Double-clack type check valve

Abstract

The utility model relates to the technical field of check valves, and discloses a double-clack type check valve which comprises a valve body, a pin shaft, a first valve clack, a second valve clack and a damping structure. Fluid flows into the valve body through a fluid inlet of the valve seat, the first valve clack and the second valve clack are opened under the action of fluid pressure, the fluid enters the damping groove through the first overflow hole, and the first end of the damping structure extends out of the damping groove. When the valve is closed, the first valve clack and the second valve clack are reset, and the valve clacks are about to make contact with the valve seat, the outer edges of the first valve clack and the second valve clack make contact with the first end of the damping structure firstly, and then the sealing faces are gradually attached to the valve seat to achieve sealing. By arranging the damping structure, the closing speed of the valve can be effectively slowed down, impact force generated when the valve is closed is reduced, therefore, sealing faces of the valve seat and the valve clack are effectively prevented from being damaged, the sealing effect of the valve can be guaranteed, noise of the valve can be reduced, meanwhile, the closing speed of the valve is slowed down, and the water hammer effect of the valve can be effectively reduced.

Description

Technical Field

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

[0002] The double-flap check valve is a common check valve with low flow resistance and fast opening and closing. However, due to the fast closing speed of the double-flap check valve, the sealing surface of the valve disc and the valve body is subjected to a large impact, which can easily cause damage to the sealing surface and lead to failure of the valve body seal. Utility Model Content

[0003] In view of this, the utility model provides a double-flap check valve to solve the problem in the prior art that the sealing surface of the double-flap check valve is subjected to a large impact when closing, which easily leads to damage to the sealing surface.

[0004] In a first aspect, the utility model provides a double-flap check valve, comprising:

[0005] A valve body, an annular protrusion is provided inside the valve body, and a valve seat is provided at the end of the annular protrusion; a damping groove is provided on the valve body, and the damping groove is located radially outside the annular protrusion; the valve body is provided with a flow channel connecting the valve body and the first overflow hole of the damping groove;

[0006] A pin shaft is mounted on the valve body;

[0007] A first valve flap and a second valve flap are rotatably arranged on the pin shaft, and a sealing surface is arranged on the circumferential outer edges of the first valve flap and the second valve flap;

[0008] A damping structure is arranged in the damping groove; when the valve is open, the first valve flap and the second valve flap are separated from the valve seat, and the damping structure extends out of the damping groove toward the first end of the notch of the damping groove; when the valve is closed, the first valve flap and the second valve flap rotate toward the valve seat, the first valve flap and the second valve flap first contact the first end of the damping structure, and gradually press the first end of the damping structure toward the damping groove, so that the sealing surfaces of the first valve flap and the second valve flap abut against the valve seat.

[0009] Beneficial effects: In the double-flap check valve of this structure, the fluid flows into the valve body through the fluid inlet of the valve seat. Under the action of the fluid pressure, the first valve flap and the second valve flap open, and the fluid enters the damping groove through the first overflow hole, and the first end of the damping structure extends out of the damping groove; when the valve is closed, when the first valve flap and the second valve flap are reset, when the valve flap is about to contact the valve seat, the outer edges of the first valve flap and the second valve flap first contact the first end of the damping structure, and then the sealing surface gradually fits on the valve seat to achieve sealing. By setting up the damping structure, the closing speed of the valve can be effectively slowed down, and the impact force when the valve is closed can be reduced, thereby effectively preventing the sealing surface of the valve seat and the valve flap from being damaged, ensuring the sealing effect of the valve, and reducing the valve noise. At the same time, the closing speed of the valve is slowed down, which can also effectively reduce the water hammer effect of the valve.

[0010] In an optional embodiment, the damping structure includes a moving part and an elastic part, wherein a receiving groove is provided on one side of the moving part facing the bottom of the damping groove, one side of the elastic part is provided in the receiving groove, and the other side of the elastic part abuts against the valve body; the elastic part applies a biasing force to the moving part to move toward the outside of the damping groove.

[0011] Beneficial effects: The damping structure is simple and reliable, and by arranging the elastic member, the moving member can be automatically reset when the valve is opened.

[0012] In an optional embodiment, the elastic member includes a spring.

[0013] In an optional embodiment, the damping structure also includes a guide member, which is arranged in the damping groove, and a second overflow hole and a guide hole are provided on the guide member. The movable member is slidably connected to the damping groove on the side of the bottom of the damping groove, and the movable member is provided with a reduced diameter section on the side of the opening of the damping groove, and the reduced diameter section is slidably arranged in the guide hole.

