Sealed pressure reducing device of manual extremely-high-pressure supercharging equipment and using method of sealed pressure reducing device

Abstract

The invention belongs to the field of high-pressure equipment, and relates to a sealing pressure reducing device of manual extremely-high-pressure supercharging equipment and a using method of the sealing pressure reducing device. The sealing pressure reduction device comprises a sealing rod and a fixing sleeve, a supporting rod with the diameter smaller than that of the sealing rod is integrally formed in the center of the right end of the sealing rod, the supporting rod is sleeved with the fixing sleeve in an interference fit mode, the left end of the fixing sleeve is sleeved with the sealing ring in an interference fit mode, and the supporting rod is sleeved with the L-shaped annular pressure reduction mechanisms in an interference fit mode. The L-shaped annular pressure reducing mechanism is located on the left side of the fixing sleeve, and the left end of the L-shaped annular pressure reducing mechanism is sleeved with the sealing ring in an interference fit mode. According to the using method of the sealing pressure-reducing device, the screw rod is manually operated to rotate so that the sealing rod can move towards the outlet direction of the pressure cylinder, abrasion of the inner wall of the pressure cylinder to the sealing pressure-reducing device is reduced through deformation of the L-shaped annular pressure-reducing mechanism, and the pressure-increasing space of the pressure cylinder reaches preset pressure. The pressure reduction function is automatically started by means of pressure applied by fluid, and mechanical abrasion and maintenance requirements are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-pressure equipment, and in particular relates to a sealing pressure reducing device for manual extremely high-pressure boosting equipment and a use method thereof. Background Art

[0002] In the cutting-edge field of industry, ultra-high pressure (above 100MPa) liquid boosting devices are of vital importance. Their sealing structure is related to the stable operation and safety of the boosting device. The current sealing structure presents a diversified trend, but also exposes difficult defects.

[0003] From the current situation, in terms of materials for sealing structures, rubber seals are used at 100-200MPa. For example, nitrile rubber and fluororubber are characterized by good elasticity and oil resistance, and are sealed by pre-compression gap filling; polytetrafluoroethylene (PTFE) and modified products are suitable for high-pressure working conditions due to low friction and chemical stability. They rely on the addition of glass fiber to strengthen pressure resistance, and the upper limit of pressure can reach 300MPa. In terms of the form of sealing structure, axial seals are more common in plunger pumps, with multiple groups of V-shaped rubber rings combined to lock liquid by axial pressure; radial seals are used in pipelines and rotating shafts, with metal sealing rings fitting the pipeline, and rotating shaft seals integrating mechanical and fluid dynamic forms, each showing its strengths.

[0004] Most of the existing technical solutions are based on the design of multi-stage one-way valves. The sealing structure is embedded in the key nodes of the booster cylinder as the key to control the flow direction of the liquid and maintain high pressure stability. Generally, a conical sealing form is adopted. The sealing relies on the precise taper between the valve core and the valve seat. In the initial low-pressure state, the valve core and the valve seat are slightly fitted, leaving a slight gap to facilitate the smooth passage of low-pressure liquid. When the equipment is working, the piston reciprocates, and each movement will drive part of the low-pressure liquid into the one-way valve. As the liquid in the valve increases, the pressure in the valve increases, and the fluid force causes the valve core to move radially along the conical surface. The valve core and the valve seat fit more and more closely to form a reliable seal. The valve core is made of cemented carbide, which is densely formed by high-performance powders such as tungsten carbide and cobalt through powder metallurgy high-temperature sintering process. The hardness is as high as HRA88-92, which is much higher than that of common metal materials. It can withstand the strong erosion of high-pressure liquid at a flow rate of several meters per second, ensuring the stability of the valve structure.

[0005] In the existing technical solutions, one is that the valve stem drives the valve core to rotate, such as the movement of ball valves and butterfly valves, which are both rotary motions; the other is that the valve core moves up and down linearly under the drive of the valve stem, and the movement of the conical regulating valve is linear motion. For ball valves and butterfly valves, this type of valve can only roughly adjust the size of the fluid flow, and cannot accurately control the flow. At the same time, it needs to be coordinated with high-precision motor control, and manual precise pressure control cannot be achieved.

