A quick-cut-off valve for the outlet of a hydrogen compressor

Abstract

This utility model provides a quick-closing valve for the outlet of a hydrogen compressor, relating to the field of valve technology. It includes a pressure-bearing housing, a valve core, a valve core support, a valve seat, an elastic element, a seal, an actuator, and a bracket. The pressure-bearing housing forms a complete pressure boundary. The valve core support includes an upper valve stem and a lower valve stem. One end of the upper valve stem is connected to one side of the valve core, and the other end passes through the upper pressure cover and extends beyond the pressure boundary to connect with the actuator. The actuator drives the upper valve stem to rotate. The lower valve stem is located on the other side of the valve core and is coaxial with the upper valve stem. One end of the lower valve stem extends into a corresponding hole in the valve core, forming a freely rotatable fit with the valve core, and the other end extends into a corresponding hole in the valve body. The valve seat is installed on the valve body and valve cover, and the valve seat and valve core cooperate to form a sealing pair for sealing. This utility model can significantly improve the operational reliability and sealing performance of the quick-closing valve for the outlet of a hydrogen compressor, reduce maintenance requirements, and can also be used as a conventional on / off valve.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a fast shut-off valve for the outlet of a hydrogen compressor. Background Technology

[0002] Quick-shut-off valves are a core component of production safety systems in petrochemical, natural gas, and other high-risk process industries. Their core function is to automatically and reliably cut off the flow of media within pipelines in a very short time when emergency situations such as fire, leakage, abnormal pressure, or equipment failure are detected. This isolates the affected unit from the system, prevents the disaster from escalating, and ensures the safety of personnel, equipment, and the environment.

[0003] Due to the flammable and explosive nature of hydrogen, its small molecular size making it prone to leakage, and the need for high-pressure transportation, the corresponding quick-shutdown valves must meet higher standards in terms of type selection, drive control, and safety design. Currently, commonly used quick-shutdown valves at the outlet of hydrogen compressors include ball valves, gate valves, and globe valves. These valves are driven by pneumatic, electric, or electro-hydraulic actuators to ensure that the valves actuate within a specified time. Furthermore, this type of valve requires a separate safety control logic design, as well as safety redundancy design for control signals and power sources to ensure the reliability of valve operation.

[0004] However, existing quick-closing valves for hydrogen compressor outlets still have many shortcomings and cannot fully meet increasingly stringent safety and reliability requirements. First, existing quick-closing valves for hydrogen compressor outlets use a single-stem structure, which has poor guiding properties. Under conditions such as media impact, thermal deformation, or impurity deposition, it is prone to deflection, leading to valve stem jamming. This severely affects the normal opening and closing action of the valve core, and may even prevent rapid and reliable closure in emergency situations, posing a significant safety hazard. Second, the sealing design of existing quick-closing valves for hydrogen compressor outlets is prone to deterioration in sealing performance due to wear, aging, or stress relaxation of the seals under long-term frequent operation or harsh environments, leading to leakage risks. This not only affects the stable operation of the process system but may also cause flammable, explosive, or toxic media to leak, threatening the safety of personnel and the environment. Utility Model Content

[0005] This invention provides a quick shut-off valve for the outlet of a hydrogen compressor, which can significantly improve the operational reliability and sealing performance of the quick shut-off valve for the outlet of a hydrogen compressor, reduce maintenance requirements, and can also be used as a conventional on / off valve.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a quick-closing valve for the outlet of a hydrogen compressor, comprising a pressure-bearing housing, a valve core, a valve core support, a valve seat, an elastic element, a sealing element, and an actuator. The pressure-bearing housing forms a pressure boundary; the valve core, valve seat, and elastic element are all located within the pressure boundary, and the actuator is located outside the pressure boundary; the valve core has a medium channel passing through it, which passes through both the valve body and the valve cover; the valve core support includes an upper valve stem and a lower valve stem, one end of the upper valve stem being connected to one side of the valve core, and the other end passing through the upper pressure cover and extending to the outside of the pressure boundary to connect with the actuator, which drives the upper valve stem to rotate; the lower valve stem is located on the other side of the valve core and is coaxial with the upper valve stem, one end of the lower valve stem extending into the corresponding hole of the valve core, forming a freely rotatable fit with the valve core, and the other end extending into the corresponding hole of the valve body; the valve seat is installed on the valve body and the valve cover, and the valve seat and the valve core cooperate to form a sealing pair, which achieves a sealing effect by means of the elastic force of the elastic element or the medium pressure.

