Quick-closing check valve

Abstract

The utility model relates to the field of check valves, in particular to a quick-closing check valve which comprises a valve body, a shaft rod, a valve clack and a driving mechanism, the shaft rod is rotatably connected with the valve body, the valve clack is located in the valve body and fixedly connected with the shaft rod, and the driving mechanism comprises a heavy hammer, a supporting portion, a driven clutch structure and a driving clutch structure. One end of the heavy hammer is a rotating end rotationally connected with the shaft rod, the supporting part comprises a supporting piece used for supporting the heavy hammer and a power source used for driving the supporting piece to support and drive the heavy hammer to ascend or be away from the heavy hammer, the driven clutch structure is fixedly arranged on the shaft rod, and the driving clutch structure is fixed to the rotating end and matched with the driven clutch structure. The driving clutch structure and the driven clutch structure have rotation allowance in the circumferential direction of the shaft rod. The valve clack can be rapidly and reliably closed under the condition that an auxiliary power device fails or no shutdown signal exists, and the valve clack is forcibly opened under the condition that a medium is small, so that the valve clack is prevented from continuously colliding with the valve body.

Description

Technical Field

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

[0002] At present, most of the steam extraction and exhaust pipes use steam extraction check valves as special fast-closing valves to protect steam turbine generator sets. When the valve is working normally, the medium pressure pushes the valve disc to open, and when it is closed, the valve disc is closed under the action of its own weight and the medium. However, it was found during use that when the steam turbine is shut down due to an emergency failure, the steam extraction check valve cannot close the valve automatically when the auxiliary power unit fails or there is no shutdown signal, resulting in steam backflow into the steam turbine, affecting the operation of the steam turbine; in addition, when the power plant is started, the small flow rate of the steam extraction pipeline will cause the medium to be unable to stably open the valve disc, so that the valve disc hits the valve body and causes vibration, causing long-term damage to the valve disc and leakage of the valve.

[0003] Therefore, it is urgent to design a fast closing valve to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a fast-closing check valve, which can quickly and reliably close the valve disc when the auxiliary power device fails or there is no shutdown signal, and can force the valve disc to open when the medium is small, thereby preventing the valve disc from constantly colliding with the valve body and prolonging the service life of the valve.

[0005] In order to solve the above technical problems, the utility model provides a quick-closing check valve, including a valve body, a shaft, a valve flap and a driving mechanism, wherein the shaft is rotatably connected to the valve body, the valve flap is located in the valve body and fixedly connected to the shaft, the driving mechanism includes a weight, a support, a driven clutch structure and an active clutch structure, one end of the weight is a rotating end rotatably connected to the shaft, the support includes a support member for supporting the weight, and a power source for driving the support member to support and drive the weight to rise or move away from the weight;

[0006] The power source is mounted on the valve body, the driven clutch structure is fixed on the shaft, the active clutch structure is fixed on the rotating end and is matched with the driven clutch structure, and the active clutch structure and the driven clutch structure have a rotation margin in the circumferential direction of the shaft.

[0007] Furthermore, the rotating end has a rotating through hole, the rotating end is sleeved on the shaft rod, and has a rotating gap between the rotating end and the shaft rod, the active clutch structure is an arc fan-shaped groove arranged on the inner wall of the rotating through hole, and the driven clutch structure is a key arranged on the outer wall of the shaft rod, and the key rotates circumferentially along the inner wall of the arc fan-shaped groove.

[0008] Furthermore, a sleeve structure is fixedly installed at one end of the weight, and the sleeve structure includes a T-shaped sleeve, one end of the T-shaped sleeve is sleeved on the outside of the rod of the weight and fixedly connected therebetween, and the other end is a rotating end sleeved on the outside of the shaft and cooperates with the key.

[0009] Furthermore, the power source is a motor, and one side of the support member is fixedly connected to an output shaft of the motor.

[0010] Furthermore, the supporting member is a cam, the cam is fixedly sleeved on the output shaft of the motor and the outer wall of the cam is used to support the weight.

[0011] Furthermore, the output shaft and the shaft rod have an axial angle.

[0012] Furthermore, the output shaft is arranged perpendicular to the shaft rod.

[0013] Furthermore, the output shaft is arranged parallel to the shaft rod.

[0014] Furthermore, a boss is provided on the outer side of the valve body, and the power source is installed on the boss via a bracket.

[0015] Furthermore, a valve cover is provided above the valve body, and the valve cover and the valve body are locked by fasteners. The inner side of the bottom of the valve cover protrudes outward to form a protrusion, and a groove is provided on the inner side above the valve body. The protrusion is embedded in the groove and sealed by a seal.

