Plastic ball type check valve

Abstract

The utility model provides a plastic ball type check valve, which comprises a valve body, a valve core, a gasket, a sealing gasket, a socket joint and a locking nut, the socket joint is locked at one axial end of the valve body through a locking nut; the gasket and the sealing gasket are sequentially arranged at the connecting position of the valve body and the socket structure. A plurality of positioning ribs are arranged on the inner wall of the inner cavity around the central axis of the valve body, and the valve element is slidably limited in a space defined by the positioning ribs; a fitting groove matched with the surface of the valve element in shape is formed in the side, facing the inner cavity, of the gasket. According to the utility model, the contact area of the valve core and the gasket can be further increased, the sealing performance of the valve core and the gasket is fully improved, and meanwhile, the rotation of the gasket in the circumferential direction of the gasket is limited, so that the gasket is always kept stable, and the sealing performance of the valve core and the gasket is improved. The sealing structure can be suitable for various scenes with high sealing performance requirements such as chemical engineering and medical treatment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of check valve, in particular to a plastic round ball check valve. BACKGROUND

[0002] In the current market, the common check valve mostly achieves the sealing purpose by the round ball valve core. For such check valve, because the valve core is a spherical structure, in its working process, the entire surface of the valve core has the possibility of contacting the gasket, and the specific sealing effect is realized by the mutual extrusion of the spherical structure and the inner edge of the gasket.

[0003] Because the contact area between the sphere and the inner edge of the gasket is relatively small and difficult to ensure uniformity, the reliability of the seal is greatly discounted.

[0004] In addition, the gasket in contact with the valve core is only fixed by the pressing force on both sides, and its circumferential direction is still movable, so in actual operation, the gasket is difficult to continuously maintain a close-fitting state when contacting the valve core, and gaps are easily generated, ultimately leading to a significant reduction in sealing effect, and unable to meet the stringent requirements of high sealing performance scenes such as chemical industry, medical treatment, etc.

[0005] Therefore, the present inventors specially designed a plastic round ball check valve, and the present case was generated. CONTENT OF THE UTILITY MODEL

[0006] In order to solve the above problems, the technical scheme of the utility model is as follows:

[0007] A plastic round ball check valve, comprising a valve body, a valve core, a gasket, a sealing gasket, a socket joint and a locking nut, wherein:

[0008] The inner side of the valve body is formed with an inner cavity along the axial direction thereof;

[0009] The socket joint is locked to the axial end of the valve body by the locking nut;

[0010] The gasket and the sealing gasket are sequentially arranged at the connection position of the valve body and the socket structure;

[0011] The inner wall of the inner cavity is provided with a plurality of positioning ribs around the center axis of the valve body, and the valve core is slidingly limited in the space formed between the positioning ribs;

[0012] The side of the gasket facing the inner cavity is provided with a matching groove adapted to the surface shape of the valve core;

[0013] The side of the gasket facing the inner cavity is provided with a plurality of positioning grooves around its circumferential direction, which are embedded in and one-to-one corresponding to the positioning ribs.

[0014] Preferably, the positioning ribs are in the form of a sheet and extend axially along the valve body, and the positioning ribs protrude towards the central axis of the valve body to form a stop edge for stopping the valve core.

[0015] Preferably, the positioning ribs are evenly provided with at least three around the central axis of the valve body.

[0016] Preferably, the positioning ribs are evenly provided with six around the central axis of the valve body.

[0017] Preferably, the positioning ribs are evenly provided with six around the central axis of the valve body.

[0018] Preferably, the gasket is annular and has a through-flow hole formed in the middle.

[0019] Preferably, the valve core is spherical, and the fitting groove is an arc-shaped wall surface that is recessed inward along the side wall of the flow guide hole and is fitted with the upper part of the valve core.

[0020] Preferably, the gasket is recessed inward on the side away from the fitting groove to form a positioning ring groove that is distributed around the side of the flow guide hole, and the sealing gasket protrudes along the axial direction to form a positioning part that is fitted with the positioning ring groove.

