Valve adjusting device with accurate adjusting function

Abstract

The utility model 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 utility model has the beneficial effects that not only can the guide mechanism be driven to move up and down by utilizing the rotation of the output shaft and the adjusting shaft be driven to mechanically adjust the valve rod, but also the power part synchronously outputs the same amount of high-pressure gas into the pneumatic actuator, so that the pneumatic actuator synchronously performs pneumatic adjustment 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] This utility model relates to a valve, and more specifically to a valve regulating device with precise adjustment function, mainly used in the field of valve pipelines. Background Technology

[0002] Currently available control valves generally use pneumatic diaphragm heads for actuation. The control system controls the input and output of gas within the pneumatic diaphragm head. The magnitude of the input and output gas volume drives the piston plate inside the pneumatic diaphragm head to rise and fall, which in turn drives the valve stem, fixed to the piston plate, to rise and fall synchronously, thus achieving valve opening control. However, due to a certain degree of error in the gas input and output volume, the precise control of the valve opening is affected, failing to meet the needs of some equipment or pipeline projects requiring precise flow control. Utility Model Content

[0003] To solve the above technical problems, this utility model provides a valve regulating device with precise adjustment function. The regulating device, in conjunction with the pneumatic diaphragm head, can realize dual regulation and control of the regulating valve by mechanical and pneumatic adjustment, and can back up and correct each other. It can accurately control the opening degree of the regulating valve, and significantly improve the working stability and safety of the regulating valve.

[0004] To solve the above technical problems, the present invention provides a valve regulating device with precise adjustment function, comprising a housing mounted above a pneumatic actuator that controls the opening of the valve, and an adjusting shaft, a guiding mechanism, and a position marking mechanism within the housing; wherein,

[0005] One end of the adjusting shaft is fixed to the guide mechanism, and the other end extends out of the housing and into the pneumatic actuator to move synchronously with the valve stem in the valve.

[0006] The position marking mechanism is fixed on the guide mechanism and can move synchronously with the up and down displacement of the guide mechanism, displaying the real-time position on the housing;

[0007] The guide mechanism is linked to the output shaft of the power unit. When the output shaft of the power unit rotates in the forward and reverse directions, the guide mechanism can rise or fall axially in sync, driving the adjusting shaft to move the pneumatic actuator up and down, so that the valve stem and valve core in the valve can be opened and held or closed at any position.

[0008] Preferably, the guiding mechanism includes a guide rod and a guide block. The guide rod has two parallel and spaced-apart fixed inside the housing. The two ends of the guide block are sleeved outside the guide rod. A sliding groove is provided on the guide block. A sliding rod is provided in the sliding groove, and the other end of the sliding rod is fixedly connected to a paddle. The other end of the paddle is connected to a sleeve, and the sleeve 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 on the guide rod located below the guide block and press against the end face of the guide block.

[0010] Preferably, a connecting bolt is provided on the housing and fixed directly above the pneumatic actuator by a connecting bushing. The adjusting shaft is coaxially set with the valve stem in the valve. One end of the adjusting shaft is fixedly connected to the guide 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 move synchronously with the pneumatic actuator.

[0011] Preferably, the position marking mechanism includes a marking post, a transparent plate, and a pressure plate. A marking groove is provided on the pressure plate, and the pressure plate is pressed against the outside of the transparent plate to fix the transparent plate to the housing. One end of the marking post is fixed to the side of the guide block of the guide mechanism, and the other end extends into the marking groove of the pressure plate and moves up and down along the marking groove when the guide block rises or falls.

[0012] The beneficial effect of this utility model is that an adjustment device is added above the pneumatic actuator that drives the valve to open or close, and one end of the adjustment shaft in the adjustment device is connected to the guide mechanism, while the other end is directly linked to the pneumatic actuator; the guide mechanism is connected to the output shaft of the power component; when the valve needs to be opened, the power component can not only use the rotation of the output shaft to drive the guide mechanism to move up and down and drive the adjustment shaft to mechanically adjust the valve stem, but also simultaneously output an equal amount of high-pressure gas into the pneumatic actuator so that the pneumatic actuator can simultaneously pneumatically adjust the valve stem, realizing a dual adjustment mechanism of mechanical and pneumatic adjustment, which serves as a backup and mutual error correction, effectively improving the precise adjustment of the control valve during use. Attached Figure Description

[0013] Figure 1 A front perspective view of a valve regulating device with precise adjustment function according to an embodiment of this utility model.

[0014] Figure 2 Rear perspective view of a valve regulating device with precise adjustment function according to an embodiment of this utility model.

[0015] Figure 3 This is a cross-sectional view of a valve regulating device with precise regulating function according to an embodiment of the present invention.

[0016] Figure 4 This is a three-dimensional assembly drawing of a valve regulating device with precise adjustment function according to an embodiment of the present invention.

