CN219242633U - Oil smoke backflow prevention device for flue and range hood - Google Patents

Abstract

The embodiment of the utility model provides an oil smoke prevention backflow device for a flue and a range hood, which belong to the field of oil smoke treatment, and the oil smoke prevention backflow device for the flue comprises the following components: the exhaust pipe is connected with the exhaust pipe of the range hood, the exhaust end of the U-shaped pipeline is connected with the exhaust main pipe, the liquid inlet pipe is arranged at the bottom of the U-shaped pipeline, and a liquid inlet valve is arranged between the liquid inlet pipe and the U-shaped pipeline; the liquid discharge pipe is arranged at the bottom of the U-shaped pipeline, and a liquid discharge valve is arranged between the liquid discharge pipe and the U-shaped pipeline; the automatic water changing mechanism is electrically connected with the liquid inlet valve and the liquid discharge valve respectively and is used for controlling the opening and closing of the liquid inlet valve and the liquid discharge valve; the control circuit is electrically connected with the liquid inlet valve, the liquid outlet valve and the automatic water changing mechanism respectively and used for controlling the liquid inlet valve, the liquid outlet valve and the automatic water changing mechanism to work. According to the utility model, the U-shaped pipeline adopts a liquid sealing mode, so that the oil smoke in the oil smoke main exhaust pipe can be effectively prevented from flowing back into the range hood.

Description

Oil smoke backflow prevention device for flue and range hood

Technical Field

The utility model relates to the technical field of oil fume treatment, in particular to an oil fume backflow prevention device for a flue and an oil fume exhauster.

Background

Kitchen fumes have a certain harm to human body. While kitchen fumes have two sources: firstly, the cooking of the kitchen ventilator generates oil smoke, and secondly, the kitchen ventilator is used for pouring the oil smoke. Along with the continuous lifting of the total height and floors of residential buildings, the pressure of the oil smoke total exhaust pipe is larger and larger, and even the oil smoke machine can be returned, so that the health of a human body is continuously influenced.

The existing oil smoke backflow prevention device for the flue mainly adopts a mechanical check valve and an electric butterfly valve. The mechanical check valve is the most common device used by domestic residents at present, but after the device is used for a period of time, the condition that the sealing surface of the check plate closing member cannot be completely sealed due to oil stain sticking can occur, and even the condition that the closing member is blocked and cannot be normally closed due to excessive oil stain sticking can occur, so that the reverse smoke prevention effect of the mechanical check valve is gradually deteriorated and even completely fails. The electric butterfly valve is driven by the motor to open and close the butterfly valve, so that the electric butterfly valve has no problem of complete locking compared with a mechanical check valve, but still has the problem that the sealing surface of the opening and closing valve flap is smeared with oil so that the electric butterfly valve cannot be completely sealed and air leakage occurs.

The utility model provides an oil smoke backflow prevention device for a flue and a range hood, which can effectively prevent backflow of oil smoke into a kitchen.

Disclosure of Invention

The embodiment of the utility model aims to provide an oil smoke backflow prevention device for a flue and a range hood.

In order to achieve the above object, in a first aspect, an embodiment of the present utility model provides an oil smoke prevention backflow device for a flue, including:

the exhaust pipe is connected with the exhaust pipe of the range hood, and the exhaust end of the U-shaped pipeline is connected with the exhaust main pipe;

the liquid inlet pipe is arranged at the bottom of the U-shaped pipeline and is communicated with the inside of the U-shaped pipeline through a liquid inlet end of the U-shaped pipeline, and a liquid inlet valve is arranged on a liquid inlet pipeline of the liquid inlet pipe;

the liquid discharge pipe is arranged at the bottom of the U-shaped pipeline and is communicated with the inside of the U-shaped pipeline through a liquid discharge end of the U-shaped pipeline, and a liquid discharge valve is arranged on the liquid discharge pipe of the liquid discharge pipe;

the automatic water changing mechanism is electrically connected with the liquid inlet valve and the liquid discharge valve respectively and used for controlling the opening and closing of the liquid inlet valve and the liquid discharge valve;

and the control circuit is electrically connected with the liquid inlet valve, the liquid outlet valve and the automatic water changing mechanism respectively and used for controlling the liquid inlet valve, the liquid outlet valve and the automatic water changing mechanism to work.

Preferably, a first liquid level sensor and a second liquid level sensor are further arranged in the U-shaped pipeline, the first liquid level sensor is arranged on the outer wall of the exhaust end of the U-shaped pipeline, and the second liquid level sensor is arranged on the outer wall of the bottom of the U-shaped pipeline.

Preferably, the control circuit includes a current relay and a power adapter;

the alternating current input end of the power adapter is connected with alternating current, and the direct current output end of the power adapter is respectively connected with the current relay, the first liquid level sensor, the second liquid level sensor, the liquid discharge valve and the liquid inlet valve.

