A pressure reducing sleeve assembly and pressure reducing valve

Abstract

This invention relates to a pressure reducing valve, specifically a pressure reducing sleeve assembly and a pressure reducing valve, comprising an inner sleeve and an outer sleeve coaxially fitted together, forming an annular mounting cavity between the inner sleeve and the outer sleeve. At least two spacer rings are spaced apart along their axial direction within the annular mounting cavity, forming an annular partition between adjacent spacer rings. Two adjusting rings are spaced apart along their axial direction within the annular partition, forming an annular expansion cavity between the two adjusting rings. A vent hole communicating with the annular expansion cavity is penetrating through the side wall of the inner sleeve, and an exhaust hole communicating with the annular expansion cavity is penetrating through the side wall of the outer sleeve. The two adjusting rings can move away from or closer to each other along the axis of the annular expansion cavity to adjust its size. This invention, through the rotational movement of the inner sleeve, can simultaneously achieve dual adjustment of the expansion cavity volume and the intake airflow, thereby adapting to abnormal fluctuations in intake pressure and improving the pressure reducing effect and emission efficiency at the pressure reducing valve outlet.

Description

Technical Field

[0001] This invention relates to a pressure reducing valve, specifically a pressure reducing sleeve assembly and a pressure reducing valve. Background Technology

[0002] Pressure reducing valves typically consist of three main parts: valve body, valve core assembly, and pressure reducing sleeve assembly. They are mainly used for gas pressure regulation under high pressure differential conditions. The valve body provides a flow channel for gas, the valve core assembly regulates the gas flow rate into the pressure reducing sleeve assembly, and the pressure reducing sleeve assembly performs the pressure reduction function.

[0003] In the prior art, the pressure-reducing sleeve assembly consists of at least two coaxially fitted sleeves, with multiple vent holes penetrating the sidewalls of each sleeve, and an annular expansion chamber formed between the two sleeves. High-pressure gas, after being regulated by the valve core assembly, enters the innermost sleeve and then flows into the annular expansion chamber through the vent holes, where it undergoes expansion, thereby reducing the gas pressure.

[0004] However, in practical applications, the inlet pressure of the pressure-reducing sleeve assembly often fluctuates abnormally due to changes in conveying distance, equipment start-up and shutdown, and other factors. When the inlet pressure suddenly drops from the normal range to a low pressure, the gas entering the fixed-volume annular expansion chamber causes excessive diffusion, resulting in a slower outlet flow rate and affecting gas conveying efficiency. If the size of the annular expansion chamber is designed to accommodate low-pressure inlet conditions, insufficient pressure reduction can easily occur when the inlet pressure suddenly rises from the normal range to a high pressure, due to the limited expansion space provided by the annular expansion chamber. To address these issues, we propose a pressure-reducing sleeve assembly and pressure-reducing valve to effectively solve these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a pressure-reducing sleeve assembly and a pressure-reducing valve to solve the problem mentioned in the background art that the volume of the expansion chamber is fixed and cannot adapt to abnormal fluctuations in intake pressure.

[0006] This invention is achieved through the following technical solution: a pressure-reducing sleeve assembly, comprising an inner sleeve and an outer sleeve coaxially fitted together. The top of the inner sleeve has an air inlet. An annular mounting cavity is formed between the inner sleeve and the outer sleeve. At least two spacer rings are spaced apart along their axial direction within the annular mounting cavity, forming an annular partition between adjacent spacer rings. Two adjusting rings are spaced apart along their axial direction within the annular partition, forming an annular expansion cavity between the two adjusting rings. A vent hole communicating with the annular expansion cavity is penetrating through the side wall of the inner sleeve, and an exhaust hole communicating with the annular expansion cavity is penetrating through the side wall of the outer sleeve. The inner sleeve and the outer sleeve are rotatably connected. The inner sleeve is capable of rotating around its own axis. A linkage-type spacing adjustment structure is provided between the inner sleeve and the two adjusting rings. When the inner sleeve rotates clockwise or counterclockwise around its own axis, the linkage-type spacing adjustment structure drives the two adjusting rings to move away from or closer to each other, thereby adjusting the size of the annular expansion cavity.

