Anti-reflux flue

Abstract

The utility model provides an anti-backflow flue which comprises a flue body, a baffle A and a baffle B. The baffle A and the baffle B face the same direction, are arranged sequentially at certain intervals and are installed in the flue body, when flue gas flows from left to right, the flue gas can be prevented from flowing, when the direction is opposite, the flue gas flows normally, and the flue is simple in structure, reliable in work, long in service life and suitable for popularization and application. And the combustion efficiency of the boiler is improved, and the emission index is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of heating and ventilation, and in particular relates to an anti-backflow flue. Background Art

[0002] In order to ensure smooth exhaust of flue gas and avoid flue gas backflow, a check valve is usually installed in the flue of boiler equipment. This structure can solve the problem of flue gas backflow to a certain extent. However, since the valve is generally a movable valve plate structure, it is easily corroded, oxidized, damaged, etc. due to long-term exposure to high temperature, smoke and other harsh conditions, resulting in the valve plate being unable to open, preventing the flue gas from being discharged, affecting the combustion efficiency of the boiler, and even causing emissions to exceed the standard. Summary of the invention

[0003] The purpose of the present invention is to provide an anti-backflow flue, which ensures the smooth discharge of boiler combustion flue gas and avoids flue gas backflow. Moreover, since it is a non-active structure with a simple construction, flue blockage will not occur at all, thereby ensuring efficient combustion of the boiler, saving energy and reducing emissions.

[0004] According to one purpose of the present invention, the present invention provides a backflow prevention flue, including a flue, a baffle A, and a baffle B.

[0005] Furthermore, the baffle A and baffle B are in a trumpet shape.

[0006] Furthermore, a circular hole is provided in the center of the baffle A to facilitate airflow.

[0007] Furthermore, a plurality of semicircular holes are provided around the baffle B, and the holes generally should not exceed half of the trumpet-shaped side wall to facilitate airflow.

[0008] Furthermore, a circular hole is provided in the middle of the baffle B. The hole in the middle can be concentric or eccentric, and the hole should not exceed half of the trumpet-shaped side wall as much as possible.

[0009] Furthermore, the baffles A and B have the same bell mouth orientation and are installed in the flue at a certain distance.

[0010] Furthermore, the baffles A and B are arranged in sequence with intervals between them in the flue.

[0011] Furthermore, if the central hole of the baffle plate B is an eccentric hole, the two closest pieces are staggered by 180 degrees as much as possible when the flue is arranged.

[0012] Furthermore, the flue may be a straight tube, a conical tube, a square tube or a special-shaped structure.

[0013] Furthermore, there is no gap between the baffle A and the flue to prevent airflow from passing through. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "inside", "middle", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] Figure 1 is a cross-sectional view of the embodiment of the present invention when the smoke flows in reverse direction;

[0017] Figure 2 is a cross-sectional view of the embodiment of the present invention when the smoke flows in the forward direction;

[0018] Figure 3 is a cross-sectional view of the arrangement of the baffle B when the central hole is eccentric in the embodiment of the present invention;

[0019] Figure 4 is an isometric view of baffle A and baffle B according to an embodiment of the present invention;

[0020] In the figure, 1, flue; 2, baffle A; 3, baffle B. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Figure 1 , Figure 2 , Figure 3 , Figure 4 Shown

[0023] A backflow prevention flue comprises a flue 1, a baffle A2 and a baffle B3.

[0024] like Figure 1As shown, when the present invention works normally, smoke enters from the left side of the flue 1. When the smoke close to the wall of the flue 1 hits the baffle A2, the baffle A2 is an inverted bell mouth and its flow direction is changed by the side wall of the bell mouth. The smoke with changed flow direction will reversely hit the smoke passing through the middle hole of the baffle A2. The impact direction is against the flow direction of the smoke, thereby preventing the flow of the smoke. Even if part of the smoke cannot be stopped, it will continue to flow along the flue 1 through the middle hole of the baffle A2. When it flows through the baffle B3, the baffle B3 will divide the smoke into two parts, one part of which will flow along the baffle B3. The smoke flows out from the semicircular holes around the baffle B3, and the other part flows out along the circular hole in the middle. The smoke flowing out from the semicircular holes around the baffle B3 forms reverse smoke due to the guiding effect of the side wall of the baffle A2. This smoke will impact the smoke flowing out from the circular hole in the middle, forming exhaust resistance and preventing the discharge of smoke. As the smoke flows, the smoke constantly impacts and is blocked between the baffles A2 and B3, and the flow gradually weakens until it stops. It has been confirmed through experiments that when four baffles A2 and three baffles B3 are set in the flue 1, the smoke can be basically completely blocked.

[0025] like Figure 2 As shown, the smoke enters from the right side of the flue 1. No matter when passing through the baffle A2 or the baffle B3, no reverse airflow is generated, and the smoke can pass smoothly.

[0026] In order to enhance the effect of preventing smoke backflow, the center hole of baffle B3 can be designed as an eccentric structure such as Figure 3 and Figure 4 , and when the flue is arranged, the two closest pieces are staggered by 180 degrees as much as possible. At this time, when the smoke passes through the baffle B3, it is staggered with the center hole of the baffle A2, which reduces the amount of smoke passing through the center hole of the baffle A2 and increases the amount of smoke impacting the baffle A2, that is, the flow rate of the reverse airflow is increased, achieving a better anti-backflow effect.

[0027] Finally: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A backflow prevention flue, comprising a flue, a baffle A and a baffle B, characterized in that: The baffles A and B face the same direction and are installed in the flue at a certain distance.

2. The anti-backflow flue according to claim 1, characterized in that: The baffle A and baffle B are in a trumpet shape.

3. The anti-backflow flue according to claim 1, characterized in that: A circular hole is provided in the center of the baffle A.

4. The anti-backflow flue according to claim 1, characterized in that: The baffle B is provided with a plurality of semicircular holes around its periphery.

5. The anti-backflow flue according to claim 1, characterized in that: A circular hole is provided in the middle of the baffle B, and the hole in the middle can be concentric or eccentric.

6. The anti-backflow flue according to claim 1, characterized in that: The baffles A and B are arranged in sequence in the flue, one after the other.

7. The anti-backflow flue according to claim 1, characterized in that: The flue can be a straight tube, a conical tube, a square tube or a special-shaped structure.

8. The anti-backflow flue according to claim 1, characterized in that: There is no gap between the baffle A and the flue to prevent airflow from passing through.

Images