Range hood

Abstract

The embodiment of the utility model discloses a range hood which comprises a machine shell, a main control board and a human body induction module, and the human body induction module is arranged on the machine shell; the human body induction module comprises a plurality of human body induction units which are electrically connected with the main control board; the plurality of human body sensing units are respectively arranged on the same rotating curved surface, all the human body sensing units are respectively arranged towards different directions, all the human body sensing units and the plane where the range hood is located form a first installation inclination angle A, and all the human body sensing units obliquely irradiate to the ground according to the first installation inclination angle A to form corresponding irradiation light paths; an area between the adjacent irradiation light paths forms a corresponding irradiation area, and the irradiation area forms a target induction space for realizing a human body induction function below the range hood. According to the range hood, whether a user exists or not can be sensed in the target sensing space, the consistency of sensing distances in all directions is guaranteed, and users of different heights can be sensed.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of household appliances, and in particular to a range hood. Background Art

[0002] With the development of science and technology, users have higher and higher requirements for household appliances. In addition to the diversification of the functions of household appliances, the intelligence of household appliances is also receiving more and more attention from users.

[0003] Existing range hoods with human body sensing function use infrared pyroelectric sensors to sense human body. However, infrared pyroelectric sensors are easily interfered by various heat sources and light sources, have poor passive infrared penetration, and the infrared radiation of human body is easily blocked and not easy to be received by infrared pyroelectric probes. In addition, when the ambient temperature is close to the human body temperature, the detection sensitivity of infrared pyroelectric sensors is significantly reduced, sometimes causing short-term failure. The above shortcomings can lead to unstable sensing distance and sensing angle of infrared pyroelectric sensors.

[0004] Existing range hoods with human body sensing function also use microwave radar sensors to sense human bodies. Among them, although microwave radar sensors are not easily disturbed by heat sources, light sources and ambient temperature, their side sensing distance is often closer than the forward sensing distance. At the same time, the sensing distance of the microwave radar sensor will also be affected by the user's moving speed and body size. When the user moves fast, the sensing distance is closer than when the user moves slowly. When the user is small, the sensing distance is closer than when the user is large. In addition, the sensing distance of the microwave radar sensor will also be affected by the kitchen environment. The radar electromagnetic waves emitted by the microwave radar sensor will be reflected multiple times in the kitchen environment, and a part of the reflected signal will reach the microwave radar receiving end. When the received reflected signal energy is large, the sensing distance is farther than when the received reflected signal energy is small. The size of the kitchen space and the position of metal objects in the kitchen often affect the energy of the received reflected signal. In addition, the microwave radar sensor can be used to sense moving users, and when the user is not moving or stationary, the microwave radar sensor will not sense the user. Moreover, the above deficiencies may lead to instability in the sensing distance and sensing angle of the microwave radar sensor, and inconsistency in the side and front sensing distances and sensing angles.

[0005] The existing range hoods with human body sensing function also have a solution of using infrared tubes to sense the human body. Among them, the infrared tube includes an infrared transmitter and an infrared receiver. Since the infrared signal corresponding to the infrared transmitter has a small emission angle and is almost emitted in a straight line, the infrared receiver can only receive the reflected infrared signal when the user is directly in front of the infrared transmitter, that is, the infrared tube can only sense the presence of the user directly in front, and cannot sense the presence of the user on the side, resulting in the side of the infrared tube being a sensing blind spot, and its sensing angle is very limited. At the same time, since the infrared signal corresponding to the infrared transmitter is emitted almost in a straight line, for users with shorter height, the infrared signal passes over the user's head and cannot be shot to the user, which in turn makes it impossible to reflect the infrared signal to the infrared receiver, and finally makes the infrared tube unable to sense users with shorter height. As long as the user's height is lower than the height of the infrared transmitter, the bottom of the infrared tube also becomes a sensing blind spot. In addition, multiple pairs of infrared tubes are used to sense the human body. However, due to the small number of infrared tubes and the large angle arrangement between the infrared tubes, there is a sensing blind spot at the maximum sensing distance within the entire sensing angle range, resulting in the user not being sensed at the sensing blind spot, giving the user a poor human-computer interaction experience.

[0006] In summary, a range hood with a human body sensing function urgently needs a design solution that does not have a sensing blind spot within the sensing distance and sensing angle range. Utility Model Content

[0007] The embodiment of the utility model provides a range hood, which has no sensing blind spots within the sensing distance and sensing angle range, thereby effectively improving the human-computer interaction experience.

[0008] The embodiment of the utility model provides a range hood, comprising a casing, a main control board and a human body sensing module, wherein the human body sensing module is arranged on the casing;

[0009] The human body sensing module includes a plurality of human body sensing units, and the plurality of human body sensing units are electrically connected to the main control board;

[0010] The plurality of human body sensing units are arranged on the same rotating curved surface, and the human body sensing units are arranged in different directions. The human body sensing units and the plane where the range hood is located form a first installation inclination angle ∠A, and the human body sensing units are inclined toward the ground according to the first installation inclination angle ∠A to form a corresponding illumination light path;

[0011] The area between the adjacent illumination light paths constitutes a corresponding illumination area, and the illumination area constitutes a target sensing space below the range hood for realizing a human body sensing function.

[0012] Optionally, each of the human body sensing units is located at the same horizontal height h1;

[0013] The irradiation area is at least a portion of a conical surface, and the target sensing space is composed of a target horizontal plane and the conical surface; wherein the horizontal height h2 of the target horizontal plane is determined based on a statistical value of the user's height.

[0014] Optionally, the maximum irradiation distance a of each human body sensing unit on the corresponding irradiation light path satisfies the formula

[0015] Among them, h1-h2 is the target detection height corresponding to the target sensing space, c is the target horizontal detection distance, and the target horizontal detection distance c is the radius of the positive projection of the cone surface on the target horizontal plane.

