Check valve

Abstract

The invention relates to the technical field of valve devices, in particular to a check valve which comprises a sealing shell, a valve element, a valve element, a valve element, a valve element, a valve element, a valve element, a valve element, a valve element, a valve element and a valve element, and is characterized in that a fluid inlet and a fluid outlet are formed in the sealing shell; the valve clack assembly is fixedly mounted on the rotating pin shaft, and the valve clack assembly has a first state for blocking the fluid inlet and a second state for swinging around the rotating pin shaft to open the fluid inlet; the indicating assembly is installed at the end, extending out of the sealing shell, of the rotating pin shaft, and a signal transmitting piece is arranged in the indicating assembly. In the action process of the valve clack assembly, the rotating pin shaft rotates at the same time, and then the indicating assembly located on the outer side of the sealing shell is driven to act together, so that the signal transmitting piece can transmit the state of the indicating assembly into an external control chamber in real time, and the state of the indicating assembly corresponds to the state of the valve clack assembly one to one; therefore, the state of the valve clack assembly can be known, and the on-off state of the check valve can be fed back in real time.

Description

Technical Field

[0001] The invention relates to the technical field of valve devices, and in particular to a check valve. Background Art

[0002] A check valve is a valve whose opening and closing parts are valve disc components and which blocks the backflow of media by its own weight and the pressure of the media. The media flows in from the inlet and flows out from the outlet. When the inlet pressure is greater than the sum of the weight of the valve disc component and its flow resistance, the valve is opened. On the contrary, when the media flows back, the valve is closed. The swing check valve has a valve disc component that is tilted and can rotate around the axis. Check valves are often used as bottom valves of pumping devices to prevent the backflow of water.

[0003] In the fields of nuclear power, oil and gas pipelines, petrochemicals, etc., with the improvement of information technology, the control room of industrial pipelines needs to convert the mechanical signal of valve switch into control signal feedback control room. In the prior art, the check valve has a sealed and opaque structure, the valve switch state cannot be determined from the outside of the check valve, and it is opened and closed by its own gravity during operation. The information control system cannot receive the valve switch state signal, resulting in the control room being unable to directly obtain the state of each check valve working in the system. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the check valve in the prior art cannot feedback the switch state, thereby providing a check valve.

[0005] In order to solve the above technical problems, the present invention provides a check valve, comprising:

[0006] A sealing shell is provided with a fluid inlet and a fluid outlet, a rotating pin is rotatably mounted at the fluid inlet, and at least one end of the rotating pin penetrates the sealing shell;

[0007] A valve flap assembly is fixedly mounted on the rotating pin shaft, and the valve flap assembly has a first state of blocking the fluid inlet, and a second state of swinging around the rotating pin shaft to open the fluid inlet;

[0008] The indicating assembly is installed at one end of the rotating pin shaft extending to the outside of the sealed housing, and a signal transmitting component is arranged in the indicating assembly.

[0009] Optionally, the indication component includes:

[0010] The indicator body is fixedly connected to the rotating pin;

[0011] A travel switch is fixedly connected to the outer side wall of the sealed housing, and the travel switch is electrically connected to the signal transmitting element;

[0012] When the valve flap assembly is in the first state and / or the second state, the indicator body abuts against the travel switch to drive the travel switch to move, and the signal transmitter emits the state of the travel switch to indicate the state of the valve flap assembly.

[0013] Optionally, a pair of travel switches are provided, and when the valve flap assembly is in a first state, the indicator body abuts against one of the travel switches; when the valve flap assembly is in a second state, the indicator body abuts against the other travel switch.

[0014] Optionally, a sealing assembly is installed on the sealing housing, and the rotating pin passes through the sealing assembly.

[0015] Optionally, the sealing assembly comprises:

[0016] The sealing sleeve is arranged on the outer side of the rotating pin shaft, and the sealing sleeve is fixedly installed on the outer side wall of the sealing housing;

[0017] The sealing packing is filled and arranged between the side wall of the rotating pin shaft and the sealing housing, and the sealing pressing sleeve is tightly abutted and matched with the sealing packing.

[0018] Optionally, the sealing assembly further comprises a fastening pressure plate, which is fixedly connected to the outer side wall of the sealing housing, and the sealing sleeve is installed between the fastening pressure plate and the sealing packing.

[0019] Optionally, a sealed bearing is installed between the outer side wall of the rotating pin shaft and the fastening pressure plate.

