Fluorine lining check valve
By employing detachable mating parts and guide components in the fluoropolymer-lined check valve, the problem of easy displacement of the fluoroplastic layer at the lower end of the valve disc is solved, achieving efficient sealing and corrosion resistance, and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-24
- Publication Date
- 2026-03-27
AI Technical Summary
In environments where corrosive media are transported, the fluoroplastic layer at the lower end of the valve disc of a fluoropolymer-lined check valve is prone to displacement and damage, resulting in poor sealing performance and reduced reliability of corrosion protection.
The system employs a detachable connection structure between the first and second mating parts, combined with a groove design and guide components, to ensure stable movement and limiting of the valve disc, and to enhance the connection strength and corrosion resistance of the fluoroplastic layer.
It reduces maintenance costs, improves sealing and corrosion resistance, and ensures stable operation and reliability of the valve.
Smart Images
Figure CN224049747U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of valves, in particular to a fluorine-lined check valve. BACKGROUND
[0002] In an industrial fluid conveying system, a valve is a key component for controlling fluid flow and plays a vital role. Among them, the check valve refers to a valve with a circular valve disc that acts to block the backflow of the medium by relying on its own weight and the pressure of the medium. In some conveying environments with corrosive media, fluorine-lined check valves with good corrosion resistance are generally used. By adding a fluoroplastic layer to the check valve, the internal surface is protected, and the influence of corrosive fluids is reduced to ensure stable operation of the system. During the use of the fluorine-lined check valve, the impact and friction between the valve disc and the valve body can cause damage. Generally, the valve body or valve disc is replaced as a whole, but this method has a high maintenance cost.
[0003] At present, in the related technology, an annular detachable part is arranged at the lower end of the valve disc and the contact part between the valve body and the valve disc to realize local disassembly of the valve core and the easily damaged part of the valve body, thereby reducing the maintenance cost.
[0004] However, since the annular detachable part is used, a joint exists between the detachable part and the lower end of the valve disc, and relative movement easily occurs between the detachable part and the valve disc when the valve disc and the valve body contact each other. Therefore, the connection reliability of the fluoroplastic layer wrapped around the outer periphery of the valve disc and the detachable part, especially the fluoroplastic layer at the lower end surface position in contact with the valve body, is poor. In addition, the lower end of the valve disc after the detachable part is installed lacks a fixing and limiting structure for the fluoroplastic layer, and especially when the valve disc horizontally shakes, the fluoroplastic layer is easily displaced relative to the valve disc, thereby causing uneven stress on the fluoroplastic layer at some points, increasing the risk of deformation and damage of the fluoroplastic layer, and further affecting the sealing effect and the reliability of the corrosion protection of the metal substrate.
[0005] In the above related technology, the fluoroplastic layer at the lower end of the valve disc is easily displaced and damaged. CONTENT OF THE UTILITY MODEL
[0006] In order to improve the problem that the fluoroplastic layer at the lower end of the valve disc is easily displaced and damaged, the application provides a fluorine-lined check valve.
[0007] The fluorine-lined check valve provided by the application adopts the following technical scheme:
[0008] The application relates to a fluorine-lined check valve, which comprises a valve body, a valve cover, a valve rod and a valve disc, the valve body is provided with an inlet channel and an outlet channel which are communicated with each other, the valve cover is arranged at the upper end of the valve body, the valve cover is provided with a guide sleeve, the guide sleeve is sleeved on the outer periphery of the valve rod, the valve rod is in sliding fit with the guide sleeve, the end of the valve rod away from the valve cover is connected with the valve disc, the valve disc is used for selectively connecting or disconnecting the inlet channel and the outlet channel, the check valve further comprises a first fitting part, the first fitting part is connected with the valve disc, the first fitting part is arranged on the side of the valve disc away from the valve rod, the first fitting part is detachably connected with the valve disc, a groove is arranged in the middle of the side of the first fitting part away from the valve rod, the opening of the groove faces away from the valve rod, the groove bottom area is larger than the groove opening area, the outer peripheries of the valve rod, the valve disc and the first fitting part are provided with a first fluoroplastic layer, a second fitting part is arranged at the joint of the inlet channel and the outlet channel, the second fitting part is detachably connected with the valve body, the lower end surface of the first fitting part is used for cooperating with the upper end surface of the second fitting part, so that the inlet channel and the outlet channel are selectively connected or disconnected, and the surfaces of the inlet channel, the outlet channel, the lower end of the valve cover, the guide sleeve and the second fitting part are provided with a second fluoroplastic layer.
