A valve with stepped temperature and pressure limiting sealing structure

Abstract

The present application relates to the technical field of valve, especially to a valve with step temperature and pressure limiting sealing structure, comprising a valve body, which is internally provided with a valve rod and a first spring sleeved on the valve rod; a valve cover is located above the valve body and is sealingly connected with the valve body, which is internally provided with a driving member connected with the valve rod, the valve rod is driven to move up and down by the rotation of the driving member, the driving member and the valve cover form a sealing surface by mutual pushing due to the pushing force of the first spring and the valve core and the valve seat, the driving member and the valve cover have a throttling channel, and the driving member is provided with a first sealing ring above the driving member to form a step temperature and pressure limiting sealing structure; a valve cap is located above the valve cover and is sealingly connected with the valve cover through a gland structure, the valve cap drives the driving member to rotate from outside the valve; the valve body, the valve cover and the valve cap form a complete continuous body sealing structure, which, in combination with the sealing surface of the driving member mechanism, the throttling channel and the step sealing structure of the sealing ring, not only ensures the sealing performance of the valve, but also meets the use requirements of organic elastomer materials such as rubber.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a valve with a stepped temperature and pressure limiting sealing structure. Background Technology

[0002] As control components in pipeline fluid transport systems, valves are used to control parameters such as fluid direction, pressure, and flow rate. The sealing performance of valves, especially their external sealing performance, is very important.

[0003] Traditional fillers such as graphite have poor sealing performance, are prone to wear and have a short service life. They also pose a risk of leakage because they cannot form a complete continuous sealing system. Although organic elastomer materials such as rubber have better sealing performance and service life than fillers such as graphite, they cannot be used in high-temperature media due to their poor temperature resistance, which limits their application environment. Summary of the Invention

[0004] The purpose of this invention is to provide a valve with a stepped temperature and pressure limiting sealing structure, which can solve the leakage problem of traditional packing seal systems. By utilizing a stepped temperature and pressure limiting sealing structure that provides throttling, heat insulation, and heat dissipation, the temperature at the sealing structure is reduced, meeting the requirements of organic elastomer materials such as rubber in high-temperature media applications, thereby achieving better sealing performance and a longer service life. To achieve the above objective, this invention is implemented through the following technical solution.

[0005] This invention provides a valve with a stepped temperature and pressure limiting sealing structure, comprising:

[0006] The valve body contains a valve stem and a first spring sleeved on the valve stem.

[0007] The valve cover is located above the valve body and is sealed to it. It contains a drive component connected to the valve stem. The rotation of the drive component drives the valve stem to move up and down. The first spring pushes and the valve core and valve seat push the drive component to form a top-to-top sealing surface between the drive component and the valve cover. There is a throttling channel between the drive component and the valve cover, and a first sealing ring is provided above the drive component to form a stepped temperature and pressure limiting seal.

[0008] A valve cap is located above the valve cover and is sealed to it through a pressure cap structure. The valve cap drives the drive component to rotate from outside the valve.

[0009] As a further implementation, the drive member is located inside the valve cover and threadedly engaged with the valve stem, and the first spring is sleeved on the valve stem to push against the drive member.

[0010] As a further implementation, one end of the drive member extends into the valve body and is threadedly engaged with the valve stem, and the first spring transmits thrust to the drive member by pushing against the valve stem.

[0011] As a further implementation, the valve cap and the valve cover are provided with a second sealing ring on their contact surfaces, and a pressure cap structure is provided between them and is pressed together by the elastic force of the second spring thereon.

[0012] As a further implementation, the pressure cap structure includes an upper pressure cap and a lower pressure cap connected by bolts, and the second spring is disposed between the lower pressure cap and the valve cover.

[0013] As a further implementation, the valve cap and the valve cover are provided with a second sealing ring, and the two are tightened by screwing on a pressure cap structure.

[0014] As a further implementation, the valve cap can be rotated manually or automatically.

[0015] As a further implementation, the valve cap is keyed to the drive element.

[0016] As a further implementation, the outer wall of the valve cover is provided with heat dissipation fins.

[0017] As a further implementation, a heat-insulating sealing gasket is provided between the valve cover and the valve body.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. In this invention, the valve cap, valve cover, and valve body form a continuous and complete seal. The drive component and valve body form a sealing structure at the sealing surface. The sealing performance of the sealing surface is ensured by the top-to-top design of the sealing surface, valve core, and valve seat, as well as the thrust of the first spring. The throttling channel formed by the drive component and the valve body forms a throttling sealing structure. The good cooperation between the valve body and the drive component plays the role of sealing and throttling. Therefore, the heat insulation gasket, sealing surface, throttling channel, first sealing ring, second sealing ring, and valve cap sequentially provide stepped temperature and pressure limiting seals for the medium from bottom to top. Furthermore, the valve body, heat insulation gasket, valve cover, and valve cap form a continuous and complete seal, ensuring the sealing performance of the valve.

