A flap check valve

Abstract

The utility model relates to the production field of check valve more specifically, relate to a kind of flap check valve, including upper valve body, lower valve body, with the petal valve of lower valve body rotation connection and the connecting piece for connecting upper valve body and lower valve body, annular protruding portion is arranged inside lower valve body, the top of annular protruding portion is equipped with the first annular groove, first sealing ring is installed in the first annular groove, when petal valve is in closed state, the side of petal valve and first sealing ring are abutted.The first sealing ring is arranged in the first annular groove in the top of annular protruding portion, the side between petal valve and first sealing ring is line contact, and because the processing surface of petal valve is relatively smooth, and sealing ring is formed by rubber mould pressing, overall roundness, flatness is more easily controlled, therefore, the contact place of petal valve and annular protruding portion will not appear gap, sealing is better, reduce leakage, avoid the problem that lower valve body is easily contracted and deformed.

Description

Technical Field

[0001] This utility model relates to the field of check valve manufacturing, and more specifically, to a flap check valve. Background Technology

[0002] A check valve, also known as a one-way valve or non-return valve, is an automatic valve mainly used to control the unidirectional flow of fluids (liquid or gas) and prevent backflow, thereby ensuring the safety and stability of pipeline systems. It is widely used in water conservancy, chemical industry, energy, construction and other fields.

[0003] A flap check valve, also known as a swing check valve, controls the flow of media by opening and closing a flap valve. When the media flows in the forward direction, the flap valve is pushed open, allowing flow; when the flow direction is reversed, the flap valve closes due to its own weight or reverse pressure, preventing backflow.

[0004] Currently, traditional flap check valves on the market often have a sealing gasket on the flap valve. The flow channel is sealed by the contact between the sealing gasket and the annular protrusion inside the lower valve body. For example, the prior art discloses a flap check valve, which consists of a flap valve, an upper connecting pipe, an upper nut, an upper sealing ring, a lower connecting pipe, a lower nut, and a lower sealing ring. A rubber support ring is installed on one side of the flap valve. The seal is achieved by the rubber support ring abutting against the top of the annular protrusion. However, the top of the annular protrusion and the rubber support ring are in surface contact. Moreover, the lower valve body is produced by injection molding. Due to the shrinkage and deformation of the material during processing, the top surface of the annular protrusion becomes uneven. Gaps are prone to appear at the connection between the annular protrusion and the rubber sealing ring, resulting in poor sealing performance of the check valve. Utility Model Content

[0005] The purpose of this invention is to overcome the problem that the top surface of the annular protrusion of the existing flap check valve is prone to unevenness, resulting in poor sealing performance. This invention provides a flap check valve that improves the sealing performance of the check valve and reduces leakage.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A flap check valve is provided, comprising an upper valve body, a lower valve body, a flap valve rotatably connected to the lower valve body, and a connector for connecting the upper valve body and the lower valve body. The lower valve body has an annular protrusion inside, and a first annular groove is formed at the top of the annular protrusion. A first sealing ring is installed in the first annular groove. When the flap valve is in the closed state, one side of the flap valve abuts against the first sealing ring.

[0008] This utility model discloses a flap check valve with a first annular groove on the top of the annular protrusion. A first sealing ring is installed in the first annular groove. When the flap valve is closed, there is line contact between one side of the flap valve and the sealing ring. Since the machined surface of the flap valve is relatively flat and the sealing ring is formed by pressing rubber mold, the overall roundness and flatness are easier to control. Therefore, there will be no gap at the contact point between the flap valve and the annular protrusion, resulting in better sealing and reduced leakage. Compared with the prior art, the change from surface contact to line contact better avoids the problem that the lower valve body is prone to shrinkage and deformation, which leads to poor sealing.

[0009] Furthermore, the first sealing ring and the first sealing groove are connected by an adhesive. This adhesive connection ensures the stability of the connection between the first sealing ring and the first sealing groove, preventing the first sealing ring from being dislodged.

[0010] Furthermore, the annular protrusion is an internally hollow oblique cylinder, with the end of the annular protrusion near the rotation axis of the valve being lower than the end of the annular protrusion away from the rotation axis of the valve. Since the check valve is sometimes installed horizontally, in the installed state, the retainer is located above the annular protrusion. Because the end of the annular protrusion near the retainer is lower than the end of the annular protrusion away from the retainer, the valve is subjected to gravity. When the valve rotates to abut against the upper end of the annular protrusion, the component of gravity causes the valve to press tightly against the upper end of the annular protrusion, resulting in better sealing.

