A dust-proof butterfly valve, a dust-proof butterfly valve system and a powder material conveying system

Abstract

The application provides a dust-proof butterfly valve, a dust-proof butterfly valve system and a powder material conveying system. The dust-proof butterfly valve comprises a valve body of a butterfly valve, a signal detection unit, a control unit and an execution unit. The signal detection unit is used for detecting the closing state of the valve body. The control unit is configured to output a control signal when receiving a valve closing signal sent by the signal detection unit, and control the execution unit to switch between a first state and a second state. The execution unit comprises a solenoid valve and a purge nozzle. When the execution unit is in the first state, the solenoid valve is used to provide a gas path for the purge nozzle to perform directional purging on the valve seat and the valve plate sealing area of the valve body within a preset time length. In the second state, the solenoid valve is used to close the gas path for the purge nozzle to purge the valve seat and the valve plate sealing area of the valve body. The dust-proof butterfly valve realizes immediate directional purging after the valve is closed, automatic air stop, removal of the powder particles before they are agglomerated, and prevention of powder adhesion and agglomeration.

Description

Technical Field

[0001] This application relates to the technical field of powder material conveying, and in particular to an anti-powder-dropping butterfly valve, an anti-powder-dropping butterfly valve system, and a powder material conveying system. Background Technology

[0002] In powder material conveying systems, after the butterfly valve used for unloading is closed, powder easily adheres to and accumulates on its valve plate and valve body sealing surface, forming stubborn lumps. When the mechanical vibration generated by downstream equipment (such as a high-speed disperser) is transmitted to the valve, these adhered powder lumps will fall off and mix into the main batch of material, causing product contamination, uneven content, and quality defects.

[0003] Traditional butterfly valves often have valve plates (usually made of metal or ordinary stainless steel) with insufficient surface smoothness or inherently sticky materials, making them highly susceptible to adhesion of micron-sized fine powders (such as kaolin or titanium dioxide powder). During valve operation (opening / closing), the valve plate simply rotates, failing to actively scrape or clean any adhering powder, leading to continuous powder accumulation. Therefore, this application provides an anti-powder-falling butterfly valve, an anti-powder-falling butterfly valve system, and a powder material conveying system. Utility Model Content

[0004] The purpose of this application is to provide an anti-powder-falling butterfly valve, an anti-powder-falling butterfly valve system, and a powder material conveying system to solve the above-mentioned technical problems.

[0005] The objective of this application is achieved through the following technical solution: In a first aspect, this application provides an anti-powder-shedding butterfly valve, including a valve body, a signal detection unit, a control unit, and an execution unit; the signal detection unit is used to detect the closed state of the valve body; the control unit is configured to output a control signal when it receives a valve closed signal from the signal detection unit, and control the execution unit to switch between a first state and a second state; The execution unit includes a solenoid valve and a purge nozzle. The solenoid valve is used to receive the control signal, and the purge nozzle is installed at a position targeting the valve seat and valve plate sealing area of ​​the valve body. When the execution unit is in a first state, the solenoid valve is used to provide an air path for the purge nozzle to perform directional purge of the valve seat and valve plate sealing area of ​​the valve body within a preset time. In a second state, the solenoid valve is used to close the air path for the purge nozzle to purge the valve seat and valve plate sealing area of ​​the valve body.

[0006] In some optional embodiments, the valve body has an air inlet at its inlet end, or at least one set of air inlets symmetrically arranged. Each air inlet has a purge nozzle positioned directly opposite the sealing area of ​​the valve seat and valve plate. The air inlet end of each purge nozzle is connected to the outlet of the solenoid valve via an air pipe.

[0007] In some optional embodiments, the solenoid valve is a two-position three-normally closed solenoid valve, with its inlet connected to an air source, its outlet connected to the purge nozzle, and a silencer installed at the exhaust port.

[0008] In some alternative embodiments, the signal detection unit includes a position sensor mounted on the valve body for detecting whether the valve is closed.

[0009] In some alternative embodiments, the control unit includes a timer relay, which is a power-on delay type timer relay.

