Vacuum-resistant zero-leakage large-adjustable-ratio regulating valve

Abstract

A vacuum-resistant zero-leakage large-adjustable-ratio regulating valve, comprising a valve stem (110) and a sealing mechanism. The sealing mechanism comprises an outer bellows (601), an inner bellows (602), a sleeve (700), and a regulating assembly. Under the action of the regulating assembly, while the valve stem (110) moves up and down, the regulating assembly enables the amounts of change in the inner bellows (602) and the outer bellows (601) to be both smaller than the distance by which the valve stem (110) moves upwards or downwards, so as to prolong the service life of the outer bellows (601) and the inner bellows (602). In addition, while the valve stem (110) moves, the amount of elongation of the inner bellows (602) is greater than the amount of compression, and the amount of elongation of the outer bellows (601) is greater than the amount of compression, thereby further prolonging the service life of the outer bellows (601) and the inner bellows (602).

Description

A vacuum-resistant, zero-leakage, highly adjustable regulating valve Technical Field

[0001] This invention relates to the field of control valve technology, and specifically to a vacuum-resistant, zero-leakage, large-adjustable control valve. Background Technology

[0002] Control valves (also known as regulating valves) are core devices in process control systems that change fluid flow through power operation. They are key control components of instrumentation systems and play a vital regulatory role in automated production processes. They achieve flow control by changing pipeline resistance and can be classified into two types based on their sealing structure: ordinary valves and bellows valves. Bellows control valves, which use bellows instead of traditional stuffing boxes, achieve zero leakage at the valve stem and are suitable for applications requiring high sealing performance.

[0003] Bellows are commonly used for sealing in control valves. Bellows include U-shaped bellows, where the corrugations are deeper and the radius of curvature is larger. During tension, the openings of the bellows better disperse stress, preventing excessive stress concentration at the root and thus reducing the risk of fatigue crack initiation. However, existing bellows control valves suffer from poor durability due to the inherent mechanical properties of the bellows, making them prone to fatigue after prolonged use. To improve bellows durability, current technology generally increases the bellows length to reduce its relative compression; however, this method requires a considerably long valve stem, consuming significant space.

[0004] For example, the invention patent with announcement number CN114382897B provides a high-risk medium anti-clogging back-sealing bellows regulating valve. In this patent, the bellows and the regulating valve are in a detachable sealing state, which is convenient for replacement. When the regulating valve is blocked, a connecting structure can be added to reduce loosening, and the medium can change the flow direction through an inclined baffle. However, after long-term use, the bellows is prone to fatigue, which in turn affects its sealing performance. Summary of the Invention

[0005] This invention provides a vacuum-resistant, zero-leakage, highly adjustable regulating valve to solve the problem that bellows are prone to fatigue after prolonged use, which in turn affects their sealing performance.

[0006] The present invention provides a vacuum-resistant, zero-leakage, highly adjustable regulating valve with the following technical solution: The valve includes a valve body, a valve stem, and a sealing mechanism. The valve body has an installation cavity and two flow channels communicating with the installation cavity. The valve stem is vertically positioned and slidably disposed within the installation cavity.

[0007] The sealing mechanism includes an outer bellows, an inner bellows, a sleeve, and an adjusting assembly. The sleeve, inner bellows, and outer bellows are all coaxially arranged with the valve stem, and are distributed from the inside out. The sleeve and valve stem are rotatably connected. The upper end of the outer bellows is connected to the valve body, and a connecting ring is provided at the lower end of the outer bellows. The connecting ring is slidably disposed outside the sleeve. The upper end of the inner bellows is connected to the valve stem, and the lower end of the inner bellows is connected to the connecting ring. Both the inner and outer bellows are U-shaped bellows. The inner and outer bellows are of the same length and type; the U-shaped bellows have high durability when stretched.

[0008] Initially, the valve stem partially blocks the flow channel, and the upper ends of both the outer and inner bellows are flush. When the valve stem moves downward, the inner bellows compresses and the outer bellows extends. When the valve stem moves upward, the inner bellows stretches and the outer bellows compresses.

