Integrated signal feedback device of pneumatic butterfly valve

Abstract

The utility model belongs to the technical field of pneumatic butterfly valves, and particularly relates to a pneumatic butterfly valve integrated signal feedback device which comprises a valve position feedback valve rod, a mechanical position indicator, a magnetic switch, a pneumatic butterfly valve and a control device, the control device comprises a controller, and the pneumatic butterfly valve comprises a valve body and an air cylinder which are assembled. One end of the valve position feedback valve rod is fixedly connected with the air cylinder, the other end of the valve position feedback valve rod is connected with the mechanical position indicator, a magnetic strip is embedded in the mechanical position indicator, and the magnetic switch is installed on one side of the mechanical position indicator and is guided by the magnetic strip in the mechanical position indicator to switch on and off a circuit. The magnetic switch is electrically connected with the controller, the magnetic switch feeds back a circuit signal of the on-off circuit to the controller, and the controller generates a switching signal according to the circuit signal. The problem that in the prior art, due to large vibration of the vacuum pump, an inlet pneumatic butterfly valve is high in operation failure rate can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic butterfly valves, and in particular relates to an integrated signal feedback device for a pneumatic butterfly valve. Background Art

[0002] In the current production process of thermal power plants, the importance of vacuum pumps as key equipment for maintaining the stable operation of the vacuum system is self-evident; the main function of the vacuum pump is to effectively extract the non-condensable and uncondensable gases generated by the condenser during the condensation process to ensure the continuous stability of the vacuum environment in the condenser. Among them, the pneumatic butterfly valve at the inlet of the vacuum pump plays a vital role, and it is the key valve to control the steam extraction process inside the condenser.

[0003] However, during the actual operation of the unit, there is a significant phenomenon: the operating status of the vacuum pump and its inlet pneumatic butterfly valve is not ideal, which is specifically manifested in the high vibration frequency and high vibration speed of the vacuum pump, which not only increases the noise of the equipment operation, but also poses a serious threat to the safety and stability of the equipment; after analysis, in the original signal feedback device, when the pneumatic actuator is directly installed on the inlet pipe of the vacuum pump, it is affected by the high vibration speed for a long time, resulting in serious wear of the splicing design of the feedback device and the cylinder valve position feedback connection shaft; in addition, the micro switch in the feedback device is also damaged due to frequent excessive vibration, which makes the operation interface unable to accurately display the switch status of the pneumatic butterfly valve at the inlet of the vacuum pump. Utility Model Content

[0004] The technical problem solved by the utility model is to provide an integrated signal feedback device for a pneumatic butterfly valve, so as to solve the problem in the prior art that the inlet pneumatic butterfly valve has a high operating failure rate due to the large vibration of the vacuum pump.

[0005] The basic scheme provided by the utility model: an integrated signal feedback device for a pneumatic butterfly valve, comprising a valve position feedback valve stem, a mechanical position indicator, a magnetic switch, a pneumatic butterfly valve and a control device, wherein the control device comprises a controller, the pneumatic butterfly valve comprises an assembled valve body and a cylinder, one end of the valve position feedback valve stem is fixedly connected to the cylinder, and the other end is connected to the mechanical position indicator, a magnetic strip is embedded in the mechanical position indicator, the magnetic switch is installed on one side of the mechanical position indicator, and the circuit is turned on and off under the guidance of the magnetic strip in the mechanical position indicator;

[0006] The magnetic switch is electrically connected to the controller. The magnetic switch feeds back a circuit signal of turning on and off the circuit to the controller. The controller generates a switch signal according to the circuit signal.

[0007] Furthermore, one end of the valve position feedback valve stem extends into the valve hole of the cylinder and is fixed by welding, and the other end is fixed to the mechanical position indicator.

[0008] Furthermore, the mechanical position indicator is in the form of a cylinder with a hollow interior and an open bottom. The hollow interior of the mechanical position indicator is provided with two opposing magnetic stripe slots, and the magnetic strip is located in the magnetic stripe slot. The top of the mechanical position indicator is provided with a raised arrow indicating component in two arrow directions, and the two arrow directions of the arrow indicating component are respectively aligned with the two magnetic stripe slots.

