Ultralow-temperature high-pressure-difference regulating valve

Abstract

The utility model relates to an ultralow-temperature high-pressure-difference regulating valve, which comprises a valve body, a valve core, a valve core and a valve core, a communicating port is formed in the valve seat; the sleeve is provided with a first-stage pressure reduction structure, and the first-stage pressure reduction structure communicates with the medium inlet; the valve seat is provided with a second-stage pressure reduction structure, the second-stage pressure reduction structure communicates with the medium outlet, and the communicating opening is located between the first-stage pressure reduction structure and the second-stage pressure reduction structure. The valve core is used for closing or opening the communication port; the valve rod is connected with the valve core; the upper valve cover is matched with the sleeve in an abutting mode, and a padding component is arranged between the upper valve cover and the valve rod. A medium enters from the medium inlet, passes through the first-stage pressure reduction structure, reaches the second-stage pressure reduction structure through the communication opening, enters the medium outlet and then flows out of the valve body. Fluid is throttled through the first-stage pressure reduction structure and the second-stage pressure reduction structure, and the pressure of the fluid is reduced. According to the invention, the medium pressure can be effectively reduced, so that the problem of sealing line washing failure is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to an ultra-low temperature high pressure differential regulating valve. Background Technology

[0002] Currently, cryogenic high-pressure differential control valves employ a sleeve-type structure, consisting of a valve body, valve seat, sleeve, sealing ring, guide ring, upper valve cover, packing components, valve plug, valve stem, connecting bolts, and gaskets. The valve plug moves up and down via a drive device, changing the window of the sleeve to achieve flow regulation. However, in high-pressure differential conditions, the window-type sleeve cannot reduce pressure, leading to severe erosion of the sealing line (the sealing surface where the valve plug contacts the valve seat). Long-term exposure to high-speed media causes wear phenomena such as grooves, pits, and peeling (similar to a "water jet cutting" effect), resulting in loss of sealing surface precision. When the valve is closed, an effective seal cannot be formed, causing media leakage, and even "internal leakage" (i.e., media continues to flow even when the valve is fully closed). Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an ultra-low temperature high pressure differential regulating valve to solve the problem that the window sleeve of the existing ultra-low temperature high pressure differential regulating valve cannot reduce pressure under high pressure differential conditions, which leads to severe erosion of the sealing line.

[0004] To achieve the above and other related objectives, this utility model provides an ultra-low temperature high pressure differential regulating valve, comprising:

[0005] The valve body is equipped with a medium inlet and a medium outlet;

[0006] A valve seat is disposed in the valve body, and the valve seat is provided with a communication port for connecting the medium inlet and the medium outlet;

[0007] A sleeve is provided on the valve body, and the sleeve is provided with a first-stage pressure reduction structure, which is connected to the medium inlet;

[0008] The valve seat is provided with a two-stage pressure reduction structure, which is connected to the medium outlet, and the connection port is located between the first-stage pressure reduction structure and the second-stage pressure reduction structure.

[0009] Valve core, used to close or open the communication port;

[0010] A valve stem is connected to the valve core. The valve stem is used to connect to a drive mechanism. The drive mechanism is used to drive the valve stem to move the valve core to open or close the communication port.

[0011] The upper valve cover is connected to the valve body, and the upper valve cover abuts against the sleeve. The valve stem passes through the upper valve cover and connects to the drive mechanism. A packing component is provided between the upper valve cover and the valve stem.

[0012] Optionally, the primary pressure reduction structure includes a plurality of first through holes distributed along the circumference of the sleeve.

[0013] Optionally, the valve seat is provided with an extension located inside the medium outlet, the secondary pressure reduction structure is disposed on the extension, and the extension is provided with a plurality of second through holes.

[0014] Optionally, the valve seat is welded to the valve body.

[0015] Optionally, a sealing structure is provided between the valve core and the sleeve.

[0016] Optionally, the sleeve is provided with a bushing, and the two ends of the bushing along the axial direction respectively abut against the sealing structure and the upper valve cover.

[0017] Optionally, a guide sleeve is provided between the upper valve cover and the valve stem, the guide sleeve being used to guide the axial movement of the valve stem along the upper valve cover.

[0018] Optionally, the guide sleeve is provided with an annular locking block, and the upper valve cover is provided with an annular locking groove, wherein the annular locking block and the annular locking groove are engaged.

[0019] Optionally, the valve core is threadedly connected to the valve stem, and the valve core has a balance hole along the axial direction, which communicates with the cavity of the upper valve cover.