The current setting end of the current relay is connected in series with a range hood power supply, one end of the current relay coil and the common end of the current relay are connected with the positive electrode output end of the power adapter, the other end of the current relay coil is connected with the negative electrode output end of the power adapter, the normally closed end of the current relay is connected with the positive electrode input end of the first liquid level sensor, and the normally open end of the current relay is connected with the positive electrode input end of the second liquid level sensor;

the negative electrode input end of the first liquid level sensor is connected with the negative electrode output end of the power adapter, the signal feedback end of the first liquid level sensor is connected with the positive electrode input end of the liquid inlet valve, and the negative electrode input end of the liquid inlet valve is connected with the negative electrode output end of the power adapter;

the negative electrode input end of the second liquid level sensor is connected with the negative electrode output end of the power adapter, the signal feedback end of the second liquid level sensor is connected with the positive electrode input end of the liquid discharge valve, and the negative electrode input end of the liquid discharge valve is connected with the negative electrode output end of the power adapter.

Preferably, the automatic water changing mechanism comprises a time control switch, a time relay and a first intermediate relay,

the positive electrode input end and the signal input end of the power supply of the time control switch are connected with the positive electrode output end of the power supply adapter, the negative electrode input end of the power supply of the time control switch is connected with the negative electrode input end of the power supply adapter, and the signal output end of the time control switch is connected with one end of the time relay coil;

the other end of the time relay coil is connected with the negative electrode output end of the power adapter, the public end of the time relay is connected with the signal output end of the time control switch, and the normally closed end of the time relay is connected with the positive electrode input end of the second liquid level sensor;

the negative pole output of power adapter is connected to the one end of first intermediate relay coil, the other end of first intermediate relay coil is connected second level sensor's signal feedback end, the first common end of first intermediate relay is connected the positive pole output of power adapter, the first normal open end of first intermediate relay is connected second level sensor's positive pole output, the first normal close end of first intermediate relay is connected power adapter, the second common end of first intermediate relay is connected the normal close end of current relay, the second normal close end of first intermediate relay is connected first level sensor's positive pole input.

Preferably, a third liquid level sensor is further arranged in the U-shaped pipeline, the third liquid level sensor is arranged on the outer wall of the air inlet end of the U-shaped pipeline and used for monitoring the highest limit of the liquid level in the U-shaped pipeline, the positive electrode input end of the third liquid level sensor is connected with the positive electrode output end of the power adapter, the negative electrode input end of the third liquid level sensor is connected with the negative electrode output end of the power adapter, and the signal feedback end of the third liquid level sensor is connected with the positive electrode input end of the liquid discharge valve.

Preferably, the oil fume backflow prevention device for the flue further comprises an alarm mechanism, the alarm mechanism is a buzzer, the positive electrode input end of the buzzer is connected with the signal feedback end of the third liquid level sensor, and the negative electrode input end of the buzzer is connected with the negative electrode output end of the power adapter.

Preferably, a first diode is connected in series between the signal feedback end of the third liquid level sensor and the positive electrode input end of the liquid discharge valve, and the first diode is conducted from the signal feedback end of the third liquid level sensor to the positive electrode input end of the liquid discharge valve.

Preferably, the signal feedback end of the second liquid level sensor and the positive electrode input end of the liquid discharge valve are connected in series with a second diode, and the second diode is conducted from the signal feedback end of the second liquid level sensor to the positive electrode input end of the liquid discharge valve.

Preferably, the oil fume backflow preventing device for the flue further comprises an anti-freezing mechanism, the anti-freezing mechanism is used for controlling liquid in the U-shaped pipeline to flow, the anti-freezing mechanism comprises a second intermediate relay and a double-control switch, one end of the second intermediate relay coil is connected with the signal feedback end of the first liquid level sensor through the double-control switch, the other end of the second intermediate relay coil is connected with the negative electrode output end of the power adapter, the public end of the second intermediate relay is connected with the positive electrode output end of the power adapter through the double-control switch, and the normally closed end of the second intermediate relay is connected with the positive electrode input end of the liquid discharge valve.

In a second aspect, an embodiment of the utility model provides a range hood, which comprises the oil smoke prevention backflow device for a flue.

According to the utility model, the U-shaped pipeline is connected with the range hood and the oil smoke total exhaust pipe, and the U-shaped pipeline adopts a liquid sealing mode, so that the oil smoke in the oil smoke total exhaust pipe can be effectively prevented from flowing back into the range hood.

Additional features and advantages of embodiments of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain, without limitation, the embodiments of the utility model. In the drawings:

fig. 1 is a schematic structural diagram of a smoke-proof backflow device for a flue according to embodiment 1 of the present utility model;

fig. 2 is a schematic diagram of a control circuit of a smoke-preventing backflow device for a flue according to embodiment 1 of the present utility model.

Description of the reference numerals

The device comprises a 1-U-shaped pipeline, a 2-liquid inlet pipe, a 3-liquid discharge pipe, a 4-liquid inlet valve, a 5-liquid discharge valve, a 6-first liquid level sensor, a 7-second liquid level sensor, an 8-third liquid level sensor, a 9-communicating pipe, a 10-power adapter, an 11-current relay, a 12-range hood power supply, a 13-time control switch, a 14-time relay, a 15-first intermediate relay, a 16-second intermediate relay, a 17-buzzer, an 18-double control switch, a 19-first diode, a 20-second diode and a 21-third diode.

Detailed Description

The following describes the detailed implementation of the embodiments of the present utility model with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

In the embodiments of the present utility model, unless otherwise indicated, terms such as "upper, lower, left, and right" and "upper, lower, left, and right" are used generally referring to directions or positional relationships based on those shown in the drawings, or those conventionally used in the use of the inventive products.

The terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

The terms "parallel", "perpendicular", and the like do not denote that the components are required to be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel than "perpendicular" and does not mean that the structures must be perfectly parallel, but may be slightly tilted.

The terms "horizontal," "vertical," "overhang," and the like do not denote that the component is required to be absolutely horizontal, vertical, or overhang, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

Furthermore, the terms "substantially," "essentially," and the like, are intended to be limited to the precise form disclosed herein and are not necessarily intended to be limiting. For example: the term "substantially equal" does not merely mean absolute equal, but is difficult to achieve absolute equal during actual production and operation, and generally has a certain deviation. Thus, in addition to absolute equality, "approximately equal to" includes the above-described case where there is a certain deviation. In other cases, the terms "substantially", "essentially" and the like are used in a similar manner to those described above unless otherwise indicated.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 1-2, in a first aspect, the present embodiment provides an oil smoke prevention backflow device for a flue, including:

the exhaust pipe of the range hood is connected with the air inlet end of the U-shaped pipeline 1, and the exhaust end of the U-shaped pipeline 1 is connected with an exhaust main pipe;

the liquid inlet pipe 2 is arranged at the bottom of the U-shaped pipeline 1 and is communicated with the inside of the U-shaped pipeline 1 through a liquid inlet end of the U-shaped pipeline 1, and a liquid inlet valve 4 is arranged on a liquid inlet pipeline of the liquid inlet pipe 2;

the liquid discharge pipe 3 is arranged at the bottom of the U-shaped pipeline 1 and is communicated with the inside of the U-shaped pipeline 1 through a liquid discharge end of the U-shaped pipeline 1, and a liquid discharge valve 5 is arranged on the liquid discharge pipe of the liquid discharge pipe 3;

the automatic water changing mechanism is respectively and electrically connected with the liquid inlet valve 4 and the liquid discharge valve 5 and is used for controlling the opening and closing of the liquid inlet valve 4 and the liquid discharge valve 5;

and the control circuit is electrically connected with the liquid inlet valve 4, the liquid outlet valve 5 and the automatic water changing mechanism respectively and used for controlling the liquid inlet valve 4, the liquid outlet valve 5 and the automatic water changing mechanism to work.

Specifically, when the range hood works, the range hood discharges kitchen oil smoke to an oil smoke total exhaust pipe of a corridor through the U-shaped pipeline 1; when the range hood does not work, liquid is injected into the U-shaped pipeline 1, and the oil smoke in the oil smoke main exhaust pipe is prevented from being poured back to the range hood in a liquid sealing mode.

The liquid supplementing of the U-shaped pipeline 1 can be realized by arranging the liquid inlet pipe 2 so as to form a seal. When the U-shaped pipeline 1 is filled with liquid to form a seal, the liquid level at the water inlet end of the U-shaped pipeline 1 is higher than the liquid level at the air outlet end due to the pressure influence of the oil smoke total air outlet pipe, so that a liquid level difference is formed.

The arrangement of the liquid discharge pipe 3 can realize the liquid discharge of the U-shaped pipeline 1 so as to ensure that the range hood works normally.

The control circuit is used for controlling the opening or closing of the liquid discharge valve 5 or the liquid inlet valve 4, when the control circuit controls the liquid inlet valve 4 to be opened, the U-shaped pipeline 1 supplements liquid, sealing liquid enters the U-shaped pipeline 1 through the liquid inlet pipe 2, and when the control circuit controls the liquid discharge valve 5 to be opened, the U-shaped pipeline 1 discharges liquid, and the sealing liquid is discharged from the U-shaped pipeline 1.

In this embodiment, one end of the liquid inlet pipe 2 is connected to a domestic tap water pipe, and one end of the liquid discharge valve 5 is connected to a sewer.

In this embodiment, a first liquid level sensor 6 and a second liquid level sensor 7 are further disposed in the U-shaped pipe 1, the first liquid level sensor 6 is disposed on an outer wall of an exhaust end of the U-shaped pipe 1, and the second liquid level sensor 7 is disposed on an outer wall of a bottom of the U-shaped pipe 1.

Specifically, the first liquid level sensor 6 is used for monitoring the liquid inlet level in the U-shaped pipeline 1. On one hand, the liquid supplementing limiting effect is achieved, when the liquid in the U-shaped pipeline 1 reaches the height which can be monitored by the first liquid level sensor 6, the purpose of forming a liquid seal is met, and then water adding can be stopped; on the other hand, the arrangement of the first liquid level sensor 6 can also play a role in resisting the pressure of the reverse oil smoke, and specifically comprises the following steps: when the U-shaped pipeline 1 is filled with liquid to form a seal, the pressure at two sides of the U-shaped pipeline 1 is balanced, but once the number of households using the range hood in a residential building is increased, the reverse oil smoke pressure at the side of the oil smoke main exhaust pipeline is increased, the liquid level at the exhaust end of the U-shaped pipeline 1 can be reduced under the influence of the pressure, and the sealing effect is influenced; therefore, when the liquid level is lower than the monitoring value of the first liquid level sensor 6, the liquid is replenished into the U-shaped pipeline 1, and at the moment, because of the influence of the pressure of the oil smoke total exhaust pipeline, newly-increased liquid flows to the air inlet end of the U-shaped pipeline 1, the liquid level difference between the liquid level at the air inlet end and the liquid level at the exhaust end gradually increases, namely the water level pressure difference gradually increases until the new balance is reached, and the pressure of the inverted oil smoke from the oil smoke total exhaust pipeline is resisted.