[0009] The adjusting mechanism ensures that the changes in both the inner and outer bellows are less than the distance the valve stem moves up or down. Furthermore, during valve stem movement, the elongation of the inner bellows exceeds its compression, and the elongation of the outer bellows exceeds its compression, thus extending the service life of both the inner and outer bellows.

[0010] Furthermore, both the inner and outer corrugated pipes are U-shaped corrugated pipes, and the length and type of the inner and outer corrugated pipes are the same. U-shaped corrugated pipes have strong durability when stretched.

[0011] Furthermore, a first helical groove is formed within the mounting cavity, and a second and third helical grooves, which communicate with each other, are formed on the lower peripheral wall of the sleeve, with the second helical groove located above the third helical groove. The pitch of the second helical groove is smaller than that of the third helical groove, and the unfolded lengths of the helical lines of the second and third helical grooves are the same. The sum of the pitches of the second and third helical grooves is half the pitch of the first helical groove.

[0012] The adjusting assembly includes a first slider and a second slider. The first slider is fixedly mounted on the sleeve and slidably disposed within a first helical groove. The second slider is fixedly mounted inside the connecting ring and slidably disposed within a second or third helical groove. In the initial state, the second slider is located at the junction of the second and third helical grooves.

[0013] Furthermore, a vacuum-resistant, zero-leakage, highly adjustable regulating valve also includes a rising baffle, which is positioned between the outer bellows and the inner bellows. The lower end of the rising baffle abuts against the connecting ring. The rising baffle serves to support the outer and inner bellows.

[0014] Furthermore, a sealing bellows is fitted around the outside of the lifting baffle, which is located at the top of the lifting baffle and connects the lifting baffle and the valve body.

[0015] Furthermore, a first annular groove is formed on the inner wall of the mounting cavity, and a first damping cavity is formed between the first annular groove and the lifting baffle tube, which contains damping fluid. A first annular plate is provided on the outer peripheral wall of the lifting baffle tube, and the first annular plate is slidably disposed in the first damping cavity to reduce the vibration caused by water flow impact on the lifting baffle tube.

[0016] Furthermore, a vacuum-resistant, zero-leakage, highly adjustable regulating valve also includes a connecting pipe, which is slidably fitted onto the outside of the sleeve, and the connecting pipe is fixedly connected to the upper side of the inner bellows. A first retaining ring, a second retaining ring, and a third retaining ring are fixedly installed sequentially from top to bottom on the outer peripheral wall of the connecting pipe. The connecting pipe is located inside the lifting baffle, and the second retaining ring is fixedly connected to the lifting baffle.

[0017] An upper damping bellows and a lower damping bellows are fitted on the outside of the connecting pipe. The upper damping bellows connects to the first and second retaining rings, and the lower damping bellows connects to the second and third retaining rings. Damping fluid is provided between the upper damping bellows and the connecting pipe, and between the lower damping bellows and the connecting pipe, to reduce the vibration caused by water flow impact on the inner bellows.

[0018] Furthermore, a vacuum-resistant, zero-leakage, highly adjustable regulating valve also includes a first driving mechanism, which comprises an air box, an air pump, and a piston plate. The air box is mounted on the valve body. The piston plate is horizontally positioned and slides vertically within the air box, forming an air chamber in the space below the piston plate. An air pipe is mounted on the air pump, and the air pipe communicates with the air chamber. A drive rod is rotatably mounted on the upper end of the valve stem, and the drive rod is vertically positioned and slides vertically within the air box, with the piston plate and drive rod fixedly connected.

[0019] Furthermore, a vacuum-resistant, zero-leakage, highly adjustable regulating valve also includes a second drive mechanism, which includes a handwheel. A first channel is formed on the gas box, the first channel is vertically arranged, and a drive rod is disposed within the first channel, with the drive rod and the first channel engaging in a helical transmission. The handwheel and the upper end of the drive rod are fixedly connected.

[0020] Furthermore, a limiting annular groove is formed on the peripheral wall of the valve stem, and the limiting annular groove is coaxially arranged with the valve stem. The sleeve includes two interlocking half-tubes. A limiting block is fixedly provided on the inner side of each half-tube, and the limiting block is rotatably disposed in the limiting annular groove.