[0009] Furthermore, a reserved hole is provided at the top center of the mechanical position indicator, a reserved screw hole is provided at the top of one end of the valve position feedback valve stem fixing the mechanical position indicator, and the reserved hole on the mechanical position indicator and the reserved screw hole on the valve position feedback valve stem are fixedly connected by bolts.

[0010] Furthermore, it also includes a magnetic switch fixing frame, and the magnetic switch is fixed to one side of the mechanical position indicator on the cylinder through the magnetic switch fixing frame.

[0011] Furthermore, the magnetic switch includes an indicator light.

[0012] Furthermore, the control device further comprises a display module, the display module is electrically connected to the controller, and the controller is further used to control the display module to display the switch signal of the magnetic switch.

[0013] The principle and advantage of the utility model are that the failure of the existing pneumatic butterfly valve at the inlet of the vacuum pump in actual operation is manifested as high vibration frequency and large vibration speed of the vacuum pump. The reason for this kind of problem is that the existing signal feedback device adopts a splicing design, and the valve body, cylinder and echo device of the pneumatic butterfly valve are connected by splicing, resulting in a high vibration frequency of the vacuum pump when the equipment is operating normally. The valve body of the pneumatic butterfly valve at the inlet of the pump and the cylinder are tightly connected by bolts without any problems, while the connection between the echo device and the cylinder adopts a contact connection. Under high-frequency vibration conditions, the connection between the echo device and the cylinder is severely worn, resulting in damage to the signal switch in the echo device.

[0014] To solve this problem, the applicant designed the technical solution of the present application. First, the splicing design of the original signal feedback device was improved to an integrated design, including installing one end of the valve position feedback valve stem in the cylinder and fixing it by welding. Then, the responder in the original signal feedback device adopts a non-contact design, including the technology of combining a magnetic switch and a mechanical position indicator. Finally, through the control device, the magnetic switch can accurately and stably feedback the valve position signal to the user.

[0015] Therefore, the solution of the present application not only effectively solves the damage problem of the original design under high-frequency vibration, but also improves the timeliness, accuracy and stability of signal feedback, reduces the failure rate of equipment during operation, ensures the stable and reliable operation of the pneumatic butterfly valve at the inlet of the vacuum pump, and provides a solid foundation for the stable operation of the vacuum system of the steam turbine of the thermal power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0017] Figure 2 It is a top view schematic diagram of the signal feedback device on the cylinder in the embodiment of the utility model;

[0018] Figure 3 It is an exploded schematic diagram of the signal feedback device and the pneumatic butterfly valve in the embodiment of the utility model;

[0019] Figure 4 For the utility model embodiment Figure 3 A magnified schematic diagram of the marker A;

[0020] Figure 5 This is a schematic diagram of the structure of the valve position feedback valve stem in the embodiment of the utility model;

[0021] Figure 6 It is a structural schematic diagram of a mechanical position indicator in an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods:

[0023] The marks in the drawings of the specification include: cylinder 1, valve body 2, valve position feedback valve stem 3, reserved screw hole 301, mechanical position indicator 4, arrow indicating component 401, magnetic strip slot 402, magnetic strip 403, magnetic switch 5, magnetic switch fixing bracket 6, fixing hole 7.

[0024] Embodiment: First, in view of the fact that the vacuum pump equipment existing in the prior art has an increased failure rate due to high-frequency vibration during operation of the vacuum pump and its inlet pneumatic butterfly valve, the present application conducts an in-depth analysis of the problem to understand its working principle and root cause of the failure, and finds that the original signal feedback device adopts a splicing design, that is, the valve body 2, the cylinder 1 and the responder are connected by splicing. In this type of design, in the operating environment of the vacuum pump with high-frequency vibration, although the valve body 2 and the cylinder 1 are fixed with bolts to ensure that the connection is stable and not loose, the working mode of the original responder requires that it must use a contact connection with the valve position feedback valve stem 3 of the cylinder 1, which causes it to be frequently damaged and becomes the main cause of the failure.