[0010] In some optional embodiments, the trigger terminal of the timer relay is connected to the signal output terminal of the position sensor, and the output terminal of the timer relay is connected in series to the coil power supply circuit of the solenoid valve.

[0011] In some alternative embodiments, the valve closing signal is a 12VDC, 24VDC, or 36VDC electrical signal.

[0012] Secondly, this application also provides an anti-powder-shedding butterfly valve system, including the anti-powder-shedding butterfly valve as described in any one of the first aspects, and further including a power source and an air source; the power source provides power to the control unit and solenoid valve of the anti-powder-shedding butterfly valve; the air source is used to provide compressed air to the purging nozzle through the solenoid valve.

[0013] Thirdly, this application also provides a powder material conveying system, including the anti-powder-dropping butterfly valve system described in the second aspect, and a material conveying pipeline; the anti-powder-dropping butterfly valve system includes an anti-powder-dropping butterfly valve, a power supply and an air source, the inlet end of the anti-powder-dropping butterfly valve is connected to the material receiving end of the material conveying pipeline through a soft protective cover, and its outlet end is connected to the receiving device through the downstream pipeline of the material conveying pipeline.

[0014] In some alternative embodiments, the two ends of the flexible protective cover are connected to the material inlet of the material conveying pipeline and the valve body by clamps to form a sealed channel.

[0015] Based on the above technical solutions and the technical problems solved, the technical solution to be protected in this application involves a signal detection unit sensing the closed state of the valve when the butterfly valve is closed and sending a signal to the control unit. Upon receiving the signal, the control unit outputs a control signal to energize the solenoid valve of the actuator, thereby opening the air path and directing the purging nozzle, aimed at the valve seat and valve plate sealing area of ​​the valve body, to perform directional purging for a preset time. Then, the control unit de-energizes the solenoid valve, closing the air path and stopping the purging. The entire process is automated and requires no manual intervention. The purging nozzle is positioned directly against the valve seat and valve plate sealing area, and the jet is used to peel off powder particles, achieving the highest peeling efficiency under the same air pressure, reducing compressed air waste. When the control signal disappears, the solenoid valve immediately closes the air path, preventing continuous purging that could lead to powder overflow or exhaustion of compressed air, and avoiding situations where the button is accidentally pressed and forgotten to close the valve.

[0016] Its advantages and positive effects are as follows: the provided anti-powder butterfly valve does not deal with the powder by adhering and clumping and then dislodging it through vibration, but achieves immediate directional purging and automatic air stop after the valve is closed, removing the powder before it clumps together, thus realizing automatic cleaning after the butterfly valve is closed. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of an anti-powder-shedding butterfly valve provided in an embodiment of this application; Figure 2 This is a structural block diagram of an anti-powder-shedding butterfly valve system provided in an embodiment of this application; Figure 3 This is a structural block diagram of a powder material conveying system provided in an embodiment of this application.

[0019] Illustration: 100, Anti-powder butterfly valve system; 110, Anti-powder butterfly valve; 111, Valve body; 112, Air inlet; 120, Power supply; 130, Air source; 200, Material conveying pipeline; 300, Soft protective cover. Detailed Implementation

[0020] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0021] This application provides an anti-powder-dropping butterfly valve, which includes a valve body, a signal detection unit, a control unit, and an execution unit. The signal detection unit is used to detect the closed state of the valve body. The control unit is configured to output a control signal when it receives a valve closed signal from the signal detection unit, thereby controlling the execution unit to switch between a first state and a second state. The execution unit includes a solenoid valve and a purge nozzle. The solenoid valve is used to receive the control signal, and the purge nozzle is installed at a position targeting the valve seat and valve plate sealing area of ​​the valve body. When the execution unit is in a first state, the solenoid valve is used to provide an air path for the purge nozzle to perform directional purge of the valve seat and valve plate sealing area of ​​the valve body within a preset time. In a second state, the solenoid valve is used to close the air path for the purge nozzle to purge the valve seat and valve plate sealing area of ​​the valve body.