[0011] Furthermore, the angle between the line connecting the highest point and the lowest point of the top surface of the annular protrusion and the horizontal plane is between 10° and 20°. If this angle is too large, the check valve will fail to perform its check function; therefore, this angle should not be too large.

[0012] Furthermore, a limiting part is provided on the inner wall of the upper valve body or the inner wall of the lower valve body. The limiting part is used to limit the maximum rotation angle of the valve. The limiting part can limit the valve's rotation angle, preventing the valve from rotating too much and making it difficult for the valve to close automatically.

[0013] Furthermore, the valve is provided with a rotating shaft, and a retaining seat is provided in the lower valve body. The rotating shaft is rotatably connected to the retaining seat. The limiting part includes two parallel ribs, which are positioned above the rotating shaft. The ribs are located above the rotating shaft to prevent the rotating shaft from disengaging, thus improving stability. The ribs also provide good support, and the ribs are in line contact with one side of the valve, further enhancing stability.

[0014] Furthermore, when the top surface of the valve contacts the limiting part, the angle between the top surface of the valve and the horizontal plane is between 70° and 80°. This angle should be selected within a moderate range; if it is too large, it will make it difficult for the valve to close automatically; if it is too small, it will reduce the flow rate of the check valve.

[0015] Furthermore, the connector includes a nut, a first protrusion on the outer wall of the bottom end of the upper valve body, a first threaded portion on the outer wall of the lower valve body, a second threaded portion on the inner wall of the nut, and a second protrusion on the inner wall of the top end of the nut. The first threaded portion and the second threaded portion are threadedly connected, and the top end of the first protrusion abuts against the bottom end of the second protrusion. When assembling the check valve, align the bottom end of the upper valve body with the top end of the lower valve body, then insert the nut from the top end of the upper valve body until the second threaded portion on the nut reaches the first threaded portion. Then, rotate the nut to engage the first and second threaded portions until the second protrusion presses against the first protrusion. The top surface of the lower valve body and the bottom surface of the second protrusion together clamp the upper valve body, thus achieving the installation between the upper and lower valve bodies. This installation method eliminates the need for multiple bolts and nuts, simplifying the assembly process, saving time and effort, and reducing material costs.

[0016] Furthermore, both the first and second protrusions are annular, with the inner side of the second protrusion abutting against the outer wall of the upper valve body. The annularity of both protrusions increases the contact area between the upper and lower valve bodies, resulting in better fixation. The inner side of the second protrusion restricts the radial movement of the upper valve body, further enhancing the radial stability of the upper and lower valve bodies.

[0017] Furthermore, a second annular groove is formed on the bottom surface of the upper valve body, and a second sealing ring is installed in the second annular groove. The second sealing ring enhances the sealing performance between the upper valve body and the lower valve body.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. The first sealing ring is set in the first annular groove at the top of the annular protrusion. One side of the valve is in line contact with the first sealing ring. Since the valve's machining surface is relatively flat and the sealing ring is formed by pressing with a rubber mold, the overall roundness and flatness are easier to control. Therefore, there will be no gap at the contact point between the valve and the annular protrusion, resulting in better sealing, reduced leakage, and avoiding the problem of easy shrinkage and deformation of the lower valve body.

[0020] 2. The setting of the limit part can limit the valve and prevent the valve from rotating too much, which would make it difficult for the valve to close automatically.

[0021] 3. The use of nut connection eliminates the need for multiple bolts and nuts for installation, making the assembly process simpler, saving time and effort, and reducing material costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a flap check valve;

[0023] Figure 2 for Figure 1 A magnified view of a portion of position A;

[0024] Figure 3 for Figure 1 A magnified view of position B;

[0025] Figure 4 This is a schematic diagram of the upper valve body;

[0026] Figure 5 This is a schematic diagram of the lower valve body.

[0027] Figure 6 This is a schematic diagram of the nut structure;

[0028] Figure 7 This is a schematic diagram of the valve disc structure.