[0007] In one embodiment, a retaining ring is fixed between the opposite ends of the two spacer rings. The inner peripheral wall of the retaining ring is movably fitted with the outer peripheral wall of the inner sleeve, and the outer peripheral wall of the retaining ring is movably fitted with the inner peripheral wall of each adjusting ring. An adjusting hole corresponding to the vent hole is provided on the side wall of the retaining ring. When the inner sleeve rotates clockwise or counterclockwise around its own axis, the degree of alignment and overlap between the vent hole and the adjusting hole can be adjusted.

[0008] In one embodiment, both the adjustment hole and the vent hole are arc-shaped through holes, and the arc length of the adjustment hole is greater than the arc length of the vent hole.

[0009] In one embodiment, the linkage spacing adjustment structure includes a slide rod fixed to the inner peripheral wall of each adjustment ring, and the outer peripheral wall of the inner sleeve is provided with a spiral groove corresponding to each slide rod. The end of each slide rod away from the adjustment ring is slidably embedded in the corresponding spiral groove; the spiral grooves corresponding to the two adjustment rings rotate in opposite directions.

[0010] In one embodiment, at least three slide rods are provided on the inner peripheral wall of the adjusting ring, and the three slide rods are distributed at equal intervals along the inner peripheral wall of the adjusting ring.

[0011] In one embodiment, the slide bar includes a fixed section and a rotating section; the fixed section is fixedly connected to the inner peripheral wall of the adjusting ring, and the rotating section is rotatably connected to the fixed section and slidably embedded in the spiral groove.

[0012] In one embodiment, the outer peripheral wall of the spacer ring is fixedly connected to the inner peripheral wall of the outer sleeve, and the inner peripheral wall of the spacer ring is movably fitted to the outer peripheral wall of the inner sleeve.

[0013] In one embodiment, a sealing ring is fixedly embedded in the inner peripheral wall of the spacer ring, and the sealing ring abuts against the outer peripheral wall of the inner sleeve.

[0014] The present invention also provides a pressure reducing valve, including the pressure reducing sleeve assembly as described above, and a valve body, wherein the valve body is provided with an air inlet, an air outlet and a valve core assembly; the valve core assembly is located between the air inlet and the pressure reducing sleeve assembly.

[0015] In one embodiment, the outer sleeve is detachably fixed to the valve body, and a sealing ring is provided at the junction of the valve body and the outer sleeve.

[0016] Compared with the prior art, the present invention provides a pressure-reducing sleeve assembly and a pressure-reducing valve, which have the following beneficial effects: 1. The two adjusting rings of the present invention can be far apart or close together, thereby adjusting the size of the annular expansion chamber according to the intake pressure, so that the size of the annular expansion chamber is directly proportional to the intake pressure, which is beneficial to simultaneously taking into account gas emission efficiency and pressure reduction effect.

[0017] 2. The size of the annular expansion cavity can be adjusted simply by rotating the inner sleeve. The structure is simple and compact, and there is no need to add a complex drive structure, which can reduce the probability of maintenance.

[0018] 3. During the rotation of the inner sleeve, the degree of overlap between the adjustment hole and the vent hole can be changed, so that the degree of overlap is inversely proportional to the intake pressure, thereby controlling the intake volume into the annular expansion chamber, which is beneficial to further improve the gas emission efficiency and pressure reduction effect.

[0019] 4. When the pressure reducing valve of the present invention adopts the pressure reducing sleeve assembly, the rotation of the inner sleeve can simultaneously achieve dual adjustment of the expansion chamber volume and the intake air flow, thereby adapting to abnormal fluctuations in intake air pressure and improving the pressure reducing effect and emission efficiency of the pressure reducing valve outlet. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the pressure-reducing sleeve assembly of the present invention; Figure 2 This is a schematic diagram of the annular expansion chamber under low intake pressure according to the present invention; Figure 3 This is a schematic diagram of the annular expansion chamber under high intake pressure according to the present invention; Figure 4 This is a schematic diagram of the retaining ring of the present invention; Figure 5 This is a schematic diagram of the adjusting ring of the present invention; Figure 6 This is a schematic diagram of the inner sleeve of the present invention; Figure 7 This is a schematic diagram of the pressure reducing valve of the present invention.

[0021] In the diagram: 1. Inner sleeve; 2. Outer sleeve; 3. Air inlet; 4. Annular mounting cavity; 5. Spacer ring; 6. Annular partition cavity; 7. Adjusting ring; 8. Annular expansion cavity; 9. Vent hole; 10. Exhaust hole; 11. Retaining ring; 12. Adjusting hole; 13. Slide rod; 14. Spiral groove; 15. Sealing ring; 16. Valve body; 17. Air inlet; 18. Air outlet; 19. Valve core assembly; 20. Servo motor. Detailed Implementation

[0022] 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.