[0020] 2. The heat-insulating sealing gasket, heat sink, sealing surface, and throttling channel of this invention significantly reduce the heat transfer coefficient of the valve and slow down the heat transfer rate through throttling and heat insulation. The temperature of the medium reaching the upper sealing ring is reduced, which meets the requirements of rubber and other organic elastomer materials and achieves a better sealing effect and a longer service life than the filler seal of materials such as graphite.

[0021] 3. In this invention, the valve cap and valve cover are connected and fitted through a gland structure. The gland structure is directly threaded to the valve cover to ensure the sealing performance of the valve cap and valve cover. Alternatively, the upper and lower glands and springs can maintain a certain pressure on the valve cap and valve cover to ensure sealing performance. At the same time, the structure of the upper and lower glands and springs can ensure the pressure required for sealing the valve cap and valve body without affecting the rotation of the valve cap, thus achieving the function of ensuring sealing without affecting the opening and closing of the valve.

[0022] 4. In this invention, the sealing surface and the valve core and valve seat form an opposing structure. Combined with the thrust of the first spring on the driving component, sufficient pressure is ensured at the sealing surface to achieve the functions of sealing and throttling. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] Figure 1 A schematic diagram of the valve structure in Embodiment 1 of the present invention is shown;

[0025] Figure 2 A schematic diagram of the valve structure with automatic drive mode in Embodiment 1 of the present invention is shown;

[0026] Figure 3 A schematic diagram of a valve structure with manual and automatic combined drive mechanism is shown in Embodiment 1 of the present invention;

[0027] Figure 4 A schematic diagram of the valve structure in Embodiment 2 of the present invention is shown;

[0028] Figure 5 A schematic diagram of the valve structure in Embodiment 3 of the present invention is shown;

[0029] Figure 6 A schematic diagram of the valve structure with automatic drive mode in Embodiment 3 of the present invention is shown;

[0030] Figure 7 A schematic diagram of the valve structure with manual and automatic combined drive mode in Embodiment 3 of the present invention is shown;

[0031] Figure 8 A schematic diagram of the valve structure in Embodiment 4 of the present invention is shown.

[0032] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0033] The components are as follows: 1. Valve cap; 2. Gland structure; 2-1. Upper gland; 2-2. Lower gland; 3. Drive component; 4. Throttling channel; 5. Sealing surface; 6. Thermal insulation gasket; 7. First spring; 8. Inlet; 9. Valve core; 10. Valve seat; 11. Valve body; 12. Outlet; 13. Bushing; 14. Valve stem; 15. Valve cover; 16. Heat sink; 17. First sealing ring; 18. Second sealing ring; 19. Second spring. Detailed Implementation

[0034] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0035] Example 1

[0036] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a valve with a stepped temperature and pressure limiting sealing structure includes a valve body 11, a valve cover 15, and a valve cap 1.

[0037] The valve body 11 is equipped with a valve stem 14 and a first spring 7; in addition, the valve body 11 also has an inlet 8, a valve core 9, a valve seat 10, and an outlet 12. The valve core 9 is located at the bottom of the valve stem 14 and controls the opening and closing of the valve.

[0038] The valve cover 15 is located above the valve body 11 and is sealed to it. A heat-insulating sealing gasket 6 is provided between the valve cover 15 and the valve body 11 to seal and block heat transfer. The valve body 11 and the valve cover 15 are connected by bolts, or by welding, threaded connection, clamp connection or other connection methods.

[0039] The valve cover 15 is equipped with a drive component 3 connected to the valve stem 14. The drive component 3 is completely located inside the valve cover 15. The valve stem 14 and the drive component 3 are connected by threads. The drive component 3 has internal threads, and the valve stem 14 has external threads. The rotation of the drive component 3 causes the valve stem 14 to move up and down through the threads. The valve stem 14 drives the valve core 9 to move up and down, controlling the contact and separation of the valve core 9 and the valve seat 10, thereby realizing the function of opening and closing the valve.