[0017] Figure 5 This is an assembly cross-sectional view of a valve regulating device with precise regulating function according to an embodiment of the present invention. Detailed Implementation

[0018] The following is in conjunction with the appendix Figures 1-5The embodiments of this utility model are further described below:

[0019] Most existing control valves are remotely automatically controlled by pneumatic actuators 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 chambers 53 and lower chambers 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 is formed within the valve body 1, with an inlet 12 and an outlet 13 respectively connected to the valve cavity 11. 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, where it is fixedly connected to the piston plate 52. When the regulating valve needs to be opened or closed, the remote control system controls the gas pipeline to inject high-pressure gas into the upper chamber 53 or lower chamber 54, causing the piston plate 52 to 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 pressure of the high-pressure gas, the valve stem 3 also rises or falls synchronously, thereby driving the valve core 4 to open or close.

[0021] Because existing regulating valves are opened or closed by remotely controlling the flow of gas pipelines, while high-pressure gas can achieve this, the stability is relatively poor due to inherent errors in gas input and output. This makes it impossible to precisely adjust the valve opening and maintain it at any given degree, failing to meet the needs of equipment or pipeline projects requiring precise flow control. Therefore, this invention provides a valve regulating device 6 with precise adjustment capabilities, including a housing 61 mounted above a pneumatic actuator 5 that controls valve opening. The housing 61 is fixedly connected to the outer shell 51 of the pneumatic actuator 5. An adjusting shaft 62, a guiding mechanism 63, and a position marking mechanism 64 are provided inside the housing 61. One end of the adjusting shaft 62 is fixedly connected to the guiding mechanism 63, and the other end extends out of the housing 61 and into the pneumatic actuator 5 to synchronously move 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, displaying 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 in both directions, the guiding mechanism 63 can synchronously rise or fall axially, driving the adjusting shaft 62 to drive the pneumatic actuator 5 to move up and down, so that the valve stem 3 and valve core 4 in the valve can be opened and held or closed at any position.

[0022] The aforementioned control component 7 is an electro-pneumatic valve positioner. As 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 via a gas pipe. When the valve needs to be opened, the remote control system sends a 4~20mA DC signal to the valve positioner (where the minimum value is the valve closed state and the maximum value is the valve's maximum opening degree). 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, it drives the guide mechanism 63 to rise synchronously. The guide mechanism 63, in turn, drives the adjusting shaft 62 to rise synchronously. Since the adjusting shaft 62 extends out of the housing 61 and into the pneumatic actuator 5 to connect with the valve stem 3, the adjusting shaft 62 can drive the valve stem 3 to rise synchronously, thereby opening and maintaining the valve core 4. To achieve precise adjustment, the valve positioner, while controlling the rotation angle of the output shaft 71, simultaneously outputs an equal amount of high-pressure gas to the pneumatic actuator 5. (Equal amount means the gas flow rate is equal to the height of the valve stem 3 raised by the rotation angle of the output shaft 71. For example, when the height raised by the output shaft 71 is 10% of the maximum valve opening, the valve positioner also simultaneously inputs 10% of the gas flow rate required for the maximum opening into the pneumatic actuator 5.) This allows the valve to have both mechanical adjustment via the adjusting shaft 62 and pneumatic adjustment during opening. Furthermore, the mechanical and pneumatic adjustments serve as backups and correct each other. If either the mechanical or pneumatic adjustment mechanism fails, the valve can still be opened or closed normally, forming a dual adjustment mechanism to ensure precise valve opening and improve valve safety. Because mechanical adjustment is more stable, it is prioritized in actual use, with pneumatic adjustment serving as an auxiliary mechanism.

[0024] Secondly, by directly installing the adjustment device 6 above the pneumatic actuator 5, not only can the valve opening degree be adjusted in two ways to improve the valve's precision adjustment, but it can also optimize the installation structure of the pneumatic actuator 5 and the valve, reduce the connecting parts between the pneumatic actuator 5 and the valve body 1, occupy less space, and save installation space.

[0025] The guide mechanism 63 changes the rotational output of the output shaft 71 in the electro-pneumatic valve positioner to a linear output. To prevent twisting or deflection during the conversion process from affecting the mechanical adjustment of the valve stem 3 by the regulating shaft 62, the guide mechanism 63 includes a guide rod 631 and a guide block 632. The guide rod 631 has two parallel and spaced fixed inside the housing 61. The guide block 632 is sleeved on both ends of the guide rod 631. A sliding groove 633 is provided on the guide block 632. A sliding rod 634 is provided in the sliding groove 633, and the other end of the sliding rod 634 is fixedly connected to a paddle 635. The other end of the paddle 635 is connected to a sleeve 636, and the sleeve 636 is fixed on the output shaft 71 of the control component 7. By configuring the slide bar 634, the lever 635, and the sleeve 636, the kinetic energy output from the rotation of the output shaft 71 of the control component 7 can be converted into vertical up-and-down kinetic energy to drive the guide block 632 to rise and fall. To ensure the vertical rise and fall of the guide block 632, a guide rod 631 is provided on each side of the guide block 632 to effectively prevent the guide block 632 from deflecting or twisting during the rise or fall, thereby ensuring the vertical rise and fall of the adjusting shaft 62 and realizing the mechanical adjustment function of the adjusting shaft 62. To prevent incorrect installation of the guide block 632, the two guide rods 631 have different diameters during the production process, which serves as a correction function.