[0023] The inventors of this invention have discovered that the expansion chamber volume of existing pressure reducing sleeve assemblies is designed to match the rated inlet pressure, while the valve core assembly in the pressure reducing valve can only regulate the gas flow rate entering the pressure reducing sleeve assembly.

[0024] When the intake pressure is too low, increasing the valve opening will only increase the total amount of gas entering the expansion chamber. Since the low-pressure gas itself has low kinetic energy, it will still undergo excessive diffusion after entering the large-volume chamber, resulting in a slow outlet flow rate. If the valve opening is reduced, the intake volume will be further reduced, making the gas in the chamber even thinner, which will further aggravate the gas diffusion phenomenon.

[0025] When the intake pressure is too high, reducing the valve opening will only reduce the total amount of gas entering the expansion chamber. The pressure reduction effect provided by the fixed volume expansion chamber is limited, and insufficient pressure reduction is likely to occur. If the valve opening is increased, a large amount of high-pressure gas will rush into the expansion chamber, which will worsen the pressure reduction effect.

[0026] Based on the above findings, this invention proposes a new technical approach that enables the volume of the expansion chamber to be adjustable, thereby adapting to different intake pressures and balancing decompression effect and emission efficiency.

[0027] Example 1: Please refer to Figures 1 to 6 A pressure-reducing sleeve assembly includes an inner sleeve 1 and an outer sleeve 2 coaxially sleeved together. The top of the inner sleeve 1 is provided with an air inlet 3, and its bottom is sealed, allowing gas to enter the interior of the inner sleeve 1 through the air inlet 3. An annular mounting cavity 4 is formed between the inner sleeve 1 and the outer sleeve 2. Both the upper and lower ends of the annular mounting cavity 4 are sealed to provide installation space for other structures.

[0028] To address the problems of existing technologies, at least two spacer rings 5 ​​are spaced apart along their axial direction within the annular mounting cavity 4, forming an annular partition 6 between adjacent spacer rings 5. Multiple annular partition cavities 6 can be arranged along the axial direction of the annular mounting cavity 4, which helps to increase the gas processing throughput and ensure the overall depressurization processing capacity.

[0029] Two adjusting rings 7 are spaced apart along their axial direction within the annular cavity 6. The outer peripheral wall of each adjusting ring 7 slides against the inner peripheral wall of the outer sleeve 2, and the inner peripheral wall of each adjusting ring 7 slides against the outer peripheral wall of the inner sleeve 1, thus forming an annular expansion cavity 8 between the two adjusting rings 7. After the gas enters the annular expansion cavity 8, it suddenly expands, thereby reducing the pressure. A vent hole 9 communicating with the annular expansion cavity 8 is penetrating through the side wall of the inner sleeve 1, and an exhaust hole 10 communicating with the annular expansion cavity 8 is penetrating through the side wall of the outer sleeve 2. In use, the gas enters the interior of the inner sleeve 1 through the inlet 3, then enters the annular expansion cavity 8 through the vent hole 9 for expansion and pressure reduction; finally, it is discharged through the exhaust hole 10.

[0030] Most importantly, the two adjusting rings 7 can move away from or closer to each other along the axis of the annular expansion chamber 8 to adjust the size of the annular expansion chamber 8, so that the size of the annular expansion chamber 8 is directly proportional to the intake pressure of the pressure reducing sleeve assembly, which is beneficial to simultaneously take into account the gas emission efficiency and pressure reduction effect.

[0031] Specifically, when the intake pressure is too low, the two regulating rings 7 move closer together, causing the volume of the annular expansion chamber 8 to decrease synchronously. Since the kinetic energy and pressure potential energy of the low-pressure gas are relatively weak, the reduced annular expansion chamber 8 can reduce the possibility of excessive diffusion of the low-pressure gas in the large space cavity, which is conducive to maintaining the normal gas flow rate and, to a certain extent, avoids the outlet flow rate being too slow.

[0032] When the intake pressure is too high, the two regulating rings 7 move further apart, causing the volume of the annular expansion chamber 8 to increase. The expanded annular expansion chamber 8 provides a relatively sufficient expansion buffer space for the high-pressure gas; after the high-pressure gas enters the large-volume chamber, it can effectively expand, thus helping to ensure the pressure reduction effect.

