A type of air supply valve

Abstract

This utility model relates to a make-up air valve, comprising: a valve body with a connection portion for connecting to a pipeline; a fixed filter portion fixedly disposed within the valve body, having a filter channel that allows airflow and intercepts impurities; and a movable filter portion coaxially disposed with the fixed filter portion and capable of rotating relative to the fixed filter portion, the movable filter portion also having a filter channel that allows airflow and intercepts impurities; a drive mechanism transmits rotational motion to the movable filter portion via a transmission mechanism, allowing the filter channels of the movable and fixed filter portions to be continuously adjustable between overlap and offset, achieving linear proportional control of the make-up air volume and rotation angle. This utility model, through the rotational cooperation of the fixed and movable filter portions, ensures a linear relationship between the ventilation cross-sectional area and the rotation angle, accurately controlling the amount of make-up air volume and guaranteeing system stability; the two filter portions always overlap throughout the adjustment range, forming continuous double filtration of the airflow, achieving dual functions in a single structure, and reducing costs.

Description

Technical Field

[0001] This utility model relates to the field of pipeline fluid control technology, and in particular to a make-up air valve. Background Technology

[0002] In high-speed conveying systems for powders or flue gas in industries such as chemical, papermaking, medical, and municipal solid waste incineration, make-up air valves are usually installed at the end or middle of the pipeline to maintain the necessary airflow velocity, reduce pressure drop, and prevent blockage.

[0003] The most widely used make-up air valve structures in existing technologies are butterfly valves and lift valves. A typical butterfly valve consists of a circular valve body and a butterfly-shaped valve plate that can rotate around a central axis. The ventilation cross-sectional area is adjusted by changing the angle between the valve plate and the airflow direction, thus achieving airflow compensation. However, in practical use, it has been found that butterfly valves control airflow by rotating the valve plate, while lift valves control airflow intermittently by moving the valve stem up and down. Both have certain limitations in practical applications. For example, butterfly valves require a separate filter at the inlet, which is costly. The compensated airflow varies significantly with the valve plate's rotation angle, making accurate control difficult. Lift valves, on the other hand, have a more complex structure, higher maintenance costs, and also require a separate filter. The compensated airflow is intermittently controlled by the up-and-down movement of the valve plate, which is also difficult to control accurately. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a make-up air valve that can linearly adjust the air volume, realize the integration of filtration and make-up air, maintain low pressure loss and simplify the structure and eliminate maintenance.

[0005] To solve the above-mentioned technical problems, this utility model provides an air supply valve for compensating air volume and filtering airflow in a delivery pipeline, comprising: The valve body is equipped with a connection part for connecting to the pipeline; A fixed filter section is fixedly installed in the valve body and has a filter channel that allows airflow to pass through and can intercept impurities. A movable filter section is coaxially arranged with the fixed filter section and can rotate relative to the fixed filter section. The movable filter section has a filter channel that allows airflow to pass through and can intercept impurities. The drive mechanism outputs rotational motion; the drive mechanism transmits the rotational motion to the movable filter section through the transmission mechanism, so that the filter channels of the movable filter section and the fixed filter section are continuously adjustable between overlapping and offset, thereby realizing linear proportional control of the air supply volume and the rotation angle, and maintaining the filtration function throughout the entire adjustment range.

[0006] In one embodiment of the utility model, the valve body is a flange, and the connecting part is a flange interface.

[0007] In one embodiment of the utility model, the fixed filter part is an arc-shaped baffle welded to the bottom of the flange.

[0008] In one embodiment of the utility model, the movable filter part is an arc-shaped, gate-like valve plate symmetrical to the shape of the baffle. The valve plate achieves the overlap or intersection of the filter channels by rotating relative to the baffle.

[0009] In one embodiment of the present invention, a protrusion is provided at the bottom of the outer periphery of the valve plate, and the protrusion overlaps with the baffle.

[0010] In one embodiment of this utility model, a gap is provided between the outer circumference of the valve plate and the inner wall of the flange to avoid rotational interference.

[0011] In one embodiment of this utility model, the transmission mechanism includes a transmission shaft sleeve and a valve shaft. The transmission shaft sleeve is welded to the top of the valve plate. One end of the valve shaft is connected to the drive mechanism, and the other end is provided with a square opening that fits into the inner square opening of the transmission shaft sleeve to realize rotational transmission.

[0012] In one embodiment of this utility model, a gasket is also included, which is disposed between the valve shaft and the transmission shaft sleeve and is used to adjust the axial clearance between the valve plate and the baffle.