[0014] Beneficial effect: During the movement of the moving part, the side of the moving part facing the bottom of the damping groove slides relative to the groove wall of the damping groove, and the reduced diameter section slides along the guide hole to guide the moving part to move smoothly, ensuring the buffering effect when the valve disc is closed. During the process of the valve disc pressing the moving part, the fluid in the damping groove overflows from the first overflow hole and the second overflow hole at the same time. The guide member is blocked at the notch of the damping groove. Under the action of the spring, when the moving part on the inner side of the reduced diameter section abuts against the guide member, the moving part stops moving, and the guide member also plays a limiting role to prevent the moving part from escaping from the damping groove.

[0015] In an optional embodiment, the guide member is threadedly connected to a notch of the damping groove.

[0016] Beneficial effects: The guide piece is threadedly connected to the notch of the damping groove so that the guide piece can be detachably connected to the valve body, which facilitates the disassembly and replacement of the damping structure.

[0017] In an optional implementation, the second overflow holes are provided on both sides of the guide hole.

[0018] In an optional embodiment, it also includes a stop shaft, which is installed on the valve body and located on the side of the pin shaft facing the fluid outlet of the valve body; the first valve flap and the second valve flap are both provided with a boss portion on the side facing the fluid outlet, and when the valve is fully opened, the boss portions of the first valve flap and the second valve flap abut against each other and form an accommodating space, and the stop shaft is located in the accommodating space.

[0019] In an optional embodiment, it further includes an elastic buffer, which is arranged on the first valve flap and / or the second valve flap, and covers the outside of the boss portion.

[0020] Beneficial effect: When the valve is open, under the impact force of the medium, the elastic buffers on the two valve discs contact first, or the elastic buffer on one valve disc contacts the other valve disc first, so as to absorb vibration and reduce noise, and avoid direct collision between the two bosses.

[0021] In an optional embodiment, the elastic buffer component includes a spring sheet, and the spring sheet is spaced apart from the boss portion.

[0022] In an optional implementation, the spring piece is welded to the first valve flap and / or the second valve flap.

[0023] Beneficial effect: The spring piece is firmly fixed and will not fall off when the valve disc hits, thus ensuring the buffering and vibration absorbing effect time of the spring piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A cross-sectional view of a double-flap check valve according to an embodiment of the utility model;

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 for Figure 2 A partial enlarged view of the valve in the middle C section when it is close to the switch;

[0028] Figure 4 for Figure 2 The partial enlarged view of the valve in the middle C after it is closed;

[0029] Figure 5 for Figure 1 Cross-sectional view along the BB direction;

[0030] Figure 6 A first angle cross-sectional view of a valve body in a double-flap check valve according to an embodiment of the utility model;

[0031] Figure 7 This is a second angle cross-sectional view of a valve body in a double-flap check valve according to an embodiment of the utility model.

[0032] Description of reference numerals:

[0033] 1. Valve body; 101. annular protrusion; 102. valve seat; 103. damping groove; 104. first overflow hole; 2. pin shaft; 3. first valve flap; 4. second valve flap; 341. boss portion; 501. moving part; 502. elastic part, 503. guide part; 5031. second overflow hole; 6. stop shaft; 7. elastic buffer part; 8. support seat; 9. torsion spring; 10. bolt. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0035] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0036] According to an embodiment of the utility model, on one hand, a double-flap check valve is provided, comprising a valve body 1, a pin 2, a first valve flap 3, a second valve flap 4 and a damping structure.

[0037] The valve body 1 is provided with an annular protrusion 101 inside, and a valve seat 102 is provided at the end of the annular protrusion 101; the valve body 1 is provided with a damping groove 103, and the damping groove 103 is located radially outside the annular protrusion 101, and the valve body 1 is provided with a first overflow hole 104 connecting the flow channel of the valve body 1 and the damping groove 103; the pin shaft 2 is installed on the valve body 1; the first valve flap 3 and the second valve flap 4 are rotatably arranged on the pin shaft 2, and the circumferential outer edges of the first valve flap 3 and the second valve flap 4 are provided with sealing surfaces; the damping The structure is arranged in the damping groove 103; when the valve is open, the first valve flap 3 and the second valve flap 4 are separated from the valve seat 102, and the damping structure extends out of the damping groove 103 toward the first end of the notch of the damping groove 103; when the valve is closed, the first valve flap 3 and the second valve flap 4 rotate toward the valve seat 102, and the first valve flap 3 and the second valve flap 4 first contact the first end of the damping structure, and gradually press the first end of the damping structure toward the damping groove 103, so that the sealing surfaces of the first valve flap 3 and the second valve flap 4 fit on the valve seat 102.

