A distance measuring device and distance measuring method for a lifting range hood

Abstract

The present invention discloses a distance measuring device for a lifting range hood, comprising: a housing; a fan, arranged in the housing; a smoke collecting chamber, arranged in the housing; a detection mechanism, used to horizontally detect whether there is an obstruction; a horizontal telescopic rod, provided with the detection mechanism, which can be telescoped in the horizontal direction and used to drive the detection mechanism to move back and forth in the horizontal direction; a vertical telescopic rod, connecting the smoke collecting chamber and the horizontal telescopic rod, which can be telescoped in the vertical direction and used to extend vertically downward until the detection mechanism detects the obstruction; a driving mechanism, arranged in the housing and connected to the smoke collecting chamber, used to limit the distance by which the smoke collecting chamber is driven to descend according to the vertical distance between the smoke collecting chamber and the obstruction detected by the detection mechanism. The present invention also discloses a distance measuring method. The beneficial effects of the present invention are that the accuracy of distance measurement can be improved and the detection density of obstructions can be increased.

Description

Technical Field

[0001] The present invention relates to a distance measuring device and a distance measuring method for a lifting range hood, and is applied in the technical field of kitchen appliances. Background Art

[0002] A lift range hood is one with a smoke collection chamber that can be raised and lowered. By adjusting the position of the smoke collection chamber, the distance between the smoke collection chamber and the pot can be reduced during oil fume extraction, improving the extraction effect. The smoke collection chamber can also be retracted when not in use, reducing the size of the range hood for easier operation. Due to user cooking needs, the types of pots used in existing stoves are becoming increasingly complex. When using a range hood with a liftable smoke collection chamber, the smoke collection chamber can easily collide with the pot during its descent. However, the irregular shape of the pot can lead to inaccurate measurements when measuring the pot's height.

[0003] In a prior art application for a lift range hood, the device comprises a housing; a smoke collection chamber that can extend out of the housing to a set distance and fully retract into the housing; and a distance detection assembly mounted on the housing. The distance detection assembly can move horizontally, vertically, and / or diagonally to detect the height of an object below the housing, and the smoke collection chamber is configured to adjust its extension distance based on the height of the object below. In this prior art, the detection mechanism (detection assembly) employs a top-down detection method, which not only requires a large coverage area and complex distance measurement logic, resulting in low distance measurement efficiency, but also makes it difficult to detect the pot wall, resulting in insufficient distance measurement accuracy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a distance measuring device and a distance measuring method for a lifting range hood, which can improve the accuracy of distance measurement and increase the detection density of obstructions.

[0005] The present invention is achieved through the following technical solutions.

[0006] A distance measuring device for a lifting range hood, comprising:

[0007] chassis;

[0008] A fan is arranged in the casing;

[0009] A smoke collecting chamber is arranged in the casing;

[0010] A detection mechanism, used for horizontally detecting whether there is an obstruction;

[0011] A horizontal telescopic rod, provided with the detection mechanism, can be extended and retracted in the horizontal direction, and is used to drive the detection mechanism to move back and forth in the horizontal direction;

[0012] A vertical telescopic rod, connecting the smoke collecting chamber and the horizontal telescopic rod, can be telescoped in the vertical direction and is used to extend vertically downward until the detection mechanism detects an obstruction;

[0013] The driving mechanism is disposed in the housing and connected to the smoke collecting chamber, and is used to limit a distance by which the smoke collecting chamber is driven to descend according to a vertical distance between the smoke collecting chamber and the obstruction detected by the detecting mechanism.

[0014] As a further improvement of the present invention, the reciprocating telescopic speed of the horizontal telescopic rod is greater than the vertical downward extending speed of the vertical telescopic rod.

[0015] As a further improvement of the present invention, at least one detection mechanism is provided and is located on the side of the stove head.

[0016] As a further improvement of the present invention, the horizontal telescopic direction of the horizontal telescopic rod and the length direction of the stove are staggered with each other.

[0017] As a further improvement of the present invention, the detection mechanism includes at least one sensor arranged on the horizontal telescopic rod, and the sensor can emit a horizontal linear detection light beam to detect whether there is an obstruction.

[0018] As a further improvement of the present invention, the horizontal straight line detection light beam emitted by the sensor can pass through the center lines of all the stove heads under the reciprocating extension and contraction of the horizontal telescopic rod.

