Check valve

Abstract

The utility model discloses a check valve, which relates to the technical field of valves and comprises a valve body, a flow guide seat is fixed on the inner wall of one end, close to an inlet, in the valve body, a rotating seat with a door-shaped structure is fixed at the upper end of the side wall of one end, facing an outlet, of the flow guide seat, a rotating shaft is rotatably clamped in a U-shaped bayonet, and an overturning rod is fixed on the rotating shaft along the radial direction. The bottom end of the overturning rod is connected with a valve clack used for sealing the flow guide hole, a pressing plate covering the upper end of the rotating shaft is detachably arranged in the U-shaped bayonet, an elastic piece is fixed to the side wall of the pressing plate, and the end of the elastic piece is bent and extends to the side wall of the side, facing the outlet, of the overturning rod. The position of the side wall, facing the outlet, of the end of the elastic piece relative to the overturning rod is adjustable and used for balancing the overturning force of different fluid flow speeds on the valve clack around the rotating shaft, the requirements that the overturning rod drives the valve clack to rotate and fluid flows through the valve body are met, and meanwhile the situation that the flow guide hole cannot be sealed due to too small reverse rotation torque of the valve clack is avoided. Therefore, the fluid continuously flows, and the sealing performance of reverse cutoff is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a check valve. Background Art

[0002] The check valve is used in piping systems. Its main function is to prevent the backflow of media, the reversal of pumps and their driving motors, and the release of media in containers. It belongs to the automatic valve category, also known as non-return valve, one-way valve, reflux valve or isolation valve.

[0003] Among them, check valves can be mainly divided into three types according to their structure: lift check valves, swing check valves and butterfly check valves. The valve disc of the swing check valve is disc-shaped and rotates around the rotating shaft of the valve seat channel. Because the channel inside the valve is streamlined, the flow resistance is smaller than that of the lift check valve, which is suitable for large-caliber occasions with low flow rates and infrequent flow changes. Since the flow rates in different application scenarios are large and small, for swing valves, the torque force of the valve disc rotating around the rotating shaft after being impacted by fluids with different flow rates is different. At present, the valve disc rotates around the rotating shaft to open the flow passage, and the required flow impact force is relatively fixed. If the fluid flow rate is large, the valve disc cannot be reversed and reset after rotating around the rotating shaft, making it impossible for the valve disc to reversely rotate and close, affecting the sealing of the valve body. The valve body is in a continuously open state and cannot meet the flow interruption requirements. Therefore, a check valve is designed and produced here to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a check valve to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a check valve, comprising a valve body, one end of the valve body is an inlet, and the other end is an outlet, a flow guide seat is fixed to the inner wall of one end of the valve body close to the inlet, a flow guide hole is provided on the flow guide seat, a rotating seat of a door-type structure is fixed to the upper end of the side wall of the end of the flow guide seat facing the outlet, a U-shaped bayonet is provided on the upper end of the rotating seat, a rotating shaft is rotatably connected in the U-shaped bayonet, a flip rod is fixed to the rotating shaft along the radial direction to rotate and fit with the side walls on both sides of the rotating seat of the door-type structure, and a valve flap for sealing the flow guide hole is connected to the bottom end of the flip rod;

[0006] A pressure plate covering the upper end of the rotating shaft is detachably provided in the U-shaped bayonet, and the rotating shaft is rotatably fitted with the bottom wall of the pressure plate. An elastic member is fixed to the side wall of the pressure plate, and the end of the elastic member is bent and extends to the side wall of the flip rod facing the outlet, so as to provide elastic potential energy for the flip rod to drive the valve disc to rotate and press against the side wall of the guide hole opening.

[0007] In a further embodiment, the upper end of the valve body is connected to a mounting end communicating with the interior of the valve body, and the mounting end opening is threadedly connected to a valve cover.

[0008] In a further embodiment, a mounting plate is fixed to the inner side wall of the rotating seat, a threaded hole is provided on the mounting plate, an L-shaped plate is fixed to the upper end of the pressure plate, a mounting hole is provided at the horizontal end of the L-shaped plate, the mounting hole and the threaded hole are coaxially distributed, and a fastening bolt is threadedly connected between the mounting hole and the threaded hole.

[0009] In a further embodiment, the elastic member is a stainless steel spring sheet bent toward the outlet side.