[0033] The above design ensures that the size of the annular expansion chamber 8 is directly proportional to the inlet pressure of the pressure-reducing sleeve assembly. In other words, the lower the inlet pressure, the smaller the volume of the annular expansion chamber 8. By reducing the chamber space, excessive gas diffusion due to insufficient kinetic energy is avoided, which helps maintain the normal gas flow rate. Conversely, the higher the inlet pressure, the larger the volume of the annular expansion chamber 8, providing ample expansion space for the high-pressure gas and ensuring effective pressure reduction. Compared to traditional pressure-reducing sleeve assemblies, this design can, to some extent, reduce the problems of decreased delivery efficiency or pressure reduction failure caused by abnormal pressure fluctuations.

[0034] The following explains how the two adjusting rings 7 move closer to or further apart from each other: The inner sleeve 1 and the outer sleeve 2 are rotatably connected by bearings, and a seal is provided at the rotatable connection to reduce gas leakage from the connection gap. The inner sleeve 1 can rotate around its own axis, and a linkage-type spacing adjustment structure is provided between the inner sleeve 1 and the two adjusting rings 7. When the inner sleeve 1 rotates clockwise or counterclockwise around its own axis, the linkage-type spacing adjustment structure drives the two adjusting rings 7 to move away from or closer to each other.

[0035] In this embodiment, a servo motor 20 is mounted on the bottom of the outer sleeve 2 via a bracket. The output end of the servo motor 20 is connected to the inner sleeve 1 for driving the inner sleeve 1 to rotate around its own axis. A pressure sensor is installed at the air inlet 3. This pressure sensor can collect the air inlet pressure signal in real time and transmit the signal to the controller, forming a control system of "pressure detection, signal processing, and drive adjustment". It should be noted that, depending on the usage environment, the servo motor 20 and the pressure sensor can be selected as high-temperature resistant and explosion-proof models to adapt to application scenarios with high high-temperature or explosion-proof requirements.

[0036] Specifically, the controller has several preset pressure threshold ranges corresponding to the intake pressure (the thresholds can be calibrated according to actual needs). Based on the pressure sensor's detection results, the servo motor automatically drives the inner sleeve 1 to rotate by the corresponding angle, thereby precisely adjusting the volume of the annular expansion chamber 8 to achieve adaptive matching between pressure and volume. For example: In the low-pressure fluctuation range (0.5-1.0MPa), when the pressure sensor detects that the intake pressure is in this range, the controller instructs the servo motor to drive the inner sleeve 1 to rotate by the corresponding angle. Through the linkage spacing adjustment structure, the two adjustment rings 7 are brought closer to each other to the maximum stroke, and the annular expansion chamber 8 is contracted to the minimum volume to avoid excessive diffusion of low-pressure gas. In the normal high pressure range (2.5-4.0MPa), when the intake pressure is in this range, the servo motor drives the inner sleeve 1 to rotate by the corresponding angle, and the two adjusting rings 7 move away from each other appropriately, so that the volume of the annular expansion chamber 8 is expanded to a larger volume, providing sufficient expansion space for the gas and ensuring the pressure reduction effect. Using the above design, the volume control of the annular expansion chamber 8 can be achieved through a single action: rotating the inner sleeve 1 using a servo motor. The overall structure is simple and compact. Furthermore, in the actual structural layout, multiple moving sleeves and multiple stationary sleeves can be added according to the requirements of high pressure differential and high flow rate conditions. The moving sleeves and stationary sleeves are alternately and coaxially fitted to form a multi-stage pressure reduction structure. Through the gradual expansion and step-by-step pressure relief of the multi-stage expansion chambers, the overall pressure reduction amplitude and pressure stabilization accuracy can be improved.

[0037] The following is an introduction to the linkage-type spacing adjustment structure: The linkage-type spacing adjustment structure includes a slide rod 13 fixed to the inner peripheral wall of each adjustment ring 7. The outer peripheral wall of the inner sleeve 1 is provided with a spiral groove 14 corresponding to each slide rod 13. The end of each slide rod 13 away from the adjustment ring 7 is slidably embedded in the corresponding spiral groove 14. The spiral grooves 14 corresponding to the two adjustment rings 7 rotate in opposite directions, so that when the inner sleeve 1 rotates, it can drive the two adjustment rings 7 to move away from or towards each other.