[0019] As a further improvement of the present invention, the sensor is configured as an infrared sensor.

[0020] A distance measurement method, comprising the steps of:

[0021] Step S1: The vertical telescopic rod extends vertically downward, and the horizontal telescopic rod synchronously reciprocates in the horizontal direction, and the detection mechanism continuously detects whether there is an obstruction in the horizontal direction;

[0022] Step S2: the detection mechanism detects the obstruction in the horizontal direction and obtains the vertical distance d2 between the smoke collecting chamber and the obstruction;

[0023] Step S3: the vertical telescopic rod is retracted vertically upward, and the driving mechanism drives the smoke collecting chamber to descend a distance d3, d3 = d2 - d4, and d4 is a preset safety distance.

[0024] As a further improvement of the present invention, step S2: if the detection mechanism detects an obstruction in the horizontal direction before the vertical telescopic rod is vertically extended downward to the maximum stroke s1, then the vertical telescopic rod vertically extended downward distance d5 = d2.

[0025] As a further improvement of the present invention, if the detection mechanism does not detect an obstruction in the horizontal direction when the vertical telescopic rod is vertically extended downward to the maximum stroke distance s1, the driving mechanism drives the smoke collection chamber to continue to descend until the detection mechanism detects an obstruction, at which time d2 = s1.

[0026] A distance measurement method, comprising the steps of:

[0027] Step S1: The vertical telescopic rod is vertically extended downward by a distance d4, where d4 is a preset safety distance;

[0028] Step S2: the driving mechanism drives the smoke collecting chamber to continuously descend, the horizontal telescopic rod synchronously reciprocates and retracts in the horizontal direction, and the detection mechanism continuously detects whether there is an obstruction in the horizontal direction;

[0029] Step S3: the detection mechanism detects an obstruction in the horizontal direction, the driving mechanism stops driving the smoke collecting chamber, and the vertical telescopic rod retracts vertically upward.

[0030] Beneficial effects of the present invention:

[0031] 1. Based on the horizontal detection mechanism of the detection mechanism, the detection mechanism can detect and identify the pot regardless of whether the pot is covered or not, which improves the accuracy of distance measurement;

[0032] 2. The horizontal telescopic rod can drive the detection mechanism to move back and forth in the horizontal direction, upgrading the detection mechanism's "line" detection to "surface" detection, thereby improving the detection density of the detection mechanism;

[0033] 3. Based on the horizontal detection mechanism of the detection mechanism, the detection coverage area can be narrowed and the detection area can be detected even to the edge of the stove, thereby expanding the detection area. In addition, the detection density of the detection mechanism is increased by the horizontal telescopic rod, thereby expanding the actual detection range of the detection mechanism.

[0034] 4. The detection mechanism is driven by a vertical telescopic rod to move vertically downward and continuously detect. When a pot or other obstruction is detected, the distance measurement is completed. The distance measurement logic is simple and easy to execute, which improves the efficiency of distance measurement.

[0035] 5. Based on the horizontal detection mechanism and the positioning of the detection mechanism, the detection direction is sideways to the oil smoke wind direction. This can not only reduce the interference of oil smoke on the detection, but also avoid direct contact between the detection mechanism and the oil smoke, thereby preventing the formation of dirt on the detection mechanism;

[0036] 6. The detection mechanism based on the detection structure and the reciprocating extension of the horizontal telescopic rod has the characteristics of high detection density and large detection range. It is suitable for application environments with large stoves, diverse obstructions on the stoves, and complex obstruction locations. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the objects and advantages of the present invention, wherein:

[0038] Figure 1 This is a front view of the range hood distance measuring device;

[0039] Figure 2 This is a side view of the range hood distance measuring device. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and implementation examples.

[0041] In this specification, directional terms such as up, down, left, right, front, back, front, back, top, and bottom, which are mentioned or may be mentioned, are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these or other directional terms should not be construed as restrictive.