[0009] By adopting the technical scheme, the cooperation between the first fitting part and the second fitting part realizes the selective connection or disconnection of the inlet channel and the outlet channel, and the fluid is controlled to be connected or disconnected; the first fitting part is arranged on the valve disc and is detachably connected, the second fitting part is arranged at the joint of the inlet channel and the outlet channel and is detachably connected with the valve body, so that the valve disc and the valve body can be conveniently maintained and replaced after being abraded, the valve disc and the valve body do not need to be replaced, and the maintenance cost is reduced; the groove is designed to optimize the fluid flow characteristics, so that the function of the check valve is smoothly realized, and the groove bottom area is larger than the groove opening area, so that the first fluoroplastic layer wrapped around the outer peripheries of the valve rod, the valve disc and the first fitting part can realize the limiting effect through the groove, the connection strength between the first fluoroplastic layer and the first fitting part is improved, the risk that the first fluoroplastic layer is locally damaged due to the relative displacement between the first fluoroplastic layer and the first fitting part and the tensile force is reduced, and the corrosion resistance effect is optimized; the first fitting part is arranged on the lower end of the valve disc, the cooperation gap of the plane where the valve disc and the valve body are in contact is reduced, and the problem that the first fluoroplastic layer is easily displaced due to the relative movement is alleviated; the second fitting part is arranged at the joint of the inlet channel and the outlet channel and is detachably connected with the valve body, so that the check valve is conveniently maintained; the second fluoroplastic layer on the surfaces of the inlet channel, the outlet channel, the lower end of the valve cover, the guide sleeve and the second fitting part also enhances the corrosion resistance, and the corrosion resistance effect of the whole check valve is improved.
[0010] Optionally, the lower end surface of the first fitting is provided with a plurality of recesses, the upper end surface of the second fitting is provided with a plurality of protrusions, the recesses and the protrusions are correspondingly arranged, the inner side of the first fluoroplastic layer is attached to the inner circumferential surface of the recesses, and the lower side of the first fluoroplastic layer at the recesses is a flat surface; the inner side of the second fluoroplastic layer is attached to the outer circumferential surface of the protrusions, and the upper side of the second fluoroplastic layer at the protrusions is a flat surface.
[0011] By adopting the above technical solution, the lower end surface of the first fitting is provided with a plurality of recesses, the inner side of the first fluoroplastic layer is attached to the inner circumferential surface of the recesses, and the lower side of the first fluoroplastic layer at the recesses is a flat surface; the upper end surface of the second fitting is provided with a plurality of protrusions, and the inner side of the second fluoroplastic layer is attached to the outer circumferential surface of the protrusions, and the upper side of the second fluoroplastic layer at the protrusions is a flat surface. The contact area between the first fitting and the first fluoroplastic layer, and the contact area between the second fitting and the second fluoroplastic layer can be increased, the connection strength of the first fluoroplastic layer and the second fluoroplastic layer can be improved, and the possibility of displacement of the first fluoroplastic layer and the second fluoroplastic layer can be reduced. Meanwhile, the flat lower side of the first fluoroplastic layer and the flat upper side of the second fluoroplastic layer at the contact and fitting position of the first fitting and the second fitting help the fluid to flow more smoothly, reduce the flow resistance, and optimize the sealing effect. Furthermore, by correspondingly arranging the recesses and the protrusions, rigid collision can be avoided, the risk of affecting the sealing performance can be reduced, and the use performance and reliability of the fluorine-lined check valve can be improved.
[0012] Optionally, the guide assembly comprises a guide, a sliding sleeve and a support frame, the upper end of the guide is connected to the valve disc, the length of the guide extends vertically, the support frame is connected to the valve body, the support frame is used for erecting the sliding sleeve, the sliding sleeve is arranged below the valve disc, and the guide is slidably arranged in the sliding sleeve to vertically move the valve disc.
[0013] By adopting the above technical solution, the support frame is connected to the valve body to fix the position of the sliding sleeve, so that the sliding sleeve remains stable and provides a stable support structure for the sliding of the guide. The upper end of the guide of the guide assembly is connected to the valve disc and extends vertically, the sliding sleeve is erected below the valve disc by the support frame and is provided for the guide to slide therethrough, so that the guide can only move along the path defined by the sliding sleeve. When the fluid pushes the valve disc to move, the guide can provide directional guidance for the movement of the valve disc, so as to ensure that the valve disc can stably vertically move and avoid deviation or shaking of the valve disc during movement, thereby ensuring smooth vertical movement of the valve disc and accurate connection or disconnection of the inflow passage and the outflow passage. Meanwhile, the possibility of displacement of the first fluoroplastic layer and the second fluoroplastic layer due to the horizontal displacement between the valve disc and the valve body can be reduced.
[0014] Optionally, the guide slides in a sliding hole of the sliding sleeve, the guide has a same cross section as the sliding hole, and the guide is a prism or an elliptic cylinder to limit circumferential rotation of the valve disc.
