Slow-closing type check valve

Abstract

The utility model relates to the technical field of valves, and discloses a slow closing type check valve which comprises a valve body, a valve seat, a valve clack and a flow guide channel. The valve seat comprises a first step structure and a first sealing face arranged on the inner ring of the first step structure. The valve clack is movably arranged in the flow channel cavity of the valve body and comprises a second step structure and a second sealing face arranged on the inner ring of the second step structure. The second sealing surface is suitable for being matched with the first sealing surface; in the closing process of the slowly-closed check valve, a volume cavity is formed between the first step structure and the second step structure; before the first sealing face abuts against the second sealing face, the volume cavity is communicated with the flow channel cavity through the flow guide channel. When the first circular bead abuts against the second circular bead, the first sealing face and the second sealing face are tightly attached, and the flow channel cavity is blocked. The valve clack can be slowly closed, impact between the valve clack and the valve seat is reduced, the sealing life of the valve is prolonged, and the water hammer effect is reduced.

Description

Technical Field

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

[0002] The axial flow check valve determines the opening and closing of the valve disc by the pressure difference between the inlet and outlet of the valve. When the inlet pressure is greater than the sum of the outlet pressure and the spring force, the valve disc opens. As long as there is a pressure difference, the valve disc is always in the open state, but the opening degree is determined by the size of the pressure difference. When the sum of the outlet pressure and the spring force is greater than the inlet pressure, the valve disc closes and remains in the closed state. Since the opening and closing of the valve disc is in a dynamic force balance system, the valve runs smoothly and without noise.

[0003] Another important feature of the axial flow check valve is its small flow resistance and fast closing speed.

[0004] However, the problem brought about by this feature is that the valve disc and the valve seat collide severely, affecting its sealing life. At the same time, rapid closing will produce a water hammer effect. Utility Model Content

[0005] In view of this, the utility model provides a slow-closing check valve to solve the problems of fast closing speed of the check valve, collision between the valve disc and the valve seat, affecting the service life and generating water hammer effect.

[0006] In the first aspect, the utility model provides a slow-closing check valve, including a valve body, a valve seat, a valve disc and a guide channel; the valve body has a flow channel cavity; the valve seat is connected to the inner wall of the valve body, the valve seat includes a first step structure and a first sealing surface arranged on the inner ring of the first step structure; the first step structure includes a first shoulder extending radially; the valve disc is movably arranged in the flow channel cavity of the valve body, the valve disc includes a second step structure and a second sealing surface arranged on the inner ring of the second step structure; the second step structure includes a second shoulder extending radially, the second shoulder is suitable for cooperating with the first shoulder, and the second sealing surface is suitable for cooperating with the first sealing surface; in the process of closing the slow-closing check valve, a volume cavity is formed between the first step structure and the second step structure; before the first sealing surface and the second sealing surface abut, the volume cavity is connected with the flow channel cavity through the guide channel; when the first shoulder and the second shoulder abut, the first sealing surface and the second sealing surface are tightly fitted to block the flow channel cavity.

[0007] Beneficial effects: The slow-closing check valve provided by the utility model has a first step structure on the valve body and a second step structure on the valve disc, and the first step structure and the second step structure can cooperate with each other, so that the valve seat and the valve disc form a medium volume cavity when the valve is close to closing. In addition, because the slow-closing check valve is provided with a guide channel, the guide channel can connect the volume cavity and the flow channel cavity, so that when the valve disc continues to close, the medium in the volume cavity overflows through the guide channel, thereby playing a slow closing role, reducing the impact of the valve disc and the valve seat, extending the sealing life of the valve, and reducing the water hammer effect.

[0008] In an optional embodiment, the guide channel includes a guide hole provided in the second step structure, and the guide hole axially penetrates the second shoulder of the second step structure.

[0009] In an optional embodiment, the volume cavity is an annular cavity, and a plurality of guide holes are arranged at intervals along the circumference of the second shoulder.

[0010] In an optional implementation, the ratio of the diameter of the flow guide hole to the radial width of the volume cavity is 40% to 60%.

[0011] In an optional embodiment, the first step structure includes a first inner peripheral surface of the outer ring connected to the first shoulder and a second inner peripheral surface of the inner ring connected to the first shoulder; the second step structure includes a first outer peripheral surface of the outer ring connected to the second shoulder and a second outer peripheral surface of the inner ring connected to the second shoulder;

[0012] The second inner peripheral surface abuts against the second outer peripheral surface, and the flow guide channel includes a gap between the first inner peripheral surface and the first outer peripheral surface;

[0013] Alternatively, the first inner circumferential surface abuts against the first outer circumferential surface, and the flow guide channel includes a gap provided between the second inner circumferential surface and the second outer circumferential surface.