[0016] Optionally, the orthographic projection of the cone surface on the target horizontal plane is a first sector shape, and the angle of the first sector shape is ∠D;

[0017] In the conical surface, two adjacent illumination light paths form a second fan-shaped shape, and the included angle of the second fan-shaped shape is ∠J;

[0018] The orthographic projection of the second sector shape on the target horizontal plane is a third sector shape, the arc corresponding to the second sector shape is the same as the arc corresponding to the third sector shape, and the included angle of the third sector shape is ∠B;

[0019] Wherein, the number of the human body sensing units is determined based on the ∠D and the ∠B.

[0020] Optionally, the ∠B satisfies the formula ∠B=2×arcsin[e / (2×c)]; wherein e is the chord length of the arc corresponding to the third sector shape where the ∠B is located on the target horizontal plane;

[0021] If the formula ∠D / ∠B=M is ​​satisfied, and M is an integer, then the number of the human body sensing units f≥M+1.

[0022] Optionally, the ∠B satisfies the formula ∠B=2×arcsin[e / (2×c)]; wherein e is the chord length of the arc corresponding to the third sector shape where the ∠B is located on the target horizontal plane;

[0023] If the formula ∠D / ∠B=M...X is satisfied, M is an integer, and X is a remainder, then the number of the human body sensing units f≥M+2.

[0024] Optionally, the ∠J satisfies the formula Wherein, e is the chord length of the arc corresponding to the third sector shape where ∠B is located on the target horizontal plane.

[0025] Optionally, the reverse extension lines of the illumination light paths corresponding to the human body sensing units have a common intersection, and the intersection is located on the central axis of the rotation curved surface.

[0026] Optionally, the range hood is installed with its back against a wall, and each of the human body sensing units in the human body sensing module is arranged on a side of the casing away from the wall.

[0027] Optionally, the human body sensing unit is an infrared tube or a laser sensor.

[0028] An embodiment of the utility model provides a range hood, which includes a casing, a main control board and a human body sensing module, wherein the human body sensing module is arranged on the casing; the human body sensing module includes a plurality of human body sensing units, and the plurality of human body sensing units are electrically connected to the main control board; the plurality of human body sensing units are arranged on the same rotating curved surface, and each human body sensing unit is arranged in a different orientation, and each human body sensing unit forms a first installation inclination angle ∠A with the plane where the range hood is located, and each human body sensing unit is inclined toward the ground according to the first installation inclination angle ∠A to form a corresponding illumination light path; the area between adjacent illumination light paths constitutes a corresponding illumination area, and the illumination area constitutes a target sensing space below the range hood for realizing the human body sensing function. The human body sensing module of the range hood is provided with a plurality of human body sensing units, and the plurality of human body sensing units are arranged on the same rotating curved surface, and the human body sensing units are arranged in different directions respectively, and the human body sensing units form a first installation inclination angle ∠A with the plane where the range hood is located, and the human body sensing units are tilted toward the ground according to the first installation inclination angle ∠A, that is, in the target sensing space, the human body sensing module can sense the user in the front direction, and can also sense the user in the side and below, and ensures the consistency of the sensing distance in each direction in the front and side directions, and can sense users of different heights. There is no sensing dead angle within the sensing distance and sensing angle range, that is, the presence or absence of the user can be sensed in the target sensing space, avoiding the problem of low human body sensing accuracy caused by the influence of heat source, light source, ambient temperature, user movement speed, user body size, kitchen environment, etc., and improving the human-computer interaction experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a side view structural schematic diagram of a range hood provided by an embodiment of the utility model;

[0031] Figure 2 It is a front view structural schematic diagram of a range hood provided by an embodiment of the utility model;

[0032] Figure 3 It is a structural schematic diagram of a human body sensing three-dimensional model of a range hood provided by an embodiment of the utility model;

[0033] Figure 4 yes Figure 3 The enlarged structural diagram of the target horizontal plane in the human body sensing three-dimensional model is shown;

[0034] Figure 5 It is a structural schematic diagram of a human body sensing module provided by an embodiment of the utility model;

[0035] Figure 6 yes Figure 5 The structural diagram of the electrical connection relationship between the human body sensing module and the main control board shown;

[0036] Figure 7 It is a structural schematic diagram of another human body sensing module provided by an embodiment of the utility model;

[0037] Figure 8 yes Figure 7 The structural schematic diagram of the electrical connection relationship between the human body sensing module and the main control board is shown.

[0038] Description of reference numerals:

[0039] 10- housing;

[0040] 20- Main control board;

[0041] 30-human body sensing module; 31-human body sensing unit; 311-infrared transmitter; 312-infrared receiver; 313-laser transmitter; 314-laser receiver; 32-irradiation light path; 33-irradiation area; 34-central axis; 35-flexible circuit board; 36-sensor detection board; 37-sensor main board. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. It should be noted that the directional words such as "upper", "lower", "left", "right" and the like described in the embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be directly formed "on" or "under" another element, but also indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second", etc. are only used for descriptive purposes and do not represent any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0044] The term "including" and its variations used in the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment".

[0045] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish the corresponding contents, and are not used to limit the order or interdependence.

[0046] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0047] Figure 1 1 is a side view of a range hood provided by an embodiment of the utility model. Figure 2 1 is a front view structural diagram of a range hood provided by an embodiment of the utility model. Figure 3 : is a schematic diagram of the structure of a human body sensing three-dimensional model of a range hood provided by an embodiment of the utility model, such as Figure 1 , Figure 2 and Figure 3As shown, the range hood includes a casing 10, a main control board 20 and a human body sensing module 30, and the human body sensing module 30 is arranged on the casing 10; the human body sensing module 30 includes a plurality of human body sensing units 31, and the plurality of human body sensing units 31 are electrically connected to the main control board 20; the plurality of human body sensing units 31 are arranged on the same rotating curved surface, and each human body sensing unit 31 is arranged in a different orientation, and each human body sensing unit 31 forms a first installation inclination angle ∠A with the plane where the range hood is located, and each human body sensing unit 31 is inclined toward the ground according to the first installation inclination angle ∠A to form a corresponding illumination light path 32; the area between adjacent illumination light paths 32 constitutes a corresponding illumination area 33, and the illumination area 33 constitutes a target sensing space below the range hood for realizing the human body sensing function.