[0022] When the butterfly valve body is closed, the signal detection unit senses the closed state and sends a signal to the control unit. Upon receiving the signal, the control unit outputs a control signal to energize the solenoid valve of the actuator, thereby opening the air path. The purge nozzle, aimed at the valve seat and valve plate sealing area, performs directional purging for a preset time. Then, the control unit de-energizes the solenoid valve, closing the air path and stopping the purging. The entire process is automated and requires no manual intervention. The purge nozzle is directly positioned over the valve seat and valve plate sealing area; the jet is used to strip powder particles, achieving the highest stripping efficiency under the same air pressure, reducing compressed air waste. When the control signal disappears, the solenoid valve immediately closes the air path, preventing continuous purging that could lead to powder overflow or exhaustion of compressed air, and avoiding situations where the valve is forgotten to be turned off manually.

[0023] Therefore, the provided anti-powder butterfly valve can achieve immediate directional purging and automatic air stop after the valve is closed, removing powder particles before they clump together, instead of removing them by vibration after they have adhered and clumped. This achieves automatic cleaning after the butterfly valve is closed, effectively preventing powder adhesion and clumping, thereby reducing product contamination and quality defects.

[0024] In some embodiments, the solenoid valve is a two-position three-normally closed solenoid valve, with its inlet connected to an air source, its outlet connected to the purge nozzle, and a silencer installed at the exhaust port.

[0025] The two-position finger valve core has two working positions—the de-energized position and the energized position; the three-position finger has three air ports: P (inlet, connected to the air source), A (outlet, connected to the nozzle), and R (exhaust port, open to the atmosphere).

[0026] When the control unit outputs a control signal (e.g., 24VDC), the solenoid valve coil is energized, and the valve core is attracted by electromagnetic force, switching to the energized position. At this time, the P port and A port of the solenoid valve are connected. Compressed air flows from the air source to the P port, then to the A port, and finally to the purging nozzle, forming a directional high-speed airflow that precisely purifies the sealing area between the valve seat and the valve plate. When the delay ends, the control signal is disconnected: the solenoid valve is de-energized, and the valve core resets under the action of the spring force; it returns to the normally closed state, the P port and A port are disconnected, and the A port and R port are connected; the air source is cut off, and the residual air pressure at the nozzle end is quickly released through the R port, and the purging immediately stops. A muffler is installed at the R port to reduce exhaust noise; at the same time, it acts as a filter barrier, preventing dust from the environment from entering the air path.

[0027] Therefore, the normally closed design avoids continuous jetting due to abnormal control signals or power outages. At the end of the purging process, the residual pressure at port A is released instantaneously through port R, ensuring precise and controllable purging time.

[0028] In some embodiments, the valve body has an air inlet at its inlet end, or at least one set of air inlets symmetrically arranged. Each air inlet has a purge nozzle positioned directly opposite the sealing area of ​​the valve seat and valve plate. The air inlet end of each purge nozzle is connected to the outlet of the solenoid valve via an air pipe.

[0029] As an example, see Figure 1 The inlet end of the valve body 111 of the anti-powder butterfly valve 110 is connected to the material conveying pipeline 200 through a soft protective cover 300. The inlet end is provided with at least one air inlet 112, or one or more sets of air inlets 112 can be symmetrically arranged. Each air inlet 112 is provided with a purge nozzle positioned directly opposite the sealing area of ​​the valve seat and valve plate.

[0030] In some embodiments, the signal detection unit includes a position sensor mounted on the valve body for detecting whether the valve is closed.

[0031] Position sensors can be inductive or magnetic proximity switches, and are encapsulated to prevent dust accumulation; the cable shield of the position sensor can be grounded at one end to avoid signal interference.

[0032] Therefore, by directly sensing the physical closure status through position sensors, rather than estimating the closure status over time, it is ensured that each valve closure is accompanied by a cleaning process.

[0033] In some embodiments, the control unit includes a timer relay, which is a power-on delay type timer relay. A single power-on delay type relay is low in cost and easy to implement. The delay length is adjustable on-site to suit different powders.

