Corrugated pipe regulating valve

Abstract

The utility model discloses a corrugated pipe adjusting valve, relates to the technical field of adjusting valves, and relieves pressure impact of media on a corrugated pipe. An inner cavity is formed in the valve cover, the bottom of the valve cover is provided with an annular step structure protruding towards the inner cavity, the annular step structure is located at the inlet and outlet position of the bottom of the inner cavity, the annular step structure comprises at least one first step and at least one second step, and the first steps and the second steps are alternately arranged in the height direction of the inner cavity in a spaced mode. The second step is closer to the valve rod than the first step so as to form a gap for a medium to pass through between the first step and the valve rod, a plurality of through holes for the medium to pass through are annularly formed in the inner ring of the second step, and the adjacent gaps and the through holes are alternately distributed. The flow path of the medium continuously turns, collides and flows, the turning and collision times of the medium are increased, the flow path of the medium in the inner cavity is prolonged, pressure fluctuation is gradually attenuated in the propagation process, pressure impact of the medium is effectively buffered, and instantaneous impact on the outer wall of the corrugated pipe is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, in particular to a bellows regulating valve. Background Art

[0002] Nowadays, bellows regulating valve is a fluid control device widely used in industrial fields such as petroleum, chemical, electric power, and pharmaceutical. It is mainly used to adjust and control parameters such as flow, pressure, and temperature of fluid media. The core components of the bellows regulating valve include valve body, bellows, valve stem, valve core, and valve cover. The bellows, as a key elastic sealing element, directly bears the medium pressure and ensures the sealing and regulating performance of the valve. However, in actual applications, due to factors such as pressure fluctuations and high-speed flow of the medium, the medium will produce a large pressure shock to the bellows when entering the bellows chamber through the valve cover, and the pressure shock of the medium acts on the outer wall of the bellows almost without any buffering. However, due to the limitations of the material properties of the bellows, the maximum working pressure it can withstand is limited. The pressure shock of the medium not only causes the bellows to deform and increase the wear of the bellows, but also easily causes fatigue damage to the bellows and reduced sealing performance under long-term action, and even causes valve failure, which seriously affects the safety and reliability of the equipment. Utility Model Content

[0003] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a bellows regulating valve, which effectively alleviates the pressure impact of the medium on the bellows and improves the reliability and stability of the bellows regulating valve.

[0004] The technical solution of the utility model comprises a valve cover, a valve stem, a valve body, a compression sleeve and a bellows, the valve cover is fixedly installed on the top of the valve body, the compression sleeve is fixedly installed in the valve body, the valve stem movably passes through the valve cover and the compression sleeve, the bellows is outermostly arranged outside the valve stem and the bottom end of the bellows is fixedly connected to the valve stem, an inner cavity is formed in the valve cover, a ring step structure protruding toward the inner cavity is arranged at the bottom of the valve cover, the ring step structure is located at the inlet and outlet positions of the bottom of the inner cavity, the ring step structure comprises at least one first step and at least one second step, the first step and the second step are alternately spaced and arranged along the height direction of the inner cavity; the second step is closer to the valve stem than the first step to form a gap between the first step and the valve stem for medium to pass through, a plurality of through holes for medium to pass through are arranged in the inner ring of the second step, and adjacent gaps and through holes are alternately distributed.

[0005] By adopting the above technical solution, through the annular step structure alternately distributed in the valve cover, the medium flows alternately along the radial and axial directions of the valve cover when flowing into the inner cavity, and the flow path of the medium constantly turns and collides. The number of medium turns and collisions increases, and the flow path of the medium in the inner cavity is extended, so that the pressure fluctuation is gradually attenuated during the propagation process, effectively buffering the pressure shock of the medium and reducing the instantaneous impact on the outer wall of the bellows, thereby reducing the wear and fatigue damage risk of the bellows.

[0006] In a possible design, a top hole penetrating the inner cavity and the valve body is provided in the pressing sleeve, the pressing sleeve is located below the first step, and the top hole is staggered with the interval.

[0007] The above design can further optimize the medium flow path, ensure that the medium is fully buffered and dispersed before entering the bellows chamber, avoid concentrated pressure from damaging the bellows, and further improve the durability of the valve.

