CN112253814B

CN112253814B - Electric check valve for range hood and control method thereof

Info

Publication number: CN112253814B
Application number: CN202010985785.8A
Authority: CN
Inventors: 余丹阳; 王智捷; 李永波; 姚家前; 潘叶江
Original assignee: Vatti Co Ltd
Current assignee: Vatti Co Ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2022-09-13
Anticipated expiration: 2040-09-18
Also published as: CN112253814A

Abstract

The invention discloses an electric check valve for a range hood and a control method thereof, wherein the electric check valve for the range hood is positioned on a smoke discharge flue of the range hood and comprises a check valve body, a current detection unit, a wind pressure detection unit, a controller and a power supply unit, wherein the current detection unit, the wind pressure detection unit and the power supply unit are all connected with the input end of the controller, the output end of the controller is connected with the check valve body, and the current detection unit is connected with the power supply unit. When the current detection unit monitors the current of the range hood to change, the wind pressure detection unit detects the wind pressure of the air inlet, whether the range hood is in a smoke exhaust state or not under the wind pressure condition is judged, when the range hood is in the smoke exhaust state, the check valve body is opened to exhaust smoke, otherwise, the check valve body is closed; compared with the traditional method that whether the smoke discharging state of the smoke machine is judged only by depending on current change, the reliability is higher, and the situation that the smoke discharging function of the smoke machine is not used and the electric check valve is opened mistakenly when other functions influencing current change are used is avoided.

Description

Electric check valve for range hood and control method thereof

Technical Field

The invention belongs to the technical field of smoke exhaust equipment of range hoods, and particularly relates to an electric check valve for a range hood and a control method of the electric check valve.

Background

At present, a common flue is generally designed in a high-rise residence, smoke is discharged from each floor through the common flue, and a check valve is generally installed at a branch pipe in order to prevent smoke returning and odor tainting of users.

The check valve is divided into a mechanical type and an electric type, wherein the basic function of the electric check valve is that the cigarette machine is started, the valve plates are linked to be opened, the cigarette machine is closed, and the valve plates are tightly closed, so that the effect of preventing the smoke from returning and tainting the odor is achieved. The principle is as follows: after the range hood is started, the detection module learns that the load current passes through, the check valve is opened in a linkage mode, otherwise, the check valve is not opened, and whether the check valve needs to be opened or not is judged by detecting the change of the current; the disadvantages of this approach are: when the lighting function of the range hood is used, the electric check valve is opened when the system mistakenly thinks that the range hood starts to work due to the change of the current; therefore, the phenomenon that the electric check valve is opened by mistake is easily caused by the traditional scheme, and the user experience is influenced.

Disclosure of Invention

In order to solve the problems, the invention provides the electric check valve for the range hood, which increases the judgment of the wind pressure on the basis of judging whether the range hood works or not by the traditional current and solves the problem of easy misjudgment in the prior art.

The invention also discloses a control method of the electric check valve.

The technical scheme adopted by the invention is as follows:

the utility model provides an electronic check valve for cigarette machine, its is located the discharge flue of cigarette machine, including check valve body, current detection unit, wind pressure detecting element, controller and power supply unit, current detection unit, wind pressure detecting element and power supply unit all are connected with the input of controller, the output and the check valve body coupling of controller, current detection unit is connected with power supply unit.

Preferably, the check valve body includes casing, valve block, pivot and driving motor, the pivot is fixed in the casing, the valve block sets up in the pivot, driving motor and valve block are connected and are used for driving the valve block and rotate along the pivot.

Preferably, the wind pressure detection unit includes pressure taking port, wind pressure sensor and hose, pressure taking port is seted up on the casing and is located the air intake of electronic check valve, wind pressure sensor passes through the hose and connects with pressure taking port.

Preferably, the controller is located in the control box, and the wind pressure detection unit is arranged in the control box.

Preferably, the wind pressure detecting unit further comprises a pressure small hole, and the pressure small hole is formed in the side surface of the control box and used for enabling the pressure in the control box to be consistent with the external pressure.

Preferably, a gap is reserved between the pressure taking port and a vertical surface where the center of the rotating shaft is located, wherein the rotating shaft is horizontally arranged.

Preferably, the width of the gap is not less than half of the diameter of the valve plate.

A control method of an electric check valve for a range hood applies the electric check valve, and specifically comprises the following steps:

s1, detecting whether the current of the cigarette machine changes through a current detection unit;

and S2, when the current of the range hood changes, detecting the pressure state of the check valve body through the wind pressure detection unit, and controlling the check valve body to be opened and closed according to the pressure state.