[0029] In the attached diagram: 100, upper valve body; 110, first protrusion; 120, limiting part; 121, rib; 130, second annular groove; 140, second sealing ring; 200, lower valve body; 210, first threaded part; 220, annular protrusion; 230, first annular groove; 240, first sealing ring; 250, retainer; 300, valve disc; 310, rotating shaft; 400, nut; 410, second protrusion; 420, second threaded part. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] Example 1

[0033] This embodiment is a first embodiment of a flap check valve, such as... Figure 1 As shown, the system includes an upper valve body 100, a lower valve body 200, a flap valve 300 rotatably connected to the lower valve body 200, and a connecting piece for connecting the upper valve body 100 and the lower valve body 200. The upper valve body 100 and the lower valve body 200 are both hollow and interconnected to form a flow channel. The flap valve 300 is used to block the flow channel. Figure 5 As shown, an annular protrusion 220 is provided inside the lower valve body 200. In this embodiment, the annular protrusion 220 is a hollow oblique cylinder. The flow channel passes through the inner cavity of the annular protrusion 220. The end of the annular protrusion 220 near the rotation axis of the valve disc 300 is lower than the end of the annular protrusion 220 away from the axis of the valve disc 300. The angle between the line connecting the highest point and the lowest point of the top surface of the annular protrusion 220 and the horizontal plane is 15°. Figure 3 As shown, the top of the annular protrusion 220 is provided with a first annular groove 230, and an O-ring 240 is connected in the first annular groove 230 by an adhesive. When the valve 300 is in the closed state, one side of the valve 300 abuts against the first sealing ring 240.

[0034] The working principle of this embodiment is as follows:

[0035] A first annular groove 230 is formed on the top of the annular protrusion 220. A first sealing ring 240 is installed within the first annular groove 230. When the valve 300 is closed, one side of the valve 300 is in line contact with the sealing ring. Because the machined surface of the valve 300 is relatively flat, and the sealing ring is molded from a rubber mold, its overall roundness and flatness are easier to control. Therefore, no gaps appear at the contact point between the valve 300 and the annular protrusion 220, resulting in better sealing and reduced leakage. Compared to existing technologies, this change from surface contact to line contact better avoids the risk of leakage. The valve body 200 is prone to shrinkage and deformation, leading to poor sealing. However, in actual installation, the check valve is sometimes set horizontally. In the installed state, the end of the annular protrusion 220 near the rotation axis of the valve 300 is lower than the end of the annular protrusion 220 away from the rotation axis of the valve 300. The valve 300 is subjected to gravity. When the valve 300 rotates to abut the upper end of the annular protrusion 220, the component of gravity will make the valve 300 fit tightly against the upper end of the annular protrusion 220, resulting in better sealing.

[0036] Example 2

[0037] This embodiment is a second embodiment of a flap check valve. This embodiment is similar to the first embodiment, except that, as shown in the example... Figure 5 and Figure 7 As shown, the valve 300 is provided with a rotating shaft 310, and a retainer 250 is provided inside the lower valve body 200. The rotating shaft 310 is rotatably connected to the retainer 250, as shown. Figure 1 and Figure 4 As shown, the limiting part 120 includes two parallel ribs 121. The ribs 121 are located above the rotating shaft part 310. The ribs 121 are in line contact with one side of the valve 300. When the top surface of the valve 300 contacts the limiting part 120, the angle between the top surface of the valve 300 and the horizontal plane is 80°.

[0038] The working principle of this embodiment is as follows:

[0039] The limiting part 120 can limit the movement of the valve 300, preventing the valve 300 from rotating too much and making it difficult for the valve 300 to close automatically. The rib 121 has good support performance. The rib 121 is located above the rotating shaft 310 and is used to limit and prevent the rotating shaft 310 from disengaging, resulting in better stability. The rib 121 is in line contact with one side of the valve 300, which also improves stability. The angle should be selected within a moderate range. If it is too large, it will make it difficult for the valve 300 to close automatically. If it is too small, it will reduce the flow of the check valve.

[0040] The remaining working principles of this embodiment are the same as those of Embodiment 2.

[0041] In addition, the limiting part 120 can also be provided inside the lower valve body 200, and the rotation angle of the valve 300 is limited by the contact between the limiting part 120 and the bottom surface of the valve 300.

[0042] Example 3

[0043] A flap check valve, such as Figure 5 and Figure 6 As shown, the outer wall of the lower valve body 200 is provided with a first threaded portion 210, the inner wall of the nut 400 is provided with a second threaded portion 420, and the inner wall of the top of the nut 400 is provided with an annular second protrusion 410. The first threaded portion 210 and the second threaded portion 420 are threadedly connected, as shown. Figure 1 and Figure 2 As shown, when the check valve is installed, the top end of the first protrusion 110 abuts against the bottom end of the second protrusion 410, the inner side of the second protrusion 410 abuts against the outer wall of the upper valve body 100, and the bottom surface of the upper valve body 100 is provided with a second annular groove 130, and an O-ring 140 is installed in the second annular groove 130.

