Valve body assembly and safety valve

Abstract

The valve body assembly comprises a valve element and a valve seat, the valve element is provided with a first end face, the valve seat is provided with a second end face, the first end face and the second end face are oppositely arranged, one of the first end face and the second end face is provided with an annular protrusion, and the annular protrusion is provided with an annular groove. An annular groove is formed in the other one of the first end face and the second end face, and at least part of the annular protrusion extends into the annular groove and is in sealing fit with the annular groove. According to the valve body assembly and the safety valve, it can be effectively guaranteed that the zero-leakage sealing effect is achieved under the set pressure of%, the leakage amount of the safety valve in the high-temperature and high-pressure environment is greatly reduced, loss of working media and increase of energy consumption are avoided, and pollution to the environment is relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power safety valve, in particular to a valve body assembly and a safety valve. BACKGROUND

[0002] In a high-temperature and high-pressure environment such as a nuclear power plant, the sealing performance of the safety valve as an important safety protection device is directly related to the safe operation of the system. In the related art, the safety valve needs to maintain a sealing effect of zero leakage at 95% of the set pressure to prevent the loss of working medium, the increase of energy consumption, and the pollution to the environment. However, the sealing pressure between the valve disc and the valve seat of the safety valve is small, and the pressure difference between the opening and the sealing is not large, which makes it difficult for the metal sealing surface of the safety valve to achieve no leakage and poor sealing. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0004] To this end, an embodiment of the present application proposes a valve body assembly and a safety valve.

[0005] The valve body assembly of the embodiment of the present application comprises a valve core and a valve seat, the valve core has a first end face, the valve seat has a second end face, the first end face and the second end face are oppositely arranged, one of the first end face and the second end face is provided with an annular protrusion, the other of the first end face and the second end face is provided with an annular groove, at least part of the annular protrusion extends into the annular groove and sealingly cooperates with the annular groove.

[0006] In some embodiments, the height of the annular protrusion is greater than the depth of the annular groove, and the top end face of the annular protrusion abuts on the groove bottom wall of the annular groove.

[0007] In some embodiments, the difference between the height of the annular protrusion and the depth of the annular groove is greater than or equal to 1mm.

[0008] In some embodiments, the annular groove has first and second groove side walls which are radially opposite to the annular protrusion, the inner circumferential surface of the annular protrusion is arranged close to the first groove side wall relative to the outer circumferential surface of the annular protrusion, the inner circumferential surface of the annular protrusion is spaced apart from the first groove side wall, and the outer circumferential surface of the annular protrusion is spaced apart from the second groove side wall.

[0009] In some embodiments, the spacing between the inner circumferential surface of the annular protrusion and the first groove side wall is the same as the spacing between the outer circumferential surface of the annular protrusion and the second groove side wall.

[0010] In some embodiments, the inner circumferential surface of the annular protrusion is spaced apart from the first groove sidewall by a distance of 1 mm or more; and / or the outer circumferential surface of the annular protrusion is spaced apart from the second groove sidewall by a distance of 1 mm or more.

[0011] In some embodiments, the thickness of the annular protrusion is 3 mm or more.

[0012] In some embodiments, the cross section of the annular protrusion is rectangular or trapezoidal.

[0013] In some embodiments, there are a plurality of annular protrusions, which are arranged at intervals in the radial direction, and there are a plurality of annular grooves, which are matched one-to-one with the plurality of annular protrusions.

[0014] The safety valve of the embodiment of the present application comprises a guide sleeve and the valve body assembly of any of the above embodiments, and the guide sleeve is connected to the valve core guide.

[0015] In use, the first end surface of the valve core and the second end surface of the valve seat are arranged opposite each other, one of which is provided with an annular protrusion, and the other of which is provided with an annular groove. When the safety valve is in a closed state, i.e., the valve core and the valve seat are closed, at least part of the annular protrusion extends into the annular groove, achieving a sealing fit and forming an effective sealing barrier.

[0016] The annular protrusion and the annular groove arranged between the valve core and the valve seat cooperate to seal, increasing the sealing contact area and improving the contact pressure of the sealing surface. At the same time, the length and complexity of the flow path of the medium flow path are also increased, increasing the flow resistance and helping to prevent leakage of the medium under high pressure. In addition, condensate is formed between the sealing surfaces of the annular protrusion and the annular groove, and the presence of the condensate can improve the wettability of the sealing surface, reduce the wear of the sealing surface, and further improve the sealing effect.