[0006] The defects existing in the existing technology should not be underestimated. At the material level, the molecular chain of rubber seals is damaged under ultra-high pressure, and permanent deformation leads to loss of elasticity and sealing failure. High temperature environment also aggravates the aging of rubber seals. Although PTFE (polytetrafluoroethylene) is chemically stable, it has poor elasticity. The interface of the modified version is easily peeled off due to long-term pressure and erosion. In terms of sealing, the axial seal is subjected to the reciprocating impact of the plunger, the pressure is uneven, the friction is large under high pressure, and the wear is severe. The processing accuracy of the metal radial sealing ring is almost harsh. The seal will be "lost" if there is a slight deviation. The rotating shaft is disturbed by centrifugal force and vibration, and the sealing surface is difficult to stabilize. In addition, due to the complexity of the medium, corrosive liquids and particle-containing suspensions will corrode and erode the sealing structure; installation and maintenance are even more difficult. Installation requires professional skills. Minor errors will affect the seal. It is difficult to monitor during operation. Wear and leakage are difficult to detect and deal with in time. This greatly restricts the efficiency and life of the ultra-high pressure liquid booster device, and innovation is urgently needed. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a sealing pressure reducing device for manual ultra-high pressure boosting equipment and a method for using the same. The technical solution adopted by the present invention is as follows:

[0008] A sealing and pressure reducing device for a manual extremely high pressure boosting equipment, the sealing and pressure reducing device comprising a sealing rod and a fixing sleeve, a support bar with a smaller diameter than the sealing rod being integrally formed at the center position of the right end of the sealing rod, the right end of the fixing sleeve being closed, the outer periphery of the fixing sleeve being an L-shaped step, the right end diameter of the fixing sleeve being larger than the left end diameter, the fixing sleeve being sleeved on the outer periphery of the support bar with an interference fit connection structure, a sealing ring 2 being sleeved on the left end portion of the fixing sleeve with an interference fit connection structure, a plurality of L-shaped annular pressure reducing mechanisms being sleeved on the outer periphery of the support bar with an interference fit connection structure, the L-shaped annular pressure reducing mechanism being located on the left side of the fixing sleeve and adjacent ends being fitted to each other, the left end diameter of the L-shaped annular pressure reducing mechanism being smaller than the right end diameter, and a sealing ring 1 being sleeved on the left end portion of the L-shaped annular pressure reducing mechanism with an interference fit connection structure.

[0009] Preferably, the manual extremely high pressure boosting equipment comprises a boosting cylinder arranged outside, and a sealed pressure reducing device is arranged inside the boosting cylinder.

[0010] Preferably, a hole is opened at the center of the left end of the sealing rod to connect with the screw transmission mechanism.

[0011] Preferably, the L-shaped annular pressure reducing mechanism is made of titanium alloy, and the sealing ring 1 and the sealing ring 2 are made of rubber sealing rings.

[0012] The method for using the sealed pressure reducing device of the aforementioned manual extremely high pressure boosting equipment comprises the following steps:

[0013] Fill the boosting space of the boosting cylinder with the oil to be boosted;

[0014] Manually operate the screw to rotate;

[0015] The screw transmission mechanism eliminates the screw rotation variable, and the screw transmission mechanism causes the sealing rod to move toward the outlet of the booster cylinder;

[0016] The L-shaped annular pressure reducing mechanism is deformed, and the wear of the inner wall of the boost cylinder on the sealing pressure reducing device can be reduced by reducing the pressure through deformation;

[0017] The boosting space of the boosting cylinder reaches the preset pressure and the boosting is completed.

[0018] Preferably, when the short side force-bearing protrusion of the L-shaped annular pressure reducing mechanism is subjected to sufficient pressure, the resilience of the metal is utilized to produce a slight deformation to cause the L-shaped annular pressure reducing mechanism to expand toward the tube wall of the boost cylinder, and the left end of the long side portion of the L-shaped annular pressure reducing mechanism is tied to the support bar by a sealing ring, so that the expansion deformation of the left end of the L-shaped annular pressure reducing mechanism is smaller than that of the right end, and the L-shaped annular pressure reducing mechanism is slightly deformed into a funnel shape.

[0019] Preferably, the deformation amount of the L-shaped annular pressure reducing mechanism is:

[0020]

[0021] Where, Δl: deformation, l: original length, E: elastic modulus, δ: short side stress;

[0022] Short side stress:

[0023]

[0024] Wherein, δ: short side stress, F: resultant force acting on the short side section of the L-shaped annular pressure reducing mechanism, A: cross-sectional area.

