Exhaust fan check valve structure

Abstract

The utility model relates to a related technical field of check valve structure especially, it relates to a kind of air extractor check valve structure, including valve body, the inside fixed mounting of valve body is installed with flap mounting seat, the lower end of flap mounting seat is provided with flap, the front surface fixed mounting of flap mounting seat is provided with shell, the front end of shell is provided with sliding block, the front end fixed mounting of sliding block is provided with connecting rod, the both ends of shell are provided with second sliding slot, the front end of shell is provided with driving wheel, by integrating shell in the front of flap mounting seat, inside setting sliding block, driving wheel, linkage assembly of crank and reset spring, form double drive and limit system, when airflow promotes flap rotation, first locating plate on flap synchronously promotes crank, driving wheel is slid along the bending part of second sliding slot, flap rotating torque is converted into sliding block linear motion by connecting rod, ensure that flap is stably opened to preset angle under low-pressure environment, reduce flow resistance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the check valve structure related technical field, especially a kind of exhaust fan check valve structure. BACKGROUND

[0002] In the fluid control field such as industrial ventilation, ship exhaust and building heating, the key role of exhaust fan check valve is to guarantee one-way flow of airflow, when equipment is running, it needs to reduce flow resistance by structural optimization design to improve efficiency, when equipment is stopped, it needs to be sealed quickly to prevent backflow, for low wind pressure operating environment and complex working conditions such as ship roll, mechanical vibration, check valve faces specific technical requirements in lightweight driving design, opening and closing action precision control and sealing reliability.

[0003] The flap opening relies on fluid pressure to directly overcome gravity or spring resistance, which is prone to high opening threshold and response lag, on the other hand, it lacks precise limit and dynamic stability mechanism, in complex environments such as ship roll and mechanical vibration, the flap is prone to abnormal opening and closing due to gravity deviation or vibration impact, causing sealing failure or backflow risk.

[0004] To solve the above problems, through retrieval, a double-wall pipe exhaust fan outlet check valve with publication number CN 218178017 U is disclosed, which proposes "using lightweight inclined flap, so that the check valve can be completely opened by ventilation pressure when the exhaust fan is running, and the actual ventilation flow rate meets the specification requirements, when the ship rolls, even if the exhaust fan stops running, the flap will not be affected by gravity and automatically open", by tilting the flap, the flap is reset only by its own weight when stopped, if there is oil stain, rust or slight deformation on the inner wall of the valve body, it may cause the flap to jam or not reset in place.

[0005] In view of this, the above problems are studied in depth, and the present case is generated. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing an exhaust fan check valve structure to solve the problem of flap opening relying on fluid pressure to directly overcome gravity or spring resistance, which is prone to high opening threshold and response lag, on the other hand, it lacks precise limit and dynamic stability mechanism, in complex environments such as ship roll and mechanical vibration, the flap is prone to abnormal opening and closing due to gravity deviation or vibration impact, causing sealing failure or backflow risk.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a kind of air extractor check valve structure, the inside of the valve body is fixedly installed with flap mounting seat, the lower end of the flap mounting seat is provided with flap, the front surface of the flap mounting seat is fixedly installed with shell, the front end of the shell is provided with sliding block, the front end of the sliding block is fixedly installed with connecting rod, the both ends of the shell are provided with second sliding slot, the front end of the shell is provided with driving wheel, the rear end of the connecting rod is provided with crank rod, the front end of the crank rod is fixedly installed with first locating plate, the front end of the shell is fixedly installed with second locating plate, the rear end of the sliding block is fixedly installed with connecting block, the rear end of the connecting block is fixedly installed with reset spring, the lower end of the flap mounting seat is fixedly installed with connecting ring, the both ends of the connecting ring are fixedly connected with fixed rod.

[0008] Preferably, the front end of the valve body is fixedly installed with an inlet flange.

[0009] Preferably, the rear end of the valve body is fixedly installed with an outlet flange.

[0010] Preferably, the front end of the shell is provided with a first sliding slot adapted to the sliding block, and the sliding block is connected to the connecting rod through the connecting block.

[0011] Preferably, the crank rod is connected to the shell through the driving wheel, the driving wheel is placed in the second sliding slot, the second sliding slot is provided with a bent portion, and a stop portion is correspondingly provided below the bent portion.

