Anti-backflow structure of range hood

Abstract

The utility model provides an anti-backflow structure of a range hood, and relates to the technical field of anti-backflow structures. One end of the rear side of the connecting pipe is inserted into the wall body, and the connecting pipe is communicated with a smoke exhaust pipeline in the wall body. Through the arrangement of the fan, the fan synchronously rotates to realize auxiliary air exhaust when the range hood is started, so that smoke backflow and backflow are avoided; according to the anti-backflow device, through the arrangement of the anti-backflow assembly, after the anti-backflow assembly is damaged, the two fixing bolts can be directly detached, the seat body can be taken out from the connecting pipe to be replaced, and the maintenance cost is saved; through the arrangement of the connecting pipe, the connecting pipe is of a bent pipe structure, and one end of the rear side of the connecting pipe faces downwards, in the using process, smoke generated by other users can be prevented from entering a room through the connecting pipe, and the problem that although an existing device can achieve smoke blocking and backward flowing prevention through a baffle, the smoke cannot enter the room is solved. However, if the baffle is damaged, the smoke can not be blocked, and auxiliary smoke suction and backflow prevention can not be achieved through improvement.

Description

Technical Field

[0001] The utility model belongs to the technical field of anti-backflow structures, and more specifically, particularly relates to an anti-backflow structure of an oil fume extractor. Background Technique

[0002] The oil fume extractor, also known as a range hood, is a kitchen appliance for purifying the kitchen environment. It is installed above the kitchen stove and can quickly extract the waste generated by the stove combustion and the harmful oil fumes produced during the cooking process and discharge them outdoors. Currently, the entire floor shares a smoke exhaust pipe, and it is easy for the smoke to enter the indoor of other floors when other users on the floor are cooking. Therefore, an anti-backflow structure is needed for protection.

[0003] Although the existing device can block the backflow of smoke through a baffle, if the baffle is damaged, it will not be able to block the flue gas, and it cannot be improved to achieve auxiliary smoking and anti-backflow. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides an anti-backflow structure of an oil fume extractor to solve the problem that although the existing device can block the backflow of smoke through a baffle, if the baffle is damaged, it will not be able to block the flue gas, and it cannot be improved to achieve auxiliary smoking and anti-backflow.

[0005] The purpose and effect of an anti-backflow structure of an oil fume extractor of the utility model are achieved by the following specific technical means:

[0006] An anti-backflow structure of an oil fume extractor includes a connecting pipe; one end at the rear side of the connecting pipe is inserted into the wall body, and the connecting pipe is communicated with the smoke exhaust pipe in the wall body.

[0007] Further, a fan is fixed inside the connecting pipe, and the fan is electrically connected to the start switch of the oil fume extractor.

[0008] Further, an annular auxiliary sleeve is sleeved on the connecting pipe. The auxiliary sleeve is made of rubber and is used for connecting with the exhaust pipe of the oil fume extractor.

[0009] Further, a fixing component is installed on the connecting pipe. The fixing component is composed of a fixing seat, fixing screws and elastic blocks. A fixing seat is welded on the connecting pipe, and four fixing screws are inserted into the fixing seat. The four fixing screws are threadedly connected with the expansion nuts in the wall body.

[0010] Further, an elastic block with the same box shape as the fixing seat is adhered to the bottom end surface of the fixing seat. The connecting pipe and the fixing screws both pass through the elastic block, and the elastic block is made of rubber.

[0011] Further, an anti-backflow component is installed in the connecting pipe. The anti-backflow component is composed of a seat body, a fixing block, a baffle plate, a spring hinge and a fixing bolt. The seat body is fixed in the connecting pipe by two fixing bolts. The seat body is of an annular structure, and the outer wall of the seat body contacts the inner wall of the connecting pipe.

[0012] Further, a fixing block is welded to the bottom end surface of the seat body. Two baffle plates are rotatably connected to the fixing block through two spring hinges. Both baffle plates are of a semi-circular structure, and both baffle plates contact the bottom end surface of the seat body, and the connecting pipe is in a sealed state.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] In this application, through the setting of the fan, the switch on the panel of the range hood is pressed to start the fan. When the fan rotates, auxiliary air extraction is realized, and the backflow of flue gas is avoided when the fan rotates. And when the baffle plate is damaged, anti-backflow can be realized through the rotation of the fan.

[0015] In this application, through the setting of the anti-backflow component, after the anti-backflow component is damaged, the two fixing bolts can be directly removed and the seat body can be taken out from the connecting pipe for replacement, saving the maintenance cost.

