CN110397770B

CN110397770B - Check valve

Info

Publication number: CN110397770B
Application number: CN201910704899.8A
Authority: CN
Inventors: 严涛; 丁超; 果春焕; 史可任; 王金鹤; 李伟
Original assignee: Jiangsu Sny Valve Co ltd
Current assignee: Jiangsu Sny Valve Co ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-11-13
Anticipated expiration: 2039-07-31
Also published as: CN110397770A

Abstract

The present invention provides a check valve, characterized by comprising: the valve body assembly is provided with a valve clack, a valve seat, a connecting pipe and a push rod, the valve clack is in an inverted trapezoid shape, and the lower end of the push rod is connected with the upper end of the valve clack; the outer wall of the electromagnetic assembly is connected with the connecting pipe; a coil, a movable iron core and a spring are arranged in the outer wall; the flow guide assembly is characterized in that a sliding block is arranged in a flow guide pipeline of the flow guide assembly, a conductive block is arranged on the sliding block, two conductive contacts are arranged in the flow guide pipeline, and the conductive block can conduct or disconnect the two conductive contacts; the two conductive contacts are connected with the coil, the power supply and the circuit switch in series. The valve clack used by the application can be completely pulled out from the medium between the valve body inlet and the valve body outlet, so that when the check valve is conducted, the pressure and the flow of the medium are not influenced, and the check valve can be used for the condition of large flow; meanwhile, the impact of the medium on the valve clack and the abrasion between the valve clack and the valve body are reduced, and the service life of the check valve is prolonged.

Description

Check valve

Technical Field

The invention relates to the technical field of valves, in particular to a check valve.

Background

At present, common check valves are swing check valves (rotating according to the gravity center) and lifting check valves (moving along the axis), but due to the existence of a valve clack or a valve core, when a medium passes through the check valve, the pressure is seriously reduced, and the flow is reduced; and because the movement of the valve clack or the valve core directly depends on the pressure difference of media at two sides, the impact on the valve clack or the valve core is too much, the service life of the check valve is shortened, and the traditional lifting check valve (moving along the axis) has larger projection surface of the media in the movement direction of the valve, so the pressure of the media to be overcome in the movement process of the valve is also large.

Disclosure of Invention

In order to overcome the above problems, the present invention provides a check valve, which uses a liftable valve flap, thereby having little influence on the pressure and flow of a medium passing through the check valve, and specifically comprises:

the valve body assembly is characterized in that a valve body inlet and a valve body outlet are respectively arranged at two ends of a valve body of the valve body assembly; the middle part of the valve body is provided with a valve clack which is in an inverted trapezoid shape; valve seats are arranged on two sides of the valve clack; the upper end of the middle part of the valve body is provided with a connecting pipe; a push rod is arranged in the connecting pipe, the push rod and the side wall of the connecting pipe are sealed and can slide, and the lower end of the push rod is connected with the upper end of the valve clack;

the electromagnetic assembly is arranged on the upper part of the valve body assembly; the outer wall of the electromagnetic assembly is connected with the connecting pipe; a coil is arranged in the outer wall; a movable iron core is arranged in the coil; the lower part of the movable iron core is connected with the push rod; a spring is arranged on the upper part of the movable iron core, and the upper part of the spring is connected with the top of the outer wall;

the two ends of a flow guide pipeline of the flow guide assembly are respectively connected with the valve body inlet and the valve body outlet; a sliding block is arranged in the flow guide pipeline, and the sliding block separates a medium at the inlet of the valve body from a medium at the outlet of the valve body in the flow guide pipeline; the sliding block is provided with a conductive block, the flow guide pipeline is internally provided with two conductive contacts, and the conductive block can conduct or disconnect the two conductive contacts; the two conductive contacts are connected with the coil, the power supply and the circuit switch in series.

Furthermore, the sliding block is made of polyurethane materials, sealing rings are arranged at one end and the middle part of the medium, close to the outlet of the valve body, of the sliding block, the conductive block and the two conductive contacts are arranged between the two sealing rings, and the two conductive contacts limit the movement range of the sliding block.