[0042] Implementation Case 1

[0043] Reference Figure 1 、 Figure 2 A range hood distance measuring device includes a housing 1, a fan 2, a smoke collecting chamber 3, a detection mechanism 4, a horizontal telescopic rod 5, a vertical telescopic rod 6, and a driving mechanism 7. The housing 1 is arranged directly above a stove S1, on which is mounted at least one burner S2. If the stove S1 is mounted with multiple burners S2, these burners S2 are spaced apart along the length of the stove S1. The fan 2 and the smoke collecting chamber 3 are arranged inside the housing 1. The smoke collecting chamber 3 is provided with an air inlet and faces the area where the smoke is generated by the stove S1 below. When the fan 2 is started, the smoke generated by the pot S3 being cooked on the stove S2 can be sucked into the smoke collecting chamber 3 through the air inlet.

[0044] The vertical telescopic rod 6 is connected to the smoke collecting chamber 3, the horizontal telescopic rod 5 is connected to the vertical telescopic rod 6, and the detection mechanism 4 is arranged on the horizontal telescopic rod 5. More specifically, the top end of the vertical telescopic rod 6 is connected to the bottom of the smoke collecting chamber 3, and the bottom end of the vertical telescopic rod 6 is connected to one end of the horizontal telescopic rod 5.

[0045] The detection mechanism 4, vertical telescopic rod 6, and horizontal telescopic rod 5 are the main components used for measuring the distance between the range hood and the user. The detection mechanism 4 is used to horizontally detect the presence of obstructions, which include not only the pots and pans S3 on the stove top S2 but also other cooking utensils or kitchen utensils placed on the stovetop S1. The horizontal telescopic rod 5 can be extended and retracted horizontally. During the distance measurement process, the horizontal telescopic rod 5 continuously drives the detection mechanism 4 back and forth in the horizontal direction, upgrading the detection mechanism 4's "line" detection to "surface" detection. The vertical telescopic rod 6 can be extended and retracted vertically. During distance measurement, the vertical telescopic rod 6 extends vertically downward, driving the horizontal telescopic rod 5 and the detection mechanism 4 to move vertically downward. During this process, the detection mechanism 4 continuously detects the presence of obstructions until the detection mechanism 4 detects an obstruction, at which point the vertical telescopic rod 6 stops extending downward and determines the vertical distance between the smoke collection chamber 3 and the obstruction. After the distance measurement is completed, the vertical telescopic rod 6 retracts vertically upward.

[0046] The driving mechanism 7 is disposed in the housing 1 and connected to the smoke collecting chamber 3 , and is used to limit the distance by which the smoke collecting chamber 3 is driven to descend according to the vertical distance between the smoke collecting chamber 3 and the obstruction detected by the detecting mechanism 4 .

[0047] First of all, the main obstruction that the lifting range hood needs to detect is the pot S3 located on the stove S2. If the pot S3 is covered with a lid, both the horizontal detection and the vertical detection can detect the pot S3. If the pot S3 is not covered with a lid, it is limited by the thin pot wall. The vertical detection method from top to bottom is likely to fail to detect the pot wall, thereby incorrectly judging the true height of the pot wall, resulting in a large detection error, which will eventually cause the smoke collecting chamber 3 to collide with the pot S3 when it descends.

[0048] In this embodiment, the detection mechanism is to detect whether there is an obstruction (cooker S3) in the horizontal direction through the detection mechanism 4. The top edge of the cooker S3 and the top of the lid are easy to identify in the horizontal field of view. Therefore, regardless of whether the cooker S3 is covered with a lid or not, its true height can be accurately detected under the detection mechanism of this embodiment, thereby improving the accuracy of the distance measurement.

[0049] Secondly, in vertical detection, the detection range of detection mechanism 4 generally needs to cover the entire stovetop S1. Therefore, detection mechanism 4 requires a mobile mechanism to support its movement within the detection range. However, the mobile mechanism can only be located on the housing 1 or the smoke collection chamber 3. Therefore, the location of the mobile mechanism and the supported coverage range are subject to certain constraints. Alternatively, the detection coverage range can be increased by increasing the number of detection mechanisms 4, which undoubtedly increases costs. There are also some special cases, such as cooking utensils or kitchen utensils placed at the edge of stovetop S1. In this case, they will exceed the detection range of detection mechanism 4 and cannot be detected and identified by detection mechanism 4. In vertical detection, detection mechanism 4 needs to detect all pots S3 on stovetop S1 one by one, and then compare the detected pots S3 to determine the highest height of the pots S3 on stovetop S1, and ultimately determine the range hood's descent distance. Not only is the detection mechanism relatively cumbersome, but it also takes a relatively long time, reducing the efficiency of distance measurement.