The second liquid level sensor 7 is arranged at the inner bottom of the U-shaped pipeline 1 and is used for monitoring whether liquid exists in the U-shaped pipeline 1. When the U-shaped pipeline 1 discharges the liquid completely, the range hood can be used.

In this embodiment, a communicating pipe 9 is disposed at the bottom of the U-shaped pipe 1, the U-shaped pipe 1 is connected to the liquid inlet pipe 2 and the liquid outlet pipe 3 through the communicating pipe 9, the liquid inlet valve 4 is disposed between the communicating pipe 9 and the liquid inlet pipe 2, the liquid outlet valve 5 is disposed between the communicating pipe 9 and the liquid outlet pipe 3, and the liquid inlet valve 4 and the liquid outlet valve 5 are all electric ball valves. Specifically, the communicating pipe 9 is used for communicating the liquid inlet pipe 2 and the liquid outlet pipe 3, and one communicating pipe 9 is connected with the U-shaped pipeline 1 and then connected with the liquid inlet pipe 2 and the liquid outlet pipe 3. Further, the second liquid level sensor 7 is provided on the communicating pipe 9.

In the present embodiment, the control circuit includes a current relay 11 and a power adapter 10;

the alternating current input end of the power adapter 10 is connected with alternating current, and the direct current output end of the power adapter 10 is respectively connected with the current relay 11, the first liquid level sensor 6, the second liquid level sensor 7, the liquid discharge valve 5 and the liquid inlet valve 4.

The current setting end of the current relay 11 is connected in series with the range hood power supply 12, one end of a coil of the current relay 11 and a common end of the current relay 11 are connected with the positive electrode output end of the power adapter 10, the other end of the coil of the current relay 11 is connected with the negative electrode output end of the power adapter 10, the normally closed end of the current relay 11 is connected with the positive electrode input end of the first liquid level sensor 6, and the normally open end of the current relay 11 is connected with the positive electrode input end of the second liquid level sensor 7;

the negative electrode input end of the first liquid level sensor 6 is connected with the negative electrode output end of the power adapter 10, the signal feedback end of the first liquid level sensor 6 is connected with the positive electrode input end of the liquid inlet valve 4, and the negative electrode input end of the liquid inlet valve 4 is connected with the negative electrode output end of the power adapter 10;

the negative electrode input end of the second liquid level sensor 7 is connected with the negative electrode output end of the power adapter 10, the signal feedback end of the second liquid level sensor 7 is connected with the positive electrode input end of the liquid discharge valve 5, and the negative electrode input end of the liquid discharge valve 5 is connected with the negative electrode output end of the power adapter 10.

In this embodiment, the power adapter 10 converts 220V ac power to 24V dc power and supplies power to the current relay 11, the first level sensor 6, and the second level sensor 7.

The first liquid level sensor 6 and the second liquid level sensor 7 respectively comprise a positive electrode input end, a negative electrode input end and a signal feedback end, the positive electrode input end and the negative electrode input end of the first liquid level sensor 6 are used for acquiring a power supply, the signal feedback end of the first liquid level sensor 6 feeds back an electric signal according to a monitoring liquid level signal, when the first liquid level sensor 6 detects the liquid level, the signal feedback end of the first liquid level sensor 6 is not electrified, and when the first liquid level sensor 6 does not detect the liquid level, the signal feedback end of the first liquid level sensor 6 is electrified; the positive electrode input end and the negative electrode input end of the second liquid level sensor 7 are used for acquiring a power supply, the signal feedback end of the second liquid level sensor 7 feeds back an electric signal according to a detected liquid level signal, when the second liquid level sensor 7 detects the liquid level, the signal feedback end of the second liquid level sensor 7 is electrified, and when the second liquid level sensor 7 does not detect the liquid level, the signal feedback end of the second liquid level sensor 7 is not electrified.

The drain valve 5 and the inlet valve 4 are both opened when energized and closed when not energized.

The current setting terminal of the current relay 11 is used for setting a current value, and when the current passing through the current setting terminal is larger than the set current, the coil of the current relay 11 is energized.

Specifically, the principle of controlling the U-shaped pipeline 1 to supplement liquid by the control circuit is as follows:

the negative electrode input end of the first liquid level sensor 6 is connected with the negative electrode output end of the power adapter 10, the positive electrode input end of the first liquid level sensor 6 is connected with the normally-closed end of the current relay 11, when the power supply current of the range hood monitored by the current relay 11 does not reach a set value, the coil is not electrified, the normally-closed end is connected, the first liquid level sensor 6 is electrified, the first liquid level sensor 6 performs liquid level monitoring work, when the first liquid level sensor 6 does not monitor the liquid level, the signal feedback end of the first liquid level sensor 6 is electrified, so that an electric signal is transmitted to the liquid inlet valve 4, the liquid inlet valve 4 is opened after being electrified, and liquid enters the U-shaped pipeline 1 from the liquid inlet pipe 2, and the U-shaped pipeline 1 is filled with liquid. When the range hood does not work, the coil of the current relay 11 is not electrified, namely, the U-shaped pipeline 1 is used for supplementing liquid when the range hood does not work.