[0021] Furthermore, a first sealing ring is provided at the connection between the outer bellows and the valve body. A second sealing ring is provided at the connection between the inner bellows and the sleeve.

[0022] The beneficial effects of this invention are as follows: This invention provides a vacuum-resistant, zero-leakage, highly adjustable regulating valve. Through a sealing mechanism, the lower ends of both the inner and outer bellows are fixedly connected to a connecting ring. When the valve stem moves downwards, the sleeve compresses the inner bellows, and the outer bellows extends. When the valve stem moves upwards, the sleeve stretches the inner bellows, and the outer bellows compresses.

[0023] Furthermore, during the up-and-down movement of the valve stem, both the inner and outer bellows tend to lengthen or shorten the valve stem's movement length. Therefore, under the action of the adjusting component, during the up-and-down movement of the valve stem, the adjusting component ensures that the changes in both the inner and outer bellows are less than the distance the valve stem moves up or down, thereby extending the service life of both the inner and outer bellows.

[0024] Because U-shaped bellows are highly durable when stretched, during valve stem movement, the elongation of the inner bellows exceeds its compression, and the elongation of the outer bellows exceeds its compression, further extending the service life of both the inner and outer bellows. Furthermore, it improves the durability of the outer and inner bellows without increasing their length or the length of the mounting cavity in the valve body, thus saving space and cost. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is a schematic diagram of a vacuum-resistant, zero-leakage, large-adjustable ratio regulating valve provided in an embodiment of the present invention;

[0027] Figure 2 is a cross-sectional view of a vacuum-resistant, zero-leakage, large adjustable ratio regulating valve provided in an embodiment of the present invention;

[0028] Figure 3 is a partial structural cross-sectional view of a vacuum-resistant, zero-leakage, large adjustable ratio regulating valve provided in an embodiment of the present invention;

[0029] Figure 4 is an enlarged view of point A in Figure 3;

[0030] Figure 5 is a partial structural cross-sectional view of the sealing mechanism of a vacuum-resistant, zero-leakage, large adjustable ratio regulating valve provided in an embodiment of the present invention;

[0031] Figure 6 is a partial structural schematic diagram of the sealing mechanism of a vacuum-resistant, zero-leakage, large adjustable ratio regulating valve provided in an embodiment of the present invention;

[0032] Figure 7 is a cross-sectional view of the structure in Figure 6;

[0033] Figure 8 is a cross-sectional view of the lifting diaphragm of a vacuum-resistant, zero-leakage, large adjustable ratio regulating valve provided in an embodiment of the present invention;

[0034] Figure 9 is a schematic diagram of the sleeve structure of a vacuum-resistant, zero-leakage, large adjustable ratio regulating valve provided in an embodiment of the present invention;

[0035] Figure 10 is a front view of the sleeve of a vacuum-resistant, zero-leakage, highly adjustable regulating valve provided in an embodiment of the present invention.

[0036] In the diagram: 100, valve body; 101, flow channel; 110, valve stem; 200, bracket; 300, air box; 310, piston plate; 320, spring; 330, drive rod; 400, handwheel; 601, outer bellows; 602, inner bellows; 603, lifting baffle; 604, first ring plate; 605, first damping cavity; 606, connecting pipe; 607, first slider; 608, second slider; 610, connecting ring; 620, sealing bellows; 630, upper damping bellows; 640, lower damping bellows; 700, sleeve; 701, first spiral groove; 702, second spiral groove; 703, third spiral groove; 800, connecting flange. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Referring to Figures 1 to 10, an embodiment of the present invention provides a vacuum-resistant, zero-leakage, highly adjustable regulating valve, comprising a valve body 100, a valve stem 110, and a sealing mechanism. The valve body 100 has an installation cavity and two flow channels 101. The installation cavity is vertically arranged, and the two flow channels 101 are sequentially distributed along a horizontal direction, communicating with each other. The valve stem 110 is vertically arranged and slidably disposed within the installation cavity.