[0016] The beneficial effects of the utility model are:

[0017] 1. The quick-closing check valve of the utility model can quickly and reliably close the valve disc through the design of the driving mechanism when the auxiliary power device fails or there is no shutdown signal, and can force the valve disc to open when the medium is small to prevent the valve disc from constantly colliding with the valve body, thereby increasing the service life of the valve.

[0018] 2. The utility model can limit the opening and closing angle of the valve disc through the design of arc fan-shaped grooves and keys, and can, when the medium is small, drive the cam through the motor and drive the heavy hammer to rise, and during the rising process drive the valve disc to force it to open a certain angle. In this way, when the medium force is small, the phenomenon of the valve disc hitting the valve body can be avoided, thereby increasing the service life of the valve disc.

[0019] 3. The utility model, through the design of the motor, the weight, the cam, the arc fan-shaped groove and the key, can not only use the weight to assist the valve disc to quickly close the valve when the power is on, but also use the gravity of the weight itself to quickly close the valve when the motor loses power, thereby improving the safety of the steam turbine during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of the quick-closing check valve of the utility model in a valve closed state;

[0022] Figure 2 It is a structural schematic diagram of the quick-closing check valve of the utility model in the valve opening state;

[0023] Figure 3-4 This is a schematic diagram of the structure of the valve in the open state of Example 1 of the utility model;

[0024] Figure 5-6 This is a schematic diagram of the structure of the valve in the closed state of Example 1 of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the valve in Embodiment 1 of the utility model, in which the medium force of the valve is small and the valve flap is forced to open by a heavy hammer;

[0026] Figure 8-9 This is a schematic diagram of the structure of the valve in the open state of the embodiment 2 of the utility model;

[0027] Figure 10-11 This is a schematic diagram of the structure of the valve in the closed state of Example 2 of the utility model;

[0028] In the figure: 1-valve body, 2-valve disc, 3-weight, 4-shaft rod, 5-rocker, 6-T-type shaft sleeve, 61-arc fan-shaped groove, 31-rod, 8-boss, 9-motor, 91-output shaft, 10-key, 12-valve cover, 13-fastener, 14-lifting device. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings of the utility model specification 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 of 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.

[0030] Example 1

[0031] like Figure 1-2As shown, a quick-closing check valve includes a valve body 1, a shaft 4, a valve disc 2 and a driving mechanism, wherein the shaft 4 is rotatably connected to the valve body 1, the valve disc 2 is located in the valve body 1 and is fixedly connected to the shaft 4 through a rocker 5, and the driving mechanism includes a weight 3, a support part, a driven clutch structure and an active clutch structure, one end of the weight 3 is a rotating end rotatably connected to the shaft 4, and the support part includes a support member for supporting the weight 3, and a power source for driving the support member to support and drive the weight 3 to rise or move away from the weight 3; in this embodiment, the power source is preferably a motor 9, and the support member is a cam 11. Specifically, a boss 8 is provided on the outside of the valve body 1, and the motor 9 is installed on the boss 8 through a bracket 15, and the cam 11 is fixedly sleeved on the output shaft 91 of the motor 9 and its outer wall is used to support the weight 3.

[0032] In this embodiment, a valve cover 12 is provided above the valve body 1, and the valve cover 12 and the valve body 1 are locked by a fastener 13. The inner side of the bottom of the valve cover 12 protrudes outward to form a protrusion, and a groove is provided on the inner side above the valve body 1. The protrusion is embedded in the groove and sealed by a seal. A lifting device 14 is provided on the top of the valve cover 12.

[0033] In this embodiment, the driven clutch structure is fixedly arranged on the shaft 4, the active clutch structure is fixed on the rotating end and is arranged in cooperation with the driven clutch structure, and the active clutch structure and the driven clutch structure have a rotation margin in the circumferential direction of the shaft 4;

[0034] Specifically, the rotating end has a rotating through hole, which is sleeved on the shaft rod 4 and has a rotating gap between the shaft rod 4. The active clutch structure is an arc fan-shaped groove 61 arranged on the inner wall of the rotating through hole, and the driven clutch structure is a key 10 arranged on the outer wall of the shaft rod 4. The key 10 rotates circumferentially along the inner wall of the arc fan-shaped groove 61.

[0035] Specifically, a sleeve structure is fixedly installed at one end of the weight 3, and the sleeve structure includes a T-shaped sleeve 6, one end of the T-shaped sleeve 6 is sleeved on the outside of the rod 31 of the weight 3 and fixedly connected therebetween, and the other end is a rotating end sleeved on the outside of the shaft 4 and cooperates with the key 10.