[0040] The first spring 7 is sleeved on the valve stem 14 and pushes the drive member 3. The push of the first spring 7 and the thrust of the valve core and valve seat on the drive member 3 make the drive member 3 and the valve cover 15 form a sealing surface 5. One end of the first spring 7 is in contact with the valve body 11 and the other end is in contact with the bushing 13. The bushing 13 is sleeved on the valve stem 14. The first spring 7 is in a compressed state and pushes the drive member 3 upward through the bushing 13. The drive member 3 and the valve cover 15 form a sealing surface 5. The sealing surface 5 achieves a sealing effect under the action of the push of the first spring 7 and the push of the valve core 9 and valve seat 10.

[0041] A throttling channel 4 is provided between the drive component 3 and the valve cover 15. The throttling channel 4 is as small as possible in the radial direction and as long as possible in the axial direction to achieve the functions of throttling and cooling. A first sealing ring 17 is provided between the drive component 3 and the valve cover 15 and is positioned above the throttling channel 4 to ensure a seal between the drive component 3 and the valve cover 15.

[0042] The outer wall of the valve cover 15 is provided with heat dissipation fins 16, which can accelerate heat dissipation.

[0043] The valve cap 1 is located above the valve cover 15 and is sealed to it through the gland structure 2. The valve cap 1 drives the drive component 3 to rotate from outside the valve. The contact surface between the valve cap 1 and the valve cover 15 is provided with a second sealing ring 18 to ensure its sealing performance. The gland structure 2 is provided between the two and is pressed together by the elastic force of its second spring 19.

[0044] In this embodiment, the valve cap 1 and the valve cover 15 are connected by the pressure cap structure 2, so that the valve cap 1, the valve cover 15, and the valve body 11 form a continuous and complete seal. The drive member 3 and the valve body 11 form a sealing structure at the sealing surface 5. The sealing performance of the sealing surface 5 is guaranteed by the top-down design of the sealing surface 5, the valve core 9, and the valve seat 10, as well as the thrust of the first spring 7. The throttling channel 4 formed by the drive member 3 and the valve body 11 forms a throttling sealing structure. The good cooperation between the valve body 11 and the drive member 3 plays the role of sealing and throttling. Therefore, the heat insulation sealing gasket 6, the sealing surface 5, the throttling channel 4, the first sealing ring 17, the second sealing ring 18, and the valve cap 1 seal the medium in a stepwise manner from bottom to top. The valve body 11, the heat insulation sealing gasket 6, the valve cover 15, and the valve cap 1 form a continuous and complete seal, ensuring the sealing performance of the valve.

[0045] The sealing surface 5 and the throttling channel 4, while providing a sealing function, slow down the heat transfer to the upper part of the valve cover 15 due to the throttling effect. At the same time, the heat sink 16 structure accelerates the heat dissipation of the valve cover 15. In addition, the heat insulation effect of the heat insulation sealing gasket, under the multiple effects of heat insulation, heat dissipation and flow restriction, the temperature at the first sealing ring 17 and the second sealing ring 18 is reduced, which meets the requirements for the use of elastic sealing materials. The sealing performance and life of organic elastomer sealing materials such as rubber are better than those of graphite packing seals.

[0046] The gland structure 2 includes an upper gland 2-1 and a lower gland 2-2 connected by bolts. A second spring 19 is located between the lower gland 2-2 and the valve cover 15. The second spring 19 is in a compressed state to ensure that the upper gland 2-1 and the lower gland 2-2 exert appropriate pressure on the valve cap 1 and the valve cover 15. This pressure can ensure the seal between the valve cap 1 and the valve cover 15 without affecting the rotation of the valve cap 1.

[0047] The upper pressure cover 2-1 and the lower pressure cover 2-2 are connected by bolts, but can also be connected by welding, threaded connection, clamp connection or other connection methods. The valve cap 1 and the drive component 3 are connected by a square key, so that the valve cap 1 can drive the drive component 3 to rotate. During normal operation, the handwheel drives the valve cap 1 to rotate, the valve cap 1 drives the drive component 3 to rotate, and the drive component 3 moves the valve stem 14 up and down through the thread, thereby causing the valve core 9 and the valve seat 10 to contact and separate, controlling the flow of the medium from the inlet 8 and the outlet 12, and controlling the opening and closing of the valve.

[0048] like Figure 2 As shown, one driving method in this embodiment is to use an electric, pneumatic or other automatic control device to drive the valve cap 1 to rotate, thereby realizing the opening and closing of the valve.

[0049] like Figure 3 As shown, one driving mechanism in this embodiment is a combination of a handwheel and an electric, pneumatic, or other automatic control device. The valve can be opened and closed by selecting one of these mechanisms as needed.