[0021] Preferably, the sealing gasket is provided with a first sealing groove that is distributed around the opening on the inner side of the positioning part, the gasket is recessed inward on the side close to the gasket to form a second sealing groove around the outer periphery, the gasket is provided with a third sealing groove that is distributed around the opening on the side away from the gasket, and the first, second and third sealing grooves are provided with sealing rings.

[0022] Preferably, the valve body is provided with a socket joint on the top and bottom along the axial direction, and is locked and fixed to the end of the valve body by a locking nut.

[0023] The beneficial effects of the utility model are as follows:

[0024] The utility model discloses a fitting groove that is compatible with the surface shape of the valve core is formed on the gasket, which can further increase the contact area of the valve core and the gasket and fully improve the sealing performance. Meanwhile, the positioning ribs limit the movement space of the valve core, and the positioning grooves that are fitted with the positioning ribs are arranged on the gasket, thereby limiting the rotation of the gasket in the circumferential direction and keeping it stable at all times, which can be applied to various high sealing performance required scenes such as chemical industry and medical treatment.

[0025] In addition, by additionally designing the first sealing groove, the second sealing groove and the third sealing groove on the sealing gasket, the inner and outer sides of the sealing gasket in contact with the gasket and the end side in contact with the socket joint can be further sealed and compressed, and the sealing performance is fully improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application.

[0027] Wherein:

[0028] Figure 1 is a perspective structural schematic view of the present application embodiment one;

[0029] Figure 2 is a side view of the present application embodiment one;

[0030] Figure 3 is a sectional structural schematic view of the present application embodiment one;

[0031] Figure 4 is a local sectional view and an exploded structural schematic view of the present application embodiment one;

[0032] Figure 5 is a top view of the valve body in the present application embodiment one;

[0033] Figure 6 is a perspective view of the gasket in the present application embodiment one;

[0034] Figure 7 is a local sectional view and an exploded structural schematic view of the socket joint and the locking nut in the present application embodiment one;

[0035] Figure 8 is a local sectional view and an exploded structural schematic view of the gasket and the sealing gasket in the present application embodiment one;

[0036] Figure 9 is a perspective structural schematic view of the present application embodiment two;

[0037] Figure 10 is a local sectional view and an exploded structural schematic view of the present application embodiment two;

[0038] Figure 11 is a local sectional view and an exploded structural schematic view of the present application embodiment two;

[0039] Figure 12 is a sectional structural schematic view of the present application embodiment three;

[0040] Figure 13 is a sectional structure schematic view of the valve core in the third embodiment of the present application.

[0041] Label explanation:

[0042] 100, valve body; 110, inner cavity; 120, connecting end; 121, connecting section; 122, liquid outlet; 123, annular step part; 130, first external thread; 140, positioning rib; 141, blocking edge; 142, arc-shaped guide corner; 150, mounting space; 160, second external thread; 170, fourth sealing groove; 180, fourth sealing ring; 200, valve core; 210, core body; 220, pointed part; 230, deformation groove; 300, gasket; 310, flow guide hole; 320, fitting groove; 330, positioning groove; 340, positioning ring groove; 400, sealing gasket; 410, connecting hole; 420, positioning part; 430, first sealing groove; 440, second sealing groove; 450, third sealing groove; 460, first sealing ring; 470, second sealing ring; 480, third sealing ring; 500, socket joint; 510, clamping edge; 520, liquid inlet channel; 600, locking nut; 610, first internal thread; 620, perforation; 630, clamping groove. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear and explicit, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. Embodiment one

[0044] Please refer to Figures 1 to 8 , a plastic round ball check valve as the best embodiment of the present application, comprising a valve body 100, a valve core 200, a gasket 300, a sealing gasket 400, a socket joint 500 and a locking nut 600, wherein:

[0045] As Figure 2 , 3 , 4 shows that the valve body 100 is in the shape of a circular tube as a whole, and a cylindrical inner cavity 110 is formed through the inner side of the valve body 100 in the axial direction, the bottom of the valve body 100 is inwardly recessed to form a connecting end 120 for sleeving a corresponding output pipeline, the connecting end 120 and the valve body 100 form an inclined connecting section 121, the inner cavity 110 is correspondingly inwardly recessed at the position of the connecting section 121 to form a liquid outlet 122 communicated with the connecting end 120, and the annular step part 123 protruding towards the center position is arranged at the position of the liquid outlet 122.