[0020] Optionally, the valve flap assembly comprises:

[0021] A valve disc body adapted to cooperate with a fluid inlet for sealing;

[0022] The rotating member is installed on the side of the valve disc body away from the fluid inlet, and the rotating member is rotatably installed on the rotating pin shaft.

[0023] Optionally, a connection block is fixedly installed in the inner cavity of the sealing shell, and the rotating pin is rotatably matched with the connection block.

[0024] Optionally, a support bearing is installed between the rotating pin and the connecting block.

[0025] The technical solution of the present invention has the following advantages:

[0026] 1. The check valve provided by the present invention comprises: a sealing shell, on which a fluid inlet and a fluid outlet are provided, a rotating pin is rotatably installed at the fluid inlet, and at least one end of the rotating pin passes through the sealing shell; a valve flap assembly, fixedly installed on the rotating pin, the valve flap assembly has a first state of blocking the fluid inlet, and a second state of swinging around the rotating pin to open the fluid inlet; an indicating assembly, installed at one end of the rotating pin extending to the outside of the sealing shell, and a signal transmitting component is arranged in the indicating assembly.

[0027] When the check valve is working, the valve disc assembly drives the rotating pin to rotate under the pressure of the passing fluid and the gravity of the valve disc assembly itself, so as to realize the opening and closing of the check valve. During the operation of the valve disc assembly, the rotating pin rotates at the same time, thereby driving the indicating assembly located outside the sealing shell to operate together, so that the signal transmitter can transmit the status of the indicating assembly to the external control room in real time. The status of the indicating assembly corresponds to the status of the valve disc assembly one by one, and then the status of the valve disc assembly can be known, realizing the real-time feedback of the switch status of the check valve.

[0028] 2. The check valve provided by the present invention includes an indicator body and a travel switch. When the valve flap assembly is in the first state and / or the second state, the indicator body abuts against the travel switch to drive the travel switch to move, and the signal transmitter transmits the state of the travel switch to the outside to indicate the state of the valve flap assembly. By cooperating with the indicator body and the travel switch, when the state of the valve flap assembly changes, the indicator body can be driven to move by rotating the pin shaft, thereby touching the travel switch, and the state of the travel switch is used to indicate the state of the valve flap assembly. The travel switch itself can convert the position signal into an electrical signal, and then transmit it to the outside, which can simplify the signal processing and transmission process, reduce the signal error generated in the signal transmission process, and improve the accuracy of the switch state signal fed back by the check valve.

[0029] 3. The sealing assembly of the check valve provided by the present invention includes a sealing sleeve and a sealing packing, and the sealing sleeve and the sealing packing are tightly abutted and matched. The sealing sleeve and the sealing packing are used to seal the gap between the rotating pin shaft and the sealing housing, thereby ensuring the reliability of the overall sealing of the sealing housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a front cross-sectional view of a check valve provided in an embodiment of the present invention, in which the valve flap assembly shown by the solid line is in a first state, and the valve flap assembly shown by the dotted line is in a second state.

[0032] Figure 2 It is a side view of a check valve provided in an embodiment of the present invention.

[0033] Figure 3 It is a side cross-sectional view of a check valve provided in an embodiment of the present invention.

[0034] Figure 4 It is a schematic structural diagram of a valve flap assembly provided in an embodiment of the present invention.

[0035] Figure 5 It is a schematic structural diagram of the cooperation between the rotating pin shaft and the indicator plate structure provided in an embodiment of the present invention.

[0036] Figure 6 It is a schematic diagram of the structure of the cooperation between the rotating pin and the pendulum structure provided in an embodiment of the present invention.

[0037] Figure 7 It is a schematic structural diagram of the cooperation between the rotating pin and the indicating rod structure provided in an embodiment of the present invention.

[0038] Explanation of the accompanying drawings: 1. Valve disc body; 2. Seat ring; 3. Rocker; 4. Rotating pin; 5. Connecting block; 6. Connecting bolt; 7. Sealing packing; 8. Sealing sleeve; 9. Fastening bolt; 10. Limiting plate; 11. Sealing bearing; 12. Mounting screw; 13. Indicator plate structure; 14. Fastening pressure plate; 15. Support screw; 16. Support plate; 17. Travel switch: 18. Fixing nut; 19. Washer; 20. Support bearing; 21. Pendulum structure; 22. Indicator rod structure; 23. Fixed pin; 24. Sealing housing. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Figures 1 to 7 The figure shows a check valve provided in this embodiment, which includes a sealing housing 24, a valve flap assembly and an indication assembly.