[0017] Thus, the valve body assembly of the embodiment of the present application can effectively ensure that the sealing effect of zero leakage is achieved at the set pressure, so that the leakage of the safety valve under high temperature and high pressure environment is greatly reduced, which not only avoids the increase of the loss of working medium and energy consumption, but also reduces the pollution to the environment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the valve body assembly of the first embodiment of the present application,

[0019] Figure 2 is Figure 1 an enlarged schematic diagram of part A in

[0020] Figure 3 is a structural schematic diagram of the valve body assembly of the second embodiment of the present application,

[0021] Figure 4 is Figure 3 an enlarged schematic view of part B in figure 1.

[0022] Reference signs:

[0023] 100, valve body assembly; 200, guide sleeve; 1, valve core; 101, first end face; 2, valve seat; 201, second end face; 3, annular protrusion; 4, annular groove; 401, first groove side wall; 402, second groove side wall. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the examples of embodiments are shown in the accompanying drawings. The embodiments described below with reference to the attached drawing figures are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0025] As Figures 1 to 4 shown, the valve body assembly 100 of the embodiment of the present application comprises a valve core 1 and a valve seat 2, the valve core 1 has a first end face 101, and the valve seat 2 has a second end face 201, the first end face 101 and the second end face 201 are oppositely arranged. One of the first end face 101 and the second end face 201 is provided with an annular protrusion 3, and the other of the first end face 101 and the second end face 201 is provided with an annular groove 4, at least part of the annular protrusion 3 extends into the annular groove 4 and sealingly cooperates with the annular groove 4.

[0026] For example, as Figure 2 shown, the annular protrusion 3 is arranged on the first end face 101, and the annular groove is arranged on the second end face 201. Alternatively, as Figure 2 shown, the annular protrusion 3 is arranged on the second end face 201, and the annular groove is arranged on the first end face 101.

[0027] In use, the valve body assembly 100 of the embodiment of the present application, the first end face 101 of the valve core 1 and the second end face 201 of the valve seat 2 are oppositely arranged, one of which is provided with the annular protrusion 3, and the other of which is provided with the annular groove 4. When the safety valve is in a closed state, i.e. the valve core 1 and the valve seat 2 are closed, at least part of the annular protrusion 3 extends into the annular groove 4, realizes sealing cooperation, and forms an effective sealing barrier.

[0028] The annular protrusion 3 and the annular groove 4 between the valve core 1 and the valve seat 2 cooperate to seal, increase the sealing contact area, and improve the contact pressure of the sealing surface. At the same time, the travel of the medium flow path, i.e. the length and complexity of the flow path, is also increased, the flow resistance is increased, which helps to prevent the medium from leaking under high pressure. In addition, condensate will be formed between the sealing surfaces of the annular protrusion 3 and the annular groove 4, the presence of the condensate can improve the wettability of the sealing surface, reduce the wear of the sealing surface, and further improve the sealing effect.

[0029] Therefore, the valve body assembly 100 of the embodiment of the present application can effectively ensure that the sealing effect of zero leakage is achieved at 95% of the set pressure, so that the leakage of the safety valve in a high-temperature and high-pressure environment is greatly reduced, which not only avoids the loss of working medium and the increase of energy consumption, but also reduces the pollution to the environment.

[0030] In some embodiments, the height of the annular protrusion 3 is greater than the depth of the annular groove 4, and the top end surface of the annular protrusion 3 abuts against the groove bottom wall of the annular groove 4.

[0031] Since the height of the annular protrusion 3 is greater than the depth of the annular groove 4, when the safety valve is closed, the top end surface of the annular protrusion 3 can tightly abut against the groove bottom wall of the annular groove 4, increasing the tightness of the sealing contact and providing better sealing effect, which can effectively prevent leakage of the medium even in a high-pressure and high-temperature environment. The tight contact between the top of the annular protrusion 3 and the bottom of the groove increases the pressure resistance of the sealing surface, which can withstand higher system pressure, ensuring that the safety valve can work reliably under higher pressure conditions. Since the top end surface of the annular protrusion 3 directly contacts the groove bottom wall, this contact mode can reduce wear during relative movement, thereby prolonging the service life of the safety valve.

[0032] In some embodiments, the difference between the height of the annular protrusion 3 and the depth of the annular groove 4 is greater than or equal to 1 mm.

[0033] In a high-temperature and high-pressure environment, the condensation effect between the sealing surfaces of the safety valve is crucial to the sealing performance. A larger height difference helps to form a condensate film between the sealing surfaces, further improving the sealing effect. The setting of the difference makes the manufacturing process easier to control, and also simplifies the maintenance work, because a larger difference provides a larger tolerance range, making the installation and replacement process more fault-tolerant.