[0046] As Figure 3 , 4As shown in Figure 7, the socket joint 500 is locked to one axial end of the valve body 100 by a locking nut 600. The top of the outer periphery of the valve body 100 is provided with a first external thread 130, and the inner side of the locking nut 600 is provided with a first internal thread 610 that mates with the first external thread 130. A ring-shaped retaining rim 510 protrudes from the bottom of the outer periphery of the socket joint 500. A through hole 620 is formed on the inner side of the locking nut 600 to fit into the outer wall of the socket joint 500. A groove 630 is formed at the inner bottom of the through hole 620 to mate with the retaining rim 510. The inner side of the head 500 forms a through-flow liquid inlet channel 520 along its axial direction to achieve communication with the inner cavity 110. By inserting the socket connector 500 from bottom to top into the through hole 620 of the locking nut 600, and making the retaining edge 510 embedded in the retaining groove 630, and then aligning the lower opening of the locking nut 600 with the upper side of the valve body 100, the thread is tightened to the upper end of the valve body 100, thereby achieving the connection between the socket connector 500 and the upper end of the valve body 100. The diameter of the upper opening of the inner cavity 110 should be smaller than the outer diameter of the retaining edge 510.

[0047] like Figure 3 , 4 As shown, both the gasket 300 and the sealing gasket 400 are annular and are sequentially located at the connection between the valve body 100 and the socket structure.

[0048] like Figure 3 , 4 As shown, the inner wall of the inner cavity 110 is provided with a number of positioning ribs 140 surrounding the central axis of the valve body 100, and the valve core 200 is limited to sliding within the space formed by the number of positioning ribs 140.

[0049] In this embodiment, the valve core 200 is spherical and is a solid plastic ball. The positioning ribs 140 are sheet-like and extend along the axial direction of the valve body 100. The side of the positioning ribs 140 away from the socket joint 500 protrudes towards the central axis of the valve body 100 to form a sheet-like retaining edge 141 for stopping the valve core 200. The retaining edge 141 and the positioning ribs 140 are integrally sheet-like and distributed along the radial direction of the valve body 100. When the valve core 200 moves to the bottom of the inner cavity 110, it is stopped by the plane formed by the upper end surfaces of several retaining edges 141. At this time, the fluid enters the gap between adjacent positioning ribs 140 along the periphery of the valve core 200 and continues to flow along the gap to the gap between the lower retaining edges 141, and finally enters the connection end 120 through the outlet 122 to achieve output.

[0050] Specifically, the bottom of the positioning rib 140 extends to the upper end face of the annular step portion 123, and the stop 141 is also provided at the bottom of the positioning rib 140 and its extension distance does not exceed the inner edge of the limiting stop 141.

[0051] Combination Figure 5The six positioning ribs 140 are evenly arranged around the central axis of the valve body 100, so that a sliding space extending upward and downward is formed between the six positioning ribs 140, the side wall of the valve core 200 and the inner side wall of the six positioning ribs 140, and the valve core 200 is capable of moving upward and downward in the sliding space. The upper end surface of the positioning rib 140 and the upper end opening of the inner cavity 110 have a gap, and the gap forms an installation space 150 for sequentially stacking the gasket 300 and the sealing gasket 400. When the gasket 300 and the sealing gasket 400 are sequentially stacked in the installation space 150, the upper end surface of the sealing gasket 400 is flush with the upper end opening of the inner cavity 110, so that the lower end of the socket joint 500 can be in contact with the sealing gasket 400 when the locking nut 600 is locked on the upper end of the valve body 100, and a preliminary seal is formed by the contact and extrusion.