[0015] By adopting the above technical solutions, when the valve disc moves, the guide can slide in the sliding hole of the sliding sleeve to provide guidance for vertical movement of the valve disc, and ensure smooth movement of the valve disc in the vertical direction. The guide is designed as a prism or an elliptic cylinder, and the non-circular shape of the guide can be used to limit circumferential rotation of the valve disc in cooperation with the sliding hole, so that the position of the valve disc is more stable during operation, and the connection or disconnection of the inlet flow passage and the outlet flow passage is more accurate and reliable, and the risk of displacement of the first fluoroplastic layer and the second fluoroplastic layer due to circumferential movement of the valve disc is reduced.
[0016] Optionally, the connection between the inlet flow passage and the outlet flow passage is provided with a mounting groove, and the second matching member is provided with a mounting portion, and the mounting portion cooperates with the mounting groove.
[0017] By adopting the above technical solutions, the mounting groove at the connection between the inlet flow passage and the outlet flow passage cooperates with the mounting portion of the second matching member, which facilitates installation and preliminary positioning of the second matching member on the valve body, so that the second matching member can be accurately arranged at the connection between the inlet flow passage and the outlet flow passage, and the first matching member and the second matching member can be cooperated to selectively connect or disconnect the inlet flow passage and the outlet flow passage.
[0018] Optionally, the mounting groove is provided with a first limiting structure, and the mounting portion is provided with a second limiting structure, and the second limiting structure cooperates with the first limiting structure.
[0019] By adopting the above technical solutions, the first limiting structure of the mounting groove and the second limiting structure of the mounting portion cooperate with each other to further position the second matching member. The mounting groove serves as a basic position for mounting the second matching member, and determines the mounting space of the second matching member. The first limiting structure provides a limiting function for the mounting groove, and can prevent the second matching member from moving randomly. The mounting portion is a part of the second matching member specially used for cooperation with the mounting groove, and directly connects with the mounting groove. The second limiting structure provides a cooperation structure corresponding to the first limiting structure, so that the second matching member is accurately and stably mounted at the predetermined position, and the stability and reliability of the overall structure of the fluorine-lined check valve are ensured.
[0020] Optionally, the mounting portion is provided with a third limiting structure, and the third limiting structure is used for cooperation with the second fluoroplastic layer.
[0021] By adopting the above technical solutions, the positioning accuracy between the second fluoroplastic layer and the mounting portion can be improved, and accidental movement of the second fluoroplastic layer relative to the mounting portion can be limited, so that the stability and reliability of the fluorine-lined check valve are improved.
[0022] Optionally, the first fitting and the valve disc are connected by a plurality of first bolts, and the plurality of first bolts are evenly distributed on both sides of the valve stem.
[0023] By adopting the above technical scheme, the first fitting and the valve disc are connected by a plurality of first bolts evenly distributed on both sides of the valve stem, which makes the connection of the first fitting and the valve disc more stable and reliable, facilitates disassembly and maintenance, and can ensure uniform stress and improve the working stability of the entire fluorine-lined check valve.
[0024] Optionally, the second fitting and the valve body are connected by a plurality of second bolts, and the plurality of second bolts are evenly distributed in the circumferential direction of the second fitting.
[0025] By adopting the above technical scheme, the second fitting and the valve body are connected by a plurality of second bolts evenly distributed in the circumferential direction of the second fitting, which can ensure the stable connection of the second fitting and the valve body, enhance the connection reliability, and facilitate disassembly.
[0026] Optionally, the guide sleeve is provided with an elastic member and a pressure regulating hole, the upper end of the elastic member is connected to the valve cover, the lower end of the elastic member is connected to the valve stem, and the pressure regulating hole penetrates the side wall of the guide sleeve.
[0027] By adopting the above technical scheme, the elastic member connects the valve cover and the valve stem, which can buffer and reset the valve stem, ensuring the stability and accuracy of the movement of the valve stem; the pressure regulating hole penetrates the side wall of the guide sleeve, which can balance the pressure in the guide sleeve, avoid affecting the normal sliding of the valve stem due to pressure difference, and make the selective on-off of the valve disc to the inlet passage and the outlet passage more stable and reliable.
[0028] In summary, the present application has at least one of the following beneficial technical effects:
[0029] 1. The valve stem, the valve body, the first fitting, the inlet passage, the outlet passage, the lower end of the valve cover, and the guide sleeve are provided with a first fluoroplastic layer, and the second fluoroplastic layer can improve the corrosion resistance of the valve, avoid corrosion of the valve when it is in contact with strong corrosive media for a long time, and ensure normal operation of the system.