[0044] like Figure 1 As shown, the sealed housing 24 is provided with a fluid inlet and a fluid outlet, and a rotating pin 4 is rotatably mounted at the fluid inlet, and at least one end of the rotating pin 4 is arranged to penetrate the sealed housing 24. The valve flap assembly is fixedly mounted on the rotating pin 4, and the valve flap assembly has a first state of blocking the fluid inlet, and a second state of swinging around the rotating pin 4 to open the fluid inlet. The indicator assembly is mounted on one end of the rotating pin 4 extending to the outside of the sealed housing 24, and a signal transmitter is arranged in the indicator assembly.

[0045] like Figure 2 As shown, the indicating assembly includes an indicating member body and a travel switch 17. The indicating member body is fixedly connected to the rotating pin 4. The travel switch 17 is fixedly connected to the outer wall of the sealing housing 24, and the travel switch 17 is electrically connected to the signal transmitting member. When the valve flap assembly is in the first state and / or the second state, the indicating member body abuts against the travel switch 17 to drive the travel switch 17 to move, and the signal transmitting member transmits the state of the travel switch 17 to the outside to indicate the state of the valve flap assembly. In order to more accurately use the travel switch 17 to indicate the state of the valve flap assembly, a pair of travel switches 17 are provided in this embodiment. When the valve flap assembly is in the first state, the indicating member body abuts against one of the travel switches 17; when the valve flap assembly is in the second state, the indicating member body abuts against the other travel switch 17.

[0046] like Figure 3As shown, in order to ensure the sealing performance of the sealing housing 24, a sealing assembly is installed on the sealing housing 24, and the rotating pin 4 passes through the sealing assembly. Specifically, the sealing assembly includes a sealing sleeve 8, a sealing packing 7 and a fastening plate 14. The sealing sleeve 8 is movably sleeved on the outside of the rotating pin 4, and the sealing sleeve 8 is fixedly installed on the outer wall of the sealing housing 24. The sealing packing 7 is filled and arranged between the side wall of the rotating pin 4 and the sealing housing 24, and the sealing sleeve 8 is tightly abutted with the sealing packing 7. The fastening plate 14 is fixedly connected to the outer wall of the sealing housing 24 by bolts, and the sealing sleeve 8 is installed between the fastening plate 14 and the sealing packing 7. In order to avoid limitation between the rotating pin 4 and the fastening plate 14, a sealing bearing 11 is installed between the outer wall of the rotating pin 4 and the fastening plate 14.

[0047] like Figure 4 As shown, the valve flap assembly includes a valve flap body 1 and a rocker 3 as a rotating member. The valve flap body 1 is suitable for sealing with a fluid inlet. The rotating member is installed on the side of the valve flap body 1 away from the fluid inlet, and the rotating member is rotatably installed on the rotating pin 4. A "concave" type connecting block 5 is fixedly installed in the inner cavity of the sealing housing 24 by a connecting bolt 6, and the rotating pin 4 is rotatably matched with the connecting block 5. A supporting bearing 20 is installed between the rotating pin 4 and the two connecting arms of the connecting block 5. The rocker 3 as a rotating rod is arranged in the groove of the connecting block 5, and is rotatably matched with the rotating pin 4.

[0048] When assembling the check valve structure with switch feedback provided in this embodiment, firstly, the rocker 3 as a rotating part is passed through the mounting hole of the valve disc body 1, and then the rocker 3 is fixed to the valve disc body 1 by the fixing nut 18 and the washer 19, and finally the fixing nut 18 and the valve disc body 1 are fixed to prevent loosening by the fixing pin 23. The connecting block 5 is installed into the corresponding position from the upper part of the sealing housing 24, and is fastened and fixed by the connecting bolt 6. The sealing packing 7, the sealing sleeve 8, the fastening plate 14, and the sealing bearing 11 are installed in the external position of the sealing housing 24 in sequence. Two supporting bearings 20 are pre-installed on the connecting block 5 inside the sealing housing 24, and then the rocker 3 is placed in the corresponding position of the connecting block 5, and the rotating pin 4 is passed through the pre-installed sealing parts, and the square head structure of the rotating pin 4 passes through the supporting bearing 20 and the rocker 3 in sequence. The sealing bearing 11 and the bearing stop plate 10 are successively installed on the rotating pin 4 outside the sealing housing 24, and finally the pressing plate is pressed by the clamping bolt as a fastener. After the valve cover and the middle cavity of the sealing housing 24 are fastened, the indicator body is fastened and fixed by the mounting screw 12 at the end of the rotating pin 4 facing the outside. The positions of the mounting support plate 16 and the two travel switches 17 are determined outside the sealing housing 24 according to the positions of the indicator body and the valve switch. The support plate 16 is fixed to the outer wall of the sealing housing 24 by the supporting screw 15.