[0044] The working principle of this embodiment is as follows:

[0045] This utility model discloses a flap check valve. During the assembly of the check valve, the bottom end of the upper valve body 100 and the top end of the lower valve body 200 are aligned. Then, the nut 400 is inserted from the top end of the upper valve body 100 until the second threaded portion 420 on the nut 400 reaches the first threaded portion 210. Then, the nut 400 can be rotated to make the first threaded portion 210 and the second threaded portion 420 threaded together until the second protrusion 410 presses the first protrusion 110 tightly. The top surface of the lower valve body 200 and the bottom surface of the second protrusion 410 together clamp the upper valve body 100, thereby realizing the installation between the upper valve body 100 and the lower valve body 200.

[0046] The beneficial effects of this embodiment are as follows:

[0047] The upper valve body 100 and the lower valve body 200 are installed using nuts, eliminating the need for multiple bolts and nuts. This simplifies the assembly process, saves time and effort, and reduces material costs. Both the first protrusion 110 and the second protrusion 410 are annular, resulting in a larger contact area and better fixation between the upper valve body 100 and the lower valve body 200. The inner side of the second protrusion 410 restricts the radial movement of the upper valve body 100, improving the radial stability of the upper valve body 100 and the lower valve body 200. The second sealing ring 140 enhances the sealing between the upper valve body 100 and the lower valve body 200.

[0048] In addition, the second annular groove 130 can also be formed on the top of the lower valve body 200. The second sealing ring 140 is installed in the second annular groove 130, which, like the one installed in the upper valve body 100, can improve the sealing performance.

[0049] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make various variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A flap check valve comprising an upper valve body (100), a lower valve body (200), a flap valve (300) rotatably connected with the lower valve body (200), and a connecting member for connecting the upper valve body (100) and the lower valve body (200), wherein the lower valve body (200) is internally provided with an annular protrusion (220), characterized in that, The top end of the annular protrusion (220) is provided with a first annular groove (230), and a first sealing ring (240) is installed in the first annular groove (230). When the valve (300) is in the closed state, one side of the valve (300) abuts against the first sealing ring (240).

2. The flap check valve according to claim 1, characterized in that, The first sealing ring (240) and the first sealing groove (230) are connected by an adhesive.

3. A flap check valve according to claim 1, characterized in that, The annular protrusion (220) is a hollow oblique cylinder. The end of the annular protrusion (220) near the rotation axis of the valve (300) is lower than the end of the annular protrusion (220) away from the rotation axis of the valve (300).

4. A flap check valve according to claim 3, characterized in that, The angle between the line connecting the highest point of the top surface of the annular protrusion (220) and the lowest point of the top surface of the annular protrusion (220) and the horizontal plane is between 10° and 20°.

5. A flap check valve according to claim 1, characterized in that, The inner wall of the upper valve body (100) is provided with a limiting part (120), which is used to limit the maximum rotation angle of the valve (300).

6. A flap check valve according to claim 5, characterized in that, The valve is provided with a rotating shaft (310), and a retainer (250) is provided inside the lower valve body (200). The rotating shaft (310) is rotatably connected to the retainer (250). The limiting part (120) includes two parallel ribs (121), which are located above the rotating shaft (310).

7. A flap check valve according to claim 6, characterized in that, When the top surface of the valve (300) contacts the limiting part (120), the angle between the top surface of the valve (300) and the horizontal plane is 70°-80°.

8. A flap check valve according to any one of claims 1-7, characterized in that, The connector includes a nut (400), the outer wall of the bottom end of the upper valve body (100) is provided with a first protrusion (110), the outer wall of the lower valve body (200) is provided with a first threaded portion (210), the inner wall of the nut (400) is provided with a second threaded portion (420), the inner wall of the top end of the nut (400) is provided with a second protrusion (410), the first threaded portion (210) and the second threaded portion (420) are threadedly connected, and the top end of the first protrusion (110) abuts against the bottom end of the second protrusion (410).

9. A flap check valve according to claim 8, characterized in that, Both the first protrusion (110) and the second protrusion (410) are annular, and the inner side of the second protrusion (410) abuts against the outer wall of the upper valve body (100).

10. A flap check valve according to any one of claims 1-7, characterized in that, The bottom surface of the upper valve body (100) is provided with a second annular groove (130), and a second sealing ring (140) is installed in the second annular groove (130).

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