[0050] It should be noted that the detection mechanism 4 of this embodiment can reduce the detection coverage from "surface" to "line" under the mechanism of horizontal detection. For example, if the detection mechanism 4 is set to the side of the stove S1, its detection range only needs to cover the width of the stove S1. For example, if the detection mechanism 4 is set to the back of the stove S1, its detection range only needs to cover the length of the stove S1. The range required for detection can be greatly reduced. In this embodiment, because the horizontal telescopic rod 5 drives the detection mechanism 4 to move back and forth in the horizontal direction, the actual detection range of the detection mechanism 4 is upgraded from "line" to "surface", which improves the detection density. Moreover, by detecting in the horizontal direction, the edge of the stove S1 can also be included in the detection range. Therefore, the detection method of this embodiment can expand the actual detection range while reducing the range required for detection coverage. The expanded actual detection range includes not only the width of the detection area, but also the detection density.

[0051] In this embodiment, the detection mechanism 4, driven by the vertical telescopic rod 6, continuously detects horizontally whether there is a pot S3. When the detection mechanism 4 detects the presence of the pot S3, it can be determined that the height detected at this time is the highest height of the pot S3 on the stove S1. No comparison is required. The descent distance of the range hood can be determined by the distance that the vertical telescopic rod 6 extends downward relative to the smoke collecting chamber 3 at this time. The distance measurement logic is relatively simple, easier to execute and less prone to errors, thereby improving the accuracy and efficiency of the distance measurement.

[0052] Furthermore, cooking fumes are directed upwards. For vertical detection, the detection mechanism 4 must be located directly above the stovetop S1, facing the direction of the fumes. If detection is performed under heavy fumes, this could interfere with the detection mechanism 4's ability to properly identify the pot S3, affecting the accuracy of the distance measurement. Furthermore, after prolonged use, the fumes from the range hood will form dirt on the detection mechanism 4, affecting its proper detection function.

[0053] Finally, in this embodiment, during the distance measurement process, the detection mechanism 4 is driven to move back and forth by the horizontal telescopic rod 5, and has the characteristics of high detection density and large detection range. It is particularly suitable for application environments where the stove S1 is large, the obstructions on the stove S1 are diverse, and the positions of the obstructions are complicated.

[0054] In this embodiment, the reciprocating extension speed of the horizontal telescopic rod 5 is greater than the vertical downward extension speed of the vertical telescopic rod 6. The speed difference between the two needs to be maximized as far as possible under the premise of feasibility to avoid the detection mechanism 4 failing to detect the obstruction in time.

[0055] In this embodiment, at least one detection mechanism 4 is provided. Generally, a household stove S1 usually has one or two burners. The detection range of one detection mechanism 4 can cover the pots S3 on the stove S1. If the stove S1 is specifically for the catering industry and has more than two burners S2, the number of detection mechanisms 4 needs to be reasonably set according to the actual situation. Regardless of whether one or more detection mechanisms 4 are provided, the detection mechanism 4 is provided on the side of the burner S2. If only one detection mechanism 4 is provided, the detection mechanism 4 is provided on the outside of the outermost burner S2 of the stove S1. If multiple detection mechanisms 4 are provided, the multiple detection mechanisms 4 are arranged at intervals, and each detection mechanism 4 is located on the side of the corresponding burner S2. In the embodiment of providing multiple detection mechanisms 4, these detection mechanisms 4 can realize the distance measurement of the stove S1 in a partitioned manner.

[0056] In this embodiment, the horizontal telescopic direction of the horizontal telescopic rod 5 and the length direction of the stove S1 are intertwined with each other. Generally, the horizontal telescopic direction and the length direction of the stove S1 are perpendicular to each other.

[0057] As for the detection mechanism 4, in this embodiment, the detection mechanism 4 includes at least one sensor arranged on the horizontal telescopic rod 5, and the sensor can emit a horizontal straight detection light beam to detect whether there is an obstruction.

[0058] In typical use of the stove S1, the pot S3 is placed squarely on the burner S2. Therefore, only one sensor is required to meet basic distance measurement requirements. The horizontal linear detection beam emitted by this sensor can pass through the center lines of all burners S2 (a perpendicular line passing through the burner centers) as the horizontal telescopic rod 5 reciprocates, ensuring that all pots S3 are within the detection coverage area. Alternatively, multiple sensors can be installed on the horizontal telescopic rod 5, with these sensors spaced apart from each other.