[0014] In an optional embodiment, the width of the gap along the radial direction is 1 mm to 2 mm, and the width of the gap does not exceed 20% of the width of the volume cavity along the radial direction.

[0015] In an optional embodiment, the first step structure includes a first inner circumferential surface connected to the outer ring of the first shoulder, a conical guide surface, and a front end surface facing the second step structure, the outer ring of the guide surface is connected to the front end surface of the second step structure, the inner ring of the guide surface is connected to the first inner circumferential surface, and the guide surface is used to guide the valve disc to move toward the center of the valve seat.

[0016] In an optional implementation, the angle between the generatrix of the guide surface and the axis of the valve seat is 15° to 20°.

[0017] In an optional embodiment, it further includes a support frame and an elastic member; one end of the elastic member abuts against the valve disc, and the other end of the elastic member abuts against the support frame, and the elastic member is suitable for applying an elastic force to the valve disc toward the valve seat.

[0018] In an optional embodiment, on the mating surface between the support frame and the valve disc, the support frame is provided with a first limiting structure, and the valve disc is provided with a second limiting structure cooperating with the first limiting structure. When the slow-closing check valve is in an open state, the first limiting structure and the second limiting structure abut against each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A cross-sectional view of the first slow-closing check valve according to an embodiment of the utility model along the axial direction;

[0021] Figure 2 for Figure 1 A partial enlarged view of the valve seat and valve disc in the first state;

[0022] Figure 3 is a partial enlarged view of the valve seat and the valve disc in the second state;

[0023] Figure 4 It is a partial enlarged view of the valve seat and the valve disc in the third state;

[0024] Figure 5 It is a partial enlarged view of the valve seat and valve disc of the second slow-closing check valve of the embodiment of the utility model;

[0025] Figure 6 It is a partial enlarged view of the valve seat and valve disc of the third slow-closing check valve in the embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 1. Valve body; 11. Flow channel cavity; 2. Valve seat; 21. First step structure; 211. First shoulder; 212. First inner peripheral surface; 213. Second inner peripheral surface; 214. Guide surface; 22. First sealing surface; 3. Valve flap; 31. Second step structure; 311. Second shoulder; 312. First outer peripheral surface; 313. Second outer peripheral surface; 32. Second sealing surface; 33. Second limiting structure; 4. Guide channel; 5. Volume cavity; 6. Support frame; 61. First limiting structure; 7. Elastic member; 8. Connecting shaft; 9. Pin. DETAILED DESCRIPTION

[0028] 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.

[0029] Combine the following Figures 1 to 6 , describing an embodiment of the utility model.

[0030] According to an embodiment of the utility model, on the one hand, a slow-closing check valve is provided, comprising a valve body 1, a valve seat 2, a valve disc 3 and a guide channel 4; the valve body 1 has a flow channel cavity 11; the valve seat 2 is connected to the inner wall of the valve body 1, the valve seat 2 comprises a first step structure 21 and a first sealing surface 22 arranged on the inner ring of the first step structure 21; the first step structure 21 comprises a first shoulder 211 extending in the radial direction; the valve disc 3 is movably arranged in the flow channel cavity 11 of the valve body 1, the valve disc 3 comprises a second step structure 31 and a second sealing surface 32 arranged on the inner ring of the second step structure 31; the second ... The step structure 31 includes a second shoulder 311 extending radially, the second shoulder 311 is suitable for cooperating with the first shoulder 211, and the second sealing surface 32 is suitable for cooperating with the first sealing surface 22; during the closing process of the slow-closing check valve, a volume cavity 5 is formed between the first step structure 21 and the second step structure 31; before the first sealing surface 22 and the second sealing surface 32 abut, the volume cavity 5 is connected through the guide channel 4 and the flow channel cavity 11; when the first shoulder 211 and the second shoulder 311 abut, the first sealing surface 22 and the second sealing surface 32 fit tightly to block the flow channel cavity 11.