[0052] In addition, the number of the positioning ribs 140 can also be modified according to actual needs, and at least three positioning ribs 140 are evenly distributed around the central axis of the valve body 100, and the valve core 200 is stably positioned.

[0053] In addition, the corner position of the positioning rib 140 and the blocking edge 141 is provided with an arc-shaped guide corner 142, which further reduces the friction when the valve core 200 contacts the corner.

[0054] As Figure 4 , 6 The gasket 300 is annular and has a through flow guide hole 310 in the middle, the maximum outer diameter of the gasket 300 and the sealing gasket 400 is adapted to the diameter of the inner cavity 110 to achieve a gap fit, the side of the gasket 300 facing the inner cavity 110 is provided with a matching groove 320 adapted to the surface shape of the valve core 200, and the side of the gasket 300 facing the inner cavity 110 is provided with a plurality of positioning grooves 330 corresponding to the positioning ribs 140 around the circumference.

[0055] Specifically, in the embodiment, the valve core 200 is spherical, the matching groove 320 is an arc-shaped wall surface (not marked in the figure) recessed inward along the side wall of the flow guide hole 310 and embedded with the upper part of the valve core 200, the side of the gasket 300 away from the matching groove 320 is recessed inward to form a positioning ring groove 340 around the side of the flow guide hole 310, and the sealing gasket 400 protrudes along the axial direction to form a positioning part 420 embedded with the positioning ring groove 340. In the embodiment, the positioning ring groove 340 is in communication with the flow guide hole 310, and the flow guide hole 310 is located at the center of the bottom surface of the positioning ring groove 340.

[0056] Therefore, the contact area between the spherical valve core 200 and the gasket 300 is increased through the fitting groove 320 formed by the arc-shaped wall, thus improving its sealing performance. The process is as follows: when liquid flows in reverse along the outlet 122 at the bottom of the valve body 100, it pushes the valve core 200 towards the gasket 300. Finally, the liquid pressure presses the valve core 200 into the guide hole 310 of the gasket 300, and maintains a tight fit between the valve core 200 and the fitting groove 320, thereby achieving the check valve function.

[0057] In addition, there are 6 positioning grooves 330, which are evenly distributed around the periphery of the washer 300 to form a structure that is one-to-one with the top of the positioning rib 140. In this embodiment, the positioning grooves 330 extend along the outer wall of the washer 300 to the fitting groove 320 on the inner side of the washer 300, so that when the washer 300 is inserted into the inner cavity 110, it can be more convenient to achieve the snap-fit ​​with the positioning rib 140.

[0058] like Figure 4 , 8 As shown, the sealing gasket 400 is annular, with a connecting hole 410 in its middle part that communicates with the guide hole 310. A first sealing groove 430 is provided on the inner side of the positioning part 420, which is distributed around its opening. A second sealing groove 440 is formed by the side of the sealing gasket 400 that is close to the gasket 300 and is recessed inward around its outer periphery. A third sealing groove 450 is provided on the side of the sealing gasket 400 that is away from the gasket 300 and is distributed around its opening. A sealing ring is provided in the first sealing groove 430, the second sealing groove 440 and the third sealing groove 450.

[0059] The first sealing groove 430 has a semi-circular arc-shaped bottom groove and a connecting groove. The outer side of the connecting groove is connected to the positioning part 420 and its inner side is connected to the connecting hole 410. The sealing gasket 300 in the first sealing groove 430 is the first sealing ring 460. The first sealing groove 430 partially covers the upper opening of the guide hole 310. Thus, when the spherical valve core 200 moves to the highest position, its top protrudes from the guide hole 310 and extends into the connecting hole 410 of the sealing gasket 400. The spherical surface of its top squeezes the first sealing ring 460, enhancing the sealing performance between the valve core 200 and the sealing gasket 400.