[0025] In order to solve the above problems, the pneumatic butterfly valve integrated signal feedback device of the present application is as follows: Figure 1 , Figure 3 and Figure 4As shown, it includes a valve position feedback stem 3, a mechanical position indicator 4, a magnetic switch 5, a pneumatic butterfly valve and a control device, wherein the pneumatic butterfly valve includes an assembled valve body 2 and a cylinder 1, the valve position feedback stem 3 is installed in the cylinder 1 and fixed by welding, the valve body 2 is installed on the axis of the cylinder 1 and fixed to the main body of the cylinder 1 by bolts, the other end of the valve position feedback stem 3 is connected to the mechanical position indicator 4, a magnetic strip 403 is embedded in the mechanical position indicator 4, the magnetic switch 5 is installed on one side of the mechanical position indicator 4, and the circuit is turned on and off under the guidance of the magnetic strip 403 in the mechanical position indicator 4.

[0026] In this embodiment, in order to solve the problem that the existing signal feedback device of the pneumatic butterfly valve adopts a splicing design, the valve position feedback valve stem 3 of the present application adopts a customized design, and the specific design is as follows: Figure 5 As shown, the length of the valve position feedback valve stem 3 is lengthened relative to the valve position feedback connecting rod in the original signal feedback device. The specific lengthened size is based on the actual required size after welding. For example, in this application, the length of the lengthened valve position feedback valve stem 3 is 159 mm.

[0027] The lengthened valve position feedback valve stem 3 passes through the valve hole on the cylinder 1, and the connection joint surface is fixed by welding. The valve body 2 is then connected to the cylinder 1 by bolts, thereby ensuring that the valve body 2, the cylinder 1 and the valve position feedback valve stem 3 on the pneumatic butterfly valve form a solid integrated structure.

[0028] like Figure 5 and Figure 6 As shown, in order to better fix the mechanical position indicator 4 to the valve position feedback stem 3, a reserved screw hole 301 is opened in the middle of one end where the valve position feedback stem 3 and the mechanical position indicator 4 are fixed, and a reserved hole is opened at the corresponding position on the top of the mechanical position indicator 4. The mechanical position indicator 4 can be fixed to the valve position feedback stem 3 by bolts. When the equipment is operating normally, the cylinder 1 drives the butterfly valve switch through the intake and exhaust, and at the same time drives the valve position feedback stem 3 coaxially installed in the cylinder 1 to rotate, and the mechanical position indicator 4 fixed on the valve position feedback stem 3 also rotates.

[0029] A magnetic strip 403 is provided inside the top of the mechanical position indicator 4. Specifically, Figure 6 As shown, the mechanical position indicator 4 in the present application is in the form of a cylinder with a hollow interior and an open bottom. The hollow interior is provided with relative magnetic stripe slots 402, and the magnetic stripe 403 is located in the magnetic stripe slot 402; the top of the mechanical position indicator 4 is also provided with a raised arrow indicating component 401 in the direction of two arrows, and the two arrow directions of the arrow indicating component 401 are respectively aligned with the two magnetic stripe slots 402; when the valve position feedback valve stem 3 rotates, the mechanical position indicator 4 is driven to rotate, and the arrow indicating component 401 on the mechanical position indicator 4 can effectively show the rotation of the valve position feedback valve stem 3.

[0030] At the same time, the magnetic stripe 403 provided on the mechanical position indicator 4 in the present application is used to link with the magnetic switch 5. Specifically, the pneumatic butterfly valve is provided with a fixing hole 7 of the original signal feedback device. In order to match the valve position feedback valve stem length, the present application makes the mechanical position indicator 4 and the magnetic switch 5 at the same height, and adjusts them by installing a fixing bracket. At the position of the fixing hole 7, a magnetic switch 5 fixing bracket is additionally installed, so that the magnetic switch 5 is fixed to the fixing hole 7 through the magnetic switch fixing bracket 6, and after the magnetic switch 5 is fixed, it includes an arc surface. The spacing requirement between the arc surface and the cylindrical mechanical position indicator 4 is: so that the magnetic switch 5 and the magnetic stripe 403 on the mechanical position indicator 4 have electromagnetic induction, thereby satisfying the magnetic switch 5 to open and close the circuit under the guidance of the magnetic stripe 403 in the mechanical position indicator 4.