[0012] Preferably, the shell is connected to the connecting block through the reset spring.

[0013] Preferably, the upper end of the flap is fixedly installed with a fixed rod, the connecting ring is connected to the flap through the fixed rod, and the connecting ring and the fixed rod form a rotating structure.

[0014] Compared with the prior art, the utility model has the beneficial effects that: the air extractor check valve structure integrates the shell in front of the flap mounting seat, and sets the linkage assembly of the sliding block, the driving wheel, the crank rod and the reset spring inside, to form a double driving and limiting system. When the airflow drives the flap to rotate, the first locating plate on the flap synchronously drives the crank rod, which drives the driving wheel to slide along the bent portion of the second sliding slot. The rotating torque of the flap is converted into the linear motion of the sliding block through the connecting rod, to amplify the low wind pressure driving force. The flap is stably opened to the preset angle under low pressure environment, to reduce the flow resistance. When the machine stops, the reset spring resets the sliding block through the connecting block, and the driving wheel abuts against the sliding slot stop portion. In combination with the flexible hinged structure of the flap around the fixed rod, the fast and accurate sealing is realized. Through the dynamic limiting and elastic reset mechanism, the influence of vibration and transverse inclination is effectively resisted. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1The overall appearance structure schematic view of the utility model is shown in the figure.

[0016] Figure 2 The mutual cooperation structure schematic view of the flap mounting seat and the flap of the utility model is shown in the figure.

[0017] Figure 3 The mutual cooperation structure schematic view of the shell and the connecting rod of the utility model is shown in the figure.

[0018] Figure 4 The mutual cooperation structure schematic view of the connecting block and the reset spring of the utility model is shown in the figure.

[0019] In the figure: 1, import flange plate; 2, valve body; 3, export flange plate; 4, flap mounting seat; 5, flap; 6, shell; 7, first sliding groove; 8, sliding block; 9, connecting rod; 10, second sliding groove; 11, driving wheel; 12, crank; 13, first positioning plate; 14, second positioning plate; 15, connecting block; 16, reset spring; 17, connecting ring; 18, fixed rod. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] Please refer to Figures 1-4 The utility model provides a kind of technical scheme: a kind of air extractor check valve structure, the inside of valve body 1 is fixedly installed with flap mounting seat 4, the lower end of flap mounting seat 4 is provided with flap 5, the front surface of flap mounting seat 4 is fixedly installed with shell 6, the front end of shell 6 is provided with sliding block 8, the front end of sliding block 8 is fixedly installed with connecting rod 9, the both ends of shell 6 are provided with second sliding groove 10, the front end of shell 6 is provided with driving wheel 11, the rear end of connecting rod 9 is provided with crank 12, the front end of crank 12 is fixedly installed with first positioning plate 13, the front end of shell 6 is fixedly installed with second positioning plate 14, the rear end of sliding block 8 is fixedly installed with connecting block 15, the rear end of connecting block 15 is fixedly installed with reset spring 16, the lower end of flap mounting seat 4 is fixedly installed with connecting ring 17, both ends of connecting ring 17 are all fixedly connected with fixed rod 18.

[0022] Further, the front end of valve body 1 is fixedly installed with import flange plate 2, by the setting of import flange plate 2, the standardized connection interface with ventilation pipeline is built, the quick docking and reliable sealing of check valve and pipeline system are realized.

[0023] Further, the rear end of the valve body 1 is fixedly installed with an outlet flange plate 3, and the outlet flange plate 3 is provided to construct a standardized connection interface with the downstream pipeline, so as to realize efficient docking and sealing reinforcement of the outlet end of the check valve and the ventilation system.

[0024] Further, the front end of the shell 6 is provided with a first sliding groove 7 matched with the sliding block 8, and the sliding block 8 is connected with the connecting rod 9 through the connecting block 15. The first sliding groove 7 is provided to constrain the movement direction of the sliding block 8.

[0025] Further, the curved rod 12 is connected with the shell 6 through the driving wheel 11, the driving wheel 11 is arranged in the second sliding groove 10, the second sliding groove 10 is provided with a bending part, and a stop part is arranged below the bending part. The driving wheel 11 is arranged to form a movement track of the driving wheel 11 with the bending part and the stop part in the second sliding groove 10. When the flap 5 is opened to a preset angle, the driving wheel 11 reaches the top end of the bending part, and the curved rod 12 is locked in a rigid support state to prevent the flap from being excessively opened due to airflow pulsation.