[0025] Beneficial effects of the present invention:

[0026] The present invention can significantly adjust the fluid pressure at the sealing structure while maintaining fluid circulation, automatically start the pressure reduction function with the help of the pressure applied by the fluid, and has fewer moving parts, which reduces the mechanical wear and maintenance requirements at the sealing structure, and improves the reliability and durability of the sealing structure. During the use of the device, multiple L-shaped annular pressure reduction mechanisms can be connected to significantly improve the overall pressure reduction function at the sealing structure of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 is a cross-sectional view of a sealed pressure reducing device according to Embodiment 1 of the present invention;

[0029] Figure 2 is a cross-sectional view of a sealing rod according to a first embodiment of the present invention;

[0030] Figure 3 is a working flow chart of the sealed pressure reducing device of the second embodiment of the present invention;

[0031] Figure 4 is a partial deformation principle diagram of the L-shaped annular pressure reducing mechanism of the second embodiment of the present invention;

[0032] Among them, 1 is a sealing rod, 2 is an L-shaped annular pressure reducing mechanism, 3 is a fixing sleeve, 4 is a sealing ring 1, 5 is a sealing ring 2, 6 is a boosting cylinder, 7 is a screw transmission mechanism, 8 is a boosting space, and 9 is a support bar. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0034] Embodiment 1

[0035] In view of the technical problem that there is no extremely stable high-pressure sealing component (above 150MPA) in a manual continuous pressure environment, the first embodiment of the present invention proposes a new sealing component based on an L-shaped annular pressure reduction mechanism 2. The sealing component can reduce mechanical wear by reducing pressure. The specific implementation method and technical solution are as follows:

[0036] like Figure 1 , 2 As shown, a sealed pressure reducing device of a manual extremely high pressure boosting device comprises a boosting cylinder 6 arranged outside, a sealed pressure reducing device is arranged inside the boosting cylinder 6, and the sealed pressure reducing device comprises: a sealing ring 1 4, a sealing ring 2 5, an L-shaped annular pressure reducing mechanism 2, a sealing rod 1 and a fixing sleeve 3. A hole is opened at the center of the left end of the sealing rod 1 to connect the screw transmission mechanism 7 to form a hinge joint connection, and the sealing rod 1 is driven to move to the right end by the screw transmission mechanism 7; a support bar 9 with a diameter smaller than the sealing rod 1 is integrally formed at the center of the right end of the sealing rod 1.

[0037] Among them, the right end of the fixed sleeve 3 is closed, the outer periphery of the fixed sleeve 3 is an L-shaped step, the diameter of the right end of the fixed sleeve 3 is larger than the diameter of the left end, the fixed sleeve 3 is sleeved on the outer periphery of the support bar 9 at the right end of the sealing rod 1 with an interference fit connection structure, and the sealing ring 2 5 is sleeved on the left end of the fixed sleeve 3 with an interference fit connection structure. The diameter of the left end of the L-shaped annular pressure reducing mechanism 2 is smaller than the diameter of the right end, the L-shaped annular pressure reducing mechanism 2 is sleeved on the outer periphery of the support bar 9 at the right end of the sealing rod 1 with an interference fit connection structure, the L-shaped annular pressure reducing mechanism 2 is located on the left side of the fixed sleeve 3, and the sealing ring 1 4 is sleeved on the left end of the L-shaped annular pressure reducing mechanism 2 with an interference fit connection structure. During assembly, the L-shaped annular pressure reducing mechanism 2 and the sealing ring 1 4 are installed first, and the fixed sleeve 3 and the sealing ring 2 5 are installed last.

[0038] To ensure Figure 1 The composition is clear, and a large gap is drawn between the sealed pressure reducing device and the inner wall of the boosting cylinder 6. In the actual product, the sealed pressure reducing device and the inner wall of the boosting cylinder 6 are basically in close contact, and there is only a very small gap between the sealed pressure reducing device and the inner wall of the boosting cylinder 6. The right end surface of the fixed sleeve 3 and the inner wall of the boosting cylinder 6 and the right end of the boosting cylinder 6 form a boosting space 8, which is filled with oil to be boosted, and the right end of the boosting cylinder 6 is connected to the application equipment.

[0039] in addition, Figure 1 Only one L-shaped annular pressure reducing mechanism 2 is shown, but in actual application, several L-shaped annular pressure reducing mechanisms 2 can be provided as required. The L-shaped annular pressure reducing mechanism 2 is made of titanium alloy, and the sealing ring 1 4 and the sealing ring 2 5 are made of rubber sealing rings.