[0031] The movement of the valve flap 3 close to the valve body 1 is the closing process of the slow-closing check valve, and the movement of the valve flap 3 away from the valve body 1 is the opening process of the slow-closing check valve. The slow-closing check valve provided by the embodiment of the utility model has a first step structure 21 provided on the valve body 1 and a second step structure 31 provided on the valve flap 3. The first step structure 21 and the second step structure 31 can cooperate with each other, and the valve seat 2 and the valve flap 3 form a medium volume chamber 5 when the valve is close to closing. In addition, because the slow-closing check valve is provided with a guide channel 4, the guide channel 4 can connect the volume chamber 5 with the flow channel chamber 11. In this way, when the valve flap 3 continues to close, the medium in the volume chamber 5 overflows through the guide channel 4, thereby playing a slow closing role, reducing the impact between the valve flap 3 and the valve seat 2, extending the sealing life of the valve, and reducing the water hammer effect.

[0032] Specifically, the first sealing surface 22 is an inwardly concave arc surface, and the second sealing surface 32 is an outwardly convex arc surface.

[0033] In some embodiments, the guide channel 4 includes a guide hole disposed on the second step structure 31 , and the guide hole axially penetrates the second shoulder 311 of the second step structure 31 .

[0034] By setting the guide hole on the second step structure 31, the guide hole can form a guide channel 4, connecting the volume chamber 5 and the flow channel chamber 11. When the valve flap 3 continues to close, the medium in the volume chamber 5 overflows through the guide channel 4, thereby playing a role in slow closing of the valve flap 3, reducing the impact between the valve flap 3 and the valve seat 2, extending the sealing life of the valve, and reducing the water hammer effect. Figures 2 to 4 , which shows the structural position relationship between the valve disc and the valve seat during the closing process.

[0035] In some embodiments, the volume cavity 5 is an annular cavity, and a plurality of guide holes are arranged at intervals along the circumference of the second shoulder 311 .

[0036] With such arrangement, the medium in the volume chamber 5 overflows through the plurality of guide holes in the circumferential direction, which can improve the stability of the movement of the valve flap 3 .

[0037] In some embodiments, the ratio of the diameter of the flow guide hole to the radial width of the volume cavity 5 is 40% to 60%.

[0038] Such an arrangement can control the diameter of the guide hole within a reasonable range and can play a guiding role.

[0039] In some embodiments, the first step structure 21 includes a first inner circumferential surface 212 of the outer ring connected to the first shoulder 211 and a second inner circumferential surface 213 of the inner ring connected to the first shoulder 211; the second step structure 31 includes a first outer circumferential surface 312 of the outer ring connected to the second shoulder 311 and a second outer circumferential surface 313 of the inner ring connected to the second shoulder 311;

[0040] Among them, the second inner circumferential surface 213 and the second outer circumferential surface 313 are abutted, and the guide channel 4 includes a gap arranged between the first inner circumferential surface 212 and the first outer circumferential surface 312; specifically, there is a fitting gap between the second inner circumferential surface 213 and the second outer circumferential surface 313, and the fitting gap is 0.1mm~0.2mm, which can be used for guiding the valve disc 3 and can be well centered; at the same time, the valve disc 3 and the valve seat 2 can form a volume cavity 5 to prevent the medium from quickly overflowing.

[0041] Or, the first inner circumferential surface 212 abuts against the first outer circumferential surface 312, and the flow guide channel 4 includes a gap between the second inner circumferential surface 213 and the second outer circumferential surface 313. Specifically, there is a matching gap between the first inner circumferential surface 212 and the first outer circumference, and the matching gap is 0.1mm-0.2mm. This arrangement can also be used for guiding the valve disc 3 and can be well centered; at the same time, the valve disc 3 and the valve seat 2 can form a volume cavity 5 to prevent the medium from quickly overflowing.

[0042] The guide channel 4 can also be the above two implementations. The gaps in the two implementations can constitute the guide channel 4, which plays a role in guiding the medium in the volume chamber 5, thereby playing a role in slow closing of the valve flap 3, reducing the impact between the valve flap 3 and the valve seat 2, extending the sealing life of the valve, and reducing the water hammer effect.

[0043] In some embodiments, the width of the gap along the radial direction is 1 mm to 2 mm, and the width of the gap does not exceed 20% of the width of the volume cavity 5 along the radial direction.

[0044] By controlling the width of the gap, it is possible to ensure that the gap is controlled within a reasonable range and can play a role in guiding flow without affecting the coordination between the first step structure 21 of the valve seat 2 and the second step structure 31 of the valve flap 3 .