[0059] It is important to note that, from one perspective, given the same telescopic range of the horizontal telescopic rod 5, the greater the number of sensors installed, the larger the detection range that the detection mechanism 4 can cover. In applications where the stove S1 is large, obstructions on the stove S1 are diverse, and the positions of these obstructions are complex, increasing the number of sensors allows for more accurate distance measurement. From another perspective, given the same required detection range of the detection mechanism 4, the greater the number of sensors installed, the smaller the required telescopic range of the horizontal telescopic rod 5, the smaller the required speed difference between the horizontal telescopic rod 5 and the vertical telescopic rod 6, and the greater the control. In theory, regardless of the perspective, the greater the number of sensors installed, the more convenient distance measurement. However, in practice, the greater the number of sensors installed, the higher the cost and the greater the load on the horizontal telescopic rod 5 and the vertical telescopic rod 6. Therefore, the number of sensors, the telescopic range of the horizontal telescopic rod 5, and the speed difference between the horizontal telescopic rod 5 and the vertical telescopic rod 6 need to be appropriately set according to actual application requirements.

[0060] In this embodiment, the sensor is set to an infrared sensor, which has the advantages of high sensitivity, quick response, low price and stable performance. Of course, the sensor can also be set to other detection devices with similar effects.

[0061] Implementation Case 2:

[0062] A distance measurement method is implemented based on the lifting range hood distance measurement device of implementation case 1.

[0063] The steps include:

[0064] Step S1: the vertical telescopic rod 6 extends vertically downward, the horizontal telescopic rod 5 synchronously reciprocates in the horizontal direction, and the detection mechanism 4 continuously detects whether there is an obstruction in the horizontal direction.

[0065] Step S2: If the detection mechanism 4 detects an obstruction in the horizontal direction before the vertical telescopic rod 6 extends vertically downward to the maximum stroke s1, the vertical telescopic rod 6 extends vertically downward by a distance d5, and the vertical distance d2 = d5 between the smoke collecting chamber 3 and the obstruction is obtained.

[0066] Step S3: The vertical telescopic rod 6 retracts vertically upward, and the driving mechanism 7 drives the smoke collecting chamber 3 to descend a distance d3, d3 = d2 - d4, d4 is a safety distance. This safety distance can usually be a distance that is convenient for a user to perform cooking operations such as stir-frying, while ensuring that the smoke collecting chamber 3 can fully absorb oil smoke. It is preset before leaving the factory and can be obtained through multiple actual simulation tests.

[0067] Implementation Case 3:

[0068] A distance measurement method is implemented based on the lifting range hood distance measurement device of implementation case 1.

[0069] The steps include:

[0070] Step S1: the vertical telescopic rod 6 extends vertically downward, the horizontal telescopic rod 5 synchronously reciprocates in the horizontal direction, and the detection mechanism 4 continuously detects whether there is an obstruction in the horizontal direction.

[0071] Step S2: If the detection mechanism 4 does not detect an obstruction in the horizontal direction when the vertical telescopic rod 6 is extended vertically downward to the maximum travel distance s1, the driving mechanism 7 drives the smoke collecting chamber 3 to continue to descend until the detection mechanism 4 detects the obstruction. At this time, the vertical distance d2 = s1 between the smoke collecting chamber 3 and the obstruction is obtained.

[0072] Step S3: the vertical telescopic rod 6 is retracted vertically upward, and the driving mechanism 7 drives the smoke collecting chamber 3 to descend by a distance d3, where d3 = d2 - d4.

[0073] Implementation Case 4:

[0074] A distance measurement method is implemented based on the lifting range hood distance measurement device of implementation case 1.

[0075] The steps include:

[0076] Step S1: The vertical telescopic rod 6 is extended vertically downward by a distance d4;

[0077] Step S2: The driving mechanism 7 drives the smoke collecting chamber 3 to continuously descend, the horizontal telescopic rod 5 synchronously reciprocates and retracts in the horizontal direction, and the detection mechanism 4 continuously detects whether there is an obstruction in the horizontal direction;

[0078] Step S3: the detection mechanism 4 detects an obstruction in the horizontal direction, the driving mechanism 7 stops driving the smoke collecting chamber 3, and the vertical telescopic rod 6 retracts vertically upward.