[0036] Specifically, the output shaft 91 and the shaft rod 4 have an angle in the axial direction. In this embodiment, the angle is designed to be 90°, that is, the output shaft 91 of the motor is arranged perpendicular to the shaft rod 4, and the rotation of the output shaft 91 drives the cam 11 to rotate;

[0037] The working principle of the quick-closing check valve in this embodiment 1 is:

[0038] When the valve is working normally, a specific signal is sent to the motor 9 or a torque signal is changed to make the motor 9 rotate clockwise to a set position and self-lock, so that the weight 3 rises to the first position under the upward thrust of the cam 11 and is supported and locked by the cam 11. Figure 4As shown, the first position means: the upper side wall of the arc-sector groove 61 no longer restricts the key 10, the key 10 can rotate counterclockwise, and when the valve flap is in the closed state, the lower side wall of the arc-sector groove 61 abuts against the key 10. At this time, the valve flap 2 is not affected by the gravity of the weight 3, and can rotate counterclockwise by the medium force to open the valve; after the medium flow is no longer reduced, the valve flap 2 rotates clockwise under the action of its own gravity to complete the closing of the valve. At this time, the arc-sector groove 61 acts as a limit to the rotation angle of the valve flap 2 for the key 10;

[0039] When the valve needs to be closed, a signal is sent to the motor 9 again, and the cam 11 continues to rotate clockwise. When the highest point of the cam 11 passes over the rod 31 of the heavy hammer 3, the heavy hammer 3 is Figure 3 The valve 10 rotates clockwise as shown in the diagram and descends. During the falling process, the upper side wall of the arc-shaped slot 61 rotates to abut against the upper side wall of the key 10 and continues to push the key 10 to rotate downward, driving the shaft 4 to press the valve disc 2 down to achieve the quick closing of the valve. At this time, the heavy hammer plays a role in assisting the valve disc 2 to close the valve. Figure 5-6 shown.

[0040] In addition, when the motor 9 loses power and the valve needs to be closed, the motor 9 loses its self-locking function after power failure and no longer locks the output shaft 91 of the motor 9. Therefore, the weight 3 will naturally drop under the action of its own gravity, and drive the shaft 4 to rotate to press the valve disc 2 down, and the valve is closed. When the motor loses power, the valve can be protected by closing the valve with the help of the weight.

[0041] In addition, when the medium force is too small, in order to avoid the valve flap 2 from repeatedly opening and closing, when the valve is working normally, the output shaft 91 rotates to drive the cam 11 to rotate, thereby driving the weight 3 to rise, so that the weight 3 is slightly higher than the first position, such as Figure 7 As shown, under the limit of the key 10, the lower side wall of the arc fan-shaped groove 61 drives the key 10 to rotate counterclockwise by a certain angle during the rising process of the heavy hammer 3, thereby driving the valve flap 2 to be forced to open by a certain angle. In this way, when the medium force is small, the phenomenon of the valve flap hitting the valve body can be avoided, thereby improving the service life of the valve flap.

[0042] Example 2

[0043] The difference from the first embodiment is that the output shaft 91 of the motor 9 is arranged parallel to the shaft 4 .

[0044] The working principle of the fast closing check valve in this embodiment 2 is:

[0045] When the valve is working normally, a specific signal is sent to the motor 9 or the torque signal is changed to make the motor 9 rotate counterclockwise to the set position and self-lock, so that the weight 3 rises to the first position under the upward thrust of the cam 11 and is supported and locked by the cam 11. Figure 8-9As shown, the first position here means: the upper side wall of the arc-sector groove 61 no longer restricts the key 10, the key 10 can rotate clockwise, and when the valve flap is in the closed state, the lower side wall of the arc-sector groove 61 abuts against the key 10. At this time, the valve flap 2 is not affected by the gravity of the weight 3, and can rotate clockwise by the medium force to open the valve; after the medium flow is no longer reduced, the valve flap 2 rotates counterclockwise under the action of its own gravity to complete the closing of the valve. At this time, the arc-sector groove 61 plays a role in limiting the rotation angle of the valve flap 2 for the key 10;

[0046] When the valve needs to be closed, a signal is sent to the motor 9 again, and the cam 11 rotates clockwise. When the cam 11 no longer supports the rod 31 of the heavy hammer 3, the heavy hammer 3 Figure 10-11 As shown in the diagram, it rotates counterclockwise to descend. During the falling process, the upper side wall of the arc fan-shaped groove 61 rotates to abut against the upper side wall of the key 10 and continues to push the key 10 to rotate counterclockwise downward, driving the shaft 4 to press the valve flap 2 down to achieve quick closing of the valve. At this time, the heavy hammer can assist the valve flap 2 in closing the valve.