[0050] The drive component 3, the heat-insulating sealing gasket 6, and the bushing 13 are made of materials with low heat transfer coefficients to prevent heat from being transferred upwards. The valve cover 15 is made of a material with good heat dissipation to enhance the dissipation of heat from the valve cover 15.

[0051] Example 2

[0052] like Figure 5 As shown, compared with the valve structure in Embodiment 1, the valve structure in this embodiment has the following changes: the drive member 3 extends into the valve body 11 in the axial direction; the connection between the drive member 3 and the valve stem 14 is inside the valve body; and the threaded connection between the drive member 3 and the valve stem 14 is changed from the internal thread of the drive member 3 and the external thread of the valve stem 14 in Embodiment 1 to the external thread of the drive member 3 and the internal thread of the valve stem 14 in this embodiment. One end of the first spring 7 contacts the valve body 11, and the other end contacts the valve stem 14, transmitting the thrust to the sealing surface 5 of the drive member mechanism through the valve stem 14.

[0053] like Figure 6 As shown, one driving method in this embodiment is to use an electric, pneumatic or other automatic control device to drive the valve cap to rotate, thereby realizing the opening and closing of the valve.

[0054] like Figure 7 As shown, one driving mechanism in this embodiment is a combination of a handwheel and an electric, pneumatic, or other automatic control device. The valve can be implemented by selecting one of these mechanisms as needed.

[0055] Example 3

[0056] like Figure 4As shown, unlike Embodiment 1, the only difference is in the gland structure 2. In this embodiment, the gland structure 2 is directly threaded to the valve cover 15 and tightened by screwing. The sealing between the valve cap 1 and the valve cover 15 is achieved by the tightening force of the threads. When the valve performs an opening and closing action, the gland structure 2 opens; when the valve is operating normally without performing an opening and closing action, the gland structure 2 tightens, resulting in a better sealing effect.

[0057] Example 4

[0058] like Figure 8 As shown, the valve structure in this embodiment differs from that in embodiment two only in the gland structure 2. In this embodiment, the gland structure 2 is directly threaded to the valve cover 15, and the sealing between the valve cap 1 and the valve cover 15 is achieved by the tightening force of the threads. When the valve performs the opening and closing action, the gland structure 2 opens, and when the valve is working normally without performing the opening and closing action, the gland structure 2 is tightened, resulting in a better sealing effect.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A valve with a stepped temperature and pressure limiting sealing structure, characterized in that, include: The valve body contains a valve stem and a first spring sleeved on the valve stem. A valve cover, located above and sealed to the valve body, contains a drive component connected to the valve stem. Rotation of the drive component causes the valve stem to move up and down. A first spring has one end in contact with the valve body and the other end in contact with a bushing. The bushing is fitted onto the valve stem. The first spring is in a compressed state, providing an upward thrust to the drive component through the bushing. The push from the first spring and the thrust from the valve core and seat create a sealing surface between the drive component and the valve cover. A throttling channel exists between the drive component and the valve cover, and a first sealing ring is located above the drive component to form a stepped temperature and pressure limiting seal. The throttling channel is as small as possible radially and as long as possible axially. A valve cap is located above the valve cover and is sealed to it via a gland structure. The valve cap drives the drive component to rotate from outside the valve. The valve cap and the valve cover are provided with a second sealing ring at their contact surfaces; A heat-insulating sealing gasket is provided between the valve cover and the valve body; a heat dissipation fin is provided on the outer wall of the valve cover; The thermal insulation gasket, the top sealing surface, the throttling channel, the first sealing ring, the second sealing ring, and the valve cap sequentially provide stepped temperature and pressure limiting sealing for the medium from bottom to top.

2. The valve with a stepped temperature and pressure limiting sealing structure according to claim 1, characterized in that, One end of the drive component extends into the valve body and is threaded into the valve stem.

3. A valve with a stepped temperature and pressure limiting sealing structure according to claim 1, characterized in that, The pressure cap structure includes an upper pressure cap and a lower pressure cap connected by bolts, and a second spring is disposed between the lower pressure cap and the valve cover.

4. A valve with a stepped temperature and pressure limiting sealing structure according to claim 1 or 2, characterized in that, The valve cap and the valve cover are tightened together by a pressure cap structure.

5. A valve with a stepped temperature and pressure limiting sealing structure according to claim 1, characterized in that, The valve cap can be rotated manually or automatically.

6. A valve with a stepped temperature and pressure limiting sealing structure according to claim 5, characterized in that, The valve cap is keyed to the drive component.

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