[0026] Further, the shell 6 is connected with the connecting block 15 through the reset spring 16. The reset spring 16 is arranged to release the pre-tightening force when the exhaust fan is stopped, and the connecting block 15 pulls the sliding block 8 to quickly reset along the first sliding groove 7.

[0027] Further, the upper end of the flap 5 is fixedly installed with a fixed rod 18, and the connecting ring 17 is connected with the flap 5 through the fixed rod 18. The connecting ring 17 and the fixed rod 18 form a rotating structure. The connecting ring 17 is arranged to enable the flap 5 to freely rotate around the fixed rod 18.

[0028] Working principle: when the exhaust fan is running, the airflow enters the valve body 1 from the inlet flange plate 2, pushes the flap 5 to rotate upward around the fixed rod 18, the first positioning plate 13 at the front end of the flap 5 synchronously pushes the curved rod 12, the driving wheel 11 slides along the bending part of the second sliding groove 10, the connecting rod 9 drives the sliding block 8 to translate backward in the first sliding groove 7 and stretch the reset spring 16, until the driving wheel 11 reaches the top end of the bending part, locks the opening angle of the flap 5, realizes stable opening under low wind pressure and reduces the flow resistance, when the exhaust fan is stopped, the reset spring 16 releases the stored energy, the connecting block 15 pulls the sliding block 8 to reset forward, the driving wheel 11 falls back along the bending part and abuts against the stop part, the curved rod 12 pushes the first positioning plate 13 to press the flap 5 to the sealing surface in the inner cavity of the valve body 1, and the flexible hinged structure of the connecting ring 17 and the fixed rod 18 realizes fast and accurate sealing. Under complex working conditions such as high-frequency vibration, the mechanical limiting of the driving wheel 11 and the constant thrust of the reset spring 16 offset the gravity component and the vibration load, so as to ensure the gapless sealing of the flap.

[0029] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A check valve structure for an exhaust fan, comprising a valve body (1), characterized in that: A flap mounting seat (4) is fixedly installed on the inner side of the valve body (1). A flap (5) is provided at the lower end of the flap mounting seat (4). A housing (6) is fixedly installed on the front surface of the flap mounting seat (4). A slider (8) is provided at the front end of the housing (6). A connecting rod (9) is fixedly installed at the front end of the slider (8). A second sliding groove (10) is provided at both ends of the housing (6). A drive wheel (11) is provided at the front end of the housing (6). A crank (12) is provided at the rear end of the connecting rod (9). A first positioning plate (13) is fixedly installed at the front end of the crank (12). A second positioning plate (14) is fixedly installed at the front end of the housing (6). A connecting block (15) is fixedly installed at the rear end of the slider (8). A return spring (16) is fixedly installed at the rear end of the connecting block (15). A connecting ring (17) is fixedly installed at the lower end of the flap mounting seat (4). A fixing rod (18) is fixedly connected through both ends of the connecting ring (17).

2. The structure of a check valve for an exhaust fan according to claim 1, characterized in that: An inlet flange (2) is fixedly installed at the front end of the valve body (1).

3. The structure of a check valve for an exhaust fan according to claim 1, characterized in that: An outlet flange (3) is fixedly installed at the rear end of the valve body (1).

4. The structure of a check valve for an exhaust fan according to claim 1, characterized in that: The front end of the housing (6) is provided with a first groove (7) that is adapted to the slider (8), and the slider (8) and the connecting rod (9) are connected by a connecting block (15).

5. The structure of a check valve for an exhaust fan according to claim 1, characterized in that: The crank (12) is connected to the housing (6) via a drive wheel (11). The drive wheel (11) is placed in the second slide groove (10). The second slide groove (10) is provided with a bending part, and a stop part is provided below the bending part.

6. The structure of a check valve for an exhaust fan according to claim 1, characterized in that: The housing (6) and the connecting block (15) are connected by a return spring (16).

7. The structure of a check valve for an exhaust fan according to claim 1, characterized in that: A fixing rod (18) is fixedly installed on the upper end of the flap (5). The connecting ring (17) is connected to the flap (5) through the fixing rod (18). The connecting ring (17) and the fixing rod (18) form a rotating structure.

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