[0060] Furthermore, the second sealing groove 440 is a stepped groove with a stepped cross-section, and its outer wall is in communication with the external environment. The sealing gasket 300 inside the second sealing groove 440 is the second sealing ring 470. When the sealing gasket 400 is placed into the installation space 150, the second sealing ring 470 is squeezed by the side wall of the installation space 150, so that the position between the outer periphery of the sealing gasket 400, the top surface of the gasket 300 and the side wall of the installation space 150 is further sealed.

[0061] In addition, the third sealing groove 450 is arranged on the top surface of the sealing gasket 400 and concentrically surrounds the circumferential side of the connecting hole 410, and the sealing gasket 300 in the third sealing groove 450 is a third sealing ring 480. Through the third sealing ring 480, the bottom surface of the socket joint 500 and the top surface of the sealing gasket 400 can be sealed, so as to prevent liquid from leaking along the gap between the two.

[0062] Therefore, through the sealing gaskets 300 at the three positions, the connection between the valve body 100 and the socket joint 500 is further sealed and reinforced, and the sealing performance is sufficiently enhanced. Embodiment Two

[0063] Please refer to Figures 9 to 11 , which is a plastic ball check valve according to Embodiment Two of the present application, and is different from Embodiment One in that the socket joint 500 is arranged on the top and bottom of the valve body 100 along the axial direction and is locked and fixed to the end of the valve body 100 through the locking nut 600.

[0064] Specifically, the connecting end 120 at the lower end of the valve body 100 is removed to form a cylindrical shape with the same outer diameter from top to bottom, the second external thread 160 is arranged on the lower end of the outer sidewall of the valve body 100, and the first internal thread 610 on the inner side of the locking nut 600 at the lower end can be threadedly locked with the second external thread 160. Therefore, by inserting the socket joint 500 into the through hole 620 of the locking nut 600 from top to bottom, and then locking and fixing the locking nut 600 along the lower end of the valve body 100, the connection between the lower end of the valve body 100 and the socket joint 500 can be achieved.

[0065] As shown in Figure 11 , the lower end surface of the valve body 100 is concentrically provided with an annular fourth sealing groove 170 around the circumferential side of the outlet 122, and the fourth sealing groove 170 is provided with a fourth sealing ring 180, so that the fourth sealing ring 180 can seal the socket joint 500 and the lower end surface of the valve body 100, thereby preventing liquid from leaking along the gap between the two. Embodiment Three

[0066] Please refer to Figure 12 , 13 , which is a plastic ball check valve according to Embodiment Three of the present application, and is different from Embodiment One in that, in the present embodiment, the valve core 200 includes a cylindrical core body 210 and a pointed portion 220 arranged at one axial end of the core body 210, and the side of the core body 210 away from the pointed portion 220 is inwardly recessed to form a deformation groove 230.

[0067] The pointed portion 220 is conical, and the circumferential sidewall surface thereof is arc-shaped, and the inner bottom of the deformation groove 230 is formed with a deformation space matching the shape of the pointed portion 220.

[0068] The outer diameter of the core 210 and the sliding space formed between the positioning ribs 140 are in clearance fit, and the shape of the fitting groove 320 is also adapted to the arc surface of the pointed part 220.

[0069] Therefore, by the valve core 200 in the above-mentioned mode, when the liquid backflow flows into the hollow part in the deformation groove 230, the pressure of the valve core 200 to the gasket 300 is increased, so that the sealing is more reliable.

[0070] The beneficial effects of the utility model are as follows:

[0071] The utility model discloses a fitting groove that is adapted to the shape of the surface of the valve core is arranged on the gasket, which can further increase the contact area of the valve core and the gasket and fully improve the sealing performance thereof. Meanwhile, the movement space of the valve core is limited by the positioning rib, and the positioning groove that is embedded with the positioning rib is arranged on the gasket, so that the rotation of the gasket in the circumferential direction is limited, and the gasket can always remain stable, which can be applicable to various scenes with high sealing performance requirements such as chemical industry and medical treatment.