Further, the conductive block and the conductive contact are both annular.

Further, the circuit switch is a relay, and the relay is electrically connected with the PLC system.

Furthermore, sealing gaskets are arranged on two sides of the valve clack.

Furthermore, the area of one end, close to the valve body inlet, of the sliding block is smaller than that of one end, close to the valve body outlet, of the sliding block.

Furthermore, the spring also comprises a guide rod, and the guide rod is arranged in the spring and is connected with the upper part of the outer wall.

Furthermore, the guide rod is provided with external threads, and one end of the guide rod, which is far away from the movable iron core, extends out of the outer wall; the upper part of the outer wall is provided with matched internal threads; the guide rod can rotate in the outer wall internal thread so as to move along the axial direction.

The device further comprises a stepping motor, one end of the guide rod, which is far away from the movable iron core, is connected with the stepping motor, and the stepping motor can drive the guide rod to rotate around a shaft; the stepping motor is electrically connected with the PLC system.

Further, the PLC system uses Siemens S7-200.

The flow guide assembly is used for judging the pressure of the medium at the two ends of the check valve and judging the possible flow direction of the medium, so that the on-off of the electromagnetic assembly is controlled through the movement of the sliding block, the lifting of the valve clack is controlled, and the single flow of the medium is realized. Because the valve clack used by the application can be completely pulled out from the medium between the valve body inlet and the valve body outlet, when the check valve is conducted, the pressure and the flow of the medium are not influenced, and the check valve can be used for the condition of large flow; and because the valve clack moves by means of the combined action of the flow guide assembly and the electromagnetic assembly, the impact of a medium on the valve clack and the abrasion between the valve clack and the valve body are reduced, and the service life of the check valve is prolonged. And the action area of the medium on the valve clack in the movement direction of the valve clack is small, so that the valve clack can be pushed by small thrust to realize the control of the medium with large flow in a large pipeline.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of a check valve;

FIG. 2: an enlarged view of a portion a in fig. 1;

FIG. 3: the portion B in fig. 1 is enlarged.

Description of reference numerals: 1. a valve body; 2. a valve body inlet; 3. an outlet of the valve body; 4. a valve flap; 5. a valve seat; 6. connecting pipes; 7. a push rod; 8. an outer wall; 9. a coil; 10. a movable iron core; 11. a spring; 12. a diversion pipeline; 13. a slider; 14. a conductive block; 15. a conductive contact; 16. a seal ring; 17. a guide bar; 18. and a gasket.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

The present invention provides a check valve, as shown in fig. 1, 2, and 3, specifically comprising: the valve body assembly is characterized in that two ends of a valve body 1 of the valve body assembly are respectively provided with a valve body inlet 2 and a valve body outlet 3; the middle part of the valve body is provided with a valve clack 4 which is in an inverted trapezoid shape; valve seats 5 are arranged on two sides of the valve clack 4; the upper end of the middle part of the valve body 1 is provided with a connecting pipe 6; a push rod 7 is arranged in the connecting pipe 6, the push rod 7 and the side wall of the connecting pipe 6 are sealed and can slide, and the lower end of the push rod 7 is hinged with the upper end of the valve clack 4;

the electromagnetic assembly is arranged on the upper part of the valve body assembly; the outer wall 8 of the electromagnetic assembly is connected with the connecting pipe 6; a coil 9 is arranged in the outer wall 8; a movable iron core 10 is arranged in the coil 9; the lower part of the movable iron core 10 is connected with the push rod 7; a spring 11 is arranged at the upper part of the movable iron core 10, and the upper part of the spring 11 is connected with the top of the outer wall 8;

the two ends of a guide pipeline 12 of the guide assembly are respectively connected with the valve body inlet 2 and the valve body outlet 3; a sliding block 13 is arranged in the flow guide pipeline 12, and the sliding block 13 separates a medium at the valve body inlet 2 from a medium at the valve body outlet 3 in the flow guide pipeline 12; a conductive block 14 is arranged on the sliding block 13, two conductive contacts 15 are arranged in the flow guide pipeline 12, and the conductive block 14 can connect or disconnect the two conductive contacts 15; two of the conductive contacts 15 are in series with the coil, power supply, circuit switch.