[0048] Specifically, the range hood includes a housing 10, a main control board 20, and a human body sensing module 30. The human body sensing module 30 is disposed on the housing 10, and can sense the presence of a user in real time. For example, the human body sensing module 30 can sense the approach or distance of the user, the movement or stillness of the user, the relative position of the user and the range hood, etc. For example, the human body sensing module 30 can be disposed on a side surface of the housing 10 facing the user's cooking position.

[0049] The human body sensing module 30 includes multiple human body sensing units 31, and the multiple human body sensing units 31 are electrically connected to the main control board 20. Exemplarily, the main control board 20 can supply power to each human body sensing unit 31 to ensure the normal operation of each human body sensing unit 31. The main control board 20 can also quickly determine the sensing results such as the user's approach or distance, the user's movement or stillness, and the relative position of the user and the range hood based on the real-time information of each human body sensing unit 31.

[0050] A plurality of human body sensing units 31 are arranged on the same rotating curved surface, and each human body sensing unit 31 is arranged in a different orientation. Thus, each human body sensing unit 31 can sense the presence of a user in a corresponding orientation. Furthermore, each human body sensing unit 31 can sense the specific relative position of the user and the range hood in a corresponding orientation. That is, the human body sensing module 30 can sense the user in the forward direction or in the side direction by reasonably arranging the positions of each human body sensing unit 31, thereby ensuring that there is no sensing dead angle within the sensing angle range corresponding to the human body sensing function. Furthermore, each human body sensing unit 31 forms a first installation inclination angle ∠A with the plane where the range hood is located, and each human body sensing unit 31 is tilted toward the ground according to the first installation inclination angle ∠A to form a corresponding illumination light path 32. By way of example, each human body sensing unit 31 is installed on the housing 10 at an angle tilted downward. In this way, the human body sensing module 30 can also sense the user below, and each human body sensing unit 31 is tilted toward the ground at the first installation angle ∠A, which can effectively avoid the problem that a shorter user cannot be sensed.

[0051] The detection signal path of each human body sensing unit 31 obliquely projected toward the ground is the corresponding illumination light path 32, and the area between adjacent illumination light paths 32 constitutes the corresponding illumination area 33, and the illumination area 33 constitutes a target sensing space for realizing the human body sensing function below the range hood. In this way, in the target sensing space, each human body sensing unit 31 can sense the presence of the user in real time. For example, the human body sensing module 30 can sense the user's approach or distance, the user's movement or stillness, the relative position of the user and the range hood, etc. In addition, it can be understood that when the number of illumination areas 33 is small, the illumination area 33 can correspond to the target sensing space of a smaller area, and when the number of illumination areas 33 is large, the illumination areas 33 can overlap or splice each other to form a target sensing space of a larger area. In this way, in order to obtain a target sensing space of a suitable area range size, the number of illumination light paths 32 formed can be adjusted to change the number of corresponding illumination areas 33.

[0052] According to the technical solution in the embodiment of the utility model, the range hood includes a casing, a main control board and a human body sensing module, the human body sensing module is arranged on the casing; the human body sensing module includes a plurality of human body sensing units, and the plurality of human body sensing units are electrically connected to the main control board; the plurality of human body sensing units are arranged on the same rotating curved surface, each human body sensing unit is arranged in a different orientation, each human body sensing unit forms a first installation inclination angle ∠A with the plane where the range hood is located, and each human body sensing unit is inclined toward the ground according to the first installation inclination angle ∠A to form a corresponding illumination light path; the area between adjacent illumination light paths constitutes a corresponding illumination area, and the illumination area constitutes a target sensing space below the range hood for realizing the human body sensing function. The human body sensing module of the range hood is provided with a plurality of human body sensing units, and the plurality of human body sensing units are arranged on the same rotating curved surface, and the human body sensing units are arranged in different directions respectively, and the human body sensing units form a first installation inclination angle ∠A with the plane where the range hood is located, and the human body sensing units are tilted toward the ground according to the first installation inclination angle ∠A, that is, in the target sensing space, the human body sensing module can sense the user in the front direction, and can also sense the user in the side and below, and ensures the consistency of the sensing distance in each direction in the front and side directions, and can sense users of different heights. There is no sensing dead angle within the sensing distance and sensing angle range, that is, the presence or absence of the user can be sensed in the target sensing space, avoiding the problem of low human body sensing accuracy caused by the influence of heat source, light source, ambient temperature, user movement speed, user body size, kitchen environment, etc., and improving the human-computer interaction experience.

[0053] Optionally, continue to refer to Figure 1 , Figure 2 and Figure 3 , each human body sensing unit 31 is located at the same horizontal height h1; the irradiation area 33 is at least a partial cone, and the target sensing space is composed of a target horizontal plane and a cone; wherein the horizontal height h2 of the target horizontal plane is determined based on the statistical value of the user's height.

