CN217130497U

CN217130497U - Intelligent valve positioner adopting variable transmission ratio signal acquisition device

Info

Publication number: CN217130497U
Application number: CN202220873114.7U
Authority: CN
Inventors: 陈明; 张庆福; 周云鹏; 王海滨
Original assignee: Beijing Dianyi Technology Co ltd
Current assignee: Beijing Dianyi Technology Co ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-08-05
Anticipated expiration: 2032-04-15

Abstract

The utility model discloses an adopt variable transmission ratio signal pickup assembly's intelligent valve locator, including casing, input shaft and input gear, input gear's double structure sets up the outer gear below for setting up the ring gear above, sets up output gear between ring gear and the outer gear, output gear can reciprocate respectively with ring gear and external gear engagement, set up the potentiometre bottom output gear and promote output gear through moving the structure and reciprocate. The moving structure comprises a connecting plate, one end of the connecting plate is fixedly connected with the output gear, a guide rod of a positioning groove is arranged in the middle of the connecting plate and fixedly connected with the lower portion of the other end of the connecting plate, the guide rod is connected with a supporting seat with a sliding hole in the middle, a limiting hole corresponding to the positioning groove is arranged in the middle of the supporting seat, a steel ball and a spring are filled in the limiting hole, and the outer end of the limiting hole is sealed. The intelligent valve positioner is simple in structure, high in control precision, suitable for valves of different types and specifications, high in universality and low in maintenance cost.

Description

Intelligent valve positioner adopting variable transmission ratio signal acquisition device

Technical Field

The utility model relates to an intelligent valve locator especially relates to an intelligent valve locator who adopts variable transmission ratio signal pickup assembly.

Background

The intelligent valve positioner is a valve positioner which does not need manual adjustment and can automatically set control parameters. The intelligent valve positioner of the straight stroke valve generally converts the straight stroke of a valve rod into angle change through a mechanical mechanism, the intelligent valve positioner of the angular stroke valve generally directly acquires the angle change of a valve plate, the angle change is acquired through a signal acquisition device which is composed of an input shaft 41, an input gear 42, an output gear 43 and a potentiometer 44 of the valve positioner shown in fig. 4, the angle displacement value of the signal acquisition device is generally amplified through input and output gears with different transmission ratios in the signal acquisition process, and the potentiometer converts the amplified displacement parameter into an electric signal to adjust and control the valve.

In order to read the opening degree of the valve more accurately and eliminate the mechanical error of mechanical transmission and the influence of potentiometer precision, the input gear and the output gear of the valve positioner in the prior art generally adopt a constant transmission ratio of 1: 3. For an angular travel valve with an opening and closing angle of more than 90 degrees or a straight travel valve with a valve rod travel of more than 25mm, the transmission ratio is 1:3, the angle requirement can be basically met, the control precision of a valve positioner is difficult to guarantee beyond the range, the problem of low precision of the valve controller is caused, and the application range of the valve controller is also reduced. In order to adapt to angular travel valves or straight travel valves with different specifications, a plurality of valve positioners of signal acquisition devices with different transmission ratios are generally used aiming at angular travel valves with different opening and closing angles or straight travel valves with different valve rod strokes, so that the product universality is poor and the maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that can not adapt to the short slab of the shorter valve of angular travel valve or stroke for solving traditional valve locator mechanical part, the patent is invented one kind and is adapted to simultaneously, and the less general mechanical structure of straight stroke of angular travel valve and stroke has increased the accommodation of intelligent valve locator.

The utility model adopts the technical proposal that: an intelligent valve positioner adopting a variable transmission ratio signal acquisition device comprises a shell and an input shaft which penetrates through the bottom of the shell and is rotatably connected with the shell, wherein the upper part of the input shaft is provided with input gears with a double-row structure, the double-row structure of the input gears comprises an inner gear ring arranged on the upper part and an outer gear arranged on the lower part, an output gear is arranged in a range limited by the inner gear ring and the outer gear, the output gear is pushed to move up and down by a moving structure connected with the output gear and is respectively meshed with the inner gear ring and the outer gear, and the bottom of the output gear is provided with a potentiometer.