[0038] When the inner sleeve 1 is rotated, the rotational motion of the inner sleeve 1 can be converted into the axial motion of the adjusting ring 7 by relying on the sliding engagement between the spiral groove 14 and the slide rod 13, thereby driving the two adjusting rings 7 to move closer or further apart. If a multi-stage pressure reduction method is adopted by alternately nesting multiple moving sleeves and multiple stationary sleeves, spiral grooves 14 can be evenly distributed on the outer and inner circumferential walls of the moving sleeve, and slide rods 13 can be fixed on the outer or inner circumferential walls of the corresponding adjusting rings 7, so as to achieve synchronous linkage adjustment of multiple sets of adjusting rings 7.

[0039] With the above design, the volume of the annular expansion chamber 8 can be steplessly adjusted when the inner sleeve 1 is rotated, allowing the volume of the annular expansion chamber 8 to have a linear relationship with the intake pressure, minimizing the presence of pressure adaptation blind spots. Furthermore, the overall structure is simple, with all components arranged in the assembly gap between the inner sleeve 1 and the adjusting ring 7. No components obstruct the interior of the annular expansion chamber 8, effectively ensuring smooth gas flow.

[0040] Furthermore, at least three slide rods 13 are provided on the inner circumferential wall of the adjusting ring 7. The three slide rods 13 are evenly distributed along the inner circumferential wall of the adjusting ring 7. Through three-point support, the adjusting ring 7 can be subjected to uniform force during axial sliding, which can improve the stability of the adjusting ring 7 operation.

[0041] In addition, the slide rod 13 adopts a segmented design, which includes a fixed section and a rotating section. The fixed section is fixedly connected to the inner circumferential wall of the adjusting ring 7, and the rotating section is rotatably connected to the fixed section and slidably embedded in the spiral groove 14. During the rotation of the inner sleeve 1 and the axial movement of the adjusting ring 7, the rotating section can adaptively rotate following the spiral trajectory of the spiral groove 14, converting the pure sliding friction between the slide rod 13 and the spiral groove 14 into rotational friction, which can reduce the wear between the two to a certain extent.

[0042] It should be noted that in this embodiment, the outer peripheral wall of the spacer ring 5 is fixedly connected to the inner peripheral wall of the outer sleeve 2, and the inner peripheral wall of the spacer ring 5 is movably fitted with the outer peripheral wall of the inner sleeve 1. This ensures the installation and positioning of the spacer ring 5 and prevents rotational interference to the inner sleeve 1, thus ensuring that the inner sleeve 1 can rotate normally.

[0043] Furthermore, a sealing ring 15 is fixedly embedded in the inner peripheral wall of the spacer ring 5. The sealing ring 15 abuts against the outer peripheral wall of the inner sleeve 1, which can seal the fitting gap between the spacer ring 5 and the inner sleeve 1, making it difficult for gas to escape from the fitting gap between the two, which is conducive to ensuring the stability of gas pressure in the cavity.

[0044] In another embodiment of this application, a retaining ring 11 is fixed between the opposite ends of the two spacer rings 5. The inner peripheral wall of the retaining ring 11 is in movable contact with the outer peripheral wall of the inner sleeve 1, and the outer peripheral wall of the retaining ring 11 is in movable contact with the inner peripheral wall of each adjusting ring 7. Correspondingly, the inner peripheral wall of the adjusting ring 7 is no longer in direct contact with the outer peripheral wall of the inner sleeve 1. An avoidance hole is provided on the retaining ring 11 for the sliding rod 13 to pass through, so as to avoid structural interference. An adjusting hole 12 corresponding to the vent hole 9 is provided on the side wall of the retaining ring 11. The gas in the inner sleeve 1 enters the annular expansion cavity 8 in sequence through the vent hole 9 and the adjusting hole 12.

[0045] When the inner sleeve 1 rotates clockwise or counterclockwise around its own axis, the alignment and overlap between the vent hole 9 and the adjustment hole 12 can be adjusted. Specifically, by relying on the rotation of the inner sleeve 1, the degree of alignment and overlap can be infinitely adjusted, so that the degree of overlap is inversely proportional to the intake pressure.

