Roof fan check valve

Abstract

The utility model relates to the field of check valves, in particular to a check valve of a roof fan. The roof fan check valve comprises a valve body, a bearing seat is arranged on the outer side of the valve body, a rotating shaft is installed on the bearing seat, valve plates are installed on the rotating shaft, a stop lever, a flow guide plate and a rain baffle are arranged on the inner side of the valve body, the rain baffle is located above the junction of the two valve plates, the valve plates and the stop lever are arranged in a matched mode, and the flow guide plate and the rain baffle are arranged in a matched mode. A drain hole is formed in the bottom of the valve body. The utility model provides a check valve of a roof fan. The check valve can prevent gas backflow and rain, reduce ventilation resistance, simplify an original structure and reduce cost.

Description

Technical Field

[0001] The utility model relates to the field of check valves, and particularly relates to a check valve for a roof fan. Background Art

[0002] Roof ventilation is an important part of building design, which plays an important role in improving the indoor environment, enhancing the living comfort, and saving energy and reducing emissions. The airflow of the roof exhaust fan is from bottom to top. In order to prevent gas backflow, a check valve is usually set. In order to prevent rainwater from entering the room on rainy days, a wind cap needs to be set at the outlet, which increases the cost. The design of the wind cap may also increase the resistance of the ventilation system to a certain extent, especially in the case of large wind resistance, which may affect the ventilation effect. This may lead to a decrease in the efficiency of indoor and outdoor air exchange and require a larger fan power to overcome this resistance. Summary of the Invention

[0003] The utility model hopes to provide a check valve for a roof fan, and the specific scheme is as follows:

[0004] A check valve for a roof fan, comprising a valve body, a bearing seat is arranged outside the valve body, a rotating shaft is installed on the bearing seat, a valve plate is installed on the rotating shaft, a stop rod, a guide plate and a rain shield are arranged inside the valve body, the rain shield is located above the junction of two valve plates, the valve plate is arranged in cooperation with the stop rod, and a drain hole is arranged at the bottom of the valve body.

[0005] A buffer pad I is arranged on the stop rod.

[0006] A buffer pad II is arranged on the contact surface of the valve body and the valve plate.

[0007] The stop rod limits the valve plate to ensure that the maximum opening and closing angle of the valve plate is 80°.

[0008] The lowest position of the valve plate forms an angle of 15° with the horizontal plane.

[0009] The utility model provides a check valve for a roof fan, which can prevent gas backflow, prevent rain, reduce ventilation resistance, simplify the original structure and reduce the cost. Brief Description of the Drawings

[0010] Figure 1 is the structural schematic diagram of a check valve for a roof fan of the utility model Figure 1 ;

[0011] Figure 2 is the structural schematic diagram of a check valve for a roof fan of the utility model Figure 2 ;

[0012] Figure 3 is Figure 2 the enlarged view of part A;

[0013] Figure 4 Structural schematic of a check valve for a roof fan of the present utility model Figure 3 ;

[0014] Figure 5 Is Figure 4 An enlarged view of part B;

[0015] Wherein the reference numerals: 1. Valve body; 2. Bearing seat; 3. Stop bar; 4. Valve disc; 5. Rotating shaft; 6. Deflector; 7. First buffer pad; 8. Rain shield; 9. Second buffer pad. Specific implementation mode

[0016] The following is further described in conjunction with Figures 1-5 :

[0017] A bearing seat 2 is provided on the outer side of the valve body 1, a rotating shaft 5 is installed on the bearing seat 2, and a valve disc 4 is installed on the rotating shaft 5.

[0018] A stop bar 3, a deflector 6, and a rain shield 8 (the rain shield 8 is located above the junction of the two valve discs 1) are provided inside the valve body 1, and a first buffer pad 7 is provided on the stop bar 3. A second buffer pad 9 is provided on the contact surface of the valve body 1 with the valve disc 4.

[0019] When the fan below the check valve exhausts air upwards, the valve disc 4 opens upwards due to the action of the air flow. When the valve disc 4 touches the stop bar 3, it stops rotating. At this time, the opening angle of the valve disc 4 is 80°.

[0020] When the fan below the check valve stops operating, the valve disc 4 closes downwards due to the action of gravity. When the valve disc 4 touches the valve body 1, it stops rotating.

[0021] When the check valve is closed, the valve disc 4 forms an angle of 15° with the horizontal plane. When it rains, the rainwater flows along the valve disc 4 to the bottom of the valve body 1. A drain hole is provided at the bottom of the valve body 1 to drain the accumulated water.

[0022] Since the wind cap is cancelled, the structure is simplified, the cost is reduced, the ventilation resistance brought by the wind cap is reduced, and the power of the fan can be reduced.

[0023] A stop bar 3 is provided inside the valve body 1 to make the opening angle of the valve disc 4 not exceed 80°, ensuring the air passing area and preventing the valve disc 4 from rotating excessively and causing back-and-forth shaking.

[0024] A first buffer pad 7 is provided on the stop bar 3 to reduce the impact between the valve disc 4 and the stop bar 3 when the fan starts.

[0025] A second buffer pad 9 is provided on the contact surface between the valve body 1 and the valve disc 4 to reduce the impact between the valve disc 4 and the valve body 1 when the fan stops.

[0026] Inside the valve body 1, there is a flow guide plate 6 to ensure that the air flow can smoothly flow towards the valve plate 4.

[0027] Inside the valve body 1, there is a rain shield to ensure that rainwater does not flow through the gaps between the valve plates 4.

[0028] When the check valve is closed, the valve plate 4 forms an angle of 15° with the horizontal plane to ensure that rainwater can flow down along the valve plate 4.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A roof fan check valve, characterized in that: It includes a valve body, a bearing seat is provided on the outer side of the valve body, a rotating shaft is installed on the bearing seat, a valve plate is installed on the rotating shaft, a baffle rod, a guide plate and a rain shield are provided on the inner side of the valve body, the rain shield is located above the junction of two valve plates, the valve plate is matched with the baffle rod, and a drainage hole is provided at the bottom of the valve body.

2. A roof fan check valve according to claim 1, characterized in that: A buffer pad 1 is arranged on the baffle bar.

3. A roof fan check valve according to claim 1, characterized in that: A second buffer pad is provided on the contact surface of the valve body with the valve plate.

4. A roof fan check valve according to claim 1, characterized in that: The lever limits the valve plate to ensure that the maximum opening and closing angle of the valve plate is 80°.

5. A roof fan check valve according to claim 1, characterized in that: The lowest position of the valve plate forms an angle of 15° with the horizontal plane.

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