The utility model discloses an optimal embodiment of intelligent valve locator is, moving structure includes one end and output gear fixed connection's connecting plate, and the fixed connection middle part is equipped with positioning groove's guide arm below the other end of connecting plate, and the guide arm can be gliding from top to bottom and the middle supporting seat connection that is equipped with the sliding hole, link up the spacing hole that corresponds with positioning groove inside and outside the supporting seat middle part sets up, pack into steel ball and spring and seal spacing hole outer end from inside to outside in proper order in spacing hole.

Furthermore, the outer end of the limiting hole is sealed by adopting a countersunk bolt.

Further, the positioning groove is a tapered groove.

The utility model discloses an optimal implementation mode of intelligent valve locator is, and the drive ratio of ring gear and input gear is 1: 4.

In a preferred embodiment of the intelligent valve positioner of the present invention, the transmission ratio of the external gear to the input gear is 1: 3.

The utility model discloses an intelligent valve locator is a preferred embodiment, and ring gear lower tooth face and outer gear upper tooth face, output gear upper tooth face and lower tooth face of input gear all are equipped with chamfer alpha.

Further, the chamfer angle alpha is 45-65 degrees.

The utility model discloses an optimal implementation mode of intelligent valve locator is, set up the axle sleeve between casing and the input shaft.

The utility model has the advantages that: the output gear moves up and down in a range limited by the inner gear ring and the outer gear to change an engaged object to realize the conversion of two transmission ratios, and the angular travel of 90 degrees can be amplified by nearly 4 times by adopting a 1:4 transmission ratio when an angular travel valve is controlled, so that the range of signals acquired by a full-travel 90-degree potentiometer reaches about 360 degrees; the transmission ratio is switched to 1:4 when the straight stroke valve is controlled to have a small stroke, the reading precision is improved under the condition that other parts are not replaced, and the transmission ratio is switched to 1:3 when the straight stroke valve is controlled to have a large stroke, so that the requirements of the use range of a potentiometer and the signal acquisition precision can be met; the guide rod can slide up and down in the supporting seat, the steel ball is pushed into the tapered hole for positioning by the compression spring at the meshing position, and the change of the output transmission ratio is realized, so that the device is suitable for different working condition requirements of signal acquisition. The utility model discloses a variable transmission ratio signal pickup assembly's intelligent valve locator simple structure, control accuracy are high, are applicable to the valve of different grade type and specification, have stronger commonality, maintain that the maintenance is with low costs.

Drawings

FIG. 1 is a schematic diagram of the state of meshing between an output gear and an inner gear ring of an intelligent valve positioner;

FIG. 2 is a schematic diagram of the engagement state of an output gear and an external gear of the intelligent valve positioner;

FIG. 3 is a schematic diagram of an output gear and its upper and lower planar chamfers;

FIG. 4 is a schematic view of a prior art valve positioner.

The reference numbers in the figures denote: 1-input shaft, 2-input gear, 3-output gear, 4-potentiometer, 5-connecting plate, 6-guide rod, 7-supporting seat, 8-spring, 9-steel ball, 10-shell, 11-shaft sleeve, 21-external gear, 22-internal gear ring, 31-upper tooth surface, 32-lower tooth surface, 33-tooth side meshing surface, 61-positioning groove, 71-sliding hole, 72-limiting hole and 73-countersunk bolt.

Detailed Description

In order to make the technical solutions of the present invention clearer and clearer for those skilled in the art, the present invention will be described in further detail with reference to the following embodiments and drawings, but the embodiments of the present invention are not limited thereto.