[0034] In some embodiments, the annular groove 4 has a first groove side wall 401 and a second groove side wall 402 opposite along the radial direction of the annular protrusion 3, the inner circumferential surface of the annular protrusion 3 is arranged close to the first groove side wall 401 relative to the outer circumferential surface of the annular protrusion 3, the inner circumferential surface of the annular protrusion 3 is spaced apart from the first groove side wall 401, and the outer circumferential surface of the annular protrusion 3 is spaced apart from the second groove side wall 402.

[0035] As Figure 2 and Figure 4As shown, the inner circumferential surface of the annular protrusion 3 is arranged close to the first groove side wall 401, and maintains a certain interval with the first groove side wall 401. The outer circumferential surface of the annular protrusion 3 is arranged spaced from the second groove side wall 402, that is, the outer circumferential surface does not directly contact the second groove side wall 402, but maintains a certain interval. This allows the valve core 1 to swing in the radial direction of the annular protrusion 3 during use, while effectively ensuring the sealing effect, so that the opening and closing actions of the valve core 1 are more flexible, and at the same time, the wear between the inner and outer circumferential surfaces of the annular protrusion 3 and the groove side walls of the annular groove 4 can be reduced.

[0036] In some embodiments, the interval between the inner circumferential surface of the annular protrusion 3 and the first groove side wall 401 is the same as the interval between the outer circumferential surface of the annular protrusion 3 and the second groove side wall 402.

[0037] The same interval design ensures that the inner and outer circumferential surfaces of the annular protrusion 3 are subjected to uniform sealing pressure, which helps to form a uniform sealing effect on the entire sealing surface, thereby reducing the possibility of leakage. Since the intervals of the inner and outer circumferential surfaces are the same, the annular protrusion 3 can evenly share the force when subjected to pressure, which helps to improve the mechanical properties and stability of the entire structure. The uniform interval design helps to improve the reliability of the safety valve during long-term operation, because this design can reduce the risk of damage or deformation of the sealing surface caused by uneven pressure.

[0038] Optionally, the interval between the inner circumferential surface of the annular protrusion 3 and the first groove side wall 401 is greater than or equal to 1 mm.

[0039] It should be noted that since the gap between the valve core 12 and the guide sleeve 200 is at most 0.8 mm, the interval between the inner circumferential surface of the annular protrusion 3 and the first groove side wall 401 is greater than or equal to 1 mm, so that the valve core 1 and the valve seat 2 can have sufficient gap for the annular protrusion 3 to move during contact or separation, thereby reducing or even avoiding friction between the annular protrusion 3 and the groove side wall of the annular groove 4, and thereby facilitating improvement of the service life of the valve core assembly 100.

[0040] Optionally, the interval between the outer circumferential surface of the annular protrusion 3 and the second groove side wall 402 is greater than or equal to 1 mm.

[0041] Similarly, since the gap between the valve core 12 and the guide sleeve 200 is at most 0.8 mm, the interval between the outer circumferential surface of the annular protrusion 3 and the second groove side wall 402 is greater than or equal to 1 mm, so that the valve core 1 and the valve seat 2 can have sufficient gap for the annular protrusion 3 to move during contact or separation, thereby reducing or even avoiding friction between the annular protrusion 3 and the groove side wall of the annular groove 4, and thereby facilitating improvement of the service life of the valve core assembly 100.

[0042] In some embodiments, the thickness of the annular protrusion 3 is greater than or equal to 3 mm.

[0043] The thicker annular protrusions 3 can provide higher structural strength and durability, enabling them to withstand mechanical stress under extreme working conditions such as high temperature and high pressure. The thicker annular protrusions 3 can better resist wear during the opening and closing process, thereby extending the service life of the safety valve. The thicker annular protrusions 3 can withstand higher pressure, which is crucial for the reliable operation of the safety valve in high-pressure environments. In high-temperature environments, the thicker annular protrusions 3 can better maintain their shape and size stability, reducing problems caused by thermal expansion. The thicker annular protrusions 3 can provide better sealing effect, especially in high-pressure differential conditions, which can more effectively prevent medium leakage. When subjected to impact or vibration, the thicker annular protrusions 3 can better absorb and disperse energy, reducing damage caused by impact.

[0044] Optionally, the cross-section of the annular protrusion 3 is rectangular or trapezoidal.

[0045] The rectangular or trapezoidal cross-section can provide better wear resistance, helping to extend the service life of the safety valve. This design helps to optimize the fluid dynamics characteristics, reducing the resistance of the fluid passing through the safety valve, and reducing energy loss.