[0054] For better understanding and calculation, the human body sensing units 31 in the human body sensing module 30 can be gathered into a vertex O', and the human body sensing units 31 can be understood as the position concept of the same point, that is, the vertex O' forms a first installation inclination angle ∠A with the plane where the range hood is located, and the vertex O' can emit detection signals in different directions, and the path of the detection signal forms a corresponding illumination light path 32. For example, Figure 3The connecting lines O'G, O'L, O'F, O'S...O'K shown and their extension lines can be understood as the illumination light path 32. The area between adjacent illumination light paths 32 constitutes the corresponding illumination area 33, and the illumination area 33 is at least a part of the cone surface, so it can be understood that each illumination light path 32 is arranged in the direction of the generatrix of the cone. The target sensing space is composed of a target horizontal plane and a cone surface corresponding to the illumination area 33. For example, the shape of the target horizontal plane can be circular. The presence of the user can be sensed in the target sensing space, that is, when the user enters the target sensing space, at least one human body sensing unit 31 in the human body sensing module 30 can sense the presence of the user. It should be noted that the present embodiment does not specifically limit or make special requirements on the number of human body sensing units 31 and the number and arrangement of the illumination light paths 32. For example, the human body sensing units 31 can be evenly arranged on the corresponding rotating curved surface so that the corresponding illumination light paths 32 are evenly arranged on the corresponding cone surface to reduce the situation of sensing dead angles between adjacent illumination light paths 32.

[0055] Specifically, each human body sensing unit 31 is located at the same horizontal height h1. For example, the horizontal height h1 can be understood as the installation height of the human body sensing unit 31, and the installation height of the human body sensing unit 31 can be determined according to the different forms of the range hood. The horizontal height h2 of the target horizontal plane is determined based on the statistical value of the user's height. For example, the horizontal height h2 can be determined based on the statistical value of the height of the corresponding human body part representing the user. The horizontal height h2 can be suitable for sensing users of different heights. For example, the horizontal height h2 can be determined based on the statistical value of the height between the user's knees and waist to ensure that users with shorter heights can also be sensed by the human body sensing unit 31. For example, the horizontal height h2 can be 0.5m. The irradiation area 33 is at least a partial cone surface, and the target sensing space is composed of a target horizontal plane and a cone surface. In this way, in the target sensing space, within the sensing angle range, and at any orientation, the maximum sensing distance of the corresponding human body sensing unit 31 is the same, which effectively improves the consistency of the sensing distance and sensing angle corresponding to the human body sensing function, and at any position on the target horizontal plane and the cone surface of the target sensing space, the human body sensing unit 31 can sense the presence or absence of the user, that is, there is no sensing blind spot in the target sensing space.

[0056] Optionally, continue to refer to Figure 1 , Figure 2 and Figure 3 , the maximum irradiation distance a of each human body sensing unit 31 on the corresponding irradiation light path 32 satisfies the formula Among them, h1-h2 is the target detection height corresponding to the target sensing space, c is the target horizontal detection distance, and the target horizontal detection distance c is the radius of the positive projection of the cone surface on the target horizontal plane.

[0057] Specifically, a is the maximum irradiation distance of each human body sensing unit 31 on the corresponding irradiation light path 32, h1-h2 is the target detection height corresponding to the target sensing space, c is the target horizontal detection distance, and the target horizontal detection distance c is the radius of the positive projection of the cone on the target horizontal plane. The maximum irradiation distance a, the target detection height (h1-h2), and the target horizontal detection distance c satisfy the formula In this way, when the horizontal height h1 of the human body sensing unit 31, the horizontal height h2 of the target horizontal plane, and the target horizontal detection distance c are all known, the value of the maximum irradiation distance a can be derived and determined, or when the horizontal height h1 of the human body sensing unit 31, the horizontal height h2 of the target horizontal plane, and the maximum irradiation distance a are all known, the value of the target horizontal detection distance c can be derived and determined. In addition, in a specific embodiment, Figure 3 The orthographic projection of the maximum irradiation distance a of the human body sensing unit 31 on the corresponding irradiation light path 32 on the target horizontal plane can be exactly the target horizontal detection distance c, that is, the irradiation light path 32 corresponding to the human body sensing unit 31 is completely located on the cone surface. For example, the orthographic projection of the vertex O' where the human body sensing units 31 in the human body sensing module 30 are gathered on the target horizontal plane is the vertex O. Figure 3 Taking the irradiation light path 32 of O'G as an example, the orthographic projection of O'G on the target horizontal plane is OG, then the length of O'G can be the value of the maximum irradiation distance a, and the length of OG can be the value of the target horizontal detection distance c. That is, at this time, the maximum irradiation distance a, the target horizontal detection distance c, and the target detection height (h1-h2) are the three sides of the same right triangle, and the maximum irradiation distance a, the target detection height (h1-h2), and the target horizontal detection distance c satisfy the formula In another specific embodiment, the portion of the illumination light path 32 corresponding to any human body sensing unit 31 is located on the cone surface, that is, the length of the orthographic projection of the maximum illumination distance a of the human body sensing unit 31 on the corresponding illumination light path 32 on the target horizontal plane is greater than the length of the target horizontal detection distance c. At this time, the maximum illumination distance a, the target detection height (h1-h2), and the target horizontal detection distance c satisfy the formula

[0058] Optionally, Figure 4 yes Figure 3 The enlarged structural diagram of the target horizontal plane in the human body sensing three-dimensional model shown in FIG. Figure 1 , Figure 2 , Figure 3 and Figure 4, the orthographic projection of the cone on the target horizontal plane is a first fan-shaped shape, and the angle of the first fan-shaped shape is ∠D; in the cone, two adjacent illumination light paths 32 constitute a second fan-shaped shape, and the angle of the second fan-shaped shape is ∠J; the orthographic projection of the second fan-shaped shape on the target horizontal plane is a third fan-shaped shape, the arc corresponding to the second fan-shaped shape is the same as the arc corresponding to the third fan-shaped shape, and the angle of the third fan-shaped shape is ∠B; wherein, the number of human body sensing units 31 is determined based on ∠D and ∠B.