[0039] The sealing mechanism includes an outer bellows 601, an inner bellows 602, a sleeve 700, and an adjusting assembly. The sleeve 700, inner bellows 602, and outer bellows 601 are all coaxially arranged with the valve stem 110, and the valve stem 110, sleeve 700, inner bellows 602, and outer bellows 601 are distributed along a direction from the inside out. The sleeve 700 and valve stem 110 are rotatably connected.

[0040] The upper end of the outer bellows 601 is fixedly connected to the valve body 100, and the lower end of the outer bellows 601 is fixedly provided with a connecting ring 610 coaxially arranged therewith. The connecting ring 610 is slidably disposed outside the sleeve 700. The upper end of the inner bellows 602 is fixedly provided with a connecting flange 800, which is coaxial with and fixedly connected to the valve stem 110. The lower end of the inner bellows 602 is fixedly connected to the connecting ring 610. Both the inner bellows 602 and the outer bellows 601 are U-shaped bellows, and the length and type of the inner bellows 602 and the outer bellows 601 are the same. U-shaped bellows have high durability when stretched.

[0041] In the initial state, the valve stem 110 partially blocks the flow channel 101, and the upper ends of the outer bellows 601 and inner bellows 602 are flush. When the valve stem 110 moves downward, the sleeve 700 compresses the inner bellows 602, and the outer bellows 601 extends. When the valve stem 110 moves upward, the sleeve 700 stretches the inner bellows 602, and the outer bellows 601 is compressed.

[0042] The adjusting assembly ensures that the changes in both the inner bellows 602 and the outer bellows 601 are less than the distance the valve stem 110 moves upward or downward. Furthermore, during the up-and-down movement of the valve stem 110, the elongation of the inner bellows 602 is greater than its compression, and the elongation of the outer bellows 601 is greater than its compression, thus extending the service life of both the outer bellows 601 and the inner bellows 602.

[0043] Since the lower ends of both the inner bellows 602 and the outer bellows 601 are fixedly connected to the connecting ring 610, when the valve stem 110 moves downward, the sleeve 700 compresses the inner bellows 602 and stretches the outer bellows 601. When the valve stem 110 moves upward, the sleeve 700 stretches the inner bellows 602 and compresses the outer bellows 601.

[0044] Furthermore, during the up-and-down movement of the valve stem 110, the inner bellows 602 tends to lengthen or shorten the distance the valve stem 110 moves, and the outer bellows 601 also tends to lengthen or shorten the distance the valve stem 110 moves. Therefore, under the action of the adjusting component, during the up-and-down movement of the valve stem 110, the adjusting component ensures that the changes in the inner bellows 602 and the outer bellows 601 are both less than the distance the valve stem 110 moves upward or downward, thereby extending the service life of the outer bellows 601 and the inner bellows 602.

[0045] Because the U-shaped bellows are highly durable when stretched, during the movement of the valve stem 110, the elongation of the inner bellows 602 is greater than its compression, and the elongation of the outer bellows 601 is greater than its compression, further extending the service life of the outer bellows 601 and the inner bellows 602. Furthermore, it improves the durability of the outer bellows 601 and the inner bellows 602 without increasing the length of the outer bellows 601 and the inner bellows 602, or the length of the mounting cavity in the valve body 100, thereby saving space and cost.

[0046] In this embodiment, a first helical groove 701 is formed within the mounting cavity, and the first helical groove 701 and the sleeve 700 are coaxially arranged. A second helical groove 702 and a third helical groove 703, which communicate with each other, are formed on the lower peripheral wall of the sleeve 700. The second helical groove 702 and the third helical groove 703 are coaxially arranged with the sleeve 700, and the second helical groove 702 is located above the third helical groove 703. The pitch of the second helical groove 702 is smaller than the pitch of the third helical groove 703, and the unfolded length of the helix of the second helical groove 702 is the same as the unfolded length of the helix of the third helical groove 703. Furthermore, the sum of the pitches of the second helical groove 702 and the third helical groove 703 is half the pitch of the first helical groove 701. The adjustment assembly includes a first slider 607 and a second slider 608. The first slider 607 is fixedly mounted on the sleeve 700. The first slider 607 is slidably disposed within the first helical groove 701.