The principle of controlling the liquid discharge of the U-shaped pipeline 1 by the control circuit is as follows:

the negative electrode input end of the second liquid level sensor 7 is connected with the negative electrode output end of the power adapter 10, the positive electrode input end of the second liquid level sensor 7 is connected with the normal end of the current relay 11, when the power supply current of the range hood monitored by the current relay 11 exceeds a set value, the coil is electrified and sucked, the second liquid level sensor 7 is electrified, the second liquid level sensor 7 performs liquid level monitoring work, when the second liquid level sensor 7 monitors the liquid level, the signal feedback end of the second liquid level sensor 7 is electrified, and then an electric signal is transmitted to the liquid discharge valve 5, the liquid discharge valve 5 is opened after being electrified, liquid is discharged from the U-shaped channel, and the U-shaped pipeline 1 discharges liquid. When the range hood works, the coil of the current relay 11 is electrified, so that the U-shaped pipeline 1 discharges liquid when the range hood works.

In this embodiment, the automatic water changing mechanism includes a time switch 13, a time relay 14 and a first intermediate relay 15,

the positive power input end and the signal input end of the time control switch 13 are connected with the positive output end of the power adapter 10, the negative power input end of the time control switch 13 is connected with the negative input end of the power adapter 10, and the signal output end of the time control switch 13 is connected with one end of the coil of the time relay 14;

the other end of the coil of the time relay 14 is connected with the negative electrode output end of the power adapter 10, the public end of the time relay 14 is connected with the signal output end of the time control switch 13, and the normally closed end of the time relay 14 is connected with the positive electrode input end of the second liquid level sensor 7;

one end of the first intermediate relay 15 coil is connected with the negative electrode output end of the power adapter 10, the other end of the first intermediate relay 15 coil is connected with the signal feedback end of the second liquid level sensor 7, the first common end of the first intermediate relay 15 is connected with the positive electrode output end of the power adapter 10, the first normally open end of the first intermediate relay 15 is connected with the positive electrode output end of the second liquid level sensor 7, the first normally closed end of the first intermediate relay 15 is connected with the power adapter 10, the second common end of the first intermediate relay 15 is connected with the normally closed end of the current relay 11, and the second normally closed end of the first intermediate relay 15 is connected with the positive electrode input end of the first liquid level sensor 6.

When the automatic water changing function is used, the second common end of the first intermediate relay 15 is connected with the normally closed end of the current relay 11, the normally closed end of the first intermediate relay 15 is connected with the positive electrode input end of the first liquid level sensor 6, namely, the first intermediate relay 15 is connected in series in a circuit between the normally closed end of the current relay 11 and the positive electrode input end of the first liquid level sensor 6, and in a state that the coil of the first intermediate relay 15 is not attracted, the normally closed end of the current relay 11 is always conducted with the positive electrode input end of the first liquid level sensor 6, and the first liquid level sensor 6 continuously works.

The time control switch 13 is used for setting automatic water changing time, when the preset automatic water changing time is reached, the time control switch 13 is turned on, an electric signal is transmitted to the time relay 14, and the time relay 14 is electrified.

The normally closed end of the time relay 14 is connected with the positive electrode input end of the second liquid level sensor 7 to supply power to the second liquid level sensor 7, and when the delay time set by the time relay 14 is reached, the normally closed end of the time relay 14 is automatically disconnected to stop supplying power to the second liquid level sensor 7.

Specifically, the principle of controlling automatic liquid change of the automatic liquid change mechanism is as follows:

when liquid is discharged, the following steps are carried out:

when the preset time of the time control switch 13 is reached, the time control switch 13 supplies power to the time relay 14, the time relay 14 supplies power to the second liquid level sensor 7, the second liquid level sensor 7 works, when the second liquid level monitors the liquid in the U-shaped pipeline 1, the signal feedback end of the second liquid level sensor 7 transmits an electric signal to the liquid discharge valve 5, and the liquid discharge valve 5 is opened to perform liquid discharge operation;

after the time delay of the time relay 14 is reached, the time relay 14 stops supplying power to the second liquid level relay, but because the signal feedback end of the second liquid level relay is connected with the coil of the first intermediate relay 15, when the time relay 14 stops powering off the second liquid level sensor 7, the signal feedback end of the second liquid level sensor 7 is communicated with the coil of the first intermediate relay 15, and the first intermediate relay 15 is powered on.

When the first intermediate relay 15 is electrified, the coil of the first intermediate relay 15 is electrified, the coil is attracted, and the first normal open end of the first intermediate relay 15 is attracted, so that the first normal open end of the first intermediate relay 15 supplies power to the second liquid level sensor 7, the second liquid level sensor 7 continues to work, and the liquid discharge valve 5 is controlled to perform liquid discharge operation.