[0046] Specifically, when the intake pressure is low, the gas itself has weak kinetic energy and poor flow capacity, resulting in increased overlap, which helps to increase the intake volume and prevents the gas in the cavity from becoming too thin due to insufficient intake volume. When the intake pressure is high, the overlap decreases, which reduces the amount of gas entering the annular expansion chamber 8 per unit time, making it less likely that a large amount of high-pressure gas will rush into the cavity instantly, leading to insufficient decompression.

[0047] By adopting the above design, the rotation of the inner sleeve 1 can simultaneously achieve dual linear linkage adjustment of "intake flow rate (inversely proportional to the degree of overlap)" and "expansion chamber volume (directly proportional)," thereby taking into account both pressure reduction effect and emission efficiency under different pressure conditions. When the intake pressure is below the normal range, the inner sleeve 1 rotates, increasing the overlap between the adjusting hole 12 and the vent hole 9, fully opening the intake channel and ensuring sufficient intake volume. This prevents the low-pressure gas from slowing down due to insufficient flow. Simultaneously, the linkage-type spacing adjustment structure moves the two adjusting rings 7 closer together, causing the volume of the annular expansion chamber 8 to decrease synchronously, preventing excessive diffusion of the low-pressure gas. Therefore, the sufficient intake volume and the small-volume chamber can, to a certain extent, prevent the flow rate from slowing down.

[0048] When the intake pressure exceeds the normal range, the inner sleeve 1 rotates, reducing the overlap between the adjusting hole 12 and the vent hole 9, partially opening the intake channel and reducing the amount of gas entering the cavity, thus ensuring the cavity's pressure reduction effect. Simultaneously, the adjusting rings 7 move further apart, and the volume of the annular expansion chamber 8 increases synchronously, providing ample expansion space for the high-pressure gas and facilitating sufficient gas pressure dissipation. Therefore, the gas, after flow restriction, expands within the large-volume cavity, which can, to some extent, reduce the problem of insufficient pressure reduction leading to excessive outlet pressure.

[0049] Furthermore, both the adjusting hole 12 and the vent hole 9 are arc-shaped through holes, with the arc length of the adjusting hole 12 being greater than that of the vent hole 9. In the initial state, the annular expansion chamber 8 is in its minimum volume state, at which point the vent hole 9 and the adjusting hole 12 completely overlap. As the intake pressure increases, the inner sleeve 1 rotates, driving the volume of the annular expansion chamber 8 to increase synchronously. During this adjustment phase, the vent hole 9 always falls within the arc-shaped coverage area of ​​the adjusting hole 12, maintaining maximum overlap, and the ventilation volume remains constant. When the volume of the annular expansion chamber 8 is adjusted to a level suitable for medium pressure conditions, if the intake pressure continues to increase, the vent hole 9 and the adjusting hole 12 begin to misalign, thereby achieving an inverse proportional adjustment between the degree of overlap and the intake pressure.

[0050] Because low-pressure gas has weak kinetic energy and poor flow capacity, adjusting the volume of the annular expansion chamber 8 while simultaneously changing the ventilation rate can easily lead to a sudden decrease in the intake flow rate. However, the above design, by reserving a constant ventilation rate adjustment section through the arc length difference, can maintain a constant ventilation rate while reducing the volume of the annular expansion chamber 8 and solving the problem of excessive gas diffusion, thus ensuring sufficient intake flow rate under low-pressure conditions.

[0051] Example 2: Please refer to Figure 7 This embodiment also proposes a pressure reducing valve, including the pressure reducing sleeve assembly described above, and a valve body 16. The valve body 16 is provided with an air inlet 17, an air outlet 18 and a valve core assembly 19. The valve core assembly 19 is located between the air inlet 17 and the pressure reducing sleeve assembly. The exhaust port 10 is connected to the air outlet 18.

[0052] In this embodiment, the outer sleeve 2 is detachably fixed to the valve body 16 by screws, facilitating the replacement or maintenance of the entire pressure reducing sleeve assembly. A sealing ring is sandwiched at the junction of the valve body 16 and the outer sleeve 2 to prevent gas leakage. In addition, the valve body 16 has a wire inlet hole through which the wires of the servo motor 20 and the pressure sensor pass, and the wire inlet hole is sealed to reduce the risk of gas leakage.

[0053] In use, external high-pressure gas is first introduced into the valve body 16, and after being adjusted by the valve core assembly 19, it enters the inner sleeve 1. Subsequently, the gas enters the annular expansion chamber 8 through the vent hole 9 and the adjustment hole 12 in sequence, where it expands and depressurizes, and is finally discharged outward through the exhaust hole 10, thus realizing the pressure reduction and transportation of high-pressure gas.