[0013] In one embodiment of this utility model, the gasket has an inner square and outer circle structure.

[0014] In one embodiment of this utility model, the drive mechanism includes an actuator and an actuator base; the actuator base is welded to the top of the valve body, and the actuator is fixed to the actuator base by bolts.

[0015] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects: The make-up air valve of this utility model achieves a linear relationship between the ventilation cross-sectional area and the rotation angle through the rotational cooperation of the fixed filter section and the movable filter section, accurately controlling the amount of compensated air volume and ensuring the stability of the system. The two filter sections always overlap throughout the adjustment range, forming a continuous double filtration of the airflow, eliminating the need for an independent filter, realizing dual functions of a single structure, and reducing costs. When fully open, the channels are completely overlapped with no obstructions, and the pressure loss approaches zero. The entire system consists only of the valve body, two filter sections, and a rotary drive, reducing the number of parts, eliminating axial seals, and achieving high reliability and maintenance-free operation. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1 This is a three-dimensional structural diagram of the air supply valve in a preferred embodiment of the present invention; Figure 2 for Figure 1 A three-dimensional structural diagram of the make-up air valve from another angle; Figure 3 for Figure 1 The side view of the make-up air valve shown; Figure 4 for Figure 1 The diagram shows the exploded structure of the make-up air valve; Figure 5 This is a schematic diagram of the valve shaft, positioning bushing, transmission bushing, flange, baffle, and valve plate in this invention. Figure 6 for Figure 5 Cross-sectional view along the BB direction; Figure 7 for Figure 1 A schematic diagram of the valve shaft of the make-up air valve shown; Figure 8 for Figure 1 A schematic diagram of the gasket structure of the make-up air valve is shown; Explanation of the markings on the attached drawings: 1. Flange; 2. Baffle; 3. Positioning bushing; 4. Actuator; 5. Actuator base; 6. Valve plate; 7. Gasket; 8. Drive shaft bushing; 9. Bolt; 10. Valve shaft. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0018] Reference Figure 1-6 As shown, this utility model provides a make-up air valve for compensating air volume and filtering airflow in a delivery pipeline. It includes: a valve body with a connecting part for connecting to the pipeline; the valve body is a flange 1, and the connecting part 11 is a flange interface. The flange 1 can be directly connected to the existing flange of the pipeline, and installation, disassembly and maintenance do not require modification of the pipeline. A fixed filter section is fixedly installed in the valve body and has a filter channel that allows airflow to pass through and can intercept impurities; the fixed filter section is an arc-shaped baffle 2 welded to the bottom of the flange 1.

[0019] The movable filter section is coaxially arranged with the fixed filter section and can rotate relative to the fixed filter section. The movable filter section has a filter channel that allows airflow and intercepts impurities. The movable filter section is an arc-shaped, gate-like valve plate 6 symmetrical to the shape of the baffle 2. The valve plate 6 and the baffle 2 form a valve. The valve plate 6 rotates relative to the baffle 2 to make the filter channel overlap or cross, thereby opening and closing the valve and controlling the air supply volume. This air supply volume is linearly proportional to the switching angle, which facilitates accurate control of the air supply volume and ensures the stability of the system. Both the valve plate 6 and the baffle 2 are symmetrical arc-shaped gates that can completely overlap or cross during rotation, resulting in a smooth and stepless change in the flow area, ensuring linear airflow adjustment. The homogeneous grid also evenly distributes the airflow and reduces airflow impact noise.

[0020] The drive mechanism outputs rotational motion; the drive mechanism transmits the rotational motion to the movable filter section through a transmission mechanism, allowing the filter channels of the movable filter section and the fixed filter section to be continuously adjustable between overlapping and offset, thereby achieving linear proportional control of the make-up air volume and rotation angle, and maintaining the filtration function throughout the adjustment range. The drive mechanism includes an actuator 4 and an actuator base 5; the actuator base 5 is welded to the top of the flange 1, and the actuator 4 is fixed to the actuator base 5 by bolts 9. The transmission mechanism includes a transmission shaft sleeve 8 and a valve shaft 10; the transmission shaft sleeve 8 is welded to the top of the valve plate 6; one end of the valve shaft 10 is connected to the drive mechanism, and the other end has a square opening that fits into the inner square opening of the transmission shaft sleeve 8 to achieve rotational transmission. The structure of the valve shaft 10 is as follows: Figure 7 As shown.