[0049] The seat ring 2 is installed on the inner side of the fluid inlet, and the angle deviation between the sealing surface axis of the seat ring 2 after welding and the axis of the fluid inlet channel is 5°, so as to realize a small pressure difference sealing valve. The valve disc body 1 in this embodiment is a circular plate structure, which can be rotated downward to cooperate with the sealing surface of the seat ring 2 to limit the position, and rotated upward to limit the position between the tail of the rocker 3 and the inner wall of the sealing shell 24 to reduce the damage caused by the impact of the valve disc body 1 during each switching process. Because the sealing performance of the check valve is related to the relative position of the valve disc body 1 and the seat ring 2, two limiting bosses are set on the valve disc body 1 to cooperate with the rocker 3 to prevent the valve disc body 1 from rotating during the switching process. The automatic alignment function of the valve disc body 1 on the sealing surface is realized by setting a spherical and cylindrical matching structure at the connection position of the valve disc body 1 and the rocker 3. To prevent the rocker 3 and the valve disc body 1 from loosening after a long time of operation, the valve disc body 1 and the fixing nut 18 are tightened and drilled again to prevent loosening and fix through the fixing pin 23.

[0050] The four-way connection between the rotating pin 4 and the rocker 3 can accurately transfer the rotation angle of the valve body 1 to the rotating pin 4 through the matching connection, and finally to the indicator body. The switch position can be displayed on the outside of the sealed housing 24. At the same time, according to the contact and collision between the indicator body and the travel switch 17, the position signal can be converted into an electrical signal and fed back to the control room to realize remote control and display of the valve switch state. The head of the rotating pin 4 and the support bearing 20 are matched in four directions. The support bearing 20 adopts an inner square outer circle structure, and the outer circle structure and the connecting block 5 are used to support the suspension rocker 3, so as to realize the low friction rotation switch of the valve body 1 component structure inside the valve. Because the rotating pin 4 and the rocker 3 rotate together, but at the same time, because the rotating pin 4 is an outwardly extending structure, a sealing filler 7 is added at the external position to form an external sealing structure. In order to ensure the external sealing effect, the fastening bolt 9 as a fastener needs to apply a large torque. In view of this situation, a step structure is set at the outwardly extending position of the rotating pin 4, and two sealing bearings 11 are added to reduce the friction force of the rotating pin 4 during rotation.

[0051] The rocker 3 rotates with the opening and closing of the valve body 1, and transmits torque to the rotating pin 4 through four-way cooperation. Due to axial transmission, the rotational motion is transmitted to the outside of the valve. The indicator body and the rotating pin 4 are connected and fastened by installing screws 12, so that the rotational motion of the rocker 3 is transmitted and displayed on the indicator body. By setting the opening and closing local indication marks on the support plate 16, the local display function of the switch position inside the valve outside the valve can be realized. At the same time, corresponding travel switches 17 are added at the two positions of the switch to convert the mechanical signal of the switch position into an electrical signal and then transmit it back to the control room through a cable. The travel switch 17 can adjust the installation position on the support plate 16, and the angle of the touch wheel of the travel switch 17 can be adjusted to achieve installation coordination with valves of different specifications.

[0052] like Figure 5 As shown, the special design of the rotating pin shaft 4 can realize the on-site display outside the valve and the feedback display in the control room of the switching state of the valve flap body 1, which is the sealing part inside the valve. It can also be used as a force arm output structure. When the valve needs an external torque transmission method to control the switching of the valve flap body 1, the indicator body can be simply replaced with an actuator to transmit torque to control the switching of the valve flap body 1 through an external handle, handwheel, gear box or electric device, pneumatic device and other actuators. The indicator body in this embodiment is a fan-shaped indicator plate structure 13 with rounded corners. In other embodiments, the indicator plate structure 13 can also be replaced with a pendulum structure 21 or an indicator rod structure 22 to realize the slow opening and closing of the valve flap body 1, reduce the sealing surface damage caused by direct metal impact during the switching process of the valve flap body 1 or the valve seal leakage caused by the change of the valve flap body 1 structure, and reduce water hammer impact, such as Figure 6 and Figure 7 shown.