[0020] Optionally, the valve body is provided with a limiting step, and the sleeve is provided with a limiting part, the limiting part abutting and cooperating with the limiting step.

[0021] As described above, this utility model has the following beneficial effects: Through the primary pressure-reducing structure on the sleeve and the secondary pressure-reducing structure on the valve seat, the medium enters from the medium inlet, passes through the primary pressure-reducing structure on the sleeve, achieving fluid throttling and reducing the fluid pressure inside the sleeve; the medium then passes through the gap between the sleeve and the valve core and reaches the secondary pressure-reducing structure through the connecting port; the fluid passes through the secondary pressure-reducing structure on the valve seat, achieving throttling again, and the fluid pressure at the medium outlet is reduced again before flowing out of the valve body. This application, through the primary pressure-reducing structure on the sleeve and the secondary pressure-reducing structure on the valve seat, can effectively reduce the medium pressure, thereby reducing the problem of seal line erosion failure. Attached Figure Description

[0022] Figure 1 The diagram shown is a cross-sectional view of the cryogenic high-pressure differential control valve as illustrated in an embodiment of this application.

[0023] Figure 2 Displayed as Figure 1 Enlarged schematic diagram of the structure of section A in the middle.

[0024] Explanation of reference numerals in the attached figures

[0025] Valve body 1, medium inlet 101, medium outlet 102, valve seat 2, connecting port 201, extension 202, second through hole 202a, sleeve 3, first through hole 301, limiting part 302, valve core 4, balance hole 401, valve stem 5, upper valve cover 6, packing component 7, sealing structure 8, guide sleeve 9, annular retaining block 901, bushing 10. Detailed Implementation

[0026] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0027] Please see Figures 1 to 2 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components relevant to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes and to assist those skilled in the art in understanding and reading the content disclosed in the specification. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0028] Before describing the embodiments of this utility model in detail, the application environment of this utility model will be described first. The technology of this utility model is mainly applied in the field of valve technology. This utility model is used to solve the problem that in existing cryogenic high-pressure differential regulating valves, the window sleeve cannot reduce pressure under high-pressure differential conditions, which leads to severe erosion of the sealing line.

[0029] Please combine Figures 1 to 2 As shown, this utility model provides an ultra-low temperature high pressure differential regulating valve.

[0030] In an exemplary embodiment of this application, the cryogenic high pressure differential regulating valve includes: a valve body 1, which has a medium inlet 101 and a medium outlet 102;

[0031] Valve seat 2 is disposed inside valve body 1, and valve seat 2 is provided with a communication port 201 that connects medium inlet 101 and medium outlet 102;

[0032] Sleeve 3 is mounted on valve body 1. Sleeve 3 is equipped with a first-stage pressure reduction structure, which is connected to medium inlet 101.

[0033] Among them, the valve seat 2 is provided with a two-stage pressure reduction structure, which is connected to the medium outlet 102, and the connection port 201 is located between the first-stage pressure reduction structure and the second-stage pressure reduction structure;

[0034] Valve core 4 is used to close or open the communication port 201;

[0035] Valve stem 5 is connected to valve core 4. Valve stem 5 is used to connect to drive mechanism. Drive mechanism is used to drive valve stem 5 to move valve core 4 to open or close communication port 201.

[0036] The upper valve cover 6 is connected to the valve body 1. The upper valve cover 6 abuts against the sleeve 3. The valve stem 5 passes through the upper valve cover 6 and connects to the drive mechanism. A packing component 7 is provided between the upper valve cover 6 and the valve stem 5.

[0037] In this embodiment, the upper valve cover 6 and the valve body 1 are fastened together by bolts and nuts. The sleeve 3 is pressed and fixed onto the valve body 1 by abutting with the upper valve cover 6. By providing a connecting port 201 on the valve seat 2 to connect the medium inlet 101 and the medium outlet 102, and by using the valve core 4 to close or open the connecting port 201, and the mating surface between the valve core 4 and the connecting port 201 is a conical surface fit, precise adjustment of the flow rate at a small valve opening can be achieved. Through the first-stage pressure reduction structure provided on the sleeve 3 and the second-stage pressure reduction structure provided on the valve seat 2, the medium enters from the medium inlet 101, passes through the first-stage pressure reduction structure on the sleeve 3 to achieve fluid throttling, and the fluid pressure entering the sleeve 3 is reduced; the medium passes through the gap between the sleeve 3 and the valve core 4 through the connecting port 201 to reach the second-stage pressure reduction structure, and the fluid pressure entering the medium outlet 102 is reduced again before flowing out of the valve body 1. This application effectively reduces the medium pressure by using a primary pressure-reducing structure on the sleeve 3 and a secondary pressure-reducing structure on the valve seat 2, thereby reducing the problem of seal line erosion failure. A sealing mechanism 7 is provided between the upper valve cover 6 and the valve stem 5 to prevent medium leakage.