[0047] As shown in Figure 3, when the valve stem 110 moves up and down, it drives the sleeve 700 to move up and down. When the sleeve 700 moves up and down, it drives the first slider 607 to move synchronously. With the cooperation of the first slider 607 and the first spiral groove 701, the sleeve 700 rotates.

[0048] The second slider 608 is fixedly disposed inside the connecting ring 610. The second slider 608 is slidably disposed within the second spiral groove 702 or the third spiral groove 703. Initially, the second slider 608 is located at the junction of the second spiral groove 702 and the third spiral groove 703. The groove width at the junction of the second spiral groove 702 and the third spiral groove 703 is greater than the width of the second slider 608, facilitating the passage of the second slider 608 through the junction of the second spiral groove 702 and the third spiral groove 703.

[0049] During the movement of the valve stem 110, with the cooperation of the second slider 608, the second spiral groove 702, and the third spiral groove 703, the elongation of the inner bellows 602 is greater than its compression, and the elongation of the outer bellows 601 is greater than its compression.

[0050] In this embodiment, a vacuum-resistant, zero-leakage, highly adjustable regulating valve further includes a lifting baffle 603, which is disposed between the outer bellows 601 and the inner bellows 602. The lower end of the lifting baffle 603 abuts against the connecting ring 610. The lifting baffle 603 supports the outer bellows 601 and the inner bellows 602, preventing axial bending of the outer bellows 601 and the inner bellows 602, thereby further extending the service life of the outer bellows 601 and the inner bellows 602.

[0051] In this embodiment, a sealing bellows 620 is sleeved on the outside of the lifting baffle 603. The sealing bellows 620 is located at the upper part of the lifting baffle 603 and is located in the mounting cavity. The sealing bellows 620 connects the lifting baffle 603 and the valve body 100.

[0052] In this embodiment, a first annular groove is formed on the inner wall of the mounting cavity. The first annular groove and the lifting baffle 603 are coaxially arranged, and a first damping cavity 605 is formed between the first annular groove and the lifting baffle 603. The first damping cavity 605 contains damping fluid. A first annular plate 604 is fixedly arranged on the outer peripheral wall of the lifting baffle 603. The first annular plate 604 is coaxially arranged with the lifting baffle 603 and is slidably disposed in the first damping cavity 605 to reduce the vibration caused by water flow impact on the lifting baffle 603.

[0053] In this embodiment, a vacuum-resistant, zero-leakage, highly adjustable regulating valve further includes a connecting pipe 606. The connecting pipe 606 is slidably sleeved on the outside of the sleeve 700, located above the inner bellows 602, and fixedly connected to the upper side of the inner bellows 602. A first retaining ring, a second retaining ring, and a third retaining ring are sequentially fixedly arranged on the outer peripheral wall of the connecting pipe 606 from top to bottom. The first, second, and third retaining rings are all coaxially arranged with the connecting pipe 606. The connecting pipe 606 is located inside the lifting baffle 603, and the second retaining ring is fixedly connected to the lifting baffle 603.

[0054] An upper damping bellows 630 and a lower damping bellows 640 are sleeved on the outer side of the connecting pipe 606. The upper damping bellows 630 connects the first retaining ring and the second retaining ring, and the lower damping bellows 640 connects the second retaining ring and the third retaining ring. Damping fluid is provided between the upper damping bellows 630 and the connecting pipe 606, and between the lower damping bellows 640 and the connecting pipe 606, to reduce the vibration caused by water flow impact on the inner bellows 602.

[0055] In this embodiment, a vacuum-resistant, zero-leakage, highly adjustable regulating valve further includes a first driving mechanism, which comprises an air box 300, an air pump, a piston plate 310, and multiple springs 320. A bracket 200 is fixedly mounted on the valve body 100. The air box 300 is fixedly mounted on the bracket 200. The piston plate 310 is horizontally positioned and slides vertically within the air box 300, forming an air chamber in the space below the piston plate 310. An air pipe is mounted on the air pump, communicating with the air chamber. Springs 320 connect the upper side of the piston plate 310 to the air box 300. A drive rod 330 is rotatably mounted on the upper end of the valve stem 110. The drive rod 330 is vertically positioned and slides vertically within the air box 300, with the piston plate 310 and the drive rod 330 fixedly connected.