When supplementing liquid, the method comprises the following steps:

when the second liquid level sensor 7 cannot monitor the liquid level, the signal feedback end of the second liquid level sensor 7 does not generate an electric signal, the coil of the first intermediate relay 15 is not electrified and is in attraction, the second normally open end of the first intermediate relay 15 is disconnected, the second normally closed end is in attraction, conduction between the current relay 11 and the first liquid level sensor 6 is realized, the first liquid level sensor 6 is electrified to work, and when the first liquid level sensor 6 cannot detect the liquid level, the first liquid level sensor controls the water inlet valve to be opened, so that liquid supplementing operation is realized.

The U-shaped pipeline 1 discharges liquid first and then supplements liquid, so that one-time automatic liquid changing operation is completed. Preventing the liquid in the U-shaped pipeline 1 from deteriorating.

In this embodiment, a third liquid level sensor 8 is further disposed in the U-shaped pipeline 1, the third liquid level sensor 8 is disposed on an outer wall of an air inlet end of the U-shaped pipeline 1, the third liquid level sensor 8 is used for monitoring the highest limit of liquid level in the U-shaped pipeline 1, an anode input end of the third liquid level sensor 8 is connected with an anode output end of the power adapter 10, a cathode input end of the third liquid level sensor 8 is connected with a cathode output end of the power adapter 10, and a signal feedback end of the third liquid level sensor 8 is connected with an anode input end of the drain valve 5.

Specifically, the third liquid level sensor 8 is powered by the power adapter 10, and the liquid level of the exhaust end in the U-shaped pipeline 1 is continuously monitored after the third liquid level sensor 8 is powered on. The signal feedback end of the third liquid level sensor 8 is electrified when the third liquid level sensor 8 detects the liquid level, namely when the third liquid level sensor 8 detects that the liquid level of the air inlet end pipeline of the U-shaped pipeline 1 is greater than the preset liquid level, the liquid discharge valve 5 is opened, and the U-shaped pipeline 1 discharges liquid.

In this embodiment, the oil fume backflow prevention device for a flue further includes an alarm mechanism, the alarm mechanism is a buzzer 17, an anode input end of the buzzer 17 is connected with a signal feedback end of the third liquid level sensor 8, and a cathode input end of the buzzer 17 is connected with a cathode output end of the power adapter 10.

The buzzer 17 is powered by the signal feedback end of the third liquid level sensor 8, and when the signal feedback end of the third liquid level sensor 8 is electrified, the buzzer 17 gives an alarm to prompt that the corresponding inspection or maintenance of the U-shaped pipeline 1 is required.

In this embodiment, a first diode 19 is connected in series between the signal feedback end of the third liquid level sensor 8 and the positive input end of the drain valve 5, and the first diode 19 is conducted from the signal feedback end of the third liquid level sensor 8 to the positive input end of the drain valve 5. The first diode 19 is in one-way conduction, the first diode 19 is arranged at the signal feedback end of the third liquid level sensor 8 and the positive electrode input end of the liquid discharge valve 5, and the buzzer 17 is prevented from being electrified to give an alarm when the signal feedback end of the second liquid level sensor 7 is conducted with the circuit of the positive electrode input end of the liquid discharge valve 5.

In this embodiment, the signal feedback end of the second liquid level sensor 7 is connected in series with the positive input end of the drain valve 5, and the second diode 20 is conducted from the signal feedback end of the second liquid level sensor 7 to the positive input end of the drain valve 5. Similarly, the second diode 20 is turned on unidirectionally, so that the coil end of the first intermediate relay 15 is prevented from being electrified to work when the signal feedback end of the third liquid level sensor 8 is turned on with the line of the positive electrode input end of the liquid discharge valve 5.

In this embodiment, a third diode 21 is connected in series between the normally closed end of the time relay 14 and the positive input end of the second liquid level sensor 7, and the third diode 21 is conducted from the normally closed end of the time relay 14 to the positive input end of the second liquid level sensor 7. The third diode 21 is turned on unidirectionally, preventing the time relay 14 from being forced to be energized when energized by the first intermediate relay 15 or the current relay 11.

In this embodiment, the oil smoke prevention backflow device for the flue further comprises an anti-freezing mechanism, the anti-freezing mechanism is used for controlling the liquid in the U-shaped pipeline 1 to flow, the anti-freezing mechanism comprises a second intermediate relay 16 and a double-control switch 18, one end of a coil of the second intermediate relay 16 is connected with a signal feedback end of the first liquid level sensor 6 through the double-control switch 18, the other end of the coil of the second intermediate relay 16 is connected with a negative electrode output end of the power adapter 10, a public end of the second intermediate relay 16 is connected with an anode output end of the power adapter 10 through the double-control switch 18, and a normally closed end of the second intermediate relay 16 is connected with an anode input end of the liquid discharge valve 5.

In cold winter, under the condition that the range hood is not used for a long time, the liquid in the U-shaped pipeline 1 can freeze the U-shaped pipeline 1 to influence the use of the U-shaped pipeline 1, so the range hood also has an antifreezing function. The user presses the double control switch 18 to activate the anti-freeze mechanism.

The coil of the second intermediate relay 16 is connected with the first liquid level sensor 6, and the normally closed end of the second intermediate relay 16 is connected with the positive electrode input end of the liquid discharge valve 5.