[0038] In the double-flap check valve of this structure, the fluid flows into the valve body 1 through the fluid inlet of the valve seat 102. Under the action of the fluid pressure, the first valve flap 3 and the second valve flap 4 open, and the fluid enters the damping groove 103 through the first overflow hole 104. The first end of the damping structure extends out of the damping groove 103. When the valve is closed, when the first valve flap 3 and the second valve flap 4 are reset, when the valve flap is about to contact the valve seat 102, the outer edges of the first valve flap 3 and the second valve flap 4 first contact the first end of the damping structure, and the sealing surface gradually fits on the valve seat 102 to achieve sealing. By setting the damping structure, the closing speed of the valve can be effectively slowed down, and the impact force when the valve is closed can be reduced, thereby effectively preventing the sealing surface of the valve seat 102 and the valve flap from being damaged, ensuring the sealing effect of the valve, and reducing the valve noise. At the same time, the closing speed of the valve is slowed down, which can also effectively reduce the water hammer effect of the valve.

[0039] Optionally, in some embodiments, Figures 2 to 4As shown, the damping structure includes a moving member 501 and an elastic member 502. The moving member 501 is provided with a receiving groove on one side of the groove bottom facing the damping groove 103. One side of the elastic member 502 is provided in the receiving groove, and the other side of the elastic member 502 abuts against the valve body 1. The elastic member 502 applies a biasing force to the moving member 501 to move toward the outside of the damping groove 103. When the valve is opened, the sealing surface of the valve disc is separated from the moving member 501. Under the action of the elastic member 502, the moving member 501 moves toward the outside of the damping groove 103, and the first end of the notch of the moving member 501 toward the damping groove 103 extends out of the damping groove 103. When the valve is closed, the first valve disc 3 and the second valve disc 4 are reset, and the outer edge of the valve disc first contacts the first end of the moving member 501. The valve disc continues to close, and the moving member 501 is gradually pressed toward the damping groove 103. The sealing surfaces of the two valve discs are attached to the sealing surface of the valve seat 102 to achieve sealing. When the valve disc presses the moving member 501, the fluid in the damping groove 103 flows out to the inner cavity of the valve body 1 through the first overflow hole 104. The damping structure is simple and reliable, and by providing the elastic member 502, the moving member 501 can be automatically reset when the valve is opened.

[0040] Optionally, in some embodiments, the elastic member 502 includes a spring.

[0041] In some embodiments, Figure 3 and Figure 4 As shown, the damping structure also includes a guide member 503, the guide member 503 is arranged in the damping groove 103, the guide member 503 is provided with a second overflow hole 5031 and a guide hole, the moving member 501 is slidably connected with the damping groove 103 on one side of the groove bottom of the damping groove 103, and the moving member 501 is provided with a reduced diameter section on one side of the opening of the damping groove 103, and the reduced diameter section is slidably arranged in the guide hole. During the movement of the moving member 501, the moving member 501 slides relative to the groove wall of the damping groove 103 on one side of the groove bottom of the damping groove 103, and the reduced diameter section slides along the guide hole to guide the moving member 501 to move smoothly, so as to ensure the buffering effect when the valve flap is closed. During the process of the valve flap pressing the moving member 501, the fluid in the damping groove 103 overflows from the first overflow hole 104 and the second overflow hole 5031 at the same time. The guide member 503 is blocked at the notch of the damping groove 103. Under the action of the spring, when the moving member 501 on the inner side of the reduced diameter section abuts against the guide member 503 , the moving member 501 stops moving, and the guide member 503 also plays a limiting role to prevent the moving member 501 from escaping from the damping groove 103 .

[0042] Optionally, in some embodiments, the guide member 503 is threadedly connected to the notch of the damping groove 103 so that the guide member 503 is detachably connected to the valve body 1, which facilitates the disassembly and replacement of the damping structure.

[0043] like Figure 3 and Figure 4As shown, second overflow holes 5031 are provided on both sides of the guide hole, so that the fluid between the moving member 501 and the guide member 503 can flow out evenly from the second overflow holes 5031 on both sides of the reduced diameter section, ensuring the smooth movement of the moving member 501.