[0053] In order to solve the problem that the check valve cannot determine the valve switch state from the outside and the information control system cannot receive the valve switch state signal in the prior art, the check valve flap switch state needs to be controlled by an external driving torque and a pendulum structure 21 is added externally to realize the function of slowly closing the valve flap. The check valve can transmit the switch state inside the sealing housing 24 to the outside of the sealing housing 24 by rotating the pin 4. A packing sealing structure is added at the external connection structure to realize the sealing function of the sealing housing 24.

[0054] The indicator body is installed on the outside of the sealed housing 24 by screws and the position of the travel switch 17 on the corresponding support plate 16 is adjusted, so that the external limit feedback can realize the respective functions, and the switching between different functions can be realized by changing the indicator body or pendulum or other actuators at the external connection. At the customer site, the installation position of the travel switch 17 on the support plate 16 and the angle of the touch wheel can be changed to realize the connection of valves of different specifications and on-site electrical signals.

[0055] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A check valve, characterized in that: include: A sealed housing (24) is provided with a fluid inlet and a fluid outlet, a rotating pin (4) is rotatably mounted at the fluid inlet, and at least one end of the rotating pin (4) passes through the sealed housing (24); a valve flap assembly fixedly mounted on the rotating pin shaft (4), the valve flap assembly having a first state of blocking the fluid inlet and a second state of swinging around the rotating pin shaft (4) to open the fluid inlet; An indicating component is mounted on one end of the rotating pin shaft (4) extending to the outside of the sealing housing (24), and a signal transmitting component is arranged inside the indicating component.

2. The check valve according to claim 1, characterized in that: The indication component comprises: An indicator body fixedly connected to the rotating pin (4); A travel switch (17) is fixedly connected to the outer wall of the sealed housing (24), and the travel switch (17) is electrically connected to the signal transmitting element; When the valve flap assembly is in the first state and / or the second state, the indicator body abuts against the travel switch (17) to drive the travel switch (17) to move, and the signal transmitter emits the state of the travel switch (17) to indicate the state of the valve flap assembly.

3. The check valve according to claim 2, characterized in that: A pair of travel switches (17) are provided. When the valve flap assembly is in a first state, the indicator body abuts against one of the travel switches (17); when the valve flap assembly is in a second state, the indicator body abuts against the other travel switch (17).

4. The check valve according to any one of claims 1 to 3, characterized in that: A sealing assembly is installed on the sealing housing (24), and the rotating pin shaft (4) is arranged to pass through the sealing assembly.

5. The check valve according to claim 4, characterized in that: The sealing assembly comprises: A sealing sleeve (8) which is movably mounted on the outside of the rotating pin shaft (4), and the sealing sleeve (8) is fixedly mounted on the outer side wall of the sealing housing (24); The sealing filler (7) is filled and arranged between the side wall of the rotating pin shaft (4) and the sealing housing (24), and the sealing sleeve (8) is tightly abutted against the sealing filler (7).

6. The check valve according to claim 5, characterized in that: The sealing assembly further comprises a fastening plate (14) which is fixedly connected to the outer side wall of the sealing housing (24); the sealing sleeve (8) is installed between the fastening plate (14) and the sealing packing (7).

7. The check valve according to claim 6, characterized in that: A sealed bearing (11) is installed between the outer side wall of the rotating pin shaft (4) and the fastening pressure plate (14).

8. The check valve according to any one of claims 1 to 3, characterized in that: The valve flap assembly comprises: A valve flap body (1), which is suitable for sealing with the fluid inlet; The rotating member is mounted on a side of the valve flap body (1) away from the fluid inlet, and the rotating member is rotatably mounted on the rotating pin shaft (4).

9. The check valve according to any one of claims 1 to 3, characterized in that: A connecting block (5) is fixedly installed in the inner cavity of the sealing shell (24), and the rotating pin shaft (4) is rotatably matched with the connecting block (5).

10. The check valve according to claim 9, characterized in that A support bearing (20) is installed between the rotating pin shaft (4) and the connecting block (5).

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