Lifting check valve for nuclear power plant

Abstract

The utility model discloses a nuclear power plant lift type check valve which comprises a valve body and a valve cover, an inlet channel and an outlet channel are arranged in the valve body, a valve seat is arranged in the valve body, and a flow guide channel is arranged in the valve seat. A valve clack assembly matched with the valve seat is arranged in the valve body, the valve clack assembly comprises a valve clack body, a sealing ring, a pressing plate and a fastening nut, the valve clack is provided with a containing groove, and a sealing ring groove is formed in the containing groove; an installation column is arranged on the surface, facing the valve seat, of the containing groove, at least part of the circumferential outer side face of the installation column is provided with external threads, the sealing ring is installed in the containing groove, the annular pressing plate is arranged on the installation column in a sleeving mode, and the circumferential outer side face of the pressing plate and the circumferential inner side face of the sealing ring groove jointly extrude and fix the sealing ring. The fastening nut is installed on the installation column and abuts against the lower surface of the pressing plate. The valve clack assembly is convenient and fast to assemble, the installation stability of the sealing ring can be effectively improved, it is ensured that the sealing ring is not prone to being separated from the valve clack body, and the sealing performance of the nuclear power plant lifting type check valve can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a lifting check valve for a nuclear power plant. Background Art

[0002] Conventional check valves, commonly used in nuclear power plant systems, prevent backflow of media. To achieve this function, conventional check valves press the disc against the seat through the pressure of the media, creating a seal. The tightness of a check valve is directly proportional to the pressure.

[0003] This check valve often uses a soft-sealing disc. A common structure for this type of disc is a dovetail groove and an O-ring, forming a sealing pair with the valve seat. The O-ring in this dovetail groove requires manual pressure into the groove, making installation difficult and technically difficult to ensure the flatness of the O-ring. The unevenness of the O-ring affects the sealing performance of the check valve, particularly under low pressure differentials. Furthermore, the O-ring in this type of disc is prone to dislodging after manual installation, creating a risk of it falling out of the dovetail groove during equipment operation, potentially leading to internal leakage. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a lifting check valve for a nuclear power plant.

[0005] The technical solution adopted by the utility model to solve the technical problem is as follows: constructing a nuclear power plant lift check valve, comprising a valve body and a valve cover, wherein the valve body and the valve cover are connected by fasteners, an inlet channel and an outlet channel are provided in the valve body, a valve seat is provided on a side of the valve body close to the inlet channel, and a guide channel is provided in the valve seat that is interconnected with the inlet channel;

[0006] The valve body is provided with a valve flap assembly that cooperates with the valve seat. The valve flap assembly includes a valve flap body, a sealing ring, a pressure plate and a fastening nut. The valve flap body is provided with a receiving groove on the side facing the valve seat, and a sealing ring groove is formed on the side of the receiving groove close to the valve seat.

[0007] A mounting post is provided on the surface of the accommodating groove facing the valve seat, and at least a portion of the circumferential outer side surface of the mounting post is provided with an external thread. The sealing ring is installed in the accommodating groove, and the pressure plate is annular. The pressure plate is sleeved on the mounting post, and the circumferential outer side surface of the pressure plate and the circumferential inner side surface of the sealing ring groove jointly squeeze and fix the sealing ring. The fastening nut is installed on the mounting post and pressed against the lower surface of the pressure plate.

[0008] In some embodiments, the valve flap assembly further includes at least one gasket, which is sleeved on the mounting post and located between the fastening nut and the pressure plate.

[0009] In some embodiments, the gasket is a corrugated gasket, a flat gasket, or a butterfly gasket.

[0010] In some embodiments, the sealing ring includes at least one of a nitrile rubber sealing ring, an EPDM rubber sealing ring, a fluororubber sealing ring, a polytetrafluoroethylene sealing ring or a silicone rubber sealing ring.

[0011] In some embodiments, the inner diameter of the sealing ring groove gradually decreases from a side away from the valve seat to a side close to the valve seat.

[0012] In some embodiments, the pressure plate includes a first columnar portion and a second columnar portion axially connected to each other, the circumferential outer side surface of the second columnar portion is arranged opposite to the circumferential inner side surface of the sealing ring groove, and the outer diameter of the second columnar portion gradually increases from the side close to the first columnar portion to the side away from the first columnar portion.

[0013] In some embodiments, the valve seat is provided with a sealing portion, and the upper surface of the sealing portion is arranged opposite to the sealing ring.

[0014] In some embodiments, the sealing portion is a metal member.

[0015] In some embodiments, a guide groove is provided in the valve body, the guide groove is communicated with the guide channel, and the valve flap assembly is installed in the guide groove.

[0016] In some embodiments, the circumferential outer side surface of the valve flap body is at least partially provided with a wear-resistant layer.