[0030] 2. The first fitting and the second fitting cooperate to realize the selective on-off of the inlet passage and the outlet passage, and they can be detachably connected, which facilitates maintenance and replacement of parts, and the cooperation of the lower end surface of the first fitting and the upper end surface of the second fitting can ensure good sealing performance and prevent fluid leakage.
[0031] 3. The guide assembly enables the valve disc to move vertically and limits its circumferential rotation, which can improve the accuracy and reliability of the opening and closing control of the valve, reduce the risk of discoloration caused by displacement of the first fluoroplastic layer and the second fluoroplastic layer due to circumferential rotation of the valve disc, and improve the anti-corrosion reliability. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of a fluoropolymer-lined check valve according to an embodiment of this application.
[0033] Figure 2 yes Figure 1 Cross-sectional view at point AA.
[0034] Figure 3 yes Figure 2 Enlarged view of point B in the middle.
[0035] Figure 4 This is a schematic diagram of the guide component according to an embodiment of this application.
[0036] Figure 5 This is a schematic diagram of another form of the first mating component in an embodiment of this application.
[0037] Explanation of reference numerals in the attached figures:
[0038] 100. Valve body; 110. Inlet channel; 120. Outlet channel; 200. Valve cover; 300. Valve stem; 400. Valve disc; 500. Guide sleeve;
[0039] 1. First mating part; 11. Groove; 12. Recess;
[0040] 2. Second mating part; 21. Protrusion; 22. Mounting part; 221. Third limiting structure;
[0041] 3. First fluoroplastic layer; 4. Second fluoroplastic layer;
[0042] 5. Guide assembly; 51. Guide component; 52. Sliding sleeve; 53. Support frame;
[0043] 6. Mounting slot; 61. First limiting structure;
[0044] 71. First bolt; 72. Second bolt;
[0045] 81. Elastic element; 82. Pressure regulating hole. Detailed Implementation
[0046] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be further described in detail below. In this embodiment, unless otherwise specified, "connection", "linking", and "fixing" are interpreted broadly, including fixed connection, detachable connection, connection to form an integral structure, mechanical connection, electrical connection, direct connection, indirect connection through an intermediary, internal connection, and interaction between two components, etc., and can be understood according to the specific circumstances.
[0047] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, in the description of the present embodiment, the terms "on", "under", "left", "right", and other orientation or position relationships shown in the drawings are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do 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 on the present application. Unless otherwise stated, the orientation words used in the present application, such as "inner" and "outer", refer to the contour of the corresponding parts.
[0048] As shown in Figure 1 , Figure 2 and Figure 3 , the present embodiment discloses a fluorine-lined check valve (hereinafter referred to as "check valve"). The check valve comprises a valve body 100, a valve cover 200, a valve stem 300 and a valve disc 400. The valve body 100 is provided with an inlet passage 110 and an outlet passage 120 which are in communication with each other to allow fluid to flow in and out. The valve cover 200 is arranged at the upper end of the valve body 100, and the valve cover 200 is provided with a guide sleeve 500 which is sleeved on the outer periphery of the valve stem 300, and the valve stem 300 is in sliding fit with the guide sleeve 500. The end of the valve stem 300 away from the valve cover 200 is connected to the valve disc 400, and the valve disc 400 can move vertically to selectively connect or disconnect the inlet passage 110 and the outlet passage 120. In the present embodiment, for the convenience of description, the cavity in the valve body 100 is divided into the inlet passage 110 and the outlet passage 120 when the first fitting part 1 and the second fitting part 2 are in abutting fit.
[0049] The check valve further comprises a first fitting part 1 and a second fitting part 2. The cooperation of the first fitting part 1 and the second fitting part 2 realizes the selective connection and disconnection of the inlet passage 110 and the outlet passage 120, thereby controlling the fluid connection and disconnection. The first fitting part 1 is connected to the valve disc 400, and the first fitting part 1 is arranged on the side of the valve disc 400 away from the valve stem 300. The first fitting part 1 is detachably connected to the valve disc 400. The second fitting part 2 is arranged at the connection between the inlet passage 110 and the outlet passage 120, and the second fitting part 2 is detachably connected to the valve body 100. The lower end surface of the first fitting part 1 is used to cooperate with the upper end surface of the second fitting part 2 to selectively connect or disconnect the inlet passage 110 and the outlet passage 120. The first fitting part 1 is arranged on the valve disc 400 and is detachably connected, and the second fitting part 2 is arranged at the connection between the inlet passage 110 and the outlet passage 120 and is detachably connected to the valve body 100. This can facilitate maintenance and replacement after wear in use. Only the first fitting part 1 and the second fitting part 2 can be replaced, and the valve disc 400 and the valve body 100 do not need to be replaced as a whole, thereby reducing the maintenance cost.