[0059] Specifically, the human body sensing units 31 in the human body sensing module 30 are gathered into a vertex O'. Figure 3 The connecting lines O'G, O'L, O'F, O'S...O'K and their extension lines can be understood as the irradiation light path 32. For example, the length of the irradiation light path 32 can also be understood as the irradiation distance corresponding to the human body sensing unit 31. The orthographic projection of the vertex O' where the human body sensing units 31 in the human body sensing module 30 are gathered on the target horizontal plane is the vertex O, Figure 3 and Figure 4 The connecting lines OG, OL, OF, OS...OK and their extension lines shown can be understood as the orthographic projection of the illumination light path 32 on the target horizontal plane. Exemplarily, the length of the orthographic projection of the illumination light path 32 on the target horizontal plane can also be understood as the horizontal detection distance corresponding to the human body sensing unit 31. In a specific embodiment, the lengths of O'G, O'L, O'F, O'S...O'K are the same, and the lengths of the corresponding OG, OL, OF, OS...OK are also the same, thus ensuring the consistency of the sensing distance of the human body sensing module 30 in all directions, and ensuring the consistency of the sensing distance and sensing angle corresponding to the human body sensing function.

[0060] The orthographic projection of the cone surface corresponding to the irradiation area 33 on the target horizontal plane is a first fan-shaped shape, and the angle of the first fan-shaped shape is ∠D, which can be understood as the maximum sensing angle of the human body sensing module 30. Exemplarily, within the angle range corresponding to ∠D, the human body sensing unit 31 can sense the presence or absence of the user. Exemplarily, on the target horizontal plane, the line segment OG, the line segment OK and the arc GK constitute the first fan-shaped shape, and the angle between the line segment OG and the line segment OK is ∠D. In the cone surface corresponding to the irradiation area 33, two adjacent irradiation light paths 32 constitute a second fan-shaped shape, and the angle of the second fan-shaped shape is ∠J, which can be understood as the angle of the irradiation light paths 32 emitted by adjacent human body sensing units 31. Exemplarily, in the conical surface corresponding to the irradiation area 33, the line segment O'G, the line segment O'L and the arc GL form the second sector shape, and the angle between the line segment O'G and the line segment O'L is ∠J. Similarly, the angle between the line segment O'L and the line segment O'F is also ∠J. The orthographic projection of the second sector shape on the target horizontal plane is a third sector shape, the arc corresponding to the second sector shape is the same as the arc corresponding to the third sector shape, and the angle of the third sector shape is ∠B, which can be understood as the orthographic projection of the angle of ∠J on the target horizontal plane is ∠B. Exemplarily, on the target horizontal plane, the line segment OG, the line segment OL and the arc GL form the third sector shape, and the angle between the line segment OG and the line segment OL is ∠B. Similarly, the angle between the line segment OL and the line segment OF is also ∠B. And, in the second sector shape and the third sector shape, it can be clearly seen that the same arc line GL exists in both. Figure 4It can also be clearly seen that there is a certain relationship between the number of the third fan-shaped shapes and the number of the human body sensing units 31, and the angles of the angle ∠D of the first fan-shaped shape and the angle ∠B of the third fan-shaped shape are also mutually constrained. For example, the more the number of human body sensing units 31, the more the number of third fan-shaped shapes formed by the illumination light paths 32 corresponding to the adjacent human body sensing units 31 on the target horizontal plane, and the larger the angle ∠D of the first fan-shaped shape formed by the orthographic projection of the cone surface corresponding to the total illumination area 33 on the target horizontal plane. Similarly, if the size of the angle ∠D of the first fan-shaped shape formed by the orthographic projection of the cone surface corresponding to the total illumination area 33 on the target horizontal plane is fixed, then the smaller the size of the angle ∠B of the third fan-shaped shape, the more the number of human body sensing units 31 required, or, the larger the size of the angle ∠B of the third fan-shaped shape, the fewer the number of human body sensing units 31 required. That is, the number of human body sensing units 31 is determined based on ∠D and ∠B. In this way, the number of human body sensing units 31 and the size of the angle of the illumination light path 32 corresponding to adjacent human body sensing units 31 can be reasonably designed according to the constraint relationship between the number of human body sensing units 31, the angle ∠D of the first fan-shaped shape and the angle ∠B of the third fan-shaped shape, so as to ensure that there is no sensing blind spot within the sensing angle range and at the maximum sensing distance, and ensure that the presence of the user can be sensed in the target sensing space, thereby effectively improving the human-computer interaction experience.

[0061] In a specific embodiment, optionally, continue to refer to Figure 3 and Figure 4 , ∠B satisfies the formula ∠B=2×arcsin[e / (2×c)]; wherein e is the chord length of the arc corresponding to the third sector shape where ∠B is located on the target horizontal plane; if the formula ∠D / ∠B=M is satisfied, M is an integer, then the number of human body sensing units 31 f≥M+1.

[0062] Specifically, in the cone surface corresponding to the irradiation area 33, two adjacent irradiation light paths 32 form a second fan-shaped shape, and the orthographic projection of the second fan-shaped shape on the target horizontal plane is a third fan-shaped shape, and the angle of the third fan-shaped shape is ∠B. Exemplarily, on the target horizontal plane, the line segment OG, the line segment OL and the arc GL form the third fan-shaped shape, and the angle between the line segment OG and the line segment OL is ∠B. At this time, the chord lengths corresponding to the line segment OG, the line segment OL and the arc GL are the three sides of the same isosceles triangle, the length of the line segment OG is the value of the target horizontal detection distance c, and the length of the line segment OL is the value of the target horizontal detection distance c. Then the length of the line segment OG and the length of the line segment OL can both be understood as c, and the length of the chord length corresponding to the arc GL is e. In this way, according to the sine theorem of the triangle, it can be determined that ∠B satisfies the formula ∠B=2×arcsin[e / (2×c)]. Exemplarily, when the value of the length e of the chord corresponding to the arc GL and the value of the target horizontal detection distance c are known, the size of the angle ∠B of the third sector shape can be determined. Exemplarily, the value of the length e of the chord corresponding to the arc GL can be based on the average value of the user's body width, and the value of the length e of the chord corresponding to the arc GL is less than the average value of the user's body width, so that there is no sensing dead angle between adjacent illumination light paths 32 at the maximum sensing distance. Exemplarily, the length e of the chord corresponding to the arc GL can be 0.3m.