[0040] The sealed pressure reducing device of a manual extremely high pressure boosting device provided in the first embodiment of the present invention has the following advantages:

[0041] 1. By installing multiple L-shaped annular pressure reducing mechanisms 2 on the sealing rod 1, the sealing ability of the sealing structure is enhanced, so that the pressure-increasing requirements of higher pressures can be met. 2. The structure is simple and the maintenance cost is low. 3. It is suitable for manual and electric pressure-increasing devices. 4. It does not rely on the step-by-step pressure increase of the one-way valve, and can achieve pressure increase of any pressure, meeting more precise pressure-increasing requirements.

[0042] Embodiment 2

[0043] like Figure 3 , 4 As shown, the method for using the sealing pressure reducing device of the manual ultra-high pressure boosting equipment described in the first embodiment is to manually operate the screw rod, and the screw rod drives the screw rod transmission mechanism 7, and the oil pressure is increased by moving the screw rod transmission mechanism 7 and the sealing rod 1 to the right. The following steps are included:

[0044] Fill the boosting space 8 of the boosting cylinder 6 with the oil to be boosted;

[0045] Manually operate the screw to rotate;

[0046] The screw transmission mechanism 7 eliminates the screw rotation variable, and the screw transmission mechanism 7 enables the sealing rod 1 to move toward the outlet of the booster cylinder 6 (i.e., the booster space 8);

[0047] The L-shaped annular pressure reducing mechanism 2 is deformed, and the wear of the inner wall of the boost cylinder 6 on the sealing pressure reducing device can be reduced by reducing the pressure due to deformation;

[0048] The boosting space 8 of the boosting cylinder 6 reaches a predetermined pressure, and the boosting is completed.

[0049] When the sealing rod 1 is affected by external force and moves toward the boosting space 8 at the outlet of the boosting cylinder 6, the oil is continuously squeezed and pressurized by the sealing rod 1 in the boosting space 8, and the oil flows in the opposite direction of the boosting along the small gap between the outer wall of the fixed sleeve 3 and the inner wall of the boosting cylinder 6 into the space between the L-shaped annular pressure reducing mechanism 2 and the inner wall of the boosting cylinder 6. The L-shaped annular pressure reducing mechanism 2 is made of a metal with a relatively small elastic modulus such as titanium alloy to ensure that the L-shaped annular pressure reducing mechanism 2 has a good deformation amount. The calculation method of the deformation amount is shown in formulas (1) and (2).

[0050] Deformation of the L-shaped annular pressure reducing mechanism 2:

[0051]

[0052] Wherein, Δl: deformation, l: original length, E: elastic modulus, δ: short side stress.

[0053] Short side stress:

[0054]

[0055] Wherein, δ: short side stress, F: resultant force acting on the short side cross section of the L-shaped annular pressure reducing mechanism 2, A: cross-sectional area.

[0056] When the short side force-bearing protrusion of the L-shaped annular pressure reducing mechanism 2 is subjected to sufficient pressure, the resilience of the metal is utilized to produce a slight deformation to cause the L-shaped annular pressure reducing mechanism 2 to expand toward the tube wall of the boosting cylinder 6 . At the same time, the left end of the long side of the L-shaped annular pressure reducing mechanism 2 is bound by a sealing ring 4 to the support bar 9 at the right end of the sealing rod 1, so that the expansion deformation of the left end of the L-shaped annular pressure reducing mechanism 2 is relatively slight compared with the left end. The L-shaped annular pressure reducing mechanism 2 can be slightly deformed into a funnel shape, so that there is an empty space between the sealed pressure reducing device and the inner wall of the boosting cylinder 6. The oil flows into the empty space under the action of pressure, so that the overall contact area between the sealed pressure reducing device and the oil is increased, and the interval between the L-shaped annular pressure reducing mechanism 2 and the inner wall of the boosting cylinder 6 is reduced. However, due to the elasticity of the metal, there is still space for the oil to flow, thereby reducing the flow velocity of the oil to the left while increasing the resistance, causing a certain degree of energy loss to the oil, and achieving initial pressure reduction of the oil. The calculation formula for the overall pressurization effect of the equipment is shown in formula (3). Since the cross-section of the gap between the L-shaped annular pressure reducing mechanism 2 and the inner wall of the boost cylinder 6 is very small, the flow velocity of the oil increases after flowing through the gap, which reduces the pressure at the gap and increases the expansion speed of the short side force-bearing protrusion of the L-shaped annular pressure reducing mechanism 2 toward the tube wall of the boost cylinder 6.

[0057]

[0058] Where P i : Inlet pressure, P o : outlet pressure, V i : Flow velocity at the inlet, V o : Flow velocity at the outlet, ρ: liquid density.