[0038] In an exemplary embodiment of this application, the primary pressure reduction structure includes a plurality of first through holes 301 distributed circumferentially along the sleeve 3.

[0039] In this embodiment, the multiple first through holes 301 on the sleeve 3 are equivalent to multiple tiny throttling channels. When the fluid flows through the first through hole 301, the flow area suddenly shrinks and the flow velocity increases. According to Bernoulli's principle, the static pressure energy of the fluid is converted into kinetic energy, thereby reducing the downstream pressure. After the fluid passes through the first through hole 301, turbulence is formed. The turbulent vortex consumes energy, further reducing the pressure.

[0040] In an exemplary embodiment of this application, the valve seat 2 is provided with an extension 202 located in the medium outlet 102, a secondary pressure reduction structure is provided on the extension 202, and a plurality of second through holes 202a are distributed on the extension 202.

[0041] In this embodiment, multiple second through holes 202a are evenly distributed at the circumferential and axial ends of the extension 202, which can disperse the concentrated flow of fluid into multiple fine streams, reduce eddies and deflections in the flow field, and make the fluid flow more evenly at the medium outlet 102, thereby achieving a flow stabilization effect.

[0042] In an exemplary embodiment of this application, the valve seat 2 is welded and fixed to the valve body 1.

[0043] In this embodiment, by welding the valve seat 2 to the valve body 1, there is no removable interface, which can effectively eliminate the connection gap between the valve seat 2 and the valve body 1, thereby avoiding the problem of leakage caused by the shrinkage and deformation of parts under low temperature conditions.

[0044] In an exemplary embodiment of this application, a sealing structure 8 is provided between the valve core 4 and the sleeve 3.

[0045] In this embodiment, the sealing structure 8 is a sealing ring, which is used to seal the mating gap between the valve core 4 and the sleeve 3.

[0046] In an exemplary embodiment of this application, a bushing 10 is provided inside the sleeve 3, and the two ends of the bushing 10 along the axial direction abut against the sealing structure 8 and the upper valve cover 6, respectively.

[0047] In this embodiment, the upper valve cover 6 presses against the bushing 10, and the bushing 10 presses against the sealing component, thereby achieving a compression seal between the valve core 4 and the sleeve 3.

[0048] In an exemplary embodiment of this application, a guide sleeve 9 is provided between the upper valve cover 6 and the valve stem 5. The guide sleeve 9 is used to guide the axial movement of the valve stem 5 along the upper valve cover 6.

[0049] In this embodiment, the guide sleeve 9 is located on the valve stem 5 near the valve core 4 along the axial direction. The guide sleeve 9 guides the axial movement of the lower end of the valve stem 5. The packing component 7 is located on the valve stem 5 away from the valve core 4 along the axial direction. The packing component 7 guides the axial movement of the upper end of the valve stem 5. Together with the guide sleeve 9, it guides the axial movement of the lower end of the valve stem 5. This effectively ensures the coaxiality of the valve stem 5 and avoids large leakage and jamming caused by poor coaxiality of the valve stem 5.

[0050] In an exemplary embodiment of this application, the guide sleeve 9 is provided with an annular locking block 901, and the upper valve cover 6 is provided with an annular locking groove, and the annular locking block 901 engages with the annular locking groove.

[0051] In this embodiment, the guide sleeve 9 is connected by an annular locking block 901 engaging with an annular groove provided on the upper valve cover 6.

[0052] In an exemplary embodiment of this application, the valve core 4 is threadedly connected to the valve stem 5, and the valve core 4 has a balance hole 401 along the axial direction, which communicates with the cavity of the upper valve cover 6.

[0053] In this embodiment, the valve core 4 is provided with a balance hole 401, which allows the medium to reach the upper cavity of the upper valve cover 6 through the balance hole 401. A sealing ring is provided between the bushing 10 and the sleeve 3, so that the medium exists only in the upper cavity and the valve core 4, thereby balancing the pressure above and below and reducing the driving force of the drive mechanism.