[0056] When the air pump is turned on, gas is introduced into the air chamber. The gas pushes the piston plate 310 upward, which in turn drives the drive rod 330 upward, thereby causing the valve stem 110 to move upward. When the air pump is turned off, under the action of the spring 320, the piston plate 310 moves downward, which in turn drives the drive rod 330 downward, thereby causing the valve stem 110 to move downward.

[0057] In this embodiment, a vacuum-resistant, zero-leakage, highly adjustable regulating valve further includes a second drive mechanism, which includes a handwheel 400. A first channel is formed on the gas box 300, the first channel being vertically arranged. A drive rod 330 is disposed within the first channel, and the drive rod 330 and the first channel are engaged in a helical transmission. The upper ends of the handwheel 400 and the drive rod 330 are fixedly connected.

[0058] Rotating the handwheel 400 causes the drive rod 330 to rotate. The drive rod 330 is screwed into the first channel. As the drive rod 330 rotates, it moves downward, causing the valve stem 110 to move downward as well. The downward movement of the valve stem 110 gradually blocks the two flow channels 101.

[0059] In this embodiment, a limiting annular groove is formed on the peripheral wall of the valve stem 110, and the limiting annular groove and the valve stem 110 are coaxially arranged. The sleeve 700 includes two interlocking half-tubes. A limiting block is fixedly provided on the inner side of each half-tube, and the limiting block is rotatably disposed in the limiting annular groove. The two interlocking half-tubes facilitate installation on the valve stem 110.

[0060] In this embodiment, a first sealing ring is provided at the connection between the outer bellows 601 and the valve body 100. A second sealing ring is provided at the connection between the inner bellows 602 and the sleeve 700.

[0061] Working process: In the initial state, the valve stem 110 blocks part of the flow channel 101, and the second slider 608 is located at the junction of the second spiral groove 702 and the third spiral groove 703. The length by which the valve stem 110 moves downward to block both flow channels 101 and the length by which the valve stem 110 moves upward to fully open both flow channels 101 are both first preset values, and the first preset value is half of the pitch of the first spiral groove 701.

[0062] When it is necessary to block the flow channel 101, turn the handwheel 400. The handwheel 400 drives the drive rod 330 to rotate. The drive rod 330 is screwed into the first channel. When the drive rod 330 rotates, it moves downward, which in turn drives the valve stem 110 to move downward. The downward movement of the valve stem 110 gradually blocks both flow channels 101.

[0063] When the valve stem 110 moves downward, it causes the upper end of the inner bellows 602 to move downward as well. Since the lower ends of both the inner bellows 602 and the outer bellows 601 are fixedly connected to the connecting ring 610, the inner bellows 602 tends to compress by a first preset value, while the outer bellows 601 tends to elongate by a first preset value. Because the lower ends of both the inner and outer bellows 602 are fixedly connected to the connecting ring 610, the sum of the compression of the inner bellows 602 and the elongation of the outer bellows 601 equals the first preset value.

[0064] Furthermore, as the valve stem 110 moves downward, the sleeve 700 rotates due to the engagement of the first slider 607 and the first helical groove 701. As shown in Figures 4 and 10, the sleeve 700 rotates clockwise. When the valve stem 110 moves downward, the second slider 608 moves upward relative to the valve body 100, thus entering the second helical groove 702. As the second slider 608 slides within the second helical groove 702, the inner bellows 602 is compressed. Simultaneously, the connecting ring 610 pulls the lower end of the outer bellows 601 downward, causing it to extend.

[0065] Since the sum of the pitches of the second spiral groove 702 and the third spiral groove 703 is half that of the first spiral groove 701, that is, the sum of the pitches of the second spiral groove 702 and the third spiral groove 703 is the first preset value, the compression of the inner bellows 602 is less than the first preset value, and the elongation of the outer bellows 601 is less than the first preset value.

[0066] Furthermore, since the spiral unfolding length of the second spiral groove 702 is the same as that of the third spiral groove 703, and the pitch of the second spiral groove 702 is smaller than that of the third spiral groove 703, the compression of the inner bellows 602 is smaller than the elongation of the outer bellows 601.