[0044] like Figure 2 As shown, in some embodiments, two damping grooves 103 are provided, and the cross section of the damping groove 103 parallel to the groove direction thereof is circular, and the outer peripheral walls of the moving member 501 and the guide member 503 are both arc surfaces. The damping structure is arranged in the two damping grooves 103 in a one-to-one correspondence, and when the valve is closed, the first valve flap 3 first contacts the first end of the moving member 501 on one side, and the second valve flap 4 contacts the first end of the moving member 501 on the other side.

[0045] like Figure 3 and Figure 4 As shown, the first overflow hole 104 is connected to the bottom of the damping groove 103 so that the fluid between the accommodating groove and the bottom of the damping groove 103 can overflow and flow out.

[0046] like Figure 3 and Figure 5 As shown, the double-flap check valve also includes a stopper shaft 6, which is mounted on the valve body 1 and located on the side of the pin shaft 2 facing the fluid outlet of the valve body 1; the first valve flap 3 and the second valve flap 4 are both provided with a boss portion 341 on the side facing the fluid outlet, and when the valve is fully opened, the boss portions 341 of the first valve flap 3 and the second valve flap 4 abut against each other and form an accommodation space, and the stopper shaft 6 is located in the accommodation space. The stopper shaft 6 is used to limit the rotation angle of the first valve flap 3 and the second valve flap 4, and to limit the first valve flap 3 and the second valve flap 4 when the valve is fully opened. The accommodation space formed by the abutment between the boss portions 341 of the first valve flap 3 and the second valve flap 4 can accommodate the stopper shaft 6 in the accommodation space.

[0047] When the valve is open, due to the unstable flow rate of the medium, the bosses 341 of the first valve flap 3 and the second valve flap 4 frequently collide, generating a large noise. In order to solve this problem, the double-flap check valve of the present application also includes an elastic buffer 7, which is arranged on the first valve flap 3 and / or the second valve flap 4, and the elastic buffer 7 covers the outside of the boss 341. When the valve is open, under the impact force of the medium, the elastic buffers 7 on the two valve flaps contact first, or the elastic buffer 7 on one valve flap contacts the other valve flap first, so as to absorb vibration and reduce noise, and avoid direct collision between the two bosses 341.

[0048] Optionally, in some embodiments, Figure 2As shown, elastic buffer members 7 are provided on the first valve flap 3 and the second valve flap 4. When the valve is opened, under the action of unstable fluid medium, the protrusions of the first valve flap 3 and the second valve flap 4 collide with each other. During the collision, the two elastic buffer members 7 contact each other first, so as to play an effective role in buffering and absorbing vibration.

[0049] like Figure 2 As shown, the elastic buffer 7 includes a spring sheet, which is spaced apart from the boss portion 341. When the first valve flap 3 and the second valve flap 4 collide, the two spring sheets first contact and are pressed against the valve flaps. The elastic buffer 7 has a simple structure and good vibration absorption and noise reduction effects.

[0050] The spring sheet area spaced apart from the protruding portion completely covers the protruding portion, thereby preventing the two protruding portions from directly contacting each other and generating loud noise when the two valve flaps collide with each other.

[0051] Alternatively, if Figure 2 As shown, one side of the spring sheet is fixed on the valve disc inside the protrusion, and the other side of the spring sheet extends outside the protrusion and is spaced apart from the protrusion. The gap between the spring sheet spaced apart from the protrusion and the protrusion is 3mm-5mm.

[0052] Optionally, in some embodiments, the material of the spring includes spring steel.

[0053] Optionally, in some embodiments, the spring pieces are welded to the first valve flap 3 and the second valve flap 4, the spring pieces are firmly fixed, and will not fall off when the valve flaps collide, thereby ensuring the buffering and vibration absorbing effect time of the spring pieces.

[0054] like Figure 1 , Figure 2 and Figure 5 As shown, the double-flap check valve further includes a support seat 8, a torsion spring 9 and a bolt 10. The support seat 8 is fixed to the valve body 1 by the bolt 10, and the pin 2 and the stop shaft 6 are fixed to the support seat 8. The torsion spring 9 is sleeved on the pin 2, one end of the torsion spring 9 abuts against the first valve flap 3, and the other end of the torsion spring 9 abuts against the second valve flap 4.