[0026] To improve the sensitivity of the mechanical adjustment of the adjusting shaft 62 and prevent jamming between the guide block 632 and the guide rod 631, the guiding mechanism 63 also includes at least one set of auxiliary springs 637. These auxiliary springs 637 are sleeved on the guide rod 631 located below the guide block 632 and press against the end face of the guide block 632. By providing the auxiliary springs 637 outside the guide rod 631 below the guide block 632, when the output shaft 71 of the control component 7 rotates, the guide block 632 can quickly and synchronously rise under the action of the auxiliary springs 637, causing the adjusting shaft 62 to move up and down to open the valve. Alternatively, auxiliary springs 637 can be provided on both the upper and lower sides of the guide block 632 outside the valve stem 3, depending on user needs or usage scenarios; this embodiment does not impose further limitations.

[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 it is fixed to the top of 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 the adjusting shaft 62 is fixedly connected to the guide block 632 of the guide 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 move synchronously with the pneumatic actuator 5. By setting the connecting bolt 611 and the connecting bushing 612, it is not only convenient to connect and fix the adjusting device 6 and the pneumatic actuator 5, but also the connecting bolt 611 and the connecting bushing 612 can be used to ensure the coaxiality of the adjusting shaft 62 and the valve stem 3, reduce torque and improve the operational sensitivity of the valve opening or closing.

[0028] To facilitate real-time observation of the valve's opening status or degree of opening, the position marking mechanism 64 includes a marking post 641, a transparent plate 642, and a pressure plate 643. A marking groove 644 is provided on the pressure plate 643, and the pressure plate 643 presses against the transparent plate 642, fixing the transparent plate 642 to the housing 61. One end of the marking post 641 is fixed to the side of the guide block 632 of the guide mechanism 63, and the other end extends into the marking groove 644 of the pressure plate 643, moving up and down along the marking groove 644 when the guide block 632 rises or falls. By setting the marking post 641 and the transparent plate 642, when the output shaft 71 of the control component 7 rotates to raise or lower the guide plate, the marking post 641 can move upward or downward synchronously, allowing on-site operators to observe the valve's opening or closing status or the valve's opening degree in real time. In actual production, a scale is provided on the transparent plate 642 or the housing 61 for more intuitive observation by on-site operators.

[0029] The above embodiments should not be regarded as limitations on the present invention, but any improvements made 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... Includes a housing mounted above the pneumatic actuator controlling the opening of the valve, and within the housing are an adjusting shaft, a guiding mechanism, and a position marking mechanism; wherein, One end of the adjusting shaft is fixed to the guide mechanism, and the other end extends out of the housing and into the pneumatic actuator to move synchronously 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, displaying the real-time position on the housing; The guide mechanism is linked to the output shaft of the power unit. When the output shaft of the power unit rotates in the forward and reverse directions, the guide mechanism can rise or fall axially in sync, driving the adjusting shaft to move the pneumatic actuator up and down, so that the valve stem and valve core in the valve can be opened and held or closed at any position.

2. The regulating device for a valve with precise regulating function according to claim 1, characterized in that... The guiding mechanism includes a guide rod and a guide block. Two guide rods are fixed in the housing at intervals. The two ends of the guide block are sleeved on the outside of the guide rod. A sliding groove is provided on the guide block. A sliding rod is provided in the sliding groove, and the other end of the sliding rod is fixedly connected to a paddle. The other end of the paddle is connected to a sleeve, and the sleeve is fixed on the output shaft of the power component.

3. The regulating device for a valve with precise regulating function according to claim 2, characterized in that... The guiding mechanism also includes at least one set of auxiliary springs, which are sleeved on the guide rod located below the guide block and press against the end face of the guide block.

4. The regulating device for a valve with precise regulating function according to claim 1, characterized in that... The housing is provided with connecting bolts and is fixed to the top of the pneumatic actuator by connecting bushings. The adjusting shaft is coaxial with the valve stem in the valve. One end of the adjusting shaft is fixedly connected to the guide block of the guiding mechanism, and the other end passes through the connecting bolts and connecting bushings and extends into the pneumatic actuator to move synchronously with the pneumatic actuator.

5. The regulating device for a valve with precise regulating function according to claim 1, characterized in that... The location marking mechanism includes a marking post, a transparent plate, and a pressure plate. A marking groove is provided on the pressure plate, and the pressure plate is pressed against the outside of the transparent plate to fix the transparent plate to the housing. One end of the marking post is fixed to the side of the guide block of the guide mechanism, and the other end extends into the marking groove of the pressure plate and moves up and down along the marking groove when the guide block rises or falls.

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