[0050] As Figure 1 , Figure 2 and Figure 3 shown, the upper end surface of the first fitting piece 1 is circular, and the size is adapted to the valve disc 400, so as to increase the connection area of the first fitting piece 1 and the valve disc 400, and improve the stability. The middle part of the side of the first fitting piece 1 away from the valve stem 300 is provided with a groove 11, the opening of the groove 11 faces away from the valve stem 300, and the bottom area of the groove 11 is larger than the opening area of the groove 11. The valve stem 300, the valve disc 400 and the outer periphery of the first fitting piece 1 are all provided with a first fluoroplastic layer 3; the inflow channel 110, the outflow channel 120, the lower end of the valve cover 200, the guide sleeve 500 and the surface of the second fitting piece 2 are all provided with a second fluoroplastic layer 4, which enhances the corrosion resistance and improves the corrosion resistance effect of the entire check valve. The materials of the first fluoroplastic layer 3 and the second fluoroplastic layer 4 can be the same or different, such as polytetrafluoroethylene, polytetrafluoroethylene, etc., which can be selected according to the needs.
[0051] The groove 11 is designed to optimize the fluid flow characteristics, so that the function of the check valve can be realized smoothly; on the other hand, since the bottom area of the groove 11 is larger than the opening area, the first fluoroplastic layer 3 coated on the outer periphery of the valve stem 300, the valve disc 400 and the first fitting piece 1 can realize the limiting effect through the groove 11, improve the connection strength of the first fluoroplastic layer 3 and the first fitting piece 1, reduce the risk of local damage of the first fluoroplastic layer 3 due to relative displacement of the first fluoroplastic layer 3 and the first fitting piece 1, and optimize the corrosion resistance effect. The setting mode of the first fitting piece 1 covering the lower end of the valve disc 400 reduces the fitting gap of the plane where the valve disc 400 provided with the first fitting piece 1 contacts the valve body 100, and alleviates the problem that the first fluoroplastic layer 3 is prone to displacement due to relative movement of the fitting part. At the same time, through the redundant part of the first fluoroplastic layer 3 in the groove 11, when the first fluoroplastic layer 3 is subjected to pulling action, the risk of direct pulling and breaking of the first fluoroplastic layer 3 can be reduced through the redundant part, and the reliability of corrosion resistance is further improved. Specifically, the second fitting piece 2 is an annular structure.
[0052] As Figure 1 , Figure 2 and Figure 3As shown, the guide sleeve 500 is provided with an elastic member 81 and a pressure regulating hole 82. The upper end of the elastic member 81 is connected to the valve cover 200, and the lower end of the elastic member 81 is connected to the valve rod 300. The elastic member 81 connects the valve cover 200 and the valve rod 300, and can buffer and reset the valve rod 300, thereby ensuring the stability and accuracy of the movement of the valve rod 300. The pressure regulating hole 82 penetrates the side wall of the guide sleeve 500, can balance the pressure in the guide sleeve 500, avoid affecting the normal sliding of the valve rod 300 due to pressure difference, and make the selective on-off of the valve disc 400 to the inlet passage 110 and the outlet passage 120 more stable and reliable. Specifically, the elastic member 81 is a spring; and the pressure regulating hole 82 can be provided with a plurality of pressure regulating holes.
[0053] As shown in Figure 2 , Figure 3 and Figure 4 , optionally, the check valve further comprises a guide assembly 5. The guide assembly 5 comprises a guide piece 51, a sliding sleeve 52 and a support frame 53. The upper end of the guide piece 51 is connected to the valve disc 400, and the length of the guide piece 51 extends vertically. The support frame 53 is connected to the valve body 100, and the support frame 53 is used to erect the sliding sleeve 52, thereby fixing the position of the sliding sleeve 52 and keeping the sliding sleeve 52 stable, and providing a stable support structure for the sliding of the guide piece 51. The sliding sleeve 52 is arranged below the valve disc 400, and the guide piece 51 slides through the sliding sleeve 52, thereby vertically moving the valve disc 400.
[0054] In the embodiment, the guide piece 51 is detachably connected to the first matching piece 1, and is connected to the valve disc 400 through the first matching piece 1. When the fluid pushes the valve disc 400 to move, the guide piece 51 can provide direction guidance for the movement of the valve disc 400, thereby ensuring that the valve disc 400 can stably and vertically move, avoiding the valve disc 400 from deviating or shaking during the movement, thereby ensuring the smooth vertical movement of the valve disc 400 and realizing the accurate connection or disconnection of the inlet passage 110 and the outlet passage 120. At the same time, the possibility of displacement of the first fluoroplastic layer 3 and the second fluoroplastic layer 4 due to the existence of horizontal displacement between the valve disc 400 and the valve body 100 is reduced.