[0055] In the valve closed state, the sealing surfaces of the first valve flap 3 and the second valve flap 4 are attached to the valve seat 102 to achieve sealing. Fluid medium enters from the fluid inlet of the valve. Under the action of the medium pressure, the first valve flap 3 and the second valve flap 4 gradually open to overcome the pressure of the torsion spring 9. In the fully open state, the two valve flaps will collide frequently due to the instability of the medium. When the valve flaps collide, the springs on the two valve flaps first contact to play a role in buffering, vibration absorption and noise reduction. When the valve is opened, the first end of the moving member 501 extends out of the damping groove 103 under the action of the spring, and the flow inlet direction of the valve body 1 stops entering the fluid. Under the action of the torsion spring 9, the first valve flap 3 and the second valve flap 4 are reset. The first valve flap 3 and the second valve flap 4 first contact the first end of the moving member 501, and the valve flap gradually presses the moving member 501, and the moving member 501 moves to the inside of the damping groove 103. The sealing surfaces of the first valve flap 3 and the second valve flap 4 gradually fit on the valve seat 102 to delay the closing speed of the valve and reduce impact and noise.

[0056] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A double-flap check valve, characterized in that: include: A valve body (1), an annular protrusion (101) is provided inside the valve body, and a valve seat (102) is provided at the end of the annular protrusion (101); a damping groove (103) is provided on the valve body (1), and the damping groove (103) is located radially outside the annular protrusion (101); and a first overflow hole (104) is provided on the valve body (1) for connecting a flow channel of the valve body (1) and the damping groove (103); A pin shaft (2) is mounted on the valve body (1); A first valve flap (3) and a second valve flap (4) are rotatably arranged on the pin shaft (2), and a sealing surface is arranged on the circumferential outer edges of the first valve flap (3) and the second valve flap (4); A damping structure is arranged in the damping groove (103); when the valve is in an open state, the first valve flap (3) and the second valve flap (4) are separated from the valve seat (102), and the damping structure extends out of the damping groove (103) toward the first end of the notch of the damping groove (103); when the valve is closed, the first valve flap (3) and the second valve flap (4) rotate toward the valve seat (102), and the first valve flap (3) and the second valve flap (4) first contact the first end of the damping structure, and gradually press the first end of the damping structure toward the damping groove (103), so that the sealing surfaces of the first valve flap (3) and the second valve flap (4) abut against the valve seat (102).

2. The double-flap check valve according to claim 1, characterized in that: The damping structure comprises a moving part (501) and an elastic part (502); a receiving groove is provided on one side of the moving part (501) facing the bottom of the damping groove (103); one side of the elastic part (502) is arranged in the receiving groove, and the other side of the elastic part (502) abuts against the valve body (1); the elastic part (502) applies a biasing force to the moving part (501) to move toward the outside of the damping groove (103).

3. The double-flap check valve according to claim 2, characterized in that: The elastic member (502) comprises a spring.

4. The double-flap check valve according to claim 2 or 3, characterized in that: The damping structure further comprises a guide member (503), wherein the guide member (503) is arranged in the damping groove (103), and a second overflow hole (5031) and a guide hole are provided on the guide member (503); the side of the movable member (501) facing the bottom of the damping groove (103) is slidably connected to the damping groove (103); the side of the movable member (501) facing the opening of the damping groove (103) is provided with a reduced diameter section, and the reduced diameter section is slidably arranged in the guide hole.

5. The double-flap check valve according to claim 4, characterized in that: The guide member (503) is threadedly connected at the notch of the damping groove (103).

6. The double-flap check valve according to claim 4, characterized in that: The second overflow holes (5031) are provided on both sides of the guide hole.

7. The double-flap check valve according to any one of claims 1 to 3, characterized in that: It also includes a stop shaft (6), which is installed on the valve body (1) and is located on the side of the pin shaft (2) facing the fluid outlet of the valve body (1); the first valve flap (3) and the second valve flap (4) are both provided with a boss portion (341) on the side facing the fluid outlet, and when the valve is fully opened, the boss portions (341) of the first valve flap (3) and the second valve flap (4) abut against each other to form a receiving space, and the stop shaft (6) is located in the receiving space.

8. The double-flap check valve according to claim 7, characterized in that: It also comprises an elastic buffer (7), wherein the elastic buffer (7) is arranged on the first valve flap (3) and / or the second valve flap (4), and the elastic buffer (7) covers the outside of the boss portion (341).

9. The double-flap check valve according to claim 8, characterized in that: The elastic buffer (7) comprises a spring sheet, and the spring sheet is spaced apart from the boss portion (341).

10. The double-flap check valve according to claim 9, characterized in that: The spring sheet is welded to the first valve flap (3) and / or the second valve flap (4).

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