[0054] In an exemplary embodiment of this application, the valve body 1 is provided with a limiting step, and the sleeve 3 is provided with a limiting part 302, which abuts against the limiting step.

[0055] In this embodiment, the sleeve 3 abuts against the limiting step on the valve body 1 via the limiting part 302, thereby suspending the sleeve 3 on the valve body 1. In ultra-low temperature environments, the valve body 1 and the sleeve 3 will shrink due to differences in material and temperature gradient. Suspending the sleeve 3 on the valve body 1 allows for slight relative movement between the two in the axial or radial direction, avoiding hard compression or pulling caused by differences in shrinkage, thereby reducing gaps or stress tears at the connection interface and preventing media leakage.

[0056] The working principle is as follows: Through a primary pressure-reducing structure on the sleeve 3 and a secondary pressure-reducing structure on the valve seat 2, the medium enters from the medium inlet 101. After passing through the primary pressure-reducing structure on the sleeve 3, the fluid pressure is reduced, thus lowering the pressure inside the sleeve 3. The medium then passes through the gap between the sleeve 3 and the valve core 4, through the connecting port 201, to reach the secondary pressure-reducing structure. After passing through the secondary pressure-reducing structure on the valve seat 2, the fluid pressure is further reduced, and the fluid flows out of the valve body 1 after passing through the secondary pressure-reducing structure. This application, through the primary pressure-reducing structure on the sleeve 3 and the secondary pressure-reducing structure on the valve seat 2, can effectively reduce the medium pressure, thereby reducing the occurrence of sealing line erosion failure. This application can effectively improve the service life of cryogenic high-pressure differential valves, reduce maintenance cycles, and has high economic value. It can be widely used in LNG, air separation units, and other fields.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An ultra-low temperature high pressure drop regulating valve, characterized in that, include: The valve body is equipped with a medium inlet and a medium outlet; A valve seat is disposed in the valve body, and the valve seat is provided with a communication port for connecting the medium inlet and the medium outlet; A sleeve is provided on the valve body, and the sleeve is provided with a first-stage pressure reduction structure, which is connected to the medium inlet; The valve seat is provided with a two-stage pressure reduction structure, which is connected to the medium outlet, and the connection port is located between the first-stage pressure reduction structure and the second-stage pressure reduction structure. Valve core, used to close or open the communication port; A valve stem is connected to the valve core. The valve stem is used to connect to a drive mechanism. The drive mechanism is used to drive the valve stem to move the valve core to open or close the communication port. The upper valve cover is connected to the valve body, and the upper valve cover abuts against the sleeve. The valve stem passes through the upper valve cover and connects to the drive mechanism. A packing component is provided between the upper valve cover and the valve stem.

2. The ultra-low temperature, high pressure drop regulating valve of claim 1, wherein: The primary pressure reduction structure includes a plurality of first through holes distributed along the circumference of the sleeve.

3. The ultra-low temperature, high pressure drop regulator valve of claim 1, wherein: The valve seat is provided with an extension located inside the medium outlet, the secondary pressure reduction structure is disposed on the extension, and the extension is provided with a plurality of second through holes.

4. The ultra-low temperature, high pressure drop regulator valve of claim 1, wherein: The valve seat is welded and fixed to the valve body.

5. The ultra-low temperature, high pressure drop regulator valve of claim 1, wherein: A sealing structure is provided between the valve core and the sleeve.

6. The ultra-low temperature, high pressure drop regulator valve of claim 5, wherein: The sleeve is provided with a bushing, and the two ends of the bushing along the axial direction respectively abut against the sealing structure and the upper valve cover.

7. The ultra-low temperature, high pressure drop regulator valve of claim 1, wherein: A guide sleeve is provided between the upper valve cover and the valve stem, and the guide sleeve is used to guide the valve stem to move axially along the upper valve cover.

8. The ultra-low temperature, high pressure drop regulator valve of claim 7, wherein: The guide sleeve is provided with an annular locking block, and the upper valve cover is provided with an annular locking groove. The annular locking block and the annular locking groove are engaged and cooperated.

9. The ultra-low temperature, high pressure-drop regulating valve of claim 1, wherein: The valve core is threadedly connected to the valve stem, and the valve core has a balance hole along the axial direction, which communicates with the cavity of the upper valve cover.

10. The ultra-low temperature, high pressure-drop regulating valve of claim 1, wherein: The valve body is provided with a limiting step, and the sleeve is provided with a limiting part, which abuts against the limiting step.

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