[0079] Finally, it should be noted that the above implementation cases 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 above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A range hood distance measuring device, characterized in that: include: chassis; A fan is arranged in the casing; A smoke collecting chamber is arranged in the casing; A detection mechanism, used for horizontally detecting whether there is an obstruction; A horizontal telescopic rod, provided with the detection mechanism, which can be extended and retracted in the horizontal direction and is used to drive the detection mechanism to move back and forth in the horizontal direction; a vertical telescopic rod connecting the smoke collection chamber and the horizontal telescopic rod, capable of vertical extension and contraction, for extending vertically downward until the detection mechanism detects an obstruction while the smoke collection chamber is stationary, or for extending vertically downward to a safe distance before the smoke collection chamber continues to descend; A driving mechanism is disposed in the housing and connected to the smoke collecting chamber, and is used to limit the distance by which the smoke collecting chamber is driven to descend according to the vertical distance between the smoke collecting chamber and the obstruction detected by the detection mechanism, or to drive the smoke collecting chamber to continue descending after the vertical telescopic rod is vertically extended downward a safe distance until the detection mechanism detects the obstruction.

2. The distance measuring device for a range hood lift according to claim 1, characterized in that: The reciprocating extension and retraction speed of the horizontal telescopic rod is greater than the vertical downward extension speed of the vertical telescopic rod.

3. The distance measuring device for a range hood lift according to claim 1, characterized in that: At least one detection mechanism is provided and is located on the side of the stove head.

4. The distance measuring device for a range hood lift according to claim 3, characterized in that: The horizontal telescopic direction of the horizontal telescopic rod and the length direction of the stove intersect with each other.

5. The distance measuring device for a lifting range hood according to claim 1, characterized in that: The detection mechanism includes at least one sensor arranged on the horizontal telescopic rod, and the sensor can emit a horizontal linear detection light beam to detect whether there is an obstruction.

6. The distance measuring device for a lifting range hood according to claim 5, characterized in that: The horizontal straight line detection light beam emitted by the sensor can pass through the center lines of all the stove heads under the reciprocating extension and contraction of the horizontal telescopic rod.

7. The distance measuring device for a range hood lift according to claim 5, characterized in that: The sensor is configured as an infrared sensor.

8. A distance measurement method, based on the distance measurement device for a range hood lift according to any one of claims 1 to 7, characterized in that the steps include: Step S1: The vertical telescopic rod extends vertically downward, and the horizontal telescopic rod synchronously reciprocates in the horizontal direction, and the detection mechanism continuously detects whether there is an obstruction in the horizontal direction; Step S2: the detection mechanism detects the obstruction in the horizontal direction and obtains the vertical distance d2 between the smoke collecting chamber and the obstruction; Step S3: the vertical telescopic rod is retracted vertically upward, and the driving mechanism drives the smoke collecting chamber to descend a distance d3, d3 = d2 - d4, and d4 is a preset safety distance.

9. The distance measurement method according to claim 8, characterized in that: Step S2: If the detection mechanism detects an obstruction in the horizontal direction before the vertical telescopic rod is vertically extended downward to the maximum stroke s1, then the vertical telescopic rod vertically extended downward distance d5 = d2.

10. The distance measurement method according to claim 8, characterized in that: If the detection mechanism does not detect an obstruction in the horizontal direction when the vertical telescopic rod is vertically extended downward to the maximum travel distance s1, the driving mechanism drives the smoke collecting chamber to continue to descend until the detection mechanism detects an obstruction, at which time d2=s1.

11. A distance measurement method, based on the range hood distance measurement device according to any one of claims 1 to 7, characterized in that the steps include: Step S1: The vertical telescopic rod is vertically extended downward by a distance d4, where d4 is a preset safety distance; Step S2: the driving mechanism drives the smoke collecting chamber to continuously descend, the horizontal telescopic rod synchronously reciprocates and retracts in the horizontal direction, and the detection mechanism continuously detects whether there is an obstruction in the horizontal direction; Step S3: the detection mechanism detects an obstruction in the horizontal direction, the driving mechanism stops driving the smoke collecting chamber, and the vertical telescopic rod retracts vertically upward.

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