Preferably, in S2, when the cigarette machine current changes, it is determined whether the valve plate is in an open state, and when the valve plate is in the open state, the wind pressure detecting unit detects the pressure state of the check valve body, and controls the check valve body to open and close according to the pressure state, specifically:

s21, driving the valve piece to rotate by the driving motor;

s22, acquiring the pressure of the air inlet of the check valve body in real time through the air pressure sensor, and controlling the state of the valve plate according to the pressure difference, specifically:

when the pressure difference is positive, the driving motor drives the valve plate to rotate reversely, so that the valve plate is restored to the angle before the driving motor drives the valve plate to rotate; otherwise, the valve plate is closed;

wherein the pressure difference is the difference between the current pressure and the previous pressure.

Preferably, in S2, when the cigarette machine current changes, it is determined whether the valve plate is in an open state, and when the valve plate is in a non-open state, the wind pressure detecting unit detects a pressure state of the check valve body, and controls the check valve body to open and close according to the pressure state, specifically:

acquire the pressure of check valve body air intake through the wind pressure sensor in real time to according to the state of pressure difference control valve block, specifically do:

s201, acquiring the pressure of an air inlet of a check valve body in real time through a wind pressure sensor;

s202, controlling the state of the valve plate according to the pressure difference, specifically comprising the following steps:

when the pressure difference is positive and the real-time pressure is positive pressure, the valve plate is opened; otherwise, the valve plate keeps a non-opening state;

Compared with the prior art, when the electric check valve for the range hood works, the current detection unit monitors whether the current of the range hood changes in real time, when the current changes, the wind pressure detection unit detects the wind pressure of the air inlet, the range hood is in a smoke exhaust state under the wind pressure condition, when the range hood is in the smoke exhaust state, the controller controls the check valve body to be opened to exhaust smoke, otherwise, the check valve body is closed;

compared with the traditional method of judging whether the cigarette machine is in a smoke discharging state only by depending on current change, the method has higher reliability, and avoids the situation that the smoke discharging function of the cigarette machine is not used, and other functions (such as starting an illuminating lamp on the cigarette machine) influencing the current change cause the false opening of the electric check valve when in use.

Drawings

FIG. 1 is a schematic block diagram of an electric check valve for a range hood according to embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of an electric check valve for a range hood provided by the embodiment 1 of the invention;

FIG. 3 is a schematic structural view of another orientation of an electric check valve for a range hood according to embodiment 1 of the present invention;

fig. 4 is a front view of a check valve body in an electric check valve for a range hood according to embodiment 1 of the present invention;

figure 5 is a side view of an electric check valve suspension check valve body for a range hood provided in embodiment 1 of the present invention;

fig. 6 is a flowchart of a control method of an electric check valve according to embodiment 2 of the present invention.

The air pressure detection device comprises a check valve body 1, a current detection unit 2, a wind pressure detection unit 3, a controller 4, a power supply unit 5, a control box 6, a shell 11, a valve plate 12, a rotating shaft 13, a driving motor 14, a pressure taking port 31, a wind pressure sensor 32, a hose 33 and a pressure through small hole 34.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or member to which the present invention is directed must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

Example 1

The embodiment 1 of the invention provides an electric check valve for a range hood, which is positioned on a smoke exhaust flue of the range hood, and as shown in fig. 1, the electric check valve comprises a check valve body 1, a current detection unit 2, a wind pressure detection unit 3, a controller 4 and a power supply unit 5, wherein the current detection unit 2, the wind pressure detection unit 3 and the power supply unit 5 are all connected with the input end of the controller 4, the output end of the controller 4 is connected with the check valve body 1, and the current detection unit 2 is connected with the power supply unit 5;

thus, by adopting the structure, when the electric check valve works, the current detection unit 2 monitors whether the current of the smoke machine changes in real time, when the current changes, the wind pressure detection unit 3 detects the wind pressure of the wind inlet again, the smoke machine is in a smoke discharging state under the condition of wind pressure, when the smoke machine is in the smoke discharging state, the controller 4 controls the check valve body 1 to be opened for smoke discharging, otherwise, the check valve body 1 is closed;

the smoke exhaust device judges whether the smoke exhaust machine is in a smoke exhaust state or not through combination of double indexes of current and wind pressure, and further controls the working state of the check valve, compared with the traditional method that whether the smoke exhaust machine is in the smoke exhaust state or not only through current change, the reliability of double parameters is higher, and the situation that the smoke exhaust function of the smoke exhaust machine is not used, and the electric check valve is opened mistakenly when other functions (such as starting an illuminating lamp on the smoke exhaust machine) influencing the current change are used is avoided.