[0007] Furthermore, the pressure-bearing housing includes a valve body, a valve cover, an upper pressure cover, and a lower pressure cover. The valve body, valve cover, upper pressure cover, and lower pressure cover are connected to each other by fasteners, and a sealing element is provided at the connection gap. The pressure-bearing housing and the sealing element together form a complete pressure boundary.

[0008] Furthermore, the outer surface of the valve core is hardened to form a valve core sealing surface, and the surface of the valve seat that contacts the valve core is hardened to form a valve seat sealing surface; the valve core sealing surface and the valve seat sealing surface fit together to form a sealing pair; under the action of the elastic element or the medium pressure, the valve seat transmits the elastic force of the elastic element or the medium pressure to the valve core sealing surface through the valve seat sealing surface, thereby achieving the sealing of the sealing pair.

[0009] Furthermore, when the valve core rotates, the two valve seats remain relatively stationary, and there is relative frictional movement between the valve core sealing surface and the valve seat sealing surface.

[0010] Furthermore, the end of the upper valve stem connected to the valve core is a rod with a rectangular cross-section, and the connection between the valve core and the upper valve stem is a groove structure whose shape and size are coupled with the rectangular cross-section end of the upper valve stem. The rod-like structure with the rectangular cross-section of the upper valve stem is inserted into the groove structure of the valve core to realize the transmission of action and torque.

[0011] Furthermore, the sealing element includes a main seal and a secondary seal. The main seal is located inside the pressure boundary to form the first seal, and the secondary seal is located outside the main seal. When the main seal fails, the secondary seal constitutes a new pressure boundary and assumes the sealing function.

[0012] Furthermore, an inner sliding bearing and an outer sliding bearing are respectively fitted on the outer diameter of the upper valve stem. The inner sliding bearing is located inside the main seal, and the outer sliding bearing is located between the main seal and the secondary seal.

[0013] Furthermore, a stop is connected between the lower valve stem and the lower pressure cover to prevent the lower valve stem from rotating with the valve core.

[0014] Furthermore, the valve seat has an annular structure, and the valve seat achieves coaxial positioning with the medium channel through a positioning ring on the outer circumference of its large end.

[0015] Furthermore, the axis of the medium channel passes through the center of the valve core and is perpendicular to the axis of the upper valve stem.

[0016] Based on the above technical solution, the beneficial effects of this utility model are as follows: This invention employs a double-guided structure with the upper and lower valve stems coaxially arranged. The lower valve stem extends into the guide hole of the valve body, providing bottom support for the valve core. This structure effectively disperses the lateral forces on the valve stem, reducing deflection and jamming caused by media impact, thermal deformation, or impurity deposition. Especially under high pressure differentials or harsh operating conditions, it ensures linear movement of the valve core, improving the reliability of the hydrogen compressor outlet quick-shutdown valve in emergency situations. Simultaneously, this invention features a main seal and a secondary seal at the pressure boundary. The main seal acts as the first barrier against normal operating pressure, while the secondary seal acts as a secondary barrier to prevent media leakage even if the main seal fails. This double-seal design effectively improves the valve's sealing reliability and is suitable for critical process systems in petrochemical and natural gas industries involving flammable, explosive, toxic, or highly polluting materials. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structural assembly of this utility model; Figure 2 for Figure 1 A magnified view of a portion of point R shown in the diagram; Figure 3 for Figure 1 A magnified view of a portion of point S shown in the diagram; Figure 4 for Figure 1 The diagram shows a magnified view of a portion of point T.

[0018] The markings in the diagram are as follows: 1. Pressure housing, 101. Valve body, 102. Valve cover, 103. Upper pressure cover, 104. Lower pressure cover, 2. Valve core, 3. Valve core support, 301. Upper valve stem, 302. Lower valve stem, 4. Valve seat, 401. Positioning ring, 5. Elastic element, 6. Seal, 601. Main seal, 602. Secondary seal, 7. Actuator, 8. Sealing pair, 9. Medium passage, 11. Inner sliding bearing, 12. Outer sliding bearing, 13. Bracket, 14. Stop. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0021] like Figures 1-4 As shown, a quick-closing valve for the outlet of a hydrogen compressor includes a pressure-bearing housing 1, a valve core 2, a valve core support 3, a valve seat 4, an elastic element 5, a seal 6, an actuator 7, and a bracket 13. The pressure-bearing housing 1 includes a valve body 101, a valve cover 102, an upper pressure cover 103, and a lower pressure cover 104. The valve body 101, valve cover 102, upper pressure cover 103, and lower pressure cover 104 are interconnected by fasteners, and a seal 6 is provided at the connection gap. The seal 6 includes a main seal 601 and a secondary seal 602. The main seal 601 is located inside the pressure boundary, forming the first seal, and the secondary seal 602 is located outside the main seal 601. When the main seal 601 fails, the secondary seal 602 forms a new pressure boundary and assumes the sealing function. The housing structure formed by the pressure-bearing housing 1 and the seal 6 together constitutes a complete pressure boundary, which is used to isolate the internal medium from the external environment. There is a pressure difference on both sides of the pressure boundary, with the internal pressure being higher than the external pressure. The valve core 2, valve seat 4 and elastic element 5 are all located within the pressure boundary, and the actuator 7 is located outside the pressure boundary. The actuator 7 is mounted on the bracket 13 and can be driven by pneumatic or electric means.