Specifically, the principle of the anti-freezing mechanism is as follows:

when the double control switch 18 is pressed, the signal feedback end of the first liquid level sensor 6 is conducted with the coil of the second intermediate relay 16, and the common end of the second intermediate relay 16 is conducted with the positive output end of the power adapter 10.

When the first liquid level sensor 6 detects the liquid level, the signal feedback end of the first liquid level sensor 6 is unpowered, the normally-closed end of the second intermediate relay 16 transmits an electric signal to the positive input end of the liquid discharge valve 5, and the liquid discharge valve 5 is opened to perform liquid discharge operation;

when the first liquid level sensor 6 cannot monitor the liquid level, the signal feedback end of the first liquid level sensor 6 is electrified, the coil of the second intermediate relay 16 is electrified, the normally closed end is disconnected, the liquid discharge valve 5 cannot receive an electric signal and is closed to stop liquid discharge, the signal feedback end of the first liquid level sensor 6 inputs the electric signal to the positive input end of the liquid inlet valve 4, the liquid inlet valve 4 works, liquid is replenished to the U-shaped pipeline 1 until the first liquid level sensor 6 monitors the liquid level again, and the operation is circulated.

Further, the operations of the liquid discharge valve 5 and the liquid inlet valve 4 in this embodiment have a certain time delay, and a certain time is required from the disconnection to the complete disconnection; similarly, a certain time is also provided for closing and completely closing, and when the liquid discharge valve 5 is in the process of opening, completely opening, closing and completely closing, and the liquid inlet valve 4 is in the process of opening, completely opening, closing and completely closing, a certain liquid level difference can be formed, so that the effect of liquid flowing in the U-shaped pipeline 1 is achieved. Thereby realizing the antifreezing function.

It is worth noting that when the anti-freezing function is used, the liquid level after liquid drainage cannot be lower than the liquid level for realizing the sealing effect, and the sealing of the U-shaped pipeline 1 is ensured.

Due to the limitation of unidirectional conduction of the first diode 19 and the second diode 20, the electrical signal at the normally closed end of the second intermediate relay 16 will only reach the positive input end of the drain valve 5.

In other embodiments of the present utility model, other thermal measures may be taken with respect to the U-shaped tube to achieve the freeze protection function, including, but not limited to, applying a thermal coating, externally provided thermal sleeves, and the like.

In a second aspect, an embodiment of the utility model provides a range hood, which comprises the oil smoke prevention backflow device for a flue.

The foregoing details of the optional implementation of the embodiment of the present utility model have been described in detail with reference to the accompanying drawings, but the embodiment of the present utility model is not limited to the specific details of the foregoing implementation, and various simple modifications may be made to the technical solution of the embodiment of the present utility model within the scope of the technical concept of the embodiment of the present utility model, and these simple modifications all fall within the protection scope of the embodiment of the present utility model.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations of embodiments of the present utility model are not described in detail.

Those skilled in the art will appreciate that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program stored in a storage medium, including instructions for causing a single-chip microcomputer, chip or processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In addition, any combination of various embodiments of the present utility model may be performed, so long as the concept of the embodiments of the present utility model is not violated, and the disclosure of the embodiments of the present utility model should also be considered.

Claims (10)

1. An oil smoke resistant reverse flow device for a flue, comprising:

the exhaust pipe comprises a U-shaped pipeline (1), wherein the air inlet end of the U-shaped pipeline (1) is connected with an exhaust pipe of the range hood, and the exhaust end of the U-shaped pipeline (1) is connected with an exhaust manifold;

the liquid inlet pipe (2), the liquid inlet pipe (2) is arranged at the bottom of the U-shaped pipeline (1) and is communicated with the inside of the U-shaped pipeline (1) through the liquid inlet end of the U-shaped pipeline (1), and a liquid inlet valve (4) is arranged on a liquid inlet pipeline of the liquid inlet pipe (2);

the liquid discharge pipe (3) is arranged at the bottom of the U-shaped pipeline (1) and is communicated with the inside of the U-shaped pipeline (1) through a liquid discharge end of the U-shaped pipeline (1), and a liquid discharge valve (5) is arranged on the liquid discharge pipe of the liquid discharge pipe (3);

the automatic water changing mechanism is respectively and electrically connected with the liquid inlet valve (4) and the liquid discharge valve (5) and is used for controlling the opening and closing of the liquid inlet valve (4) and the liquid discharge valve (5);

the control circuit is respectively and electrically connected with the liquid inlet valve (4), the liquid discharge valve (5) and the automatic water changing mechanism and is used for controlling the liquid inlet valve (4), the liquid discharge valve (5) and the automatic water changing mechanism to work.

2. The oil smoke prevention backflow device for the flue according to claim 1, wherein a first liquid level sensor (6) and a second liquid level sensor (7) are further arranged in the U-shaped pipeline (1), the first liquid level sensor (6) is arranged on the outer wall of the exhaust end of the U-shaped pipeline (1), and the second liquid level sensor (7) is arranged on the outer wall of the bottom of the U-shaped pipeline (1).