[0055] As shown in Figure 2 , Figure 3 and Figure 4 , optionally, the guide piece 51 slides through the sliding hole of the sliding sleeve 52. The cross section of the guide piece 51 is the same as the shape of the sliding hole, and the guide piece 51 is a prism or an elliptical cylinder, thereby limiting the circumferential rotation of the valve disc 400.
[0056] When the valve disc 400 moves, the guide 51 can slide in the sliding hole of the sliding sleeve 52 to provide guidance for the vertical movement of the valve disc 400, and ensure that the valve disc 400 moves smoothly in the vertical direction. The guide 51 is designed as a prism or an elliptical cylinder, and the non-circular shape feature thereof can be used to cooperate with the sliding hole to limit the circumferential rotation of the valve disc 400, so that the position of the valve disc 400 is more stable during the operation, thereby making the connection or disconnection of the inlet flow passage 110 and the outlet flow passage 120 more accurate and reliable, and reducing the risk of displacement of the first fluoroplastic layer 3 and the second fluoroplastic layer 4 due to the circumferential movement of the valve disc 400. The outer periphery of the guide assembly 5 is covered with the first fluoroplastic layer 3 or the second fluoroplastic layer 4 (not shown in the figure) to improve the corrosion resistance. It can be understood that the parts of the check valve that can be in contact with the fluid are covered with the first fluoroplastic layer 3 or the second fluoroplastic layer 4.
[0057] As shown in Figure 2 and Figure 3 Optionally, the lower end surface of the first fitting member 1 is provided with a plurality of recessed portions 12, and the upper end surface of the second fitting member 2 is provided with a plurality of protruding portions 21, and the recessed portions 12 and the protruding portions 21 are correspondingly arranged. The inner side of the first fluoroplastic layer 3 is attached to the inner peripheral surface of the recessed portion 12, and the lower side of the first fluoroplastic layer 3 at the recessed portion 12 is a flat surface; the inner side of the second fluoroplastic layer 4 is attached to the outer peripheral surface of the protruding portion 21, and the upper side of the second fluoroplastic layer 4 at the protruding portion 21 is a flat surface. In this embodiment, the recessed portion 12 is a semicircular concave structure, and the protruding portion 21 is a semicircular convex structure, and the recessed portion 12 is matched with the protruding portion 21.
[0058] The lower end surface of the first fitting member 1 is provided with a plurality of recessed portions 12, and the inner side of the first fluoroplastic layer 3 is attached to the inner peripheral surface of the recessed portion 12 and filled, so that the lower side of the first fluoroplastic layer 3 at the recessed portion 12 is a flat surface; the upper end surface of the second fitting member 2 is provided with a plurality of protruding portions 21, and the inner side of the second fluoroplastic layer 4 is attached to the outer peripheral surface of the protruding portion 21 and the upper side of the second fluoroplastic layer 4 at the protruding portion 21 is a flat surface, which can increase the contact area between the first fitting member 1 and the first fluoroplastic layer 3, and the contact area between the second fitting member 2 and the second fluoroplastic layer 4, improve the connection strength of the first fluoroplastic layer 3 and the second fluoroplastic layer 4, and reduce the possibility of displacement of the first fluoroplastic layer 3 and the second fluoroplastic layer 4. At the same time, the flat lower side of the first fluoroplastic layer 3 and the flat upper side of the second fluoroplastic layer 4 at the contact and fitting position of the first fitting member 1 and the second fitting member 2 help the fluid to flow more smoothly, reduce the flow resistance, and at the same time optimize the sealing effect. Moreover, by correspondingly providing the recessed portion 12 and the protruding portion 21, rigid collision can be avoided and the risk of affecting the sealing performance is reduced, thereby improving the use performance and reliability of the check valve.
[0059] As shown in Figure 2 and Figure 3As shown, optionally, the installation groove 6 is arranged at the joint of the inlet flow channel 110 and the outlet flow channel 120, and the installation portion 22 is arranged on the second matching piece 2, and the installation portion 22 is matched with the installation groove 6, so as to facilitate the installation and preliminary positioning of the second matching piece 2 on the valve body 100, and the second matching piece 2 can be accurately arranged at the joint of the inlet flow channel 110 and the outlet flow channel 120, which is beneficial to the cooperation of the first matching piece 1 and the second matching piece 2 to realize the selective on-off of the inlet flow channel 110 and the outlet flow channel 120. The installation groove 6 is annular, and the installation portion 22 is arranged in an L-shaped longitudinal section, which helps to improve the horizontal limiting effect and reduce the risk of horizontal movement of the second matching piece 2.