[0054] This pressure reducing valve adopts the above design, which can simultaneously achieve dual linkage adjustment of the volume of the annular expansion chamber 8 and the air intake flow through a single action of rotating the inner sleeve 1. This ensures gas emission efficiency under low pressure conditions and meets the pressure reduction requirements under high pressure conditions, which is conducive to improving the stability of the pressure reducing valve outlet.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure-reducing sleeve assembly, comprising an inner sleeve and an outer sleeve coaxially sleeved together, wherein the top of the inner sleeve is provided with an air inlet, characterized in that: An annular mounting cavity is formed between the inner sleeve and the outer sleeve. At least two spacer rings are distributed at intervals along their own axial direction in the annular mounting cavity, and an annular partition cavity is formed between two adjacent spacer rings. Two adjusting rings are spaced apart along their own axial direction inside the annular cavity, forming an annular expansion cavity between the two adjusting rings; a vent hole communicating with the annular expansion cavity is penetrating through the side wall of the inner sleeve, and an exhaust hole communicating with the annular expansion cavity is penetrating through the side wall of the outer sleeve. The inner sleeve is rotatably connected to the outer sleeve, the inner sleeve can rotate around its own axis, and a linkage-type spacing adjustment structure is provided between the inner sleeve and the two adjusting rings; When the inner sleeve rotates clockwise or counterclockwise around its own axis, the two adjusting rings are driven to move away from or closer to each other through the linkage spacing adjustment structure, so as to adjust the size of the annular expansion cavity.

2. The pressure-reducing sleeve assembly according to claim 1, characterized in that: A retaining ring is fixed between the opposite ends of the two spacer rings. The inner peripheral wall of the retaining ring is in movable contact with the outer peripheral wall of the inner sleeve, and the outer peripheral wall of the retaining ring is in movable contact with the inner peripheral wall of each adjusting ring. An adjusting hole corresponding to the vent hole is opened on the side wall of the retaining ring. When the inner sleeve rotates clockwise or counterclockwise around its own axis, the alignment and overlap of the vent hole and the adjustment hole can be adjusted.

3. The pressure-reducing sleeve assembly according to claim 2, characterized in that: Both the adjustment hole and the vent hole are arc-shaped through holes, and the arc length of the adjustment hole is greater than that of the vent hole.

4. The pressure-reducing sleeve assembly according to claim 1, characterized in that: The linkage spacing adjustment structure includes a slide rod fixed to the inner peripheral wall of each adjustment ring. The outer peripheral wall of the inner sleeve is provided with a spiral groove corresponding to each slide rod. The end of each slide rod away from the adjustment ring is slidably embedded in the corresponding spiral groove. The spiral grooves corresponding to the two adjustment rings rotate in opposite directions.

5. The pressure-reducing sleeve assembly according to claim 4, characterized in that: At least three slide rods are provided on the inner peripheral wall of the adjusting ring, and the three slide rods are distributed at equal intervals along the inner peripheral wall of the adjusting ring.

6. The pressure-reducing sleeve assembly according to claim 4, characterized in that: The slide bar includes a fixed section and a rotating section; the fixed section is fixedly connected to the inner circumferential wall of the adjusting ring, and the rotating section is rotatably connected to the fixed section and slidably embedded in the spiral groove.

7. The pressure-reducing sleeve assembly according to claim 1, characterized in that: The outer peripheral wall of the spacer ring is fixedly connected to the inner peripheral wall of the outer sleeve, and the inner peripheral wall of the spacer ring is movably fitted to the outer peripheral wall of the inner sleeve.

8. The pressure-reducing sleeve assembly according to claim 7, characterized in that: A sealing ring is fixedly embedded in the inner peripheral wall of the spacer ring, and the sealing ring abuts against the outer peripheral wall of the inner sleeve.

9. A pressure reducing valve, comprising the pressure reducing sleeve assembly as described in any one of claims 1-8, characterized in that: It also includes a valve body, which has an air inlet, an air outlet and a valve core assembly; the valve core assembly is located between the air inlet and the pressure reducing sleeve assembly.

10. The pressure reducing valve according to claim 9, characterized in that: The outer sleeve is detachably fixed to the valve body, and a sealing ring is provided at the junction of the valve body and the outer sleeve.

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