[0045] In some embodiments, the first step structure 21 includes a first inner circumferential surface 212 connected to the outer ring of the first shoulder 211, a conical guide surface 214, and a front end surface facing the second step structure 31, the outer ring of the guide surface 214 is connected to the front end surface of the second step structure 31, the inner ring of the guide surface 214 is connected to the first inner circumferential surface 212, and the guide surface 214 is used to guide the valve disc 3 to move toward the center of the valve seat 2.

[0046] By providing the guide surface 214, when the valve is closed, the first step structure 21 of the valve flap 3 first enters the guide surface 214, and then continues to move along the guide surface 214, ensuring that the valve flap 3 and the valve seat 2 are absolutely aligned, achieving better fit and better sealing effect. Figure 2 In the state shown, the valve flap 3 enters the guide surface 214, and the valve flap 3 continues to move until Figure 3At the position shown in FIG. 1 , a volume cavity 5 is formed between the first step structure 21 and the second step structure 31; then, the valve flap 3 continues to move until it reaches Figure 4 In the position shown, the valve is completely closed, the first shoulder 211 of the first step structure 21 abuts against the second shoulder 311 of the second step structure 31, and the first sealing surface 22 and the second sealing surface 32 fit closely to block the flow channel cavity 11.

[0047] In some embodiments, the angle between the generatrix of the guide surface 214 and the axis of the valve seat 2 is 15° to 20°.

[0048] Such an arrangement can not only ensure the matching relationship between the first step structure 21 and the second step structure 31 , but also play a guiding role to ensure the centering effect of the valve flap 3 and the valve seat 2 during the closing process.

[0049] In some embodiments, the first outer peripheral surface 312 of the second step structure 31 and the second shoulder 311 are connected smoothly via rounded corners to prevent the valve flap 3 from being damaged by the valve seat 2 during the closing process.

[0050] In some embodiments, it also includes a support frame 6 and an elastic member 7; the valve flap 3 is arranged between the support frame 6 and the valve seat 2, and the valve flap 3 is movably connected to the support frame 6 through the elastic member 7; one end of the elastic member 7 abuts against the valve flap 3, and the other end of the elastic member 7 abuts against the support frame 6, and the elastic member 7 is suitable for applying an elastic force to the valve flap 3 toward the valve seat 2.

[0051] The elastic member 7 can provide a buffering and shock absorbing effect. When the medium flows downstream, the valve flap 3 opens, and the medium flows through the axial flow channel cavity of the valve body 1. When the medium pushes the valve flap 3, the spring plays a buffering effect, preventing the impact vibration between the valve flap 3 and the valve body 1 when the ordinary check valve is opened. When the medium flows in the reverse direction, the valve flap 3 is closed, and the valve flap 3 fits tightly with the valve seat 2 to prevent the medium from flowing in the reverse direction. Specifically, the support frame 6 is connected to the valve body 1 through the pin 9.

[0052] In some embodiments, the support frame 6 is provided with a sliding hole, and the slow-closing check valve further includes a connecting shaft 8, one end of the connecting shaft 8 is connected to the valve flap 3, and the other end of the connecting shaft 8 is slidably disposed in the sliding hole.

[0053] In this way, the sliding connection between the connecting shaft 8 and the sliding hole can guide the movement of the valve flap 3 and ensure the stability of the movement of the valve flap 3. The axis of the sliding hole is collinear with the axis of the valve seat 2.

[0054] In some embodiments, the elastic member 7 includes a spring, the support frame 6 is provided with a protruding limiting column, and the spring is sleeved outside the limiting column and the connecting shaft 8.

[0055] This arrangement can limit the spring, further ensuring the smooth movement of the valve flap 3 along the axial direction and the centering with the valve body 1.

[0056] In some embodiments, on the mating surface between the support frame 6 and the valve flap 3, the support frame 6 is provided with a first limiting structure 61, and the valve flap 3 is provided with a second limiting structure 33 cooperating with the first limiting structure 61. When the slow-closing check valve is in an open state, the first limiting structure 61 and the second limiting structure 33 are in contact with each other.

[0057] Through the abutment between the first limiting structure 61 and the second limiting structure 33 , the valve flap 3 and the support frame 6 abut against each other to limit the position during the opening of the valve flap 3 , thereby ensuring the maximum opening degree of the valve.

[0058] In some embodiments, the first limiting structure 61 includes a limiting protrusion or a limiting groove; the second limiting structure 33 includes a limiting groove or a limiting protrusion that cooperates with the first limiting structure 61.