[0067] The compression of the inner bellows 602 is less than a first preset value, and the elongation of the outer bellows 601 is less than a first preset value. By reducing the changes in the outer bellows 601 and the inner bellows 602, the service life of the outer bellows 601 and the inner bellows 602 is extended. Since the inner bellows 602 and the outer bellows 601 are U-shaped bellows, and U-shaped bellows have high durability when stretched, the elongation of the outer bellows 601 is greater than the compression of the inner bellows 602, thus further extending the service life of the outer bellows 601 and the inner bellows 602.

[0068] When the flow channel 101 needs to be fully opened, the valve stem 110 moves upward, causing the upper end of the inner bellows 602 to move upward. The inner bellows 602 tends to stretch by a first preset value, while the outer bellows 601 tends to compress by a first preset value. The sum of the elongation of the inner bellows 602 and the compression of the outer bellows 601 is equal to the first preset value.

[0069] As the valve stem 110 moves upward, it rotates. With the cooperation of the first slider 607 and the first helical groove 701, as shown in Figures 4 and 10, the sleeve 700 rotates counterclockwise. As the valve stem 110 moves upward, the second slider 608 moves downward relative to the valve stem 110, thus entering the third helical groove 703. When the second slider 608 slides within the third helical groove 703, the inner bellows 602 extends. Simultaneously, the connecting ring 610 pulls the lower end of the outer bellows 601 downward.

[0070] With the cooperation of the second slider 608 and the third spiral groove 703, the elongation of the inner bellows 602 is less than the first preset value, and the compression of the outer bellows 601 is less than the first preset value, thereby extending the service life of the outer bellows 601 and the inner bellows 602. Furthermore, the elongation of the inner bellows 602 is greater than the compression of the outer bellows 601, further extending the service life of both the outer bellows 601 and the inner bellows 602.

[0071] Therefore, since the sum of the pitches of the second spiral groove 702 and the third spiral groove 703 is half that of the first spiral groove 701, and the spiral unfolded lengths of the second spiral groove 702 and the third spiral groove 703 are the same, the pitch of the second spiral groove 702 is less than that of the third spiral groove 703. Thus, the elongation of the inner bellows 602 is greater than its compression, and the elongation of the outer bellows 601 is greater than its compression, thereby extending the service life of both the outer bellows 601 and the inner bellows 602.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vacuum-resistant, zero-leakage, highly adjustable regulating valve, characterized in that: It includes a valve body, a valve stem, and a sealing mechanism; the valve body has an installation cavity and two flow channels communicating with the installation cavity; the valve stem is vertically arranged and slidably disposed in the installation cavity; The sealing mechanism includes an outer bellows, an inner bellows, a sleeve, and an adjusting assembly; the sleeve, inner bellows, and outer bellows are all coaxially arranged with the valve stem, and the valve stem, sleeve, inner bellows, and outer bellows are distributed in a direction from the inside to the outside; the sleeve and the valve stem are rotatably connected; the upper end of the outer bellows is connected to the valve body, and a connecting ring is provided at the lower end of the outer bellows; the connecting ring is slidably disposed outside the sleeve; the upper end of the inner bellows is connected to the valve stem, and the lower end of the inner bellows is connected to the connecting ring; both the inner and outer bellows are U-shaped bellows. The mounting cavity has a first spiral groove, and the lower peripheral wall of the sleeve has a second spiral groove and a third spiral groove that are interconnected. The second spiral groove is located above the third spiral groove. The pitch of the second spiral groove is smaller than the pitch of the third spiral groove. The spiral length of the second spiral groove is the same as the spiral length of the third spiral groove. The sum of the pitches of the second spiral groove and the third spiral groove is half the pitch of the first spiral groove. The adjustment assembly includes a first slider and a second slider. The first slider is fixedly mounted on the sleeve and slidably mounted in the first spiral groove. The second slider is fixedly mounted inside the connecting ring and slidably mounted in the second or third spiral groove. In the initial state, the second slider is located at the junction of the second and third spiral grooves. In the initial state, the valve stem partially blocks the flow channel, and the upper ends of the outer and inner bellows are flush. When the valve stem moves downward, the inner bellows compresses and the outer bellows extends. When the valve stem moves upward, the inner bellows stretches and the outer bellows compresses. The adjusting component ensures that the changes in the inner and outer bellows are both less than the distance the valve stem moves upward or downward. Furthermore, during the movement of the valve stem, the elongation of the inner bellows is greater than its compression, and the elongation of the outer bellows is greater than its compression, thereby extending the service life of both the outer and inner bellows.