[0072] In addition, by additionally designing the first sealing groove, the second sealing groove and the third sealing groove on the sealing gasket, the inner and outer sides of the sealing gasket in contact with the gasket and the end side in contact with the socket joint can be further sealed and compressed, and the sealing performance thereof is fully improved.

[0073] The utility model has been exemplarily described above in combination with the drawings, and obviously, the specific implementation of the utility model is not limited by the above-mentioned mode. As long as various non-essential improvements are made by adopting the method concept and technical scheme of the utility model, or the concept and technical scheme of the utility model is directly applied to other occasions without improvement, all of them are within the protection scope of the utility model.

Claims

1. A plastic ball check valve characterized by, The utility model relates to a valve structure, including valve body (100), valve core (200), gasket (300), sealing gasket (400), socket joint (500) and lock nut (600), wherein: The inside of the valve body (100) is formed with an inner cavity (110) along the axial direction thereof; The socket joint (500) is locked to the axial end of the valve body (100) through the lock nut (600); The gasket (300) and the sealing gasket (400) are sequentially arranged at the connecting position of the valve body (100) and the socket structure; The inner wall of the inner cavity (110) is provided with a plurality of positioning ribs (140) around the central axis of the valve body (100), and the valve core (200) is slidingly limited in the space formed between the plurality of positioning ribs (140); The side of the gasket (300) facing the inner cavity (110) is provided with a matching groove (320) adapted to the surface shape of the valve core (200); The side of the gasket (300) facing the inner cavity (110) is provided with a plurality of positioning grooves (330) around the circumference thereof, which are embedded in and correspond to the positioning ribs (140).

2. A plastic ball check valve according to claim 1, wherein The positioning rib (140) is in the form of a sheet and extends along the axial direction of the valve body (100), and the side of the positioning rib (140) away from the socket joint (500) protrudes towards the central axis of the valve body (100) to form a stop edge (141) for stopping the valve core (200).

3. A plastic ball check valve according to claim 1 wherein, The positioning rib (140) is uniformly provided with at least three around the central axis of the valve body (100).

4. A plastic ball check valve according to claim 3, wherein The positioning rib (140) is uniformly provided with six around the central axis of the valve body (100).

5. A plastic ball check valve according to claim 1 wherein, The upper end surface of the positioning rib (140) and the upper end opening of the inner cavity (110) form an installation space (150) for sequentially stacking the gasket (300) and the sealing gasket (400), and when the gasket (300) and the sealing gasket (400) are sequentially stacked in the installation space (150), the upper end surface of the sealing gasket (400) is flush with the upper end opening of the inner cavity (110).

6. A plastic ball check valve according to claim 1 wherein, The gasket (300) is in the form of a ring and has a through-flow hole (310) formed in the middle thereof.

7. A plastic ball check valve according to claim 6 wherein, The valve core (200) is in the form of a sphere, and the matching groove (320) is an arc-shaped wall surface recessed inward along the side wall of the through-flow hole (310) and embedded in the upper part of the valve core (200).

8. A plastic ball check valve according to claim 6 wherein, The side of the gasket (300) away from the matching groove (320) is recessed inward to form a positioning ring groove (340) distributed around the circumferential side of the through-flow hole (310), and the sealing gasket (400) protrudes along the axial direction thereof to form a positioning portion (420) embedded in the positioning ring groove (340).

9. A plastic ball check valve according to claim 8, wherein The sealing gasket (400) is provided with a first sealing groove (430) distributed around the opening thereof on the inner side of the positioning portion (420), the side of the sealing gasket (400) close to the gasket (300) is recessed inward around the outer circumferential side thereof to form a second sealing groove (440), the side of the sealing gasket (400) away from the gasket (300) is provided with a third sealing groove (450) distributed around the opening thereof, and the first sealing groove (430), the second sealing groove (440) and the third sealing groove (450) are provided with sealing rings.

10. A plastic ball check valve according to claim 1 wherein, The valve body (100) is provided with a socket joint (500) at the top and bottom along the axial direction, and is locked and fixed at the end of the valve body (100) through a locking nut (600).

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