[0063] If the formula ∠D / ∠B=M is satisfied, where M is an integer, which means that ∠D and ∠B are divisible, then the number of human body sensing units 31 f≥M+1. For example, if ∠D is 80° and ∠B is 20°, at least 5 human body sensing units 31 need to work simultaneously to ensure that the presence of the user can be sensed in the target sensing space.

[0064] In another specific embodiment, optionally, continue to refer to Figure 3 and Figure 4 , ∠B satisfies the formula ∠B=2×arcsin[e / (2×c)]; wherein, e is the chord length of the arc corresponding to the third sector shape where ∠B is located on the target horizontal plane; if the formula ∠D / ∠B=M……X is satisfied, M is an integer, and X is a remainder, then the number of human body sensing units 31 f≥M+2.

[0065] Specifically, in the cone surface corresponding to the irradiation area 33, two adjacent irradiation light paths 32 form a second fan-shaped shape, and the orthographic projection of the second fan-shaped shape on the target horizontal plane is a third fan-shaped shape, and the angle of the third fan-shaped shape is ∠B. Exemplarily, on the target horizontal plane, the line segment OG, the line segment OL and the arc GL form the third fan-shaped shape, and the angle between the line segment OG and the line segment OL is ∠B. At this time, the chord lengths corresponding to the line segment OG, the line segment OL and the arc GL are the three sides of the same isosceles triangle, the length of the line segment OG is the value of the target horizontal detection distance c, and the length of the line segment OL is the value of the target horizontal detection distance c. Then the length of the line segment OG and the length of the line segment OL can both be understood as c, and the length of the chord length corresponding to the arc GL is e. In this way, according to the sine theorem of the triangle, it can be determined that ∠B satisfies the formula ∠B=2×arcsin[e / (2×c)]. Exemplarily, when the value of the length e of the chord corresponding to the arc GL and the value of the target horizontal detection distance c are known, the size of the angle ∠B of the third sector shape can be determined. Exemplarily, the value of the length e of the chord corresponding to the arc GL can be based on the average value of the user's body width, and the value of the length e of the chord corresponding to the arc GL is less than the average value of the user's body width, so that there is no sensing dead angle between adjacent illumination light paths 32 at the maximum sensing distance. Exemplarily, the length e of the chord corresponding to the arc GL can be 0.3m.

[0066] If the formula ∠D / ∠B=M……X is satisfied, M is an integer, and X is a remainder, which means that ∠D and ∠B are not divisible, then the number of human body sensing units 31 f≥M+2. For example, if ∠D is 80° and ∠B is 15°, at least 7 human body sensing units 31 need to work simultaneously to ensure that the presence of the user can be sensed in the target sensing space.

[0067] Optionally, continue to refer to Figure 3 and Figure 4 , ∠J satisfies the formula Wherein, e is the chord length of the arc corresponding to the third sector shape where ∠B is located on the target horizontal plane.

[0068] Specifically, in the conical surface corresponding to the irradiation area 33, two adjacent irradiation light paths 32 form a second sector shape, and the angle of the second sector shape is ∠J, which can be understood as the angle of the irradiation light paths 32 emitted by the adjacent human body sensing units 31. Exemplarily, the line segment O'G, the line segment O'L and the arc GL form the second sector shape, and the angle between the line segment O'G and the line segment O'L is ∠J. At this time, the chord lengths corresponding to the line segment O'G, the line segment O'L and the arc GL are the three sides of the same isosceles triangle, the length of the line segment O'G is the value of the maximum irradiation distance a, and the length of the line segment O'L is the value of the maximum irradiation distance a, then the length of the line segment OG and the length of the line segment OL can both be understood as a, and the length of the chord length corresponding to the arc GL is e. In this way, according to the sine theorem of the triangle, and It can be determined Exemplarily, when the value of the length e of the chord corresponding to the arc GL, the value of the target detection height (h1-h2), and the value of the target horizontal detection distance c are known, the size of the angle ∠J of the second fan-shaped shape can be determined. Among them, exemplarily, in the second fan-shaped shape and the third fan-shaped shape, it can be clearly seen that the same arc GL exists in both, and the value of the length e of the chord corresponding to the arc GL can be based on the average value of the user's body width. The value of the length e of the chord corresponding to the arc GL is less than the average value of the user's body width, so that there is no induction dead angle between adjacent illumination light paths 32 at the maximum sensing distance. Exemplarily, the length e of the chord corresponding to the arc GL can be 0.3m.

[0069] It should be noted that the present embodiment describes and defines the relationship between the number of human body sensing units 31, the angle of ∠D, the angle of ∠J and the angle of ∠B. In this way, by reasonably designing the number of human body sensing units 31, the angle of ∠D, the angle of ∠J and the angle of ∠B, there is no sensing dead angle within the sensing angle range and at the maximum sensing distance, ensuring that the presence of the user can be sensed in the target sensing space, effectively improving the human-computer interaction experience. Exemplarily, the angle ∠J of the angle between adjacent human body sensing units 31 can be determined based on the required maximum sensing angle corresponding to ∠D and the value of the chord length of the arc corresponding to the third sector shape where ∠B is located at the maximum sensing distance, and the value of the number f of human body sensing units 31 can be determined.

[0070] Optionally, Figure 5 is a structural diagram of a human body sensing module provided by an embodiment of the utility model, such as Figure 5 As shown, the reverse extension lines of the illumination light paths 32 corresponding to the human body sensing units 31 have a common intersection point O", and the intersection point O" is located on the central axis 34 of the rotation curved surface.