[0010] In a further embodiment, a limiting tooth groove is provided on the side wall of the flip rod facing the outlet, and a conical clamping block is provided at the end of the stainless steel spring sheet, and the conical clamping block is clamped with the limiting tooth groove.

[0011] In a further embodiment, a plurality of columnar structured holders are provided on the side wall of the flip rod facing the outlet, and a C-shaped buckle capable of being clamped on the outer wall of the holder is provided at the end of the stainless steel spring sheet.

[0012] In a further embodiment, a side wall of the valve disc facing the guide hole is provided with a tapered embedding end that can be inserted into the guide hole.

[0013] In a further embodiment, an assembly block is fixed on the side wall of the valve disc facing the outlet, and a plug-in groove for plugging into the end of the flip rod is formed on the upper side wall of the assembly block. A threaded groove connected to the plug-in groove is formed on the side wall of the assembly block facing the outlet, and a limiting hole is formed on the end of the flip rod. A positioning bolt is threadedly connected in the threaded groove, and the end of the positioning bolt extends into the limiting hole.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model discloses a non-return valve, in which the position of the side wall of the end of the elastic member relative to the tilting rod facing the outlet is adjustable, and is used for balancing the tilting force of the valve disc around the rotating shaft due to different fluid flow rates, so as to satisfy the requirements of the tilting rod driving the valve disc to rotate and the fluid to flow through the valve body, and at the same time avoid the valve disc from rotating in the reverse direction with too small a torque, resulting in the guide hole being unable to be sealed, causing the fluid to flow continuously and affecting the sealing performance of the reverse flow cut-off. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural explosion diagram of an embodiment of the utility model;

[0017] Figure 2 This is a cross-sectional view of the valve body structure of an embodiment of the utility model;

[0018] Figure 3 This is an exploded view of the valve flap and rotating seat structure of an embodiment of the utility model;

[0019] Figure 4 It is a schematic diagram of a further improved structure of the flip rod and the limit member of an embodiment of the utility model.

[0020] In the figure: 1. valve body; 11. mounting end; 12. valve cover; 13. guide seat; 2. rotating seat; 21. flip rod; 22. rotating shaft; 23. mounting plate; 24. clamping seat; 3. valve disc; 31. assembly block; 4. elastic member; 41. pressure plate; 42. L-shaped plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment, this embodiment provides a check valve, such as Figure 1 and Figure 2 As shown, it includes a valve body 1, one end of the valve body 1 is an inlet, and the other end is an outlet. A guide seat 13 is fixed to the inner wall of the end of the valve body 1 close to the inlet, and the guide seat 13 is provided with a guide hole. The fluid enters the valve body 1 through the inlet and is discharged from the outlet through the guide hole of the guide seat 13. The above is the path of the fluid flowing through the valve body 1.

[0023] The upper end of the valve body 1 is connected to a mounting end 11 which is connected to the inside of the valve body 1. The opening of the mounting end 11 is threadedly connected to a valve cover 12. A rotating seat 2 of a door-shaped structure is fixed to the upper end of the side wall of the guide seat 13 facing the outlet. A U-shaped bayonet is provided at the upper end of the rotating seat 2. A rotating shaft 22 is rotatably connected in the U-shaped bayonet. A flip rod 21 is fixed to the rotating shaft 22 along the radial direction. A valve flap 3 for sealing the guide hole is connected to the bottom end of the flip rod 21. Figure 2 As shown, the valve cover 12 is unscrewed by rotating, and the valve disc 3, the flip rod 21 and the rotating shaft 22 are placed into the valve body 1 from the mounting end 11, and the rotating shaft 22 is rotated and clamped in the U-shaped bayonet, and then the valve cover 12 is rotated and sealed. Here, the rotating seat 2 is located at the upper end of the side wall of the flow guide seat 13, and the flip member composed of the rotating shaft 22 and the flip rod 21 rotates around the U-shaped bayonet, driving the valve disc 3 to rotate synchronously, opening and closing the diversion hole, and controlling the flow of fluid and blocking the flow of fluid.