In a specific embodiment, as shown in fig. 2-4, the check valve body 1 includes a housing 11, a valve plate 12, a rotating shaft 13 and a driving motor 14, the rotating shaft 13 is fixed in the housing 11, the valve plate 12 is disposed on the rotating shaft 13, and the driving motor 14 and the valve plate 12 are connected to drive the valve plate 12 to rotate along the rotating shaft 13;

thus, when the valve plate 12 needs to be opened, the driving motor 14 rotates forwards to drive the valve plate 12 to rotate along the rotating shaft 13, so that the valve plate 12 in the shell 11 is opened, and at the moment, the shell 11 is communicated with an oil smoke channel arranged between the range hood and the check valve body 1, so that oil smoke is discharged;

on the contrary, when the valve plates 12 need to be closed, the driving motor 14 rotates reversely to drive the valve plates 12 to rotate along the rotation, so that the valve plates 12 in the shell 11 are completely closed, at the moment, the oil smoke channel between the shell 11 and the smoke machine and the check valve body 1 is cut off by the valve plates 12, the oil smoke channel is closed, and the oil smoke can be prevented from flowing backwards.

In a specific embodiment, the wind pressure detecting unit 3 includes a pressure taking port 31, a wind pressure sensor 32 and a hose 33, the pressure taking port 31 is provided on the housing 11 and is located at an air inlet of the electric check valve, and the wind pressure sensor 32 is connected to the pressure taking port 31 through the hose 33;

thus, since the wind pressure sensor 32 is communicated with the air inlet of the electric check valve through the hose 33 and the pressure taking port 31, the wind pressure with the air inlet can be detected by the wind pressure sensor 32.

In a specific embodiment, the controller 4 is located in a control box 6, and the wind pressure detecting unit 3 is arranged in the control box 6;

in the cigarette machine, in order to make the structure neat, the parts (driving plate, single chip microcomputer, etc.) related to driving are all put in the control box 6, and the control box 6 is a sealed box (except the hole for connecting wire opened on the box body);

in this embodiment, in order to make the structure more orderly, without adding additional scattered small parts, the wind pressure detecting unit 3 is disposed in the control box 6, so that the integration degree of the whole device is higher.

However, when the wind pressure detecting unit 3 is disposed in the control box 6, since the control box 6 is basically a sealed box, which is different from the external pressure, the measurement accuracy of the wind pressure sensor 32 is affected, and in order to ensure the measurement accuracy of the wind pressure sensor, the wind pressure detecting unit 3 further includes a pressure aperture 34, and the pressure aperture 34 is opened at the side of the control box 6 for keeping the pressure in the control box 6 consistent with the external pressure.

As shown in fig. 5, in the present embodiment, the rotating shaft 13 is horizontally arranged, a gap is left between the pressure taking port 31 and a vertical plane where the center of the rotating shaft 13 is located, and the width of the gap is not less than half of the diameter of the valve sheet 12, such as Δ d in fig. 5;

the significance of this is: the wind pressure close to the rotating shaft 13 has a high speed, so that the wind pressure is relatively dispersed and backflow can be generated, and therefore, if the pressure taking port 31 is arranged on a vertical surface where the center of the rotating shaft 13 is located, pressure taking is unstable;

the oil stain accumulation at the non-overhead position is more than that at other places, and the collection of the wind pressure is also influenced.

The working process of the embodiment:

firstly, connecting power lines of the smoke machine which needs to be connected in parallel to operate through an overcurrent detection unit 2 to detect current in real time, and when the current changes, proving that certain functions in the smoke machine are in an open state, but which functions are unknown;

secondly, when the current of the cigarette machine changes, the state of the valve plate 12 is judged according to the state of the driving motor 14, when the valve plate 12 is in an open state, the driving motor 14 drives the valve plate 12 to rotate, the pressure of an air inlet of the check valve body 1 is obtained in real time through the air pressure sensor 32, when the pressure difference is positive, the opening of the smoke exhausting function of the cigarette machine is proved, the driving motor 14 drives the valve plate 12 to rotate reversely, and the valve plate 12 is recovered to the angle before the driving motor 14 drives the valve plate 12 to rotate; otherwise, the valve plate 12 is closed;

when the valve plate 12 is in a non-opening state, the pressure of the air inlet of the check valve body 1 is obtained in real time through the air pressure sensor 32, when the pressure difference is positive and the real-time pressure is positive, the smoke exhaust function of the range hood is proved to be opened, and then the valve plate 12 is opened; whereas the valve plate 12 remains in the non-open state.