[0022] The quick-shutdown valve is a ball valve, with the valve core 2 being a ball. The outer surface of the valve core 2 is hardened to form a valve core sealing surface, and the surface of the valve seat 4 that contacts the valve core 2 is hardened to form a valve seat sealing surface. The valve core sealing surface and the valve seat sealing surface fit together to form a sealing pair 8. The elastic element 5 is disposed between the valve seat 4 and the pressure-bearing housing 1 to provide preload. Under the action of the elastic element 5 or the medium pressure, the valve seat 4 transmits the elastic force of the elastic element 5 or the medium pressure to the valve core sealing surface through the valve seat sealing surface, thereby achieving the sealing of the sealing pair 8. The valve seat 4 has an annular structure, with the center of the medium channel 9 concentric with the outer circle of the valve seat 4. The valve seat 4 is mounted on the valve body 101 and the valve cover 102, and is coaxially positioned with the medium channel 9 by the positioning ring 401 on the outer circumference of its large end. When the valve core 2 rotates, the two valve seats 4 remain relatively stationary, and there is relative frictional movement between the valve core sealing surface and the valve seat sealing surface.

[0023] The valve core support 3 includes an upper valve stem 301 and a lower valve stem 302. One end of the upper valve stem 301 is connected to one side of the valve core 2, and the other end passes through the upper pressure cap 103 and extends to the outside of the pressure boundary to connect with the actuator 7. The actuator 7 is used to drive the upper valve stem 301 to rotate, thereby driving the valve core 2 to rotate, realizing the opening and closing of the valve. The end of the upper valve stem 301 connected to the valve core 2 is a rod with a rectangular cross-section. The connection between the valve core 2 and the upper valve stem 301 is a groove structure whose shape and size are coupled to the rectangular cross-section end of the upper valve stem 301. The rod-like structure with a rectangular cross-section of the upper valve stem 301 is inserted into the groove structure of the valve core 2 to realize the transmission of action and torque.

[0024] An inner sliding bearing 11 and an outer sliding bearing 12 are respectively fitted on the outer diameter of the upper valve stem 301. The inner sliding bearing 11 is located inside the main seal 601, i.e., inside the pressure boundary; the outer sliding bearing 12 is located between the main seal 601 and the secondary seal 602. The lower valve stem 302 is a cylindrical structure, located on the other side of the valve core 2, and coaxial with the upper valve stem 301. One end of the lower valve stem 302 extends into the corresponding hole of the valve core 2, forming a freely rotatable fit with the valve core 2, and the other end extends into the corresponding hole of the valve body 101. A stop 14 is connected between the lower valve stem 302 and the lower pressure cover 104 to prevent the lower valve stem 302 from rotating with the valve core 2.

[0025] The valve core 2 is provided with a medium channel 9 that passes through it. The medium channel 9 passes through both the valve body 101 and the valve cover 102. The axis of the medium channel 9 passes through the center of the valve core 2 and is perpendicular to the axis of the upper valve stem 301.

[0026] When an abnormal situation occurs in the device, an emergency shut-off command will be triggered. The actuator 7 will drive the upper valve stem 301 to rotate rapidly, causing the valve core 2 to rotate, so that the medium channel 9 of the valve core 2 is misaligned with the medium channel of the pipeline, thereby cutting off the hydrogen transmission and ensuring the safety of personnel and the environment.