[0046] In some embodiments, the number of annular protrusions 3 is multiple, and the multiple annular protrusions 3 are arranged radially spaced, and the number of annular grooves 4 is multiple, and the multiple annular protrusions 3 and the multiple annular grooves 4 are one-to-one corresponding and matched.

[0047] The matching of multiple annular protrusions 3 and grooves increases the total sealing area, which helps to improve the sealing performance, especially in high-pressure differential conditions. The design of multiple sealing points increases the redundancy of the seal, even if some sealing points fail, other sealing points can still maintain a certain sealing performance, thereby improving the overall safety and reliability. The radial spacing of multiple annular protrusions 3 can optimize the pressure distribution, making the pressure more uniform on the entire sealing surface, which helps to improve the sealing effect. The existence of multiple sealing points enables the safety valve to better adapt to different working conditions, including temperature changes, pressure fluctuations, and the influence of different media. Since the pressure is distributed on multiple sealing points, the wear of each sealing point will be correspondingly reduced, thereby extending the service life of the safety valve. The design of multiple sealing points helps to disperse impact load, reducing the risk of damage caused by impact. In high-temperature environments, the existence of multiple sealing points helps to maintain the stability of the entire sealing structure, reducing problems caused by thermal expansion. By increasing the sealing area and improving the sealing reliability, the overall safety of the safety valve can be further improved, which is crucial for the safe operation of key facilities such as nuclear power plants.

[0048] The safety valve of the embodiment of the present application comprises a guide sleeve 200 and the valve body assembly 100 in any of the above embodiments, and the guide sleeve 200 is connected with the valve core 1 in a guide mode.

[0049] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0050] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0051] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0053] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising but not limited to, that is, it is open-ended and does not exclude the presence of additional features, structures, materials, or characteristics.

[0054] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present disclosure, and the ordinary skilled in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present disclosure.

Claims

1. A valve body assembly, characterized in that, The valve includes a valve core (1) and a valve seat (2). The valve core (1) has a first end face (101) and the valve seat (2) has a second end face (201). The first end face (101) and the second end face (201) are arranged opposite to each other. One of the first end face (101) and the second end face (201) is provided with an annular protrusion (3), and the other of the first end face (101) and the second end face (201) is provided with an annular groove (4). At least a portion of the annular protrusion (3) extends into the annular groove (4) and is sealed to the annular groove (4).

2. The valve body assembly according to claim 1, characterized in that, The height of the annular protrusion (3) is greater than the depth of the annular groove (4), and the top surface of the annular protrusion (3) abuts against the bottom wall of the annular groove (4).

3. The valve body assembly according to claim 2, characterized in that, The difference between the height of the annular protrusion (3) and the depth of the annular groove (4) is greater than or equal to 1 mm.

4. The valve body assembly according to claim 2, characterized in that, The annular groove (4) has a first groove sidewall (401) and a second groove sidewall (402) that are radially opposite to the annular protrusion (3). The inner circumferential surface of the annular protrusion (3) is disposed close to the first groove sidewall (401) relative to the outer circumferential surface of the annular protrusion (3). The inner circumferential surface of the annular protrusion (3) is spaced apart from the first groove sidewall (401), and the outer circumferential surface of the annular protrusion (3) is spaced apart from the second groove sidewall (402).

5. The valve body assembly according to claim 4, characterized in that, The distance between the inner circumferential surface of the annular protrusion (3) and the first groove sidewall (401) is the same as the distance between the outer circumferential surface of the annular protrusion (3) and the second groove sidewall (402).

6. The valve body assembly according to claim 4, characterized in that, The distance between the inner circumferential surface of the annular protrusion (3) and the first groove sidewall (401) is greater than or equal to 1 mm; and / or the distance between the outer circumferential surface of the annular protrusion (3) and the second groove sidewall (402) is greater than or equal to 1 mm.

7. The valve body assembly according to claim 1, characterized in that, The thickness of the annular protrusion (3) is greater than or equal to 3 mm.

8. The valve body assembly according to claim 1, characterized in that, The cross-section of the annular protrusion (3) is rectangular or trapezoidal.

9. The valve body assembly according to claim 1, characterized in that, The number of annular protrusions is multiple, and the multiple annular protrusions (3) are arranged at radial intervals. The number of annular grooves (4) is multiple, and the multiple annular protrusions (3) and the multiple annular grooves (4) are matched one-to-one.

10. A safety valve, characterized in that, It includes a guide sleeve (200) and a valve body assembly as described in any one of claims 1-9, wherein the guide sleeve (200) is directionally connected to the valve core (1).

Images