[0016] In this application, through the setting of the auxiliary sleeve, after the exhaust pipe of the range hood is sleeved on the auxiliary sleeve, a clamp is used for fixing. At this time, the auxiliary sleeve is compressed, which can improve the sealing performance at the connection between the exhaust pipe of the range hood and the connecting pipe, avoid the leakage of flue gas, and has good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an axonometric structural view of the anti-backflow structure of the range hood of the utility model.

[0018] Figure 2 is a front view structural view of the anti-backflow structure of the range hood of the utility model.

[0019] Figure 3 is an axonometric structural view of the anti-backflow structure of the range hood of the utility model after being partially cut open.

[0020] Figure 4 is the Figure 3 axonometric structural view after rotation of the utility model.

[0021] Figure 5 is the Figure 4 enlarged structural view of part A of the utility model.

[0022] Figure 6 is an axonometric structural view of the anti-backflow component of the utility model.

[0023] In the figure, the corresponding relationship between the component names and the drawing reference numerals is as follows:

[0024] 1. Connecting pipe; 101. Auxiliary sleeve;

[0025] 2. Fan;

[0026] 3. Fixing component; 301. Fixing base; 302. Fixing screw; 303. Elastic block;

[0027] 4. Anti-backflow component; 401. Seat body; 402. Fixing block; 403. Baffle; 404. Spring hinge; 405. Fixing bolt. Detailed implementation mode

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings of the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the described embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present utility model.

[0029] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the field to which the present utility model belongs. The words such as "a", "one" or "the" used in the description of the present utility model patent application specification and claims do not indicate a limitation in quantity, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents. "Connection" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships, and when the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0030] The following further describes in detail the implementation mode of the present utility model in conjunction with the drawings and embodiments.

[0031] Embodiment 1:

[0032] As shown in Figure 1 to Figure 6 shown:

[0033] The present utility model provides an anti-backflow structure for a range hood, including a connecting pipe 1; one end at the rear side of the connecting pipe 1 is inserted into the wall body, and the connecting pipe 1 is communicated with the smoke exhaust pipe in the wall body.

[0034] Among them, a fan 2 is fixed inside the connecting pipe 1. The fan 2 is electrically connected to the control switch on the range hood panel. Press the switch on the range hood panel to start the fan 2. When the fan 2 rotates, it realizes auxiliary air extraction, and when the fan 2 rotates, it can avoid the backflow of flue gas.

[0035] Among them, an auxiliary sleeve 101 with an annular structure is sleeved on the connecting pipe 1. The auxiliary sleeve 101 is made of rubber. The auxiliary sleeve 101 is used to connect with the exhaust pipe of the range hood. After the exhaust pipe of the range hood is sleeved on the auxiliary sleeve 101, a clamp is used for fixation. At this time, the auxiliary sleeve 101 is compressed, which can improve the sealing performance at the connection between the exhaust pipe of the range hood and the connecting pipe 1 and avoid the leakage of flue gas.

[0036] Among them, a fixing component 3 is installed on the connecting pipe 1. The fixing component 3 is composed of a fixing seat 301, fixing screws 302 and elastic blocks 303. A fixing seat 301 is welded on the connecting pipe 1. Four fixing screws 302 are inserted into the fixing seat 301. The four fixing screws 302 are threadedly connected with the expansion nuts in the wall.

[0037] Among them, an elastic block 303 with the same box shape as the fixing seat 301 is adhered to the bottom end surface of the fixing seat 301. The connecting pipe 1 and the fixing screws 302 both pass through the elastic block 303. The elastic block 303 is made of rubber. After the fixing screws 302 are tightened, the elastic block 303 is compressed. At this time, the sealing electrical performance between the fixing seat 301 and the wall can be improved, and the leakage of flue gas from the fixing seat 301 can be avoided.

[0038] Among them, an anti-backflow component 4 is installed inside the connecting pipe 1. The anti-backflow component 4 is composed of a seat body 401, a fixing block 402, a baffle 403, a spring hinge 404 and a fixing bolt 405. The seat body 401 is fixed inside the connecting pipe 1 through two fixing bolts 405. The seat body 401 is of an annular structure. The outer wall of the seat body 401 contacts the inner wall of the connecting pipe 1. After the anti-backflow component 4 is damaged, the two fixing bolts 405 can be directly removed to take out the seat body 401 from the connecting pipe 1 for replacement, saving the maintenance cost.