[0034] In some embodiments, the trigger terminal of the timing relay is connected to the signal output terminal of the position sensor, and the output terminal of the timing relay is connected in series to the coil power supply circuit of the solenoid valve.

[0035] As an example, the output contact of the position sensor is electrically connected to the trigger terminal of a timer relay; the output contact of the timer relay is connected in series with the coil power supply circuit of a two-position three-normally closed solenoid valve; the coil power supply is 24VDC. The timer relay coil is energized only when the sensor sends a signal that the valve is closed, and its internal timer immediately begins accumulating (e.g., 10s). During the timing period, the output contact remains closed, the solenoid valve remains energized, and the purging nozzle continuously sprays air; after the preset delay (10s), the output contact automatically opens, the solenoid valve is de-energized and resets, and the purging ends. If the valve closes again, the above process repeats; if the sensor signal disappears (the valve opens midway), the timer relay is immediately de-energized and resets, the output contact momentarily opens, and the purging stops.

[0036] Therefore, the structure, which stops upon power failure and has no holding circuit, ensures that even if the coil signal is abnormally lost, the solenoid valve will immediately reset, eliminating the risk of continuous gas consumption and dust emission. It requires no MCU or software deployment, relying solely on hardware relay logic, resulting in low cost.

[0037] In some implementations, the valve closing signal is a 12VDC, 24VDC, or 36VDC electrical signal.

[0038] The output signal is a universal 12VDC, 24VDC or 36VDC level, eliminating the need for an additional power supply or DC / DC converter, and can directly drive the electrical components in the control unit.

[0039] See Figure 2 This application also provides an anti-powder-shedding butterfly valve system 100, including the anti-powder-shedding butterfly valve 110 as described in any of the above embodiments, and further including a power supply 120 and an air source 130; the power supply 120 provides power to the control unit and solenoid valve of the anti-powder-shedding butterfly valve; the air source 130 is used to provide compressed air to the purging nozzle through the solenoid valve.

[0040] To facilitate understanding, the technical solution protected in this application will be illustrated through an example.

[0041] This example provides an anti-powder butterfly valve system, including an anti-powder butterfly valve, a power supply 120, and a pneumatic supply 130. The anti-powder butterfly valve integrates a mechanism that automatically removes potentially adhering substances during each valve closure process, preventing powder from accumulating and forming hard lumps.

[0042] The pneumatic purging system is controlled by a timer relay. Upon receiving a closed signal from the butterfly valve, the relay immediately triggers an output, which drives a two-position three-way solenoid valve to switch direction, thus opening the air path and allowing compressed air from air source 130 to enter the purging nozzle to perform the purging operation. Simultaneously, the timer relay starts its internal timer, automatically cutting off the output after a preset 30-second delay, resetting the solenoid valve, closing the air path, and stopping the purging. The system then enters standby mode, awaiting the next butterfly valve closed signal.

[0043] The control unit includes a timing relay, which receives signals from the position sensor, supplies power 120V to the solenoid valve, and controls the on-time. It is an on-delay type, meaning that the output starts upon power-on and automatically disconnects after a delay.

[0044] The actuator includes a solenoid valve, a purge nozzle, and an air hose connector. The solenoid valve (2-position 3-way, normally closed) switches the air path according to the instructions of a timer relay. Normally closed means that when power is lost, the outlet is connected to the exhaust port, disconnected from the air source 130 port, and there is no air output. The purge nozzle focuses compressed air into a high-speed airflow, precisely blowing it onto the valve seat and valve plate sealing area; the material can be brass, stainless steel, or plastic. The air hose connector is used for connecting components. Power supply 120 is a 24VDC switching power supply, and air source 130 is a compressed air system.

[0045] The position sensor is mechanically mounted on the butterfly valve body, with its sensing head aligned with a triggerable position on the valve stem or actuator. Electrically, its signal output line is connected to the trigger signal input terminal of a timing relay.