This embodiment is through at first judging whether the electric current changes, and whether the condition of the wind pressure of the air intake of rethread judgement check valve confirms the cigarette machine whether function of discharging fume is opened, gets into the state of control valve block, combines together through the dual index of electric current and wind pressure and has solved the problem that prior art misjudged easily

Example 2

Embodiment 2 of the present invention provides a control method of an electric check valve, as shown in fig. 6, which applies the electric check valve for a range hood described in embodiment 1, and specifically includes the following steps:

s1, detecting whether the current of the cigarette machine changes through the current detection unit 2;

specifically, the power supply unit 5 supplies power to the electric check valve through a power line, and the current detection unit 2 is connected with the power line of the cigarette machine which needs to run in parallel to detect current in real time;

and S2, when the current of the range hood changes, detecting the pressure state of the check valve body 1 through the wind pressure detecting unit 3, and controlling the check valve body 1 to open and close according to the pressure state.

Therefore, the change condition of the current is firstly detected, then the pressure state of the check valve body 1 is detected, and the current and the pressure are matched to determine whether the range hood is in the oil smoke exhaust state, so that the method has higher reliability.

Specifically, in S2, when the cigarette machine current changes, it is determined whether the valve sheet 12 is in an open state;

because the opening of the valve plate 12 is controlled by the driving motor 14, the state of the driving motor 14 is stored in the controller 4, and therefore, whether the valve plate 12 is in the open state can be judged by the controller 4;

when the valve plate 12 is in the open state, in order to judge whether the opening of the valve plate 12 is mistakenly opened, namely whether the opening of the valve plate is because of the smoke exhaust function of the range hood at the moment is judged, the following steps are required to be carried out:

detect the pressure state of check valve body 1 through wind pressure detecting element 3 to according to opening and closing of pressure state control check valve body 1 specifically do:

s21, driving the valve plate 12 to rotate by the driving motor 14;

s22, the pressure of the air inlet of the check valve body 1 is obtained in real time through the air pressure sensor 32, and the state of the valve plate 12 is controlled according to the pressure difference, specifically:

when the pressure difference is positive, the driving motor 14 drives the valve plate 12 to rotate reversely, so that the valve plate is restored to the angle before the driving motor 14 drives the valve plate 12 to rotate; otherwise, the valve plate 12 is closed;

Thus, when the valve body 12 is in the open state, the pressure state of the check valve body 1 is detected through the wind pressure detection unit 3, if the pressure is increased, the existence of wind pressure at the air inlet of the check valve is proved, and then the smoke exhaust function of the cigarette machine is proved to be used, and at the moment, the opening angle before the valve plate 12 is restored for smoke exhaust.

In addition, in S2, when the cigarette maker current changes, it is determined whether the valve plate 12 is in the open state, and when the valve plate is in the non-open state, in order to ensure that the state of the valve plate matches the state of the cigarette maker, the following steps are required:

the pressure of the air inlet of the check valve body 1 is obtained in real time through the air pressure sensor 32, and the state of the valve plate 12 is controlled according to the pressure difference, specifically:

s201, acquiring the pressure of an air inlet of the check valve body 1 in real time through the air pressure sensor 32;

s202, controlling the state of the valve plate 12 according to the pressure difference, specifically:

when the pressure difference is positive and the real-time pressure is positive pressure, the valve plate 12 is opened; otherwise, the valve plate 12 keeps a non-opening state;

Thus, when the valve body 12 is in a non-opening state, the pressure state of the check valve body 1 is detected through the wind pressure detection unit 3, if the pressure is increased and is positive pressure, the existence of wind pressure at the air inlet of the check valve is proved, and further the smoke exhaust function of the cigarette machine is proved to be used, the valve plate 12 is opened at the moment to exhaust smoke, otherwise, the valve plate 12 is kept in a closed state.

In addition, because electronic check valve operational environment is abominable, if wind pressure sensor 32 goes wrong, the user can switch to pure electric current monitoring mechanism, and the basic flow of control this moment is:

the current of the range hood is detected through a current detection unit 2;

when the current is larger than the preset current threshold value, the valve plate 12 is opened, otherwise, the valve plate 12 is closed.