[0039] Embodiment 2:

[0040] On the basis of Embodiment 1, a fixing block 402 is welded to the bottom end surface of the seat body 401. Two baffle plates 403 are rotated on the fixing block 402 through two spring hinges 404. The two baffle plates 403 are both of a semi-circular structure. The two baffle plates 403 both contact the bottom end surface of the seat body 401. The connecting pipe 1 is in a sealed state. During use, the flue gas discharged by the range hood blows open the two baffle plates 403. At this time, the smoke exhaust is realized. When the range hood stops working, the two baffle plates 403 are reset under the action of the spring hinges 404 to complete the sealing of the connecting pipe 1 and avoid the backflow of flue gas.

[0041] Working principle: During installation, insert the connecting pipe 1 into the smoke exhaust pipe in the wall, and ensure that the rear end of the connecting pipe 1 faces downward. Use four fixing screws 302 to fix the fixing seat 301 on the wall. Sleeve the smoke exhaust pipe of the range hood on the auxiliary sleeve 101 and fix it with a clamp. After tightening the fixing screws 302, the elastic block 303 is compressed. At this time, the sealing electrical performance between the fixing seat 301 and the wall can be improved, avoiding the leakage of smoke from the fixing seat 301. When exhausting smoke, start the range hood, press the switch on the range hood panel to start the fan 2, and realize auxiliary air extraction when the fan 2 rotates. At the same time, the smoke discharged by the range hood blows open the two baffles 403, and at this time, smoke exhaust is realized. When the range hood stops working, the two baffles 403 reset under the action of the spring hinge 404 to complete the sealing of the connecting pipe 1. When the anti-backflow component 4 is damaged, the two fixing bolts 405 can be directly removed and the seat body 401 can be taken out from the connecting pipe 1 for replacement.

[0042] Although the present application has been described with reference to the above embodiments, those skilled in the art will understand that various changes can be made without departing from the concept and scope of the present application as defined by the appended claims. Although this specification contains many details of specific implementation manners, these should not be construed as limitations on the scope claimed by the present application, but rather as descriptions of features specific to particular embodiments. The scope of the present application is defined by the appended claims and their equivalents, and is not limited to the embodiments described above.

Claims

1. A backflow prevention structure for a range hood, characterized in that: It comprises a connecting pipe (1); one end of the rear side of the connecting pipe (1) is inserted into the wall, and the connecting pipe (1) is connected to the smoke exhaust pipe in the wall; a fan (2) is fixed in the connecting pipe (1), and the fan (2) is electrically connected to the start switch of the range hood.

2. The backflow prevention structure of a range hood according to claim 1, characterized in that: An auxiliary sleeve (101) with an annular structure is sleeved on the connecting pipe (1); the auxiliary sleeve (101) is made of rubber material and is used to be connected to the exhaust pipe of the range hood.

3. The backflow prevention structure of a range hood as claimed in claim 2, characterized in that: The connecting pipe (1) is provided with a fixing assembly (3), the fixing assembly (3) being composed of a fixing seat (301), a fixing screw (302) and an elastic block (303); a fixing seat (301) is welded to the connecting pipe (1), four fixing screws (302) are plugged into the fixing seat (301), and the four fixing screws (302) are threadedly connected to expansion nuts in the wall.

4. The backflow prevention structure of a range hood as claimed in claim 3, characterized in that: An elastic block (303) having the same box shape as the fixing seat (301) is adhered to the bottom end surface of the fixing seat (301), and the connecting pipe (1) and the fixing screw (302) both pass through the elastic block (303), and the elastic block (303) is made of rubber.

5. The backflow prevention structure of a range hood as claimed in claim 4, characterized in that: The connecting pipe (1) is provided with an anti-backflow component (4), the anti-backflow component (4) being composed of a seat body (401), a fixing block (402), a baffle (403), a spring hinge (404) and a fixing bolt (405); the seat body (401) is fixed in the connecting pipe (1) by two fixing bolts (405); the seat body (401) is an annular structure, and the outer wall of the seat body (401) is in contact with the inner wall of the connecting pipe (1).

6. The backflow prevention structure of a range hood as claimed in claim 5, characterized in that: The bottom end surface of the seat body (401) is welded with a fixed block (402), and two baffles (403) are rotatable on the fixed block (402) via two spring hinges (404). Both baffles (403) are semicircular structures, and both baffles (403) are in contact with the bottom end surface of the seat body (401), so that the connecting pipe (1) is in a sealed state.

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