[0046] In the electrical connection of the timer relay, its output contacts are connected in series in the coil power supply circuit of the solenoid valve to receive signals from the position sensor and control the energization and de-energization of the solenoid valve.

[0047] For the air circuit connection of the solenoid valve, its inlet (P port) is connected to the air source 130 after the filter and pressure reducing valve through an air pipe; the outlet (A port) is connected to the purge nozzle; and a silencer is installed at the exhaust port (R port). For the electrical connection, its coil lead is connected to the output terminal of the timing relay.

[0048] The purging nozzle is mechanically installed at the outlet (port A) of the solenoid valve via an air tube and connector. Its physical position ensures that the nozzle orifice is directly opposite the valve seat and valve plate sealing area where powder is most likely to accumulate, in order to achieve the best purging effect.

[0049] As another example, the workflow of the anti-powder-shedding butterfly valve system in the previous example is provided: Triggering phase: Butterfly valve closing signal → generates an electrical signal (such as 24VDC) and sends it to the timing relay.

[0050] Start-up and timing phase: Upon receiving the signal, the timer relay immediately engages, supplying power to the solenoid valve coil. The solenoid valve then reverses direction, allowing compressed air to flow from port P to port A, ultimately exiting through the purge nozzle to begin purging. Simultaneously, the timer relay begins its internal 30-second countdown.

[0051] Hold and purge phase: For the next 30 seconds, the solenoid valve remains energized, and purging continues to ensure thorough removal of any adhering powder.

[0052] Stop and Reset Phase: After 30 seconds, the timer relay automatically cuts off the output, and the solenoid valve coil is de-energized. The solenoid valve resets under the action of the spring, cutting off the air supply 130 (P port closed), and connecting the nozzle end (A port) to the exhaust port (R port) to discharge residual air pressure. Purge stops.

[0053] Standby phase: The system returns to its initial state and waits for the next butterfly valve closing signal. The entire process repeats continuously.

[0054] The technical solution provided in this example uses the closure of the butterfly valve as the sole trigger source, eliminating manual intervention for the purging action and thus forming a closed-loop control system that ensures cleaning with each valve closure. The control layer employs a timed relay logic that activates upon power and automatically stops after a delay, achieving a fully automated, fixed-duration, and highly repeatable purging process. The execution layer precisely aligns the nozzle with the valve seat sealing surface and the area around the rotating shaft—the most powder-accumulating areas—allowing for the directional release of compressed air energy for effective removal. The electrical, pneumatic, and mechanical components are integrated into a single system design. Nozzle-side pressure is rapidly released through a silencer, achieving lag-free shutdown. Even for short-cycle, high-frequency valve operations (such as multiple openings and closings per minute), rapid reset is possible without interfering with the next cycle.

[0055] See Figure 1 and Figure 3 This application embodiment also provides a powder material conveying system, including the anti-powder-falling butterfly valve system 100 described above, and a material conveying pipeline 200; the anti-powder-falling butterfly valve system 100 includes an anti-powder-falling butterfly valve, a power supply and an air source, the inlet end of the anti-powder-falling butterfly valve is connected to the material receiving end of the material conveying pipeline 200 through a soft protective cover 300, and its outlet end is connected to the receiving device through the downstream pipeline of the material conveying pipeline 200.

[0056] In some embodiments, the two ends of the soft protective cover 300 are connected to the material inlet of the material conveying pipeline and the valve body by clamps to form a sealed channel.

[0057] As an example, the soft protective cover 300 is a conductive anti-static flexible hose, with clamps at both ends forming a sealed channel with the material conveying pipeline 200 and the valve body of the anti-powder-falling butterfly valve. It can move synchronously with the disassembly and assembly of the anti-powder-falling butterfly valve to prevent dust from escaping and eliminate static electricity accumulation. The power supply provides a safe voltage of 12-36 VDC to the position sensor, timer relay and solenoid valve of the anti-powder-falling butterfly valve. The air source provides clean compressed air of 0.4-0.6MPa after passing through a pressure reducing filter triplet for directional purging. Thus, the powder material conveying system automatically performs a precise purging for a preset duration after each valve closure, preventing powder adhesion and agglomeration and avoiding subsequent powder fall pollution, achieving high cleanliness and continuous operation in the conveying process.