The setting of the current threshold value can be performed in the following two ways:

1) the product is directly set during production, and is generally about 250 mA;

2) when the wind pressure sensor 32 is not failed, the controller 4 records the minimum current value when the starting valve sheet is opened, and the current value is the current threshold value.

The embodiment firstly detects the change condition of the current, then detects the pressure state of the check valve body, and combines the current and the pressure to determine whether the range hood is in the state of oil smoke discharge, thereby having higher reliability.

While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an electronic check valve for cigarette machine, its is located the discharge flue of cigarette machine, a serial communication port, including check valve body (1), current detection unit (2), wind pressure detecting element (3), controller (4) and power supply unit (5), current detection unit (2), wind pressure detecting element (3) and power supply unit (5) all are connected with the input of controller (4), the output and the check valve body (1) of controller (4) are connected, current detection unit (2) are connected with power supply unit (5), wind pressure detecting element (3) are used for detecting the pressure of check valve body (1) air intake.

2. An electric check valve for a cigarette machine according to claim 1, characterized in that the check valve body (1) comprises a housing (11), a valve plate (12), a rotating shaft (13) and a driving motor (14), the rotating shaft (13) is fixed in the housing (11), the valve plate (12) is arranged on the rotating shaft (13), and the driving motor (14) and the valve plate (12) are connected for driving the valve plate (12) to rotate along the rotating shaft (13).

3. An electric non-return valve for a cigarette making machine according to claim 2 characterized in that said wind pressure detecting unit (3) comprises a pressure taking port (31), a wind pressure sensor (32) and a hose (33), said pressure taking port (31) is opened on the housing (11) and located at the air inlet of the electric non-return valve, said wind pressure sensor (32) is connected with the pressure taking port (31) through the hose (33).

4. An electric non-return valve for a range hood according to claim 3, characterized in that said controller (4) is located in a control box (6) and said wind pressure detecting unit (3) is arranged in the control box (6).

5. An electric non-return valve for a cigarette making machine according to claim 4, characterized in that said wind pressure detecting unit (3) further comprises a pressure aperture (34), said pressure aperture (34) being opened at the side of the control box (6) for keeping the pressure inside the control box (6) consistent with the ambient pressure.

6. An electric non-return valve for a cigarette making machine according to any of claims 3-5, characterized in that a gap is left between the pressure tapping (31) and the vertical plane where the centre of the rotating shaft (13) is located, wherein the rotating shaft (13) is arranged horizontally.

7. An electric non-return valve for a cigarette making machine according to claim 6, characterized in that the width of said gap is not less than half the diameter of the valve plate (12).

8. A control method of an electric check valve for a range hood, characterized in that it applies the electric check valve for a range hood according to any one of claims 1 to 7, comprising the steps of:

s1, detecting whether the current of the cigarette machine changes through the current detection unit (2);

and S2, when the current of the range hood changes, detecting the pressure state of the check valve body (1) through the wind pressure detecting unit (3), and controlling the check valve body (1) to be opened and closed according to the pressure state.

9. The control method of an electric check valve according to claim 8, wherein in S2, when the current of the range hood changes, it is determined whether the valve sheet (12) is in an open state, and when the valve sheet is in the open state, the wind pressure detecting unit (3) detects the pressure state of the check valve body (1), and controls the check valve body (1) to open and close according to the pressure state, specifically:

s21, driving the valve plate (12) to rotate by the driving motor (14);

s22, the pressure of the air inlet of the check valve body (1) is obtained in real time through the air pressure sensor (32), and the state of the valve plate (12) is controlled according to the pressure difference, specifically:

when the pressure difference is positive, the driving motor (14) drives the valve plate (12) to rotate reversely, so that the valve plate is restored to the angle before the driving motor (14) drives the valve plate (12) to rotate; otherwise, the valve plate (12) is closed;

10. The control method of an electric check valve according to claim 8 or 9, wherein in S2, when the range hood current changes, it is determined whether the valve plate (12) is in an open state, and when it is in a non-open state, the wind pressure detecting unit (3) detects the pressure state of the check valve body (1), and controls the check valve body (1) to open and close according to the pressure state, specifically:

s201, acquiring the pressure of an air inlet of the check valve body (1) in real time through a wind pressure sensor (32);

s202, controlling the state of the valve plate (12) according to the pressure difference, specifically:

when the pressure difference is positive and the real-time pressure is positive, the valve plate (12) is opened; otherwise, the valve plate (12) is kept in a non-opening state;