[0008] In a possible design, a base is provided at the bottom end of the bellows, and a side surface of the base forms a guiding slope that slopes outward from the bottom.

[0009] The above design helps the medium to flow around the bellows more smoothly, reduces the direct impact force of the medium on the bottom of the bellows when flowing, and reduces the risk of damage to the bottom of the bellows due to local high pressure.

[0010] In a possible design, a plurality of sawtooth-shaped sharp edges are arranged on the inner wall of the inner cavity, and the sharp edges are arranged along the height direction of the inner cavity.

[0011] With the above design, the sharp-angled ring edge increases the friction resistance during the flow of the medium, slowing down the speed of the medium when passing through, thereby achieving further pressure reduction. In addition, the serrated design can also help break up the medium flow, making it more evenly distributed and reducing local impact on the bellows.

[0012] In a possible design, the first step and the second step are respectively connected integrally with the valve cover.

[0013] With the above design, the integrated connection ensures that the ring step structure is not easily deformed or damaged during long-term use, and also simplifies the manufacturing process, which is conducive to reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the utility model;

[0015] Figure 2 For this utility model Figure 1 A partial enlarged view of the middle A;

[0016] Figure 3 For this utility model Figure 2 Schematic diagram of medium flow path;

[0017] Among them, 1. valve cover; 11. inner cavity; 12. sharp-angled ring edge; 2. valve stem; 3. valve body; 4. pressing sleeve; 41. top hole; 5. bellows; 51. base; 52. guide slope; 6. ring step structure; 61. first step; 62. second step; 63. interval; 64. through hole. DETAILED DESCRIPTION

[0018] like Figures 1 to 3 The bellows regulating valve shown in the figure comprises a valve cover 1, a valve stem 2, a valve body 3, a compression sleeve 4 and a bellows 5. The valve cover 1 is fixedly installed on the top of the valve body 3, the compression sleeve 4 is fixedly installed in the valve body 3, the valve stem 2 is movable through the valve cover 1 and the compression sleeve 4, the bellows 5 is sleeved outside the valve stem 2 and the bottom end of the bellows 5 is welded and fixed to the valve stem 2. An inner cavity 11 is formed in the valve cover 1, and the bellows 5 is actually placed in the inner cavity 11. The bottom of the valve cover 1 is provided with an annular step structure 6 protruding toward the inner cavity 11, and the annular step structure 6 is located at the inlet and outlet position of the bottom of the inner cavity 11. The annular step structure 6 includes two first steps 61 and one second step 62, and the first step 61 and the second step 62 are alternately arranged and separated along the height direction of the inner cavity 11, that is, the first step 61 and the second step 62 appear alternately along the height direction of the inner cavity 11. The second step 62 is closer to the valve stem 2 than the first step 61, so that a gap 63 for the medium to pass through is formed between the first step 61 and the valve stem 2. The second step 62 is provided with a plurality of through holes 64 for the medium to pass through in the inner ring, and the adjacent gaps 63 and through holes 64 are arranged in an alternating manner. When the medium enters the inner cavity 11 of the valve cover 1, the ring step structure 6 forces the medium to flow alternately. The medium will undergo multiple turns and collisions and cannot rush to the outer wall of the bellows 5 in a straight line and without hindrance. In this way, the flow path of the medium is changed. Each turn consumes the kinetic energy of the medium, disrupting the flow state of the medium that may tend to concentrate on impacting the bellows 5, allowing the medium to disperse through the gap 63 and through hole 64, avoiding excessive local pressure, and then the pressure is dispersed and reduced, effectively buffering the flow rate and pressure of the medium, reducing the direct impact on the bellows 5, protecting the bellows 5, and improving the overall reliability of the regulating valve.

[0019] The compression sleeve 4 is provided with a top hole 41 that passes through the inner cavity 11 and the valve body 3. The compression sleeve 4 is located below the first step 61, and the top hole 41 is staggered with the interval 63. The medium in the valve body 3 enters the inner cavity 11 from the top hole 41. When the medium enters the inner cavity 11, it is forced to turn and flow to the inner cavity 11, further dispersing the pressure, guiding the medium to form a non-straight flow path, and reducing the turbulence intensity.