Referring to fig. 1-2, in the present embodiment, the intelligent valve positioner using the variable transmission ratio signal acquisition device includes a housing 10 and an input shaft 1 rotatably connected to the housing through the bottom of the housing, and a shaft sleeve 11 may be disposed between the housing and the input shaft. The upper part of the input shaft is provided with an input gear 2 with a double-row structure, an inner gear ring 22 with a larger diameter is arranged in one row on the input gear with the double-row structure, an outer gear 21 with a smaller diameter is arranged in the lower row, and an output gear 3 is arranged in a range limited by the inner diameter of the inner gear ring and the outer diameter of the outer gear. The output gear can move upwards to the position of the inner gear ring to be meshed with the inner gear ring to form a kinematic pair, and the output gear is completely separated from the outer gear. The output gear can also move downwards to the position of the external gear to be meshed with the external gear to form a kinematic pair, and the output gear is completely separated from the internal gear ring. The transmission ratio of the inner gear ring to the input gear is 1:4, and the transmission ratio of the outer gear to the input gear is 1: 3. The potentiometer 4 is arranged at the bottom of the output gear, the connecting plate 5 of the moving structure is fixedly connected with the output gear to push the output gear to move up and down, and the connecting plate of the moving structure can be pushed and pulled by hands in a manual mode to move up or down. The guide rod can slide up and down in the supporting seat, and the steel ball is pushed into the tapered hole for positioning by the compression spring at the meshing position, so that the change of the output transmission ratio is realized, and the requirements of different working conditions of signal acquisition are met.

The moving structure comprises a connecting plate 5, one end of the connecting plate is fixedly connected with the output gear, a guide rod 6 is fixedly connected below the other end of the connecting plate, the middle of the guide rod is provided with a positioning groove 61, and the positioning groove can be a conical groove. The connecting plate and the guide rod can be fixed through bolts, the guide rod can slide up and down and is connected with a supporting seat 7 with a sliding hole 71 in the middle, a limiting hole 72 which is communicated with the positioning groove from inside to outside is arranged in the middle of the supporting seat, a steel ball 9 and a spring 8 are sequentially arranged in the limiting hole from inside to outside, the outer end of the limiting hole is sealed, and the outer end of the limiting hole can be sealed by a countersunk bolt 73. The position of the output gear between the inner gear ring and the outer gear and the position of the axial centerline of the output gear can be defined by the moving structure.

Referring to fig. 3, in the present embodiment, the lower tooth surface of the inner gear ring of the input gear, the upper tooth surface of the outer gear of the input gear, and the upper tooth surface and the lower tooth surface of the output gear are provided with chamfers α. Taking the structure of the output gear chamfer α shown in fig. 3 as an example, the chamfers α of the upper tooth flank 31 and the lower tooth flank 32 of the output gear are the same, and an angle α formed by inclining upward from the flank engagement surface 33 of each tooth is generally 45 ° to 65 °, and a preferable angle α may be 55 °; the lower tooth surface of the inner gear ring and the upper tooth surface of the outer gear form an angle alpha in the same way, and the size of the angle alpha is the same as that of the angle of the meshed output gear. The chamfer with the guiding function can conveniently realize that the output gear is meshed with the inner gear ring of the input gear or the outer gear of the input gear in the up-and-down movement.

Two transmission ratios can be adopted, when the angular travel valve is matched, the 1:4 transmission ratio is adopted, the travel of the angular travel 90 degrees is amplified by nearly 4 times, namely, the input shaft rotates 1 degree, and the signal acquired by the potentiometer is 5 degrees. The signal acquisition range of the full-stroke 90-degree potentiometer is about 360 degrees, and the use range of the potentiometer is met. When the matched straight stroke valve has a large stroke, the transmission ratio is switched to 1:3, and the requirements of the use range of the potentiometer and the signal acquisition precision are met. When the straight stroke valve is matched, the transmission ratio is switched to 1:4 when the stroke is small, and the reading precision is improved under the condition that other parts are not replaced.

When the intelligent valve positioner works, the movement of a valve rod of a valve is transmitted to the input shaft, the input shaft drives the input gear on the input shaft to rotate, and the input gear transmits a rotation angle to the potentiometer through the outer gear with fewer teeth or the inner gear ring with more teeth; the connecting plate slides up and down in the supporting seat through the guide rod, the guide rod is provided with a conical groove, when the guide rod slides up and down, the spring on the supporting seat tightly pushes the steel ball, the steel ball is sunk into the conical groove of the guide rod for positioning, and the output gear can be selectively meshed with the outer gear or the inner gear ring.