[0060] As shown in Figure 2 and Figure 3 As shown, optionally, the installation groove 6 is arranged at the joint of the inlet flow channel 110 and the outlet flow channel 120, and the installation portion 22 is arranged on the second matching piece 2, and the installation portion 22 is matched with the installation groove 6, so as to facilitate the installation and preliminary positioning of the second matching piece 2 on the valve body 100, and the second matching piece 2 can be accurately arranged at the joint of the inlet flow channel 110 and the outlet flow channel 120, which is beneficial to the cooperation of the first matching piece 1 and the second matching piece 2 to realize the selective on-off of the inlet flow channel 110 and the outlet flow channel 120. The installation groove 6 is annular, and the installation portion 22 is arranged in an L-shaped longitudinal section, which helps to improve the horizontal limiting effect and reduce the risk of horizontal movement of the second matching piece 2.
[0061] As shown in Figure 2 and Figure 3 As shown, optionally, the installation portion 22 is provided with a third limiting structure 221 on the side surface, and the third limiting structure 221 is used for cooperation with the second matching piece 2.
[0062] The third limiting structure 221 can be a convex semispherical structure, and the second fluoroplastic layer 4 is provided with a groove-shaped structure matched with the third limiting structure 221, which can better limit the vertical displacement of the second fluoroplastic layer 4 after assembly, avoid the separation of the second fluoroplastic layer 4 from the installation portion 22, and improve the stability and reliability of the fluorine-lined check valve. The third limiting structure 221 can also be a three-quarter spherical structure, and the second fluoroplastic layer 4 has a certain elasticity and can be assembled with the third limiting structure 221 by pressing, so that the second fluoroplastic layer 4 is clamped with the installation portion 22, and the relative fixing effect is optimized. Specifically, the connection form of the first fluoroplastic layer 3 and the second fluoroplastic layer 4 is not limited.
[0063] As shown inFigure 2 And Figure 3 As shown in
[0064] As shown in Figure 5 The first fitting 1 can be provided with a clamping portion at the upper end, and the valve disc 400 is provided with a clamping groove at the upper end, so that the clamping portion cooperates with the clamping groove to realize the connection with the valve disc 400. The clamping portion can, on the one hand, make the joint of the first fitting 1 and the valve disc 400 away from the lower end of the first fitting 1, thereby reducing the influence of the joint on the stability of the first fluoroplastic layer 3; on the other hand, the first bolt 71 can be selectively used on the basis of the clamping of the first fitting 1 and the valve disc 400, thereby improving the applicability. Further, the clamping portion can be assembled with the first fitting 1 to facilitate disassembly.
[0065] As shown in Figure 2 And Figure 3 As shown in
[0066] It can be understood that the check valve also includes necessary structures for connection, support, driving, positioning, limiting, sealing, and control, etc., so that the check valve can operate normally; the shape, size, material, and setting number of each part of the check valve can be determined according to the needs, and the corresponding functions can be realized.
[0067] The implementation principle of the fluorine-lined check valve provided in the embodiments of the present application is as follows: the cooperation of the first cooperating part 1 and the second cooperating part 2 realizes the selective opening and closing of the inflow passage 110 and the outflow passage 120, thereby controlling the opening and closing of the fluid; the first cooperating part 1 is arranged on the valve disc 400 and is detachably connected, and the second cooperating part 2 is arranged at the connection position of the inflow passage 110 and the outflow passage 120 and is detachably connected with the valve body 100, so that the valve can be conveniently maintained and replaced after being worn, and the valve disc 400 and the valve body 100 do not need to be replaced as a whole, thereby reducing the maintenance cost; the groove bottom area of the groove 11 is larger than the notch area, so that the first fluoroplastic layer 3 wrapped around the outer periphery of the valve rod 300, the valve disc 400 and the first cooperating part 1 can be limited by the groove 11, the connection strength of the first fluoroplastic layer 3 and the first cooperating part 1 is improved, the risk that the first fluoroplastic layer 3 is locally damaged due to the relative displacement of the first fluoroplastic layer 3 and the first cooperating part 1 and the tension of the first fluoroplastic layer 3 is reduced, and the corrosion resistance is optimized; the first cooperating part 1 is arranged in a manner of covering the lower end of the valve disc 400, so that the cooperation gap on the plane where the valve disc 400 provided with the first cooperating part 1 and the valve body 100 are in contact is reduced, and the problem that the first fluoroplastic layer 3 is easily displaced due to the relative movement is alleviated; the second cooperating part 2 is arranged at the connection position of the inflow passage 110 and the outflow passage 120 and is detachably connected with the valve body 100, so that the valve can be conveniently maintained and replaced; the second fluoroplastic layer 4 arranged on the surfaces of the inflow passage 110, the outflow passage 120, the lower end of the valve cover 200, the guide sleeve 500 and the second cooperating part 2 also enhances the corrosion resistance, and the corrosion resistance of the entire check valve is improved.