[0071] Specifically, each human body sensing unit 31 is slanted toward the ground in different directions according to the first installation inclination angle ∠A to form a corresponding illumination light path 32. The reverse extension lines of the illumination light paths 32 corresponding to each human body sensing unit 31 have a common intersection point O", which means that the illumination light paths 32 corresponding to each human body sensing unit 31 are located on the conical surface corresponding to the same cone. The intersection point O" is located on the central axis 34 of the rotating surface, which means that the maximum illumination distance a on the illumination light paths 32 corresponding to each human body sensing unit 31 is the same, which improves the consistency of the sensing distance corresponding to the human body sensing function in all directions. Within the sensing angle range, at the maximum sensing distance, there is no sensing dead angle, ensuring that the presence of the user can be sensed in the target sensing space, effectively improving the human-computer interaction experience.

[0072] And, a plurality of human body sensing units 31 are disposed on the same rotating curved surface. For example, Figure 5 The rotating curved surface shown can be the side surface of a truncated cone, and each human body sensing unit 31 can be evenly distributed on the generatrix of the side surface of the truncated cone. The reverse extension line of the generatrix of the side surface of the truncated cone has a common intersection point P. And the reverse extension line direction of the generatrix of the side surface of the truncated cone is perpendicular to the reverse extension line direction of the illumination light path 32 corresponding to the human body sensing unit 31. In this way, the shape and parameters of the rotating curved surface can be further constrained to facilitate the subsequent reasonable design of the arrangement position of the human body sensing unit 31 to avoid the occurrence of sensing dead angles within the sensing angle and sensing distance range. In addition, in a specific embodiment, the intersection O" is located on the central axis 34 of the rotating curved surface, and the intersection P is also located on the central axis 34 of the rotating curved surface.

[0073] It should be noted that, on the illumination light path 32 corresponding to the human body sensing unit 31, and on the reverse extension line of the illumination light path 32 corresponding to the human body sensing unit 31, the distance between the intersection point O" and the human body sensing unit 31 is much smaller than the length of the illumination light path 32 corresponding to the human body sensing unit 31, or in other words, the distance between the intersection point O" and the human body sensing unit 31 is much smaller than the length of the maximum illumination distance a of the human body sensing unit 31 on the corresponding illumination light path 32, and the distance between the intersection point O" and the human body sensing unit 31 can be ignored. In this way, in the subsequent understanding and calculation, Figure 5 The intersection point O" shown is Figure 3 The vertex O' shown can be approximately understood as the same point.

[0074] Optionally, continue to refer to Figure 1 and Figure 2 The range hood is installed with its back against a wall, and each human body sensing unit 31 in the human body sensing module 30 is arranged on a side of the casing 10 away from the wall.

[0075] Specifically, the range hood is installed with its back against the wall, that is, the user's cooking position is on the side of the range hood away from the wall. Each human body sensing unit 31 in the human body sensing module 30 is arranged on the side of the casing 10 away from the wall, so that the human body sensing unit 31 can sense the user's cooking position and whether the user exists in the target sensing space, thereby effectively improving the accuracy and precision of the human body sensing function.

[0076] It is understandable that the present embodiment is merely an example. Of course, the range hood may also be in other forms, and the position of the human body sensing unit 31 on the housing 10 may be selected according to the user's cooking position.

[0077] Optionally, continue to refer to Figure 5 The human body sensing unit 31 is an infrared tube or a laser sensor.

[0078] Specifically, when the human body sensing unit 31 is an infrared pair tube, the human body sensing unit 31 includes an infrared emitting head 311 and an infrared receiving head 312. Alternatively, when the human body sensing unit 31 is a laser sensor, the human body sensing unit 31 includes a laser emitter 313 and a laser receiver 314. This embodiment does not limit the specific composition of the human body sensing unit 31, and the human body sensing unit 31 can be composed of a light source emitting element and a receiving element capable of receiving the reflected light source signal.

[0079] Figure 6 yes Figure 5 The schematic diagram of the electrical connection between the human body sensing module and the main control board is shown in FIG. Figure 5 and Figure 6 As shown, at this time, each human body sensing unit 31 in the human body sensing module 30 can be understood as a centralized arrangement, and multiple human body sensing units 31 are arranged on the same rotating curved surface. For example, Figure 5 and Figure 6The rotating curved surface shown can be the side surface of a truncated cone, and each human body sensing unit 31 can be evenly distributed on the generatrix of the side surface of the truncated cone, and the truncated cone can be a support. On the side surface of the support, that is, on the side surface of the truncated cone, a flexible circuit board 35 is arranged, and each human body sensing unit 31 is electrically and fixedly connected to the flexible circuit board 35. In addition, the flexible circuit board 35 is also electrically connected to the main control board 20. For example, the main control board 20 can power each human body sensing unit 31 through the flexible circuit board 35 to ensure the normal operation of each human body sensing unit 31. The main control board 20 can also quickly determine the sensing results such as the user's approach or distance, the user's movement or stillness, and the relative position of the user and the range hood based on the real-time information of each human body sensing unit 31. The following is only described by taking the human body sensing unit 31 as an infrared pair tube as an example. The human body sensing unit 31 includes an infrared transmitter head 311 and an infrared receiver head 312. The infrared emitting head 311 and the infrared receiving head 312 are both located on the flexible circuit board 35, that is, the infrared emitting head 311 and the infrared receiving head 312 are distributed on the side surface of the truncated cone, and the reverse extension lines of the irradiation light path 32 corresponding to the infrared emitting head 311 have a common intersection O", and the intersection O" is located on the central axis 34 of the rotating surface. In a specific embodiment, for the same group of infrared emitting heads 311 and infrared receiving heads 312, the infrared emitting heads 311 and the infrared receiving heads 312 can be located on the same generatrix of the side surface of the truncated cone.