[0059] At the same time, during the outward expansion of the L-shaped annular pressure reducing mechanism 2, the sealing ring 4 will be stretched as a whole due to the outward force from the sealing pressure reducing device, resulting in a reduction in the space between the sealing ring 4 and the tube wall of the boost cylinder 6, further reducing the leftward pressure of the oil. When the external environment stops pressurizing the inside, the high toughness of the sealing ring 4 can assist the L-shaped annular pressure reducing mechanism 2 to recover quickly, thereby increasing the service life of the manual ultra-high pressure boosting equipment.

[0060] The number of parts used in the present invention to achieve the pressure reduction capability is greatly reduced compared with traditional pressure reduction devices, and the activation of the pressure reduction capability of the equipment is a self-starting pressure reduction affected by the liquid. The wear of the pressure reduction parts only occurs during the pressure reduction process, and unnecessary wear will not be generated due to the need to manually start the equipment.

[0061] In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0062] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. A sealing pressure reducing device for manual ultra-high pressure boosting equipment, the sealing pressure reducing device comprising a sealing rod and a fixing sleeve, a supporting rod having a smaller diameter than the sealing rod being integrally formed at the center of the right end of the sealing rod, characterized in that: The right end of the fixed sleeve is closed, the outer circumference of the fixed sleeve is an L-shaped step, the diameter of the right end of the fixed sleeve is larger than the diameter of the left end, the fixed sleeve is sleeved on the outer circumference of the support bar with an interference fit connection structure, the second sealing ring is sleeved on the left end of the fixed sleeve with an interference fit connection structure, and a plurality of L-shaped annular pressure reducing mechanisms are sleeved on the outer circumference of the support bar with an interference fit connection structure. The L-shaped annular pressure reducing mechanism is located on the left side of the fixed sleeve and adjacent ends are fitted to each other. The diameter of the left end of the L-shaped annular pressure reducing mechanism is smaller than the diameter of the right end, and the first sealing ring is sleeved on the left end of the L-shaped annular pressure reducing mechanism with an interference fit connection structure.

2. A sealed pressure reducing device for manual extremely high pressure boosting equipment according to claim 1, characterized in that: The manual extremely high pressure boosting device comprises a boosting cylinder arranged outside, and a sealed pressure reducing device is arranged inside the boosting cylinder.

3. A sealed pressure reducing device for manual extremely high pressure boosting equipment according to claim 2, characterized in that: The center position of the left end of the sealing rod is opened with a hole connected to the screw transmission mechanism.

4. A sealed pressure reducing device for manual extremely high pressure boosting equipment according to claim 3, characterized in that: The L-shaped annular pressure reducing mechanism is made of titanium alloy, and the first sealing ring and the second sealing ring are made of rubber sealing rings.

5. The method for using the sealed pressure reducing device of manual extremely high pressure boosting equipment according to claim 3, characterized in that: The following steps are involved: Fill the boosting space of the boosting cylinder with the oil to be boosted; Manually operate the screw to rotate; The screw transmission mechanism eliminates the screw rotation variable, and the screw transmission mechanism causes the sealing rod to move toward the outlet of the booster cylinder; The L-shaped annular pressure reducing mechanism is deformed, and the wear of the inner wall of the boost cylinder on the sealing pressure reducing device can be reduced by reducing the pressure through deformation; The boosting space of the boosting cylinder reaches the preset pressure and the boosting is completed.

6. The method for using the sealed pressure reducing device of manual ultra-high pressure boosting equipment according to claim 5, characterized in that: When the short side force-bearing protrusion of the L-shaped annular pressure reducing mechanism is subjected to sufficient pressure, the resilience of the metal is used to produce a slight deformation to cause the L-shaped annular pressure reducing mechanism to expand toward the tube wall of the boost cylinder. The left end of the long side of the L-shaped annular pressure reducing mechanism is tied to the support bar by a sealing ring, so that the expansion deformation of the left end of the L-shaped annular pressure reducing mechanism is smaller than that of the right end, and the L-shaped annular pressure reducing mechanism is slightly deformed into a funnel shape.

7. The method for using the sealed pressure reducing device of manual ultra-high pressure boosting equipment according to claim 6, characterized in that: Deformation of L-shaped annular pressure reducing mechanism: Where, Δl: deformation, l: original length, E: elastic modulus, δ: short side stress; Short side stress: Wherein, δ: short side stress, F: resultant force acting on the short side section of the L-shaped annular pressure reducing mechanism, A: cross-sectional area.

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