[0031] The control device includes a controller and a display module. The pneumatic butterfly valve of the present application can be automatically controlled under the controller. In order to better display the operating status of the pneumatic butterfly valve, the magnetic switch 5 is electrically connected to the controller, and the display module is also electrically connected to the controller. The controller is used to receive the on-off circuit signal of the magnetic switch 5 and generate a switch signal according to the on-off circuit signal. At the same time, the controller also controls the display module to display the switch information. In this way, under user operation, the operating status of the target pneumatic butterfly valve can be known through the display module. At the same time, in order to enhance the status display, an indicator light is set on the magnetic switch 5 to feedback the operating status of the pneumatic butterfly valve, for example Figure 2 As shown, it includes a "fully closed" indicator light and a "fully opened" indicator light. When the arrow direction of the mechanical position indicator 4 is facing the "fully closed" indicator light or the "fully opened" indicator light, a red light will light up to remind the user. Otherwise, the "fully closed" indicator light or the "fully opened" indicator light will not light up.

[0032] In this embodiment, the controller is applied to a 660MW thermal power unit, and is controlled by a computer in a centralized control room using a DCS (distributed control system), and a DELL liquid crystal display is used as a display module.

[0033] The above are only embodiments of the utility model. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, which will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. Pneumatic butterfly valve integrated signal feedback device, characterized by: It includes a valve position feedback valve stem, a mechanical position indicator, a magnetic switch, a pneumatic butterfly valve and a control device, wherein the control device includes a controller, the pneumatic butterfly valve includes an assembled valve body and a cylinder, one end of the valve position feedback valve stem is fixedly connected to the cylinder, and the other end is connected to the mechanical position indicator, a magnetic strip is embedded in the mechanical position indicator, the magnetic switch is installed on one side of the mechanical position indicator, and the circuit is turned on and off under the guidance of the magnetic strip in the mechanical position indicator; The magnetic switch is electrically connected to the controller. The magnetic switch feeds back a circuit signal of turning on and off the circuit to the controller. The controller generates a switch signal according to the circuit signal.

2. The integrated signal feedback device for a pneumatic butterfly valve according to claim 1 is characterized in that: One end of the valve position feedback valve stem extends into the valve hole of the cylinder and is fixed by welding, and the other end is fixed with a mechanical position indicator.

3. The integrated signal feedback device for a pneumatic butterfly valve according to claim 2 is characterized in that: The mechanical position indicator is cylindrical with a hollow interior and an open bottom. Two opposing magnetic stripe slots are provided in the hollow interior of the mechanical position indicator. The magnetic stripe is located in the magnetic stripe slot. A raised arrow indicating component with two arrow directions is provided on the top of the mechanical position indicator. The two arrow directions of the arrow indicating component are respectively aligned with the two magnetic stripe slots.

4. The integrated signal feedback device for a pneumatic butterfly valve according to claim 3 is characterized in that: A reserved hole is provided at the center of the top of the mechanical position indicator, a reserved screw hole is provided at the top of one end of the valve position feedback valve stem fixing the mechanical position indicator, and the reserved hole on the mechanical position indicator and the reserved screw hole on the valve position feedback valve stem are fixedly connected by bolts.

5. The integrated signal feedback device for a pneumatic butterfly valve according to claim 1, characterized in that: It also includes a magnetic switch fixing frame, and the magnetic switch is fixed on one side of the mechanical position indicator on the cylinder through the magnetic switch fixing frame.

6. The integrated signal feedback device for a pneumatic butterfly valve according to claim 1, characterized in that: The magnetic switch includes an indicator light.

7. The integrated signal feedback device for a pneumatic butterfly valve according to claim 1, characterized in that: The control device further comprises a display module, and the display module is electrically connected to the controller. The controller is further used to control the display module to display the switch signal of the magnetic switch.

Images