[0080] Figure 7 is a structural schematic diagram of another human body sensing module provided by an embodiment of the utility model, Figure 8 yes Figure 7 The schematic diagram of the electrical connection between the human body sensing module and the main control board is shown in FIG. Figure 7 and Figure 8 As shown, at this time, the human body sensing units 31 in the human body sensing module 30 can be understood as a distributed arrangement, and multiple human body sensing units 31 are arranged on the same rotating curved surface. For example, Figure 7 and Figure 8The rotating curved surface shown can be the side surface of a truncated cone, and each human body sensing unit 31 can be evenly distributed on the generatrix of the side surface of the truncated cone, and the truncated cone can be a support. On the side surface of the support, that is, on the side surface of the truncated cone, a plurality of sensor detection plates 36 are arranged, and the number of sensor detection plates 36 is the same as the number of human body sensing units 31, and the human body sensing units 31 are electrically connected and fixedly connected to the sensor detection plates 36 one by one. In addition, each sensor detection plate 36 is electrically connected to the same sensor main board 37, and the sensor main board 37 is also electrically connected to the main control board 20. For example, the main control board 20 can power each human body sensing unit 31 through the sensor main board 37 and the corresponding sensor detection plate 36 to ensure the normal operation of each human body sensing unit 31. The main control board 20 can also quickly determine the sensing results such as the user's approach or distance, the user's movement or stillness, and the relative position of the user and the range hood according to the real-time information of each human body sensing unit 31. The following is only described by taking the human body sensing unit 31 as an infrared pair tube as an example. The human body sensing unit 31 includes an infrared emitting head 311 and an infrared receiving head 312. The infrared emitting head 311 and the infrared receiving head 312 of the same group are located on the corresponding sensor detection board 36, and the infrared emitting head 311 and the infrared receiving head 312 are distributed on the side surface of the truncated cone, and the reverse extension line of the irradiation light path 32 corresponding to the infrared emitting head 311 has a common intersection O", and the intersection O" is located on the central axis 34 of the rotating surface. In a specific embodiment, for the infrared emitting head 311 and the infrared receiving head 312 of the same group, the infrared emitting head 311 and the infrared receiving head 312 can be located on the same generatrix of the side surface of the truncated cone.

[0081] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A range hood, characterized in that: It comprises a housing (10), a main control board (20) and a human body sensing module (30), wherein the human body sensing module (30) is arranged on the housing (10); The human body sensing module (30) comprises a plurality of human body sensing units (31), and the plurality of human body sensing units (31) are electrically connected to the main control board (20); A plurality of human body sensing units (31) are arranged on the same rotating curved surface, each of the human body sensing units (31) is arranged in a different orientation, each of the human body sensing units (31) forms a first installation inclination angle ∠A with the plane where the range hood is located, and each of the human body sensing units (31) is inclined toward the ground according to the first installation inclination angle ∠A to form a corresponding irradiation light path (32); The area between adjacent illumination light paths (32) constitutes a corresponding illumination area (33), and the illumination area (33) constitutes a target sensing space below the range hood for realizing a human body sensing function.

2. The range hood according to claim 1, characterized in that: Each of the human body sensing units (31) is located at the same horizontal height h1; The irradiation area (33) is at least a partial conical surface, and the target sensing space is composed of a target horizontal plane and the conical surface; wherein the horizontal height h2 of the target horizontal plane is determined based on the statistical value of the user's height.

3. The range hood according to claim 2, characterized in that: The maximum irradiation distance a of each human body sensing unit (31) on the corresponding irradiation light path (32) satisfies the formula: Among them, h1-h2 is the target detection height corresponding to the target sensing space, c is the target horizontal detection distance, and the target horizontal detection distance c is the radius of the positive projection of the cone surface on the target horizontal plane.

4. The range hood according to claim 3, characterized in that: The orthographic projection of the cone surface on the target horizontal plane is a first sector shape, and the angle of the first sector shape is ∠D; In the conical surface, two adjacent illumination light paths (32) form a second sector shape, and the included angle of the second sector shape is ∠J; The orthographic projection of the second sector shape on the target horizontal plane is a third sector shape, the arc corresponding to the second sector shape is the same as the arc corresponding to the third sector shape, and the included angle of the third sector shape is ∠B; Wherein, the number of the human body sensing units (31) is determined based on the ∠D and the ∠B.

5. The range hood according to claim 4, characterized in that: The ∠B satisfies the formula ∠B=2×arcsin[e / (2×c)]; wherein e is the chord length of the arc corresponding to the third sector shape where the ∠B is located on the target horizontal plane; If the formula ∠D / ∠B=M is ​​satisfied, and M is an integer, then the number f of the human body sensing units (31) is ≥M+1.

6. The range hood according to claim 4, characterized in that: The ∠B satisfies the formula ∠B=2×arcsin[e / (2×c)]; wherein e is the chord length of the arc corresponding to the third sector shape where the ∠B is located on the target horizontal plane; If the formula ∠D / ∠B=M...X is satisfied, M is an integer, and X is a remainder, then the number f of the human body sensing units (31) is ≥M+2.

7. The range hood according to claim 4, characterized in that: The ∠J satisfies the formula Wherein, e is the chord length of the arc corresponding to the third sector shape where ∠B is located on the target horizontal plane.

8. The range hood according to any one of claims 1 to 4, characterized in that: The reverse extension lines of the illumination light paths (32) corresponding to the human body sensing units (31) have a common intersection, and the intersection is located on the central axis (34) of the rotation curved surface.

9. The range hood according to any one of claims 1 to 7, characterized in that: The range hood is installed with its back against a wall, and each of the human body sensing units (31) in the human body sensing module (30) is arranged on a side of the housing (10) away from the wall.

10. The range hood according to any one of claims 1 to 7, characterized in that: The human body sensing unit (31) is an infrared tube or a laser sensor.

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