[0059] 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 slow closing check valve, characterized in that: include: A valve body (1), wherein the valve body (1) has a flow channel cavity (11); A valve seat (2), the valve seat (2) being connected to the inner wall of the valve body (1), the valve seat (2) comprising a first step structure (21) and a first sealing surface (22) arranged on the inner ring of the first step structure (21); the first step structure (21) comprising a first shoulder (211) extending in the radial direction; A valve flap (3), the valve flap (3) being movably arranged in the flow channel cavity (11) of the valve body (1), the valve flap (3) comprising a second step structure (31) and a second sealing surface (32) arranged on the inner ring of the second step structure (31); the second step structure (31) comprising a second shoulder (311) extending in the radial direction, the second shoulder (311) being suitable for cooperating with the first shoulder (211), and the second sealing surface (32) being suitable for cooperating with the first sealing surface (22); A flow diversion channel (4); During the closing process of the slow-closing check valve, a volume chamber (5) is formed between the first step structure (21) and the second step structure (31); before the first sealing surface (22) and the second sealing surface (32) abut against each other, the volume chamber (5) is connected to the flow channel chamber (11) through the flow guide channel (4); When the first shoulder (211) and the second shoulder (311) are in contact, the first sealing surface (22) and the second sealing surface (32) are tightly fitted together, thereby blocking the flow channel cavity (11).

2. The slow closing check valve according to claim 1, characterized in that: The guide channel (4) comprises a guide hole provided on the second step structure (31), and the guide hole axially penetrates the second shoulder (311) of the second step structure (31).

3. The slow closing check valve according to claim 2, characterized in that: The volume cavity (5) is an annular cavity, and a plurality of guide holes are arranged at intervals along the circumference of the second shoulder (311).

4. The slow closing check valve according to claim 3, characterized in that: The ratio of the diameter of the flow guide hole to the width of the volume cavity (5) along the radial direction is 40% to 60%.

5. The slow closing check valve according to claim 1, characterized in that: The first step structure (21) includes a first inner circumferential surface (212) connected to the outer ring of the first shoulder (211) and a second inner circumferential surface (213) connected to the inner ring of the first shoulder (211); the second step structure (31) includes a first outer circumferential surface (312) connected to the outer ring of the second shoulder (311) and a second outer circumferential surface (313) connected to the inner ring of the second shoulder (311); The second inner peripheral surface (213) and the second outer peripheral surface (313) are in contact with each other, and the guide channel (4) includes a gap provided between the first inner peripheral surface (212) and the first outer peripheral surface (312); Alternatively, the first inner circumferential surface (212) and the first outer circumferential surface (312) are in contact with each other, and the flow guide channel (4) includes a gap provided between the second inner circumferential surface (213) and the second outer circumferential surface (313).

6. The slow closing check valve according to claim 5, characterized in that: The width of the gap along the radial direction is 1 mm to 2 mm, and the width of the gap does not exceed 20% of the width of the volume cavity (5) along the radial direction.

7. The slow closing check valve according to any one of claims 1 to 6, characterized in that: The first step structure (21) comprises a first inner circumferential surface (212) connected to the outer ring of the first shoulder (211), a conical guide surface (214) and a front end surface facing the second step structure (31); the outer ring of the guide surface (214) is connected to the front end surface of the second step structure (31); the inner ring of the guide surface (214) is connected to the first inner circumferential surface (212); and the guide surface (214) is used to guide the valve disc (3) to move toward the center of the valve seat (2).

8. The slow closing check valve according to claim 7, characterized in that: The included angle between the generatrix of the guide surface (214) and the axis of the valve seat (2) is 15° to 20°.

9. The slow closing check valve according to any one of claims 1 to 6, characterized in that: It also includes a support frame (6) and an elastic member (7); one end of the elastic member (7) abuts against the valve flap (3), and the other end of the elastic member (7) abuts against the support frame (6); the elastic member (7) is suitable for applying an elastic force to the valve flap (3) toward the valve seat (2).

10. The slow closing check valve according to claim 9, characterized in that: On the mating surface between the support frame (6) and the valve flap (3), the support frame (6) is provided with a first limiting structure (61), and the valve flap (3) is provided with a second limiting structure (33) cooperating with the first limiting structure (61); when the slow-closing check valve is in an open state, the first limiting structure (61) and the second limiting structure (33) are in abutment with each other.

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