The working principle of the technical scheme is as follows:

the flow guide assembly is used for judging the pressure of the medium at two ends of the check valve, and the possible flow direction of the medium is judged, so that the on-off of the electromagnetic assembly is controlled through the movement of the sliding block. Specifically, when the medium pressure of the valve body inlet 2 is greater than the medium pressure of the valve body outlet 3, the pressure pushes the sliding block 13 to drive the conductive block 14 to connect the two conductive contacts 15, and when the medium pressure of the valve body inlet 2 is less than or equal to the medium pressure of the valve body outlet 3, the pressure pushes the sliding block 13 to drive the conductive block 14 to disconnect the two conductive contacts 15.

Two of the conductive contacts 15 are used in series with the coil, power supply, circuit switch to control the operation of the electromagnetic assembly and thus the lifting and lowering of the valve flap. When the valve clack descends, the valve clack is pressed on the valve seat only due to the pressure difference between two sides of the valve clack, and therefore single-phase flow of the medium is achieved.

The beneficial effects of the above technical scheme are: because the valve clack used by the application can be completely pulled out from the medium between the valve body inlet and the valve body outlet, when the check valve is conducted, the pressure and the flow of the medium cannot be influenced, and the check valve can be used for the condition of large flow. Because the check valve of this application does not rely on the medium pressure of valve clack both sides directly to promote the opening and closing of valve clack, but relies on the combined action of water conservancy diversion subassembly and electromagnetic component, so reduce the impact of medium to the valve clack and the wearing and tearing between valve clack and the valve body to increase check valve's life. And the action area of the medium on the valve clack in the movement direction of the valve clack is small, so that the valve clack can be pushed by small thrust to realize the control of the medium with large flow in a large pipeline.

In one embodiment, the sliding block is made of polyurethane material, the sliding block is provided with a sealing ring 16 at one end and in the middle of the medium close to the valve body outlet, the conductive block 14 and the two conductive contacts 15 are arranged between the two sealing rings 16, and the two conductive contacts 15 limit the movement range of the sliding block 13.

This embodiment provides a concrete structure of sliding block, sets up the sealing ring on the sliding block, sets up conducting block and conductive contact between the sealing ring to the influence of medium to conducting block and conductive contact has been reduced. Meanwhile, the conductive contact is arranged between the sealing rings, so that the sliding range of the sliding block in the flow guide pipeline is restrained, and the flow guide assembly can run more stably and reliably.

In one embodiment, the conductive block 14 and the conductive contact 15 are both annular.

The embodiment uses the annular conductive block and the conductive contact, so that the conductive block and the conductive contact can be connected or disconnected more stably and reliably when the sliding block moves.

In one embodiment, the circuit switch is a relay that is electrically connected to the PLC system.

When circuit switch is the relay, when the relay is connected with the PLC system electricity, then can directly use the check valve of PLC system control this embodiment whether to operate. When the check valve is expected to be stopped, namely the check valve is closed all the time, the PLC system is only used for controlling the relay to break the circuit; when the check valve is required to be restarted, namely media can pass through in a single direction, only a PLC system is used for controlling a relay to connect a circuit. Thus, automation control in actual production can be facilitated.

In one embodiment, the valve flap 4 is provided with gaskets 18 on both sides.

Increase sealed the pad in valve clack both sides, can play better sealed effect, simultaneously, can alleviate the collision of valve clack and disk seat, increase check valve's life.

In one embodiment, the slider 13 has a larger area at the end of the medium near the valve body inlet 2 than at the end near the valve body outlet 3.