[0021] Furthermore, a positioning bushing 3 is welded and fixed below the baffle 2 in the opposite direction. The positioning bushing 3 is used to position the rotation center of the valve shaft 10.

[0022] Based on the above structure, the air supply valve rotates by the actuator 4, which drives the valve shaft 10, transmission shaft sleeve 8, valve plate 6 and other components to rotate together. The arc-shaped gate structure of valve plate 6 and the arc-shaped gate structure of baffle 2 begin to overlap or cross each other, thereby opening and closing the air supply valve and controlling the air supply volume.

[0023] Furthermore, a shim 7 is provided between the valve shaft 10 and the transmission shaft sleeve 8 to adjust the axial clearance between the valve plate 6 and the baffle 2. The design of the shim 7 prevents air leakage caused by shaking and avoids excessive tightness that increases friction, ensuring long-term stable and low-torque operation of the valve plate 6. The shim 7 can also adjust the clearance between the small protrusion at the bottom of the circumference of the valve plate 6 and the plane of the baffle 2, avoiding an excessively large clearance that would cause the valve plate 6 to shake during rotation, and also avoiding an excessively small clearance that would increase the friction between the small protrusion at the bottom of the circumference of the valve plate 6 and the plane of the baffle 2, ensuring that the valve plate 6 rotates stably to adjust the air supply volume.

[0024] like Figure 8As shown, the gasket 7 has an inner square and outer circle structure. The inner square and outer circle gasket 7 serves both axial positioning and circumferential anti-rotation functions, and can be installed in one step during assembly, simplifying the process and improving assembly consistency.

[0025] Furthermore, the bottom of the outer circumference of the valve plate 6 is provided with a protrusion that overlaps with the baffle 2. This transfers the large-area friction between the valve plate 6 and the baffle 2 to the small protrusion at the bottom of the outer circumference of the valve plate 6 and the baffle 2, thus avoiding direct friction between the arc-shaped gate structure of the valve plate 6 and the arc-shaped gate structure of the baffle 2, which could cause structural damage, increase friction, or even jamming and valve malfunction.

[0026] It should be noted that a gap is provided between the outer circumference of the valve plate 6 and the inner wall of the flange 1 to avoid rotational interference.

[0027] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A make-up air valve for compensating for air volume and filtering air flow in a duct, characterized in that, include: The valve body is equipped with a connection part for connecting to the pipeline; A fixed filter section is fixedly installed in the valve body and has a filter channel that allows airflow to pass through and intercepts impurities; A movable filter section is coaxially arranged with the fixed filter section and can rotate relative to the fixed filter section. The movable filter section has a filter channel that allows airflow to pass through and intercepts impurities. The drive mechanism transmits rotational motion to the movable filter section through a transmission mechanism, so that the filter channels of the movable filter section and the fixed filter section can be continuously adjusted between overlapping and offset, thereby achieving linear proportional control of the make-up air volume and the rotation angle.

2. The air bypass valve of claim 1, wherein The valve body is a flange, and the connection part is a flange interface.

3. The air bypass valve of claim 2, wherein The fixed filter section is an arc-shaped baffle welded to the bottom of the flange.

4. The air bypass valve of claim 3, wherein The movable filter section is an arc-shaped, barn-like valve plate symmetrical to the shape of the baffle. The valve plate achieves the overlap or intersection of the filter channels by rotating relative to the baffle.

5. The air bypass valve of claim 4, wherein The valve plate has a protrusion at the bottom of its circumference, and the protrusion overlaps with the baffle.

6. The air bypass valve of claim 5, wherein A gap is provided between the outer circumference of the valve plate and the inner wall of the flange to avoid rotational interference.

7. The air bypass valve of claim 6, wherein The transmission mechanism includes a transmission shaft sleeve and a valve shaft. The transmission shaft sleeve is welded to the top of the valve plate. One end of the valve shaft is connected to the drive mechanism, and the other end is provided with a square opening that fits into the inner square opening of the transmission shaft sleeve to achieve rotational transmission.

8. The overfire damper as defined in claim 7, wherein It also includes a gasket, which is disposed between the valve shaft and the transmission shaft sleeve, and is used to adjust the axial clearance between the valve plate and the baffle.

9. The overfire damper as defined in claim 8, wherein: The gasket has an inner square and an outer round structure.

10. The overfire damper valve of claim 1, wherein, The drive mechanism includes an actuator and an actuator base; the actuator base is welded to the top of the valve body, and the actuator is fixed to the actuator base by bolts.

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