[0068] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. A fluorine-lined check valve comprising a valve body (100), a valve cover (200), a valve rod (300) and a valve disc (400), the valve body (100) being provided with an inlet passage (110) and an outlet passage (120) in communication with each other, the valve cover (200) being arranged at an upper end of the valve body (100), the valve cover (200) being provided with a guide sleeve (500), the guide sleeve (500) being sleeved on an outer periphery of the valve rod (300), the valve rod (300) being in sliding fit with the guide sleeve (500), an end of the valve rod (300) away from the valve cover (200) being connected with the valve disc (400), the valve disc (400) being used for selectively connecting or disconnecting the inlet passage (110) and the outlet passage (120), characterized in that, Also include: The first fitting piece (1) is connected to the valve disc (400), the first fitting piece (1) is provided on the side of the valve disc (400) away from the valve stem (300), the first fitting piece (1) is detachably connected to the valve disc (400), the middle of the side of the first fitting piece (1) away from the valve stem (300) is provided with a groove (11), the opening of the groove (11) faces away from the valve stem (300), the bottom area of the groove (11) is greater than the opening area of the groove (11), the valve stem (300), the valve disc (400) and the first fitting piece (1) are all provided with a first fluoroplastic layer (3); The second fitting piece (2) is provided at the connection between the inlet channel (110) and the outlet channel (120), the second fitting piece (2) is detachably connected to the valve body (100), the lower end surface of the first fitting piece (1) is used for cooperating with the upper end surface of the second fitting piece (2) to selectively open and close the inlet channel (110) and the outlet channel (120); the surfaces of the inlet channel (110), the outlet channel (120), the lower end of the valve cover (200), the guide sleeve (500) and the second fitting piece (2) are all provided with a second fluoroplastic layer (4).
2. The fluoropolymer lined check valve of claim 1, wherein, The lower end surface of the first fitting piece (1) is provided with a plurality of recesses (12), the upper end surface of the second fitting piece (2) is provided with a plurality of protrusions (21), the recesses (12) and the protrusions (21) are correspondingly arranged, the inner side of the first fluoroplastic layer (3) is attached to the inner circumferential surface of the recess (12), and the lower side of the first fluoroplastic layer (3) at the recess (12) is a plane, the inner side of the second fluoroplastic layer (4) is attached to the outer circumferential surface of the protrusion (21), and the upper side of the second fluoroplastic layer (4) at the protrusion (21) is a plane.
3. The fluoropolymer lined check valve of claim 1, wherein, It also includes a guide assembly (5), the guide assembly (5) includes a guide piece (51), a sliding sleeve (52) and a support frame (53), the upper end of the guide piece (51) is connected to the valve disc (400), the length of the guide piece (51) extends vertically, the support frame (53) is connected to the valve body (100), the support frame (53) is used for erecting the sliding sleeve (52), the sliding sleeve (52) is arranged below the valve disc (400), the guide piece (51) is slidably arranged in the sliding sleeve (52), so that the valve disc (400) moves vertically.
4. The fluoropolymer lined check valve of claim 3, wherein, The guide piece (51) is slidably arranged in the sliding hole of the sliding sleeve (52), the cross section of the guide piece (51) is the same as the shape of the sliding hole, the guide piece (51) is a prism or an elliptical cylinder, so as to limit the circumferential rotation of the valve disc (400).
5. The fluoropolymer lined check valve of claim 1, wherein, The connection between the inlet channel (110) and the outlet channel (120) is provided with a mounting groove (6), the second fitting piece (2) is provided with a mounting portion (22), and the mounting portion (22) cooperates with the mounting groove (6).
6. The fluoropolymer lined check valve of claim 5, wherein, The mounting groove (6) is provided with a first limiting structure (61), and the mounting portion (22) is provided with a second limiting structure matched with the first limiting structure (61).
7. The fluoropolymer lined check valve of claim 5, wherein, The mounting portion (22) is provided with a third limiting structure (221) matched with the second fluoroplastic layer (4).
8. The lined check valve of claim 1, wherein, The first matching piece (1) is connected with the valve clack (400) through a plurality of first bolts (71) which are evenly distributed on both sides of the valve stem (300).
9. The lined check valve of claim 1, wherein, The second matching piece (2) and the valve body (100) are connected through a plurality of second bolts (72) which are evenly distributed on the circumference of the second matching piece (2).
10. The fluoropolymer lined check valve of claim 1, wherein, The guide sleeve (500) is provided with an elastic member (81) and a pressure regulating hole (82), the upper end of the elastic member (81) is connected with the valve cover (200), the lower end of the elastic member (81) is connected with the valve stem (300), and the pressure regulating hole (82) penetrates the side wall of the guide sleeve (500).