[0017] The implementation of the utility model has the following beneficial effects: the valve disc assembly of the nuclear power plant lift check valve is convenient and quick to assemble, and can effectively improve the installation stability of the sealing ring, ensuring that the sealing ring is not easily separated from the valve disc body, and can effectively improve the sealing performance of the nuclear power plant lift check valve, avoiding the occurrence of internal leakage of the nuclear power plant lift check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0019] Figure 1 It is a structural schematic diagram of a nuclear power plant lift check valve in some embodiments of the present utility model;

[0020] Figure 2It is a partial structural diagram of a nuclear power plant lift check valve in some embodiments of the present utility model;

[0021] Figure 3 It is a structural schematic diagram of a nuclear power plant lift check valve test system in some embodiments of the present utility model. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the present technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0023] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, and they can be internal connections between two elements or interactions between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", and "third" are only used to facilitate the description of the present technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", and "third" can explicitly or implicitly include one or more of these features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present invention with unnecessary detail.

[0025] See Figures 1 to 3The utility model shows a lifting check valve for a nuclear power plant, comprising a valve body 10 and a valve cover 20, wherein the valve body 10 and the valve cover 20 are connected by a fastener 30, and the fastener 30 includes but is not limited to a bolt or a bolt-nut combination.

[0026] An inlet channel A and an outlet channel B are provided in the valve body 10 . A valve seat 11 is provided on one side of the valve body 10 close to the inlet channel A. A guide channel C communicating with the inlet channel A is provided in the valve seat 11 .

[0027] A valve flap assembly 40 that cooperates with the valve seat 11 is provided in the valve body 10. The valve flap assembly 40 includes a valve flap body 41, a sealing ring 42, a pressure plate 43 and a fastening nut 44. The valve flap body 41 is provided with a receiving groove 411 on the side facing the valve seat 11, and a sealing ring groove 412 is formed on the side of the receiving groove 411 close to the valve seat 11.

[0028] The surface of the accommodating groove 411 facing the valve seat 11 is provided with a mounting post 413, and the circumferential outer side surface of the mounting post 413 is at least partially provided with an external thread. The sealing ring 42 is installed in the accommodating groove 411, and the pressure plate 43 is annular. The pressure plate 43 is sleeved on the mounting post 413, and the circumferential outer side surface of the pressure plate 43 and the circumferential inner side surface of the sealing ring groove 412 jointly squeeze and fix the sealing ring 42. The fastening nut 44 is installed on the mounting post 413 and pressed against the lower surface of the pressure plate 43 to fix the pressure plate 43, and then fix the sealing ring 42 through the pressure plate 43.

[0029] In some embodiments, the inner diameter of the sealing ring groove 412 gradually decreases from the side away from the valve seat 11 to the side close to the valve seat 11. The pressure plate 43 includes a first columnar portion 431 and a second columnar portion 432 connected axially. The circumferential outer side surface of the second columnar portion 432 is arranged opposite to the circumferential inner side surface of the sealing ring groove 412, and the outer diameter of the second columnar portion 432 gradually increases from the side close to the first columnar portion 431 to the side away from the first columnar portion 431. Figure 2 As shown, the circumferential outer side surface of the second columnar portion 432 and the circumferential inner side surface of the sealing ring groove 412 form a dovetail groove structure, which can better restrain the sealing ring 42. The sealing ring 42 includes at least one of a nitrile rubber sealing ring, an EPDM rubber sealing ring, a fluororubber sealing ring, a polytetrafluoroethylene sealing ring, or a silicone rubber sealing ring. The sealing ring 42 can be selected and configured according to actual needs and is not specifically limited here.

[0030] In some embodiments, the valve flap assembly 40 further includes at least one gasket 45 , which is sleeved on the mounting column 413 and located between the fastening nut 44 and the pressure plate 43 . The provision of the gasket 45 can improve the installation stability of the fastening nut 44 and the pressure plate 43 .

[0031] Preferably, the gasket 45 is a corrugated gasket, a flat gasket or a butterfly gasket. Of course, the gasket 45 can be a locking gasket.

[0032] like Figure 1 As shown, in some embodiments, the valve seat 11 is provided with a sealing portion 111. The upper surface of the sealing portion 111 is disposed opposite the sealing ring 42. The sealing portion 111 is a boss structure disposed opposite the sealing ring 42. When the valve flap assembly 40 descends to seal the diversion channel C, the sealing ring 42 abuts against the sealing portion 111. Preferably, the sealing portion 111 is a metal part, such as a copper alloy, chromium stainless steel, Stellite alloy, nickel-based alloy, or iron-based alloy. The sealing portion 111 may be a part of the valve seat 11, and its material may be the same as that of the valve seat 11. Of course, in other embodiments, the valve seat 11 may not be provided with the sealing portion 111, and the upper surface of the valve seat 11 may be a plane, that is, the sealing surface may be a plane.