[0024] Furthermore, a pressure plate 41 covering the upper end of the rotating shaft 22 is detachably provided in the U-shaped bayonet, and the rotating shaft 22 is rotatably fitted with the bottom wall of the pressure plate 41. An elastic member 4 is fixed to the side wall of the pressure plate 41, and the end of the elastic member 4 is bent and extends to the side wall of the flip rod 21 facing the outlet. The position of the end of the elastic member 4 relative to the side wall of the flip rod 21 facing the outlet is adjustable, so as to provide elastic potential energy for the flip rod 21 to drive the valve flap 3 to rotate and press against the side wall of the guide hole opening. The position of the end of the elastic member 4 relative to the side wall of the flip rod 21 facing the outlet is adjustable, so as to adjust the elastic potential energy of the elastic member 4, which is used to balance the flipping force of the valve flap 3 around the rotating shaft 22 due to different fluid flow rates. The bending deformation not only satisfies the requirement of the flip rod 21 to drive the valve flap 3 to rotate, but also satisfies the requirement of the fluid flowing through the valve body 1. At the same time, rebound potential energy is generated to rotate the valve flap 3 in the opposite direction to reset the valve flap 3 and block the guide hole, so as to avoid the elastic member 4 providing too small a rotational torque to the rotating shaft 22, resulting in the guide hole being unable to be sealed, causing the fluid to flow continuously and affecting the sealing performance of the reverse flow interruption.

[0025] The elastic member 4 here is a stainless steel spring sheet bent toward the outlet side. The stainless steel spring sheet has supporting strength and bending deformation characteristics.

[0026] The first embodiment of the elastic member 4 providing elastic potential energy for the flip rod 21 to drive the valve disc 3 to rotate and abut against the side wall of the guide hole opening is as follows: a limited tooth groove is provided on the side wall of the flip rod 21 facing the outlet, and a conical clamping block is provided at the end of the stainless steel spring piece, and the conical clamping block is clamped with the limited tooth groove. According to the impact force of different fluid flow rates on the valve disc 3, the specific position of the end of the stainless steel spring piece against the side wall of the flip rod 21 is adjusted, such as Figure 3 As shown, the conical block at the end of the stainless steel spring is against the limiting tooth groove at the corresponding position, and the stainless steel spring is in a bent state and has elastic potential energy. When the flow rate of the fluid flowing through the guide hole is lower than the elastic potential energy of the stainless steel spring, the stainless steel spring will be lowered on the side wall of the flip rod 21, and the flip rod 21 will be rotated with the rotating shaft 22 as the center, and the valve disc 3 will be closed at the guide hole to block the fluid flow.

[0027] The second embodiment of the elastic member 4 providing elastic potential energy for the flip rod 21 to drive the valve flap 3 to rotate against the side wall of the guide hole opening is as follows: a plurality of columnar structure holders 24 are provided on the side wall of the flip rod 21 facing the outlet, and a C-shaped buckle that can be clamped on the outer wall of the holder 24 is provided at the end of the stainless steel spring sheet. Figure 4 As shown, the C-shaped buckle is clamped on the corresponding position of the clamping seat 24, and the stainless steel spring is in a bent state and has elastic potential energy. When the flow rate of the fluid flowing through the guide hole is lower than the elastic potential energy of the stainless steel spring, the stainless steel spring will be lowered on the side wall of the flip rod 21, and the flip rod 21 is rotated around the rotating shaft 22, and the valve disc 3 is closed at the guide hole to block the flow of the fluid.

[0028] Furthermore, a mounting plate 23 is fixed to the inner wall of the rotating seat 2, and a threaded hole is opened on the mounting plate 23. An L-shaped plate 42 is fixed to the upper end of the pressure plate 41, and a mounting hole is opened at the horizontal end of the L-shaped plate 42. The mounting hole and the threaded hole are coaxially distributed, and a fastening bolt is threadedly connected between the mounting hole and the threaded hole. The pressure plate 41 is assembled between the L-shaped plate 42 and the mounting plate 23, so that the pressure plate 41 is pressed on the side wall of the rotating shaft 22 and rotates to fit with the upper side wall of the rotating shaft 22 to prevent the rotating shaft 22 from escaping from the U-shaped bayonet.

[0029] Moreover, a tapered embedding end capable of being inserted into the guide hole is provided on the side wall of the valve disc 3 facing the guide hole. By providing the tapered embedding end, a guide slope is formed to reduce the impact force of the fluid flushing the valve disc 3.