[0027] It should be noted that the above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A hydrogen compressor outlet quick shut-off valve characterized by: It includes a pressure-bearing housing (1), a valve core (2), a valve core support (3), a valve seat (4), an elastic element (5), a seal (6), and an actuator (7), wherein the pressure-bearing housing (1) forms a pressure boundary; The valve core (2), valve seat (4) and elastic element (5) are all located within the pressure boundary, and the actuator (7) is located outside the pressure boundary; the valve core (2) is provided with a medium channel (9) that passes through it, and the medium channel (9) passes through both the valve body (101) and the valve cover (102). The valve core support (3) includes an upper valve stem (301) and a lower valve stem (302). One end of the upper valve stem (301) is connected to one side of the valve core (2), and the other end passes through the upper pressure cap (103) and extends to the outside of the pressure boundary to connect with the actuator (7). The actuator (7) is used to drive the upper valve stem (301) to rotate. The lower valve stem (302) is located on the other side of the valve core (2) and is coaxial with the upper valve stem (301). One end of the lower valve stem (302) extends into the corresponding hole of the valve core (2) and forms a freely rotatable fit with the valve core (2). The other end extends into the corresponding hole of the valve body (101). The valve seat (4) is installed on the valve body (101) and the valve cover (102). The valve seat (4) and the valve core (2) cooperate to form a sealing pair (8), and the sealing pair (8) produces a sealing effect by means of the elastic force of the elastic element (5) or the medium pressure.

2. A hydrogen compressor outlet quick shutoff valve according to claim 1, characterized in that: The pressure-bearing housing (1) includes a valve body (101), a valve cover (102), an upper pressure cover (103), and a lower pressure cover (104). The valve body (101), valve cover (102), upper pressure cover (103), and lower pressure cover (104) are connected to each other by fasteners, and a sealing element (6) is provided at the connection gap. The housing structure formed by the pressure-bearing housing (1) and the sealing element (6) together constitutes a complete pressure boundary.

3. The hydrogen compressor outlet quick-cut-off valve according to claim 1, characterized in that: The outer surface of the valve core (2) is hardened to form a valve core sealing surface, and the surface of the valve seat (4) that contacts the valve core (2) is hardened to form a valve seat sealing surface; the valve core sealing surface and the valve seat sealing surface are fitted together to form a sealing pair (8). Under the action of the elastic element (5) or the medium pressure, the valve seat (4) transmits the elastic force of the elastic element (5) or the medium pressure to the valve core sealing surface through the valve seat sealing surface, thereby achieving the sealing of the sealing pair (8).

4. A quick-closing valve for the outlet of a hydrogen compressor according to claim 3, characterized in that: When the valve core (2) rotates, the two valve seats (4) remain relatively stationary, and there is relative frictional movement between the valve core sealing surface and the valve seat sealing surface.

5. A quick-closing valve for the outlet of a hydrogen compressor according to claim 1, characterized in that: The upper valve stem (301) is connected to the valve core (2) at one end, which is a rod with a rectangular cross-section. The connection between the valve core (2) and the upper valve stem (301) is a groove structure whose shape and size are coupled to the rectangular cross-section end of the upper valve stem (301). The rod-shaped structure of the rectangular cross-section of the upper valve stem (301) is inserted into the groove structure of the valve core (2) to realize the transmission of action and torque.

6. A quick-closing valve for the outlet of a hydrogen compressor according to claim 1, characterized in that: The sealing element (6) includes a main seal (601) and a secondary seal (602). The main seal (601) is located inside the pressure boundary to form the first seal, and the secondary seal (602) is located outside the main seal (601). When the main seal (601) fails, the secondary seal (602) constitutes a new pressure boundary and assumes the sealing function.

7. A quick-closing valve for the outlet of a hydrogen compressor according to claim 6, characterized in that: The upper valve stem (301) is fitted with an inner sliding bearing (11) and an outer sliding bearing (12) on its outer diameter. The inner sliding bearing (11) is located inside the main seal (601), and the outer sliding bearing (12) is located between the main seal (601) and the secondary seal (602).

8. A hydrogen compressor outlet quick-cut-off valve according to claim 1, characterized in that: A stop (14) is connected between the lower valve stem (302) and the lower pressure cover (104) to prevent the lower valve stem (302) from rotating with the valve core (2).

9. A quick-closing valve for the outlet of a hydrogen compressor according to claim 1, characterized in that: The valve seat (4) has an annular structure, and the valve seat (4) is coaxially positioned with the medium channel (9) through the positioning ring (401) on the outer circumference of its large end.

10. A hydrogen compressor outlet quick-cut-off valve according to claim 1, characterized in that: The axis of the medium channel (9) passes through the center of the valve core (2) and is perpendicular to the axis of the upper valve stem (301).

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