[0047] When the motor 9 loses power and the valve needs to be closed, the motor 9 loses its self-locking function after losing power and no longer locks the output shaft 91 of the motor 9. Therefore, the weight 3 will drop counterclockwise under the action of its own gravity, and drive the shaft 4 to rotate to press the valve disc 2 down, and the valve is closed. When the motor loses power, the weight can be used to assist in closing the valve to protect the valve.

[0048] In addition, when the medium force is too small, in order to avoid the valve flap 2 from repeatedly opening and closing, when the valve is working normally, the output shaft 91 rotates to drive the cam 11 to rotate, thereby driving the weight 3 to rise, so that the weight 3 is slightly higher than the first position, such as Figure 7 As shown, under the limit of the key 10, the lower side wall of the arc fan-shaped groove 61 drives the key 10 to rotate clockwise by a certain angle during the rising process of the heavy hammer 3, thereby driving the valve flap 2 to be forced to open by a certain angle. In this way, when the medium force is small, the phenomenon of the valve flap hitting the valve body can be avoided, thereby improving the service life of the valve flap.

[0049] The above disclosures are merely two preferred embodiments of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A quick-closing check valve, characterized in that: The valve body (1) comprises a valve body (1), a shaft (4), a valve flap (2) and a driving mechanism, wherein the shaft (4) is rotatably connected to the valve body (1), the valve flap (2) is located in the valve body (1) and is fixedly connected to the shaft (4), the driving mechanism comprises a weight (3), a support portion, a driven clutch structure and an active clutch structure, one end of the weight (3) is a rotating end rotatably connected to the shaft (4), the support portion comprises a support member for supporting the weight (3), and a power source for driving the support member to support and drive the weight (3) to rise or move away from the weight (3); The power source is mounted on the valve body (1), the driven clutch structure is fixedly arranged on the shaft (4), the active clutch structure is fixed on the rotating end and is arranged in cooperation with the driven clutch structure, and the active clutch structure and the driven clutch structure have a rotation margin in the circumferential direction of the shaft (4).

2. A quick closing check valve according to claim 1, characterized in that: The rotating end has a rotating through hole, and the rotating end is sleeved on the shaft (4) and has a rotating gap between the rotating end and the shaft (4). The active clutch structure is an arc fan-shaped groove (61) arranged on the inner wall of the rotating through hole, and the driven clutch structure is a key (10) arranged on the outer wall of the shaft (4), and the key (10) rotates circumferentially along the inner wall of the arc fan-shaped groove (61).

3. A quick closing check valve according to claim 2, characterized in that: A sleeve structure is fixedly mounted on one end of the weight (3), and the sleeve structure comprises a T-shaped sleeve (6), one end of the T-shaped sleeve (6) is sleeved on the outside of the rod (31) of the weight (3) and fixedly connected thereto, and the other end is a rotating end sleeved on the outside of the shaft (4) and matched with the key (10).

4. A quick closing check valve according to claim 1, characterized in that: The power source is a motor (9), and one side of the support member is fixedly connected to an output shaft (91) of the motor (9).

5. A quick closing check valve according to claim 4, characterized in that: The supporting member is a cam (11), the cam (11) is fixedly sleeved on the output shaft (91) of the motor (9), and the outer wall of the cam (11) is used to support the heavy hammer (3).

6. A quick closing check valve according to claim 4, characterized in that: The output shaft (91) and the shaft rod (4) have an included angle in their axial directions.

7. A quick closing check valve according to claim 6, characterized in that: The output shaft (91) is arranged perpendicularly to the shaft rod (4).

8. The fast closing check valve according to claim 4, characterized in that: The output shaft (91) is arranged parallel to the shaft rod (4).

9. The fast closing check valve according to claim 1, characterized in that: A boss (8) is provided on the outside of the valve body (1), and the power source is mounted on the boss (8) via a bracket (15).

10. The fast closing check valve according to claim 1, characterized in that: A valve cover (12) is provided above the valve body (1), and the valve cover (12) and the valve body (1) are locked by a fastener (13). The inner side of the bottom of the valve cover (12) protrudes outward to form a raised portion, and a groove is provided on the inner side above the valve body (1). The raised portion is embedded in the groove and is sealed by a sealing member.

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