[0033] In some embodiments, a guide groove D is provided in the valve body 10, which is connected to the guide channel C. The valve flap assembly 40 is installed in the guide groove D. The circumferential outer side surface of the valve flap body 41 is at least partially provided with a wear-resistant layer 46, which can be a hard alloy.

[0034] like Figure 3 As shown, the nuclear power plant lift check valve test system includes a gas source 100, a valve sealing test bench 200, a regulating valve 300, a pressure gauge 400, a nuclear power plant lift check valve (replaced by reference numeral 10), and a bubble counter 500, which are connected in sequence. The gas source 100 is used to provide experimental gas, the regulating valve 300 can be used to adjust the gas flow rate and flow rate, etc., and the pressure gauge 400 is used to detect the pressure. The experimental data table is shown in Table 1 below:

[0035] Table 1 Test data of lift check valves in nuclear power plants

[0036]

[0037] The above test data show that the sealing performance of the lift check valve in nuclear power plants is good, especially when the pressure difference between the upstream and downstream of the lift check valve in nuclear power plants is small.

[0038] It can be understood that the valve flap assembly 40 of the nuclear power plant's lift check valve is easy and quick to assemble, and can effectively improve the installation stability of the sealing ring 42, ensuring that the sealing ring 42 is not easily separated from the valve flap body 41, which can effectively improve the sealing performance of the nuclear power plant's lift check valve and avoid the occurrence of internal leakage of the nuclear power plant's lift check valve.

[0039] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A lift check valve for a nuclear power plant, characterized in that: The invention comprises a valve body (10) and a valve cover (20), wherein the valve body (10) and the valve cover (20) are connected via a fastener (30), an inlet channel (A) and an outlet channel (B) are provided in the valve body (10), a valve seat (11) is provided on a side of the valve body (10) close to the inlet channel (A), and a guide channel (C) is provided in the valve seat (11) and is in communication with the inlet channel (A); A valve flap assembly (40) is provided in the valve body (10) and cooperates with the valve seat (11). The valve flap assembly (40) includes a valve flap body (41), a sealing ring (42), a pressure plate (43) and a fastening nut (44). The valve flap body (41) is provided with a receiving groove (411) on the side facing the valve seat (11), and a sealing ring groove (412) is formed on the side of the receiving groove (411) close to the valve seat (11); The surface of the accommodating groove (411) facing the valve seat (11) is provided with a mounting post (413), and the circumferential outer side surface of the mounting post (413) is at least partially provided with an external thread. The sealing ring (42) is installed in the accommodating groove (411), and the pressure plate (43) is annular. The pressure plate (43) is sleeved on the mounting post (413), and the circumferential outer side surface of the pressure plate (43) and the circumferential inner side surface of the sealing ring groove (412) jointly squeeze and fix the sealing ring (42). The fastening nut (44) is installed on the mounting post (413) and pressed against the lower surface of the pressure plate (43).

2. The nuclear power plant lift check valve according to claim 1, characterized in that: The valve flap assembly (40) further includes at least one gasket (45), which is sleeved on the mounting column (413) and located between the fastening nut (44) and the pressure plate (43).

3. The nuclear power plant lift check valve according to claim 2, characterized in that: The gasket (45) is a corrugated gasket, a flat gasket or a butterfly gasket.

4. The nuclear power plant lift check valve according to claim 1, characterized in that: The sealing ring (42) comprises at least one of a nitrile rubber sealing ring, an EPDM rubber sealing ring, a fluororubber sealing ring, a polytetrafluoroethylene sealing ring or a silicone rubber sealing ring.

5. The nuclear power plant lift check valve according to claim 1, characterized in that: The inner diameter of the sealing ring groove (412) gradually decreases from a side away from the valve seat (11) to a side close to the valve seat (11).

6. The nuclear power plant lift check valve according to claim 5, characterized in that: The pressure plate (43) includes a first columnar portion (431) and a second columnar portion (432) connected axially, the circumferential outer side surface of the second columnar portion (432) is arranged opposite to the circumferential inner side surface of the sealing ring groove (412), and the outer diameter of the second columnar portion (432) gradually increases from the side close to the first columnar portion (431) to the side away from the first columnar portion (431).

7. The nuclear power plant lift check valve according to claim 5, characterized in that: The valve seat (11) is provided with a sealing portion (111), and the upper surface of the sealing portion (111) is arranged opposite to the sealing ring (42).

8. The nuclear power plant lift check valve according to claim 7, characterized in that: The sealing portion (111) is a metal part.

9. The nuclear power plant lift check valve according to claim 1, characterized in that: A guide groove (D) is provided in the valve body (10), the guide groove (D) is communicated with the guide channel (C), and the valve flap assembly (40) is installed in the guide groove (D).

10. The nuclear power plant lift check valve according to claim 1, characterized in that: The circumferential outer side surface of the valve flap body (41) is at least partially provided with a wear-resistant layer (46).

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