[0030] Furthermore, an assembly block 31 is fixed on the side wall of the valve disc 3 facing the outlet, and a plug-in slot plugged into the end of the flip rod 21 is provided on the upper side wall of the assembly block 31, and a threaded slot connected to the plug-in slot is provided on the side wall of the assembly block 31 facing the outlet. A limited hole is provided at the end of the flip rod 21, and a positioning bolt is threadedly connected in the threaded slot. The end of the positioning bolt extends into the limiting hole. The flip rod 21 and the valve disc 3 are assembled and spliced, and the end of the flip rod 21 is inserted into the plug-in slot, and then the positioning bolt is screwed into the threaded slot, and the end of the positioning bolt is inserted into the limiting hole of the flip rod 21 to realize the assembly between the flip rod 21 and the valve disc 3. Of course, the side wall of the valve disc 3 and the flip rod 21 can also be directly welded.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A check valve, characterized in that: The valve body (1) comprises a valve body (1), one end of the valve body (1) is an inlet, and the other end is an outlet, a flow guide seat (13) is fixed on the inner wall of the end of the valve body (1) close to the inlet, the flow guide seat (13) is provided with a flow guide hole, a rotating seat (2) with a door-type structure is fixed on the upper end of the side wall of the end of the flow guide seat (13) facing the outlet, a U-shaped bayonet is provided on the upper end of the rotating seat (2), a rotating shaft (22) is rotatably connected in the U-shaped bayonet, a flip rod (21) is fixed to the rotating shaft (22) in the radial direction, and a valve flap (3) for sealing the flow guide hole is connected to the bottom end of the flip rod (21); A pressure plate (41) is detachably provided in the U-shaped bayonet and covers the upper end of the rotating shaft (22). The rotating shaft (22) is rotatably fitted with the bottom wall of the pressure plate (41). An elastic member (4) is fixed to the side wall of the pressure plate (41). The end of the elastic member (4) is bent and extends to the side wall of the flip rod (21) facing the outlet. The position of the end of the elastic member (4) relative to the side wall of the flip rod (21) facing the outlet is adjustable, so as to provide elastic potential energy for the flip rod (21) to drive the valve flap (3) to rotate and press against the side wall of the guide hole opening.

2. The check valve according to claim 1, characterized in that: The upper end of the valve body (1) is connected to a mounting end (11) which is in communication with the interior of the valve body (1), and the opening of the mounting end (11) is threadedly connected to a valve cover (12).

3. The check valve according to claim 2, characterized in that: A mounting plate (23) is fixed to the inner wall of the rotating seat (2), a threaded hole is provided on the mounting plate (23), an L-shaped plate (42) is fixed to the upper end of the pressing plate (41), a mounting hole is provided at the horizontal end of the L-shaped plate (42), the mounting hole and the threaded hole are coaxially distributed, and a fastening bolt is threadedly connected between the mounting hole and the threaded hole.

4. The check valve according to claim 1, characterized in that: The elastic member (4) is a stainless steel spring sheet bent toward the outlet side.

5. The check valve according to claim 4, characterized in that: A limiting tooth groove is provided on the side wall of the flip rod (21) facing the outlet, and a conical clamping block is provided at the end of the stainless steel spring sheet, and the conical clamping block is clamped with the limiting tooth groove.

6. The check valve according to claim 4, characterized in that: A plurality of columnar-structured clamping seats (24) are provided on the side wall of the flip rod (21) facing the outlet, and a C-shaped clamping buckle capable of being clamped on the outer wall of the clamping seat (24) is provided at the end of the stainless steel spring sheet.

7. The check valve according to claim 5 or 6, characterized in that: The side wall of the valve flap (3) facing the flow guide hole is provided with a tapered embedding end capable of being inserted into the flow guide hole.

8. The check valve according to claim 5 or 6, characterized in that: An assembly block (31) is fixed on a side wall of the valve flap (3) facing the outlet, a plug-in slot for plugging into the end of the flip rod (21) is provided on the upper side wall of the assembly block (31), a threaded slot connected to the plug-in slot is provided on the side wall of the assembly block (31) facing the outlet, a limiting hole is provided on the end of the flip rod (21), a positioning bolt is threadedly connected in the threaded slot, and the end of the positioning bolt extends into the limiting hole.

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