3. The fume backflow prevention device for a flue according to claim 2, wherein the control circuit comprises a current relay (11) and a power adapter (10);

the alternating current input end of the power adapter (10) is connected with alternating current, and the direct current output end of the power adapter (10) is respectively connected with the current relay (11), the first liquid level sensor (6), the second liquid level sensor (7), the liquid discharge valve (5) and the liquid inlet valve (4);

the current setting end of the current relay (11) is connected in series with a range hood power supply (12), one end of a coil of the current relay (11) and a public end of the current relay (11) are connected with the positive electrode output end of the power adapter (10), the other end of the coil of the current relay (11) is connected with the negative electrode output end of the power adapter (10), the normally closed end of the current relay (11) is connected with the positive electrode input end of the first liquid level sensor (6), and the normally open end of the current relay (11) is connected with the positive electrode input end of the second liquid level sensor (7);

the negative electrode input end of the first liquid level sensor (6) is connected with the negative electrode output end of the power adapter (10), the signal feedback end of the first liquid level sensor (6) is connected with the positive electrode input end of the liquid inlet valve (4), and the negative electrode input end of the liquid inlet valve (4) is connected with the negative electrode output end of the power adapter (10);

the negative electrode input end of the second liquid level sensor (7) is connected with the negative electrode output end of the power adapter (10), the signal feedback end of the second liquid level sensor (7) is connected with the positive electrode input end of the liquid discharge valve (5), and the negative electrode input end of the liquid discharge valve (5) is connected with the negative electrode output end of the power adapter (10).

4. A flue oil smoke prevention backward flow apparatus according to claim 3, wherein said automatic water change mechanism comprises a time switch (13), a time relay (14) and a first intermediate relay (15);

the positive electrode input end and the signal input end of the power supply of the time control switch (13) are connected with the positive electrode output end of the power supply adapter (10), the negative electrode input end of the power supply of the time control switch (13) is connected with the negative electrode output end of the power supply adapter (10), and the signal output end of the time control switch (13) is connected with one end of the coil of the time relay (14);

the other end of the coil of the time relay (14) is connected with the negative electrode output end of the power adapter (10), the public end of the time relay (14) is connected with the signal output end of the time control switch (13), and the normally closed end of the time relay (14) is connected with the positive electrode input end of the second liquid level sensor (7);

the negative pole output of power adapter (10) is connected to one end of first intermediate relay (15) coil, the other end of first intermediate relay (15) coil is connected the signal feedback end of second level sensor (7), the first common end of first intermediate relay (15) is connected the positive pole output of power adapter (10), the first open end of first intermediate relay (15) is connected the positive pole input of second level sensor (7), the first normal close end of first intermediate relay (15) is connected power adapter (10), the second common end of first intermediate relay (15) is connected the normal close end of current relay (11), the second normal close end of first intermediate relay (15) is connected the positive pole input of first level sensor (6).

5. The oil smoke prevention backflow device for a flue according to claim 4, wherein a third liquid level sensor (8) is further arranged in the U-shaped pipeline (1), the third liquid level sensor (8) is arranged on the outer wall of the air inlet end of the U-shaped pipeline (1), the third liquid level sensor (8) is used for monitoring the highest limit of the liquid level in the U-shaped pipeline (1), the positive electrode input end of the third liquid level sensor (8) is connected with the positive electrode output end of the power adapter (10), the negative electrode input end of the third liquid level sensor (8) is connected with the negative electrode output end of the power adapter (10), and the signal feedback end of the third liquid level sensor (8) is connected with the positive electrode input end of the liquid discharge valve (5).

6. The oil smoke preventing backflow device for the flue according to claim 5, further comprising an alarm mechanism, wherein the alarm mechanism is a buzzer (17), the positive electrode input end of the buzzer (17) is connected with the signal feedback end of the third liquid level sensor (8), and the negative electrode input end of the buzzer (17) is connected with the negative electrode output end of the power adapter (10).

7. The oil smoke prevention backward flow device for the flue according to claim 5, wherein a first diode (19) is connected in series between the signal feedback end of the third liquid level sensor (8) and the positive electrode input end of the liquid discharge valve (5), and the first diode (19) is conducted from the signal feedback end of the third liquid level sensor (8) to the positive electrode input end of the liquid discharge valve (5).

8. The oil smoke prevention backward flow device for the flue according to claim 5, wherein a second diode (20) is connected in series with the signal feedback end of the second liquid level sensor (7) and the positive electrode input end of the liquid discharge valve (5), and the second diode (20) is conducted from the signal feedback end of the second liquid level sensor (7) to the positive electrode input end of the liquid discharge valve (5).

9. A smoke and oil resistant backflow device for a flue according to claim 3, further comprising an anti-freezing mechanism, wherein the anti-freezing mechanism is used for controlling liquid flow in the U-shaped pipeline (1), the anti-freezing mechanism comprises a second intermediate relay (16) and a double-control switch (18), one end of a coil of the second intermediate relay (16) is connected with a signal feedback end of the first liquid level sensor (6) through the double-control switch (18), the other end of the coil of the second intermediate relay (16) is connected with a negative electrode output end of the power adapter (10), a public end of the second intermediate relay (16) is connected with a positive electrode output end of the power adapter (10) through the double-control switch (18), and a normally closed end of the second intermediate relay (16) is connected with a positive electrode input end of the liquid discharge valve (5).

10. A range hood comprising the oil smoke prevention backflow device for a flue according to any one of claims 1 to 9.

Images