This embodiment provides a way for the slider to interface with the two end media. So set up, then only when the medium pressure of the valve body import one end is bigger to certain value than the medium pressure of the valve body export one end, can promote the motion of sliding block, just can start electromagnetic component. Therefore, the situation that the medium pressure at the two ends of the valve clack is close to each other is avoided, and the diversion assembly moves frequently due to the fluctuation of the medium pressure at the two ends of the valve clack, so that the electromagnetic assembly is prevented from driving the valve clack to be opened and closed continuously. Therefore, the check valve of the embodiment can run more stably and reliably.

In one embodiment, a guide rod 17 is further included, and the guide rod 17 is arranged in the spring 11 and connected with the upper part of the outer wall 8.

The guide rod is arranged in the spring, so that the spring can run more stably.

In one embodiment, the guide rod 17 is provided with an external thread, and one end far away from the movable iron core 10 extends out of the outer wall; the upper part of the outer wall 8 is provided with matched internal threads; the guide rod 17 is rotatable within the outer wall 8 internal thread for axial movement.

Through set up matched with screw on guide arm and outer wall upper portion, then the accessible rotates the guide arm and makes the guide arm along axial motion to can restrict the position that the movable iron core upwards moved, thereby can influence the distance that the valve clack upwards moved, thereby influence the aperture of check valve, thereby the flow of control medium.

In one embodiment, the device further comprises a stepping motor, wherein one end of the guide rod, which is far away from the movable iron core 10, is connected with the stepping motor, and the stepping motor can drive the guide rod 17 to rotate around a shaft; the stepping motor is electrically connected with the PLC system.

This embodiment is a further improvement of the previous embodiment. When the end of the guide rod, far away from the movable iron core 10, is connected with the stepping motor, and the stepping motor is electrically connected with the PLC system, the distance that the valve clack can move upwards can be directly controlled through the PLC system, so that the opening degree of the check valve is controlled to control the medium flow. The control of the medium flow is more accurate due to the use of the stepper motor.

In one embodiment, the PLC system uses Siemens S7-200.

A model of a PLC system is provided.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A check valve, comprising:

the electromagnetic assembly is arranged on the upper part of the valve body assembly; the outer wall of the electromagnetic assembly is connected with the connecting pipe; a coil is arranged in the outer wall; a movable iron core is arranged in the coil; the lower part of the movable iron core is connected with the push rod; a spring is arranged on the upper part of the movable iron core, and the upper part of the spring is connected with the upper part of the outer wall;

2. A check valve as claimed in claim 1 wherein said sliding block is made of polyurethane material, said sliding block having sealing rings disposed at one end and in the middle of the medium adjacent the outlet of the valve body, said conductive block and two said conductive contacts disposed between said sealing rings, said two conductive contacts limiting the range of motion of said sliding block.

3. The check valve of claim 2 wherein said conductive block and said conductive contact are annular.

4. The check valve of claim 1, wherein said circuit switch is a relay, said relay being electrically connected to a PLC system.

5. A check valve as claimed in claim 1, wherein the flap is provided with a gasket on both sides.

6. A check valve as claimed in claim 1 wherein the area of the end of the slide block adjacent the inlet of the valve body is less than the area of the end of the slide block adjacent the outlet of the valve body.

7. The check valve of claim 1, further comprising a guide disposed within said spring and connected to an upper portion of said outer wall.

8. The check valve of claim 7 wherein said pilot stem is externally threaded and an end remote from said plunger extends beyond said outer wall; the upper part of the outer wall is provided with matched internal threads; the guide rod can rotate in the outer wall internal thread so as to move along the axial direction.

9. The check valve of claim 8, further comprising a step motor, wherein an end of the guide rod, which is away from the movable core, is connected to the step motor, and the step motor can drive the guide rod to rotate around the shaft; the stepping motor is electrically connected with the PLC system.

10. A check valve as claimed in claim 4 or claim 9, wherein said PLC system uses siemens S7-200.