[0020] The bottom end of the bellows 5 is provided with a base 51, and the side of the base 51 forms a guiding slope 52 that tilts from the bottom to the outside. When a small amount of medium may rush to the bottom of the bellows 5, the guiding slope 52 can guide the medium to flow smoothly along the guiding slope 52, and assist the medium to flow smoothly into the peripheral chamber of the bellows 5, and disperse the impact force of the medium along the guiding slope 52 to the inner wall of the impact valve cover 1, so as to avoid the accumulation of the medium at the bottom of the bellows 5 to form a high-pressure area to impact or erode the bellows 5, which not only protects the bottom structural integrity of the bellows 5, but also prevents the bottom medium accumulation from affecting the sealing of the connection between the valve stem 2 and the bellows 5, and maintains the good sealing and regulating performance of the regulating valve.

[0021] A plurality of sawtooth-shaped sharp edges 12 are arranged on the inner wall of the inner cavity 11, and the sharp edges 12 are arranged along the height direction of the inner cavity 11. When the medium flows in the inner cavity 11, it encounters these sharp edges 12, which cut and turn the medium flow multiple times, which will produce additional turbulence effects, further consume the kinetic energy of the medium, disrupt the orderly flow of the medium, strengthen the protection of the bellows 5, and disperse the pressure fluctuations through the sharp edges 12, reduce the probability of cavitation, and extend the service life of the valve and the bellows 5. In addition, the sharp edges 12 and the ring step structure 6 make the path for the medium to enter the inner cavity 11 more complicated, increase the resistance when the medium enters the inner cavity, and thus reduce the medium pressure when it reaches the bellows. However, since it only affects the flow of the medium at the position of the inner cavity 11, the normal function of the medium in the valve body 3 is less affected, and therefore, the impact on the overall opening and closing of the valve is minimal.

[0022] The first step 61 and the second step 62 are respectively connected to the valve cover 1 in one piece, ensuring the integrity and stability of the ring step structure 6. Under harsh working conditions such as high pressure, high temperature and frequent medium impact, the integrally connected structure will not have problems such as loosening or falling off of the connection parts, so that the ring step structure 6 can continuously and reliably play the buffering and decompression function, and improve the overall rigidity of the ring step structure 6.

Claims

1. A bellows regulating valve, comprising a valve cover (1), a valve stem (2), a valve body (3), a compression sleeve (4) and a bellows (5), wherein the valve cover (1) is fixedly mounted on the top of the valve body (3), the compression sleeve (4) is fixedly mounted in the valve body (3), the valve stem (2) movably passes through the valve cover (1) and the compression sleeve (4), the bellows (5) is sleeved outside the valve stem (2) and the bottom end of the bellows (5) is fixedly connected to the valve stem (2), characterized in that: An inner cavity (11) is formed in the valve cover (1), and a ring step structure (6) protruding toward the inner cavity (11) is provided at the bottom of the valve cover (1), and the ring step structure (6) is located at the inlet and outlet of the bottom of the inner cavity (11), and the ring step structure (6) comprises at least one first step (61) and at least one second step (62), and the first step (61) and the second step (62) are alternately arranged in a spaced relationship along the height direction of the inner cavity (11); The second step (62) is closer to the valve stem (2) than the first step (61) to form a gap (63) between the first step (61) and the valve stem (2) for medium to pass through. The second step (62) is provided with a plurality of through holes (64) in an inner ring for medium to pass through. Adjacent gaps (63) and through holes (64) are arranged in an alternating manner.

2. The bellows regulating valve according to claim 1, characterized in that: The pressing sleeve (4) is provided with a top hole (41) penetrating the inner cavity (11) and the valve body (3); the pressing sleeve (4) is located below the first step (61); and the top hole (41) and the interval (63) are arranged in a staggered manner.

3. The bellows regulating valve according to claim 1 or 2, characterized in that: A base (51) is provided at the bottom end of the corrugated tube (5), and a side surface of the base (51) forms a guiding inclined surface (52) inclined from the bottom outwards.

4. The bellows regulating valve according to claim 1 or 2, characterized in that: A plurality of sawtooth-shaped sharp-angled edges (12) are arranged on the inner wall of the inner cavity (11), and the sharp-angled edges (12) are arranged along the height direction of the inner cavity (11).

5. The bellows regulating valve according to claim 1 or 2, characterized in that: The first step (61) and the second step (62) are respectively connected integrally to the valve cover (1).

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