When the connecting plate is used for a straight stroke valve, the connecting plate is pressed, the output gear is disengaged from the inner gear ring of the input gear, chamfers of the lower tooth surface of the output gear and the upper tooth surface of the outer gear are beneficial to aligning the meshing position to enable the output gear and the outer gear to be meshed, until the guide rod moves down to the right position, the steel ball on the supporting seat sinks into the conical hole under the action of the spring to be positioned, the positions of the output gear and the outer gear are fixed, and the transmission ratio is 1:3 at the moment, so that the straight stroke valve is suitable; when the connecting plate is used for an angular travel valve, the connecting plate is lifted, the output gear is disengaged from the external gear, the output gear is engaged with the internal gear by aligning the chamfers of the upper tooth surface of the output gear and the lower tooth surface of the internal gear with the engaging positions until the guide rod moves upwards to the right, the steel column on the supporting seat sinks into the tapered hole under the action of the spring to be positioned, and the transmission ratio is 1:4 at the moment, so that the connecting plate is suitable for the angular travel valve or the straight travel valve with smaller travel.

The above description is only a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can replace or change the technical solution and the concept of the present invention within the scope of the present invention.

Claims

1. The intelligent valve positioner adopting the variable transmission ratio signal acquisition device comprises a shell (10) and an input shaft (1) which penetrates through the bottom of the shell and is rotatably connected with the shell, and is characterized in that the upper part of the input shaft is provided with an input gear (2) with a double-row structure, the double-row structure of the input gear is an inner gear ring (22) arranged on the upper part and an outer gear (21) arranged on the lower part, an output gear (3) is arranged in a range limited by the inner gear ring and the outer gear, the output gear is pushed to move up and down through a moving structure connected with the output gear and is respectively meshed with the inner gear ring and the outer gear, and the bottom of the output gear is provided with a potentiometer (4).

2. The intelligent valve positioner adopting the variable transmission ratio signal acquisition device as claimed in claim 1, wherein the moving structure comprises a connecting plate (5) with one end fixedly connected with the output gear, a guide rod (6) with a positioning groove (61) arranged in the middle is fixedly connected below the other end of the connecting plate, the guide rod can be connected with a support seat (7) with a sliding hole (71) arranged in the middle in a vertically sliding manner, a limiting hole (72) which is internally and externally communicated and corresponds to the positioning groove is arranged in the middle of the support seat, and a steel ball (9) and a spring (8) are sequentially arranged in the limiting hole from inside to outside and the outer end of the limiting hole is sealed.

3. The intelligent valve positioner adopting a variable transmission ratio signal acquisition device according to claim 2, wherein the outer end of the limiting hole is closed by a countersunk bolt (73).

4. The intelligent valve positioner employing a variable transmission ratio signal acquisition device of claim 2, wherein the positioning groove is a tapered groove.

5. The intelligent valve positioner adopting a variable transmission ratio signal acquisition device according to claim 1, wherein the transmission ratio of the inner gear ring to the input gear is 1: 4.

6. The intelligent valve positioner using a variable transmission ratio signal acquisition device according to claim 1, wherein the transmission ratio of the external gear to the input gear is 1: 3.

7. The intelligent valve positioner using a variable transmission ratio signal acquisition device according to claim 1, wherein the lower tooth surface of the inner gear ring and the upper tooth surface of the outer gear ring of the input gear, and the upper tooth surface and the lower tooth surface of the output gear are provided with chamfers α.

8. The intelligent valve positioner adopting a variable transmission ratio signal acquisition device according to claim 7, wherein the chamfer angle α is 45-65 °.

9. The intelligent valve positioner using a variable transmission ratio signal acquisition device according to claim 1, wherein a shaft sleeve (11) is arranged between the housing and the input shaft.