[0058] It should be noted that in the embodiments of this application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple. It is worth noting that "at least one" can also be interpreted as "one or more".

[0059] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are configured to distinguish similar objects and are not necessarily configured to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0060] This application describes the invention from the perspectives of purpose, performance, progress, and novelty, and it meets the functional enhancement and use requirements emphasized by the Patent Law. The above description and drawings are merely preferred embodiments of this application and are not intended to limit this application. Therefore, all structures, devices, features, etc., that are similar to or identical to those of this application, i.e., all equivalent substitutions or modifications made in accordance with the scope of this patent application, shall fall within the scope of protection of this patent application.

Claims

1. A butterfly valve for preventing powder from falling off, characterized in that, The device includes a butterfly valve body, a signal detection unit, a control unit, and an execution unit; the signal detection unit is used to detect the closed state of the valve body; the control unit is configured to output a control signal when it receives a valve closed signal from the signal detection unit, thereby controlling the execution unit to switch between a first state and a second state. The execution unit includes a solenoid valve and a purge nozzle. The solenoid valve is used to receive the control signal, and the purge nozzle is installed at a position targeting the valve seat and valve plate sealing area of ​​the valve body. When the execution unit is in a first state, the solenoid valve is used to provide an air path for the purge nozzle to perform directional purge of the valve seat and valve plate sealing area of ​​the valve body within a preset time. In a second state, the solenoid valve is used to close the air path for the purge nozzle to purge the valve seat and valve plate sealing area of ​​the valve body.

2. The anti-powder-shedding butterfly valve according to claim 1, characterized in that, The solenoid valve is a two-position, three-position normally closed solenoid valve. Its inlet is connected to the air source, its outlet is connected to the purge nozzle, and a silencer is installed at the exhaust port.

3. The anti-powder-shedding butterfly valve according to claim 2, characterized in that, The valve body has an air inlet at its inlet end, or at least one set of air inlets symmetrically arranged. Each air inlet has a purge nozzle positioned directly opposite the sealing area of ​​the valve seat and valve plate. The air inlet end of each purge nozzle is connected to the outlet of the solenoid valve via an air pipe.

4. The anti-powder-dropping butterfly valve according to claim 1, characterized in that, The signal detection unit includes a position sensor, which is installed on the valve body and is used to detect whether the valve is closed.

5. The anti-powder-shedding butterfly valve according to claim 4, characterized in that, The control unit includes a timer relay, which is a power-on delay type timer relay.

6. The anti-powder-shedding butterfly valve according to claim 5, characterized in that, The trigger terminal of the timing relay is connected to the signal output terminal of the position sensor, and the output terminal of the timing relay is connected in series to the coil power supply circuit of the solenoid valve.

7. The anti-powder-shedding butterfly valve according to claim 5, characterized in that, The valve closing signal is a 12VDC, 24VDC, or 36VDC electrical signal.

8. A butterfly valve system for preventing powder shedding, characterized in that, The anti-powder-shedding butterfly valve according to any one of claims 1-7 further includes a power source and an air source; the power source provides power to the control unit and solenoid valve of the anti-powder-shedding butterfly valve; the air source is used to provide compressed air to the purging nozzle through the solenoid valve.

9. A powder material conveying system, characterized in that, The anti-powder-falling butterfly valve system according to claim 8 further includes a material conveying pipeline; the anti-powder-falling butterfly valve system includes an anti-powder-falling butterfly valve, a power supply and an air source, the inlet end of the anti-powder-falling butterfly valve is connected to the material receiving end of the material conveying pipeline through a soft protective cover, and its outlet end is connected to the receiving device through the downstream pipeline of the material conveying pipeline.

10. The powder material conveying system according to claim 9, characterized in that, The two ends of the soft protective cover are connected to the material inlet of the material conveying pipeline and the valve body by clamps to form a sealed channel.

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