly above the pneumatic actuator 5 through a connecting bushing 612. The adjusting shaft 62 is coaxially arranged with the valve stem 3 in the valve, one end of which is fixedly connected to the guiding block 632 of the guiding mechanism 63, and the other end passes through the connecting bolt 611 and the connecting bushing 612 and extends into the pneumatic actuator 5 to be synchronously linked with the pneumatic actuator 5. By arranging the connecting bolt 611 and the connecting bushing 612, it is not only convenient for connecting and fixing the adjusting device 6 and the pneumatic actuator 5, but also can use the connecting bolt 611 and the connecting bushing 612 to ensure the coaxiality of the adjusting shaft 62 and the valve stem 3, reduce the torque and improve the operation sensitivity of opening or closing the valve.

[0028] To facilitate real-time observation of the opening state or opening degree of the valve, the position identification mechanism 64 includes an identification column 641, a transparent plate 642 and a pressing plate 643. An identification groove 644 is provided on the pressing plate 643, and the pressing plate 643 is buckled outside the transparent plate 642 to fixedly connect the transparent plate 642 to the housing 61; one end of the identification column 641 is fixed to the side surface of the guiding block 632 of the guiding mechanism 63, and the other end extends into the identification groove 644 of the pressing plate 643 and moves up and down along the identification groove 644 when the guiding block 632 rises or falls. By providing the identification column 641 and the transparent plate 642, when the output shaft 71 of the control component 7 rotates to lift or lower the guiding plate, the identification column 641 can move up or down synchronously, so that on-site operators can observe the opening or closing state of the valve in real time or the real-time opening degree of the valve. In actual production, a scale is provided on the transparent plate 642 or the housing 61 to facilitate on-site operators to observe in a more intuitive manner.

[0029] The above embodiments should not be regarded as limitations of the present invention, but any improvements based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A valve regulating device with precise regulating function, characterized in that It includes a housing installed above a pneumatic actuator for controlling the opening of a valve, an adjusting shaft, a guide mechanism and a position marking mechanism in the housing; wherein, One end of the adjusting shaft is connected and fixed to the guide mechanism, and the other end passes through the housing and extends into the pneumatic actuator to be synchronously linked with the valve stem in the valve; The position marking mechanism is fixed on the guide mechanism and can move synchronously with the up and down displacement of the guide mechanism and display the real-time position on the housing; The guide mechanism is linked to the output shaft of the power component, and when the output shaft of the power component rotates forward or reversely, the guide mechanism can synchronously rise or fall axially, drive the adjusting shaft to drive the pneumatic actuator to move up and down so that the valve stem and valve core in the valve can be opened and maintained or closed at any position.

2. The valve regulating device with precise regulating function according to claim 1, characterized in that The guide mechanism includes a guide rod and a guide block. The guide rod is provided with two guide rods fixed side by side in a spaced relationship in the shell. The two ends of the guide block are sleeved outside the guide rod. A slide groove is provided on the guide block. A slide rod is provided in the slide groove and the other end of the slide rod is fixedly connected to the paddle. The other end of the paddle is connected to the sleeve, and the sleeve is fixed on the output shaft of the power component.

3. The valve regulating device with precise regulating function according to claim 2, characterized in that The guide mechanism also includes at least one group of auxiliary springs, which are sleeved outside the guide rod located below the guide block and are pressed against the end surface of the guide block.

4. The valve regulating device with precise regulating function according to claim 1, characterized in that A connecting bolt is provided on the shell and is fixed above the pneumatic actuator through a connecting sleeve. The adjusting shaft is coaxially arranged with the valve stem in the valve, one end of which is fixedly connected to the guide block of the guide mechanism, and the other end passes through the connecting bolt and the connecting sleeve and extends into the pneumatic actuator to be synchronously linked with the pneumatic actuator.

5. The valve regulating device with precise regulating function according to claim 1, characterized in that The position identification mechanism includes an identification column, a transparent plate and a pressure plate. An identification groove is arranged on the pressure plate, and the pressure plate is buckled and pressed on the outside of the transparent plate to fix the transparent plate to the shell. One end of the identification column is fixed to the side of the guide block of the guide mechanism, and the other end extends into the identification groove of the pressure plate and moves up and down along the identification groove when the guide block rises or falls.

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