2. The vacuum-resistant, zero-leakage, highly adjustable regulating valve according to claim 1, characterized in that: It also includes a lifting baffle, which is set between the outer corrugated pipe and the inner corrugated pipe; the lower end of the lifting baffle abuts against the connecting ring; the lifting baffle is used to support the outer corrugated pipe and the inner corrugated pipe.

3. The vacuum-resistant, zero-leakage, highly adjustable regulating valve according to claim 2, characterized in that: A sealing bellows is fitted around the outside of the lifting baffle, which is located at the top of the lifting baffle and connects the lifting baffle and the valve body.

4. The vacuum-resistant, zero-leakage, highly adjustable regulating valve according to claim 2, characterized in that: A first annular groove is formed on the inner wall of the mounting cavity, and a first damping cavity is formed between the first annular groove and the lifting baffle tube. The first damping cavity contains damping fluid. A first annular plate is provided on the outer peripheral wall of the lifting baffle tube. The first annular plate is slidably disposed in the first damping cavity to reduce the vibration caused by water flow impact on the lifting baffle tube.

5. A vacuum-resistant, zero-leakage, highly adjustable regulating valve according to claim 2, characterized in that: It also includes a connecting pipe, which is slidably fitted onto the outside of the sleeve, and the upper side of the connecting pipe is fixedly connected to the inner corrugated pipe; a first retaining ring, a second retaining ring and a third retaining ring are fixedly installed on the outer peripheral wall of the connecting pipe from top to bottom; the connecting pipe is located inside the lifting partition, and the second retaining ring is fixedly connected to the lifting partition. An upper damping bellows and a lower damping bellows are fitted on the outside of the connecting pipe. The upper damping bellows connects to the first retaining ring and the second retaining ring, and the lower damping bellows connects to the second retaining ring and the third retaining ring. Damping fluid is provided between the upper damping bellows and the connecting pipe, as well as between the lower damping bellows and the connecting pipe, to reduce the vibration caused by water flow impact on the inner bellows.

6. The vacuum-resistant, zero-leakage, highly adjustable regulating valve according to claim 1, characterized in that: It also includes a first driving mechanism, which includes an air box, an air pump, and a piston plate; the air box is disposed on the valve body; the piston plate is horizontally disposed and slides up and down in the air box, and the space on the lower side of the piston plate forms an air chamber; an air pipe is disposed on the air pump and the air pipe is connected to the air chamber; a drive rod is rotatably disposed on the upper end of the valve stem, the drive rod is vertically disposed and slides up and down in the air box, and the piston plate and the drive rod are fixedly connected.

7. A vacuum-resistant, zero-leakage, highly adjustable regulating valve according to claim 6, characterized in that: It also includes a second drive mechanism, which includes a handwheel; a first channel is opened on the air box, the first channel is vertically arranged, the drive rod is arranged in the first channel, and the drive rod and the first channel are screw-driven; the upper end of the handwheel and the drive rod are fixedly connected.

8. A vacuum-resistant, zero-leakage, highly adjustable regulating valve according to claim 1, characterized in that: A limiting annular groove is formed on the peripheral wall of the valve stem, and the limiting annular groove is coaxially arranged with the valve stem; the sleeve includes two interlocking half tubes; a limiting block is fixedly arranged on the inner side of each half tube, and the limiting block is rotatably arranged in the limiting annular groove.

9. A vacuum-resistant, zero-leakage, highly adjustable regulating valve according to claim 1, characterized in that: A first sealing ring is provided at the connection between the outer bellows and the valve body; a second sealing ring is provided at the connection between the inner bellows and the sleeve.

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